PIVOTAL SLEIGH SHOVEL

TECHNICAL FIELD

The present application generally relates to shovels, and more specifically to sleigh shovels adapted to facilitate the offloading of materials.

BACKGROUND

Shoveling snow can be a tedious, lengthy and tiresome task. Over the years, new shovel designs have been sold on the market to facilitate this task by reducing the risk of injury and minimizing the time needed to shovel a certain amount of snow. For example, sleigh-type shovels were developed to allow a user to haul larger volumes of snow with each shovel.

However, unloading these large hauls of snow often requires the scoop of the shovel to be flipped/tipped over to empty its contents. Large hauls of snow can be quite heavy and thus tipping over a sleigh shovel full of snow can be just as tedious and tiring as shoveling by hand with a regular shovel.

Therefore, there is a need for an improved sleigh shovel able to overcome at least some of these shortcomings.

SUMMARY

According to an aspect, a pivotal sleigh shovel is provided. The shovel includes a push bar assembly having an upper end and a lower end opposite the upper end; a sleigh pivotally connected to the lower end of the push bar assembly, the sleigh having side panels and a bottom panel extending between the side panels; a discharge mechanism mounted to the push bar assembly for moving the sleigh between a loading configuration for containing and transporting material within the sleigh, and a discharging configuration in which the sleigh is upwardly angled relative to the loading configuration for discharging the material, the discharge mechanism comprising: a rotatable handle pivotally connected to the push bar assembly about a first pivoting axis, the rotatable handle being movable along a rotating path between a first position and a second position to generate an input rotation; a lever pivotally connected to the push par assembly about a second pivoting axis, the lever having a load end configured to apply an upward force on the bottom panel of the sleigh upon rotation of the lever, to raise the sleigh towards the loading configuration; and a transmission assembly configured to transfer the input rotation to the lever, the transmission assembly being tuned to divide the input rotation during a first segment of the rotating path, and to multiply the rotation during a second segment of the rotating path.

According to a possible embodiment, when in the loading configuration, the sleigh rests on the push bar assembly, and in the discharging configuration the sleigh is pivotally rotated away from the push bar assembly.

According to a possible embodiment, the bottom panel has a substantially planar bottom surface, further wherein in the loading configuration, the bottom surface of the bottom panel is substantially parallel to the ground, and in the discharging configuration the sleigh is pivoted so that an angle of inclination between the ground and the bottom surface of the bottom panel is between 0° and 90°.

According to a possible embodiment, the push bar assembly comprises spaced-apart longitudinal members and a transversal member extending between the longitudinal members at the upper end of the push bar assembly, each side panel of the sleigh being pivotally connected to a corresponding one of the longitudinal members at the lower end of the push bar assembly.

According to a possible embodiment, the rotatable handle comprises spaced-apart longitudinal members and a transversal member extending between the longitudinal members, wherein in the first position, the longitudinal members are oriented substantially perpendicular to the longitudinal members of the push bar assembly, and in the second position the longitudinal members of the handle are oriented substantially parallel with the longitudinal members of the push bar assembly.

According to a possible embodiment, the sleigh further comprises fins extending outwardly from the side panels and wherein the fin of each side panel rests on its corresponding one of the longitudinal members when the sleigh is in the loading configuration.

According to a possible embodiment, the transmission assembly comprises: a proximal shaft secured to the rotatable handle and extending between the longitudinal members along the first pivoting axis; a distal shaft secured to the lever and extending between the longitudinal members along the second pivoting axis; a proximal cam secured to the proximal shaft; a distal cam secured to the distal shaft; and a connecting rod having a first end pivotally connected to the proximal cam and a second end pivotally connected to the distal cam; wherein in the loading configuration, the proximal cam is oriented substantially parallel to a lengthwise axis extending between the upper end and the lower end of the pushbar assembly, and the distal cam is oriented substantially perpendicular to the lengthwise axis; and wherein in the discharging configuration, the proximal cam is oriented substantially perpendicular to the lengthwise axis.

According to a possible embodiment, the discharge mechanism comprises stoppers positioned to limit over-rotation of the rotatable handle when moving from the second position to the first position, further wherein in the loading configuration, a vector pointing from the second end of the connecting rod to the first end of the connecting rod points below the first pivoting axis.

According to a possible embodiment, the first pivoting axis is positioned proximate to the upper end of the push bar assembly, the second pivoting axis is positioned at an intermediate position between the upper end and lower end of the push bar assembly, and the sleigh is pivotally connected to the push bar assembly at a third pivoting axis positioned at the lower end of the push bar assembly.

According to a possible embodiment, the pivotal sleigh shovel further comprises a locking mechanism, the locking mechanism being operable between a lock configuration and a release configuration, wherein in the lock configuration the locking mechanism prevents rotation of the sleigh while in the loading configuration, and in the release configuration the locking mechanism is disengaged, thereby allowing the sleigh to rotate towards the discharging configuration.

According to a possible embodiment, the locking mechanism comprises a latch mounted on the push bar assembly, a locking bolt mounted on the sleigh and positioned to engage in the latch when the sleigh is in the loading configuration, and an actuator operable to release the latch to allow the locking bolt to be disengaged from the latch.

According to a possible embodiment, the actuator comprises an unlocking lever at least partially mounted to the rotatable handle, and a cable operatively connecting the unlocking lever to the latch.

According to a possible embodiment, the load end of the lever comprises wheels configured to abut and roll against the bottom panel of the sleigh.

According to a possible embodiment, in the loading configuration the wheels are coplanar with the bottom panel of the sleigh.

According to a possible embodiment, the bottom panel of the sleigh comprises a rear section, a bottom section, and a curved mid-section extending between the bottom section and the rear section, the wheels being positioned to roll against the curved mid-section of the bottom panel while pivoting the sleigh between the loading configuration and the discharging configuration.

According to a possible embodiment, the load end of the lever comprises a pair of spaced-apart wheels.

According to a possible embodiment, the lever is substantially J-shaped.

According to another aspect, a pivotal sleigh shovel is provided. The shovel includes a push bar assembly having an upper end and a lower end opposite to the upper end; a sleigh pivotally connected at the lower end of the push bar assembly for containing material; a discharge mechanism mounted to the push bar assembly, the discharge mechanism comprising: a rotatable handle operable to generate an input rotation; a lever pivotally connected to the push par assembly; and a transmission assembly operatively connecting the rotatable handle and the lever, to transfer the input rotation generated by the handle to the lever; wherein the discharge mechanism is adapted to pivotally rotate the sleigh away from the push bar assembly to discharge the sleigh upon operation of the rotatable handle.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a pivotal sleigh shovel having a sleigh, a push bar assembly and a discharge mechanism, according to an embodiment.

FIG. 2 is a rear perspective view of the pivotal sleigh shovel as shown in FIG. 1, showing a lever pivotally connected to the push bar assembly, according to an embodiment.

FIG. 3 is a front view of the pivotal sleigh shovel as shown in FIG. 1, showing a sleigh of the pivotal sleigh shovel, according to an embodiment.

FIG. 3A is an enlarged view of a portion of the pivotal sleigh shovel shown in FIG. 3, showing the pivotable connection between the sleigh and the push bar assembly, according to an embodiment.

FIG. 4 is a perspective view of the pivotal sleigh shovel shown in FIG. 1, showing connections between components of the discharge mechanism, according to an embodiment.

FIG. 5 is a rear view of the pivotal sleigh shovel shown in FIG. 1, showing a handle operatively coupled to the lever, according to an embodiment.

FIG. 5A is an enlarged view of a portion of the pivotal sleigh shovel shown in FIG. 5, showing a locking mechanism for preventing rotation of the sleigh, according to an embodiment.

FIG. 5B is an enlarged front perspective view of the locking mechanism shown in FIG. 5A.

FIG. 6 is a side view of the pivotal sleigh shovel shown in FIG. 1, showing the pivotal sleigh shovel in a loading configuration, and with the locking mechanism in a locked configuration, according to an embodiment.

FIG. 7 is a side view of the pivotal sleigh shovel illustrated in FIG. 1, showing the pivotal sleigh shovel in a loading configuration, and with the locking mechanism in a released configuration, according to an embodiment.

FIG. 8 is a side view of the pivotal sleigh shovel shown in FIG. 1, showing the pivotal sleigh shovel in a discharge configuration, according to an embodiment.

FIG. 9 is a graph showing a relation between the discharge angle of the sleigh and the discharge angle of the lever, for different discharge mechanisms, according to possible embodiments.

FIG. 10 is a perspective view of an alternative embodiment of the pivotal sleigh shovel shown in FIG. 1, showing an electric actuator for operating the pivotal sleigh shovel between the loading and discharge configurations.

FIG. 11 is a rear perspective view of the pivotal sleigh shovel as shown in FIG. 10, showing a lever pivotally connected to the push bar assembly, according to the alternate embodiment.

FIG. 12 is a rear view of the pivotal sleigh shovel shown in FIG. 10, showing a handle operatively coupled to the lever, according to an embodiment.

FIG. 13 is a front view of the pivotal sleigh shovel as shown in FIG. 10, showing a sleigh of the pivotal sleigh shovel, according to an embodiment.

FIG. 14 is an enlarged view of a portion of the pivotal sleigh shovel shown in FIG. 10, showing a gear box assembly of the electric actuator, according to an embodiment.

FIG. 15 is rear view of a portion of the electric actuator, showing a rotatable handle coupled to an electric switch, according to an embodiment.

FIG. 16 is an enlarged view of a portion of the gear box assembly shown in FIG. 14, showing a motorized transmission assembly in an idle configuration, according to an embodiment.

FIG. 17 is an enlarged view of a portion of the gear box assembly shown in FIG. 14, showing a motorized transmission assembly in an actuated configuration, according to an embodiment.

FIG. 18 is a side view of the pivotal sleigh shovel shown in FIG. 10, showing the pivotal sleigh shovel in a loading configuration, according to an embodiment.

FIG. 19 is a side view of the pivotal sleigh shovel shown in FIG. 10, showing the pivotal sleigh shovel in a discharge configuration, according to an embodiment.

DETAILED DESCRIPTION

As will be explained below in relation to various embodiments, a pivotal sleigh shovel for shoveling and discharging snow, or other material, is provided. Typical sleigh shovels include a scoop and a push bar connected to the sleigh for handling thereof. It should be understood that, as used herein, the expression “sleigh” refers to the part of the shovel adapted to contain the material to be shoveled. Other expressions such as “bucket” and/or “scoop” can also be used to refer to the same element. It should also be understood that the material to be shoveled can be any suitable material which can be contained, transported, pushed, displaced, etc. by a shovel, and is thus not limited to snow and/or sand. However, for simplicity and clarity, snow will be used as the main example of “material to be shoveled” throughout this disclosure. In addition, the pivotal sleigh shovel described herein includes a discharge mechanism operable to effectively discharge the sleigh of its content as will be described below.

Referring to FIGS. 1 to 3, an embodiment of a pivotal sleigh shovel 10, hereinafter simply referred to as “shovel” 10, is illustrated. The shovel 10 is adapted to receive, contain, transport and discharge materials, such as snow or sand. In this embodiment, the shovel 10 includes a push bar assembly 150, a sleigh 100 pivotally connected to the push bar assembly 150, and a discharge mechanism 200 operatively coupled to the push bar assembly and operable to displace the sleigh 100. In some embodiments, the discharge mechanism 200 is configured to operate the sleigh 100 between a loading configuration where the sleigh 100 can at least partially be filled with material (e.g., snow) and a discharging configuration where the material within the sleigh 100 is unloadable/dischargeable.

The push bar assembly 150 is adapted to facilitate the handling of the sleigh 100. In this embodiment, the push bar assembly 150 has an upper end 160 and a lower end 170 opposite to the upper end 160. The push bar assembly 150 extends along a lengthwise axis (L) between each end 160, 170. The push bar assembly 150 includes a pair of spaced-apart longitudinal members 154, each extending from the upper end 160 towards the lower end 170. The longitudinal members 154 are each respectively connected to a transversal member 152 extending therebetween at the upper end 160, thereby forming an arch-like arrangement. In this embodiment, the push bar assembly is made of various materials. For example, the transversal member 152 and a portion of the longitudinal members 154 can be made of metal, while other portions of the longitudinal members 154 can be made of plastic. The plastic portion can include the portion of the longitudinal members 154 in contact with the sleigh 100, e.g., on which the sleigh rests. In some embodiments, shafts 312, 322 (seen in FIG. 3) are connected to the longitudinal members 154 along the metal portions thereof to enable connection of the discharge mechanism 300 and to strengthen the structure of the push bar assembly 150.

In some embodiments, the push bar assembly 150 can be made entirely of the same material, such as steel, plastic, or any other suitable material. In some embodiments, the push bar assembly 150 can also be made of a single piece, such as via a molding and/or machining process, or multiple pieces connected together, although other processes and methods are also possible.

In this embodiment, the sleigh 100 includes spaced apart side panels 110 connected to one another via a bottom panel 114 extending therebetween. The side panels 110 are substantially parallel with respect to each other, although other configurations are possible (e.g., angled side panels). The side panels 110 and the bottom panel 114 are adapted to cooperate to define a volume for containing and a front portion 102, opposite to the back portion 104, and a front opening 106 at the front portion 102 where the front opening is defined by the front portion 102. It should be understood that the shoveled material can enter the volume of the sleigh by the front opening 106.

Still referring to FIGS. 1 to 3, in this embodiment, the side panels 110 define a 90-degree angle with respect to the bottom panel 114. However, it is appreciated that, in other embodiments, the side panels 110 can be angled away from the bottom panel 114 and extend at any suitable angle (e.g., 45 degrees, 60 degrees, 120 degrees, etc.). The bottom panel 114 is curved along a length between the top and bottom edges. To define the curve, the bottom panel 114 can be separated into sections, including a bottom section 116, a rear section 115, and a mid-section 117 extending between the bottom 116 and rear 115 sections. As shown in FIG. 1, the mid-section 117 is substantially curved, thereby giving the bottom panel 114 a curved shape. The bottom section 116 and the rear section 115 each have a substantially planar or “flat” surface. The bottom section and the rear section can be substantially perpendicular relative to each other. In other words, rear and bottom sections 115, 116 can each define respective planes that form an angle of approximately 90-degrees relative to one another. At rest, the bottom section 116 is substantially parallel to the ground, while the rear section 115 is substantially perpendicular thereto. In some embodiments, the bottom section 116 and the rear section 115 can also be curved, giving a more pronounced curvature to the bottom panel 114.

The sleigh 100 can be pivotally connected to the push bar assembly 150 proximate the lower end 170. In this embodiment, the sleigh 100 is adapted to pivot about a pivoting axis 240 extending perpendicularly relative to the longitudinal members 154 and substantially parallel to the transversal member 152. It should be understood that pivotally connecting the sleigh 100 and the push bar assembly 150 allows the sleigh to rotate about the pivoting axis 240, towards and/or away from the push bar assembly 150. In this embodiment, the sleigh 100 is pivotally connected to push bar assembly 150 via side panels 110. As shown in FIG. 3A, each longitudinal member 154 is connected to respective side panels 110 via respective revolute joints 158. It is noted that the connection axis of each revolute joint 158 is substantially collinear with the pivoting axis 240. The revolute joints 158 include a combination of bolts and washers extending between the side panels 110 and the longitudinal members 154, thereby maintaining the sleigh 100 pivotally connected thereto. However, it is appreciated that other configurations are possible and may be implemented to pivotally connect the sleigh to the push bar assembly.

In some embodiments, the side panels 110 can be provided with respective fins 111 extending outwardly therefrom. For instance, the fins 111 can extend from a top edge of the side panel 110 and are shaped to rest or abut on the longitudinal member 154. In some embodiments, the bottom panel 114 can similarly be provided with a second fin 113 extending from a top edge thereof. The fins 111,113 are adapted to limit the rotation of the sleigh 100 with respect to the push bar assembly 150, for example, by preventing the sleigh 100 from falling between the longitudinal members 154. In other words, in this embodiment, while in the loading configuration, the fins 111, 113 are adapted to rest upon the structure of the push bar assembly.

Now referring to FIGS. 1 to 4, the pivotal sleigh shovel 10 further includes a discharge mechanism 200 coupled to the push bar assembly 150. The discharge mechanism 200 is configured to operate the sleigh 100, e.g., for discharging or emptying the sleigh of its content. In this embodiment, the discharge mechanism 200 is manually operable. For example, the discharge mechanism can be operated using an input force provided by a user operating the shovel 10. However, it can be appreciated that in other embodiments, the input force can be provided by a machine, such as a motor, and/or by a combination of the user and the machine.

In this embodiment, the discharge mechanism 200 includes a rotatable handle 400 (hereinafter referred to as the handle 400), pivotally connected to the push bar assembly 150 about a pivoting axis 440. The pivoting axis 440 can be generally perpendicular to the longitudinal members 154 and substantially parallel to the transversal member 152 of the push bar assembly 150. The handle 400 has a top end 406 and a bottom end 408 opposite to the top end 406. The handle 400 is pivotally connected to the push bar assembly 150 proximate the bottom end 408, such that the top end 406 is allowed to move toward and away from the push bar assembly 150 upon operation of the handle 400 (e.g., upon rotation of the handle about the pivoting axis 440). In this embodiment, the bottom end 408 is connected to a shaft 312, also herein referred to as a proximal shaft, mounted and extending between the longitudinal members 154. As such, the shaft 312 is adapted to rotate together with the handle upon rotation thereof about the pivoting axis 440.

In this embodiment, the handle 400 further includes a pair of spaced apart longitudinal members 404 respectively extending between the bottom end 408 and the top end 406. The longitudinal members 404 are each secured to opposite ends of the proximal shaft 312, adjacent to respective longitudinal members 154. The longitudinal members 404 of the handle are connected to a transversal member 402 extending therebetween proximate the top end 406, thereby forming an arch-like arrangement. In some embodiments, the handle 400 can be made of metal or plastic, or any other suitable material or combination thereof. In some embodiments, the handle 400 can be made of a single piece or multiple pieces via a molding and/or machining process, although other configurations are also possible.

In some embodiments, the discharging mechanism 200 further includes a lever mechanism 500 adapted to apply an upward force on the sleigh 100 upon operation of the handle 400. It should be noted that applying an upward force can involve the lever mechanism 500 being operated to upwardly engage, or upwardly push, the sleigh 100 so as to pivot the sleigh 100 about the pivoting axis 240 and away from the push bar assembly 150. In this embodiment, the lever mechanism 500 is pivotally connected to the push bar assembly 150 about a pivoting axis 540. The pivoting axis 540 is perpendicular to the longitudinal members 154 and substantially parallel to the transversal member 152 of the push bar assembly 150. In this embodiment, the lever mechanism 500 has a pivoting end 512 and a load end 510 opposite to the pivoting end 512. The pivoting end 512 is pivotally connected to the push bar assembly 150 such that the load end 510 is adapted to move towards and away from the sleigh 100 and the push bar assembly 150 as the lever mechanism 500 rotates about the pivoting axis 540. In this embodiment, the pivoting end 512 is connected to a shaft 322, also herein referred to as the distal shaft, extending between the longitudinal members 154 of the push bar assembly 150, such that the pivoting end 512 and the shaft 322 rotate together about the pivoting axis 540 as the lever mechanism 500 is operated (e.g., rotated). The load end 510 can be provided with an abutment member adapted for contacting the sleigh 100 and transferring the upward force thereto. In this embodiment, the abutment member includes a pair of wheels 504 spaced-apart from one another. It should be noted that other embodiments are possible, where a single wheel or more wheels 504 (e.g., more than two) can be provided at the load end 510, and/or where different abutment members can be provided.

In this embodiment, the pair of wheels 504 are connected to respective pairs of arms 502 extending between the pivoting end 512 and the load end 510. Each pair of arms 502 is connected to and extends from the distal shaft 322. It should be noted that the length of each pair of arms 502 can allow the wheels 504 to engage the mid-section 117 of the sleigh 100, although other configurations are possible. In this embodiment, a portion of the arms 502 is curved, giving the lever mechanism 500 a substantially J-shape. In some embodiments, the lever mechanism 500 can further include supporting members 506, 508, adapted to mechanically reinforce the arms 502 and/or hold the pairs of arms 502 together. In this embodiment, the lever mechanism includes first and second supporting members 506, 508 extending perpendicularly between the arms 502 of a given pair. As shown in FIG. 2, the first support member 506 secures the two pairs of arms 502 together, while the second support members 508 secure respective pairs of arms 502 together.

Still referring to FIGS. 1 to 4, the discharge mechanism 200 includes a transmission assembly 300 configured to transfer an input rotation generated by the handle 400 to the lever mechanism 500. In this embodiment, the transmission assembly 300 is pivotally connected between the handle 400 and the lever mechanism 500 for transferring the input rotation. The transmission assembly 300 extends along the lengthwise axis (L) between the pivoting axes 440, 540. More specifically, the transmission assembly 300 includes a connecting rod 330 connected to the proximal shaft 312 at a proximal end 310 of the transmission assembly, and to the distal shaft 322 at a distal end 320 of the transmission assembly. The connecting rod 330 extends between the shafts 312, 322 along the lengthwise axis (L).

In this embodiment, the connecting rod 330 is substantially straight, but it can be appreciated that the shape of the connecting rod 330 can vary in other embodiments. For example, the connecting rod can have a curved or waved shaped. In this embodiment, the connecting rod 330 extends along a length between a first end 332 and a second end 334. The connecting rod 330 is pivotally connected to a proximal cam 336 at the first end 332 and to a distal cam 338 at the second end 334, opposite to the first end 332. The proximal cam 336 extends between and is connected to the proximal shaft 312 and the first end 332 of the connecting rod 330. Similarly, the distal cam 338 extends between and is connected to the distal shaft 322 and the second end 334 of the connecting rod 330. In this embodiment each cam 336, 338 are substantially centrally positioned on their corresponding shaft 312, 322, although other configurations are possible. It should also be noted that the transmission assembly 300 can include additional connecting rods 330 and/or cams 336, 338. For example, in some embodiments, two spaced-apart pairs of connecting rods and cams can be positioned between shafts 312, 322. Moreover, it is appreciated that other types of transmission assemblies can be provided to transfer the input rotation generated by the handle 400 to the lever mechanism 500.

Referring to FIGS. 5, 5A and 5B, in addition to FIG. 1, the shovel 10 can further include a locking mechanism 600 operable to prevent rotation of the sleigh 100. In this embodiment, the locking mechanism 600 includes a latch 610, such as a rotary latch, mounted to the push bar assembly 150. The latch 610 is mounted on one of the longitudinal members 154 and is positioned to engage a locking bolt 608 mounted on the sleigh 100. In this embodiment, the locking bolt 608 is connected to an extends from the fin 113 at the upper edge of the bottom panel 114. The locking bolt is adapted to engage the latch 610. In some embodiments, the latch 610 can include an aperture to receive the locking bolt 608 and a teeth assembly to engage the bolt 608. For example, as shown in FIG. 5B, the teeth assembly can include a pair of fixed upper teeth 614 and a lower tooth 612 adapted to pivot closer to and away from the aperture.

In this embodiment, the locking mechanism 600 further includes an actuator 601 adapted to operate the latch 610 (e.g., to open and close the teeth assembly). The actuator 601 includes an unlocking lever 602 in the form of a rotatable handle coupled to the handle 400. The unlocking lever 602 extends between the longitudinal members 404 and is positioned substantially parallel to the transversal member 402. The actuator 601 further includes a cable 604 operatively connecting the unlocking lever 602 to the latch 610 and enabling transmission of an actuation force generated by the unlocking lever 602 to the latch 610. Similar to the handle 400, the unlocking lever 602 can be manually operated to rotate about a pivot.

Now with reference to FIGS. 6 to 8, operation of the shovel 10 between the loading configuration and the discharging configuration will be described.

In this embodiment, the sleigh 100 is operatively connected to the discharge mechanism 200, and a manual operation of the handle 400 (e.g., pulling or releasing the handle 400) moves (e.g., rotates) the sleigh 100 between the loading configuration 120, where the material can be contained and moved (shown in FIGS. 6, 7 and 18), and the discharging configuration 130 where the material is effectively discharged (shown in FIGS. 8 and 19). In some embodiments, when the sleigh 100 is in the loading configuration 120, the sleigh 100 rests on the push bar assembly 150. More specifically, the fins extending from each side of the side panels rest on their corresponding longitudinal member. In this embodiment, while the sleigh 100 is in the loading configuration 120, the bottom panel of the sleigh is positioned between the longitudinal members 154. Therefore, the bottom surface of the bottom panel is substantially parallel to the ground, while the rear panel is substantially perpendicular to the ground.

In the discharging configuration 130, the bottom panel of the sleigh 100 is upwardly angled relative to the ground. In some embodiments, while in the discharging configuration 130, the sleigh 100 is pivoted away from the push bar assembly 150 about the pivoting axis 240. For instance, while moving towards the discharging configuration 130, the sleigh 100 is pivoted so that the bottom surface of the bottom panel is angled about an inclination angle (θ) relative to the ground (shown in FIG. 8). The inclination angle (θ) can be between 0 and 90 degrees, such as between 10 and 80 degrees, such as between 25 and 60 degrees, for example. It should be noted that other suitable inclination angles (θ) can be considered to effectively discharge the sleigh 100.

The transition between the loading and the discharging configuration 120, 130 of the sleigh 100 is initiated via actuation of the handle 400. In some embodiments, the handle 400 is manually actuated and moved between a first position 420 (FIGS. 6 and 7) and a second position 422 (FIG. 8) along a rotating path 430. The term “rotating path” herein refers to the path traveled between the first position 420 and the second position 422 upon actuation of the handle 400 about its corresponding pivoting axis 440. In the first position 420, the handle 400 is substantially perpendicular with respect to the lengthwise axis (L), as seen, for example, in FIG. 6. In the second position 422, the handle 400 is substantially parallel with respect to the lengthwise axis (L), as seen, for example, in FIG. 8. Accordingly, the longitudinal members and the transversal member of the handle 400 are oriented substantially parallel with respect to their corresponding longitudinal members and transversal member of the push bar assembly 150. It should also be noted that, in the second position 422, the transversal member is also located under the transversal member of the push bar assembly 150.

In this embodiment, pivoting the handle 400 along the rotating path 430 generates an input rotation. The expression “generating an input rotation” can refer to the pivoting motion caused by the actuation of the handle 400, which generates a force that can be used to operate other components of the discharging mechanism 200. In this embodiment, the input rotation generated via the handle 400 is transmitted to the lever mechanism 500 via the transmission assembly 300. It should thus be appreciated that the transmission assembly 300 can be tuned to facilitate unloading material from the sleigh 100 using the input rotation generated via the handle 400. For example, in this embodiment, the transmission assembly 300 is tuned to facilitate initial lifting of the sleigh 100 by dividing the input rotation during a first segment of the rotating path 430, and to facilitate ejecting material from the sleight 100 via a catapult-like effect by multiplying the input rotation during a second segment of the rotating path 430.

As used herein, the expression “dividing the input rotation” can refer to a strong gearing between the handle 400 and the lever mechanism 500 (and/or between the proximal shaft 312 and distal shaft 322) such that movement of the handle 400 along the first rotation segment causes a slower rotation of the lever mechanism 500. In other words, an input rotation imparted to the proximal shaft 312 causes a slower corresponding rotation of the distal shaft 322 during movement along the first segment of the rotating path 430 relative to the rotation speed during movement along the second segment of the rotating path 430. A “strong” gearing can be understood as any gearing ratio less than 1:1, such as 1:2, 1:4, 1:8, 1:16, or more. As can be appreciated, such gearing can reduce the manual torque required in order to allow the lever mechanism 500 to lift a loaded sleigh 100.

As used herein, the expression “multiplying the input rotation” can refer to a gearing between the handle 400 and the lever mechanism 500 (and/or between the proximal shaft 312 and distal shaft 322) such that a rotation of the handle 400 during the second segment of the rotating path 430 causes a similar or faster rotation of the lever mechanism 500. In other words, an input rotation imparted to proximal shaft 312 induces a similar or faster corresponding rotation of the distal shaft 322, when compared to the rotation speed during movement of the handle along the first segment of the rotating path 430. Such gearing can be understood to be a direct-drive gearing ratio (i.e., a 1:1 gearing ratio), and/or an overdrive gearing ratio (i.e., a gearing ratio greater than 1:1, such as 1.09:1). As can be appreciated, this configuration of the gearing enables the manual torque applied to handle 400 to accelerate the lever mechanism 500, thereby allowing the sleigh to eject material forward for unloading, such as via a catapult-like effect.

With reference to FIG. 9, a graph 700 illustrates operation of the above-described transmission assembly compared to a direct actuation mechanism. The term “direct actuation mechanism” refers to a mechanism having an actuation involving a constant direct-drive between the rotation of the handle and the rotation of the sleigh. In other words, the rotation output of the sleigh is directly proportional to the rotation input of the handle (e.g., a 1:1 gearing ratio) throughout the full rotation of the handle. As shown by curve 701, the rotation ratio between the handle and the sleigh is 1 to 1 with the direct actuation mechanism. For example, the handle can be pivoted by one degree for the angle of inclination of the shovel to be rotated by one degree. In contrast, with the transmission assembly of the pivotal sleigh shovel 10, the rotation ratio between the handle and the sleigh varies along the rotating path of the handle (e.g., during operation of the handle).

As shown by curve 702, during a first segment of rotation of the handle, the rotation ratio between the handle and sleigh is less than 1 to 1. For example, the handle can be pivoted by more than one degree to cause a corresponding one degree inclination of the sleigh. This rotation ratio increases throughout the first segment of rotation, for example starting at 1:4, and increasing to 1:2, to 3:4, until it reaches 1:1. In other words, the angle of rotation of the handle required to generate a corresponding rotation of the shovel decreases as the handle is actuated/rotated. In some embodiments, the first segment of rotation of the handle can correspond to a rotation of the handle between 0 and 60 degrees, as represented by the arcuate portion of curve 702, although other configurations are possible.

During a second segment of rotation of the handle, the rotation ratio between the handle and sleigh is greater than or equal to 1 to 1, where the handle is rotated by one degree and the inclination of the shovel increases by one degree or more. This rotation can increase throughout the second segment of rotation, for example starting at 1:1, and increasing to 1.09:1. As it can be appreciated, contrary to the direct actuation mechanism, the transmission assembly described above allows reducing the manual actuation effort required to rotate the shovel. The transmission assembly also allows for catapulting the material out of the sleigh near the end of the rotation movement of the handle. In some embodiments, the second segment of rotation of the handle can correspond to a rotation of the handle greater than 60 degrees, as represented by the straight portion of curve 702, although other configurations are possible.

With reference to FIGS. 6 to 8, in this embodiment, the division and the multiplication of the input rotation is accomplished by the relative orientation of the cams 336, 338 while the handle 400 is in the first 420 and second 422 positions. As can be appreciated, the movement of the handle 400 causes the proximal shaft to rotate about the corresponding pivoting axis 440, causing the proximal cam 336 to change orientation. In a similar manner, the change in orientation of the proximal cam 336 translated through the connecting rod 330 causes the distal cam 338 to rotate.

In this embodiment, when the handle 400 is in the first position 420, the proximal cam 336 is substantially parallel to the lengthwise axis (L), while the distal cam 338 is substantially perpendicular thereto. In particular, the end of the proximal cam 336 (connected to the first end of the connecting rod 330) is oriented towards the lower end 170 of the push bar assembly 150, and the lengthwise axis of the proximal cam 336 is substantially parallel with the longitudinal members 154 of the push bar assembly 150. Similarly, the end of the distal cam 338 (connected to the second end of the connecting rod 330) is oriented away from the upper end 160 and lower end 170 of the push bar assembly 150, and the lengthwise axis of the distal cam 338 is substantially perpendicular to the longitudinal members 154 of the push bar assembly 150. It should be noted that, in this position, the length of the connecting rod 330 is substantially aligned with the lengthwise axis of the proximal cam 336.

When the handle 400 is in the second position 422, the proximal cam 336 is substantially perpendicular to the lengthwise axis (L), while the distal cam 338 is substantially parallel to the lengthwise axis (L). In particular, in the second position 422, the end of the proximal cam 336 is oriented away from the upper end 160 and lower end 170 of the push bar assembly 150, and the lengthwise axis of the proximal cam 336 is substantially perpendicular to the longitudinal members 154 of the push bar assembly 150. Similarly, the end of the distal cam 338 is oriented towards the upper end 160 of the push bar assembly 150, and the lengthwise axis of the proximal distal cam 338 is substantially parallel with the longitudinal members 154 of the push bar assembly 150. It this position, it should be noted that the length of the connecting rod 330 is substantially perpendicular to the lengthwise axis of the proximal cam 336.

As can be appreciated, the transmission assembly 300 allows input rotation from handle 400 to cause a corresponding rotation in the lever mechanism 500. In particular, as the handle 400 is rotated, a rotation is imparted on proximal shaft 312, which in turn imparts a rotation on proximal cam 336. The rotation of proximal cam 336 is transmitted via connecting rod 330 to the distal cam 338, which in turn rotates the distal shaft 322 along the corresponding pivoting axis 540. The rotation of the distal shaft rotates the lever mechanism 500 between a lowered position 520 and a raised position 530.

In this embodiment, when the lever mechanism 500 is in the lowered position 520 (FIGS. 6, 7 and 18), the wheels 504 are proximate to or abut the bottom panel of the sleigh 100, so as to be aligned with the curved mid-section of the bottom panel. The positioning of the wheels 504 in the lowered position 520 allows the shovel 10 to be tilted so that the wheels 504 roll on the ground and to facilitate moving the shovel 10 from one location to another.

When the lever mechanism is in the raised position 530 (FIGS. 8 and 19), the wheels 504 abut against the bottom panel of the sleigh 100. In this position, the arms of the lever mechanism 500 are raised so as to be substantially parallel to the ground. During the transition between the lowered position and the raised position, the lever mechanism 500 applies an upward force to the bottom panel 114 to pivot the sleigh 100. In this embodiment, the upward force is applied by the wheels 504 engaging the curved mid-section 117 of the bottom panel 114, thereby pivoting the sleigh 100 between the loading configuration 120 to the discharging configuration 130. Moreover, the arms 502 are shaped so as to maintain uniform contact between the wheels 504 and curved mid-section 117 of bottom panel 114 as the lever mechanism moves between the lowered and raised positions. It should be noted that other configurations can be considered where the lever mechanism 500 is shaped in ways that allow the wheels to engage the rear and bottom sections of the bottom panel.

In some embodiments, the discharge mechanism 200 further includes stoppers 410 (shown in FIG. 1) positioned to limit the possibility of “over-rotating” the handle 400. In this embodiment, the stoppers 410 are positioned on each longitudinal members 154 of the push bar assembly 150 and below each corresponding longitudinal member 404 of the handle 400. In the loading configuration 120, the orientation of the cams 336, 338 causes the longitudinal members of the handle 400 to be biased towards and abut their corresponding stopper 410. More specifically, the cams 336, 338 are oriented such that the connecting rod 330 points below the pivoting point 440. In particular, as seen in FIG. 7, a vector (V) oriented from the second end of the connecting rod 330 to the first end of the connecting rod 300 points below the pivoting axis 440, such as below the proximal shaft. In this configuration, while the shovel in the loading configuration 120 and the wheels 504 are in contact with the ground, an upward force applied to the wheels 504 results in the longitudinal members of the handle 400 to be forced towards their corresponding stopper 410.

Now referring to FIGS. 6 and 7, the locking mechanism can be operable to prevent the sleigh 100 from rotating while in the loading configuration 120. To do so, the locking mechanism can be operated between a locked configuration 620 and a release/unlocked configuration 622. While in the lock configuration 620, the locking mechanism can prevent rotation of the sleigh 100, thereby maintaining the sleigh 100 in the loading configuration 120. The locking bolt mounted proximate the fin of the rear panel of the sleigh 100 can be engaged in the latch mounted on the corresponding longitudinal member of the push bar assembly. In this configuration, the locking bolt is received within the aperture of the latch and is secured by the teeth assembly. As can be appreciated, the teeth assembly can be configured to allow a push-to-close function. In other words, the teeth assembly can include a spring-loaded mechanism allowing the locking bolt to be engaged in aperture by pushing the locking bolt against the teeth with sufficient force.

In the release configuration 622, the locking bolt can be disengaged from the latch, thereby allowing the sleigh 100 to rotate towards the discharging configuration 130. In this embodiment, the disengagement of locking bolt from the latch is permitted by the lower tooth pivoting away from and releasing the locking bolt. The transition between the lock configuration 620 and the release configuration 622 can be carried out by the manual operation of the actuator 601. In this embodiment, pivoting the unlocking lever 602 towards the transversal member of the handle 400 transitions to the release configuration 622. The pivoting movement originating from the unlocking lever is translated via the cable to the latch, causing the lower tooth to pivot away from the locking bolt. With the lower tooth pivoted away, the locking bolt can move freely out of the latch, allowing the sleigh 100 to be rotated freely.

Referring back to FIGS. 1 to 3, in some embodiments, the pivoting axes 440, 540, 240 described herein can be respectively referred to as a first pivoting axis, a second pivoting axis and a third pivoting axis. As shown, the first pivoting axis 440 can be positioned proximate the upper end 160 of the push bar assembly 150. In this embodiment, the first pivoting axis 440 is aligned with the proximal shaft 312. The second pivoting axis 540 can be positioned at an intermediate position between the upper end 160 and the lower end 170 of the push bar assembly 150. In this embodiment, the second pivoting axis 540 is aligned with the distal shaft 322. The third pivoting axis 240 can be positioned proximate the lower end 170 of the push bar assembly 150. In this embodiment, the third pivoting axis 240 corresponds to the pivotal connection between the side panels 110 of the sleigh 100 and their respective longitudinal members 154 of the push bar assembly 150.

In some embodiments, and as described above, the shovel can be manually actuated such that the discharge mechanism is operated using an input force provided by a user operating the shovel. More specifically, manual operation of the handle (e.g., pulling or releasing the handle) moves (e.g., rotates) the sleigh between the loading configuration and the discharging configuration. With reference to FIGS. 10 to 19, another embodiment of the shovel 10 is shown. In this embodiment, the shovel 10 includes an actuation mechanism 800 operable to move the sleigh between the loading configuration (FIGS. 10, 12, and 18) and the discharging configuration (FIG. 19) with little to no input forces provided by the user. For instance, the actuation mechanism 800 allows the user to forego pulling the handle to move the sleigh between the loading configuration and the discharging configuration. In some embodiments, the actuation mechanism 800 can be operable to engage the distal shaft 322 in rotation about the pivoting axis 540, which in turn imparts rotation to the lever mechanism 500 to activate the discharge mechanism 200.

In this embodiment, when the lever mechanism 500 is in the lowered position 520, the wheels 504 can be positioned substantially coplanar to the bottom panel of the sleigh 100. As can be appreciated, the positioning of the wheels 504 in the lowered position 520 allows the shovel 10 to be tilted (e.g., rearwardly) so that the sleigh 100 is prevented from contacting or dragging on the ground surface, with the wheels 504 rolling on the ground to facilitate moving the shovel 10 from one location to another.

In this embodiment, the actuation mechanism 800 includes a gear box assembly 805 provided with a motor 802 and a motorized transmission assembly 804 operatively coupled to the lever mechanism 500 via the distal shaft 322. The motor 802 is operable to engage the motorized transmission assembly 804, which in turn engages the distal shaft 322 in rotation. As with previous embodiments, it is noted that rotation of the distal shaft 322 about the pivoting axis 540 imparts rotation to the lever mechanism 500 to operate the sleigh 100 between the loading configuration and the discharging configuration. In the illustrated embodiment, the motorized transmission assembly 804 includes a worm system including a worm gear 806 and a spur gear 808. The worm gear 806 is operatively coupled to the motor 802, while the spur gear 808 is coupled to the distal shaft 322. It should be understood that operation of the motor 802 engages the worm gear 806 in rotation, which in turn engages the spur gear 808 in rotation to actuate the lever mechanism 500 via rotation of the distal shaft. It should be noted that different types and/or configurations of gears can be used as part of the motorized transmission assembly 804. For instance, beveled gears, rack-and-pinions gears and/or any combination of the same and/or different types of gears can be used. Similarly, the gear ratio of the motorized transmission assembly can be any suitable and/or desired gear ratio (e.g., based on the chosen type and size of gears).

It is appreciated that any other suitable type of actuation mechanisms 800 can be implemented for actuating the shovel 10, such as linear actuators, pistons (e.g., hydraulic, pneumatic and/or electric), etc., for example. In addition, in this embodiment, the motor 802 corresponds to an electric motor, although other configurations are possible. The actuation mechanism 800 therefore includes a power source 801, such as a battery 803, provided at any suitable location on the shovel 10. In this embodiment, the battery and the gearbox assembly 805 (e.g., the electrical motor 802 and the motorized transmission assembly 804) are provided opposite one another across the width of the sleigh 100. It should be understood that the battery 803 is operatively coupled to the motor 802 and provides the required electrical power to enable operation thereof.

In order to operate the actuation mechanism 800, the shovel 10 can be provided with an electrical actuator 810 operable by the user. The electrical actuator 810 can include any suitable device, such as a lever mechanism, a button, etc. In this embodiment, the electrical actuator 810 includes a rotatable handle 812, at least partially mounted to the push bar assembly 150. The electrical actuator 810 can be similar to the actuator 601 described in relation with previous embodiments comprising the unlocking lever 602 (see FIGS. 6 and 7). More specifically, the electrical actuator 810 can include an electrical switch 814 and a cable 816 operatively connecting the rotatable handle 812 to the motor 802. It is thus noted that the rotatable handle 812 can be manually operated (e.g., pulled) to actuate the electrical switch 814 for operating the motor 802.

In some embodiments, the rotatable handle 812 can be operated between an idle configuration, where the sleigh 100 is in the loading configuration, and an actuated configuration, where the sleigh is in the discharging configuration. It is noted that moving the rotatable handle 812 from the idle to the actuated configuration operates the actuation mechanism 800 and engages the sleigh in movement, e.g., from the loading configuration to the discharging configuration. In other words, pulling the rotatable handle 812 initiates discharge of the sleigh. In some embodiments, returning the rotatable handle to the idle configuration (from the actuated configuration) engages the motor in rotation in the opposite direction, thus returning the sleigh in the loading configuration.

As seen in FIG. 15, the rotatable handle 812 can include a biasing device 820 configured to bias the rotatable handle in the idle configuration. Therefore, in this embodiment, when in the actuated configuration, the biasing device 820 is configured to revert the rotatable handle 812 to the idle configuration upon releasing the rotatable handle 812. For instance, the user can simply let go of the rotatable handle 812 in order to revert the shovel in the loading configuration. In this embodiment, the biasing device 820 includes a resilient element 822, such as a spring 824, configured to generate a rotational force on the rotatable handle 812 upon positioning the rotatable handle 812 in the actuated configuration. The rotational force is adapted to revert the movement of the handle 812, and therefore return the rotatable handle to the idle configuration. It is thus noted that the spring 824 is configured to extend upon operating the rotatable handle in the actuated configuration, and is configured to revert to its initial shape and size upon releasing the rotatable handle. It should be noted that other biasing devices and configurations thereof are possible for assisting the user in reverting the sleigh in the loading configuration, for example, after having discharged the contents of the sleigh.

It will be appreciated from the foregoing disclosure that there is provided a pivotal sleigh shovel adapted to allow material to be loaded into the sleigh of the shovel and discharged without tipping over the shovel or applying considerable effort in actuating the handle. The discharging mechanism is configured to allow the material to be easily discharged by rotating the sleigh. The transmission mechanism includes a pivotable handle adapted to generate an input rotation when actuated. The input transmission can be transferred from the handle to a lever mechanism via a transmission assembly adapted to initially divide the input rotation and then multiply the rotation. The transmitted input rotation allows the lever mechanism to effectively apply an upward force to pivot the sleigh to discharge the material.

While the present disclosure describes features of example implementations, it will be appreciated that some features and/or functions of the described implementations are susceptible to modification without departing from the principles of operation of the described implementations. For example, the various characteristics which are described by means of the represented implementations or examples may be selectively combined with each other. Accordingly, what has been described above is intended to be illustrative and non-limiting. It will be understood by persons skilled in the art that other variants and modifications may be made.

In the present disclosure, an embodiment is an example or implementation of the described devices, systems and methods. The various appearances of “one embodiment,” “an embodiment” or “some embodiments” do not necessarily all refer to the same embodiments. Although various features may be described in the context of a single embodiment, the features may also be provided separately or in any suitable combination. Conversely, although the described devices, systems and methods may be described herein in the context of separate embodiments for clarity, it may also be embodied in a single embodiment. Reference in the specification to “some embodiments”, “an embodiment”, “one embodiment”, or “other embodiments”, means that a particular feature, structure, or characteristic described in connection with the embodiments is included in at least some embodiments, but not necessarily in all embodiments.

As used herein, the terms “coupled”, “coupling”, “attached”, “connected” or variants thereof as used herein can have several different meanings depending on the context in which these terms are used. For example, the terms coupled, coupling, connected or attached can have a mechanical connotation. For example, as used herein, the terms coupled, coupling or attached can indicate that two elements or devices are directly connected to one another or connected to one another through one or more intermediate elements or devices via a mechanical element depending on the particular context.

Similarly, positional descriptions such as “top”, “bottom”, “above”, “under”, “below”, “left”, “right”, “front”, “rear”, “parallel”, “perpendicular”, “transverse”, “inner”, “outer”, “internal”, “external”, and the like should, unless otherwise indicated, be taken in the context of the figures and should not be considered limiting.

In the above description, the same numerical references refer to similar elements. Furthermore, for the sake of simplicity and clarity, namely so as to not unduly burden the figures with several references numbers, not all figures contain references to all the components and features, and references to some components and features may be found in only one figure, and components and features of the present disclosure which are illustrated in other figures can be easily inferred therefrom. The implementations geometrical configurations, materials mentioned and/or dimensions shown in the figures are optional, and are given for exemplifications purposes only.

In addition, although the optional configurations as illustrated in the accompanying drawings comprises various components and although the optional configurations of the described devices and systems as shown may consist of certain geometrical configurations as explained and illustrated herein, not all of these components and geometries are essential and thus should not be taken in their restrictive sense, i.e. should not be taken as to limit the scope of the present disclosure. It is to be understood that other suitable components and cooperations thereinbetween, as well as other suitable geometrical configurations may be used for the implementation and use of the described devices and systems, and corresponding parts, as briefly explained and as can be easily inferred herefrom, without departing from the scope of the disclosure.

In some aspects, embodiments of the present invention as described herein include the following items:

1. A pivotal sleigh shovel comprising:

- a push bar assembly having an upper end and a lower end opposite the upper end;
- a sleigh pivotally connected to the lower end of the push bar assembly, the sleigh having side panels and a bottom panel extending between the side panels for defining a volume therebetween, the sleigh being operable between a loading configuration for containing and transporting material within the volume, and a discharging configuration, where the sleigh is pivoted upwardly for discharging the material from within the volume;
- a discharge mechanism operatively connected to the push bar assembly and configured for moving the sleigh between the loading configuration and the discharging configuration, the discharge mechanism comprising:
  - a rotatable handle pivotally connected to the push bar assembly about a first pivoting axis, the rotatable handle being movable along a rotating path between a first position and a second position to generate an input rotation;
  - a lever mechanism pivotally connected to the push par assembly about a second pivoting axis and adapted to pivot the sleigh towards the loading configuration, the lever mechanism having a load end configured to apply a force on the sleigh upon rotation of the lever mechanism about the second pivoting axis; and
  - a transmission assembly operatively coupled between the rotatable handle and the lever mechanism, the transmission assembly being configured to transfer the input rotation to the lever mechanism to engage the lever mechanism in rotation about the second pivoting axis, the transmission assembly being tuned to divide the input rotation during a first segment of the rotating path, and to multiply the input rotation during a second segment of the rotating path.
    
    2. The pivotal sleigh shovel of item 1, wherein, when in the loading configuration the sleigh rests on the push bar assembly, and in the discharging configuration the sleigh is pivotally rotated away from the push bar assembly.
    
    3. The pivotal sleigh shovel of item 1 or 2, wherein, when in the loading configuration, the bottom panel is substantially parallel to a ground surface, and in the discharging configuration the sleigh is pivoted forwardly by an angle of inclination between 0° and 90°.
    
    4. The pivotal sleigh shovel according to any one of items 1 to 3, wherein the push bar assembly comprises spaced-apart longitudinal members and a transversal member extending between the longitudinal members at the upper end of the push bar assembly, each side panel of the sleigh being pivotally connected to a corresponding one of the longitudinal members proximate the lower end of the push bar assembly.
    
    5. The pivotal sleigh shovel according to items 4, wherein the side panels comprise respective fins extending outwardly therefrom, the fins being adapted abut on a corresponding one of the longitudinal members when the sleigh is in the loading configuration.
    
    6. The pivotal sleigh shovel according to item 4 or 5, wherein the transmission assembly comprises:
- a proximal shaft operatively coupled to the rotatable handle and extending between the longitudinal members along the first pivoting axis;
- a distal shaft operatively coupled to the lever mechanism and extending between the longitudinal members along the second pivoting axis;
- a connecting rod having a first end pivotally connected to the proximal shaft and a second end pivotally connected to the distal shaft;
- wherein rotation of the rotatable handle engages the proximate shaft in rotation about the first pivot axis, which engages the connecting rod in rotation, which in turn engages the distal shaft in rotation about the second pivoting axis for actuating the lever mechanism
  
  7. The pivotal sleigh shovel according to item 6, wherein the transmission assembly further includes a proximal cam rotatably mounted to the proximal shaft and a distal cam rotatably mounted to the distal shaft, and wherein the connecting rod is connected to and extends between the proximal cam and the distal cam.
  
  8. The pivotal sleigh shovel according to item 7, wherein, when in the loading configuration, the proximal cam is oriented substantially in alignment with a lengthwise axis extending between the upper end and the lower end of the push bar assembly, and the distal cam is oriented transversely relative to the lengthwise axis, and wherein, when in the discharging configuration, the proximal cam is oriented transversely relative to the lengthwise axis.
  
  9. The pivotal sleigh shovel according to any one of items 6 to 8, wherein the discharge mechanism comprises stoppers connected to the push bar assembly and adapted to limit over-rotation of the rotatable handle when moving from the second position to the first position, and wherein, when in the loading configuration, a longitudinal axis of the connecting rod extends below the first pivoting axis.
  
  10. The pivotal sleigh shovel according to any one of items 1 to 9, wherein the first pivoting axis is positioned proximate to the upper end of the push bar assembly, the second pivoting axis is positioned at an intermediate position between the upper end and lower end of the push bar assembly, and the sleigh is pivotally connected to the push bar assembly at a third pivoting axis defined at the lower end of the push bar assembly.
  
  11. The pivotal sleigh shovel according to any one of items 1 to 10, further comprising a locking mechanism operable between a lock configuration, where the locking mechanism prevents rotation of the sleigh while in the loading configuration, and a release configuration, where the locking mechanism is disengaged, thereby allowing the sleigh to rotate towards the discharging configuration.
  
  12. The pivotal sleigh shovel of item 11, wherein the locking mechanism comprises a latch mounted on the push bar assembly, a locking bolt mounted on the sleigh and positioned to engage the latch when the sleigh is in the loading configuration, and an actuator operable to release the latch to allow the locking bolt to disengage the latch.
  
  13. The pivotal sleigh shovel of item 12, wherein the actuator comprises an unlocking lever coupled to the rotatable handle, and a cable operatively connecting the unlocking lever to the latch.
  
  14. The pivotal sleigh shovel according to any one of items 1 to 13, wherein the load end of the lever mechanism comprises one or more wheels configured to abut and roll against the bottom panel of the sleigh.
  
  15. The pivotal sleigh shovel according to item 14, wherein the bottom panel of the sleigh comprises a rear section, a bottom section, and a curved mid-section extending between the bottom section and the rear section, and wherein the wheels are positioned to roll against the curved mid-section of the bottom panel while pivoting the sleigh between the loading configuration and the discharging configuration.
  
  16. The pivotal sleigh shovel according to any one of items 1 to 16, wherein the lever mechanism includes one or more arms extending between the transmission assembly and the sleigh.
  
  17. The pivotal sleigh shovel according to item 16, wherein the one or more arms are substantially J-shaped.
  
  18. A pivotal sleigh shovel comprising:
- a push bar assembly having an upper end and a lower end opposite to the upper end;
- a sleigh pivotally connected at the lower end of the push bar assembly for containing material;
- a discharge mechanism mounted to the push bar assembly, the discharge mechanism comprising:
- a rotatable handle operable to generate an input rotation;
- a lever mechanism pivotally connected to the push par assembly; and
- a transmission assembly operatively connecting the rotatable handle and the lever mechanism, to transfer the input rotation generated by the handle to the lever mechanism;
  
  wherein the discharge mechanism is adapted to pivotally rotate the sleigh away from the push bar assembly to discharge the sleigh upon operation of the rotatable handle.
  
  19. A pivotal sleigh shovel comprising:
- a push bar assembly having an upper end and a lower end opposite to the upper end;
- a sleigh pivotally connected to the push bar assembly proximate the lower end thereof, the sleigh being operable between a loading configuration for containing and transporting material therein, and a discharging configuration, where the sleigh is pivoted upwardly for discharging the material therefrom;
- a discharge mechanism operatively connected to the push bar assembly and operable for moving the sleigh between the loading configuration and the discharging configuration, the discharge mechanism comprising:
  - a lever mechanism pivotally coupled to the push bar assembly and configured to engage and pivot the sleigh between the loading and discharging configurations;
  - an actuation mechanism mounted to the push bar assembly and operatively connected to the lever mechanism, the actuation mechanism being configured to induce rotation of the lever mechanism upon operation thereof;
  - an actuating handle connected to the push bar assembly and adapted to operate the actuation mechanism;
    
    wherein the discharge mechanism is adapted to pivotally rotate the sleigh away from the push bar assembly to discharge the sleigh upon operation of the actuating handle.
    
    20. The pivotal sleigh shovel according to item 19, wherein the actuation mechanism comprises an electric motor and a gear box assembly, the gear box assembly being operatively coupled to the lever mechanism such that operation of the actuating handle engages the electric motor in rotation, which engages the gear box assembly in rotation, which in turn engages the lever mechanism in rotation for pivoting the sleigh.

PIVOTAL SLEIGH SHOVEL

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