Patent Application
20230053108
This application claims priority to and all benefit of Canadian Patent Application Serial No. 3127409, filed on Aug. 11, 2021, the entire disclosure of which is fully incorporated herein by reference.
The present invention relates to a braking mechanism that can be applied to the exterior of a rotary drum. In particular, the braking mechanism can be used with a rotary cutter head, such as a molder or planer apparatus.
A molder/planer apparatus can be used to precisely shape and plane lumber or other materials. The apparatus typically includes a rotary axle or spindle that is outfitted with a cutter head having blades or knives that are interchangeable based on the desired shaping. When in use, the cutter head spins at a high rate of speed and carries considerable inertia. When power is cut to the apparatus, the cutter head can continue to spin for a considerable period of time. This can potentially be a safety issue, and can also delay subsequent use of the apparatus.
There is a need for a braking mechanism that arrests the axle and brings the cutter head safely to a stop in a shorter period of time. While various braking mechanisms exist in the art, particularly in conjunction with planers/molders or similar equipment, there is a need for a braking mechanism that is simple, cost effective to manufacture, and straightforward to operate and service.
According to an aspect of the present invention, there is provided a braking system for a rotating member comprising a lever having a first arm, a second arm, and an apex positioned where the first arm meets the second arm, the apex of the lever being rotationally secured to a support. A band that wraps around a portion of the circumference of an end of the rotating member, a first end of the band is secured to the support, and a second end of the band is secured to the second arm of the lever. A resilient member, a first end of the resilient member is secured to the first arm of the lever, and a second end of the resilient member is secured to the support. An actuator secured to the first arm of the lever. The resilient member biases the first arm of the lever to place the band in frictional engagement with the circumference of the rotating member, and activation of the actuator directs the first arm of the lever to relieve the frictional engagement of the band with the circumference of the rotating member.
In another aspect, a braking system for a rotating member comprising a checkmark shaped lever comprises a long arm, a short arm, and an apex, the apex of the lever being rotationally secured to a support. A band that wraps around a portion of the circumference of an end of the rotating member, a first end of the band is secured to the support, and a second end of the band is secured to the short arm of the lever. A resilient member, a first end of the resilient member is secured to the long arm of the lever, and a second end of the resilient member is secured to the support at a position below the lever. An actuator secured to the long arm of the lever. The resilient member biases the long arm of the lever downward, placing the band in frictional engagement with the circumference of the rotating member, and activation of the actuator directs the long arm of the lever upward, which relieves the frictional engagement of the band with the circumference of the rotating member.
In one embodiment, the lever is located above the rotating member, and when in a resting position, the long arm is substantially horizontal and the short arm points downward.
In an embodiment, the rotating member is an end of a rod, the rod having a cutter head secured thereon. In another embodiment, the rotating member is a drum secured to the end of a rod, the rod having a cutter head secured thereon.
In an embodiment, an angle between the short arm and the long arm of the lever is between 10° and 90°, preferably 30° to 85°, and more preferably 45° to 80°.
In a further embodiment, the band wraps around at least 270° of the circumference of the rotating member.
In another embodiment, the resilient member is a spring.
In yet another embodiment, the band is made of a pliable and/or resilient material. In an embodiment, the system further comprises a cover that substantially encloses the braking system.
In another embodiment, the system further comprises a guide that limits the displacement of the band away from the circumference of the rotating member.
According to another aspect of the present invention, there is provided a moulder/planer apparatus comprising the braking system as defined herein.
Reference will now be made, by way of example, to the accompanying drawings which show exemplary embodiments of the present application, and in which:
The features and benefits of the present disclosure are illustrated and described herein by reference to exemplary embodiments and is in no way intended to limit the invention, its application, or uses. This description of exemplary embodiments is intended to be read in connection with the accompanying drawings, which are to be considered part of the entire written description. Accordingly, the present disclosure expressly should not be limited to such embodiments, and features of each embodiment described herein may be combined with each other to form further embodiments.
In the description of embodiments disclosed herein, any reference to direction or orientation is merely intended for convenience of description and is not intended in any way to limit the scope of the present invention. Relative terms such as “below”, “downward”, “upward”, and derivatives thereof, or any other terms related to direction or orientation should be construed to refer to the orientation as then described or as shown in the drawing(s) under discussion. These relative terms are for convenience of description only and do not require that the invention be constructed or operated in a particular orientation.
The present invention is a braking system. While the braking system is described with regard to a rotary cutter head, such as would be found in a moulder or a planer apparatus, it is to be understood that the braking system can be utilized in other contexts in which rotational movement is to be curtailed, particularly if the rotating component can be affixed to a drum that would integrate into the braking system as discussed below.
In the apparatus 4, the cutter head 10 is generally arranged around a rod or axle 12, which in this embodiment, tapers at opposing ends to form a spindle. A motor (not shown) is operably connected to the rod 12, which when actuated by the user, causes the rod 12 and cutter head 10 to rotate at a high velocity. When the power is cut to the motor, in the absence of a braking system, the rod 12 and cutter head 10 continue to spin until momentum dissipates, bringing the rod 12 and cutter head 10 to a halt.
Although the braking system 2 can be applied directly a first end 16 of the rod 12, in this embodiment, as can be seen in
In the illustrated embodiment, the braking system 2 includes a band 20 that is shaped and dimensioned to envelop at least a portion of the outer circumference of the drum 14. The band 20 ultimately makes contact with the outer circumference of the drum 14, and it is the friction generated by this contact that slows the drum's rotational movement. While the entire circumference of the drum 14 will typically not be covered by the band, it is preferable that as much of the circumference as possible be covered, as this will increase the surface area between the band 20 and the drum 14, thereby increasing the efficacy of the braking system 2. Preferably, at least 180°, or more preferably at least 270° of the outer circumference of the drum 14 is enveloped by the band 20.
The band 20 is preferably made of a strong yet pliable and resilient material that is capable of flexing and bending, and that can withstand the friction that is generated as it contacts the drum 14. As shown in
The support 24 is effectively a scaffolding that serves as an attachment point for various components of the braking system 2. The support 24 may ultimately be secured to the housing 8 of the apparatus 4, as is shown in
The band 20 then extends around a portion of the circumference of the drum 14, and a second end 28 of the band 20 is anchored to a lever 30 via a second fastener 29. Again, the second end 22 of the band 20 wraps around the fastener 26, which ultimately is secured to the lever 30, although other mechanisms to secure the first end 22 of the band 20 to the lever 30 may be utilized.
A lever 30 is included in the braking system 2, and is secured to the support at its hinge point 38. The lever includes a first arm 32 on one side of the hinge point 38 and a second arm 34 on the opposing side of the hinge point 38. The shape of the lever 30 may be linear (not shown), or make take on an irregular shape as shown in the Figures and discussed below.
In the exemplary embodiment shown in the Figures, the lever 30 is substantially J-shaped or checkmark shaped, but may also be L-shaped or V-shaped. The lever 30 has a short arm 32 and a long arm 34 extending from an apex/fulcrum 36 (See e.g.
The second end 28 of the band 20 is attached at or near the free end of the short arm 32 of the lever 30. The apex 36 of the lever is hingedly attached to the support 24 with a fastener 40, such as a bolt or a screw, thereby allowing the lever 30 to rotate about a hinge point 38. A gasket, washer, or similar component 40 can be incorporated into the hinge point 38 to facilitate the rotational movement of the lever 30 about the fastener 26.
A resilient member, such as a spring, it attached at or near the free end of the long arm 34 of the lever 30. The opposing end of the resilient member 42 is anchored to the support 24 at a position below the lever 30. While only one resilient member 42 is shown, a plurality of resilient members 42 can be used to provide additional tension on the lever 30.
The tension provided by the resilient member 42 pulls the free end of the long arm 34 of the lever 30 downward, which causes the lever 30 to rotate about the hinge point 38. With the shape of the lever 30, the lever 30 causes the short arm 32 to move away from the resilient member 42, bringing the second end 28 of the band 20 toward the first end 22 of the band 20. This movement tightens the band 20 around the circumference of the drum 14. The resulting friction generated from the contact between the band 20 and the outer circumference of the drum 14 minimizes or inhibits rotational movement of the drum 14 and the connected cutter head 10. When the apparatus is not in use, the resilient member 42 biases the braking system 2 in this default engaged or braking position.
In an alternative embodiment, the resilient member biases the first arm of the lever to disengage the band from the outer circumference of the rotating member to allow for operation, and activation of the actuator directs the first arm of the lever to engage the frictional engagement of the band with the circumference of the rotating member to brake.
An actuator 44 is also connected at or near the free end of the long arm 34 of the lever 30. The actuator is under the control of the user of the apparatus 4. In this embodiment, it is shown as a cable, although other such mechanisms that can apply a force to the free end of the long arm 34 of the lever 30 may be used. The actuator 44 can ultimately be connected with a throttle or a brake button e.g. on a control panel (not shown). Activation of the throttle (or release of the brake) by the user causes the actuator 44 to pull the free end of the long arm 34 of the lever 30 generally upward against the resistance provided by the resilient member 42. This movement of the long arm 34 causes the lever 30 to rotate about the hinge point 38. This rotational movement of the lever 30 moves the short arm 32 toward the resilient member 42, which brings the second end 28 of the band 20 away from the first end 22 of the band 20. The resulting displacement of the band 20 creates some slack, and may even create a gap between the band 20 and the circumference of the drum 14. This displacement ultimately disrupts the frictional engagement between the band 20 and the circumference of the drum 14, which permits rotational movement of the rod 12 and the cutter head 10. The braking system is now in an unengaged position.
The orientation of the lever 30 may vary, and is generally related to where the actuation of lever is coming from. For example, in the Figures the actuator 44 is located above the braking system 2, and therefore, the lever 30 is substantially horizontal. This allows the actuated lever 30 to pivot sufficiently to relieve the frictional engagement of the band 20 on the drum 14. Alternatively, if the actuator 44 was located at a side of the braking system 2, the lever 30 would be substantially vertical.
To return the braking system 2 to the engaged position, the user has to merely release the throttle (or otherwise engage the braking system), which will stop the upward pull on the free end of the long arm 34 of the lever 30. The tension applied by the resilient member 42 will pull the free end of the long arm 34 of the lever 30 downward, which will cause the band 20 to frictionally engage the circumference of the drum 14 facilitating the end of the rotational movement of the rod 12 and cutter head 10.
Optionally, a guide 46 is included, which serves to limit the amount of displacement of the band 20 from around the drum 14. If too much slack is created in the band 20, or the band 20 is displaced too far from the circumference of the drum 14, this may decrease the effectiveness of the braking system 2. Guide 46 prevents the band 20 from rubbing against the rotating drum brake, thus prevents the band from wear. The guide 46 can be adjustable, such as a screw or threaded bolt as shown in the Figures, which will allow for the amount of allowed displacement of the band 20 to be adjusted as desired.
| Number | Date | Country | Kind |
|---|---|---|---|
| 3127409 | Aug 2021 | CA | national |
