This invention relates generally to mobile structures, and more particularly to mobile structures that are stowable and releasably securable in a predetermined location to a wall or other rigid body to maximize floor space.
Mobile workstations are used in various industries and environments to provide working surfaces or cabinet storage space. For example, such workstations are used in a medical setting to provide a working surface for computers and peripherals that enter data into a hospital database, or to provide cabinet storage space for medications administered to patients. The lower end of workstation may include one or more legs laterally extending there-from and in contact with the floor, with the legs including wheels or casters to facilitate the rolling transport of the workstation across the floor.
Although mobile workstations are beneficial in a hospital setting, they must compete for valuable floor space within the confines of patients' rooms, hallways and/or nursing stations. A patient's room is often small and cluttered with various pieces of equipment or furniture, to include hospital beds and tables, intravenous fluid stands, electronic patient monitoring equipment and/or numerous other articles. Hospital hallways and nursing stations are often cluttered with numerous articles as well. Within these environments, workstations often get in the way of patients and/or medical staff and other personnel. For example, the legs of the workstation, extending laterally from the lower end thereof, may create a tripping hazard while the work surface or cabinets may occupy valuable free space within a given area. These same concerns may also be present with such workstations located in a non-hospital or other setting as well.
The present invention is a mobile structure that is stowable and releasably securable to a wall or other rigid body to maximize floor space. The mobile structure preferably comprises a frame defining upper and lower ends, a work surface or pair of cabinets located on the frame and movable between deployed and stowed positions, and a plurality of legs located at the lower end of the frame. Each leg preferably terminates at a wheel or caster to enable the rolling transport of the mobile structure across a floor or other surface. To facilitate the stowable, compact capabilities of the mobile structure, at least one leg of the plurality is movable between deployed and stowed positions. An interlock assembly is also preferably located on the frame and operable to releasably secure the structure to a rigid body in a predetermined location.
The frame preferably comprises at least one column that is preferably hollow to define a chamber extending along its length that houses other components of the mobile structure, such as a gear assembly and interlock sub-assembly, to be further discussed. In one embodiment, the at least one column comprises two columns, namely, inner and outer columns that are in telescopic relation with one another to facilitate a height adjustment of the frame. However, it is understood that the at least one column of the frame may be comprised of a single column, or any number of columns as well.
The plurality of legs, located at the lower end of the frame, provides support to the frame and remaining components of the mobile structure. At least one leg of the plurality is movable between a forward, deployed position and a rearward, stowed position in relation to the frame, while the remaining legs are preferably non-movable in relation thereto. It is understood that the plurality of legs of the mobile structure could include any number of legs, with the at least one movable leg comprising one or any number of movable legs as well. Regardless of the number of legs of a given plurality, each leg preferably defines an inner end and an outer end, with the inner ends located proximal to the lower end of the frame and the outer ends having the casters or wheels attached thereto.
The at least one movable leg is preferably pivotably connected to the frame and/or inner ends of the non-movable legs via a pivot that enables to outer end(s) to pivot or swing between the forward, deployed position and rearward, stowed position. Thus, when in the forward, deployed position, the at least one movable leg provide vertical stability to the overall mobile structure. When in the rearward, stowed position, the at least one movable leg establishes a compact configuration of the structure to maintain the leg(s) in a location away from possible physical interference with persons or other equipment.
In one embodiment, the handle is located on the frame and acts as a lever to move the at least one movable leg between the deployed and stowed positions. The handle, acting as a lever, is pivotably connected to the frame and movable between a lowered, deployed position and a raised, stowed position. When in the lowered, deployed position, the handle provides for ready access by users of the structure for the operation of the handle. When in the raised, stowed position, the handle establishes a compact configuration of the structure such that the handle is located away from possible physical interference with persons or other equipment. A movement of the handle between its deployed and stowed positions will drive the at least one movable leg between deployed and stowed positions. Thus, when the handle is in its lowered, deployed position, the at least one movable leg is the forward, deployed position. When the handle is in its raised, stowed position, the at least one movable leg is in the rearward, stowed position.
One embodiment of the mobile structure also includes a work surface located on the frame. The work surface is preferably substantially planar, defines upper and lower surfaces, and is pivotably movable between a lowered, deployed position and a raised, stowed position. In the lowered, deployed position, the work surface establishes a resting place for a laptop computer or other article while in the raised, stowed position, the work surface establishes a compact configuration of the structure such that it is located away from possible physical interference with persons or other equipment. In a further embodiment of the mobile structure having a movable work surface, the handle is operably associated with the work surface to prevent any movement of the work surface to the stowed position when the mobile structure is not secured in the predetermined location.
Further embodiments of the mobile work station having a work surface include a work surface having a set of locks for removably securing the laptop to the work surface's upper surface, and/or a computer docking station to facilitate the electrical and/or data connection of the computer to the mobile structure, and/or an electrical and/or data port that connects the structure to the predetermined location, such as to a wall of a hospital building. Such a port may comprise any number of products commercially available in the market place. In yet a further embodiment, the movable work surface is elongated such that it can span the width of a standard hospital bed.
In other embodiments, the mobile structure includes a pair of cabinets located on the frame and movable between deployed and stowed positions. Each cabinet is pivotably movable between a forward, deployed position and a rearward, stowed position. In the forward, deployed position, the pair of cabinets combines to form a single, box-like cabinet while in the rearward, stowed position, the cabinets are splayed to form planar cabinets that establish a compact configuration of the structure such that it is located away from possible physical interference with persons or other equipment. A handle is optionally located on each cabinet to facilitate movement of the cabinets between the deployed and stowed positions.
In one embodiment, the pair of cabinets are operably associated with the at least one movable leg. A movement of cabinets between their deployed and stowed positions will drive the at least one movable leg between deployed and stowed positions. When the cabinets are in their forward, deployed position, the at least one movable leg is in the forward, deployed position. When the cabinets are in their rearward, stowed position, the at least one movable leg is in the rearward, stowed position.
At least one interlock assembly is operably associated with the frame to thus releasably secure the mobile structure in the predetermined location to prevent it from possibly becoming vertically instable when the components of the structure are in the stowed position. The predetermined location may be against a wall, against another mobile structure, against a storage base, or against any other rigid body. In addition to releasably securing the mobile structure in a predetermined location, the interlock assembly is operably associated with the at least one movable leg to prevent movement of the leg to the stowed position when the mobile structure is not secured in the predetermined location, and further to prevent the interlock assembly from releasing the structure from the predetermined location when the at least one movable leg is in the stowed position. In further respective embodiments, the handle and pair of cabinets of respective mobile structure embodiments are operably associated with the interlock assembly to prevent their respective movement of the leg to the stowed position when the mobile structure is not secured in the predetermined location.
The at least one interlock assembly is preferably comprised of an interlock sub-assembly and a bracket. The interlock sub-assembly is preferably located on the frame of the mobile structure, within the chamber, while the bracket is adapted for attachment to a rigid body such as a wall, another mobile structure, a storage base or any other rigid body. Thus, via the foregoing operable association, the at least one movable leg of the mobile structure cannot be moved to the rearward, stowed position unless the mobile structure is engaged with the bracket. Similarly, the mobile structure cannot be disengaged from the bracket unless the at least one movable leg is located in the forward, deployed position. However, if the at least one movable leg is in the stowed position while the mobile structure is not engaged with the bracket, the at least one movable leg may be moved to the deployed position without the structure having to engage the bracket.
For embodiments of the mobile structure having a handle, the handle of the mobile structure cannot be moved to the raised, stowed position, (and the at least one movable leg thus cannot be moved to the rearward, stowed position) unless the mobile structure is engaged with the bracket. Also, the mobile structure cannot be disengaged from the bracket unless the handle is located in the lowered, deployed position (and the at least one leg is located in the forward, deployed position). For embodiments of the mobile structure having a pair of cabinets, the cabinets of the mobile structure cannot be moved to the rearward, stowed position (and the at least one movable leg thus cannot be moved to the rearward, stowed position) unless the mobile structure is engaged with the bracket. Also, the mobile structure cannot be disengaged from the bracket unless the pair of cabinets are located in the forward, deployed position (and the at least one leg is located in the forward, deployed position).
In further embodiments, the height of the handle, work surface and pair of cabinets is adjustable in relation to the legs. In yet further embodiments of the mobile structure, various accessories are attached thereto or adapted for interaction therewith. For example, storage boxes are attached to the frame to allow for the storage of portable power supply systems for the laptop computer, patient charts, or any other items therein. Other accessories include a storage base that allows for storage and transport of one or more mobile structures thereon.
The present invention is a mobile structure that is stowable and releasably securable to a wall or other rigid body to maximize floor space. As illustrated in
Referring to
The plurality of legs 35, located at the lower end 20 of the frame 10, provides support to the frame and remaining components of the mobile structure. The at least one leg 45 of the plurality is movable between a forward, deployed position 90 and a rearward, stowed position 95 in relation to the frame, while the remaining legs are preferably non-movable in relation thereto. The legs of the plurality 35 are comprised of any material capable of providing rigidity to support the frame and remaining components of the mobile structure. Such materials may include aluminum, stainless or other steels or metal alloys, carbon fiber composite materials, plastic, wood or any other material understood in the art as providing rigid support.
In the embodiments of the mobile structure illustrated herein (i.e.,
As further illustrated in the embodiment of
Referring again to both
In one embodiment, the at least one movable leg 45 may be moved between the deployed and stowed positions 90 and 95 by applying a force on the outer end of the leg to pivot it forwardly or rearwardly. For example, a user may use his or her hand or foot push or pull the respective outer end 120 or 125 of the leg 100 or 105 to move them between the deployed and stowed positions 90 and 95. In other embodiments of the mobile structure, a handle is operable to move the at least one movable leg between the deployed and stowed positions, with the handle located in a deployed position when the at least one movable leg is located in the deployed position, and a stowed position when the at least one leg is located in the stowed position. The handle is also operably associated with the interlock assembly, to be further discussed, to prevent its movement of the at least one movable leg to the stowed position when the mobile structure is not secured in the predetermined location.
In one embodiment, the handle comprises a protrusion, grip or tactile surface located on the outer end of the at least one movable leg such that a user can contact the it with his or her hand or foot to move the at least one movable leg between the deployed and stowed positions as described above. In other embodiments, the handle is located on the frame and acts as a lever to move the at least one movable leg between the deployed and stowed positions. As illustrated in
As illustrated in
In complying with certain occupational standards and/or regulations, it is desirable that the overall mobile structure, when in the stowed position, not exceed a given forward to rearward depth dimension. Such a depth dimension ensures that the components of the workstation, when in the stowed position, are out of the way of possible interference with personnel and/or other equipment. Thus, when the handle and legs of the mobile structure are located in their respective stowed positions in one embodiment, the mobile structure has a forward to rearward depth not exceeding about 12 inches, more preferably not exceeding a range of between about 8 inches and about 4 inches, and optimally not exceeding about 4 inches.
One embodiment of the mobile structure 5 includes the work surface 25 located on the frame 10. As illustrated respectively in
To facilitate such an operable association, the handle 160, as illustrated in
Referring to
In other embodiments of the mobile structure having a work surface, the work surface further includes a computer docking station to facilitate the electrical and/or data connection of the computer to the mobile structure. Such a docking station may comprise any number of products commercially available in the market place. To facilitate the electrical and/or data connection of the mobile structure and laptop computer to another destination, such as a hospital building, the mobile structure further includes an electrical and/or data port that connects the structure to the destination (i.e., to a wall of the hospital building). Like the docking station, such a port may comprise any number of products commercially available in the market place.
In further embodiments of the mobile structure having a work surface, the work surface is elongated such that it can span the width of a standard hospital bed. Similar to other embodiments of the work surface, the elongated work surface is movable between the lowered, deployed position and the raised, stowed position, and optionally limited in movement by the handle, as discussed in preceding paragraphs. To offset any moment created by the lengthened work surface when in the lowered, deployed position, the movable legs of the at least movable legs have a length proportional to that of the work surface, thus preserving the mobile structure's vertical stability when the legs are located in the forward, deployed position.
Referring to again to
In the embodiments illustrated herein, a plurality of drawers 335 or bins are located within the sleeves of each cabinet. A handle 340 is optionally located on the outer side 330 of each cabinet to facilitate movement of the cabinets between the deployed and stowed positions. Also, while the figures illustrate the cabinets as being accessible through either of the first or second openings, one or both of the openings may be closed via a wall, partition or door. For example a wall or door may be located across each cabinet's second opening 320 such that the drawers are inaccessible when the cabinets are in the forward, deployed position.
Again, in complying with certain occupational standards and/or regulations, it is desirable that the overall mobile structure, when in the stowed position, not exceed a given forward to rearward depth dimension. Such a depth dimension ensures that the components of the workstation, when in the stowed position, are out of the way of possible interference with personnel and/or other equipment. Thus, when the cabinets and legs of the mobile structure are located in their respective stowed positions in one embodiment, the mobile structure has a forward to rearward depth not exceeding about 12 inches, more preferably not exceeding a range of between about 8 inches and about 4 inches, and optimally not exceeding about 4 inches.
As illustrated in
In the embodiment of
Thus, the at least one movable leg is located in the rearward, stowed position when the handle is located in the raised, stowed position or when the pair of cabinets is in the rearward, stowed position. However, when the at least one movable leg is in the rearward stowed position, the structure's footprint is reduced, possibly leading to vertical instability. Thus, for the at least one leg to be in the rearward, stowed position, the mobile structure must be removably secured in a predetermined location against a rigid body, such as a wall, via the interlock assembly.
In addition to releasably securing the mobile structure in a predetermined location, the at least one interlock assembly is operably associated with the at least one movable leg to prevent movement of the leg to the stowed position when the mobile structure is not secured in the predetermined location, and further to prevent the at least one interlock assembly from releasing the structure from the predetermined location when the at least one movable leg is in the stowed position. In further respective embodiments, the handle and pair of cabinets of respective mobile structure embodiments are operably associated with the at least one interlock assembly to prevent their respective movement of the leg to the stowed position when the mobile structure is not secured in the predetermined location.
As illustrated in
The forward planar surface 405 of the plate preferably has the projection 400 protruding there-from, with the projection adapted for engagement with the interlock sub-assembly 385. The projection preferably defines a rectangular “u-shaped” member oriented with the plate such that the open-ended, top of the “u-shape” abuts the plate at two points and the bottom of the “u-shape” is displaced from the plate and vertically oriented therewith. The “u-shaped” member is attached to the plate via any means understood in the art, to include welds, threaded engagement with nuts, or any other means known in the art. Thus, when the plate 395 of the bracket 390 is attached to a rigid body such as a wall, the projection 400 of the bracket protrudes outwardly in a substantially vertical orientation for engagement with the interlock sub-assembly 385 of the frame 10.
To facilitate such an operable association, the housing of the interlock sub-assembly further comprises a clasp 485 and a pinion 490. While
Referring again to
For the clasp 485 to pivot in an open-ward direction in response to an insertion of the bracket's projection 400 into the housing's void 455, the recess 530 of the vertical drive shaft 205 must be aligned with the stay 520 of the clasp such that the stay can pivot into the recess. The recess 530 is located on the vertical drive shaft 205 such that it is rotationally aligned with the stay 520 of the clasp only when the at least one movable leg, connected to the lower end of the shaft, is in the deployed position. When the at least one movable leg is moved to the stowed position, the recess 530 will be moved out of alignment with the stay 520 of the clasp such that the clasp can no longer pivot in an open-ward direction because the stay now interferingly abuts the outer surface 535 of the vertical shaft.
Referring again to
The pawl 540 of the pinion interacts with a tooth 555 projecting from the outer surface 535 of the vertical drive shaft. With the pinion 490 located in the closed position such that the pawl 540 is in contact with the outer surface 535 of the vertical drive shaft, the pawl engages the tooth 555 of the drive shaft to prevent a rotation of the drive shaft, thus preventing a movement of the at least one movable leg, connected at the lower end of the shaft, to the stowed position. With the pinion 490 located in the opened position such that the pawl 540 is displaced from the tooth 555 and outer surface 535 of the vertical drive shaft, the drive shaft is free to rotate to allow movement of the at least one movable leg to the stowed position.
It is noted that the pawl 540 of
The movement of the projection 400 to the stop of the void 455 also causes the rest 545 pinion 490 to contact the projection (
Thus, via the foregoing operable association of the sub-assembly with the vertical drive shaft and bracket, the at least one movable leg of the mobile structure cannot be moved to the rearward, stowed position unless the mobile structure is engaged with the bracket. Similarly, the mobile structure cannot be disengaged from the bracket unless the at least one movable leg is located in the forward, deployed position. However, if the at least one movable leg is in the stowed position while the mobile structure is not engaged with the bracket, the leg may be moved to the deployed position without the structure having to engage the bracket.
For embodiments of the mobile structure utilizing a movable handle, because of the operable association of the sub-assembly with the vertical drive shaft and bracket, and because of the operable association of the handle with the at least one movable leg via the drive shaft, the handle of the mobile structure cannot be moved to the raised, stowed position, (and the at least one movable leg thus cannot be moved to the rearward, stowed position) unless the mobile structure is engaged with the bracket. Similarly, the mobile structure cannot be disengaged from the bracket unless the handle is in located the lowered, deployed position (and the at least one leg is located in the forward, deployed position).
However, if the handle is located in the raised, stowed position (and the at least one movable leg is located in the rearward, stowed position) while the mobile structure is not engaged with the bracket, the handle may be moved to the lowered, deployed position (and the at least one movable leg moved to the forward, deployed position) without the structure having to engage the bracket. Also, while the handle may remain in the raised, stowed position (and the at least one movable leg in the rearward, stowed position) when the mobile structure is secured to the wall or other rigid body, the planar work surface may be moved to the lowered, deployed position.
For embodiments of the mobile structure utilizing a pair of cabinets, because of the operable association of the sub-assembly with the vertical drive shaft and bracket, and also because of the operable association of the pair of cabinets with the at least one movable leg via the drive shaft, the cabinets of the mobile structure cannot be moved to the rearward, stowed position (and the at least one movable leg thus cannot be moved to the rearward, stowed position) unless the mobile structure is engaged with the bracket.
Similarly, the mobile structure cannot be disengaged from the bracket unless the pair of cabinets are located in the forward, deployed position (and the at least one leg is located in the forward, deployed position). However, if the pair of cabinets is located in the rearward, stowed position (and the at least one movable leg is located in the stowed position) while the mobile structure is not engaged with the bracket, the pair may be moved to the forward, deployed position (and the at least one movable leg moved to the forward, deployed position) without the structure having to engage the bracket.
For releasably securing the mobile structure in a predetermined location via the interlock assembly, the bracket of the interlock assembly is adapted for attachment to a rigid body such as a wall, another mobile structure, a storage base, or other rigid body. With regard attachment of the bracket to another mobile structure (not illustrated), the bracket is preferably attached to a forward surface of the frame such that the projection of the bracket is directed forwardly. The forwardly direction of the projection thus allows for its operable association with the interlock sub-assembly of another mobile structure, accessible through the rear surface of the other structure's frame, to thus allow a plurality of mobile structures to be releasably secured to one another in a “nested” or “front-to-back” relation.
While the bracket of the interlock assembly is adapted for attachment to a rigid body such as a wall, another mobile structure, a storage base, or other rigid body, it is understood that the bracket need not be attached to any such rigid body to facilitate the interlock assembly's operation. For example, the bracket may comprise a portable key, not attached to a rigid body, whereby the key's projection may be inserted into the void of any interlock sub-assembly for the sake of allowing for the movement of the mobile structure's at least one leg, and/or handle or pair of cabinets, to the stowed position when not located in the predetermined location.
Referring again to
As illustrated in
In embodiments having the handle and pair of cabinets operably associated with the at least one movable leg, the vertical drive shaft is located inwardly of both the upper and lower columns and thus must also accommodate for the movement of the column in relation to the lower column. As illustrated in
Referring to
In the embodiment illustrated in
In further embodiments of the mobile structure 5, various accessories are attached thereto or adapted for interaction therewith. For example, as illustrated in
Other accessories include a storage base that allows for storage and transport of one or more mobile structures thereon. In one embodiment illustrated in
The chassis 655, substantially upright to define the upper and lower ends, is comprised of any material capable of providing rigidity to support the remaining components of the base. Such materials may include aluminum, stainless or other steels or metal alloys, carbon fiber composite materials, plastic, wood or any other material understood in the art as providing rigid support. The elongated members 670 and 675, adapted to support at least one movable structure 5 thereon, are attached to the chassis 655 via weld, nuts and bolts, screws, or other means known in the art. Like the chassis, the members are comprised of aluminum, stainless or other steels or metal alloys, carbon fiber composite materials, plastic, wood or any other materials understood in the art as providing rigid support.
The elongated members 670 and 675 of the pair are in spaced relation with one another to define a gap 685 there-between, with the gap adapted to accept an insertion of the mobile structure's frame 10 there-in. Each member of the pair defines an upper surface 690 adapted for contact with the lower surface 230 and/or the rear edge 240 of the mobile structure's work surface 25. The members may each define a chamfer at a leading edge 695 thereof to facilitate a loading of the lower surface and/or rear edge of the mobile structure's work surface thereon. Thus, when supporting one or more mobile structures, the at least one mobile structure is located on the base such that the pair of elongated members 670 and 675 support the lower surface 230 and/or rear edge 240 of the structure's work surface, with the frame 10 of the structure located between the members. Multiple structures can thus be supported by the base in this fashion, with the structures located front-to-back relation with one another in their stowed configuration.
In further embodiments, the elongated members 670 and 675 of the pair are also adapted for operable relation with a plurality of retainers 700. To facilitate such an operable relation, an array of inlets 705 is defined along the length of each member in the respective upper surface 690 thereof. Each inlet along the length of a given member is located in paired relation with a corresponding inlet of the other member to thus define an inlet pair adapted for operable relation with the retainer. The retainer defines an elongated, inverted “u-shape” having its downwardly directed ends 710 adapted for insertion into the paired inlets. When a plurality of retainers is inserted into the respective paired inlets, the retainers spans the gap defined between the pair of elongated members to secure, in spaced relation with one another, the respective frames of a plurality of mobile structures supported along the elongated members. Other embodiments include the bracket 390 attached to the chassis 655, in addition to the retainers or in substitution of the retainers, for releasably securing at least one mobile structure 5 thereto via the interlock sub-assembly. Such mobile structures may be further secured to one another in nested relation via the interlock assembly as described herein.
The support 680 of the base is located at a lower end of the chassis and is attached to the chassis via weld, nuts and bolts, screws, or other means known in the art. Like the chassis and elongated members, the base is comprised of aluminum, stainless or other steels or metal alloys, carbon fiber composite materials, plastic, wood or any other materials understood in the art as providing rigid support. In the embodiment of the base illustrated in
In another embodiment illustrated in
The support 680 of the base 650 of
While the foregoing embodiment of
In use, the mobile structure is maneuvered into proximity with a bracket attached to the rigid body. The rigid body that the bracket is attached to may comprise a wall, another mobile structure, a base or any other rigid body. After aligning the interlock sub-assembly of the frame with the bracket, the mobile structure is pushed against the bracket such that the interlock sub-assembly engages the bracket. The at least one movable leg is thereafter moved from a deployed position to a stowed position, with the location of the at least one leg in the stowed position preventing a removal of the interlock sub-assembly from the bracket.
When a disengagement of the mobile structure from the bracket is desired, the at least one movable leg is moved from the stowed position to the deployed position, with the location of the at least one movable leg in the deployed position allowing for a removal of the interlock sub-assembly from the bracket. The mobile structure is thereafter pulled away from the bracket such that the interlock sub-assembly disengages from the bracket. The mobile structure is thereafter maneuvered out of proximity with the bracket.
For embodiments of the mobile structure utilizing a handle, the handle is moved from lowered, deployed position to the raised, stowed position, after the interlock sub-assembly is engaged with the bracket, to move the at least one movable leg from the forward, deployed position to the rearward, stowed position. When a disengagement of the mobile structure from the bracket is desired, the handle is moved from the raised, stowed position to the lowered, deployed position to move the at least one movable leg from the rearward, stowed position to the forward, deployed position.
If the handle is operably related to the work surface, a movement of the work surface from the lowered, deployed position to the raised, stowed position will also raise the handle from its lowered, deployed position to its raised, stowed position. However, a lowering of the work surface from the raised, stowed position to the lowered, deployed position will not also cause the handle to move to its respective lowered, deployed position.
For embodiments of the mobile structure a pair of cabinets, the pair of cabinets is moved from the forward, deployed position to the rearward, stowed position, after the interlock sub-assembly is engaged with the bracket, to move the at least one movable leg from the forward, deployed position to the rearward, stowed position. When a disengagement of the mobile structure from the bracket is desired, the pair of cabinets is moved from the rearward, stowed position to the forward, deployed position to move the at least one movable leg from the rearward, stowed position to the forward, deployed position.
While this foregoing description and accompanying figures are illustrative of the present invention, other variations in structure and method are possible without departing from the invention's spirit and scope.