Multi-positional sawhorse device

Abstract

An adjustable leg, collapsible sawhorse, wherein roller-style attachments are secured to multi-jointed, pivotable arms that are slidably related to the sawhorse support structure, wherein the roller-style attachments facilitate upload, support, cut and offload of a large workpiece, such as a 4′×8′ sheet of plywood, by a single person, and wherein the roller-style attachments hang unobstructively below the sawhorse support surface when not in use.

Description

TECHNICAL FIELD

The present invention relates generally to sawhorse devices and, more specifically, to a multi-positional sawhorse device enabling a single user to upload, support, cut, and offload large sheets of wood via multi-positional support members.

BACKGROUND OF THE INVENTION

Home repair and home renovation projects and improvements continue to be popular tasks for many, notwithstanding the multitude of tools required and the frequently cumbersome and heavy building materials. Unfortunately, many do-it-yourselfers are relegated to limited work areas and often realize limitations in the diversity of materials that can be utilized without the assistance of another individual. Construction workers, too, face similar challenges, wherein efficiency is constrained by the necessity for more than one worker for a given task.

Sawhorses are one means by which one engaged in construction activities can support an oversized workpiece, such as during sawing or drilling. Sawhorses are especially convenient because they are frequently foldable, and thus portable and easily storable, rendering sawhorses beneficial to many users. Nonetheless, limitations to the benefits remain. For example, if a large (such as 4′×8′) piece of plywood is to be extended between two sawhorses for work thereon, typically one individual cannot accomplish placement for such a task, wherein at least two people are required to lift the wooden sheet up and over the sawhorses, and then to lower the board to the support surfaces thereof. Further, upon sawing down the middle of such a wooden sheet supported in such a position, the sheet separates and, without further support from one or more individuals or additional devices, necessarily falls, creating a potentially dangerous situation following completion of the cut.

Sawhorses have been proposed to enable easier manipulation of workpieces supported thereon. Some such devices include upwardly extending roller arm(s), including some that may be positioned either parallel or perpendicular relative to the upper support edge of the sawhorse. In view of the present invention, however, such sawhorses are disadvantageous because users are denied the use of the full sawhorse support rail in order to benefit from the roller attachment, wherein the roller must receive the entire force of the workpiece. In another type of sawhorse device, a roller is angularly disposed along a side edge of the sawhorse in order to enable benefit from the roller during loading and unloading, yet without preventing use of the sawhorse upper support surface. Others offer free-standing rollers in an effort to enable the beneficial use of a roller in cooperation with full sawhorse support. Still, however, these roller and sawhorse combinations are disadvantageous in view of the present invention, and none offer a selectable means for supporting the cutting edge following completion of the cut.

Therefore, there is a need for a multi-positional sawhorse device enabling a user to mount, store and utilize a plurality of adjustable roller arms on a foldable, height adjustable sawhorse support base, wherein each roller arm is adapted for use on either side of the sawhorse, wherein each roller arm is slidably adjustable along the length of the sawhorse, and wherein convenience features such as on-board power and tool organizers facilitate overall ease of use, thus preventing the above-discussed disadvantages.

BRIEF SUMMARY OF THE INVENTION

Briefly described, in a preferred embodiment, the present invention overcomes the above-mentioned disadvantages and meets the recognized need for such a device by providing an adjustable leg, collapsible sawhorse, wherein roller-style attachments are secured to multi-jointed, pivotable arms that are slidably related to the sawhorse support structure, wherein the roller-style attachments facilitate upload, support, cut and offload of a large workpiece, such as a 4′×8′ sheet of plywood, by a single person, and wherein the roller-style attachments hang unobstructively below the sawhorse, support surface when not in use.

According to its major aspects and broadly stated, the present invention is a configurable sawhorse with a dual-track mount system installed lengthwise on the underside of the sawhorse support surface, wherein accessories may be mounted to the sawhorse to facilitate convenient use thereof, and wherein such accessories may include a multi-segment, dual-locking-joint pivotable arm with a 180° range of motion relative to the sawhorse mount, and a further 180° range of motion of one arm segment relative to another arm segment, such that a multitude of adjustably selectable positions is available for the pivotable arm and the roller feature provided thereon.

More specifically, the present invention in its preferred form is a multi-positional sawhorse device, wherein a length-adjustable elongate support member extends between two pairs of extendable legs, and wherein roller arms are pivotably and slidably related to the elongate support member for additional support of workpieces therewith. The length-adjustable elongate support member is defined by two outer support members, with an inner support member housed therewithin and adjustably therebetween, wherein the degree of exposure of the inner support member relative to the respective outer support members determines the overall length of the elongate support member of the sawhorse.

The underside of each outer support member is adapted with a mounting track, wherein track-adapted brackets may be slidably mounted therein, and adjustably positioned, preferably along the length of the elongate support member. Each roller arm is pivotally secured to a track-adapted bracket, and is installed with each roller capable of an orientation parallel to the elongate support member of the sawhorse. Each roller arm may simply hang in a downward direction during non-use, or may be pivotably extended in either direction relative to the elongate support member of the sawhorse. A similarly pivotal hinge enables selectable movement of the roller, via an extension arm, relative to the roller arm.

Each of the foregoing adjustable features is easily lockable following selection, via snap-style buttons. Additionally, the tension of the roller is also adjustable, via an onboard tension selector. Further features include a non-slip support surface and non-slip feet, and a foldable, cross-support arm for extension between the legs. Additional optional features include an attachment plate for a table saw, such as a contractor saw or miter saw, a power strip for on-board AC power for accessories, and organizational hangers for tools.

A feature and advantage of the present invention is the ability of such a device to enable a single user to upload, support, cut, and offload large sheets of wood.

Another feature and advantage of the present invention is the ability of such a device to enable a user to quickly, easily, and selectively position the device and the onboard accessories.

Yet another feature and advantage of the present invention is the ability of such a device to provide a track/mount system for ease of attachment of a variety of accessories, machines and/or power tools.

Still another feature and advantage of the present invention is the ability of such a device to provide easily accessible on-board electrical power.

Another feature and advantage of the present invention is the ability of such a device to enable securely locked positioning following selective placement and arrangement of features and accessories.

Yet another feature and advantage of the present invention is the ability of such a device to enable height and clearance selections, thereby facilitating use in a plurality of locations and environments.

Still another feature and advantage of the present invention is the ability of such a device to offer a selectable plurality of roller arms that may be positioned at any location along the length of the sawhorse, that are adapted for use on either side of the sawhorse, and that may be adjusted for use above, within, or below the plane of the sawhorse support surface.

Still yet another feature and advantage of the present invention is the ability of such a device to provide on-board roller supports that pivotally store below the work surface during periods of non-use.

Yet still another feature and advantage of the present invention is the ability of such a device to provide a multi-segment, dual-locking-joint pivotable arm with a 180° range of motion relative to the sawhorse mount, and a further 180° range of motion of one arm segment relative to another arm segment, such that a multitude of adjustably selectable positions is available for the pivotable arm and the roller feature provided thereon.

Still another feature and advantage of the present invention is the ability of such a device to enable selective adjustment of the length of the elongate sawhorse support member.

Another feature and advantage of the present invention is the ability of such a device to increase safety by including features such as a non-slip support surface and non-slip feet.

Still another feature and advantage of the present invention is the ability of such a device to be collapsed, folded and stored in a minimal space.

Yet another feature and advantage of the present invention is the ability of such a device to function as a table saw out-feed extension, or as a contractor saw stand.

Yet another feature and advantage of the present invention is the ability of such a device to be constructed of aluminum, thereby providing strength in a lightweight fashion, and without risk of rust.

Still another feature and advantage of the present invention is the ability of such a device to adjust for a level work surface on all types of terrain.

These and other objects, features and advantages of the invention will become more apparent to one skilled in the art from the following description and claims when read in light of the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will be better understood by reading the Detailed Description of the Preferred and Alternate Embodiments with reference to the accompanying drawing figures, in which like reference numerals denote similar structure and refer to like elements throughout, and in which:

FIG. 1 is a side view of a multi-positional sawhorse device according to a preferred embodiment of the present invention;

FIG. 2 is an partially enlarged end-view of a multi-positional sawhorse device according to a preferred embodiment of the present invention, showing the multi-positional support arm in an enlarged configuration relative to the sawhorse support, and showing the multi-positional support arm in a work position;

FIG. 3 is an end view of two multi-positional sawhorse devices in cooperative use;

FIG. 4 is a side view of the multi-positional support arm of FIG. 2;

FIG. 5A is an overhead view of a multi-positional sawhorse device according to a preferred embodiment of the present invention, showing a first configuration for attachment of two multi-positional support arms;

FIG. 5B is an overhead view of a multi-positional sawhorse device according to a preferred embodiment of the present invention, showing a second configuration for attachment of two multi-positional support arms;

FIG. 5C is an overhead view of a multi-positional sawhorse device according to a preferred embodiment of the present invention, showing a third configuration for attachment of two multi-positional support arms;

FIG. 5D is an overhead view of a multi-positional sawhorse device according to a preferred embodiment of the present invention, showing a configuration for attachment of four multi-positional support arms;

FIG. 6 is an end view of a multi-positional sawhorse device according to a preferred embodiment of the present invention, showing the device in an unfolded, use position with the multi-positional support arm in a storage position;

FIG. 7 is an end view of a multi-positional sawhorse device according to a preferred embodiment of the present invention, showing the device in a folded, storage position;

FIG. 8 is a partial, perspective view of the underside of a multi-positional sawhorse device according to a preferred embodiment of the present invention, showing the track with an accessory bracket therein;

FIG. 9 is a side view of two multi-positional sawhorse devices in cooperative use supporting a power tool;

FIGS. 10A-C are partial, perspective views of means for affixing support plate to two or more sawhorse devices; and

FIGS. 11A-C are top views of two multi-positional sawhorse devices in cooperative use with a support plate for a power tool.

DETAILED DESCRIPTION OF THE PREFERRED AND ALTERNATE EMBODIMENTS

In describing the preferred and alternate embodiments of the present invention, as illustrated in the figures and/or described herein, specific terminology is employed for the sake of clarity. The invention, however, is not intended to be limited to the specific terminology so selected, and it is to be understood that each specific element includes all technical equivalents that operate in a similar manner to accomplish similar functions.

Referring now to FIGS. 1-2, the present invention in its preferred form is multi-positional sawhorse device 10, generally comprising length-adjustable elongate support member 20, extendable legs 50, and plurality of pivotable roller arms 100. Preferably, length-adjustable elongate support member 20 is two outer support members 22a and 22b, with inner support member 24 housed therewithin, and adjustably therebetween.

That is, each outer support member 22a and 22b preferably defines the exterior parallelepiped shape of a traditional sawhorse support member, but with a hollow interior that is shaped to slidably receive inner support member 24 therewithin. It is preferred that a plurality of apertures 26 are defined in each outer support member 22a and 22b, and that spring-loaded locking members 28 are provided on the surface of inner support member 24 so that easy lockable positioning of inner support member 24 relative to outer support members 22a and 22b may be quickly and easily selected via extension of spring-loaded locking members 28 through plurality of apertures 26. It should be understood, however, that although such a configuration is preferred, other locking systems could be utilized, such as, for exemplary purposes only, locking pins or bolts, and further that such locking system could be defined on outer support member 22a, 22b or inner support member 24, or in any suitable cooperative relationship therebetween.

Although this configuration, as described herein and depicted in FIG. 1, is preferred, the dimensions represented are exemplary and without limitation. Nonetheless, it is preferred that device 10 is length-adjustable between a minimum length of thirty inches and a maximum length of forty-eight inches. This adjustability is preferably achieved by the relationship of a twenty-eight inch length for inner support member 24, and a fifteen inch length for each outer support member 22a and 22b. In such an exemplary configuration, device 10 may be selectively utilized with a thirty inch support length when inner support member 24 is fully held within outer support members 22a and 22b; device 10 may also be selectively utilized with a forty-eight inch support length when inner support member 24 is maximally exposed, with five inches of inner support member 24 supported within each outer support member 22a and 22b. Again, this preferred configuration is exemplary and without limitation, wherein essentially any length could be utilized for length-adjustable, elongate support member 20 of device 10. Further, elongate support member 20 may be covered or “topped” with non-slip surface 30.

Extendable legs 50 preferably pivotally link to each side of elongate support member 20, proximate each end thereof. Referring now to FIG. 3, the extended configuration for one exemplary pair of extendable legs 50 is depicted for each device 10, with one extendable leg 52a on a first side of elongate support member 20, another extendable leg 52b on the other side of elongate support member 20, and with pivotal cross-support member 54 extending therebetween. This “A”-shaped support configuration is preferred for each end of device 10.

Inner telescoping leg 56 adjustably positions within each extendable leg 50 in order for overall height of device 10 to be adjusted, wherein the individual adjustability of each leg allows for accommodation of rough and/or uneven terrain while maintaining a level support/work surface. Preferably, one or more spring-loaded lock buttons 58 is provided proximate each extendable leg 50 and inner telescoping leg 56 in order to fix the extended position of the leg 50 following selection thereof. A plurality of spring-loaded lock buttons 58 are preferably included in order to enable a plurality of selectable extensions for inner telescoping leg 56 relative to extendable leg 50. Additionally, each extendable leg 50 preferably carries non-slip foot treatment 60, such as a rubber foot, rough textured surface, or the like.

Preferably, plurality of pivotal roller arms 100 includes two or more pivotal roller arms 100, wherein each roller arm 100 is defined by pivot bracket 102, first arm extension 104, second arm extension 106, and roller mount 108, as shown in FIG. 2. Pivot bracket 102 facilitates pivotal movement of each roller arm 100 relative to elongate support member 20, but more specifically facilitates pivotal movement of first arm extension 104 relative to pivot bracket 102, preferably in a 180° manner. Plurality of spring-loaded buttons 110 is preferably defined on pivot bracket 102, wherein selective pivotal movement of first arm extension 104 relative to pivot bracket 102 allows for selection of an easily lockable position for first arm extension 104 relative to elongate support member 20. In the preferred configuration, selectable, lockable configurations include opposing extensions perpendicular to elongate support member 20, and a third extension essentially hanging below elongate support member 20, such as for storage.

Proximate roller mount 108, roller 112 is secured in a manner that preferably allows for tension adjustment thereof via selector knob 114 on second arm extension 106. In the preferred configuration, second arm extension 106 is pivotally movable relative to first arm extension 104, wherein selection of easily lockable positions is preferably facilitated by plurality of spring-loaded buttons 116 and related lock aperture 118 of second arm extension 106. In this preferred configuration, selectable lockable configurations include opposing extensions perpendicular to first arm extension 104, and a third extension essentially co-planar with first arm extension 104.

Referring now to FIG. 8, elongate support member 20 preferably includes two parallel lengths of support track 150, wherein groove 152 is shaped to slidably receive t-shaped attachment member 166 of pivot bracket 102, or a suitably shaped attachment member 166 extending therethrough. In an alternate embodiment, groove 152 is shaped to slidably receive bolt 164 extending therethrough pivot bracket 102 and pivot bracket 102 is secured in position to elongate support member 20 by rotationally movement of tension knob 162. As noted hereinabove, other accessories may be similarly slidably related and supported by device 10, as desired. Also, it should be noted that device 10 could be made with fewer or more than two lengths of support track 150, although two is preferred. Moreover, device 10 could be made without support track 150, wherein each roller arm 100 could be fixedly or otherwise secured to elongate support member 20. However, the preferred slidable positioning of each pivot bracket 102 within support track 150 enables specific selection of placement for each roller arm 100 for each job, if desired. This feature, coupled with the multi-positional pivot features provides for maximum adjustability of each roller arm 100 relative to elongate support member 20.

In use, device 10 may support a workpiece via plurality of rollers 100 in a plurality of selectable conformations. Some exemplary formations are depicted in the figures, wherein FIG. 5A, for example, depicts both of two roller arms 100 positioned on a first same side of elongate support member 20. FIG. 5B depicts both of two roller arms 100 positioned on a second same side of elongate support member 20; FIG. 5C depicts each of two roller arms 100 positioned on opposing sides of elongate support member 20; and FIG. 5D depicts all of four roller arms 100 positioned on a same side of elongate support member 20. The foregoing are, of course, exemplary conformations only, wherein other additional conformations are possible. Further, it should be noted that it is possible to adjust each roller arm 100 in order to be extended below the plane of the upper surface of elongate support member 20, to be coplanar with the upper surface of elongate support member 20, and/or to be extended above the plane of the upper surface of elongate support member 20, thereby enabling specific selection according to workpiece requirements. This allows for selective placement to support a workpiece during sawing, and thereafter to prevent falling of the cut workpiece.

It is contemplated herein that device 10 may utilize one or more adjustable and pivotal roller arms 100 enabling a versatile sawhorse that supports various work pieces B and enables a single operator to load and/or unload boards or other material or work pieces B onto device(s) 10 utilizing roller arm(s) 100 and further support work pieces B while work pieces B is in use or being engaged.

Preferably, during periods of non-use, such as depicted in FIG. 6, roller arm 100 is positioned to hang vertically below elongate support member 20, wherein elongate support member 20 may remain available for use without roller arm 100. For storage, pivotal cross-support member 54 may be unlatched and pivoted into alignment with either extendable leg 52a or 52b, as appropriately provided, and each extendable leg 52a and 52b may be pivoted inwardly in order to conveniently store device 10 in a small, space-limited environment with attachments, such as roller arms 100, hanging vertically below the horizontal sawhorse member, elongate support member 20.

In an alternate embodiment, although each roller arm 100 is depicted with box-like, it should be noted that tubular extension members could also be utilized for roller arms 100, as well as any other suitable shape.

In another alternate embodiment, elongate support member 20, depicted in FIG. 10 A-C, further includes a plurality of prefabricated rings, slots, or tubes (shown as a tube) 55 for receipt of hook or pin (shown as a pin) 57 in order to facilitate secure placement of attachment plate 59 to elongate support member 20. Attachment plate 59 preferably constructed of heavy gauge aluminum or steel further includes a plurality of prefabricated rings, slots, or tubes (shown as a tube) 56 for receipt of said hook or pin (shown as a pin) 57 in order to facilitate secure placement of attachment plate 59 to elongate support member 20 (shown engaged in FIG. 10B). Such a design allows for a stable and secure platform for working and placement of power tools such as a contractor saw, chop saw, miter saw or other power tools 62 (shown in FIG. 9), too, can similarly be attached or placed on attachment plate 59. It is contemplated herein that other means of affixing attachment plate 59 to elongate support member 20 are known to one of ordinary skill in the art.

Referring to FIG. 9 two devices 10 are shown from a side view, wherein attachment plate 59 preferably is securely affixed to elongate support members 20L and 20R, and thus, attachment plate 59 securely holds two devices 10 an equal distance apart from each other. Miter saw 62 can be positioned or secured to attachment plate 59 (as shown in FIG. 11) between elongate support members 20L and 20R. Further, one or more pivotal roller arms 100L and 100R, shown positioned on opposite sides of elongate support member 20L and 20R preferably position rollers 112 vertically along a horizontal line L running from roller 112 of roller arm 100L to non-slip surface 30 of elongate support members 20L to miter saw's 62 cutting surface 64 to non-slip surface 30 of elongate support members 20R to roller 112 of roller arm 100L. In use, two devices 10 configured in this way or as otherwise shown herein enable a single operator to load board or other material or work piece B onto device(s) 10 utilizing roller arm(s) 100 and two devices 10 enable a single operator to safely feed board B across non-slip surface 30 of support member 20L and 20R, and miter saw's 62 cutting surface 64 to power tool 62.

Referring to FIG. 11 A-C, in yet another alternate embodiment, device 10 may further be adapted using attachment plate 59 to link and/or support two or more devices 10 together to increase or configure various work areas having a variety of adjustable and pivotal roller arms 100 enabling a versatile sawhorse that supports various work pieces B and/or enables an operator to safely load and unload work pieces B and/or enable hands free operation of various power tool 62.

In yet another alternate embodiment, device 10 may further be adapted with an on-board power strip (not shown) for powering a variety of accessories, and/or may be adapted with organizational hangers for tools or the like, including but not limited to hooks, pegboard-style receptacles, and removable containers.

In still another alternate embodiment, elongate support member 20, or other portions of device 10, could carry reference markings thereon for measurements or conversion data.

In yet another alternate embodiment, extendable leg members 50, in lieu of telescoping inner and outer members, could each have two parallel members with relative selectable height adjustability, or could be rotationally related, wherein by twisting, the overall length could be adjusted.

In still yet another alternate embodiment, roller mount 108 or second arm extension 106 could support other accessories or tools in lieu of roller 112.

Having thus described exemplary embodiments of the present invention, it should be noted by those skilled in the art that the within disclosures are exemplary only, and that various other alternatives, adaptations, and modifications may be made within the scope of the present invention. Accordingly, the present invention is not limited to the specific embodiments illustrated herein, but is limited only by the following claims.

Claims

1. A multi-positional sawhorse device, comprising:

an elongate support member;

two pairs of legs carried by said elongate support member; and

at least one roller arm carried by said elongate support member and capable of bi-directional pivotal extension relative to the length of said elongate support member.

2. The sawhorse device of claim 1, wherein said two pairs of legs further comprise length-adjustment features.

3. The sawhorse device of claim 1, wherein each said pair of said two pairs of legs further comprises a cross-support arm pivotally carried by one said leg of each said pair, wherein said two pairs of legs are pivotally carried by said elongate support member, and wherein each said cross-support arm is adapted to extend between and support one said pair of legs in a triangular configuration.

4. The sawhorse device of claim 1, wherein each said at least one roller arm is adjustably carried relative to the length of said elongate support member.

5. The sawhorse device of claim 1, wherein each said at least one roller arm further comprises positional locking features, wherein said bi-directional pivotal extension of each said at least one roller arm is selectively lockable, and wherein selectable positions comprise a first position perpendicular to the length of said elongate support member, a second position also perpendicular to the length of said elongate support member but opposingly directed relative to said first position, and a third position also perpendicular to the length of said elongate support member but extending therebelow and also perpendicular to said first and second positions.

6. The sawhorse device of claim 4, wherein said elongate support member further comprises an upper support surface, an underside, and at least one track carried coincident with the length thereof proximate said underside, and wherein said sawhorse device further comprises at least one accessory slidably carried within said at least one track.

7. The sawhorse device of claim 1, wherein said bi-directional pivotal extension of each said at least one roller arm relative to the length of said elongate support member is facilitated by a first arm length carried by said elongate support member, wherein each said at least one roller arm further comprises a second arm length pivotally carried by said first arm length, and wherein said second arm length is bi-directionally pivotal relative to the length of said first arm length.

8. The sawhorse device of claim 7, wherein said first arm length of each said at least one roller arm is adapted to pivot within at least a 180° range of motion relative to said elongate support member and wherein said second arm length of each said at least one roller arm is adapted to pivot within at least a 180° range of motion relative to said first arm length.

9. The sawhorse device of claim 1, wherein said elongate support member further comprises length adjustable features defined by two outer support members and an inner support member extendably housed therewithin, wherein a selected extension of said inner support member is positionally lockable.

10. The sawhorse device of claim 1, wherein each said adjustable feature is locked via at least one resilient, friction fit button.

11. The sawhorse device of claim 1, wherein each said at least one roller arm further comprises a roller tension-adjustment mechanism.

12. The sawhorse device of claim 1, wherein said elongate support member further comprises a slip-resistant support surface and wherein each said leg further comprises a slip-resistant foot.

13. The sawhorse device of claim 6, wherein said at least one accessory is selected from the group consisting of a roller arm and an attachment plate for a table saw, contractor saw, or miter saw.

14. The sawhorse device of claim 1, further comprising an on-board power outlet.

15. The sawhorse device of claim 1, further comprising organizational hangers for tools.

16. The sawhorse device of claim 1, wherein each said at least one roller arm can pivot and lock into a plurality of positions relative to said elongate support member, wherein said plurality of positions further comprise positions on either side relative to the length of said elongate support member and above, within, and below the plane of an upper surface of said elongate support member.

17. The sawhorse device of claim 2, wherein said length adjustable features of each said leg of said two pairs of legs further comprise an inner leg telescopingly related to an outer leg, wherein the selected positional relationship of said inner and outer legs is lockable.

18. The sawhorse device of claim 6, further comprising at least one bracket adapted for slidably lockable positioning relative to said at least one track, wherein said at least one accessory is said roller arm, and wherein said at least one roller arm is carried by said at least one bracket.

19. The sawhorse device of claim 6, further comprising two said tracks in a parallel relationship and further comprising two roller arms adjustably positioned within each said track.

20. A sawhorse device, comprising:

a length-adjustable elongate support member;

two pairs of length-adjustable legs pivotally carried by said elongate support member;

at least one mount track carried proximate an underside of said elongate support member;

at least one bracket slidably and lockably positioned within said at least one mount track; and

at least one jointed roller arm pivotally carried by said at least one bracket at a first end, with a roller at a second end, and with a pivotal joint therebetween.