Folding table
Folding table having a fastener to releasably hold each of one or more legs, rigidly attatched to a rotational leg supportive structural shaft parallel and adjacent to the underside of the table. The legs can be fastened or unfastened into/from an erect position by a rotational leverage force applied to the leg. The fastener provides a manually breakable and engagable grip between two surfaces being fastened to each other. The primary resistance of such a table against collapse is due to the limit of the legs' opening rotational travel, the frictional force of the floor on the legs, and the rotational sets of table legs being configured substantially oppositely. In a four-legged rectangular table configuration, when using such fasteners, each pair of legs is rigid in the opposite direction, providing overall table rigidity. Also encompassed is a variation permitting non-releasing leg latching, including a latch release mechanism.
This invention is related to a folding table construction, and more specifically a table leg locking mechanism for securing at least one table leg in an erect supportive position from a folded position against and parallel to the underside of the table.
BACKGROUND ARTNumerous technical solutions are known in the field of folding tables. From U.S. Pat. No. 4,064,815 is known a table leg locking mechanism, which locks joined pairs of table legs in either their supportive or their folded positions at their cross member. The locking mechanism includes a pivot mount situated within a rectangular housing attached to the underside of the table. This locking mechanism consists of a pair of sleeves mounted on a tubular cross member, such that one sleeve is welded, or in some other manner securely united to its associated housing, and the other sleeve is rigidly united to the tubular cross member. A spring is connected to the tubular cross member whereby constant pressure is exerted between the two sleeves, one against the other, to insure locking of the table legs into position. The sleeves are interlocked together by virtue of their shape, in which one of the sleeves has wedge-shaped protrusions on its end, conforming to matching wedge shaped notches in the adjoining end of the other sleeve. There is one lock for each united pair of legs at each end of the table. The resulting table construction does not achieve the elegant slimness and light weight preferred in folding tables, since the rotating tube locking force is concentrated at a short wedge which requires a fairly large overall radius for the circular locking mechanism to achieve its necessary strength, resulting in a relatively bulky mechanism, shrouded by a bulky frame. The long term strength of such a design is questionable, due to its complete reliance on the table top for support of the legs and locking mechanism, with the frame giving no direct support to the legs and locking mechanism. The given solution is not an optimal design for the best universal table utility, in which a leg is near each corner of a rectangular table.
The current state of the art of folding tables is fundamentally limited by the tradeoff achieved between strength and rigidity, and the aesthetic execution of the locking mechanism. Today's most popular folding tables generally continue a half century practice of using interfering, unaesthetic, visible angled braces for the legs. In addition, legs are paired in such a way that it is impossible to sit between such legs at the table end. Due to the impossibility of sitting at the table end, between the legs of the shorter models of the most popular type of folding table, which continues to dominate the state of the art, the only proposed solution to enable end seating at these types of tables is to increase leg room distance between the end of the table and the legs, which generally requires making the table longer. In attempts to attain these features, excessively expensive or flimsy tables have been developed. This limits the utility of tables based on the state of the art.
SUMMARYAn objective of the present invention is to overcome the limitations mentioned above in a compact, light, simple and economical, strong, rigid, safe, and mechanically and aesthetically optimal folding table, whose execution in metal (the top may be other than metal) is practically indistinguishable from the clean lines of a nonfolding welded frame metal table. A further objective of this invention is to present a solution for automatically locking and unlocking of the hinged legs in their erect position. In other words, the operator simply and obviously, by grasping and pulling or pushing a leg, extends, or folds the legs, without any separate thought or action to actually lock or unlock the legs, which automatically “snap” into or out of their “locked” erect position by applying force on a table leg. Another object is to ensure table leg rigidity and security in the working, erect position by the overall design.
This invention is applicable to a broad variety of embodiments, depending on the choice of materials, the chosen technologies, the aesthetic and functional executions, various levels of quality and price. Two obviously differing embodiments are the one of 100% plastic, and the sheet steel frame and structure with particleboard top version, reflecting the most popular common construction. The following overview for a preferred embodiment of this invention approximates the most popular prior art folding table attributes. Such a preferred embodiment consists of a particleboard (plastic, wooden, combination, or similar) table top supported by an open “U” profile sheet steel frame and a pair of rotational leg assemblies, which can include a single leg or pair of legs, achieved through a construction in which a leg (one or more) is rigidly joined to a hinged, lockable horizontal cross member (typically tubular), of preferably square cross section, such that by rotating a leg, two rigidly joined legs at a time are automatically locked into or out of the erect position. Such a tubular cross member is rotationally attached to the table at a pivot. The preferred embodiment of this pivot is a continuous (“piano”) hinge attached to an intermediate steel plate which rigidly unites into a self-supporting unit the entire hinged leg assembly and table frame combination, independent of (without) the table top. By appropriate bonding and fastening to the frame and intermediate plate, the table top can enhance the strength and rigidity of both the frame and intermediate plate. The intermediate plate's resistance to deformation, through numerous means of stiffening and strengthening well known to the art, is the foundation of the strength and rigidity of the legs in their erect working position.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention is more particularly described in the following exemplary embodiments that are intended as illustrative only since numerous modifications and variations therein will be apparent to those skilled in the art. The preferred embodiments are now described with reference to the figures, in which like reference characters indicate like parts throughout the several views.
In
The preferred embodiment in
The intermediate plate 8 is for the support, through rigid connection with the frame and firm bonding with the table top, of the high leverage stresses exerted by the tubular cross member and legs combination 3 and 5 in conjunction with the hinge 7, and to a small extent the locking forces on the locking spring 9 through combined bracket 10 and frame 2. Therefore the intermediate plate 8 can be welded or brazed along its continuous contact with all three sides of the frame 2, and the frame in this area, although an open “U” profile, or channel, should be closed to form a rigid tube by channel 10, as drawn, adjacent to the rotational legs and cross member unit, and for highest heavy duty rigidity, closed around the curves unto the end of the intermediate plate (not shown in the drawings, which reflect a medium quality version). As seen by comparing
A preferred inexpensive enhancement to the basic design discussed thus far, including the three-legged round version of this table, is the second leg stop bracket 15 illustrated in
The leg stopping surfaces of the intermediate plate 8 and the optional leg stopping bracket 15 can be protected from corrosion with either suitable metal plating, or special thin plastic films, with possible adhesive backing, instead of paint which can crack or chip under the high stress of high-leverage contact. The corresponding contact surfaces of the rotating horizontal cross member can likewise be protected from possible corrosion.
A higher quality, heavy duty table can also feature brazing or welding some of the links in the continuous hinge located nearest to the legs both to the intermediate plate, as well as to the hinge plate itself, to prevent the rolled hinge from unrolling under stress which may be somewhat more concentrated at the legs 2, due to the imperfect rigidity of the cross member 5. On the contrary, for a cheap table, the floor plate could be of more deformable steel, unconnected to the frame, or entirely eliminated (preferably compensated through the use of a hinge with a wider leaf for greater adhesive bonding surface to the underside of the table), and the construction less robust, with a lowering of quality. For plastic top tables, including blow molded tables, the top of the intermediate plate 8 would likely need to be reinforced to be made highly rigid, which can be done as simply as bonding a strong wooden board to this area. Or the complete metal table structural unit, reinforced by a rigid stiffening panel on top of intermediate plate 8, could be molded directly into a suitably reinforced plastic table top matrix in a single molding operation.
At each tubular cross member 5 is a one-piece locking mechanism, a simple spring approximately as illustrated (e.g.
The preferred sheet steel support, i.e. frame element 10 for the locking spring 9, performs several functions: it closes the “U” channel frame next to the leg bearing cross member to form a rigid tube, adding necessary strength and rigidity for the intermediate plate 8 to support the high locking stresses due to leg leverage; it provides an appropriate mounting surface for attaching the locking spring 9; it provides a backing surface to limit the rearward yielding motion of the locking spring 9 in the direction of the frame during locking, thereby forcing the locking spring 9 to engage and lock the cross member 5 at the optimum angular position in the turn of the legs for locking (see
The result of such a spring movement limiter, or stop, is assured, “positive” locking action. Also, unlocking is advantageously “delayed” in terms of rotational angle, since there is no stop for the spring 9 in the opposite, forward, or unlocking direction (See
By virtue of extending the locking spring 9 up to nearly the entire length of the rotating cross member 5 which it engages, the use of an inexpensive light and flexible spring becomes possible due to the unusually high pressure attainable from an unusually wide spring. Thus, a key inventive step is the realization that adequate locking force, without the use of the customary unsightly and interfering diagonal leg braces, is achievable by exploiting the long locking geometry available along the normally extensive length of the cross member (typically the narrow, or “end”, width in the case of a rectangular table) by application along the edge diagonally opposite from the hinged corner of this cross member the cumulative pressure of an uncommonly wide spring. The spring needs to be quite yielding (elastic) in order to effectively and durably engage and disengage the cross member (see
The required flexibility normally, or intuitively, suggests weak locking force, and therefore unsuitability of such a spring for securely holding a table erect in normal use, working against anticipated great leg leverage at the cross member. The wide structural span (from leg to leg in case of a leg at either end) of the cross member is available for application along this width of an unusually long spring whose cumulative pressure by virtue of this width would attain the required locking force.
A corrolary insight was the recognition that to attain secure table stability the locking force applied by the spring 9 need not be great, because the table as a whole is always held rigidly erect by at least one of the two rigidly joined sets of legs. In a traditional completely rigid table, both pairs of legs do this. In this invention, one rotating set of legs is nearly always forced against its rigid mechanical stop, or at right angles to it, which meets with inherently rigid resistance, for any direction of force on the table, resulting in adequate overall table rigidity, in spite of the fact that at the opposite set of legs the locking spring may theoretically yield at a relatively low force applied at the foot of the table leg.
Balancing spring properties against spring length can attain any practical total distributed spring locking force. The greater the spring length, the gentler, more flexible, more durable, and less exotic or expensive can be the spring material. Consequently, the choice of spring materials advantageously grows with the spring length, such as economy, and ability to weld, braze, form, etc. Thus the large available span of the rotating cross member 5 enables a wide choice of materials, not excluding plastic, for an all-plastic table, including a suitable version of the locking spring 9.
The obvious concern regarding the limited, possibly even weak locking force of any such locking spring is answered by the fact that the present invention embodies a robust physical limit to the leg rotation in the direction of extension. Because the opposite pairs of legs 4 open in opposite directions, for any force applied to the table, one set of legs will always be forced against its rigid stop, and hence hold the table rigidly immobile, within the constraints of floor friction, while the locking spring 9 of the opposite pair of legs, which is potentially subject to compression by such a force if the opposite pair of legs slip on the floor, can be designed to be as rigid as necessary, using material or dimensional properties, such as added spring thickness or width, multiple spring layers, or support structures as needed. In other words, great total locking force of the locking spring 9 is consequently not necessary and locking force which is comfortably modest for snapping the rotational leg assembly (or unit) into lock and snapping out of lock, is very acceptable.
A practical tradeoff, or optimized balance between the property of ease of locking and unlocking of the legs, and resistance to leg collapse under applied table force is determined experimentally by dragging the table under various loads across floors of various frictional resistance. Lubrication of the sliding locking spring 9 contact with the cross member 5 may be addressed by plating the cross member 5 with a soft metal such as copper, to form a bearing interface with the hard metal of the spring. Many lubrication techniques are known, and the open and accessible structure of the lock facilitates easy conventional lubrication and cleaning.
The preferred implementation of this invention favors popular folding table sheet steel channel (sheetmetal bent in a “U” shape) for the frame, as well as popular fiberboard or unreinforced plastic table material, or the reinforced blow molded plastic table tops coming into popularity. Fiberboard and especially unreinforced plastic tables need supporting frames, since such a table lacking a supporting frame can sooner or later distort or fail. Folded or erect, the simple and simple to use, compact, lightweight, yet robust locking mechanism pertaining to this invention is concealed within the perimeter and shallow depth of the table frame, and when erect, the table is scarcely distinguishable from the optimal lines and configuration of a welded tubular steel frame table, whereby the aesthetic objective of this invention is achieved. In addition, safety is provided for the user, in that the table can be designed so that nothing extends below the table frame to interfere or snag, except the legs in their extended position. A table incorporating the benefits of this invention permits optimal freedom of seating at the ends of even the shortest table because the table legs are at the corners of the table.
Many variations of this invention may be effected, without departing from the scope of the invention. Folding table of the invention can have table top of arbitrary size, shape, structure and composition (see for example
In a much lighter all-plastic version, there may be no apparent frame, and probably bulkier parts, with much internal reinforcement, probably with fibers, and structural parts of the metal version could be only functionally adapted into the plastic embodiment. In other words, the plastic functional equivalent embodiment of this invention may use parts which are very different in appearance from the metal version, may not embody all of those parts, and may have parts or structure which is not at all present in the description of the popular metal frame and legs version described in the preferred embodiment above. Similar comments apply to other materials, and combinations of materials. Even the spring may be plastic.
But having a different design for a plastic spring latch—a flat vertical plastic sheet mounted in a similar position with respect to the square cross member as in the metal version, but having relatively small movement, and having a rigid engaging “catch” on the end, as an angled “tooth”, or “shoulder” to engage by spring pressure the corner of the cross member at a wedging angle, so as to yield, break its grip and slide back under unlocking tension. This approach would also work in metal, but less effectively than the presented version, as a simple flat spring with a less than 90 degree bend at the end, either flat or possibly curved round to engage by wedging action the corner of the cross member (
A variety of latch designs is readily conceivable. Instead of the spring the means of holding the cross member in its erect position with firm force against its stop can be a snap-open/snap-locked resilient fastener, which can be magnetic, adhesive, vacuum (e.g. suction cup), spring (e.g. clip), rubber (e.g. clip), mechanical (clip), or similar, enabling automatic engaging of the legs in their erect position, and automatic disengaging of the legs from their fixed erect position.
An all wooden table is possible under this concept, with the obvious exception of the spring, its engaging surface on the wooden cross member, hinges, and similar hardware typically of metal in wooden tables. The invention makes no suggestion of dimensions or relative proportions, as does the ideal embodiment. The spring can thus be long or short, in the horizontal direction parallel to the axis of the horizontal crossmember, and can be of any shape and relationship to the surrounding structures, segmented or continuous, connected in any manner to the table or frame at any suitable location, so long as it accomplishes the same function: automatically (without operator intervention, other than turning the legs as described) engaging and disengaging the table leg cross member with enough force to hold the cross member securely in the erect position. A short table would necessarily have the legs offset in one way or another (legs folded on top of each other (thus having half the thickness shown) or side by side, etc.)
It is also conceivable to attach the spring to the rotating cross member, which could be, for example, an angle (“L” profile) or channel (“U” profile) iron instead of a rectangular tube such that the spring is located within the sides of the L or U, which would then engage a suitable structure fastened to, or part of, the table surface or frame (An example of such a structure is an inverted “L” angle iron along the frame adjacent to the rotating cross member, whose edge engages the locking spring in the cross bar, etc.).
In other words, whereas in the preferred embodiment, the spring was fixed to the table (frame), and the rotating cross member which the spring is to engage was moving, these roles can be easily reversed, by attaching the locking spring to the cross member, to engage a structure analogous in function if not in form to the moving cross member structure in the preferred embodiment described above, without departing from the scope of this invention. The preferred means of holding the legs in the folded position may be replaced by any other means, and likewise, the leg deformation support.
These are nonessential to the invention, and may in fact, be entirely absent, and still meet the scope of this invention. In addition, the described embodiment is a table, however, the concept of the invention would be equally applicable to a chair, a bench or any other structure that could be folded for storage or the like.
Further, the invention has been described in connection with three or four legs. However, the invention would work equal well with two legs. A two legged embodiment would have broad feet to stabilize the legs. Even a one legged embodiment is within the scope of the invention.
In the embodiments described above, by manually applying pressure to a respective leg to cause the fastener to break its grip, the table legs can be moved from the erect position to the folded position. In another embodiment, a disengagement device can be employed. In a preferred embodiment the disengagement device is a spring latch disengagement device.
The view of
A cam bearing block 36 is rigidly attached to spring disengagement plate 37. The spring disengagement plate 37, slides in a substantially 90° arc (see
Note that the spring disengagement plate 37 slides on the surface of crossmember 5 (such that the motion of all points on its surface describe a short substantially 90° arc, the locus of which is depicted in
If an ideal perfect balance such as just described could be maintained and guaranteed, blocks 50 and 51 (
A return to rest stopping block 38 to stop the travel of the control handle in its resting position: This stopping block 38 is rigidly attached to the spring release plate 37 at its rear edge. Block 38 is preferably a block of metal brazed, welded, or similarly attached to plate 37.
A main feature of this embodiment is the elements for the control and restriction of the motion of locking spring disengagement plate 37. This motion is described by the two short arcs, drawn with arrows at the ends, describing substantially 90°. Three identical stopping, or motion limiting bars are shown: 50, 51, and 52. Bar 51 is rigidly attached to spring disengagement plate 37; and bars 50 and 52 are rigidly attached to the leg-bearing horizontal crossmember 5, such that bar 51 slides between bars 50 and 52, the latter two bars limiting the motion of bar 51.
Thus, bar 50 insures that when plate 37 is in its maximum disengagement extension, both bars 50 at each end are in contact with both bars 51, insuring that the locking spring 9 is forced back uniformly and precisely to its optimal disengagement position. This position is sensed by the operator, in that he feels the resistance of the blocking, as well as sees the 90° position of the handle; at which point the operator knows that the locking spring is disengaged, and he may begin to rotate the table legs to fold them.
Bar 52 at both ends of the spring disengagement plate 37 stops the spring 34 driven motion of the entire mechanism at its resting position, where the control handle 31 is parallel to the horizontal crossmember 5, and the spring disengagement plate 37 is resting in its fully retracted position.
Retaining and guide plate 53, in conjunction with its mounting and precision spacing block 54, insure that the ends of the spring disengagement plate 37 cannot be forced out of their normal positions. This is not necessary to the operation of this invention, but is a useful precaution against accident or vandalism.
As set forth above,
A primary difference between the two embodiments (of
Similar to the embodiment of
A return to rest stopping block 38 is used to stop the travel of the control handle 31 in its resting position. This stopping block 38 is rigidly attached to the spring release plate 37 at its rear edge. The stopping block 38 is preferably an angle bracket that can be brazed or welded (or attached in any suitable manner) to plate 37, at its rear edge. However, note that this bracket is preferably located as near as practical to the center of plate 37. In this central position, the spring driven handle 31 acting on the bracket 38 forces plate 37 backwards to its normal rest position.
In view of the foregoing, the invention resides in the novel selection, arrangement and combination of parts performing clear functional roles of novel choice and combination, as described and claimed, producing a new and advantageous result; it being understood that changes in the precise embodiment of the invention herein disclosed may be made within the scope of what is claimed without departing from the spirit of the invention.
Claims
1. A folding table, comprising:
- a table top;
- at least one leg, each leg being rigidly connected to a respective cross member to form a respective rigid leg assembly;
- a pivot assembly pivotally connecting each respective leg assembly to an underside of said table, said pivot assembly substantially spanning a length of a respective cross member; and
- a means for holding each leg assembly in a first position,
- wherein an axis of each said pivot assembly is eccentric to a respective cross member, allowing the cross member a limited range of rotation from said first position when one of said legs is erect, to said second position, when said one of said legs is folded against the underside of the table, when said cross member is in said first position, a surface of a respective rigid leg assembly contacts a surface of the underside of the table.
2. The folding table according to claim 1, wherein the means for holding the leg assembly comprises an automatically engaging and automatically disengaging fastener structured and arranged to join the cross member to the table structure and preventing rotation of the cross member with a grip sufficient for maintaining reasonable resistance to table collapse, and permitting ready breaking of this grip by a user applying manual lever force to an end of the leg in order to fold the leg assembly.
3. The folding table according to claim 2, wherein the means for holding the leg assembly is selected from the group consisting of limited grip fasteners that are magnetic, adhesive, vacuum, mechanical, or rubber, enabling automatic engaging of the legs in the first position and automatic disengaging of the legs from the first position by applying manual pressure to a leg assembly.
4. The folding table according to claim 2, wherein the means for holding the leg assembly is a locking spring having a cross sectional contour enabling automatic engaging of the legs in the first position and automatic disengaging of the legs from the first position through manual rotational pressure applied at a leg.
5. The folding table according to claim 4, wherein the cross member is approximately square in cross section, and said pivot assembly is a continuous hinge mounted at a longitudinal corner of the rotational leg assembly adjacent to the table surface.
6. The folding table according to claim 5, further comprising:
- a channel profile frame supporting the table top,
- a base plate rigidly attached to and supported by said channel profile frame, and
- a channel profile structural member rigidly combined with the channel profile frame which together form a closed profile rigid tube situated adjacent and parallel to a respective leg assembly affording a mounting surface and rigid support for the locking spring, one of said leg assemblies being mounted within a perimeter of the frame and adjacent to said frame through said pivot assembly to a surface of said base plate.
7. The folding table according to claim 4, wherein the locking spring is metallic, plastic or elastic material.
8. The folding table according to claim 1, wherein the means of holding the leg assembly in the first position are fixed to the table.
9. The folding table according to claim 1, wherein the means of holding the leg assembly in the first position are fixed to the cross member.
10. The folding table according to claim 3, wherein the axis of the pivot assembly is at a corner of the cross member allowing the cross member to turn from the first position to the second position, so that when said legs are in said first position, the legs end their freedom of travel by the cross member contacting a rigid stopping surface which is part of the underside of the table.
11. The folding table according to claim 1, wherein said at least one leg is connected to a respective cross member to form one of a U-shaped, L-shaped, I-shaped and Y-shaped leg assembly.
12. The folding table according to claim 1, wherein there are at least three rotational leg assemblies and the table top has a non-rectangular shape.
13. The folding table as claimed in claim 1, wherein there is at least two of said leg assemblies that are substantially opposite to each other so that said leg assemblies open in substantially opposing directions.
14. The folding table as claimed in claim 1, further comprising a means for disengaging said means for holding each leg assembly in said first position.
15. A folding table, comprising:
- a table top;
- at least one leg pivotally connected to said table top, said at least one leg being pivotable from a first position substantially parallel to said table top, to a second position substantially perpendicular to said table top;
- at least one cross member extending substantially parallel to said table top, said at least one leg being rigidly connected to a respective cross member, said respective cross member pivoting when said at least one leg pivots;
- at least one pivot assembly rigidly connected at a respective first end to said table top and rigidly connected at a respective second end to a respective cross member; and
- at least one fastener engaging a respective cross member when a respective leg is in said second position and being spaced apart from said respective cross member when said respective leg is in said first position.
16. The folding table as claimed in claim 15, wherein said at least one leg, said at least one cross members and said at least one fastener number three and said table top is substantially round.
17. A folding table according to claim 15, wherein the fastener is a locking spring having a cross sectional contour that automatically engages a respective cross member when a respective leg is in said second position, and automatically disengages said respective cross member when said respective leg is in said first position, when a user manually applies rotational pressure to said respective leg.
18. The folding table according to claim 15, wherein said at least one cross member is substantially square in cross section and said at least one pivot assembly is a continuous hinge.
19. The folding table according to claim 15, further comprising:
- a channel profile frame supporting the table top, said at least one leg and at least one cross members being mounted within a perimeter of the frame and adjacent thereto, and
- a channel profile structural member rigidly connected to the channel profile frame to form a closed profile rigid enclosure situated adjacent and parallel to the cross member, said fastener being connected to said channel profile structure.
20. The folding table according to claim 15, wherein a pair of legs are fixed to a respective cross member, forming a U-shape rigid pair of two legs and the cross member.
21. The folding table as claimed in claim 15, wherein there are at least two legs that are substantially opposite to each other so that each of said at least two legs open in a substantially opposing direction.
22. The folding table as claimed in claim 15, wherein said fastener extends over a majority of said respective cross member.
23. The folding table as claimed in claim 15, further comprising a fastener disengaging mechanism that is movable from a first fastener disengaging position spaced apart from said fastener to a second fastener disengaging position in contact with said fastener, so that in said second fastener disengaging position, said fastener disengages said respective crossmember.
24. The folding table according to claim 23, wherein the fastener is a locking spring having a cross sectional contour that automatically engages a respective cross member when a respective leg is in said second position, and said fastener disengaging mechanism includes a spring driven handle that is pivotable to cause the mechanism to contact and disengage said locking spring from said respective cross member so that said respective leg is movable to said first position, when a user manually applies rotational pressure to said respective leg.
25. The folding table according to claim 24, wherein the handle is pivotal about a shaft and comprises a release plate that slidingly engages the crossmember when the handle is pivoted.
26. The folding table according to claim 25, wherein the shaft pivots within an elongate hole and an arc of motion between said first fastener disengaging position and said second fastener disengaging position is substantially 90°.
27. A foldable support structure, comprising:
- a substantially planar top;
- a plurality of legs pivotally connected to said top, said plural legs being pivotable from a first position substantially parallel to said top, to a second position substantially perpendicular to said top;
- a plurality of pivotable cross members extending substantially parallel to said top, at least one of said plural legs being rigidly connected to a respective cross member, so that said respective cross member pivots when said at least one plural leg pivots;
- a plurality of pivot assemblies connected at a respective first end to said top and connected at a respective second end to a respective one of said plural cross members and spanning a length of a respective one of said plural cross members; and
- a plurality of fastening members connected to said top and releasably engaging a respective one of said plural cross members when said plural legs are in said second position and being spaced apart from said respective one of said plural cross members when said plural legs are in said first position.
28. The foldable support structure as recited in claim 27, wherein said fastening members are selected from the group consisting of snap-open/snap-shut resilient fasteners, magnets, releasable adhesives, suction members, elastic or mechanical clips and locking springs.
29. The foldable support structure as recited in claim 27, wherein said plural pivot assemblies span substantially an entire length of said respective one of said plural cross members.
30. The foldable support structure as claimed in claim 27, further comprising a plurality of disengaging members connected to a respective one of said plural cross members that disengage a respective one of said plural fastening members from said respective one of said plural cross members.
31. The foldable support structure as claimed in claim 30, wherein each of the plural disengaging members comprises a handle pivotal from a first handle position to a second handle position, said handle disengaging a respective one of said plural fastening members in said second handle position, and a handle stopping block to stop said handle from pivoting beyond said second handle position.
Type: Application
Filed: May 28, 2004
Publication Date: Dec 1, 2005
Inventor: Vilis Lietuvietis (Harjumaa)
Application Number: 10/855,636