CA1123884A - Folding furniture piece - Google Patents

Abstract

ABSTRACT OF THE INVENTION
A folding columnar support structure for use as a stool, snack table or other collapsible furniture device is made up of foldable articulated elements positioning a support surface or top relative to a flat base in a locked open position with the top spaced from the base or in a closed position with the support structure and base folded flatly against the top.

Description

~3~3~4 BACKGROUND OF THE INVENTION
Foldinc~ tables, seats and other collapsible furniture pieces are very popular in toda~ls society. Apartment living has created a demand for space saving devices, and increased leisure time activi-ties like picnics and sports, have increased the need for ~ightweight, s-to~able furniture. Conventional folding furniture of all sizes and types are available which utilize various collapsible and folding support structures. How-ever, high cost, clumsy appearance, awkwardness of operation, instability, and many other deficiencies render known existing devides less than satis~actory.
Typically con~entional folding tables have four legspivotally mounted at their upper ends to the underside of four corners of a square table top. Each leg pivots to a position within a recess in the table top when the table is in the stor-age or collapsed position. To erect the table top to its open or operable position, each leg is separately manuall~ pivoted to a position at right angles to the top. Slide bar or spring operated locking devices maintain the legs in upright position.
The underside of the folded table does not present a smooth appearance and the recessed legs remain exposed as a hazard to catch objects. The opening procedure is clumsy and time con-suming, with the possibility of pinching the user's fingers in the mechanism.
Similarly, conventional folding chairs, like folding bridge chairs, do not present a smooth appearance when in the collapsed position, and lie less than flat. Stacking of co-lapsed chairs is inhibited and slow because of the bulging contoun of the folded structure. The legs of the folded chair ~a ~123~

prot~ude and present ha~ards and a cluttered appeaxance.
Conventional TV-snack and tray-tables t~pically com-prise t~o interlocking inverted "U"-shaped leg elements hinged together at their ~iddles to support a tray-like -top snapped into position on the horizontal crosspieces of the spread skeletal framework. To collapse the device, the tray top is unsnapped, the leg pieces are folded against each other, and the tray is re-snapped to hang loosely down from one of tne crossbars along the collapsed leg structure. Even when a stacking rack is used, the legs protrude as appendages and present a hazard and a cluttered appearance in the sborage position. The assembly~disassembly procedure is cumbersome, and typical tray-table arrangement is unst~ble when open.
Because the tray top itself serves as the means to lock the table in open position there is rîsk that the structure will collapse when a load is applied should the tray not be securely snapped to the crosspieces.

SUMMARY AND OBJECTS OF THE INVENTION
The invention overcomes the àbove-mentioned deficien-cies of conventional devices by providing a simple, lightweight,collapsible supporting structure that is easily operable and also presents a pleasing appearance both in the open and collapsed state.
An important object of the invention is the provision of an improved rigid, lightweight, portable table, snack tray, stool or the like, which is collapsible for compact storage.
Another object of the invention is to provide a support device employing a collapsi~le column made up of articulated sùpport elements which abut and brace against one another to provide better resistance to downward lorces.

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~ related objec-t oE -the invention is to pxovide a collapsible support device which is easily assembled and disassembled~
Another object of the invention is -to provide a fold-ing support device which has a pleasant aesthetic appearance in both the open and collapsed positions.
A further object of the invention is to provide a lightweight collapsible support device which can be inexpen-sively manufactured.
A still further object of the invention involves the production of a folding support device having a minimum number of different parts, especially in its simplest form the provision of only three different parts: a top; a base;
and an articulated support element, a plurality of which can be used cooperatively to make up a collapsible columnar support to interconnect the top and the base.
A still further related object of the invention is the manufacture of a folding table or stool in which all components can be assembled into the finished product by merely snapping the parts into place.
Another object of the invention is the provision of a folding support device with improved locking means to lock the device into an open, or extended, and a closed, or collapsed, position.
The ~oregoing and other objectives and advantages of the invention are achieved by a device which comprises a fold-ing support device utilizing a collapsible column support means to maintain the positional relationship of a weight receiving support surface, such as a table or stool top, to a flat base 30 member. The collapsible column comprises a plurality of interengagable articulated support elements extending 31~Z38~3~

between -the base and top. The elements are movable in con-cert -to fold about hln~es or pivots intermecliate their ends to position -the device in either a collapsed position wherein the elements and base are folded against the top, or in an open position wherein -the top is rigidly supported above the base by the assembled column. Locking means is provided to maintain the assembled column in rigid open position in order that the weight receiving support surface can carry its load.
In one illustrative embodiment of the invention, the top is provided with a peripheral downwardly-projecting flange to form a recess into which the folded articulated elements of the column and the base member can be received when the device is placed in the collapsed state. This gives a neat closed appearance and makes for convenient transportation~
storage and stacking. In a preferred application of this invention! means are provided to lock the structure in its collapsed positipn; thereby keeping the device in a compact storage position and eliminating the nuisance of partially protruding appendages.

Significant advantages of the invention arise out of the preferred use of articulated elements comprisin~ flat panel pieces hinged end-to-end in pivotal relationship. One free end of each of said elements is preferably pivotally connected to the top at locations equidistant from the center point of the top, and the other free end of each of said elements is connected to the base at locations equidistant from the center point of the ~ase member. Advantageous results are obtainable if the panels are identically shaped and hinged at the midpoints of the articulated elements, with the hinged ends of the panel being shorter than the ends which are connected to the top and base. This arrangement 3~

permits the articulated elements -to Eold over -themselves about their mid-points, presenting an assembled column which may be vie~ed as two truncatea pyramidal sections joined together at their apexes with panels of adjacent ar-ticulated support elements bracing against one another. mhe cen-tral indentation Q~ the column provides signi~icant stability to the assembled support device. Exertion of a downward force by the supported load drives adjacent column panel members against each other to provide upward resistance.

The preferred use of a central support column with its axis coinciding with an axis drawn from the center of the top to the center of the base provides increased stabili-ty over conventional devices, especially for embodiments of the inven-tion employing a wide base member. A large flat base structure discourages tipping which is a common fault of typically available tray tables.
A preferred means for locking the support device in the open position utilizes lateral edge ribs on the articulated panel pieces with interlocking interengaging ribs of adjacent panel pieces at the mid-point of the column. This interlock-ing feature .LS preferably a stepped angled portion on resilient rib ends so that adjacent rib ends can be snapped into over-lapping relationship. The ribs are preferably staggered between upper panels and lower panels so that the angled lower end of an upper panel rib overlaps and interengages with the mating angled upper end of an adjacent lower panel rib. Com-bining the centrally indented column arrangement with the interlocking rib arrangement provides for mutual bracing of the panels of the column and locking of the column when it is in the assembled load bearing position. The panels preferably are also provided with holes or handles to permit manual 3~

gripping for rapid disassembly.
~n advantage over conventional devices is obtained through use of a means for locking the support device in the closed or collapsed position. This locking means can be conveniently furnished by an intermating flange arrangemen-t disposed with a male member on one panel of one articulated support member and a female member on a similar portion of the other panel of the articulated support member, positioned for interengagement when the support member is folded into collapsed position.
In summary, according to one broad aspect of the present invention, there is provided a folding table, stool or like support device comprising a top, a base and collapsible column means interconnecting the top and the base, the column means comprising more than two articulated support elements each comprising a first member having two spaced side edges and being pivotally connected at an upper end to the top and a second member having two spaced side edges and being pivotally connected at a lower end to the base, the first and second members being hingedly interconnected for pivoting outwardly with respect to a central axis extending through the top and the base to a collapsed position with the top adjacent the base and for pivoting inwardly with respect to the central axis to an over-centre upright positiQn in which the side edges of each articulated support element are in engagement over a major part, including at the hinge portion, of the length of the articulated support element with the side edges of the adjacent articulated support elements thereby to provide mutual support to maintain them in the upright position.
According to another broad aspect of the invention, there is provided a folding table, stool or like support device comprising a top, a base and collapsible column means . - -3L~23~84 interconnecting the top and the base, the column means compris-ing more than two articulated support elements each comprising a first member having two spaced side edges and being pivotally connected at an upper end to the top and a second member having two spaced side edges and being pivotally connected at a lower end to the base, the first and second members being hingedly interconnected for pivoting outwardly with respect to a central axis extending through the top and the base to a collapsed position with the top adjacent the base and for pivoting inwardly with respect to the central axis to an over-centre upright position in which the side edges of each articulated support element are in engagement at least at the hinge portion with the side edge of the adjacent articulated support elements thereby to provide mutual support to maintain them in the upright position and in which the first and second members are formed as an integral plastics element having a web formed at their junction and serving as the hinged inter-connection.
The invention will now be described in greater detail with reference to the accompanying drawings in which:
Figure 1 is a perspective view of a collapsible furni-ture device incorporating features of the present invention;
Figure 2 is a side elevational view of the folding device of Figure 1, in partial cutaway, showing the device with the collapsible column structure in open assembled position, and in broken lines in a position intermediate the open and collapsed state;
Figure 3 is a sectional view, taken along line 3-3 of Figure 2;
Figure 4 is a sectional view, taken along line 4-4 of Figure 2;

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~123B84 Fiyure 5 is a fragmentary sectional view on an enlarged scale, taken along line 5-5 oE Figure 3;

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Figure 6 is a fragmentary sectional view, taken along line 6-6 of Figure 2;
Figure 7 is an enlarged view illustrating de-tails oE
means for locking the hinge in the extended position in the structure of Figure 2;
Figure 8 is an enlarged view illustrating the lock-ing means of E`igures 2 and 7 when the parts are in the broken line position of Figure 2;
Figure 9 is an enlarged plan view of the device in an inverted position, showing the furniture device of Figure 1 in the collapsed conaition, in partial cutaway;
Figure 10 is a sectional view taken along the line 10-10 of Figure 9;
Figure 11 is a perspective view of a second embodi-ment of the present invention incorporating certain additional features;
Figure 12 is an inverted plan view of the furniture device illustrated in Figure 11, showing the same in its collapsed position.

Figure 13 is an elevational view illustrating one articulated support member of the device of Figure 11; and Figure 14 is an inverted perspective view of the top of the device shown in Figure 11 separated from the remaining structure.

DESCRIPTION OF A FIRST PREFERRED EMBODIMENT
For purposes of illustration, the invention in its preferred form is embodied in a folding snack table, though the same advantages and features are readily adaptable for use in a collapsible stool or other portable support device.

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Referring first to Figure lt the inVentiQn prefera-bl~ utilizes parts made of molded plastic material. In general, these parts comprise a collapsible column 10, and base 16 on which the column is mounted and an elevated sup-port surface such as a table top 14 which is in turn supported by the column. A locking means maintains the table in an open, load-supporting position. In the preferred embodiments, the column 10 is collapsible so that the base 16 and folded column structure 10 nest within a recess in the top 14.

The collapsible column supporting structure 10 is comprised of a plurality of articulated support elemen-ts 12 which are pivotally fastened to the top 14 and base 16, respectively, by means of pivotal mounting means 28.
As shown best in Figure 2, the articulated support elements 12 are preferably in the form of a pair of identical trapezoidally shaped panels 20a and 20b. Each panel has parallel end edges 24 and 26 and nonparallel side edges 27 which are preferably of equal length. The edges 24 abut one another and are hinged together along a line 22. The ends 24 are preEerably shorter than the ends 26 which are pivotally mounted on the top 14 and base 16. This construc-tian per~its folding of the panels 20a and 20b about their respective midpoints 22 so that they can assume the position shown in full lines with their side edge surfaces in contact with the surfaces of adjoining support elements to provide bracing against a downward load exerted when a weight is applied to top 14.
As can be seen from Figures 1, 3 and 4, in the illus-trated embodiment, three articulated elements 12 each comprised of panels 20a and 20b, make up the collapsible columnar _9_ ~l~Z3~

structure 10. The ends 26a and 26b of the panels arepivotally secured to the top 1~ and base 16, respectively, at points which are generally equidistant from the cen-ter of -the top and base respectively.
In the illustrated embodiment shown in -the figures as indicated above, the panels 20a and 20b have a generally trapezoidal shape. Figure 6 shows a detail of the hinged joint between panels. Although other means of hinging the panels may be employed, it is preferred that the panels are secured together by a thin flexible web of material 22a which may be formed integra~ly with the panels during the molding process.
The pivotal mounting means 28 is best shown in Figure 5. Rod-like portions 36 molded on the ends 26 of panels 20 are snap-fittable within resilient flanges 38 molded onto the top and base. The flanges fit around the rod-like portions 36 to form sockets as shown at 37 permitting the panels to freely pivot.
The way in which the parts move from the extended or open position to the collapsed position can be visualized ~rom inspection of Figure 2, wherein the column is shown par-tially collapsed in broken lines. In ~oing from the open position shown in full lines in Figure 2 to the closed posi-tion, the articulated support elements 12 pivot outwardly about hinges 22a, progressively collapsing panels 20a and 20b into adjoining face-to-face relationship, one panel folding flat against the other. In this position~ as shown in Figures 9 and 10, the base 16, the elements forming the column and the top all fit together to form a very compact structure.
30 To extend the device to the full upright, open position shown in solid lines in Figure 2, the top and base are separated ~3~3~

whereby planar members 20a and 20b swing apart fr~m each other about hin~es 22a. The angle between panels 20a and 20b is gradually increased -through 180, to an obtuse angle position at which the side edges 27 oE -the panels of adjacent support elements 12 abu-t each other presenting an assembled column 10 ~tith indented middle.
To maintain the table in a rigid, upright position, locking means are provided in conjunction with means providing for mutual support of the panels of the support elements 12.
As can best be seen in Figure 4, one edge 27 of each panel is beyeled as shown at 45 in the drawing. The opposite edge of the panel is provided with a flange having a surface which is shaped to ma-te ~gainst the beveled surface 45 of an adjacent panel. In the drawings, the flanges of the uppermost panels are identified by the number 46a and the ribs of the lowermost panels being identified by the number 46b in Figures 2 through 4, 7 and 8. In addition, the flange on an upper panel of each articulated element is immediately above a beveled surface on the lower panel of the articulated element. As the panels swing into the upright position shown in full lines in Figure

2 the surfaces on -the flanges 46a and 46_ move into interfit-ting and bearin~ relationship with the beveled surfaces 45 on the immediately adjacent panels 45, thereby supporting the top and the load imposed on the structure.
To lock the column in the ùpright position, the column locking means, generally indicated at 44, preferably comprises steps 48 molded integrally with the ends of the lower and upper ends of flanges 46a and 46b respectively. As shown in Figure 3, one of these steps is mounted on the upper end of the flange of the lower panel of one articulated element and the other step is mounted on the lower end of the flange of the upper panel of -the next adjacent articulated element.
Sufficient "give" or resilience is provided in the structure so that as -the articula-ted elements are swun~ into the uprigh-t or column forming position the backs of -the steps ride up and over one another until the panels are in inter-fi-tting relationship at which point the steps are in mating and locking relationship in which the facing surfaces as shown at 48a and 48b are in contact with one another and prevent unintentional folding of the elements of the column to the collapsed position. To release the locking means, the panels of the articulated elements are moved in a direc-tion axially of the column by applying separating force to the top and the base at points adjacent the lockin~ means so as to effect separation of the steps. As soon as the steps are separated, the panels can be easily swung outwardly and the table parts moved to the collapsed position.
Upon reference to Fi.gures 3, 9 and 10 it can be seen that in the preferred embodiment the base 16 is dimen-sioned so as to be slightly smaller in plan view t.han the top 14. ~ shown particularly in Fi~ures 9 and 10, when in the collapsed position, the top is provided with a down turned flange or wall 50 so as to provide a relatively shallow recess 54 within which the base 16 and the articulated elements 12 fit when these elements are in the folded posi-tion. To this end, the length of the panels of the articulated elements must be short enough so that they do not extend beyond and strike the flange 50 when collapsed.
Preferably, locking means are provided for holding the base and the articulated panels in the collapsed position so that the device does not accidentally unfold when being carried a~out or otherwise not in use. To this end~ openings 52 are prefer~bly moldecl into the faces of the panels 20aand 20_. These openings are preferably surrounded by flanges 60 and 62. Around the edges of -the flanges, inter-Eitting detent ribs or projecti.ons best shown a-t 63 and 64 in Figure 10 are molded. The flanges are formed of a suffici-ently resilient material so that when the panels are collapsed the detent ribs snap over one another and lock the panels in the collapsed position. Unlocking is readily accomplished by grasping the base and the top and pulling them apart.
A rim 66 (Figure 1) may be added to the periphery of the upper support surface of top 14 in a snack table embodi-ment to serve as a means to prevent items, such as drinking glasses and dishes, from slipping off the top. Likewise, a stool may have a cushioned or contoured upper surface (not shown) in the top 14 to provide for a more comfortable seating platform.
Figures 11-14 illustrate a modified form of table incorporating the features of the invention. In Figure 11, the table is provided with a rotatable top 68 and planar panel members 20a and ~0_ are extended by -the addition of projecting support struts 70a and 70_. In Figure 11, a bearing channel 72 is disposed on a bearing positioning disc 74. The bearing channel 72 carries a plurality o~ bearings 76, of any suitable bearing material such as metal, glass or plastic. Top 68 (Figure 14) is modified for attachment to the disc 74 by means of a threaded boss 78 onto which a lock washer is placed for movable mountin~ with respect to said disc 74, and is well adapted to carry a load placed on it in "lazy susan" fashion. The addition of projection wing struts 70a and 70b increases the stability of the entire structure. Means for locking the` assambly in collapsed con-diti~n are preferably provided. This may comprise -the flanges 60 and 62 surrounding openings 52. ~lterna-tively, a bolt may be passed through a central opening in base 16 and threaded in-to boss 78. Base 16 and bearing positioning disc 74 may be identically formed so as to minimize the number of different parts to be molded, Figure 12 shows the struts 70 and planar members 20 with the panels 20a and b and struts 70 folded flat against the recess 54 within the rotatable top 68.
A modified hinge structure is shown in Figure 13 wherein hinge pins 22' are employed~
Furniture constructed in accordance with the inven-tion is preferably formed of impact-resistant moldable plastic materials, although other materials and forming techniques may be employed. By use of the invention, light-weight furniture having a variety of uses and which may be stored away in a relatively small amount of space when not in use, may be readily provided. Cost of production and assembly of components is quite low inasmuch as the parts may be formed using conventional injection molding or other commonly employed moIding techniques. Furniture incorporat-ing the invention has a pleasing, modern functional appear-ance, is easily cleaned and may be molded in a variety of colors or with attractive designs formed on its top, if desired. By way of example, furniture formed according to the invention may, by ~ay of example, have a wood grained or smoke gray or brown finish, or formed of a transparent material.

Claims (12)

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:

1. A folding table, stool or like support device compris-ing a top, a base and collapsible column means interconnecting the top and the base, the column means comprising more than two articulated support elements each comprising a first member having two spaced side edges and being pivotally connected at an upper end to the top and a second member having two spaced side edges and being pivotally connected at a lower end to the base, the first and second members being hingedly interconnected for pivoting outwardly with respect to a central axis extending through the top and the base to a collapsed position with the top adjacent the base and for pivoting inwardly with respect to the central axis to an over-centre upright position in which the side edges of each articulated support element are in engagement over a major part, including at the hinge portion, of the length of the articulated support element with the side edges of the adjacent articulated support elements thereby to provide mutual support to maintain them in the upright position.

2. A folding table, stool or like support device accord-ing to claim 1, wherein the side edges of each articulated support element are configured to engage substantially over their entire length with the side edges of the adjacent articulated support element when the articulated support elements are in the upright position.

3. A folding table, stool or like support device accord-ing to claim 1 or claim 2, wherein each member of each articul-ated support element has a bevelled side edge and a side edge provided with a flange configured to mate with the bevelled side edge of an adjacent member of an adjacent articulated support element.

4. A folding table, stool or like support device accord-ing to claim 1, wherein each member of each articulated support element has a bevelled side edge and a side edge provided with a flange configured to mate with the bevelled side edge of an adjacent member of an adjacent articulated support element, the flange on the first member being aligned with the flange on the second member of an adjacent articulated support element when the articulated support members are in the upright position.

5. A folding table, stool or like support device compris-ing a top, a base and collapsible column means interconnecting the top and the base, the column means comprising more than two articulated support elements each comprising a first member hav-ing two spaced side edges and being pivotally connected at an upper end to the top and a second member having two spaced side edges and being pivotally connected at a lower end to the base, the first and second members being hingedly interconnected for pivoting outwardly with respect to a central axis extending through the top and the base to a collapsed position with the top adjacent the base and for pivoting inwardly with respect to the central axis to an over-centre upright position in which the side edges of each articulated support element are in engagement at least at the hinge portion with side edges of the adjacent articulated support elements thereby to provide mutual support and in which each articulated support element is pro-vided with interlocking means, the interlocking means of each articulated support element being configured to engage the interlocking means of an adjacent articulated support element when the articulated support elements are in the upright position thereby to lock the articulated support elements in the upright position.

6. A folding table, stool or like support according to claim 5, wherein the interlocking means of one articulated support element is provided on the first member and the inter-locking means with which it engages is provided on the second member of an adjacent articulated support element.

7. A folding table, stool or the like support according to claim 5 or 6, in which the interlocking means are resilient projections.

8. A folding table, stool or like support according to claim 4, wherein the flange of the first member is provided adjacent its hinge connection with a downwardly extending pro-jection and the flange of the second member of an adjacent articulated support element is provided adjacent its hinge connection with an upwardly extending projection, the projections being engageable when the articulated support elements are in the upright position and being resiliently deformable releasably to lock the articulated support elements in the upright position.

9. A folding table, stool or like support device compris-ing a top, a base and collapsible column means interconnecting the top and the base, the column means comprising more than two articulated support elements each comprising a first member having two spaced side edges and being pivotally connected at an upper end to the top and a second member having two spaced side edges and being pivotally connected at a lower end to the base, the first and second members being hingedly interconnected for pivoting outwardly with respect to a central axis extending through the top and the base to a collapsed position with the top adjacent the base and for pivoting inwardly with respect to the central axis to an over-centre upright position in which the side edges of each articulated support element are in engagement at least at the hinge portion with the side edge of the adjacent articulated support elements thereby to provide mutual support to maintain them in the upright position and in which the first and second members are formed as an integral plastics element having a web formed at their junction and serving as the hinged interconnection.

10. A folding table, stool or like support device compris-ing a top, a base and collapsible column means interconnecting the top and the base, the column means comprising more than two articulated support elements each comprising a first member having two spaced side edges and being pivotally connected at an upper end to the top and a second member having two spaced side edges and being pivotally connected at a lower end to the base, the first and second members being hingedly interconnected for pivoting outwardly with respect to a central axis extending through the top and the base to a collapsed position with the top adjacent the base and for pivoting inwardly with respect to the central axis to an over-centre upright position in which the side edges of each articulated support element are in engage-ment at least at the hinge portion with the side edges of the adjacent articulated support elements thereby to provide mutual support to maintain them in the upright position and in which locking means are provided on inner facing surfaces of both members of each articulated support element, the locking means being positioned and configured for interengagement when the articulated support elements are in the collapsed position releasably to lock them in that position.

11. A folding table, stool or the like according to claim 10, wherein the locking means comprise resiliently deform-able flange means.

12. A folding table, stool or the like according to claim 11 wherein a through hole is provided in each of the members of each articulated support element, the resiliently deformable flange means being provided around the periphery of the respective hole.