US 3729244 A
A collapsible desk made of foldable sheet material comprising a pair of folding pedestals and a separably interconnecting top assembly which includes a top panel and three adjoining folding panels on each of two opposite sides of the top panel which fold to form a pair of parallel frame members. The pedestals are interconnected with cooperating tabs and slots to the top assembly between the frame members.
Description (OCR text may contain errors)
United States Patent 1191 Butler  3,729,244 1451 Apr. 24, 1973 COLLAPSIBLE DESK  Inventor: William M. Butler, Ottawa, Ontario,
Canada  Assignee: Canadian Patents and Development Limited, Ottawa, Ontario, Canada 22 Filed: Apr. 24, 1972 21] Appl. No.: 246,638
312/259  Int. Cl. ..A47b 41/00, A47b 3/06  Field ofSearch ..108/157, 115,111, 108/150; 297/440, 442; 248/174; 312/195, 259; S/DIG. l
[ 56] References Cited.
UNITED STATES PATENTS 3,212,464 10/1965 Steuer ..297/440 1,392,998 10/1921 Williams ..3 12/195 FOREIGN PATENTS OR APPLICATIONS Germany ..3 12/195 France 108/157 Primary Examiner-Francis Zugel Assistant Examiner-Kenneth J. Dorner Attorney-R. G. Bitner  ABSTRACT A collapsible desk made of foldable sheet material comprising a pair of folding pedestals and a separably interconnecting top assembly which includes a top panel and three adjoining folding panels on each of two opposite sides of the top panel which fold to form a pair of parallel frame members. The pedestals are interconnected with cooperating tabs and slots to the top assembly between the frame members.
4 Claims, 7 Drawing Figures Patented April 24, 1973 3 Sheets-Sheet l Patented April 24, 1973 5 Sheets-Sheet 5 COLLAPSIBLE DESK This invention relates to a collapsible desk made of foldable sheet material.
Although collapsible desks made of foldable sheet material are known, they are not entirely satisfactory with regard to rigidity, ease of assembly and disassembly, and cost. US. Pat. No. 3,212,464 describes one such desk. It was found, however, that this desk is not entirely satisfactory with regard to rigidity, and its top surface dimensions. The front to back dimension of the top cannot be increased to a more convenient larger size without reducing the leg room or rigidity.
The present invention provides a rigid collapsible desk which is convenient to use, assemble and disassemble, and makes efficient use of sheet material for low cost. The invention generally comprises a pair of folding pedestals adapted to be separably interconnected with a top assembly which includes a top panel and three adjoining folding panels on each of two opposite sides of the top panel which fold to form a pair of parallel frame members. The top assembly and pedestals are secured by interconnecting tabs and slots between the frame members.
The invention will be described with reference to the drawings which illustrate embodiments of the invention and in which:
FIG. I is a perspective view of the'assembled desk.
FIG. 2 is a flat blank which makes up one embodiment of the pedestal.
FIG. 3 is a simplified flat blank which makes up another embodiment of the pedestal.
FIG. 4 is a perspective view of the completed pedestal made from the blank of FIG. 2.
FIG. 5 is a flat blank which takes up the top assembly.
FIG. 6 is a perspective view of the folded top assembly shown inverted.
FIG. 7 is a fragmented sectional view taken at line VII VII ofFIG. 1.
Referring to FIG. 1 the invention comprises a top assembly 1 and a pair of folding pedestals 20. Blanks for the pedestals are shown in FIGS. 2 and 3. With reference to FIG. 2 the pedestals are made up of a blank 21 which is folded at score lines 22, 23, 24 and 25 to form four walls 26, 27, 28 and 29 and a flap 30 for joining wall 29 to wall 26 as in FIG. 4. The two opposite end walls 26 and 28 have tabs 31 and 32 define d by cuts 33 and 34 respectively, in the end walls.
With reference to FIG. 5, the top assembly is made from a blank 2 having a top panel 3 and three adjoining frame forming panels on each of two opposite edges 7 of the top panel 3. Each group of three panels comprises a first panel 4 adjoining the top panel 3, a second panel 5 adjoining the first panel and a third adjoining outer panel 6. The three panels are adapted for folding,
about parallel score lines 7, 8 and 9 into right trinagular tubular frame members 16 and 17 as shown in FIG. 6. In each frame member the panel 5 is perpendicular to the top panel 3. The flap 6 is contiguous with the lower side 15 of the top panel 3 with the outer edge 10 thereof extending to the score line 7. The flaps 5 of the folded frame members are spaced from one another a distance substantially equal to the spacing of the tabs 31 and 32 of the pedestal as shown in FIG. 4. The blank 2 has two pairs of slots 11, 12 and l3, 14 along the score line 8 between panels 4 and 5. Each pair of slots, for example 11 and 13, are adapted to receive the tabs 31 and 32, respectively, of the pedestal.
Preferably the pedestal blank as shown in FIG. 2 includes a pair of locking flaps 35 foldable at score line 36 and extending from the top of the walls 26 and 28 which form opposite walls in the assembled pedestal of FIG. 4. The flaps 35 lock the pedestals with the top assembly increasing the rigidity of the assembled desk. The flaps also increase the strength of the pedestals by interconnecting the portion of the walls 26 and 28 which are separated by the tab forming cuts 33 and 34.
With reference to FIG. 2 the tabs 31 and 32 extend upwardly short of the top edge of the pedestal to accommodate the thickness of the locking flaps 35 and panel 6 of the top assembly. This allows the top panel to lie substantially flush with the entire top edge of the pedestals as can be best seen in FIG. 7.
In the embodiment of FIG. 3 the top edges of the tabs 41 and 42 extend to the top edge of the pedestal blank. The tabs may be bent outwardly within the frame memberto accommodate the thickness of the panel 6 of the top assembly when assembled to allow the top panel to rest on the top edge of the pedestal.
In FIG. 2 the cuts 33 and 34 which define the tabs 31 and 32 extend vertically to the score line 36 so that a portion 37 below the fold line 36 and above the tab pivots with the flap 35. In another embodiment, the tab may be defined by a simple inverted U-shaped cut below the fold line 36.
Details of the assembled desk can be best seen in FIG. 7. To assemble, the panels of the top assembly are folded to approximate the configuration shown in FIG. 6. Each of the pedestals are unflattened and with the locking flaps 35 projecting upwardly, the upper portion of the pedestal is positioned between the frame member 16 and 17. As the pedestal and top assembly are brought together the tabs 31 and 32 are inserted into their respective slots 12 and 14. The flap 35 is then directed outwardly between the lower surface 15 of the top panel and the outer panel 6. This is made possible by the flexibility of the top panel which must be bent somewhat to make way for the locking flap 35. When both pedestals and top assembly are interconnected as in FIG. 7 a rigid structure is obtained. For disassembling, the procedure is essentially the reverse of assembly. The separated top assembly and the pedestals may each be folded flat for storage or for transport.
The desk incorporating the pedestal of FIG. 3, without the top locking flaps has a simpler blank form, and is easier to assemble and disassemble, but does not yield a desk as rigid as does the pedestal of FIG. 2.
In FIG. 2 the flap 30 is joined to the opposite wall 26 by any means such as the standard manufactures joint using glue, or stapling. The pedestal of FIG. 3 does not include a flap for interconnecting walls 26 and 29, which must be foldably interconnected by other means such as taping.
While the desk may be made any size it was found a convenient size for a desk made of corrugated fiberboard consisted of pedestals 30 inches high and having a rectangular cross section of 10 X 20 inches, and a top 48 X 40 inches with the cross sectional dimensions of the right-triangular frame member being approximately 4 X 4 Y4 X 7 inches. The spacing of the pedestals which was 23 inches is dictated by the lateral spacing of the slots, and is chosen to provide the required leg room. The length of the locking flap 35 was 2 inches.
It should be noted that ifa very rigid material is used, the flap 35 will necessarily be relatively short to allow it to be pivoted into place beneath the top panel during assembly.
The desk may be made of any material that is rigid and foldable, for example corrugated fiberboard, heavy cardboard, pressboard, and the like. The material used may be made moisture and/or fire resistant if required, and it may be colored.
Scoring of the blanks is done rather than cutting.
The above description is not to exclude the addition of features such as a modesty panel, shelves, drawers, and the like, if required.
What is claimed is:
l. A collapsible desk made of foldable sheet material comprising a pair of folding rectangular pedestals and a separably interconnecting folding top assembly, each of the pedestals made up of a sheet folded to form four walls and having means for foldably joining the ends of said sheet, each of the pedestals having an upwardly projecting tab on the upper portion of each of two opposite walls, said top assembly comprising a top panel and three integrally adjoining frame forming panels on each of two opposite edges of said top panel, each group of three panels comprising a first panel adjoining said top panel, a second panel adjoining said first panel and a third adjoining outer panel, each group of three preferably by crushing panels being adapted for folding along score lines parallel with said opposite edges into a right-triangular tubular frame member, each folded frame member having the second panel disposed perpendicular to said top panel and spaced inwardly from said edge of said top panel, said third panel being contiguous with the lower surface of the top panel with the outer edge thereof extending to the score line between the top panel and said first panel, the two second panels of the folded frame members being spaced from one another a distance substantially equal to the spacing of said tabs of each of said pedestals, a pair of slots in each frame member disposed along the score line between the first and second panels, said slots being adapted to receive the tabs of said pedestals for interconnecting the top portion of each of said pedestals with said top assembly between said frame members.
2. The desk of claim 1 further comprising a locking flap extending from the top of said two opposite walls of each pedestal, each flap adapted to be positioned between the lower surface of said top panel and the third panel of the folded frame member.
3. The desk of claim 1 wherein the means for joining the ends of the pedestal sheet comprises a folding flap integrally connected with one end of said sheet, said flap adapted to be joined with the other end of said sheet.
4. The desk of claim 2 wherein the top edge of each of said tabs is disposed below the top edge of said pedestal.