|Publication number||US1453171 A|
|Publication date||Apr 24, 1923|
|Filing date||Nov 14, 1921|
|Priority date||Nov 14, 1921|
|Publication number||US 1453171 A, US 1453171A, US-A-1453171, US1453171 A, US1453171A|
|Inventors||Oberwarth Leo L|
|Original Assignee||Oberwarth Leo L|
|Export Citation||BiBTeX, EndNote, RefMan|
|Referenced by (5), Classifications (4)|
|External Links: USPTO, USPTO Assignment, Espacenet|
' Apr. 24, 1923.
' L. L. UEERWARTH COLLAPSIBLE DRAWING BOARD Filed Nov. 14, 1921 Patented Apr 2d, 192?.
coniiarsintn nnavvine some.
Application filed November 1 1-. .1921. same no. 514,974.
in the combinations, COIlStPllCtlOTlfi-J, and arrangements herein described and claimed.
iincbject of my invention is to provide a collapsible. (brewing; board. :which comprises a minimum. number of parts and which can be quickly and readily assembled or disasseinbled;
.ihwfurther object ot i'ny invention is to provide a device of thei type described in which the. parts are 1 held rigidly together when assembled.
A! further object of my invention is to provide a device of the character described inwhich the partspthereof when disassembled can be packed. in a small space for trai'isportation.
11 turtherohjectpt my invention is to provide a device of the type described which siniple in constriiiction and is not likely to easily get out of order.
uother oh'jects'and advantageswill appear in the following specification, and the novel features of the inventionavill be partied larly pointed out in the a ipended. claims.
l\ly invention is illustrated in the accompanying drawings, foriiaing part of this a'ppilication, in Whichllirgrure 1 is a perspective View of the assembled hoard,
Figure 2 is a perspective view of the as seuibletl .hoarjd showing the underside thereof,
Figure 3 is a perspective view of the dis assembled board, the parts thereof being packed in a small space, and
Figure 4 is an. enlarged sectional. detail of a portion of the device.
In carrying out my invention, I provide two cleats 1-1, each of the cleats having a recess 2 therein. The recess 2 extends sub stantially the entire length of the cleat and has beveled end Walls 3. The portions l oi? the cleat 1 at each end of the recess 2 are provided with longitudinally extending grooves 5 therein. These grooves are angu lar in cross section, the lower surfaces there of lying in the same plane as the recess 2. it will thus be seen that these portions t are provided with walls that taper inwardly from the top thereof. The top 01 the board (5 is composed of three sections of material, 7, 8 and 9. The sections 7 and 9 are identical with respect to each other, each being provided with recesses 10 therein. The walls of these recesses are tapered inwardly from the top thereof and are adapted to abut the walls oi? the portions l; 'l Vhen the sections 7 and 9 are so disposed that the pertions i project into the recesses 10, it will be apparent that these sections cannot be moved vertically with respect to the cleats 1.. The edges 11 and 12 of the sections 7 and 9 are molded so that they taper outwardly from the top thereof. The center section 8 has its edges 13 and 1 1 molded so as to conform. with. the edges" 11 and 12, respectively, thus holding the sections 7 and 9 securely in place. lit will. be noted that the sections 7 and 9 are prevented from lateral movement with respect to the cleats 1 by means of the portions 41-. The section 8 is also prevented. from lateral movement by pins "15 which are carried by the cleats 1 and which project into openings in the under side the section. As clearly shown inFigure'et, the section 8 has a metal socket16 centrally dis posed therein. The socket 16 is adapted to receive a bolt 17 which in turn pivotally secures in place a metal strip 18 for a purpose now to be described. The cleats 1 are provided on the inner sides thereof with curved grooves 19 into which the ends of the metal strip 16 are adapted to project. It will thus be apparent that the strip 18 securely holds the section 8 in place.
From the foregoing description of the various parts oi? the device, the operation thereof may be readily understood. Inassenibhngr the device, the sections 7 and 9 ter can be inserted between. the sections 7 and- 9. The strip is then rotated so that the ends thereof enter the curved grooves 19. lit will be apparent that as the strip 18 is rotated firmly locked in place.
into parallelism, the section 8 will be more The board is now assembled and can be used in the same manner as an ordinary drawing board and is just as rigid and strong in construction as the boards of ordinary type.
In Figure 3, I have shown the board disassembled, the sections 7, 8, and 9 being piled one upon another and the cleats 1 being disposed thereabove. I have also shown a T- square 20 which has a head 21 hinged thereto. The T-square can therefore be disposed between the cleats 1 and be transported with the board.
In each of the ends of the cleats 1, I provide a bore 2-2 in which are adapted to be disposed drawing instruments, thumb tacks, erasers, etc. The bores 22 have covers 23 which are adapted to be disposed therein, thus effectually enclosing the content-s of the bores. The cleats 1 are provided with rubber or felt pads 24; which are disposed on the under side thereof. These pads prevent the cleats from marring the surface of the article on which the board is disposed.
As heretofore stated, it will be apparent that this device is very simple in construction, that it can be quickly and readily assembled or disassembled, and can be packed into a very small space.
1. A device of the type described comprising a board composed of three sections, the
end sections having recesses in one of their sides, transverse members, each having an arcuate groove therein and projections at the ends thereof, said projections being adapted to be received in the recesses of said end sections, whereby said end sections can only be moved toward each other, and. means carried'by the center section and adapted to be received in said arcuate grooves for locking said section in place with respect to said transverse members.
2. A device of the type described comprising a board composed of three sections, the end sections having recesses in one of their sides, transverse members, each having an arcuate groove therein and projections at the ends thereof, said pro ectlons being adapted to be received in the recesses of said end sections, whereby said end sections can only be moved toward each other, and means carried by the center section for locking said section in place with respect to said transverse members, said means comprising a strip pivotally secured to the center board, the ends thereof being adapted to enter the arcuate grooves in said transverse members.
3. A device of the type described comprising a board composed of three sections, the end sections having recesses in one of their sides, transverse members, each having an arcuate groove therein and a projection at the ends thereof, pins carried by said transverse members, said projections being adapted to be received in the recesses of said end sections, whereby said end sections can only be moved toward each other. and means carried by the center section for locking said section in place with respect to said transverse members, said means comprising said pins which are adapted to be received in openings in said center section, and a strip pivotally secured to the center board. the ends thereof being adapted to enter the arcuate grooves in said transverse men'ibers.
i. A drawing board comprising a plurality of sections capable of being assembled edge to edge to provide a smooth surface, said end boards having recesses therein with tapered walls, transverse members having projections at the ends thereof and adapted to be received in said recesses, said projections having tapering walls, whereby said end boards are prevented from outward, upward, or lateral movement with respect to said transverse members, the contacting edges of said boards being fashioned so as to hold each other in the same plane. said transverse members having arcuatie-shaped grooves, means for preventing lateral move ment of the central board with respect to said transverse members. a spring strip operatively carried by said central board, said arcuate-shaped grooves being adapted to receive the ends of said strip and to flex said strip so as to hold said central board in place, whereby said drawing board can be readily assembled or disassembled without the aid of tools.
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