US2743551A - Drafting table paper crease-proof attachment - Google Patents

Description

May 1, 1956 GHONG-HUNG ZEE 2,743,551

DRAFTING TABLE PAPER GREASE-PROOF ATTACHMENT Filed Feb. 3. 1954 I N V EN TOR.

2,743,551 Patented May 1, 1956 DRAFTING TABLE PAPER CREASEqPROOF ATTACHMENT Chong-Hung Zee, New York, N. Y.

Application February 3, 1954, Serial No. 407,941 1 Claim. (Cl. 45--131) This invention relates generally to engineering drafting tables and more particularly to an engineering drafting table with a paper crease-proof attachment.

A primary object of this invention is to provide a paper crease-proof attachment at the edge of a drafting table adjacent to draftsmen for sliding a drawing sheet into the said attachment smoothly without creating any crease.

Another object of this invention, closely allied to the preceding object, is to provide the above mentioned attachment so that the upper edge of a drawing sheet may he slid through the said attachment towards the draftsman as much as desirable, thus the draftsman may always choose the mostconvenient working position on the table no matter on which part of the drawing sheet he works.

Still another object of this invention is to provide the said attachment as a sheltering place to protect against smearing of the part of the drawing sheet, which has been covered with sketches or figures, while a draftsman is Figure 1;

Figure 4 is a sectional view taken on the line 3--3 in Figure 1;

Figure 5 isthe same view as in Figure 3 but with a drawing sheet in place.

Referring now to the drawings in detail, the drafting table paper crease-proof attachment will be understood to comprise a structure which is secured upon a conventional drafting table or the like. The said attachment includes a metal trough 1 which is mounted on the edge of the drafting table adjacent to draftsmen by means of screws 4, and a horizontal board 2 or its equivalent which forms a compartment 6a for sheltering the drawing sheet 9 as shown in Figure 5. The trough 1 is mounted flush with the top of the drafting table board 3 so that the presence of the trough 1 will not interfere with a parallelstraightedge which is usually mounted on the top of a drafting table for drawing parallel lines. The edge of the drafting board 3 near the trough 1 is beveled at 3a, which will make an inlet 1a for the drawing sheet to he slid into the said compartment 6a. Furthermore, the beveled portion 3a of the drafting board 3 forms a transitional zone for the drawing sheet 9 before it reaches the inlet 1a; therefore it will be impossible to form a crease. The horizontal board 2 is secured to the drawing board 3 through two abutment members 6, which provide a space for said compartment 6a, by means of screws 5. The horizontal board 2 is connected to the trough 1 by screws 7. The members 8 beside the abutment members 6 are usual supporting members for the drafting board 3 of a drafting table.

The operation of this attachment will be clearly understood from a consideration of the foregoing description and is best illustrated in Figure 5 as a drawing sheet 9 being put in place.

It is of course to be understood that the invention is not restricted to the specific form of embodiment illustrated and described. Various modifications and variations may be made in and from the constructional detail shown.

What I claim is:

A drafting table paper crease-proof attachment securable to the edge of a drafting table, said edge being adjacent to a draftsman; said attachment comprising a metal trough having approximately cylindrical surface inside and being secured to the end portions of said edge of said table and being mounted flush with the top of said table, a beveled edge extending approximately the entire length of said edge of said table and being connected by a smooth circular curve which is formed by cutting: said edge of said table, so as to form a longitudinal slot between said trough and said edge of said table, and a compartment being underneath the drafting board of said table and constituting a continuation of said slot for sheltering a drawing sheet.

References Cited in the file of this patent UNITED STATES PATENTS 222,047 Holden Nov. 25, 1879 794,359 King July 11, 1905 2,508,470 Ritter May 23, 1950 2,603,908 Schwefel July 22, 1952

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