US1658683A

US1658683A - Straightedge

Info

Publication number: US1658683A
Application number: US742866A
Authority: US
Inventors: Jacob Alfred Peter
Original assignee: Individual
Current assignee: Individual
Priority date: 1924-10-10
Filing date: 1924-10-10
Publication date: 1928-02-07
Anticipated expiration: 1945-02-07

Description

Patented Feb. 7, 1928.

UNITED STATES V.AILEREID PETER JACOB, 0F NEW YORK, N'. Y.

STRAIGHTEDGE.

Application led ctober 10, 1924. Serial No. 742,866.

This invention relates to a straight ed e and has particular reference to a straig t edge for use in connection with drawing boards. I

The principal object of the invention is `to provide a straight edge :wherein the .cable and pulleys employed 1n devices of this nature, are concealed within the body to prevent the cable from interfering with its o perations, and which also prevents any liability of the cable froni slipping o if the pulleys, which is a` serious objection in the straight edges heretofore constructed, and which further prevents the sagging of the cable on the surface of the drawing, causing obliteration of the lines as occurs Ain straight edges where the cable passesalong a roove or opening `on its underside instead o passing through a conduit enclosed on all sides and which is the main feature of the present invention. y

.Another object of my present invention is. the provision of a straight edge for use in connection with a cable for lfacilitating the drawing of parallel straight lines-.on large work; the said straight edge being characterized b the capacity to receive and completely enc ose portions of the cable whereby the straight edge may be moved or manipulated without interference from the cable or any portion thereof.

To the attainment of the foregoing, the invention consists in the improvement as hereinafter described and definitely claimed.

In the accompanying drawings, forming part of this specification p Figure 1 is a plan view showing my noyel straight edge as properly arranged relative to a drawing board and a .cable associated with the board.

Figure 2 is an enlarged elevation 'showing one end of the straight edge and cable portions adjacent thereto.

Figure 3 is a longitudinal central section taken in the plane indicated by the line 3-3 of Figure 1.

Figure`4 is an enlar ed cross-section taken in the plane indicate by the line 4-4 of Figure 1. Y

milar numerals of reference designate corresponding parts in all of the views of the drawings. y

I show in Figure 1 a drawing board 1 together with a cable 2 and my novel straight edge 3 which is characterized by an enclosed longitudinal central conduit 4 for the pasits ends to the drawing board l and is looped over guides 6 on the vdrawing board and is passed over the sheaves 5 and through the conduit 4 in therelation shown by full and dotted lines in Figure 1 and by full lines in Fi ures 2 and Manifest y by the manipulation of straight edge 3 constructed and arranged as described parallel straight lines ma be made on large work with great facility; and it will be appreciated that b virtue of the cable being extended throug i the conduit 4 of the straight edge 3, the cable offers no y projection on the surfacev of strai ht edge 3, and therefore the said strai lit e ge l3 may be conveniently handled an moved without any liability of interference from the cable.

My novel straight edge 3 is preferably constructed in the manner shown in'Figiires 2, 3 and 4-i. e., the said straight edge comprises spaced longitudinal and parallel sections 7 of wood between the opposed longitudinal edges of which the before mentioned Vconduit 4 is formed, comparatively thin longitudinal edges of the sections 7 thin end plates 11 of metal, and rivets 12 extending through and connecting the sections 7, layers 8 and plates 11. It will also be observed that the sections 7 and' the layers 8 are recessed at the ends of the straight edge for the housing of the sheaves 5.

In theuse of my novel straight edge the cable 2 is arranged as shown in Figure 1, and in this con'nection it will be noted that the conduit 4 lends itself to the crossing of the portions of the cable 2 within the straight ed e 3 without the said cable ortions inter erring with the lateral ad]ust ment of the straight edge 3.

Notwithstanding the practical advantages ascribed to my novel straight edge, it will be manifest that the straight edge is simplel and inexpensive in construction and is well adapted to withstand the usage to which devices of this character are ordinarily subjected.

I have specifically described the construc-v tion embraced in the preferred embodiment of my invention in order to impart an exact Iunderstanding of said construction. I do not desire, however, to be understood as confining myself to the structure disclosed inasmuch as my invention is defined by my claim within the scope of which changes in structure may be made without departure from my invention.

Having described my invention, what I claim and desire to secure by Letters-Patent, f

'A straight edge comprising longitudinal spaced sections, comparatively thin layers secured to the respective sides of and spacing said sections and cooperating with the same 1n formin a longitudinal conduit through the strag t edge, said sections being recessed at their ends, thin plates arranged et the outer sides of the respective ends of said th1n layers, means connecting the sections, layers and lates, and sheaves mounted between the t in plates and disposed in the respective recesses and defining the ends of the said conduit.

0 In testimony whereof I hereby uiiix my signature.

ALFRED PETER JACOB.