US187871A

US187871A - Improvement in instruments for draftsmen

Info

Publication number: US187871A
Authority: US
Publication date: 1877-02-27
Anticipated expiration: 1894-02-27

Description

A. LANGERFELD.

INSTRUMENTS FOR DRAFTSMEN.

No.187,871. Patented Feb. 27, 1877.

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. I WITNESSES={ mvsmon:

///7, I n A N4 PETERS. FHQTO-LIYHOGRAPHER. WASHINGTON. D C.

UNITED STATES PATENT OFFICE.

ARTHUR LANGERFELD, OF NEW YORK, N. Y.

IMPROVEMENT IN INSTRUMENTS FOR DRAFTSMEN.

Specification forming part of Letters Patent No. 187,871, dated February 27, 1877; application filed December 22, 1876.

To all whom it may concern:

Be it known that I, ARTHUR LANGERFELD', of the city, county, and State of New York,

have invented a new and useful Improvement in Draftsmens Instruments, which improvement is fully set forth in the following specification and accompanying drawing, in which Figure 1 is an oblique view; Fig. 2, a central section. and Fig. 3 a longitudinal section, of the same.

The objects of my invention are, to furnish an instrument by which thumb-tacks can be extracted without making use of and thereby injuring the draftsmans finger-nails or penknife; and to furnish a protection for the thumb when impressing a thumb-tack; especially to prevent the steel peg from injuring the draftsmans thumb in case the peg should come through the head of the thumb-tack; and to furnish a ready means of removing drawing-paper which has been glued onto the board, and to fold, cut, and smooth the drawlug-paper.

In the drawing, 0 is a small semicircular notch, which is to receive the peg of the thumb-tack. On this end the instrument is shaped like a wedge. E is a hollow, which is to be placed over the head of the thumb tack when the thumb-tack is to be impressed. A D B is a flat handle, which may have any outline, and which has a sharp edge on at least one side, as is shown in the central section A B. This handle is used as a paper-knife, paper-folder, and paper-smoother.

The instrument is bent shortly after the hollow E, so that while the wedge-shaped end rests flat on aplane surface, (like a drawingboard,) the handle AB D will stick up so that it can be held in the hand.

It will be seen that when a thumb-tack is to be extracted, the wedge-shaped end of the instrument can not be forced farther than halfway under the thumb-tack, on account of the semicircular notch not allowing more than half of the peg of the thumb-tack to go into it. This will prevent the peg from being bent when the thumb-tack is extracted by pressing downward on the handle A D B, because the upward pressure will be under a central line of the thumb-tack, and not on one side of it, as it would be it the notch were deeper.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is-

The instrument for draftsmen, consisting of the wedge, with notch G, the indenture at E, the following bend, and the fiat handle A D B, shaped like a paper-knife, substantially as described, and for the purposes set forth.

ARTHUR LAN GERFELD.

Witnesses:

CHARLES JAMES LANGERFELD, OTTO LADDEY.