US665259A - Compasses. - Google Patents

Description

Patented lan. I, IQOI. G. OBERBECK.

CDMPASSESY (Application filed Sept. 19, 1900..

(No Model.)

WIT/@55.55;

Nirnn STATES ATENT OFFICE.

GEORGE OBERBECK, OFJERSEY CITY, NEW JERSEY, ASSIGNOR TO THE EAGLE PENCIL COMPANY, OF NEW YORK, N. Y.

COMPASSES.

SPECIFICATION forming part of Letters Patent No. 665,259, dated January 1, 1901.

Application led September 19, 1900. Serial No. 30,476. (No model.) A

To LZZ whom it muy concern.-

Be it known that I, GEORGE OBERBnck, a citizen of the United States, residing at .I ersey City, in the State of New Jersey, have invented certain new and useful Improvements in Compasses, of which the following is a specification. I

The object of my invention is to provide simple, durable, and inexpensive compasses which will not be liable to get out of order; and it consists in a novel construction and arrangement of parts whereby a very eiicient article of the kind is produced.

In the accompanying drawings, Figure l is a side view of a pair of compasses provided with my improvements. Fig. 2 is an edge view showing the lever clamping arrangem ent for holding the lead-pencil in place. Fig. 3 is a cross-section on line 3 3 of Fig. l on an enlarged scale. Fig. 4E is an enlarged central vertical section through the clamp. Fig. 5 isV an enlarged section on line 5 5, Fig. l

In the accompanying drawings, ot a are the legs of the com passes, slightly curved, as seen in the drawings, which may be economically made of sheet metal of U-section, with corresponding circular earsb b at the upperends. One of the legs is represented as provided with a metal point c, which fits and is held in the lower end of the leg. The other caliperleg carries a longitudinally-slotted pencilholding tube cl, which is attached to the leg by solder, bracing, or other suitable means.

The pencil-holding tube is provided with ears e e on opposite sides of its longitudinal slot to receive the laterally-projecting pivotpins t' t" of the pencil-clamping lever, which pass through holes j j in the ears and are headed down on the latter, so as to keep them from spreading apart. The clamping-lever consists of a handle g, on the end of which nearest the pivots i t" is an inwardly-bent lip h, adapted to clamp or bite the pencil, the parts g h forming an angle-lever pivoted at the angle or elbowin the earse d. The clamping-lever is shown in clamping position in the drawings, more particularly in Fig. 4:. In this position the handle g lies close against the pencil-holding tube, so as to be quite out of the way, while the bent end h is turned inwardly, so that its acting end bites or grips the pencil. It will be noted that when thus placed the biting edge of the part h lies on the opposite side from the handle g of a plane passing longitudinally through the axis of the clamping-lever at right angles with the pencil, or, in other words, just a little beyond the point where it would bite hardest upon the pencil. Under this arrangement when the instrument is in use any pressure upon the point of the pencil will have the tendency to make the end h grip the pencil all the more tightly, and thus resist any tendency of the pencil to slide upward in the tube d.

la represents a linger-piece or handle provided at its upper end with a knob or sphere Z and having its opposite lower end formed as a circular disk m, corresponding in shape and size to the disks h h.

When the parts are assembled together, the ears or disks m h h nest together, the disk h of the leg a' fitting between the disks b of the leg o, and the disk m of the handle lo fitting snugly between the disks h' of the leg a'. To hold them together, a pin 0 passes axially through them, forming apivot upon which both the legs andthe handle may be moved each independently of the other. The pivot-piu passes also through the concavo-couvex spring-washers 'n n and is headed down upon them, all the parts of the joint being thus held together with spring-pressure.

A compass made in accordance with my invention is a convenient, inexpensive, and durable device and also very simple and easily adjusted.

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

In a pair of compasses, a pencil-holding device consisting of a pencil-receiving tube attached to one of the compass-legs, and an elbow or clamping lever g h pivoted at its angle to the pencil-receiving tube, and arranged so that when its part h is in position to grip the pencil, its handle part will be folded down upon or against the pencil-holding tube, as-and for the purposes hereinbefore set forth.

In testimony whereof I have hereunto set my hand this 10th day of September, 1900.

GEO. OBERBECK.

Witnesses:

SAMUEL KRAUs, P. H. BUCKMASTER.

Images