US723041A - Compass. - Google Patents

Description

PATENTED MAR. 17 1903.-

W. SGHWARZER.

GOMPASSESr APPLICATION FILED MAR.13, 1901.

H0 MODEL.

- UNITE ST TES PATENT FFICEV.

SCHOENNER, OF NUREMBERG, GERMANY.

COMPASS.

SPECIFICATION forming part of Letters Patent No. 72 dated March 17, 1903-, Application filed March 13, 1901- Serial No. 50.986- (No model) To all whom, it may concern:

,-Be it known that I, NVILHELM SCHWARZER,

asu'bjeot of the German Emperor, and a resiinvented new and useful Improvements in Compasses, of which the following is a full, clear, and exact description. r l The presentinvention relates to compasses;

a. and it consists of means for retaining the handle at the top of the compass ,always perpendicnlar toi. e.,c0incident witha line bisecting the angle at which the legs of the compass stand. i

In order to render the present specification easilyintelligible, reference is had to'the accompanying drawings, in which similar letters of reference denote similar parts through out the several views. a

Figure 1 is a sectional elevation; Fig. 2, a vertical cross-sectional elevation along the center'line oi the compass. Fig.- 3 is a sec-.

" tional elevation with the legs spread; Fig.

4, a cross-section on line A A of Fig. 1, and Fig. 5 a similar section on line B B of Fig. 3. Figs. 6 to Sshow a modified form embodying the invention, Fig. 6 being a sectional elevation showing one leg of the compass removed from the pivot and the front leg of the handle-supporting bow cut away. Fig. 7 is a side elevation; and Fig. 8 a similar sectional elevation to that of Fig. 6, but with the legs spread.

The legs 9 g of the compass are fitted to their pivot dby means of the disks a: ain the a 35. a a a movable disk bis mounted. The pivot well-known manner, and between the disks y a d has its ends supported by threaded connections with the armsk 7c of the yoke forming part of the handle 70. This disk b has a vertical slot 0, which may move over the pivot d, and at either side of the said slot horizontal slots f f.- The pivot dis provided at oneend with a head and on the other with a screw thread, on which a nut is screwed. The inner ends of the head and nut are of conical form and are laid into corresponding conical depressions in the shank-head joint-hinges a.

The head and the nut of the pivot d are provided with threads on their circumference p d. r The head and the not of the pivot 11 prowhich have apitch opposite that of the pivot ,WI LHELM SCHWARZER, OF NUREMBERG, GERMANY, ASSIGN'OETO eEoRe ject loosely through the opening in the hanconical inner ends of the head and nut oi the pivots d are of course not provided with threads, but have a perfectly smooth circumference in order to fit into the conical depressions in theshank-head joints. Both disks 1. a are provided on their inner faces with pins 6 6, adapted to engage in the slots f f. Thus the pin of one disk 0. engages the horizontal slot f at one side of the vertical slot, while the pin of the other leg-disk engages the opposite slot of the said disk b.

From the above description it will be clear that when the legs of the compass are spread apart, as illustrated in Fig. 3, the pins 6- e tending arm h, which is in a line with the cen-.

ter line of the angle formed by the legs of the compass, and thus the handle 70 will be retained always in line with the line bisecting the angle formed by the said compass-legs, as will be readily understood. 1

For the stronger class of compasses the device as modified according to Figs. 6 to 8 is advantageously employed in order to obviate the possibility of the guide-arm h breaking 01f. In this case the said disk b is provided with upwardly-extending guide-arms Z l,which embrace the top of the bow of the handle it instead of one guide-arm extending into a boring of the said handle. The device is otherwise the same as that described with reference to Figs. 1 to 5 and needs no fur- .ther elucidation.

I claimas my invention- In a compass, the combination of a disk the vertical 3101;, an inwardly-extending pin In witness whereof I have hereunto set my fixed on each of the compass-leg disks one pin hand in presence of two Witnesses.

extendin into each slot and uide-arms on r the said d isk to embracethe upier part of the WILHELM E bow of the compass and enable the disk to \Vltnesses:

slide relatively to the same substantially as OSCAR BOCK,

described. ANDREAS STICH.

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