US857185A - Compass-handle-adjusting device. - Google Patents

Description

PATENTED, JUNE 18,1907. o. G. MAYBE. coMPAss HANDLE ADJUSTING DEVICE.

APPLIUATION FILED JUNE 23,1906

oTTo G. MAYER, or STUTTGART, GERMANY.

COMPASS-HANDLE-ADJUSTING DEVICE.

Specification of Letters Patent.

Patented June 18, 1907.

Application filed June 23,1906. Serial No. 323,006.

To @ZZ whom, t moby concern:

Be it known that I, OTTO G. MAYER, a citi- Zen ofthe German Empire, residing at Stuttgart, in the Kingdom of Wrtemberg, Germany, have invented certain new and useful Improvements in and Relating to Compass- Handle-Adjusting Devices, of which the following is a description, reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon.

This invention relates to means employed in connection with a compass, whereby the handle will be automatically maintained in the middle position, or a position equidistant relative to both legs of the compass, at all positions of the compass-legs.

The improvement comprises disks, lying side by side, pivoted together and located between the heads of the compass, so as to control the movements of an arm, which enters the hollow handle of the compass, and adjusts the said handle to the middle position desired.

Referring to the drawings, Figure 1 is a side view of a compass, shown broken away `at about the line B-B, provided with my improvements, Fig. 2 is a sectional view, at right angles to Fig. l and on about the line A-A of such figure g Fig. 3 is a view, similar to Fig. l of the position of the parts when the compass is partly opened 5 Fig.` 4 is a like view, showing the compass o en to a wide extent; Fig. 5 is a sectional etail at about the line C-C of Fig. 4.

In the form of the invention illustrated, the compass is provided with a handle having the hollow or bore y therein, and said handle is connected with a hollow frame, c, with its bore in line with the bore y, and having .depending arms, c, c. are pivotally fitted two compass-heads, R and S, each having provided, at the center of its outer face with a conical recess. .Through each of the arms c, I provide threaded openings alined with the conical recesses before mentioned, and in each of said openings I fit threaded screws O whose inner ends are formed to closely fit the said conical recesses. Oneof said heads (It) is provided upon the center of its inner face with a pin d, `and said pin rotatively fits into a recess at the center of the inner face of the head S.

Between the heads R and S, I tit two thin metal disks or plates, f and m, each of which is provided with a lower slot 7c (considerably Between said legs wider than and through which the described pin d passes) and with a single small opening at one side of said slot and about midway of the length thereof. As will be seen upon referring to Figs. 1, 3 and 5, the small openving of one disk is at the right of the slots in the disks, while the small opening of the other disk is at the left of the slots.

One compass head (S, connected to compass-leg a) is provided with a pin iat one side of the pivot-and said pin fits loosely into the small opening in the adjacent disk (m), and the compass head R (connected with leg b) is provided with a pin e, at the opposite side of the pivot, which fits loosely into the small opening in the disk f, lying adjacent thereto and side by side with disk m. Each disk f and 'm is also provided, at its upper edge, with slots Q, parallel with each other and with the slot 7c, and both disks are pivotally secured together, by means of a rivet Z, at their upper edges and between the two slots Q. An arm g is also connected, preferably by the rivet Z above named, to the adjusting means, and such arm slidably fits within the hollow or bore y of the handle. The connection of the arm is such that it will have a restricted movement about the rivet Z.

In practical operation, whenever a compass-leg is moved, the other leg will also be correspondingly moved, while the handle x will always be adjusted to the middle position. Thus, if the compass legs are moved closer to one another, the pin e (on head It) will pull the disk f (which freely slides, upon pin CZ, by reason of the rocking of the slot which is wider than said pin) downwardly, and said disk will also, by reason of the connecting rivet Z, pull the disk m downwardly and with it the leg a, rocking said disk m (as shown in Fig. 3). oppositely to disk f. In the same manner, the movement of the compasslegs apart will be egualized. In any event, however, the hand justed to the middle position, by reason of both disks f and m, when moving relatively to the'compass-heads, sliding freely upon the .pin d, and with the slots Q (which are wider than the sides of the hollow body c) freely sliding upon the outside of said body 5 thearm g being also slidably housed within the handle x, maintain such handle in the middle osition at all positions of the disks f and m.

n opening and closing the compass-legs, the two disks f and m move about the pins e IOO e Qc will always be adand i (acting as pivots located in the compass-heads at points lying equidistant from and at op osite sides of the plane of symmetry of t e compass-legs), and as the two disks are pivotally connected together by the pin Z, the latter and also the arm g also` remain at the middle position, no matter what the degree of opening of the compass.

cured to the pivot connecting said disks and slidably engaging the handle aforesaid.

2. A device secured to a compass for automatically retaining the handle thereof in the middle osition, comprising a pair of disks locatec between the compass-heads, each disk being pivotally connected with one compass-head only, the ivots for said disks being located respective y in said heads at points lying equidistant from and at opposite sides of the plane of symmetry of the compass-legs, the two disks being pivoted together, and an arm secured to the pivot connecting said disks and slidably engaging the handle aforesaid.

3. A device secured to a compass for automatically retaining the handle thereof in the middle position, comprising a pair of disks located between and pivotally connected with the compass-heads, each disk being provided with a slot through which the pivot ofthe compass-heads asses andthe pivots for said disks being lbcated respectively at opposite sides of the slots aforesaid, the two disks being pivoted together, and an arm secured to the pivot connecting said disks and slidably engaging the handles aforesaid.

4. A compass having a hollow handle and a hollow head provided with arms, compassheads pivoted between said arms, a pair of disks pivotally connected together and located between said compass-heads and pivots engaging each compass-leg with one only of the disks, said disks having slots for engaging the side-walls of the hollow head and slots for the pivot of the compass heads, and an arm secured to the pivot connecting said disks and slidablv engaging the handle aforesaid. l

In testimony whereof I aflix my signature. in presence of two witnesses.

OTTO G. MAYER.

Witnesses:

WALTER SoHwAEBEoH, RUDOLF BRECHT.

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