US485339A - Moritz ullmann - Google Patents

Description

(No Model.)

M. ULLMANN.

GALIPBB. JOINT.

No. 485,339. Patented Nov. l, 1892.

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UNITED STATESv PATENT GFFICE.

MORITZ ULLMANN, OF STUTTGART, GERMANY.

CALlPER-JOINT.

SPECIFICATION forming part of Letters Patent No. 485,339, dated November 1, 1892.

Application filed July l, 1892. Serial No.438,`701 (No model.)

To @ZZ whom t may concern,.-

Be it known that I, MORITZ ULLMANN, a

citizen of the Kingdom of Wrtemberg, residing at Stuttgart, in the Empire of Germany, have invented a certain new and useful Improvement in Compasses; and I do hereby declare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which it appertains to make and use the same. rlhe object of the present invention is to automatically spread the two legs of compasses or dividers by a spiral spring located in the head of the same, so that in setting them to any desired measurement the two legs must be pressed together. When the legs have attained the desired relative position, they are automatically retained in their position of adjustment by a spring-dog secured to one leg and pressed against the thimble or casing of the other leg until by pressing upon the dog the same is released from the thimble, so as to permit the two legs to be again automatically spread apart by the action of the spiral spring.

In the accompanying drawings, Figure l represents a longitudinal section of a pair of Compasses or dividers embodying my invention, the lower portions being broken away; Figs. 2 `and 4, a front and side elevation, respectively, of one of the divider-legs removed; Figs. 3 and 5, similar views, respectively, of the other divider-leg.

The leg A is provided with a hollow head or thimble d, into which iits the hollow thimble or pivot h of the leg B, being connected with the same by a screw c, fastened in the thimble d. Within the thimble b is arranged a spiral spring s, one end of which is secured to the screw-stud c, while the other end is secured to the thimble b, so that by the resiliency of the spring s thus arranged in the hinge of the dividers the legs A and B are spread apart. The spring-dog f, fastened to the leg B, bears against the periphery of the hollow head I a. of the leg A with its toe f', as shown. The dog f must be arranged with relation to the thimble a in such manner that its pressure will be sufficient to overcome the power of the spiral spring s. By this arrangement the tendency of the legs A and B to spread apart serves to hold the dog f against the periphery of thimble a, the dog f being tightly jammed or wedged against the same and securely holds the legs in the relative position which they may occupy. The toe f is readily released by a slight pressure upon the tongue f2, projecting from the leg B, and the dividers may then be again set as desired. Similar automatic clamping devices may also be applied to the joints of lead-carriers, bowpin attachments, and extensions for dividers or Compasses.

I claiml. In dividers, the combination, with a divider-leg provided with a hollow head or thimble integral therewith and a central stud, of a second divider-leg provided with a hollow head or thimble integral therewith and fitting into the thimble of the first divider-leg, a spring connected to the stud and to the thimble of the second divider-leg, and means for holding the divider-legs in any position of adjustment, substantially as set forth.

2. In dividers, the combination of two di- Vider-legs having thimbles iitting one within the other,with a spiral spring connected with its respective ends to the two dividerdegs, and a spring-dog attached to the one dividerleg and bearing against the thimble of the other divider-leg, substantially as set forth.

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

MORITZ ULLMANN. Witnesses:

AUGUST B. DRAUTZ, CARL HARTIG.

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