US332244A - Spring-calipers - Google Patents

Description

(No Model.)

E. s, FIELD.

SPRING GALIPER'S. No. 332,244. Patented Dec. 15, 1885.

Fig.1

UNITED STATES PATENT OFFICE.

EDWIN S. FIELD, OF SPRINGFIFILD, ASSIGNOR OF ONE-HALF TO JOSEPH M. DAVIS AND JOHN G. SODERBERG, OF WORCESTER, MASSACHUSETTS.

SPRING-CALIPERS.

SPECIFICATION forming part of Letters Patent No. 332,244, dated December 15, 1885.

Application filed September 17, 1884. Serial No. 143,319. (No model.)

To all whom it may concern.-

' Be it known that I, EDWIN S. FIELD, a citizen of the United States, residing at Springfield, in the county of Hampden and State of Massachusetts, have invented a new and useful Improvement in Spring Calipers and Dividers and like Articles, of which the following is a specification.

My invention relates to spring calipers having the bow or spring made separate from the legs; and the objects of my improvements are, first, to lessen the cost of manufacture; second, by making one bow or spring sufficient for two or more tools. I attain these objects by the mechanism illustrated in the accompanying drawings, in which Figure 1 is a top view of the bow before bending. Fig. 2 is a sectional view of a leg, one end armed with a hook; Fig. 3, a view of the calipers assembled; Fig. 4, a view of legs of different tools,- Fig. 5, a view of bow and legs in the act of assembling.

Similar letters refer to similar parts throughout the several views.

The bow or springA is preferably cut from sheet-steel of suitable thickness, and the holes (2 punched or prepared before bending. At the present time in the manufacture of calipers the bow and legs are forged in one piece, and when a bow breaks, as olten occurs, the whole forging with the labor thereon has to be thrown away.

In my invention, if a bow breaks, which is not as liable to happen, the loss is very small, as it is practicable to use better stock and obtain a better temper at a less cost for material, while the legs can be made of a lower grade of steel or other material easier to work.

I have petitioned for and described my in vention as spring calipers and dividers. A difference in the shape of the legs 0 0 makes different tools. Pointed straight legs, as h in Fig. 4, make dividers. One leg bent as O in Fig. 3, with the other straight as G in Fig. 4, makes what is called key-hole calipers, and so on. One bow will answer for all oombiuations, and it is my design to place them on the market with one bow and different-shaped legs, so the purchaser can make what combination he wishes without being to great expense, as is now the case.

In assembling, the books I) b on the end of legs 0 O, as shown in b, Fig. 2, interlock in the aperture d of thebow A,which is left open enough from a true circle, as in Fig. 5, to give the necessary spring or tension. The legs are then brought together, the screw F pushed through the holes in the legsmade for its reception, and the nut E, Fig. 3, or other suitable contrivance, is screwed or put onto the screw F or its equivalent. This holds them firmly in place,and they are ready for use.

I claim as my improvement 1. In calipers and dividers, the combination of the spring A, provided with apertures d d, with the legs 0 0, formed with hooks b b to enter said apertures, substantially as described.

2. In calipers and dividers, the combination of the legs 0 O, formed with books I) b, and the interlocking spring A,provided with apertures for the reception of the hooks b b, with the screw F and nut E, substantially as described.

3. In calipers and dividers, the combination of the interlocking spring Awit-h the legs 0 0, formed with books I) b, entering apertures in the spring,whereby said legs may be removed and others substituted therefor, substantially as described.

EDWVIN S. FIELD.

Witnesses:

RALPH W. ELLIs, THOMAS B. WARREN.

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