US230420A - Manuel w - Google Patents

Description

(No Model.)

M. W. KAHLE. Combined Caliper and Scribe. No. 230,420. Patented July 27,- I880.

Inventor Jydomg.

N-PETERS, PHOTO-UTNOGRAPNER. WASHINGTON, D. C

UNITED STATES PATENT OFFICE.

MANUEL W. KAHLE, OF DUKE CENTRE, PENNSYLVANIA, ASSIGNOR TO MARTHA JANE KAHLE, OF'SAME PLACE.

COMBINED CALIPERS AND SCRIBER.

SPECIFICATION forming part of Letters Patent No. 230,420, dated July 27, 1880.

Application filed May 17, 1880.

To all whpm it may concern:

Be it known that I, MANUEL W. KAHLE, of Duke Centre, in the county of McKean and State of Pennsylvania, have invented certain new and useful Improvements on a Combined Calipers and Scriber; andIdo hereby declare that the following description of my said invention, taken in connection with the accompanying sheet of drawings, forms a full, clear, and exact specification, which will enable others skilled in the art to which it appertains to make and use the same.

This invention has general reference to a combined calipers and center-scriber; and it consists, essentially, in the peculiar combination of parts and details of construction, as hereinafter first fully set forth and described, and then pointed out in the claims.

In the drawings already mentioned, which serve to illustrate my said invention more fully, Figure l is a front elevation of my said calipers. Fig. 2 is a transverse sectional elevation of the same. Fig. 3 is a vertical elevation of a modified form of my said calipers. Fig. 4 is an edge view of the same, and Fig. ,5 is a transverse sectional elevation on an enlarged scale.

Like parts are designated by corresponding letters of reference in all the figures.

The object of my present invention is the production of a pair of calipers or other measuring-instrument having a pair of legs, by means of which the center line of any flat or angular piece of work or the center of any circular piece can be instantly found and scribed.

To this end my improved calipers consist, essentially, of a pair of arms or legs, A A, having on their upper end a segment, C, the face of which is provided with fine teeth or cogs D. These two legs are pivoted to a tube, E, by means of pins or similar device B passing through lugs G on the lower end of said tube E. On the upper extremity of this tube there is provided a bevel-pinion, H, engaging with its teeth those of the segments C. Centrally through the tube E is passed a cylindrical pointed rod, I, serving as a scriber, as'hereinafter to be described. The upper part of the pinion H is formed into a milled head, J, by means of which said pinion is revolved. In

(No model.)

the lower end of the tube E is placed a setscrew, K, to retain the scriber I in any desired position.

Instead of pivoting the legsAA in the lugs G, as shown in Figs. 1, 2, and 5, I may pivot the same, as shown in Figs. 3 and 4:, which modification, however, does not alter the operation of my device.

The operation of my combined calipers and center-scriber is substantially as follows: By withdrawing the central rod or scriber, I,which is made a nice sliding fit in the tube E, from said tube, or by drawing it far enough out so as not to interfere with the taking of ineasures, my device is a perfect pair of calipers for measuring external thicknesses, the opening and closing of the legs being done either in the ordinary way or bymeans of the pinion H actuatedby the head J.

If it is desired to find the center line of any flat or angular body within the limits of my calipers, nothing remains to be done but to set the calipers to the thickness of the piece and to bring the scriber down to mark said piece. In this manner the center lines of any article can be instantly found and scribed, or the center of any cylindrical piecedetermined by marking said piece in two directions at right angles to each other.

The centering by means of my device is accomplished on account of the legs of the calipers being connected together by the pinion engaging the teeth of the segments, causing said legs to travel an equal distance each from the central rod or scriber, whereby, no matter how wide the legs may be opened, said rod will always remain in a position midway between the extremities of said legs.

In securing the pinion H to the tube E, I prefer to bevel the aperture in said pinion and spread the tube into said beveled part, as shown in Figs. 2 and 5. This method of fastenin g the pinion may, however, be varied Without departing from my invention as long as said pinion is fixed to the tube with capability 9 5 divider points, or into any other shape suitable for specific work; or they may be formed into the contour usually adapted for inside calipers, and they will then be found very convenient for finding the center of holes, 850.

Having thus fully described my invention, I claim as new, and desire to secure to me by Letters Patent of the United States, the following:

1. A pair of calipers, compasses, or similar instrument having two legs pivoted to a central stem carrying on its upper end a bevelpinion, said legs being provided with segments above their point of pivoting, engaging- 3. In a pair of calipers. the combination, with the legs A A, pivoted to a tube and connected together by a pinion engaging the upper extremities of said legs, of thescriber I passed through said tube, substantially as and for the object specified.

4. The improved pair of calipers hereinbe- -fore described, consisting, essentially, of the legs A A, having the circular segments 0, provided with teeth D, the central tube, E, provided with lugs G for attachment of said legs, the pinion H, fitted to and revolving on the upper end of said tube and engaging said segments, and the scriber I, substantially as and for the purpose set forth.

In testimony that 1 claim the foregoing as my invention I have hereto set my hand in the presence of two subscribing witnesses.

MANUEL WV. KAHLE,

Attest:

MICHAEL J. STARK, FRANK Hmsoizt.

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