US140081A - Improvement in pencil attachments for dividers - Google Patents

Description

W.l SCHULLHRN.

Fendi-Attachments for Dividers.

NO. 149,981. Patentedlunve`l7,1873.

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UNITED STATES PATENT OFFICE.

WILLIAM SGHOLLHOBN, OF NEW HAVEN, CONNEOTICUT.

IMPRVEMENT IN PENCIL ATTACHMENTS FOR DIVIDERS.

Speciication forming part of Letters Patent No. 140,081, dated June 17, 1873; application led January 29, 1873.

To all whom it may concern:

Beit known that I, WILLIAM ScEoLLIIoRN, of New Haven, in the county of New Haven and State of Connecticut, have invented a new Improvement in Compasses; and I do hereby declare the following, when taken in connection with the accompanyingdrawings and the letters of reference marked thereon, to be a full, clear, and exact description of the same, and which said drawings constitute part of this specification, and represent in Figure 1 a front view, and in Fig. 2 a sectional view of the clamping device.

This invention relates to an improvement in compasses, such as are commonly used by mechanics, the object being to make one point adjustable, as also the construction of a lead pencil attachment for the same; and it consists in a pencil-tube arranged with a bearing at or near each end to fit the leg, combined with a loop which surrounds both the leg and tube, and a set-screw through the said loop, by means of which the tube may be clamped to the leg.

A is one leg, B Bf the other leg, formed in two parts, the two parts pivoted together at a to form a hinge, both legs being jointed at the upper end in a head, C, in the usual manner, swinging to and from each other and secured by means of a segment, D, and clamp E, substantially as in the patent granted to Frank I. Plieghar and myself, and dated January 9, 1866. From the part B of one leg an arm, F, extends up, outside the part B and above the hinge, as seen in Fig. 1. Between the arm F and part B a suitable spring is arranged, here denoted in solid black as a iiat steel spring. Through the arm a set-screw, d, is

arranged, and on this a head or nut,f, by the turning of which the point may be adjustedthat is to say, turning back the nut, as denoted in broken lines, the leg will be thrown inward, and, reversing the operation, the leg will be thrown back. By this arrangement I am enabled to make a fine adjustment of the point.

It is often desirable to use a lead instead of a metal point. To do this I construct a tube, T, denoted in solid black, Fig. 2, and as seen in Fig. 1, with a seat, b, at each end to fit the leg. Around this I place a loop, L, to surround both the leg and tube, as denoted in Fig. 1; and to hold the loop and tube together a pin, l, is set through a slot, m, in the loop, as shown, and through the outside of the loop a set-screw, S, is arranged to bear upon the said tube; therefore, when adjusted to the desired position, turn the screw S, which draws th'e loop hard against one side of the leg, pressing the bearings b of the tube upon the reverse side with sufficient force to hold them in the desired position. Through the tubethe lead is arranged as shown.

When not required for use, by loosening the screw the tube may be thrown up, as denoted in broken lines,`and there secured.

I claim as my invention- A leadholder for Compasses, consisting ofy Witnesses J. H. SHUMwAY, A. J. TIEEITs.

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