US179714A - Improvement in pitman-connections - Google Patents

Description

E. MQWHORTER.

. PITMAN communs. No.179,714' Patented July l11, 187e.

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UNITED STATES -ELLIS MCWHORTER, OF STERLING, ILLINOIS.

IMPROVEMENT lN PITMAN-CONNECTIONS.

Specification forming part of Letters Patent No. 179,714, dated July 11, 1876; application filed February 9, 1876. I

To all whom it may concern Be it known that I, ELLIS McWHoRTER, of Sterling, in the county of Whitesides and State ot Illinois, haveinvented certain new and useful Improvements in Pitman-Connections; and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this p 3 and 4 are detached perspective views of the parts ofthe same.

A represents the end ot' the pitman proper, which is made wedgc-shaped,as shown in Fig. 2, and provided with two longitudinal slots, a a, for the passage of the fastening and tightening-bolts. B represents the crank or wrist-pin to which the pitman is to be connected. C- is a metal bar or strap bentaround the crank-pin B, and having pitman A placed between the two arms ot' said bent bar up against the crank-pin, the extreme end of the pitman being'v made concave to fit said pin. The bar or strap C is iiexible, so that as the pitman is adjustedv to compensate for wear the bar or strap always tits the pitman the entire length of the strap closely, in which re spect this device diii'ers from all others in use by the advantages gained by the flexible strap. The parts A and C are then fastened togetier by bolts D D, which are passed through holes in the bent bar C, and through the slots a in the pitman. Nuts G G are then screwed up on the bolts D to tighten the parts firmly together. j

It will readily be seen that when thus fastened the pitman A cannot slip, on account of its wedge form. When, however, the pin or the eye, tbrmed by the bent bar U and concave end of the pin, wears so as to make more or less lost motion, it is simply necessary to loosen the bolts D, when the pitman A can be moved up against the crank-pin, and then fastened again fully as secure as before.

This device is intended to be applied at both ends of a pitman for mowers, and other similar machines, and mayalso be applied to any other pitman to take up the lost motion caused by wear.

I am aware that slides the shape of the pitman A, and capable of being moved up against thecrank-wrist, have 'been heretofore used, andI do not broadly claim the pitman A as new. But in like devices heretofore used the wear and wastein the journal or crank-wrist could be obviated but on one or, at the most, ou two sides, whilein my invention, by means ot' the combination of the iexible strap C with the pitman A, the parts heilig united closely by the two bolts, the strap G is made to inclose three sides ofthe wrist B, while the pitman A is adjusted against the fourth or remaining side, thus enwrapping the entire surface ofthe wrist B, and compensating the necessary wear around its entire circumt'er` ence by an adjustable surface, inclosing and in contact with such entire circumference.

Having thus fully described my invention, what l claim as new, and desire to secure by Letters Patent, is

The wedge-shaped pitman A, having concave end,.and provided with the elongated slots a a, in combination with the flexible bent bar or eye C, bolts D, and nuts Gr, substantially as and for the purposes herein set forth.

In testimony' that I claim the tbregoing as my own, I aix my signature in presence of two Witnesses.

ELLIS McwHoETEE.

Witnesses:

J. E. MGPHEERAN, El. C. WARD.

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