US70143A - Improvement in pitman-head and wrist-pin - Google Patents

Description

WILLIAM N. WHI'IELY,y OF SPRINGFIELD, OHIO.

IMPROVEMENT IN PlTMAN-HEAD AND WRIST-PIN.

Specification forming part of Letters Patent N o. 70,143, dated October 22, 1867.

To all whom it may concern:

Be it known that I, WILLIAM N. WHITELY, of Springfield, in the county of Clarke and State of Ohio, have invented a new and useful l Improvement in Pitman-Heads and Wrist- Pins; and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, in which- Figure l is a plan view, and Fig. 2 a sectional view of the same.

My invention consists in an improved pitman-head and wrist-pin, by means of which connection between the pitman and crankwheel is capable of adjustment to take up lost motion as the friction al surfaces are worn away by use. j

In order that others may understand the construction and operation of my invention, I will proceed more particularly to describe it.

' W, Fig. 1, is the crank-wheel, receiving its motion from the driving mechanism of the machine; and A is the pitman or connecting rod, provided with the solid head B, through which projects the wrist-pin C. The head B has a hole drilled in the end of its neck b, and a screw-thread cut on its inner surface, into which the pitman A is irmly screwed and securely fastened by a jam-nut, J, in order to keep it from becoming loose while the machine is in operation. The head has also another hole drilled in it at right angles to the former, conical in outline, to receive the wristpin C, which is turned to a corresponding size and shape, so as to fit the cavity exactly. The larger end of the wrist-pin O is turned with a square shoulder, and has a cylindrical projection on its surface to fit Within a recess in the side of crank-wheel, as shown in Fig. l, anda hole is drilled entirely through its center, from end to end, for the clamping-bolt Gr, the head of which is at the back side of the crank-wheel W, and the screw end and nut F, at the outer or projecting end of the wrist-pin, bind the same rmlyin its seat in the side of the crankwheel. The smaller end of the wrist-pin C is also cylindrical, and has a screw-thread cut to receive the nut D and the jam-nut E, which serve to secure the head B in its place upon the wrist-pin. The nut D is made with a recess, as represented in the section at a a, Fig. 2, so that as the frictional surfaces may be worn away by use, thereby permitting the wrist-pin to project farther through the head, this loss may be compensated, the recess permitting the nut to pass up beyond the screwthread and overlap the conical portion ofthe pin, and rendering the motion of the pitman at all times regular and free from violentjerks.

This nut D is kept from becomingloose by the' motion of the machine by means of the jamnut E, which works upon the lower end of the wrist-pin O. i

This invention of mine is adapted to all machinery where motion is communicated by means of a pitman and crank, but is especially adapted to mowing machines and harvesters,

where the motion is very rapid and violent,

and the wear must necessarily be considerable. It is very easily adjusted as the wristpin may be worn, thereby keeping at all times the closest contact of the different parts consistent with the freest motion. It is not liable to get out of order, and when either head or wrist-pin becomes disabled it may be with the utmost facility replaced.

Having described myinvention, whatI claim as new, and desire to secure by Letters Patent, is-

1. The solid head B, provided with a conical box, as set forth, in combination with the tubular wrist-pin O, all constructed and operl ating as set forth.

2. The recessed nut D, in combination with the wrist-pin, as and for the purpose set forth.

WILLIAM N. WHITELY.

Witnesses Trios. J. PRINGLE, CHARLES EvANs.

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