US247879A - Pitman - Google Patents

Description

U'rnrrm)l STAT-Es PATENT Carica.

ISAAC G. BOWER, OF FREMN'I, OHIO.

PITMAN.

SPECIFICATION forming part of Letters Patent No. 247,879, dated October 4, 1881.

` Application tiled April 9, 1881. (No model.)

To all whom t may concern v Be it known that l, ISAAC G. BOWER, a citizen ofthe United States, residing at Fremont, in the county of Sandusky and State of Ohio, have invented certain new and useful Improvements in Pitman; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as 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 letters or igures of reference marked thereon, which forln a part of this specification.

The object of the present invention is to provide a pitman and devices for connecting the" same with the wrist or crank pin and knifehead of a reaping-machine, or with any other class of machinery, which will enable the platform of the reaper to be raised and lowered and the guards to be tilted without causing' the pitlnan to bind on the crank or wrist pin of the driving mechanism.

It has heretofore been proposed to connect a pitman with a knife or cutter bar by. means of a hinge-joint and with a' wrist or crank pin by means of a globular o r balljoint; but such a form of connection has not proved satisfactory by reason of the defective construction of the devices employed.

'.Ihe aim of the present invention is to provide a pitman of a simplified construction, and strong and effective devices for connecting the same with the knife-head and wrist or crank pin of the driving mechanism, so that the pitman is free to turn vertically and axially for preventing the strain or breakage thereof, aud removing all liability of its binding on the crank-pin. These results I attain by the construction and combination-of parts hereinafter described and claimed. Y

In the drawings, Figure lis a side elevation of a pitman and means for connecting the same with the knife-head and crank-pin. Fig.v 2 is a transverse section taken through the knifeheadjoint of the pitman. Fig. 3 is a sectional view of the globular or ball joint held in a chambered sectional head of the pitman, and receiving the crank-pin. Fig. 4 is a detail view of one of theseetions of the ball-joint having facerilos and an oil-conducting groove. Fig. 5 is a detailview of one of the sections of the chambered. head which receives the ball-joint, and

tends a projection, C, approximatingr in shape l a frustum ot' a cone. Said projection has a central opening, D, which also extends through the head A. The Haring recess B receives the colle-shaped projection E ot' a head, F, carried by the pitinamand said projection-is provided 4with a recess, El, ofthe saine shape the projection C.

An opening I, is made through the center of the projection E and through the head F, and a bolt, J, passed through the openings D I is secured by a nut, K, fitted on the screwthreaded end of the bolt. A countersink orv recess, a, made in thc head F, receives said nut.A The cone-shaped projections and recesses on the knife and pit-man heads constitute double bearing-surfaces, th'e bolt J being simply the medium for connectingthe two heads. The A screw threaded portion of said bolt engages with the internal thread made in the'opening D of the projection C, and the smooth portion of the bolt extending beyond said projection and passing through the head F of the pitman is made somewhat smaller in diameter than the opening through which it passes.

The object ot' this construction is to prevent the pitman-headfrom wearing the bolt 4and to decrease friction as much as possible by simply resorting tothe conical projections and recesses as beariugsurfaces. The boltv furthermore serves as a means for tightening;r the joint as the bearing-surfaces wear off. In addition to the internal bearing-surfaces I provide the head F with an external'lug or projection, L,

which has a concave surface fitting against y the circular portion of the head A. In this 4manner I obtain a bearing-surface especially designed to resist all longitudinal strain to which the pitman may be subjected.

The pitman rod M has end screwthreads, which are ot such length that said rod can be adjusted in screw-threaded sockets of the pitman-heads F and N. Jam or locking nuts a retain the rod in position after it has been properly adjusted. The head N, carried by the pitman, has an enlargement atitsinner end, which is made with a hemisph'erical or semi-globular chamber or recess, 0, and projecting flanges?.

A cap piece, Q, having a chamber ot the same shape as the head N, is provided with langes R, which fit against the flanges l?, and screw-bolts S, passed throughboth sets of anges, serve to secure the cap Q to the head N.

It will he manifest that the head and cap form an internal chamber of a globular form. This chamber contains ajournal, T, of aglobular form, which is made of two parts or sections, having their contiguous faces provided with interlocking ribs t and with a central semi-cylindrical channel, u. These channels, when the two sections are litted together, form a cylindrical bore or opening forthe reception ofthe crank or wrist pin of the driving-wheel or othermechanism. The globular-shapedjournal is left free to rotate within the chambered head N, and cap Q, or, mare properly, the pitman can turn on said bearing without straining or disturbing the crank or wrist pin.

In order to prevent the complete rotation of the globular-shaped journal within its holding box or head, I provide one of the sections of the journal T with an externally-located conical recess, U, into which enters a conical or tapering pin, V, projecting from the base of the chamber in the cap Q or in the head N. The crank-pin (not shown) passes through the apertured sides of the head N and its cap Q, and through the bore or opening of the globular journal T.

The pitman can articulate or turn on the knife-head bearing in a vertical direction, so as to permit a harvester-platform and its adjuncts to rise and fall, and a similar vertical movement combined with an additional axial or rotary movement of the pitman can freely take place by reason of the globular journal T, fitted into the pitman-head and embracing the crank-pin. As has already been stated, the movement ot' said globular journal is limited or defined by means ofthe conical pin and recess, which are of such a size and shape that the free movement ofthe globular journal is notimpeded.

In order to permit the crank-pin hearing to be properly lubricated, I provide the head Q, or the llanges thereof', with vertical grooves W, which serve to convey7 oil admitted into the same to the globular journal, having oil-conducting channels X on the adjoining faces of the sections composing the 4same.

Havingthus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. The combination of the pitman-head N and end cap, Q, havin ga globular chamber, and projection V, with the bisected globulnrjourv nal T, having a crank-pin opening, and a tapering cavity, U, as and for the purpose set forth.

2. The bisected globular journal T, having interlocking ribs t, and oil-channel X, in combination with the pitman-head, having a globular chamber, and oil-channel W, as and i'or the purpose set forth.

In testimony whereofl affix my signature in presence ot' two witnesses.

ISAAC G. BOWER.

Witnesses:

I. C. OBRiEN, G. E. Boor.

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