US254490A - Pitman-connection for harvesters - Google Patents

Description

, (No Model.)

0. M. 8vfM. G. McMILLAN. PITMAN CONNECTION FOR HARVBSTERS. No. 254,490. Patented Mar. 7,1882.

W- I I a wemziw.

" UNITED STATES:

PATENT OFFICE.

OLIVER, M. MOMILLAN AND MOSES O. MCMILLAN, OF CLINTON COUNTY, OHIO.

PlTMAN-CONNECTION FOR HARVESTERS.

SPECIFICATION forming part of Letters Patent No. 254,490, dated March '7, 1882.

Application filed July 27, 1881. (No model.)

vented a new and useful Improvement in Pitman-Connections for Harvesters, which is fully, clearly, and exactly set forth in the following specification.

Our invention relates to the heads or connecting ends of the pitman-rod connecting the flywheel with the sickle of a harvester, and it applies to either end of the same.

The connecting ends of pitmen inharvesters as now constructed soon wear so as to be useless, and require to be often replaced,-sometimes as many as two or three times in a season. When loose from wear the lost motion in the eonnectin g parts ea uses knocking, and in some instances the rod is broken before the machine can be repaired.

The object of our invention is to obviate these defects byprovidingapitman-connection which is of little cost, and which allows the lost motion from wear to be easily and readily taken up, requiring no tools of any kind either to adjust it or to fitanew one upon the end ofthe rod.

The pitman-head is made of malleable iron in two parts, divided longitudinally in the middle (horizontally) through the axial line of its bearings. The two parts of the pitman-head are hinged together at their extreme ends, the larger section (into which the rod enters and is secured by a screw-thread) being cut half-way through beyond the end of the rod. The smaller one shuts down with its inner end against the shoulder of the main piece, so as to leave the entire outer part of the head smooth and free from projections. The head, when closed, is held securely by a spring-bolt. A packing for the bearing in the head consists of two light semi-cylindrical pieces, one in each half of the head, which are provided with a lug extending laterally from the middle of each side. These lugs restin aslot or notch on each side in the head, which prevents displacement of the packing and allows of each piece of packing being both reversed (end for end) and interchanged. This feature of the packing causes it to wear much longer, and the bearing to run smoother and without noise or rattling.

Figure 1' is a longitudinal section of the pitman-head and a part of the attached rod, the view being through the axial line of rod and head. Fig. 2 is a top view of the head and a part of the attached rod. Fig. 3 is the same view of Fig. 2 with the upper section, a, removed. Fig. 4 shows views of the packings.

A is the pitman-rod; a, the pitman-head, which is made of malleable iron in two parts, a and a, and accurately fitted and connected together by a ginglymus or hinge joint, 0, at the end. The opening in the headfor the wrist of the crank-wheel or pin of the sickle-head is near the hinge end, and is divided equally in each section, so that a line dividing it centrally would pass through the division-line between sections a and a. A spring-bolt, d, is incased in the main section a of the head in line therewil;h,'(c is screwed upon rod A in the usual manner,) and projects from the shoulder c. The front end of the bolt is beveled to facilitate the closing down of the hinged top section, a, which pushes the bolt back as its end 6 is closed down, allowing the bolt to spring into a hole drilled in the end 6 for the purpose, as seen in Fig. 1.. The pitman-head is entire from the neck end d to the shoulderpoint e, where it is cut down to the middle, making the two longitudinal halves from this point to the hinge end f, the head being divided through the axial line of its bearings.

The packing 9 may be of any anti-frictional material suitable for the purpose. The lug h keeps as firmly in place as if it were held in the usual manner by heads and a countersink on either side, and the cost is much less.

The bolt (1 is preferably round, and it has a thumb-catch, i, extending up into the slot f, so as to operate it. Additional packing i, (seen between the two halves of the head,as seen in the view, Fig. 1,) of rubber or leather, may be introduced when the pieces are first fitted and afterward removed as the wear allows the parts to approximate.

We claim as our improvement in pitmanconnections for harvesters 1. The self-fastening head a, having the two parts a a, hinged together at their extreme outer ends and provided with the self-fastening bolt d, substantially as shown and specified, for the purpose set forth.

2. In a pitman-rod head divided in two sections hinged together, as shown, aself-fastening bolt by which said sections are united, and a thin metallic reversible and interchangeable packing having central transverse lugsfitting 10 in slotsin the two opposite sections of the head, substantially as hereinbefore set forth.

OLIVER M. MGMILLAN. MOSES G. MGMILLAN.

Attest:

R0121. E. DOAN,

JAMES W. BRAUN.

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