US427536A - Pitman-holder for mowing and reaping machines - Google Patents

Description

2'Sheets-Sheet 1.

(No Model.)

v G. H. BARTLETT. PITMAN HOLDER FOR MOWING 0R BEAPINGMAGHINES.

No. 427,536. Patented May 13, 1890.

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(No Model.)

I 2 Sheets-Shee't 2. G. H. BARTLETT.

PITMANHOLDER FOR MOWING 0R REAPING MACHINES. No. 427.536.-

Patented May 13, 189.0.

ZaATmRNEi p UNITED STATES PATENT OFFICE.

GEORGE HERMAN BARTLETT, OF IIOOSIUK FALLS, NEYV YORK.

PlTMAN-HOLDER FOR MOWING AND REAPING MACHINES.

SPECIFICATION forming part of Letters Patent No, 427,536, dated May 13, 1890. Application filed November 23, 1889. Serial No. 331,275. (No model.)

To all whom it may concern.-

Be it known that I, GEORGE HERMAN BART- LET'I, a citizen of the United States, residing at Hoosick Falls, Rensselaer county, New York, have invented certain new and useful Improvements in Pitman-Holders, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this speciiication.

This invention relates to pitman guides or holders, which are adapted to hold the pitman in the scythe-eye, and also to permit, by raising the latch of the holder or guide, the removal or insertion of the pitman; and it consists, more particularly, in a novel catch tolock the latch when lowered in place irrespective of the action of the spring by which the catch is operated. The catch is provided with a cam operated on by a cam on the latch,

. which, when pushed downwardly, serves to move the catch to lock the latch. A spring is applied to the catch to hold the latch locked, and a downward pressure on the catch, owing to its cam shape in conjunction with the cam shape of the latch, brings about the initial displacement of the latch from the catch;

In order that others skilled in the art to which my invention relates may the more readily understand the same, I will now proceed to describe it with reference to the accompanying drawings, in which similar letters of reference indicate like parts, and in which- Figure 1 is a perspective view of my improved pitman holder and guide. Fig. 2 is a perspective View of the catch. Fig. 3 is a perspective view of the latch, looking from the points of the guards. Fig. 4C is a top plan view showing a portion of the finger-bar, knife, pitman, and shoe.

G is the finger-bar, to which the guards g are bolted.

P is the pitman connected to the knife H in the knife-head S.

P is the shoe.

A is the main portion of the guide or holder, and is perforated at Ct to to receive bolts by which it is secured rigidly to the finger-bar.

B is a catch perforated at b to receive a pivot-pin bflfastened between the lugs a a on the portion A. The catch is provided with a lug 1), between which and the portion A is interposed a spiral spring A; The spiral spring tends to hold the catch in the position shown in Fig. 1. The catch is provided with a lug b the top of which is curved or camshaped at 11 and the under side of which is adapted to fit over the adjacent end of the latch C at c. The catch B is curved or camshaped at b, and the inner end of the latch O is curved or cam-shaped at c. The latch is pivoted at 0 between ears 0 0 attached to the portion Aof the holder, and is adapted to be raised or swung up on its pivot a suflicient distance to permit the insertion or removal of the pitman.

The operation of the invention is as follows: hen the pitman has been inserted in the scythe-eye, which reciprocates in the usual well-known way just in front of the latch C,

' the latter is swung downwardly on its pivot,

and the curved surface 0', coming in contact with the curvedv surface b of the catch, the latter is moved backwardly on its pivot, compressing the spiral spring A. The latch having passed the lug b the cam or curved surface c, coming in contact with the cam 1), acts to swing the catch in the opposite direction in conjunction with the force of expansion of the spring A, and the under side of the lug b fitting over the portion 0 of the latch O the latter is held in place. To disengage the pitman, the operator presses down upon the spring-catch on the inner end thereof, and the cam-face 11 by the movement of the catch bearing upon the cam-face c, raises the latch from engagement with the spring-catch, when the latch is further swung up on its pivot by the operator a sufficient distance to permit the removal of the pitman from the scythe-eye.

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

1. In a pitman guide or holder, the combination, with a swinging latch formed on its free end with a cam-face, of a catch formed with two cam-faces successively engaged by the cam-face of the latch to move the catch backwardly and then forwardly, substantially as and for the purpose specified.

2. The combination, in a pitman guide or holder, of a swinging latch having a cam-face 011 its free end, a catch having a cam-face thereon engaged by the cam on the latch to move the catch forwardly in conjunction with 10 swing the catch, substantially as and for the the spring to lock the latch in place, substanp p pecified. tially as and for the purpose specified.

3. In a pitman guide or holder, the combi- In Witness whereof I have hereunto set my nation of a swinging latch having a cam-face hand this 20th day of November, 1889. on the free end thereof, a catch having two GEORGE HERMAN BARTLETT. cam-faces thereon engaged by the cam-face Witnesses: on the latch tofirst move the catch back- H. P. BLACKINTON, ward] y, compressing the spring, and then I D. PEMKLE.

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