Pitman - Coupling. Page: 2 of 3
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UNITED
STATES
PATENT OFFICE.
SAMUEL DOUGLASS, OF TEXAS, MICHIGAN.
PITMAN-CO U PLAIN G.
SPECIFICATION forming part of Letters Patent No. 600,522, dated March 15, 1898.
Application filed February 1, 1897. Serial No. 621,577. (No model)To all whom it rnay concern:
Be it known that I, SAMUEL DOUGLASS, a
citizen of the United States, residing in Texas,
in the county of Kalamazoo and State of
5 Michigan, have invented a certain new and
useful Pitman-Coupling, of which the follow-
ing is a specification.
My invention relates to improvements in
pitman connections, and more particularly
[o to improvements in pitman connections for
mowing-machines and harvesters.
The objects of my invention are, first, to pro-
vide an improved pitman connection which'
shall not bind in any position which the vari-
15 ous parts may assume from wear or other
causes; second, to provide a pitman connec-
tion in which the joints may be kept tight;
third, to provide a pitman connection in which
the joint can be perfectly tight and yet be free
20 to play from side to side to prevent binding
and unnecessary strain upon the crank or
wrist pin; fourth, to provide an improved
joint for such purposes in which the dust can
be excluded; fifth, to provide an improved
25 ball-bearing joint for such purposes, and,
sixth, to provide an improved connection be-
tween the pitman and the cutter-bar.
Further objects will appear definitely in
the detailed description.
30 I accomplish these objects of my invention
by the devices and means described in the
following specification and illustrated in the
accompanying drawings, in which-
Figure 1 is a side elevation, partly in sec-
35 tion on a line corresponding to the line 1 1
of Figs. 4 and 5, of the pitman crank-wheel
and cutter-bar of a mowing-machine. Fig.
2 is a detailed view of the connection between
the pitman and the wrist-pin. Fig. 3 is an
4o enlarged detail sectional elevation of the
same, taken on line 3 3 of Fig. 2. Fig. 4 is
an enlarged detail plan view of the connec-
tion between the pitman and the wrist-pin.
Fig. 5 is an enlarged detail sectional view on
45 line 5 5 of Fig. 1 of the connection between
the pitman and cutter-bar.
In the drawings similar letters of reference
refer to similar parts throughout the several
views, and all of the section views are taken
5o looking in the direction of the little arrows
at the ends of the section-lines.Referring to the lettered parts of the draw-
ings, A is the crank-wheel of a mowing-ma-
chine.
B is the pitman, and D is the cutter-bar. 55
A' is the wrist-pin, which is secured to the
crank-wheel A and on which there is a suit-
able flange I, that forms a cone of a ball-
bearing. On this is screwed a member A",
which has on its inner end a flange I' for a 6o
cone of a ball-bearing which comes opposite
the flange I on the wrist-pin and forms be-
tween them a suitable ball-race for the balls
F of the bearing.
The pitman-head B' is made spherical on the 65
exterior, except at the sides and the point of
attachment to the pitman. The opening in
the head is also spherical, except where it
opens at the sides and exactly fits over the
balls F and retains them in the ball-race on 70
the wrist-pin. The wrist-pin A and the mem-
ber A" have cup-shaped flanges a a', fitted
onto the exterior of the pitman-head and are
cupped to fit the same to exclude sand and
dust so far as possible. The opening through 75
the head is larger than the wrist-pin to per-
mit of a considerable play of the wrist-pin
and pitman to prevent binding. The spher-
ical opening of the head holds the joint tight.
The member A" being adjustable retains 8o
the balls tight in the bearing and so takes up
all play and lost motion no matter what po-
sition the pitman takes within the limits of
its motion. The flange a' serves as a con-
venient means to handle the member A", and 85
it is locked in position by a suitable nut.
On the cutter-bar D is an upwardly-pro-
jecting arm D', which takes the place of the
usual eye or journal at that point. This arm
is curved in the are of a true circle, the pe- 90
riphery of which is toward the end of the bar.
The connection to the bar consists of the head
C, which is recessed to extend each side of
the arm D' and contains a roller E' on a pivot
n therethrough. The roller fits the inside of 95
the arm D'. Within the head C is a block C',
adjustable therein. The outer side of the
block is recessed to correspond to the outer
surface of the arm D'. Between the block C'
and the arm D' are rollers E to reduce the ioo
friction. The head is channeled out between
block C' and arm D' to retain the rollers E in
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Douglass, Samuel. Pitman - Coupling., patent, March 15, 1898; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth510212/m1/2/: accessed June 19, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.