Improvement in Lever-Powers. Page: 2 of 2
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UNITED STATES PATENT OFFICE.
MATHEW C. FRANKLIN, OF LOCKHART, TEXAS, ASSIGNOR TO HIMSELF
AND CALVIN 2M. LANE. OF SAME PLACE.
IMPROVEMENT IN LEVER-POWERS.
Specification fonning part of Letters Patent No. 219,928, dated September 23, 1879; application filed
June 27, 1879.To all whom it may concern:
Be it known that I, MATHEW C. FRANKLIN,
of Lockhart, in the county of Caldwell and
State of Texas, have invented a new and Im-
proved Lever-Power, of which the following is
a specification.
This invention relates to improvements in
the manner of applying the power and resist-
ance to the lever, so that they will change po-
sitions with relation to the fulcrum as the
power end of the lever descends.
In certain kinds of work-pressi n g cotton and
tobacco, and applying vehicle-brakes, for in-
stance-it is important to increase the lever-
age toward the end of the work; but this can-
not be done with an ordinary lever on account
of the rigid connection of the lever with the
fulcrum.
Now, my invention is designed to overcome
this objection; and it consists in attaching
the lever by two points, one on either side of
the fulcrunm, and adapting these points to
move toward the fulcrum as the lever de-
scends.
In the accompanying drawings, Figure 1 is
a longitudinal vertical section of the improved
lever, and Fig. 2 is a top plan or view of the
same.
Similar .letters of reference indicate corre-
sponding parts.
Referring to the drawings, A is the lever, hav-
ing near one end a mortise, B, made through it.
Through the mortise is passed an S-hook, C,
so as to leave its center in the mortise, where
it is secured by a transverse bolt, while the
ends of the hook are entered into recesses a b,
one on the upper side of the lever toward the
power end, while the otheris on the under side,
near the resistance end. In these recesses the
ends of the hook are secured by transverse
bolts or pins. In this way a hook is placed on
both sides of the fulcrum.
Over the upper hook, D, is placed a link, c,
carrying a roller, d, which bears against theunder edge of the hook, as shown, and to the
link is connected a hook, E. To the under
hook, D', is attached a similar lInk, e, roller
.f, and hook g. At the extremity of the power
end of the lever is a mortise, in which is piv-
oted a grooved pulley, h, for the rope of a
tackle by which the lever may be operated.
The operation of the device is as follows:
The lever is attached by the hook E to a sta-
tionary point, and hook g is connected with
tihe weight or other object to be operated up-
on. As the power end of the lever is turned
dowi the links e e move toward the dotted
vertical line a x, which coincides with the ful-
crum of the lever, into the position indicated
by the dotted lines,thus lengthening the power
end of the lever and shortening the resistance
end, thus giving greater power to the lever.
This arrangement has special value in con-
nection with vehicle-brakes, cotton and to-
bacco presses, where there is a steadily-in-
creasing resistance, and consequently it is im-
portaut to have an increased power to over-
come it.
The rollers d f on the links are designed
merely to reduce the friction of the links
against the hooks, and thus facilitate their
movement as the lever is operated.
Having thus described my invention, what I
claim as new, and desire to secure by Letters
Patent, is-
As an improvement in lever-power, the
hooks D D' on either side of the fulcrum of
the lever, the former toward the power end
and the latter toward the resistance end, in
combination with the links c e, carrying hooks
running on hooks D D', respectively, so that
as the power end of the lever descends they
approach the fulcrum and thus increase the
leverage, substantially as described.
MATIIHEW CALHOUN FRANKLIN.
Witnesses:
J. . RICE,
JNo. S. BRowNE.
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Franklin, Mathew Calhoun. Improvement in Lever-Powers., patent, September 23, 1879; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth169896/m1/2/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.