Improvements in Devices for Converting Reciprocating into Rotary Motion.
Year: 1893

page_text: COMPLETE SPECIFICATION.
Improvements in Devices for Converting Reciprocating into Rotary
Motion.
We, FRANCIS JACKSON, Farmer, of Raisonville, Monroe County, Michigan,
and FRANKLIN ATKINSON, Farmer, and WILLIS BALDWIN, Lawyer, both of
Monroe, Monroe County, Michigan, all of the United States of America, do
hereby declare the nature of this invention and in what manner the same is to
be performed, to be particularly described in and by the following statement :—
This invention consists in the peculiar construction, arrangement and combination
of the various parts.
In the drawings,
Fig. 1 is an elevation of our improved device showing it applied in connection
with a treadle or foot power as used on a sewing machine.
Figs. 2 and 3 are diagram elevations of the levers, and movable fulcrum frames,
showing the parts in different positions.
Fig. 4 is a central section on line - Fig. 5, showing the parts in a still
different position.
Fig. 5 is an enlarged elevation.
A is a portion of the frame of a machine upon which our device is supported.
B is a double crank shaft journalled in the frame and C is the drive wheel on
said shaft for transmitting power from the device to the machine to be driven.
D, D' are two frames pivoted upon the pivot pins E at opposite sides of the
cranks, as plainly shown in Fig. 4. From these frames at opposite sides of the
cranks.are arranged the pins a, b, the pins a being provided with heads c.
F and F¹ are two levers, each provided upon a crank and in this construction we
have shown them extended from opposite sides of the machine.
G, G' are bell crank levers journalled in stationary bearings on the frame and
pivotally engaging the ends of the levers F and F.
H and Hare connecting rods connected at their lower ends to the treadle I,
which has a pivot J slidingly secured in a slot J¹ in the bracket .J' upon the
floor.
The levers F and F are provided near their center with the substantially heart
shape enlargements K. At one end of these heart shaped enlargements are the
cam grooves L, which pass through the levers and beneath the upward extending
flange or lips M. We preferably employ a spring N at the opposite side of the
cam groove, but this may be dispensed with.
The parts being as shown and described, the operator placing his foot upon the
treadle I, presses down the outer end thereof, which through the connecting rod H
will rock the bell crank G which will actuate the lever F and turn the crank.
Through the connecting rod H' and the bell crank G', the lever F will be corre
spondingly moved. These levers extend on both sides of the cranks as shown, and
the outer ends are provided with a forked bearing O. As the lever F is brought
into parallelism with the long arm of the bell crank G the bearing O on the end
of the lever will engage with the fulcrum b on its frame. Each fulcrum will be
rocked into the path of said lever by the bearing of the head of the pin a upon
heart shaped enlargement K of the lever. As the arm G continues its oscillating
movement from the point of parallelism downward, the bearing O will be disengaged
from its fulcrum pin and as the lever continues its movement, the pin a will engage
beneath the lip
M of the cam guide way L rocking the frame D, so that the lever
is fulcrumed thereon and actuates the crank therethrough; the bell crank Gand
its lever F¹ will be passing through the same movement as described for the lever F
the

page_text: and when the operator presses upon the other end of the treadle, the mechanism
will be actuated through said last named levers in the manner described.
Where we use the two levers, as herein described the fulcrums on each side of
the cranks, on both frames are moved in and out simultaneously. This will be
understood by a reference to Fig. 4 where both fulcrums on the right hand of the
cranks are shown in engagement with the levers, while the fulcrums on the opposite
side are both out of engagement.
In Fig. 3 we have shown the parts with one of the cranks on the dead center
and the other, it will be seen, is in position for operation. With this device we
gear up from the treadle movement so as to get a complete revolution from the
downward movement of each connecting rod, and we distribute the application of
the power evenly, or at four points around the wheel instead of at one point as in
the ordinary crank action.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is :
1. In a device for converting a reciprocating into a rotary motion, the combina-
tion of a crank, a lever pivoted thereon, means for oscillating the lever and
fulcrums on opposite sides of the crank alternately projected into the path of the
lever, actuated by the lever, substantially as described.
2. In a device for converting a reciprocating into a rotary motion, the combina-
tion of a shaft, a double crank thereon, a lever pivoted on each crank, means for
oscillating the lever, frames pivoted beside the cranks carrying pins on opposite
sides of the cranks, and means for alternately moving the fulcrums on opposite
sides of the crank into the path of the levers, substantially as described.
Deted this 2nd day of Anril 1893
FRANCIS JACKSON.
FRANKLIN ATKINSON.
WILLIS BALDWIN.
Haseltine, Lake & Co.,
45, Southampton Buildings, London, Agents for the Applicants.