Year: 1886

page_text: Date of Application, 18th June, 1886.
Complete Left, 10th Mar., 1887.
Complete Accepted, 29th Apr., 1887.
[Communicated from abroad by JAMES ELWOOD ADAMS, Carpenter, and JAMES PRICE
WARRICK, Glass Manufacturer, both of Glassboro', Gloucester County, State of
New Jersey, United States of America.]
I, ALEXANDER MELVILLE CLARK, of the firm of A. M. and Win. Clark, of
53, Chancery Lane, in the County of Middlesex, Fellow of the Institute of Patent
Agents, do hereby declare the nature of this Invention to be as follows:-
This Invention relates to mechanical movements and has for its object to provide a
device whereby great power can be exerted with comparatively small expenditure of
force the device being of compact and simple construction, positive and reliable in
operation and convenient and effective in use. The device now to be described may
be applied to operate any small machinery-such as sewing machines, churns, jig-
saws, fans, or the like in which the desideratum is to attain considerable speed and
power with a small expenditure of force.
The device comprises a large motor wheel having upon one of its faces a ring of
teeth; and an arm loose upon the wheel shaft, said arm being weighted at the end
and a pawl being pivoted in its lower end and engaging with the internal ring of
teeth and having an arm extending approximately at right angles thereto. Upon the
wheel shaft near the arm is a loose sleeve having an arm whose lower end has a
projecting pin which engages a slot in the arm of the pawl so that when a rotary
motion in the proper direction is given to the sleeve the pin on the arm moves up in
the slot in the arm of the pawl, thus throwing the pawl outward and bringing it into
engagement with the teeth on the wheel, a continuation of this motion revolving the
wheel. A motion in the opposite direction will cause the pin on the arin to descend
in the slot in the arm thus instantly moving the pawl out of contact with the wheel.
Any suitable means for imparting a rotary motion to the sleeve may be employed.
For instance, a treadle and strap may be used, the strap being attached at one end to
the treadle, and at the other end to the sleeve and wound upon the same in a direction

page_text: opposite to that in which it is desired to turn the driving wheel. After the impetus
has been given to the wheel by forcing the treadle to the extent of its downward
movement, the treadle is released and the sleeve is returned to its normal position.
This return may be effected by a spring which is coiled when the sleeve is rotated in
a direction to move the wheel and in uncoiling returns the sleeve to a proper position
to receive another impetus from the treadle, or an arrangement may be employed
consisting of a leaf spring attached to any suitable part of the frame and a strap
wound upon the sleeve in a direction opposite to that in which the strap connected
to the treadle is wound. As the one strap is unwound in driving the sleeve the other
strap is wound upon the sleeve against the force of the spring and as soon as
pressure is removed from the treadle the resiliency of the spring acting upon
the sleeve through the connecting strap will turn the sleeve back to its normal
position.
The motor-wheel is heavy and gears with a much smaller and lighter wheel so that
the momentum imparted to the said wheel is not overcome between the impulses of
the pawl but on the contrary a continuous rotary motion of the motor wheel is
produced by the operation of the device. The motion of the wheel may be converted
into any desired motion. For operating what is termed a "scroll" or "jig" saw the
main wheel may have teeth on its perimeter, and gear with a pinion provided with a
crank pin connected by a rod to the lower arm of the saw frame.
This 10th day of Lune 1886
A. M. CLARK.
By A. M. & Wm. Clark,
53, Chancery Lane, London,
Patent Agents.
COMPLETE SPECIFICATION.
A New Mechanical Movement.
1 ALEXANDER MELVILLE CLARK, of the firm of A. M. and Win. Clark of
53 Chancery Lane in the County of Middlesex, Fellow of the Institute of Patent
Agents, do hereby declare the nature of this Invention (a communication to me from
abroad by James Elwood Adams Carpenter, and James Price Warrick Glass
Manufacturer, both of Glassboro Gloucester County State of New Jersey United
States of America), and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement :-
This Invention relates to mechanical movements; and has for its object to provide
a device whereby great power can be exerted with comparatively small expenditure of
force, the device being of compact and simple construction, positive and reliable in
operation, and convenient and effective in use.
The Invention consists in the construction combination and arrangement of parts
and details, as hereinafter fully described and then pointed out particularly in the
claims.

page_text: Reference is to be had to the accompanying drawings forming a part of this
Specification, in which figure 1 is a side elevation of the device, the supporting frame
being partly broken away to disclose the disposition of operative parts, and figure 2 is
a vertical sectional view on the line x-x figure 1.
Similar letters of reference indicate corresponding parts in both the figures.
The device now to be described may be applied to operate any small machinery-such
as sewing-machines, churns, jig-saws, fans, or the like-in which the desideratum is to
attain considerable speed and power with a small expenditure of force. In the
present embodiment of the Invention it is shewn as applied to a jig-saw.
A represents the large motor wheel which has upon one of its faces a ring of teeth a.
The wheel is mounted upon a shaft a having bearings in the frame A¹. c represents
an arm mounted loosely upon the shaft a. The upper end of this arm is preferably
weighted and its lower end has a bifurcated head c¹ in which is pivoted
pawl d
having an arm d' extending approximately at right angles thereto. The pawl dis
designed to engage with the ring of teeth on the motor wheel and thus turn the
same. Upon the shaft a near the arm e is mounted loosely a sleeve B which is
provided at its end adjacent to the arm c with an arm b. The lower end of this arm
has projecting therefrom a pin which engages a slot in the arm d¹ of the pawl. Thus,
it will be seen that when a rotary motion in the proper direction is given the sleeve,
the pin on the arm b moves up in the slot in the arin of the pawl, thus throwing
the pawl outward and bringing it into engagement with the teeth on the wheel, and
that a continuation of this motion will revolve the wheel. A motion in the opposite'
direction will cause the pin on the arm to descend in the slot in the arm d¹, thus.
instantly moving the pawl out of contact with the wheel.
Any suitable means for imparting a rotary motion to the sleeve may be employed.
In the present embodiment of the Invention, a treadle E and strap b² are shewn as a
means of accomplishing this end. The treadle is mounted at its rear end in the frame,
and its front end is adapted to receive pressure from the foot. The strap is attached
at one end to the treadle, and at the other end it is attached to the sleeve and wound
upon the same in a direction opposite to that in which it is desired to turn the driving
wheel. After the impetus has been given to the wheel by forcing the treadle to the
extent of its downward movement, the treadle is released and the sleeve is returned to
its normal position. This return may be effected by a spring which is coiled when
the sleeve is rotated in a direction to move the wheel, and in uncoiling, returns the
sleeve to a proper position to receive another impetus from the treadle, or, if desired,
the arrangement shewn may be employed. This consists of a leaf spring F, attached
to any suitable part of the frame, and a strap 3 wound upon the sleeve in a
direction opposite to that in which the strap is wound. As the strap 63 is unwound
in driving the sleeve, the strap 63 is wound upon the sleeve against the force of the
spring F, and as soon as pressure is removed from the treadle, the resiliency of the
spring acting upon the sleeve through the strap 63 will turn the sleeve back to its
normal position. The wheel A is preferably comparatively heavy and gears with
a much smaller and lighter wheel, so that the momentum imparted to the said
wheel A is not overcome between the impulses of the pawl, but, on the contrary, a
continuous rotary motion of the driving wheel is produced by the operation of the
device.
The motion of the wheel may be converted into any desired motion. In the
"scroll" or
present instance, is shown its use for operating what is termed a
"jig"-saw. For this purpose, the wheel A may be toothed and gear with a pinion G
provided with a crank pin connected by a rod gy to the lower arm of the saw-frame
which is mounted in the frame A' in a suitable manner. A hollow ball H, provided
with a tube leading to the place where the saw is, operates to blow away the dust.
The hollow ball H is located between the table and the lower arm of the saw-frame in
such position that the oscillation will compress the ball to produce the necessary
current of air.
For controlling and stopping the mechanism, a brake I is provided, consisting of a
brake rod mounted to slide lengthwise in suitable guides, in the frame A¹ and

page_text: having a shoe K adapted to bear against the balance wheel L on the shaft of the
pinion G. The brake rod J has a head M at its outer end, for receiving pressure
from the knee, and between it and the frame A¹, there is a coiled spring by which the
brake shoe is normally held out of contact with the wheel L. By applying the
pressure of the knee, the mechanism can be easily stopped.
Having now particularly described and ascertained the nature of the said Invention,
and in what manner the same is to be performed, we declare that what we
claim is ;
1. The herein described mechanical movement, consisting in a main driving wheel
provided with a series of teeth, projections, or indentations, and a pawl or pawls
moving automatically into and out of contact with the teeth, projections or indentations,
as power is applied or discontinued.
2. The herein described mechanical movement, consisting in a main driving wheel
provided with an internal series of teeth, projections; or indentations, an arm or arms
loosely mounted near the wheel, a pawl or pawls pivoted to the arm or arms and
provided with a slot or slots and another arm mounted contiguous to the first, and
provided with a pin entering the slot in the pawl, substantially as described.
3. The herein described mechanical movement, consisting of a main driving wheel
and provided with a series of teeth, projections, or indentations, an arm or arms
mounted loosely upon the shaft of the wheel, provided with a pawl or pawls having a
slot, a sleeve also mounted loosely upon the shaft, provided with a driving belt, and
with an arm or arms provided with a pin entering the slot in the pawl, substantially
as described.
4. The herein described mechanical movement, consisting of the wheel A provided
with a circular ratchet, the sleeve having the operating straps wound thereon in
opposite directions, and the arms, one mounted loosely upon the main shaft and the
other fast with the sleeve, and the pivoted pawl secured to the arm which is mounted
upon the shaft, and provided with a slot entered by a pin upon the arm fast upon the
sleeve.
5. The herein described mechanical movement, consisting of a wheel A provided
with a circular ratchet the sleeve having the operating straps wound thereon in
opposite directions, one of said straps being connected with the operating treadle and
the other with the spring, and the arms, one mounted loosely upon the main shaft
and the other fast with the sleeve, and the pivoted pawl secured. to the arm which is
mounted upon the shaft, and provided with an inclined slot entered by a pin upon the
arm fast upon the sleeve.
6. In combination with the driving wheel A, the shaft on which said wheel is
mounted, the sleeve mounted loosely upon the shaft and having formed therewith the
arm & provided at its lower end with a pin, the arm e mounted loosely upon the shaft
and provided with a bifurcated lower end, and an armed pawl mounted in the
bifurcated end of the arm c, said pawl engaging with the ratchet on the wheel A, and
its arm provided with an inclined slot entered by the pin on the arm & substantially as
described.