Improvements in Treadle Driving Mechanisms.
Year: 1889

page_text: Date of Application, 19th Nov., 1889
Complete Specification Left, 28th Dec., 1889-Accepted, 1st Feb., 1890
PROVISIONAL SPECIFICATION.
Improvements in Treadle Driving Mechanisms.
We, JAMES ELWOOD ADAMS, Carpenter and Builder, of corner of 7th Avenue and
A Street Belmar, and GEORGE W. PATTERSON, Salesman, of corner of Main Street
and Lake Avenue Asbury Park, both in the County of Monmouth, and State of New
Jersey, United States of America, do hereby declare the nature of this invention to
be as follows: :-
This Invention relates to improvements in treadle mechanism; and it consists
essentially in the combination of a drum, bands which connect the drum respectively
with the treadle and with the framing of the machine, a driving wheel mounted on
the same shaft that carries the drum, and a lever by which motion is transmitted from
the drum to the driving wheel.
The drum is keyed to the shaft and it has two surfaces of different diameters to one of
which the band which extends to the treadle is connected while to the other is connected a
band which extends to the framing of the machine to which it is attached through the
intervention of a spring. The lever by which motion is transmitted is pivoted to a plate
on the drum and said lever is provided with a pawl or shoe which falls into teeth of
the driving wheel which is loose on the shaft. The lever is braced by a link which is
pivoted to the plate, the other end of the link being slotted to engage a stud carried
by the lever. We prefer to form the lever in sections united by a hinge joint, so that
when the shoe is thrown away from the driving wheel the lever will straighten out,
but when the pawl or shoe is applied against the face of the driving wheel the lever
sections will rock upon their hinge connections.
In operation, a reciprocating motion is imparted to the treadle. As the treadle is
forced downwards, its band is drawn upon and the drum is revolved, the other belt at
same time winding upon the drum and as the movement of the drum continues, the
pawl or shoe is brought to bear upon the peripheral face of the driving wheel and the
wheel is advanced. When the pressure upon the treadle is relaxed the spring with
which one of the bands is provided as above mentioned reverses the direction of the
drum and as the direction of the drum is so reversed the pawl or shoe is thrown from
engagement with the wheel and the belt or band of the treadle is wound upon the
drum.
Where a large driving wheel is employed, a balance wheel might be dispensed
with but otherwise we would connect a balance wheel to the driving wheel hub.
Although we have described the drum as being rigidly connected to the shaft and
the driving wheel as being loosely mounted thereon, it will of course be understood
that the wheel might be rigidly connected to the shaft and the drum loosely mounted
thereon.
By connecting the treadle belt to a drum section of greater diameter than
that to which the other belt is secured we provide for an increased leverage.
Dated this 19th day of November 1889.

page_text: COMPLETE SPECIFICATION.
Improvements in Treadle Driving Mechanisms.
We, JAMES ELWOOD ADAMS, Carpenter and Builder, of Corner of 7th Avenue
and A Street, Belmar, and GEORGE W. PATTERSON, Salesman, of Corner of Main
Street and Lake Avenue, Asbury Park, both in the County of Monmouth and State
of New Jersey, 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
and ascertained in and by the following statement:-
This Invention relates to improvements in treadle mechanism, and will be described
with reference to the accompanying drawings forming part of this specification, in
which figure 1 ista side view of our improved mechanism, shewn as applied to a jig-
saw of which the frame is represented in section. Figure 2 is a cross-sectional view
on line II-II figure 1. Figure 3 is a sectional detail view of the drum and its
connections ; and figure 4 is a side view of a portion of the mechanism, the parts
being represented as they appear when the grip is bearing upon the wheel the view
being taken in the position in which the arrow a is shewn in figure 2. Similar figures
and letters of reference indicate corresponding parts in all the views.
In the drawings 10 represents a shaft to which there is rigidly connected a
drum 11 having two bearing faces c and d. To the bearing face c there is
secured a belt or band 12 that extends to a treadle 13 while to the bearing face d
there is secured a belt or band 14 which extends to a spring 15.
To the other
end of the drum 11 we connect a plate 17 to which plate there is pivotally con-
nected a gripping arm or lever 20 which carries a shoe 21 that overlaps the
peripheral face of a driving wheel 22 that is loosely mounted on the shaft 10.
The lever 20 is braced by a link 23 which said link is pivotally connected to the
plate 17 the other end of the link being slotted as shewn at e to engage a stud f
carried by the lever.
Although not positively essential, we greatly prefer to form the lever 20 in
sections and said sections being united by a hinge joint k in a manner such
that when the shoe is thrown off from the peripheral face of the wheel as will be
presently explained, the lever will straighten out but when the shoe bites upon
the face the lever sections will rock upon their hinge connections, the parts
assuming the position in which they are shewn in figure 4 this arrangement pro-
viding for a better grip and a more advantageous leverage as will be readily
understood.
In the construction illustrated in the drawings we have represented the wheel 22 as
engaging a pinion 24 which controls a crank that is connected with the lower member
of a jig-saw, but it will of course be understood that this is a mere illustration of the
adaptation of the power.
In operation, a reciprocating motion is imparted to the treadle 13; then as the
treadle is forced downwards the belt or band 12 will be drawn upon and the drum 11
will be moved as indicated by the arrow shewn in figure 1, the belt 14 winding at this
time upon the drum and as the drum moves as indicated the grip will be brought to
bear upon the peripheral face of the wheel 22 and the wheel will be advanced in the
direction of the arrow. When the pressure upon the treadle is relaxed the spring 15
will reverse the direction of the drum and as the direction of the drum is so reversed
the grip will be thrown up from engagement with the wheel 22 and the belt or
band 12 will be wound upon its drum section.
Where a large driving wheel such as the one shewn in the drawings is employed a
balance wheel might be dispensed with, but otherwise we would connect a balance
wheel to the driving wheel hub.
Although we have described the drum 11 as being rigidly connected to the shaft and
the wheel 22 as being loosely mounted thereon it will of course be understood that the
wheel might be rigidly connected to the shaft and that the drum 11 could be loosely
mounted thereon. By connecting the driving belt 12 to a drum section of greater

page_text: diameter than that to which the belt 14 is secured, we provide for an increased leverage,
as will be readily understood.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is;
1. A treadle mechanism, substanțially as described.
2. The combination, with a shaft, of a drum rigidly connected thereto a driving
wheel loosely mounted on the shaft a grip connected to the drum and arranged to bear
on the wheel, bands connected to the drum a treadle to which one of the bands extends
and a spring to which the other band extends, substantially as described.
3. The combination, with a shaft, of a drum rigidly connected thereto a driving
wheel loosely mounted on the shaft a plate secured to the drum a lever pivotally con-
nected to the plate a link also pivotally connected to the plate and loosely connected
to the lever a shoe carried by the lever and arranged to engage the driving wheel,
bands connected to the drum a treadle to which one of the bands is connected and a
spring to which the other band extends, substantially as described.
4. The combination, with a shaft, of a drum rigidly connected thereto a driving
wheel loosely mounted on the shaft a jointed lever connected to the drum, a link also
connected to the drum and to the lever a shoe carried by the lever and arranged to
engage the driving wheel, bands connected to the drum a treadle to which one of the
bands is connected and a spring to which the other band extends, substantially as
described.
CATED
J. E. ADAMS.
G. W. PATTERSON.
By A. M. & Wm. Clark,
53, Chancery Lane, London, Patent Agents.