Improvements in Treadle Power Sawing Machines.
Year: 1898

page_text: Date of Application, 16th Mar.. 1898-Accepted, 6th Aug.,
1898
COMPLETE SPECIFICATION.
Improvements in Treadle Power Sawing Machines.
٠٦
I, WILLIAM HARGROVE, of 193, East Washington Street, Chicago, County of
Cook, State of Illinois, United States of America, Machinist, 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, refer-
ence being had to the accompanying drawings:-
Figure 1, is a front elevation of a band and scroll sawing machine provided with
my improved treadle power;
Figure 2, is an end elevation of the same, showing frame work a, a and gear
wheel r;
Figure 3, represents a plan view of the pawls and ratchet mechanism as shown
at the lower left-hand of Figure 1;
Figure 4, represents a rear elevation of the band saw wheel adjusting device;
Figure 5, represents the rack and pinion at the lower left-hand as shown in
Figure 1;
Figure 6, and is the one on the right hand as shown in the same figure, but
separated from each other so as to show the movements of each;
Figure 7, is a horizontal section, on the line 7-7 of Figure 1, which shows a
horizontal view of framework, shafts and treadle;
Figure 8, shows a chain of multiplying gear driven by treadle m from shaft R
to wheel r, which drives band saw wheel and jig saw pitman U from the line 8
to 8%.
This invention relates to motors or treadle powers, and is especially designed
to drive a band and scroll saw. The object of the invention is to provide a treadle
power which will not have a dead center and which will drive the machine on the
ascent of the treadle as well as on the descent.
In the drawings, A represents the table of the sawing machine, provided_with
B is the band saw, C and D arc
suitable mountings for a band saw and a jig saw.
the band saw wheels, E is a guide mechanism for adjusting band saw wheel D,
F is a grooved wheel or roller, which is adjustable on a sliding shaft and forms a
guide for band saw B. A¹ is the arm that carries band saw wheel D and jig saw G,
and a, a is the frame that supports the mountings.
The jig saw is driven from shaft c, bevel wheel T, pinion w, shaft k¹, pitman U¹,
pitman or connecting rod g, sliding head G" to jig saw G, connected with a sliding
rod is a groove and feather key in sliding rod to keep said rod from
turning. G is the frame the rod moves through. H¹, H is a thumb screw and
coiled spring to give tension to jig saw G, substantially as described. K¹ is the
shaft that drives jig saw G. and K is the frame that shaft and pitman wheel are
mounted on, as described. M is a steel treadle that has an arm 11 secured to its
rear end by a movable keeper M¹ which is secured to treadle M by a set screw
The depend-
and is pivotted to an arm Mill extending out from the frame work a.
ing arm M is secured to the arm M by a holt m" which passes through a slot m¹
in the arm M, N, N¹ are two vertical racks, each secured to the treadle M by
adjustable keepers, n, n, and are held in position by set screws. 01, 0¹ are two

page_text: coiled springs to which the upper ends of racks N, N¹, respectively, are secured.
As shown in Figure 2, the upper ends of springs (1, 0¹ are each secured to an
eyebolt, threaded through a hand nut () supported on the top of an enclosed
support o, which supports o are mounted on a bracket (%, which extends out from
frame work a, leaving supports o, o below the top of table A, thereby clearing the
table of all interferences, substantially as described. By means of movable
keepers n, n the racks N, N¹ can be secured to the treadle M in proper position
by set screws. The length of leverage of the treadle M can be adjusted by moving
the bolt m in slot m¹ in the arm M and by moving the arm M on the treadle M,
the keepers n being moved to keep the racks N, N1 in proper position.
P, P¹ are two wheels which are loosely mounted on a shaft R
and which are engaged by the racks N, N', respectively, and racks N, N
being of opposite sides of the shaft R. Each wheel P, P is provided
with one or more pawls, p, which engage with a ratchet wheel P secured on
the shaft R near each wheel P, P', so that when the treadle M is pressed
downward the rack and wheel P will drive its pawls p and ratchet wheel P
forward, and when the treadle and racks N, N₁ are raised by the springs 01, 01
the rack N and wheel P thereby continually driving the shaft R in one direction.
The tension of the springs 01, 0¹ may be adjusted by the nuts () as may be desired
or necessary to raise the racks and drive the shaft R. Q, Q are two wheels or
rollers which keep the racks N, N¹, respectively, in engagement with their respective
wheels P, P', as shown in Figure 1. On the inner end of shaft R is a gear
wheel ", which meshes with a gear wheel S on a stud shaft s, which meshes with
a gear wheel S¹ on shaft c.
U is a bevel gear mounted on shaft c. u is a bevel pinion which meshes in
wheel U and drives shaft K¹. u¹ is a slot in pinion u, throwing jig saw shaft in
and out of gear.
The shaft R, which is driven by the treadle M, racks N, N¹ and wheels P, P¹,
pawls p and ratchet P, drives the gearing for the saws, as above described, so that
the operator may use either the band saw or jig saw G. V is the fly wheel, a, a
is the frame proper.
s is a stud shaft mounted with pinion wheel S. a is an
arched frame which is mounted by a band saw wheel C connecting with frame
proper a, a. O is the frame the racks move through, and M is a guide secured
to frame to keep treadle M in proper position. The upper band wheel may be
vertically adjusted by means of the screw e, and it may also be adjusted in the
direction of its axis by means of the screw e³, and clamped after adjustment by
the bolt The screw c¹ serves to adjust the said band wheel around a vertical
axis to bring it into proper relation to the lower band wheel. The saws are driven
by the same force on the upward movement as on the downward movement of the
treadle M. There is no dead center and no lost motion in this improved treadle
power or motor, which can be readily applied to any machine which it is desired
to drive by foot or treadle power.
Having now particularly described and ascertained the nature of my said in-
vention, and in what manner the same is to be performed, I declare that what I
claim is:
1. In a machine of the character described, the combination, with the frame and
its table, of the treadle, the racks connected thereto, the driving shaft operatively
connected with the racks, springs connected to the upper ends of the racks, and
a bracket attached to the frame below the table and carrying below said table the
adjusting supports for the springs, substantially as set forth.
2. In a machine of the character described, the combination, with the frame,
the driving shaft, and the spring-controlled racks operatively connected therewith,
of treadle connected with said racks and to the frame by a link at its rear end,
and a guide secured to the frame and embracing the front portion of the treadle,
substantially as set forth.

page_text: 3. In a machine of the character described, the combination, with the treadle,
the spring-controlled racks connected thereto, the driving shaft having loose
pinions with pawls and fast ratchet wheels, the band wheel shaft connected there-
with by suitable gearing, a bevel gear on said band wheel shaft, and a shaft
provided with a pitman wheel and pitman to drive a jig saw and having an
adjustable bevel pinion to engage said bevel gear, substantially as set forth.
Dated the 3rd day of March, 1898.
WILLIAM HARGROVE.