Cone Speed-pulley Belt-shifting Gear.
Year: 1894

page_text: Date of Application, 1st Mar., 1894
Complete Specification Left, 1st Dec., 1894-Accepted, 23rd Feb.,
1895
PROVISIONAL SPECIFICATION.
Cone Speed-pulley Belt-shifting Gear.
I, EGERTON SWALLOW 3 Reginald Street Rosehill Derby Engineer, do hereby
declare the nature of this invention to be as follows, viz. :-
An appliance for shifting driving belts on speed, or cone pulleys, from small
to large end, and vice-versa; it consists of a "tumbler," hung from a pivot A.,
carrying 2 specially shaped conical rollers B. B., between which the belt runs, the
opposite end is prolonged, and forms a balance weight C.
Its action, is as follows:-The pivot A, is caused to move in a line x. y. approxi-
mately parrallel to the faces of the speed-pulleys, as shown in plan, Fig. 2, so as
to lead, or follow the belt, as it moves, from one speed to another, and as close to
the pulley as convenient. For this purpose any simple mechanical arrangement
may be employed; as, a sliding-bar, a rack and pinion, a chain a screw, or a
lever.
This gear is placed in position on that side of the belt advancing towards the
pulley, as indicated by the arrows.
If it is desired to shift belt, say, from speed S₁, to S, the tumbler is moved from
point A, in direction A₂, the conical rollers now come into contact with the belt,
causing the tumbler to tilt into position b. b. c., so that the rollers take hold of the
belt, and owing to their special shape and arrrangement cause it to deflect, or
twist, so that the edge nearest S is turned outwards, from the pulley, and the other
edge inwards, as indicated at b, b, Fig. 4. in a form favourable for catching on to
speed S2, and while the belt slips into its place on S₂, the tumbler also falls back
into its vertical position, hanging free of the belt. Precisely the same action takes
place, when shifting from S, to S₁, and S, to S₁; also, vice-versa from S₁ to S₂, and
S to S,, and S, to S,.
This appliance may be used either to the driver-pulley, or to the driven-pulley,
or to both, at the same time.
Also, the rollers B. B. may be arranged to work in position on side of A.
away from pulley, as indicated at a. ẞ. B. Fig. 5, as well as shown in Fig. 1,
at A. B. B.
Dated this 27th day of February 1894.
EGERTON SWALLOW 3 Reginald Street Rosehill Derby, Engineer, does 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 :-
The above is an appliance for controlling the position of the belt on a cone-speed
pulley, and causing it to move from any one speed, to any other, from small to
large end, or vice-versa.
Referring to the drawing it consists of a "tumbler" T. hung from a pivot A,
and carrying two conical rollers R. R.

page_text: The pivot A is hung so as to move in a line . y. parallel to, or approximately
parallel to, the faces of the pulley, and as close as convenient, by means of a slide-
bar, a rack, a screw, the end of a lever-arm, or any other simple mechanical
arrangement; so that the advancing side of belt (as indicated by the arrows)
runs in centre of conical rollers, when in each successive position on faces of
pulley.
The drawing shows a slide having a light chain attached, and led round little
pulleys, so as to hang in a long loop, convenient to the hand of the man down
below.
.
The mode of action is as follows:-When it is desired to shift the belt, say from
speed S to speed S³; the pivot A, is caused to move, from position A to position A³,
and the "tumbler" T being free to swing, becomes deflected, owing to the resistance
of the belt, into the position shown by dotted lines; the conical rollers R. R. now
seize the belt, and owing to their special form and arrangement, twist it into a
form favourable for catching on to speed S³ as shown at R' R'; as soon as the
belt slips into its new place, the tumbler falls back and hangs vertically, and the
belt runs clear without touching, until the gear is again brought into action for
further changes as may be required. In the same way the belt can be shifted
from speed S³ to S2, and from S2 to S¹; also, vice-versa from S¹ down to S*-
the only difference being perhaps, that the belt slips down, more readily
than up.
The piece marked "G" is for the purpose of preventing the belt being thrown
off the top of pulley-a neat flange formed on outer edge of pulley would answer
the same purpose.
A loose pulley also may be applied to small end of cone as shown for the purpose
of stopping the machine or lathe driven by the countershaft, instead of using the
usual fast-and-loose-pulley gear, by simply throwing the belt on to it, where it (the
belt), can hang at rest, while the countershaft continues to revolve, until the gear
again sets it in motion, by drawing it (the belt), on to any required speed of the
moving cone pulley.
Another form of the "tumbler" is shown at T₁ a similar to the other, but
having the continuation T forming a balance-weight-the action of this, is precisely
the same as the other, but the relative positions of conical rollers, pivot a¹, and
cone-pulley, are reversed, i.e. the pivot a', lies on side of conical rollers x²,
remote from cone-pulley while in the other "tumbler," the pivot a lies between the
conical rollers r. r. and the cone-pulley.
Both these forms of "tumbler" may be applied to the “driven” cone-pulley, the
"driver" cone-pulley; or, to both simultaneously.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1st. The mechanical device of a "tumbler"-"T."-free to turn about a pivot "A,”
and carrying specially shaped conical rollers "R. R.," arranged as shown, the
pivot A is caused to move, as may be required; in a line x y. parallel to, or
approximately parallel to, faces of cone-pulley, so that the advancing side of belt,
may always run in centre of conical rollers, as it moves into each successive
position, on cone-pulley.
This may be applied to the "driver,” or "driven," pulley; or to both
simultaneously.
2nd. A "tumbler" with conical rollers as above, but prolonged to form a balance
weight, so as to hang in an inverted position, as shown at r¹ p² a¹ T¹.
Dated this 29th day of November 1894.
EGERTON SWALLOW..