Improvements in Frictional Clutches.
Year: 1889

page_text: Date of Application, 14th Dec., 1889
Complete Specification Left, 12th Sept., 1890-Accepted, 15th Nov., 1890
PROVISIONAL SPECIFICATION.
Improvements in Frictional Clutches.
We, EUSTACE WIGZELL, and JOSEPH POLLIT, Engineers, of Bank Foundry,
Sowerby Bridge in the County of York do hereby declare the nature of this invention
to be as follows:-
In our improved frictional clutch a disc is keyed on to a shaft, and partly inside this
disc is another disc which is keyed on to the shaft requiring to be thrown on and off,
or the discs may be fastened in the reverse manner. In this disc we place sliding
pins having a roller at one end this roller or rollers rests on a wedged key the wedged
key tapering towards, and being attached to a loose ring on the second shaft. The
wedged key or keys are fitted through an opening or openings in the inner disc
which is keyed to the shaft and when the loose ring is drawn back or out by a lever
the wedged key or keys are pulled out and push the pins against a spring which is
recessed on the outside of the inner disc and which presses against the inside of the
flange of the outer disc.
Thus supposing one shaft to be revolving and the other shaft to be standing still by
pressing the spring on to the outer disc the friction causes the other shaft to start
without shock or jar, or the shaft can be released by the reverse motion also without
shock or jar.
Our whole clutch consists of two discs, pins with or without rollers or with rollers
alone, or with a cam or cams, tapered keys or wedges, attached to one loose ring
piece and a spring or springs and our particular improvements are the use of keys,
rollers, or cams, pins, and a spring or springs for causing friction, such friction being
obtained by pulling out a wedged key or keys, thus securing perfect balance combined
with safety & thorough protection.
Dated this 10th day of Dan 1000
EUSTACE WIGZELL.
JOSEPH POLLIT.
COMPLETE SPECIFICATION.
Improvements in Frictional Clutches.
We EUSTACE WIGZELL and JOSEPH POLLIT, Engineers, of Bank Foundry,
Sowerby Bridge, in the County of York 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 :-
In our improved frictional clutch, a disc is keyed on to a shaft, and partly inside
this disc is another disc, which is keyed on to the shaft requiring to be thrown on and
off, or the discs may be fastened in the reverse manner.
In this disc we place sliding pins, having a roller at one end; this roller or rollers,
rests on a wedged key, the wedged key tapering towards, and being attached to, a
loose ring on the second shaft. The wedged key or keys are fitted through an
opening or openings in the inner dise which is keyed to the shaft and when the loose
ring is drawn back, or out, by a lever, the wedged key or keys are pulled out and
push the pins against a spring which is recessed on the outside of the inner disc, and
which presses against the inside of the flange of the outer disc.
Thus, supposing one shaft to be revolving and the other shaft to be standing still,
by pressing the spring on to the outer disc the friction causes the other shaft to start
without shock or jar, or the shaft can be released by the reverse motion also without
shock or jar.
Our whole clutch consists of two discs, pins, with or without rollers, or with rollers

page_text: alone; tapered keys or wedges attached to one loose ring piece, and a spring or
springs; and our particular improvements are, the use of keys, rollers, pins, and a
spring or springs for cansing friction such friction being obtained by pulling out a
wedged key or keys, thus securing perfect balance combined with safety and thorough
protection.
On the drawings annexed hereto Fig. 1 is a sectional view and Fig. 2 an elevation
of our clutch. A and B. are the two discs keyed on to the shafts C. and D. the parts
lettered E. are the keys which are attached to the loose ring piece F. This loose ring
has a groove J. on its outer end so that a forked lever (for pulling out the keys which
are attached to the ring) fits over same which enables the ring to revolve round with
the shaft leaving the lever G. stationary. So that whilst the shaft C. is revolving you
can push the ring F. in with the keys E. by means of the lever G. lifting the pins or
pieces H. and so lifting the springs I against the inside of the disc B. which is
keyed to the shaft D. causing friction and thus making the two shafts C. & D. revolve
together.
To release the coupling lever G. is pulled over, this draws out the wedges E. and
the springs I push down the pieces H. following the wedges E. thus releasing the
friction from the inside of the disc B.
I. I. are the springs-these springs are recessed on the outside of the inner disc A.
as already stated, and are held at end K. by means of a wedge driven into a cone L;
by this arrangement they are prevented from slipping out of their position.
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. The improved frictional clutch substantially as described.
2. In a clutch the use of a wedge or wedges, to lift a piece or pin, or pieces nins.
against a spring or springs substantially as described.
3. In a clutch the use of a spring or springs for causing friction substantiany as
described.
4. The use of the said spring or springs for bringing the piece or pin, or pieces or
pins back when the wedge or wedges are drawn back, as described.
5. In this clutch the method of fastening the spring or springs in the inside disc
by means of a wedge fitting into a cone as described.
Dated this Ninth day of September 1890.
ALAMA 13
DUSTACE WIGZELL.
JOSEPH POLLIT.