Improvements in Friction Clutches.
Year: 1893

page_text: Date of Application, 8th July, 1893
Complete Specification Left, 5th Apr., 1894-Accepted, 12th May, 1894
Improvements in Friction Clutches.
I, GEORGE HERBERT HODGSON of Bee Hive Works, Bradford in the County
of York, Loom Maker, do hereby declare the nature of this invention to be as
follows:-
This invention relates to improvements in friction pulleys applicable to looms for
weaving and also to other machines and for other purposes and uses.
According to this invention I employ a plate or disc the boss of which is keyed
onto the shaft to be driven. A split friction ring is bolted to the face of the plate
or disc and the periphery of this split friction ring is enclosed by a hollow boss
or shell which is free to revolve loosely on the boss of disc or plate. Two lugs are
cast to the interior of the friction ring, one on each side of the split or cut portion,
and to each of these lugs is attached by a pin or stud a short screwed rod, the ends
of both rods being connected together, and to a link, by means of a through pin.
The link is connected to one end of a short lever carried on a fulcrum stud in a
bracket fast to the plate or disc.
That end of the short lever which is connected to the link is inside the pulley,
that is between the plate and the boss, or shell and the other end of the lever
extends through a hole to the outside of the pulley and is by adjustable link and
pins or studs connected to a boss loosely mounted and free to be slided to and fro
on the shaft to be driven. A pin is fixed to this boss and one end is received in a
slot in the plate or disc so that correct relative position of the parts is maintained.
The short screwed rods, also the adjustable link and boss are, when the frictional
contact between the friction ring and hollow boss or shell is broken, at a slight
augle one with the other, and to make frictional contact the parts are brought
lineable or nearly so, as hereinafter described.
The boss is controlled by an ordinary clutch or fork arrangement and when
slided on its shaft towards the pulley the link and boss are moved to a straight line
one with the other consequently the outer end of the short lever is raised, and its
inner end depressed and by the link the two screwed rods are moved lineable, one
with the other so that their outer ends, which are connected to the lugs on the
friction ring are forced further away from one another, and the friction ring is
expanded so as to come in contact with the interior of the hollow boss or shaft
and make frictional contact therewith, and the plate or disc and its shaft will be
driven by the hollow boss or shell which is driven by belt, or strap on its periphery
as ordinary.
When applied to looms for weaving suitable apparatus for controlling the boss
and link is constructed as follows:-
An ordinary fork clips the boss and said fork being free to turn on a fulcrum
stud its free end is by link connected to one arm of a three armed lever carried on
a fulcrum stud. One of the two remaining arms has teeth formed on its end, and
these teeth gear with teeth in a sector wheel having a short arm opposite to its
teeth and this arm is connected by spiral spring with a pin at the end of the third
arm of the three armed lever which third arm is by rod connected to a hand lever,
and by a second rod and bell crank lever and bar to the ordinary stop handle of
the loom.
When the hand lever is moved in one direction the three armed lever is turned
on its stud and the teeth on the end partly turns the sector wheel so that the spiral
spring is thrown on one side of the centre of the sector and said spring holds the
parts in the position to which they have been moved until, by moving the hand

page_text: lever in a reverse direction, the sector is turned and the spring moved to the other
side of the centre and the parts are held in the second position. At the same time
that the teeth are moving the sector, one arm of the three armed lever is by link
moving the fork and boss so making or breaking frictional contact.
Dated this 7th day of July 1893
WALTER BRIERLEY,
Penny Bank Chambers, Halifax, Agent for the Applicant.
Improvements in Friction Clutches.
I, GEORGE HERBERT HODGSON of Bee Hive Works, Bradford in the County
of York, Loom Maker, 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 friction pulleys or clutches applicable
to looms for weaving, and also to other machines, and for other purposes and uses,
the object being to provide a pulley which when driven by a strap, belt or other
device and running loosely on a shaft, can by the clutch arrangement be readily
converted into a fast pulley so as to drive the shaft on which it is mounted, and this
without the necessity of transferring the driving belt, strap or other device from a
fast to a loose pulley.
Such being the nature and object of my said invention the following is a
complete description of same reference being had to the accompanying drawings in
which :-
Fig. 1 is a view of the interior of the friction clutch, the plate marked A in Fig. 2
being removed.
Fig. 2 is a sectional side elevation on line B, C of Fig. 1 and shewing also the
device for actuating the links or rods hereinafter mentioned.
Fig. 3 is a plan view of mechanism suitable for employment for controlling the
friction pulley when applied to a loom for weaving.
According to this invention I employ a plate or disc 1 the boss 2 of which is
keyed onto the shaft 3 to be driven. A split friction ring 4 is by bolts 5. 5 bolted
to the face of the plate or disc 1 and the periphery of this split friction ring 4 is
enclosed by a hollow boss or shell 6 which is free to revolve loosely on the boss 2
of the disc or plate 1. Two lugs 7. 7 are cast to the interior of the friction ring 4,
one on each side of the split or cut portion 8, and to each of these lugs 7. 7 is
attached by a pin or stud 9 a short screwed rod 10, the ends of both rods 10, 10
being connected together, and to a link 11 by means of a through pin 12ª. The
link 11 is connected to one end of a short lever 12 carried on a fulcrum stud 13 in
a hole or slot 14 in the plate or disc 1.
That end of the short lever 12 which is connected to the link 11 is inside the
pulley 6 that is between the plate 1 and the boss, or shell 6 and the other end of
the lever 12 extends through the hole 14 to the outside of the pulley and is by
adjustable link 15 and pins or studs 16 connected to a boss 17 loosely mounted
and free to be slided to and fro on the shaft 3 to be driven. A pin 18 is fixed to a
lug on this boss 17 and one end is received in a slot 18 the position of which in the
plate or disc 1 is indicated at E in Fig. 1 so that correct relative position of the
parts is maintained. The short screwed rods 10. 10 also the adjustable link 15 and
boss 17 are, when the frictional contact between the friction ring-4 and hollow boss
or shell 6 is broken, at a slight angle one with the other, and to make frictional
contact the parts are brought lineable or nearly so, as hereinafter described.
The boss 17 is controlled by an ordinary clutch or fork arrangement and when
slided on its shaft 3 towards the pulley 6 the link 15 and boss 17 are moved to a
straight or nearly straight line one with the other consequently the outer end of the

page_text: short lever 12 is raised and its inner end depressed and by the link 11 the two
screwed rods 10. 10 are moved lineable, one with the other (see Fig. 1) so that their
outer ends, which are connected to the lugs 7. 7 on the friction ring 4 are forced
further away from one another, and the friction ring 4 is expanded so as to come
in contact with the interior of the hollow boss or shell and make frictional contact
therewith, and the plate or disc 1 and its shaft 3 will be driven by the hollow boss
or shell 6 which is driven by belt, or strap or other device on its periphery as
ordinary.
The position of the hole 14 is indicated at F in Fig. 1.
When applied to looms for weaving suitable apparatus for controlling the boss 17
and link 15 is constructed as follows:-
An ordinary fork 19 clips the boss 17 and said fork 19 being free to turn on a
fulcrum stud 20 its free end is by link 21 connected to one arm 22 of a three
armed lever 23 carried on a fulcrum stud 24 in a bracket fixed to the end frame of
the loom.
One arm 25 of the two remaining arms has teeth 26 formed on its end, and these
teeth 26 gear with teeth in a sector wheel 27 having a short arm 28 opposite to its
teeth and this arm 28 is connected by spiral spring 29 with a pin 30 at the end of
the third arm 31 of the three armed lever 23 which third arm 31 is by rod 32
connected to a hand lever 33 and by a second rod 34 and bell crank lever 35 and
bar 36 to the ordinary stop handle of the loom.
The action is as follows:-
When the hand lever 33 is moved in one direction the three armed lever 23 is
turned on its stud 24 and the teeth on the end 25 partly turn the sector wheel 27
so that the spiral spring 29 is thrown on one side of the centre of the sector 27 and
said spring 29 holds the several parts in the position to which they have been
moved until by moving the hand lever 33 in a reverse direction, the sector 27 is
turned and the spring 29 moved to the other side of the centre and the parts are
held in the second position. At the same time that the teeth are moving the
sector 27 one arm 22 of the three armed lever 23 is by link 21 moving the fork 19
and boss 17 so making or breaking frictional contact.
The bar 36 extends across the whole length of the front of the loom and by
moving this bar in one direction or the other the bell crank lever 35 and rod 34 are
operated so that the frictional contact can be made, or broken either by moving the
bar 36, or the hand lever 33 or the ordinary stop handle of the loom.
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 :-
1. The general construction, arrangement and combination of parts constituting
the improved friction clutch as and for the purpose herein described and
substantially as illustrated by Figs. 1 and 2 of the accompanying drawings.
2. The plate or disc 1 having the long boss 2, the split friction ring 4, the hollow
boss or shell 6, the rods 10, 10 link 11 short lever 12 and link 15 all in combination
as and for the purpose herein described and as illustrated by Figs. 1 and 2 of the
accompanying drawings.
3. The general construction, arrangement and combination of parts constituting
the improved friction clutch together with the means of controlling same as and
for the purpose herein described and as illustrated by Figs. 1, 2 and 3 of the
annexed drawings.
Dated this 4th day of April 1894
GEORGE HERBERT HODGSON,
By his Agent, Walter Brierley,
Penny Bank Chambers, Halifax.