Year: 1887

page_text: Date of Application, 16th Apr., 1887.
Complete Left, 14th May, 1887.
Complete Accepted, 14th June, 1887.
I, WILLIAM WILSON HORN of 151 Strand, Middlesex do hereby declare the nature
of this invention to be as follows:-
My invention relates to improvements in friction clutches used in connection with
pulleys which transmit motion to, or receive motion from other machinery by means
of belts or other transmitters, and is constructed in such a manner that the shaft or
shafts upon which the said pulley or pulleys run may be alternately rotated or arrested
as desired by the operator, thus enabling the said operator to stop any one or number
of machines without interrupting the motion of other machines deriving their notion
from the driving or other shaft upon the aforesaid pulley runs.
Furthermore my improved friction-clutch is constructed in such a manner that it
may be applied to any one or more pulleys without disturbing or removing the pulley
or pulleys which may have been previously upon the shafting which derives or transmits
motion to the pulley or pulleys to which my invention is to be applied.
My invention may be described as follows:-
The pulley to which my invention is applied, is not keyed to the shaft, but is
adapted to run loose upon the said shaft.
To each side of the spokes or web, forming part of the said pulley, I clamp (by means
of screws or countersunk bolts) two circular rings, the inside diameters of which are
sufficiently large to pass over the projecting edges of the boss of the pulley, and which
rings are of such thickness that they do not quite come flush with the projecting side
of the boss of the pulley.
At one side of the pulley aforementioned, is situated a circular disc of the same
diameter as the rings clamped upon the spokes or web of the pulley. The said circular
disc is provided with an outwardly projecting boss, which boss is securely keyed or
otherwise fastened to the shaft. Upon the internal face of said circular disc is securely
bolted a corresponding ring to those aforementioned.

page_text: At the opposite side of pulley, is placed a circular disc which corresponds to the
aforedescribed circular disc, being provided with a circular ring and boss, but unlike
the former disc inasmuch as it is allowed to run loose upon its shaft, and has its out-
ward face provided with grooves channeled through its diameter from its periphery to
the boss, and adapted to receive the wedging-levers, which are suitably pivoted to
projecting lugs upon the circumference of the boss of the disc.
The wedging-levers, are of two parts, and are joined together by a pin, which hinges
them at the centre. The remaining ends are provided with holes and pins, by means
of which they are pivoted to the aforesaid lugs on the boss of disc and corresponding
lugs on a movable disc also on the shaft.
The latter movable disc is provided at its periphery with a slot, which engages with
a pin on the operating hand lever.
All the aforementioned discs are constructed in halves, and provided with suitable
lugs and bolts by means of which they can be applied to the shafts without the pulley,
pulleys or shafting being removed.
The manner in which my improved friction clutch is operated is as follows:-
To clutch the loose pulley and to cause it to transmit motion to the shaft, the hand
lever, together with its grooved wheel are drawn inwards, which causes the levers to
be compressed and to push the sliding disc (upon which the levers operate) against.
the rings upon the spokes or web of the pulley, and the opposite keyed disc, in such a
manner, that the said discs clutch and transmit the motion to the shaft, or the shaft to
the pulley.
Dated this 16th day of April 1887

page_text: I, WILLIAM WILSON HORN, of the Firm of Horn & Son, Patent Agents, of 151
Strand, Middlesex, (invention communicated to me from abroad by Joseph C. Potts,
of Berwin, Pennsylvania, 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 :-
The object of this my invention is to effect the ready conversion of an ordinary belt-
pulley into a clutch-pulley, and a further object is to so construct the clutching
devices that they can be conveniently applied to the shaft and pulley without
disturbing either.
In the accompanying drawings, Figure 1 is a longitudinal section shewing the
clutching devices applied to the pulley and shaft; Figure 2, is a transverse section on
line 1, 2, of figure 1; Figure 3, is a transverse section on line 3, 4, fig. 1; Figures 4, 5
and 6, are detached perspective views on a reduced scale of different portions of the
clutch.
A, is a rotary shaft, to which power may be applied, and on which is a loose
pulley, B, having the hub a, spokes b, and rim b¹, of ordinary construction.
Clamped to the spokes b on opposite sides of same, are two friction-rings, e c', which
in the present instance are held together and to the spokes by ordinary wood screws.
These rings, which I prefer to make of wood, are divided transversely, as shewn in
fig. 2, in order that they may be easily applied to the spokes without disturbing the
wheel or shaft.
Clamped to the shaft A, at one side of the wheel B, is a split hub, D, Fig. 4, having
a flange, d, which forms a clutch-ring and carries a friction-ring, d', Fig. I, also made
in halves and secured to the flange d, by screws. This friction-ring d', when the
pulley is not clutched to the shaft, is just clear of the friction-ring c¹. In the present
instance the hub D is secured to the shaft A, by clamping set-screws e¹, passing
through ears e on the hub as shewn in Fig. 4.
On the shaft A, on the opposite side of the pulley B, from the ring d¹, is a split
hub, E, secured by set-screws passing through ears on the hub in the same manner as
the hub D. A clutch-ring, F, Figs. 3 and 5, also in two parts, held together by
bolts, is mounted on the hub E so as to be free to slide thereon, the joint between the
halves of this ring having a dovetailed portion at g, g, Fig. 3, so as to hold the two
halves of the ring together when adjusting it to its place on the collar. . The clutch-
ring F, is supplied with a friction-ring k, secured by screws in the same manner as the
ring d' is secured to the clutch-ring d.
On the inner periphery of the ring F, are two lugs h h, which are adapted to
grooves i in the hub E, Fig. 6, and which thus ensure the turning of the ring F with
the hub E, while allowing it to have an independent sliding movement toward and
from the pulley B.
Levers I (two in the present instance) are pivoted at j to lugs 7 on the hub E. One
arm m, of each lever acts as a cam, which bears against the outer face of the ring F,
and is guided by radial grooves m' therein. The other arm of each lever is connected
to a sliding collar, M, by links J, Fig. 1, the links being pivoted to the collar at n,

page_text: and to the levers at n' thus forming a double knee-joint. The collar M is grooved
at p for the reception of the usual clutch-operating lever. This sliding collar M, is
also made in two parts, which are fastened together by bolts passing through lugs q,
Fig. 1. The hubs D, and E are thus secured to the shaft, the pulley B is loose thereon,
and the sleeve M is free to slide on the shaft.
To apply the clutch, the sleeve M is moved in the direction of its arrow, Fig. 1,
forcing the cams of the lever I in the direction of their arrows.
These cams press
against the clutch-ring F and force the friction ring k against the friction-ring c of
the pulley. A continued movement of the sleeve M causes the pulley B to move
longitudinally on. the shaft, and thus bring the friction-ring c¹ of the pulley into
contact with the friction-ring d' on the clutch-ring d. The pulley is thus firmly
clamped between the two clutch-rings and caused to rotate therewith. By moving the
collar M in the opposite direction the clutch-ring F will free itself from the pulley B,
and in turn the pulley will be freed from the clutch-ring d.
The frictional surfaces may be extended to the rim of the pulley; but this will
depend on the power required. The ring F may slide on the shaft instead of on the
hub E; but I prefer the construction shown.
Other devices than screws may be used to secure the friction-rings on the pulley
and to the clutch-rings without departing from my invention, and other devices than
the levers I and links J may be used; but they are the best adapted for the purpose.
I am aware that a pulley has been provided with a ring on the inner side of the rim
for being clutched between clamping-rings, and also that a pulley or drum has had its
opposite ends provided with friction plates or discs to be clamped between a fixed and
a moveable disc on the shaft; hence I do not broadly claim such combination, my
invention having for its main object the conversion of an ordinary belt-pulley into a
clutch pulley, which is effected by applying the clutching-rings to the web or spokes
of the pulley between the hub and rim, and a further feature of the invention being
the dividing of all the clutching devices transversely, so that they can be conveniently
applied to a shaft and pulley already in position without disturbing said pulley or
shaft.
Having now particularly described and ascertained the nature of my said invention,
and in what manner the same is to be performed, I declare that what I claim is :-
1st. The combination of the pulley, having hub, spokes or web, and rim, with
clutching-rings occupying positions on opposite sides of the spokes or web of the pulley,
between the hub and rim, and confined to and carried by said spokes or web, all
substantially as specified.
2nd. The combination of the shaft and the pulley loose thereon with opposite friction-
rings, a fixed clutch-ring, and a longitudinally movable clutch-ring all of said rings
being divided transversely, whereby they can be applied to the shaft and pulley without
disturbing either of the latter, all substantially as specified.
3rd. The combination of the shaft, the loose pulley having opposite friction-rings,
the fixed clutch-ring on one side of the pulley, a moveable clutch-ring having inter-
nally projecting lugs, and a hub secured to the shaft and having longitudinal grooves
for the reception of said lugs, all substantially as specified.
4th. The combination of the grooved hub secured to the shaft, clutch-levers hung
thereto, and a movable clutch-ring having radial grooves for the reception of the
clutch-levers and internal lugs adapted to the grooves of the hub, all substantially as
specified.