Improvements in or relating to Friction-clutch Pulleys.
Year: 1888

page_text: Date of Application, 6th Oct, 1889
Specification Accepted, 8th June. 1899
COMPLETE SPECIFICATION.
Improvements in or relating to Friction-clutch Pulleys.
A communication from abroad by ANDERS PETER KJOLLER, of Holyoke, County of
Hampden, State of Massachusetts, United States of America, Mechanical
Engineer.
I, WILLIAM PHILLIPS THOMPSON, F.U.S., M.I.M.E., of the Agency for Foreign
l'atent Solicitors, 6. Lord Street. Liverpool, and 6, Bank Street, Manchester, both in
the County of Lancaster, and 323, High Holborn, in the County of Middlesex, Civil
Engineer 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 friction-clutch pulleys, and pertains to that class thereof
having within the driving-pulley friction-segments capable of engagement with the
interior of said pulley; and the invention consists in the peculiar construction and
arrangement of the various parts of the device, all as hereinafter fully describod,
and pointed out in the claims.
In the drawings forming part of this specification :-
Figure 1 is an elevation of the open side of the driving-pulley having applied
thereto friction clutch devices embodying these improvements, said Figure showing
the central shaft and an inclosing sleeve in section, and a collar on said sleeve, partly
broken away.
Figure 2 is a side elevation showing a portion of the central shaft, the driving-
pulley, and the friction-segments in vertical section, and the devices on one side of
the shaft, which operates said segments, said sectional indications of this Figure being
about on line x, x, Figure 1.
Figure 3 is a sectional view on line y, y, Figure 1.
Figure 4 is a plan view of the inner face of one of the friction-segments and of the ends
if bonus consented therate

page_text: Figure 5 is a sectional view of said segment, Figure 4, on the line z, z.
Figure 6 is a side elevation of one end of a sleeve forming part of said friction-
clutch device, as hereinafter fully described.
Figure 7 is a detail view of a modification in construction to be hereinafter
referred to.
In the drawings:
B indicates a shaft on which said friction-clutch pulley is mounted and which is
rotated thereby.
A is the driving pulley, having a hollow hub c, through which said shaft B
passes, and which constitutes a pulley-bearing, said pulley running loosely on said
shaft and being open on one side, as shown, to receive the frictionally-engaging
segments below described.
A sleeve 2, having a head 6, of cylindrical form, and having projecting laterally on
the opposite sides thereof two arms 5, is secured on shaft B by a key 4, and the head
thereof incloses the said hub c, of the pulley A, as shown in Figure 3. A collar 3, is
fitted to slide on the smaller end of said sleeve 2, and has in its periphery an annular
groove 16, to receive the bifurcated end of a suitable shipper-lever, whereby said collar
is given said sliding motion on sleeve 2.
Two segments 7, are fitted into the driving-pulley A on opposite sides of the shaft B,
said segments being capable of frictional engagement with the interior of said driving-
pulley A, and of being disengaged therefrom by means of the following mechanism.
Each of said segments is provided with a recess, d, extending at right angles to the
shaft B, which recesses receive the arms 5 on the head of the sleeve 2, whereby
the rotating force which is imparted to said segments by reason of the frictional
engagement of the latter with the pulley A is imparted to said sleeve, and through the
latter to the shaft B, to which said sleeve is keyed. The said segments are given each
a movement outwardly from the shaft B, so that their peripheries are brought into
frictional engagement with the interior of the driving-pulley A by means of two
cams 8, attached to each segment, as shown clearly in Figures 1, 2, 4 and 5, and
two intermediate cams 9, the ends of which engage with the ends of said cams 8,
and receive within them the studs e, on the outer ends of said cams 8, said studs e, con-
stituting the bearings or journals on which said intermediate cams have a reciprocating
rotary motion. Each of said intermediate cams 9, has a bifurcated arm 10, in which
are slots vv, slightly curved, as shown in Figure 3, and on the rear side of the
cylindrical portion of said intermediate cam is a groove o, extending partly around said
cylindrical portion. The said grooves o in the intermediate cams 9, engage with a short
stud, (see Figure 3), whereby said intermediate cams are prevented from end wise
motion when operated. Each of said arms 10 of the intermediate cams 9, is provided
with an auxiliary arm or lever 12, the inner end of which bears against the cylindrical
portion of said cam between the parts of its bifurcated arm 10, and said lever 12.is
adjustably connected with the bifurcated arm 10 by a bolt 13; (see Figure 2) which
passes through the aforesaid curved slots v, and said lever, whereby means are provided
for changing the position of the end of said lever relative to the adjoining side of the
sleeve 2, so that, should the faces of the said cams 8 and 9, become worn, and thereby
the requisite lateral movement of the segments 7 be interfered with, the ends of the
levers 12 may be adjusted toward the sleeve 2 in order to increase their swinging
motion when connected to the operating devices below described.
In lieu of the above-described construction for adjustment, the intermediate cam 9,
may have a stud 20, screwing through the outer end of its arm 10, provided at its
head with a pivotal cross-pin 22, on which one end of the link 14 is attached. the
adjustment being secured by disconnecting the end of the link from the screw stud. 20,
and then turning the said stud either in or out as required, and then re-connecting
the link thereto, all as will be plain on reference to the detail view, Figure 7, and
again; if preferred, the intermediate cams 9, may be constructed each with a rigid arm
thereon, substantially like said arm 12, and not possessing the means of adjustinent
above-described to take up for the wear.of said cams.

page_text: On the smaller end of sleeve 2, as aforesaid, is placed said annularly-grooved
collar 3, to the inner side of which are pivotally connected two links 14, (see Figures 2
and 3), said links having a pivotal connection with the ends of the aforesaid levers 12
on the intermediate cams 9. Each of said segments 7 is provided with two hooks or
other similar devices (see Figure 1) which provide means for connecting two retracting
springs 15, between said segments, whereby they are drawn together or toward each
other, when free to do so, by the proper operation of said intermediate cams 9.
The operation of the above described improvements is as follows: The driving-
pulley A is actuated by any suitable belt applied thereto, whereby it is given a con-
tinuous rotary motion, which motion it may be desirable to impart continuously or
intermittently to the shaft B, the latter being either what is ordinarily termed a
driving" or a "counter" shaft, said pulley, as aforesaid, when not engaged by the
segments of the friction-clutch devices, rotating freely on said shaft. The aforesaid
shipper-lever with which the grooved collar 3 is adapted to engage ordinarily is
suspended in a pending position under the shaft B, having one end engaging with the
annular groove 16 in said collar, whereby, when the shipper-lever is swung, said
collar is given a longitudinally-sliding movement on the sleeve 2. The position of the
parts in Figure 3 is that which they occupy when the friction-segments 7 occupy
a position nearest to shaft B, and consequently they are not in engagement with the
interior of said driving-pulley; but when by the operation of said shipper lever, the
collar 3 is moved toward the pulley A, the cams 9 between the cams 8 on the said
friction-segments are given more or less of a rotary motion by reason of their above
described connection with said collar 3, and the said rotary motion of the cams 9
causes a simultaneous lateral movement of the two segments in opposite directions,
against the inner side of the pulley A, with which said cams thereby become frictionally
engaged, so that said segments, the sleeve 2, with whose arms 5 they engage, and the
shaft B, to which said sleeve is keyed, are given a rotary motion corresponding to
that of the pulley A, so long as said collar 3 is held in a certain position on sleeve 2.
To stop the rotary motion of the shaft B, said collar 3 is moved in a direction away
from the driving-pulley A, thereby permitting said friction-segments to be withdrawn
from their contact with the inner side of said driving pulley by the action of the
retracting-springs 15.
The above-described friction-clutch pulley embodies a construction which is com-
paratively simple, and such a combination of levers and cains between the collar 3 and
the friction-segments 7 as enables the operator to bring said segments into operative
relation to the driving-pulley by the expenditure of a very slight force, to actuate
said collar, and the connection, consisting of the sleeve 2, having the arms 5 thereon,
between the friction-segments and the shaft to be driven, is an essentially strong and
durable one.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, as communicated to me
by my foreign correspondent, I declare that what I claim is :-
1. A friction-clutch consisting of a cylindrical sleeve having laterally extending
arms 5, two friction-segments engaging with said arms and capable of lateral movements
thereon, two cams S, oppositely secured to each of said segments, two intermediate
cams 9, engaging with said cams 8, each having a laterally-extending arm, a collar 3,
capable of a longitudinal motion on said sleeve, and links 14, pivotally connected
between said collar and the arms on said cams 9, a driving-pulley A, inclosing
said segments, and retracting-springs between the latter, substantially as set forth.
2. A friction-clutch consisting of a cylindrical sleeve having laterally-extending
arms 5, two friction-segments engaging with said arms and capable of lateral
movements thereon, two cams S, oppositely secured to each of said segments, two
intermediate cams 9, engaging with said cams 8, each having a laterally-extending
arm adjustably connected thereto, a collar 3, capable of a longitudinal motion on said
sleeve, and links 14, pivotally connected between said collar and the arms on said cams 9,

page_text: a driving-pulley A, inclosing said segments, and retracting-springs between the latter,
substantially as set forth.
3. The driving-pulley A, the friction-segments 7, each having two oppositely-
secured cams 8, thereon, two intermediate cams 9, engaging with said cams 8, said
cams 9 each having a groove o therein, combined with the sleeve 2, having studs
thereon engaging in said grooves, a collar 3, having a longitudinal movement on said
sleeve, and link-and-arm connections, as described, between said collar and intermediate
cams, substantially as set forth.
Dated this 5th day of October 1888.