Improvements in or relating to Friction Clutch Pulleys.
Year: 1894

page_text: Date of Application, 20th Mar, 1894-Accepted, 12th May, 1894
COMPLETE SPECIFICATION.
Improvements in or relating to Friction Clutch Pulleys.
I REGINALD HADDAN of the Firm of Herbert Haddan & Co., of 18 Buckingham
Street, Strand, London W.C. Patent Agent, do hereby declare the nature of this
invention, a communication to me from abroad by William Winfield Wallace, of
Willoughby, County of Lake, and State of Ohio, United States of America,
Mechanical Engineer, 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 clutch pulleys, wherein the
mechanism for operating the clutch is, in the main, mounted on and located inside
the pulley, and hence this mechanism only revolves when the pulley revolves, and
consequently this clutch mechanism can be adjusted, oiled, and cared for without
stopping the shafting.
This invention also relates to the details of construction hereinafter described
and pointed out in the claims.
In the accompanying drawings Figure 1 is an end elevation of a friction clutch
pulley embodying this invention and Fig. 2 is a side elevation of the same in
central section, portions being broken away in said figures to more clearly show the
construction.
A represents the rim of the pulley, B the arms and C the hub thereof, the pulley
being mounted loose on shaft D. The hub of the pulley is bored large enough to
receive the sleeve C¹ with a driving fit. The sleeve is long and is bored to fit the
shaft loosely. This sleeve can be removed and a new sleeve inserted whenever such
change may be found necessary from wear of the parts. It is good practice to
construct the sleeve of some anti-friction metal, such as, by reason of the cost,
could hardly be afforded for the whole pulley. E is what for convenience we will
call the friction disk, although in reality it is usually a spider with a flat rim,
member E being mounted rigidly on the shaft at the one end of the pulley. Two
or more of pulley arms B are bored laterally to receive, respectively, steady
pins b, b. Usually these pins 6 are reduced in size where they enter the holes in
the arms, so that there are shoulders of these pins to engage the outer faces of
these arms.
Pins b are inserted usually with a driving fit and are further secured
by lateral pins b¹.
F and G designate flat rings that are mounted on pins b, said rings having lateral
holes that fit easily over the pins. Ring F is located between the pulley and
member E while ring G is located next outside the member E, and by clamping the
latter between rings F and G, the frictional force is generated for driving the
pulley. There are springs & coiled round bolts J, these springs being located
between the rings F and G. When rings F and G are drawn toward each other to
clamp the friction disk, springs are thereby compressed and the recoil of the
springs forces the rings apart so that normally they do not engage the friction disk.
It will be observed that the diameter of member É is such that it comes within the
line of pins b, while the size of rings F and G is such that these rings overlap
member E for some distance for frictional engagement. I will here remark that
the opposing faces of rings F and G are preferably lined with plates of vulcanized
hardwood fibre, such plates or sheets of fibre to be rivetted on and renewed as often
as necessary. The inner ring F on the face thereof next the pulley, is provided
with laterally projecting ears or flanges farranged in pairs as shown more clearly
in Fig. 1. Between each pair of ears is located a lever I that is fulcrumed to the
ears at . The short arm of each lever I is pivotally connected at ? with an

page_text: eyebolt J upon which springs 6', hereinbefore referred to, are mounted. Bolts J
extend with easy fits through holes in rings F and G, each bolt being provided
with jam-nuts as at J' located next outside of ring G. By adjusting these nuts
may be regulated the pressure of rings F and G against the intervening friction
disk E. Located between each pair of ears and fulcrumed thereto at f' is an
angular lever K. Each lever K has a lug or projection at the elbow thereof, for
engaging the outer face of the free end of the opposing lever I. The outer end of
each lever K is pivoted at to a link L, these links serving as toggle-arms. The
other ends of links L operate between and are pivoted to ears m of the collar M.
This collar is mounted loosely on sleeve C¹ aforesaid. Collar M has an annular
groove m' in which groove operates the split ring N. The latter has trunnions n
to be engaged by the fork of a forked hand lever, not shown, that is supposed to be
hinged to the ceiling above and to extend down within reach of the operator.
When collar M is moved towards the right hand, relative to Fig. 2, links L are
thereby inclined and operate levers K in the direction to allow the clutch to open.
When collar M is moved towards the left-hand until the links are perpendicular to
the line of the shaft, the parts will maintain such position without fastening, and in
such position of parts the clutch will be closed, that is to say, the friction disk E
will be clamped between rings F and G thereby causing the pulley to revolve with
disk E. It will be observed that ring G has a flange g projecting beyond the line
of pins b, so, that if the belt should fly off the pulley, this rim or flange g will
prevent the belt from colliding with pins bor bolts J. Also the collar P that holds
sleeve C¹ end wise in the one direction, has a rim p that projects over and protects
the set screw. p' that fastens the collar on the shaft, and heuce this set screw does
not menace the belt, or anything else, for that matter. 1 will again call attention
to the important fact that, when the friction clutch is open, not only the pulley
stops, but also stops all the mechanism for operating the. clutch, and the only
member that continues to revolve with the shaft is the friction disk E. Hence,
when the pulley is at rest, all of the aforesaid mechanism for operating the clutch
can be adjusted, cleaned, oiled or repaired without stopping the shaft. This is a
matter of great importance, as in a large factory where there are likely to be many
friction clutch pulleys in use, it would be a serious matter to be obliged to shut
down every time one of these pulleys needed attention. Even nuts J' that regulate
the frictional force of the clutch can be manipulated just as well when the shaft is
running, and, owing to the wear of the friction surfaces, such adjustment may be
required at any time.
Having now particularly described and ascertained the nature of this inven
tion and in what manner the same is to be performed, I declare that what I
claim is.
1. In combination with a loose pulley having pins projecting laterally from the
arms of said pulley, friction rings mounted on said pins, a friction disk rigidly
mounted on the shaft and located between such friction rings, and mechanism for
causing the friction rings to grasp or release the disk, substantially as and for the
purpose set forth.
2. In combination with a loose pulley having pins projecting laterally from the
arms of said pulley, friction rings mounted on the pins, bolts between.said rings and
coiled springs on said bolts and adapted to force the rings apart, levers for drawing
the rings toward each other, such levers being mounted on one of the friction rings
and located inside the pulley, and a friction disk rigidly mounted on the shaft and
located between the friction rings, substantially as set forth.
3. The combination with a loose pulley having pins projecting laterally from the
arms of said pulley, friction rings mounted on such pins, the outer friction-ring
having a peripheral rim projecting beyond and outside of the said pins, a friction
disk rigid on the shaft and operating between the friction rings, and mechanism for
operating the rings in grasping or releasing the friction disk substantially as and
for the purpose set forth.

page_text: 4. In combination, a friction clutch pulley having pins projecting laterally from
the arms of the same, friction rings connected by said pins to the pulley, a friction
disk secured rigidly to the shaft and operating between the said rings for driving
purposes, and mechanism for causing the friction rings to grasp or release the disk
substantially as set forth.
71.
تيمم
T
1 2004
R. HADDAN.