An Improved Clutch for Conveying Rotary Motion.
Year: 1890

page_text: COMPLETE SPECIFICATION.
An Improved Clutch for Conveying Rotary Motion.
I, EDWARD WALDRON, of 1829, Charlesee Avenue, in the City and County of
Philadelphia, and State of Pennsylvania, United States of America, 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:--
My invention has reference to pulley-clutches; and it consists of certain improve"
ments which are fully set forth in the following Specification, and shown in the
accompanying drawings, which form a part thereof.
The object of my invention is to provide a simple and yet positive clutch device for
connecting and disconnecting two shafts or other parts for the purpose of transmission
of power, und so that the shafts or other parts may be connected or disconnected while
running. In place of connecting two shafts one shaft may support a pulley and be
connected or disconnected with respect to said pulley.
In carrying out my invention I provide a friction-pulloy upon one shaft and a clutch-
carrying device upon the other shaft, the said parts being respectively connected and
rotating with their respective shafts, or I may have the clutch-carrying device and a
loose pulley on the one shaft.
The clutch mechanism, when intondel to connect two shafts, consists, essentially,
of a hub secured to one shaft and provided with pairs of arms or ribs, each pair of
which is furnished with pairs of projections which extend above and below the flange
of a pulley secured upon the other shaft, and connected to which arms and their pro-
jections and working between them are movable jaws adapted to grasp the said flange
of the pulley. These jaws are operated by a pivotel levor, which in turn is actuated
by means of a toggle arrangement connected with a sliding sleeve which may be
operated in any of the well known manners longitudinally upon the shaft. Adjusting
devices are employed between the two levers, whereby a given movement of the sleeve
may operate the jaws to grasp or release the flange of the wheel in a predetermined
manner. The same mechanism may be used to connect and disconnect a loose pulley
on the one shaft.
In the drawings Figure 1 is a sectional elevation, on line of Fig. 2, of the pulley
clutch embodying my invention. Fig. 2 is an end view of the same. Fig. 3 is a
sectional view on line y y of Fig. 1, and Fig. 4 is a plan view of the actuating-lever
mechanism.
A is one shaft and A' is the other. Upon the shaft A' is secured a pulley B, which
is provided with an overhanging rim b. Upon the other shaft A is secured a hub D,
proferably keyed to the shaft. The hub is provided with a frame having two or more
pairs of arms or ribs E, each pair of which consists of two parallel parts E E, pre-
ferably alike and with an opening or space e between them, and which it is desirable
shall extend all of the way through from the hub, and said opening or space is in the same
plane or parallel with the shaft. The arms E are provided at their outer ends with
projections S. S', which extend over the exterior and interior surfaces of the rim 6 of
the pulley B. This construction makes the ribs or arms E to extend beyond the inner
and outer surfaces of the pulley-rim B, and thereby form a positive support for the
pivoting and guiding of the outer and inner clamping-shoes. Arranged between the
arms or ribs, and respectively between the projections S and S', are frames F and J,
to which are respectively secured clamping-shoes H and 1, located upon each side of
the rim of the pulley. These frames F and J are guided laterally against the pro-
jections d, which enable fitting to be easily perforined, and also prevent excessive
friction to the moving of the parts when it is desirable that they shall be moved. The
frame F is preferably bell-crank shaped, and is provided with a slotf, arranged radially

page_text: with respect to the shaft A, and through this slot and the sides of the arms or
ribs E E is arranged a pin or holt G, which acts as a guide for the radial movement of
the said frame F. The inner frame Jis likewise provided with a radial slot j, through
which a similar pin or holl K passes, and which acts as a guide for the radial move-
ment of the frame J. This holt also passes through the sides of the ribs or arms E,
and with the holt G nets to strengthen said ribs and prevent them from being broken
by lateral strain. The lower end of theso jaws or frames J and Fare pivotal to the
lover M on opposite sides of the fulerum 0, "which is pivoted to the lever M. As this
levor M is rocked upon its fulerum ( the jaws Hand Lare drawn toward each other
to grasp the rim of the pulley, or move apart, and in their movement they are guide
by the pins G and K. As the lower ends are pivoted to the lover M, there will be a
very slight movement of the said fraines F and J about the pins G and K as fulcrums,
All of the movements therefore which could occur to the parts Fand are compensated
for. Pivoted to the fulcrum O of the lever M is a lever N, which is pivotally con-
nected at p to a link P, which is in turn pivoted at a to the sleeve L, which slides upon
the shaft A, and is provided with an annular groove 4, into which extends the shifting-
lever. The parts N and P constitute a form of toggle-joint, so that when the sleeve L
is moved away from the palley the link P swings on the pivot point a, and thus raises
the end of the lever N, and when the said sleeve is moved toward the pulley the link P
depresses the lover N, exerting an enormous power. The lovers 31 and N are con-
nected by means of the set-scrow Q, carried by the lever N, and adapted to press upon
the end of the lever M, and the connecting-screw R, which forms a loose connection
simply to raise the lever M when releasing the pulley-rim, so that a raising or lower-
ing of the lever N by the link P will correspondingly move the lever M on the fulcrum O.
This screw R is secured to the lever M and extends through a hole in the lever N,
and is provided with a head, which may he caught in the upward movement of the
lover N. It will now be understood that when the sleeve is moved toward the
pulley and the lever N depressed, the set screw Q presses upon the free end of the
lover M, o-cillating it upon its fulcrum (), and thereby thrusting the sho. I of the frame J
outward against the under surface of the rim of the pulley, and pulling the frame F
inward and its shoo H against the outer surface of th pulley, thus gripping the rim of
the wheel firmly and causing the two shafts A and Ato be coupled together. Any
degree of gripping with a given movement of the sleeve L may bo accomplished by
simply adjusting the screw Q. To release the pulley, it is simply necessary to move
the sleeve away from the pulley, which action, through the screw R and lover N
oscillates the lever M. in the opposite direction, with the effect of pulling the shoes of
the frames and J away from the rim, and thus releasing the pulley. It is evident
that while I have only shown two of such pairs of gripping devices arranged
diametrically opposite, any number of such parts may he employed, so that in place of
gripping the rim in two places in its circumference it may be gripped in any number
of places desired. It is quite apparent that the pulley B may run loosely upon the
shaft A, if desired, and act as a driving-pulley by placing a band upon it, as this is a
common practice in clutch-pulleys. In such a case the shaft A' may be stationary or
might be integral with shaft A. I do not limit myself to the minor details of con-
struction here shown, as they may be modified in various ways without departing from
the spirit of the invention.
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. In a pulley-clutch, the combination of a shaft, a pulley having a laterally-pro-
jecting rim, a pair of radial arms or ribs secured upon the shaft and having projections
extending laterally over both the inner and outer surfaces of the pulley-rim, there
being a radial space between said arms or ribs, a pair of movable frames having jaws
arranged between the arms or ribs and their projections for grasping the rim of the
pulley, guides for said frames to insure their being moved ra lially, and lever mechanism
adjacent to the shaft to simultaneously shift said frames in opposite directions.

page_text: 2. In a pulley-clutch, the combination of a shaft, a pulley having laterally-pro-
jecting rim, a pair of radial arms or ribs secured upon the shaft and having projections
extending laterally over both the inner and outer surfaces of the pulley-rim, there
being a radial space between said arms or ribs, a pair of movable frames having jaws
arringed between the arms or ribs and their projections for grasping the rim of the
pulley, guides for said frames to insure their being moved radially, and lever mechanism
adjacent to the shaft to simultaneously shift said frames in opposite directions. con-
sisting of a pivoted lever connected, respectively, upon each side of its fulcrum with
the movable frames, a sliding sleeve carried upon the shaft and connecting mechanism
between said sliding sleeve and lever.
3. In a pulley-clutch the combination of a shaft, a pulley having a laterally-pro-
jecting rim, a pair of radial arms or ribs secured upon the shaft and having
projections extending laterally upon both the inner and outer surfaces of the pulley-
rin, there being a radial space hetween said arms or ribs, a pair of movable frames
having jaws arranged between the arms or ribs and their projections for grasping the
rim of the pulley, guides for said frames to insure their being moved radially, and
lever mechanisin adjacent to the shaft to simultaneously shift said frames in opposite
directions, consisting of a pivoted lever having a connection with the respective
movable frames upon each side of the fulcrum, a second pivoted lever for operating
the first-mentioned lever, a sliding sleeve on the shaft, and a link-connection between
the sleeve and last-mentioned or second lever.
4. In a pulley-clutch, the combination of a shaft, a pulley having a laterally-pro-
jecting rim, a pair of radial arms or ribs secured upon the shaft and having projections
extending laterally upon both the inner and outer surfaces of the pulley-rim, there
being a ratial space between said arms or ribs, a pair of movable frames having jaws
arranged between the arms or ribs and their projections for grasping the rim of the
pulley, guides for said frames to insure their being moved radially, and lever
mechanism adjacent to the sbaft to simultaneously shift said frames in opposite
directions, consisting of a pivoted lever having a connection with the respective
movable frames upon each side of the fulcrum, a second pivoted lever for operating
the first-mentioned lever, an adjustable connection between the two levers, a sliding
sleeve on the shaft, and a link-connection between the sleeve and last-mentioned or
second lever.
5. In a pulley clutch, the combination of a shaft, a pulley having a laterally-pro-
jecting rim, a pair of radial arms or ribs secured upon the other shaft and having
projections extending laterally upon both the inner and outer surfaces of the pulley-
rim, there being a radial space between said arms or ribs, a pair of movable frames
having jaws arranged between the arms or ribs and their projections for grasping the
rim of the pulley, guides for said frames to insure their being moved radially, and
lever mechanism adjacent to the shaft to simultaneously shift said frames in opposite
directions, consisting of a pivoted lever having a connection with the respective
movable frame upon each side of the fulcrum, a second pivoted lever for operating the
first-mentioned lever, a set screw Q, carried by the last-mentioned lever and pressing
upon the first-mentioned lever, a sliding sleeve on the shaft, and a link-connection
between the sleeve and last-mentioned or second lever.
6. In a pulley-clutch, the combination of a shaft, a pulley having a laterally-pro-
jecting rim, a pair of radial arms or ribs secured upon the shaft and having projections
extending laterally upon both the inner and outer surfaces of the pulley-rim, there
being a radial space between said arms or ribs, a pair of movable fraines having jaws
arranged between the arms or ribs and their projections for grasping the rim of the
pulley, guides for said frames to insure their being moved radially, and lever mechanism
adjacent to the shaft to simultaneously shift said frames in opposite directions, consisting
of a pivoted lever having a connection with the respective movable frames upon each
side of the fulcrum, a second pivoted lever for operating the first-mentioned lever, a
set-screw Q, carried by the last-mentioned lever and pressing upon the first-mentioned
lever, lifting-screw R. carried by the first-mentioned lever and acting upon the

page_text: last-mentioned lever, a sliding sleeve on the shaft, and a link-connection between the
sleeve and last-mentioned or second levor.
7. In a pulley-clutch, the combination of a shaft, a pulley having a laterally-pro-
jecting rim, a pair of radial arms or ribs securod upon the shaft and having projec
tions extending laterally over both the inner and outer surfaces of the pulley-rim,
there being a radial space betwoon said arms or ribs, and provided with latoral
wearing and gaide projections d, a pair of movable framos having jaws arranged
between the arms or ribs and their projections for grasping the rim of the pulley,
guides for said frames to insure their being moved radially, extending through the
said frames and holding the arms or ribs from spreading, and lever mechanism
adjacent to the shaft to simultaneously shift said frames in opposite directions.
8. The combination of a shaft, a pulley having a laterally-projecting rim, a frame
secured to the shaft and having a pair of aruns or ribs extending away from the shaft
and beyond the rim of the pulley, there being a radial space between said arms, two
radially-movable clamping-frames arranged in the space hotwoon the arms or ribs,
guide-bolts extending through said frames and arms or ribs, and pivoted lover
fulcrumed upon the arms or ribs in line with the clamping-frames and connected with
them, respectively, upon each side of the fulcrum, a sliding sleeve upon the shaft, and
power mechanism between the sleeve and pivoted lever.
9. In a pulley-clutch, the combination of a shaft, a pulley having a laterally-pro-
jecting rim, a frome secured to the other shaft, a pair of movable clamping-frames
carried thereby and movable in opposite directions to grasp the rim of the pulley, a
pivoted lever M, fulcrumad to the frame, a pivoted lover N, fulcrumed also to the
frame, a sliding sleeve 1, a link connecting the sleave with the lever Na lifting
screw R, carried by the lever M and having its head resting upon lever N, to operato
said lover M. in one direction, and a set-screw Q, carried by the lever N and pressing
upon the end of the lever M, to operate said lovor in the other direction.
10. In a clutch, the combination of a shaft, a pulley B, having a laterally-pro-
jecting rim adapted to rotate concentric with the axis of the shaft, a hub having
arms E E, formed with projections S. S', secured to the shaft, frames F and J, as
shown, having jaws H and I and slots and j, guide-holis G and K on the arms, and
extending, respectively, through the slots and lever M. connected to
frames and J, as shown, and fulerumed at 0, and means to move the lover to clamp
or release the pulley.
11. In a pulley-clutch, the combination of a shaft having a pair of radial arms
extending laterally and separated a distance one from the other, so as to form an
intermediate space, a pulley having a laterally-projecting rim, a pair of radially-
movable frames for grasping the rim of the pulley arranged between said laterally-
extending arms, and lever mechanism to simultaneously shift the frames in opposite
directions.
12. In a pulley-clutch, the combination of a pulley having laterally-projecting rim,
a shaft having a pair of radial arms extending Interally and separated a distance one
from the other, so as to form an intermediate space, and having laterally-projecting
portions extending on each side of the rim of the pulley, a pair of movable frames for
grasping the rim of the pulley and arranged between snid arms and their lateral pro-
jections, and lever mechanism to simultaucously shift the frames in opposite directions.
Dated this 10th day of September 1890.
F. W. BARKER,
Applicant's Agent.