Improvements in Pulleys.
Year: 1891

page_text: Date of Application, 30th June, 1891-Accepted. 8th Aug., 1891
COMPLETE SPECIFICATION.
Improvements in Pulleys.
I, ISAAC NEWTON KENDALL, of New Westminster, in the Province of British
Columbia, Dominion of Canada, Gentleman, 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 has relation to pulleys of that class adapted to be used in connec-
tion with rope or wire cable. The objects in view are to provide a pulley which
will automatically grasp the rope or cable at one portion of its revolution and
release the same at the remaining half of its revolution; to provide means for
gripping and releasing the rope automatically and furthermore to provide means
for compensating for wear.
With the above objects in view, the invention consists in certain features of-
construction hereinafter specified and particularly pointed out in the claim.
Referring to the drawing:-
-
Fig. 1 is a vertical longitudinal section of a shaft and a pulley constructed in
accordance with my invention mounted thereon.
Fig. 2 is a face view of the pulley.
Fig. 3 is a detail in perspective of the bearing for one end of the shaft.
Fig. 4 is a similar view of the sliding collar.
Fig. 5 is a plan view of a slightly different construction of clamp.
Fig. 6 an elevation partly in section, thereof.
Fig. 7 an underside view and
Fig. 8 a vertical transverse section.
Like numerals of reference indicate like parts in all the figures of the drawings.
I designates a shaft mounted at one end in a bearing 2 lined with Babbitt metal.
3 designates the opposite bearing, the rear end being extended in rear of the
bearing proper and upwardly turned to form an end wall 4 having a central
opening 5, in which is mounted a brass centrally-bored and threaded bushing 6 the
inner end of which is beyond the inner surface of the end wall 4 and is provided
with an annular flange 7. Between the annular flange 7 and the inner face of the
wall 4 a rubber ring or washer 8 encircles the bushing and threaded in the bushing
is a screw 9 terminating at its inner end in a head or bearing point and provided at
its outer end outside of the bushing with a hand-wheel 10. In front of the bearing
proper 3 and in line therewith there is located and integrally formed therewith a
hollow centrally-bored tube or bearing 11, the rear end of which is provided with
an annular flange 12. The interior of both bearings 3 and 11 are provided with
linings of Babbitt metal.
Between the inner end of the tube or bearing 11 and the bearing 2 there is keyed
upon the shaft the circular concavo-convex shell or casting 13 which upon its
concave side is provided with a half-groove 14. At intervals the inner or concave
face of the shell is provided with pairs of bearing ears 15 and between each pair of
bearing ears there is pivoted upon a pintle 16 a clamping lever 17, the outer end of
which upon its inner side is provided with half a groove 18 combining with the
groove 14, and the inner end of which occurs short of the centre of the shell.
Trunnions 18 are located at the opposite sides of the levers and said trunnions
are perforated to receive the aforesaid pintles. The levers are wedge-shaped or
widened toward their ends and between the levers there is cast to the face and near
the edge of the shell half grooved projections or lugs 19. These projections or lugs
are duplicated between the inner ends of the levers as shown at 20.
21 designates a sleeve mounted for sliding upon the tube or sleeve 11. The
sleeve 21 is provided at its rear end with an annular flange 22 provided at intervals

page_text: with perforations 23 which occur opposite similar perforations formed in the
annular flange 12. The two flanges are connected by means of screws or bolts 24
passing through the perforations 23. and between the two flanges upon each bolt is
mounted a set nut 25. By operating these nuts, the sleeve 21 may be fed to or
from the pulley. At its inner end the sleeve 21 is provided with an annular
flange 26 which extends above the inner ends of the clamping levers, as shown.
The upper portion of the flange 21 is provided with a rearwardly extended
track 27, said track extending round the flange for about one-half its circumference
and over the track and the flange ride the inner ends of the clamping levers.
This being the construction, the operation is as follows: As the shaft-1-revolves
it carries with it the shell or pulley 13 and the inner ends of the levers 17 riding
over the raised track 27 causes the outer ends of the levers when in this position to
be pressed toward the shell and thus a cable or rope located in the grooves 14
and 18 is securely clamped and prevented from slipping. This clamping of a lever
upon the cable continues for a half revolution or by the time the same arrives
opposite the point where the cable passes upon the pulley, said clamping being
maintained until the end of the track 27 is reached when the lever is released from
the track and the remainder of the revolution passes around the face of the
flange 26 so that as one lever is thrown into a clamping position at the upper side:
of the pulley, another lever is releasing the cable at the lower side of the pulley.
In this manner it will be apparent that all slipping of the cable or rope is absolutely
avoided and the engagement of the rope to the cable made positive.
It will be apparent that in time the track 27 and the ends of the levers will
become worn and for this reason I provide the adjustment described.
By operating the wheel 10 the screw 9 is fed forward and thus forces the shaft
and the shell away from the sleeve 21 so that the wear of the parts will be fully
compensated for and the durability of the device is greatly increased. By operating
the nut 25 a final adjustment may be obtained for the purpose of adjusting the
levers 17. By reason of the rubber packing 8 it will be apparent that the shaft is
permitted to move slightly in cases where splices or other enlargements pass over
the pulley and therefore danger of breaking the parts is avoided.
In Figs. 5 to 8 I have illustrated a slight modification in the construction and
arrangement of my clamping device. The lever 17 is here shown pivotally
connected to the shell 13 by means of but one ear 15, which is secured at one end
to the shell by means of bolt 15* and its other end passing within a cavity or
recess 15 formed in one side of the lever and through which ear and the said lever
passes the pin 16, whereby said lever is pivoted to the ear. A rubber washer 15³
interposed between the head of bolt or pin 15* and the side of the shell serves as a
cushion to allow slight yielding of the lever and wheel when a splice or other
enlargement in the rope passes over the pulley.
.
A threaded bolt 15 passes through the inner end of the lever 17 and bears upon
the face of the shell and by adjusting said bolt throws the outer end of the lever
towards or from the shell as will be understood.
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 combination of the grooved pulley and a series of levers fulcrumed upon
the face of the pulley and having the outer ends thereof provided with grooves
opposite the groove of the pulley and an adjustable non-rotating sleeve provided at
its inner end with a flange having a track for engaging the inner ends of the levers,
substantially as specified.
2. The combination with the pulley, the side of which is grooved and the series
of clamping levers fulcrumed upon the face of the pulley and grooved near their
outer ends, of a sleeve mounted for longitudinal adjustment upon the same and a
flange provided with a track for operating against the inner ends of the levers and
mounted upon said sleeve, substantially as specified.

page_text: 3. The combination with the pulley, its shaft, the clamping levers and means for
operating the same of the bearing for one end of the shaft, a set screw supported in
the bearing and bearing against the end of the shaft, a bushing encircling the set
screw and provided upon its inner end with a flange, and a rubber or other yielding
packing encircling the bushing and interposed between the same and the end of the
bearing substantially as specified.
4. The combination with the pulley shell, the series of pairs of bearing lugs
secured to the face of the same, the series of levers pivoted between the bearing
ears, the grooved lugs 19 and 20 located between the levers, the bearing 3 for the
end of the shaft, the shaft 1, the tube or sleeve 11 having the flange 12, the sliding
sleeve 21 splined upon the sleeve 11 and provided with the rear flange 22 and the
front flange 26 having the track 27 for operating the levers, the bolts 24 connecting
the rear flanges of the two sleeves, the nuts mounted upon the bolts between the
flanges, the headed bushing 6 located in the rear end of the bearing 2, the adjusting
screw threaded in the bushing terminating at its inner end against the shaft and at
its outer end provided with a hand-wheel, and the rubber packing 8 interposed
between the head of the bushing and the bearing, substantially as specified.
5. The combination with the pulley provided with a bearing ear secured thereto,
of a clamping lever provided upon one face with a recess into which the bearing car
projects, a pin passing through said lever and the bearing-ear, and an adjustable
bolt carried by the lever near its inner end and adapted to bear upon the side of
the pulley, as and for the purpose specified.
6. The combination with the pulley provided with a bearing ear secured thereto
by means of a pin or bolt, and an elastic washer interposed between the pulley and
the head of said securing bolt, of a clamping lever pivotally connected to said
bearing ear, as and for the purpose specified.
Dated this 20th day of June 1801
W. P. THOMPSON & BOULT,
Agents for the Applicant.