Improvements in Clip Pulleys.
Year: 1891

page_text: Date of Application, 24th Dec., 1891
Complete Specification Left, 19th Sept., 1892-Accepted, 22nd Oct., 1892
PROVISIONAL SPECIFICATION.
Improvements in Clip Pulleys.
We, JOHN HASTIE, of Kilblain Engine Works, Greenock, in the County of
Renfrew, North Britain, Engineer, JAMES SHAW, of Glenville, Holmhead Road,
Cathcart, in the same County, Marine Surveyor, and WILLIAM HASTIE, of
Kilblain Engine Works, aforesaid, Engineer, do hereby declare the nature of this
invention to be as follows, that is to say :-
This invention has for its object the construction in an improved manner of
pulleys for acting on, or being acted on by ropes or chains, and which are made
with automatic clipping devices for gripping the ropes or chains throughout definite
extents of their circumferences.
In carrying out the invention according to one modification, the pulley disk is
made with a rigid outer part at one side and corresponding to one side of the grooved
part of an ordinary grooved pulley. The part for the other side of the groove is
made to consist of a series of seginents which are hinged to the pulley disk, or are
otherwise connected or fitted thereto in a manner to allow them to move to a limited
For making the segments grip a
extent towards and from the rigid groove side.
rope or chain each is acted on by a wedge formed on the outer end of a radial bar
fitted to slide in a radial guide on the face of the pulley disk. Each radial bar has
at its inner end a right-angle pin which projects into a groove in a fixed cam, this
groove being shaped so as to move the radial bars in and out as the pulley rotates
and so as to thereby apply the gripping action at the required part or parts of the
circuit.
A distinguishing feature of the arrangement is the deriving of the gripping action
from a stationary or fixed cam shaped to suit the locality and extent of the required
gripping action.
With the object of increasing the gripping hold the parts may be shaped to
present an undulatory form of groove. There may be movable segments on both
sides of the pulley disk, either facing each other or at alternate intervals; and the
appliances by which the action of the fixed cam or eccentric is communicated to
the movable segments may be varied in different cases.
DLÍKÁ Twenty-third day of December 1891.
BAK
LILINT
EDMUND HUNT
Applicants' Agent.
COMPLETE SPECIFICATION.
Improvements in Clip Pulleys.
We, JOHN HASTIE, of Kilblain Engine Works, Greenock, in the County of
Renfrew, North Britain, Engineer, JAMES SHAW of Glenville, Holmhead Road,
Cathcart, in the same County, Marine Surveyor, and WILLIAM HASTIE of
Kilblain Engine Works, aforesaid, 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, that is to say :-
This invention has for its object the construction in an improved manner of
pulleys for acting on; or being acted on by ropes or chains, and which are made
with automatic clipping devices for gripping the ropes or chains throughout definite
tants of their circumferences.

page_text: In carrying out the invention according to one modification one side of the
grooved part of the pulley is made rigid and similar to an ordinary grooved pulley,
while the other consists of a series of segments connected to the pulley disk in a
manner to allow them to move to a limited extent towards and from the rigid side.
A stationary cam, as the pulley rotates, moves out and in radial bars arranged by
their movement to cause the segments to close toward the rigid side of the groove
and grip the rope or chain at the required part of the circumference of the pulley.
And in order that the said invention and the manner of performing the same may
be properly understood we hereunto append a sheet of explanatory drawings, to be
hereinafter referred to, and showing examples of the improvements in clip pulleys.
Figure, 1, of the drawings, is a transverse vertical section of the pulley, the cam
and the frame pieces supporting them.
Figure, 2, is a back elevation of the pulley without the cam and one frame
piece, and
Figure, 3, is a back elevation of one of the segments detached.
Figure, 4, is an inner-side elevation of one frame piece with cam adjustably fixed
to it; and
Figures, 5, and, 6, are a transverse vertical section and an inner-side elevation
showing another form of cam. In these drawings the same reference letters and
numerals are used to mark the same or like parts wherever they are repeated.
As shown in Figure, 1, of the drawings the pulley disk, A, is made with a rigid
outer rim part, A 1, at one side, corresponding to one side of the groove of an
ordinary grooved pulley. The part for the other side of the groove is made to
consist of a series of segments, B, which are hinged to the pulley disk, A, by a
pin B 1, or they may be otherwise connected or fitted thereto in a manner to allow
them to move to a limited extent towards and from the rigid groove side, A. 1. For
making the segments, B, grip a rope or chain, an inclined rib, C, is formed on the
outer side of each of them, and is acted on by a knob, C 1, of brass or other suitable
material, fixed to the outer end of a radial bar, D, fitted to slide in a radial
guide, D1, formed in the body of the pulley. Each radial bar, D, has at its inner
end a right-angle pin, D2, which projects into a groove, E, in a fixed cam or
eccentric, E 1, the groove being shaped so as to move the radial bars, D. in and out
as the pulley disk, A, rotates. This in and out movement imparted by the groove, E,
to the radial bars, D, causes them to have a wedge-like action on the inclined
ribs, C, the form of the groove causing the gripping action of the segments, B, to
take effect at the required part or parts of the circuit.
A distinguishing feature of the arrangement is the deriving of the gripping action
from a stationary or fixed cam, E 1, shaped to suit the locality and extent of the
required gripping action. This cam, E1, although securely fixed and stationary
when the pulley, A, is in motion, can as shown in Figures, 1, and, 4, be adjusted by
means of bolts, F, and slots, F 1, formed in the frame piece, G, to allow of varying
the amount of eccentricity of the cam. The amount of the eccentricity of the cam
regulates the extent of the inward gripping movement imparted to the segments, B,
as the farther the radial bars, D, are moved from the centre from which they
radiate the more they will move the segments towards the rigid side, A 1, of the
groove of the pulley, A. Where an adjustable form of cam is not required it may
be permanently fixed to or cast in one piece with the frame piece, G, as shown in
Figures, 5, and, 6. Figure, 6, also shows the cam as formed so as to retain the
radial bars, D, in their outermost position through a considerable part of the
circuit.
With the object of increasing the gripping hold the inner parts of the segments, B,
and the inner side of the rigid part, A 1, of the pulley disk, A, may be shaped so as
to present an undulatory form of groove. There may be movable segments, B, if
desired on both sides of the pulley disk, A, either facing each other or at alternate
intervals; and the appliances by which the action of the fixed cam oreccentric, E 1,
is communicated to the movable segments, B, may be varied in different cases.

page_text: Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed we declare that what
we claim is :-
:―
1. An improved clip pulley having at one or each side of its groove a series of
movable segments arranged, as the pulley rotates, to move inwards by the action of
radial bars connected to a stationary cam shaped and arranged to cause the gripping
action to take place at a part of the circuit, substantially as and for the purposes
hereinbefore described.
2. An improved clip pulley having at one or at each side a series of movable
segments the parts being shaped to present an undulatory form of groove substan-
tially as and for the purposes hereinbefore described.
Dated this Seventeenth day of September 1892.
EDMUND HUNT,
Applicants' Agent.