Improvements in Clip Pulleys.
Year: 1892

page_text: Date of Application, 13th Apr., 1892
Complete Specification Left, 12th Jan., 1893-Accepted, 18th Feb., 1893
PROVISIONAL SPECIFICATION.
Improvements in Clip Pulleys.
We, JOHN HAYTHORN, and JAMES STUART, of Eastwood Engine Works,
Pollokshaws, in the County of Renfrew, North Britain, Engineers, do hereby
declare the nature of this invention to be as follows, that is to say :-
Our said invention has for its object to improve and simplify the contraction and
increase the efficiency of clip pulleys.
In carrying out our invention we provide separate conical or conoidal rims or
flanges for gripping a rope or chain between them, and we arrange so at the part of
the circuit whereat the gripping action is to take place the two rims move or are
pressed close enough together for the purpose. In one modification the two rims
are formed or fixed on disks or wheel frames arranged to turn about axes which
are inclined to each other more or less, a very small inclination being in some cases
sufficient. One disk or wheel frame may be fixed on a driving or driven shaft,
the other being carried on a stud or on a tube through which the shaft passes, teeth
or equivalent devices making the two rotate together. In another modification both
parts are carried on the same shaft, one part being on a spherical boss or other-
wise made capable of rotating in a position inclined to the other part; or both
parts may be on spherical bosses. If required an adjustable antifriction pressing
roller may be mounted so as to bear against the outside of the movable part at the
gripping position; or such rollers may be applied to both parts.
Dated this Twelfth day of April 1892.
ידהוזז-זמ
EDMUND HUNT,
Applicants' Agent.
COMPLETE SPECIFICATION.
Improvements in Clip Pulleys.
We, JOHN HAYTHORN, and JAMES STUART, of Eastwood Engine Works,
Pollokshaws, in the County of Renfrew, North Britain, Engineers, 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 :-
Our said invention has for its object to improve and simplify the construction and
increase the efficiency of clip pulleys.
In carrying out our invention we provide separate_conical or conoidal rims or
flanges for gripping a rope or chain between them. In one modification the two
rims are formed or fixed on disks or wheel frames arranged to turn about axes
which are inclined to each other more or less, a very small inclination being in
some cases sufficient. One disk or wheel frame may be fixed on a driving or driven
shaft, the other being carried on a stud, or on a tube through which the shaft
passes, teeth or equivalent devices making the two rotate together. In another
modification both parts are carried on the same shaft, one part being on a spherical
boss or otherwise made capable of rotating in a position inclined to the other part;
or both parts may be on spherical bosses. If required an adjustable antifriction
pressing roller may be mounted so as to bear against the outside of the movable
part at the gripping position, or such rollers may be applied to both parts.
And in order that our said invention and the manner of performing the same
may be properly understood we hereunto append two sheets of explanatory
drawings to be hereinafter referred to and showing three simple examples of our
improved clip pulleys.

page_text: Figure, 1, on Sheet, 1, of the accompanying drawings is a transverse vertical
section of one modification of our improved clip pulley.
Figure, 2, is a similar view of a second modification.
Figure, 3, on Sheet, 2, is a transverse vertical section and Figure, 4, a sectional
side elevation, showing a third modification.
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 two conical or conoidal rims or
flanges, A1, A2, for gripping a rope, B, or chain between them are formed on
disks or wheel frames, C 1, 2, one C 1, of which is fixed by means of a key, D,
on a driving or driven shaft, E 1, the other, C 2, being on a brass liner, or
bush, F, which turns on a stud, E 2, fixed to framing not shown. The shaft, E 1,
and stud, E 2, are supported so as to be inclined to each other and so that at the
part of the circuit whereat the gripping action is to take place the two rims, A 1, A 2,
move close enough together for the purpose. Teeth, G, on the inside of each
disk, C1, C2, make the two rotate together. If required an adjustable antifriction
pressing roller, H, (shown in dotted lines) may be mounted so as to bear against
the outside of the rim, A 2, at the gripping position, or such a roller may be
applied to both rims. The rope or chain to be gripped should pass round one half
or somewhat less of the pulley so that its tension may act on the gripping parts
in a manner to move or tend to move them inwards.
In the modification shown in Figure, 2, the shaft, E 1, on which the disk, C 1,
is keyed extends through a tube, J, on the inner end of which the other disk, C2,
is formed, this tube turning in bearings (not shown) placed so as to give the
necessary inclination to the parts and cause the gripping action of the rims, A 1, A 2,
to take place at the desired part of the circuit.
As shown in Figures, 3, and, 4, the gripping rims, A 1, A 2, are shaped so as
to fit spherical surfaces formed on disks or bosses, K1, K2, which are connected
together by means of bolts and nuts, L, the adjustment of which determines the
mean distance apart of the rims, A 1, A 2, to suit the size of the rope or chain, B.
Teeth, G, on the boss, K 1, and rims, A 1, A 2, cause the parts to rotate together
and as the rims, A 1, A 2, do not fit tightly on the bolts, L, the tension of the
rope, B, at the gripping part of the circuit will make the rims shift on the spherical
surfaces so as to grip the rope. Springs, M, are placed in a number of recesses
formed in the rims, A 1, A 2, to tend to separate the rims at the part opposite
that where the main grip occurs.
Having now particularly described and ascertained the nature of our 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 a pair of gripping rims formed or fixed on
disks or wheel frames rotating together and arranged to turn about axes which
are more or less inclined to each other and with or without an adjustable anti-
friction pressing roller or rollers to bear on the outside of the gripping rim or
rims all substantially as herein before described, with reference to Figures, 1,
and, 2, of the accompanying drawings.
2. An improved clip pulley having a pair of gripping rims fitted and movable
on spherical surfaces on bosses or disks, on a shaft the parts being arranged and
operating substantially as herein before described, with reference to Figures, 3,.
and, 4, of the accompanying drawings.
Dated this Eleventh day of January 1892
EDMUND HUNT,
Applicants' Agent.