An Improved Method of and Means for Attaching Pulleys and the like to Shafting.
Year: 1895

page_text: Date of Application, 23rd Feb., 1895
Complete Specification Left, 30th Aug., 1325-Accepted, 26th Oct., 1895
PROVISIONAL SPECIFICATION.
An Improved Method of and Means for Attaching Pulleys and the
like to Shafting.
We, WEST MUSSELWHITE, and HENRY SIMPKINS, both of the Steam Cabinet
Works, Mannington Place, Commercial Road, Bournemouth, in the County of
Hants, Cabinet Makers, do hereby declare the nature of this invention to be as
follows:-
--
This invention relates to pulleys, wheels, couplings, and the like, and consists of
improved devices for attaching the same to shafting; whereby we are enabled to
secure an easy and convenient adjustment, together with a firm grip or hold upon
the shaft without the use of set screws, or keys, as ordinarily employed for the
purpose.
In the simplest form of our invention we cut a slot or recess through the whole
length of the bore of a pulley boss, and this recess is cut to a greater depth at one
of its sides than the other in such manner that its surface is not parallel with the
surface of the shaft. In this slot or recess we insert a roller, or rollers of a
diameter slightly smaller than the difference between the radius of the shaft
and that of the deepest side of the slot or recess. We then screw, or otherwise
attach a plate to each end of the boss, so as to keep the roller from moving
laterally.
If the pulley is now turned in such a direction that the shallow side of the recess
is in advance of the deep side, the roller or rollers draw naturally towards such
deep side; and as it runs slack therein the pulley is free to rotate while the shaft
is stationary. But if the direction be reversed, and the deep side of the recess
moves in advance of the shallow, the roller or rollers draw naturally towards such
shallow part, and the difference of the two radii being, as herein before stated,
less than the diameter of the roller, the shaft, and the pulley, wheel, or the like
becomes locked and fixed together, without the use of keys or similar equivalent
devices.
In order that our device may enable the same pulley to be applied to different
sizes of shafting, we bore the pulley to a larger size, and fit into such bore a bush
(divided lengthwise into halves) which has the slot or recess cut in its bore, for
containing the roller, or rollers; and a similar recess being cut in the bore of the
pulley, may be used either for a second roller, or for a key. Bushes, all having
similar outside diameters, but different inside diameters, may thus be made to fit the
same pulley.
In some cases we use a similar bush but split it only in one place, and in this
case its springing outwards by the pressure of the roller locks the shaft, bush, and
pulley together.
By using two of the hereinbefore described slots or recesses, and rollers, arranged
in opposite directions, and of different breadths, and degree of inclination, we can
retain the simple and easy adjustment, and yet lock and fix the shaft and pulley
together, in whichever direction they rotate.
Dated this 23rd day of February 1895.
W. H. MURCH,
Upper Terrace Road, Bournemouth, Agent for the Applicants.

page_text: An Improved Method of and Means for Attaching Pulleys and the
like to Shafting.
We, WEST MUSSELWHITE and HENRY SIMPKINS, both of the Steam Joinery
Works, Mannington Place, Commercial Road, Bournemouth, in the County of
Hants, Cabinet Makers, 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 relates to pulleys, wheels, couplings, and the like, and cousists of
improved devices for attaching the same to shafting; whereby we are enabled to
secure an easy and convenient adjustment, together with a firm grip or hold upon
the shaft without the use of set-screws or keys, as ordinarily employed for the
purpose.
In the simplest form of pulley according to our invention we cut a slot or recess
through the whole length of the bore of a pulley boss, and this recess is cut to a
greater depth at one of its sides than the other in such manner that its surface is
not parallel with the surface of the shaft. In this slot or recess we insert a small
roller or rollers of a diameter slightly smaller than the difference between the
radius of the shaft and that of the deepest side of the slot or recess. We then
screw or otherwise attach a plate to each end of the boss so as to keep the roller or
rollers from moving laterally.
If the pulley is turned in such a direction that the shallow side of the recess
is in advance of the deep side, the roller draws naturally toward such deep side,
and as it runs slack therein, the pulley is free to rotate while the shaft is stationary.
But if the direction of rotation be reversed, and the deep side of the recess moved
in advance of the shallow the roller draws naturally towards such shallow part,
and the difference of the two radii being as herein before stated, less than the
diameter of the roller, the shaft, and the pulley or wheel becomes locked and fixed
together without the use of keys or similar equivalent devices.
In the accompanying drawings:
:-
Fig. 1 is an elevation of a pulley according to our invention.
Fig. 2 is a section of same.
Fig. 3 is a section on an enlarged scale through the boss of the same.
Fig. 4 is an elevation of the boss of a pulley in which a bush is used.
Fig. 5 is an elevation of the boss of a pulley with a spring bush.
Fig. 6 is an elevation of the boss of a pulley which can be tightened by rotation
in either direction.
In Figs. 1, 2, and 3 A designates the rim, B the arms, and C the boss of a
pulley which is bored as usual to fit the shaft X. In this bore a slot or recess c¹
is cut through the whole length of the boss, and it is of the shape shewn, being cut
to a greater depth on the side e³ than on the side c³, and consequently the recess is
of a shape both curved and tapered. The ends of this recess are preferably
closed by plates c³ which are screwed or otherwise attached to the ends of the
boss C.
In this recess a cylindrical pin or roller D of a diameter slightly less than the
depth of the side of the recess is placed, and by reason of this relation of its
diameter to the depth of the recess it is free to rotate when occupying that part of the
recess which is near the side ³, but becomes tightened between the convex surface
of the shaft and the concave surface of the recess when it is forced towards the
shallow side c². The bore of the pulley fitting easily on the shaft it follows that

page_text: when the pulley is turned in the direction of the arrow, the pin, roller or rollersi
draw towards the deep side of the recess, and the pulley can thus be turned.freely
or caused to slide in a direction longitudinal to the shaft. But if the pulley be
turned through a small angle in an opposite direction to the arrow, the pin or
roller draws towards the shallow side of the groove, and is gripped by the two
surfaces concave and convex, thus locking the pulley and shaft together and
rendering it impossible for the former to turn in an opposite direction to that
indicated by the arrow, without rotating the shaft with it. The pin or roller is
somewhat shorter than the distance between the two boss plates c³.
In Fig. 4 the boss C is bored to a larger size than the diameter of the shaft, and
has a bush E divided lengthwise into halves by the slit e.
A recess or slot c¹ similar to that already described is cut in the concave surface
of one of these halves, and another exactly similar slot or recess c' in the bore of
the pulley with a deep side c³ and a shallow side c³, and by arranging these as
shewn with a roller D or D' in each, the shaft ✗, the bush E, and the pulley
boss C can be locked together, or run loose as before described. Instead of a
pin D' being placed in the recess c, a key can be fitted to it, and if necessary a
flat or groove formed on the bush E. By having a number of these bushes all of
equal diameters outside, and of different diameters inside, the same pulley can be
fitted to many different sized shafts.
In Fig. 5 the bush has only one side slit at e¹ and the gripping of the pin or
roller D between the concave and convex surfaces springs this open sufficiently to
tighten and lock the boss and the bush together.
In Fig. 6 is shewn a method of construction in which the pulley can be made to
rotate through a very small angle while remaining loose, but to grip the shaft and
lock the two together if moved through a greater angle in either direction. For
this purpose we form a recess c¹ as before, but in addition we lengthen this recess
so as to have two shallow sides c2 and g, and the deep part g¹ half way between
these two sides the recess being thus crescent shaped. The pulley can thus be
loosened by rotating it through such a small angle in either direction as brings the
roller D to the deep part g', and it can then be made to slide any distance on the
shaft. But if it be turned through a greater angle in either direction it becomes
locked. Two separate recesses and pins or rollers may be used instead of one
double recess.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
1. The improved method of attaching pulleys and the like to shafting, which
consists essentially in forming a tapered recess in the bore of a pulley of such form
that a roller or rollers inserted therein becomes loose when the pulley is turned in
one direction, but grips or locks the pulley and the shaft together, when the pulley
is turned in the other direction, substantially as shewn and described.
2. A pulley or wheel having a tapered recess formed in its bore, into which a
pin or roller is inserted in such manner as to lock it to a shaft when it is turned in
one direction, but enables it to turn in the other direction without moving the shaft,
substantially as shewn and described.
3. A pulley or wheel having a tapered recess formed in its bore, and a similar
recess on the inside of a bush substantially as shewn and described with reference
to Fig. 4.
4. A pulley or wheel having a bush keyed inside its bore, and a tapered recess
formed in the bore of such bush substantially as described.
5. A pulley or wheel having a spring bush fitting inside its bore, such spring
bush having a tapered recess formed in its bore, substantially as shewn and described
with reference to Fig. 5.
6. A pulley or wheel having a double recess, or two recesses, formed in its bore

page_text: substantially in the manner and for the purpose shewn and described with reference
to Fig. 6.
Dated this 30th dose of Arenst 1905
W. H. MURCH,
Agent for the Applicants.