Improvements in Means or Apparatus for Transmitting Motion from one Rotary Shaft or Body to another Rotary Shaft or Body by Means of Belting.
Year: 1899

page_text: Date of Application, 30th Nov., 1899-Accepted, 13th Jan., 1900
COMPLETE SPECIFICATION.
Improvements in Means or Apparatus for Transmitting Motion from
one Rotary Shaft or Body to another Rotary Shaft or Body by
Means of Belting.
We, ARNOLD GOODWIN, of 56, Sumner Street, Southwark, in the County of
London, and ALFRED THOMAS BOOTH, of 32, Wendover Road, Harlesden, in the
County of Middlesex, 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:—
When transmitting motion from a driving shaft, as for example an engine
shaft, or a main driving shaft, to a second or driven shaft, as for example a
counter shaft, by means of a belt, it has heretofore been common to provide the
driving shaft with a fast pulley and the driven shaft with fast and loose pulleys
and to provide in connection with the belt passing around the pulleys, a belt
shifter by which the belt can be shifted laterally from the loose pulley to the
fast pulley on the driven shaft, or vice versa, according as it is desired to rotate
or stop the second shaft. This arrangement is open to many serious practical
disadvantages. When the second shaft is stopped, the belt still continues to
travel and the loose pulley to rotate, causing useless wear of the belt, loose pulley
and shaft and loss of lubricant and power, and should the second shaft form part
of a machine such for example as a wood sawing machine or a drilling machine,
in which the said shaft would be near the ground, the travelling belt may con-
stitute a source of danger. When link belting is used the transverse link con-
necting pins employed in such belting are subject to injurious bending action,
caused by passing from one pulley of given convexity of rim to
another pulley having a different convexity of rim, not only whilst
the second shaft and the machine it drives are in action, but also when they
are out of action, thus causing further unnecessary deterioration of the belt.
When the driving shaft of an engine is connected to the main driving shaft of
a factory by a belt passing over a fast pulley on each, and the main driving shaft
is connected to a large number of counter shafts by belts passing over fast pulleys
on the main shaft and loose pulleys on the countershafts, which is a very common
arrangement, a considerable and useless load is thrown on the engine which pre-
vents its being readily started, especially if the engine be a gas or like explosion
engine.
To obviate the above mentioned disadvantages, the pulley on the driving
shaft is sometimes made loose and a friction clutch is provided in connection
with it and the shaft, so that the pulley can be connected to or disconnected from
the driving shaft at will. As is well known however, the use of friction clutches
are also open to many practical objections. They and the pulleys with which
they act are subject to considerable wear; they are liable to fail to properly go

page_text: into action and come out of action and owing to the considerable endways pressure
necessary to put them into effective action, they are liable to seize and cause
damage. Moreover they usually cause considerable endways thrust on the shaft
to which they are applied which is liable to disturb the longitudinal position of
the shaft.
Now this invention has for object to provide simple means for transmitting
motion from one rotary shaft or body, (hereinafter called the driving shaft)
to another rotary shaft or body (hereinafter called the driven shaft) whereby the
disadvantages attending the use of arrangements such as hereinbefore mentioned
are completely obviated.
According thereto the, one shaft is driven from the other by means of a belt
that passes around a pulley fast on the driven shaft and around a pulley fast on a
sleeve that is mounted to rotate with but is capable of moving endways upon the
driving shaft and is provided with a loose pulley, adjacent to the fast pulley and
with means for moving the sleeve with the pulleys thereon endways upon the
shaft, the arrangement being such that when motion is to be transmitted from
one shaft to the other, the sleeve with fast and loose pulley is moved endways
in one direction transversely to the belt SO as to shift the loose
pulley from the belt and bring the fast one into position to carry
and drive the same, the sleeve with pulleys being moved in the opposite direc-
tion, so as to move the fast pulley out of the operative position and bring the
loose pulley into position to carry the belt when the second shaft is to be stopped,
at which time the said belt will also be stopped. Means such as a fork may,
when necessary, be provided to prevent lateral displacement of the belt by the
lateral displacement of the fast and loose pulleys.
.
Figs. 1 and 2 of the accompanying illustrative drawings are elevations at right
angles to each other showing means for transmitting motion from one shaft to
another according to this invention. Fig. 3 is a part side elevation and part
longitudinal section, showing to a larger scale than Figs. 1 and 2, the endways
movable sleeve with parts of the fast and loose pulleys thereon and the driving
shaft to which they are applied. Fig. 4 is an end view of the parts shown
in Fig. 3.
1 is the main or driving shaft, and 2 the second or driven shaft to which
power is to be transmitted from the first one. 3 is a sleeve mounted upon the
driving shaft and connected thereto by a feather 4 that is fixed to the shaft 1
and extends through a groove or keyway in the said sleeve so that the sleeve
is forced to rotate with the shaft but can be moved endways thereon.. 5 is a
pulley that is secured to the sleeve 3 by means of a key 6 and constitutes the
fast pulley. 7 is a second pulley of the same external diameter as the pulley 5.
It is mounted upon but not fixed to the sleeve 3 so that the sleeve can rotate
within its hub or nave when it is held stationary, such pulley constituting the
loose pulley. S is a pulley fixed upon the second or driven shaft 2. 9 is the
driving belt which always passes around the pulley 8 and also passes around the
fast pulley 5 or the loose pulley 7 according to the endways position of such
pulleys. 10 is a sleeve operating lever, one end of which is forked and works
in the annular groove 11 between the collar 3 on the sleeve 3 and the adjacent
side of the loose pulley 6 and the other end of which is connected to any suitable
means, such as a rod 12, adapted to be worked by hand or otherwise, as may be
desired, for shifting the sleeve 3 with pulleys 5 and 7 endways on the driving
shaft 1. 13 is a stop, shown as a fork, for preventing lateral movement of the
belt 9 by lateral movement of the pulleys 5 and 7.
With the arrangement shown and described it will be understood that when
the sleeve 3 with pulleys 5 and 7 is moved endways, in the direction of the
arrow Fig. 1. so as to transfer the belt 9 from the fast pulley 5 to the loose
pulley, the belt with pulleys 7 and 8 and the shaft 2 will all be brought to
rest, thus obviating in a simple way the disadvantageous inherent to the previously
known arrangements hereinbefore referred to.

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. Driving one shaft or body from another shaft or body by means of a
belt that passes over a pulley fast on the first mentioned shaft or body and also
over a pulley fast on a sleeve that is mounted to rotate with but is capable of
moving endways upon the secondly mentioned shaft or body and is also pro-
vided with a loose pulley adjacent to the fast one, and with means for moving
it and the fast and loose pulleys thereon transversely to the belt, substantially
as described.
2. The combination with a driving shaft and a driven shaft, of a sleeve mounted
to rotate with but capable of moving endways upon the driving shaft, adjacent
fast and loose pulleys carried by the sleeve, means for moving the sleeve endways
upon the driving shaft, a pulley fast on the driven shaft, and a belt passing
around the last mentioned pulley and around the fast or loose pulley on the sleeve
substantially as herein described.
3. The improved means or apparatus for transmitting motion from one shaft
to another constructed, arranged and operating, substantially as hereinbefore
described with reference to and shown in the drawings annexed.
Dated this 30th day of November 1899.
Dated this 30th day of November 1899.
For the Applicants,
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C., Chartered Patent Agent.