Improvements in the Construction and Arrangement of Band Pulleys.
Year: 1886

page_text: Date of Application, 11th Oct., 1886.
Complete Left, 11th July, 1887.
Complete Accepted, 12th Aug., 1887.
PROVISIONAL SPECIFICATION.
Improvements in the Construction and Arrangement of
Band Pulleys.
1, ALFRED THOMAS BOOTH, of Whitmore Saw Mills, Hoxton, in the County of
Middlesex, Engineer, do hereby declare the nature of this invention to be as follows:-
This invention has reference to a simple and efficient construction and arrangement
of what are known as fast and loose pulleys. Heretofore it has been usual to fix the
fast pulley upon a shaft, the loose pulley being freely mounted upon the same shaft so
as to be able to rotate independently thereof, and the band or belt has been shifted
laterally from one to the other according as the shaft has been required to be rotated
(or to communicate rotary motion through the band or helt to some other shaft) or
not. Thus where motion has had to be communicated by band or belt from one shaft
to another, with provision for arresting the motion of the driven shaft without stopping
the driving shaft, it has been usual to employ on the latter a broad wheel or pulley,
whereas by my invention a wheel or pulley the width of the band or belt or thereabout
will suffice, as it is not needful to shift the band or belt laterally.
According to my invention the fast pulley, which may be in one or two parts, is
made movable lengthwise upon the shaft upon which the loose pulley is mounted, and
the arrangement is such that, by shifting the fast pulley, its rim can be caused to
overlap the rim of the loose pulley, entering between it and the band or belt. When
the fast pulley is in two parts, they may be connected so as to be caused to approach
one another simultaneously over the periphery of the loose pulley. To facilitate the
engagement of the fast pulley with the band or belt, its edge may be bevelled, and be
formed with a slight lateral projection or projections such as will readily enter between
the band or belt and the periphery of the loose pulley. Where a single fast pulley is
used a stop of any suitable kind can be provided to prevent lateral displacement of
the band or belt.
A
•
1
1002
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C.,
Agent for the Applicant.

page_text: Improvements in the Construction and Arrangement of
Band Pulleys.
I, ALFRED THOMAS BOOTH, of Whitmore Saw Mills, Hoxton, in the County of
Middlesex, 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:-
This invention has reference to a simple and efficient construction and arrangement
of what are known as fast and loose pulleys. Heretofore it has been usual to fix the
fast pulley upon a shaft, the loose pulley being freely mounted upon the same shaft so
as to be able to rotate independently thereof, and the band or belt has been shifted
laterally from one to the other according as the shaft has been required to be rotated
(or to communicate rotary motion through the band or belt to some other shaft) or
not. Thus where motion has had to be communicated by band or belt from one shaft
to another with provision for arresting the motion of the driven shaft without stopping
the driving shaft, it has been usual to employ on the latter a broad wheel or pulley,
whereas by my invention a wheel or pulley the width of the band or belt, or there-
about, will suffice, as it is not needful to shift the band or belt laterally.
According to my invention, the last pulley, which may be in one or two parts, is
made movable lengthwise on the shaft upon which the loose pulley is mounted, and
the arrangement is such that, by shifting the fast pulley, its rim can be caused to
overlap the rim of the loose pulley, entering between it and the band or belt. When
the fast pulley is in two parts, they may be connected so as to be caused to approach
one another simultaneously over the periphery of the loose pulley. To facilitate the
engagement of the fast pulley with the band or belt, its edge may be bevelled and be
formed with a slight lateral projection or projections such as will readily enter between
the band or belt and the periphery of the loose pulley. Where a single fast pulley is
used, a stop of any suitable kind can be provided to prevent lateral displacement of
the band or belt when being thrown in or out of engagement with the fast pulley.
Referring to the accompanying two sheets of drawings,
Fig. 1 shows partly in elevation and partly in vertical section one arrangement of
fast and loose band pulleys according to this invention.
Fig. 2 is a similar view illustrating another arrangement in which the fast pulley is
in two parts.
In Fig. 1, 1 is the shaft to be driven from another shaft or rotary body by the band
or belt 2, or it may be the shaft from which power is to be transmitted. 3 is a fast
pulley secured to the shaft 1 so as to rotate therewith, by means of a feather 4, but so
nevertheless as to be capable of being caused to move longitudinally of the shaft by
means of a suitable device such as a forked lever 5 that takes into a groove or recess C
in the boss of the pulley. 7 is a loose pulley mounted on the shaft I so as to be able
to rotate freely thereon between collars 8, 8. 9 is a band fork or guide suitably

page_text: secured, it may be to the floor; it is arranged to embrace the band or belt, and
prevent lateral motion thereof when the fast pulley is moved away from the loose
pulley.
To arrest the transmission of power to or from the shaft 1, as the case may be, the
fast pulley 3 is moved longitudinally of the shaft by the lever 5 so as to be clear of
the loose pulley 7. The band 2 will then run idly upon the loose pulley 7, the guide
or fork 9 preventing it moving laterally during the longitudinal movement of the
fast pulley.
To transmit power to or from the shaft 1, the pulley 3 must be moved forward so
that its rim shall enter between the band and the outer circumference of the loose
pulley 7, thus causing the band to run on to the pulley 3. To facilitate this entrance
of the rim of pulley 3 between the band and pulley 7, it is bevelled as shown, and may
be provided with projections 3*. In Fig. 2, the fast pulley is made in two parts that
can be caused to simultaneously move towards or recede from each other according as
it is desired to transinit motion to or from the shaft 1, or not. To enable these
movements to be effected, the boss of each part of the fast pulley is grooved or
recessed, and provided with a lever 5, the two levers being hinged or jointed at 10.
11 is a rod provided with right and left-handed screw-threaded portions that take into
correspondingly screw-threaded nuts 12, one of which is pivotted at 13 to each of the
levers 5; it is provided with a wheel 14 that may be actuated by hand when
convenient, or by other suitable means. In the example shown in the drawings, it is
actuated by a rope or belt 15. Two bands 2 are shown in this arrangement.
The operation of this modified arrangement for transmitting motion to or from the
shaft, or stopping such transmission, will be readily understood without further
description.
Having now particularly described and ascertained the nature of the said invention,
and in what manner it is to he performed, I declare that what I claim is :-
*
33
1. A fast pulley adapted to be capable of movement along a shaft and of entry
between a band or belt and the periphery of a loose pulley, so as to receive the said
band or belt from such loose pulley, and transmit motion to or from the shaft, or of
being moved from between said band or belt and the loose pulley when transmission
of power is to cease, substantially as described.
2. A pulley such as referred to in the preceding Claim constructed in two parts that
can be caused to approach or recede from one another according as such pulley is
required to take up or release a band or belt or bands or belts, substantially in the
manner hereinabove described for the purpose specified.
3. Fast and loose pulleys constructed, applied, and arranged upon a shaft as
hereinabove described with reference respectively to and shown in Fig. 1 and in
Fig. 2 of the drawings annexed.