An Improved Variable Band Pulley.
Year: 1891

page_text: Date of Application, 24th June, 1891
Complete Specification Left, 19th Mar., 1892-Accepted, 23rd Apr., 1892
PROVISIONAL SPECIFICATION.
An Improved Variable Band Pulley.
I THOMAS WILSON of Clegg Hall Mill, Smithy Bridge near Rochdale in the
County of Lancaster Cotton Waste Spinner do hereby declare the nature of this
invention to be as follows:
This invention relates principally to the construction of an improved band pulley
intended to replace the cone pulleys usually employed to produce variable speed in
slubbing, intermediate and roving frames used in the preparation of cotton or other
fibrous materials for spinning, but it is also applicable to other machines where a
band pulley capable of driving at variable speeds is required.
I make the pulley in two parts one of which is keyed fast upon, the axle and the
other so mounted as to be capable of sliding thereon. Each part is made with a
portion cylindrical and a portion coned to forty five degrees or thereabouts.
These two coned portions are opposite to each other so that when the two are
placed together they form a band pulley with a V-shaped groove.
!
Each half of the pulley is made with alternate projections and recesses (some-
what like the teeth and spaces of a bevil wheel but deeper) so that the projections
of one being opposite to the recesses in the other they interlock and can be forced
more or less into each other.
The result of this method of construction is that when the movable half of the
band pulley is placed with its projections only a slight distance into the recesses of
the fixed portion, the point where the two cones cut each other forms the bottom
of the V-groove in which the band works, and the pulley is then at its smallest
diameter, but as the movable half of the pulley is forced further home the diameter
of the groove of the pulley is proportionately increased in size and thus a 'variable
speed may be obtained.
The movable half of the pulley is made with a grooved boss or collar and is
moved to and fro by means of a forked lever which is actuated in any convenient
manner so as to produce the variation of speed required.
Detod this 23rd day of June 1891
GEO. DAVIES & SON,
4, St. Ann's Square, Manchester, Agents for the Applicant.
COMPLETE SPECIFICATION.
An Improved Variable Band Pulley.
I THOMAS WILSON of Clegg Hall Mill, Smithy Bridge near Rochdale in the
County of Lancaster Cotton Waste Spinner, 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 principally to the construction of an improved band pulley
intended to replace the cone pulleys usually employed to produce variable speed in
slubbing, intermediate and roving frames used in the preparation of cotton or other
fibrous materials for spinning, but it is also applicable to other machines where a
band pulley capable of driving at variable speeds is required.
The nature of my said invention and the manner in which the same is to be
performed or carried into practical effect will be readily understood on reference
to the sheet of drawings hereunto annexed and the following explanation thereof.
Fig. 1 on the drawing is an external elevation of my improved variable band
pulley.

page_text: Fig. 2 is a longitudinal section of the same and
Fig. 3 is a face view of one of the two sections or parts of which it is composed.
I make the pulley in two parts a and one of which'a is keyed fast upon the
axle cand the other-b so mounted as to be capable. of sliding thereon! Each part
is made with a portion cylindrical externally and a portion coned to an angle of
forty five degrees or thereabouts.
These two coned portions are opposite to each other so that when the two are
placed together they form a band pulley with a V-shaped groove as shown at
Fig. 1.
Each half of the pulley is made with alternate projections d and recesses e
(somewhat like the teeth and spaces of a bevil wheel but deeper see Figs. 1 and 2)
so that the projections d of one being opposite to the recesses e in the other they
interlock and can be forced more or less into each other (see Fig. 2)..
The result of this method of construction is that when the movable half of the
band pulley is placed with its projections only a slight distance into the recesses of
the fixed portion a see Fig. 1 the point where the two cones cut each other forms
the bottom of the V-groove in which the band works, and the pulley is then at
its smallest diameter, but as the movable half of the pulley is forced further
home the diameter of the groove of the pulley is proportionately increased in size
(see Fig. 2) and thus a variable speed may be obtained.
The movable half of the pulley is made with a grooved boss or collar and is
moved to and fro by means of a forked lever which is actuated in any convenient
manner so as to produce the variation of speed required.
Having now particularly described and ascertained the nature of my said inven
tion and the manner in which the same is to be performed I declare that 'what I
claim is
The improved variable band pulley formed with two interlocking, conical
portions substantially as hereinbefore described and illustrated by the drawings
annexed.
Dated this 18th day of June 1892.
GEO. DAVIES & SON;
4, St. Ann's Square, Manchester, Agents for the Applicant.