Improvements in Pulleys employed in Driving Machinery by Belts.
Year: 1893

page_text: Date of Application, 22nd Feb., 1893
Complete Specification Left, 17th Nov., 1893-Accepted, 23rd Dec., 1893
PROVISIONAL SPECIFICATION.
Improvements in Pulleys employed in Driving Machinery by Belts.
We, RICHARD BICKERDIKE, ALBERT BICKERDIKE and JOHN ROBERT
BICKERDIKE, all of 3 Elvey Street, Newton Heath, Manchester, in the County of
Lancaster, Engineers, do hereby declare the nature of this invention to be as
follows:-
may
Our invention relates particularly to pulleys with a metal face but it be
applied to other pulleys such as those with a wooden face and the object of our
improvements is to guide the belt so that it will naturally tend to run on the face of
the pulley and avoid running off at either edge.
To effect this purpose we cut or form in any convenient manner a V or other
screw thread in both directions across the face of the pulley the threads crossing
one another.
A loose covering prepared as described might be affixed to ordinary pulleys of
any construction and attached thereto in a single piece or in any convenient number
of pieces.
:
Pulleys with sheet metal rims could have right and left hand grooves formed by
a corrugating, stamping, or equivalent process, and in pulleys made of cast metal it
might be practicable to cast right and left hand grooves or ridges on the face of
the pulleys.
Dated this 21st day of February 1893
H. B. BARLOW & GILLETT,
Agents for Applicants.
COMPLETE SPECIFICATION.
Improvements in Pulleys employed in Driving Machinery by Belts.
We, RICHARD BICKERDIKE, ALBERT BICKERDIKE and JOHN ROBERT
BICKERDIKE, all of 3 Elvey Street, Newton Heath, Manchester, in the County of
Lancaster, 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 :-
Our invention relates particularly to pulleys with a metal face but it may be
applied to other pulleys such as those with a wooden face and the object of our
improvements is to guide the belt so that it will naturally tend to run on the face of
the pulley and avoid running off at either edge.
To effect this purpose we cut or form in any convenient manner a V or other
screw thread in both directions across the face of the pulley the threads crossing
one another.
And in order that our invention may be fully understood and readily carried into
effect we will describe the accompanying sheet of drawings reference being had to
the figures and letters marked thereon.
Fig. 1 is an elevation, partly in section, of our improved pulley employed for
driving machinery by a belt, and
Fig. 2 is an elevation of a pulley, of slightly modified construction also made
according to our invention.
With driving pulleys of the ordinary construction it frequently happens that the
belts have a tendency to run off the pulley more at one side than the other, and to
remedy this difficulty various means are adopted, one of the commonest being to
crown the face of the pulley so much as to unduly stretch and injure the belt.
"
'

page_text: In Fig. 1 of the drawings the pulley is marked a and on the face of the pulley
are cut two V threads 6 of equal pitch one running across the pulley from right to
left, and the other across the pulley from left to right; when a
driving belt is
running over such a prepared pulley the tendency of the screw threads is to make
the belt grip the face of the pulley, and at the same time the belt is drawn
toward the centre of the pulley and prevented from running off the edge at
either side.
:
•
In Fig. 2 a right and left hand thread is cut on the face of the pulley, each
thread being started from the centre of the pulley and carried respectively to the
right hand and left hand edge of the pulley face, so as to cause the belt to run on
the centre of the pulley.
A loose covering prepared as described might be affixed to ordinary pulleys of
any construction and attached thereto in a single piece or in any convenient number
of pieces.
Pulleys with sheet metal rims could have right and left hand grooves formed by
a corrugating, stamping, or equivalent process and in pulleys made of cast metal it
might be practicable to cast right and left hand grooves or ridges on the face of
the pulleys.
Having now particularly described and ascertained the nature of our said inveu-
tion and in what manner the same is to be performed we declare that what we
claim is :―
In a pulley employed for driving machinery by a belt-
1. The application of right and left hand V, or other threads, cut or otherwise
produced on the face of the pulley, substantially as illustrated and described in the
accompanying Specification.
2. A driving pulley the face of which is made of sheet metal with right and left
hand grooves produced by a corrugating, stamping or other suitable process as and
for the purposes described.
Dated this 16th day of November 1893
H. B. BARLOW & GILLETT,
17, St. Ann's Square, Manchester, Agents for Applicants.