Friction Pulleys for Transmitting Power.
Year: 1897

page_text: PROVISIONAL SPECIFICATION.
Friction Pulleys for Transmitting Power.
JOHN EMMETT LAWRENCE, 80, Langton Terrace, Poole, Dorset, Engineer, do
hereby declare the nature of this invention to be as follows:-
To transmit motion and power without, noise from one shaft to another by
friction pulleys in rolling contact having V grooves round their circumference,
each of the grooves in the larger pully is fitted circumferentially with an endless
rope or ring of hemp, half of the rope is secured in its groove and the other half
of rope projects past the groove, into the groove of the small pulley, thereby
transmitting the power and motion by frictional contact with the inclined sides
of groove. The grooves are divided in the centre so that in the large pully the
ropes can be put on, also adjusted or removed, likewise each groove in the small
pulley can be so regulated as to compensate for the wear.
By this invention the pressure between the rolling surfaces in contact is reduced,
also resistance to slipping and diminished wear on the bearings.
Dahi nih di of Datahan 1807
JOHN EMMETT LAWRENCE.
I, JOHN EMMETT LAWRENCE, of 80, Langton Terrace, Poole, in the County of
Dorset, 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:.
My invention relates to friction pulleys for transmitting power from one shaft
to another and has for its object to provide for a good contact between the
surfaces with less pressure than heretofore whereby the grinding and wear and
tear of the bearings are considerably reduced.
According to my invention the pulleys themselves are not in actual contact
but each of them is formed with a circumferential groove or with two or more
of such grooves into which, or each of which on one of the wheels a hoop or ring
of hemp, rope or other suitable material having high frictional capacity is inserted
in such a manner as to form the desired connection between the wheels. In
practice the wheels are so formed that one side of each groove can be removed
to permit of inserting or removing the hoop or ring and of adjusting the contact
surface in case of wear.

page_text: To enable my invention to be fully understood I will describe the same by
reference to the accompanying drawing, in which:-
-
Figure 1 is an elevation of two wheels arranged with frictional surfaces accord-
ing to my invention, each wheel being provided with two grooves; and,
Figure 2 is a central section of the same:
Figure 3 is a sectional view drawn to a larger scale than Figures 1 and 2
illustrating the arrangement for adjusting the frictional hoops or rings.
a, b are two wheels which are to run together the former of which is provided
with two grooves c, c and the latter with two corresponding grooves d d the
said grooves each having the outer flange or lip e made separate from the wheel
so as to permit of the said flanges being removed; these flanges as shewn are
secured by the bolts f, f..
1
9, 9 are the hoops or rings formed of ropes of hemp or other suitable material,
which hoops or rings are shewn in Figure 1 as being located in the grooves c, c
of the wheel a, although, if desired, they may be inserted in the grooves of the
wheel b. In practice, however, it is preferable that the said hoops should be in
the wheel of larger diameter as a greater amount of frictional surface is thus
obtained than in the wheel of smaller diameter. These hoops or rings are inserted
in the wheel grooves in such a manner that they project for about half their
diameter so as to enter the grooves of the adjacent wheel as will be readily under-
stood by reference to Figure 3.
In assembling the parts when placing the rings in the grooves it is advisable
that a series of thin washers or packing pieces should be arranged between the
flanges c, e and the body of the wheel so that as the surfaces of the hoop or ring
become worn one or more of such packing rings may be removed to permit of
narrowing the grooves and so increasing the frictional contact between the grooves
and the hoop or ring.
It will be obvious that the fly wheel of an engine may be adapted to serve as one
of a pair of friction wheels if so desired.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is:
1. Friction pulleys for transmitting power the surfaces of which are circum-
ferentially grooved the groove or grooves in one wheel having inserted into it or
them a hoop or ring or hoops or rings of hemp or other suitable frictional material
which projects or project into the groove or grooves of the other wheel, substantially
as described.
2. In friction pulleys for transmitting power circumferentially grooved and
having a hoop or ring of hemp or other suitable frictional material inserted into
the groove or each groove of one wheel and projecting into the corresponding
groove or grooves of the adjacent wheel forming the said wheels with adjustable
flanges so as to compensate for wear, substantially as described.
3. Friction pulleys for transmitting power having the frictional surfaces con-
structed and arranged substantially in the manner herein before described and
illustrated in the accompanying drawing.
Dated the 20th day of August 1898.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London,
Agents for the Applicant.