IMPROVEMENTS IN AND APPLICABLE TO PULLEYS OR DRUMS FOR TRANSMITTING MOTION BY STRAPS OR BELTS."
Year: 1874

page_text: LETTERS PATENT to Robert Stone, of Liverpool, in the County of
Lancaster, for the Invention of "IMPROVEMENTS IN AND APPLICABLE TO
PULLEYS OR DRUMS FOR TRANSMITTING MOTION BY STRAPS OR BELTS."
PROVISIONAL SPECIFICATION left by the said Robert Stone at the
Office of the Commissioners of Patents, with his Petition, on the
4th March 1874.
I, ROBERT STONE, of Liverpool, in the County of Lancaster, do hereby
declare the nature of the said Invention for "IMPROVEMENTS IN AND APPLI-
CABLE TO PULLEYS OR DRUMS FOR TRANSMITTING MOTION BY STRAPS OR BELTS,"
to be as follows:-
This Invention relates to certain improvements in strap or belt pulleys
or drums used for transmitting motion to machinery or shafting, and has
for its object the overcoming or reduction to a minimum of the slip con-
Bequent upon machinery being driven by the aid of straps or belts.
In constructing pulleys or drums according to this Invention I form
dovetailed grooves or slots across the periphery or driving edges of the

page_text: pulley or drum. These dovetailed grooves or slots I fill in with lead or
other similar metal or material that will not take a polish, but remain
dull and bighting, and then bring the surface down level with the peri-
phery of the pulley; or the same object may be arrived at by piercing
the outer rim of the pulley or drum with taper holes, either of a square,
round, triangular, diamond, or other shape, and then filling the holes in
with lead or other material as before mentioned, and bringing the surface
level with the outer rim of the pulley or drum.
The general practice of overcoming slip in driving belts with pulleys
is by the application of powdered rosin, but when pulleys or drums
become much polished this system is comparatively useless. Now by
the fitting in of lead strips, as herein-before described, all slip is over-
come, and the belt or strap always has a bighting hold upon the pulley
or drum without detrimentally affecting the strap or belt.
A modified arrangement of this Invention for improvements in pulleys
and drums may consist in forming the grooves or slots and filling in of
lead round the circumference of the pulley or drum, or fitting a thin
sheet of lead round the outer rim of the pulley or drum, but this
application will not be as effective as the intermittent inlayed cross
strips of lead.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Robert Stone in the Great Seal Patont Office
on the 2nd September 1874.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, ROBERT
STONE, of Liverpool, in the County of Lancaster, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Fourth day of March, in the year
of our Lord One thousand eight hundred and seventy-four, in the
thirty-seventh year of Her reign, did, for Herself, Her heirs and
successors, give and grant unto me, the said Robert Stone, Her
special licence that I, the said Robert Stonec, my executors, admi-
nistrators, and assigns, or such others as I, the said Robert Stone,
my executors, administrators, and assigns, should at any time agree
with, and no others, from time to time and at all times there-

page_text: after during the term therein expressed, should and lawfully might
make, use, exercise, and vend, within the United Kingdom of Great
Britain and Ireland, the Channel Islands, and Isle of Man, an
Invention for "IMPROVEMENTS IN AND APPLICABLE TO PULLEYS OR DRUMS
B FOR TRANSMITTING MOTION BY STRAPS OR BELTS," upon the condition
(amongst others) that I, the said Robert Stone, my executors or
administrators, by an instrument in writing under my, or their,
or one of their hands and seals, should particularly describe and
ascertain the nature of the said Invention, and in what manner the
same was to be performed, and cause the same to be filed in the
Great Seal Patent Office within six calendar months next and imme-
diately after the date of the said Letters Patent.
NOW KNOW YE, that I, the said Robert Stone, do hereby declare the
nature of my said 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 to certain improvements in strap or belt pulleys
or drums used for transmitting motion to machinery or shafting, and has
for its object the overcoming or reduction to a minimum of the slip con-
sequent upon machinery being driven by the aid of straps or belts.
In constructing pulleys or drums according to this Invention I form.
dovetailed grooves or slots across the periphery or driving edges of the
pulley or drum. These dovetailed grooves or slots I fill in with lead or
other similar metal or material that will not take a polish, but remain
dull or bighting, and then bring the surface down level with the peri-
phery of the pulley; or the same object may be arrived at by piercing
the outer rim of the pulley or drum with taper holes, either of a square,
round, triangular, diamond, or other shape, and then filling the holes in
with lead or other material as before mentioned, and bringing the surface:
lovel with the outer rim of the pulley or drum.
The general practice of overcoming slip in driving belts with pulleys
is by the application of powdered rosin, but when pulleys or drums
become much polished this system is comparatively useless. Now by
the fitting in of lead strips, as herein-before described, all slip is over-
come, and the belt or strap always has a bighting hold upon the pulley
or drum without detrimentally affecting the strap or belt.
ر

page_text: A modified arrangement of this Invention for improvements in pulleys
and drums may consist in forming the grooves or slots and filling in of
lead all round the circumference of the pulley or drum, or fitting a thin
sheet of lead round the outer rim of the pulley or drum.
The annexed Sheet of Drawings shows portions of pulleys or drums 5
constructed according to my Invention. Like letters in the Drawings,
denote similar parts.
A is the metal of the pulley or drum; and B, lead, india-rubber, or '
other similar metal or material that will not take a polish, but remain
dull and bighting.
Figure 1 shows lead or other metal or material B dovetailed into
pulley or drum A.
Figures 2 and 3 show lead or other similar metal or material B
running in strips across the pulley or drum.
:
1
Figure 4 shows lead or other similar metal or material running in 1
grooves or slots all round the circumference of the pulley or drum.
Figures 5 and 6 show lead or other similar material inserted into the
pulley or drum in a diamond shape.
Figure 7 shows the lead or other similar metal or material inserted
into the pulley or drum in a circular shape.
Figure 8 shows the lead or other similar metal or material extending
entirely over the surface of the pulley or drum.
Figure 9 shows the lead or other similar metal or material extending
over nearly all the surface of the pulley or drum.
Figure 10 shows a section of a pulley or drum of a round form to 2
take a rope, to which pulley lead or other similar metal or material may.
be applied, as herein-before described, for plain pulleys or drums, as will
be understood.
Figure 11 shows a section of a V pulley or drum to which lead or other
similar metal or material may be applied, as herein-before described, for 8
plain pulleys or drums.
Having now described and ascertained the nature, object, and purposes.
of this my Invention, and shown how the same may be put into practical.

page_text: effect, I would have it understood that I do not confine myself to any
particular method of applying lead or other similar metal or material to
pulleys or drums, as there are many and various ways of applying the
same, namely, in cross grooves, or grooves all round the pulley, or in
diamond grooves, square grooves, round, triangular, or other shaped
grooves, such grooves being filled in with lead or other similar metal or
material, as will be understood, or the same may be fitted in a thin sheet
all round the outer rim of the pulley or drum; nor do I confine myself
to the particular style of pulley or drum to which my Invention may be
applied, as my Invention is applicable to all descriptions of pulleys and
drums, whether with plain surfaces, concave surfaces, convex surfaces,
V shaped surfaces, or otherwise; but what I claim as my Invention and
secured to me by Letters Patent as aforesaid is, the application of lead,
india-rubber, or other similar metal or material that will not take a
polish, but remain dull and bighting, to pulleys or drums for trans-
mitting motion to machinery or shafting, and thereby preventing slip in
driving belts, ropes, or wires, substantially in the manner as herein-
before described and set forth in the before-going Specification and
Drawings.
In witness whereof. I. the sc'd Robert Stone have hereunto set my