Improvements in Sheaves or Pulleys for Ships' Blocks, and for other purposes.
Year: 1896

page_text: PROVISIONAL SPECIFICATION.
Improvements in Sheaves or Pulleys for Ships' Blocks, and for other
purposes.
I, ROBERT BARCLAY URY HENERKEY JOHN DUNCAN of 17 Mecklenburg
Street, Leicester, Shipbuilder, do hereby declare the nature of this invention to be
as follows:-
This invention relates to improvements in sheaves or pulleys for ships' blocks
and for other purposes and is designed to remedy or obviate the wear, consequent
upon the movement of the sheave or pulley upon the pin or axle upon which it is
carried, caused by the action of the wind upon the sails and running gear, the
result being that the said pin or axle soon becomes worn and the free movement of
the sheave or pulley thereby impeded.
The invention consists in forming the sheave or pulley in parts, comprising a
dise, annular ring, and a number of rollers.
The disc is formed to surround the pin or axle upon which it may run loosely,
the periphery of the former being recessed to receive the rollers before mentioned.
The annular ring may surround the disc and he recessed on its inner face to also
receive the rollers, while its outer face or periphery may be recessed for the rope
to pass round.
It will consequently be seen that the rollers will run freely in the two recesses
mentioned, and therefore should the disc at any time be held by the pin or axle
the annular ring is still free to revolve.
The disc may be formed in halves to enable the rollers to be placed in the
recess, or in one piece, and the annular ring in halves for the said purpose.
Dond day of February 1896
W. P. THOMPSON & Co.,
31, High Holborn, London, W.C., Patent Agents for the Applicant.
Improvements in Sheaves or Pulleys for Ships' Blocks, and for other
purposes.
I, ROBERT BARCLAY URY HENERKEY JOHN DUNCAN of 6 Cedar Road,
(late of 17 Mecklenburgh Street,) Leicester, Marine Engineer and Shipbuilder,
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 improvements in sheave or pulley bearings for ships
blocks and for other purposes and is designed to remedy or obviate the wear
consequent upon the movement of the sheave or pulley upon the pin or axle by

page_text: which it is carried, caused by the action of the wind upon the sails or running
gear. In blocks as heretofore constructed the pin or axle upon which the pulley
is carried soon becomes worn and the free movement of the sheave or pulley
thereby impeded.
My invention is also applicable to other wheels than the pulleys in ships blocks,
such for example as the wheels of tram-cars, railway carriages and trucks and
portable engines.
According to my invention I form the sheave, pulley or wheel in parts, so
arranged that in the event of the hub or boss becoming impeded in its free move-
ment on the pin or axle owing to wear of the parts, the outer annular ring forming
the running part of the sheave, pulley, wheel, or the like will still be free to
revolve. For this purpose I provide a series of pulleys or rollers located between
the internal periphery of the annular ring and the external part of the hub or
boss, the said pulleys or rollers are free to revolve and materially reduce the
friction between the two parts of the pulley or wheel, which said parts are free to
revolve independently as hereinafter described.
In order that my invention may be clearly understood, I will now proceed to
describe the same with reference to the accompanying drawings, in which
Figure 1 is a side elevation of the wheel of a sheave or pulley.constructed in
accordance with my invention, and Figure 2 is a section on the line X. X.
Figure 1.
Figure 3 is a side elevation and Figure 4 a vertical section of a modification
of my invention applied to a tram-car or railway carriage wheel or the like.
Referring now to Figures 1 and 2 the hub or disc is formed in two parts A A¹,
the part A being reduced in diameter at A 2 for the purpose hereinafter
described.
The annular ring B is formed with a groove or recess B on its inner face, to
receive and partially enclose a number of pulleys or rollers C which are free to
revolve in the said groove or recess. The pulleys or rollers C are also partially
received into the recess A 2 formed in the hub or disc.being retained in position by
the plate A which is secured to the part A by the screws D. The hub or
disc AA and the running part B it will be seen, are free to revolve independently
of one another, their lateral movement being restricted by the pulleys or
rollers C.
It will be readily understood that the hub might be made in one piece having
the recess A:2 turned therein, the annular ring B being made in halves and secured
together in any convenient manner.
In the modification shown in Figures 3 and 4 the boss or hub is formed integrally
with the annular ring B'and the pulleys or rollers C are interposed between the
said 'boss or hub-and the enlarged part)E of the axle E. To enable the pulleys
or rollers C to be placed in position in the grooves or recesses Ex formed to receive
them, an opening is provided in the boss or hub and a portion G of the enlarged
part E of the axle is made removable as clearly shown in Figure 3. After
removal of the part G the pulleys or rollers C may be passed through the
opening F and slid along a groove F¹ into the recesses Ex before mentioned.
After all the pulleys or rollers Chave been placed in position the part G
is placed in the groove F¹ and secured in position by the screws G¹ and steady
peg G 2.
The opening F formed in the disc or hub is closed by inserting therein a
flanged block H which is retained in position by the screws H.2 passing through
the flange :H¹.
It will be understood that it is essential that the enlarged part E¹ of the
axle E must be slightly less in diameter than the inner face of the disc or hub
so that all the weight is borne by the pulleys or rollers C. As in Figures 1
and 2 the enlarged part E of the axle E and the hub of the annular ring B
are united laterally by the pulleys or rollers C but are free to revolve
independently..

page_text: I wish it also understood that I do not restrict myself to the precise details
herein shown and described, for instance balls may be substituted for the pulleys
or rollers or the latter lengthened and other modifications made without going
beyond the scope of my invention.
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. A pulley or wheel for ships blocks or other purposes formed in two parts
a hub or central portion surrounding the axle and an outer annular portion
separated from the central portion by pulleys or rollers located in grooves or
races in the said portions, for the purpose specified.
2. A pulley or wheel constructed substantially as described with reference to
Figures 1 and 2 of the accompanying drawings.
3. Wheels constructed substantially as described with reference to Figures 3
and 4 of the accompanying drawings.
Dated this 20th day of November 1896
ROBT. B. DUNCAN.
W. P. Thompson & Co.,
322, High Holborn, London, W.C., Patent Agents for the Applicant.