Improvements in Sheaves for Pulley Blocks.
Year: 1889

page_text: Date of Application, 25th Feb., 1889
Complete Specification Left, 15th Oct., 1889-Accepted, 16th Nov.. 1889
PROVISIONAL SPECIFICATION.
Improvements in Sheaves for Pulley Blocks.
We, HOWELL PEARSHAL TERRY, of 647, Leonard Street, Brooklyn, in the County
of Kings, and State of New York, United States of America, Master Mariner, and
GEORGE WILLIAM BLAIR, of 320, Baltic Street, Brooklyn aforesaid, and of 28, South
Street, in the City, County, and State of New York, United States of America,
Commission Merchant, do hereby declare the nature of this invention to be as
follows:-
This Invention relates to an improvement in the mounting of pulley block sheaves;
the object of the invention being to reduce friction and enable the sheave to be
readily repaired should it by any accident happen to get out of order.
The Invention consists essentially of a sheave constituted by an annular rim with
series of anti-friction wheels or rollers interposed between the said rim and the axis of
the sheave, said rollers bearing against the inner face of the rim and against the axis
and their own axes being mounted in a pair of rings one at each side of the anti-
friction wheels or rolls. The rim is internally channelled to form a path in which
the anti-friction rollers run. These rollers are preferably arranged in two series so
that they overlap and together make a more continuous bearing for the rim of the
sheave.
By supporting the roller axes by rings arranged outside of both sets of wheels and
by overlapping said wheels, we provide for the use of much larger wheels than could
otherwise be employed and at the same time we provide for the renewal of any wheel
that might happen to be broken.
'
COMPLETE SPECIFICATION.
Improvements in Sheaves for Pulley Blocks.
We, HOWELL PEARSHAL TERRY, of 647, Leonard Street, Brooklyn, in the County
of Kings, and State of New York, United States of America, Master Mariner, and
GEORGE WILLIAM BLAIR, of 320, Baltic Street, Brooklyn, aforesaid, and of 28, South
Street, in the City, County, and State of New York, United States of America,
Commission Merchant, 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 to an improvement in the mounting of pulley block sheaves;
the object of the invention being to reduce friction and enable the sheave to be readily
repaired, should it by any accident happen to get out of order.
The Invention consists essentially of a sheave constituted by an annular rim with
series of anti-friction wheels or rollers interposed between the said rim and the axis of
the sheave, said rollers bearing against the inner face of the rim and against the axis,
and their own axes being mounted in a pair of rings one at each side of the anti-
friction wheels or rolls.
Reference is to be had to the accompanying drawings forming part of this specifi-
cation, in which figure 1 is a side view of our improved sheave for pulley blocks, part
being broken away and the axis of the sheave being shewn in section; and figure 2 is
a sectional view on line - figure 1, the view being taken from the direction of

page_text: the arrow shewn. Similar figures and letters of reference indicate corresponding
parts in both views.
In the drawings, 10 represents a rim formed with an inner annular recess 11 and
preferably with a grooved peripheral face a. Within the rim 10 we mount a number
of anti-friction rolls or wheels 14 which are carried by pins 13 mounted in rings 12
arranged outside of the wheels or rolls 14. The wheels or rolls 14 are so pro-
portioned that they will bear closely against the inner peripheral face of the rim 10
and against the axis 20 of the block."
In the specific construction illustrated in the drawings, there are six of these anti-
friction rolls or wheels, three being arranged adjacent to one of the rings 12 and three
adjacent to the other ring, the wheels overlapping and breaking joints so to speak,
that is being alternately adjacent to opposite sides of the sheave.
After the parts have been adjusted as represented in the drawings, the side flanges b
of the rim 10 will act as guides to steady the wheels 14.
By supporting the pins 13 by means of rings arranged outside of both sets of wheels
and by overlapping said wheels, we provide for the use of much larger wheels than
could otherwise be employed and at the same time we provide for the renewal of any
wheel that might happen to be broken.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is;
1. The combination, with a surrounding rim, of anti-friction rolls or wheels bearing
upon the inner peripheral face thereof, pins upon which the wheels or rolls are
mounted, and rings by which the pins are supported said rings being arranged outside
of the rolls or wheels, substantially as described.
2. The combination, with a rim formed with an internal annular recess,
of over-
lapping anti-friction rolls or wheels arranged to bear against the inner peripheral
face of the rim and, within its annular recess, pins upon which the anti-friction
rolls or wheels are mounted, and rings which support the pins, substantially as
described.
3. The combination, with a rim formed with an internal annular recess, of pin-
supporting rings and alternately arranged anti-friction rolls carried by said pins and
arranged to hear against the inner peripheral face of the rim, substantially as
described.
Dotad This 144h dow of Databon 1998
Dotad this 145
Natobon 1920
H. P. TERRY.
G. W. BLAIR.
By A. M. & Wm. Clark,
53, Chancery Lane, London, Patent Agents.