Improvements in Sheaves or Pulleys.
Year: 1890

page_text: Date of Application, 19th Aug., 1890
Complete Specification Left, 25th Oct., 1890-Accepted, 27th Dec.,
1890
PROVISIONAL SPECIFICATION.
[Communicated from abroad by FREDERICK B. WEST, of San Francisco, California,
United States of America.]
Improvements in Sheaves or Pulleys.
I, HENRY HARRIS LAKE, of the firm of Haseltine Lake & Co., Patent Agents
45 Southampton Buildings, in the County of Middlesex, do hereby declare the nature
of this invention to be as follows:-
This invention relates to sheaves or pulleys and is designed to improve the
construction and increase the efficiency of the same.
In carrying the said invention into practice the sheave or pulley is made in two
sections which are bolted or otherwise firmly secured together. The radial arms or
spokes of the said sheave or pulley are each provided at their outer ends with a
head or flange bevelled on its outer edges. The sections of the grooved rim are
provided on their inner edges with recesses the inner walls of which are bevelled
to receive the bevelled heads of the radial arms or spokes. The said spokes are
provided on one side with a projection or stop, so that when the grooved rim is
forced into place on the radial arms or spokes, the said rim will abut against the
said projection or stop and thus ensure the said rim being fixed centrally on the
said radial arms or spokes.
The grooved rim is secured to the radial arms or spokes by means of bolts passing
through the rim and through each of the bevelled heads.
The sheave or pulley is divided into sections through two of the said radial arms
or spokes which are provided with suitable bosses, projections or flanges by means
of which the two parts of the said sheave are firmly secured together.
Dated this 10th day of August 1890
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Sheaves or Pulleys.
I, HENRY HARRIS LAKE, of the firm of Haseltine Lake & Co., Patent Agents,
45 Southampton Buildings, in the County of Middlesex, 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 cable-sheaves or pulleys, and more
particularly to that class of sheave or pulley which is arranged in a horizontal
position when in operation, the several parts of the said invention being adapted
to be reversed and also removed when worn or broken and replaced by new parts
without deducting from or interfering with the usefulness of the other portions,
as will be hereinafter described.
The accompanying drawing shows how my said invention may be conveniently and
advantageously carried into practice.
Figure 1 is a plan view of my improved sheave complete.
Figure 2 represents a sectional view of a portion of one of the radial arms or
spokes with the cable-receiving rim secured thereto drawn to an enlarged scale.
Figure 3 is a top view of a portion of one of the radial arms and the groove-rim of
the sheave.

page_text: 4
Figure 4 is a transverse section taken on the line x x of Figure 2, looking towards
the circumference of the sheave and,
Figure 5 is a detail view in section of the cable receiving rim and spoke with
the flange or projection in the centre of the head of the spoke, and a groove in
the rim-section to take the flange.
In carrying my invention into practice the sheave A, is cast or otherwise formed
in two semi-circular sections B B, as better illustrated in Figure 1, each section or
division being provided on its straight or connecting side with two longitudinally
divided half-spokes or radial arms, and with a lateral flange on either side thereof,
which, when the sections have been connected, will form two spokes or radial arms,
similar in construction to the radial arms or spokes C hereinafter described. The
flanges of the half-spokes or arms are provided at suitable points in their length
with bosses provided with holes to receive the bolts a, which connect the two parts
of the wheel together.
The radial arms or spokes C, of which there are a number suitable to the size
of wheel, are each provided with four longitudinal ribs or flanges, which in cross-
section are cross shaped, as better illustrated at C in Figure 4, it being apparent
that this construction while light and neat of appearance, possesses the advantage
of strength and durability.
The outer end of the radial arms or spokes Care provided with heads E as
. illustrated, to form a seat for the reception of the grooved rim D, and upon each side
of these heads I form an outwardly directed flange or projection E¹ which forms a
support and alignment for the said grooved rim, and the two lateral edges of each
head are bevelled, as indicated at F, to take into the bevel recess of the peripheral
sections hereinafter described. In the intervals between the ribs or flanges in the
heads of the radial arms I form bolt-apertures to receive the bolts e, which connect
the said heads to the rim sections. The flange E¹ is either provided with a lip E* on the
underside of the head as shown in Figure 2 or the said head is provided in the centre
thereof with a projection Exx which fits into a corresponding groove in the rim of
the pulley as shown in Figure 5.
The grooved rim D is formed in segments which are of a curvilinear contour and
each section is of a length equal to the distance between the centres of two adjacent
spokes to which it is connected by the bolts e passing through apertures provided in
the flanges of the said segments and through the heads of the spokes.
Each of the segmental sections D is provided at its ends upon the inner side, with
a recess f, the inner wall of which is bevelled to receive the bevelled edge of the
spoke head and of the intermediate keys 9 whereby a secure and durable connection
g
is effected.
As thus constructed the strain on the bolts fastening the segments to the head of
the radial arms is very slight making it difficult to break or dislodge the bolts or
other portions, most of the strain being thrown upon the arms.
The projections or flanges to receive the keys 9 are bevelled inwards to form a sort
of dove-tail and at right angles to the grooved rim in such a manner that the form of
keying need not be altered by reversing them; the edges of the heads E of the radial
arms are also slightly bevelled so that the bevel keys may enter the dove-tailed key-
way and be easily tapped home with a slight blow from a hammer, and when in
position the keys will not be easily dislodged as the vibration or jar of the parts will
have a tendency to tighten them rather than otherwise. The grooved portion of the
rim is constructed as illustrated in Figure 2 the grooved being of a depth to suit the
diameter of the cable to be employed.
The central or hub portion of the sheave is reinforced or made heavy, as illustrated
in Figures 1 and 2 and is adapted to receive the shaft upon which it is mounted,
which may be driven by any suitable mechanism or motive power.
By the construction above described it will be seen that should one portion of the
groove or rim become worn, the worn peripheral section may be reversed, so that the
other wall of the groove will take the place of the worn wall, and it will also appear
that should any peripheral section become worn or broken it can be replaced by a

page_text: new section without disturbing or interfering with the usefulness of the remainder of
the sections of the pulley. It is also obvious that should one half of the pulley
become irreparably worn or damaged it may be removed and replaced by a new
section without removing or deducting from the usefulness of the other half.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, as communicated to me
by my foreign correspondent, I declare that what I claim is:-
First. In a cable sheave or pulley the two diametrical sections or halves provided
with two radial arms or spokes provided with heads upon their outer ends, the lateral
edges of which are bevelled, and the peripheral grooved segments provided upon their
inner sides with recesses, the inner walls of which are bevelled to receive the bevelled
heads of the radial arms and adapted to be secured thereto with or without keys, as
specified.
Second. A cable sheave or pulley having two sections adapted to be secured
together by bolts, the radial arms provided with heads at their outer ends the said
heads being provided with bevelled edges the outwardly directed flange or projection
and the grooved peripheral sections adapted to be secured to the spokes, and having
recesses upon their inner side the inner walls of which are bevelled to receive the key
or bevelled head of the spokes substantially as and for the purpose specified.
Third. In a sectional cable sheave, or pulley the combination of the spokes or arms
having heads E provided with projections or flanges E' with the segments D adapted
to fit upon and be supported by said flange and the fastening bolts e e as described,
and shown in the drawing.
Dated this 25th day of October 1800
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.