Improved Split Pulley.
Year: 1899

page_text: Date of Application, 5th Oct., 1899-Accepted, 11th Nov., 1899
HAHN, Wood-Turner, both of 183, Hereford Street, Christchurch, in the
Provincial District of Canterbury, in the Colony of New Zealand.]
Improved Split Pulley.
I, WILLIAM PHILLIPS THOMPSON, F.C.S., M.I.M.E., of the Agency for Foreign
Patent Solicitors, 322, High Holborn, in the County of Middlesex, 6, Lord Street,
Liverpool, and 6, Bank Street, Manchester, both in the County of Lancaster, and
Lower Temple Street, Birmingham, in the County of Warwick, Civil 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:―
This invention relates to pulleys designed for employment upon shafting which
carries other pulleys, or for other reason offers difficulties to getting a pulley
into required position.
In my invention the pulley is divided into two separate pieces the line of
division of the parts being of a curved shape and extending diametrically across
the pulley.
The division is formed so that the parts can only be put together by sliding
one part within the other, the curves of one portion fitting into corresponding
recesses of the other and preventing separation of the parts except by moving
one part laterally to the other. The parts may be held together by dowels or
screws and keys or wedges are employed for securing the pulley on the shaft.
The pulley may be made of wood, metal, papier-mache, or built up of different
kinds of wood or material.
In the drawings:-
Figure 1 is an elevation of the face of the pulley.
Figure 2 is a side elevation, and
Figure 3a sectional elevation on 3-3 Figure 2.
Similar letters of reference indicate corresponding parts.
The parts (a) (b) comprising the pulley are formed so that the projecting curves
upon one part fit into corresponding recesses in the other.
The meeting faces of the two parts may be of any form which will give the
effect of dovetails or modified dovetails. Thus the projection (c) on the part (az)
fits into a corresponding recess in the part (6) and a similar projection (d) upon
part (b) into a recess in the part (a).
The dividing line is cut at an angle to the axis of the shaft upon which the
pulley is to be employed as shewn by the line (g) on Figure 1 and in Figure 3.
The portions such as (c) (d) (h) and (i) thus become parts of cones and the
part (a) can be adjusted to the part (b) the projections upon one part taking.
laterally into recesses in the other.
A hole (f) receives the shaft the pulley being secured thereon by keys or other
ordinary means.
When made of wood or the like the two parts have little tendency to separate
laterally and means for fastening the parts together are not imperative.

page_text: When made of metal or otherwise when thought advisable screws or bolts (k)
as shewn more particularly in Figure 2 may be screwed from one part into the
other to prevent lateral movement.
In manufacturing the pulley of wood or similar material it may be turned in
one piece and the division made by a band saw cut. The thickness of the saw
will give clearance in the conical portion of the meeting faces of the parts and
when one part is driven laterally into the other the parts will project beyond
each other on opposite sides of the pulley and it will be advisable to true the sides
in a lathe.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, as communicated to
me by my foreign correspondents, I declare that what I claim is:
1. A split pulley comprised of two parts dovetailed together by conical pro-
jections upon one part taking into similar recesses in the other, substantially
as and for the purposes set forth herein.
2. A split pulley comprised of two parts the abutting faces of the parts being
of a curved shape and at an angle whereby projections of conical form are obtained
the projections upon one side passing laterally into corresponding recesses in the
other and means for securing the parts in position substantially as and for the
purposes set forth herein.
3. The improved split pulley consisting of parts constructed and combined,
substantially as and for the purposes set forth herein.
Tatal th
1 1
1000
W. P. THOMPSON & Co.,
322, High Holborn, London, W.C., Patent Agents for the Applicant.