Improved Wooden Pulley.
Year: 1894

page_text: Date of Application, 20th Apr., 1894
Complete Specification Left. 18th Sept., 1894-Accepted, 20th Oct., 1894
PROVISIONAL SPECIFICATION.
Improved Wooden Pulley.
1 MAURICE WILLIAM SMITH Chair Manufacturer of No. 12 Coronet Street
Hoxton London in the County of Middlesex England do hereby declare the nature
of this invention to be as follows:
The rim of the pulley consists of layers of veneer glued together, every alternate
layer of veneer having the grain of wood running across or at right angles to the
layer preceeding it.
The spokes of the pulley are secured to the rim by doweling and wedging from
the outside of the rim.
Dated this 20th of Al A n 100.0
Improved Wooden Pulley.
I, MAURICE WILLIAM SMITH, of No. 12, Coronet Street, Hoxton, London,
in the County of Middlesex, Chair Manufacturer, 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 wooden pulleys and has for its object to produce strong,
durable, and efficient pulleys of far less weight and with greater or equal strength,
but at considerably less cost than such pulleys as heretofore constructed.
According to my invention I build up the rim of the pulley of a series of
circumferential layers or veneers of wood glued together. The grain of the wood
of the outer layer runs circumferentially, and that of the next transversely, and so
on alternately, the grain of cach layer being disposed and running transversely or
at right angles to that of the adjacent layer or layers preceding and succeeding it.
This compound rim is bent to the required radius and fixed to the spokes of the
pulley by dowelling and wedging if necessary from the outside of the rim.
In further explanation of my invention I will refer to the accompanying drawing
in which Fig. 1 is a side elevation; Fig. 2 a part enlarged section of rim showing
fixing to a spoke; Fig. 3 a cross section on line 1-2 of Fig. 2; and Fig. 4 a plan
at joint of the split pulley illustrated in Fig. 1.
R is the rim shown as built up of three layers of thin wood, but any
number of layers may be employed according to the diameter and strength of pulley
required. The grain of the wood of the outer layer forming the working face of
the pulley is disposed in the circumferential direction, as is also that of the third
layer, and the fifth and so on alternately when more are employed. The grain of
the wood of the second layer 2, as also of the fourth, and so on alternately when
more are employed, is disposed transversely or crossways of the rim, at right angles
to that of the aforesaid adjacent layers r¹³, &c. All the layers are firmly glued
together and then bent over a mould to the required radius, and produce in effect a
solid rim; and when intended for use in damp situations they may be further
secured by rivetting, lacing, or otherwise. The layers may be of equal thickness
as shown, or of varying thicknesses, the inner ones being thinner than the outer
layers.

page_text: In cylindrical pulleys the layers may run the complete circumferential length,
or be jointed where desired, and for half length in split pulleys.
For securing the rim to the spokes, tapered holes are bored through the rim, and
parallel holes in the spoke heads S. Into these holes corresponding shaped pegs or
dowels D are driven from outside the rim, a coating of glue being applied, and may
be further secured if necessary by lateral metal or wood pins such as d d in the
spoke-head. Thus a firm and rigid attachment is effected. In split pulleys such as
Fig. 1 the spokes S¹ at either side of the split are made of solid wood and fixed to
the rim R as above with four or more pegs D at either side of the split, as shown in
Fig. 4. The heads S of the spokes S are formed to meet at the split and are
firmly secured by one or more through bolts B, Fig. 1.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
:-
1. Constructing wooden pulleys with the rims built up of a series of separate
layers or veneers of wood permanently glued and fixed together and bent to the
required radius, the grain of the wood in the cuter layer and its alternate layers
being disposed circumferentially, and that of the second layer and its alternate
layers transversely, substantially as and for the purposes set forth.
2. In wooden pulleys having compound rims constructed as above described and
claimed, the method of securing the spokes to the rim by taper-headed wooden
dowels, with lateral pins if required, substantially as above set forth.
3. The construction of wooden pulleys in the manner above described and illus-
trated in the drawings.