Improvements in the Manufacture of Grooved Pulleys, and in Frames for containing the same
Year: 1897

page_text: Date of Application, 20th Jan., 1897
Complete Specification Left, 19th Oct., 1897-Accepted, 4th Dec., 1897
PRUVIDIUNAL DEECIFICATION.
Improvements in the Manufacture of Grooved Pulleys, and in Frames
for containing the same.
We CHARLES ROCHOLL, Foreman, and THE WESTMINSTER MANUFACTURING COMPANY
LIMITED, Manufacturers, both of 29A Gillingham Street, Pimlico, London, S.W., do
hereby declare the nature of this invention to be as follows :-
The object of this invention is to produce grooved pulleys from sheet metal for use
in the Arts, but the invention also has reference to the production of frames to carry
these pulleys, as, for instance, when they are used as sash pulleys.
In carrying out this invention, the sides of the pulley are stamped out of sheet metal,
dish shaped, with a raised centre extending beyond the edges. Other dish shaped
pieces with a raised centre are formed, for the purpose of being employed as internal
strengthening dises.
The outer edges of these discs are shaped to correspond to about one half of the
groove.
The rim is formed from a piece of tube, which is roughly formed with ;a
semicircular groove, and laterally-extending flanges.
The pulley is formed by placing two internal discs back to back in the rim, next
putting in the sides, and then bending down the flanges of the rim, to hold the parts
together.
By making the extending centres, a broad bearing is obtained, in which balls or
antifriction rollers may be placed, to overcome friction.
When the balls are not used, it is preferred to insert a bush to receive the axle.
When forming what is known as an axle pulley, that is to say, in which the axle is
an integral part of the pulley, and not added after the pulley is formed, the outer discs
are formed with central hollow knobs, which serve as the axle.
These knobs are produced by stamping a blank into the form of a cone having the
point or apex flattened, and then flattening out the base, so as to produce a disc with
the knob in the centre, as before described.
The frame to be used when the pulleys are employed as sash pulleys, are formed.in
two pieces from sheet metal.
A strip of metal is used for the plate from which the centre portion is stamped out
to provide space for the pulley, and leaving a tongue which is curled up to form a
socket to receive a pin or screw by which the wheel frame is retained.
The wheel frame consists of a blank having, at the centre, on one side, a lug, and
on the other side, two semi-ovoid portions, and with a lug at each end. The blank is,
bulged outwards at the point where the projecting portion of the wheel will come, and
the central lug is turned up at right angles.
The two semi-ovoid portions are then bent up at right angles to the lug, and the
wheel frame is ready to be applied to the plate. This is done by rivetting the
central lug to the plate, and passing a rivet through the end lugs and curled-over
socket, and rivetting the ends.

page_text: The bulged sides to the frame are not necessary, but they are desirable, as they
allow for a pulley with a broad bearing in a comparatively narrow frame.
Dated 20th day of January 1907
NEWTON & SON,
Agents for the Applicants,

page_text: rim C are then caused to lap round the parts 61 of the shaped discs b, as shewn
at Figure 2.
Or we may employ only one disc b, the other side or the wheel, and the rim,
being in one piece, as shewn at Figure 3. In this case, the side and rim may
be formed by stamping and shaping from a disc of metal in the manner now well
understood and the free end of the tubular portion thus produced will be caused
to lap round the part 1 of the disc b, as before. Or the part 6 of the disc b may
be divided up into four or more tongues half of which 6¹ will be bent to one side,
and half 62 to the other, as indicated in Figure 4.
In order to produce the "boss-axle" to which we have referred above, a disc
blank b is struck up in suitable dies into conical form with a flattened apex. We
next flatten out the base until we obtain the form shewn at Figures 5 and 6,
which represent a cross section and a top plan e indicating the boss. The edges of
the disc b will then be turned down to form the part b₁ as indicated in Figures 7
and 8, and the disc and the flanges b¹ may be otherwise shaped, as before explained.
By this mode of producing the boss the thickness of the metal of the boss will
remain the same as the rest of the disc, and will not be thinned down, as by the usual
drawing operation.
Referring now to Figures 9 to 15 the blank ff¹ is stamped out of the shape shewn
Figure 9, and at the same time the axle holes gare formed with a shoulder or flange
as indicated at g¹, to provide a better and broader bearing for the pulley axle than
the mere thickness of the metal could give. The pin or rivet holes h'h' are also
preferably formed at the same time.
The blank is bent at right angles along the dotted lines, to form the top or end
and sides of the frame, as shewn at Figures 10 and 11 and the lug he is bent upwards
at right angles to the top f¹.
The front plate j has a slot 1 through which the pulley P projects and is
provided with screw holes and a rivet hole k. Part of the tongue of metal stamped
out to produce the slot j is rolled over at the back of the plate, as shewn at
form a sleeve to receive a rivet as will be more fully explained hereafter.
to
To assemble the parts, the lug h2 is placed against the plate with the rivet hole h
coinciding with the rivet hole , and the parts are rivetted together.
.
The rivet holes h¹ will be formed to coincide with the sleeve l which will be of a
length equal to the width of the frame, and after the pulley P has been inserted in
position, a rivet m will be psssed through the holes h¹ and sleeve l, and rivetted on
both sides.
The front plate may be of brass and the other parts of iron, or the whole of iron
or brass, as may be desired.
Sash pulley frames constructed as above described will be strong and can be
produced economically and will in every respect be superior to the cast frames now
used.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what
we claim is:-
1. The mode of producing grooved pulleys as herein shewn and described, and
consisting in the use of shaped body dises having outwardly extending curved
flanges round the edge of which the shaped rim is bent, or caused to lap, as set
forth.
2. As a new article of manufacture grooved pulleys constructed as herein shewn and
described with reference to Figures 1 to 4 of the drawings.
3. The mode of producing a boss axle to grooved and other pulleys as herein
shewn and described and consisting in striking up a disc of metal into conical form,
flattening the apex, and then flattening or spreading out the base, as set forth, with
reference to Figures 5 and 6 of the drawings.
4. A frame for sash pulleys comprising a slotted front plate having a sleeve at back
integral therewith; side plates with top or end in one piece, having shouldered or

page_text: flanged axle openings and an attaching lug, and rivets passing through the lug and
front plate, and through the side plates and sleeve for securing the parts together,
substantially as herein shewn and described.
5. As a new manufacture, a sash pulley frame produced from sheet metal, and
comprising a stamped slotted front plate having a sleeve at back, stamped side pieces
having axle holes, aud a top or end piece having a lug, all in one piece, and bent to
a U shape, and means for securing the said parts together substantially as
described.
1001