Year: 1888

page_text: I, CHARLES FREDERICK CLARK, of the firm of T. and C. Clark and Company, of
Shakespeare Foundry, Wolverhampton in the County of Stafford, Ironfounders, do
hereby declare the nature of this invention to be as follows :-
This invention relates to a method of manufacturing frame-pulleys, according to
which considerable economy is effected in labour.
According to this invention, the sheave is formed with the usual round hole through
its centre, or otherwise with a round hold formed in at the centre on each side for any
desired distance. These latter holes may be conveniently formed of a tapering or
reducing curved shape longitudinally and rounded at their inner ends to facilitate the
turning of the sheave on the studs hereinafter described. The sheave is then rammed
up in a sand core suitable for coring out the mould for the frame, but the hole there-
through or the holes in each side thereof are left uncovered by the sand. The frame is
then cast in a mould in which the core aforesaid is placed, and thus a part of the
metal runs through the central hole of the sheave and forms a pin therethrough, or
runs into the holes formed partly through the sheave and forms studs therein projecting
from the sides of the frame. The frame is thus cast around the sheave, and the sheave
is free to turn upon the pin therethrough which is solid with the frame, or upon the
studs which enter from the sides of the frame into the holes formed in the axis of the
sheave. The labour of mounting the sheave upon a separate pin is thus avoided, and
no indication is visible of the means by which the sheave is mounted within the
frame.
1000
STEPHEN WATKINS,
Wolverhampton and Walsall,
Agent for the Applicant.

page_text: I, CHARLES FREDERICK CLARK, of the firm of T. and C. Clark and Company, of
Shakespeare Foundry. Wolverhampton in the County of Stafford, Ironfounders, 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 a method of manufacturing frame-pulleys, according to
which considerable economy is effected in labour.
According to this invention, the sheave is formed with the usual round hole through
its centre, or otherwise with a hole formed in concentrically at each side of the sheave
for any desired distance. The sheave is then rammed up inside a sand core of the
usual character for coring out the mould for the frame, and the hole through the
sheave or the holes aforesaid in each side thereof are left exposed. The frame is then
cast in a mould of the usual character in which the core, aforesaid, has been previously
placed, and thus a part of the metal runs through the central hole of the sheave and
forms a pin therethrough, or runs into the holes aforesaid formed partly through the
sheave and forms studs therein projecting front the sides of the frame. The frame is
thus cast around the sheave, and the sheave is free to turn upon the pin therethrough
which is of course solid with the frame, or upon the studs which enter from the sides
of the frame into the holes formed therefor in the sheave.
In order that the means of carrying out the invention into practice may be clearly
understood I will now describe the same with reference to the accompanying
drawings.
Figure 1 is a transverse section of a frame pulley manufactured according to a
modification of this invention in which studs are cast with the frame so as to project
into holes cast or drilled in the axis of the sheave; and figure 2 is a side elevation of
such frame pulley. The studs a a are shewn projecting, respectively, from the inner
faces of the sides A A of the frame and into corresponding holes or recesses formed in
the centre of the sheave B on each side thereof. It is preferred to thicken up each
side of the frame at the middle thereof, as shewn at bb, in order to give extra strength
at the parts where the studs are formed.
The method of forming the core, with the sheave rammed up inside it, is shewn by
figures 3, 4 and 5, of which figure 3 is a view looking down into the lower of the pair
of boxes in which the core is first rammed, with the sheave placed in position therein
ready for the ramming up of the core. Figure 4 is a section taken on line x x of
figure 3, with the upper box shewn upon the lower and with the core rammed up as
far as it can be in these boxes. Figure 5 is a corresponding view to figure 4, and
shews the core to be fully rammed up in a second pair of boxes. The lower box C,
figures 3 and 4, has an annular fillet cc (shewn by broken circles figure 3) standing
up from its inner face to a height which corresponds with the thickness of sand which
it is desired shall cover the side of the sheave when the core has been completely

page_text: rammed up, and a stud or centre piece d (shewn by broken circle figure 3) stands up
from the inner face of such box in position to receive around it one of the holes formed
in the centre of the sheave. The sheave is placed in position over the stud d (by which
it is maintained in position during the ramming of the sand in the boxes CD) and
rests upon the fillet c c, and after the sand has been rammed into the lower box C the
upper box D is placed upon the box C, being fitted thereto by means of he-and-she
parts as is usual with these kinds of boxes, and the sand is completely rammed up
within the boxes and levelled to the outer face of the box D. The depth of the box D
is such that when the sand has been rammed up therein the proper thickness of sand
covers the upper side of the sheave. Any sand which may fall into the hole e formed
in the centre of the pulley is removed. After the core has been rammed up to the
extent described in the boxes C and D the upper box D is first removed and is
replaced with the lower box E (figure 5) of the pair in which the core is completed,
the interior of this box corresponding to the interior of the box D excepting that the
box E is closed at its back and is formed with a projection f to enter and fit easily
within the hole e of the sheave. The boxes E and C are then turned over so as to
bring the box E into the lower position, and the box C is then removed and replaced
with the box F which corresponds in internal dimensions with the box (but is
entirely open at its back. The core is then finally rammed up, that is to say, the sand
is rammed up over the side of the sheave which is shewn as downwards in figure 4,
but which is shewn as upwards in figure 5. Any sand that may fall into the hole fis
removed.
It will readily be seen that when the core thus formed with the sheave therein is
employed within the mould the molten metal will run into the holes e and g formed in
the centre of the sheave and form studs as it cools, and that if the hole is formed right
through the centre of the sheave (by casting or drilling) the molten metal will run
clear through and form a pin as it cools. The slight shrinkage of the metal in cooling
causes the studs or pin to be sufficiently easy within the holes or hole to allow of the
sheave readily turning on such studs or pin. When studs are employed it is preferred
to form the holes in the sheave of a hemispherical or an analogous shape, as
shewn.
By employing the invention above described the labour of mounting the sheave
upon a separate pin is avoided, and no indication is visible of the means by which the
sheave is inounted within the frame.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what I
claim is :-
In the manufacture of frame pulleys, casting the frames around the sheaves and
with pins or studs passing through holes formed through the centres of the sheaves or
projecting into holes formed in the sheaves concentrically therewith, substantially as
described, for the purpose set forth.