Improved Method of and Means for Moulding Pulleys and similar Articles.
Year: 1891

page_text: Date of Application, 27th Aug., 1891-Accepted, 10th Oct., 1891
COMPLETE SPECIFICATION.
Improved Method of and Means for Moulding Pulleys and similar
Articles.
I, GEORGE RICHARDS, of 145 Cannon Street, London, in the County of
Middlesex, 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'
n and by the following statement :-
My improvements refer to a system of moulding pulleys and such like articles
having a number of similar arms projecting from a central boss. The invention
also refers to the manner or method of making the separate patterns so as to reduce
the total number and expense of sucli patterns, at the same time permitting of
them being employed for different sizes of pulleys. My improvements refer more
particularly to moulding the cast iron centres of wrought iron rim pulleys, of the
type known as the "Medart" system.
COMPLETE SPECIFICATION.
Improved Method of and Means for Moulding Pulleys and similar
Articles.
I, GEORGE RICHARDS, of 145 Cannon Street, London, in the County of
Middlesex, 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
n and by the following statement :-
My improvements refer to a system of moulding pulleys and such like articles
having a number of similar arms projecting from a central boss.. The invention
also refers to the manner or method of making the separate patterns so as to reduce
the total number and expense of such patterns, at the same time permitting of
them being employed for different sizes of pulleys. My improvements refer more
particularly to moulding the cast iron centres of wrought iron rim pulleys, of the
type known as the "Medart" system.
Referring to the accompanying drawing
Fig. 1 is a plan of the moulding plate.
Fig. 2 is a side view of the moulding plate.
Fig. 3 is a section of a moulding box in position on the moulding plate, over a
pattern.
Fig. 4 is a section of a smaller moulding box on the same plate.
Fig. 5 is a plan of a moulding box.
Fig. 6 is a plan of a set of pattern arms and centre put together, and
Fig. 7 is a side elevation of same.
Fig. 8 is a plan of a centre with arms of different lengths.
Fig. 9 is a section of a small moulding box fitted to a larger one..
Fig. 10 is an enlarged plan view of one of the pattern arms, and
Fig. 11 is a side elevation of same.
In carrying out my system I first prepare a thick cast iron moulding plate_1, as
shown in Figs. 1 and 2. The top of this plate is accurately planed or turned, and
a hole 2 drilled in the centre. I then plane a number of narrow grooves 3, 3, 3, 3,
3, 3, 3, 3, in the plate, to correspond with the number of arms in the pulley to be
moulded. These grooves are generally ths to th of an inch wide, and ths
to 1 inch deep, according to the size of the pulleys to be moulded. I also
drill at different distances from the centre of the plate 1, holes 4, 4, 4, 4, to
act as guides for pins on the moulding box, when such box is placed on the
plate.
In order to mould the pulley arms and boss complete, I first put on the plate i
a centre piece 5 shown in Figs. 6 and 8.
The pattern of the boss 15 of the pulley is placed on the centre piece, the size of
same being determined by the hole to be bored in the pulley.
The centre piece 5 is held central by a pin 16 projecting from its under side
into the hole 2 of the moulding plate 1 (Fig. 1). I then put the arms 6, 6, 6,
6, 6, 6 (Fig. 6) on the plate 1, the tongues 7 fitting into the grooves 3 of such
plate. The arms are thus accurately spaced with reference to the periphery. The
moulding box 8 (Fig. 5) is then placed over the pattern on plate 1 in the manner
shown in Fig. 3, the dowel pins 9, 9, fitting into the holes 4, 4, in the plate, as
shown. The sand is then filled into the box and rammed in the ordinary way. The
box is then lifted off plate 1, and the arms 6, 6, 6, centre piece 5 and boss 15, come
away from the plate, and adhere to the sand in the box. After the box is turned
over the patterns are then withdrawn from the sand by the projections 7, 7, on the
arms 6, 6, and the pin 16 on the centre piece 5. This completes the moulding of
one half of the mould. The arms and centre piece are then put back on the
Din Bl

page_text: plate 1, and the other half of the mould prepared' in the same manner, and the
two halves put together as is well known to those engaged in foundry work.
In addition to the saving in time in removing the patterns from the sand in
single pieces instead of lifting the whole set at one time as is usual, I obtain
many important advantages in the system of using separato patterns. For example,
I have shown in Fig. 8, a centre piece: 5, to which armis, 10, 11, 12, of different
lengths are applied in position for producing pulleys of largely different diameters.
It will also be seen that pulleys of slightly varying diameters can be made by
leaving a gap between the arm patterns and the centre piece, as shown at 18 in
Fig. 8. By having a comparatively small number of patterns of arms of different
lengths and strengths, pulleys of different diameters and strengths can be readily
cast in combination with different sized bosses in the centre.
The method of arranging the dowel or guiding pins 9 of the moulding boxes 8,
also presents advantages in keeping the outside clear, which allows the boxes to be
rolled about on the floor of the foundry. It also enables two or three, standard
sizes of boxes to be used for all sizes of patterns. I have shown in Fig. 9 an
example of a small half box placed on a larger half box, the dowel holes of which
correspond, the holes in all sizes of boxes being drilled from templates.. This
admits of an interchangeability of the boxes which reduces the total number
required in the foundry for producing a certain number of castings.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that.what I
claim is :-
1. The method of moulding pulleys or other similar articles by interchangeable
arm patterns fitted to grooves in a suitable table or moulding plate for producing a
variety of sizes of pulleys from one set of arms in combination with a central piece
or plate to which the pulley boxs is attached, substantially as specified.
2. The method of using separate arm patterns for pulleys or other articles in
combination with separate centre plates for producing pulley centres or other
articles of different diameters, substantially as specified.
3. The combination of a moulding plate with grooves and a moulding box with
pins within the rim corresponding with holes in the moulding plate, for producing
the top and bottom halves of the moulds for casting pulleys or similar articles from
the same pattern, and to permit boxes of different sizes to be, dowelled or pinned
together, substantially as specified.
Dated this 27th day of Avoust. 1891
ALLISON BROS,
Agents for the Applicant.