Improvements in and in the Manufacture of Belt Pullies.
Year: 1893

page_text: Date of Application, 9th Oct., 1893
Complete Specification Left, 8th July, 1894-Accepted, 11th Aug., 1894
PROVISIONAL SPECIFICATION.
Improvements in and in the Manufacture of Belt Pullies.
HARRY JAMES GRICE 50 Lower Fazeley Street Birmingham Engineer do
hereby declare the nature of this invention to be as follows:-
The substitution of wrought iron arms in cast iron belt pullies while retaining
the cast iron rim and boss.
The wrought iron arms decrease the weight and increase the strength of pully
while the cast iron rim increases the gripping power of belt over a wrought iron
rim. I also claim as a novelty the manner of making them.
The mould for casting these pullies is made as follows a ring for producing the
outer rim of pully is prepared in the usual manner, this is laid upon a true bed or
surface, the centre or boss of pully is formed in the following manner and forms a
feature of its novelty for their rapid construction, a core box is prepared which
forms the centre boss of pully, under construction, this is made in sections, if a
pully with only one row of arms is intended to be produced the centre core would
be in 2 parts, after the first half has been laid on the bed of the mould, wrought
iron round or other section arms are placed in suitable grooves which are formed in
the centre core for their reception, causing them to truly radiate to the outer rim,
the arms extend to the inner side of the pully rim, on each arm at the rim end a
small boss is slipped over the arm, when the outer ring after being moulded in the
usual manner is withdrawn, these bosses are left exposed and can also be withdrawn,
leaving the arms in position for casting, the molten metal forms the rim and the
boss around arms thus causing the arms to be firmly attached; when it is intended
to make a deep faced pully centre cores are added which allows any number of
rows of arms to be in position according to the width and power to be transmitted,
the rim being separated from the boss by the W-1 arms, it is necessary in casting
these pullies to prevent cracking the rim by contraction, to cast the rim first, and
when nearly cool to cast the centre boss, which features I claim as novelties in their
construction.
Dad thin 5th do of October 1803
COMPLETE SPECIFICATION.
. Improvements in and in the Manufacture of Belt Pullies.
HARRY JAMES GRICE Engineer 50 Lower Fazeley Street Birmingham 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:-
The casting in of wrought iron mild steel or tubular arms of any approved section
in light cast iron rimmed belt pullies, which I proceed to do as follows,
either in
Fig. 1 is a section through its centre of a pully in the mould, which I form in the
following manner the rim R is a truly turned cast iron ring this is laid upon a true
bed of sand or table B, to form the centre or boss of pully I make cores
dry or green sand, these cores may be extended to the inside edge of rim R and
form part of the mould for rim, for the larger pullies the cores for forming the
centre or boss are as shewn in plan and elevation Fig. 2, these cores have half
grooves formed in them radiating from the centre, these may be any number
7

page_text: according to the diameter of pully under construction, the centre for single or
radiating arm pullies may be formed with chills, after placing the first core C on
the bed I place in the grooves formed in the cores or chill, the arms A, these are
cut to the length required having grooves cut in each end as shewn, the arms
extend to the inside of the rim R, on this end on all arms is placed a loose boss E,
core C2 is then placed in position, this drops over the arms holding them in
position while the sand is rammed on the outer circle F forming the inside rim of
pully, if it is desired to make a deep faced pully by the addition of other cores C 3
and C4 another row of arms can be added, these may be extended to any number,
in placing in a second row of arms I place them to come between the arms already
laid down, giving more strength to the rim of pully, by forming the grooves in the
cores to suit the angle, the arms may be placed at any angle as shewn in dotted
lines in Fig. 3 the arms radiating from the outside edges of boss to the centre of
rim for narrow faced pullies this gives additional strength, when the sand is rammed
up to the top of rim R, the outer box H is lowered over, this is made up in the
usual manner, after the top J is taken off, the ring pattern R is drawn out, the
outer rim of mould removed, and the bosses E drawn off the arms, leaving a space
for the metal to form around the arms firmly securing them in the rim, the mould
is finished and put together in the usual manner, the outer ring H is lowered over,
the centre core I put in, the top part J placed on, or by forming the bosses E in a
core, rammed up in the mould as before described, the outer box H need not be
taken away to remove the loose bosses E, it is only necessary to withdraw the rim
pattern R to complete this part of the mould, this ensures the metal in the rim
being of an even thickness all round, preventing any risk of the workman lowering
the outer box H out of position, and throwing a thick and thin side in the pully
when cast, these pullies if cast true in the rim, when they revolve on the shaft are
perfectly in balance.
When the mould is completed the metal is poured into the rim and boss of small
pullies nearly together, but in large pullies I prefer to cast the rim first, and when
this is nearly cold to pour the metal in the boss, the contraction of metal is then
even all over.
Fig. 3 & 4 shew the pully when completed, the adoption of wrought iron or
other kind of arms as described cause the pully to be stronger, and lighter than an
ordinary pully with cast iron arms, and the rim being of cast iron, therefore porous,
the gripping power of belt is greater than it would be if made of wrought iron or
steel, as is usual with wrought iron arm pullies.
Having now particularly described and ascertained the nature of my inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is.
1. The casting in of wrought iron or mild steel bars, or wrought iron, or steel
tubes, into the boss and rim of a light cast iron belt pully, forming a light, truly
balanced pully, of great gripping power.
2. The formation of centre, and bosses of pully, by means of cores or chills as
described.
3. The casting of arms at any angle, by forming the grooves in cores at the
required bevil.
HARRY J. GRICE.