Improved Mould for Making Golf Balls and the like.
Year: 1895

page_text: Date of Application, 19th June, 1895
1000
20th May
1806
Date of Application, 19th June, 1895
Complete Specification Left, 18th Feb., 1896 Accepted, 30th May,
1206
PROVISIONAL SPECIFICATION.
Improved Mould for Making Golf Balls and the like.
We, JAMES MURRAY, of 49 Hazelbank Terrace, Warehouseman, and .
ALEXANDER LEVACK, of 12 Marchmont Street, Book-keeper, both of Edin-
burgh, in the County of Midlothian, North Britain, do hereby declare the nature
of this invention to be as follows:-
This invention relates to an improved mould for making golf balls and the
like.
We employ a strong gunmetal, steel or other metal cylinder to hold the cupped
die for moulding the golf ball. The said die is made of white metal or other
metal capable of being cast, or of electro deposit, and the raised lines for the
purpose of producing the required corrugations in the surface of the ball are
made in the casting of the said white metal, thereby dispensing with the usual
hand labour required in cutting the usual die by hand labour. In order to protect
the white metal and prevent it from giving way under the heavy pressure to which
the ball is subjected between the two dies, we so construct the gun metal cylinder
that instead of the sides being vertical from the bottom upwards, the top portion
of the cylinder is made of an arch formation with a central aperture the exact
size of the ball. The pressure therefore is brought to bear upon the cups of the
die only and the rest of the white metal is thus entirely protected from damage by
the pressure.
The top surface of the said arched portion of the cylinder is
preferably bevelled, that is to say from the edge of the cup of the die to the
cylinder and the edge forming the hole through the top of the cylinder is made
as a knife edge, the advantage of this being that as the gutta-percha is com-
pressed between the two dies the surplus gutta-percha can find free exit whilst at
the same time the two dies have their edges brought into such close contact that
the surplus gutta-percha is cut off or nearly so by the closing of the two dies.
Dated this 18th day of June 1895.
JOHNSONS,
115 St. Vincent Street, Glasgow, Applicants' Agents.
COMPLETE SPECIFICATION.
Improved Mould for Making Golf Balls and the like..
We JAMES MURRAY, of 49 Hazelbank Terrace, Warehouseman, and
ALEXANDER LEVACK, of 12 Marchmont Street, Book-keeper, both of Edin-
burgh in the County of Midlothian, North Britain 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 an improved mould for making golf balls & the like.
We employ a strong gunmetal, steel, or other metal cylinder made in two
halves, to hold the cupped dies for the purpose of forming the ball in the
mould.
In order to make the two halves of the cylinder fit each other accurately, so
that the edges of the cupped dies may meet each other exactly, we so construct

page_text: the two halves of the cylinder, that, in one of them, instead of the cylinder, being
level with the edge of the die, it is carried for a certain length above the edge of
the die forming a socket into which the other half of the cylinder enters, the
cylinder of this half instead of being level with the edge of the die, being cut
away for nearly the same depth under the level of the edge of the die, so that the
edges of the cupped dies meet each other exactly, and form a perfectly spherical
ball in the mould when the dies are closed together.
Again, in order to relieve the edges of the cupped dies from the pressure applied
to the cylinder for the purpose of forming the ball in the mould, the two halves of
the cylinder are fitted together in such a manner, that, the outer edges of the
cylinder and the edges of the cupped dies meet almost simultaneously when the
pressure is applied, that is to say, when the outer edges of the cylinder are closed
together, the edges of the cupped dies are barely meeting, being very slightly
apart, thus the outer edges of the cylinder only, are subjected to the pressure
applied to the mould and the edges of the cupped dies are subjected to the
pressure of the gutta percha only when it is compressed between the two dies.
Again, in order to prevent the one half of the cylinder from being moved round
in the socket of the other when in operation, and also to have the raised lines in
the dies which form the corrugations on the ball meeting each other exactly & so
making these lines continuous, a notch is cut in the raised portion of the socket
half and a guide pin of corresponding size inserted in the recessed portion of the
cylinder of the other half in such a manner that, when the two halves of the
cylinder are closed together the raised lines in the dies have their extremities at
the edges of the dies coinciding, thus the lines are continuous & form a series of
complete circles in the ball when formed.
The cupped dies are made of white metal or other metal capable of being cast,
and are formed by casting, preferably white metal through an orifice in the
cylinder, the interior of the cylinder being thoroughly tinned to allow of the
white metal adhering thereto, and the raised lines in the dies for the purpose of
forming the corrugations in the surface of the ball, are made in the casting of the
said white metal.
In order to protect the white metal and prevent it giving way under the pressure
to which it is subjected from the guttapercha between the two dies when forming
the ball, we so construct the cylinder, that, instead of the inside being vertical
from top to bottom the top portion of each half of the cylinder is made of an arch
formation with a vertical aperture the exact size of the ball. The pressure there-
fore is brought to bear upon the cups of the dies only and the rest of the white
metal is thus entirely protected from damage.
The top surface of the said arched portion of each half of the cylinder is
preferably bevelled, that is to say from the edge of the cups of the dies to the
cylinder and the edge forming the hole through the top of the arch in each half of
the cylinder is made as a knife edge the advantage of this being that as the gutta
percha is compressed between the two dies the surplus gutta percha can find free
exit whilst at the same time the two dies have their edges brought into such close
contact that the surplus gutta percha is cut off, or nearly so, by the closing of the
two dies.
Again in order to protect the white metal at the bottom of each half of the
cylinder, and also to strengthen the cylinder and thus prevent it giving way under
the pressure to which it is subjected when forming the ball, we so construct the
cylinder that the bottom portion of the inside of each half of the cylinder is also
made with an arch formation of gunmetal extending from side to side of the
cylinder, and tapering from the centre of the inside of each half towards the
centre of the bottom, the key of the arch in each half, being horizontal and equi-
distant from the sides of the cylinder, and the crown of the arch being formed by
the bottom of the cylinder.
The pressure therefore is brought, to bear upon these arches when the mould is
in use which by their position protect from damage the white metal at the bottom

page_text: of each half of the cylinder, while at the same time they materially strengthen the
cylinder.
The following are the references to the accompanying drawings of the mould.
Fig. 1. is an elevation.
Fig. 2. is a section through A B.
Fig. 3 is the plan of the male half shewing the guide pin.
Fig. 4 is the plan of the socket half, shewing socket for guide pin.
Fig. 5 is a sectional elevation of the male half through C. D.
Fig. 6 is a sectional elevation of the socket half through E F.
Fig. 7 is the plan.
Fig. 8 is an elevation, shewing the mould open.
a a are the white metal dies cast in the cylinder for forming the ball.
b is the recessed portion of the male half of the cylinder and
c is the raised portion of the socket half of the cylinder.
d is the guide pin inserted in the male half of the cylinder and
e is the corresponding notch cut in raised portion of the socket half of the
cylinder.
f.f. are the cups of the white metal dies shewing the raised lines for making the
corrugations on the ball when formed in the mould.
99 are the arch formations at the top portion of each half of the cylinder which
have their edges at the cups of the dies made as knife edges thus protecting
from damage the white metal and also cutting off, or nearly so, the surplus
guttapercha.
hare the bevelled faces on the top of the arch formations at the top
portion which form an open space for the free exit of the surplus guttapercha.
kk are the arch formations at the bottom portion of each half of the cylinder
which strengthen the cylinder & protect from damage the white metal.
Having now particularly described & ascertained the nature of our said inven-
tion & in what manner the same is to be performed, we declare that what we
claim is
(1.) The construction of the top portion of each half of the cylinder with an
arch formation which protects from damage the white metal & prevents it from
giving way under the pressure to which it is subjected when being used for the
manufacture of the ball.
(2.) The construction of the edge of the arch formation on each half of the
cylinder as a knife edge thereby cutting off, or nearly so, the surplus gutta percha
when the two dies are brought together.
(3.) The construction of the bottom portion of each half of the cylinder with
an arch formation which protects from damage, the white metal at the bottom, and
at the same time strengthens the cylinder.
Dated L
1000
JAMES MURRAY.
ALEXANDER LEVACK,
12 Marchmont Street, Edinburgh.