IMPROVEMENTS IN THE MANUfacture of HOLLOW INDIA RUBBER BALLS AND IN APPARATUS THEREFOR
Year: 1884

page_text: I PETER JENSEN of 33 Chancery Lane in the County of Middlesex do hereby
declare the nature of said invention for "IMPROVEMENTS IN THE MANUfacture of
HOLLOW INDIA RUBBER BALLS AND IN APPARATUS THEREFOR" (A communication to
me from abroad by "Vereinigte Gummi Waaren Fabriken Harburg Wien" of
Harburg on the Elbe Germany, Manufacturers of India rubber goods) to be as
follows:-
Hollow India rubber bills are usually made by cutting or stamping out three
or four segments of a globe surface from a sheet of rubber and then gluing their
edges together by hard to an approximate ball shape; the vulcanizing is then
effected in the usual manner. Or according to the "Lejeune" process hollow half
balls with taper edges are made by a machine and then glued together by hand,
and then vulcanized.
The object of this invention is to make the hollow ball directly from flat circular
rubber discs and with the least possible manual labour. The process is as follows:-
Circular discs with square edges are cut or stamped out of sheet rubber; the edges
are then wetted with an India rubber solvent or with dissolved rubber, or simply
made hot in the usual manner. The discs thus prepared are then pressed into half
ball shaped moulds and two such half moulds containing each a rubber half ball
placed upon or pressed against each other in such manner that the sticky edges
are glued together. Previously to this the material for vulcanizing is placed in the
interior of the ball.
On taking the mould apart the ball is exposed to view and ready tɔ bo
vulcanized.
The apparatus may conveniently be made as follows :-
==
The lower part of the mould consists mainly of an outer cylindrical shell and an
inner die part having a half round recess (or the lower part may be in one piece)
The upper edge of the cylinder has an outer rebate, and on it fits n funnel.
The upper part of the mould consists similarly of an outer cylindrical shell of
the same outer diameter as that of the cylinder of the lower part of the mould,
IP C11

page_text: and of an inner die part provided with half round recess and fitting well but
movably in the cylindrical shell. The latter has a rehnte along its circular inner
edge and a feather along its outer edge corresponding with the circular feather and
rebate of the cylinder of the lower part of the mould; the edge also serves to
receive a funnel as in the case of the lower part.
n
In order to make a ball, the fat rubber disc is laid in the funnel and by the hand
or by a suitable tool pressed into the concave of the mould; the material for
vulcanizing is then put in and the funnel taken off. In a similar manner a disc of
rubber is put into the other half mould and its funnel taken off. The two halves
of the mould are then fitted onto each other, and by pressing the movable die of the
upper part down (by pressure or by a blow with a hammer) the sticky edges of the
two half balls are glued together, the enclosed air maintaining the ball in shape.
The upper half of the mould is now removed and the ball taken out and
vulcanized.

page_text: "
I, PETER JENSEN of 33 Chancery Lane in the County of Middlesex do hereby
declare the nature of said invention for "IMPROVEMENTS IN THE MANUFACTURE OF
HOLLOW INDIA-RUBBER BALLS AND IN APPARATUS THEREFOR (a communication to
me from abroad by "Vereinigte Gummi Waaren Fabriken Harburg Wien" of
Harburg on the Elbe Germany Manufacturers of india-rubber goods) and in what
manner the same is to be performed to be particularly described and ascertained in
and by the following statement:-
Hollow india-rubber balls are usually made by cutting or stamping out three or
four segments of a globe surface from a sheet of rubber and then glueing their edges
together by hand to an approximate ball shape; the vulcanizing is then effected in
the usual manner. Or according to the "Lejeune" process hollow half balls with
taper edges are made by a machine and then glued together by hand, and then
vulcanized.
The object of this invention is to make the hollow ball directly from flat circular
rubber discs and with the least possible manual labour. The process is as follow:-
Circular discs with square edges are cut or stamped out of sheet rubber; the edges
are then wetted with an india rubber solvent or with dissolved rubber, or simply
made hot in the usual manner. The discs thus prepared are then pressed into half
ball shaped moulds, and two such half moulds containing each a rubber half ball
placed upon or pressed against each other in such manner that the stickey edges
are glued together. Previous to this the material for vulcanizing is placed in the
interior of the ball.
On taking the mould apart the ball is exposed to view and ready to be vulcanized.
The apparatus may conveniently be made as follows:-Figure 1 is a vertical
sectional elevation of the bottom half of the mould with a funuel put on, and with
the rubber disc put in; Figure 2 is a like view of the top half of the mould with
a funnel put on; and Figure 3 is a like view of the two half moulds put together
and with the rubber parts put in.
The lower part Figure 1 of the mould consists mainly of an outer cylindrical
shell a and an inner die part 6 having a half round recess (or the lower part may be
in one piece). The upper edge of the cylinder has an outer rebate, and on it fits a
funnel c.
The upper part Figure 2 of the mould consists similarly of an outer cylindrical
shell a¹ of the same outer diameter as that of the cylinder of the lower part of the
mould and of an inner die part 6' provided with half round recess and fitting well
but movably in the cylindrical shell a' The latter has a rebate along its circular
inner edge and a feather along its outer edge corresponding with the circular feather
and rebate of the cylinder of the lower part of the mould; the edge also serves
to receive a funnel c' as in the case of the lower part.
In order to make a ball, the flat rubber disc is laid in the funnel c as shown in
dotted lines in Figure 1 and by the hand or by a suitable tool pressed into the
concave of the mould so that it assumes the position there shown in dotted lines;

page_text: the material for vulcanizing is then put in, and the funnel taken off. In a similar
manner a disc of rubber. is put into the other half mould and its funnel taken off.
The two halves of the mould are then fitted into each other, and by pressing tho
movable die of the upper part down (by pressure or by a blow with a hammer) the
stickey edges of the two half balls are glued together, the enclosed air maintaining
the ball in shape. The upper half of the mould is now removed and the ball taken
out and vulcanized.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed I declare that what
I claim as the invention communicated to me is
First: The manufacture of hollow rubber balls from separate rubber discs the
edges of which are made suitable for sticking (by a solution for rubber, or by
dissolved rubber, or by heating) by pressing such discs into suitable hollowed out
mould halves and combining the latter thus producing a ball space, and by pressing
the edges of the rubber together uniting the two rubber parts substantially as set 1
fortb.
Second
The construction of the mould as described and shown.