Rubber Dies or Stamps.
Year: 1886

page_text: Rubber Dies or Stamps.
I ALFRED JULIUS BOULT of 323 High Holborn in the County of Middlesex,
Engineer, do hereby declare the nature of this invention (a communication from
George James Bellamy Rodwell of Toronto, Canada, Manufacturer) and in what
manner the same is to be performed, to be particularly described and ascertained
in and by the following statement :-
The object of the invention is to produce a machine by which, comparatively
speaking, unskilled parties can make, with rapidity and ease, vulcanized rubber dies
or stamps; and it consists essentially, in pivotting the flask which contains the
impression material between a case in which the type to be copied is set and a
press for compressing a piece of rubber on to the mould for receiving the impression
therefrom, substantially as hereinafter more particularly explained.
Figure 1, is a perspective view of this improved machine, showing the flask
resting on top of the case.
Figure 2 is a perspective view of the machine showing the case in the press.
Figure 3 is a detail of the flask containing the impression material.
Figure 4, is a detail of the piece of rubber to be formed into a die or stamp.
A, represents a flask made any suitable size. This flask is pivotted at a, which
pivot is at such a point that the flask, A, may be thrown either on to the bed-
plate, B, or the case, C.
D, is a follower pivotted on one of the standards, E, and operated by a screw, F,
which passes through a nut in the top plate, G, also pivotted on the same standard
as the follower, D, so that the follower and screw may be swung clear of the bed-
plate, B, as indicated in Figure 1.
Having filled the flask, A, with suitable impression material, for instance, dental
plaster, or any other plastic material which will receive an impression from the
type, I swing the flask off the bed plate, B, on to the case, O, as indicated in
Figure, 1, in which case the type has already been set. After compressing the flask
with sufficient force to obtain the impression from the type on the material in the
flask, the said flask is swung back on to the bed-plate A.

page_text: With the view of ensuring an even impression I pivot the case, C, in boxes, H,
which are carried between the jaws, I, located at either end of the case, C. The
said boxes are supported on springs, J, so that when no pressure is upon the case
the said case will swing freely on its pivot, but when it becomes necessary to force
the flask down upon the case the springs J yield sufficiently to allow the case to
rest on the bed-plate so that the necessary pressure to secure the impression is
possible.
In small machines the handle K attached to the flask A, will be found sufficient
to ensure the necessary pressure, but in larger machines I provide a lever L pro-
vided with a pivoted plate M which may be brought down upon the top of the
flask A and the necessary pressure secured by the lever L.
Having obtained the impression from the type in the case C, I, as before stated
swing the flask back onto the bed-plate B and after placing the piece of rubber N
on top of the mould I swing the follower D over into the position in which it is
shown in Figure 1 and screw down the follower with sufficient pressure to secure
the impression from the mould.
I should have mentioned that the piece of rubber N is prepared for vulcanizing
and it is vulcanized when under pressure in the press by means of the lamp O
which is placed below the bed-plate B and when lighted heats the said bed-plate
and contents of the flask H to the required heat to vulcanize the rubber as stated.
Those familiar with the art of manufacturing rubber dies or stamps will under-
stand that the chief advantage of this device consists in the rapidity with which
the impression is taken after the material has been placed within the flask as it is
accomplished before the material has had time to harden. It will moreover be
seen that the mould may be handled with great nicety and the pressure regulated
so that the material need not be broken while being manipulated against the type.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed as communicated to
me by my foreign correspondent I declare that what I claim is :-
1. The pivoted flask A in combination with a press and type-case arranged sub-
stantially as and for the purpose specified.
2. A flask A pivoted at a and arranged to rest upon a bed-plate B in com-
bination with the pivoted case C arranged substantially as and for the purpose
specified.
3. The pivoted flask A arranged to rest upon the pivoted case C in combination
with the springs J arranged to support the pivot-points of the case C substantially
as and for the purpose specified.
4. A pivoted flask A arranged to rest upon the pivoted case C supported by
the springs J in combination with the lever L provided with a pivoted plate M
substantially as and for the purpose specified.
5. The pivoted flask A arranged to rest upon the bed plate B in combination
with the follower D pivoted on one of the standards E and operated by the screw F
substantially as and for the purpose specified.
6. The pivoted flask A resting upon the bed plate B in combination with the
lamp O arranged substantially as and for the purpose specified.
D
1
0 1
M 100