Improvements in Machines for Pressing and Moulding Plastic Materials.
Year: 1891

page_text: Date of Application, 1st July, 1891
Complete Specification Left, 31st Mar., 1892-Accepted, 7th May, 1892
PROVISIONAL SPECIFICATION.
Improvements in Machines for Pressing and Moulding Plastic
Materials.
I HENRY JAMES CHAPPELL of 26 Blythwood Road, Crouch Hill, in the
County of Middlesex, do hereby declare the nature of this invention to be as
follows:-
My invention has for its object a means whereby greater density may be
imparted to plastic materials or semi-molten metals during the process of moulding
than has hitherto been obtained.
According to this invention the press is provided with a compression chamber,
in which the material to be pressed is contained. At the end of, or within the
compression chamber is a plate or block perforated with holes of any desired shape
through which the material is forced under pressure, by the ram of an hydraulic
or other press against a thrust block fixed or moveable the face of which is either
a flat surface or contains countersunk impressions or designs raised or hollow into
and against which the substance being moulded is forced.
TA
1001
H. J. CHAPPELL.
COMPLETE SPECIFICATION.
Improvements in Machines for Pressing and Moulding Plastic
Materials.
I HENRY JAMES CHAPPELL of 26 Blythwood Road Crouch Hill in the
County of Middlesex 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 has for its object a means whereby greater density may be
imparted to plastic materials or semi-molten metals during the process of moulding
than has hitherto been obtained.
According to this invention the press is provided with a compression chamber in
which the material to be pressed is contained.
At the end of, or within the compression chamber is a plate or block perforated
with holes of any desired shape through which the material is forced under pressure
by the ram of a hydraulic or other press against a thrust block fixed or moveable
the face of which is either a flat surface or contains countersunk impressions or
designs raised or hollow into and against which the substance being moulded is
forced.
Referring to the accompanying drawing-
Fig. 1 is a sectional plan of my machine arranged to be worked by hydraulic
power, A being a hydraulic cylinder and B a ram having near its centre a piston
flange C to enable the ram to be withdrawn after completion of a forward stroke.
D is a compression chamber, circular or made in any other shape within which the
ram B works, this is secured to the body of a hydraulic or other press and
contains a die plate or moulding box E in which the material to be worked receives
its shape. F is a moveable thrust block having a plain surface or provided with
countersunk or raised impressions or designs, corresponding or not with the moulds
in die plate E, hinged at G, or made to slide away from the compression chamber
and held in position for receiving pressure by a screw H or by wedge or lever
and clips.

page_text: The material to be pressed and moulded is placed in the compression chamber D
and enclosed, and upon pressure being applied by the movement of the ram, tlie
material under treatment is forced through the apertures in the die plate E against
the thrust block F, pressure is then continued until the necessary compression is
obtained when the thrust block is withdrawn and the material being operated is
delivered outwards by the further movement of the ram in the direction of
pressure.
The die plate E is made moveable from the compression chamber or it may be
attached to the end of it, and the thrust block may contain raised or countersunk
designs.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be carried into effect, I declare
that what I claim is,
1. In an enclosed cylinder or chamber of any form within which plastic materials
are pressed into shape, the combination of a die, die plate or moulding box,
substantially as shown and described.
2. In a machine having a compression chamber, the combination of a die plate or
moulding box attached to the compression chamber in any position, substantially as
shown and described.
3. In a press of any kind worked by hydraulic or other power, the combination
of a compression chamber, containing within itself or having attached to it a die
plate or moulding box, fixed or moveable, substantially as shown and described.
4. In a press of any kind, the combination of a fixed or moveable swinging or
sliding thrust block which receives the pressure produced by a ram or piston
actuated by hydraulic or other power, substantially as described and shown.
Dated this 31st day of March 1892.
H. J. CHAPPELL.