Improvements in Apparatus for the Manufacture of Cartridges of Explosive Substances for Blasting and similar Purposes.
Year: 1895

page_text: Date of Application, 9th Dec., 1895
Complete Specification Left, 21st May, 1896-Accepted, 27th June, 1896
IONAL OF MULTICATION.
Improvements in Apparatus for the Manufacture of Cartridges of
Explosive Substances for Blasting and similar Purposes.
1, FREDERICK RENDER, of Albert Street, Manchester in the County of
Lancaster, Corn Miller, do hereby declare the nature of this invention to be as
follows:-
This invention refers primarily to the manufacture of cartridges with nitrate of
ammonia of the Bellite class in which the material is not of a soft or sticky
nature.
It is designed with the object of providing mechanism whereby the cartridges
may be formed or filled without the material being handled by the workmen and
so avoid all deleterious effects produced by the handling of such substances.
In carrying out the invention I construct a machine with a long thin tube in
external diameter of the size the finished cartridge is required. Inside this tube
is fitted a forcing screw of any suitable shape or form by which the material is
carried through it entering at one end and being expelled at the other. This
tube is made of very thin steel as it forms the core upon which the wrapper or
envelope of the cartridge is formed.
Over this first tube a second tube fits or telescopes. The waxed paper (or other
material) which forms the wrapper or envelope for the cartridge is wrapped over
or around the first tube and lower edge folded over the bottom and is held in
position by the second tube which is placed over it.
Below the bottom of the tubes is placed a counterweighted or balanced table,
platform, plunger or the like capable of moving up and down which when raised
rests against the bottom end of the tubes. This table (or its equivalent) is pressed
away from the tube bottom by the material as it is forced through and emerges
therefrom and the pressure exerted by the table compresses the material. The
counterweight of the table may be altered or adjusted to exert greater or less
pressure upon the material and accordingly as the pressure exerted more or
less so will the cartridge be more or less dense. The table may be supported or
counterbalanced by weights, springs or by an elastic fluid.
The table is provided with an adjustable trip gear or other mechanism whereby
the machine is stopped when the desired length of cartridge has been forced out
of the first or inner tube and thus the length of the cartridge is regulated. The
cartridge is then removed from the machine inside the second or outer tube and is
retained therein during the baking process. Another wrapper and outer tube is
applied to the machine and the making of the cartridge continued.
At the upper or feed end of the first or inner tube is applied a hopper through
which the material is fed or supplied to the forcing screw and to the forcing screw
is attached differential or other gearing with worm wheel bevel friction or other
mechanism and a lever, trigger or the like for throwing it into and out of
gear.
Dated this 6th day of December 1895.
WM. P. THOMPSON & Co.,
6, Bank Street, Manchester, Patent Agents.

page_text: Improvements in Apparatus for the Manufacture of Cartridges of
Explosive Substances for Blasting and similar Purposes.
1, FREDERICK RENDER, of Albert Street, Manchester, in the County of
Lancaster, Corn Miller, 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 refers primarily to the manufacture of cartridges with nitrate of
ammonia and di-nitro-benzol of the Bellite class in which the material is not of a
soft or sticky nature.
It is designed with the object of providing mechanism by which the cartridges
may be formed or filled without the material being handled by the workmen and
so avoid all deleterious effects produced by the handling of such substances.
It consists essentially of apparatus constructed with a hopper and tube through
which the material is forced by a screw preferably a double threaded one through a
second tube to enclose the first which holds thereon an envelope or wrapper of
waxed paper or other material and a counterweighted or balanced table or plunger
which presses against the material as it issues from the machine to give the
cartridge the required degree of density.
It will be fully described with reference to the accompanying drawings in which
as an example a machine with four heads is illustrated.
Fig. 1. Front elevation with parts in section.
Fig. 2. Side elevation partly in section.
Fig. 3. Plan with parts in section.
Each head of the machine is of similar construction and I will describe the
invention with reference to one it being understood that there may be any desired
number of heads.
The apparatus is constructed on an upright framing comprising an upright
pillar A legs a and table B. The pillar A is clamped or otherwise affixed to the
table B and is capable of adjustment.
To the pillar AI affix a hopper C and tube D through which passes a forcing
screw E by which the explosive material placed in the hopper is carried through
and delivered at the other end. The hopper C is fed from cylindrical vessels F
into which the explosive material is carried and the inlet to hopper C is provided
with a loose valve c by which it may be opened or closed. The valve is made
with male and female end to fit onto cylindrical vessels and into hopper C so that
the lid of vessel F being removed all dust is confined in and excluded from entering
said vessel by placing the valve upon it instead of the cover.
The tube D is preferably made of thin steel the external diameter and the length
of which respectively correspond with the diameter and length of the finished
cartridge. This tube D forms the core upon which the wrapper or envelope of
the cartridge is formed.
Over the tube D a second tube or carrier G fits or telescopes. The waxed
paper (or other material) which forms the wrapper or envelope for the cartridge is
wrapped over or around the first tube with its lower edge folded over the bottom
and is held in position by the second tube which is placed over it.
Below the tube D I place a counterweighted or balanced table or plunger H
capable of sliding up and down which is pressed or forced upwards and which when
raised rests against the bottom end of the tubes D and G. The plunger H is
mounted on a sliding rod or spindle and is constantly pressed or forced upwards
by the weights K or by springs or their equivalent. The explosive material as it
is forced out of the tube D by the forcing screw E presses against the tube or
plunger H and causes the latter to recede the presusre exerted by the table or

page_text: plunger compressing the material. The counter weight of the table may be
altered or adjusted to exert greater or less pressure upon the material and
accordingly as the pressure exerted is more or less so will the cartridge be more
or less dense.
The forcing screw E is driven by means of a worm e and worm wheel e' actuated
by gear wheels which can be readily thrown out of gear to stop the rotation of
the screw.
The table is provided with an adjustable trip gear comprising the
rod L and spring lever L¹ which by means of a fork engages with the gear
wheel thus by the movement of the lever L' the wheel is thrown out of gear
with the wheel l. When the wheels are in gear the spring lever L' is held in
position by the end of the rod L.
When the desired length of cartridge has been forced out of the tube D the
table or plunger H engages with an adjustable collar on the rod L and draws
it down releasing the spring lever L' and stopping the machine. Thus the size or
length of the cartridge is determined. The cartridge is then removed from the
machine inside the second or outer tube and is retained therein during the baking
process. Another wrapper and outer tube is applied to the machine and the making
of the cartridge continued.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I now declare that what
I claim is :-
:-
1. An apparatus for manufacturing cartridges of explosive material constructed
with an inner tube upon which is formed or placed the cartridge case through
which the material is forced an outer tube or carrier which holds the wrapper or
cartridge case in position and a counterweighted table or plunger which presses.
against the cartridge as it is formed to give the required length and degree of
density substantially as described.
2. Apparatus for manufacturing cartridges having the several parts constructed
and arranged in combination substantially as described and shown.
Dated this 9th day of May 1896.
WM. P. THOMPSON & Co.,
Manchester, Liverpool, and London, Patent Agents.