improvements in Machinery for Stamping or Reducing to Powder Quartz, Mineral Ores or other Hard Substances.
Year: 1888

page_text: improvements in Machinery for Stamping or Reducing to Powder
Quartz, Mineral Ores, or other Hard Substances.
We, CHARLES APPLEBY, and GEORGE EDWARD ABRAHAMS, both of Cannon Street,
in the City of London, Engineers, do hereby declare the nature of this invention,
to bo as follows:-
This invention relates to stamping machinery of the ordinary well known kind in
which stamps of sufficient weight are raised by means of cams upon a revolving shaft,
and are then allowed to fall upon the material to be pulverized.
It has for its object novel methods of construction by which the force of the blows
given by the stamps is increased, and a greater number of blows can be given in
any definite time, than if the stamps are allowed to fall by the force of gravity
only, as is usually the case.
For this purpose wo arrange and fix above each stamp a cylinder bored to receive
a piston which works in it airtight or nearly so, the piston being fixed upon the upper
end of the stamp spindle or upon a rod fixed to the latter, and the cylinder being
of sufficient length to allow the piston to travel the full longth of the stroke of the
stamp. We close the upper end of the cylinder by means of an air-tight disc or
piston fitting into it the height of which can be adjusted by means of a spindle
fixed to it and passing through or being screwed through a cover or crossbar at the
upper end of the cylinder, the position of the spindlo being fixed by one or more
nuts screwed upon it.
When the stamp head is raised by the cam which lifts it, the air above the piston is
compressed in the cylinder, so that when released by the cam the stamp head and
spindle are forced down by the compressed air at a speed and with a force much
greater than if they were allowed to fall by the force of gravity only. An opening or
valve may be arranged to admit air into the cylinder when the piston is at the bottom
of its stroke.
A helical spring may be arranged in the cylinder above the piston so as to aid by
ts elasticity the speed and force with which the stamp descends. Or the spring

page_text: may be used without the air cylinder and piston first described, arranged in any
convenient position as for instance between the lifter upon the stamp spindle and the
upper guide through which the latter works; or it may be used in such position in
combination with the air cylinder and piston. Where a piston is usel we preferably
connect the stamp spindle to it by a ball or universal joint, so that the spindle can
revolve independently.
By our invention the speed of the stamps is accelerated, and the force of the blows
increased, so that a larger amount of work is done than with such stamps as ordinarily
heretofore constructed, in which the force of gravity alone is used.
Dated this 3rd day of April 1888
EDWARDS & Co.,
35, Southampton Buildings, London,
Agents for the Applicants.

page_text: Quartz, Mineral Ores, or other Hard Substances.
We, CHARLES APPLEBY, and GEORGE EDWARD ABRAHAMS, both of Cannon Street,
in the City of London, Engineers, 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 and accompanying drawing (that is to
say) :-
Our invention relates to stamping machinery of the ordinary well known kind in
which stamps of sufficient weight are raised by means of cams upon a revolving shaft,
and are then allowed to fall upon the material to bo pulverized.
It has for its object novel methods of construction by which the force of the
blows given by the stamps is increased, and a greater number of blows can be given
in any definite time, than if the stamps are allowed to fall by the force of gravity only,
as is usually the case.
The accompanying drawing is in illustration of our invention, Figure 1 being a
vertical section and figure 2 a similar section of a somewhat different arrangement.
We arrange and fix above each stamp a cylinder a bored to receive a piston b,
which works in it air-tight or nearly so, the piston boing fixed upon the upper end of
the stamp spindle c or upon a rod fixed to the latter, and the cylinder a being of
sufficient length to allow the piston to travel the full longth of the stroke of the
stamp. We close the upper end of the cylinder a by means of an air-tight disc or
piston d fitting into it, the height of which can be adjusted by means of a spindle e
fixed to it and passing through or being screwed through a cover or crossbar at tho
upper end of the cylinder a, the position d of the spindle being fixed at the desired
height by one or more nuts screwed upon it.
When tho stamp head is raised by the cam which lifts it, the air above the piston b
is compressed in the cylinder a so that when released by the cam the stamp head and
spindle are forced down by the compressed air at a speed and with a force much
greater than if they were allowed to fall by the force of gravity only.
An opening or valve may be arranged to admit air into the cylinder when the piston b
is at the bottom of its stroke.
A helical spring may be arranged in the cylinder a as shewn at h in figure 2
above the piston 6 so as to aid by its elasticity the speed and forco with which the
stamp descends.
Or the spring may be used without the air cylinder a and piston b first described,
arranged in any convenient position as for instance between the lifter upon the stamp
spindle and the upper guide through which the latter works; or it may be used in
such position in combination with the air cylinder a and piston b.
Where a piston is used we preferably connect the stamp spindle to it by a
ball or universal joint as shewn at i figure 2, so that the spindle can revolve
independently.

page_text: By varying the position in which the pivot d is fixed, the amount of compression
of the air in the cylinder is also varied, as well as the force communicated to the
piston b to aid its downward stroke.
By our invention the speed of the stamps is accelerated, and the force of the blows
increased, so that a larger amount of work is done than with such stamps as ordinarily
heretofore constructed, in which the force of gravity alone is used.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what
we claim is :-
1. The combination with the spindle of a stamp, of the cylinder a, piston 6, and
adjustable piston d, substantially as and for the purpose described and shewn.
2. In combination with the spindle of a stamp, the spring h, with or without the
cylinder a and piston b, substantially as and for the purpose described and shown.
Dated this 3rd day of January 1889.