AIR CUSHIONED HAMMER OR STAMPER
Year: 1885

page_text: I, WILLIAM HUSBAND of Hayle, in the county of Cornwall, Engineer, do hereby
declare the nature of my invention for "AIR CUSHIONED HAMMER OR STAMPER "
to be as follows:-
-1
My invention relates to a stamper for crushing ores and other materials so
arranged that the working parts are pneumatically relieved from the shocks to
which they would otherwise be exposed in the working of the apparatus.
I will describe a double stamper such as may be used for crushing ores arranged
according to my invention referring to the accompanying drawings, Fig. 1 is a
front view and fig. 2 is a side view, both partly in section. On a double frame
A A, I mount in bearings a shaft B which is caused to revolve by a band and
pulley or otherwise from any suitable motor. On each end of the shaft B is a
crank C which is connected to a piston D fitted within an oscillating air cylinder E
mounted by trunnions F on a vertically guided sliding frame G to which is
attached the stamper head H working within a coffer J, which may be of any known
kind and which being no part of my present invention is shewn merely in outline.
The piston rod which is jointed to the crank is made in two parts connected by a
screwed sleeve K through a slot of which is driven a key between the ends of the
two parts; by unscrewing and re-screwing the sleeve K and using a narrower or
wider key, the length of the rod can be varied so as to raise or lower the head H.
The piston D as well as its rod, is grooved to receive packing rings to prevent
leakage, the rod being fitted to work in a long sleeve projecting from the cylinder
lid. The rod however might work through a stuffing box packed with asbestos.
Immediately above and below the piston Ď, when it is in its middle position, there
are a number of small air holes e through the cylinder. When the piston passes
these holes in either direction there is enclosed above or below it a cushion of
air which becomes compressed giving impetus to the stamper frame and head, and
forming an elastic buffer between them and the connection to the crank shaft. It
is preferred to fit the crank pin in a crank disc C keyed on the shaft B, this disc
being made with two or more holes at different radial distances from the centre so
that, by shifting the crank pin from one to the other, the stroke of the piston D
can be varied. The two cylinders and stampers, instead of being placed outside
the frames A. A might be arranged within the frames, the cranks being in that case
formed on the shaft between its bearings. Also instead of two sets of cylinders
and stampers, a single set might be arranged between the frames.

page_text: To prevent oil from getting down to the materials in the coffer J, I provide a
catch cup. around the stamper rod and catch cups M under the guides of G. The
apparatus described may obviously be used as a hammer, in which case the coffer J
is dispensed with and a suitable anvil or block is employed to sustain the blows of
the head H.
Having now particularly described and ascertained the nature of my inven-
tion and in what manner the same is to be performed, I declare that what
I claim is
1, The construction of hammer or stamper substantially as described and shewn
by the drawings.
2, In a hammer or stamper, an oscillating air cylinder in combination with its
packed piston rod working in a long sleeve.