IMPROVEMENTS IN DIRECT-ACTING STAMPERS WORKED BY FLUID PRESSURE
Year: 1878

page_text: LETTERS PATENT to Frederick Edward Blackett Beaumont, of Westminster.
Palace Hotel, Westminster, in the County of Middlesex, for the Invention of
IMPROVEMENTS IN DIRECT-ACTING STAMPERS WORKED BY FLUID PRESSURE."
"
Sealed the oond Namba 1070
ALL
1979
Sealed the 22nd November 1878, and dated the 4th September 1878.
PROVISIONAL SPECIFICATION left by the said Frederick Edward Blackott
Beaumont at the Office of the Commissioners of Patents on the 4th September
1878.
FREDERICK EDWARD BLACKETT BEAUMONT, of Westminster Palace Hotel, West-
minster, in the County of Middlesex. "IMPROVEMENTS IN DIRECT-ACTING STAMPERS
WORKED BY FLUID PRESSURE."
My Invention relates to stampers employed for crushing ores or such like
operations, and consists in an arrangement of cylinder and slide in combination
with a stamping coffer and framing, such that the stamper is caused to reciprocate
rapidly by steam or compressed air acting in the cylinder, the reversals of move-
ment being effected by the action of the working fluid itself on the slide without
any extraneous mechanism for that purpose, and that the working fluid is cut off
when part of each stroke is effected, the remainder of the stroke being effected by
expansion. For this purpose on a framing above the coffer I mount a cylinder and
slide resembling in their construction the cylinder and slide described for working a
percussive rock drill in the Specification to Letters Patent granted to me on the 2nd
April 1874, No. 1140, with modifications described in the Specification to Letters
Patent granted to me and Joseph Foster on the 31st March 1876, No. 1390. I mount
the cylinder and slide in vertical guides, providing a screw or two scrows geared
together, by which they can be raised or lowered. To the piston rod I attach a striker,
which at each down stroke of the piston strikes the ore or material in the coffer,
effecting the stamping required. By raising or lowering the cylinder by means of the
[Pri

page_text: screw or screws above-mentioned the striker can be adjusted and wear can be taken up.
For the purpose of working expansively I arrange in the supply pipe to the slide a
double beat or nearly balanced stop valve connected to a differential piston in a
short cylinder. This cylinder communicates on its smaller side with the main steam
pipe and on its larger side with the main cylinder by a port arranged at the
required point of cut off, so that when the main piston in its down stroke passes the
port it admits fluid to act on the valve piston, closing the valve and so cutting off
the supply of working fluid; and again when the main piston makes its up stroke
the larger area of the small cylinder becomes open to exhaust through the main
cylinder, whereupon the valve opens for supply of fluid to effect the next stroke of
the main piston. The cut-off of the working fluid may also be effected by any of
the known methods for that purpose. The construction of the main cylinder and
slide may be varied as in known percussive rock drill arrangements wherein the
reciprocation of the piston is effected by a slide acted on by the working fluid, the
mounting and arrangement of such cylinder and the adaptation of the expansion
valve to it being as above described.