Year: 1898

page_text: We, FRANK FREEMAN and EDWARD SAMUEL BRETT, of Harnall Lane, Coventry, in
the County of Warwick, Mechanical Engineers, do hereby declare the nature of this
invention to be as follows :-
This invention relates to stamp-batteries adapted for use in crushing ore and
similar materials; our present improvements being specially applicable to stamp-
batteries wherein means of the kind described in the Specifications to Edward
Samuel Brett's British Patents Nos. 7354 of 1891 and 376 of 1897, are employed to
raise the several stamps instead of cams and tappets of the usual type.
In a stamp-battery constructed in accordance with our improved method, the
mortar box is of the ordinary "Homestake" pattern, and serves five stamps. In the
upper part of the mortar box is formed a water-chamber divided into compartments,
each of the latter serving as a water-casing and guide to one of the stamp rams.
The water-casings are bored about one-sixteenth of an inch larger than the diameter
of the rams, thus, whilst serving as efficient guides to the rams, affording sufficient
space to enable the water required for wet stamping to pass from the water-chamber
to the mortar box and in its passage to lubricate the ram guides. The constant
downflow of water prevents sand gaining access to the casings or guides.
The connection between each ram and its lifter is formed of wood or other
suitable non-metallic material and is attached at its upper extremity by means of
a swivelling shackle to a flexible strap which passes over a pulley on the lifter. The
swivelling shackle allows the stamp to rotate. By the employment of wood for
connecting the stamp head with the lifter a great deal of the vibration, so apparent
when steel stems are used, is done away with.
In order to afford means for compensating for the wear of the shoe and die, the
wooden connection for lifting the stamp head is furnished with two wrought iron
straps, arranged in such a manner that, on slackening them, the connection can be
readily lengthened or shortened at will.
With a view to effecting the rotation of the stamps, the, wooden lath or connector
is caused to pass through a guide the circumference of which is formed as a pitch-
wheel and is engaged with a pitch-chain. The pitch-chain receives motion from
any convenient source of power and is in connection with the several pitch-wheels.
pertaining to the stamps.

page_text: We, FRANK FREEMAN and EDWARD SAMUEL BRETT, of Harnall Lane, Coventry, in
the County of Warwick, Mechanical Engineers, do hereby declare the nature of this
invention and in what manner the same is to be performed, to be particularly de-
scribed and ascertained in and by the following statement:-
This invention relates to stamp-batteries adapted for use in crushing ore and similar
materials, our present improvements being specially applicable to stamp-batteries
wherein means of the kind referred to in the specifications to Letters Patent granted
to one of us, dated 29th April, 1891, No. 7354, and 6th January 1897, No. 376, are
employed to raise the several stamps instead of cams and tappets of the usual type.
Fig. 1 is a front elevation and. part vertical section of a five-stamp battery con-
structed according to our improved method, and Fig. 2 is a vertical section on a plane
at right angles to Fig. 1. Fig. 3 is a horizontal section on the line x-x, Fig. 2;
whilst Figs. 4 and 5 are views illustrating special features of the construction.
The mortar-box a is of the ordinary "Homestake" pattern, and serves five stamps.
The upper part of the mortar-box is formed as, or furnished with, a water-chamber b,
which is in communication with compartments or barrels 61, each of which serves as a
water-casing and guide to one of the stamp-rams c. The water-casings are bored
about one-sixteenth of an inch larger than the diameter of the rams; thus, whilst
serving as efficient guides to the latter, affording sufficient space to enable the water
required for wet stamping to pass from the water chamber 6 to the mortar-box a, and
in its passage to lubricate the ram-guides. The constant down-flow of water prevents
sand or grit passing in the opposite direction and gaining access to the casings or
guides. Water is supplied to the chamber 6 by way of the inlet 62,
The connection between each ram c and its lifter is formed of wood, or other suitable
non-metallic material, and is attached at its upper extremity by means of a swivelling
shackle d to a flexible strap d¹ the latter being attached to a cross bar which extends
between two levers d² d² mounted on either side of the pulley ds and keyed to the
lifter piston rod d. Upon the partial rotation of the lifter piston rod d' the flexible
strap d is wound about a portion of the pulley. The swivelling shackle allows the
stamp to be rotated. The lower extremity of the connection is wedge-shape and is
furnished with a metal shoe c¹ adapted to fit a recess in the upper extremity of the
ram c. The lower surface of the shoe c¹ is inclined and a wedge e² is driven into the
recess beneath the shoe; a pin c³ retaining the several parts in position. By
the employment of wood for connecting the stamp head with the lifter, a great deal of
the vibration, so apparent when steel stems are used, is done away with.
In order to afford means for compensating for the wear of the shoe and die, the
wooden connection for lifting the stamp head is made in two parts which are lap
jointed as shown at d; the contiguous surfaces being serrated to ensure engagement
whilst permitting of adjustment. The contact of the parts is maintained by two straps
or clamps do, arranged in such a manner that, on slackening them, the connection can
be readily taken apart and either lengthened or shortened.
With a view to effecting the rotation of the stamps, the upper member d* of the
connector is caused to pass through a guide e, the circumference of which is formed as
a pitch-wheel and is engaged with a pitch-chain f. The pitch-chain is in connection
with the several pitch-wheels pertaining to the respective stamps, and receives motion
from the pitch-pinion g carried by the vertical spindle g', the latter being furnished at
its upper extremity with a worm-wheel g², actuated by a worm g³ mounted upon the
shaft h. This shaft serves to operate the controlling valves of the several lifters in
the following manner. Upon the shaft h, in respect of each lifter, is secured a double
cam h¹ above which is arranged a lever h³ furnished with an anti-friction roller h³.

page_text: One extremity of the lever h² is connected with the spindle of the steam-controlling
valve h; whilst the opposite end is pivoted in a block h, which is mounted to slide in
a guide and is capable of adjustment in a vertical direction by means of a screw hº.
By raising the pivoted end of the lever h², the degree of steam admission is not only
diminished, but the time at which such admission takes place is made later. The
timing of the successive movements of the stamps may thus be regulated to a nicety;
primarily by the setting of the cams h¹ upon the shaft h, and secondarily by the
adjustment of the screws ho.
Having now particularly described and ascertained the nature of our said invention
and in what manner the same is to be performed, we claim :-
--
1. In a stamp-battery, providing each stamp with a water-lubricated guide,
arranged or operating substantially as herein described, whereby the tendency for
grit to pass from the mortar-box to the ram-guide is counteracted.
2. In a stamp-battery, the improved means, substantially as herein described, for
rotating the stamps; same comprising a lath or like Hattened connector, attached at
its upper extremity by means of a swivel to the lifter, and at its lower extremity to
the stamp, and passing, at an intermediate point, through a guide to which a slow
rotative movement is imparted and which is so formed as to rotate the lath.
3. A power stamp-battery, constructed and operating substantially as described
with reference to the accompanying drawings.
Dated this 17th day of March, 1899.
For the Applicants,
G. G. M. HARDINGHAM,
Chartered Patent Agent, Clun House, Surrey Street, London, W.C.