Improvements in Pneumatic Stamps for Crushing Ores and other Material.
Year: 1894

page_text: Date of Application, 4th July, 1894
Complete Specification Left, 4th Apr., 1895-Accepted, 18th May, 1895
PROVISIONAL SPECIFICATION.
Improvements in Pneumatic Stamps for Crushing Ores and other
Material.
We DENIS EMBLETON of The Yorkshire Foundry, Leeds, in the County of
York, Mechanical Engineer, and GILBERT GLOSSOP of 13 Greemount Street,
Beeston Hill, Leeds in the County of York Mechanical Engineer do hereby declare
the nature of this invention to be as follows:-
Our invention refers to pneumatic ore stamps, and has for its object the construction
of the stamps in such a manner as to ensure less wear, tear and liability to fracture,
increased speed, and a reduction in the power required to drive the stamp, and the
possibility of readily varying the character of the blow to suit the nature of the
ore or the material to be crushed.
A pneumatic stamp constructed in accordance with our invention comprises a
cylinder, provided with slides fitting in guides formed in or attached to the frame
of the stamp. A rapid vertical reciprocating motion is imparted to the cylinder by
means of a crank working in a horizontal slide conveniently formed in or attached
to the cylinder top. At about the middle of its length an aperature open to the
air is formed in the side of the cylinder, and a similar aperature capable of being
opened or closed to any desired extent by means of a tap provided at the upper
eud of the cylinder.
The vertical stamp shaft is provided with at its upper end with a piston, fitting
and moving up and down in the aforesaid cylinder; whilst the stamp head is
attached to the lower end of the vertical stamp shaft. Both ends of the cylinder
are closed with covers.
A slow rotation is imparted to the stamp shaft by means of a ratchet wheel,
provided with a keyway, embracing the stamp shaft; the latter being provided with
a long key or feather. The ratchet wheel is provided with a boss fitting in
bearings fixed to a cross bracket between the standards or A frames of the machine..
The ratchet wheel is actuated from the aforesaid main crank shaft by means of a
belt, driving a short counter shaft, on the end of which is fitted a cam working in
the slotted arm of a bell crank lever, the second arm of the bell crank lever
being connected to the pawl lever of the aforesaid ratchet wheel by means of a
short link.
In order to be able to stop the motion of the stamp shaft and head and to hold
the latter at the top of the stroke to enable the ore box to be cleaned out without
stopping the first mentioned main crank shaft, which is especially desirable in the
case of a battery of stamps, we provide the following mechanism. At a short
distance above the top of the ore box we provide a fixed cross bracket, in
which is fitted a split bush forming a guide for the lower end of the stamp shaft,
and by means of a screw acting against one or on both halves of the bush, these
can be drawn together so as to stop the motion of the shaft without arresting that
of the cylinder.
The rotation of the stamp shaft may also be effected by the reciprocation of a
lever, carrying a runner bearing against or fitting in a cam attached to the
(moving) cylinder; the said lever being mounted at the upper end of a vertical
shaft carrying a pawl lever at its lower end engaging with the before-mentioned
ratchet wheel.
In order to allow of the rotation of the ratchet wheel when the movement of the

page_text: vertical stamp shaft is stopped as above mentioned, we insert a bush provided with
a keyway between the stamp shaft and the ratchet wheel and a leather friction or
slipping disc between the ratchet wheel and the said bush, which can be tightened
up or slackened by means of a screw or screws.
By varying the shape of the before-mentioned cam (attached to the cylinder)
the rotation of the stamp shaft may be caused to occur at any desired portion of
the stroke.
Dated this 30th day of June 1894.
J. CLARK JEFFERSON,
2, East Parade, Leeds, Agent for Applicants.
COMPLETE SPECIFICATION.
Improvements in Pneumatic Stamps for Crushing Ores and other
Material.
We, DENIS EMBLETON, of The Yorkshire Foundry, Leeds, in the County of
York, and GILBERT GLOSSOP, of 13; Greenmount Street, Beeston Hill, Leeds,
aforesaid, Mechanical 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 :-
Our invention refers to pneumatic ore stamps, and has for its object, the con-
struction of the stamps in such a manner as to ensure less wear, tear and liability
to fracture, an increased speed of the apparatus, and a reduction in the power
required to drive the stamp and the possibility of readily varying the character or
force of the blow to suit the nature of the ore or other material to be crushed.
In describing our invention in detail, reference is made to the accompanying
drawings in which
Fig. 1 represents a front elevation of a pneumatic stamp, constructed according to
our invention, a portion of the standard frame is cut away to show the brake
apparatus which is in section.
Fig. 2 is an elevation partly' in section of the stamp at right angles to the other
view.
The remainder of the figures are detached details and are hereinafter referred to.
In all, similar letters indicate similar parts where they appear.
The pneumatic stamp as constructed according to our invention, comprises a
cylinder A. provided with slides B. fitting in guides C. formed on or attached to
the standard frames D. of the apparatus.
A vertical reciprocating motion is imparted to the cylinder A. by means of a
crank E. on rotating shaft E' working in a block F. mounted and sliding in
horizontal space G. formed on or attached to the cover or top portion of the before
mentioned cylinder as shown by Fig: 3.
Both ends of the cylinder A. are closed with suitable covers and at about the
middle of the length of the said cylinder is an aperture H. open to the air, and a
similar aperture capable of being opened or closed to any desired extent, by means
of separate plugs having holes of different diameters through same is provided at J.
at the upper end of the cylinder, or a tap may be utilized for the purpose as shown
at K. in Figs. 9. 10 and 11, the said tap being opened or closed by the operation of
the lever and sliding bar K'. A similar opening is also formed in the bottom end
of the cylinder on the underside of the piston and is fitted with an automatic
opening and closing snifting" or back pressure valve of the ordinary description,
and with a tap at K³..
The vertical stamp shaft L. is provided at its upper end with a piston M. fitting
in and moving up and down in the before mentioned cylinder A. whilst the stainp
head is attached to the lower end of the vertical stamp shaft.

page_text: A slow rotation is intermittently imparted” to the stamp shaft L. by means of a
ratchet wheel O. mounted on the said stamp shaft which is provided with a
feather key.
The ratchet wheel O. is prepared with a boss' Q. through which a keyway is cut
for the reception of the feather key P. and is supported by a cross bracket R. such
as shown by Fig. 4 bolted to the standard frames D. of the apparatus. The
operation of the ratchet wheel O. may be effected by means of a belt from a small
pulley S. on shaft. El engaging with a pulley S', thereby driving a short counter
shaft T, on one end of which is a crank pin engaging with a sliding block working
in a slot hole U. formed in one arm of a bell crank lever V. the other arm of the
said lever being connected to a pawl lever W. by a link X. thus by the
rotation of the counter shaft T. and the engaging of the pawl W. with the ratchet
wheel O. an intermittent rotating motion is imparted to the stamp shaft L. and
connections thereto.
It will be obvious to persons conversant with the stamping of ores and the like
that, when the crank shaft E' is of such length as to extend over a battery of
stamps, the importance of being enabled to stop any one of the stamps in the said
battery, and to hold the stamp shaft L. and stamp head N. up at the top, or
upper portion of the stroke as long as may be desired, for allowing the ore box Y.
to be cleaned out, and to leave the other stamps running; we provide mechanisot
as hereinafter described and referred to in the drawings.
Above the ore box Y. we secure a bracket Z. represented in plan by Fig. 5 in
which is fitted a split bush 1. forming a guide for the lower end of the stamp
shaft L. and by means of a screw 2. acting against one half of the bush as shown,
or by a similar screw acting on the other half of the bush, they can be forced
together so as to bind the stamp shaft L. and stop the motion of the said shaft and
stamp head N. without arresting the motion of the cylinder A.
The intermittent rotation of the ratchet wheel O. and stamp shaft L. may also
be effected by the reciprocation of a lever 3. carrying a small pulley or runner 4.
held in contact with the surface of a cam plate 5. by a spring 6. arranged somewhat
as shown by Fig. 6 representing a plan of the modified arrangement along with a
portion of the cylinder A. The lever 3. is mounted on the upper end of a vertical
shaft 7. and to its lower end is secured a pawl lever 8, the pawl 9. engaging with
the before mentioned ratchet wheel. It will be understood by the movement of
the irregular surface of the cam plate 5. over the runner 4. the shaft 7. is oscillated
in its bearings, and the pawl 9. engaging with the teeth of the ratchet wheel O.
operates the same and rotates the stamp shaft L. a certain distance each stroke of
the piston. Figs. 7 and 8 both partly in section, represent elevations of our
modified arrangement.
In order to allow of the rotation of the ratchet wheel O. when the vertical stamp
shaft L. is stopped by the gripping of the split bush 1. we insert a bush or sleeve 10.
between the stamp shaft L. and ratchet wheel O. provided with a keyway which
engages with the feather key P. in stamp shaft L. Between a collar or flange 11.
on the said bush or sleeve and a plate 12. free thereon, we insert a leather or other
suitable flexible washer as slipping disc 13. which, on being compressed by
tightening the bolts 14. sufficient friction is obtained between the flange 11. and
plate 12. as will turn the stamp shaft L. when free in the split guiding
bush 1.
It will be obvious that by the reciprocation of the cylinder A. and inserting
interchangeable plugs J. with different sizes of holes, or regulating tap K. and
adjusting the size of the opening through tap K' at the bottom, the air admitted
into the cylinder through the hole H. to the top of the piston M. and by the
covering of said. hole and automatic action of the ordinary back pressure valve
to the underside of the piston, the air in the cylinder is compressed more or less at
the respective ends of the cylinder; say for example, when the cylinder is
descending and the top side of the piston M. covers the hole H, then the air in
the top portion of the cylinder A. is compressed and gives force to the blow

page_text: imparted to the stamp head N. corresponding to the amount of compression on the
top of piston M. and area of opening or freedom of escape of air through the tap K*
in the bottom of cylinder.
On reducing the size of opening through the plug J. or tap K. and opening that
through tap K' at the bottom of cylinder A, the force of the blow is increased, or
on increasing the size of opening through plug J. or tap K. and reducing that
through tap K' then the force of the blow is reduced to an extent as may be
found desirable for crushing the kind or condition of ore under operation.
Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed, we declare that what we
claim is:
1. In an ore stamping machine the combination with a reciprocating air com-
pressing cylinder A. of a stamp shaft L. guided by a pair of split bushes 1. applied
in the manner and operated substantially as shown and described and for the
purpose as herein before set forth.
2. In an ore stamping machine, the combination with a reciprocating stamp
shaft L. of a ratchet wheel O. operated at intervals in a manner so as to turn
or twist the said stamp shaft and thereby change the position of the face of the
stamp head N. in relation to that of the anvil at the bottom of the ore box.
3. The general arrangement and combination of parts forming the complete
apparatus constructed and operated substantially in the manner as herein before
set forth.
Dated this 3rd day of April 1895.
JOHN WAUGH,
Agent.