THE NEW STEAM STAMP MILL
Year: 1899

page_text: We, THE NEW STEAM STAMP MILL SYNDICATE, LIMITED, and CHARLES SPENCER
MADAN, Engineers, both of 34, Crowther Street, Salford, in the County of
Lancashire, do hereby declare the nature of this invention to be as follows:-
This invention relates to the mortar boxes used in ore stamping mills, and
has for its object to provide a form of mortar box in which the ore will be more
efficiently treated than in the present forms, and require a less volume of water
service. In stamp boxes of the older forms the ore falls through the feed open-
ing directly upon the die at the base thereof in a heap and so temporarily
shortens the stroke of the stamp and destroys a portion of its effective work,
also the pulverised or partly pulverised one falls into and clogs the narrow
space between or about the die and the walls of the box, and much splashing
always takes place.
According to our improvements we construct the feed orifice and channel of
such shapes respectively as to present at least two inclined surfaces whereby the
falling ore is checked in its descent and directed in such manner as to be more or
less evenly distributed over the die instead of falling in a heap thereupon as
above explained. To this end the rear wall of the feed channel just below the
entry orifice is formed with a rearward incline, and a forward incline is formed
at its base gently curving down into the box. The front wall of the channel
(which is the rear wall of the box) is curved outwardly towards the channel above
the delivery opening, and by the combined effects of these configurations the
above result is attained. We also make the lower part of the box adjacent to
the die of such size and configuration that the pulverised ore cannot remain in
the adjacent spaces, but is freely washed thereout of and about the box; thus
the box clears itself with a less quantity of water service and the peculiar form
of the feed orifice and channel constitutes an effective splash trap, and so reduces
splashing.
Doted this Vinth day of January 1800
We, THE NEW STEAM STAMP MILL SYNDICATE, LIMITED, and CHARLES SPENCER
MADAN, Engineers, both of 34, Crowther Street, Salford, in the County of
[Price 8d.]

page_text: Lancashire, 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:-
-
This invention relates to the mortar boxes used in ore stamping mills, and
has for its object to provide a form of mortar box in which the ore will be more
efficiently treated and washed than in the present forms, and require a less
volume of water service. In stamp boxes of the older forms the ore falls through
the feed opening directly upon the die at the base thereof in a heap and so
temporarily shortens the stroke of the stamp and destroys a portion of its
effective work, also the pulverised or partly pulverised ore is liable to clog the
narrow space between or about the die and the walls of the box.
We will describe our improvements in reference to the accompanying drawing
in which the figure is a vertical section through our improved mortar box and
feed channel.
According to our invention we construct the feed orifice 1 and feed channel 2
of such shapes respectively as to present at least two inclined surfaces whereby
the falling ore is checked in its descent and directed in such manner as to be
more or less evenly distributed over the die 3 instead of falling in a heap there-
upon as above explained. To this end the orifice 1 is somewhat enlarged at
its top as shown and the rear wall of the feed channel 2 just below the said
entry orifice 1 is formed with a rearward incline 4; another similar but rather
less steep incline 5 is formed at the base of the channel gently curving at 6 down
into the box. These two similar inclines 4 and 5 are joined by the reversely
inclined portion 7 of the rear wall. The front wall 8 of the channel 2 (which
is the rear wall of the box) is curved outwardly as shown at 9 towards the
channel 2 above the delivery opening 10 to the box. Each of the inclines
referred to is or may with advantage be made at or about the angle of inclination
shown in the figure. By the combined effects of these configurations the ore in
its descent is checked somewhat by the inclines 4, 5 and 9, and is distributed
more evenly upon the die 3 in place of falling in a heap thereon as with the old
form of mortar boxes. Another result of this configuration is that the ore in
its passage over the incline 5 is thoroughly washed by the splashing and agitation
of the water in the box, and the box is cleared at once of the fine particles, so
reducing the production of slimes, and preventing clogging in the lower part of
the box by this means the box clears itself with a less quantity of water service,
and the peculiar form of the feed orifice and channel described constitutes an
effective splash trap.
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed, we declare that what
we claim is:
The improved form of mortar box for stamp mills with inlet orifice and channel
thereinto, in which two or more inclines are arranged to check the descent of
the incoming ore and distribute same evenly over the die and providing for a
more effective washing action within the box, substantially as and for the pur-
poses herein described and illustrated.
Dated this Fourth day of October 1899.
J. C. CHAPMAN,
Chartered Patent Agent, 70, Chancery Lane, London, W.C.