An Improved Form of Stamping-heads and Dies or Anvils on which the Heads Beat for the Purpose of Crushing Metaliferous Ores.
Year: 1899

page_text: Date of Application, 17th Aug., 1899
Complete Specification Left, 12th May, 1900-Accepted, 23rd June, 1900
An Improved Form of Stamping-heads and Dies or Anvils on which
the Heads Beat for the Purpose of Crushing Metaliferous Ores.
I, JAMES GILBERT DAW, of 2, Goring Road, Llanelly, in the County of Car-
marthen, Engineer, do hereby declare the nature of this invention to be as
follows:-
This invention consists in making a hole either by casting or drilling in each
stamping-head & die or anvil which shall extend for all the length or portion
of the length of the stamping-heads, dies or anvils for the purpose of making
the crushing surfaces of the heads & dies work more evenly & effectually, as
this invention will prevent the formation of centre lumps owing to the crushing
faces being annular.
1
1011
Л
1000
An Improved Form of Stamping-heads and Dies or Anvils on which
the Heads Beat for the Purpose of Crushing Metaliferous Ores.
I, JAMES GILBERT DAW, of 2, Goring Road, Llanelly, in the County of Car-
marthenshire, Engineer, do hereby declare the nature of my said invention, and
in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement:-
My invention consists in making a hole either by casting, drilling, punching
or otherwise forming in each stamping-head and die or anvil, which shall extend
for all or for a portion of the length of the same, for the purpose of making
the crushing surfaces of the said heads and dies work more evenly and effectually
as my invention will prevent the formation of centre lumps owing to the crushing
surfaces being annular.
My invention will be better understood on reference to the accompanying
sheet of drawings in which,
Fig. 1 represents a head and die as usually made.
Fig. 2 represents a section of the same head and die after it has become
worn by use.
Fig. 3 represents a head and die as made by my improved method, showing,
in dotted lines, a hole extending centrally the full length of both the head and
the die.

page_text: Fig. 4 represents a section of the head and die made by my improved method,
after the same has become worn by use.
The same letters refer to similar parts throughout the several views.
A, is the head and b, is the die, c, and c¹, are the holes formed in the same
by my improved form of construction.
C
The head and die illustrated in Fig. 1, are found in practice to wear in a
conical form as shown in Fig. 2, through the material which has to be crushed
or stamped, being fed from the outside, and as the heads turn a portion of a
revolution at each lift, it is evident that the wear would commence on the sur-
faces nearest their peripheries, and the turning movement of the head would
cause the wear to proceed with a certain degree of uniformity until the actual
crushing surface for reducing the ore to sufficient fineness is limited to a least
possible area at about the centre of the crushing surfaces.
By employing heads and dies of my improved construction as shown in Fig. 3,
with hollow centres, the crushing surfaces will have a tendency to wear down
round the edge of the hole as well as round the peripheries, as shown in Fig. 4,
and in this manner instead of the area of actual contact being reduced to the
area of the apexes of the cones as shown in Fig. 2, the improved head and die
will have a ring of actual contact of greatly increased area, and consequently
they must perform more work. In some cases the central holes may be filled
up with wood or other suitable material.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is-
1. In stamping-heads and dies or anvils, employed for stamping and crush-
ing metaliferous ores, making or forming a hole in each head and die, which
shall extend for all the length or for a portion of the length, in the manner and
for the purposes substantially as herein described and illustrated, in Figs. 3,
and 4, of the accompanying sheet of drawings.
Dated this 4th day of May 1900.
R. HEBER RADFORD,
Agent for the Applicant.