Improvements in or connected with Stamp Mills.
Year: 1894

page_text: Date of Application, 9th Jan., 1894
Complete Specification Left. 9th Oct., 1894-Accepted, 10th Nov. 1894
PROVISIONAL SPECIFICATION
Improvements in or connected with Stamp Mills.
I, FRANCIS BARTLE, of Basset Foundry, Carn Brea, in the County of Cornwall,
Engineer and Iron Founder, do hereby declare the nature of this invention to
be as follows:-
or
My invention relates to stamp mills for crushing ores and for similar purposes and
has for its object to reduce the friction of the moving parts as much as possible.
According to my invention I improve the construction of the tappets which are
secured to the stems or lifters of the stamps and against which the cams
projections upon the driving shaft act, by providing that part of each tappet against
which the operating cam bears with a friction roller or rollers in such a manner
that the cam will come in contact with the said roller which will consequently more
or less rotate and thereby cause less friction than if the cam simply rubbed against
a solid or rigid tappet.
The roller may be mounted in any suitable manner, for instance, upon a pivot
extending through the tappet.
It is necessary with this roller to provide good lubrication; this I advantageously
accomplish by forming in the roller a hole or recess which may be filled with
lubricant.
Tappets constructed as hereinbefore described are by preference made detachable
from the stamp-stems or lifters, each tappet having a hole to receive the stem, the
said hole being made of sufficient size that after the tappet is upon the stem a
wedge or wedges may be introduced to fix the tappet in position.
In order to reduce the friction of the stamp-stems or lifters in their guides the
said guides are composed of pairs of rollers preferably flanged so as to embrace
the stems or lifters and support them laterally. The shafts carrying the rollers are
preferably supported in the side frames of the apparatus and secured by keys or by
any other suitable means.
Dated the 9th day of January 1894.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.
Improvements in or connected with Stamp Mills.
I, FRANCIS BARTLE, of Basset Foundry, Carn Brea, in the County of Cornwall,
Engineer and Iron Founder, 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 :-
My invention relates to stamp mills for crushing ores and for similar purposes and
has for its object to reduce the friction of the moving parts as much as possible.
According to my invention I reduce the friction of the stamp-stems or lifters in
their guides by constructing the said guides with pairs of rollers preferably flanged
so as to embrace the stems or lifters and support them laterally. The shafts
D

page_text: carrying the rollers are preferably supported in the side frames of the
and secured by keys or by any other suitable means.
apparatus
I improve the construction of the tappets which are secured to the stems or
lifters of the stamps and against which the cans or projections upon the driving
shaft act, by providing that part of each tappet against which the operating cam
bears with a friction roller or rollers, in such a manner that the cam will come in
contact with the said roller or rollers which will consequently more or less rotate
and thereby cause less friction than if the cam simply rubbed against a solid or
rigid tappet.
Tappets constructed as herein before described are by preference made detachable
from the stamp-stems or lifters, each tappet having a hole to receive the stem, the
said hole being made of sufficient size that after the tappet is upon the stem a wedge
or wedges may be introduced to fix the tappet in position.
To enable my invention to be fully understood I will describe the same by
reference to the accompanying drawings, in which :-
Figure 1 is a side elevation of a guide constructed according to the invention for
guiding the stamp-stems or lifters of a stamp mill; and,
Figure 2 is a plan of the same:
Figure 3 is a section on the line 3-3, Figure 1:
Figure 4 is a similar view to Figure 3 illustrating a modification and,
Figure 5 is a side elevation illustrating another modification :
Figure 6 is a side elevation of a stamp mill tappet constructed according to the
invention and drawn to an enlarged scale and,
Figure 7 is a plan of the same.
Similar letters of reference indicate corresponding parts throughout the
drawings.
a, a are the stems or lifters of the stamps, and b, are the flanged rollers forming
the guides between which the said stems or lifters slide. These rollers are carried
upon the shafts c, c which at their ends are supported in the framing d of the stamp
mill by any suitable means. As shewn clearly in Figures 1 and 3 the said ends are
secured in horizontal slots e, e in the framing by means of keys f,f, whilst in
Figure 4 the said shafts have their ends supported in vertical slots, the shafts being
prevented from jumping therein by means of the rod f' passed through the framing
above the said shafts.
Instead of supporting the shafts in the manner described, they may be passed
through correspondingly formed openings in the ends of the frame in the manner
represented in Figure 5, pins y being passed through the shafts to prevent them
from moving laterally in the bearings.
The method of constructing the tappets and securing them to the stems or lifters
is represented in Figures 6 and 7, wherein h indicates one of the tappets. This
tappet is provided with an opening i which fits the lifter or stem a on three sides,
whilst on the fourth side a wedge jis introduced which serves to hold the tappet
firmly in position; one end of the said tappet is bifurcated and carries a roller k
upon a pin, the said roller being of greater diameter than the depth of the tappet
so that it will be struck by the operating cams during the working of the stamp.
In order to provide for lubricating the rollers k, I form in each of them a hole
or holes m, m which may extend directly to the pin 7 or to a receiver surrounding
the said pin and which will retain a small quantity of lubricant.
Having now particularly described and ascertained the nature of my said inveu-
tion and in what manner the same is to be performed, I declare that what i
claim is :-
1. In a stamp mill arranging the stems or lifters to slide between flanged rollers,
substantially as described.
2. In a stamp mill securing the tappets upon the stems or lifters by means of
wedges, substantially as described.

page_text: 3. In a stamp mill providing the tappets with rollers against which the cams act,
substantially as, and for the purpose, described.
Dated the 9th day of October 1894.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.