Improvements in Apparatus for Crushing and Screening Stones, Ores, and the like.
Year: 1896

page_text: PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Crushing and Screening Stones,
Ores, and the like.
We JAMES EDWARD BROADBENT and JOSEPH BROADBENT, both of Phoenix Iron
Works, Stalybridge, in the County of Chester; Managers, do hereby declare the
nature of this invention to be as follows:-
This invention relates to combined apparatus for crushing and screening stones
ores and the like, the principal object being to render the machine more efficient
and convenient than heretofore.
The invention consists in so constructing the screening mechanism that the stone
ore or the like which is raised from the crushing mechanism by a suitable elevator
is passed through two screens, the first screen sloping back towards the breaker
and returning all the pieces too large to pass through directly into a shoot and
back by gravitation to the crushing mechanism, and the second screen sloping in
the opposite direction and delivering the stone or ore passed through the tirst screen
in assorted sizes.
We arrange the elevator between the two screens so that the shoot from the
lower end of the upper screen to the crushing apparatus can be vertical or nearly
so, and clear space is left to feed the crushing mechanism.
We further provide the last named shoot with means for closing the same until
a certain amount of stone or ore has accumulated therein, and then opening the
same and allowing the whole accumulation to fall at once to the crushing apparatus,
and by this means the pieces of stone or ore which have already passed once
through the crushers will be more certainly crushed when returned to the said
crushers.
From the above description it will be further understood that no mechanical
conveyor will be required to return the large pieces of stone or ore to the crusher.
Dated this 15th day of July 1896.
GEO. DAVIES & SON,
4, St. Ann's Square, Manchester, Agents for the Applicants.
Improvements in Apparatus for Crushing and Screening Stones,
Ores, and the like.
We JAMES EDWARD BROADBENT and JOSEPH BROADBENT, both of Phoenix Iron
Works, Stalybridge, in the County of Chester, Managers, 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 combined apparatus for crushing and screening stones ores
and the like, the principal object being to render the machine more efficient and
convenient than hitherto

page_text: The invention consists in so constructing the screening mechanism that the stone,
ore, or the like, which is raised from the crushing mechanism by a suitable elevator is
passed through two screens, the first screen sloping back towards the breaker and
returning all the pieces too large to pass through, directly into a shoot and back by
gravitation to the crushing mechanism, and the second screen sloping in the opposite
direction and delivering the stone or ore passed through the first screen in assorted
sizes.
Our invention will be readily understood from the following description on reference
to the accompanying drawings of which
Fig. 1 is a side elevation, and Fig. 2 a plan of apparatus for the above purposes
constructed according to our invention.
Fig. 3 is an elevation of the elevator end of the screening apparatus the elevator
itself not being shewn.
We arrange the elevator between the two screens b and c, or we otherwise arrange
the elevator a and the supply shoot a 1 therefrom with regard to the screens b and c,
see Fig. 1, which slope down in reverse directions, in such a manner that the shoot 61
from the lower end of the upper screen b to the crushing apparatus can be
vertical or nearly so, see Figs. 1 and 2, and clear space is left to feed the crushing
mechanism d.
We further provide the last named shoot 61 with means for closing the same until a
certain amount of stone has accumulated therein, and then opening the same and
allowing the whole accumulation to fall at once to the crushing apparatus, and by this
means the pieces of stone or ore which have already passed once through the crushers
will be more certainly crushed when returned to the said crushers.
For this purpose we prefer to employ a damper or plate 62 at the lower end of the
shoot which is lifted at intervals by a lever 63 b4 the end of the arm b4 being
preferably provided with a bowl at b5 against which a tappet 6 at the end of the
shaft of the screen comes into contact to open the end of the shoot & and let the
accumulated stones fall therefrom to the crushing apparatus d. The stones or ore
passing through the screen 6 fall into the shoot e and thence into the lower screen c
which delivers them in sorted sizes as usual in the compartments see Fig. 2.
From the above description it will be further understood that no mechanical
conveyor will be required to return the large pieces of stone or ore to the crusher.
We do not confine ourselves to the exact details shewn on the accompanying
drawings and described with reference thereto as such may be varied, for example the
screen b may be made conical in form and be mounted on a horizontal axis instead of
being cylindrical and mounted on an inclined axis as shewn.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is
1. The combination of elevator and screens in such a manner that all the pieces of
stone or ore too large to pass through the first screening device are delivered
therefrom directly into a shoot and back to the crusher without any mechanical
conveyor, the aforesaid first screening device sloping downwards towards the crusher
and the second screening device sloping in the reverse direction to deliver the stones or
ore in assorted sizes, substantially as hereinbefore described.
2. The combination with the shoot for returning the large stones or ore to the
crusher, of means for closing the outlet of the said shoot and opening the same at
intervals substantially as and for the purposes hereinbefore described.
Dated this 11th day of April 1807
GEO. DAVIES & SON,
4, St. Ann's Square, Manchester, Agents for the Applicants.