Improvements in Screens for Coals, Ores, and the like.
Year: 1891

page_text: Date of Application, 17th July, 1891
Complete Specification Left, 13th Apr., 1892-Accepted, 14th May, 1892
PROVISIONAL SPECIFICATION.
[Communicated from abroad by HEINRICH SCHÜCHTERMANN and CARL JOSEF
KREMER, of Dortmund, in the German Empire, Engineers.]
Improvements in Screens for Coals, Ores, and the like.
I, HENRY HARINGTON LEIGH, Assoc. M. Inst. C.E., Fel. Inst. P.A., practising
as Phillips & Leigh at No. 22, Southampton Buildings, Chancery Lane, in the
County of Middlesex, Engineer, and Patent Agent, do hereby declare the nature
of this invention to be as follows:-
This invention relates to improvements in screens for coals, ores, and the like,
and consists in a novel combination of bars and transverse rollers, all the latter
being rotated in one and the same direction by any suitable device or mechanism.
In carrying the invention into effect, a suitable frame is provided in which
the bars are fixed in the same plane and side by side, preferably longitudinally.
The transverse rollers-transverse that is with respect to the bars-have their
bearings in the sides of the frame and the distances between the bars and rollers
constitute the mesh of the screen.
For the purpose of rotating the rollers, the following mechanism is, preferably,
made use of, although it is to be distinctly understood that alternative or equivalent
gears may be applied.
Each roller carries a gear wheel and around these passes an endless chain. One
of the rollers carries a driving pulley.
COMPLETE SPECIFICATION.
Improvements in Screens for Coals, Ores, and the like.
I, HENRY HARINGTON LEIGH, Assoc. M. Inst. C.E. Fel. Inst. P.A.,
practising as Phillips & Leigh, at No. 22, Southampton Buildings, Chancery
Lane, in the County of Middlesex, Engineer and Patent Agent, 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 improvements in screens for coals, ores, and the
like; and consists in a novel combination of bars and transverse rollers, all
the latter being rotated in one and the same direction by any suitable device or
mechanism.
In carrying the invention into effect a suitable frame is provided in which the
bars are fixed in the same plane and side by side, preferably longitudinally.
The transverse rollers-transverse that is with respect to the bars-have their
bearings in the sides of the frame and the distances between the bars and rollers
constitutes the mesh of the screen.
For the purpose of rotating the rollers, the following mechanism is preferably
made use of, although it is to be distinctly understood that alternative or equivalent
gears may be applied.
Each roller carries a gear wheel and around these passes an endless chain. One
of the rollers carries a driving pulley.
In order that this invention and the best means of carrying it into practical effect
may be thoroughly understood, I will now describe it and them in detail, referring
1 Price 8d7

page_text: in so doing to the accompanying figures which are to be taken as part of this
Specification and read therewith.
Fig. 1 is a plan omitting the driving chain.
Fig. 2 is a side elevation.
Fig. 3 is a longitudinal section along the line 3-3 of Fig. 1.
Fig. 4 is a transverse section along the line 4-4 of Fig. 1 looking at the latter
from the right hand.
a is a stout rectangular frame. b, bare bars fixed therein at equal distances
from each other and parallel with the sides of the frame. c, care equidistant
rollers. They are placed at right angles with the bars b, and have their bearings
in the sides of the frame. Their journals are prolonged through one side and have
chain-pulleys d fast on them. e is an endless chain led round all the pulleys and
fis a driving pulley fast on a prolongation of one of the rollers. This pulley is
driven from any convenient source and its motion is communicated to all the
rollers c through the endless chain e.
The mesh of the screen is shewn as square, the rollers and bars being at right
angles with each other; and the distance between the rollers the same as that
between the bars. The former lie above the latter which are hollowed to receive
them.
The stuff to be screened is fed on to the head of the screen. The rotary motion
of the rollers carries as much of it as is too large to pass through forward to the
other end or foot.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what 1
claim is :
In screens, the combination of fixed bars, rollers adapted to be rotated in one
direction and means for so rotating them, as set forth.
Dated the 12th day of April 1892.
HENRY H. LEIGH.