Improvements in or connected with Apparatus for Soreening Coal and the like.
Year: 1896

page_text: Date of Application, 26th Aug., 1896
Complete Specification Left, 3rd Apr., 1897-Accepted, 22nd May, 1897
PROVISIONAL SPECIFICATION.
Improvements in or connected with Apparatus for Soreening Coal
and the like.
We, HERBERT ST. JOHN DURNFORD of Ackton Lodge, Featherstone, near
Pontefract, Mining Engineer, and HARRY WORMALD, of The Villas, Feather-
stone, near Pontefract, Engineer, do hereby declare the nature of this invention to
be as follows:-
According to our invention the screen is a specially desigued shaker screen,
the coal being passed on to a top screening plate by means of a tippler aud
shoot, all large coal passing over a further shoot on to a travelling band or
apron. The screening plate can have a mesh suitable for middle-sized coal,
passing through, and along another screening plate on to a transverse travelling
belt or apron, all small coal passing through the said screening plate into a
hopper below, and is then passed away along a further transverse belt or apron.
The screen is operated or driven from a shaft by means of a double webbed
crank, and connecting rods joined to the sides of the screen. The screen itself
is suspended from a fulcrum by connecting rods, and the screen end furthest
away from the crank is suspended from a further fulcrum, by connecting rods
anchored on sides of screen.
The screen when operated is caused to rise as well as move forward when
being driven forward by the crank. This upward and forward movement at the
same time gently shakes the coal up as well as forward, thus effectively screening
the coal. The anchorage at the outer end of screen being arranged at a less
distance from the vertical line gives the same forward movement to the screen,
but a less upward one, and allows the coal to slide gently into the shoot.
JOHN E. WALSH,
Royal Exchange Chambers, Boar Lane, Leeds,
Patent Agent to the Applicants.
Improvements in or connected with Apparatus for Soreening uoal
and the like.
We HERBERT ST. JOHN DURNFORD, of Ackton Lodge, Featherstone, near
Pontefract, Mining Engineer, and HARRY WORMALD, of The Villas, Feather-
stone, near Pontefract, Engineer, do hereby declare the nature of this invention,
and in what manner the same is to bo performed, to be particularly described and
ascertained in and by the following statement:-

page_text: According to our invention the screen is a specially designed shaker soreen, the
coal being passed on to a top screening plate A by means of ordinary tipping
waggons and shoot C, all large coal passing over the top screen to a further
shoot D and then on to a travelling band or apron E.
The top screening plate A can have a mesh suitable for middle sized coal to pass
through and along the lower screening plate B on to a transverse travelling belt
or apron at F, all small coal passing through the second screening plate B into a
hopper G below, and is then passed away along a further transverse belt or
apron at H.
The screens are oporated or driven from counter-shaft J and belt K to pulley L
on shaft M; upon the shaft M are double webbed cranks N, connecting cross
rod O, and guide arms P attached by stud R to frame; the screens are attached
to crose rod O at one end, and at the other end (furthest away from the crank)
they are suspended by fulcrum arms S and side connecting rods T anchored on
sides of screen.
The screws when operated are caused to rise as well as move forward when
being driven by the cranks.
This upward and forward movement at the same time gently shakes the coal up
as well as forward thus effectively screening the coal.
The anchorage at outer end of screen, being arranged at a less distance from the
vertical line, gives the same forward movement to screen but a less upward one,
and allows the coal to slide gently into the shoot.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we would have it understood
that we do not limit ourselves to the number of grades of screens shown and
-described, but wo declare that what we claim is :-
1. In screening cpal the upward and forward movement of the soreen for
screening and passing the various grades. of coal forwards to the travelling aprons
or belts or other receptacles in the manner and for the purposes shown and
described.
2. The combination of the shaft M, crank N, cross rods O, and side connecting
rods T, guide or fulcrum arms P, and 8, operating as and for the purposes
substantially as shown and described.
Dated thin and
JOHN E. WALSH,
Royal Exchange Chambers, Boar Lane, Leeds,
Patent Agent to Applicants.
JOHN E. WALSH,
Royal Exchange Chambers, Boar Lane, Leeds,
Patent Agent to Applicants.