Improvements in Machinery or Apparatus for Screening Coal or other Material.
Year: 1888

page_text: TRUVISIONAL SPECIFICATION.
Improvements in Machinery or Apparatus for Screening Coal or
other Material.
I CHARLES HAVELOCK MOWLL of The Wellington Hall Dover in the County of
Kent Coal Merchant, do hereby declare the nature of this invention to be as
follows:-
This invention relates to improvements in machinery or apparatus having for
object the rapid and economical screening of coal or other material.
My improved machine or apparatus consists mainly of a screen made preferably of
bars of metal placed in the most suitable way to form any desired mesh, this screen
swinging on pivots mounted on a frame and having a pouch, pocket, or recipient,
formed at one end and a mouth on the other.
The working of my improved machine is as follows:
When the machine is ready to receive the material to be screened, the pouch end is
nearest to the ground and the screen above is at an angle of 45° more or less.
The pouch having been filled with the material, the screen is pulled over by a winch,
or other suitable means, until its original position is reversed, or thereabout; that is to
say, the screen is turned on its pivots until the pouch end is sufficiently elevated to
cause the material which it contains to flow by gravitation down the screen, the larger
pieces passing through the mouth into a suitable receptacle, and the small falling
through the meshes of the screen being guided into a separate suitable receptacle, or
into several receptacles if desired to further separate different sized material.'
The pouch having been thus emptied, and the pouch end of the screen being
rendered heavier than the other end thereof, by any suitable means, the screen falls
back into its original position and the pouch is again ready to be filled.
Dated this Eighteenth day of February 1888

page_text: other Material.
I, CHARLES HAVELOCK MOWLL, of The Wellington Hall, Dover, in the County of
Kent, Coal Merchant, do hereby declare the nature of this invention and in what
manner the same is to be performned, to be particularly described and ascertained
in and by the following statement :—
This invention relates to improvements in machinery or apparatus having for object
the rapid and economical screening of coal or other material.
My improved machine or apparatus consists mainly of a screen made preferably of
bars of metal placed in the most suitable way to form any desired mesh, this screen
swinging on pivots mounted on a frame and having a pouch, pocket, or recipient
formed at one end and a mouth on the other.
On the accompanying sheet of Drawing
Figure 1 represents a side elevation of a machine or apparatus embodying my
improvements with screen in position for receiving the material.
Figure 2 represents a side elevation of the same apparatus with screen in position
for discharging, and
Figure 3 is a plan of the screen.
A being the screen.
B bars of metal forming the meshes of same.
C pivots.
D frame on which screen is mounted and serving as receptacle for small coal.
E pouch.
Finouth of screen.
G winch.
H side openining for exit of small coal from frame D.
The working of my improved machine is as follows:-
When the machine is ready to receive the material to be screened the pouch end E
is nearest to the ground, and the screen A, above, is at an angle of 45° more
or less.
The pouch E having been filled with the material, the screen A is pulled over by the
winch G, or other suitable means, until its original position is reversed, or thereabout;
that is to say, the screen A is turned on its pivots C until the pouch end E is sufficiently
elevated to cause the material which it contains to flow by gravitation down the screen,
the larger pieces passing through the mouth F into a suitable receptacle, and the small
falling through the meshes B of the screen A, being guided into the receptacle D, or
into several receptacles if desired to further separate different sized material, and
escaping by the opening at H.
The pouch having been thus emptied, and the pouch end of the screen being made
heavier than the other end thereof, or rendered heavier by any suitable means, the
screen falls back into its original position and the pouch is again ready to be filled.

page_text: I would have it understood that, while I find the machine or apparatus as illustrated
on the drawings answer well for screening coal, I do not limit myself to any particular
form of support for carrying the pivots of the screen, or to any particular mechanical
arrangement for pulling it over, or causing it to pivot; for example, in sifting builder's
sand, or ashes, for which my screen is eminently adapted, the screen may be carried on
a lower frame than that shown on the drawing, the pouch end rest on the ground
while being filled, be pulled over by levers, and the mouth end rest on the ground
when pulled over.
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:
In machinery or apparatus for screening coal or other material, a screen having a
pouch or receiver at one end, and resting upon pivots or bearings in such a manner
that it may be pulled over by a winch, or otherwise, for emptying, and the pouch end
weighted to bring it back to its position for filling, substantially as described.
For the Applicant,
W. E. GEDGE,
Agent.