Improved Construction of Screen-grids, or Screens for Grids for use in Screening Coal, Coke, Ashes, Gravel, and other Materials required to be Screened.
Year: 1892

page_text: Date of Application, 31st Oct., 1892
Complete Specification Left, 31st July, 1893—Accepted 2nd Sept., 1893
PROVISIONAL SPECIFICATION.
Improved Construction of Screen-grids, or Screens for Grids for use
in Screening Coal, Coke, Ashes, Gravel, and other Materials
required to be Screened.
"
-
I, FRED SILVESTER "Thistleberry Newcastle-under-Lyme, Staffordshire,
Engineer, do hereby declare the nature of this invention to be as follows:-
This my
invention relates to an improved construction of screen-grids for use in
riddling or sifting ashes, coal, coke, gravel and other materials.
To carry my said invention into practice I construct a framework of metal or
wood, or metal and wood of any suitable shape and size, to each of the inner sides
of the said framework I fasten or fix by bolts and nuts, rivets or other suitable
means the ends of the intersecting bars of metal or other material which form the
grid or sieve, such bars having flat sides, and being rectangular or tapering in cross-
section, in each of the transverse bars I cut or form by any suitable means at a
suitable distance or distances apart according to the size of the mesh required any
suitable number of gaps or slots of suitable width for a suitable distance down-
wards from their top edges, and in each of the longitudinal bars I form corre-
sponding gaps or slots from their bottom edges upward, so that when the said bars
are fitted together or interlocked, the longitudinal bars will fit into the gaps or
slots formed in the transverse bars and intersect each other at right angles or at
about right angles, and the top edges of the longitudinal bars will be level with
the top edges of the transverse bars, by decreasing the depth of the slots in the
said bars the top edges of the longitudinal bars will project a short distance above
the top edges of the transverse bars.
Dated this 10th day of June 1892.
JOHN NEWTON,
Longport, Staffs., Agent for Applicant.
COMPLETE SPECIFICATION.
Improved Construction of Screen-grids, or Screens for Grids for use
in Screening Coal, Coke, Ashes, Gravel, and other Materials
required to be Screened.
FRED SILVESTER, "Thistleberry Newcastle-under-Lyme, Staffordshire,
Engineer, 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 my invention relates to an improved construction of screen-grids for use in
riddling or sifting ashes, coal, coke, gravel and other materials.
To carry my said invention into practice I make such screens of any suitable
dimensions, the intersecting metallic bars of such grids being rectangular or
tapering in cross-section, in each one of the transverse bars I cut or form by any
suitable means any suitable number of gaps or slots according to the size of the
mesh required, each slot being of suitable width and extending a suitable distance
downwards from their top edge, in each of the longitudinal bars I form corre-
sponding gaps from their bottom edge upwards, so that when the said bars are
fitted together or interlocked, the said longitudinal bars will fit into the gaps
formed in the transverse bars and intersect each other at right angles or at about
right angles, and the top edges of the longitudinal bars will be level with the top
edges of the transverse bars, by decreasing the depth of the slots in either series of

page_text: bars the top edges of the longitudinal bars will project a short distance above the
top edges of the transverse bars.
In order that my said invention may be more readily understood and explained
in detail I have hereunto annexed a sheet of drawings on which letters of reference
are marked on corresponding parts on all the figures alike.
to
DESCRIPTION OF DRAWINGS.
Figure 1 is a plan view of a part of the mesh of a grid or sieve made according
said invention.
my
Figure 2 is a side elevation of Figure 1.
Figure 3 is a side elevation of one of the longitudinal bars of the mesh of such
grids.
Figure 4 is a side elevation of one of the transverse bars of such grids.
In these figs. a represents the longitudinal bars, and the transverse bars of
such grids, which bars I prefer to make of or from steel or wrought iron, and when
such bars are fitted together it will be seen that the top edges of the longitudinal
bars will project a short distance above the top edges of the transverse bars, by
increasing the depth of the slots in either the bars a or the bars 6 the top edges of
the said longitudinal and transverse bars will be flush or level when such bars are
fitted together.
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 ;-
The construction of the grids of screens or sieves of or from steel or iron bars
having a rectangular or tapering cross-section, in either the longitudinal or trans-
verse series of bars I form any convenient number of suitably shaped slots
according to the size of mesh required which slots extend a suitable distance
downwards from their top edges, in the other series of bars I form corresponding
gaps or slots from their bottom edges upward so that when the said metallic bars a
and 6 are fitted together or interlocked the said longitudinal bars will fit into the
gaps formed in the transverse bars, and intersect each other at right angles or at
about right angles, and the top edges of one of the series of bars will be flush or
level with the top edges of the other bars, or such edges may project a short
distance above the top edges of the other series of bars as herein substantially
described and set forth.
Dated this 30th day of July 1893.