Improved Tiles for Permanent Centreing, to be 'Used in the Construction of Fireproof Floors.
Year: 1895

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Date of Application; 29th Apr., 1.895
Complete Specification. Left, 3rd Dec., 1895-Accepted, 4th Jan, 1896
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PROVISIONAL SPECIFICATION.
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Improved Tiles for Permanent Centreing, to be 'Used in the
Construction of Fireproof Floors.
'I, George Robert DawnAY 9 Fellbrigg Road East Dulwich London S.E.
Civil Engineer do hereby declare the nature of this invention to be as follows:
To form tiles of such a shape as will enable the same to be hung up into required
position each tile in its own space, without disturbing any adjoining tiles or other
work.
These tiles may be made of any suitable material and without restriction of size.
The bottom is horizontal, and prepared with sinkings, or fillets, to give keying for
plaster and concrete; vertical rib or ribs are formed in one piece with the bottom,
and at the top of each rib, is a flange; the ribs are, in the direction of the length of
bottom and of equal depth throughout.
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The ribs and top flanges are shorter than the bottom of tile to allow of passing
up clear between edges of floor bearers or joists; the ribs are made with or without
transverse perforations. At the edge of top flange on the underside a fillet is
formed, or else small holes through the flange for inserting pegs, to check the ends
of hanging bar, described below, from being struck round,
The tiles may he moulded, longitudinally or transversely the keyings for plaster
or concrete being set respective to the direction of moulding,
Straight bars, or rods, of any suitable material are used for hanging the tiles
up by, these bars or rods resting, at the ends on the flanges of joists or other
supports.
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Those tiles with one rib only, will have that rib placed at such a position from
the centre of bottom as will bring the hanging bar over the centre of gravity's
that the bottom of tile will be horizontal when hung.
.. COMPLETE. SPECIFICATION.
Improved Tiles for Permanent Centreing, to be Used in the
Construction of Fireproof Floors.
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I, GEORGE ROBERT DAWNAY 9 Kellbrigg Road East Dulwich London S.E.
Civil 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:-
To form tiles of such a shape as will enable the same to be hung up into required
position, each tile in its own space without disturbing any adjoining tiles or other
work.
These tiles may be made of any suitable material and without restriction of
size; the bottom is horizontal and prepared with sinkings, or fillets, to give keying
for plaster and concrete; vertical rib, or ribs, are formed in one piece with the

page_text: bottom, and at the top of each rib is a flange; the ribs are in the direction of the
length of bottom and of equal depth throughout.
The ribs and top flanges are shorter than the bottom of tile to allow of passing
up clear between edges of floor bearers or joists; the ribs are made with or without
transverse perforations. At the edge of the top flange, on the underside, a fillet is
formed or else small holes through the flange for inserting pegs to check the
ends of hanging bar, described below, from being struck round
1-170 17
The tiles may be moulded longitudinally or transversely, the keyings for plaster
and concrete being set respective to the direction of moulding..
Straight bars or rods of any, suitable material are used for hanging the tiles
up by, these bars or, rods, resting at the ends on the flanges of joists or other
supports.
Those tiles with one rib only will have that rib placed at such a position, from
the centre of bottom,as will bring the hanging bar over the centre of gravity so
that the bottom of tile will be horizontal when hung.
The drawing shews various views of tiles with one rib.
Figure 1 is an elevation of a longitudinally moulded tile T, hung in position
upon the bar B. which rests at the ends upon the flanges of joists J J.
Figure 2 is a vertical' section on. line aa of Figure F,
is a fillet for checking
the hanging bar from being struck round, but this fillet may be omitted.
1.)
..It !
Figure, 3 is an elevation of a transversely moulded tile, PP perforations,
N N-are nails or pegs; perforations and pegs may be omitted.
Figure 4 is a section on line of Figure 3.
Figure 5 is a plan of Figure 3 looking from above:
Figure 6 is a section on line y y of Figure 3.
Figure 7 is a sectional elevation shewing end view of four single rib tiles in
position as ready for receiving the fireproof material or concrete, J J are joists
and. B 1, a binder.
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The keyings for plaster and concrete are by preference, fillets or grooves but
small perforations, deep, scorings, fragments of brick stuck on or any other
suitably roughened surface may 'be used.
1.
The hanging bars or rods may be of any suitable material and section. 'The
depth of ribs may be sufficient to allow of supporting on the top flanges of bearers;
and clips, or hooks, or lugs of any suitable material or section may be used for
hanging the tiles up.
1.
Having now particularly described and ascertained the nature of my said inven-
tion andvin what manner the same is to be performed I declare that what I
claim is
absql.
1. The construction of tiles with an upper portion shorter than the bottom at
each end so that the upper part may pass clear between the edges of joists or other
supports, each tile in its own space, and hung or slang to such supports and so to
form a permanent centreing....
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2. The adapting of the herein before described tiles to any purpose or use.
Dated this 3rd day
of December 1895.
GEORGE: ROBERTIDAWNAY.
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