A. Burnt or otherwise Prepared Brick-clay, Fire-clay, or Cement Tile, for Supporting Concrete between Iron or Steel Joists, and . then Becoming Part of the Construction of a Fireproof Floor.
Year: 1895

page_text: Date of Application, 9th Apr., 1895
Complete Specification Left, 16th July, 1895-Accepted, 5th Oct., 1895
PROVISIONAL SPECIFICATION.
A. Burnt or otherwise Prepared Brick-clay, Fire-clay, or Cement
Tile, for Supporting Concrete between Iron or Steel Joists, and
. then Becoming Part of the Construction of a Fireproof Floor.
I ARCHIBALD DAVIS DAWNAY Civil Engineer of London Bridge House
King William Street London E.C. and of Nine Elms Lane in the Parish of
Battersea S.W. and of the East Moors and 71 Tudor Road Cardiff, Glamorganshire
lo hereby declare the nature of this invention to be as follows:-
My invention is an improvement in the construction of fireproof floors and
consists of a tile of burnt or otherwise prepared brick-clay fire-clay, glazed or
unglazed, or of Portland or other cement, made of any useful and convenient size
or shape, round, square or rectangular but usually about 27" long 9" wide and of
varying depth to suit the required strength for any given span or length.
The said tile is to have one or more stiffening webs or ribs with side gussets upon
the upper surface & the webs or ribs to have a top flange or fillets thereon but the
said tile may be made without such webs and ribs and only of one flat piece. The
underside surface of the said tile is to be scored or grooved in a lozenge diamond
or square pattern to form a key or holdfast for plastering of ceiling; or they the
said undersides. may be quite plain.
Also the said tile may or may not have fillets or rebates formed upon the
abutting edges on one or both sides for the purpose of effectually covering each
joint or abutting edge.
Also the ends of the said tile will have jawed or slotted ends to fit over and
under the flanges of rolled iron or steel joists, or the ends may simply bear upon
the said flanges and drop between by means of rebate or sinking of the ends which
are bevilled or dovetailed.
The object of the said tile is to obviate the use of centring for carrying concrete
between rolled iron or steel joists or girders while the concrete is setting; and to
become itself a part of the solid construction after the concrete has set, void of all
spaces and interstices.
In the accompanying drawings in which like letters of reference indicate
corresponding parts :-
Fig. 1 is an elevation of. my said tile & a section thro' the joists.
Figs. 2 & 3 are cross sections at the centre of the said tile shewing the web, a,
without fillets and, b, with fillets.
Fig. 4 is a top plan of the said tile.
Figs. 5 & 6 are respectively plans of the underside looking up shewing the
scoring or grooving, and a cross section thro' a set of tiles.
Fig. 7 is a part elevation, the said tile shewing the rebated and bevilled or
dovetailed ends.
a is the web without fillets.
b is the web with fillets.
c is the rolled joists.
d jawed ends.
e dronued or rebated and hevelled, ends.

page_text: A Burnt or otherwise Prepared Brick-clay, Fire-clay, or Cement
Tile, for Supporting Concrete between Iron or Steel Joists, and
then Becoming Part of the Construction of a Fireproof Floor.
1 ARCHIBALD DAVIS DAWNAY Civil Engineer of London Bridge House
King William Street London E.C. and of Nine Elms Lane in the Parish of
Battersea S. W. and of the East Moors Cardiff' 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:-
My invention is an improvement in the construction of fireproof floors and
consists of a tile of burnt or otherwise prepared brick-clay, fire-clay-glazed or
unglazed or of Portland or other cement, made of any useful or convenient size or
shape, round, square or rectangular, but usually about 27 inches long and 6" to
9" wide and of varying depth to suit the required strengthf or any given span or
length.
The said tile is to have one or more stiffening webs or ribs with side gussets upou
the upper surface or a continuous coved side to the webs instead of the said gussets
for supporting the webs. The double webbed tile is to have the inner sides of the
said webs inclined inwards or dovetailed to form a better key or holdfast for the
concrete; also the said web or webs may have a top flange or fillet thereon on one
or both sides of the web or webs: but the said tile may be made without such webs
or ribs or flanges and only of one flat piece or slab, or with reduced plain ribs or
without flanges but dovetailed as above described.
The underside or ceiling surface of the said tile is to be scored or grooved in
lozenge, diamond, square or longitudinal lines or simply scratched or Huted with
dovetailed edges so as to afford a secure key to the plaster of ceiling, or I may
make the surface quite plain.
Also the said tile may or may not have fillets or rebates formed upon the
abutting edges on one or both sides for the purpose of effectually covering each
joint or abutting edge.
Also the said tile will have jawed or slotted ends to fit over and under the flanges
of rolled iron or steel joists, angles, or girders; or the ends may simply bear upon
the said flanges and drop between by means of a rebate or sinking of the ends which
may be either dovetailed or square.
The object of the said tile is to obviate the use of centring for carrying the
concrete between the joists angles or girders while the concrete is setting, and to
become itself a part of the solid construction after the concrete is set & void of all
spaces and interstices & therefore be less likely to harbour dirt or secretions &c.
In the accompanying drawings in which like letters of reference indicate
corresponding parts:
Fig. 1 is an elevation of my said tile and a section thro' the joists.
Figs. 2 & 3 are cross sections at the centre of the said tile, shewing the web, a,
without top fillets: and, b, with fillets.
Fig. 4 is a top plan of the said tile.
Fig. 5 is a plan looking up shewing the grooved undersides for plaster key.
Fig. 6 is a cross section of the complete floor thro' a set of tiles.

page_text: Fig. 7 is a part elevation of the said tile shewing the rebated and bevelled or
dovetailed ends.
Fig. 8 is an elevation of my said tile without gussets, but with coved sides
instead thereof, and with parallel webs.
Fig. 9 is a cross section of the same thro' a set of tiles shewing the complete
floor.
Fig. 10 is an elevation of the said tile without fillets and coved sides.
Fig. 11 is a cross section of the same thro' a set of tiles shewing the complete
floor.
Fig. 12 is a cross section thro' my said tile with fillets, without gussets, but with
side covings for a double web tile.
Fig. 13 is a similar cross section thro' a single web tile.
Fig. 14 is a similar cross section thro' a tile with top fillets reduced level with
the jaw ends & without coves as shewn by Figs. 10 and 11.
a, is the web without fillets: b, is the web with fillets: c, is the rolled joist:
d, jawed ends. e, dropped or rebated bevilled ends: 1, concrete g, gussets: h, side
rebates: i, grooving: J is the tile k, reduced fillets: 1, side coving.
Having thus particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed 1 declare that what 1
claim is :-
In fireproof floors the use of tiles made of the material above stated, furnished or
constructed with upper web or webs; or ribs; with one or more fillets, or without
fillets; with or without gussets; or with fillets and side coves; or without fillets
but with side coves: and also furnished or constructed with droppel bevil ends
or with ordinary jaws; with or without side rebates or flanges, or with webs or
fillets reduced to be level only with end jaws; and also with undersides grooved
with a plain lozenge or square sinking or simply roughened or fluted surface: the
sections of the several tiles being as shewn on my drawing by Figs. 2. 3. 12. 13.
& 14 respectively.
Dated this 11th day of July 1895.
ARCHIBALD D. DAWNAY.