Year: 1888

page_text: I MARK FAWCETT of 59 Kings Road Chelsea S.W. Architect and Surveyor do
hereby declare the nature of this invention to be as follows :-
My invention consists of a floor constructed with flanged tube lintels, made of a fire
resisting clay or other fire resisting material and of various sections which are made
to rest on the lower flanges of rolled iron joists, and also to pass under the flange of
same, an air space between the iron joist and flange of tube being formed, concrete is
then filled in between and over the tubes, forming concrete arches which take their
bearing on the lower flange of the iron joist independent of the tubes. The function
of the tubes is to protect the iron joists from the action of fire; to reduce the dead
weight of the floor; and to act as centering until the concrete is set.
groove is formed in the tubes to make a key for the plaster of the ceiling.
A dovetail
HUGHES, ELI & HUGHES,
76, Chancery Lane, W.C.

page_text: COMPLETE SPECIFICATION.
Improvements in the Construction of Fire-proof Floors.
I, MARK FAWCETT, of 59 Kings Road, Chelsea, S.W. Architect and Surveyor, 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 relates to improvements in the construction of fire-proof floors, and
has for its object to encase and so protect the iron or steel joists or girders or other
load carrying material used in such floors, to dispense with the use of centering in the
construction of such floors, to reduce the dead weight of such floors, and to enable them
to be constructed more expeditiously and economically than heretofore.
My invention consists of a floor formed or constructed with flanged tubular lintels
as the special feature, these lintels are made of. fire clay or other fireproof material,
and of various sections which are arranged to rest on the lower flanges of iron or steel
joists or girders and to pass under the lower flanges of the same, an air space being
formed between the under surface of the joists or girders, and the lower part of the
tubular lintels. Concrete is placed between and over the tubular lintels so as to form
concrete arches which take their bearing on the lower flanges of the joists or girders
independently of the lintels.
'
The function of the tubular lintels is to protect the joists or girders from the action
of fire, to act as centering until the concrete is set, and to reduce the dead weight of
the floor. Dovetail grooves are formed in the undersurface of the lintels to make a
key for the plaster or other material of the ceiling below.
And in order that my invention may be more fully understood I have shewn the
same in the accompanying drawing in which Figure 1 is a horizontal section or plan,"
Figure 2 a longitudinal and Figure 3 a transverse section of my improved construction
of fire proof floors.
L. L... are the flanged tubular lintels whose upper parts have a semi-circular
transverse section while their lower part is flat, as shewn, and furnished with lateral
flanges f. f... and bevilled edges. The under surfaces of these lintels are further
provided with longitudinal dovetail grooves g. g. . . serving as a key or fixing means
for the plaster or other material of the ceiling below.
•
The joists or girders J. J... are fixed at a suitable pitch to give the required
strength, and the lintels L. L.. are made of the proper lengths to slot in between
the webs w. w... of the joists or girders J. J... and to rest on the lower flanges a. a...
thereof. The lintels L. L'... are fixed in such a manner that their lower or flat
portions p. p... are below the bottom flanges a. a. . . of the joists or girders, leaving
an air space S. between the two.
The lateral flanges f. f... owing to their peculiar shape allow the concrete, which
fills the space between the same and covers the lintels L. L..., to have a direct
bearing on the lower flanges a. a. . . of the said joists or girders J. J'..., this con-
crete supporting, when set, the flooring and the load placed thereon.

page_text: The floors are finished in the ordinary manner with boards, wood blocks, stone, bricks,
tiles, cement, asphalte, and the like, while the ceiling below the same is formed with
plaster or other suitable material.
The joists or girders can also be perforated as shown at d. d... making the air space
in the upper part of the tubular lintel continuous in addition to the air space $; the
air spaces thus formed being continuous constitute a flue or conduit for the outward
passage of foul air or heat through the walls into the open air outside.
My improved lintel enables me to protect the load carrying material, to dispense
with centering, to considerably reduce the dead weight of the floor, while permitting
floors to be constructed expeditiously and economically.
Having thus particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim, is:
1. The improved construction of fire proof flooring arranged and operating sub-
stantially as and for the purpose described.
2. The improved flanged tubular fire proof lintels substantially as hereinbefore
described and shewn in the drawing.
HUGHES, ELI & HUGHES,
76, Chancery Lane, London, W.Ć.,
Agents for Applicant.