Improvements in and connected with Fireproof and other Floors and Ceilings.
Year: 1898

page_text: Date of Application, 20th Apr., 1898-Accepted, 25th June, 1898
COMPLETE SPECIFICATION.
Improvements in and connected with Fireproof and other Floors
and Ceilings.
We, HUGH LUPUS CUNNAH and HENRY ARTHUR HUGHES, both of 11, Queen
Victoria Street, in the City and County of London, Manufacturers, 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:-
The object of this invention is to enable the ceilings of fireproof and other
floors to be made flush on the underside that is to say to prevent the lower flanges
of main girders from projecting below the general level of the ceiling.
This object we attain by suspending the cross joists from the bottom flange of
the main girder by means of clips.
And in order that our said invention may be fully understood we will proceed
to explain the same with reference to the accompanying sheet of drawings in
which
Fig. 1 represents a portion of a floor and ceiling constructed according to this
invention.
Fig. 2 is detail of same showing clips hereinafter referred to more clearly.
Fig. 3 is end view of clip.
Fig. 4 is section of one bay of floor.
Fig. 5 shows alternative method of wedging.
The same letters denote the same parts in all the figs a is the girder hb the
cross joists cc clips for securing cross joists to girder dd wedges for securing
clips to joists ee angle irons supporting concrete f g rafters, h floor boards.
When constructing floors to support heavy weights the floor is made of concrete
arches supported by angle irons ee attached to the girders or resting on the
lower flanges thereof and to enable the ceiling to cover the lower flanges of the
said girders we secure cross joists b underneath the lower flanges of the girders
by means of clips or clamps c. These clips or clamps are constructed as shewn by
Figs. 1, 2 and 3 having a space j cut away therefrom to receive the joists,
wedges dd being inserted under the top flange of the joists to secure the whole
firmly together.
As will be seen by inspection of the drawings the clips or clamps are so
constructed as to bear on the upper side of the lower flanges of the joists.
Corrugated sheet metal k preferably having dovetailed corrugations reaching
from joist to joist and resting on the lower flanges thereof is inserted between
the joists and the underside thereof and is plastered over the dovetailed corruga-
tions forming keys for the plaster the ceiling when finished showing an unbroken
surface the underside of the bottom flanges of the girders being completely
covered by the cross joists and plaster.
When constructing floors which have to support light weights only the concrete
arches may be dispensed with as shown by Fig. 4 in which the space between the
sheet metal k and the top of the girders is filled in with solid concrete the
underside of the corrugated metal being plastered over in the usual way.
DO71

page_text: Floors constructed as hereinbefore specified are much lighter than those con-
structed with fireclay or terra-cotta tiles or lintels the sheet taking the place of
the said clay or terra-cotta. The wedges may be underneath the top flanges of
the joists as shown by Figs. 1 to 4 or above the said flanges as shown by Fig. 5
and the sheet k may be of any suitable material other than metal.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that what
we claim is:
1. In the construction of ficors and ceilings securing the joists to the bottom
flanges of the girders by means of clips and wedges substantially as specified.
2. In the construction of floors and ceilings the combination of girders having
joists secured to the underside of the bottom flanges thereof by means of clips
or clamps corrugated sheet metal or sheet of other material resting on the lower
flanges of the said joists plaster applied to the underside of the said sheets and
concrete above the said sheets all substantially as hereinbefore specified.
3. The clips c having spaces formed therein to the receive the joists and secured
thereto and to the girders by means of wedges substantially as specified.
4. Floors and ceilings constructed as hereinbefore specified and shewn by the
accompanying drawings.
Dated 20th A muil 1908
H. C. FOWLER,
11, Furnival Street, Holborn, London, Agent for Applicants.