Year: 1887

page_text: Date of Application, 7th Nov., 1887
Complete Left, 12th Dec., 1887
Complete Accepted, 13th Jan., 1888

page_text: I, FRANCIS PILKINGTON, of 41 Redhill Street, Regents Park N.W., in the County
of Middlesex, Iron Merchant, 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 my invention is to prevent rolled iron or steel joists, beams, girders
or the like from buckling, twisting, sagging or bending under the action of heat
caused by fire in buildings with provision for fire proofing same by means of concrete
or other like material.
I prefer to make pieces of tee, angle, flat or other like iron or steel, forge the same
to form bracket shape to fit, rivet or bolt to the webs and flanges of joist, beam, or
girders, in any size or shape for each section. I rivet or bolt the said brackets to the
web and flanges at short or long distances apart with returned end or ends to pass
over either the top or bottom flanges, with continued return end to form a rest,
support or key and on other side, by angle shaped iron or steel added for similar
purposes for holding in position concrete or the like to act as fire proof material. To
add greater strength and additional resisting power where necessary, I rivet or bolt
beneath bottom flanges of joists, beams or girders, cast or wrought iron or steel
channel shaped bars or formed of two angle irons rivetted or bolted to form channel
and in order that this invention may be thoroughly understood, I now proceed to
describe the accompanying drawings thereof, reference being had to letters and
figures marked thereon.
Figure 1, represents the section of a plain joist with flanges marked G and H, with
the bracket pieces marked A, made in either steel or iron, from tee, angle or any
other form by forging the said brackets to suit their section of joist, beam or
girder I.
Figure 2, denotes the return end or ends carried over and under flanges of joists by
cutting away the leg of tee iron or one side of the angle iron or steel continuing the
table of the tee or remaining side of angle over and under flanges of joists, rivetted or
bolted or the like.
Figure 3, denotes the continuation of bracket marked A. continued downward and
beneath flange of joist, beam or girder and continued as shewn towards and rivetted
or bolted securely to under flange of joist, beam or girder to support beneath and to
lower flange, concrete or other like material. Figure 4, denotes the continued return
ends marked B, made to form supports for the concrete or other like material and

page_text: denotes marked C, the forged-piece to form a clutch or extra resisting power to prevent
the joist twisting either way.
Figure 5, is a section where I add channel bar by rivetting or bolting the same to
under flange of joists, beams or girders as shewn and thereto I rivet or bolt flat iron
or steel or other suitable section for such said purposes, to the sides of the channel
marked N.
Figure 6, represents a section of a box girder where I form the channel marked N
of angle irons or steel rivetted or bolted beneath flanges at L, of girder as shewn with
the returned ends B, of bracket K with concrete in position marked J.
I do not limit myself to the particular size, shape or mode of construction, as it is
evident may be varied by making the brackets and continuations according to
circumstances, provided they be of such a nature as herein before described.
Like letters refer to like parts in each of the figures.
A, the brackets. B, the returned ends of brackets. C, the parts of brackets which
fit over the top flange or under bottom flange. G, top flange. H bottom flange.
I, joist. J, concrete. K channel support. N, where the channel iron is rivetted.
L angle iron pieces on bottom flange.
Having now particularly described the nature and object of my invention and
the manner in which the same is to be performed, I claim as new and novel the
following:
First. The combination of the application of iron or steel brackets to plain iron
or steel joists, substantially herein described and according to the accompanying
drawings.
Secondly. The combination of the application of iron or steel brackets with returned
ends C, C, or the brackets A, to joists, beams or girders, substantially herein described
and according to the accompanying drawings.
Thirdly. The combination of channel bar or bars K, or the like to form a channel,
to hold fire proof material to joist, beams or girders, for fire proof and other purposes,
substantially herein described and according to the accompanyed drawings.
Dated this 10th day of December 1887.
FRANCIS PILKINGTON,
Applicant.