Improvements in Pit Props, Bars, and Girders.
Year: 1897

page_text: Date of Application, 2nd Nov., 1897
Complete Specification Left, 15th Apr., 1898-Accepted, 20th May, 1898
Date of Application, em 1
Complete Specification Left, 15th Apr., 1898-Accepted, 20th May,
1898
We, WILLIAM FIRTH, of Water Lane, Leeds, in the County of York, Iron and
Steel Merchant, and 'EDWARD THOMPSON, of Melton Road, Bridgeford, in the
County of Nottingham, Traveller, do hereby declare the nature of this invention
to be as follows:-
T
The object of this invention is to construct pit props, bars, or girders, in such a
manner that their ends are provided with a broad surface, which prevents their
cutting into the wood or other packing employed between them and the roof
or floor.
According to our invention, we employ iron or steel of H section, and we cut
away the web and a portion of one flange so as to leave the two flanges projecting
from the end of the prop. The shorter flange is then bent down across the end of
the divided web and the longer flange is afterwards bent over the first flange,
both flanges thus coming to their opposite sides of the prop. The end of the prop
or girder is thus provided with a seat formed of the two thicknesses of the flange
which effectually prevent the ends of the prop or girder cutting into substances
with which it is brought into contact.
In some cases I cut the web and one of the flanges away at the same line, and I
bend the remaining flange down over the girder, so that the extremity of the
turned down flange rests on the cut off flange on the opposite side.
1007
BREWER & SON,
London and Leeds, Agents for the Applicants.
Improvements in Pit Props, Bars, and Girders.
We, WILLIAM FIRTH, of Water Lane, Leeds, in the County of York, Iron and
Steel Merchant, and EDWARD THOMPSON, of Melton Road, Bridgeford, in the
County of Nottingham, Traveller, 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 construct pit props, bars, and girders, in such a
manner that their ends are provided with a broad surface, which prevents their
cutting into the wood or other packing employed between them and the roof
or floor.
In order that our invention may be clearly understood, we will proceed to describe

page_text: same with reference to the accompanying drawing, in which similar letters refer to
like parts in all the figures.
According to our invention, we employ iron or steel of H section, as seen at
Figures 1 and 2, and we cut away portions of the web A and the flange B, so
as to leave two flanges B and C projecting from the end of the prop as seen at
Figures 3 and 4. The flange B is then bent down across the end of the web A,
and the flange C is afterwards bent over the first flange B, both flanges B and C
thus coming to opposite sides of the prop, as seen at Figures 5 and 6. The end
of the prop or girder is thus provided with a seat formed of the two thicknesses
of the flange, which effectually prevent the end of the metal cutting into the
substances with which it is brought into contact.
In Figures 7 and 8, a slight modification has been shewn, a portion of the web A
and flange B being cut away at the same time leaving the flange C projecting
at some distance from the ends of the girder. By bending the projecting flange
down over the ends of the girder as seen at Figures 9 and 10, the extremity of
the said flange rests on the ends of the cut off flange 1, thus making a strong
and firm seat for the pit prop, bar, or girder to receive end pressure.
Although we have described our invention with reference to the girders being
cut in one direction, it is obvious that the opposite ends of the said girders might
be cut in opposite directions, or one end of a girder might be cut in one manner
and the opposite end be cut according to the modified form described.
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 pit props, bars and girders, the cutting away of a portion of the web and
the bending of the flanges one over the other, substantially as described with
reference to Figures 1 to 6 of the accompanying drawing.
2. In pit props, bars and girders, the cutting away of a portion of one flange and
a portion of the web and bending the projecting flange down against the end
of the girder, substantially as described with reference to Figures 7 to 10 of the
accompanying drawing.
1
1
3
די
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בד
1000