Improvements in Bridges, Floorings, and other Structures.
Year: 1889

page_text: Date of Application, 21st Mar., 1889
Complete Specification Left. 19th Dec., 1889-Accepted, 25th Jan.. 1390
+
PROVISIONAL SPECIFICATION.
Improvements in Bridges, Floorings, and other Structures.
I, WILLIAM LINDSAY of 23 Queen Anne's Gate, in the City of Westminster,
Engineer, do hereby declare the nature of this invention to be as follows
:-
Bridges, floorings for bridges, and such like have before been made of a corrugated
structure each corrugation of which has been formed of a top plate rivetted to flanges
on the top of two side plates and similarly a flange at the bottom of one of these side
plates has been rivetted to a plate to which also the bottom flange of the side of the
next adjoining corrugation has been also rivetted.
In such structures when the two sides of each corrugation are made to incline to
one another so as to be nearer together at the top than at the bottom any load placed
upon the top of the corrugation tends to force the tops of the two sloping sides one
towards the other and so tends to shear the rivets which hold them to the top plate.
To relieve the rivets of this shearing strain I form the top plate with projections on
its under side for the edges of the flanges of the two sides to butt against. Similarly
the bottom plates are formed with projections on their upper surface for the bottom
flanges of the side plates to butt against.
The plates may be rolled with these projections upon them and the projections may
in this case where the flanges butt against them be of the same depth as the flanges and
be made gradually to diminish in depth as they extend towards the central line of the
top plate.
Or a separate filling piece might be inserted between the two flanges to take the
thrust, such filling pieces being held to the top and bottom plates by rivets-or the
flanges of the two plates might be made to buit one against the other."
1
31
1
1 1000
WILLIAM LINDSAY.
COMPLETE SPECIFICATION.
Improvements in Bridges, Floorings, and other Structures.
I, WILLIAM LINDSAY of 23 Queen Anne's Gate, in the City of Westminster,
Engineer,; 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 :-
Bridges, floorings for bridges, and such like have before been made of a corrugated
structure each corrugation of which has been formed of a top plate rivetted to flanges
on the top of two side plates and similarly a flange at the bottom of one of these side
plates has been rivetted to a plate to which also the bottom flange of the side of
the next adjoining corrugation has been also rivetted.
In such structures when the two sides of each corrugation are made to incline to one
another so as to be nearer together at the top than at the bottom any load placed upon the
top of the corrugation tends to force the tops of the two sloping sides one towards
the other and so tends to shear the rivets which hold them to the top plate. To relieve
the rivets of this shearing strain I form the top plate with projections on its under
side for the edges of the flanges of the two sides to butt against. Similarly the bottom
plates are formed with projections on their upper surface for the bottom flanges of the
side plates to butt against.
The plates may be rolled with these projections upon them and the projections may
in this case where the flanges butt against them be of the same depth as the flanges
and be made gradually to diminish in depth as they extend towards the central line
of the top plate.

page_text: Or a separate filling piece might be inserted between the two flanges to take the
thrust, such filling pieces being held to the top and bottom plates by rivets-or the
flanges of the two plates might be made to butt one against the other.
In order that my said invention may be fully understood and readily carried into
effect I will proceed to describe the drawings bereunto annexed.
DESCRIPTION OF THE DRAWINGS.
Figure 1 is a transverse section of a bridge flooring or like structure with projec-
tions rolled on the top and bottom plates which serve to relieve the shearing strain
upon the rivets which connect the sides with the top and bottom plates.
Figure 2 is a transverse section of a like structure in which a filling piece is intro-
duced between the flanges of the side plates in such manner as to relieve the shearing
strain.
Figure 3 is a transverse section of a like structure in which the edges of the flanges
of the side plates are brought to butt together in such manner as to relieve the
shearing strain.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to he performed I declare that what I
claim is
Bridges, floorings for bridges and other floorings and such like corrugated structures
consisting substantially as described of flanged side plates and top and bottom plates
and in which the shearing strain on the rivets connecting the side plates and the top
and bottom plates is relieved either by projections on the top and bottom plates or by
filling picces held to the top and bottom plates by rivets or by the edges of the flanges
of the side plates butting together.
3000
WILLIAM LINDSAY.