Improvements in Lining Plates for Tunnels or Subways.
Year: 1892

page_text: Date of Application, 19th Feb., 1892
Complete Specification Left, 16th Nov., 1892-Accepted, 17th Dec., 1892
PROVISIONAL SPECIFICATION.
Improvements in Lining Plates for Tunnels or Subways.
I, STEPHEN ALLEY, of Sentinel Works, Polmadie, in the County of Renfrew,
North Britain, Engineer, do hereby declare the nature of this invention to be as
follows, that is to say :-
My said invention has for its object to improve and facilitate the lining of
tunnels or subways with metallic plates. The plates are made with flanges by
means of which they are fixed together, and which at each longitudinal edge of
most of the plates extend towards the centre of curvature.
Hitherto a key plate has been used for completing and tightening each ring of
plates, and the longitudinal flanges of such key plate and those of the adjacent
plates have been inclined somewhat from the normal direction to allow of the
key plate being wedged into its place.
In carrying out my invention I make each key plate in two parts shaped like
reversed wedges at their meeting parts and I connect the two parts by screw bolts
by means of which the parts can be drawn together so as to tightly fit the space to
be occupied by them. With this improved construction of key plate, the other
plates may be all exactly alike as regards their flanges, the longitudinal flanges of
the key plate as well as those of the adjacent plates being all normal or extending
towards the centre of curvature.
With this arrangement only the key plates are special or different from the
others, the plates on each side of the key plates not requiring to be special as
heretofore, and considerable expense is thereby saved.
Dated this Eighteenth day of February 1892.
EDMUND HUNT,
Applicant's Agent.
COMPLETE SPECIFICATION.
Improvements in Lining Plates for Tunnels or Subways.
I, STEPHEN ALLEY, of Sentinel Works, Polmadie, in the County of Renfrew,
North Britain, 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, that is to say:-
My said invention has for its object to improve and facilitate the lining of
tunnels or subways with metallic plates. The plates are made with flanges by
means of which they are fixed together, and which at each longitudinal edge of most
of the plates extend towards the centre of curvature.
Hitherto a key plate has been used for completing and tightening each ring of
plates, and the longitudinal flanges of such key plate and those of the adjacent
plates have been inclined somewhat from the normal direction to allow of the
key plate being wedged into its place.
In carrying out my invention I make each key plate in two parts shaped like
reverse wedges at their meeting parts, and I connect the two parts by screw bolts
by means of which the parts can be drawn together so as to tightly fit the space
occupied by them.
And in order that my said invention and the manner of performing the same
may be properly understood I hereunto append a sheet of explanatory drawings, to
be hereinafter referred to, and showing an example of my improvements in lining
plates for tunnels or subways.

page_text: Figure, 1, of the drawings is a transverse vertical section of the key plate and
of a part of each of the lining plates to which it is fixed.
Figure, 2, is a side elevation of one of the halves of the key plate.
In these drawings the same reference letters and numerals are used to mark the
same or like parts wherever they are repeated.
As shown in the drawings I make each key plate in two paris, A, and, B, shaped
like reverse wedges at their meeting parts, and I connect the two parts by screw
bolts, C, by means of which the parts can be drawn together so as to tightly fit
the space to be occupied by them. The two parts, A, and, B, of the key plate are
fixed to the lining plates, D, and, E, by holts, D 1, which pass through them, and
through the flanges of the plates, D, E. The two parts, A, and B, are made with
fitting strips, A 1, at the places where they bear against each other. The screw
bolts, C, are made with T-heads which fit into recesses, C 1, formed in one part, A,
of the key plate having its thicker end to the outside of the lining plates, D,
and, E. With this improved construction of key plate made in two parts, A,
and, B, the lining plates may be all exactly alike as regards their flanges, the
longitudinal flanges of the lining plates, D, and, E, adjacent to the key plate being
normal or extending towards the centre of curvature like the other longitudinal
flanges. With this arrangement only the key plates are special or different from
the others, the plates, D, and, E, on each side of the key plates not requiring to be
special as heretofore, and considerable expense is thereby saved.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
The combination with uniform lining plates for tunnels or subways, of a key
plate made in two parts, shaped where they meet like reversed wedges, substantially
as and for the purposes hereinbefore described.
Dated this Fifteenth day of November 1892.
EDMUND HUNT,
Applicant's Agent.