An Improved Transversely Corrugated Sheet Metal Air Pipe.
Year: 1892

page_text: Date of Application, 24th Oct., 1892
Complete Specification Left, 24th July, 1893-Accepted, 2nd Sept., 1893
PROVISIONAL SPECIFICATION.
An Improved Transversely Corrugated Sheet Metal Air Pipe.
I JOHN HOWARD PLANT of King Street Works Dudley in the County of
Worcester Manufacturer of Colliery Requisites do hereby declare the nature of
this invention to be as follows :-
Atmospheric air is usually conveyed into the workings of mines and foul air is
extracted therefrom by exhaustion, through sheet iron pipes made in suitable
lengths; at the one end of each length is a socket and at the other a spigot, and
these lengths are joined together in the workings as required by wedging the spigot
end of one pipe into the socket of another and so on. I purpose to make improved
pipes by passing the sheets of which they are to be made through corrugating
curving rolls thereby forming therein transverse corrugations; and particularly
introduce, at a suitable distance from the spigot, or if the spigot is dispensed with
into that end of the pipe itself, a corrugation in such manner that the socket may
be wedged up against it, so forming a closer joint and reducing leakage. Some air
pipes are made in sections the ends of which are fitted into each other and then
rivetted together, and I purpose to improve the efficiency of such pipes by making a
corrugation at a suitable distance at the end of a section for the other to be wedged
up against before rivetting.
Dated this Dond does of Dotober 1892
JOHN HOWARD PLANT.
COMPLETE SPECIFICATION.
An Improved Transversely Corrugated Sheet Metal Air Pipe.
I, JOHN HOWARD PLANT of King Street Works Dudley in the County of
Worcester, Manufacturer of Colliery Requisites 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 :-
Atmospheric air is usually conveyed through underground workings, and foul
air extracted therefrom by exhaustion, through sheet iron pipes or troughs. At
one end of each pipe is a socket (Fig. 1. H), at the other end a spigot (Fig. 1. S.),
and these pipes are united as required in the workings by wedging the spigot end
of one pipe into the socket end of another and so on. Some air pipes or troughs
are made in 2 or more sections the ends of which are joined by rivetting so that 2
or more sections form one pipe.
I propose to make improved pipes either all in one length or in sections, by using
sheets containing transverse corrugations (Fig. 2, in which M represents the socket,
and D D D D the transverse corrugations); and having the transverse
corrugation represented by Dat such a distance from the one end of the pipe as
to allow 2 pipes to be united in the workings as required by wedging that end of
the pipe into the socket end of another pipe,-the corrugation forming a shoulder
or abutment for the socket to fit closely around, and so producing a closer union,
reducing leakage and dispensing with the old fashioned spigot.
If the pipes are made in sections each section has a corrugation at a suitable
distance from its end for the end of the other section to be wedged up against
before joining by rivetting, so making a closer joint and reducing leakage.

page_text: Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what I
claim is
1. The use of the corrugation so placed as to form a shoulder for the. socket to
fit around when a union of 2 pipes is required.
2. The improvement in the joints of the sections by the use of corrugations as
hereinbefore described.
Dated this 22nd day of Jule 1893
JOHN HOWARD PLANT.