An Improved Method of Constructing Tubular Coils.
Year: 1893

page_text: Date of Application, 13th Sept., 1893
Complete Specification Left, 13th July, 1894-Accepted, 8th Sept., 1894
PROVISIONAL SPECIFICATION.
An Improved Method of Constructing Tubular Coils.
1, GEORGE LAWRENCE, of 13 Stanley Gardens, Acton, in the County of
Middlesex, Engineer, do hereby declare the nature of this invention to be as
follows:-
This invention relates to the construction of tubular coils for various purposes
for which such coils are now or may be used and the object of the invention is to
render it possible to obtain coils of great diametrical breadth in a simple and
effective manner, and at comparatively small expense.
The invention consists in constructing such coils of or from a number of annular
discs each having its inner diameter equivalent to the inner or narrower diameter
of the coil, and its outer diameter equivalent to the outer or extreme diameter of
the coil. These discs are severed across preferably on a radial line. The discs
are connected in pairs either along their outer or their inner edges and are curved
helically in such a manner that the two severed edges of each disc no longer lie
in the same plane but are displaced perpendicularly to the plane of the discs for
an amount equivalent to the pitch of the coil whether the same is to consist of but
one helix or of more than one. Each pair of discs may then be attached by one
pair of the severed edges to the one pair of the severed edges of the next pair of
discs and thus a coil may be constructed of an indefinite length according to the
number of pairs of discs so employed. Where the discs have been connected in
pairs at their outer edges, they may now be connected at their inner edges, each
disc to that next to it of the adjacent pair, and where the discs have been con-
nected in pairs at their inner edges they may now in a similar manner be connected
at their outer edges, each disc to that next to it of the adjacent pair.
It will be understood that the above description does not necessarily imply that
the order of junction must be followed, the discs, having been secured, might be
connected to form two continuous coils, and the one wound on the other to be
afterwards connected at the inner and outer edges.
By suitably dishing the plates any suitable shape in longitudinal section of the
coil may be arrived at. Any shape may be chosen for the annular discs, both for
the inside and for the outside edges. The discs may be corrugated or embossed,
punched or otherwise made as regards their surfaces and made out of plain, or
perforated metal or wire cloth or gauze or of any suitable material stretched or
strengthened on frames or otherwise in any suitable way according to the purpose
for which the coil is intended. Distancing and strengthening stays and baffles
may be used where necessary.
In place of connecting the discs as before described by which a coil is made of
a longitudinal tubular character with a helical wall, the coil may be made helically.
tubular by connecting the inner edge of each disc to the same disc as that to which
the outer edge of the respective disc is connected.
Dated this 13th day of September 1893.
K. HADDAN,
Agent to Applicant.

page_text: An Improved Method of Constructing Tubular Coils.
I GEORGE LAWRENCE of 13. Stanley Gardens, Acton, in the County of
Middlesex, 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 :-
This invention relates to the construction of tubular coils for various purposes
for which such coils are now or may be used and the object of the invention is to
render it possible to obtain coils of great diametrical breadth in a simple and
effective manner and at a comparatively small expense.
The invention consists in constructing such coils of or from a number of annular
discs A each having the diameter of its inner edge equivalent to the inner or
narrower diameter of the coil, and the diameter of its outer edge equivalent
to the outer or extreme diameter of the coil. These discs are severed across
preferably on a radial line B. The discs are connected in pairs either along
their outer edges C or their inner edges D and are curved helically in such
a manner that the two severed edges B of each disc no longer lie in the same
plane but are displaced perpendicularly to the plane of the discs for an amount
equivalent to the pitch of the coil whether the same is to consist of but one helix
or of more than one. Each pair of discs may then be attached by one pair of the
severed edges B to the one pair of the severed edges of the next pair of discs and
thus a coil may be constructed of an indefinite length according to the number of
pairs of discs so employed. Where the discs A have been connected in pairs at
their outer edges C, they may now be connected at their inner edges D each disc
to that next to it of the adjacent pair and where the discs have been connected in
pairs at their inner edges D, they may now in a similar manner be connected to
their outer edges C, each disc to that next to it of the adjacent pair.
It will be understood that the above description does not necessarily imply that
the order of junction must be followed, the discs, having been secured, might be
connected to form two continuous coils, and the one wound on the other to be
afterwards connected at the inner and outer edges D. C. respectively.
By suitably dishing the plates any suitable shape in longitudinal section of the
coil may be arrived at. Any shape may be chosen for the annular discs both for
the inside and for the outside edges. The discs may be corrugated or embossed,
punched or otherwise made out of sheet metal as in Figs. 4 and 5 to form a pair
of discs connected at their outer or inner edges and left corrugated or flat as
regards their surfaces and made out of plain or perforated metal or wire cloth
or gauze or of any suitable material stretched or strengthened on frames or
otherwise in any suitable way according to the purpose for which the coil is
intended. Distancing and strengthening stays and baffles may be used where
necessary.
In place of connecting the discs as before described and illustrated in Fig. I
by which a coil is made of a longitudinal tubular character with a helical wall, the
coil may be made helically tubular by connecting the inner edge D of each disc A
to the same disc as that to which the outer edge C of the respective disc is con-
nected as shown in Figs. 2 and 7 or the same may be made into a double tube as
in Fig. 6 by suitable shaping of the discs.

page_text: Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed I declare that what I
claim is:
The method of constructing tubular coils substantially as described and
R. HADDAN,
Of the Firm of Herbert Haddan & Co.,
18, Buckingham Street, Strand, London, W.C., Agent for the Applicant..