Year: 1895

page_text: Date of Application, 6th Aug., 1895
Complete Specification Left, 10th Apr., 1896-Accepted, 18th May, 1896
I, CARL GUSTAF PATRIK DE LAVAL of 16 Handtverkaregatan, Stockholm,
Sweden, Doctor of Philosophy and Engineer do hereby declare the nature of this
invention to be as follows:-
The present invention refers to an improvement in water tube boilers of that kind,
which consist of a single continuous tube, in the one end of which water is pumped
in, while steam is taken out from the other end, and which moreover are provided
with magazine firing. In such boilers the magazine tube must be surrounded by a
part of the boiler water tube to get the necessary abstraction of heat. Now the
purpose of the invention is to admit of the raising and lowering of the magazine
tube and thus to control the thickness of the coal layer on the grate. With this
view I provide a spirally or helically wound tube as the connection between the
tube, surrounding the magazine and the remaining part of the boiler water tube,
said spirally or helically wound tube having its turns so thin wound and with so
large diameter in relation to the diameter of the water tube itself, that the
tube is acting as a torsion spring, during the raising or lowering of the magazine.
tube.
Dated this 6th dor of Avant 1805
JENSEN & SON,
77 Chancery Lane, London, W.C., Chartered Patent Agents.
I, CARL GUSTAF PATRIK DE LAVAL of 16A Handtverkaregatan Stockholm
Sweden Doctor of Philosophy and 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 :-
The present invention refers to an improvement in water tube boilers of that
kind, which consists of a single continuous tube, in one end of which water is
pumped in, while steam issues from the other end, and which moreover is provided
with magazine firing. In such boilers the magazine tube must be surrounded by a
part of the boiler water tube in order to obtain that abstraction of heat from the
magazine tube which is necessary to avoid its being burnt. Now the purpose of
the invention is to admit of the raising and lowering of the magazine tube, and
thus to control the thickness of the coal layer upon the grate. With this view
I provide a spirally or helically wound tube as the connection between the inner
coils or section wound upon the magazine and the remaining part of the boiler
tube, said spirally or helically wound tube having its few coils so separated by
wide spaces, and with so large a diameter in relation to the diameter of the water
tube itself, that it acts as a torsion spring during the raising or lowering of the
magazine tube.
In the accompanying drawing, a steam boiler with the improvement in question

page_text: is shown in vertical section. a is the continuous boiler water-tube, with the water
supply at b and the steam outlet at c. In the example shown, said boiler tube
consists of three cylindrical sections or coils; namely one external coil-section a¹
at the shell of the boiler, one internal coil section a' surrounding the coal
magazine d, for cooling it and one coil section a³ situated about in the middle
between the two coil sections a¹ and a².
In order to admit of varying of the thickness of the coal layer upon the grate e,
the coal magazine d is movable in the vertical direction, up and down, by means of
any convenient arrangement not necessary to be shown on the drawing. The
connection between the coil section a³, which is fixed on the magazine d so as
to follow its movements and the. coil section a³ (or a¹) which is unmovable consists
of a spirally or helically wound tube at, having its few coils so separated by wide
spaces cr interstices, and with so large diameter in relation to the diameter of the
tube itself, that this tube acts as a torsion spring, when moving the magazine up
and down. Thus a constant connection is provided between the several parts of the
boiler water-tube.
The blast-air flows into the space beneath the grate, through the opening f.
and the products of combustion leave the boiler through the opening g.
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 :-
1. In water tube boilers, the combination of a movable coal-magazine for con-
trolling the height of the coal layer on the grate, and a cooling tube coil section
fixed to and surrounding the magazine and forming a part of the water tube of the
boiler, substantially as set forth.
2. In water tube boilers, the combination of a movable coal magazine for con-
trolling the height of the coal layer on the grate, a cooling tube coil section fixed
to and surrounding the magazine and forming part of the watertube of the boiler,
and a spirally or screw-wound watertube composed of coils separated by spaces or
interstices and connected at one end with said cooling tube coil section and at
the other end with the fixed-boiler water tube, and adapted to act as a torsion
spring during the movements of the magazine substantially as and for the purpose
set forth.
3. In water tube boilers, the combination of the fixed water tube section a³, the
movable water tube section a³ surrounding the coal magazine d for cooling it, and
the spirally or screw wound water tube a composed of coils separated by spaces or
interstices and connected at one end with said cooling water tube a' and at the
other end with the fixed boiler water-tube section a³ and adapted to act as a torsion
spring during the movements of the magazine substantially as and for the purpose
set forth.
Dated this 10th love of Anvil 1000
JENSEN & SON,
77 Chancery Lane, London, W.C., Patent Agents.