Improvements in Steam Boilers.
Year: 1890

page_text: Date of Application, 27th Dec, 1890
Complete Specification Left. 23rd Apr.. 1891-Accepted, 23rd May, 1891
PROVISIONAL SPECIFICATION.
[Communicated from abroad by JOSEPH C. PLATT, of Waterford, Saratoga, New
York, United States of America, Manufacturer.]
Improvements in Steam Boilers.
I, HENRY HARRIS LAKE, of the firm of Haseltine, Lake & Co., Patent Agents,
45 Southampton Buildings in the County of Middlesex, do hereby declare the
nature of this invention to be as follows:-
My invention relates to improvements in that class of vertical boilers having a
series of water-circulating tubes depending from the crown-sheet. Such tubes are
closed at their lower ends and at their upper ends communicate with the interior of
the water-chamber and heretofore much difficulty has been experienced in
emptying the water from the tubes when the boiler was not in use or was being
cleaned.
My invention consists in providing a boiler so constructed with supporting
trunnions and mounting the same in suitable bearings so that the boiler can be
easily turned on such trunnions from its normal vertical position to a horizontal or
inverted position to cause the water to flow from the tubes by gravity and allow of
easy access to the tubes when it is desired to clean them.
Dated this 27th day of December 1890.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Steam Boilers.
1, HENRY HARRIS LAKE, of the firm of Haseltine, Lake & Co., Patent
Agents, 45 Southampton Buildings in the County of Middlesex, 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 object of my invention is to provide a steam-boiler, having depending water-
tubes or loops, permanently closed at their lower ends, with means for easily and
quickly discharging the water from such tubes.
Fig. 1 of the drawings is a view in side elevation of a trunnion-supported boiler
tipped or turned from a vertical to a horizontal position..
Fig. 2 is a central vertical section of the same in an upright position, taken
through the trunnions and trunnion-supports, showing some of the depending
tubes.
Figs. 3 and 4 are respectively views in side elevation and central vertical section
of one of the depending tubes or loops detached.
A and B are respectively the outer and inner shells of the boiler.
The crown-sheet, C, is provided with numerous threaded apertures adapted to
receive the upper threaded ends of the water-tubes, E, which depend from and are
supported by the crown-sheet.
Coal is admitted through the supply tube, D, to the fire-grate, F, around and
above which the tubes are arranged to receive heat therefrom and from the
products of combustion, as they pass from the fire out through suitable flues and
pipes, not shown.
The tubes or loops are in the form of the "Bundy radiator loop."

page_text: These tubes have their inlet and outlet in one and the same end, as at G,
Fig. 4.
The lower end is closed and the water circulates by passing down one channel, G¹,
and up the other, G².
The water in the channel subjected to the greater degree of heat rises, while that
in the cooler channel falls, thus establishing a current through the loop.
To establish such circulation it is necessary that the open end of the tube or loop
should be the upper end; and the upper end is threaded and inserted in the crown-
sheet to communicate with the water-space in the boiler.
It is apparent therefore that the tubes will always be filled with water so long as
there is water in the boiler above the level of the crown-sheet; also that the tubes
cannot be emptied by drawing the water from the boiler nor in any other convenient
manner, except by inverting the tubes.
In the cold season the water in the tubes would freeze and destroy them if for
any reason the fire should be withdrawn and water left in the tubes.
It is also of advantage to be able to empty the tubes or loops for cleaning or
repairing.
By providing a boiler having depending water-tubes closed at the lower ends
with central trunnions, H, secured to the outer shell as by rivets, H', and mounting
such trunnions in bearings upon suitable supports, J, I am able to empty all the
tubes at once by turning the boiler from the vertical to a horizontal or partially
inverted position, first uncoupling the water or steam connections, not shown in the
drawings, the movement of the boiler being indicated by dotted lines.
The steam-pipe, K, leading from the top of the boiler, may be connected in any
known manner with a steam-supply pipe and the water-supply pipe may be coupled
through one of the trunnions, made hollow and connecting with the interior of the
boiler, as shown in Fig. 2.
It is characteristic of my improvement that the tubes can be entirely emptied by
the rotation of the boiler, a result never before attained.
Having now particularly described and ascertained the nature of the said
invention and in what manner the-same is to be performed, as communicated to me
by my foreign correspondent, I declare that what I claim is:
In a steam-boiler, the combination with a series of depending water-tubes or
loops closed at their lower ends and opening at their upper ends into the water-
space of boiler supporting trunnions; and trunnion-supporting bearings, whereby
the water-tubes can be entirely emptied, substantially as described.
Dated this 23rd day of April 1891.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.