An Improved Apparatus for Preventing Explosions in Domestic Bath and Kitchen Boilers.
Year: 1894

page_text: Date of Application, 26th June, 1894
Complete Specification Left, 26th Mar., 1895-Accepted, 15th June, 1895
PROVISIONAL SPECIFICATION.
An Improved Apparatus for Preventing Explosions in Domestic
Bath and Kitchen Boilers.
GEORGE LUFF STOCKER, Manager of The Gem Water Filter Company
276 Portobello Road North Kensington, do hereby declare the nature of this
invention to be as follows:-
This invention has for its object the absolute prevention of all kinds of explosions
in bath and domestic boilers from whatever cause frost corrosion or otherwise by
means of a safety valve composed of 9 different parts. And the novelty of my
invention consists of four principal brass castings forming one complete safety valve
with an aperture running through the centre and the first principal casting with a
socket screw bottom has the upper end large & cup shape with an inner flange
made to receive four different layers of metal (or suitable material) in the centre
of which I place a blue mica disc on top of this I screw down my second principal
casting with as large an opening as the size will admit with a female screw running
all through the inside to admit of the third brass casting which is in the shape of a
wheel with a male screw that works from one end to the other in the centre of
which I place a spear pointed knife cutting each way and so regulated that the
moment any undue pressure comes upon this mica disc below, the knife cuts it
through the centre and so instantly relieves the strain that would otherwise burst
the boiler. This is again covered and protected by the fourth principal casting
that controls the escaping steam & water and conveys it wheresoever you may
desire for convenience of position.
1004
GEORGE LUFF STOCKER,
Manager of The Gem Water Filter Company,
276, Portobello Road, North Kensington, London.
An Improved Apparatus for Preventing Explosions in Domestic
Bath and Kitchen Boilers.
I GEORGE LUFF STOCKER Manager of The Gem Water Filter Company
276 Portobello Road North Kensington London 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 :-
The accompanying drawings is in full illustration of my invention and that it may
be the better understood "show
و"
Figure 1. as an elevational view.
Figure 2. as a sectional view.
Figure 3. union connection for iron pipe or lead soldering connection, that
escaping steam inay be conveyed to any more convenient position (such as the sink
for instance) in place of the ball top connection discharging it from the ball
Figure 1, thus giving choice to 3 different modes of outlet.
Figure 4, shows the knife to cut the mica disc when the given pressure is reached
by the steam in the boiler.

page_text: Figure 5. is the bound air tight blue mica disc which is cut by the knife
when the highest determined pressure has been reached by the steam.
My present invention relates to improvements in safety valves for kitchen
boilers with circulating hot water pipe connections at different heights for domestic
purposes.
In many instances the pipes for conveying water to dwelling house boilers, bath
or kitchen, are run in casings, or channels through which flows, and circulates, a
current of cold air, and in winter causes the water in these pipes to freeze, thus
stopping the supply of water to the boilers (or the pipes may become corroded)
and thus stop the flow of water between cistern and boiler, and there being no
intimation of this stoppage, the fire is lighted in the range, and the boiler
becoming intensely heated, the moment a small quantity of water is introduced,
steam is immediately generated and the pressure being greater than the plates
of the boiler will bear, the boiler bursts and most fatal, and disasterous must the
consequences be.
My invention is therefore devised with the object of preventing effectually these
disastrous accidents, and my invention in addition to being most reliable, is
particularly distinguished for its extreme simplicity, there being neither springs,
weights, or other mechanical appliance that can possibly get out of order.
In carrying out my invention I provide the principal body of the safety valve
Figure 1. marked A which is screwed into the boiler.
B. is the second main part of the safety valve screwed into A. Figure 1 and 2.
and holds the air tight mica disc Figure 5 with the washers G and F Figure 2. in
their proper place to make a firm joint. D Figure 2 and 4. is a screw knife
arranged in B Figure 2. E. Figure 2 and 4 which cuts the mica disc G. Figure 2.
and 5 when the mica disc is forced by undue pressure of steam against it which is
regulated to the exact pressure required whether it be 10 lbs. or 1,000 lbs.
according to the strength the boiler will stand.
K. in Figure 3 is an ordinary pipe attached to union should the position of the
valve not be convenient for the escaping water and steam when the disc is cut by
undue pressure.
G. Figure 5. represents a bound air tight mica disc which is clear to the inner
circle, marked on Figure 5. and from the inner to outer circle padded and made
air tight, to protect the mica diaphragm layers from imperfection, by exposure or
change of temperature, or handling in fixing, which otherwise would be impossible
(perfectly) to protect and to avoid the damage in tight screwing.
I do not confine myself to the precise details of form or proportion of materials,
neither the nature of metals which may be varied in size or quality more or less as
may be found desirable, in different situations or circumstances but
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
Firstly. The improved safety valve itself for preventing explosions in domestic
bath and kitchen boilers substantially as berein described with 3 different inter-
changing outlets for the steam discharge as shewn in the accompanying drawings.
Secondly. The improved mica disc bound air tight, and padded as herein
set forth, properly prepared and tested for the knife's action as fully shewn in
accompanying drawings.
Thirdly. The adjustable knife itself to cut the diaphragm, disc when the limit of
pressure is reached, in the boiler combining with the device both certainty, as well
as safety, substantially as described and illustrated.
Dated this 26th day of March 1905
GEORGE LUFF STOCKER,
276, Portobello Road, Notting Hill, London.