Improved Safety Guard for Porcelain or other Fragile Ignition Tubes used in Gas Engines.
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
Improved Safety Guard for Porcelain or other Fragile Ignition Tubes
used in Gas Engines.
EDMUND JAMES DAVIS, 71, Jeffreys Road, Clapham, S.W., Engineer, do hereby
declare the nature of this invention to be as follows:-
:-
This invention is intended to avert the danger of damage to the person when
porcelain, or other fragile ignition tubes, such as are used in gas engines, burst
when one is attending to them or in the vicinity; & it consists of a metal guard
with a peephole or peepholes of glass or other material, through which, the heated
tube may be seen, but strong enough to stop the fragments of tube, & of asbestos,
which surrounds the tube, on the tube bursing.
Dated this 24th day of September 1898.
Improved Safety Guard for Porcelain or other Fragile Ignition Tubes
used in Gas Engines.
EDMUND JAMES DAVIS, 71, Jeffreys Road, Clapham, S.W., 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 is intended to avert the danger of damage to the person when
porcelain or other fragile tubes, such as are used in gas engines, burst whilst
one is attending to them or in the vicinity, & it consists of a metal guard with
a peephole or peepholes of glass or other material, through which the heated
tube may be seen, but strong enough to stop the fragments of tube & asbestos,
which surrounds the tube, on the latter bursting. In Figs. 1 & 2 I give two
shapes of guards, both being specially adapted for the porcelain tube chimneys
of Messrs. Crossley Bros., well known Otto gas engines, with modifications they
may be fitted to any gas engine maker's chimney. The guard in Fig. 1 is
round & fits over the chimney & under the head of the screw used for tightening
the asbestos joints of tube, so the guard need not be removed to tighten said
joints the screw passes through hole A, the face B rests on the boss of the chim-
ney, through which the screw passes, & the rim B, covers the top of the chimney;
the holes Ca number of which are drilled round the guard-are the outlet
for the burnt gases from the chimney, the gases have to pass round the baffle
plate D, so the tube cannot be seen through the ventilating holes. E is a

page_text: projection on which a cap F is screwed holding the material H through which
the ignition tube may be seen with safety, this material may be glass, gauze
or mica or a combination of these. K is a ledge intended to ward off draughts
from the ventilating holes, a funnel may be fixed on the top if necessary to increase
the draught of chimney-as is necessary sometimes with poor gas. Another
form of guard may be simply a metal plate with a mica, glass or gauze peephole,
so that the tube may only be seen through the peephole or window, looking down
on the top, but unless tlie plate be sufficiently large in diameter the tube would
be visible between it & the chimney. Fig. 2 is another form of guard to fit
the same type of chimney, it is held on by spring clips A. & covers the top of
the chimney, the tube may be seen through C, made of glass gauze or mica;
this guard, instead of the upper cowl T, may be connected to a pipe of any
length, & the guard may fit closely over the chimney to increase the draught,
the pipe having if necessary a telescopic joint for raising & lowering the guard.
Of course the form of these guards may be varied in many ways & I do not bind
myself to the shape of the guard.
Having now particularly described & ascertained the nature of my said inven-
tion, & in what manner the same is to be performed, I declare that what I
claim is.
1. A guard for porcelain or other fragile ignition tubes as used in gas engines,
so constructed that looking down on the top of it the tube may only be seen
through a peephole or peepholes of glass, gauze or mica, or any combination
of these materials.
2. A guard for porcelain or other fragile ignition tubes, as used in gas engines,
so constructed that the tube may be seen only through a peephole or peepholes
of glass, gauze or mica or any combination of these materials.
3. A guard for porcelain or other fragile ignition tubes, as used in gas engines,
in which a peephole or peepholes are made of glass, gauze or mica or any
combination of these materials, through which the tube may be seen with safety.
Dated this 19th day of June 1899.