Improvements in Blow-pipe Lamps.
Year: 1899

page_text: Date of Application, 18th Sept., 1899-Accepted, 11th Nov., 1899
COMPLETE SPECIFICATION.
Improvements in Blow-pipe Lamps.
We, PHILIPP HEINZ, of Karl-Friedrich Strasse, 63, Pforzheim, Germany,
Manufacturer, and JOHANN HEINZ, of 12, Kaiser Friedrich Strasse, Pforzheim,
Germany, Manufacturer, 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 an improved construction of blow-pipe lamps in which
the flame is automatically regulated by the air pressure in the blow-pipe.
In blow-pipe lamps as heretofore constructed the supply valve for the com-
bustible gas has been actuated by the expansion of an accordian-like vessel
contained in the lamp casing, which vessel in expanding actuates a loaded elbow
lever connected to the valve. According to the present invention the air under
pressure in the blow-pipe acts directly upon a piston or the like which in moving
raises or lowers the valve cone in, a corresponding manner.
On the accompanying drawing the said invention is shewn in two modifications.
Figs. 1 and 2 shew one construction, Fig. 1 being a vertical section of the lamp
with the valve closed; Fig. 2 shews the same section with the valve opened by
the air pressure. Fig. 3 shews a vertical section of the second construction;
Fig. 4 a sectional plan and Fig. 5 a diagram of the electrical circuit.
The soldering blow-pipe a Fig. 1 has as usual a branch pipe & which is con-
nected by a flexible tube c with the soldering lamp.
By the supply of air pressure a cap-like piston f situated in a cylinder is more
or less raised according to the strength of the air pressure, such as to the position
shewn at Fig. 2, the conical valve g, which is connected to f by a rod being at
the same time raised. On the air pressure diminishing, the piston f and
valve sink by their
9
own weight and the valve shuts off the gas
supply. A channel serves for carrying off the air when the piston f
has sunk so that the valve g closes. The water separator y. Fig. 1, serves the
purpose of separating any. moisture carried along by the air pressure, such as
saliva &c.
The funnel with inward turned edge underneath the piston f also serves for
the same purpose.
For protecting the interior of the lamp against dust, there is inserted in the
cup-shaped nozzle a perforated cup. The combustible gas enters through
the channels, and the dotted by-pass pipe 7, Fig. 1, serves as usual for the
supply of a constantly burning igniting flame. A disc d arranged within the
lamp serves as a guide for the stem of the conical valve g, and also regulates
the gas discharge.
In the second modification shewn at Figs. 3, 4 and 5, an electromagnet is
employed for controlling the valve.
In the upper half of the spherical lamp casing (which is formed of two halves
screwed together) a soft wrought iron core A is fixed by screws S. On this core is
mounted a solenoid R (consisting of 363 turns of copper wire of 04 m.m. diameter)
one end G of which passes out through the casing, being insulated from the lamp by

page_text: an ebonite sleeve while the other end. which is also insulated from the lamp casing,
is in conducting connection with the clamp I, Fig. 4.
The core A has a central passage throughout its length and through this passes
a brass stem F which carries at its upper end the conical valve E, while its lower
end is screwthreaded and carries a wrought iron disc P with locknut M.
A cylinder C is cast on to the lower half of the casing and contains a moveable
piston B with stem fixed to it. The cylinder is closed at top by an ebonite
stopper D which on the one hand prevents the entrance of dirt into the cylinder,
and on the other hand serves as a guide to the stem of the piston. The water
receptacle attached to the cylinder C serves for keeping the compressed air
supply free from moisture in order to prevent any oxidation of the cylinder.
The cup L which is filled with fine copper wire produces a gentle issue of the
gas, and the cock H serves to put the lamp entirely out of action in closing the
gas supply.
The blow-pipe (not shewn) has, as in the first arrangement, a branch pipe con-
nected by 'a caoutchouc tube with the branch pipe of the cylinder C, or with a
caoutchouc membrane. If now the workman blows into the blow-pipe the com-
pressed air therein will raise the piston 13 or the caoutchouc membrane, and the
stem thereof will come in contact with the wire G so that the electric circuit will
thus be closed, as indicated by the diagram Fig. 5. By this means the core A
becomes magnetised and attracts the disc P which consequently raises the valve E,
so as to allow the gas requisite for the blow pipe flame to issue, such gas becoming
ignited by a small constant by-pass jet at U. O is the gas supply branch. When
the blow-pipe action ceases the piston B drops, thereby breaking the circuit,
so that the dise P falls away from the electromagnet and the valve E closes by
gravity.
Instead of arranging the electrical contact device on the lamp as described,
it may be arranged on the blow-pipe.
Having thus particularly described and ascertained the nature of 'this inven-
tion and in what manner the same is to be performed, we declare that what
we claim is:-
1. A blow-pipe lamp which is automatically regulated by the air pressure in
the blow-pipe, wherein the valve regulating the gas supply is actuated by a piston
which is moved so as to open the valve by the air pressure supplied by the blow-
pipe, substantially as described.
2. A blow-pipe lamp which is automatically regulated by the air; pressure in
the blow-pipe, wherein the valve controlling the gas supply is actuated by an
electro magnet which is excited by the current of an electric circuit that is closed
by means of the air pressure of the blow-pipe substantially as described.
Dated this 18th day of September 1899.
ABEL & IMRAY,
Agents for the Applicants.