Year: 1899

page_text: 1, FRIEDRICH SPEIDEL, of Pforzheim, Baden, in the German Empire, Gold-
smith, do hereby declare the nature of this invention to be as follows:-
The object of this invention is to provide an improved gas blow pipe by means
of which the gas supply may be controlled at will and in which the gas supply
is normally cut off so that no gas can gain access to the main tube of the blow
pipe, while a small secondary or pilot flame or jet may be kept constantly burn-
ing so that the blow pipe is always ready for use.
into the gas inlet pipe of the blow pipe which in other respects is constructed
like an ordinary blow pipe, there is provided according to this invention, a
transverse passage or chamber closed at one end and open at the other end
and provided with a port or passage leading to blow pipe proper. Fitted to
slide within this passage or chamber is a valve which is forced outwards by a
spring so as to normally cut off the gas supply to the blow pipe.
When it desired to use the blow pipe, it is only necessary to press inwards
the projecting end or knob of the sliding valve, against the resisting action of
the spring, to cause perforations or ports therein to coincide with similar per-
forations, ports, or passages in the gas inlet pipe, so that the gas may freely
enter the blow pipe. When pressure on the valve is released, it will return,
under the expansive action of the spring to its normal position in which the
supply of gas to the blow pipe is cut off. In the gas inlet pipe is secured a
small gas tube, the discharge end of which is situated in close proximity to
flame orifice of the blow pipe where it forms a constantly burning gas jet, while
the main supply of gas is cut off from the blow pipe by means of the valve. By
pressing upon the valve as before described gas is admitted into the main gas
tube of the blow pipe, which becomes ignited by the pilot jet, the blow pipe
being then ready for use. By this arrangement the gas supply may be varied
by applying more or less pressure to the valve and a considerable saving of gas
is ensured.
In cases where the blow pipe is required to be in almost constant use with
a flame of a predetermined degree of heat I provide an arrangement for adjust-
ing the position of the valve and retaining it in the adjusted position; for this
purpose a rod is fitted to slide in a sleeve or socket on the blow pipe, the said
rod being attached to or engaging with the projecting end or head of the valve,
so that by adjusting the position of the rod in the sleeve or socket the valve can
be pressed more or less into its seat to regulate the passage of gas into the blow
pipe, and be fixed in its adjusted position by any suitable means such for ex-
ample as a pinching screw screwing into the sleeve or socket against the rod.
The rod may be secured by soldering or otherwise to the valve head or it
may be provided with a bent end to bear on the said valve head.
T: 02nd lox at October 1899.

page_text: Improvements in Blow Pipes.
I, FRIEDRICH SPEIDEL, of Pforzheim, Baden, in the German Empire, Gold-
smith, 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 this invention is to provide an improved gas blow pipe by means
of which the gas supply may be controlled at will and in which the gas supply
is normally cut off so that no gas can gain access to the main tube of the blow
pipe, while a small secondary or pilot flame or jet may be kept constantly burn-
ing so that the blow pipe is always ready for use.
I will describe my invention with reference to the accompanying drawings,
of which
Figure 1 represents an external elevation of the improved blow pipe,
Figure 2 is a longitudinal section of the same at a right angle to Figure 1.
Figure 3 is a section of the gas valve.
Figure 4 is a section of the valve seat with the valve fitted therein and
Figure 5 is a detached view of means for adjusting the position of the valve in
its seat.
Into the gas inlet pipe of the blow pipe which in other respects is con-
structed like an ordinary blow pipe, there is provided a transverse passage or
chamber c closed at one end and open at the other end and provided with a
port or passage leading to the blow pipe b. Fitted to slide within this passage
or chamber c is a valve d which is forced outwards by a spring c so as to normally
cut off the gas supply to the gas tube i of the blow pipe."
When it is desired to use the blow pipe, it is only necessary to press inwards
the projecting end or knob f of the sliding valve, 7, against the resisting action.
of the spring e to cause perforations or ports in the valve to coincide with similar
perforations, ports or passages in the chamber c of the gas inlet pipe a so that
the gas may freely enter the blow pipe. When pressure on the valve d is released
it will return under the expansive action of the spring e to its normal position
the supply of gas to the blow pipe being then cut off. In the gas inlet pipe a
is secured the inlet end of a small gas tube 7 the discharge end of which is situ-
ated in close proximity to the flame orifice of the blow pipe where it forms a
pilot jet which remains lighted while the main supply of gas is cut off from the
gas tube by means of the valve. By pressing upon the valve as before des-
cribed gas is admitted into the gas tube of the blow pipe, which gas becomes
ignited by the pilot jet the blow pipe being then ready for use. By this arrange-
ment the gas supply may be varied by applying more or less pressure to the
valve and a considerable saving of gas be ensured.
In cases where the blow pipe is required to be in almost constant use with
a flame of a predetermined degree of heat I provide an arrangement for adjust-
ing the position of the valve and retaining it in the adjusted position; for this
purpose a rod bent at right angles at one end is fitted to slide in a sleeve or
socket 7 on the blow pipe the said bent end of the rod being attached to or engag
ing with the projecting end or head f of the valve d so that by adjusting the
position of the rod in the sleeve or socket 7 the valve d can be pressed more or
less into its seat to regulate the passage of gas into the blow pipe and be fixed
in its adjusted position by means of a pinching screw m screwing into the sleeve
or socket against the rod k.
The rod may be secured by soldering or otherwise to the valve head for its
bent end may simply bear on the said valve head.

page_text: Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is:-
1. A gas blow pipe provided with a spring controlled valve whereby the
supply of gas to the said blow pipe is normally cut off substantially as herein-
before described.
2. In a gas blow pipe the combination with a spring controlled valve by
which the supply of gas to the blow pipe is normally cut off but which can be
operated by hand to admit gas to the blow pipe of an auxiliary gas tube for
supplying gas to a nozzle or pilot jet which can be constantly kept burning
to ignite the gas when admitted to the blow pipe substantially as hereinbefore
described.
3. In a gas blow pipe the combination with a spring controlled valve which
normally cuts off the supply of gas to the blow pipe and which can be operated
by hand so as to admit gas to the blow pipe, of means in connection with the
valve to retain it in position to which it has been moved substantially as herein-
before described.
4. The combination and arrangement of parts constituting the improved gas
blow pipe herein before described and illustrated by the accompanying drawings.
Dated this Bist day of January 1900.
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, London, W.C., Agents.