Improved Blow Pipe.
Year: 1890

page_text: Date of Application, 29th Nov., 1890
Complete Specification Left, '31st Aug., 1891-Accepted, 17th Oct., 1891
PROVISIONAL SPECIFICATION.
Improved Blow Pipe.
1, JOHN PITT BAYLY, of 18 Fulham Place, Paddington, in the County of
London, Patent Agent, do hereby declare the nature of this invention (a communi-
cation to me from abroad by William Shattuck, of Providence, Rhode Island, U.S.A.
Inventor,) to be as follows:-
This invention relates to an improved blow pipe, more especially adapted for the
use of jewellers, and the invention has for its object to so combine the pipe with
the gas, that a flame is continually burning at the end of the blow pipe.
By this invention the blow pipe, which consists of a tapering tube, is fitted at its
end with another pipe of larger diameter which passes over it and whose inner end
terminates in a hollow ball a convenient distance along the blow pipe. Another
pipe enters this ball at right-angles to the other one, and is fitted with a valve-
seating and ball-valve opening inwards. A flexible gas tube is applied to the
valved tube or pipe, so that gas entering through the valve passes between the
outer pipe and the inner blow pipe to the end thereof, where it burns. The valve-
seat has a small aperture through it, so that when the valve is closed sufficient gas
can escape through it to maintain a small flame. The valve is kept closed by
placing the blow pipe, when out of use, with the valve seat downwards, and is
opened to admit more gas when in use by turning the blow pipe over, so that the
valve is moved by gravity. The blow pipe thus constructed is used for the same
purposes, and in the same manner as the ordinary blow pipe.
Dated this 29th day of November 1890.
J. P. BAYLY,
Applicant.
COMPLETE SPECIFICATION.
Improved Blow Pipe.
I, JOHN PITT BAYLY, of 18 Fulham Place, Paddington, in the County of
London, Patent Agent, do hereby declare the nature of this invention (a communi-
cation to me from abroad by William Shattuck, of Providence, Rhode Island, U.S.A.
Inventor,) and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement :-
My invention relates more particularly to that class of blow-pipes termed
"mouth blow-pipes," which are used by jewellers and other metal workers in
soldering, and it consists essentially in the combination with the ordinary blow-pipe
of a mounted spherical valve adapted to automatically open and close the gas inlet
upon turning or vibrating the blow-pipe and an always-open by-pass through which
a small quantity of gas passes, so as to keep a small flame burning when the
implement is not in actual use.
Heretofore, so far as I am aware, the ordinary mouth blow-pipe has been
unprovided with means for automatically maintaining a continuously burning small
flame when the worker lays aside the implement temporarily, as in changing from
one piece of work to another, although I am aware that power blow-pipes com-
bining blast and gas-pipes have been provided with means for maintaining a small
flame when the blow-pipe is not in actual .use. By means of my improvement the
workman is greatly facilitated in the execution of his work.
In the appended sheet of drawings,
Fig. 1 is a side elevation in partial section of an ordinary blow-pipe provided

page_text: with my improvement the parts being in a normal position, the valve closing the
main inlet communicating with the main gas-supply.
.: no
Fig. 2 is a similar view of the upper portion of the device, the gas valve being
open'as in use. ''
2
Fig. 3 is a transverse sectional view taken on line of Fig. 2.
Fig. 4 is an end view of the valve-seat and casing.
Fig. 5 represents side and end views of the valve casing as adapted to be inserted
into a flexible gas-tube communicating both with the blow-pipe and gas-supply.
Fig. 6.shows the same in reduced scale when thus arranged and connected; and
Fig. 7 shows a modification of the manner of attaching the valve casing.
The following is a more detailed description of the invention illustrated by the
drawings.
A designates the blow-pipe complete provided with my improvement.
a indicates the suitably-bent air-tube. This tube as usually made is enlarged at
the inlet or free end a², and extends therefrom in a taper form.
bindicates a bent gas-tube somewhat larger in diameter than the corresponding
portion of the air-tube, having, say, a spherical-shaped enlargement d secured at
one end thereof. The air-tube extends through and is secured to the enlargement d
and passes forward centrally along the axis of the gas-tube b, but falling short of
the burner end or outlet c, substantially as usual.
At the centre of the sphere d and at right angles with the air-tube a, passing
through it is inserted and secured a casing m of thin metal. (See Figs. 1, 2, and 3.)
As drawn, the inner end of the casing is open and is in contact with the air-tube.
To the opposite end of the casing is fitted an end e provided with a horizontal
hole i, a concave seat e¹ for the ball-valve and a small longitudinal hole or opening.
through which a small quantity of gas continually passes to the burner.
In lieu of attaching the casing m to the end of the gas-tube b it can be removable
or independent of the tube, as shown in Figs. 5, 6, and 7. In such case the tube
should be provided with a semi-closed end or other equivalent means adapted to
hold the valve in check, yet at the same time affording a free passage for the gas.
In the arrangement shown in Fig. 6 the blow-pipe is provided with a short lateral
tube n adapted to be inserted into a short piece of flexible tube t'. The outer end
of said tube t¹ is forced over the rear end of the casing m, the latter in turn fitting
within the end of the rubber gas-tube t communicating with the gas-supply.
The casing m is provided internally with a ball-valve of suitable material, as
metal. The valve is somewhat smaller than the inner diameter of the casing.
In Fig. 7 the casing m is provided near the outlet end with a short inclined tube
communicating with the interior of the casing, the free end of the tube being
removably secured to or inserted into the short lateral tube n of the blow-pipe, the
arrangement being substantially as shown by Fig. 6, except that the inclined tube
is employed in lieu of the flexible tube t¹.
In using my improved blow-pipe A (assuming a small flame to be burning at the
eud c) the operator first takes the blow-pipe from a hook or other support therefor
and applies the open end a² to his mouth, at the same time slightly depressing the
opposite end of the blow-pipe, thereby causing the valve to roll from its seat'e',
and permitting the free passage of gas through the opening to the burner, the
operator meanwhile blowing air through the pipe a. The gas and air thus mingled
produce an intense heat, which, if directed to solder, speedily fuses it.
It will be seen that the pipe a keeps the valve in check, although pins passing
through the casing would answer equally as well, or even the perforated end' h
shown in Fig. 5.
When the workman has finished using the blow-pipe he simply returns it to the
hook or support, or any other position adapted to return the valve to its seat, thus
shutting off the gas and reducing the flame, although still permitting a small
quantity of gas to escape through the groove or by-pass s formed in the front end
of the casing, such gas serving to maintain a little flame at the end of the
blow-pipe.
KR.
P

page_text: In some instances I have provided the valve-chamber of the casing m with an
auxiliary or supplemental ball v', Fig. 1, having a smaller diameter than the
spherical valve t. The advantage resulting from this arrangement is that the
small ball when thus used makes less obstruction to the flow of gas through
the exit end of the casing. It also serves to accelerate the movement of the valve v
in passing to its seat, while at the same time it practically adds to the weight of
the valve in maintaining the latter in position when seated.
It will be seen that a single ball or valve having a weight equal to the combined
weight of the two balls would nearly or quite fill the valve-chamber, and thus
seriously obstruct the flow of gas past the valve when the device is in use, whereas
by the employment of the two balls the objections thus referred to are overcome.
I am aware that certain types of blow-pipes have been provided with devices for
keeping the gas ignited when the blow-pipe is not in use. Therefore I do not
broadly claim such improvement.
Having now particularly described and ascertained the nature of this my said
invention, and in what manner the same is to be performed, I declare that what I
claim is :
1. A blow-pipe of the class hereinbefore described, having a casing m communi-
cating with the interior of the pipe, and provided with an apertured valve-seat
arranged to admit gas into the casing, a spherical self-closing gravity-acting valve
arranged to travel freely in said casing, a stop adapted to prevent the valve from
leaving its chamber, and a small aperture formed in the casing through which gas
may pass uninterruptedly to the burner, substantially as set forth.
2. The mouth blow-pipe A hereinafter described consisting of an air-tube a,
a bent gas-tube b, enclosing a portion of the air-tube, an apertured casing m
secured to and communicating with the tube b and with a gas-supply, an apertured
end e, provided with a valve-seat e' secured to the inlet end of the casing and
further provided with an opening s, and a gravity-acting valve v mounted within
the casing, whereby a continuous supply of gas is admitted to the burner so as to
maintain a small flame where the blow-pipe is not in use.
3. The combination, with a mouth blow-pipe, having a gas inlet-tube n secured
thereto, of a shell or casing having inlet and outlet passages, an apertured end e,
having a valve-seat e¹ secured to the inlet end of the casing, a spherical gravity-
acting valve mounted in the casing, a small continuously open hole, as s, formed in
the outer end of the casing, and a gas-tube or tubes attached to the casing, substan-
tially as hereinafter described, and for the purposes set forth.
4. The combination, with a mouth blow-pipe, provided with a casing m, having
an apertured end e, formed with a valve-seat e' at its outer or inlet end, adapted to
communicate with a gas-supply, of a gravity-acting spherical valve mounted to
travel freely in said casing and adapted to fit the valve-seat, and an auxiliary ball
or sphere also mounted within the casing, substantially as shown and described and
for the purpose hereinafter set forth.
Dated this 29th day of August 1891.
J. P. BAYLY,
Applicant.