Improved Means and Pressure Apparatus for Clearing Gas Service Pipes of Residual Deposits.
Year: 1898

page_text: Date of Application, 2nd July, 1898
PROVISIONAL SPECIFICATION.
Improved Means and Pressure Apparatus for Clearing Gas Service
Pipes of Residual Deposits.
I, HARRY HERBERT JONES, Civil Engineer, of The Wandsworth and Putney
Gas. Light and Coke Company, North Street, Wandsworth, S.W., do hereby
declare the nature of this invention to be as follows:-
This invention has for object, clearing the gas service pipes of the residual
deposits by forcing a suitable dissolving agent through the pipes upon such
deposits by means of air pressure from a combined air and liquid reservoir.
For the purpose of this invention, I form a somewhat tall reservoir with a
partition plate near the lower part and thereby form a chamber into which a dis-
solving agent can be poured and the filling or charging aperture closed by a
screw or other plug. The partition plate has one or more holes to form a com-
munication between the air and liquid reservoirs. The chamber has an outlet
nozzle to which a length of flexible tubing can be affixed and this has at its free
end a tapered nose preferably of metal covered with rubber, the metal nose
having a grating or meshed liner for breaking the combined dissolving agent and
air at the outlet.
The air vessel is provided with a pump barrel in which a plunger can be
operated to draw in air and force it into the reservoir where it can be held in
reserve, a portion passing through the hole in the partition where an agitation
of the dissolving agent occurs, and a consequent saturation of the air which when
blown into a blocked service pipe has a combined action in breaking up the solid
deposit and simultaneously forcing it into the main pipe, or into the atmosphere
if the joints be loosened.
R. CORE GARDNER,
Patent Agent, 166, Fleet Street, London,
Agent for the said:
Harry Herbert Jones.
Improved Means and Pressure Apparatus for Clearing Gas Service
Pipes of Residual Deposits.
I, HARRY HERBERT JONES, Civil Engineer, of The Wandsworth and Putney
Gas. Light, and Coke Company, North Street, Wandsworth, S.W., do hereby
declare the nature of my said invention and in what manner the same is to be per-
[Price 8d.1
"

page_text: formed to be particularly described and ascertained in and by the following
statement:-
This invention has for object, clearing the gas service pipes of the residual
deposits by forcing a suitable dissolving agent through the pipes upon such
deposits by means of air pressure from a combined air and liquid reservoir.
For the purpose of this invention I form a somewhat tall reservoir with a
partition plate near the lower part and thereby form a chamber into which a dis-
solving agent can be poured and the filling or charging aperture closed by a
screw or other plug.
The partition plate has one or more holes to form a communication between the
air and liquid reservoirs.
The chamber has an outlet nozzle to which a length of flexible tubing can be
affixed and this has at its free end a tapered nose preferably of metal covered
with rubber, the metal nose having a grating or meshed liner for breaking the
combined dissolving agent and air at the outlet.
The air vessel is provided with a pump barrel in which a plunger can be
operated to draw in air and force it into the reservoir where it can be held in
reserve, a portion passing through the hole in the partition where an agitation
of the dissolving agent occurs, and a consequent saturation of the air which when
blown in'o a blocked service pipe has a combined action in breaking up the solid
deposit and simultaneously forcing it into the main pipe, or into the atmosphere
if the joints be loosened.
My invention will be clearly understood by reference to the annexed drawings.
Figure 1 Sheet 1 vertical section of the apparatus in its complete form.
Figure 2 plan section through a, a, of Figure 1. Figure 3 exterior elevation.
Figure 4, Sheet 2, shows in section a double or duplicate pump arrangement in
the reservoir, the head of the smaller pump being shaped for the cross handle of
the larger pump rod to fit when desired.
A, cylindrical reservoir. B, partition plate. C, dome of cylinder with filling
aperture closed by plug D. E, plunger cylinder secured to partition plate B and
by runner collar F to reservoir A. G, plunger connected by rod H to cross
handle I to enable it to be operated from outside the reservoir A such as when
placed on the ground with the foot plates J, J, folded down, as at Figure 3, on
which plates the operator can stand for obtaining the necessary grip when work-
ing the pump.
K, valve in plunger with inverted head having limited drop
motion by check bar L in a similar manner by the check bar M to that of the
valve N of the partition plate B. P, scarf ended pipe arranged just above the
bottom Q of the reservoir A and having its outer end provided with a tap R from
'which by union S and flexible tubing T, the charge can be directed where
required. U, cone or tapered nozzle on end of tubing T to fit within the end
of a blocked pipe which has to be cleared as referred to in the preceding. V, air
inlet to reservoir, and W apertures in partition B.
The operation is as follows:-A small quantity of tar dissolving agent in liquid
form, such as petroleum, is poured into the reservoir by the filling hole at C¹,
which agent drops on to the partition plate B and from thence it trickles through
the perforations W into the lower chamber X, the tap R being closed.
The apparatus thus charged can be taken to any tar blocked pipe and con-
nected by its nozzle, then by operating the handle, to charge the reservoir A with
air, and opening the tap R, the liquid solvent under pressure will be forced into
the blocked pipe, and the pipe be cleared either by driving the debris or residual
deposit into the main, or if the other end of the pipe be open into the atmos-
phere..
On Sheet 1 of the drawings I have shown a single air pump arrangement, but
on Sheet 2 I show a reservoir with two different capacity pumps, the larger being
for ordinary working and the smaller of shorter and more powerful stroke, such
as when an extra high pressure of air is necessitated, the cross handle I being
shaped to fit the rod of either pump at the will of the operator.

page_text: In the plunger G₁ of the smaller pump cylinder E¹, I have shown a flap or
dise valve Kabutting against the perforations of the plunger, as seen at
Figure 5, the lower valve N¹ being of the same kind as that shown on Figure 1.
All the valves may be of the flap or disc kind which more readily lend them-
selves to secure the air in the cylinder or reservoir than those of the tappet or
cup kind.
Both plunger cylinders E, E, are preferably within the one reservoir A, but
one may be fitted outside if found necessary with a branch connecting it to the
reservoir.
Having now particularly described and ascertained the nature of the said
invention, and in what manner the same is to be performed, I declare that what
I claim is:-
Ì. The apparatus shown on the annexed drawings in or from which air pressure
can be obtained and be caused to force a solvent of tar or tarry deposit or other
residues and remove same from contact with gas pipes, and the pressure remove
or blow out such deposit, as set forth.
2. An apparatus constructed as set forth and consisting of an air reservoir, a
solvent liquid reservoir, in communication by a perforated partition to which
the pump barrel is affixed and a scarf ended pipe in same for attachment of
outlet nozzle tubing, all as represented for the purpose described.
The 29th day of November 1800
R. CORE GARDNER,
Patent Agent, 166, Fleet Street, London,
Agent for the said;-
Harry Herbert Jones.