Improvements in Compressor Pumps.
Year: 1898

page_text: Date of Application, 26th Sept., 1898
Complete Specification Left, 30th Jan., 1899-Accepted, 25th Mar., 1899
PROVISIONAL SPECIFICATION.
Improvements in Compressor Pumps.
WALTER ORBELL GREEN, 33, Boston Park Road, Brentford, Middlesex, Engineer,
do hereby declare the nature of this invention to be as follows:-
For the purpose of enabling force pumps (that class of force pumps in which air
is compressed by manual power to be liberated by the sudden turning on of a
cock, and used generally for clearing of gas services) to be constructed in light
materials and so being more portable, I propose elongating the barrel of the pump
until it passes completely through the reservoir or compressing chamber. Its
end here will be stopped and so shaped that a nut will clamp it to the bottom
plate of compressing chamber using a suitable washer to make all air tight. The
transverse footplate (upon which the workers feet are placed to obtain purchase)
may also be clamped on by this one nut. A running nut or collar upon the barrel
above the compressing chamber will screw upon a suitable screwed collar rigidly
attached to the top of the compressing chamber, so that the barrel may be securely
fastened both below and above the reservoir. The exit tube from the reservoir I
also attach similarly, running it completely through the chamber and securing it
both above and below. The air way into the exit tube and from the pump barrell
is provided by suitable apertures. Thus great rigidity is given to the reservoir
by means of these tubes which become struts or stays to prevent expansion of.
the chamber by the pressure. In both the plunger of the pump and in the lower
part of the barrel (within the reservoir) I provide valves of a suitable character,
using by preference disc valves of small diameter, with the contact surfaces
rounded or coned to ensure a complete closing of the air ways.
I may face these
valves with leather or rubber. Each of them is held against its seat by a spiral
spring so that their soundness is not wholly dependent upon the air pressure
behind them. I may also provide a spring or other valve which will allow the
compressed air to escape or blow off at a fixed pressure. The reservoir itself I make
by preference in a form of which the longitudinal section is somewhat pear shaped,
the barrel tube stay passing through it at the larger end, and the exit tube stay
at the smaller, but I may vary this.
Sentember 24th 1898

page_text: same is to be performed to be particularly described and ascertained in and by
the following statement:-
For the purpose of enabling force pumps (that class of force pumps in which
air is compressed by manual power to be liberated by the sudden turning on of a
cock, and used generally for clearing of gas services) to be constructed in light
materials and so being more portable, I arrange a portion of the barrel of the
pump within the reservoir or compressing chamber and clamp it to the bottom
plate of same.
The transverse foot plate (upon which the workers feet are placed to obtain
purchase) may also be clamped on by the one nut.
A running nut or collar upon the barrel above the compressing chamber and a
screwed collar rigidly attaching the top of the compressing chamber, so that the
barrel is securely fastened both below and above the reservoir.
The exit tube from the reservoir is attached similarly, running it completely
through the chamber and securing it both above and below. Thus great rigidity
is given to the reservoir by means of these tubes which become struts or stays to
prevent expansion of the chamber by the pressure. In both the plunger of the
pump and in the lower part of the barrel (within the reservoir) I provide valves of
a suitable character, using by preference disc valves of small diameter, with, the
contact surfaces rounded or coned to ensure a complete closing of the air ways. I
may face these valves with leather or rubber. Each of them is held against its
seat by a spiral spring so that their soundness is not wholly dependent upon the
air pressure behind them. I may also provide a spring or other valve which
will allow the compressed air to escape or blow off, at a fixed pressure.
The reservoir itself I make by preference in a form of which the longitudinal
section is somewhat pear shaped, the barrel tube stay passing through it at the
larger end, and the exit tube stay at the smaller, but 1 may vary this.
My invention will be clearly understood by reference to the annexed drawings.
Figure 1 plan of the apparatus showing the pear or egg shape of reservoir cap-
able of withstanding great internal pressure and such as can with facility be
secured in and to the framework of a bicycle without seriously interfering with
the pedalling action of the cyclist's legs when suddenly called from a distance to
clear the blocked mains or branches of a gas company's service pipes.
Figure 2 longitudinal section of the air reservoir and pump barrel to show my
particular arrangement of fitting and clamping the parts together to ensure great
strength as between the dome shaped roof and the bottom plate to resist internal
pressure.
The air reservoir is of egg shape in cross section and the sides A are bonded
to the dome B and the bottom C by the barrel D of the force pump, the lower part
of which passes through the reservoir where by a plug E and a tightening nut F
it is firmly held, as also the foot plate G on the exposed ends G₁, G¹, of which a
person can stand while operating the plunger H by the cross handles I, I, arranged
on the top of the plunger rod J, this being guided by the compound screw ferrule K
in a manner well known. The pump barrel is also secured to the dome B by the
compound ring or collar and the running nut L. M, air exit tube similarly fitted
by its stem N and nut P to the bottom plate C of the reservoir, the upper end of
the tube M being also fitted to the dome B by the compound ring and runner
nut Q. The tube M is internally threaded for the reception of a connection R
to which a pressure gauge S is affixed, the connection R being surmounted by a
tap T kept shut until the requisite air pressure in the reservoir is obtained. The
extension U from the tap T of flexible hose terminates in a short metal tube over
which is fitted a rubber nozzle V shown detached at Figure 3, which ferrule can
be forced into close contact with the open end of a pipe to be cleared with facility
and then by the tap T being suddenly opened, the compressed air will exert
sufficient power to remove any obstacle that may be in the main, branch, or
service pipe to which the rubber nozzle V may be fitted.

page_text: The flexible tube U may be of any desired length and in order to locate it close
to the apparatus such as when not in use, I clamp a ring like appliance W, see
Figure 4, to the pump barrel D with the ends W₁ open for the passage or insertion
of the flexible tube U as represented in dotted lines, the ends W₁ opening out
sufficiently for the tube U to pass when a slight push pressure is exerted by hand.
The plunger H has a spring closing valve X within it and the barrel D has a
non-return valve Y as shown.
Z is the safety or excess blow off valve affixed to the dome B.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I claim
is:
;
1. The portable apparatus as shown on the annexed drawings, the several parts
being arranged for action, as described.
2. A portable compressor pump for gas operatives consisting of reservoir A
with top B and bottom C fixed in relation to each other by the barrel D, a portion
of which is located within the reservoir, as and for the purposes specified.
3. A portable compressor pump for gas operatives, the combination of pump
barrel D and exit tube N partly within the reservoir A for fixing the top B and
the bottom C rigidly, as explained.
1000
να σαι και γ του.
H. GARDNER,
Patent Agent, 166, Fleet Street, London,
Agent for the said Walter Orbell Green.