Fluid handling – Line condition change responsive valves – Direct response valves
Reexamination Certificate
2001-05-15
2003-09-16
Buiz, Michael Powell (Department: 3753)
Fluid handling
Line condition change responsive valves
Direct response valves
C137S512150
Reexamination Certificate
active
06619324
ABSTRACT:
BACKGROUND OF THE INVENTION
The first aspect of the present invention is that the invention is about a non-return bias valve mechanism for a fluid pumping assembly installed for preventing fluid from flowing backward when pumping fluid with pressure, and further, the invention is about a non-return bias valve mechanism for a fluid pumping assembly which may be produced in minimum number of parts and in low price.
The second aspect of the present invention is that the invention is about a chemical solution high pressure pumping plug used for repairs of cracks occurred in concrete buildings and tunnels, to be more specific, the invention is about an adhesive agent high pressure pumping plug using a non-return bias valve mechanism of the first aspect.
The third and fourth aspects of the present invention are that the invention is about an automatic fixing type plug inserted and automatically fixed to a fluid pumping hole which is formed through spaces in a structure having spaces such as fissures, cracks, and crevices, and used for fluid pumping when pumping fluid such as adhesive agent, waterproof agent into the spaces through the fluid pumping hole with high pressure, and further, the invention is about an automatic fixing type plug for fluid pumping to be fixed liquid-tightly to the fluid pumping hole of the structure without a special work.
The fifth and sixth aspects of the present invention are that the invention is about a chemical solution pumping plug assembly and a chemical solution pumping technique using the assembly, to be more specific, a chemical solution pumping plug assembly and a chemical solution pumping technique using the assembly used for pumping chemical solution between reinforcing plate(s) located outside structures of such as cement concrete pillows or columns and structures.
The seventh, eighth, and ninth aspects of the present invention are that the invention is about a high pressure pumping instrument for fragile structures, which is inserted and fixed to a chemical solution pumping hole in fragile structures having spaces such as fissures, cracks, and crevices, and is used when pumping adhesive chemical solution into the spaces and/or fragile structures through the chemical solution pumping hole with high pressure, and a high pressure pumping technique for fragile structures using the instrument and a funnel of chemical fixing solution, and further, the invention is about a high pressure pumping instrument for fragile structures and a high pressure pumping technique for fragile structures using the instrument and a funnel of chemical fixing solution that can be used in repairing and mending fragile structures such as Tokyo Railroad Station existing since Meiji Era and Atomic-bombed Dome in Hiroshima, or, World Inheritance constructions of the Great Wall of China and Angkor Ruins in Cambodia.
RELATED ART
Conventional non-return bias valve mechanism for a fluid pumping assembly is explained with referring to the following
FIG. 5
as an example of grease nipple. The grease nipple comprises a nipple body
50
having cylindrical shape, a coil spring
70
for a non-return bias valve located inside the nipple body
50
, a steel ball
60
as the non-return bias valve for closing a pumping entrance of the nipple body
50
biased by the coil spring
70
for the non-return bias valve.
In this case, the steel ball
60
is the non-return bias valve and leakage of grease from pumping entrance could not be prevented completely because a contact with the pumping entrance is a line contact.
However, the leakage described above does not cause a serious problem for construction machines and cars because they are designed and produced for outside-use so a small amount of leakage does not cause serious one. Moreover, in JIS and ISO, harmful leakage is not admitted of course but a small amount of leakage is admitted.
However, in recent years, these nipples are used in wider ranges, for example, they are used as a part or instrument of pumping hardening (adhesive) agent and chemical solution such as epoxy resin or acrylate resin with high pressure. For example, fireproof and durability are demanded for concrete constructions and structures such as inner wall of tunnels, but they may be ruined and cause cracks because of changes of circumstances outside such as difference between high and low temperatures or winds and rains. When those cracks can be treated with only mending treatment or maintenance work, synthetic resin, cement paste, etc. are pumped therein. As examples, low adhesive epoxy, polyurethane, acrylate resin, etc. are the synthetic resin used for the pumping work and inorganic polymer cement paste, organic polymer cement paste, etc. are the cement paste used for the work.
Some of these resins contain strengthened fibers to add mechanical strength. These fibers are caught by the coil spring
70
inside and cause the spring
70
not to function or caught in between pumping exit of the nipple body
50
and the ball
60
to allow backflow of impermissible amount of resin. Further, in cases of repairing concrete surfaces of underground tunnels and tunnels at mountain areas, they may be used under 50 Mpa or higher pressure. In such cases, coil spring for non-return bias valve is pressed completely and can not restored due to pumping pressure and workers get injured by dispersed jets of chemical agent which is discharged from the valve.
And, when repairing concrete surfaces, enormous amount of nipples with non-return bias valve are consumed because nipple bodies are designed to be buried in repairing surfaces. Therefore, development of a non-return bias valve mechanism for a fluid pumping assembly that is in lower price and has no problems in performance is demanded.
Further, as nipples are used in wider ranges, needs for nipples with non-return bias valve in smaller size has increased, but conventional non-return bias valve mechanism has limits to make the size smaller.
Accordingly, a subject to be solved by the present invention is to supply a non-return bias valve mechanism for a fluid pumping assembly that is in lower price and has no problems in performance when used at high pressure.
Another subject to be solved by the present invention is to supply a non-return bias valve mechanism for a fluid pumping assembly that is capable of corresponding to downsizing of non-return bias valve.
Further, another subject to be solved by the present invention is to supply a non-return bias valve mechanism for a fluid pumping assembly that is capable of sealing almost completely resin which contains filler such as strengthening or reinforcing fibers.
Relevant arts of the third and fourth aspects of the present invention are as the following. For example, in concrete constructions and constructions such as tunnels, crevices by cracks, fissures, and rise of materials on surfaces are occurred by many reasons. When a treatment or maintenance work is enough with only repairing, the cracks, synthetic resin or cement paste is pumped in the cracks etc. epoxy resin, polyurethane, acrylate resin, etc. are those of the synthetic resin and inorganic polymer cement paste, organic polymer cement paste, etc. are those of the cement paste.
Conventional high pressure fluid pumping plug
110
shown in
FIG. 11
roughly comprises containing a nipple member
112
, a male screw member
114
, and a cylindrical rubber packing member
116
.
The nipple member
112
is formed integrally by a nipple head
112
a
and a nipple body
112
b
having hexagonal nut that fit to revolving means such as wrench. Outer form of the nipple head
112
a
is able to be closely connected to high pressure fluid pumping machines, for example, coupling for high pressure pump or nozzle. On periphery surface of the nipple body
112
b
, a groove
112
c
is provided as the nipple body
112
b
is able to be smashed off by a beating member such as a hammer. The groove
112
c
goes around the periphery surface of the nipple body
112
b
of the nipple member
112
, and its cross sectional form, for example, U, V, or trapezoidal fo
Onizuka Kaoru
Yamada Nagamasa
Buiz Michael Powell
Chong Leighton K.
Krishnamurthy Ramesh
NGN Co., Ltd.
Ostrager Chong & Flaherty (Hawaii)
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