Valves and valve actuation – With correlated flow path – Tank
Reexamination Certificate
2002-03-08
2003-12-30
Hirsch, Paul J. (Department: 3754)
Valves and valve actuation
With correlated flow path
Tank
C251S077000, C126S038000
Reexamination Certificate
active
06669167
ABSTRACT:
BACKGROUND OF THE INVENTION
(a) Technical Field of the Invention
The present invention relates to an improved structure of a LPG tank valve, and in particular, an urging device within the valve of a LPG tank.
(b) Description of the Prior Art
FIG. 1
is a perspective view of a conventional LPG tank valve and a LPG tank. The valve
20
is connected to a stove
30
via a connection tube (not shown). The bottom end of the valve
20
is provided with a threaded connector
211
for mounting with the threaded head
11
of the LPG tank
10
. The needle valve
12
within the threaded head
11
is in engagement with an urging device
23
within the threaded connector
21
.
FIG. 2
is a sectional view showing the valve of LPG tank in a closed position. The bottom end of the rotating button
22
in aligned with the urging device
23
is provided with a press rod
24
, and the urging device
23
comprises a tube body
25
and a needle valve
26
. One end of the tube body
25
is vertically locked to the threaded connector
21
, and the needle valve
26
is mounted at the mouth of the threaded connector
21
to the vale
20
such that one end of the needle valve
26
protruded out of the threaded connector
21
is located below the rod
24
. When the valve
20
is connected to the LPG tank
10
, the tube body
25
forces open the needle valve
12
within the mouth
11
of he tank, at this instance, LPG fills out the space of the tube body
25
. If the rotating button
22
has not been rotated, the press rod
24
will not press the needle valve
26
, the valve
26
blocks LPG from escaping. When LPG is required, as shown in
FIG. 3
, the rotating button
22
is rotated downward to press down the rod
24
and the needle valve
26
is opened, the LPG via the inner chamber of the LPG valve
20
, from the outlet tube
27
of the valve, flows to the burner
30
. The conventional structure has the following drawbacks:
(1) After a period of use of the LPG tank valve, the inlet of the needle valve is accumulated with carbon residue, and dust, and the valve may not be restored to its closed position, and this may cause a LPG leakage or cause explosion to the burner.
(2) The needle valve on the LPG tank is not required as leakage from a LPG tank can be detected in the LPG supplier. Therefore, it is a waste of cost in manufacturing and increases the cost of material. Accordingly, it is an object of the present invention to provide an improved structure of a LPG tank valve which mitigates the above drawbacks.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide an improved structure of a LPG tank valve having a threaded connector mounted onto a LPG tank and a rotating button being provided to one end of the threaded connector, and an urging device being provided to the threaded connector, and the bottom end of the rotating button aligned with the urging device being provided with an urging rod, characterized in that the urging device includes a tube body, an urging rod and a spring, and one end of the tube body is vertically locked to the threaded connector, via the connector and the space of the valve, the tube body is provided with the urging rod, and the rod head of the urging rod is higher than the tube body and is protruded into the mouth of the LPG tank valve, and the lower end of the rod head is connected in series with a spring urged the wall of the tube body, and a gap is formed between the rod body of the urging rod and the wall of the tube body and when the valve is mounted onto the tank the bottom end of the tube body does not urge against the needle valve of the tank and only when the rotating button is depressed, the press down pushes the urging rod and the needle valve is forced to pen and the liquefied gas is released.
Yet another object of the present invention is to provide an improved structure of a LPG tank valve, wherein the accumulated carbon or dust will not be formed at the needle valve.
Other objects, and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawing.
REFERENCES:
patent: 3701363 (1972-10-01), Schuler et al.
patent: 3749356 (1973-07-01), Conley
patent: 3907490 (1975-09-01), Schaller
patent: 3924654 (1975-12-01), Buller et al.
patent: 4082993 (1978-04-01), Oakes
patent: 4128391 (1978-12-01), Braunstein
patent: 4667694 (1987-05-01), Dalton
patent: 5016611 (1991-05-01), Lai
patent: 5027871 (1991-07-01), Guenther
patent: 5584467 (1996-12-01), Harnett et al.
patent: 5868126 (1999-02-01), Long et al.
patent: 5911403 (1999-06-01), deCler et al.
patent: 5937895 (1999-08-01), Le Febre et al.
Hirsch Paul J.
Keasel Eric
Lei Leong C.
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