Fluid handling – Removable valve head and seat unit
Reexamination Certificate
2002-01-23
2003-03-11
Lee, Kevin (Department: 3753)
Fluid handling
Removable valve head and seat unit
C251S149600
Reexamination Certificate
active
06530394
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to a gas tank access and more particularly to an on-off switch structure of the gas tank.
2. Description of Related Art
As shown in
FIGS. 1 and 2
, a gas tank on-off switch
10
of the prior art comprises a main body
11
and a leakproof device. The main body
11
is provided in the interior with a retaining hook
12
, a locating inember
13
, a control bolt
14
disposed through the retaining hook
12
and the locating member
13
. A rotary knob
19
is mounted on the outer end of the control bolt
14
. The bottom of the main body
11
is fastened with a valve
15
in which a spring
16
, a guide tube
17
, and a stop member
18
are disposed. The prior art switch
10
is leakproof; nevertheless it is rather complicated in construction and is therefore not cost-effective. In addition, the leakproof device is not structurally independent of the main body
11
. As a result, the defective leakproof device must be replaced along with the main body
11
which is still in a good working condition.
BRIEF SUMMARY OF THE INVENTION
The primary objective of the present invention is to provide a gas tank on-off switch structure which is simple in construction and cost effective.
The on-off switch structure of the present invention comprises a main body and a leakproof member. The main body is provided with a rotary handle fastened therewith for controlling the flow of gas. The main body is in communication with the interior of the gas tank. The leakproof member is fastened with the main body and is formed of an elastic element, a plug, a fastening body, and a locating body. The plug is disposed in a through hole of the fastening body in conjunction with the elastic element. The fastening body is fastened to the main body such that the through hole of the fastening body is in communication with the interior of the gas tank. The leakproof member is structurally independent of the main body.
The features and the functions of the present invention will be more readily understood upon a thoughtful deliberation of the following detailed description of the present invention with reference to the accompanying drawings.
REFERENCES:
patent: 5553638 (1996-09-01), Home
patent: 5582201 (1996-12-01), Lee et al.
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