Fire extinguishers – Portable vessels – Gas pressure
Reexamination Certificate
2001-09-18
2002-04-30
Doerrler, William (Department: 2832)
Fire extinguishers
Portable vessels
Gas pressure
C169S075000, C169S074000, C169S089000, C222S153110
Reexamination Certificate
active
06378618
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a control switch for a fire extinguisher, particularly to one having a change-over switch capable of being changed over to be pressed or not to be pressed against a press-in valve stem so as to actually control the fire extinguisher, thereby securing the safety of the fire extinguisher in use and being convenient in operation.
2. Description of the Prior Art
A known conventional fire extinguisher
1
, as shown in
FIG. 1
, includes a nozzle holder
10
, a valve seat
11
, a press-in valve rod
12
, a handle
13
, a pressure gauge
14
, a nozzle
15
, and an operating lever
17
. The valve seat
11
is disposed at an upper portion of the nozzle holder
10
and has a press-in valve rod
12
protruded on the valve seat
11
. The pressure gauge
14
and the nozzle
15
are respectively disposed at sidewalls of the nozzle holder
10
. The handle
13
is firmly mounted on the nozzle holder
10
and is pivoted with the operating lever
17
by a pivot axle
16
. The operating lever
17
has two holes
18
respectively disposed at its two opposite sidewalls and extended through by a lock pin
19
whose both ends are rested against two top edges
130
of two opposite sidewalls of the handle
13
to limit the operating lever
17
in a position impossible to be pressed downward to push a top of the press-in valve rod
12
to inject a fire-extinguishing agent out of the nozzle
15
so that the fire extinguisher
1
can achieve an effect of safety control. In using, after the lock pin
19
is drawn from the two holes
18
, the operating lever
17
can be pressed downward to push the top of the press-in valve rod
12
to inject the fire-extinguishing agent out of the nozzle
15
. However, when the fire extinguisher
1
is stopped using, the drawn-out lock pin
19
is often lost and is unable to be extended back to the two holes
18
to limit the operating lever
17
in the safe position, which is very dangerous because the operating lever
17
is very easy to be pressed downward to inject a fire-extinguishing agent out of the nozzle
15
in error.
SUMMARY OF THE INVENTION
The main purpose of the invention is to offer a control switch for a fire extinguisher capable of achieving a safety control of the fire extinguisher without need of a lock pin and convenient in operation.
A main feature of the invention is to provide a control switch for a fire extinguisher having a spring placed between a handle as well as an operating lever and pivoted by a pivot axle so that the spring has one end urged against an inner surface of the operating lever and the other end urged against an inner surface of the handle; a through hole formed in a top surface of the operating lever; a change-over switch pivoted by a pivot shaft and disposed within the through hole of the operating lever.
REFERENCES:
patent: 2541073 (1951-02-01), Kaufman
patent: 2736919 (1956-03-01), Nurkiewicz
patent: 3643691 (1972-02-01), Huthsing, Jr.
patent: 4684037 (1987-08-01), Gnutti et al.
patent: 5816331 (1998-10-01), Vivier
Tsai Wen-Hsiang
Yang Chen-Hsin
Doerrler William
Nguyen Dinh Q.
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