Valves and valve actuation – With means for blocking or disabling actuator – Released by non-valving actuator motion
Patent
1990-08-20
1991-12-03
Walton, George L.
Valves and valve actuation
With means for blocking or disabling actuator
Released by non-valving actuator motion
16112, 16DIG30, 16DIG36, 74523, 74526, 173170, 251105, 251113, F16K 3160, F16K 3502
Patent
active
050694219
ABSTRACT:
A safety device for a pneumatic tool having a body and an operation lever and a valve stem lowered by the operation lever has an axially movable pivot shaft by which the operation lever is pivoted to one end of the main body of the pneumatic tool. A stop is formed on the pivot shaft so as to move between a resting position and an operating position together with the pivot shaft. A conical coil spring is provided to urge the operation lever upward by its torsional action and the stop as well as the pivot shaft toward the resting position of the stop by its compressive action. A receiving chamber is formed in the operation lever at a position where it coincides with the stop when the stop is moved to the operating position by the depressing of the pivot shaft. When, in this state, the operation lever is pushed downward to cause the stop to enter the receiving chamber, the valve stem is lowered and the operation of the pneumatic tool starts.
REFERENCES:
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patent: 4018292 (1977-04-01), Roll et al.
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patent: 4267747 (1981-05-01), Wallace et al.
patent: 4444091 (1984-04-01), Jorgensen, Jr.
patent: 4619435 (1986-10-01), Biek
Kishi Katsunobu
Nose Kinya
Nitto Kohki Co. Ltd.
Walton George L.
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