Safety lock-off throttle device

Details Safety lock-off throttle device Safety lock-off throttle device

1981-08-26

1984-04-24

Garrett, Robert E.

Motors: expansible chamber type

With motive fluid valve

Plural manual control stations

251 95, 251111, 173169, F15B 1304, F16K 3500, B23B 4504

Patent

active

044440910

ABSTRACT:
A safety device for a fluid operated tool features a throttle lever which is always freely movable but is normally rendered inoperable to effect tool actuation except in response to a consciously deliberate two step action wherein a first valve control must be actuated before an on-off valve controlling fluid flow may be operated by a second valve control in response to throttle lever operation to drive the on-off valve from a normally closed position to an open position establishing an open fluid flow condition for tool start-up.

REFERENCES:
patent: 2946315 (1960-07-01), Doeden
patent: 3357677 (1967-12-01), Tasker
patent: 3861476 (1975-01-01), Borsum

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