192 clutches and power-stop control – Stop mechanism – Safety device
Patent
1979-04-10
1981-02-24
Downey, Kenneth
192 clutches and power-stop control
Stop mechanism
Safety device
74521, F16P 322
Patent
active
042522285
ABSTRACT:
A mechanism for controlling either momentary or maintained, continuous operation of devices such as valves, presses, machines and other devices which require simultaneous use of two hands by an operator to prevent accidents and injury. The mechanism includes a moveable linkage formed from rigid links pivotally connected in a closed polygon, preferably a parallelogram. A pair of hand-controlled plungers, which are biased to return the linkage to its rest position when released, enable movement of the linkage to momentarily or continuously operate an electrical switch, pneumatic valve or other contact control device only when both plungers are depressed simultaneously. A raised surface for guiding movement of the linkage is included to prevent unintended or single-handed operation. Constant depression of one plunger with intermittent operation of the other, or sequential operation of the plungers, will not engage the contact or control device.
REFERENCES:
patent: 1676866 (1928-07-01), Maury
patent: 2171559 (1939-09-01), Higley
patent: 2171568 (1939-09-01), Johnson
patent: 2171583 (1939-09-01), Malott, Jr.
patent: 2215795 (1940-09-01), Pearson et al.
patent: 3605969 (1971-09-01), Cornu et al.
patent: 3728498 (1973-04-01), Aslanbayrak et al.
patent: 3815456 (1974-06-01), Braathen et al.
Downey Kenneth
Scovill Inc.
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