Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1991-10-16
1993-11-23
Pellinen, A. D.
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
307113, 307326, B26D 500, H01H 3600
Patent
active
052647390
ABSTRACT:
A two-hand controller for preventing trigger tie-down (10) for preventing the tie-down of an activation control switch (36,38) on equipment provided with two activation control switches (36,38). The two-hand controller for preventing trigger tie-down (10) includes a power supply (20) for supplying low voltage power to the two-hand controller (10). A comparator (18) is provided for comparing a signal (166) associated with the operation of the activation controls. An optocoupler (164) is included for receiving an optical signal (168) and activating a pilot relay (118). A constant current circuit (24) is provided for regulating the magnitude of current. A logic circuit (16) is provided for processing the signals (74,76) delivered by the activation controls (36,38) for determining when the activation controls (36,38) have been activated within a selected period of time. An inverter (46) is provided to process the output of the logic circuit (16). A diode array (26) is provided for insuring a positive voltage supply to a voltage regulator (28).
REFERENCES:
patent: 3721833 (1973-03-01), Kramer
Acraloc Corporation
Krishnan Aditya
Pellinen A. D.
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