Electrical transmission or interconnection systems – Personnel safety or limit control features
Patent
1991-07-24
1993-08-10
Pellinen, A. D.
Electrical transmission or interconnection systems
Personnel safety or limit control features
307328, 307116, 3071414, 361181, 361189, 200600, 192131R, 192129A, 340562, 340573, 328 5, 328 7, H01H 926, H01H 900, F16P 320, H03K 1796
Patent
active
052352170
ABSTRACT:
In a preferred embodiment, a capacitive switch system including two capacitive switches which must be activated nearly simultaneously to operate a piece of equipment. When one switch is touched, a timing function is activated. If a predetermined length of time lapses before the other switch is touched, the other switch will be locked out. Both switches must then be released before the activation procedure is re-initiated. The components providing timed and anti-tie-down features, are integral to the circuitry of the switches and these as well as output relays are compactly housed in the switch housings to prevent tampering and circumvention of the safety features. The sensitivity of the switches is such that they cannot be activated by liquids.
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Hoberman, Stu; "Touch Module-This New Version Does Many Jobs"; Popular Science, Feb. 1973, pp. 124-125.
Crozier John H.
Fleming Fritz M.
ISB Ltd.
Pellinen A. D.
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