Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With rotor
Patent
1985-12-02
1987-10-20
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With rotor
324 73PC, G01R 3102
Patent
active
047017007
ABSTRACT:
Circuit board testing apparatus includes combination comprising structure including two generally parallel plates defining a space therebetween to which vacuum is applicable, there being circuit test probes projecting toward said space, and associated with one or the other of the plates, the remaining plate adapted to receive a circuit board for circuit testing; pre-loaded, resiliently deflectible devices including captivated springs carried by one or the other of the plates, so that such devices project into said space; and seal means on the remaining plate to be engaged by the circuit board for positive pressure sealing in response to vacuum application to said spaced. As a result, the vacuum in said space effects such sealing as one of the other of the plates is relatively movable forwardly toward the other in response to such vacuum application, thereby to further resiliently load the preloaded devices and to cause the probes to engage circuit board circuitry only after such sealing has been effected.
REFERENCES:
patent: 4230985 (1980-10-01), Matrone et al.
patent: 4321533 (1982-03-01), Matrone
patent: 4536051 (1985-08-01), Smith et al.
Haefliger William W.
Karlsen Ernest F.
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