Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With rotor
Patent
1985-03-19
1986-12-02
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With rotor
324 73PC, G01R 3102
Patent
active
046267794
ABSTRACT:
Improved spring-stops for a bi-level test fixture of the type that includes an electronic circuit device receiving face moveable between in-circuit and functional testing levels of a probe support plate are disclosed. A spring-loaded plate is provided below the probe support plate, and a plurality of elongated rods that extend between the electronic circuit device receiving face and the spring-loaded plate are provided for transferring the resilient force of the spring-loaded plate to the electronic circuit device receiving face. The transferred resilient force opposes the force exerted on the electronic circuit device receiving face from either operator or automatic testing equipment selectable vacuum levels such that the electronic circuit device receiving face moves to a selected one of the incircuit and functional testing levels. The rods are individually friction-fit for reciprocating motion in a low coefficient of friction and low compressive strength bushing. Each bushing is friction-fit into a corresponding opening provided therefor in the probe support plate. The low compressive strength and low coefficient of friction material of the bushings normalizes reciprocating rod motion induced strain in such a way as to substantially eliminate rod seizing while maintaining an air-tight seal.
REFERENCES:
patent: 3676776 (1972-07-01), Bauer
patent: 3757219 (1973-09-01), Aksu
patent: 3891924 (1975-06-01), Ardezzone et al.
patent: 4055805 (1977-10-01), Ardezzone
patent: 4056777 (1977-11-01), Roch
patent: 4099120 (1978-07-01), Aksu
patent: 4112363 (1978-09-01), Morrison et al.
patent: 4115735 (1978-09-01), Stanford
patent: 4164704 (1979-08-01), Kato et al.
patent: 4357062 (1982-11-01), Everett
patent: 4536051 (1985-08-01), Smith et al.
Karlsen Ernest F.
Pylon Company, Inc.
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