Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With rotor
Patent
1982-09-30
1985-10-01
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With rotor
324 73PC, G01R 3102
Patent
active
045448868
ABSTRACT:
A circuit board test fixture has a mount with slots for loosely receiving the marginal edges of a diaphragm. Sealing surfaces curve downwardly from the slots for the diaphragm to form a direct seal against when drawn tightly thereabout. Innermost faces of the mount are spaced outwardly from the marginal edges of a backing plate that supports the diaphragm and moves perpendicular thereto. The mount projects upwards from a vacuum chamber base that is hingedly connected to a connector housing. The mount will maintain a seal with the diaphragm for an operative vacuum chamber when the base is pivoted upwardly to almost an upright position.
REFERENCES:
patent: 4138186 (1979-02-01), Long et al.
patent: 4344033 (1982-08-01), Stowers et al.
patent: 4403822 (1983-09-01), Smith
Murray John D.
Weiss Sydney J.
Karlsen Ernest F.
M-Rel, Inc.
O'Shea Kevin D.
Schatzel Thomas E.
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