Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With rotor
Patent
1989-06-23
1991-05-07
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With rotor
73663, 73860, G01R 3102, G01N 2900
Patent
active
050140000
ABSTRACT:
A fixture for securing a plurality of circuit boards during vibratory testing is shown, wherein the fixture comprises a first end fixture member having a first wall surface, and a second end fixture member space from the first end fixture member. The second end fixture member has a second wall surface facing the first wall surface, and the first and second end fixture members are relatively movable so as to very the spacing therebetween. Each of the first and second wall surfaces includes a plurality of spaced parallel notches for securing the opposite edges of a circuit board, and each of the notches is to have resilient characteristics to accommodate dimensional variations between similar circuit boards and an included angle in a range of 110.degree. to 130.degree. in order to secure a circuit board so that it is free to vibrate in a free-free manner during the vibratory testing. The fixture is also rigidly secured to a source of vibratory movement capable of providing one or more predetermined frequencies of vibration. This universal fixture can be utilized to support a virtually unlimited variety of circuit boards and cards as a result of its simple adjustability and resilient support notches.
REFERENCES:
patent: 893875 (1908-07-01), Schneider
patent: 1249207 (1917-12-01), Ruff
patent: 1336610 (1920-04-01), Borchers
patent: 2838971 (1958-06-01), Shekter
patent: 3675299 (1972-07-01), Sherrill
patent: 3826483 (1974-07-01), Siegel
patent: 4061323 (1977-12-01), Beekenkamp
patent: 4342449 (1982-08-01), Illmann et al.
patent: 4566839 (1986-01-01), Butler
patent: 4603587 (1986-08-01), Kimball et al.
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