Geometrical instruments
Patent
1980-02-13
1982-06-29
McGlynn, Joseph H.
Geometrical instruments
339278C, 339177R, H01R 502
Patent
active
043369740
ABSTRACT:
An improved rotary joint which is embodied, in a preferred version, in an electrical coaxial rotary connector having relatively rotatable male and female housings defining an outer conductor and means defining an inner conductor. One of the housings carries silver-graphite contacts including an outer annular contact associated with the outer conductor and a centrally disposed disc-like contact associated with the inner conductor. Contact between the contacts of the one housing and conductor points on the other housing is provided by a relatively simple contact means in the form of a first centrally disposed bowed spring washer associated with the disc-like contact and an annular spring washer having a plurality of crest contact locations (waves) associated with the outer annular contact. The spring washers are both constructed of a hard conductor material such as berylium copper plated with, for example, silver and then with a tarnish resisting layer such as rhodium or gold. The wave contact causes the plating to wear but only at the crest contact locations maintaining partial conductivity directly between the remaining silver plate and silver-graphite contact.
REFERENCES:
patent: 1904241 (1933-04-01), Kammerer
patent: 2343306 (1944-03-01), Lear
patent: 2967216 (1961-01-01), Zablocki et al.
patent: 3408610 (1968-10-01), Clarkson
patent: 3786376 (1974-01-01), Munson et al.
patent: 4138604 (1979-02-01), Harmsen et al.
McGlynn Joseph H.
Microwave Development Labs. Inc.
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