Electricity: electrical systems and devices – Electrostatic capacitors – Variable
Patent
1981-08-24
1983-11-15
Griffin, Donald A.
Electricity: electrical systems and devices
Electrostatic capacitors
Variable
H01G 514
Patent
active
044159498
ABSTRACT:
A variable air trimmer capacitor has its annular interfitting electrodes movable axially with respect to each other by the helical threads of the rotor moving through the coils of a spring. Adjacent ones of the coils of the spring are axially offset from each other. The spring is confined in the barrel of a bushing which is of smaller diameter than the spring when in its relaxed state, and the coils of the spring are urged toward axial alignment when moved onto the threads of the rotor, thus assuring positive electrical contact between the rotor, spring and bushing.
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patent: 4035697 (1977-07-01), Arnold, Jr.
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Griffin Donald A.
Murata Corporation of America
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