Play control for a threaded drive

Details Play control for a threaded drive Play control for a threaded drive

1981-07-27

1983-06-28

Perkey, William B.

Electricity: motive power systems

Motor-reversing

Armature or primary circuit control

354195, 350253, 350255, 318324, 318372, 318614, 318689, 192 2, 744248A, 24 20R, G03B 300, G02B 704, H02P 704

Patent

active

043902600

ABSTRACT:
The invention contemplates a precisely adjustable threaded mechanism, as for focus adjustment of an aerial camera lens, wherein inner and outer threaded members are normally in circumferentially continuous radially stressed play-free engagement to the extent of requiring a characteristic maximum torque for their rotary adjustment. One of these members is continuously excitable (with respect to the other) as to so incrementally change its circumferential extent with respect to the circumferential extent of the other of said members that their characteristic engagement torque is reduced from said maximum. And a rotary-drive torque of a level less than said maximum engagement torque but greater than the reduced engagement torque is operative to impart an incremental thread-advancing rotary drive, during such intervals as the engagement torque is thus reduced.

REFERENCES:
patent: 983047 (1911-01-01), Grant
patent: 2257610 (1941-09-01), Kraft
patent: 2363409 (1944-11-01), Gibson
patent: 2905289 (1959-09-01), Lee et al.
patent: 4182979 (1980-01-01), Douglas et al.

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