1981-12-17
1984-01-31
Punter, William H.
350563, G02B 706
Patent
active
044286511
ABSTRACT:
In binoculars including focusing means comprising an adjustable, rotatable focusing knob operatively associated with focus adjustment means, whereby rotation of the knob adjusts the focus adjustment means in a manner related to the distance between a viewer employing said binoculars and an object to be viewed, the improvement comprising first click-stop means operatively associated with the rotatable focusing knob, the click-stop means being effective to abruptly increase the force required to rotate the knob at a focus setting for a predetermined distance between the object to be viewed and the viewer.
REFERENCES:
patent: 975672 (1910-11-01), Bausch
patent: 1229117 (1917-06-01), Mihalyi
patent: 3138082 (1964-06-01), Schrumpf
patent: 3266367 (1966-08-01), Dowling et al.
patent: 3913113 (1975-10-01), Yamashita
patent: 4110005 (1978-08-01), Bohm et al.
Hulbert W. R.
Punter William H.
Swift Instruments, Inc.
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