Patent
1985-08-02
1986-12-16
Griffin, Donald A.
G03B 928
Patent
active
046293027
ABSTRACT:
A focal plane shutter apparatus having two single flexible shutter blades for respectively uncovering and then covering an exposure aperture to make an exposure are incorporated into a 35 mm camera. Each shutter blade has a driven end and an opposite free end with both free ends sliding in the same guide channels across the exposure aperture. Each of the shutter blades has its driven end retained by a special rotary structure. Each rotary structure is acted upon by an adjustable acceleration spring and by a weak carry-through spring. Each shutter blade and its respective rotary driving structure are smoothly and quietly stopped by respective pairs of rocking cams which coact during shutter blade overtravel. The rocking cam structures used for stopping may be reset by another respective pair of rocking cams which coact during almost all of a shutter rewind sequence. The kinetic energy transferred through each stopping pair of rocking cams is dissipated by friction or in winding a spring, or a combination of both. A special winding mechanism provides low winding forces and capping of the shutter blades during rewind.
REFERENCES:
patent: 2512815 (1950-06-01), Svensson
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patent: 2803181 (1957-08-01), Willcox
patent: 3491673 (1970-01-01), Forys
patent: 3511158 (1970-05-01), Nerwin
patent: 3646603 (1972-02-01), Wolfgang et al.
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patent: 4109265 (1978-08-01), Hashimoto
Morrison, R. A., "Rolling Surface Mechanisms", Machine Design, (Dec. 11, 1958), pp. 119-123.
Hain, K., "How to Design Rocking Mechanisms", Product Engineering, (Sep. 18, 1961), pp. 65-70.
One copy photo of the Fairchild Rapidyne 3-1/2 inch Rapidyne Shutter as referenced in the application, including six photos of the type of stopping mechanism as used in the above Fairchild shutter.
Griffin Donald A.
Hall William D.
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