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US3757660A Expired / Lapsed US ⏱️ 0.0 years remaining

Photographic camera capable of making multiple exposures

Assignee: Minolta Co Ltd
•
Filing: 1972-12-22
•
Granted: 1973-09-11
•
Expires: 1992-12-22
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Abstract

Abstract A photographic camera capable of making multiple exposures on a single film frame, the camera being of the type in which the advance of a single frame of film and the cocking of the shutter are effected by a single winding operation. The camera is provided with a first gear member rotatable for transmitting the rotary movement of the winding operation to a cocking member of the shutter, a second gear member rotatable for transmitting the rotary movement of the winding operation to a film winding spool through a friction clutch means, a third gear member rotatable for transmitting the rotary movement of the winding operation to a film transporting sprocket by way of a clutch means, a push button member actuatable for disconnecting the clutch means, and a blocking member for maintaining the clutch means in the disconnected condition and blocking the rotation of the film winding spool in the forward film winding direction against the action of the friction clutch means. The camera may be placed in a condition ready for double exposures simply by pressing the push button member, and after completion of the shutter cocking, the film winding spool is automatically relieved from the blocking action of the blocking member and the clutch is connected for associating the shutter cocking mechanism again with the film winding mechanism.

Inventors

  • 👤 H Ueda
  • 👤 Y Kuramoto
  • 👤 T Kobori

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-29 14:11
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/42; G03B17/425

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 43 words
A photographic camera as set forth in claim 1, wherein said relieving member is rotatable with said second member for relieving the clutch means from the disengaging action of said blocking member upon completion of the shutter cocking operation by said first member.
Claim 2
Dependent Claim 43 words
A photographic camera as set forth in claim 1, wherein said relieving member is rotatable with said third member for relieving the clutch means from the disengaging action of said blocking member upon completion of the shutter cocking operation by said first member.
Claim 3
Dependent Claim 29 words
A photographic camera as set forth in claim 1, further comprising; a second relieving member for relieving the film winding spool from said blocking action of said stop member.
Claim 4
Dependent Claim 222 words
A photographic camera as set forth in claim 1, further comprising; a sprocket shaft securely supporting at one end thereof said third member and loosely fitted into a sprocket for movement between a first position and a second position, the sprocket shaft being biased to assume the first position by means of a spring; an annular groove formed on said sprocket shaft; clutch means provided between said sprocket shaft and said sprocket and adapted to be engaged when said sprocket shaft is in the first position and disengaged when said sprocket shaft is in the second position; a blocking member adapted to be engaged with said annular groove when said sprocket shaft is in the second position for blocking said sprocket shaft from returning to the first position under th influence of the spring; a spool shaft securely supporting said second member and loosely fitted in a spool cylinder for rotational movement therein; frictional clutch means providEd between said spool shaft and cylinder for transmitting rotational movement of said spool shaft to said spool cylinder; a ratchet gear movable in assocation with said spool cylinder; and a stop member biased to engage with said blocking member and adapted to be engaged with said ratchet gear for preventing the rotational movement thereof when said blocking member is in engagement with said annular groove.
Claim 5
Dependent Claim 38 words
A photographic camera as set forth in claim 5, wherein said stop member prevents rotation of said ratchet gear in the film advancing direction without blocking rotation in the reverse direction, when in engagement with said ratchet gear.
Claim 6
Dependent Claim 56 words
A photographic camera as set forth in claim 5, further comprising a means including an eccentric pin member provided on a flange which is integrally rotatable with said spool shaft for disengaging said blocking member from said annular groove when said blocking member is disposed within the path of rotational movement of said eccentric pin member.
Claim 7
Dependent Claim 120 words
A photographic camera as set forth in claim 5, wherein said annular groove is formed with two semicircular lower surfaces at staggered levels and with a stepped surface connecting said two semicircular surfaces, said blocking member being engaged with the higher semicircular surface of said annular groove when said operating member is pressed into the second position after completion of exposure and being engaged with the lower semicircular surface when said sprocket shaft completes half a revolution in association with the winding operation, said stepped surface pushing said blocking lever out of said annular groove when said sprocket shaft finishes a revolution and said first member completes shutter cocking, allowing the sprocket shaft to return to the first position thereof.

References Cited (Backward Citations)

US3621770A Cited
US3687039A Cited
US3650191A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1976-09-10 1977-03-12 1977-09-11 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1980-09-10 1981-03-12 1981-09-11 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1984-09-10 1985-03-12 1985-09-11 $7700.00 Window Closed / Lapsed

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