US3740146A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Operating means for use in fading mechanisms of motion picture cameras
Assignee: Robert Bosch Photokino GmbH
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Filing: 1972-02-23
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Granted: 1973-06-19
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Expires: 1992-02-23
Abstract
Abstract A fading mechanism for changing the size of the light-admitting aperture which is furnished by the diaphragm of a motion picture camera during the making of exposures with fade-in or fade-out effect has a control ring which is rotatable in a wall of the camera housing and is normally coupled to a gear of the diaphragm adjusting mechanism so that the user of the camera can adjust the diaphragm by rotating the control ring. A button which is movable axially of the control ring can shift the gear into mesh with a worm wheel which is rotated by the camera motor so that the diaphragm can be adjusted by the motor. The gear is disengaged from the worm wheel in automatic response to completion of a given number of exposures with fade-in or fade-out effect.
Inventors
- 👤 T Wilharm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:05
CPC Classifications
G; G03; G03B; G03B19/00; G03B19/18; G03B19/26; G03B9/00; G03B9/08
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
117 words
In a motion picture camera, a combination comprising an adjustable diaphragm defining a light-admitting aperture of variable size; motor-operated drive means; and fading means including adjusting means operative to adjust said diaphragm so as to gradually reduce the aperture size during the making of exposures with fade-out effect and to gradually increase the aperture size during the making of exposures with fade-in effect, and operating means comprising a first control member actuatable to thereby effect the operation of said adjusting means and a second control member actuatable to Thereby establish an operative connection between said drive means and said adjusting means, said control members having portions adjacent to each other manually engageable located immediately for one hand.
Claim 2
Dependent Claim
117 words
In a motion picture camera, a combination comprising an adjustable diaphragm defining a light-admitting aperture of variable size; motor-operated drive means; and fading means including adjusting means operative to adjust said diaphragm so as to gradually reduce the aperture size during the making of exposures with fade-out effect and to gradually increase the aperture size during the making of exposures with fade-in effect, and operating means comprising a first control member actuatable to thereby effect the operation of said adjusting means and a second control member actuatable to Thereby establish an operative connection between said drive means and said adjusting means, said control members having portions adjacent to each other manually engageable located immediately for one hand.
Claim 3
Dependent Claim
27 words
A combination as defined in claim 1, wherein said control members are coaxial with each other and said handgrip portions thereof are actuatable independently of each other.
Claim 4
Dependent Claim
146 words
In a motion picture camera, a combination comprising an adjustable diaphragm defining a light-admitting aperture of variable size; motor-operated drive means; and fading means including adjusting means operative to adjust said diaphragm so as to gradually reduce the aperture size during the making of exposures with fade-out effect and to gradually increase the aperture size during the making of exposures with fade-in effect, and operating means comprising a first control member actuatable by hand to thereby effect the operation of said adjusting means and a second control member coaxial with and closely adjacent to said first control member and being actuatable by hand to thereby establish an operative connection between said drive means and said adjusting means, said control members being actuatable independently of each other and one thereof being rotatable about its axis and the other thereof being movable axially of said one control member.
Claim 5
Dependent Claim
146 words
In a motion picture camera, a combination comprising an adjustable diaphragm defining a light-admitting aperture of variable size; motor-operated drive means; and fading means including adjusting means operative to adjust said diaphragm so as to gradually reduce the aperture size during the making of exposures with fade-out effect and to gradually increase the aperture size during the making of exposures with fade-in effect, and operating means comprising a first control member actuatable by hand to thereby effect the operation of said adjusting means and a second control member coaxial with and closely adjacent to said first control member and being actuatable by hand to thereby establish an operative connection between said drive means and said adjusting means, said control members being actuatable independently of each other and one thereof being rotatable about its axis and the other thereof being movable axially of said one control member.
Claim 6
Dependent Claim
74 words
A combination as defined in claim 3, wherein said one control member is said first control member and said adjusting means comprises a torque receiving element which is coaxial with said first control member and is movable by said second control member axially between a first position in which said element can receive torque from said first control member and a second position in which said element can receive torque from said drive means.
Claim 7
Dependent Claim
46 words
A combination as defined in claim 4, wherein said first control member and said torque receiving element are provided with cooperating male and female coupling means for rotating said element in response to rotation of said first control member in said first position of said element.
Claim 8
Dependent Claim
54 words
A combination as defined in claim 5, wherein said female coupling means comprises two sockets located diametrically opposite each other with reference to said axis and said male coupling means comprises two projections receivable in said sockets in two predetermined angular positions of said element and said first control member relative to each other.
Claim 9
Dependent Claim
34 words
A combination as defined in claim 4, wherein said drive means comprises a torque transmitting element which engages with and rotates said torque receiving element in said second position of said torque receiving element.
Claim 10
Dependent Claim
47 words
A combination as defined in claim 7, wherein said torque transmitting element comprises a worm wheel and said adjusting means further comprises a mobile diaphragm setting member operatively connected with said torque receiving element in each of said first and second positions of said torque receiving element.
Claim 11
Dependent Claim
32 words
A combination as defined in claim 4, wherein said torque receiving element comprises a first gear and said adjusting means further comprises a second gear in permanent mesh with said first gear.
Claim 12
Dependent Claim
22 words
A combination as defined in claim 4, further comprising means for permanently biasing said torque receiving element to said first position thereof.
References Cited (Backward Citations)
US3644025A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-18 | 1976-12-18 | 1977-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-18 | 1980-12-18 | 1981-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-18 | 1984-12-18 | 1985-06-19 | $7700.00 | Window Closed / Lapsed |