US3673935A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drive system for a reflex member
Assignee: Polaroid Corp
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Filing: 1970-11-02
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Granted: 1972-07-04
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Expires: 1990-11-02
Abstract
Abstract A lost-motion connection between a drive member and a reflecting member mounted in a camera of the single-lens reflex type. The reflecting member is mounted for movement between first and second positions and the lost-motion connection therebetween includes a crank mounted on the drive member for limited rotation relative thereto and a spring having one end connected to the crank and its other end connected to the drive member. Should there be any interference with the reflecting member as it is being driven to the second position, the lost-motion connection allows the energy of the drive to be stored by the spring rather than being utilized in an attempt to drive the reflecting member thereby preventing an overload on the camera''s motor and/or battery. Upon removal of the interference, the energy stored in the spring is utilized to drive the reflecting member toward the second position.
Inventors
- 👤 Edward H Coughlan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:18
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/48; G03B17/50; G03B17/52; G03B19/00; G03B19/02; G03B19/12
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
87 words
Photographic apparatus comprising: reflecting means mounted within said apparatus for movement between first and second positions; drive means for moving said reflecting means between said first and second positions; and force transmitting means coupled between said drive means and said reflecting means, said force transmitting means including means operable as a result of interference of said movement of said reflecting means between said first and second positions for disenabling said drive means from moving said reflecting means toward said second position until said interference has been removed.
Claim 2
Dependent Claim
87 words
Photographic apparatus comprising: reflecting means mounted within said apparatus for movement between first and second positions; drive means for moving said reflecting means between said first and second positions; and force transmitting means coupled between said drive means and said reflecting means, said force transmitting means including means operable as a result of interference of said movement of said reflecting means between said first and second positions for disenabling said drive means from moving said reflecting means toward said second position until said interference has been removed.
Claim 3
Dependent Claim
29 words
Photographic apparatus as defined in claim 1 wherein said means actuable in response to interference drives said reflecting means toward said second position upon the removal of the interference.
Claim 4
Dependent Claim
18 words
Photographic apparatus as defined in claim 2 wherein said means actuable in response to interference include lost-motion means.
Claim 5
Dependent Claim
52 words
Photographic apparatus as defined in claim 3 wherein said lost-motion means includes means for storing a portion of the energy of said drive means during the period that the interference is present, said stored energy providing a force for moving said reflecting means toward said second position upon removal of the interference.
Claim 6
Dependent Claim
41 words
Photographic apparatus as defined in claim 2 wherein said drive means include a shaft and said force transmitting means include coupling means for coupling said reflecting means to said shaft for rotational movement of said shaft relative to said reflex means.
Claim 7
Dependent Claim
33 words
Photographic apparatus as defined in claim 5 wherein said means actuable in responsive to interference include resilient means having one end attached to said shaft and another end attached to said coupling means.
Claim 8
Dependent Claim
37 words
Photographic apparatus as defined in claim 6 further including stop means located on said shaft and adapted to cooperate with said coupling means for limiting the degree of relative rotation between said reflecting means and said shaft.
Claim 9
Dependent Claim
31 words
Photographic apparatus as defined in claim 7 wherein said stop means arrests rotation of said reflecting means relative to said shaft prior to said reflecting means passing beyond said second position.
Claim 10
Dependent Claim
22 words
Photographic apparatus as defined in claim 8 wherein said resilient means is the driving connection between said shaft and said coupling means.
Claim 11
Dependent Claim
14 words
Photographic apparatus as defined in claim 9 wherein said coupling means include spring means.
Claim 12
Dependent Claim
35 words
Photographic apparatus as defined in claim 1 wherein said force transmitting means includes means for enabling said drive means to be moved beyond a position necessary to move said reflecting means into said second position.
Claim 13
Dependent Claim
30 words
Photographic apparatus as defined in claim 11 wherein said enabling means include spring means for preventing the excess movement of said drive means from being transmitted to said reflecting means.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |