Patent US3713374A successfully refreshed from Google Patents.
US3713374A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shutter for cameras
Assignee: Ricoh Co Ltd
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Filing: 1971-02-22
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Granted: 1973-01-30
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Expires: 1991-02-22
Abstract
Abstract A shutter blade drive lever having a projection is pivotally fixed to an integral flat portion bent at a right angle of a shutter release lever which rotates in parallel with a shutter blade having a projection for engagement with the projection of the drive lever. When the drive lever is moved to its energized position against its bias spring, the release lever is not permitted to rotate so that the projection of the drive lever may be kept out of contact of the projection of the shutter blade. When the shutter release lever is rotated so as to permit the drive lever to return to its initial position from the energized position, the projection of the drive lever moves along a path in which it strikes and swings past the projection of the shutter blade so as to rotate the shutter blade against its bias spring and then to return to its initial position, whereby the shutter is opened and closed. The shutter ensures the smooth and reliable operation and avoids the erratic operation.
Inventors
- 👤 Y Shiratory
- 👤 H Kaneko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:35
CPC Classifications
G; G03; G03B; G03B9/00; G03B9/08; G03B9/10; G03B9/58
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
212 words
A single-blade shutter for cameras comprising a. a single shutter blade provided with an integral arm, biased by a return spring and pivotally fixed to a shutter base plate perpendicular to the optical axis of a camera lens of a camera, b. a shutter release lever rotatable in a plane in parallel with the plane of rotation of said shutter blade and provided with a bent surface substantially perpendicular to said plane of rotation of said shutter release lever, and c. a shutter blade drive lever pivotally fixed to said bent surface of said shutter release lever, said shutter blade drive lever having an initial position and a bias spring urging the shutter blade drive lever toward said initial position, said shutter blade drive lever provided with an integral engaging portion for engagement with said arm of said shutter blade, said engaging portion of said shutter blade drive lever moving along a path in which said engaging portion does not engage with said arm when said shutter blade drive lever rotates against its bias spring, and said engaging portion engaging with said arm to thereby rotate said single shutter blade to open the shutter when said shutter blade drive lever returns to its initial position under the force of its bias spring.
Claim 2
Dependent Claim
212 words
A single-blade shutter for cameras comprising a. a single shutter blade provided with an integral arm, biased by a return spring and pivotally fixed to a shutter base plate perpendicular to the optical axis of a camera lens of a camera, b. a shutter release lever rotatable in a plane in parallel with the plane of rotation of said shutter blade and provided with a bent surface substantially perpendicular to said plane of rotation of said shutter release lever, and c. a shutter blade drive lever pivotally fixed to said bent surface of said shutter release lever, said shutter blade drive lever having an initial position and a bias spring urging the shutter blade drive lever toward said initial position, said shutter blade drive lever provided with an integral engaging portion for engagement with said arm of said shutter blade, said engaging portion of said shutter blade drive lever moving along a path in which said engaging portion does not engage with said arm when said shutter blade drive lever rotates against its bias spring, and said engaging portion engaging with said arm to thereby rotate said single shutter blade to open the shutter when said shutter blade drive lever returns to its initial position under the force of its bias spring.
Claim 3
Dependent Claim
212 words
A single-blade shutter for cameras comprising a. a single shutter blade provided with an integral arm, biased by a return spring and pivotally fixed to a shutter base plate perpendicular to the optical axis of a camera lens of a camera, b. a shutter release lever rotatable in a plane in parallel with the plane of rotation of said shutter blade and provided with a bent surface substantially perpendicular to said plane of rotation of said shutter release lever, and c. a shutter blade drive lever pivotally fixed to said bent surface of said shutter release lever, said shutter blade drive lever having an initial position and a bias spring urging the shutter blade drive lever toward said initial position, said shutter blade drive lever provided with an integral engaging portion for engagement with said arm of said shutter blade, said engaging portion of said shutter blade drive lever moving along a path in which said engaging portion does not engage with said arm when said shutter blade drive lever rotates against its bias spring, and said engaging portion engaging with said arm to thereby rotate said single shutter blade to open the shutter when said shutter blade drive lever returns to its initial position under the force of its bias spring.
Claim 4
Dependent Claim
212 words
A single-blade shutter for cameras comprising a. a single shutter blade provided with an integral arm, biased by a return spring and pivotally fixed to a shutter base plate perpendicular to the optical axis of a camera lens of a camera, b. a shutter release lever rotatable in a plane in parallel with the plane of rotation of said shutter blade and provided with a bent surface substantially perpendicular to said plane of rotation of said shutter release lever, and c. a shutter blade drive lever pivotally fixed to said bent surface of said shutter release lever, said shutter blade drive lever having an initial position and a bias spring urging the shutter blade drive lever toward said initial position, said shutter blade drive lever provided with an integral engaging portion for engagement with said arm of said shutter blade, said engaging portion of said shutter blade drive lever moving along a path in which said engaging portion does not engage with said arm when said shutter blade drive lever rotates against its bias spring, and said engaging portion engaging with said arm to thereby rotate said single shutter blade to open the shutter when said shutter blade drive lever returns to its initial position under the force of its bias spring.
Claim 5
Dependent Claim
76 words
A single blade shutter as in claim 1 including a control lever pivoted for rotation in a plane parallel to a plane of rotation of said shutter blade drive lever and having a first bent portion for engaging said shutter blade drive lever to hold the shutter blade drive lever in a cocked position at which said shutter blade drive lever is held against the urging of its bias spring and away from its initial position.
Claim 6
Dependent Claim
81 words
A single blade shutter as in claim 2 wherein the control lever is provided with a second bent portion, and wherein the shutter release lever is provided with a first projection, said first projection engaging the control lever second projection to rotate the control lever out of engagement with the shutter blade drive lever, whereby the bias spring of the shutter blade drive lever is allowed to return the shutter blade drive lever from its cocked position to its initial position.
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) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |