Patent US1788665A successfully refreshed from Google Patents.
US3855873A
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Geneva mechanism
Assignee: National Aeronautics and Space Administration
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Filing: 1973-11-02
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Granted: 1974-12-24
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Expires: 1993-11-02
Abstract
Abstract An improved Geneva mechanism characterized by a driven starwheel having a segmented cam-follower surface and a star-wheel driver including a restraining cam having a segmented cam surface for engaging the cam-follower surface of the star-wheel and antifriction rollers pinned to the restraining cam for engaging the cam-follower surface of the star-wheel.
Inventors
- 👤 R Kenney
- 👤 J Fletcher
- 👤 R Summers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:59
CPC Classifications
F; F16; F16H; F16H27/00; F16H27/04; F16H27/06; Y; Y10; Y10T; Y10T74/00; Y10T74/14; Y10T74/1418; Y10T74/1424; Y10T74/1441; Y10T74/19; Y10T74/1987; Y10T74/19879
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
119 words
In a Geneva mechanism characterized by a star-wheel having a plurality of uniformly disposed, radially extended drive slots and a segmented cam-follower surface including a plurality of uniform, incurvated segments interposed between the drive slots, and a star-wheel driver comprising a driving arm and a juxtaposed restraining cam having a segmented cam surface contiguously related with the segmented cam-follower surface and including an excurvated segment having a radius of curvature substantially equal to the radius of the incurvated segments of said camfollower surface for sequentially engaging segments of the camfollower surface, the improvement comprising: friction reduction means interposed between the cam surface and the cam-follower surface adjacent to each end portion of said excurvated segment of the cam surface.
Claim 2
Dependent Claim
119 words
In a Geneva mechanism characterized by a star-wheel having a plurality of uniformly disposed, radially extended drive slots and a segmented cam-follower surface including a plurality of uniform, incurvated segments interposed between the drive slots, and a star-wheel driver comprising a driving arm and a juxtaposed restraining cam having a segmented cam surface contiguously related with the segmented cam-follower surface and including an excurvated segment having a radius of curvature substantially equal to the radius of the incurvated segments of said camfollower surface for sequentially engaging segments of the camfollower surface, the improvement comprising: friction reduction means interposed between the cam surface and the cam-follower surface adjacent to each end portion of said excurvated segment of the cam surface.
Claim 3
Dependent Claim
29 words
The improvement of claim 1 wherein said friction reduction means includes a pair of anti-friction rollers pinned to said restraining cam for engaging the segments of said cam-follower surface.
Claim 4
Dependent Claim
21 words
The improvement of claim 2 wherein said star-wheel is further characterized by being biased in the direction of said angular displacement.
Claim 5
Dependent Claim
164 words
A Geneva mechanism comprising: a. a star-wheel having a plurality of radially extended drive slots and a segmented cam follower surface including uniformly incurvated segments; b. a star-wheel driver for imparting incremental angular displacement to the star-wheel having a driving arm affixed to a drive shaft, a stub shaft disposed at the distal end of the driving arm for sequential insertion into the drive slots of said star-wheel, and a restraining cam having a segmented cam surface disposed in juxtaposition with the star-wheel, including an excurvated segment having a radius of curvature substantially equal to the radius of curvature of the incurvated segments, and an incurvated segment extended between the opposite ends of said excurvated segment having a radius of curvature greater than the greatest radius for said star-wheel; and c. friction reduction means including an anti-friction roller pinned to said restraining cam near each of the opposite ends of said excurvated cam surface for engaging the incurvated segments of said cam follower surface.
Claim 6
Dependent Claim
164 words
A Geneva mechanism comprising: a. a star-wheel having a plurality of radially extended drive slots and a segmented cam follower surface including uniformly incurvated segments; b. a star-wheel driver for imparting incremental angular displacement to the star-wheel having a driving arm affixed to a drive shaft, a stub shaft disposed at the distal end of the driving arm for sequential insertion into the drive slots of said star-wheel, and a restraining cam having a segmented cam surface disposed in juxtaposition with the star-wheel, including an excurvated segment having a radius of curvature substantially equal to the radius of curvature of the incurvated segments, and an incurvated segment extended between the opposite ends of said excurvated segment having a radius of curvature greater than the greatest radius for said star-wheel; and c. friction reduction means including an anti-friction roller pinned to said restraining cam near each of the opposite ends of said excurvated cam surface for engaging the incurvated segments of said cam follower surface.
References Cited (Backward Citations)
US2789441A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |