Patent US3811083A successfully refreshed from Google Patents.
US3811083A
Expired / Lapsed
US
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Automatic positioning device exhibiting high accuracy and repeatability
Assignee: United States Department of the Army
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Filing: 1973-04-09
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Granted: 1974-05-14
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Expires: 1993-04-09
Abstract
Abstract An automatic positioning mechanism for achieving extreme accuracy in dynamic repeatability based on the application of a constant torsion spring force. A member to be positioned is resiliently coupled to a drive means through a constant torsion spring. The drive means is disposed for displacing the member. The resilient coupling provides for cut-off of the drive means responsive to positioning of the member in the desired location.
Inventors
- 👤 P Minghella
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:50
CPC Classifications
G; G05; G05D; G05D3/00; G05D3/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
141 words
A device for accurately positioning an element comprising: a. mounting means for support of said element, said mounting means disposed for movement between first and second positions; b. stop means for limiting the movement of said mounting means; c. driving means for moving said mounting means between said first and second positions, said drive means including a gear motor and a shaft disposed for rotation by said gear motor; and, d. resiliently coupling means disposed for stopping said driving means responsive to engagement of said mounting means with said stop means, said resiliently coupling means including a spring retainer plate rigidly secured to said shaft, a cam rotatably carried on said shaft, and a torsion spring carried about said shaft intermediate said retainer plate and said cam, said torsion spring being disposed in biased relation with said retainer plate and cam.
Claim 2
Independent Claim
141 words
A device for accurately positioning an element comprising: a. mounting means for support of said element, said mounting means disposed for movement between first and second positions; b. stop means for limiting the movement of said mounting means; c. driving means for moving said mounting means between said first and second positions, said drive means including a gear motor and a shaft disposed for rotation by said gear motor; and, d. resiliently coupling means disposed for stopping said driving means responsive to engagement of said mounting means with said stop means, said resiliently coupling means including a spring retainer plate rigidly secured to said shaft, a cam rotatably carried on said shaft, and a torsion spring carried about said shaft intermediate said retainer plate and said cam, said torsion spring being disposed in biased relation with said retainer plate and cam.
Claim 3
Dependent Claim
89 words
A device as set forth in claim 1 wherein said spring retainer plate includes a groove to receive the first end of said torsion spring therein, and a pin extending therefrom; said cam including a groove to receive the second end of said torsion spring therein and an arcuate groove to receive said pin therein, whereby responsive to engagement of said mounting means with said stop means said shaft and said retainer plate is stopped from rotation while said torsion spring biases said cam for a predetermined rotational distance.
Claim 4
Dependent Claim
20 words
A device as set forth in claim 2 including means for stopping rotation of said cam at said predetermined distance.
Claim 5
Dependent Claim
20 words
A device as set forth in claim 3 wherein said means for stopping rotation of said cam is a micro-switch.
References Cited (Backward Citations)
US3431432A
Cited
US3736483A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-13 | 1977-11-12 | 1978-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-13 | 1981-11-12 | 1982-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-13 | 1985-11-12 | 1986-05-14 | $7700.00 | Window Closed / Lapsed |