US3639072A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for limiting the movements of the wicket gates in a water turbine
Assignee: NOHAB AB
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Filing: 1970-01-13
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Granted: 1972-02-01
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Expires: 1990-01-13
Abstract
Abstract The turbine wicket gate regulator ring is connected to a crank secured to each wicket gate stem and comprising an inner portion securely connected with the crank hub and an outer portion which is connected with the inner portion by means of a shear pin. A crank extension extends from the inner crank arm portion with a length which is such that the adjacent crank hub and a portion of the regulator ring projects into the range of oscillation of the extension to act as a barrier against movement thereof and by contact to restrict the angle of oscillation.
Inventors
- 👤 Nils Eric Munkstrand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:45
CPC Classifications
F; F03; F03B; F03B3/00; F03B3/16; F03B3/18; F03B3/183; Y; Y02; Y02E; Y02E10/00; Y02E10/20
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
135 words
An arrangement for restriction of movement of the wicket gates in a water turbine, pump turbine or the like having a wicket gate regulator mechanism, the arrangement comprising a regulator ring capable of being rotated by servomotors, a crank secured to each wicket gate stem and a link connecting the regulator ring and the crank, the crank arm comprising an inner portion which is connected with the inner portion by means of a shear pin, characterized by a crank extension (22) which is connected to the crank hub (16) and the length of which is such that said crank hub (16) and a portion of the regulator ring (12) project into the range of oscillation of said extension to act as a barrier against movement thereof and by contact to restrict the angle of oscillation.
Claim 2
Dependent Claim
135 words
An arrangement for restriction of movement of the wicket gates in a water turbine, pump turbine or the like having a wicket gate regulator mechanism, the arrangement comprising a regulator ring capable of being rotated by servomotors, a crank secured to each wicket gate stem and a link connecting the regulator ring and the crank, the crank arm comprising an inner portion which is connected with the inner portion by means of a shear pin, characterized by a crank extension (22) which is connected to the crank hub (16) and the length of which is such that said crank hub (16) and a portion of the regulator ring (12) project into the range of oscillation of said extension to act as a barrier against movement thereof and by contact to restrict the angle of oscillation.
Claim 3
Dependent Claim
64 words
An arrangement as claimed in claim 1, characterized in that the free end of the crank extension (22) forms an angular member (24) which extends in the oscillating plane of the crank extension substantially at right angles to the abutment surfaces on the movement restricting barriers (12,16) and which has a length which determines the maximum path of movement of the wicket gates (7).
Claim 4
Dependent Claim
33 words
An arrangement as claimed in claim 2, characterized in that the portion of the regulator ring (12) which forms the movement restRiction barrier is formed by the web (23) of the ring (12).
Claim 5
Dependent Claim
24 words
The arrangement as claimed in claim 2, characterized in that the abutment surfaces (25) on the angular member (24) are provided with shock-absorbing material.
Claim 6
Dependent Claim
35 words
An arrangement as claimed in claim 1, characterized in that the free end of the crank extension (22) is adapted to cooperate with a wicket gate movement lock (26) arranged on the regulator ring (12).
Claim 7
Dependent Claim
40 words
An arrangement as claimed in claim 5, characterized in that the lock (26) includes a hydraulically operated piston (29) which is adapted to urge the end of the crank extension (22) against an anvil (27) on the regulator ring (12).
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |