US3762994A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drive assembly for nuclear reactor control rods
Assignee: Siemens AG
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Filing: 1970-12-09
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Granted: 1973-10-02
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Expires: 1990-12-09
Abstract
Abstract A drive assembly for inserting and removing the control rod of a nuclear reactor has a guide tube arranged outside the reactor and a drive rod connectable to the control rod. The drive rod is movable within the tube between raised and lowered positions and a holding device is provided for holding the drive rod in a raised position. A spring surrounding the drive rod is compressed when the lifting device holds the drive rod in the raised position. The shock absorber disposed at the lower region of the guide tube receives the impact of the spring when the drive rod is released by the holding device.
Inventors
- 👤 H Kunzel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:41
CPC Classifications
G; G21; G21C; G21C7/00; G21C7/06; G21C7/08; G21C7/20; G21C7/12; Y; Y02; Y02E; Y02E30/00; Y02E30/30
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
26 words
Apparatus according to claim 1 wherein the longitudinal length of said spring means in uncompressed condition is less than the maximum stroke of said drive rod.
Claim 2
Dependent Claim
66 words
Apparatus according to claim 1 comprising stop means on said guide tube limiting the raised position of said spring compression means, said spring compression means having an upper portion engageable by said spring means such that when said drive rod is in its raised position, said spring means urges said spring compression means against said stop means and biases said drive rod toward a lower direction.
Claim 3
Dependent Claim
61 words
Apparatus according to claim 3 comprising a second stop means for said spring means disposed in a lower portion of said guide tube, said spring means being compressed between said second stop means and said upper engageable portion on said spring compression means to absorb the impact of said drive rod and control rod as the latter approach their lower position.
Claim 4
Dependent Claim
30 words
Apparatus according to claim 4 wherein said second stop means comprises a second spring means which is substantially less compressible per unit force applied through said first mentioned spring means.
Claim 5
Dependent Claim
31 words
Apparatus according to claim 4 wherein said spring compression means has a lower end portion which engages said second stop means to determine the lower position of said spring compression means.
Claim 6
Dependent Claim
61 words
Apparatus according to claim 1 wherein said spring compression means is a tube element in which said spring means is disposed, the longitudinal length of said tube element being at least approximately equal to the longitudinal length of said spring means, under the condition when said spring means is subjected to carrying the load of said control rod and drive rod.
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) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |