Patent US3779134A successfully refreshed from Google Patents.
US3779134A
Expired / Lapsed
US
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Nuclear reactor control rod drives
Assignee: Licentia Patent Verwaltungs GmbH
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Filing: 1971-06-07
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Granted: 1973-12-18
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Expires: 1991-06-07
Abstract
Abstract A control rod drive for nuclear reactors in which the drive is actuated through a pressure medium that acts against a control piston associated with the rod and having a locking device which includes relatively movable latches that can be selectively engaged in detents in a guide tube for the piston. A second control piston is carried in axially spaced relationship to the control piston within the guide tube and has the same type of locking device. Means are provided within the guide tube to operatively interconnect the locking devices of the two control pistons in a sequential manner and to ensure that, during a movement of the drive in a direction to withdraw the control rod from the reactor, the latches of one locking device are engaged in an associated detent during a movement of the control piston crrrying the other locking device and this locking device is not disengaged until the latches of the other locking device are engaged in another detent.
Inventors
- 👤 P Daublebsky
- 👤 G Zeitzschel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:25
CPC Classifications
G; G21; G21C; G21C7/00; G21C7/06; G21C7/08; G21C7/12; G21C7/16; Y; Y02; Y02E; Y02E30/00; Y02E30/30
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
185 words
In a control rod drive for nuclear reactors which is actuated by a pressure medium and in which the control rod is actuated by a first control piston axially movable within a guide tube, and having locking devices with relatively first movable latch members engageable with detent means on the tube, the improvement comprising, in combination; a. a second control piston also axially movable within the guide tube and having locking devices which include relatively second movable latch members which are also engageable with the detent means; b. first latch control means cooperating with the first control piston and said second movable latch members for retracting said second latch members when the first piston is in a first position relative to said second piston; c. second latch control means cooperating with said second control piston and the first movable latch members for retracting the first latch members when said first piston is in a second position relative to said second piston; d. whereby, at any given time, one of said first and second movable latch members is in engagement with detent means on the tube.
Claim 2
Dependent Claim
185 words
In a control rod drive for nuclear reactors which is actuated by a pressure medium and in which the control rod is actuated by a first control piston axially movable within a guide tube, and having locking devices with relatively first movable latch members engageable with detent means on the tube, the improvement comprising, in combination; a. a second control piston also axially movable within the guide tube and having locking devices which include relatively second movable latch members which are also engageable with the detent means; b. first latch control means cooperating with the first control piston and said second movable latch members for retracting said second latch members when the first piston is in a first position relative to said second piston; c. second latch control means cooperating with said second control piston and the first movable latch members for retracting the first latch members when said first piston is in a second position relative to said second piston; d. whereby, at any given time, one of said first and second movable latch members is in engagement with detent means on the tube.
Claim 3
Dependent Claim
95 words
An arrangement as defined in claim 1, wherein said first latch control means includes a first set of dependent fingers on the first control piston which are axially aligned with spaced openings in said second latch members of said locking devices on said second control piston, said second latch members being movable in a direction transverse to the axis of the tube whereby during movement of the first control piston toward said second control piston said fingers enter the spaced openings in said second latch members to retract said latch members from associated detent means.
Claim 4
Dependent Claim
111 words
An arrangement as defined in claim 2, wherein said second latch control means includes a member connected to said second control piston, said member extending through the first control piston and terminating beyond the first control piston in an end attachment having a second set of dependent fingers projecting toward openings in the first latch members on the first control piston whereby during movement of said second control piston in a direction away from the first control piston said second set of dependent fingers engages with the first latch members on the first control piston to retract the first latch members from the detent means in which they are engaged axially.
Claim 5
Dependent Claim
73 words
An arrangement as defined in claim 1, wherein said first and second latch control means include eccentric means on thE control rod and receivable within openings in the latch members of the first control piston and said second control piston, the openings being defined by wall portions on the latch members of the locking devices that are movable relative to each other in a direction transverse to the axis of the guide tube.
Claim 6
Dependent Claim
49 words
An arrangement as defined in claim 4, wherein said means further includes an actuating piston axially movable within said second control piston and operatively connected to the control rod, and control means for causing the control rod to rotate as it moves axially relative to said second control piston.
Claim 7
Dependent Claim
66 words
An arrangement as defined in claim 5, wherein said control means includes a slidable piston which is axially displaceable along the control rod, roller means carried by said slidable piston and engageable with thread means on said second control piston, said slidable piston having follower means connecting said piston to the control rod, whereby rotary movement of said slidable piston is imparted to the control rod.
Claim 8
Dependent Claim
30 words
An arrangement as defined in claim 4, further comprising a control slide valve connected to one end of the control rod to be axially movable within said second control piston.
Claim 9
Dependent Claim
108 words
An arrangement as defined in claim 7, wherein said control slide valve has a circular groove at one end thereof, the spaced side wall portions of the groove diverging outward from the bottom of the groove and further comprising a plurality of sets of oppositely disposed balls urged against spaced portions of said control slide valve at the location of the groove by resilient means carried in said second control piston, one set of balls being axially spaced relative to another set whereby said one set of balls coacts against one side wall portion of the groove while the other said set coacts against said control slide valve.
Claim 10
Dependent Claim
86 words
An arrangement as defined in claim 7, wherein the control rod is connected to said control slide valve by means of a collar slidable in said control slide valve through an axial distance which is less than the distance said slidable piston can move axially in said second control piston, whereby said collar contacts spaced portions of said control pusher before said slidable piston reaches its end positions within said second control piston and said control slide valve is axially moved within said second control piston.
Claim 11
Dependent Claim
33 words
An arrangement as defined in claim 1, wherein each locking device includes latch members which are offset at the center portion of the locking device and are slidable with respect to each other.
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) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |