Lock assembly for a control rod drive
This patent describes a lock assembly for selectively locking and unlocking a shaft for a control rod drive. It comprises a stationary housing surrounding the shaft; a gear fixedly joined to the shaft in the housing and having circumferentially spaced teeth; a key assembly including: a key support fixedly joined to the housing and having an elongate guide hole extending toward the gear teeth; a translatable key slidably disposed in the guide hole and having a locking tooth at a distal end thereof disposed adjacent to the gear; and a cam finger fixedly joined to the key and extending transversely outwardly therefrom; a cam roller disposed adjacent to the cam finger; and means for selectively moving the cam roller against the cam finger for translating the key in the guide hole for positioning the key and locking tooth in an engaged position in abutting contact with one of the gear teeth for preventing rotation of the gear and shaft in a first direction, and in a disengaged position spaced outwardly from the gear teeth for allowing unrestricted rotation of the gear and shaft in the first direction and in a second, opposite, direction.
- Assignee:
- General Electric Co., San Jose, CA (United States)
- Patent Number(s):
- US 5076994; A
- Application Number:
- PPN: US 7-664003
- OSTI ID:
- 5587751
- Resource Relation:
- Patent File Date: 4 Mar 1991
- Country of Publication:
- United States
- Language:
- English
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