Bolt with integral locking member
AssigneeWestinghouse Electric Corp.
InventorsJohn C. Matarazzo, Ian L. W. Wilson, David E. Boyle, David H. Roarty, George E. Rudd
Life of this patent
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Abstract
A high strength bolt fastens a baffle plate and a former plate of a pressurized water nuclear reactor pressure vessel together. The bolt has a head portion and an integral locking member extending from the head portion for engaging one of the structural members to lock the bolt with the structural member. The integral locking member portion has a lower yield stress than the yield stress of the shank. A lower yield stress may be obtained by selective annealing. The locking member is less susceptible to stress corrosion cracking in high temperature, high pressure water of commercial nuclear power reactors.
Claims8
An alloyed bolt for fastening two structural members together comprising:
- a head portion;
- a threaded shank extending from the head portion;
- and an integral locking member extending from the head portion for engaging one of the two structural members to lock the bolt with the structural member, the alloy in the locking member portion having a lower yield stress than the yield stress of the alloy in the shank, wherein the bolt locking member has spaced apart first regions crimped outwardly of the bolt head and second regions crimped outwardly of the bolt head, the first crimped regions extending farther from the bolt head than do the second crimped regions.
A metallic bolt for fastening two structural members together comprising:
- a head portion;
- a threaded shank extending from the head portion;
- and an integral locking member extending from the head portion, the locking member portion having compressed second crimped regions and first regions crimped outwardly of the bolt head, the first crimped regions extending farther from the bolt head than do the compressed second crimped regions.
Dependencies are inferred from the claim text.