Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Externally threaded fastener element – e.g. – bolt – screw – etc. – Multipart
Patent
1987-09-25
1989-12-05
Smith, Gary L.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Externally threaded fastener element, e.g., bolt, screw, etc.
Multipart
411384, 411395, 411914, 411916, 29405, 29446, 295251, 277125, 277165, 277190, F16B 3502
Patent
active
048849340
ABSTRACT:
A junction bolt for joining members by use of clamping nuts engaged with the junction bolt is provided with an axial inner hollow hole in which a piston member is located so as to define a space between the outer peripheral surface of the piston member and the inner wall of the junction bolt. The space is divided by a sealing member into a pressurizing space into which a pressurized fluid is introduced and a temperature adjusting space into which a heat medium is introduced. In the bolt clamping force adjusting method, the temperature of the junction bolt is first adjusted to a predetermined temperature and an extending amount of the junction bolt to be caused when an aimed clamping force is applied at this predetermined temperature. The pressurized fluid having a pressure corresponding to one required for causing the calculated extending amount is introduced into the pressurizing space to thereby extend the junction bolt body, and under the extended condition, the bolt is clamped by the clamping nuts till the nuts closely contact to the members to be joined. Finally, the pressurized fluid is discharged to contract the junction bolt so as to set the clamping force to a predetermined value.
REFERENCES:
patent: 546314 (1895-09-01), Farrey
patent: 2190419 (1940-02-01), Evarts
patent: 2320398 (1943-06-01), Zetterquist
patent: 2934968 (1960-05-01), Neumann et al.
patent: 3130628 (1964-04-01), Blinn
patent: 3209640 (1965-10-01), Waivers
patent: 3835523 (1974-09-01), Stansfield
patent: 3947948 (1976-04-01), Fredricksson et al.
patent: 4192519 (1980-03-01), Buggele
patent: 4637640 (1987-01-01), Fournier et al.
patent: 4718282 (1988-01-01), Bonfils
"Steam turbine-maintenance to upgrade performance" by H. G. A. Werner, ASEA. Stahl, Sweden, May 1986.
Catalogue of Hydra-Tight Limited Company Company.
Ikeda Takashi
Tsunoda Euji
Kabushiki Kaisha Toshiba
Ringel Douglas E.
Smith Gary L.
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