Tool for pre-tensioning a fastener

Details Tool for pre-tensioning a fastener Tool for pre-tensioning a fastener

1979-05-10

1981-01-27

Jones, Jr., James L.

Tools

Wrench, screwdriver, or driver therefor

Machine

B25B 2902

Patent

active

042468108

ABSTRACT:
PCT No. PCT/US79/00312 Sec. 371 Date May 10, 1979 Sec. 102(e) Date May 10, 1979, PCT Filed May 10, 1979.
Bolts (11) are used to assemble a cylinder head and an engine block. The bolts (11) must be torqued to a preload tension. The tension often decays or relaxes after a time, thus reducing the firm fastening which is desired. A fastening tool (10,10a) of this invention provides for the efficient and closely controlled imposition of a predetermined tension on a stud (13) while simultaneously applying a torque to a nut (15) to rotate and tighten it to maintain such tension. The fastening tool (10,10a) comprises a housing (18,18a) having a fluid-actuated piston (24,24a) reciprocally mounted therein. The piston (24,24a) is adapted for threaded attachment with the stud (13) to imposed a predetermined tension thereon.

REFERENCES:
patent: 4020720 (1977-05-01), Fujii
patent: 4104934 (1978-08-01), Raschke et al.

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