Metal working – Method of mechanical manufacture – With testing or indicating
Patent
1980-01-18
1982-06-08
Husar, Francis S.
Metal working
Method of mechanical manufacture
With testing or indicating
29240, 7386224, 81467, 364508, 411 10, B23Q 1700, B23P 1904
Patent
active
043332200
ABSTRACT:
A method and apparatus for tightening an assembly including a pre-load indicating fastener is disclosed. Pre-load indicating fasteners are generally tightened until a crushable element, forming a portion of the pre-load indicating fastener, is plastically deformed. The present invention permits such fasteners to be tightened until the crushable element of the fastener is completely deformed. This reduces the problem of relaxation generally associated with such fasteners. The present invention permits joints including such fasteners to be tightened by automatic tightening systems, if so desired. The assembly is tightened until the crushable element of the fastener is fully plastically deformed and elastic deformation of the joint has commenced. Sensing means are provided in the automatic tightening system to enable detection of this point and to automatically stop the tightening system when this point is reached.
REFERENCES:
patent: 3192481 (1965-06-01), Pincus
patent: 3323403 (1967-06-01), Waisman
patent: 3585401 (1971-06-01), Karl
patent: 3867865 (1975-02-01), Dahl
patent: 3982419 (1976-09-01), Boys
patent: 4041288 (1977-08-01), Conway et al.
Arbes Carl J.
Husar Francis S.
Nerenberg Aaron
SPS Technologies, Inc.
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