Patent ID: 9587665
Date: 2017-03-07
CPC Classifications: F16B

Claim:
1. A screw fastener, comprising: a first member provided with a tool engaging feature for engaging a turning tool on an axial end, a central receiving bore opening out at an opposite axial end and an annular end surface surrounding an open end of the central receiving bore; a tubular second member rotatably received in the central receiving bore, and having a fitting shaft portion at an axial end thereof formed with a circumferential groove on an outer circumference thereof and a male thread formed in an opposite axial end thereof, the opposite axial end of the second member being further provided with a fastening thread thereon, a disk supporting shaft portion being formed on the second member between the fitting shaft portion and the male thread; a retaining member partly received in the circumferential groove on the outer circumference of the fitting shaft portion and engaged by the first member; a rod member fixed to the first member and extending axially toward the second member; a plurality of drive disk members fitted on the outer circumferential surface of the disk supporting shaft portion in an axially slidable and rotatable manner and having a through hole for axially passing the rod member therethrough; a plurality of driven disk members fitted on the outer circumferential surface of the disk supporting shaft portion in an axially slidable and rotationally fast manner so as to axially alternate with the drive disk members; a spring member disposed on the outer circumferential surface of the disk supporting shaft portion to urge the drive disk members and the driven disk members toward the annular end surface of the first member; and a spring retainer threadably engaged by the male thread of the second member to apply a preload to the spring member.