Tools – Wrench – screwdriver – or driver therefor – Responsive to torque on work
Patent
1994-01-24
1995-05-16
Meislin, D. S.
Tools
Wrench, screwdriver, or driver therefor
Responsive to torque on work
811242, B25B 2314
Patent
active
054150655
ABSTRACT:
A hand tool formed by a body member 10B and a torque sleeve member 12S is employed to tighten a connector nut 14N at the end of an electrical cable 14C onto a cable terminal post 14P. The body is elongated having a long axis with a socket wrench 10W at one end and a handle 10H at the other end. A cable channel 10C extends along the long axis from the wrench end to the handle end for receiving the cable during installation. The inside surface of the wrench has side walls 10SW for capturing the connector nut. The outside surface of the wrench has a slight taper toward the wrench end of the body, and the inside surface of the sleeve has a generally matching taper. The sleeve is slide mounted over the wrench and the connector nut for establishing a pre-load hoop tension in the sleeve against the wrench which establishes a pre-load compression in the wrench against the connector nut. The engagement of the matching tapered surfaces causes the pre-load hoop tension to increase as the sleeve is slid over the wrench. The tapered surface engagement produces a working load hoop tension in the sleeve as the nut is tightened against the terminal post, which produces a working load compression in the wrench against the nut. The working load hoop tension has a critical value above which the tensile expansion of the sleeve permits the side walls of the wrench to slip around the nut for limiting the torque of the nut against the terminal post.
REFERENCES:
patent: 4724731 (1988-02-01), Onofrio
patent: 4880245 (1989-11-01), Autrey
patent: 5165310 (1992-11-01), Heinrich
Hentzel Paul
Meislin D. S.
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