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Torque Nut and Torque Socket Using Check Nut With Preset Frictional Grip on Left-Hand Threaded Shaft

IP.com Disclosure Number: IPCOM000047709D
Original Publication Date: 1983-Dec-01
Included in the Prior Art Database: 2005-Feb-08
Document File: 2 page(s) / 27K

Publishing Venue

IBM

Related People

Bahri, K: AUTHOR [+2]

Abstract

A nut that is to be tightened on a screw to a preset torque has a hex-shaped nut-like portion and a hollow shaft that is coaxial with the nut-shaped portion and extends along the axis of the threads of the nut. The nut portion, and optionally, the shaft have internal righthand threads that mate conventionally with a screw. Along the outside of the hollow shaft portion, the nut has external left-hand threads that receive a check nut that has left hand internal threads. The check nut is initially screwed onto the hollow shaft and is tightened to grip the shaft up to a precisely predefined torque. Thus, turning the check nut to the right turns the torque nut on the screw up to the torque at which the check nut breaks free. The nut hex portion of the torque nut permits the connection to be unscrewed.

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Torque Nut and Torque Socket Using Check Nut With Preset Frictional Grip on Left-Hand Threaded Shaft

A nut that is to be tightened on a screw to a preset torque has a hex-shaped nut-like portion and a hollow shaft that is coaxial with the nut-shaped portion and extends along the axis of the threads of the nut. The nut portion, and optionally, the shaft have internal righthand threads that mate conventionally with a screw. Along the outside of the hollow shaft portion, the nut has external left-hand threads that receive a check nut that has left hand internal threads. The check nut is initially screwed onto the hollow shaft and is tightened to grip the shaft up to a precisely predefined torque. Thus, turning the check nut to the right turns the torque nut on the screw up to the torque at which the check nut breaks free.

The nut hex portion of the torque nut permits the connection to be unscrewed. In a related structure, the torque nut is replaced by a socket. The socket is adapted to be turned by a ratchet handle or by a non ratcheting wrench. The check nut transmits torque to the socket only up to a preset torque. After the check nut breaks free, it can be retightened onto the shaft of the socket to a preset torque and the device is ready for use in another application. Fig. 1 shows the base nut 2 and check nut 3 of the torque nut assembly, and Fig. 2 shows the base socket 4 and check nut 5 of the torque socket assembly.

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