The improved lathe chuck wrench (see figure) is composed of a handle 1, a bush 2, a spring 3, a sleeve 4 and a body 5. The sleeve 4 and the wrench body 5 are in a clearance fit, and the sleeve 2 and the sleeve 4 are in an interference fit and are in clearance fit with the wrench body 5. The purpose of the bushing is to prevent the sleeve from falling out. Usually, the square head on the wrench body is made by the spring force.
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