Device for measuring the extension of a threaded bolt or screw

摘要

PCT No. PCT/EP96/02901 Sec. 371 Date Jan. 8, 1998 Sec. 102(e) Date Jan. 8, 1998 PCT Filed Jul. 8, 1995 PCT Pub. No. WO97/03296 PCT Pub. Date Jan. 30, 1997A measuring device for measuring the extension of a threaded bolt or a screw tightened by a nut has an extension measuring scale provided at a circumference of either the nut, of a screw head of the screw, or of a tightening element rotatable relative to the nut or the screw head of the screw. Reference marks for the measuring scale are arranged stationary relative to the extension measuring scale.