Strain gauge holder

A strain gauge holder comprising:

• a holder body configured to be mounted on a side surface of a cylindrical object-to-be-measured;
• one or more gauge pressing members for pressing strain gauges against the side surface of the object-to-be-measured;
• and
• one or more feed mechanisms for giving a pressing forces to the gauge pressing members, wherein
• the holder body includes two or more bracket members, each of the bracket members includes a mating surface for forming an opening in which the object-to-be-measured is to be positioned, all of the bracket members of which mating surfaces are mated with each other are coupled to each other through fastening members to form the opening, the object-to-be-measured is to be positioned in the opening, the holder body is to be mounted on the object-to-be-measured,
• at least one of the bracket members includes one or more guide grooves for guiding the gauge pressing member, and
• the feed mechanism includes a threaded hole provided in a back surface of the gauge pressing member which is restrained from freely rotating in the guide groove, a bushing having a flange and inserted into a through hole formed in the bracket member, and a feed screw threadedly inserted into the bushing,
• the feed screw threadedly inserted into the bushing is threadedly inserted into the threaded hole formed in the back surface of the gauge pressing member to feed the gauge pressing member in the guide groove, and the strain gauge is pressed against the side surface of the object-to-be-measured.