Nut temporary tightening device

A nut temporary tightening device comprising:

• bearing parts each having a cylindrical sleeve extending in an up-down direction and a flange provided at an intermediate portion of the cylindrical sleeve;
• a first support plate having a plurality of first support holes that each support corresponding one of the bearing parts along an outer circumference, on an upper end side, of the bearing part;
• a second support plate that is fixed under the first support plate at a distance greater than a thickness of the flange such that the second support plate faces and is parallel to the first support plate, and has a plurality of second support holes that each support corresponding one of the bearing parts along the outer circumference, on a lower end side, of the bearing part;
• and
• socket assemblies each having a driving shaft that is passed through corresponding one of the bearing parts that is supported such that the flange is loosely fitted in the up-down direction between the first support plate and the second support plate, a driving gear that is provided at a portion of the driving shaft protruding toward the upper end side, and a socket that is provided to be able to hold a nut at a leading end of the driving shaft protruding toward the lower end side, wherein
• the first support holes of the first support plate are disposed in a linear arrangement,
• the second support holes of the second support plate are disposed in a linear arrangement at positions corresponding to the first support holes,
• the first support plate has elongated holes as the first support holes, and a long-side direction of each of the elongated holes extends along a direction in which the first support holes are disposed,
• the second support plate has elongated holes corresponding to the first support holes as the second support holes, and
• at least one pair of corresponding holes of the first support holes and the second support holes of the first support plate and the second support plate is reference holes, and a diameter of the reference holes is set to be smaller than a diameter of the other first support holes or a diameter of the other second support holes.