Patent ID: 6880433

Claim:
A tightening force imparting device comprising an energizing member for energizing a tightening member to be secured to a tightening object in a tightening direction, said energizing member being provided integrally at a first end portion with an engaging part to be engaged with the tightening member, and a switching member to be connected to the tightening member for switching over to one of the constraining and operating states of the energizing force imparted to the tightening member by the energizing member, characterized by the switching member comprising a support part having an inner support engaged with said engaging part of said energizing member and outer supports in contact with the outer peripheral surface of said energizing member so as to constrain the energizing force, and a casing containing said energizing member with a second end portion caught by said casing, said casing having a sliding hole for allowing said switching member to be pushed up by said tightening member to allow separation of said switching member from said engaging part of said energizing member.