Abstract: An object of the present invention is to provide a fastener made compact on the whole and capable of producing a strong fastening strength. To attain the object according to the invention, there is provided a fastener for being fitted to a fastening member (B) while continually exerting a tightening torque to the fastening member (B) fixedly screwed onto a mounting base, comprising a torsion coil spring formed in a winding shape so as to be inserted in an axial direction of the fastening member (B) into the fastening member (B) and having a fixing end (13) to be fixed onto the mounting base (A), and a detachable stopper (2) for restraining the torsion coil spring (1) in a state of accumulating a tightening torque.

Abstract: An object of the present invention is to provide a fastener made compact on the whole and capable of producing a strong fastening strength. To attain the object according to the invention, there is provided a fastener for being fitted to a fastening member (B) while continually exerting a tightening torque to the fastening member (B) fixedly screwed onto a mounting base, comprising a torsion coil spring formed in a winding shape so as to be inserted in an axial direction of the fastening member (B) into the fastening member (B) and having a fixing end (13) to be fixed onto the mounting base (A), and a detachable stopper (2) for restraining the torsion coil spring (1) in a state of accumulating a tightening torque.

Abstract: A tightening device includes an energizing member for energizing a tightening member to be secured to a tightening object. The energizing member integrally has at its one end an engaging part to be engaged with the tightening member. A switching member is connected to the tightening member for switching over to the constraining or operating state of the energizing force imparted to the tightening member by the energizing member. The switching member initially tightly holds the engaging part of the energizing member and the other end portion thereof to constrain the energizing force and is then separated from the engaging part and the other end portion of the energizing member to activate the energizing force.

Abstract: An automatic screw clamping device for automatically tightening bolts fitted in a metallic mount member, which is hard to nail includes a casing (2), a rotator (4) disposed in the casing (2) in a manner that the rotator may rotate and move up and down, a biasing member (5) connected with the rotator (4) and the casing (2), and a covering member for covering over the casing (2). Fitments are provided on the lower end of the casing (2). The rotator (4) includes an inner periphery having an engaging portion (41) that can unrotatably mesh with the clamped member (n), and includes an outer periphery with a locking portion (42) which is unrotatably lockable to the casing (2). The rotator (4) locked to the casing (2) is engaged with the clamped member (n) to press the casing (2) downward.