Abstract: A fastening device of synthetic resin comprises a male member provided on its shaft portion with screw threads and a female member having at least one pitch of spiral thread on the inside surface of the bore thereof. A plurality of apertured panels are positively fastened face to face by inserting the leg of the female member into apertures of the panels and subsequently, forcing the shaft portion of the male member into the bore of the female member. The panels thus fastened can be separated by rotating the male member so as to threadably extract the male member from the female member.

Abstract: A fastening means for a rearview mirror in an automobile interior, which comprises a fastening base formed on the supporting arm of the rearview mirror and a fitting member for securing the fastening base on the automobile body by using a setscrew. The fitting member is provided with a flange-shaped engaging portion having thin-walled portions which is readily broken under an impact which is caused by colliding a human body into the rearview mirror in case of an accidental sudden deceleration of the automobile for example, thereby to permit the mirror to fall off the automobile body.

Abstract: A fastener for detachably fastening first and second workpieces together is disclosed. The first workpiece has a through aperture of predetermined shape. The second workpiece has a through aperture of predetermined shape which includes a first small diameter portion having first opposed edges spaced apart a first predetermined distance and a second annularly displaced portion having second opposed edges spaced apart a second, relatively larger predetermined distance. The fastener comprises a base, a first catch portion integral with and extending outwardly from a first side of the base, a second catch portion integral with and extending outwardly from the base oppositely from the first catch portion, and a twistable stem integral with the base for enabling at least one of the first and second catch portions to be twisted for angularly spacing such catch portion for disengagement of the fastener from the aperture of at least one of the first and second workpieces with which such catch portion is engaged.

Abstract: A fastening device of synthetic resin includes a male member and a female member. The device is capable of fastening objects by simply axially forcing the male member into the female member whereby external threads of the male member threadably engage with internal threads of the female member. In order to unfasten the device, the male member is rotated in an appropriate direction whereby the male member threadably disengages with the female member causing the male member to axially disengage with the female member.

Abstract: A bundling fastener for bars or wires comprises a bundling member and a fastener member serving to attach the bundling member to a support. Owing to the use of a press-on and split-off type fastener as the bundling member, the bundling fastener provides perfect bundling of bars or wires even when the total bundle diameter or the number of bars or wires is varied.

Abstract: Disclosed is a retaining device for cords, which comprises a pair of retainer blocks formed integrally through the medium of a thin-walled hinge piece, one of said pair of retainer blocks being provided with a plurality of paths for interchangeably admitting cords of differing cross sections and the remaining retainer block being provided with push pieces adapted to push down the cord laid through a selected one of said paths, whereby cords of differing cross section can be retained in proper posture by being received in a path of conforming contour and the pair of retainer pieces being folded over each other across said thin-walled hinge piece.