Abstract: A plug-in coupling for removably interconnecting a first structural member and a second structural member comprises a resiliently deformable female coupling part adapted to be inserted into a socket at the first structural member such that it is retained therein. The female coupling part comprises a ball-shaped cup, an intermediate annular wall integral with said ball-shaped cup and serving as a guide portion, and a tubular external wall integral with said annular intermediate wall. The external wall surrounds at least a part of the ball-shaped cup in spaced relation thereto and engages a peripheral wall of the socket when the female coupling part is inserted into the socket. A male coupling part comprises a ball-shaped head and a fixing portion for securing the male coupling part to the second structural member. The intermediate annular wall of the female coupling part is of an undulated shape at least in a certain area thereof.

Abstract: A joining assembly for joining a pair of structural members, comprises a bolt having a thread and a nut-like blind rivet adapted to be inserted into mounting holes of the structural members and to be threadingly engaged to each other. One of the mounting holes is made of resiliently deformable material and comprises a base member including a bore for receiving the thread of the bolt and having an outside provided with a plurality of threads which are similar in number to the corners of the polygonal mounting hole, such that when the bolt is threadingly engaged into the bore of the blind rivet the base member is folded whereby the threads have parts of their flanks pressed against one of the structural members.

Abstract: A fluid-tight, adjustable and self-locking threaded connection assembly comprising a nut and a bolt. The nut which is adapted to be fixed to a first structural member has a bore comprising a threaded portion and a smooth cylindrical portion. The bolt which is adapted to be removably connected to a second structural member has an intermediate portion provided with a plurality of circumferential sealing lips. The sealing lips are dimensioned with respect to said smooth cylindrical portion of the nut bore such that it is slidingly urged against said smooth portion of the nut bore when the bolt is adjusted relative to the nut. As a result thereof the threaded connection assembly is fluid-tight and self-locking while being adjustable.

Abstract: An adapter for removably holding a cellular phone on a belt clip to be secured to a belt. The adapter comprises a mounting portion adapted to be mounted to the cellular phone, a holding portion adapted to be received in a U-shaped seat of the belt clip, and a connecting portion between said mounting and holding portions. The connecting portion comprises a hinge means enabling pivotal movements of said holding portion relative to said mounting portion. Due to this structure inadvertent pivotal movements of the cellular phone relative to the belt clip secured to the belt do not result in the adapter being broken off of the cellular phone causing damages to or even destruction of the cellular phone.

Abstract: A plug-in coupling having vibration damping characteristics. An elastomeric insert member comprising a ball-shaped female part is inserted into a socket integral with a member so as to be positively retained therein. The plug-in coupling can be easily assembled and disassembled.