Abstract: A mechanical coupling device includes a spring retainer wound up around two tie rods inside a housing, a driving device supported on a bearing plate above the spring retainer and having an axle extended out of the housing through a center hole. Inserting a rod member through an opening on the housing into openings on two side sections and an intermediate section of the spring retainer causes locating spring leaves on the spring retainer to be spread out to hold the rod member firmly fastened. Rotating the axle of the driving device in one direction causes the spring retainer to be contracted in moving back the locating spring leaves and releasing the rod member; rotating the axle of the driving device in the reversed direction causes the locating spring leaves to be spread out to hold the rod member being inserted firmly fastened.

Abstract: An elastic connector for holding mechanical parts firmly includes a base to accomodate an S-shaped spring piece and one unit of symmetrical steel sheets. On the upper direction of the base a supporting member is set to support the revolving of the control member, of which the two control rods are inserted into the S-shaped spring piece, while two fixing rods keep the steel sheets in a U-shaped condition. The upper direction of the control member is sealed by a lid which is fixed by a pair of rivets, only leaving a handle on the upper direction of the lid for operation purpose. When a spanner is sleeved onto the handle to revolve the control member, the two control rods of which will sandwich the two end plates of the S-shaped spring piece and drive them to move outward to enable the three holes to be arranged in a slanting formation, so as to produce a tightly squeezing function when passing through the outer wall of the rod member of the S-shaped spring piece, so as to hold the two firmly together.