Abstract: The present invention provides a modular electronic construction kit having modular control circuit boards or modules capable of achieving various types of electrical control for controlling movement of mechanical elements and the like. Each module includes cut-out plastic or metal templates to accommodate the introduction of a modular integrated electronic circuit board(s). A printed self-adhesive label is placed on the cut-out plastic or metal template. The printed labels represent the coded symbols for identification of the modular integrated circuit boards, including their functions and their electrical connections. In the preferred embodiment, the kit has a minimum of 6 different and numbered basic modules, but the kit may include up to 30 different modules which are intended for the optimization of complex control circuits. All of the modular circuit boards are electrically compatible with each other.

Abstract: An axially retained homokinetic joint comprises an element in the form of a tripod (20) connected to one (22) of two shafts to be coupled and a tulip element (42) connected to the other (34, 134) of the two shafts, the tripod element comprising three trunnions (26a) on which are rotatively and slidably mounted rollers (36a) received in three rolling tracks (40) formed in the tulip element, and are an axial retainer (44) for maintaining the two parts of the joint in position relative to each other. The axial retainer comprises an intermediate member (44) connected to the tulip element (42) and cooperating with the tripod element (20) by means of a connection enabling the latter to move in a plane at right angle to its axis (X--X). The rolling tracks (40) consist of tracks of substantially toroidal shape in which run rollers whose outer surface is spherical.