Abstract: A runner assembly consists of a hollow support providing a track, and a chain link belt revolving in the track, the hollow support consisting of a pair of frame members contoured in mirror symmetry, and which are joined together to provide flanges facing towards each other. The chain link belt is thus guided, and is at least partially encapsulated and protected against contaminants.

Abstract: A multi-part actuating mechanism formed of at least two correlated individual actuating elements contained within a housing. The actuating elements being arranged to move relative to each other and each being equipped with differently poled magnetic fields so that the fields are moved from a position in which identically poled magnetic fields oppose each other to one in which differently poled magnetic fields are opposite each other.

Abstract: A clamping device for gripping a blade or leaf of material and adapted to be operated with one hand. The clamping device includes two opposed walls carrying magnetic elements to lock the walls together as a result of magnetic attraction and to separate the walls in response to magnetic repulsion therebetween. A third wall pivotally connects the first two walls to permit pivotal and parallel movement of the first two walls with respect to each other.