Abstract: An interlocking shaft coupling including a disk-shaped body having two end faces and an interlocking element disposed on each of these faces. Each interlocking element has a substantially circular cross section and a longitudinal axis parallel to a diameter of the disk-shaped body. The coupling can be attached to opposing rotary shafts by hubs which fit over the shafts and have receiving elements which engage with the interlocking elements of the shaft coupling.

Abstract: A heat sink mounting member including a tubular member having a longitudinal axis extending through the two open ends thereof. There are means for mounting the back of the tubular member to a mounting device and recesses in the front of the modular member for permitting access to the means for mounting the back of the tubular member. The front of the tubular member includes means for mounting a device to have its heat dissipated to the tubular member to dissipate heat by conduction through the tubular member and convention of air passing through the open ends of the tubular member.

Abstract: A zero-current a.c. switching system is provided for controlling actuation of relay contacts between a power supply and a load. A primary switch selectively energizes the relay to maintain the relay contacts in the closed state. The load current flowing through the relay contacts to the load is sensed. A secondary switch responds to the sensed load current for normally conducting to energize the relay in parallel with the primary switch. The secondary switch ceases conducting each time the load current drops below a predetermined level to cease energizing the relay and open the relay contacts the next time the load current drops below the predetermined level following the opening of the primary switch.

Abstract: An electrical component encapsulation package including a cover; a base including a peripheral frame with a large central hole; and support means for mounting the electrical component above and spaced from the frame for providing an open space between the frame and component for introduction and flow of encapsulating material, and to insure integrity of the electrical connections.