Abstract: A driving apparatus for telescopic antenna, including an electric motor, a driving clutch member connected to the motor to be rotated by the motor, a driven clutch member opposite to the driving clutch member to define a viscous fluid containing space in association with the driving clutch member and connected to a telescopic antenna to extend and contract the telescopic antenna, and a viscous fluid contained in the viscous fluid containing space.

Abstract: A carrier-driving device mainly used for a video-projection system, preferably comprising a carrying member to be loaded with a projector mirror; two supporting arm assemblies each having telescopically elongatable hollow arms, on which the carrying member is supported; two driving cables for moving the hollow arms telescopically; driving wheels having peripheral teeth and engaging with the cable; a device for rotating the wheels; and a disengaging device for disengaging the drive wheels so that the mirror can be manually actuated when needed. The cables are each characterized by a belt-like shaped central portion, with strong and resilient side portions formed on both sides of the central portion and a plurality of holes so formed in the central portion as to be aligned in the longitudinal direction of the cable at a predetermined pitch, thereby to engage the holes with the peripheral teeth of the respective drive wheel.