Abstract: A combined trolley and seat unit has an inverted U-shape main frame with principal frame side members carrying ground-engaging wheels and having a main frame support rigidly fixed thereto and to a projecting bag support which carries the lower end of a bag the upper end of which is hooked by a pocket over a hook. A folding seat frame having a U-shape leg frame is pivotally carried on the main frame on the side thereof remote from the bag-like container and is movable between a folded position lying substantially parallel to the main frame and an unfolded position in which a front leg frame to which the seat frame is attached contacts the ground and the wheels are spaced from the ground to allow the unit to be used as a seat with no risk of rolling movement.

Abstract: A pipe-coupling assembly includes a radially-extending ring-shaped member rrying a flow-controlling valve plate. Ring-supporting members press flushly against both sides to operatively mount the ring member and its valve plate in the conduit. Non-reversibility is achieved by forming a lateral flange on one side only of the ring member and a mating groove in one only of its support members. Correct mounting requires the mating of the flange and groove.

Abstract: A compressed air power plant is disclosed wherein compressed air may be stored underground and later utilized as required. The storage facilities include a heat storage covern which contains an external water barrier and a heat insulating lining. Compressed air flows from the power plant in series through the heat storage cavern and then to an air storage cavern.