Abstract: A spring assist drive for pedal operated vehicles such as bicycles and tricycles makes use of a wind-up spring in the train of power from the pedal operated power sprocket to the drive sprocket for the rear drive wheel. The wind-up spring is a coil spring, the inside end of which is anchored to an axle for a relatively smaller sprocket in chain driving engagement with the sprocket on the rear drive wheel. The outside end of the spring is anchored to a relatively larger sprocket and chain driven from the pedal operated power sprocket.

Abstract: A cage for the housing of pet birds makes use of a relatively large enclosure on the floor of which is a removable litter tray. Near the top of the cage at each of two rear corners is a plastic container removably supported on brackets, one providing food and drinking water, the other providing bath water. A separate door in the side wall of the cage accommodates each container so that it can be individually removed for cleaning and replaced. A decorative tree-like perch of darkened material has an arm extending to a location in front of each container, the arm having an access hole in it in alignment with a matching hole in the wall of the container, in that manner to make the access holes readily apparent and available to bird occupants. The tree-like perch and other perches are suspended from appropriate walls of the cage for ready removal, cleaning and replacement.