Abstract: A portable sprayer comprising a generally cylindrically shaped tube and an air volume chamber, a piston rod inserted in the cylinder, a container for holding a material, a spray nozzle, and a delivery tube inserted in the container and extended to the spray nozzle is contained in a single unit. The spraying operation is activated by applying a pumping action to the piston rod. An air control valve mounted to the sprayer allows for the rapid bleed off of air from the unit. The preferred embodiment of the invention is of a size and weight so that it may easily carried.

Abstract: A shiftable variable ratio sprocket chain drive for rider propelled vehicles, such as bicycles, and for other uses has a shifting mechanism, such as a derailleur mechanism or a gear mechanism, a shifting actuator operable by the rider or user, and a novel hydraulic connector operatively connecting the actuator and the shifting mechanism for hydraulically operating the shifting mechanism to vary the ratio of the drive in response to operation of the actuator.