Abstract: An assembly which involves a ratchet wheel adapted to be rotated by incremental steps to drive a shaft connected thereto. A rotatable pushbutton is mounted through a hole in the chassis and is connected to a rod to which a flexible pawl is mounted parallel to the rod. When the pushbutton is in one rotary position, inward pressure strokes on the pushbutton cause the pawl to engage teeth in one region of the ratchet wheel causing it to move in a clockwise direction. When the pushbutton is rotated 180.degree. to a second rotary position, each inward push on the pushbutton causes the pawl to engage respective teeth in another region of the wheel thereby moving the wheel incrementally one step in a counterclockwise direction.

Abstract: A damping subassembly for a weigh cell or the like comprises a sprocket wheel, a spool-like valve and a perforated piston disc assembled coaxially, the sprocket and the valve being mounted for movement in unison as the sprocket is rotated about its axis. When the sprocket-valve combination is rotated, its axial separation from the perforated disc is varied. The sprocket, valve and perforated disk are mounted to the weighing platform for axial movement in such a way that sprocket, valve and disc move upwardly and downwardly. A fixed-position bracket has an aperture in which a removable dashpot cup is mounted, the aperture and cup also being coaxially mounted relative to the sprocket, valve and piston disc. The valve-piston disc assembly moves axially into the cup through the aperture in the bracket.