Patent ID: 7122750

Claim:
A mechanical weighing scale comprising: a platform for supporting an object to be weighed; an analog display for indicating a weight of the object; a digital display for indicating the weight of the object; a movable member associated with a plurality of openings; a mechanical weight sensing arrangement including at least one lever mechanically responsive to the platform, a calibration plate mechanically responsive to the at least one lever, and a rack and pinion arrangement mechanically responsive to the calibration plate, the mechanical weight sensing arrangement for sensing the weight of the object supported on the platform, mechanically causing the analog display to indicate the sensed weight of the object, and moving the movable member in proportion to the sensed weight of the object; a sensor arrangement for sensing the openings as the movable member moves in proportion to the sensed weight and generating a pulse for each of the openings sensed; and a processor for counting the pulses, converting the counted pulses into a corresponding value of the weight sensed, and causing the digital display to display the value of the weight sensed; wherein the movable member is selected from the group consisting of a pointer, a gear driven rack, a rotatable drum-shaped dial and a segment of a rotatable drum-shaped dial.