Low range automatic weighing device

A weighing device comprising:

• a frame;
• a pan element for supporting a load to be weighed;
• means connected to said pan for retaining a plurality of weight elements in a vertically movable manner;
• a motor supported within said frame;
• a shaft member operatively connected to and extending from said motor and supporting said pan element;
• a plurality of support members each including a cam follower and each adapted to receive and lift one of said weight elements;
• two circular concentric cam tracks rotating with said shaft member, each of said tracks (i) have a different radius of curvature, (ii) are positioned diammetrically across from one another and (iii) are positioned under a plurality of said cam followers;
• and
• switching means for energizing said motor when said pan is depressed by a weighted load, said motor turning said shaft member and guiding the two concentric cam tracks alternately into contact with successive cam followers on said support members in a step-by-step manner to lift a number of said support members and alternately raise said weight elements diametrically across from each other and thereby lift a corresponding number of said weights substantially equal to the weight of said load.