Weighing scale with capacitor transducer
AssigneePelouze Scale Co.
InventorFrans Brouwer
Life of this patent
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Abstract
A platform type weighing scale comprising a differential capacitor transducer having one double-segment movable plate attached to an elongated weighing beam and two double-segment fixed plates attached to a U-shaped channel. The weighing beam is housed within the cavity defined by the channel. The ends of both the weighing beam and the channel are fixed to tape-pulley supported structures to produce turning moments which move the center of the weighing beam in a vertical plane substantially more than the channel is moved in the same plane. This difference in the relative position of the weighing beam and channel translates into a weight responsive change in the relative position of the fixed and movable capacitor plates to produce a weight readout.
Claims10
In a weighing scale, the improvement comprising:
- an elongated weighing beam, turning means attached to the ends of the beam to flex the center portion of the beam responsively to weight variations on the scale, elongated capacitor plate support means positioned adjacent the weighing beam with its ends being coupled to the turning means so that the support means moves less responsively than the center of the beam to weight variations, and a capacitor transducer having at least one relatively movable plate coupled to a mid-portion of the weighing beam and one relatively fixed plate coupled to the capacitor plate support means adjacent the movable plate whereby capacitance variations are weight responsive.
Dependencies are inferred from the claim text.