Mettler Instrumente Ag

Walter E Kupper

Diethelm Utzinger

A single unit made of a light metal or alloy preferably in a diecast process is shaped to constitute the frame, the levers, and hinged bearings of a platform scale. Even the measuring element can be integrated into this one-piece unit. The resultant scale has a very low profile and is particularly suitable for mass manufacture for applications not requiring excessive resolution as, for example, post office scales or scales for home use.

Weighing scale of unitary construction

When the difference between the weight proportional signal and the tare value is less than a predetermined threshold value, it is assumed that the zero point is changing. Main difference signals less than the threshold signal are stored and subsequently generated ones algebraically added to the first one. The so-created cumulative difference signal is compared to a predetermined limiting value. When it exceeds the limiting value the cumulative difference signal is divided by the number of differences which together created the cumulative difference signal. The so-formed average difference signal is added to the tare value prior to generation of the next main difference signal.

Weighing balance with automatic zero correction

A cantilever beam is located under the pan of the scale and carries a strain gauge bridge circuit. The beam has a bore perpendicular to its longitudinal axis. A rigid force transmitting arm is screwed to the free end of the beam and extends back so that a conical peg in the arm projects into the bore. The conical peg engages a rod which transmits a force from the load to be weighed. The beam has two arcuate recesses symmetrical to the bore on its underside. Strain gauge resistors are positioned so that their centers coincide with the thinnest, and therefore maximum bending sections of the beam.

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Madison, NJ, United States of America

Walter E Kupper