Spring body with integrated parallel guide for a balance with an upper scale

US4542800A · kind A · utility

Assignee

• Sartorius AG · DE

Inventors

• Erich Knothe · Bovenden, DE
• Matthias Eger · Wollbrandshausen, DE
• Eberhard Stadler · Göttingen, DE
• Herbert Engelhardt · Moringen, DE

Key dates

• Filing date: Dec 2, 1983
• Grant date: Sep 24, 1985
• Expiry date: Dec 2, 2003

Classification

• Technology area (CPC G): Physics
• CPC primary: G01G3/1412
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

In a spring body which is manufactured from a cubical piece, intended for a balance with an upper scale, divided into an upper and a lower guide bar by a horizontal opening extending all the way through it so that the spring body also forms the parallel guide for the balance scale, and which has wire strain gauges at thin spots in the areas of at least one guide bar the width of the spring body is divided at least in the area of the guide bars into two partial areas by a vertical opening which extends all the way through it and does not contact the edge. The vertical opening can have various shapes. The wide spring body has the advantages of in sensitivity to errors caused by off center loading and allowing the scale to be connected to the parallel-guided part of the spring body at two or three points, which reduces the stability requirements of the scale. The strain gauge are advantageously distributed so that one half of them is on each of the two areas of spring body. The strain gauges can be applied in various configurations.