Electromagnetically compensating precision scale with flexure for thermal expansion

US4300646A · kind A · utility

Assignee

• Sartorius AG · DE

Inventors

• Franz-Josef Melcher · Hardegsen, DE
• Christoph Berg · Oettingen, DE
• Erich Knothe · Bovenden, DE

Key dates

• Filing date: Sep 27, 1979
• Grant date: Nov 17, 1981
• Expiry date: Sep 27, 1999

Classification

• Technology area (CPC G): Physics
• CPC primary: G01G21/244
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

An electromagnetically compensated precision scale has a load support guided for parallel movement by a guide assembly comprising upper and lower guides defining a triangular shape in plan connected to a housing and to the load support by flexible couplings, and wherein the guides are one-piece and define a vertical joint at the triangle apex, thereby reducing inaccurate readings caused by thermal effects.