Weight sensor

US6365847B1 · kind B1 · utility

Assignee

• Sartorius AG · DE

Inventors

• Michael Müller · Hennef (Sieg), DE
• Ulrich Bajohr · Oettingen, DE
• Rudolf Muller · Frankfurt, DE
• Werner Schulze · Göttingen, DE
• Detlef Erben · Göttingen, DE
• Herbert Engelhardt · Moringen, DE

Key dates

• Filing date: May 22, 2000
• Grant date: Apr 2, 2002
• Expiry date: May 22, 2020

Classification

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

Abstract

In a weight sensor operating according to the principle of electromagnetic force compensation, the essential parts are fabricated from a single block of material. The weight sensor has a load receiver (10), which is connected through an upper guide (12) and a lower (11) guide to the housing-integral base body (1) of the material block. The weight sensor also has several force-reduction translating levers (21,22; 24, 25,25′; 27,27′,28) and coupling elements (18,18′, 23, 26,26′) between the translating levers (21, 22; 24 ,25,25′; 27,27′,28). The housing-integral base body (1) projects in the direction of the load receiver (10), extends into the space between the two guides (11, 12) and forms a support point for the first translating lever (21, 22). The weight sensor is equipped with a coil (34), which is fastened at the longer lever arm (28) of the last translating lever (27,27′,28,29,29′) and is situated in the magnetic field of a permanent magnet. To reduce the overall height and to receive higher loads, at least one translating lever is at least partially split into two partial levers (25, 25′; 27,27′; 29,29′). At l…