Electronic balance with scale on top and corner-load adjustment

• US 4,798,251 A
• Filed: 04/01/1988
• Issued: 01/17/1989
• Est. Priority Date: 04/01/1987
• Status: Expired due to Term

• Current Assignee: Sartorius Gmbh
• Original Assignee: Sartorius Gmbh
• Inventors: Bierich, Eduard, Stadler, Eberhard, Maaz, Gunther
• Primary Examiner(s): Miller, Jr., George H.
• Application Number:
  US07/176,630
• Time in Patent Office: 291 Days
• Field of Search: 177/164, 177/229
• US Class Current: 177/229
• CPC Class Codes: G01G 21/244 combined with flexure-plate fulcrums flexure-plate fulcrums G01G21/07

Abstract

The invention discloses an electronic balance with a scale on top, a balance scale, a balance scale carrier, two identical guide rods (7,8) which connect in an articulated manner the balance scale carrier and the balance scale in the form of a parallel guide to a system carrier (1/5) fixed to the housing and with at least one corner-load adjustment lever (22'"'"') which is connected to the system carrier via a thin area (24) and which carries a support point in the vicinity of this thin area (24) for the end of a guide rod (7) on the system carrier that the corner-load adjustment lever (22'"'"') is bent at right angles between the support point of the guide rod (7) and the thin area (24) to the system carrier (1,5) in such a manner that the moving joint (17) of the guide rod (7) and this thin area (24) are at the same height. As a result, even great forces in the guide rods such as those which occur at an off-center loading of the balance scale do not cause any torque on the corner-load adjustment lever and thus result in a very stable corner-load adjustment.

Claims

1. In an electronic balance with a scale on top, a balance scale (4), a balance scale carrier (2), two identical guide rods (7,8) which connect in an articulated manner the balance scale carrier and the balance scale in the form of a parallel guide to a system carrier (1/5) fixed to the housing and with at least one corner-load adjustment lever (22,22'"'"',22") which is connected to the system carrier via thin area (21,24,30/31) and which carries a support point in the vicinity of this thin area for the end of a guide rod on the system carrier, comprising that the corner-load adjustment lever (22,22'"'"',22",22'"'"'") is bent at right angles between the support point of the guide rod (7) and the thin area (21,24,30/31) to the system carrier (1/5) in such a manner that the moving joint (16,17) of the guide rod (7) and the thin area (21,24,30/31) are at the same height.

2. Electronic balance with scale on top according to claim 1, wherein the guide rods (7,8) are designed so that their neutral axis is at the same height as the moving joint (16,26,17,27) of the guide rod (7,8) and the thin area (21,14,30/31) between the corner-load adjustment lever (22,22'"'"',22") and the system carrier (1/5).

3. Electronic balance with scale on top according to claim 1, wherein the thin area (24) between the corner-load adjustment lever (22'"'"') and the system carrier (1/5) is formed by a milling from above and a milling from below so that the height of the thin area (24) can be somewhat varied by selecting the particular milling depth.

4. Electronic balance with scale on top according to claim 1, wherein a platelet (33) is inserted between each corner-load adjustment lever (22'"'"'") and guide rod (7) and that the moving joint (16,17) of the guide rod (7) can be brought to the correct height in relation to the thin area (21) of the corner-load adjustment lever (22'"'"'") by selecting the thickness of this platelet (33).

5. Electronic balance with scale on top according to claim 1, wherein the corner-load adjustment lever (22") is bent at right angles between the support point of the guide rod (7) and the thin area (30/31) to the system carrier (1/5) in such a manner that the moving joint (16,17) of the guide rod (7) and the effective center of rotation of the corner-load adjustment lever (22") are at the same height.

6. Electronic balance with scale on top according to claim 5, wherein the section (30) of the thin area (30/31) is reinforced by a reinforcing metal sheet (29) so that the effective center of rotation of the corner-load adjustment lever (22") can be somewhat varied in its height by selecting the thickness of the reinforcing metal sheet (29).