Weighing sensor and lever

Patent metadata

Field	Value
Publication number	US-11366005-B2
Application number	US-201816764467-A
Country	US
Kind code	B2
Filing date	Nov 30, 2018
Priority date	Dec 4, 2017
Publication date	Jun 21, 2022
Grant date	Jun 21, 2022

Abstract

A weighing sensor and a lever are disclosed. The weighing sensor has a load-receiving portion, a fixing portion, and a parallel guiding portion connected to the load-receiving portion and the fixing portion. The parallel guiding portion has upper and lower parallel guiding units, separated from each other. The ends of the parallel guiding units are connected to the load-receiving portion and the fixing portion. The fixing portion has an extension located between the parallel guiding units. The extension is at a distance from both parallel guiding units and extends to the load-receiving portion. A gap is formed between the extension and the load-receiving portion; and the distance between the extension and the upper parallel guiding unit allows a lever to pass through. The weighing sensor has a simple structure, both the processing process and the assembly process are simplified, and the processing and assembly during production are facilitated.

First claim

What is claimed is:

1. A weighing sensor, arranged to receive a lever for connection to the weighing sensor by one or more leaf springs, comprising:
a load-receiving portion;
a fixing portion, having an extension toward the load-receiving portion; and
a parallel guiding portion, comprising an upper parallel guiding unit and a lower parallel guiding unit, which are separated from each other, the respective parallel guiding units having a first end connected to the load-receiving portion and a second end connected to the fixing portion, thereby connecting the load-receiving portion and the fixing portion;
wherein the extension is located between the upper parallel guiding unit and the lower parallel guiding unit, at a distance from each of the parallel guiding units, with a gap between the extension and the load-receiving portion, the distance between the extension and the upper parallel guiding unit allowing a lever to pass through and enter into a lever-accommodating space formed by the fixing portion, the upper parallel guiding unit, and the load-receiving portion;
wherein the load-receiving portion has a protrusion that extends towards the fixing portion, the protrusion having a mounting region adapted for the one or more leaf springs to be mounted; and
wherein a through-hole, located between the load-receiving portion and the protrusion in a direction perpendicular to the parallel guiding portion provides access to the mounting region for mounting the one or more leaf springs to the lever.

2. The weighing sensor of claim 1 , wherein the parallel guiding portion, the fixing portion and the load-receiving portion are integrally formed.

3. The weighing sensor of claim 2 , further comprising:
a temporary connecting sheet, or a connecting portion that is a thin sheet, that detachably connects the extension and the load-receiving portion.

4. The weighing sensor of claim 2 , wherein:
the ends of the upper parallel guiding unit that are connected, respectively, to the load-receiving portion and the fixing portion have the same cross-sectional length; or
if the cross-sectional lengths are different, then, a distance between two sides of the upper parallel guiding unit changes gradually from the cross-sectional length of the end portion connected to the load-receiving portion to the cross-sectional length of the end portion connected to the fixing portion in a direction from the end portion connected to the load-receiving portion to the end portion connected to the fixing portion.

5. The weighing sensor of claim 4 , wherein:
the change in the distance is linear from the cross-sectional length of the end portion connected to the load-receiving portion to the cross-sectional length of the end portion connected to the fixing portion.

6. The weighing sensor of claim 1 , further comprising:
a mounting portion provided at the protrusion in a direction away from the upper parallel guiding unit.

7. The weighing sensor of claim 1 , further comprising:
at least one through-hole in the load-receiving portion in a direction of the parallel guiding portion, the at least one through-hole facing the mounting portion or the mounting region.

8. A lever, suitable for a weighing sensor of claim 1 , the lever comprising:
a mounting portion connected to the fixing portion of the weighing sensor;
a coil connecting portion for mounting a coil; and
a connecting portion, in the nature of a sheet-like triangle having a base which is connected to the mounting portion and an apex which is connected to the coil connecting portion;
wherein the lever has a thickness that allows the lever to enter the lever-accommodating space of the weighing sensor through an opening provided therein.

9. The lever of claim 8 , wherein:
the coil connecting portion either is a magnet coil assembly or is provided with a magnet coil assembly.

10. The lever of claim 8 , wherein the mounting portion, the connecting portion and the coil connecting portion are integrally formed.

Assignees

• Mettler Toledo Instrument Shanghai Company Ltd
• Mettler Toledo Int Trading Shanghai Co Ltd

Inventors

• Wu Chao
• Liu Baohui
• Sun Weixiang
• Yang Chun
• Bian Naifeng
• Xu Feng

Classifications

• G01G21/24 Primary

  Guides or linkages for ensuring parallel motion of the weigh-pans · CPC title

• G01G7/02 Primary

  by electromagnetic action · CPC title

• G01G21/244

  combined with flexure-plate fulcrums (flexure-plate fulcrums G01G21/07) · CPC title