Resilient mounted multiple load element weigh scale

• US 4,489,797 A
• Filed: 02/07/1983
• Issued: 12/25/1984
• Est. Priority Date: 02/07/1983
• Status: Expired due to Fees

• Current Assignee: Circuits & Systems, Inc.
• Original Assignee: Circuits & Systems, Inc.
• Inventors: Gordon, Arnold S.
• Primary Examiner(s): Miller, Jr., George H.
• Application Number:
  US06/464,657
• Time in Patent Office: 687 Days
• Field of Search: 177/184, 177/187, 177/189, 177/128
• US Class Current: 177/128
• CPC Class Codes: G01G 21/24 Guides or linkages for ensuring parallel motion of the weigh-pans
• CPC Class Codes: G01G 3/1408 the supports being of the column type, e.g. cylindric

Abstract

An improved weighing scale comprises a base support for a plurality of load cells, a resilient load decoupling member for each load cell, and a platform. The resilient load decoupling member allows each load cell to be decoupled from non-vertical forces, but still provides positioning and self-centering means. The load cells provide an output signal indicative of the applied weight on the platform.

Claims

1. A weighing scale comprising:

a platform having one or more receiving members arranged to receive one or more decoupling members;

a base;

one or more load cells attached to said base; and

one or more resilient decoupling members wherein each of said one or more decoupling members both circumscribes the top end of said load cells and engages one of said receiving members of said platform such that said receiving member circumscribes at least part of said decoupling member, such that vertical forces applied to said platform are measured by said one or more load cells while non-vertical forces are decoupled.

2. A weighing scale according to claim 1 wherein:

said one or more receiving members of said platform comprise at least three receiving members;

said one or more load cells comprise at least three load cells; and

said one or more decoupling members comprise at least three decoupling members.

3. A weighing scale according to claim 1 wherein:

said one or more decoupling members are comprised of compression molded silicone.

4. A weighing scale according to claim 1 wherein:

said one or more receiving members of said platform comprise four members;

said one or more load cells comprise four load cells; and

said one or more decoupling members comprise four decoupling members.

5. A weighing scale according to claim 4 wherein:

said resilient decoupling members each comprise a severely truncated solid cylinder with a recess arranged to receive one of said load cells such that said decoupling member circumscribes the top end of said load cell.

6. A weighing scale according to claim 5 wherein:

said severely truncated solid cylinder is lightly tapered upwardly.

7. A weighing scale according to claim 6 wherein:

said platform and said base are cast rib structures.

8. A weighing scale according to claim 5 wherein:

said load cells are generally cylindrical; and

said recess in said resilient decoupling member is generally circular.

9. A weighing scale according to claim 8 wherein:

each of said resilient decoupling members further comprises a circular extrusion concentrically located on top of said solid cylinder; and

each of said platform receiving members is arranged to circumscribe at least said circular extrusion and at least part of said sylinder of said resilient decoupling member.

10. A weighing scale according to claim 8 wherein:

said generally circular recess in said resilient decoupling member is concentrically located in said resilient decoupling member.

11. A weighing scale according to claim 10 wherein:

each of said resilient decoupling members further comprises a circular extrusion concentrically located on top of said solid cylinder; and

each of said platform receivinc members is arranged to circumscribe at least said circular extrusion and at least part of said cylinder of said resilient decoupling member.

12. A weighing scale according to claim 11 wherein said circular extrusion of said resilient member acts as a positioning pad to align said platform with said base.

13. A weighing scale according to claim 12 wherein:

said severely truncated solid cylinder is slightly tapered upwardly; and

said circular extrusion is slightly tapered upwardly.

14. A resilient decoupling member for a weighing scale having a platform with a receiving member and a load cell, comprising:

a resilient solid body with a recess on the bottom side for receiving a load cell, said solid body being arranged on its top side for engaging said receiving member of said weighing scale such that said receiving member circumscribes at least part of said solid body.

15. A resilient decoupling member according to claim 14 wherein:

said resilient solid body is of generally a severely truncated cylindrical shape; and

said recess is generally circular and concentric in said solid body such that said decoupling member circumscribes the top of said load cell.

16. A resilient decoupling member according to claim 15 further comprising:

a circular extrusion concentrically located on the top of said solid body wherein said platform of said weighing scale circumscribes at least said circular extrusion.

17. A resilient decoupling member according to claim 16 wherein:

said circular extrusion acts as a positioning pad to properly align said platform over said load cell.

18. A resilient decoupling member according to claim 16 wherein:

said resilient severely truncated solid body is slightly tapered upward; and

said circular extrusion of said resilient solid body is slightly tapered upward.

19. A resilient decoupling member according to claim 18 wherein:

the diameter of said circular extrusion is at least as large as the diameter of said recess.

20. A resilient member according to claim 19 wherein:

said resilient decoupling member introduces less than 0.1% error in the accuracy of said weighing scale.