Advanced thick film load cell

• US 7,360,438 B2
• Filed: 02/08/2006
• Issued: 04/22/2008
• Est. Priority Date: 02/08/2006
• Status: Expired due to Fees

• Current Assignee: Honeywell International Inc.
• Original Assignee: Honeywell International Inc.
• Inventors: Gaines, Ronald J.
• Primary Examiner(s): Lefkowitz; Edward
• Assistant Examiner(s): Kirkland, III; Freddie
• Application Number:
  US11/350,214
• Publication Number:
  US 20070180921A1
• Time in Patent Office: 804 Days
• Field of Search: 737/74, 738/623.91, 738/624.51, 738/624.74
• US Class Current: 73/774
• CPC Class Codes: G01L 1/2231 the supports being disc- or ring-shaped, adapted for measuring a force along a single direction

Abstract

A load cell apparatus and method for forming the same. A load cell apparatus is configured to include a load cell housing and a modular strain gage element that is modularly assembled into the load cell housing. The load cell housing and the modular strain gage element together form a load cell apparatus for use in electronic force sensor applications. The modular strain gage element can be configured from an Advanced Thick Film (ATF) compatible material and can be formed to include one or more contact ledges that allows for a low hysteresis and a proper boundary condition for loading either a tension state or a compression state.

Claims

1. A load cell apparatus, comprising:

a load cell housing; and

a modular strain gage element that is constructed with Advanced Thick Film (ATF) strain gages, said modular strain gage element comprising at least one contact ledge that allows for low hysteresis and proper boundary conditions for loading either in a tension state or in a compression state, said modular strain gage element modularly assembled into said load cell housing, wherein said load cell housing and said modular strain gage element together form a load cell apparatus for use in electronic force sensor applications.

2. The apparatus of claim 1 wherein said modular strain gage element comprises a strain gage surface opposite a load button formed into said modular strain gage element.

3. The apparatus of claim 1 wherein said modular strain gage element is configured from an Advanced Thick Film (ATF) compatible material.

4. The apparatus of claim 1 wherein said at least one contact ledge is configured to transfer a load to said load cell housing during high load applications thereof.

5. The apparatus of claim 1 wherein said load cell housing comprises amplifier housing configured with a hole through which a cable can enter and protrude.

6. The apparatus of claim 5 further comprising:

a cover located adjacent said amplifier housing and surrounded by said load cell housing;

a retaining slot ring located adjacent said cover, such that said cover is located between said retaining slot ring and said amplifier housing.

7. The apparatus of claim 1 wherein said modular strain gage element is welded to said load cell housing.

8. The apparatus of claim 1 wherein said modular strain gage element is snap-fitted to said load cell housing.

9. A load cell apparatus, comprising:

a load cell housing;

a modular strain gage element that is constructed of Advanced Thick Film (ATF) strain gages, wherein said modular strain gage element comprises at least one contact ledge that allows for low hysteresis and proper boundary conditions for loading either in a tension state or in a compression state, wherein said at least one contact ledge is configured to transfer a load to said load cell housing during high load applications thereof, and wherein said modular strain gage element is modularly assembled into said load cell housing, wherein said load cell housing and said modular strain gage element together form a load cell apparatus for use in electronic force sensor applications.

10. The apparatus of claim 9 wherein said modular strain gage element is welded to said load cell housing.

11. The apparatus of claim 9 wherein said modular strain gage element is snap-fitted to said load cell housing.

12. A method for forming a load cell apparatus, comprising:

a load cell housing; and

a modularly assembly comprising a modular strain gage element configured with ATF strain gages into said load cell housing, wherein said load cell housing and said modular strain gage element together form a load cell apparatus for use in electronic force sensor applications; and

comprising configuring said modular strain gage element to comprise at least one contact ledge that allows for a low hysteresis and a proper boundary condition for loading either a tension state or a compression state.

13. The method of claim 12 further comprising:

forming a load button into said modular strain gage element; and

configuring said modular strain gage element to comprise a strain gage surface opposite said load button formed into said modular strain gage element.

14. The method of claim 12 further comprising configuring said modular strain gage element from an ATF compatible material.

15. The method of claim 12 further comprising configuring said at least one contact ledge to transfer a load to said load cell housing during high load applications thereof.

16. The method of claim 12 further comprising:

configuring said load cell housing to comprise an amplifier housing; and

forming a hole within said amplifier housing through which a cable can enter and protrude.

17. The method of claim 16 further comprising:

locating a cover adjacent said amplifier housing and surrounded by said load cell housing; and

positioning a retaining slot ring adjacent said cover, such that said cover is located between said retaining slot ring and said amplifier housing.

18. The method of claim 12 wherein said modular strain gage element is welded or snap-fitted to said load cell housing.