Digital load cell assembly

• US 5,841,077 A
• Filed: 12/01/1995
• Issued: 11/24/1998
• Est. Priority Date: 12/01/1995
• Status: Expired due to Fees

• Current Assignee: Rudolph J. Kolaci
• Original Assignee: Rudolph J. Kolaci
• Inventors: Kolaci, Rudolph J.
• Primary Examiner(s): Gellner, Michael L.
• Assistant Examiner(s): Gibson, Randy W.
• Application Number:
  US08/565,665
• Time in Patent Office: 1,089 Days
• Field of Search: 174/70 R, 174/68.1, 174/25.11, 174/210 R, 174/211, 333/245
• US Class Current: 177/210.00R
• CPC Class Codes: G01G 23/3707 using a microprocessor
• CPC Class Codes: G01G 23/48 Temperature-compensating arrangements G01G1/14, G01G1/42, G01G3/18 take precedence

Abstract

A digital load cell assembly is disclosed. The digital load cell assembly includes at least one load cell for detecting an applied force and producing analog signals proportional to the applied force. The analog signals are transmitted along a cable assembly which is electrically connected to the load cell. The cable assembly has analog to digital circuitry and a power supply mounted on a printed circuit board, and is adapted to transmit digital signals representative of the force applied to the associated load cell for displaying a value corresponding to the applied force on an associated display indicator.

Claims

1. A digital load cell assembly comprising:

a load cell unit for detecting an applied force and producing analog signals proportional to said applied force;

a cable assembly electrically connected to said load cell unit, said cable assembly including analog to digital circuitry having at least one input terminal and at least one output terminal, and a first set of conductive cables connected between said load cell unit and said at least one input terminal of said analog to digital circuitry for facilitating calibration of said load cell unit and for transmitting said analog signals received from said load cell unit to said analog to digital circuitry whereby said analog signals are converted to digital signals, said cable assembly further including a second set of cables connected to said at least one output terminal of said analog to digital circuitry for transmitting said digital signals to an associated indicator which displays a value corresponding to the applied force detected by said load cell unit.

2. The digital load cell assembly of claim 1 wherein said cable assembly further comprises insulation means for insulating said at least one conductive cable and said analog to digital circuitry, said insulation means surrounding said at least one conductive cable and said analog to digital circuitry.

3. The digital load cell assembly of claim 2 wherein said cable assembly further comprises a printed circuit board arranged within said insulation means, said analog to digital circuitry being arranged on said printed circuit board.

4. The digital load cell assembly of claim 3 wherein said cable assembly further comprises power supply means arranged on said printed circuit board for providing an excitation voltage to said load cell means.

15. The digital load cell assembly of claim 1 wherein said load cell unit includes strain gauge circuitry arranged thereon.

16. The digital load cell of claim 15 wherein said strain gauge circuitry comprises a wheatstone bridge circuit.

17. The digital load cell of claim 15 wherein said load cell unit further includes a temperature sensor arranged thereon, said strain gauge circuitry and said temperature sensor being electrically connected to said first set of conductor cables so that analog signals received from said strain gauge circuitry and said temperature sensor are transmitted to said analog to digital circuitry.

5. A digital load cell assembly comprising:

load cell unit for detecting an applied force and producing analog signals proportional to said applied force;

a cable assembly electrically connected to said load cell unit, said cable assembly including analog to digital circuitry having at least one input terminal and at least one output terminal, and a first set of conductive input cables connected between said load cell unit and said at least one input terminal of said analog to digital circuitry for facilitating calibration of said load cell unit and for transmitting said analog signals received from said load cell unit to said analog to digital circuitry whereby said analog signals are converted to digital signals, and a second set of conductive output cables connected to said at least one output terminal of said analog to digital circuitry; and

an indicator for displaying a value corresponding to said applied force detected by said load cell unit, said second set of conductive output cables being connected between said at least one output terminal of said analog to digital circuitry and said indicator whereby said digital signals are transmitted from said analog to digital circuitry to said indicator.

6. The digital load cell assembly of claim 5 wherein said cable assembly further comprises insulating means for insulating said conductive input and output cables and said analog to digital circuitry, said insulating means surrounding said conductive input and output cables and said analog to digital circuitry.

7. The digital load cell assembly of claim 6 wherein said cable assembly further comprises a printed circuit board arranged within said insulating means, said analog to digital circuitry being arranged on said printed circuit board.

8. The digital load cell assembly of claim 7 wherein said cable assembly further comprises power supply means arranged on said printed circuit board for providing an excitation voltage to said load cell means.

9. The digital load cell assembly of claim 5 wherein said first set of cables comprises a greater quantity of cables than said second set of cables.

10. The digital load cell assembly of claim 9 wherein said first set of cables comprises about six cables and said second set of cables comprises about four cables.

11. The digital load cell assembly of claim 5 wherein said indicator comprises a weight display indicator.

12. The digital load cell assembly of claim 5 wherein said load cell unit includes strain gauge circuitry arranged thereon.

13. The digital load cell of claim 12 wherein said strain gauge circuitry comprises a wheatstone bridge circuit.

14. The digital load cell of claim 12 wherein said load cell unit further includes a temperature sensor arranged thereon, said strain gauge circuitry and said temperature sensor being electrically connected to said first set of conductor cables so that analog signals received from said strain gauge circuitry and said temperature sensor are transmitted to said analog to digital circuitry.