Torque-angle instrument

• US 7,565,844 B2
• Filed: 11/22/2006
• Issued: 07/28/2009
• Est. Priority Date: 11/28/2005
• Status: Active Grant

• Current Assignee: Snap-On Incorporated
• Original Assignee: Snap-On Incorporated
• Inventors: Thorell, Marvin D., Beyerl, Paul J., Hackl, Richard J., Marquette, Matthew S., Crass, Matthew M., Becker, Thomas P.
• Primary Examiner(s): Caputo; Lisa M
• Assistant Examiner(s): Kirkland, III; Freddie
• Application Number:
  US11/603,540
• Publication Number:
  US 20070144270A1
• Time in Patent Office: 979 Days
• Field of Search: 7386221-86223
• US Class Current: 73/862.21
• CPC Class Codes: B25B 23/1425 by electrical means

Abstract

An electronic torque-angle instrument including a generally tubular body having a gripping section and a pivoting head for engaging a workpiece, such as a nut or bolt, and a housing associated with the body and containing electronics, including a microprocessor, which permit individual or simultaneous measurement of torque and angle applied to the workpiece. The microprocessor includes stored programs which interpret a signal from an input, such as a gyroscopic sensor, and sends the interpreted signal to an output means. The signal is finally displayed as an accurate torque measure and/or angle measure from the output means.

Claims

1. A method for measuring applied torque and applied angle to a workpiece either individually or simultaneously comprising the steps of:

providing a wrench having a gripping section, a drive head, and internal circuitry coupled to the drive head, wherein the circuitry comprises a microprocessor having stored programming, input means, output means, and a power supply for powering the microprocessor, the input means and the output means, wherein the stored programming comprises wrench operation modes including at least torque calibration, angle calibration, torque measure, and torque and angle measure;

selecting one of operations modes through operation of the input means;

engaging the drive head of the wrench to a workpiece;

applying torque to the workpiece around the drive head;

operating the input means to create a first signal related to both instantaneous torque and angle values being applied to the workpiece during the step of applying torque to the workpiece around the drive head;

receiving the first signal into the microprocessor from the input means;

interpreting the first signal by the stored programming, including continuously calculating a bending beam correction factor by processing the first signal to determine a corrected angle value;

sending the interpreted signal to the output means;

displaying the interpreted signal, wherein the signal is displayed as both an accurate torque measure and an angle measure from the output means.

2. The method of claim 1, wherein the circuitry input means comprises a gyroscopic sensor for measuring the rate of rotation around the drive head.

3. The method of claim 1, wherein the step of displaying the interpreted signal comprises the step of simultaneously displaying an accurate torque measure and angle measure.

4. The method of claim 1, wherein the step of displaying the interpreted signal comprises the step of alternating between display of the torque measure and the angle measure.

5. The method of claim 1, further comprising the step of controlling an alert signal by the microprocessor.

6. The method of claim 5, wherein the alert signal indicates coincidence with a preset condition.

7. The method of claim 5, wherein the alert signal indicates an over-torque condition.

8. An electronic torque-angle instrument comprising:

a generally tubular body including a gripping section and a pivoting head for engaging a workpiece, such as a nut or bolt; and

a housing associated with the body and containing electronics, including input means electronically coupled to a microprocessor for sending input signals, which permit individual and simultaneous measurement and display of both torque and angle applied to the workpiece and wherein the microprocessor comprises stored programs comprising wrench operation modes including at least torque calibration, angle calibration, torque measure, and torque and angle measure, each of which interprets the input signals from the input means to continuously calculate a bending beam correction factor by processing the input signals to determine a corrected angle value, thereby accurately determining both torque and angle applied to the workpiece.

9. The electronic torque-angle instrument of claim 8, wherein the input means comprises a gyroscopic sensor.

10. The electronic torque-angle instrument of claim 8, further comprising display means for displaying the interpreted input signal.

11. The electronic torque-angle instrument of claim 8, further comprising display means for simultaneously displaying an accurate torque measure and angle measure.

12. The electronic torque-angle instrument of claim 8, wherein the display means is capable of alternating between display of the torque measure and the angle measure.

13. The electronic torque-angle instrument of claim 8, wherein the microprocessor comprises a control means for activating an alert signal.

14. The electronic torque-angle instrument of claim 13, wherein the alert signal indicates coincidence with a preset condition.

15. The electronic torque-angle instrument of claim 13, wherein the alert signal indicates an over-torque condition.