Qualifier

• US 6,810,335 B2
• Filed: 03/26/2003
• Issued: 10/26/2004
• Est. Priority Date: 03/12/2001
• Status: Active Grant

• Current Assignee: CE Electronics, Inc.
• Original Assignee: CE Electronics, Inc.
• Inventors: Lysaght, Richard G.
• Primary Examiner(s): Barlow, John
• Assistant Examiner(s): Dougherty, Anthony T.
• Application Number:
  US10/397,538
• Publication Number:
  US 20030212534A1
• Time in Patent Office: 580 Days
• Field of Search: 702/190, 702/41, 702/44, 702/138
• US Class Current: 702/41
• CPC Class Codes: B23P 19/066 by electrical means
• CPC Class Codes: B25B 23/14 Arrangement of torque limiters or torque indicators in wrenches or screwdrivers couplings for transmitting rotation or clutches F16D; devices for measuring torque per se G01L

Abstract

This qualifier uses multiple thresholds and multiple timers to perform its operations. This assembly qualifier is a counting apparatus that monitors either the pressure of a pulsing air tool. The qualifier includes a microprocessor that is configured to indicate a pulsing region when the measured air pressure is between the third stored air pressure and the fourth stored air pressure.

Claims

1. A system for monitoring a compressed air driven, pulse tool comprising:

a means for measuring air pressure between the trigger of a pneumatic pulse tool and the motor and converting the air pressure into an electrical signal representative of the air pressure;

a means for electrically computationally processing the electrical signal into another signal representative at least one parameter corresponding to a condition of the tool being monitored which is a function of air pressure;

a programmed microprocessor configured to identify a portion of the signal representative of the air pressure corresponding to the parameter;

wherein the programmed microprocessor is configured to identify and store the parameter of a first threshold air pressure to begin monitoring the parameter of a cycle;

wherein the programmed microprocessor is configured to identify and store the parameter of a second air pressure to identify a portion of the signal representative of the air pressure of the tool driving a fastener to its target torque;

wherein the programmed microprocessor is configured to identify and store the parameter of a third air pressure to count a completed cycle when the measured air pressure is in the same as the third identified and stored parameter;

wherein the programmed microprocessor is configured to identify and store the parameter of a fourth air pressure to indicate a shut off region of the cycle when the measured air pressure is above the fourth identified and stored parameter;

wherein the microprocessor is configured to indicate a pulsing region when the measured air pressure is between the third stored air pressure and the fourth stored air pressure; and

wherein the programmed microprocessor is configured to confirm that the measured air pressure is in the pulsing region.

2. A system according to claim 1 wherein the programmed microprocessor is configured to identify and store the parameter of a minimum peak to valley differential pulse width when the measured air pressure is between the third identified and stored parameter and the fourth identified and stored parameter.

3. A system according to claim 1 wherein the microprocessor is configured to retrieve a pulse widths worth of data preceding the current measured air pressure from the stored parameter.

4. A system according to claim 3 wherein the microprocessor is configured to identify a center data point from the stored parameter, based on time.

5. A system according to claim 4 wherein the microprocessor is configured to identify if data points are on both sides of the center point that are less than or equal to the pressure value of the center point.

6. A system according to claim 5 wherein the microprocessor is configured to report a number of pulses in the measured air pressure.