Tire defect tester

• US 8,733,160 B2
• Filed: 09/25/2012
• Issued: 05/27/2014
• Est. Priority Date: 05/29/2007
• Status: Active Grant

• Current Assignee: Paul E. Hawkinson Company
• Original Assignee: Paul E. Hawkinson Company
• Inventors: Range, David E., Box, Gary William
• Primary Examiner(s): Caputo, Lisa
• Assistant Examiner(s): JENKINS, JERMAINE L
• Application Number:
  US13/626,638
• Publication Number:
  US 20130139581A1
• Time in Patent Office: 609 Days
• Field of Search: None
• US Class Current: 73/146
• CPC Class Codes: G01M 17/02 Tyres
• CPC Class Codes: G01M 17/022 the tyre co-operating with rotatable rolls
• CPC Class Codes: G01M 3/40 by using electric means, e.g. by observing electric discharges
• CPC Class Codes: G01N 27/205 in insulating materials
• CPC Class Codes: G01N 27/24 Investigating the presence of flaws

Abstract

A tire defect tester and a method of operation are disclosed. In one aspect, the tire defect tester includes a first electrode arranged to direct energy toward a tire, and a second electrode arranged on an opposite side of the tire from the first electrode to receive energy passing through the tire from the first electrode. The tire defect tester further includes an energy sensor electrically connected to the second electrode and a fault indicator circuit responsive to the energy sensor and configured to indicate the presence of a flaw upon energy above a threshold level being sensed at the second electrode.

Claims

1. A method of testing tires for defects, the method comprising:

charging a capacitor;

generating an energy signal, the generating an energy signal comprising selectively triggering a rectifier and discharging the capacitor;

passing the energy signal through a transformer to increase a voltage of the energy signal;

directing the energy signal toward a first location on a first surface of a tire;

detecting an attenuated energy signal on a second surface of the tire, the second surface opposing the first surface; and

comparing the attenuated energy signal to a predetermined energy signal value to determine the presence of a flaw in the tire.

2. The method of claim 1, wherein the predetermined energy signal value includes a threshold energy signal value.

3. The method of claim 2, wherein the threshold energy signal value is a signal value selected by a user.

4. The method of claim 1, wherein the predetermined energy signal value includes a previously-observed energy signal value.

5. The method of claim 1, further comprising:

rotating the tire;

charging the capacitor;

generating a second energy signal, the generating a second energy signal comprising selectively triggering the rectifier and discharging the capacitor;

passing the second energy signal through a transformer to increase a voltage of the second energy signal;

directing the second energy signal toward a second location on the first surface of the tire;

detecting a second attenuated energy signal on the second surface of the tire; and

comparing the second attenuated energy signal to the predetermined energy signal value to determine the presence of a flaw in a tire at the second location.

6. The method of claim 1, further comprising rotating the tire.

7. The method of claim 6, further comprising, upon determining the presence of a flaw in the tire, halting rotation of the tire to indicate the location of the flaw.

8. The method of claim 1, further comprising periodically generating energy signals to be directed toward a surface of the tire by an energy source.

9. The method of claim 1, further comprising storing a record of the flaw in a memory.

10. The method of claim 1, further comprising performing statistical analysis of flaws detected by the tire tester.

11. The method of claim 1, further comprising, upon detection of a flaw in the tire, activating a tire flaw indicator.

12. The method of claim 1, further comprising:

repeating the acts of charging a capacitor, generating an energy signal, passing the energy signal through a transformer, and directing the energy signal toward a first location on a surface of the tire.

13. The method of claim 12, wherein repeating the acts of charging a capacitor, generating an energy signal, passing the energy signal through a transformer, and directing the energy signal toward a first location on a surface of the tire generates a waveform.

14. The method of claim 13, wherein the waveform is a saw-tooth wave form.