System and method for operating and locking a trigger of a welding gun

• US 6,979,799 B2
• Filed: 07/31/2002
• Issued: 12/27/2005
• Est. Priority Date: 07/31/2002
• Status: Expired due to Fees

• Current Assignee: Illinois Tool Works Inc.
• Original Assignee: Illinois Tool Works Inc.
• Inventors: Centner, Robert J.
• Primary Examiner(s): Kerns, Kevin P.
• Application Number:
  US10/210,007
• Publication Number:
  US 20040020908A1
• Time in Patent Office: 1,245 Days
• Field of Search: 219/137.31, 219/137.62, 219/137.63, 200/43.17, 200/43.21, 200/332, 200/332.2, 200/43.16, 200/43.19, 200/522, 200/321, 200/322
• US Class Current: 219/137.31
• CPC Class Codes: B23K 9/10 Other electric circuits therefor; Protective circuits; Remote controls
• CPC Class Codes: B23K 9/173 and of a consumable electrode
• CPC Class Codes: B23K 9/295 using consumable electrode-wire
• CPC Class Codes: B23K 9/32 Accessories earthing connections H01R

Abstract

A welding system having a welding gun. The welding gun is adapted with a trigger. The welding gun may have a lever to lock the trigger in a desired pivoted position. The lever may pivot the trigger as the lever is pivoted. The welding gun may have a trigger extension to enable a user to pivot the trigger by depressing the trigger extension. The trigger extension may be plastically deformed. The trigger extension may be removable. The trigger extension may be rotatable.

Claims

1. A trigger assembly for a welding gun having a handle, comprising:

a base portion securable to the handle;

a trigger pivotable relative to the base portion between activated and deactivated positions; and

a lever pivotable relative to the trigger, wherein the lever is adapted to lock the trigger in the activated position.

2. The trigger assembly as recited in claim 1, wherein the lever is pivotable between a first position and a second position.

3. The trigger assembly as recited in claim 2, wherein the lever urges the trigger toward the activated position as the lever is pivoted from the first position toward the second position.

4. The trigger assembly as recited in claim 2, wherein pivotable movement of the lever toward the first position is obstructed by the handle when the lever is disposed in the second position.

5. The trigger assembly as recited in claim 4, wherein the lever is adapted with a cam portion that abuts the handle when the lever is positioned to the second position.

6. The trigger assembly as recited in claim 5, wherein the cam portion of the lever is drawn away from the handle as the trigger is pivoted from the activated position to a position toward the handle.

7. The trigger assembly as recited in claim 6, comprising a biasing spring adapted to pivot the lever away from the trigger when the cam portion is drawn away from the handle.

8. The trigger assembly as recited in claim 1, comprising a removable trigger extension adapted to direct pivotal movement of the trigger, wherein the trigger is adapted to receive the removable trigger extension.

9. The trigger assembly as recited in claim 8, wherein the trigger extension is pivotable relative to the trigger.

10. The trigger assembly as recited in claim 9, wherein the trigger extension is plastically deformable.

11. A trigger extension for a welding gun, comprising:

a plastically-deformable member pivotably secured to a pivotable trigger and operable to act as a lever to direct pivotal movement of the trigger.

12. The trigger extension as recited in claim 11, wherein the member is removably secured to the trigger.

13. The trigger extension as recited in claim 11, wherein the trigger is secured to a handle and the trigger extension has a length to enable a user to operate the trigger with the user'"'"'s hand located in the middle of the handle.

14. The trigger extension as recited in claim 11, wherein the trigger is located at one end of a handle relative to the middle of the handle and the trigger extension has a length to enable a user to operate the trigger with the user'"'"'s hand located on the opposite end of the handle.

15. A welding gun, comprising:

a handle;

a trigger pivotably secured to the handle and positionable between first and second positions, wherein transition of the trigger from the first position to the second position pivots the trigger towards the handle; and

a pivotable lever adapted to secure the trigger at the second position.

16. The welding gun as recited in claim 15, wherein the lever is pivotable relative to the trigger.

17. The welding gun as recited in claim 16, wherein the lever abuts a portion of the handle to lock the trigger at the second position.

18. The welding gun as recited in claim 17, wherein the lever is pivotable from a third position wherein the trigger is unlocked to a fourth position wherein the trigger is locked, the welding gun comprising a biasing member adapted to bias the lever toward the third position.

19. The welding gun as recited in claim 15, comprising a welding cable, wherein the handle is secured to the welding cable.

20. The welding gun as recited in claim 15, comprising a trigger extension removably secured to the trigger.

21. The welding gun as recited in claim 20, wherein the trigger extension is pivotable relative to the trigger.

22. The welding gun as recited in claim 20, wherein the trigger extension is plastically deformable.

23. A welding system, comprising:

a power source;

a cable coupleable to the power source; and

a welding gun coupled to the cable, comprising;

a handle;

a trigger secured to the handle and coupleable to the power source and pivotable between a first position and a second position relative to the handle, wherein transition of the trigger from the first position to the second position pivots the trigger towards the handle; and

a pivotable lever adapted to lock the trigger in the second position.

24. The system as recited in claim 23, wherein the lever is pivotably secured to the trigger.

25. The system as recited in claim 23, wherein the lever is pivotable between a third and a fourth position relative to the trigger, wherein the lever urges the trigger toward the fourth position relative to the handle as the lever is pivoted toward the fourth position relative to the trigger.

26. The system as recited in claim 24, wherein the lever is prevented by the handle from pivoting toward the third position relative to the trigger when the lever is disposed in the fourth position relative to the trigger.

27. The system as recited in claim 26, wherein the trigger is released from the lever by pivoting the trigger toward the handle such that a cam portion of the lever is displaced from abutment with the handle.

28. The system as recited in claim 23, comprising a wire feeder coupled to the power source to advance electrode wire through the cable.

29. The system as recited in claim 28, wherein the trigger is operable to control the advance of electrode wire from the wire feeder.

30. A welding gun, comprising:

a pivotable lever adapted to pivot a trigger to an activated position and to lock the trigger at the activated position, wherein the trigger is operable to control feeding of electrode wire from a wire feeder coupleable to the welding gun.

31. The welding gun as recited in claim 30, wherein the lever is pivotably secured to the trigger.

32. The welding gun as recited in claim 30, comprising a biasing spring adapted to pivot the lever away from the trigger.

33. A method of operating a welding system, comprising:

pivoting a lever of a welding gun from a first position to a second position to urge a trigger of the welding gun to an activated position and to lock the trigger in the activated position.

34. The method as recited in claim 33, wherein a signal is provided to the welding system to initiate an operation when the trigger is pivoted to the activated position.

35. A method of operating a welding system, comprising:

securing a pivotable trigger extension to a pivotable trigger of a welding gun; and

urging the trigger extension toward a handle of the welding gun to depress the trigger to an activated position.

36. The method as recited in claim 35, comprising removing the trigger extension.

37. The method as recited in claim 35, wherein securing a rotatable trigger extension to a trigger comprises securing a rotatable trigger extension to a trigger without use of a tool.

38. The method as recited in claim 36, wherein removing the trigger extension comprises removing the trigger extension without use of a tool.

39. The method as recited in claim 35, comprising rotating the trigger extension from a first position to a second position to enable the trigger extension to engage the trigger.