Self-contained locking trigger assembly and systems which incorporate the assembly

• US 6,987,244 B2
• Filed: 10/31/2002
• Issued: 01/17/2006
• Est. Priority Date: 07/31/2002
• Status: Expired due to Fees

• Current Assignee: Illinois Tool Works Inc.
• Original Assignee: Illinois Tool Works Inc.
• Inventors: Bauer, Gregory W.
• Primary Examiner(s): Stoner, Kiley S.
• Assistant Examiner(s): Tran, Len
• Application Number:
  US10/284,720
• Publication Number:
  US 20040020910A1
• Time in Patent Office: 1,174 Days
• Field of Search: 219/132, 219/139, 219/137.31, 219/137.63, 219/137.42, 219/137.62, 219/138, 200/43.17, 200/318.2, 200/321
• US Class Current: 219/137.31
• CPC Class Codes: B23K 9/10 Other electric circuits therefor; Protective circuits; Remote controls
• CPC Class Codes: B23K 9/1006 Power supply
• 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 implement with a self-contained trigger and trigger locking assembly. The self-contained trigger and trigger locking assembly has a trigger which, when operated, regulates the flow of current from a power source. The trigger lock of the assembly has a movable portion which includes a groove which can engage a complementary structure on the trigger to maintain the trigger in an operating position, thereby allowing continued flow of current from the power source.

Claims

1. An arc welding system, comprising:

an electric power source; and

a welding implement electrically coupleable to the electric power source, comprising;

a handle; and

a self-contained trigger and trigger lock assembly operably coupled to the handle, comprising;

a trigger which possesses at least two states, wherein each state allows a different amount of an electric current to flow between the electric power source and the welding implement; and

a trigger lock pivotably coupled to the trigger, wherein the trigger lock, when locked, prevents the trigger from changing states.

2. The system as recited in claim 1, wherein the trigger possesses an on-state allowing current to flow to the welding implement and an off-state preventing current from flowing to the welding implement.

3. The system as recited in claim 1, wherein the self-contained trigger and trigger lock assembly further comprises a conductive terminal that completes a circuit when the trigger is in a first state but does not complete the circuit when the trigger is in a second state.

4. The system as recited in claim 1, wherein the handle comprises a plurality of handle pieces, wherein the plurality of handle pieces and a fixed portion of the self-contained trigger and trigger lock are conformably configured such that the plurality of handle pieces secure the fixed portion of the self-contained trigger and trigger lock assembly when the handle is assembled together.

5. The system as recited in claim 1, wherein the trigger lock is configured to engage with a locking structure disposed on the trigger when the trigger is operated such that, when the trigger lock engages with the locking structure, the trigger lock is locked.

6. The system as recited in claim 5, wherein the locking structure comprises at least one of a notch, a groove, a peg, a hole, a hook, and a catch.

7. The system as recited in claim 5, wherein the trigger lock comprises a complementary structure configured to engage complementary with the locking structure, wherein the complementary structure comprises at least one of a notch, a groove, a peg, a hole, a hook, and a catch.

8. A welding system, comprising:

a welding device;

a welding implement electrically coupleable to the wire-feed welding device, the welding implement comprising a handle configured to securely receive a separable locking trigger assembly, wherein the separable locking trigger assembly comprises;

an attachment portion configured to be securely receivable by the handle for securing the locking trigger assembly to the handle;

a trigger that is pivotably secured to the attachment portion, wherein at least one operation of the welding system is controllable by the position of the trigger; and

a trigger lock that is pivotably secured to the attachment portion to maintain the trigger in a desired position.

9. The system as recited in claim 8, wherein the trigger lock comprises a movable portion connected to a locking lever pivotably secured to the attachment portion, wherein the movable portion comprises a locking structure configured to engage a complementary structure disposed on the trigger such that engagement of the locking structure and the complementary structure restricts movement of the trigger.

10. The system as recited in claim 9, comprising a trigger spring to bias the trigger relative to the attachment portion such that the trigger is in a first position in the absence of an external applied force.

11. The system as recited in claim 9, comprising a trigger lock spring to bias the trigger lock relative to the trigger such that the trigger lock is unlocked in the absence of a locking force, wherein the locking force includes at least one of a force applied by a user and a resistance generated by engagement of the locking structure and the complementary structure.

12. The system as recited in claim 8, wherein the welding device comprises a wire feeder, the at least one operation of the welding system being directing the wire feeder to feed electrode wire from the wire feeder.

13. The system as recited in claim 8, wherein the welding device comprises a power source, the at least one operation of the welding system being directing the power source to apply power to the welding implement.

14. A welding implement, comprising:

a handle coupled to the nozzle, wherein the handle is configured to securely receive a self-contained trigger and trigger lock assembly operable to be electrically coupled to a power source, wherein the self-contained trigger and trigger lock assembly comprises;

an attachment portion configured to be securely receivable by the handle;

a trigger pivotably secured to the attachment portion, wherein the position of the trigger is configured to direct a flow of a current from the power source to the nozzle; and

a trigger lock pivotably operable to secure the trigger in a desired position to maintain the power source in a desired state of operation.

15. The welding implement as recited in claim 14, comprising a trigger lock spring which biases the trigger lock in an unlocked position in the absence of a locking force, wherein the locking force comprises at least one of a force supplied by an operator and a resistance created by the engagement of a locking region on the trigger lock and a complementary region on the trigger.

16. The welding implement as recited in claim 15, wherein the locking region comprises at least one of a protuberance, an indentation, a hole, a hook, and a catch.

17. The welding implement as recited in claim 15, wherein the complementary region comprises at least one of a protuberance, an indentation, a hole, a hook, and a catch.

18. The welding implement as recited in claim 14, wherein the self-contained trigger and trigger lock assembly comprises an electrical connector operably coupled to the trigger, wherein the electrical connector is configured to complete an electric circuit when the trigger is operated.

19. The welding implement as recited in claim 14, wherein the welding implement comprises a plurality of handle pieces that are assembled together to form the handle, wherein the plurality of handle pieces and the attachment portion of the self-contained trigger and trigger locking assembly are adapted such that the plurality of handle pieces secure the self-contained trigger and trigger locking assembly when the handle is assembled.

20. The welding implement as recited in claim 14, wherein the welding implement is coupleable to a welding cable adapted to convey electrode wire from a wire feeder, wherein the trigger also controls electrode wire flow from the wire feeder.

21. The welding implement as recited in claim 20, wherein the welding cable is adapted to convey gas from a supply of gas, wherein the trigger also controls gas flow from the supply of gas.

22. A welding implement kit, comprising:

a self-contained trigger and trigger locking assembly comprising;

a base securable to a welding implement;

a trigger coupled to the base and positionable relative to the base; and

a trigger lock pivotably positionable relative to the base and adapted to selectively lock the trigger in a desired position relative to the base.

23. The welding implement kit as recited in claim 22, wherein the trigger lock is pivotably secured to the base.

24. The welding implement kit as recited in claim 23, wherein the trigger is pivotably secured to the base.

25. The welding implement kit as recited in claim 24, wherein the trigger lock comprises a first portion and the trigger comprises a second portion, the first and second portions being adapted to cooperate to obstruct movement of the trigger and trigger lock when the trigger lock is pivoted to a locking position relative to the trigger.

26. The welding implement kit as recited in claim 25, wherein the trigger lock is released from the locked position by pivoting the trigger towards the base.

27. The welding implement kit as recited in claim 26, comprising a spring adapted to pivot the trigger lock toward an unlocked position when the trigger is pivoted towards the base.

28. The welding implement kit as recited in claim 22, comprising a plurality of handle pieces adapted to secure the base therebetween when the plurality of handle pieces are secured to each other.

29. The welding implement kit as recited in claim 22, wherein the self-contained trigger and trigger locking assembly comprises an electrical circuit and a conductive connector coupled to the trigger such that the position of the trigger determines whether the conductive connector closes the electric circuit, wherein the electrical circuit is configured to connect to a corresponding electrical connector in a welding cable.

31. The method as recited in claim 26, wherein pivoting comprises using a finger to provide a force in opposition to a spring biasing the trigger lock.

32. The method as recited in claim 31, further comprising the act of unlocking the spring-biased trigger by operating the spring-biased trigger such that the locking region and the complementary region may be disengaged.

33. The method as recited in claim 32, wherein the locking region and the complementary region are disengaged by an unlocking force produced by at least one of a spring biasing the trigger lock and a force applied by an operator in the direction of the bias produced by the spring.

30. A method of operating a welding system, comprising the acts of:

activating a welding implement by operating a spring-biased trigger of a self-contained trigger and trigger locking assembly;

pivoting a spring-biased trigger lock of the self-contained trigger and trigger locking assembly such that a locking region of the trigger lock engages a complementary region of the trigger; and

releasing the spring-biased trigger, wherein resistance created by the engagement of the locking region and the complementary region maintains operation of the welding system.

34. A method of assembling the handle of a welding implement, comprising the acts of:

disposing a self-contained trigger and trigger lock within a first handle piece configured to receive the self-contained trigger and trigger lock wherein the trigger lock is pivotably coupled to a trigger; and

joining a second handle piece configured to receive the self-contained trigger and trigger lock to the first handle piece, such that the self-contained trigger and trigger lock is securely held between the first and second handle pieces.