Portable welding unit

• US 6,225,596 B1
• Filed: 03/20/1996
• Issued: 05/01/2001
• Est. Priority Date: 03/20/1996
• Status: Expired due to Term

• Current Assignee: Lincoln Electric Holdings Incorporated
• Original Assignee: Century Manufacturing Co. (Pentair Plc (Ireland))
• Inventors: West, John C., Chandler, Thomas D.
• Primary Examiner(s): Shaw, Clifford C.
• Application Number:
  US08/618,968
• Time in Patent Office: 1,868 Days
• Field of Search: 219/130.1, 219/125.1, 219/130.31, 219/130.32, 219/130.33, 219/133, 219/134, 219/136, 219/137.2, 219/137.71, 219/137 PS, 219/98, 429/90, 429/100
• US Class Current: 219/130.1
• CPC Class Codes: B23K 9/1056 by using digital means B23K9/1068 takes precedence
• CPC Class Codes: B23K 9/1333 Dereeling means

Abstract

A portable welding unit comprising a housing. The housing contains a first battery and a second battery connected in series. Each of the batteries is a sealed, non-spillable battery. Each battery has a positive terminal and a negative terminal. The welding unit has a first clamp electrically connected to the positive terminal of the first sealed, non-spillable battery. The first clamp extends outside the housing and is adapted to be connected to a ground of an object to be welded. A welding gun is electrically connected to the negative terminal of the second sealed, non-spillable battery. The welding gun extends outside the housing. A wire feed mechanism is located in the housing and is connected to the battery for extending wire through the welding gun. A spool of consumable electrode wire is rotatably connected to the housing. This wire is supplied to the welding gun via the wire feed mechanism.

In operation, the user connects the first clamp to ground. Next, the user enables the unit so that power is supplied from the batteries contained in the housing. Once the unit is powered up and the gun trigger is activated, the wire electrode is supplied through the welding gun by the wire feed mechanism. The user may then begin welding.

Claims

1. A portable welding unit, comprising:

(a) a housing;

(b) at least one sealed, non-spillable suspended-electrolyte battery located in the housing, the at least one battery having a positive terminal and a negative terminal, wherein the at least one battery can provide sufficient current to power a portable welder;

(c) a ground clamp electrically connected to one of the positive and negative terminals of the at least one battery, the ground clamp extending outside the housing and adapted to be connected to a ground of an object to be welded;

(d) a welding gun electrically connected to the other of the one of the positive and negative terminals of the at least one battery, the welding gun extending outside the housing; and

(e) a wire feed mechanism located in the housing and connected to the battery for feeding wire through the welding gun.

2. The welding unit of claim 1, wherein first and a second sealed, non-spillable, suspended-electrolyte batteries, each having a positive and a negative terminal, are connected in series and located in the housing, with the ground clamp connected to the positive terminal of the first battery and the welding gun electrically connected to the negative terminal of the second battery.

3. The welding unit of claim 2, further comprising a recharging connection for recharging the first and second batteries.

4. The welding unit of claim 3, wherein the recharging connection is configured for charging at twelve volts.

5. The welding unit of claim 3, wherein the recharging connection is configured for charging at twenty-four volts.

6. The welding unit of claim 1, further comprising a battery monitoring circuit electrically connected to the at least one battery for determining the condition of the at least one battery.

7. The welding unit of claim 6, further comprising an output display connected to the battery monitoring circuit to visually indicate the condition of the battery.

8. The welding unit of claim 7, further comprising a tester button for enabling the user to determine the condition of the at least one battery, the tester button is located in the housing and is electrically connected to the battery monitoring circuit.

9. The welding unit of claim 6, wherein the at least one battery comprises a first battery and a second battery, and wherein the battery monitoring circuit is connected across the second battery.

10. The welding unit of claim 6, wherein the at least one battery comprises a first battery and a second battery, and wherein the battery monitoring circuit is connected across the first and second batteries.

11. The welding unit of claim 1, wherein the wire feed mechanism comprises

(a) a drive motor;

(b) grooved rollers powered by the drive motor and adapted to receive electrode wire; and

(c) a drive motor control circuit connected to the at least one battery and the drive motor.

12. The welding unit of claim 11 wherein the drive motor has a gear reduction mechanism.

13. The welding unit of claim 12, wherein the drive motor is a variable speed motor.

14. The welding unit of claim 13, wherein the grooved roller has a wire tension adjustment.

15. The welding unit of claim 1, wherein the ground clamp is connected to the positive terminal of the at least one battery and the welding gun is connected to the negative terminal of the at least one battery, whereby the drive mechanism utilizes flux electrode wire.

16. The welding unit of claim 1, wherein the ground clamp is connected to the negative terminal of the at least one battery and the welding gun is connected to the positive terminal of the at least one battery, whereby the drive mechanism utilizes solid electrode wire.

17. A compact portable welding unit, comprising:

(a) a housing having a width not greater than seven (7) inches, a length not greater than fifteen (15) inches, and a height not greater than fifteen and one-half (15½

) inches;

(b) at least one sealed, non-spillable battery, the battery having a positive and a negative terminal, the battery located in the housing, wherein the at least one battery can provide sufficient current to power a portable welder;

(c) a ground clamp electrically connected to one of the positive and negative terminals of the battery, the first clamp extending outside the housing and adapted to be connected to a ground of an object to be welded;

(d) a welding gun electrically connected to the other one of the positive and negative terminals of the battery, the welding gun extending outside the housing; and

(e) a wire feed mechanism located in the housing and connected to the battery for feeding wire through the welding gun.

18. The welding unit of claim 17, wherein the width of the housing is between three and seven inches, inclusive.

19. The welding unit of claim 17, wherein the length of the housing is between six and fifteen inches, inclusive.

20. The welding unit of claim 17, wherein the height of the housing is between nine and fifteen inches, inclusive.

21. The welding unit of claim 17, wherein the unit comprises a first and a second sealed, non-spillable batteries connected in series, each battery having a positive and a negative terminal, the first and second batteries located in the housing, with the first clamp connected to the positive terminal of the first battery and the welding gun connected to the negative terminal of the second battery.

22. The welding unit of claim 17, further comprising a recharging connection for recharging the first and second batteries.

23. The welding unit of claim 20, wherein the recharging connection is configured for charging at twelve volts.

24. The welding unit of claim 20, wherein the recharging connection configured for charging at twenty-four volts.

25. The welding unit of claim 17, further comprising a battery monitoring circuit electrically connected to the at least one battery for determining the condition of the at least one battery.

26. The welding unit of claim 25, further comprising an output display connected to the battery monitoring circuit to visually indicate the condition of the battery.

27. The welding unit of claim 25, wherein the at least one battery comprises a first battery and a second battery, and wherein the battery monitoring circuit is connected across the second battery.

28. The welding unit of claim 25, wherein the at least one battery comprises a first battery and a second battery, and wherein the battery monitoring circuit is connected across the first and second batteries.

29. The welding unit of claim 17, wherein the at least one battery comprises a first battery and a second battery, and wherein each of the first and second batteries have the following dimensions:

not greater than seven inches (7 inches) in height, not greater than seven and one-half inches (7½

inches) in length, and not greater than three inches in width (3 inches).

30. The welding unit of claim 29, wherein each of the first and second batteries may output up to seventeen (17) ampere hours.

31. The welding unit of claim 29, wherein each of the first and second batteries have the following dimensions:

approximately 6.57 in height, approximately 7.13 inches in length, and approximately 3 inches in width.

32. The welding unit of claim 17, wherein the ground clamp is connected to the positive terminal of the at least one battery and the welding gun is connected to the negative terminal of the at least one battery, whereby the drive mechanism utilizes flux electrode wire.

33. The welding unit of claim 17, wherein the ground clamp is connected to the negative terminal of the at least one battery and the welding gun is connected to the positive terminal of the at least one battery, whereby the drive mechanism utilizes solid electrode wire.

34. A portable welding unit, comprising:

(a) a housing;

(b) at least one sealed, non-spillable, lead-calcium, rechargeable battery located in the housing, the at least one battery having a positive terminal and a negative terminal, wherein the at least one battery can provide sufficient current to power a portable welder;

(c) a ground clamp electrically connected to one of the positive and negative terminals of the at least one battery, the ground clamp extending outside the housing and adapted to be connected to a ground of an object to be welded;

(d) a welding gun electrically connected to the other of the one of the positive and negative terminals of the at least one battery, the welding gun extending outside the housing; and

(e) a wire feed mechanism located in the housing and connected to the battery for feeding wire through the welding gun.