Welding wire feeder and motor therefor

Details Welding wire feeder and motor therefor Welding wire feeder and motor therefor

2007-01-09

2007-01-09

Lam, Thanh (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S241000

Reexamination Certificate

active

10687170

ABSTRACT:
A wire feeder for an electric arc welder comprising a set of feed rolls driven by a DC motor with a commutator, first and second opposite polarity leads receiving power to drive the motor, and having a first brush at a given position on the commutator and connected to the first lead, a second brush circumferentially spaced from the first brush a first annular distance around the commutator and connectable to the second lead to cause the motor to rotate at a first speed to drive the rolls at a first speed, a third brush circumferentially spaced from the first brush a second annular distance around the commutator and connectable to the second lead to cause the motor to rotate at a second speed to drive the rolls at a second speed, and a switching circuit with an operative condition to connect the second lead to a selected one of the second and third brushes.

REFERENCES:
patent: 1508712 (1924-09-01), Noble
patent: 3586935 (1971-06-01), Lundelius et al.
patent: 4827897 (1989-05-01), Yamada et al.
patent: 6066833 (2000-05-01), Rigdon
patent: 6427894 (2002-08-01), Blank

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