Electric heating – Metal heating – For bonding with pressure
Reexamination Certificate
1999-09-09
2001-01-16
Shaw, Clifford C. (Department: 1725)
Electric heating
Metal heating
For bonding with pressure
Reexamination Certificate
active
06175094
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a new and improved stud welding gun which is used to weld studs to a base member.
Stud welding guns have previously been utilized to weld studs to a base member. The studs are welded to the base member by establishing an electrical arc between the stud and base member. A known stud welding gun with a manually movable stud feed member or plunger is disclosed in U.S. Pat. No. 3,679,860.
During operation of the known stud welding gun, studs are fed one at a time to a location immediately ahead of the stud feed member. The stud feed member is then manually moved through a relatively long feed stroke to feed a stud to a chuck. The chuck holds the stud during welding of the stud to a base member. Other known stud welding guns are disclosed in U.S. Pat. Nos. 2,402,256 and 2,816,210.
SUMMARY OF THE INVENTION
An improved stud welding gun is used to weld studs to a base member. The stud welding gun includes a barrel having a passage in which a plurality of studs are disposed in an array. A stud holder is disposed at the outer end portion of the barrel and holds a stud during welding of the stud to a base member. A stud feed member movable relative to the barrel to move a leading stud in the array of studs into the stud holder. The stud feed member has a leading end portion which applies force against a trailing stud in the array of studs to move the array of studs along the passage in the barrel toward the stud holder.
REFERENCES:
patent: 2402256 (1946-06-01), Nelson
patent: 2816210 (1957-12-01), Mowry
patent: 3303318 (1967-02-01), Spisak
patent: 3371184 (1968-02-01), Napoli
patent: 3679860 (1972-07-01), Spisak
patent: 5067632 (1991-11-01), Aubry
patent: 5403988 (1995-04-01), Kawada et al.
patent: 5824987 (1998-10-01), Volk
patent: 6025569 (2000-02-01), McCardle et al.
Howard & Howard
Nelson Stud Welding, Inc.
Shaw Clifford C.
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