Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Threaded fastener locked to a discreet structure – Design of fastener or substructure restricts rotation
Reexamination Certificate
1999-03-17
2001-01-23
Saether, Flemming (Department: 3627)
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Threaded fastener locked to a discreet structure
Design of fastener or substructure restricts rotation
C411S389000, C411S455000, C052S506050, C052S544000, C052S549000
Reexamination Certificate
active
06176662
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a weld stud for use with a press fitted cap and more specifically to a stud having one end portion which is welded to a base and a second end portion which is engaged by the cap.
A known apparatus for installing insulation on a metal ceiling or wall of a ship includes a stud. The known stud has a relatively large diameter base which is welded to the ceiling or wall of the ship. A generally cylindrical pin extends axially outward from the base and is engaged by a cap to hold the insulation in place. The pin has a smaller diameter than the base.
When this known stud is used to install insulation on a wall or ceiling of a ship, care must be taken to be certain that the base end of the stud is welded to the ceiling or wall of the ship. This means that the stud must be properly oriented when it is positioned in a stud welding gun or similar device. In addition, the large diameter base makes loading of the stud in a magazine of the stud welding gun for automatic feeding difficult since a stack of the studs in the magazine will tend to assume a curved configuration in a direction toward the relatively small diameter unwelded ends of the studs. Thus, the large diameter base ends of the studs will be disposed on the outside of the curve and the small diameter pin ends of the studs will be disposed in engagement with each other on the inside of the curve as shown in FIG.
5
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SUMMARY OF THE INVENTION
The present invention provides a new and improved welding stud for use with a press fitted cap. The welding stud includes a generally cylindrical body. A first series of annular rings is disposed on the first end portion of the cylindrical body of the stud. A second series of annular rings is disposed on the second end portion the cylindrical body. The second series of annular rings are a mirror image of the first series of annular rings to enable the cap to engage either the first or the second series of annular rings.
Both ends of a weld stud constructed in accordance with the present invention are identical. Therefore, either end of the weld stud can be welded. This eliminates the need to identify and orient the weld end when the studs of the present invention are loaded either automatically or manually into a stud welding gun.
REFERENCES:
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patent: 1948889 (1934-02-01), Simon
patent: 2421184 (1947-05-01), Candy
patent: 2451190 (1948-10-01), Anderson
patent: 2474531 (1949-06-01), Keir et al.
patent: 4429209 (1984-01-01), Hinden
patent: 4528783 (1985-07-01), Muir
patent: 5265998 (1993-11-01), Kluser
patent: 5579986 (1996-12-01), Sherry
patent: 5618491 (1997-04-01), Kurup et al.
patent: 5820323 (1998-10-01), Barandun
patent: 5842319 (1998-12-01), Ravetto
patent: 5947669 (1999-09-01), Schaty
An article entitled “N3P Navy Type Annular Ring,” date unknown but prior to Oct. 1, 1998.
Champney Clark B.
Easterday William C.
Howard & Howard
Nelson Stud Welding, Inc.
Saether Flemming
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