Pipe joints or couplings – Socket – With separable fastener
Reexamination Certificate
2005-11-23
2009-02-24
Dunwoody, Aaron M (Department: 3679)
Pipe joints or couplings
Socket
With separable fastener
C285S007000, C285S303000, C285S317000
Reexamination Certificate
active
07494161
ABSTRACT:
A coming off preventing device is provided for a joining part of an air supply and exhaust pipe which joins two pipes by inserting an entry of one air supply and exhaust pipe into a socket of another air supply and exhaust pipe. A cut out window is provided at the socket side, and a metal stopper is equipped on the outer side of the cut out window, wherein the metal stopper has a lock unit which includes a push part on an upper surface of one end, a rectangular shaped lock part on a lower surface of another end and a bearing part on an upper surface of a center part. Further, the lock unit has a lower surface to which one end of a plate spring is welded wherein the plate spring is bent to have an obtuse angle. A joint cover covers said lock unit and fixes said lock unit axially. Further to the entry side, a circumferential groove is engraved to the opposite direction to the entry with a gradient, and an entry stopper. The groove stops coming off by fitting of or receiving the rectangular shaped lock part of said lock unit. By only inserting an entry of one pipe into a socket of the other pipe, the lock unit is fixed into the circumferential groove and a coming off preventing function is generated. Further, an air supply and exhaust pipe can be easily pulled off from another air supply and exhaust pipe by pushing a push part with a finger.
REFERENCES:
patent: 2254611 (1941-09-01), Lofgren
patent: 4641859 (1987-02-01), Walters
patent: 6341804 (2002-01-01), Ito et al.
patent: 6832784 (2004-12-01), Chen
patent: H10-253038 (1998-09-01), None
patent: 2000-146066 (2000-05-01), None
patent: 2000-304182 (2000-11-01), None
Hatakeyama Takao
Kanai Ichiyo
Dunwoody Aaron M
Flynn ,Thiel, Boutell & Tanis, P.C.
Japan Pipe System Co., Ltd.
Kee Fannie
LandOfFree
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