Plug, method of expanding inside diameter of metal pipe or...

Details Plug, method of expanding inside diameter of metal pipe or... Plug, method of expanding inside diameter of metal pipe or...

2005-09-15

2011-12-20

Ross, Dana (Department: 3725)

Metal deforming

By use of tool acting during relative rotation between tool...

During rotation of work

C072S209000, C072S370060

Reexamination Certificate

active

08079243

ABSTRACT:
The plug is for expanding the inside diameter of the end portion of a metal pipe. Its cross section is a circle, and includes a taper portion and a parallel portion connected to the tail end of the taper portion. The diameter of the taper portion gradually increases from the head end of the taper portion to the tail end of the taper portion where the diameter is D1. The axial distance LR from the point where the diameter D2=D1×0.99 to the tail end where the diameter is D1satisfies the Expression 22≦LR/((D1−D2)/2)≦115. The taper angle on the surface where the diameter is D2is larger than or equal to the taper angle on the tail surface of the taper portion following the point where the diameter is D2. The diameter of the parallel portion is D1.

REFERENCES:
patent: 4161112 (1979-07-01), Stump
patent: 4203313 (1980-05-01), Kunzli et al.
patent: 5348095 (1994-09-01), Worrall et al.
patent: 6988387 (2006-01-01), Nakaike et al.
patent: 7013697 (2006-03-01), Barber
patent: 61-067528 (1986-04-01), None
patent: 62-24827 (1987-02-01), None
patent: 2001-113329 (2001-04-01), None

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