Patent · US Expired

Pipe fitting for drilling

US5975117A · kind A · utility

7Cited by

18References

17Claims

0Family size

Assignee

Friatec Aktiengesellschaft · DE

Inventors

Ruediger SCHWEITZER · Weinheim, DE
Wolfgang Sichler · Mannheim, DE
Steffen Kretz · Mannheim, DE

Key dates

Filing date	Nov 26, 1997
Grant date	Nov 2, 1999
Priority date	—
Expiry date	Nov 26, 2017

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T408/561
WIPO fieldMechanical elements
WIPO sectorMechanical engineering

Abstract

A pipe tapping valve which can be connected, for example by welding, with a pipe which is to be tapped, and which includes a support stub (4) in which a drill bit (26) is disposed for axial movement, and with which a branch nipple (12) is connected. The pipe tapping valve is configured so that the drilling of the tube can be safely performed with little difficulty, while a seal satisfying the requirements of the particular application is provided both during the drilling and after the drilling has ended. The support stub (4) has a substantially smooth cylindrical inside surface; the drill bit (26) contains at its upper free end an expansion (30) or a sealing ring (54) in contact with the inner surface (34) of the support stub (4), and the drill bit (26) is axially movable by means of a drilling tool (36) attachable to the support stub (4).

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.