JPS6282104U

JPS6282104U -

Info

Publication number: JPS6282104U
Application number: JP17345185U
Authority: JP
Priority date: 1985-11-11
Filing date: 1985-11-11
Publication date: 1987-05-26

Description

[Brief explanation of the drawing]

第１図はこの考案の一実施例におけるマンドレ
ル先端部分の縦断面図、第２図は同上要部の拡大
縦断面図、第３図は第２図―線上の縦断面図
である。１……先端金物、２……マンドレルバー、３…
…プラグ、４……係合突部、５……取着孔、６…
…係止ピン、７，９……水管、８……環状凸部、
１０―１，１０―２……フランジ、１１……内孔
、１２……コイルばね、１３……軸受ケース、１
４……ころがり軸受、１５……耐熱油、１６……
ピン孔、１７……係合凹部。 FIG. 1 is a longitudinal cross-sectional view of the tip of a mandrel in an embodiment of the invention, FIG. 2 is an enlarged vertical cross-sectional view of the main part of the same, and FIG. 3 is a vertical cross-sectional view taken along the line of FIG. 2. 1... Tip hardware, 2... Mandrel bar, 3...
...Plug, 4...Engaging protrusion, 5...Mounting hole, 6...
... Locking pin, 7, 9 ... Water tube, 8 ... Annular convex part,
10-1, 10-2...Flange, 11...Inner hole, 12...Coil spring, 13...Bearing case, 1
4...Rolling bearing, 15...Heat-resistant oil, 16...
Pin hole, 17...engaging recess.

Claims

[Scope of utility model registration request]

A locking pin whose tip can protrude outward is inserted into a plurality of pin holes arranged radially in the plug fitting part of the cylindrical metal tip attached to the tip of the mandrel bar so that it can move forward and backward. An annular convex portion formed at the distal end of the water tube inserted so as to be movable in the tube axis direction and having an inclined surface on the inside abuts against and faces the inner end of the locking pin, and the other end of the water tube is fitted with a coil spring. A plug attaching/detaching device for a pipe-making mandrel, which is flange-jointed to a water tube inserted into a mandrel bar by pressing, and configured so that the locking pin is locked in an engagement recess formed in an attachment hole of the plug.