Method for reinforcing and calibrating a pipe portion

Patent metadata

Field	Value
Publication number	US-10077567-B2
Application number	US-201514873387-A
Country	US
Kind code	B2
Filing date	Oct 2, 2015
Priority date	Apr 12, 2013
Publication date	Sep 18, 2018
Grant date	Sep 18, 2018

Abstract

A method and a device for producing an outer pipe of a telescope-like support, for reasons of weight and stability, is produced from a standardized zinc-coated steel pipe having a large outer diameter and a small wall thickness. Also included is the telescope-like support and the outer pipe which is contained therein. A pipe portion of the outer pipe is expanded in the method with a punch and subsequently tapered to the original outer diameter again with a ring. A reinforcement of the pipe portion and a calibration of the outer diameter of the pipe portion are thereby achieved. An outer thread can be rolled on the pipe portion.

First claim

What is claimed is:

1. A method for reinforcing and calibrating of at least a thin-walled pipe portion of an outer pipe of a telescope-like support for the construction sector, comprises the steps of:
a) pushing a ring onto the pipe portion, whereby the inner diameter of the ring corresponds to the outer diameter of the pipe portion;
b) inserting a punch into the pipe portion, the outer diameter of the punch being greater than the inner diameter of the pipe portion thus expanding the pipe portion;
c) pulling the punch out of the pipe portion;
d) covering the expanded pipe portion with the ring, thus tapering the expanded pipe portion;
wherein step d) is performed after step c) or simultaneously with step c); and
e) rolling a thread in the form of a trapezoidal thread having a flank angle of less than 15° at least partially on the pipe portion.

2. The method according to claim 1 , wherein the punch and the ring are guided with fixed spacing with respect to each other.

3. The method according to claim 1 , wherein the outer pipe in the form of a zinc-coated steel pipe is used to carry out the method.

4. The method according to claim 1 , wherein the outer pipe having an outer diameter of more than 60 mm and a wall thickness of less than 3 mm is used to carry out the method.

5. The method according to claim 1 , wherein the outer pipe having an outer diameter of more than 60 mm and a wall thickness of less than 2.7 mm is used to carry out the method.

6. A method for reinforcing and calibrating of at least a thin-walled pipe portion of an outer pipe of a telescope-like support for the construction sector, comprises the steps of:
a) pushing a ring onto the pipe portion, whereby the inner diameter of the ring corresponds to the outer diameter of the pipe portion;
b) inserting a punch into the pipe portion, the outer diameter of the punch being greater than the inner diameter of the pipe portion thus expanding the pipe portion;
c) pulling the punch out of the pipe portion;
d) covering the expanded pipe portion with the ring, thus tapering the expanded pipe portion;
wherein step d) is performed after step c) or simultaneously with step c); and
e) rolling a thread in the form of a trapezoidal thread having a flank angle of less than 10° at least partially on the pipe portion.

7. The method according to claim 6 , wherein the punch and the ring are guided with fixed spacing with respect to each other.

8. The method according to claim 6 , wherein the outer pipe in the form of a zinc-coated steel pipe is used to carry out the method.

9. The method according to claim 6 , wherein the outer pipe having an outer diameter of more than 60 mm and a wall thickness of less than 3 mm is used to carry out the method.

10. The method according to claim 6 , wherein the outer pipe having an outer diameter of more than 60 mm and a wall thickness of less than 2.7 mm is used to carry out the method.

11. A method for reinforcing and calibrating of at least a thin-walled pipe portion of an outer pipe of a telescope-like support for the construction sector, comprises the steps of:
a) inserting a punch into the pipe portion, the outer diameter of the punch being greater than the inner diameter of the pipe portion thus expanding the pipe portion;
b) pulling the punch out of the pipe portion;
c) covering the expanded pipe portion with a ring thus tapering the expanded pipe portion, where the inner diameter of the ring corresponds to the outer diameter of the pipe portion before it was expanded;
wherein step c) is performed after step b) or simultaneously with step b); and
d) rolling a thread in the form of a trapezoidal thread having a flank angle of less than 15° at least partially on the pipe portion.

Assignees

• Peri Gmbh

Inventors

• Andree Juergen
• Specht Rudolf

Classifications

• B21H3/02

  external screw-threads {; Making dies for thread rolling} · CPC title

• B21D3/16 Primary

  of specific articles made from metal rods, tubes, or profiles, e.g. crankshafts, by specially adapted methods or means · CPC title

• E04G25/065 Primary

  by a threaded nut · CPC title

• E04G25/061

  by pins · CPC title

• E04G17/14

  Bracing or strutting arrangements for formwalls; Devices for aligning forms (E04G25/00 takes precedence; {connecting and aligning E04G17/04}) · CPC title