AP584A

AP584A - Pipe end.

Info

Publication number: AP584A
Application number: APAP/P/1995/000713A
Authority: AP
Inventors: Ronald Robert Carew
Original assignee: Brokrew Pty Ltd
Priority date: 1994-01-19
Filing date: 1995-01-18
Publication date: 1997-04-23
Also published as: AP9500713A0; ZA95245B

Abstract

The invention provides

Description

PIPE END

INTRODUCTION

THIS INVENTION relates to a pipe end for use in coupling pipes together.

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Γ BACKGROUND TO THE INVENTION

In the ventilation industry, and particularly with ventilation in underground mines, many kilometres ^r .'f pini ng are reguirr'd. One of the typin', of p j pp used is a sheet rn-r.il pipe having a rounded end

AP/P/ 9 5 / 0 0 7 1 3 ί tI nge, known

AP. Ο Ο 5 θ 4 ί large, known ns η beaded end pipe in the art.

This pipe is light and relatively easy to manoeuvre, with a simple coupling.

However when a mine stope size is reduced, large j diameter and long lengths of pipe cannot be used as they are too difficult to manoeuvre underground.

Additionally the conventional clamp type coupling is difficult to install, and in many cases these problems mean that the stopes are not provided with proper ventilation piping. This results in hazardous working circumstances.

The difficulty with providing a beaded end on a small diameter pipe, is that the metal fatigue involved in forming the round sheet metal around an annular ring to form the bead, is too great. The metal splits around the curve, before the fold around the ring has properly captured the ring and so formed the bead.

OBJECT OF THE INVENTION

AP/P.' 9 5 / 0 0 7 1 3 ι n eb'ieef ip thi:' i nve η P i - ,n t- ₍, on >V ide ,1 pipe

/end and

AP 00584 end and a method of forming it, which will obviate the abovementioned difficulties.

SUMMARY OF THE INVENTION

In accordance with this invention there is provided a sheet metal pipe end having an external generally circumferential rib spaced from the pipe end, a ring located around the pipe tc abut the end side r

of the rib, the sheet metal from the ring to the end of the pipe being formed over and around the ring to capture the ring against the rib.

There is provided for the rib to be formed from the pipe metal, and to be an outwardly roller-deformed, rib with a generally curved cross section.

The invention extends to a method of producing a steet metal pipe end comprising forming an external generally circumferential rib spaced from the end

of a sheet metal	pipe, locating a ring	around the
pipe to abut the	end side of the rib,	and	forming
the .«-.beet metal ί	rum the rim, to the	em 1	·' the
: , me outwardly and	over the ring towards	the	rib.---

AP/P/ 9 5 / 0 0 7 1 3 /Preferably the

Preferably the forming process for the pipe end takes place in two steps, the first being the roller forming of the sheet metal from the ring to the edge of the pipe to a substantially radially outwardly extending flange abutting the ring, and the second step being the final forming of the sheet metal around and over the ring towards the rib.

BRIEF DESCRIPTION OF THE DRAWINGS

AP. Ο Ο 5 8 4

Λ preferred embodiment of the invention is described below by way of example only, and with reference to the accompanying drawings, in which :

Figure 1

U cr is a part-sectioned side view of a pipe end according to the · . C invention; and, *>.

figures 2 and 3 show steps in the pipe end of

idetailed .pescr iption

AP . 0 9 5 8 4 r

DETAILED DESCRIPTION OF THE DRAWING

Referring to Figure 1, a sheet metal pipe (1) has an end (2) formed in accordance this embodiment of the invention. The pipe end has an outwardly formed circumferential rib (3) located spaced apart from the pipe end (4), with round metal bar formed in a ring (5) and located over the pipe to abut the end side of the rib (3) . The sheet metal from the ring (5) to the end (4) of the pipe thereafter is formed outwardly and over the ring (5) as indicated by numeral (6), to capture the ring against the rib (3) .

The formation of this process is illustrated further in Figures 2 and 3. The circumferential rib (3) is formed first as indicated by numeral (10) (Figure 2) by a rolling process known in the art. per se. Thereafter, with a backing rol ler supporting the exterior cf the pipe, a roller in a first forming step deforms the sheet metal from the ring to the end of the pipe (11) in the direction ' arrow ( 1 ?) , to the position (in shown in .lar.lwd 1 i nes. The position /1 ) shows the sheet metal £1/00/56 Zd/dV /from the i rni;; the ring to the end oi the pipe (11) bent outwardly to form a radial flange around the ring

AP.00584 (4)

The second and last step, shown in Figure 3, shows he portion (13) rolled over in the direction oi arrow (14) to the position in dashed lines indicated by numeral (15). In this position the sheet metal can be formed over at least half of the cross section of the ring (14).

The advantage provided by the invention is that the ring can be captured with a minimal forming of the sheet metal over the ring (5) since the rib (3) provides an abutting support structure for the ring. It is not required to form the sheet metal over the ring sufficiently to hold the ring with no other support around it.---—----

Claims

/CLAIMS

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- 8 CLAIMS

WHAT IS CLAIMED IS:

1. A sheet metal pipe end having an externa) generally circumferential rib spaced from the pipe end, a ring located around the pipe to abut the end side of the rib, the sheet metal from the ring to the end of the pipe being formed over and around the ring to capture the ring against the rib.

2 . A pipe end as claimed in claim 1 in which the rib is formed from the pipe metal. if) 3., A pipe end as claimed in claim 2 in which the

AP/P/ 9 5 / 0 0 7 1 3 rib is outwardly roller-deformed with a generally curved cross section.

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4. Λ method of producing a sheet metal pipe fvid comprising forming an external generally circumferential rib spaced from the end of a sheet metal pipe, locating a ring around the pipe to abut the end side nf pin fib, and /forming the

AP.00584 forming the sheet metal from the ring to the end of the pipe outwardly and over the ring towards the rib.
5. A method of producing a pipe end as claimed in claim 4 in which the forming process for the sheet metal from the ring to the edge of the pipe takes place in two steps, the first being the roller forming of the sheet metal to a substantially radially outwardly extending '(ί flange abutting the ring, and the second step being the final forming of the sheet metal around and over the ring towards the rib.