JPH0649754Y2 - Pipe connection equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a pipe connecting device, and more particularly to a connecting device used for connecting steel pipes constituting a temporary scaffolding pestle or a single pipe scaffold.

[Conventional technology]

The basic structure of the conventional connecting device used to connect the upper and lower pipes constituting the temporary scaffold will be described with reference to FIG. 1, and is supported on the intermediate portion of the outer peripheral surface of the joint 1 using a steel pipe. The stepped portion 2 is provided around the joint 1, and the engaging notches 3 that bend in the radial direction on the way from the end of the joint 1 toward the axial direction are provided at opposing positions sandwiching the shaft center at both ends of the joint 1.
A pair of engaging dowels 5 and 5 are provided on the inner surface side so as to project at opposing positions sandwiching the axial center of the connection pipe 4 which is fitted onto the joint 1.

To connect the joint 1 and the connection pipe 4, the connection pipe 4 is externally fitted and inserted into the joint 1, the engagement dowel 5 is inserted into the vertical portion 3a of the engagement notch 3, and the connection pipe 4 or the joint 1 is rotated to be engaged. The dowel 5 may be fitted in the horizontal portion 3b of the engaging notch 3, and the tensile load of the connecting pipe 4 and the joint 1 is supported by the engagement of the side edge 3c of the horizontal portion 3b and the engaging dowel 5. .

By the way, in the connecting device as described above, since the compressive load is supported by the contact between the end surface of the connecting pipe 4 and the supporting step portion 2 in the connected state, a sufficient supporting force can be obtained.

On the other hand, since the tensile load is supported by the engaging dowel 5 and the side edge 3c of the horizontal portion 3b, the engaging dowel 5 is particularly required to have a shape and structure with excellent tensile strength.

Therefore, in the tensile load test of the connecting device, the amount of movement of the joint 1 and the connecting pipe 4 in the axial direction is measured in a state in which a predetermined tensile load is applied. If the amount of movement is large, the tensile strength is weak. Will be rejected.

Conventionally, the dowel provided on the connection pipe has been formed by partially protruding the peripheral wall toward the inner surface in a hemispherical shape.

[Problems to be solved by the device]

For this reason, the engaging surface to the horizontal portion in the engaging notch of the dowel becomes an inner downward spherical inclined surface, and when a tensile load is applied, the engaging dowel spreads the connecting pipe by the inclined surface and escapes to the outside, As a result, there is a problem in that the amount of movement of the connecting pipe in the axial direction increases by the amount of relief of the engaging dowel, and the tensile load test fails.

The problem of this invention is to solve the above problems.
An object of the present invention is to provide a pipe connecting device in which a movement amount in the axial direction is small with respect to a tensile load and a connected state having excellent tensile strength is obtained.

[Means for Solving the Problems]

In order to solve the above problems, the present invention forms a hooking dowel by extruding a part of the peripheral wall of the connecting pipe into the connecting pipe, and a portion that bends in the radial direction in the hooking notch of the hooking dowel. The engaging surface is configured to be a flat surface that is horizontal at a right angle to the axis of the connection pipe at a portion where a part of the peripheral wall of the connection pipe is extruded into the connection pipe.

[Action]

Insert the engagement dowel of the connection pipe that is externally inserted into the joint into the vertical part of the engagement notch, rotate the connection pipe to fit the engagement dowel to the horizontal part of the engagement notch, and it will be in the connected state in the pulling direction. When a tensile force acts, the flat surface of the engaging dowel abuts the side edge of the horizontal portion, and the abutting portions of the two engage in a planar manner.

Since the engaging dowels and the side edges of the engaging notches engage in a plane,
There is no escape of the engaging dowel to the tensile load, and there is no axial movement of the connecting pipe due to the tensile load.

〔Example〕

An embodiment of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, the connecting device includes a joint 1, a connecting pipe 4 which is externally fitted to the joint 1, and a pair of engaging cutouts 3 which are provided at opposite positions sandwiching an axial center at an end of the joint 1. And the engaging dowels 5 provided at opposite positions sandwiching the axial center between the peripheral walls of the connecting pipe 4, and the horizontal portions 3b of the engaging notches 3 are bent in opposite directions.

The engaging dowel 5 is formed by pushing a part of the peripheral wall of the connection pipe 4 into an unbroken state and projecting it toward the inner surface.

The engaging dowel 5 is extruded in a substantially horseshoe shape as seen from the front as shown in FIG. 6, and as shown in FIGS. 2 and 4, a portion of the horizontal portion 3b of the engaging cutout 3 which engages with the side edge 3c is a flat portion 5a. become,
The portion of transition from the flat portion 5a to the inner circumference of the connecting pipe 4 serves as the centripetal portion 5b of the joint 1 and the connecting pipe 4.

In the illustrated case, the centripetal portion 5b is formed by a curved surface, and the radius R thereof is set to approximately half the difference between the inner diameter D of the connecting pipe 4 and the outer diameter d of the joint 1. The centripetal portion 5b may be formed by a linear inclined surface.

The width F of the flat portion 5a is set to be equal to or larger than the thickness T of the joint 1.
Is a horizontal plane perpendicular to the axis of the lunar connecting pipe 4 as shown in FIG.

As an auxiliary means for preventing the engagement dowel 5 from escaping to the outside when the tensile load is applied and deforming the cross-sectional shape of the connecting pipe 4, as shown in FIGS.
On the inner peripheral surface of, at a position perpendicular to both engaging dowels 5, joint 1
You may make it provide the dowel 6 of the height which contacts the outer peripheral surface.

The connection position of this invention is as described above, and when the joint 1 and the connection pipe 4 are connected, the engaging dowel 5 is fitted in the horizontal portion 3b of the engaging notch 3 as shown in FIG. At this time, when a tensile force acts on the connecting pipe 4, the engaging dowel 5 contacts the side edge 3c of the horizontal portion 3b, and the centripetal portion
By the action of 5b, the connecting pipe 4 and the joint 1 are coaxially coaxial with each other, and the flat portion 5a of the engaging dowel 5 abuts against the side edge 3c to transmit the vertical load of the connecting pipe 4 to the joint 1 as a vertical load.

Therefore, the engagement dowel 5 and the joint 1 engage in a plane,
It is possible to support the tensile load without causing the engagement dowel 5 to escape to the outside and without causing the connection pipe 4 to move in the axial direction.

〔effect〕

As described above, according to the present invention, since it has the above-mentioned configuration, the following effects are obtained.

(I) Since the engaging dowel of the connecting pipe is formed by extruding the peripheral wall of the connecting pipe into the connecting pipe, and the engaging dowel is provided with a flat surface, the engaging dowel and the engaging notch of the joint are in planar contact engaging. However, since the engaging dowel does not escape outward, a tensile load can be supported without axial movement of the connecting pipe, and a connection with excellent tensile strength can be obtained.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a connecting device according to the present invention, FIG. 2 is an enlarged vertical sectional view of the same, FIG. 3 is an enlarged transverse sectional view of the same, and FIG.
The drawing is an enlarged vertical cross-sectional view of the main part of FIG. 2, FIG. 5 is a cross-sectional plan view of the same, and FIG. 6 is a front view of the engaging dowel. 1 ... Joint, 3 ... Engagement notch, 3a ... Vertical part, 3b ... Horizontal part, 4 ... Connection pipe, 5 ... Engagement dowel, 5a ... Flat part, 5b ... Centering part.

Claims (1)

[Scope of utility model registration request] 1. A shaft of a connecting pipe, which is provided at a position facing each other so as to sandwich the shaft center at the end of the joint, has a hooking notch that is bent in the radial direction on the way from the end of the joint in the axial direction, and is externally fitted into the joint. In a pipe connecting device in which a hooking dowel with the hooking notch is provided at opposing positions sandwiching a core, the hooking dowel is formed by extruding a part of the peripheral wall of the connecting pipe into the connecting pipe, and the hooking notch of the hooking dowel is formed. A pipe characterized in that the engagement surface with the portion that bends in the radial direction is a flat surface that is horizontal at right angles to the axis of the connection pipe at the portion where a part of the peripheral wall of the connection pipe is extruded into the connection pipe. Connection device.