JPH071432Y2 - Pipe joint equipment - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] This invention relates to a pipe joint device, and more specifically,
The present invention relates to a joint device for connecting pipes constituting a single-pipe scaffold for construction and building frames constituting a temporary scaffold.

[Conventional technology]

For example, as shown in FIG. 1, a building frame 1 used for constructing a temporary scaffold is formed by connecting a pair of vertical pipes 2 and 2 with a horizontal rail 3 to form a gate type or a torii type. The connection is made by a joint device.

As shown in FIGS. 1 and 5, the joint device has a step portion 5 in the middle of the joint pipe 4 fitted inside the vertical pipe 2.
Is provided, and the upper end of the vertical pipe 2 and the lower end of the joint pipe 4 in the lower building frame 1a can be rotated at a fixed angle by a pin 7 penetrating a circular elongated hole 6 provided at the lower end of the joint pipe 4. The vertical pipes 2 in the building frame 1b are freely connected to each other in the axial direction, and L-shaped engaging grooves 8 are provided on the outer peripheral surface of the upper end portion of the joint pipe 4 at the opposite positions across the axis.
Dowels 9 that engage with and disengage from the engaging groove 8 are provided on the inner peripheral surface of the lower end of the above so as to project at opposing positions.

In order to connect the upper and lower building frames 1a and 1b, the joint pipe 4 is previously attached to the upper end of the lower building frame 1a by the pin 7, and the lower end of the vertical pipe 2 in the upper building frame 1b is attached to the upper half of the joint pipe 4. Is externally fitted, and the dowel 9 is engaged with the engaging groove 8 in the vertical direction.
Mate with 8a.

In this state, the joint pipe 4 is rotated and the horizontal portion 8b of the engaging groove 8 is fitted to the dowel 9.
1a and 1b will be combined vertically.

As shown in FIG. 5, the dowel 9 in the conventional joint device has horizontal H-shaped cuts in the vertical pipe 2 in the building frame 1, and the portions on both sides surrounded by the cuts are in the vertical pipe 2.
Is bent inward, and the upper ends of both bent pieces serve as hooking edges 10 with respect to the horizontal portion 8b of the hooking groove 8.

[Problems to be solved by the device]

By the way, the dowel 9 formed by making a cut in the vertical pipe 2 and bending both sides of the vertical pipe 2 inwardly has a problem in that the three edges thereof are separated from the vertical pipe 2, so that the tensile strength is weak.

[Purpose of device]

The present invention has been made in order to solve the above problems, and an object thereof is to provide a pipe joint device having a dowel that is excellent in strength against a tensile load.

[Means for Solving the Problems]

In order to solve the above problems, the present invention provides an L-shaped engaging groove on an outer peripheral surface of an end portion of a joint pipe so that the engaging groove is opened at the end portion, and a peripheral wall of a connection pipe externally fitted to the joint pipe. In a pipe joint device provided with a dowel for engaging and disengaging with a engaging groove, the dowel is formed by plastically deforming the peripheral wall of the connection pipe so as to project to the inner surface side, and one end of the dowel along the axial direction of the connection pipe is formed. It is configured such that it is separated from the peripheral wall of the connecting pipe to form a hooking edge for the hooking groove.

[Action]

The dowel provided on the pipe is formed so as to project to the inner surface side by plastically deforming the pipe, so that the other parts except the engaging edge at the upper end are integrated with the pipe, greatly increasing the tensile strength. Can be improved. In particular, since the engaging edge of the dowel is separated from the peripheral wall of the connection pipe, it can be reliably engaged with the engaging groove of the joint pipe in the pull-out direction, and a strong engaged state can be obtained.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4 of the accompanying drawings.

The basic structure of the joint device is as shown in FIG. 1, and the most important point of the present invention is the structure of the dowel 9a provided in the vertical pipe 2.

That is, as shown in FIG. 2 and FIG. 3, the dowel 9a provided on the vertical pipe 2 presses the peripheral wall of the vertical pipe 2 from the outer surface side and plastically deforms this pressed portion to cause the inner surface side of the vertical pipe 2 to be deformed. It is formed by making it protrude.

The dowel 9a is sized to fit in the engaging groove 8, and only the upper end portion thereof is separated from the peripheral wall of the vertical pipe 2 by the notch and serves as an engaging edge 10a with respect to the engaging groove 8.

The dowel 9a may have various patterns as illustrated in each of FIGS.
10a is not only a straight line but also an arcuate bulge upward (4th
(Fig. B), downward recessed arc (Fig. 4C), upward protrusion (Fig. 4D), serrated (Fig. 4E), arrow-shaped (Fig. 4F), a continuous waveform (FIG. 4G), and the like.

The joint device of this invention has the above-mentioned structure,
The vertical pipe 2 of the upper building frame 1b is externally fitted to the joint pipe 4, and the joint pipe 4 is rotated while the dowel 9a is fitted in the vertical portion 8a of the engaging groove 8 so that the engaging groove 8 is horizontal. By fitting the portion 8b to the dowel 9a, the upper and lower building frames 1a and 1b are joined, and the engaging edge 10a of the dowel 9a is the upper edge of the horizontal portion 8b in the direction in which the upper building frame 1b comes out. It will be in the retaining state by engaging with.

Since the dowel 9a is formed by plastically deforming the peripheral wall of the vertical pipe 2 to the inner surface side, it is excellent in strength due to integration with the peripheral wall, and the joint between the joint pipe 4 and the vertical pipe 2 has high withdrawal strength. Will be things. The joint device can be used not only for the building frame as shown in the figure but also for pipe connection of a single pipe scaffold. In this case, engaging grooves 8 are provided at both ends of the joint pipe 4, and dowels 9a are provided at the ends of the upper and lower pipes. Will be formed.

〔effect〕

As described above, according to the present invention, since the dowel that engages and disengages with the engaging groove of the joint pipe is formed by plastically deforming the peripheral wall of the pipe to the inner surface side, the dowel does not have other engaging edges except one engaging edge. The part is integrated with the pipe peripheral wall,
Due to the improved strength, the tensile strength at the time of connection is excellent, and the safety of the pipe connecting component can be improved. Also,
Since the engaging edge of the dowel is formed by being separated from the peripheral wall of the connecting pipe, the engaging portion of the engaging groove and the engaging edge of the joint pipe is at a right angle to the axis of the connecting pipe, and the tensile force acts. In this case, there is no escape at the engaging portion, and the tensile strength can be improved.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a building frame for temporary scaffolding using the joint device according to the present invention, FIG. 2 is a partially cutaway plan view of a dowel forming portion in the same as above, FIG. 4A to 4G are front views showing different patterns of dowels, and FIG. 5 is an exploded perspective view showing a conventional joint device. 1 ... Building frame, 2 ... Vertical pipe, 4 ... Joint pipe, 8 ... Engagement groove, 8a ... Vertical part, 8b ... Horizontal part, 9a ... Dowel, 10a ... Engagement edge.

Claims (1)

[Scope of utility model registration request] 1. An L-shaped engaging groove is provided on an outer peripheral surface of an end portion of a joint pipe so as to be opened at the end portion, and a dowel for engaging with and disengaging from the engaging groove is provided on a peripheral wall of a connection pipe which is fitted on the joint pipe. In the joint device of the pipe, the dowel is formed by plastically deforming the peripheral wall of the connection pipe so as to project toward the inner surface side, and one end of the connection pipe of the dowel along the axial direction is separated from the peripheral wall of the connection pipe and is engaged. A pipe joint device characterized by being a hooking edge for a groove.