JP2004116070A - Pipe joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe joint securing safety in demolition work such as a temporary scaffold, shortening a working period and enabling the reduction of a cost by facilitating assembling work by making use of the pipe joint with a simplified constitution having an interlocking (lock) mechanism capable of being used for an existing popular pipe as it is to easily carry out the demolition work alone, and at the same time, preventing the pipe joint from being slipped down. <P>SOLUTION: The joint is laid between both connecting ends of pipes 4b and 4c provided with locking bars by passing through diameters in the vicinity of an opening end. In the pipe joint 1 symmetrically formed with a pair of fixing grooves for inserting and locking the fixing bars 5 of the pipes on the outer circumferential surfaces of insertion sections toward a stopper 1a from the opening end in both insertion sections, the fixing groove 3 in one insertion section is formed in an approximately L-shape, and at the same time, the fixing groove 3b in the other insertion section is formed in an approximately inverted T-shape. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a pipe joint for connecting pipes used for a temporary scaffold, a pipe shelf, and the like.
[0002]
[Prior art]
Conventionally, a pipe used for a temporary scaffold or the like is formed by fixing a locking rod penetrating a diameter near an open end, and a joint connecting the pipes has a short diameter having an outer diameter corresponding to the inner diameter of the connecting pipe. A tube provided with a stopper portion at the center thereof, which is a large-diameter portion having substantially the same outer diameter as the pipe, has been used.
In order to prevent the connection between the pipe and the pipe joint from being disconnected, the open ends of both insertion portions 2b and 2c of the pipe joint 2 are connected to the ends of the pipes 4b and 4c as shown in FIG. A substantially L-shaped locking groove 3 for locking the locking rods 5 and 5 provided in the vicinity is symmetrically provided at positions opposed to the outer peripheral phases of both the insertion portions 2b and 2c of the pipe joint. After inserting the engaging rod of the pipe engaged with the stop groove, the pipe joint is rotated and locked.
[0003]
Such pipe joints and pipe locks have a simple structure, and in the work of assembling and dismantling, it is only necessary to rotate the pipe or the pipe joint to the lock position or the release position. Is what it is.
[0004]
On the other hand, a spring is provided in the pipe joint, which causes the lock piece to protrude from the outer surface of the insertion part, locks it to the connected pipe, and releases the lock by pressing the release button that cooperates with the lock piece when dismantling. The technique to be performed is disclosed in JP-A-9-242331 and JP-A-10-82171.
This technique is more secure than the pipe joint having the L-shaped locking groove because it is difficult to release the locked state by free rotation of the pipe joint or the pipe itself. However, problems of manufacturing cost, increase of the weight of the pipe joint itself, and malfunction due to breakage or adhesion of a spraying material due to the complicated structure were likely to cause problems. Furthermore, the above-mentioned widely used pipe having a locking rod inside the end cannot be used as it is, and a dedicated pipe has to be prepared.
[0005]
Therefore, a pipe joint which can be used for a pipe having an existing locking rod and has improved stability has been developed and is disclosed in Japanese Patent Application Laid-Open No. H11-2217. This has an L-shaped locking groove, and by rotating a bolt provided in a stopper portion, a block body that presses against the inner surface of the pipe is moved up and down to fix or release the pipe, thereby improving stability during use. It is enhanced.
However, such pipe joints require time and effort to turn the bolts during assembly and disassembly, requiring time and labor at sites where a large number of pipes are used.
[0006]
A common problem in each of the above techniques is a pipe joint falling off during dismantling. For example, in the case of a pipe joint having the L-shaped locking groove, the pipe is rotated or the pipe joint itself is rotated to release the relationship between the L-shaped locking groove and the locking rod of the pipe. Is pulled out, but the relationship with the pipe joint in the pipe opposite to the pipe to be pulled out is also released, and when the pipe joint is pulled by the pipe to be pulled out, it often falls off.
This also applies to other technologies.After the release state, for example, if paint or the like is interposed between the pipe to be extracted and the pipe joint, the pipe joint is pulled by the extracted pipe and falls off as described above. May be.
[0007]
Such dropout accidents often cause fatal damage to workers and passersby at high places such as building construction sites, for example, and are serious problems in safety management.
Therefore, when disassembling a scaffold or the like using the pipe joint and the pipe, two people usually work together, and a person who grasps and releases the pipe joint and a person who pulls out the pipe work together. Accordingly, the dismantling work requires manpower and time, so that the working period is prolonged and the cost is easily increased.
[0008]
[Problems to be solved by the invention]
SUMMARY OF THE INVENTION The present invention is directed to solving the above-described problems, and provides a temporary scaffold by using a pipe joint having a simple structure having a locking mechanism that can be used as it is on a widely used existing pipe. Assembling work is facilitated, and the temporary scaffolding can be easily dismantled by one person, and the number of pipe joints falling off during dismantling work is reduced, ensuring safety and shortening the work for dismantling temporary scaffolds.・ The purpose is to realize cost reduction.
[0009]
[Means for Solving the Problems]
Claim 1 is a pipe joint interposed between both connecting ends of pipes connected to each other, the both ends of which are short pipes having an outer diameter that can be inserted into the connecting ends of the connected pipes, A stopper portion is provided on the outer periphery of the central portion, the stopper portion being in contact with the connecting end of the pipe, and a locking rod provided at the both ends of the connecting end portion of each of the pipes so as to penetrate the diameter is provided. A locking groove for stopping is formed, and a locking groove formed on one insertion portion is substantially L-shaped provided symmetrically on an outer peripheral surface of the insertion portion from the opening end of the insertion portion toward the stopper portion. A pipe joint, wherein a locking groove formed in the other insertion portion is a substantially inverted T-shape provided symmetrically on an outer peripheral surface of the insertion portion from an opening end of the insertion portion toward the stopper portion. In addition, in the second aspect, a predetermined mark is provided in the vicinity of a boundary between the stopper and one of the insertion portions, and the substantially L-shaped locking groove or the substantially inverted T-shaped locking is provided after connection. A pipe joint that allows the user to check the pipe into which the grooved insertion section has been inserted. In addition, the insertion portion provided with the substantially inverted T-shaped locking groove according to the positional relationship between the mark and the mark indicating the position of the locking rod on the outer periphery of the connected pipe. The pipe joint is located at the position indicating the release position.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, embodiments of the present invention will be described in detail with reference to the drawings.
[0011]
FIG. 1 shows a pipe joint according to a preferred embodiment of the present invention. The center of the figure is a pipe joint 1 according to the present invention, which is connected to the respective ends of the left and right pipes 4b and 4c.
The pipe joint 1 has a band-shaped stopper portion 1a, which is a large-diameter portion corresponding to the outer diameter of the pipes 4b, 4c, at a substantially central portion of a short pipe slightly smaller than the inner diameter of the pipes 4b, 4c to be connected. Thereby, the short pipe is divided into left and right insertion portions 1b and 1c.
[0012]
A substantially L-shaped locking groove for inserting and locking a locking rod 5 disposed near the end of the pipe 4c from the opening toward the stopper 1a at the outer periphery of the end of the one insertion portion 1c. 3, 3 are provided symmetrically.
On the other hand, a pair of substantially inverted T-shaped engagement members which are inserted around an outer periphery of an end portion of the insertion portion 1b toward the stopper portion 1a through an engagement rod 5 disposed near an end portion of the pipe 4b and are engaged therewith. Stop grooves 3b, 3b (one not shown) are provided symmetrically.
[0013]
These locking grooves 3, 3 and 3b, 3b are arranged at positions shifted from each other by about 90 degrees on the outer periphery of the insertion portion. For example, the mark 7 on the stopper 1a and the locking of the pipe 4b The mark 5b, which is the end of the rod 5 and appears on the outer peripheral surface of the pipe, and the mark 5b of the locking rod 5 of the pipe 4c are arranged linearly around the mark 7 (parallel to the central axis of the pipe joint). In this state, both pipes are locked.
[0014]
Further, the mark 6 is arranged on the stopper portion a near the boundary with the insertion portion 1b so that the insertion portion 1b side having the substantially inverted T-shaped locking groove can be seen at a glance even after connection. At the position where the straight line connecting the mark 6 and the mark 5b, which is the end of the locking rod 5 of the pipe 4b, becomes parallel to the axis of the pipe joint, the locked state with the pipe 4b is released and the pipe 4b becomes the release position.
[0015]
Next, the operation of the pipe joint 1 of FIG. 1 will be described with reference to FIG.
[0016]
FIG. 2A shows a state in which the pipes 4 b and 4 c are connected and locked by the pipe joint 1. The locking rod 5 of the pipe 4b is locked to one locking portion of a substantially inverted T-shaped locking groove 3b at the end of the insertion portion 1b of the pipe joint 1. The locking rod 5 of the pipe 4c is also locked by the locking portion of the substantially L-shaped locking groove 3 at the end of the insertion portion 1c of the pipe joint 1. When the two pipes are locked (locked), the ends (marks 5b, 5b) of the ends of the two locking rods 5, 5 which are exposed on the outer peripheral surface of the pipe are located between the pipes. It is aligned with the mark 7 on the stopper 1a of the joint 1 so that the locked state can be confirmed.
[0017]
Then, when the pipe 1c is rotated in the direction of the arrow from the state of (A), the position where the locking rod 5 hits the corner of the locking groove 3 and stops is the release position, as shown in (B). The pipe 4c can be pulled out.
Next, when the pipe 4b is pulled out, the mark 5b is rotated in the direction of the arrow until a straight line connecting the mark 6 on the stopper 1a of the pipe joint 1 with the center axis of the pipe joint 1 is locked. From the position, the pipe is moved to the release position, and the pipe 4b can be pulled out as shown in FIG.
[0018]
FIG. 2 shows a case where the pipe joint 1 is not rotated when the pipe 4c is rotated. However, since the pipe 4c is normally rotated until it does not completely rotate, the pipe joint 1 itself also rotates. In the conventional pipe shown in FIG. 4, the other pipe is also in the released state, and the pipe joint falls off. However, in the pipe joint 1 of the present invention, as shown in FIG. 3, even when the pipe 4c rotates due to rotation, the locking rod 5 of the pipe 4b engages with the other locking portion of the locking groove 3b. It will be stopped and the rotation will stop.
[0019]
In the present embodiment, the mark 6 of the pipe joint 1 is the same as the mark 5b on the pipe as a hemispherical projection, but may have a different shape or paint. Further, although this is provided near the insertion portion having the substantially inverted T-shaped locking groove, it may be provided on the insertion portion side having the substantially L-shaped locking groove. May be provided at the center of the stopper portion as shown. Further, in the description of the operation of the present embodiment, the operation of rotating the pipe has been described, but the same applies when the pipe joint is rotated. Further, by providing a pair of substantially inverted T-shaped locking grooves at the insertion end of the pipe joint at positions opposite to the outer peripheral phase, two substantially T-shaped curved steel plate portions remain at the insertion end. However, since the narrowest portion becomes narrower than the steel plate portion remaining at the insertion end due to the substantially L-shaped locking groove, strength is a problem. On the other hand, it is possible to reinforce the narrowest portion by thickening the steel plate or attaching a reinforcing steel plate to the inner surface thereof.
Although the best mode for carrying out the present invention has been sufficiently described in the above description, the present invention is not limited to these.
[0020]
As a result, it can be used as it is for an existing pipe having a locking rod inside the end, and can be easily assembled and dismantled in the same procedure as a conventional pipe joint, and further has an insertion groove having a substantially L-shaped locking groove. In the operation of pulling out the part, the substantially inverted T-shaped locking groove on the opposite side is locked to the locking rod of the pipe, so that the accident of the joint pipe falling off can be minimized. In the present invention, the above-mentioned substantially L-shaped and substantially inverted T-shaped locking grooves have a shape when the insertion end is viewed upward. The groove may not be in the shape of a letter, but may be, for example, a groove in which the locking position portion of the locking rod is somewhat enlarged in a circular shape.
[0021]
In the stopper portion, a predetermined mark is provided near a boundary with one of the insertion portions, and after the connection, the insertion portion provided with the substantially L-shaped locking groove or the inverted T-shaped locking groove is inserted. By using a pipe joint that allows the user to confirm the pipe that has been pulled out, the pipe from which the pipe joint comes out or the pipe that is locked and retained when pulled out can be known in advance, and safety can be further improved.
[0022]
Further, the mark is positioned at a position indicating the release position of the insertion portion provided with the substantially inverted T-shaped locking groove, based on a positional relationship with the mark indicating the position of the locking rod on the outer periphery of the connected pipe. By using the arranged pipe joint, the locked state or the non-locked state can be determined in advance, the work becomes easy, and the falling-off accident can be prevented.
[0023]
【The invention's effect】
As described above, the pipe joint according to the present invention can be used for existing pipes that are widely used as it is, and can be easily assembled and dismantled with a simple configuration having a locking mechanism. Furthermore, the dismantling work can be easily performed by one person, and the number of accidents in which the pipe joints fall off can be reduced, so that safety in dismantling works such as temporary scaffolding, work can be shortened, and costs can be reduced.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a pipe joint according to an embodiment of the present invention.
FIG. 2 is a front view showing an operation example of the pipe joint according to the embodiment of the present invention.
FIG. 3 is a front view showing another operation example of the pipe joint according to the embodiment of the present invention.
FIG. 4 is a perspective view showing a pipe joint according to the related art.
[Explanation of symbols]
1, 2, pipe joint, 1a, 2a stopper part, 1b, 1c, 2b, 2c insertion part, 3, 3b locking groove, 4b, 4c pipe, 5 locking rod, 5b, 6, 7 mark

Claims (3)

A pipe joint interposed between both connecting ends of pipes connected to each other, the both ends of which are short pipes having an outer diameter that can be inserted into the connecting ends of the pipes to be connected, A stopper portion is provided for projecting a stopper portion with which a connecting end of the inserted pipe is in contact, and a locking rod is provided at both ends of the connecting end portion of each of the pipes. The locking groove formed in one insertion portion is substantially L-shaped provided symmetrically on the outer peripheral surface of the insertion portion from the insertion portion opening end toward the stopper portion, and the other insertion portion has A pipe joint having a substantially inverted T-shape in which a locking groove to be formed is provided symmetrically on an outer peripheral surface of an insertion portion from an opening end of the insertion portion toward the stopper portion. In the stopper portion, a predetermined mark is provided in the vicinity of a boundary with one of the insertion portions, and after the connection, the insertion portion provided with the substantially L-shaped locking groove or the substantially inverted T-shaped locking groove is provided. 2. The pipe joint according to claim 1, wherein the inserted pipe can be confirmed. The mark is arranged at a position indicating a release position of the insertion portion provided with the substantially inverted T-shaped locking groove, based on a positional relationship with the mark indicating the position of the locking rod on the outer periphery of the connected pipe. The pipe joint according to claim 2, wherein the pipe joint is formed.

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