JP5367852B2 - Crossing - Google Patents

Description

The present invention relates to cross braces used for reinforcement of framework scaffolds and the like.

In the conventional cross bar crossing, a shaft hole is provided in the transverse direction at each intermediate point in the longitudinal direction of two main pipes of the same length, and a rivet is inserted into the shaft hole to rotate the two main pipes relative to each other. It connects freely, and the connection hole for connecting to vertical frame members, such as a framework scaffold, or a horizontal frame member is provided in each both ends of a main body pipe.

The problem with crossing bars constructed in this way is that the shaft hole is provided so as to penetrate in the transverse direction of the main body pipe, so that the cross section of the pipe is reduced at the joint portion, the strength of the joint portion is reduced, and Depending on the size, the main pipe may break at the joint, and it cannot withstand long-term use.

In the cross bar crossing of Prior Art Document 1, a coupling fitting that couples two main body pipes rotatably is used. This joint metal fitting is made by providing a shaft hole at the center of two connecting plates bent into a V-groove shape, inserting a rivet through the shaft hole, and connecting the two connecting plates to each other in a rotatable manner. The both ends of each connection plate are fixed to the side surface of the main pipe by welding.

In the cross bar crossing of Prior Art Document 1, since the through hole is not provided in the main body pipe, there is no problem of strength reduction of the main body pipe, but the end of the connection plate is welded to the peripheral side surface of the main body pipe. As described above, since the coupling member projects into the external space of the main body pipe, downsizing of the coupling portion of the main body pipe is hindered, and a large space is required for storage and transportation.

In the cross bar crossing of Prior Art Document 2, a coupling fitting that couples two main body pipes rotatably is used. This connecting metal fitting has a shaft hole in the center of two connecting members bent in a U-shape, and a rivet is inserted into the shaft hole so that the two connecting members are rotatably connected to each other. The both end portions of each connecting member are welded to the peripheral side surface of the main body pipe.

In the cross bar crossing of Prior Art Document 2, since there is no through hole in the main body pipe, there is no problem of strength reduction of the main body pipe. However, since the connecting member is welded to the peripheral side surface of the main body pipe, The compaction of the portion is hindered, and the space is bulky during storage and transportation.

Public utility Showa 55-35147 Japanese Patent Publication No. 2001-288886

The problem to be solved is to increase the durability of crossing bars by avoiding the provision of through holes in the main body pipe and to reduce the cost of the plating process for rust prevention.

The features of the crossing of the present invention are composed of two main pipes having the same length, and a rivet that couples the two main pipes to each other at a midpoint in the longitudinal direction,
An inner pipe is fitted inside a longitudinal intermediate point portion of each main body pipe, and a groove portion on one side of the peripheral side surface of the intermediate point portion of each main body pipe enters a concave portion on one side of the peripheral side surface of each inner pipe. And
A shaft hole for inserting the rivet is formed in the bottom wall of the groove and the bottom wall of the recess, and is formed through the body pipe and the inner pipe in the transverse direction.
The head portion of the rivet is accommodated in the groove portion of one main body pipe, and the tip caulking portion of the rivet is accommodated in the groove portion of the other main body pipe.

In the cross bar crossing of the present invention configured as described above, the two main body pipes are coupled to each other by a rivet at a middle point in the longitudinal direction. An inner pipe is fitted inside, a groove on one side of the peripheral side of the middle point of each body pipe enters a recess on one side of the peripheral side of each inner pipe, and a shaft hole for inserting a rivet has a bottom of the groove Since it is formed in the wall and the bottom wall of the recess and penetrates in the transverse direction of each main body pipe and each inner pipe, the pipe cross section as a whole of the shaft hole forming portion is multiplied, so that the rivet The joint part is strengthened, durability is improved, and it can withstand long-term use.

Further, the reinforcing inner pipe is accommodated in the internal space of the main body pipe, and the head portion of the coupling rivet for the main body pipe is accommodated in the groove portion of one main body pipe, and the tip caulking portion thereof is the other main body. Since it is accommodated in the groove portion of the pipe and no coupling member protrudes in the external space of the main body pipe, the coupling portion of the main body pipe is configured to be compact and does not take up space during storage and transportation.

Further, since the groove on one side of the peripheral side surface of the intermediate point portion of each main body pipe has a recess on one side of the peripheral side surface of each inner pipe, the inner pipe does not move within the main body pipe. Thus, since the inner pipe is stably held at a predetermined position, the rivet can be inserted and the caulking process can be performed efficiently.

FIG. 1 is a front view of crossing crossing according to an embodiment of the present invention. FIG. 2 is a front view when one end portion of the pipe material is flattened by pressing to produce a main body pipe used for crossing the cross bars of FIG. 1 and the flat portion is subjected to R processing. FIG. 3 is a side view of the main body pipe of FIG. FIG. 4+ is a front view when the inner pipe is fitted into the internal space of the intermediate point portion of the main body pipe material of FIG. 2 by an appropriate jig. FIG. 5 is a front view when the main body pipe of FIG. 4 is extracted from the jig and a groove portion of the main body pipe and a concave portion of the inner pipe are simultaneously formed by pressing. 6 is a side view of the main body pipe of FIG. FIG. 7 is a front view when the opposite end portion of the main body pipe of FIG. 5 is flattened by press working, and the flat portions are subjected to R processing to form connection holes in both flat portions. FIG. 8 is a side view of the main body pipe of FIG. FIG. 9 is a side view when the main body pipe of FIG. 7 is coupled with rivets. FIG. 10 is a side view when the two main body pipes of FIG. 9 are joined. FIG. 11 is a cross-sectional view of the joined portion before the rivet tip portion is caulked.

In the illustrated embodiment, the two main body pipes 1 and 1 are made of a metal pipe material and have the same length. A groove 2 is formed by pressing on one side of the peripheral side surface of the intermediate point portion in the longitudinal direction of each main body pipe 1. 2 to 8 show a process of manufacturing the main body pipe.

As shown in FIG. 2 and FIG. 3, the metal main body pipe 1 is flattened at one end, and an R process 4 is applied to the tip of the flat portion 3.
As shown in FIG. 4, the other end of the main body pipe 1 is open, so that a metal inner pipe 5 is fitted by using an appropriate jig 6, and the inner pipe 5 extends in the longitudinal direction of the main body pipe 1. It is positioned at the midpoint part of.
In this state, the groove portion 2 of the main body pipe 1 and the concave portion 7 of the inner pipe 5 are simultaneously formed by pressing, and the bottom wall portion of the groove portion 2 of the main body pipe 1 enters the concave portion 7 of the inner pipe 5.

Since the groove portion 2 of the main body pipe 1 and the concave portion 7 of the inner pipe 5 are formed in the inserted state, the movement of the inner pipe 5 with respect to the main body pipe 1 is restricted, and the bottom wall of the groove portion 2 of the main body pipe 1 and the inner pipe 5 The shaft hole 8 can be formed by pressing on the bottom wall of the recess 7 without deviation. The shaft hole 8 is processed after the main body pipe 1 is extracted from the jig 6 as shown in FIG.

As shown in FIGS. 7 and 8, the other end of the main body pipe 1 is also flatly pressed, and an R-cut 4 is applied. Connection holes 9 are opened in the flat portions 3 at both ends. The connection hole 9 is used when connecting cross bars to a pair of vertical frame members and horizontal frame members such as a framework scaffold.
The two main body pipes 1 and 1 manufactured as described above are arranged in opposite directions so that the groove portion 2 faces upward in one body pipe 1 and the groove portion 2 faces downward in the other body pipe 1. Is done. A rivet 11 is inserted into the shaft hole 8 of the upper and lower body pipes 1, 1 with a washer 10 interposed therebetween. As described above, the shaft hole 8 passes through the bottom wall of the groove 2 of the main body pipe 1 and the bottom wall of the recess 7 of the inner pipe 5.

The caulking process of the rivet 11 is performed so that the two main body pipes 1 and 1 can rotate with respect to the rivet 11. The head 11a of the rivet 11 is accommodated in the groove 2 of the upper body pipe 1, and the tip caulking portion 11b of the rivet 11 is accommodated in the groove 2 of the lower body pipe 1, and is coupled to the external space of the body pipe. There are no protruding parts.

DESCRIPTION OF SYMBOLS 1 Main body pipe 2 Groove part of main body pipe 3 Flat part 4 R process part 5 Inner pipe 6 Jig 7 Inner pipe recessed part 8 Shaft hole 9 Connection hole 10 Washer 11 Rivet

Claims (1)

The two main pipes of the same length, and a rivet that couples the two main pipes to each other at a midpoint in the longitudinal direction,
An inner pipe is fitted inside a longitudinal intermediate point portion of each main body pipe, and a groove portion on one side of the peripheral side surface of the intermediate point portion of each main body pipe enters a concave portion on one side of the peripheral side surface of each inner pipe. And
A shaft hole for inserting the rivet is formed in the bottom wall and the recess of the groove portion so as to open in the bottom wall and penetrate through the body pipe and the inner pipe in the transverse direction.
A crossed brace where the head portion of the rivet is accommodated in the groove portion of one main body pipe, and the tip caulking portion of the rivet is accommodated in the groove portion of the other main body pipe.

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