JP2758559B2 - Round pipe coupling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting device for a circular pipe which can be suitably applied, for example, to a connecting portion between pillars of a temporary scaffold at a construction site.

[0002]

2. Description of the Related Art When connecting pillars on a temporary scaffold at a construction site, a short pipe joint is inserted into an end of one of the pillars, and the other pillar is fitted to the short pipe joint. Further, a method of connecting both legs by an arm lock is well known. However, this joint method requires not only the work of inserting and fitting the short pipe joint and the pedestal, but also the work of mounting the arm lock, which requires a large number of works and is very complicated. Is desired.

Conventionally, a large number of pillar connecting devices capable of improving workability have been proposed. For example, Japanese Utility Model Application No. 4-54773 and Japanese Patent Application No. 5-302154 disclose one type of connecting device. The small diameter joint pipe provided at the end is provided with a lock pin which is urged to protrude in the outer diameter direction in a state in which it is allowed to be immersed in the inner diameter direction, and the other pillar corresponds to the lock pin. A pillar connecting device having a lock pin engagement hole is disclosed. In this device, when the other pillar is fitted into the joint pipe, the inclined surface (cam surface) provided on the outer circumference of the lock pin is pushed into the inner edge of the pipe at the end face of the other pillar to lock the joint. When the pin is retracted and the lock pin reaches the engagement hole, it projects in the outer diameter direction and automatically engages with the hole. Thus, the pillars can be easily connected to each other simply by fitting one of the pillars.

[0004]

However, in the above-mentioned conventional pillar connecting device, the cam surface of the lock pin is formed by a flat surface, and the inner edge of the tube at the pillar end face abutting on the cam surface is arcuate. Because it is formed into a shape, the tube inner edge of the pillar end face contacts the cam surface of the lock pin at point contact when the pillar is fitted, so the contact portion between the two is very narrow,
The operating force concentrates on the narrow area. For this reason,
The lock pin does not enter smoothly, and, for example, a collision occurs, which causes a problem that the coupling operation cannot be performed satisfactorily.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a connecting device for circular pipes capable of easily and favorably connecting circular pipes such as pillars and connecting the circular pipes surely. The purpose is to do.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a circular pipe connecting device for connecting the ends of two circular pipes with their axes aligned with each other. A joint pipe having a diameter smaller than that of the circular pipe is provided coaxially at an end of the circular pipe, and a lock pin insertion hole is formed in a peripheral wall of the joint pipe, and a coupling tool accommodated in the joint pipe is provided. A lock pin is inserted into the lock pin insertion hole and is urged to protrude in the outer diameter direction in a state in which it is allowed to enter in the inner diameter direction. A lock pin engaging hole is formed to engage with the lock pin in a state where the circular pipe is engaged with the outside of the joint pipe when the circular pipe on the other side is externally fitted to the joint pipe. To the circular tube on the other side A first cam surface is provided to allow the lock pin to be pushed in to the inner diameter direction by being pushed into the inner edge of the tube on the surface and permit the outer fitting operation of the circular tube on the other side. while that will be formed in a curved surface along the tube-side edge of the end surface of the circular tube side, the b
Lock pin engages with the lock pin engagement hole.
The circular pipe on the other side
When the pin rotates relatively around the axis, the lock pin engages.
Locked by being pushed into the inside edge of the tube at the inner peripheral end face of the hole
Insert the pin in the inner diameter direction to engage the lock pin with the engagement hole.
And remove the circular pipe on the other side from the joint pipe.
A second cam surface for allowing operation is provided, and the second cam surface is provided.
The inner surface of the lock pin engaging hole
The gist is formed on a curved surface along the portion .

Further, in the present invention, the connecting member has a displacement which is engaged with an end face of the joint pipe to prevent the connecting member from being displaced in the axial direction toward one circular pipe. It is preferable to adopt a configuration in which a prevention piece is provided.

[0008]

In the connecting device for a circular pipe according to the present invention, the lock pin of the connecting tool housed in the joint pipe is inserted into the lock pin insertion hole of the joint pipe and is urged to protrude in the outer radial direction, while being pressed on the other side. When the circular pipe is fitted around the joint pipe, the lock pin is engaged with the lock pin engaging hole of the circular pipe on the other side. Therefore, the engagement prevents the circular pipe on the other side from being pulled out of the joint pipe, thereby enabling reliable connection. Further, the lock pin is provided with a first cam surface which is pushed into the inner edge of the circular pipe end face and immerses the lock pin in the inner diameter direction when the other circular pipe is externally fitted to the joint pipe. In addition, since the first cam surface is formed into a curved surface along the inner edge of the circular tube end face, if the other circular tube is fitted to the one circular tube, the first Is pressed by the circular pipe on the other side, and the lock pin is automatically retracted, so that the outer fitting operation of the circular pipe can be easily performed. In addition, when the circular pipe on the other side is externally fitted, the contact portion between the circular pipe and the first cam surface is widened, and the pressing force acting on the lock pin is not locally concentrated, so that a stable pressing force can be obtained. Therefore, the push-in operation of the lock pin can be smoothly performed, and the outer fitting operation of the circular pipe can be favorably performed.

[0009] Further locking pin, when the circular tube on the other side is rotated about the axis relative to the joint pipe, is pushed into the tube-side edge portion of the inner peripheral end surface of the lock pin engagement hole the lock pin in the inner diameter direction with a second cam surface for releasing the engagement immerses is provided, the cam surface thereof is formed in a curved surface along the tube-side edge portion of the lock pin engagement holes, either one By simply rotating the circular pipe around its axis, the lock pin is immersed and the engagement can be released, and the extraction operation of the circular pipe can be easily performed. In addition, when the circular pipe is rotated, the contact portion between the pipe inner edge of the lock pin engagement hole and the second cam surface is widened, and the pushing force acting on the lock pin is not locally concentrated and is stable. Since the pushing force is obtained, the pushing operation of the lock pin can be performed smoothly, and the extraction operation of the circular pipe can be performed favorably.

Further, in the present invention, when adopting a structure in which a position preventing piece which is locked to the end face of the joint pipe is provided on the connecting member, the lock pin is formed on the end face of the circular pipe by an external fitting operation of the circular pipe. When pressed, the connector, in other words, the displacement of the lock pin in the axial direction is prevented, and the lock pin smoothly enters without being locked in the lock pin insertion hole when immersed. Can be performed even better.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In this embodiment, an example in which an example of a connecting device for a circular pipe according to the present invention is applied to a connecting portion between pillars in a temporary scaffold at a construction site will be described.

As shown in FIG. 1, one of the two pillars (1) and (2) connected to each other has a smaller diameter at the end of one of the pillars (1). The joint tube (3) is fixed by welding in a state in which one side half of the joint tube (3) is fitted, and two lock pin insertion holes (2) are formed in the peripheral wall of the joint tube (3) so as to face each other. 3
1) (31) is formed.

The other pillar (2) is formed to have the same diameter as the one pillar (1), and the other half of the joint pipe (3) can be fitted into the end. It is configured as follows. Furthermore, two locks that fit into the two lock pin insertion holes (31) and (31) respectively in a state where the ends of the pillars (2) are externally fitted to the joint pipe (3) are provided in the peripheral wall. Pin engagement holes (21) and (21) are formed. Lock pin engagement holes (21) (21)
Are each formed in a circular shape as can be clearly understood from the drawings.

As shown in FIGS. 1 to 3, a connecting member (4) for connecting the two pillars (1) and (2) is made of metal.
It is formed so as to be bent in a U-shape (inverted U-shape), and is stretched between the two leg pieces (41) and (41) and between the two leg pieces (41) and (41). And an elastic bridging piece (42) having the following.

A bridging piece (42) of the two leg pieces (41) (41)
The side end portions are partially cut and raised, respectively, and are provided with position preventing pieces (43) (4) so as to protrude outward.
3) is formed. Also, both leg pieces (41) (41)
In the outer surface on the distal end side of the head, misalignment preventing pieces (43) (4)
The distance from the joint pipe (3) is equal to the distance from the joint pipe (3) to the lock pin engagement holes (31) and (31), and the tip portions (41a) of the two leg pieces (41) and (41).
The lock pins (5) and (5) are fixed to the bridging piece (42) side slightly from (41a) so as to protrude outward.

These lock pins (5) and (5) have one side area in the axial direction when the connecting member (4) is attached to the joint pipe (3) as described later, in other words, FIG.
The upper area is cut diagonally toward the paper surface of (a) to (c), and the first cam surface (51) (5)
1) are formed respectively, and one side area around the axis in the state of being attached to the joint pipe (3);
In other words, the left side region is cut obliquely toward the paper surface of FIGS. 3B and 3C, and the second cam surface 52 is cut.
(52) are respectively formed. As will be described in detail later, the first cam surface (51) is not a flat surface, but is formed by a curved surface so as to be along the inner edge of the tube at the end surface of the other pillar (2). The second cam surface (5
2) is also not a flat surface, but is formed into a curved surface along the tube inner edge at the inner peripheral end surface of the lock pin engagement hole (21) of the other pillar (2).

The connecting member (4) is accommodated in the joint pipe (3) with the elastic hanging piece (42) bent inward. At this time, the misalignment preventing pieces (43) (4)
3) is locked on the end face (3a) of the joint pipe (3), and the lock pins (5) and (5) are inserted through the lock pin insertion holes (31) and (31), and the outer circumference of the joint pipe (3) is formed. It is arranged to protrude outward from the surface. In this state, when the lock pins (5) and (5) are pushed inward, the elastic hooking pieces (42) bend and the two leg pieces (41) (4).
By 1) is closed, while immersed to the lock pin (5) (5) b <br/> Kkupin insertion hole (31) (31) inside, is released to push the lock pin (5) (5), The lock pin (5) (5) is generated by the elastic restoring force of the elastic hooking piece (42).
Is configured to be held in a state protruding outward from the outer peripheral surface position of the joint pipe (3).

In this embodiment, in order to connect the pillars (1) and (2), the lock pins (5) and (5) and the lock pin engaging holes (21) and (21) of the other pillar (2). 4A, the end of the other pillar (2) may be fitted to the joint pipe (3) as shown in FIG. 4 (a). As a result, as shown in FIG. 4B, the end surface (2a) of the other pillar (2) comes into contact with the first cam surface (51) of the lock pin (5) and the lock pin (5). 4c, it moves on the cam surface along the axial direction while pushing inward, and as shown in FIG. 4 (c), the other pillar (2) pushes the lock pin (5) inward on the inner peripheral surface. It is fitted outside while being pushed into. 4 (d) and 5
As shown in (a), when the other pillar (2) is externally fitted until it abuts against the end face of one pillar (1), the lock pin (5) is locked by the lock pin engagement hole (21). ), And is projected outward and inserted into the lock pin engagement hole (21) by the restoring force of the elastic hanging piece (42). By this insertion, the lock pin (5) is inserted into the lock pin engagement hole (21).
To prevent the other pillar (2) from coming off in the axial direction from the joint pipe (3), so that the two pillars (1) and (2) are connected. .

By the way, as shown in FIG. 6 (a), when the other pillar (2) is externally fitted to the joint pipe (3), a lock pin is formed on the end face (2a) of the pillar (2). (5)
It is the pipe inner edge (X) that actually abuts the first cam surface (51) of the pipe, and with the insertion of the joint pipe (3), this pipe inner edge (X) is imagined in FIG. Line (X1)-
As shown in (X5), the lock pin (5) moves on the first cam surface (51). In this case, in the present embodiment, as described above, the first cam surface (5
Since (1) is formed on the curved surface along the inner tube edge (X), when the inner tube edge (X) moves while pushing the cam surface (51), the contact portion between the two is formed. As a result, the pushing force of the lock pin (5) by the pipe inner edge (X) is not locally concentrated, so that a stable pushing force is obtained, and the lock pin (5) can be smoothly immersed. Therefore, at the time of externally fitting the other pillar (2) to the joint pipe (3), it is possible to perform the external fitting operation satisfactorily without occurrence of sticking or the like.

Further, in this embodiment, the misalignment preventing piece (43) of the connecting member (4) is connected to the end face (3) of the joint pipe (3).
Since it is locked to a), the outer fitting operation of the other pillar (2) can be performed more favorably as described below. That is, in a state in which the connecting member (4) is simply housed in the joint pipe (3) without forming a displacement preventing piece or the like, for example, as shown by an imaginary line in FIG. When the other pillar (2) is externally fitted to the joint pipe (3), the lock pin (5) is pushed by the end face (2a) of the pillar (2) together with the connecting tool (4) in the axial direction. May be displaced along one of the legs (1). When the displacement occurs, as shown by the imaginary line in FIG.
Even if the lock pin (5) tries to enter inward, the lock pin (5) is locked in the lock pin insertion hole (31) to hinder the immersion operation. It becomes impossible to externally fit the side pillar (2). On the other hand, in the present embodiment, the locking pin (5) is locked on the other side because the misalignment preventing piece (43) of the connecting tool (4) is locked on the end face (3a) of the joint pipe (3). Pedestal (2)
Thus, even when the connector (4), that is, the lock pin (5), is displaced in the axial direction even if it is pushed in the axial direction. For this reason, the lock pin (5) does not lock in the lock pin insertion hole (31) when immersed,
Since the immersion operation of the lock pin (5) is performed smoothly, the external fitting operation of the pillar (2) can be performed well.

In this embodiment, the lock pin (5) is connected to the tip portions (41a) (41a) of the two leg pieces (41) (41).
In other words, the projection (41) is located closer to the tip of the leg than the lock pin (5).
a) Since (41a) exists, the pillar connection state is not unintentionally released. That is, as shown in FIG. 8, when a force is generated to pull out the other pillar (2) in the pillar connected state, the lock pin (5) becomes , Is pushed by the inner peripheral end surface (21a) of the lock pin engaging hole (21) of the pillar (2) and tries to enter inward. At this time, the tip portions (41a) (41a) of the two leg pieces (41) (41) are locked around the lock pin insertion hole on the inner peripheral surface of the joint pipe (3), so that the lock pin (5) is locked. The lock pin (5) and the engagement hole (21) are kept in the engaged state because the lock pin (5) and the engagement hole (21) are prevented from immersing inward. Therefore, the connection state is not unintentionally released.

On the other hand, to release the connection from the pillar connection state shown in FIG. 5A, first, as shown in FIG. 5B, the other pillar (2) is connected to the one pillar (1). ) Or the joint pipe (3) is rotated clockwise in one direction around the axis, toward the plane of the figure. Thereby, the inner peripheral end surface of the lock pin engaging hole (21) abuts on the second cam surface (52) of the lock pin (5) and moves on the cam surface while pushing the lock pin (5) inward. I will do it. As a result, FIG.
As shown in (c), the lock pin (5) is immersed in the lock pin insertion hole (31), and the engagement with the lock pin engagement hole (21) is released.

After the engagement of the lock pin (5) is released, the joint pipe (3) is pulled out from the other pillar (2). The pillars (1) and (2) can be disassembled.

As shown in FIG. 9, when the other pillar (2) is rotated around the axis, the lock pin (5) of the inner peripheral end face (21a) of the lock pin engagement hole (21) is rotated. ) Abuts against the second cam surface (52) at the inner tube edge (Y), and as the pillar (2) rotates, the inner tube edge (Y) changes to the imaginary line (FIG. 10). As shown in (Y1) to (Y4), it moves on the second cam surface (52). In this case, as described above, the second cam surface (5
Since 2) is formed on the curved surface along the inside edge (Y) of the tube, the contact portion between the inside edge (Y) of the tube and the cam surface (52) is widened, and the lock pin (5) is formed. A stable pushing force is obtained, so that the lock pin (5) can be smoothly immersed, and the other pillar (2) can be rotated, that is, the pillar (2) can be disassembled. it can.

As described above, according to the pillar connecting apparatus of this embodiment, the joint pipe (3) is connected to the other pillar (2).
, The pillars (1) and (2) can be easily connected to each other, and can be easily disassembled simply by rotating and pulling out one of the pillars.

Further, the connecting device of the pillar of this embodiment is designed to realize the device configuration by housing the connecting member (4) in the joint pipe (3). If the fitting (4) is damaged, it can be used again without any trouble by replacing only the coupling (4) without discarding the pillars (1) (2) and the joint pipe (3). Thus, the parts can be effectively used. further,
In the present embodiment, there is no need to separately provide a member for unlocking, for example, an unlocking pin, and the number of components can be reduced accordingly.

[0027]

As described above, according to the circular pipe connecting apparatus of the present invention, the lock pin of the connecting tool housed in the joint pipe is inserted into the lock pin insertion hole of the joint pipe and protrudes in the outer diameter direction. In the state where the other side of the circular pipe is fitted to the joint pipe while being urged, the lock pin is engaged with the lock pin engagement hole of the other side of the circular pipe. In addition, the other circular pipe is prevented from being removed from the joint pipe, and can be securely connected. Further, the lock pin is provided with a first cam surface which is pushed into the inner edge of the circular pipe end face and immerses the lock pin in the inner diameter direction when the other circular pipe is externally fitted to the joint pipe. And the first cam surface is formed into a curved surface along the inner tube edge of the circular tube end face,
If the circular pipe on the other side is externally fitted to the circular pipe on the one side, the first cam surface is pushed by the circular pipe on the other side, and the lock pin is automatically retracted. Consequently, the connecting operation can be easily performed. In addition, when the circular pipe on the other side is externally fitted, the contact portion between the circular pipe and the first cam surface is widened, and the pressing force acting on the lock pin is not locally concentrated, so that a stable pressing force can be obtained. because it is smoothly performed push operation of the lock pin, fitted operation of the circular tube, Ru can satisfactorily thus connecting operation.

Further , when the circular pipe on the other side rotates around the axis with respect to the joint pipe, the lock pin is pushed into the inner edge of the inner peripheral end face of the lock pin engaging hole, and the lock pin is pushed in the inner diameter direction. with a second cam surface for releasing the engagement immerses is provided, the cam surface thereof is formed in a curved surface along the tube-side edge portion of the lock pin engagement holes, either one By simply rotating the circular tube around the axis, the lock pin will sink and release the engagement,
Extraction operation of a circular tube can be performed easily. In addition, when the circular pipe is rotated, the contact portion between the pipe inner edge of the lock pin engagement hole and the second cam surface is widened, and the pushing force acting on the lock pin is not locally concentrated and is stable. Since the pushing force is obtained, there is an effect that the pushing operation of the lock pin can be performed smoothly, and the operation of extracting the circular tube can be performed favorably.

Further, in the present invention, when adopting a structure in which the connecting member is provided with a misalignment preventing piece which is engaged with the end face of the joint pipe, the lock pin is fixed to the end face of the circular pipe by the outer fitting operation of the circular pipe. When the is pressed, the displacement of the connecting tool, in other words, the lock pin in the axial direction is prevented, and the lock pin is smoothly inserted without locking into the lock pin insertion hole, so that the connecting operation of the circular pipe can be performed more easily. There is an advantage that it can be performed better.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a connecting device for a circular pipe such as a pillar for a temporary scaffold according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a connecting tool applied to the connecting device of the embodiment.

FIG. 3 is a view showing a coupling tool applied to the embodiment,
2A is a front view, FIG. 2B is a right side view, FIG. 2C is a left side view, FIG. 1D is a top view, and FIG. 1E is a bottom view.

FIGS. 4A to 4C are side sectional views showing the connecting device according to the embodiment, wherein FIGS. 4A to 4C show a state in which a joint pipe is being inserted, and FIG. It is a figure showing the state where insertion was completed.

FIGS. 5A and 5B are plan sectional views showing the connecting device of the embodiment, in which FIG. 5A shows a state immediately after the rotation of the other pillar is started, and FIG. FIG.
FIG. 5 is a diagram showing a state in which rotation is completed.

FIG. 6 is a cross-sectional view showing a contact state between a lock pin and a pillar in the connecting device of the embodiment.

FIG. 7 is a perspective view showing a contact state between a lock pin and an end surface of a pillar on the other side in the connection device of the embodiment.

FIG. 8 is a cross-sectional view showing an engagement state between a lock pin and an engagement hole of the other leg in the connection device of the embodiment.

FIG. 9 is a cross-sectional view showing a contact state between a lock pin and an inner peripheral end surface of an engagement hole of the other leg in the connecting device of the embodiment.

FIG. 10 is a perspective view showing a contact state between a lock pin and an inner peripheral end surface of an engaging hole of the other leg in the connecting device of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... One pillar 2 ... The other pillar 2a ... Pillar end face 3 ... Joint pipe 3a ... Joint pipe end face 4 ... Connector 5 ... Lock pin 21 ... Lock pin engagement hole 21a ... Inner peripheral end face 31 ... Lock pin insertion hole 43 ... Position shift preventing piece 51 ... First cam surface 52 ... Second cam surface X, Y ... Tube inner edge

Claims (2)

(57) [Claims] 1. A circular pipe connecting device for connecting ends of two circular pipes with their axes aligned with each other, wherein a pipe diameter smaller than the circular pipe is provided at one end of the circular pipe. The joint pipe is provided coaxially, a lock pin insertion hole is formed in a peripheral wall portion of the joint pipe, and a lock pin of a connecting tool housed in the joint pipe is
It is inserted into the lock pin insertion hole and is urged to protrude in the outer diameter direction in a state where it is allowed to enter in the inner diameter direction, and the end of the circular pipe on the other side is externally fitted to the joint pipe. A lock pin engagement hole for engaging with the lock pin to prevent removal from the joint pipe in the closed state, wherein the lock pin has the other side when the circular pipe on the other side is externally fitted to the joint pipe. A first cam surface which is pressed into an inner edge of the end surface of the circular tube to indent the lock pin in the inner diameter direction and allows an outer fitting operation of the circular tube on the other side; , while the Ru is formed in a curved surface along the tube-side edge portion of the other side end surface of the circular tube, said locking pin, said locking pin engaging hole that pin
The circular pipe on the other side is
When rotated around the axis relative to the pipe, the lock pin
Into the inner edge of the tube at the inner peripheral end face of the
Insert the lock pin in the inner diameter direction and engage the lock pin
From the joint pipe of the circular pipe on the other side.
A second cam surface is provided for allowing the pulling operation of the lock pin.
A connecting device for a circular pipe, which is formed on a curved surface so as to extend along an inner edge of the pipe. 2. The connector has a misalignment preventing piece which is engaged with an end face of the joint pipe to prevent the coupler from being displaced along the axial direction toward one of the circular pipes. The connecting device for a circular pipe according to claim 1, wherein