JP2005207535A - Coupling tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coupling tool used to couple together leg columns structured simply and capable of establishing secure coupling of the leg columns with each other. <P>SOLUTION: The coupling tool 10 is formed by folding a metal piece into U-shape so that legs 12 are provided at the two ends rigidly, and is equipped with a base piece 11 positioned in the center of the metal piece and setting over the two legs 12 relative to each other and a dislocation preventive piece 13 formed by cutting up one part of each leg and extending to the ends of the base piece, wherein each leg 12 is furnished with folding parts 15 formed by folding outward at the two end about the longitudinal direction, a lock part 20 formed in the over-part at a certain spacing from the leg bottom from a pair of lock pieces 7 and 8 inclined to the leg center continuously from each folding part so that a projection is generated on the leg surface, in which the over-part of the lock piece 7 is furnished with an edge part 7b whose two edge members intersect while the over-part of the other lock piece 8 is formed as a curved part 8b where gradual edges continue. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a connector for connecting cylindrical tubes used when assembling a temporary scaffolding at a construction site, and particularly to a structure of a connector that can reliably connect cylindrical tubes with a simple configuration.

  Conventionally, as this type of connecting tool 70, as shown in FIG. 10, a metal material is bent into a U shape to form leg pieces 72, 72 at both ends of the hanging piece 71. A lock pin (lock portion) 73 protruding outward is mounted by caulking. The lock pin 73 is formed in a substantially truncated cone shape having a first cam surface 74 serving as a taper surface on the spanning side (upper side) and a second cam surface 75 serving as a taper surface on one side of the lateral side. (Patent Document 1).

  As shown in FIG. 10, the leg columns 80, 90 connected by the connecting tool 70 have a short joint pipe 81 having a diameter smaller than that of the leg column at the end of the leg column 80 on one side. The joint pipe 81 is configured to be inserted into the other pedestal 90 while being fixed by welding processing in a state of being inserted therein. Two lock part insertion holes 82 and 82 are formed in the peripheral wall part of the joint pipe 81 so as to face each other, and two lock parts insertion holes 82 and 82 are also opposed to the peripheral wall part of the pedestal 90 into which the joint pipe 81 is inserted. Lock part insertion holes 92 and 92 are formed.

Then, the lock pin 73 of the coupling tool 70 is inserted into each lock portion insertion hole 82 in the joint pipe 81 so that the lock pin 73 is fitted, and the joint pipe 81 is inserted into the other leg pillar 90 to The lock pins 73 are fitted into the respective lock portion insertion holes 92 to connect the pedestals 80 and 90 to each other.
When the pedestal 90 is externally fitted to the joint pipe 81, each lock pin 73 is pressed by pressing the wall surface in the pedestal 90 so as to contact the first cam surface 74 and slide the first cam surface 74. Is retracted into the joint pipe 81 and is returned to the locked state by being fitted into the lock portion insertion hole 92.

When releasing the connection between the pedestals 80 and 90, the lock pins 73 are retracted into the joint pipe 81 by rotating in the direction in which the inner wall of the pedestal 90 abuts against the second cam surface 75. In this state, the pedestal 90 can be removed from the joint tube 81.
JP 7-166695 A

According to the connecting tool 70 having the above structure, since the lock pins 73 made of different members are attached to the leg pieces 72, there is a problem that the production is troublesome.
In particular, the production of the first cam surface 74 and the second cam surface 75 in the lock pin 73 requires a cutting process, and the taper angle needs to be processed with high accuracy, so that the production is difficult. There was a problem that the manufacturing cost was high.
In addition, when the lock pin 73 is caulked to the leg piece 72, the taper angle must be used effectively so that positioning in the accurate rotational direction is necessary.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a connector that can ensure sufficient strength with a simple structure.

In order to achieve the above object, the invention according to claim 1 is a connector integrally formed so as to have leg pieces at both ends by bending a metal piece into a U-shape. It is characterized by having a configuration.
Base piece. This base piece is located at the center of the metal piece and bridges the leg pieces.
Misalignment prevention piece. This misalignment prevention piece extends at both ends of the base piece by cutting and raising a part of the leg piece.
Each leg piece has a bent portion bent outward at both ends along the longitudinal direction thereof, and a locking portion having a protruding shape on the surface side of the leg piece at an upper position spaced from the lower end portion of the leg piece. It is provided and configured.
The lock portion includes a pair of lock pieces that are connected to the bent portions of the leg pieces and are inclined toward the center of the leg pieces.

  According to a second aspect of the present invention, in the above-described connector, with respect to the lock pieces formed on the leg pieces, the upper side of one lock piece forms an edge portion where two sides intersect, and the upper side of the other lock piece has a continuous side. The one lock piece and the other lock piece are formed at the same position in each leg piece.

  According to the first aspect of the present invention, the bent portion is formed along the longitudinal direction of each leg piece, and the lock portion is connected to the bent portion, so that the lock portion is deformed with respect to the leg piece. By making it difficult, sufficient strength can be secured.

  According to the second aspect of the present invention, the upper side of one lock piece is formed with an edge portion where two sides intersect, so when the lock portion is inserted into the hole of the cylindrical tube and the cylindrical tube is rotated. The edge of the hole is caught in the edge portion, and the rotation is restricted, making it impossible to remove the cylindrical tube.

  Conversely, since the upper side of the other lock piece is formed so that the sides are continuous, when releasing the connected state of the cylindrical tube, the end of the hole abuts along the side by the rotation of the cylindrical tube, and the lock is locked. The part can be retracted into the pipe, and the cylindrical tube can be easily detached.

A connector as an example of an embodiment of the present invention will be described with reference to FIGS.
1 is an explanatory perspective view of the connector, FIG. 2 is an explanatory plan view showing the developed state of the connector, FIG. 3 is an explanatory perspective view of the connector with the pedestal attached to the cylindrical tube, and FIG. b) and (c) are respectively a plane explanatory view, a front explanatory view, and a side explanatory view of the coupler.

  A connecting tool 10 according to an example of the embodiment is formed by bending leg pieces 12 at both ends of a base piece 11 as shown in FIG. 1 by bending an elongated rectangular metal piece 1 as shown in FIG. 2 into a U shape. , 12 so as to have elasticity by being integrally formed, and the upper position spaced from the lower end of the leg piece and the misalignment prevention piece 13, the bent part 15 bent outward, and the leg piece lower end part. Are provided with a locking portion 20 having a protruding shape on the surface side of the leg piece.

The metal piece 1 is formed with a notch line 3 for forming the misregistration prevention piece 13 so as to be symmetric with respect to the center line 2, and is provided on the leg piece 12 outside the notch line 3. An opening 4 is formed.
Further, on both sides of the part 5 to be each leg piece 12, a part 6 constituting the bent portion 15 is formed along the longitudinal direction, and lock pieces 7 and 8 are continuously provided. The pair of lock pieces 7 and the lock pieces 8 constituting the lock portion 20 formed on both sides of each leg piece 12 are configured so that the shapes of the upper sides are different, and the portions 5 where the lock pieces 7 and 8 are connected are It is formed in a shape that is point-symmetric with respect to the center point on the center line 2.

  The dotted line 9a in the figure indicates the formation position of the bent portion for bending in a U-shape, the dotted line 9b indicates the bent position for forming the bent portion 15, and the dotted line 9c stands for the lock pieces 7, 8. The bending positions for setting are respectively shown.

Therefore, when the metal piece 1 in FIG. 1 is bent in the same direction along the dotted line 9a, a U-shaped piece in which the leg pieces 12 are formed on both sides of the base piece 11 located at the center can be formed. By making the position of the dotted line 9a that is the bending position relatively outside, it is possible to make the bent portion 15 formed on the leg piece 12 abut the inner wall of the cylindrical tube (take more contact surface), It is possible to prevent rattling when the connector 10 is mounted on the cylindrical tube.
The base piece 11 is located at the center of the metal piece 1 and spans the leg pieces 12 and is formed shorter than the diameter of the joint pipe (cylindrical pipe) 81 to which the connector 10 is attached. At both ends of the base piece 11, a misalignment prevention piece 13 formed by cutting and raising a part of the center of the leg piece 12 in a square shape is extended.

  Further, the leg piece 12 is bent at a substantially right angle along the dotted line 9b to form a bent portion at both positions of each leg piece, and the dotted line 9c is bent so that each lock piece is inclined toward the leg piece center side. Thus, a lock portion 20 that is convex on the surface side of the leg piece 12 is configured.

  The distance L between the end portions of the misalignment prevention pieces 13 is longer than the inner diameter φ of the joint pipe 81 to which the connector 10 is attached and shorter than the outer diameter. Therefore, when the connector 10 is mounted in the joint tube, the connector 10 is buried in the joint tube (cylindrical tube) 81 by the position shift prevention piece coming into contact with and engaging with the upper end of the joint tube 81. In addition, the lock portion 20 can be positioned in the lock portion insertion hole 82 of the joint pipe 81.

A lock portion 20 is formed at a position below each leg piece 12 by bending the lock pieces 7 and 8 so that a convex portion is located on the surface side of the leg piece 12. The lock portion 20 is composed of a pair of lock pieces 7 and 8 that are bent so as to be inclined toward the center side of the leg piece 12 with respect to the bent portion 15. It is formed in an adjacent wedge shape (FIG. 4A).
Since the lock pieces 7 and 8 are formed continuously with the bent portion 15, the strength against a force from the direction in which the lock pieces 7 and 8 are bent with respect to the leg piece 12 can be increased.

One lock piece 7 (the right lock piece 7 in the connector of FIG. 4B) is a member that forms the edge portion 7b by intersecting the lower side 7a substantially perpendicular to the bent portion 15 and the two sides. The stop side 7c and the inclined side 7d, and the side side 7e connecting the inclined side 7d and the lower side 7a are configured.
The other lock piece 8 (the left-side lock piece 8 in the connector of FIG. 4B) has a lower side 8a substantially orthogonal to the bent part 15, and an upper side 8c having a curved part 8b with continuous sides, It is comprised from the side 8d which connects the upper side 8c and the lower side 8a.
A bent portion 15 is located below the leg piece 12 on which the lock portion 20 is formed.

  The lock pieces 7 and 8 constituting the lock portion 20 formed on each leg piece 12 have the same formation position of the one lock piece 7 and the other lock piece 8 in each leg piece 12, and are relative to the base piece 11. They are arranged so as to be point-symmetric.

  Subsequently, a case where cylindrical tubes are connected to each other using the connector having the above structure will be described with reference to FIGS. FIG. 5 is a view of the coupling tool mounted on the pedestal as viewed from the side, FIG. 6 is a diagram illustrating a part of the coupling tool, and FIGS. 7 and 8 illustrate the coupling tool mounted on the pedestal from below. FIG. 9 is a perspective view of the connector in a state where it is attached to the pedestal.

  As described in the prior art, the pedestal column connected by the connector 10 has a limb column (cylindrical tube) 80 with a short joint tube 81 having a diameter smaller than that of the pedestal column inserted at the end. The other pedestal (cylindrical tube) 90 has a diameter into which the joint tube 81 can be inserted. Two circular lock portion insertion holes 82 are formed in the peripheral wall portion of the joint pipe 81 so as to face each other, and 2 so as to face the peripheral wall portion of the leg 90 into which the joint pipe 81 is inserted. Two circular lock portion insertion holes 92 are formed (see FIGS. 5 and 9).

  When mounting the connecting tool 10, first, the locking parts 20 of the connecting tool 10 are inserted so as to be fitted into the locking part insertion holes 82 in the joint pipe 81 of the one leg column 80. Since the connecting tool 10 has elasticity, the width of the connecting tool 10 can be reduced by attaching the leg pieces 12 so as to be close to each other and can be mounted in the joint pipe 81. In this state, since the end of the misalignment prevention piece 13 is positioned outside the inner diameter of the joint pipe 81, the upper end of the joint pipe 81 is locked so as to be erected. The movement can be restricted and fixed.

  Next, the other pedestal (cylindrical tube) 90 is externally fitted so as to cover the joint tube 81 (FIG. 5 (a)), while being retracted into the joint tube 81 with both lock portions 20 interposed therebetween (FIG. 5). 5 (b)), a leg pillar (cylindrical pipe) 90 fitted on the joint pipe 81 slides, and the lock part 20 is fitted into each lock part insertion hole 92 of the leg pillar (cylindrical pipe) 90 ( 5 (c)), the lock portion 20 is held in a state of protruding outward from the position of the outer peripheral surface of the pedestal column (cylindrical tube) 90, so that the pedestals are connected to each other.

At this time, as shown in FIG. 6, a locking side 7 c inclined from the horizontal position to the leg piece side is formed in a portion near the leg piece 12 of the lock portion 20, so that a downward force ( Even when a pulling force is applied, the lock portion insertion hole 82 comes into contact with the locking side 7c by moving downward of the joint tube 81, and the lock portion 20 escapes to the inside of the joint tube 81. This prevents the connection and prevents the connection from being released (locked state). In addition, even when an upward force (extraction force) is applied to the pedestal 90, the lock portion insertion hole 92 comes to rest by contacting the lower side 7a (horizontal position) of the lock piece of the lock portion 20.
That is, when a force acts in a direction in which the pedestals are separated from each other in this state, the pedestal is not pulled out because the locked state is maintained.

Since the bent part 15 is formed in the leg piece 12 along the longitudinal direction, the overall strength of the connector 10 can be enhanced. That is, it is possible to prevent deformation of the shape of the lock portion 20 due to an impact at the time of connecting the cylindrical tubes, and to sufficiently secure the strength of the lock portion 20 when a force acts in a direction in which the pedestals are separated from each other. Therefore, the locked state can be reliably maintained.
Further, since the bent portion 15 is also formed at a position below the lock portion 20, this portion abuts against the inner diameter of the joint pipe 81 (FIGS. 5A and 5C), and the lock portion 20 is deformed to the outside. It is possible to exert an abutting action so as not to go to.

  At this time, the lock part 20 fitted in the lock part insertion holes 82 and 92 is inserted into the lock part insertion holes 82 and 92, as shown in FIGS. 5 (c), 8 (a) and 9. Lock pieces 7, 8 are located. In this state, when the pedestal (cylindrical tube) 90 is rotated clockwise (direction A in FIG. 9) (direction A in FIG. 7 when viewed from below), the lock piece 8 is inserted into the lock portion insertion hole 92. After coming into contact with the inner wall, the lock piece 7 comes into contact with the inner wall of the lock portion insertion hole 82 of the joint pipe 81 (FIG. 7A).

  Since the edge portion 7b is formed in the lock piece 7, the edge portion 7b is in contact with the wall surface of the lock portion insertion hole 82 and is not easily rotated further (see FIG. 9). In the clockwise rotation applied to the (cylindrical tube) 90, the pedestal (cylindrical tube) 90 can be prevented from coming off from the joint tube 81, and the locked state (the state shown in FIG. 7A) is maintained.

  When releasing the connection between the pedestals 80 and 90, the lock portion 20 is fitted in the lock portion insertion holes 82 and 92 of each pedestal column (cylindrical tube) (FIG. 5C, FIG. 8). When the pedestal (cylindrical tube) 90 is rotated in the counterclockwise direction (direction B in FIG. 9) (direction B in FIGS. 7 and 8 as viewed from below) from (a) and FIG. After the piece 7 comes into contact with the inner wall of the lock portion insertion hole 92, the curved portion 8b of the lock piece 8 comes into contact with the inner wall of the lock portion insertion hole 82 of the joint pipe 81 (FIG. 8B).

Further, when a rotational force in the B direction is applied to the pedestal column (cylindrical tube) 90, the curved portions 8b formed in a gentle shape slide on the inner wall surface of the lock portion insertion hole 82 so that the lock portions 20 approach each other. The space between the leg pieces 12 is narrowed, and the tip of the lock part 20 (the lock piece 7 and the lock piece 8) comes into contact with the inner wall of the leg column (cylindrical tube) 90 so that the lock part 20 is in the retracted state (FIG. 7B). And FIG. 8 (c)).
In this state, when the pedestal (cylindrical tube) 90 is pulled in the axial direction with respect to the joint (cylindrical tube) 81, the pedestal (cylindrical tube) 90 can be removed from the joint tube 81.

  According to the connector having the above structure, the connector 10 is fixed to one cylindrical tube 80 (joint tube 81) serving as a pedestal, and the other leg is covered so as to cover one cylindrical tube 80 (first cylindrical tube). When the column 90 (second cylindrical tube) is externally fitted and the cylindrical tubes are connected to each other, the lock portion 20 of the connector 10 is fitted into the lock portion insertion holes 82 and 92 provided in the cylindrical tubes. In addition, by configuring the lock portion 20 with a pair of lock pieces 7 and 8 connected to each bent portion 15, it is possible to secure sufficient strength with a simple structure and prevent deformation of the lock portion 20. it can.

  Further, since an edge portion 7b where two sides intersect is formed on the upper side of one lock piece 7, the lock portion 20 is inserted into the lock portion insertion hole 82 of the joint pipe 81, and the pedestal 90 (in the above example, the timepiece 7 When rotating around (A direction), the end of the lock portion insertion hole 82 of the joint pipe 81 is caught by the edge portion 7b and the rotation is restricted, and the lock portion 20 is prevented from performing the retreat operation. Further, it is possible to make a structure in which the pedestal 90 (second cylindrical tube) is not easily detached from the joint pipe 81 (first cylindrical tube) by the clockwise rotation of the pedestal 90.

  On the other hand, since the curved portion 8b having a gentle side is formed on the upper side of the other lock piece 8, when the connected state between the pedestal column 90 and the joint tube 81 is to be released, By rotating clockwise (B direction in FIGS. 7, 8 and 9), the end of the lock portion insertion hole 82 moves along the curved portion 8b, and the lock portion 20 can be retracted into the cylindrical tube. The leg column 90 can be easily detached from the joint tube 81 by pulling out the column 90 (second cylinder tube) in the vertical direction from the joint tube 81 (first cylindrical tube).

  In the above-described example, the curved portion 8b is formed only on the lock piece 8 on one side. However, both the lock pieces constituting the lock portion 20 are each formed with a curved portion without providing an edge portion. The structure can be easily detached from both the clockwise and counterclockwise rotations of the pedestal 90.

  Moreover, according to the said structure, since the lock | rock part 20 is formed by bending a metal piece (lock piece 7,8), the connection tool 10 can be integrally formed from one member, and a number of parts is reduced. There is an effect that it is reduced and the fabrication becomes easy.

It is a perspective explanatory view showing a connector of an example of an embodiment of the invention. It is plane explanatory drawing of the metal piece which shows the expansion | deployment state before bending and forming the coupling tool of FIG. The coupling tool of an example of embodiment of this invention is shown, and it is a perspective explanatory drawing which shows the state with which it attached to one pedestal. BRIEF DESCRIPTION OF THE DRAWINGS The coupling tool of an example of embodiment is shown, (a) is plane explanatory drawing, (b) is front explanatory drawing, (c) is side explanatory drawing. (A)-(c) is a cross-sectional explanatory drawing in the vertical plane which shows the connection process in the case of connecting a pedestal column using a connection tool. It is partial cross-sectional explanatory drawing in the vertical surface when the pillars are connected using a connector. (A) And (b) shows the connection state of the pillars using a connection tool, (a) is a locked state, (b) is sectional explanatory drawing in the horizontal surface which shows a cancellation | release state. (A) thru | or (c) are expanded sectional explanatory drawings which show the cancellation | release process in the case of canceling | releasing connection of pedestals. It is perspective explanatory drawing which shows a part in case a pedestal is connected using a connector. It is perspective explanatory drawing which shows the assembly structure in the case of connecting a pedestal column using the conventional connector.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Metal piece 7 Lock piece 7a Lower side 7b Edge part 7c Engagement side 7d Inclined side 7e Side 8 Lock piece 8a Lower side 8b Bending part 8c Upper side 8d Side 10 Connection tool 11 Base piece 12 Leg piece 13 Position shift prevention piece 15 Folding Bending part 20 Locking part 80 Pedestal (cylindrical tube)
81 Joint pipe 82 Lock part insertion hole 90 Leg column (cylindrical pipe)
92 Lock part insertion hole

Claims (2)

A connector integrally formed to have leg pieces at both ends by bending a metal piece into a U shape,
A base piece located in the center of the metal piece and spanning the leg pieces;
A misalignment prevention piece extending at both ends of the base piece by cutting and raising a part of the leg piece,
Each leg piece has a bent portion bent outward at both ends along the longitudinal direction thereof, and a locking portion having a protruding shape on the surface side of the leg piece at an upper position spaced from the lower end portion of the leg piece. Provided,
The lock part is composed of a pair of lock pieces that are connected to the bent portions of the leg pieces and are inclined toward the center of the leg pieces. About the lock piece formed on each leg piece, the upper side of one lock piece forms an edge part where two sides intersect, and the upper side of the other lock piece is formed so that the side is continuous, The connector according to claim 1, wherein one lock piece and the other lock piece are formed at the same position.

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