JP2016044407A - Connection structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connection structure that sufficiently enhances workability.SOLUTION: A connection structure according to an embodiment has a first square pipe and a second square pipe connected coaxially by a connecting member. The first square pipe has a support plate installed to cover an opening at an end of the first square pipe. A guide plate of the connecting member is installed on the support plate, the guide plate being housed inside the second square pipe in a connected state. A pair of hooks is installed on a surface of the guide plate, with an elastic material in between, the hooks being engaged to a pair of engaged parts formed on the second square pipe, when in a connected state. The guide plate is installed such that when in a closed state, a surface thereof fits along both the pipe axial direction and a first diagonal direction, along which a pair of corner parts face each other on both sides of the pipe axis. The pair of hooks is installed to lie along a second diagonal direction that intersects with the first diagonal direction.SELECTED DRAWING: Figure 1

Description

  Embodiments described herein relate generally to a connection structure.

  A connecting structure such as a frame is assembled by performing a connecting operation for connecting members such as a square steel pipe. In order to shorten the work time of the connecting work, it is required to improve workability. In particular, when performing joint work in an environment where the radiation dose is high at a nuclear power plant, protective clothing is necessary to reduce the total exposure dose, so the work is not easy, and there is a high demand for improved workability. .

  In order to meet the above requirements, various techniques have been proposed (see, for example, Patent Document 1).

  However, conventionally, there are cases where it is not possible to sufficiently improve workability and shorten work time in connection work. For example, when connecting work is performed by remote control in an environment with a high radiation dose such as a nuclear power plant, workability may not be sufficient and it may be difficult to realize a reduction in work time.

JP 2009-256968 A

  Therefore, the problem to be solved by the present invention is to provide a connection structure capable of sufficiently realizing improvement in workability and reduction in work time in connection work.

  The connection structure of the embodiment includes a first square tube, a second square tube, and a connection member, and the first square tube and the second square tube are coaxially connected by the connection member. The first rectangular tube is provided with a support plate so as to cover an opening located at one end. The connecting member has a guide plate and a pair of hooks. The guide plate is installed on the surface of the support plate so as to be accommodated in the second rectangular tube when the first rectangular tube and the second rectangular tube are connected. The pair of hooks are installed on the surface of the guide plate with an elastic member so as to engage with the pair of engaged portions formed on the second rectangular tube when in the connected state. Here, when the guide plate is in a connected state, the tube axis direction along the tube axis of the first rectangular tube and the second rectangular tube, and the pair of corner portions in the first rectangular tube and the second rectangular tube are tube axes. It is installed so that a surface may be along with both the 1st diagonal direction which faces through. And a pair of hook is installed so that it may line up along the 2nd diagonal direction which cross | intersects a 1st diagonal direction.

FIG. 1 is a perspective view showing a connection structure according to the first embodiment. FIG. 2 is a diagram illustrating a first rectangular tube in which a connection member is installed in the connection structure according to the first embodiment. FIG. 3 is a diagram illustrating a second rectangular tube in the connection structure according to the first embodiment. FIG. 4 is a diagram showing a state in which the first rectangular tube and the second rectangular tube are connected and combined in the connection structure according to the first embodiment. FIG. 5 is a perspective view showing a connection structure according to the second embodiment. FIG. 6 is a view showing a state in which both the first rectangular tube and the second rectangular tube are connected by a connecting member and combined in the connecting structure according to the second embodiment.

  Embodiments will be described with reference to the drawings.

<First Embodiment>
FIG. 1 is a perspective view showing a connecting structure 1 according to the first embodiment. FIG. 1 shows a state before connection.

  As shown in FIG. 1, the connection structure 1 includes a first rectangular tube 10 and a second rectangular tube 20. At the same time, the connecting structure 1 has a connecting member 30.

  In the connection structure 1, both the first rectangular tube 10 and the second rectangular tube 20 are connected coaxially by the connecting member 30. In the connecting structure 1, for example, the tube axis direction z along the tube axis AX of the first rectangular tube 10 and the second rectangular tube 20 is along the vertical direction so as to constitute a column of a frame (not shown). Connected.

  In the present embodiment, the connection structure 1 is detachable between the first rectangular tube 10 and the second rectangular tube 20. Although the details will be described later, in the connection structure 1, the connection member 30 is fixed to the first rectangular tube 10, and the connection member 30 is inserted into the second rectangular tube 20 to be engaged with the second rectangular tube 20. By stopping, the first rectangular tube 10 and the second rectangular tube 20 are connected. And in the connection structure 1, when the latching is cancelled | released, between the 1st square pipe | tube 10 and the 2nd square pipe | tube 20 leaves | separates.

  FIG. 2 is a diagram illustrating the first rectangular tube 10 in which the connection member 30 is installed in the connection structure 1 according to the first embodiment. Here, FIG. 2A shows the top surface, FIG. 2B shows one side surface, and FIG. 2C shows the other side surface.

  FIG. 3 is a diagram illustrating the second rectangular tube 20 in the connection structure 1 according to the first embodiment. Here, FIG. 3A shows the top surface, FIG. 3B shows one side surface, and FIG. 3C shows the other side surface.

  FIG. 4 is a diagram illustrating a state in which the first rectangular tube 10 and the second rectangular tube 20 are coupled by the coupling member 30 and combined in the coupling structure 1 according to the first embodiment. In FIG. 4, the second rectangular tube 20 is indicated by a two-dot chain line. 4A shows the top surface, FIG. 4B shows one side surface, and FIG. 4C shows the other side surface.

  Specifically, in FIG. 2A, FIG. 3A, and FIG. 4A, a horizontal plane (xy plane (D1-D2 plane) perpendicular to the tube axis direction z (vertical direction). )). 2 (b), 3 (b), and 4 (b), the first rectangular tube 10 and the second rectangular tube 20 constituting the connection structure 1 are paired via the tube axis AX. Among the two diagonal directions D1 and D2 that face the corners C10 and C20, a vertical plane (z-D2 plane) orthogonal to the first diagonal direction D1 is shown. And in FIG.2 (c), FIG.3 (c), and FIG.4 (c), the vertical surface (z-) orthogonal to 2nd diagonal direction D2 among two diagonal directions D1 and D2. D1 surface).

  Hereinafter, the details of each part constituting the connection structure 1 will be sequentially described with reference to each drawing.

  The first rectangular tube 10 is a tubular body, and a horizontal plane (xy plane) perpendicular to the tube axis AX has a regular square shape. The first square tube 10 is, for example, a square pipe (square steel tube) formed of steel.

  Specifically, the first rectangular tube 10 has four flat plate portions F10 and four corner portions C10 (see FIG. 2A). In the first rectangular tube 10, a pair of flat plate portions F <b> 10 face each other through an internal space in a first direction x along a plane (xy plane) perpendicular to the tube axis direction z. At the same time, in the first rectangular tube 10, the other pair of flat plate portions F <b> 10 occupy the internal space in the second direction y orthogonal to the first direction x among the surfaces (xy plane) perpendicular to the tube axis direction z. Face to face. In the first rectangular tube 10, each of the four corner portions C <b> 10 has an arc shape in cross section, and is positioned between each of the four flat plate portions F <b> 10.

  In the present embodiment, a support plate 11 is installed on the first rectangular tube 10. The support plate 11 has a plane along a horizontal plane (xy plane) orthogonal to the tube axis direction z (vertical direction). The support plate 11 is joined to one end of the first rectangular tube 10 so as to cover an opening located at one end (upper end) of the first rectangular tube 10. The support plate 11 is, for example, a regular quadrangular plate-like body made of steel and has a size larger than the width of the first rectangular tube 10. The support plate 11 is chamfered at a corner portion of a regular square shape.

  The support plate 11 is interposed between the first rectangular tube 10 and the second rectangular tube 20 when the first rectangular tube 10 and the second rectangular tube 20 are connected (see FIG. 1).

  The second rectangular tube 20 is a tubular body, and like the first rectangular tube 10, the cross-sectional shape of a plane (xy plane) perpendicular to the tube axis AX is the same as that of the first rectangular tube 10. It is a square shape. The second square tube 20 is, for example, a square pipe (square steel tube) formed of steel.

  Specifically, the second rectangular tube 20 has four flat plate portions F20 and four corner portions C20 as in the first rectangular tube 10 (see FIG. 3A). In the second rectangular tube 20, the pair of flat plate portions F20 face each other through the internal space in the first direction x, and the other pair of flat plate portions F20 face each other through the internal space in the second direction y. ing. And each of the four corner parts C20 is located between each of the four flat plate parts F20.

  In the present embodiment, the second rectangular tube 20 is provided with a pair of engaged portions K20. Here, the pair of engaged portions K <b> 20 are through holes that penetrate the tube wall of the second rectangular tube 20. Each of the pair of engaged portions K20 is formed in each of the pair of corner portions C20 arranged in the second diagonal direction D2 in the second rectangular tube 20.

  When the connecting member 30 is inserted into the second rectangular tube 20 in order to connect the first rectangular tube 10 and the second rectangular tube 20, the pair of engaged portions K <b> 20 are engaged with the connecting member 30. Stop (see FIG. 1).

  The connection member 30 is formed using metal materials, such as steel, for example. As described above, the connecting member 30 is a locking mechanism, and is inserted into the second rectangular tube 20 and locked to the second rectangular tube 20, whereby the first rectangular tube 10 and the second rectangular tube 20. And both are configured to be connected coaxially.

  Specifically, the connecting member 30 includes a guide plate 31, a pair of hooks 32, a pair of elastic members 33, and a fixed plate 34. In the first diagonal direction D <b> 1 and the second diagonal direction D <b> 2, each part of the connecting member 30 is arranged so as to be line symmetric with respect to the tube axis AX.

  In the connecting member 30, the guide plate 31 is installed on the surface (upper surface) of the support plate 11. The guide plate 31 is a plate-like body formed of, for example, a metal material such as steel, and one end (lower end) is joined to the support plate 11 by welding, for example.

  In the present embodiment, the guide plate 31 is disposed on the surface of the support plate 11 so that the surface stands along the tube axis direction z of the first rectangular tube 10. At the same time, the guide plate 31 is disposed on the surface of the support plate 11 so that the pair of corner portions C10 of the first rectangular tube 10 stands along the first diagonal direction D1 facing each other via the tube axis AX. . That is, the surface of the guide plate 31 is along a vertical plane (z-D1 plane) orthogonal to the second diagonal direction D2.

  A portion of the guide plate 31 that is close to the support plate 11 has a constant width defined by the first diagonal direction D1, and a width defined by the first diagonal direction D1 inside the second rectangular tube 20. Narrower than. The width of the portion of the guide plate 31 close to the support plate 11 can be arbitrarily set according to the degree of allowable deformation in the connection structure 1 that is a frame (not shown).

  On the other hand, a portion of the guide plate 31 that is far from the support plate 11 is narrower as the width defined in the first diagonal direction D1 is separated from the support plate 11. In the guide plate 31, the other end (upper end) located on the opposite side to the one end (lower end) fixed to the support plate 11 has a curved surface shape. That is, the guide plate 31 has a tapered tip portion (upper end portion) that becomes thinner from one end (lower end) side fixed to the support plate 11 toward the other end (upper end). For example, the taper angle is formed to be 30 °.

  Further, the guide plate 31 is formed with a through hole K31. The through hole K31 has, for example, a circular shape and penetrates the guide plate 31 in the second diagonal direction D2. For example, a member such as a wire is inserted into the through hole K31 when a lifting operation or the like is performed.

  The guide plate 31 guides the second rectangular tube 20 when the connecting member 30 is inserted into the second rectangular tube 20 in order to connect the first rectangular tube 10 and the second rectangular tube 20. That is, when the guide plate 31 is connected, the second rectangular tube 20 is guided so that the direction in which the pair of hooks 32 are aligned and the direction in which the pair of engaged portions K20 are aligned with each other. The guide plate 31 is accommodated inside the second rectangular tube 20 when the first rectangular tube 10 and the second rectangular tube 20 are connected (see FIG. 1).

  In the connecting member 30, the pair of hooks 32 are plate-like bodies formed of a metal material such as steel, for example.

  Each of the pair of hooks 32 is installed on each surface of the guide plate 31 with an elastic member 33 interposed therebetween. Each of the pair of hooks 32 is installed on one end (lower end) side of the guide plate 31 close to the support plate 11.

  Of the pair of hooks 32, one hook 32 is installed on one surface of the guide plate 31. At the same time, the other hook 32 is installed on the other surface of the guide plate 31. That is, the pair of hooks 32 are installed so as to be aligned along the second diagonal direction D2 that intersects the first diagonal direction D1.

  Each of the pair of hooks 32 is provided to be inclined with respect to the surface of the guide plate 31. Specifically, the surface S32 of the pair of hooks 32 that is located outside in the second diagonal direction D2 is such that the one end (lower end) side near the support plate 11 is the surface of the guide plate 31 than the other end (upper end) side. Inclined so that it is located away from The angle at which each of the pair of hooks 32 is inclined with respect to the surface of the guide plate 31 is, for example, in the range of 35 ° to 75 °, and preferably in the range of 45 ° to 60 °. When the inclination angle exceeds 75 °, the length of the surface S32 of the pair of hooks 32 becomes long, so that buckling may occur when a pulling load is applied. In addition, when the pair of hooks 32 is made of a member that does not easily buckle, the spring force increases, so that removal may not be easy. Furthermore, the entire hook 32 needs to be enlarged. On the other hand, when the inclination angle is smaller than 30 °, the bending moment becomes dominant when a pulling load is applied, and thus the pair of hooks 32 may be bent. Further, when the pair of hooks 32 is made of a member that is not easily bent, the spring force becomes large, so that the removal may not be easy. In this case, the entire hook 32 can be reduced, but the resistance to bending moment is reduced.

  In addition, a surface (lower surface) perpendicular to the tube axis direction z is formed at one end (lower end) near the support plate 11 in the pair of hooks 32. At one end (lower end) of the pair of hooks 32, the surface (lower surface) perpendicular to the tube axis direction z is separated from the surface (upper surface) of the support plate 11.

  The pair of hooks 32 engage with a pair of engaged portions K20 formed on the second rectangular tube 20 when the first rectangular tube 10 and the second rectangular tube 20 are connected (see FIG. 1). Specifically, when the first rectangular tube 10 and the second rectangular tube 20 are connected, one end (lower end) of the pair of hooks 32 close to the support plate 11 is locked to the pair of engaged portions K20. Here, when the hook 32 is locked to the engaged portion K20, one end of the hook 32 close to the support plate 11 coincides with the outer peripheral surface of the second rectangular tube 20 (see FIG. 4B).

  In the connecting member 30, each of the pair of elastic members 33 is interposed between the guide plate 31 and the hook 32.

  In the present embodiment, the elastic member 33 is a leaf spring, for example, and is formed using a metal material such as steel. Here, the elastic member 33 includes a fixed portion 331, a connecting portion 332, and a hook support portion 333.

  Of the elastic member 33, the fixed portion 331 has a surface along the tube axis direction z (vertical direction) and the first diagonal direction D <b> 1, and is fixed to the surface of the guide plate 31, similarly to the guide plate 31. . The fixed portion 331 is joined to the guide plate 31 by, for example, screw joining using a bolt or the like.

  Of the elastic member 33, the connecting portion 332 has a surface along a horizontal plane (xy plane) orthogonal to the tube axis direction z (vertical direction), like the support plate 11. The support part 333 is connected. Here, the connecting portion 332 is interposed between one end (upper end) of the fixing portion 331 and one end (upper end) of the hook support portion 333.

  Of the elastic member 33, the hook support portion 333 is inclined with respect to the tube axis direction z like the hook 32, and supports the hook 32 with the inclined surface. For example, the hook support part 333 is joined to the hook 32 by welding or the like.

  The pair of elastic members 33 are deformed when the connecting member 30 is inserted into the second rectangular tube 20 in order to connect the first rectangular tube 10 and the second rectangular tube 20. And when a connection member 30 latches to the 2nd rectangular tube 20, a pair of elastic member 33 will cancel the deformation | transformation, and will return to the state before a deformation | transformation (refer FIG. 1).

  In the connecting member 30, the fixed plate 34 is installed on the surface (upper surface) of the support plate 11. The fixed plate 34 is a plate-like body formed of, for example, a metal material such as steel, and one end (lower end) is joined to the support plate 11 by welding, for example. The fixed plate 34 is joined to the guide plate 31 by welding, for example, and fixes the guide plate 31 to the support plate 11.

  The fixed plate 34 is installed so that the surface is along both the tube axis direction z along the tube axis AX of the first rectangular tube 10 and the second diagonal direction D2. That is, the fixed plate 34 is provided so that the plane intersects the guide plate 31.

  When the first rectangular tube 10 and the second rectangular tube 20 are connected to each other, the fixed plate 34 is housed inside the second rectangular tube 20 together with the guide plate 31 (see FIG. 1).

  A method for attaching and detaching the first rectangular tube 10 and the second rectangular tube 20 will be described. Here, a case where an upper structure (not shown) having the second rectangular tube 20 is attached to a lower structure (not shown) having the first square tube 10 and a case where the upper structure is removed from the lower structure are described. Illustrate.

  When performing the above attachment, first, the upper structure is moved so that the second rectangular tube 20 is positioned above the upper surface of the first rectangular tube 10 of the lower structure where the connecting member 30 is installed. . At this time, the position where the direction in which the pair of hooks 32 are arranged in the connecting member 30 installed in the first rectangular tube 10 and the direction in which the pair of engaged portions K20 are arranged in the second rectangular tube 20 coincide with each other. Matching is performed (see FIG. 1).

  Next, the upper structure is moved downward to bring the second rectangular tube 20 closer to the first rectangular tube 10. Here, the upper end portion of the guide plate 31 of the connecting member 30 is inserted into the inside from the opening located at the lower end of the second rectangular tube 20 (see FIG. 1).

  Next, the second rectangular tube 20 is connected to the first rectangular tube 10 by moving the upper structure further downward using its own weight. At this time, in the present embodiment, the second rectangular tube 20 is guided by the guide plate 31 so that the direction in which the pair of hooks 32 are aligned and the direction in which the pair of engaged portions K20 are aligned with each other. Then, by moving the second rectangular tube 20 further downward in this state, each of the pair of hooks 32 is engaged with each of the pair of engaged portions K20.

  Specifically, when the connecting member 30 is inserted into the second rectangular tube 20, the pair of hooks 32 and the second rectangular tube 20 come into contact with each other. By this contact, the lower ends of the pair of hooks 32 move inward in the second diagonal direction D2, and the pair of elastic members 33 are deformed inward in the second diagonal direction D2. When the second rectangular tube 20 moves further downward and reaches a position where the pair of hooks 32 are locked to the pair of engaged portions K20, the deformation of the pair of elastic members 33 is released. By releasing this deformation, the lower ends of the pair of hooks 32 move outward in the second diagonal direction D2 and fit into the pair of engaged portions K20. In this way, the connecting member 30 is engaged with the second rectangular tube 20, thereby connecting the first rectangular tube 10 and the second rectangular tube 20.

  When detaching, first, the lower ends of the pair of hooks 32 locked to the pair of engaged portions K20 are pushed and moved inward. Thereby, the state in which the connecting member 30 is locked to the second rectangular tube 20 is released.

  Next, the upper structure is moved upward in a state where the locking is released. As a result, the second rectangular tube 20 can be removed from the first rectangular tube 10.

  As described above, the connection structure 1 of the present embodiment is configured by coaxially connecting the first rectangular tube 10 and the second rectangular tube 20 by the connecting member 30. Here, the guide plate 31 constituting the connecting member 30 has a pair of corner portions C10 and C20 via the tube axis AX when the first rectangular tube 10 and the second rectangular tube 20 are connected. It is along the first diagonal direction D1 facing each other. And a pair of hook 32 which comprises the connection member 30 is located in a line along the 2nd diagonal direction D2 which cross | intersects the 1st diagonal direction D1. The pair of hooks 32 are inclined with respect to the tube axis direction z so that one end side near the support plate 11 is located farther from the surface of the guide plate 31 than the other end side. In the connected state, one end of the pair of hooks 32 engages with the pair of engaged portions K <b> 20 formed on the second rectangular tube 20. For this reason, in this embodiment, when connecting the 1st square pipe | tube 10 and the 2nd square pipe | tube 20, it is possible to match | combine both positions with the guide plate 31 easily.

  In particular, in the present embodiment, the distal end portion (upper end portion) of the guide plate 31 is formed so as to become thinner from one end (lower end) side fixed to the support plate 11 toward the other end (upper end). . For this reason, for example, also when performing said connection operation by remote operation, the front-end | tip part of the guide plate 31 can be easily inserted in the inside of the 2nd rectangular tube 20. FIG.

  Therefore, in this embodiment, it is possible to sufficiently improve the workability and shorten the work time with respect to the connecting work. As a result, when the connection work is performed in an environment where the radiation dose is high at the nuclear power plant, work such as welding work or bolting work is unnecessary, and thus the total exposure dose can be reduced.

  Further, in the second rectangular tube 20 of the present embodiment, the pair of engaged portions K <b> 20 are formed so as to penetrate the tube wall of the second rectangular tube 20. For this reason, the locked state can be released by pushing one end of the pair of hooks 32 locked to the pair of engaged portions K20 and moving them inward. As a result, in the connection structure 1 of the present embodiment, the space between the first rectangular tube 10 and the second rectangular tube 20 can be made detachable.

  In the above-described embodiment, the case where each part constituting the connection structure 1 is formed of a metal material such as steel has been described. However, the present invention is not limited to this. Each part may be formed of a material other than a metal material such as plastic.

  In the above embodiment, the case where the first rectangular tube 10 and the second rectangular tube 20 are detachable has been described. However, the present invention is not limited to this. And when not making it detachable between both, it is not necessary for a pair of to-be-engaged part K20 to penetrate the tube wall of the 2nd square tube 20. FIG. In this case, the pair of engaged portions K20 may be grooves formed on the inner surface of the second rectangular tube 20.

  In the above embodiment, the front end portion (upper end portion) of the guide plate 31 becomes thinner from the one end (lower end) side fixed to the support plate 11 toward the other end (upper end), but is not limited thereto. Absent. For example, the guide plate 31 may have a constant width defined in the first diagonal direction D1.

  In the above embodiment, one end of the hook 32 close to the support plate 11 is configured to coincide with the outer peripheral surface of the second rectangular tube 20 when the hook 32 is locked to the engaged portion K20. However, it is not limited to this. For example, the hook 32 is configured such that one end of the hook 32 close to the support plate 11 protrudes outward from the outer peripheral surface of the second rectangular tube 20 when the hook 32 is locked to the engaged portion K20. Also good. In addition, when the hook 32 is locked to the engaged portion K20, the area of the surfaces that contact each other can be arbitrarily set. For example, the plate thickness of the hook 32 can be arbitrarily set.

  In the above embodiment, the case where the elastic member 33 is a leaf spring has been described, but the present invention is not limited to this. For example, another elastic body such as a coil spring may be used as the elastic member 33.

  In the above embodiment, the first rectangular tube 10 and the second rectangular tube 20 are connected so that the tube axis AX is along the vertical direction, but the present invention is not limited to this. The tube axes AX of the first rectangular tube 10 and the second rectangular tube 20 may be coupled along a horizontal direction orthogonal to the vertical direction.

  In the above embodiment, the connecting structure 1 is joined by the connecting member 30 fixed to the first rectangular tube 10 being inserted into the second rectangular tube 20 and being locked to the second rectangular tube 20. However, it is not limited to this. As needed, you may join between the 1st square pipe | tube 10 and the 2nd square pipe | tube 20 by combining other joining methods, such as welding.

  In the above embodiment, the first rectangular tube 10 and the second rectangular tube 20 have been described with respect to the case where the horizontal plane (xy plane) perpendicular to the tube axis AX has a regular square shape. Not limited to. The first rectangular tube 10 and the second rectangular tube 20 may have a cross-sectional shape that is not a regular square shape but a rectangular shape.

Second Embodiment
FIG. 5 is a perspective view showing a connection structure 1b according to the second embodiment. FIG. 5 shows a state before connection as in FIG.

  As shown in FIG. 5, the connecting structure 1 b includes a first rectangular tube 10 b and a second rectangular tube 20. At the same time, the connecting structure 1b has a connecting member 30b. In the connection structure 1b, both the first rectangular tube 10b and the second rectangular tube 20 are coaxially connected by the connecting member 30b. Further, the connecting structure 1b is detachable between the first rectangular tube 10b and the second rectangular tube 20.

  However, as can be seen from FIG. 5, in the present embodiment, a part of the configuration of the first rectangular tube 10b is different from the case of the first embodiment described above. Moreover, the structure of the connection member 30b differs from the case of 1st Embodiment mentioned above. This embodiment is the same as the case of the first embodiment except for the above points and related points. For this reason, in the present embodiment, the description overlapping with the case of the first embodiment is omitted as appropriate.

  In the present embodiment, the connection structure 1b is different from the first embodiment in that the connection member 30b is a joint, and the connection member 30b is not fixed to the first rectangular tube 10b. In the present embodiment, the connecting member 30b is inserted into and engaged with each of the first rectangular tube 10b and the second rectangular tube 20, whereby the gap between the first rectangular tube 10b and the second rectangular tube 20 is established. Connected. And in the connection structure 1b, the 1st square pipe | tube 10b and the 2nd square pipe | tube 20 leave | separate by releasing the latching | locking.

  FIG. 6 is a diagram showing a state in which both the first rectangular tube 10b and the second rectangular tube 20 are connected and combined by the connecting member 30b in the connecting structure 1b according to the second embodiment. In FIG. 6, as in the case of FIG. 4, the second rectangular tube 20 is indicated by a two-dot chain line. Here, FIG. 6A shows one side surface as in FIG. 4B, and FIG. 6B shows the other side surface as in FIG. 4C. Since the upper surface and the lower surface are the same as those in FIG. 4A, illustration is omitted.

  Hereinafter, the details of each part constituting the connection structure 1b will be sequentially described with reference to each drawing.

  As in the first embodiment, the first rectangular tube 10b is a tubular body, and the cross-sectional shape of a horizontal plane (xy plane) perpendicular to the tube axis AX is a regular square shape.

  In the present embodiment, the first rectangular tube 10 b is provided with a pair of engaged portions K <b> 10, similarly to the second rectangular tube 20. Here, each of the pair of engaged portions K10 is formed in each of the pair of corner portions C10 arranged in the second diagonal direction D2 in the first rectangular tube 10b.

  When the connecting member 30b is inserted into the first rectangular tube 10b, the connecting member 30b is engaged with the pair of engaged portions K10 (see FIG. 5).

  The connecting member 30b has a support plate 11b. The connecting member 30b includes a first guide plate 31A, a pair of first hooks 32A, a pair of first elastic members 33A, and a first fixing plate 34A. At the same time, the connecting member 30b includes a second guide plate 31B, a pair of second hooks 32B, a pair of second elastic members 33B, and a first fixing plate 34B. In the first diagonal direction D1 and the second diagonal direction D2, the connecting member 30b is arranged such that each part is line-symmetric with respect to the tube axis AX as the axis of symmetry. Furthermore, each part is comprised so that the connection member 30b may become plane symmetry by using the support plate 11b as a symmetry plane.

  As in the first embodiment, the support plate 11b is, for example, a regular tetragonal plate-like body made of steel, and has a size larger than the width of the first rectangular tube 10b. The support plate 11 is chamfered at a corner portion of a regular square shape.

  The support plate 11b is interposed between the first rectangular tube 10b and the second rectangular tube 20 when the first rectangular tube 10b and the second rectangular tube 20 are connected (see FIG. 5).

  The first guide plate 31A is installed on one surface (lower surface) of the support plate 11b. As in the case of the first embodiment, the first guide plate 31A is installed on the support plate 11b so as to stand along the tube axis direction z and the first diagonal direction D1. That is, the surface of the first guide plate 31A is along a vertical plane (z-D1 plane) orthogonal to the second diagonal direction D2.

  In addition, the first guide plate 31A is formed such that the tip end portion (lower end portion) becomes thinner from one end (upper end) side fixed to the support plate 11b toward the other end (lower end). Further, the first guide plate 31A has a through hole K31A.

  The first guide plate 31A is housed inside the first rectangular tube 10b when in the connected state (see FIG. 5).

  As in the case of the first embodiment, the pair of first hooks 32A is installed on each surface of the first guide plate 31A with the first elastic member 33A interposed therebetween. The pair of first hooks 32A is installed so as to be aligned along a second diagonal direction D2 intersecting the first diagonal direction D1. Each of the pair of first hooks 32A is provided to be inclined with respect to the surface of the first guide plate 31A.

  The pair of first hooks 32A engages with the pair of engaged portions K10 formed on the first rectangular tube 10b when in the connected state (see FIG. 5).

  Each of the pair of first elastic members 33A is interposed between the first guide plate 31A and the first hook 32A. In the present embodiment, the first elastic member 33A is a leaf spring, for example, as in the first embodiment, and is formed using a metal material such as steel.

  The pair of first elastic members 33A is deformed when the connecting member 30b is inserted into the first rectangular tube 10b. Then, when the connecting member 30b is locked to the first rectangular tube 10b, the pair of first elastic members 33A is released from the deformation and returns to the state before the deformation (see FIG. 5).

  The first fixed plate 34A is installed on the surface (lower surface) of the support plate 11b. As in the case of the first embodiment, the first fixed plate 34A is installed so that the surface is along both the tube axis direction z and the second diagonal direction D2. That is, the first fixed plate 34A is provided so that the surface intersects the first guide plate 31A.

  When in the connected state, the first fixed plate 34A is housed inside the first rectangular tube 10b together with the first guide plate 31A (see FIG. 5).

  The second guide plate 31B is installed on the other surface (upper surface) of the support plate 11b. Similarly to the first guide plate 31A, the second guide plate 31B is installed on the support plate 11b so as to stand along the tube axis direction z and the first diagonal direction D1. That is, the surface of the second guide plate 31B is along a vertical plane (z-D1 plane) orthogonal to the second diagonal direction D2.

  Further, the second guide plate 31B is formed such that the tip end portion (upper end portion) becomes thinner from the one end (lower end) side fixed to the support plate 11b toward the other end (upper end). Further, the second guide plate 31B is formed with a through hole K31B.

  The second guide plate 31B is housed inside the second rectangular tube 20 when in the connected state (see FIG. 5).

  The pair of second hooks 32B is disposed on each surface of the second guide plate 31B with the second elastic member 33B interposed therebetween. Like the pair of first hooks 32A, the pair of second hooks 32B are arranged so as to be aligned along the second diagonal direction D2 that intersects the first diagonal direction D1. Each of the pair of second hooks 32B is provided to be inclined with respect to the surface of the second guide plate 31B.

  The pair of second hooks 32B engage with a pair of engaged portions K20 formed on the second rectangular tube 20 when in the connected state (see FIG. 5).

  Each of the pair of second elastic members 33B is interposed between the second guide plate 31B and the second hook 32B. In the present embodiment, the second elastic member 33A is a leaf spring, for example, as in the first embodiment, and is formed using a metal material such as steel.

  The pair of second elastic members 33 </ b> B are deformed when the connecting member 30 b is inserted into the second rectangular tube 20. Then, when the connecting member 30b is locked to the second rectangular tube 20, the pair of second elastic members 33B is released from the deformation and returns to the state before the deformation (see FIG. 5).

  The second fixed plate 34B is installed on the surface (upper surface) of the support plate 11b. Similarly to the case of the first fixed plate 34A, the second fixed plate 34B is installed so that the surface is along both the tube axis direction z and the second diagonal direction D2. That is, the second fixed plate 34B is provided so that the surface intersects the second guide plate 31B.

  When in the connected state, the second fixed plate 34B is housed inside the second rectangular tube 20 together with the second guide plate 31B (see FIG. 5).

  As described above, the connecting structure 1b of the present embodiment is configured by coaxially connecting both the first rectangular tube 10b and the second rectangular tube 20 with the connecting member 30b. Here, in the connecting member 30b, the first guide plate 31A and the second guide plate 31B are configured in the same manner as in the first embodiment. Further, each of the pair of first hooks 32A and the pair of second hooks 32B is configured in the same manner as in the first embodiment. For this reason, in this embodiment, when connecting the 1st square pipe | tube 10b and the 2nd square pipe | tube 20, it is possible to match | combine both positions easily.

  Therefore, in the present embodiment, as in the case of the first embodiment, it is possible to sufficiently improve the workability and shorten the work time for the connection work.

<Others>
Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 ... Connection structure, 1b ... Connection structure, 10 ... 1st square tube, 10b ... 1st square tube, 11 ... Support plate, 11b ... Support plate, 20 ... 2nd square tube, 20b ... 2nd square tube, DESCRIPTION OF SYMBOLS 30 ... Connection member, 30b ... Connection member, 31 ... Guide plate, 31A ... 1st guide plate, 31B ... 2nd guide plate, 32 ... Hook, 32A ... 1st hook, 32B ... 2nd hook, 33 ... Elastic member, 33A ... first elastic member, 33B ... second elastic member, 34 ... fixed plate, 34A ... first fixed plate, 34B ... second fixed plate, 331 ... fixed portion, 332 ... connecting portion, 333 ... hook support portion, AX ... pipe axis, C10 ... corner part, C20 ... corner part, D1 ... first diagonal direction, D2 ... second diagonal direction, F10 ... flat plate part, F20 ... flat plate part, K10 ... engaged part, K20 ... covered Engagement part, K 1 ... through hole, K31A ... through hole, K31B ... through hole, z ... tube axis direction

Connecting structure of embodiment, a connecting member and first rectangular pipe and the second square tube, the first square tube and the second rectangular tube is connected to the thus coaxially to the connecting member. The first rectangular tube is provided with a support plate so as to cover an opening located at one end. The connecting member has a guide plate and a pair of hooks. The guide plate is installed on the surface of the support plate so as to be accommodated in the second rectangular tube when the first rectangular tube and the second rectangular tube are connected. The pair of hooks are installed on the surface of the guide plate with an elastic member so as to engage with the pair of engaged portions formed on the second rectangular tube when in the connected state. Here, when the guide plate is in a connected state, the tube axis direction along the tube axis of the first rectangular tube and the second rectangular tube, and the pair of corner portions in the first rectangular tube and the second rectangular tube are tube axes. It is installed so that a surface may be along with both the 1st diagonal direction which faces through. And a pair of hook is installed so that it may line up along the 2nd diagonal direction which cross | intersects a 1st diagonal direction.

Each of the pair of hooks 32 is provided to be inclined with respect to the surface of the guide plate 31. Specifically, of the pair of hooks 32, the surface S32 located outside in the second diagonal direction D2 is such that the one end (lower end) side near the support plate 11 is closer to the other end (upper end) side than the other end (upper end) side. Inclined so that it is located away from The angle at which each of the pair of hooks 32 is inclined with respect to the surface of the guide plate 31 is, for example, in the range of 35 ° to 75 °, and preferably in the range of 45 ° to 60 °. When the inclination angle is smaller than 30 °, the length of the surface S32 of the pair of hooks 32 becomes long, so that buckling may occur when a pulling load is applied. In addition, when the pair of hooks 32 is made of a member that does not easily buckle, the spring force increases, so that removal may not be easy. Furthermore, the entire hook 32 needs to be enlarged. On the other hand, when the inclination angle exceeds 75 ° , the bending moment becomes dominant when a pulling load is applied, and thus the pair of hooks 32 may be bent. In addition, when the pair of hooks 32 is made of a member that is unlikely to be bent, the spring force is increased, so that removal may not be easy. In this case, the entire hook 32 can be reduced, but the resistance to bending moment is reduced.

As in the first embodiment, the support plate 11b is, for example, a regular tetragonal plate-like body made of steel, and has a size larger than the width of the first rectangular tube 10b. The supporting plate 11 b, the chamfering processing is given for a square-shaped corner portion.

Claims (10)

A connection structure comprising a first square tube, a second square tube, and a connecting member, wherein the first square tube and the second square tube are coaxially connected by the connecting member,
The first square tube is
A support plate installed to cover the opening located at one end;
The connecting member is
A guide plate installed on a surface of the support plate so as to be accommodated in the second rectangular tube when the first rectangular tube and the second rectangular tube are connected to each other;
A pair of hooks installed on the surface of the guide plate with an elastic member so as to engage with a pair of engaged portions formed on the second rectangular tube in the connected state; Have
When the guide plate is in the connected state, the guide plate includes a tube axis direction along a tube axis of the first square tube and the second square tube, and a pair of corner portions in the first square tube and the second square tube. Is installed so that the surface is along both the first diagonal direction facing through the tube axis,
The pair of hooks are installed so as to be aligned along a second diagonal direction intersecting the first diagonal direction.
Connected structure. The surface of the pair of hooks located outside in the second diagonal direction is arranged in the tube axis direction so that one end near the support plate is located farther from the surface of the guide plate than the other end. Is inclined with respect to
The pair of hooks are configured such that one end close to the support plate is locked to the pair of engaged portions.
The connection structure according to claim 1. The pair of engaged portions are provided so as to be positioned at each of the pair of corner portions arranged in the second diagonal direction in the second rectangular tube in the connected state,
The connection structure according to claim 1 or 2. The connecting member is
A fixing plate that is installed on the support plate and fixes the guide plate to the support plate;
The fixed plate is installed so that the surface is along both the tube axis direction along the tube axis of the first rectangular tube and the second diagonal direction.
The connection structure according to any one of claims 1 to 3. The guide plate includes a portion whose width defined in the first diagonal direction becomes narrower as the distance from the support plate increases.
The connection structure according to any one of claims 1 to 4. The pair of engaged portions are formed so as to penetrate the tube wall of the second rectangular tube.
The connection structure according to any one of claims 1 to 5. When the pair of hooks are locked to the pair of engaged portions, one end close to the support plate among the surfaces positioned on the outer side in the second diagonal direction is the outer periphery of the second rectangular tube. Configured to match the face,
The connection structure according to any one of claims 1 to 6. The guide plate is formed with a through hole,
The connection structure according to any one of claims 1 to 7. The elastic member is a leaf spring.
The connection structure according to any one of claims 1 to 8. A connection structure comprising a first square tube, a second square tube, and a connecting member, wherein the first square tube and the second square tube are coaxially connected by the connecting member,
The connecting member is
A support plate;
A first guide plate received in the first rectangular tube when the first rectangular tube and the second rectangular tube are connected to each other;
A pair of first elastic members interposed on the surface of the first guide plate and engaged with a pair of first engaged portions formed in the first rectangular tube in the connected state. A second guide plate housed in the second rectangular tube when in the connected state,
A pair of second elastic members disposed on the surface of the second guide plate and engaged with a pair of second engaged portions formed in the second rectangular tube when in the connected state. The second hook and
When the first guide plate and the second guide plate are in the connected state, the first guide plate and the second guide plate have a tube axis direction along a tube axis of the first square tube and the second square tube, and the first square tube and the second guide plate. A pair of corners in the square tube is installed on the surface of the support plate so that the surface stands along both the first diagonal direction facing the tube axis.
Each of the pair of first hooks and the pair of second hooks is installed so as to be aligned in a second diagonal direction intersecting the first diagonal direction when in the connected state.
Connected structure.

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