JP2014201941A - Joint structure for tube body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joint structure for a tube body that is inexpensive and has superior design.SOLUTION: A joint structure for a tube body that joins a first tube body 23 and a second tube body 25 together such that an end of the second tube body 25 abuts on an intermediate part of the first tube body 23 from the outside of its radial direction includes a bracket 31 which has one end side fastened to a wall surface of the first tube body 23, and the end of the second tube body 25 is fitted and fixed to the other end side of the bracket 31 fastened to the side of the first tube body 23. With the joint structure, thermal strain generated when the first tube body 23 and second tube body 25 are joined by welding is not generated, so subsequent strain removal processing is unnecessary, operability of joining operation is improved to make joining costs lower, and a tube body joint body as a product, for example, a handrail is improved in shape-related precision and reliability.

Description

  The present invention relates to a joining structure of tubular bodies used for a handrail device, for example.

  Normally, a handrail device is configured by appropriately joining a tubular body such as a circular pipe into a shape. In this case, a welding method has been generally used as a joining method for a tubular body (for example, Patent Document 1, Patent Document 2). However, according to this welding method, thermal distortion due to welding heat is generated in the vicinity of the welded portion, and it is necessary to perform distortion removal processing as post-processing. In particular, the handrail device tends to have large thermal strain due to the use of a thin circular tube as its material, and when a small-diameter circular tube is inserted into the welded circular tube to form a telescopic structure. In order to ensure the smoothness of its expansion and contraction, the welded and joined pipes require high roundness and straightness. It also contributed to the rise of.

  Moreover, although the bracket construction method which joins circular pipes using an exclusive bracket is also proposed (for example, refer patent document 2), in such a joining construction method, a bracket is exposed outside and a circular pipe and a bracket are connected. Since there is a step at the border, there is a problem that the design as a handrail is poor and the product value is lowered.

  In view of such circumstances, a technique has been proposed in which circular pipes are joined to each other by a fastening method regardless of the welding method (for example, see Patent Document 3).

  The fastening method shown in Patent Document 3 is to insert a bush into one circular pipe when joining the end of the other circular pipe to the side surface of one circular pipe in a T-shape in a butted state, A bottomed cylindrical joint is disposed on the outer surface side of the one circular pipe so as to correspond to the bush, and the joint and the bush facing each other with the peripheral wall of the one circular pipe interposed therebetween are fixed with screws.

  On the other hand, a threaded portion is provided in the end of the other circular tube, and after the end of the other circular tube is fitted into the joint on the one circular tube side, the one circular tube is A bolt inserted through the bush from the outer surface side to the other circular tube side is screwed into a threaded portion in the other circular tube and tightened to tighten the other circle on the side surface of the one circular tube. The end of the tube is fastened and fixed.

JP 2011-10853 A JP 2012-87507 A JP 2003-97006 A

  However, according to this fastening method, ex-post distortion treatment like the welding method is unnecessary, and the deterioration of the design property due to the exposure of the bracket as in the bracket method can be suppressed, but there are the following problems. there were.

  That is, a bush and a joint are provided on one circular pipe side, and a screw part is provided on the other circular pipe side, and a bolt for fastening between the bush and the screw part is required. The joining cost is high.

  Moreover, it is necessary to provide the bolt insertion hole on the side surface of one of the circular pipes, and the presence of the hole deteriorates the design, although not as much as in the bracket method.

  Furthermore, since there is a bush in one of the circular tubes, a separately prepared circular tube cannot be inserted into the circular tube to make an expandable structure, and the functionality of the handrail is limited, and as a result, a product as a handrail This leads to a decline in value.

  Accordingly, the present invention has been made for the purpose of proposing a tube joint structure that is inexpensive and excellent in design.

  In the present invention, the following configuration is adopted as a specific means for solving such a problem.

  In the first invention of the present application, the first tubular body and the second tubular body are placed in a state in which the end portion of the second tubular body is abutted against the intermediate portion of the first tubular body from the outside in the radial direction. In the joining structure of tubular bodies to be joined, one end side includes a bracket fastened to the wall surface of the first tubular body, and a second pipe is attached to the other end side of the bracket fastened to the first tubular body side. It is characterized by fitting and fixing the end of the body.

  According to a second invention of the present application, in the tubular body joining structure according to the first invention, the bracket is in contact with a peripheral surface of the first tubular body, and the first pipe is provided. A fixing portion that is fastened to the wall surface of the body, and a fitting insertion portion that is inserted and fitted into an end portion of the second tubular body, and the fixing portion is secured to the wall surface of the first tubular body by a rivet or a bolt. It is characterized by being fastened to.

  In the third invention of the present application, in the tubular body joint structure according to the first or second invention, the fitting insertion portion of the bracket can be press-fitted to the inner peripheral surface of the second tubular body. The second tubular body is press-fitted into the fitting insertion portion with a smooth surface or a deformed surface having protrusions extending in the axial direction of the bracket formed on the smooth surface.

  According to a fourth invention of the present application, in the tubular body joint structure according to the first, second, or third invention, the outer peripheral shape of the abutting portion of the bracket substantially matches the outer peripheral shape of the second tubular body. It is characterized by that.

  In the present invention, the following effects can be obtained.

  (A) According to the tubular body joining structure according to the first invention of the present application, the end of the second tubular body is fitted to the other end of the bracket whose one end is fastened to the wall surface of the first tubular body. Since the second tubular body is joined to the intermediate portion of the first tubular body in a butted state by being fixed together, for example, the second tubular body is joined to the intermediate portion of the first tubular body. Thermal distortion due to welding heat, as in the case of joining the two pipe bodies by welding, does not occur, and as a result, ex-post strain relief processing is unnecessary, and workability in joining work is improved and joining costs are reduced. In addition to being promoted, it is possible to improve the accuracy and reliability of the shape of the tubular assembly as a product, for example, a handrail.

  In addition, since there is no thermal strain in the tube body, for example, it is easy to insert other tubes into the tube body so that they can be expanded and contracted. For example, in a handrail as a tube body assembly, High functionality can be achieved.

  (B) According to the joint structure for tubular bodies according to the second invention of the present application, the fitting portion of the bracket fastened to the wall surface of the first tubular body by a rivet or a bolt is used as the second tubular body. Since the first tubular body and the second tubular body are joined to each other by being inserted into and fitted to the end portion, there is no thermal effect on these joined portions. The effect described in a) can be ensured.

  The above-mentioned “tightening” is a concept including both the pressure contact fixing by the screw tightening force and the pressure contact fixing by the rivet caulking force.

  (C) According to the joint structure for tubular bodies according to the third invention of the present application, the second tubular body is press-fitted into the fitting insertion portion of the bracket, thereby joining them together. Since the tubular body is joined to the first tubular body, there is no thermal influence on these joints, and as a result, the effect described in (b) above is ensured.

  In addition, when the insertion portion of the bracket is the smooth surface, a substantially uniform surface pressure can be obtained over the entire circumference of the insertion portion. A required fastening force (friction holding force) can be obtained. On the other hand, when the fitting insertion portion of the bracket has the deformed surface, the surface pressure is locally increased at the protruding portion, so that a large fastening force can be obtained.

  (D) According to the joint structure for tubular bodies according to the fourth invention of the present application, in addition to the effects described in the above (a), (b) or (c), the following effects can be obtained. That is, in the present invention, the outer peripheral shape of the abutting portion of the bracket is substantially matched with the outer peripheral shape of the second tubular body, so that the second tubular body and the bracket have a sense of unity in appearance. In the tubular joined body such as a handrail obtained by appropriately joining the first tubular body and the second tubular body, the design is improved.

1 is an overall perspective view of a handrail device to which a tubular body joining structure according to a first embodiment of the present invention is applied. It is a front view containing the partial cross section of the said handrail. It is an enlarged view of the A section of FIG. It is a disassembled perspective view of the junction part shown in FIG. It is principal part sectional drawing of the handrail apparatus with which the joining structure of the tubular body concerning 2nd Embodiment of this invention was applied, Comprising: It corresponds to FIG. 3 in 1st Embodiment. It is a disassembled perspective view of the junction part shown in FIG.

  Hereinafter, the present invention will be specifically described based on preferred embodiments.

  1 and 2 show a handrail device 1 manufactured by applying the joining structure according to the first embodiment of the present invention. This handrail device 1 is installed at a stepped portion such as an ascending ridge of an entrance, and is used when an elderly person walks and moves on the stepped portion, and is placed on the lower side of the stepped portion such as between entrance soils. A handrail unit 2 described below is mounted on a base 3 to be mounted via a pair of support columns 4 and 4.

  The handrail unit 2 includes a handrail bar 20 and a support body 21. Since the handrail bar 20 is intended to assist the walking by grasping a handrail user such as an elderly person, it is bent into a step shape having a required height difference to correspond to the step shape, The two front and rear portions of the one end 20a and the other end 20b are supported by the support column 21 described below.

  The strut body 21 is formed by joining a plurality of circular pipes (corresponding to “tube bodies” in the claims) into an appropriate shape, and one end of the handrail bar 20 by a fixing bolt 28. The other end of the handrail bar 20 by a first column 22 that is erected on the lower surface side of the portion 20a and whose lower end is fixedly supported on the base 3 side via the column support 4 and a fixing bolt 28 A second support column 22 that is erected on the lower surface side of the portion 20b and supported on the upper side of the stepped portion (for example, on the uphill side) via an extendable leg 27 that is telescopically inserted into the lower end side thereof; The first connecting body 25 spanned between the first support post 22 and the second support post 23 in a substantially horizontal state, and is erected downward from the lower surface of the intermediate portion of the first connecting body 25. The lower end portion is fixed to the base 3 side via the support column support 4. A third support column 24 which is provided with a second coupling member 26 which spans substantially horizontal state between the third post 24 and the second strut 23.

  And in this support | pillar body 21, the junction part of the said 2nd support | pillar 23 and the said 1st coupling body 25 shown by the arrow A, the junction part of the said 1st support | pillar 22 and the said 1st coupling body 25 shown by the arrow B, and The joint structure according to the present invention is applied to each of the joint portion of the second support post 23 and the third support post 24 indicated by the arrow C, and the joint portion of the third support post 24 and the third support post 24 indicated by the arrow D. doing. This joining structure will be specifically described taking the joining portion of the second support 23 and the first connecting body 25 indicated by the arrow A as an example.

  As shown in FIGS. 3 and 4, the bracket 31 described below is interposed between the third support column 24 and the first connecting body 25. The bracket 31 is continuously formed at one end of the fitting insertion portion 32 having an outer diameter that can be press-fitted into the inner surface of the end portion of the first connecting body 25, and the outer diameter thereof is the first diameter. A contact portion 34 that is substantially the same as the outer diameter of the coupling body 25 and has one end surface that is formed in a curved shape that can come into close contact with the outer peripheral surface of the second support post 23, and the fitting insertion portion 32 and the contact portion 34. Is provided with a fixing portion 33 formed so as to be partitioned on the inner peripheral side thereof. The fixing portion 33 is provided with two holes 41 and 41 so as to correspond to the two holes 42 and 42 provided on the peripheral wall of the second support post 23.

  When joining the second support post 23 and the first connecting body 25, first, the end face of the contact portion 34 of the bracket 31 is brought into contact with the outer peripheral surface of the second support post 23, and the second support post 23 side is contacted. The holes 42 and 42 correspond to the holes 41 and 41 on the bracket 31 side.

  In this state, the rivet 40 is inserted into the hole 42 and the hole 41 corresponding to the same line from the inner peripheral side of the second support post 23 toward the bracket 31 side, and the end of the bracket 31 side is crimped. The bracket 31 is fastened and fixed to the second support post 23 by the rivets 40 and 40. Next, one end of the first connecting body 25 is press-fitted into the fitting portion 32 of the bracket 31 fixed to the second support column 23 side, and both of them are fixed. Thus, the second support post 23 and the first connecting body 25 are joined via the bracket 31. In addition, each junction part shown by arrow B-E is joined similarly.

  Here, a second embodiment of the joint structure will be described with reference to FIGS. This joining structure is basically the same as that of the first embodiment shown in FIGS. 3 and 4, and is different from this in the first embodiment as shown in FIGS. Whereas the outer peripheral surface of the fitting insertion portion 32 of 31 is a smooth surface, in the second embodiment, as shown in FIG. 5 and FIG. It is a point made into the deformed surface which provided the protrusion 35 extended in the direction with multiple (in this embodiment, 4 pieces).

  As described above, when the fitting insertion portion of the bracket is an irregular surface provided with a plurality of the protrusions 35, the surface pressure is locally increased at the protrusion 35 portion, so that a large fastening force is obtained. The strength reliability of the joint can be increased accordingly.

  In each of the above embodiments, the rivet 40 is used as a means for fixing the bracket 31 to the second support post 23 and the like. However, the present invention is not limited to such a configuration. Instead, a fixing bolt can be used.

  As described above, the following operation and effect can be obtained by adopting the fastening method in which the bracket 31 is interposed as described above as a method of joining a pair of circular pipes joined and fixed to the T shape.

  (1) For example, since thermal strain does not occur in the tube joint as in the case of adopting welded joint, a subsequent strain relief treatment is unnecessary, and workability in joining work is improved and joining cost is reduced. Promoted.

  (2) Since thermal distortion does not occur in the joint, the shape accuracy and reliability of the handrail device 1 as a product are improved, and as a result, the commercial value thereof is increased.

  (3) Since no thermal strain is generated in the joint portion, for example, as shown in the joint portion indicated by arrow C in FIG. 2, the telescopic legs 27 are inserted into the second support column 23 so that they can be stretched. The handrail device 1 can be highly functional.

  The present invention can be widely used in a manufacturing process such as a handrail constituted by a joined body of tubular bodies.

1 ..Handrail device 2 ..Handrail unit 3 ..Base 4 ..Pole support 20 ..Handrail bar 20
21 .. Column body 22 .. First column 23 .. Second column 24 .. Third column 25 .. First connecting member 26 .. Second connecting member 27 .. Extendable leg 28 .. Fixing bolt 31 Bracket 32 .. Insertion part 33 .. Fixing part 34 .. Abutting part 35 .. Projection 40 .. Rivet 41 .. Hole 42 .. Hole

Claims (4)

A tubular structure for joining the first tubular body and the second tubular body in a state where the end of the second tubular body is abutted against the intermediate portion of the first tubular body from the outside in the radial direction. There,
A bracket having one end side fastened to the wall surface of the first tubular body is provided, and an end portion of the second tubular body is fitted and fixed to the other end side of the bracket fastened to the first tubular body side. A tubular joint structure characterized by that. In claim 1,
The bracket includes an abutting portion that abuts on a peripheral surface of the first tubular body, a fixing portion that is fastened to a wall surface of the first tubular body, and an end portion of the second tubular body. A tube joining structure, comprising: a fitting insertion portion to be inserted and fitted, wherein the fixing portion is fastened to a wall surface of the first tube by a rivet or a bolt. In claim 1 or 2,
The fitting insertion portion of the bracket is a smooth surface that can be press-fitted to the inner peripheral surface of the second tubular body, or a deformed surface in which a protrusion extending in the axial direction of the bracket is formed on the smooth surface. The tube joining structure, wherein the second tube is press-fitted into the fitting portion. In claim 1, 2 or 3,
A tubular body joining structure, wherein an outer peripheral shape of the abutting portion of the bracket is substantially matched with an outer peripheral shape of the second tubular body.