JP2010208679A - Resin component coupling structure and structure frame of conveyance tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resin component coupling structure and a structure frame of a conveyance tool in which coupling strength and rigidity of a coupling section of resin components can be increased more than those of a conventional one. <P>SOLUTION: In the resin component coupling structure, a part of a fitting protrusion 49 of a first resin component 21 is cut off and separated in a cantilever state to form an upper engaging protrusion 36 and a lower engaging protrusion 35 and when the fitting protrusion 49 is engaged into an protrusion engaging hole 56 of a second resin component 51, an upper cotter protrusion 36A and a lower cotter protrusion 35A at the tips of the upper engaging protrusion 36 and the lower engaging protrusion 35 are engaged into engaging slits 62, 63 of the protrusion engaging hole 56 and then the first and the second resin parts 21, 51 are coupled. Those upper cotter protrusion 36A and the lower cotter protrusion 35A are arranged in a separate position even if they are observed from either of the engaging direction or the width direction of the fitting protrusion 49. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a resin component coupling structure that couples a plurality of resin components that constitute a luggage conveyance device, and a conveyance device configuration frame having a resin component coupling structure.

  Conventionally, a raising frame that is assembled to a container having an open top box shape is known as this type of transfer device constituting frame. The raised frame is formed by joining a plurality of plate-like resin parts, and at the joint part, a pair of engaging projecting pieces project from the end face of one resin part in an opposing state, and the other resin part A projecting piece insertion hole is formed on the end face. Then, after the pair of engaging protrusions are elastically deformed so as to approach each other and inserted into the protruding piece insertion holes, they are restored and the retaining protrusions at the tips of the engaging protruding pieces are inserted into the protruding piece insertion holes. Engage (see, for example, Patent Document 1).

Japanese Utility Model Publication No. 02-43333 (FIG. 2)

  By the way, in addition to the tensile load in the direction of pulling out the engagement protrusions, the upper / lower / left / right bending load (bending moment), the upper / lower / left / right shear load, and the like are applied to the joint portion between the resin parts. However, in the above-described conventional coupling structure between resin parts, the engagement protrusion that elastically deforms during the coupling process is configured to receive all loads. There could be a situation of detachment.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a resin component coupling structure and a conveying instrument configuration frame that can increase the coupling strength and rigidity of the coupling portion between resin components as compared with the conventional art. .

  In order to achieve the above object, a resin part coupling structure according to the invention of claim 1 is configured such that a fitting protrusion protrudes from a first resin part included in a plurality of component parts of a load carrying device, and the fitting protrusion is provided. A part of the piece is cut into a cantilever shape to form an engaging protrusion, and a retaining protrusion protrudes from the tip of the engaging protrusion to the side of the fitting protrusion, and is included in a plurality of components. By fitting the fitting protrusion into the protrusion fitting hole formed in the second resin part and engaging the retaining protrusion with the engaged portion in the protrusion fitting hole, the first and second A resin component coupling structure that couples resin components, wherein a plurality of engagement protrusions are provided, and the retaining protrusions of the plurality of engagement protrusions are arranged in any of the fitting direction and the width direction of the engagement protrusions. Even if it sees, it has the feature in the place arranged away.

  According to a second aspect of the present invention, there is provided the resin component coupling structure according to the first aspect, wherein a peripheral portion surrounding the base end portion of the fitting protrusion of the first resin component, and a protrusion fitting hole of the second resin component. A pair of opposed planes opposed to each other in the fitting direction of the fitting protrusion are formed on the opening edge, and stepped portions of the overhang structure are formed on the pair of opposed planes so as to be point-symmetric with each other. Thus, it has a feature in which the concave and convex portions are engaged.

  A transport device constituting frame according to the invention of claim 3 is a transport device constituting frame for constituting a side wall in a box-shaped structure or a tray-structured load transport device, and is a plate-like shape constituting a part of the side wall. It is characterized in that the resin parts are joined in a state of abutting each other, and the joining part includes the resin part joining structure according to claim 1 or 2.

[Invention of Claim 1]
In the resin part coupling structure according to claim 1, when the fitting protrusion is fitted into the protrusion fitting hole between the first and second resin parts, the engagement protrusion is formed by separating a part of the fitting protrusion. The retaining protrusion at the tip of the piece is engaged with the engaged portion of the protruding piece fitting hole, and the first and second resin parts are held in a coupled state. Here, the tensile load applied to the joint portion of the first and second resin parts is received by the engaging protrusion, and at least a part of the load (bending load, shearing load) other than the tensile load is the fitting protrusion. Since it is received, the load applied to the engaging protrusion is reduced as compared with the prior art. Thereby, the joint strength of the resin parts by the engagement protrusion becomes higher than before. Moreover, since loads other than the tensile load are received by the fitting protrusions that are not elastically deformed in the joining process, the rigidity of the joining portion between the resin parts is higher than before. Furthermore, since a plurality of engaging protrusions are provided, this also increases the coupling strength. In addition, since the plurality of retaining protrusions are arranged apart from each other in the fitting direction and the width direction of the fitting protrusions, there is no undercut portion on the mold forming, and the mold cost is reduced. It can be suppressed.

[Invention of claim 2]
In the resin component coupling structure according to claim 2, since the step portion of the overhang structure is provided on the opposing planes of the first and second resin components and the concave and convex portions are engaged, The bond strength between the first and second resin parts increases.

[Invention of claim 3]
According to a third aspect of the present invention, there is provided a transport device constituting frame that is formed by joining plate-shaped resin parts together using the resin component joining structure according to the first or second aspect of the present invention, and constituting a side wall of the transport device constituting frame. Therefore, the rigidity of the frame for constituting the transfer device is increased and the shape is stabilized.

The upper surface side perspective view of the thin rectangular tray which concerns on one Embodiment of this invention Disassembled perspective view of thin rectangular tray Bottom perspective view of thin rectangular tray Perspective view of stacked thin rectangular trays The enlarged perspective view of the joint part of the 1st and 2nd resin parts The enlarged perspective view of the joint part of the 1st and 2nd resin parts An enlarged perspective view of a joined state of the first and second resin parts Enlarged side view of the joint part of the first resin part Enlarged plan view of the joint part of the first resin part The perspective view of the molding die of the 1st resin part Perspective view of the first resin part with the molding part color-coded on the molding die

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. A thin rectangular tray 10 shown in FIG. 1 corresponds to a “luggage transport device” according to the present invention, and a resin is formed on the lower surface of a transport device constituting frame body 20 (hereinafter simply referred to as “frame body 20”) according to the present invention. It has a structure in which a bottom structure sheet 11 made of metal is stretched.

  As shown in FIG. 2, the bottom component sheet 11 includes a sheet main body portion 11H having a rectangular shape as a whole, and the first gripping piece 12 projects obliquely outward from one short side of the sheet main body portion 11H. The second gripping piece 13 projects obliquely upward from the side. In addition, L-shaped notches 11A are formed at the four corners of the sheet main body 11H by cutting the outer edge into an L shape.

  As shown in FIG. 1, the frame body 20 has a rectangular shape in which the planar shape corresponds to the outer edge shape of the bottom component sheet 11. The frame 20 is formed by joining a pair of first resin parts 21 and 21 and a pair of second resin parts 51 and 51. As shown in FIG. 2, each first resin component 21 has a portal structure that constitutes a short side portion and both side corners of the frame body 20, and each second resin component 51 is a length of the frame body 20. It has a linear structure that constitutes the entire intermediate portion excluding both ends of the side portion. That is, in the frame body 20 of the present embodiment, there are joint portions between the first resin component 21 and the second resin component 51 at a total of four positions near the both ends of the pair of long side portions. In addition, a “resin component coupling structure” according to the present invention is provided at a coupling portion between each of the first resin component 21 and the second resin component 51.

  The first resin component 21 has a lattice-shaped rib 23 on the outer surface of a strip 22 bent in a gate shape in a horizontal plane, and has a structure in which a bottom reinforcing wall 24 projects inward from the lower edge of the strip 22. Yes. Then, a pair of lateral ribs 23A, 23A included in the lattice-shaped ribs 23 project laterally from the upper and lower edges of the strip 22 to form the upper and lower surfaces of the first resin component 21. Yes. Further, the lateral ribs 23A and 23A are offset in an upward stepped manner at the L-shaped portions along the corners of the first resin component 21 to form corner protrusions 25A and corner recesses 25B.

  As shown in FIG. 5, the pair of vertical ribs 23 </ b> B and 23 </ b> B included in the grid-shaped ribs 23 of the first resin component 21 project laterally from the respective leading edges of the band plate 22, and the leading ends of the first resin component 21. The coupling end face 27 is formed. Further, the vertical ribs 23 </ b> B forming each coupling end surface 27 are bent in a stepped manner at an intermediate position in the vertical direction, whereby a stepped portion 31 is formed on the coupling end surface 27. Furthermore, fitting protrusions 49 are formed to protrude from the upper end position to the lower end position of each coupling end surface 27 of the first resin component 21. The step 31 and the fitting protrusion 49 will be described in detail later.

  As shown in FIG. 2, the second resin component 51 includes lattice-shaped ribs 53 on the outer surface of the band plate 52 that extends straight in the horizontal direction and whose width direction faces the vertical direction, and from the lower edge of the band plate 52. The bottom reinforcing wall 54 is projected on the inside. Further, a pair of lateral ribs 53A, 53A included in the lattice-shaped rib 53 protrudes laterally from the upper edge portion and the lower edge portion of the band plate 52 to form the upper surface and the lower surface of the second resin component 51. .

  Square tube portions 55 and 55 are provided at both ends of the second resin component 51. As shown in FIG. 5, each square tube portion 55 is disposed at the vertical rib 53 </ b> B of the lattice-shaped rib 53 disposed near the tip of the strip plate 52, and at the upper and lower edges of the strip plate 52. A pair of lateral ribs 53A, 53A, the front end portion of the strip plate 52, and the outer side having the same shape as the front end portion of the strip plate 52 and connected to the front ends of the pair of lateral ribs 53A, 53A and the lattice-shaped rib 53 It consists of a face wall 55A, and the inside of each square tube portion 55 is a projecting piece fitting hole 56 according to the present invention. Further, a coupling end surface 57 facing the coupling end surface 27 of the first resin component 21 is formed at the opening edge of each square tube portion 55, and a stepped portion 61 is also formed on the coupling end surface 57. Then, between the first and second resin parts 51, the fitting protrusions 49 are inserted into the protrusion fitting holes 56 and the stepped portions 31 and 61 are engaged with each other in a concavo-convex manner. The resin parts 21 and 51 are coupled.

  Specifically, the coupling end surfaces 27 and 57 of the first and second resin parts 21 and 51 both correspond to “opposing planes” according to the present invention, are planes parallel to the vertical direction, and have a step portion 31. , 61 are arranged at intermediate portions in the vertical direction of the coupling end faces 27, 57. Further, with respect to the first resin component 21, the step surface 30 of the step portion 31 faces upward, and the portion of the coupling end surface 27 that is above the step portion 31 becomes the rear end surface 29 that is separated from the second resin component 51. The lower part of the part 31 is a front end face 28 that is close to the second resin component 51.

  On the other hand, regarding the second resin component 51, contrary to the first resin component 21, the step surface 60 of the step portion 61 faces downward, and the upper portion of the coupling end surface 57 above the step portion 61 is the first resin component. The front side end face 58 approaches the 21 side, and the lower part from the stepped part 61 is the rear side end face 59 separated from the first resin component 21. That is, between the first and second resin parts 21, 51, the step portions 31, 61 have a point-symmetric shape in which the concavities and convexities are reversed.

  The step portions 31 and 61 both have an overhang structure. Specifically, the step surface 30 of the first resin component 21 is inclined so as to cover the end portion of the rear end surface 29 in the horizontal direction, and a recess is formed between the rear end surface 29 and the step surface 30. Crosses the front end face 28 at an acute angle. On the other hand, the step surface 60 of the second resin component 51 has an overhang structure in which the step surface 30 of the first resin component 21 is inverted. Specifically, as shown in FIG. 8, the end portion on the rear end surface 29 side of the step surface 30 is orthogonal to the rear end surface 29, and the entire step surface 30 excluding the end portion on the rear end surface 29 side is Inclined with respect to the horizontal direction.

  Then, after the fitting protrusion 49 is inserted into the protrusion fitting hole 56, the first and second resin parts 21 and 51 are shifted from each other in the direction intersecting the insertion direction, and FIG. As shown in FIG. 7B, the step surfaces 30, 60 (see FIG. 5) are brought into close contact with each other and the step portions 31, 61 are engaged between the first and second resin parts 21, 51. The detachment of the first and second resin parts 21 and 51 is restricted in the insertion direction of the fitting protrusion 49 (see FIG. 5).

  As shown in FIG. 6, the fitting projecting piece 49 includes a projecting piece reinforcing rib 34 on one side surface of the projecting piece main body wall 32 projecting horizontally from the coupling end surface 27. The projecting piece main body wall 32 is arranged in a range from the upper end position to the lower end position on the coupling end surface 27 with the width direction directed vertically. The projecting piece body wall 32 is disposed near one side edge of the coupling end surface 27, and the projecting piece reinforcing rib 34 projects from the projecting piece body wall 32 toward the other side edge of the coupling end surface 27. .

  As shown in FIG. 5, the projecting piece reinforcing rib 34 extends laterally at the upper and lower edges of the projecting piece main body wall 32 and the central portion in the vertical direction, and is vertically moved at the tip edge of the projecting piece main body wall 32. Extending in the direction. The projecting piece main body wall 32 is divided into two upper and lower rectangular regions by the projecting piece reinforcing ribs 34, and an upper engagement projecting piece 36 is formed in the upper rectangular region of the projecting piece main body wall 32. A lower engagement protrusion 35 is formed in the region.

  The upper engaging protruding piece 36 is formed by forming a “laterally U-shaped” slit 33 in the protruding piece main body wall 32, thereby separating a part of the protruding piece main body wall 32 into a cantilever shape. The upper engaging protrusion 36 extends from the protrusion reinforcing rib 34 at the front end edge of the protrusion main body wall 32 toward the coupling end surface 27 of the first resin component 21. Further, a pair of reinforcing protrusions 36L and 36L are formed in a state extending in the horizontal direction on the back side surface of the upper engaging protrusion 36 located in the protrusion reinforcing rib 34. Then, as shown in FIG. 6, an upper retaining protrusion 36 </ b> A is formed to protrude from the front end of the upper engaging protrusion 36 on the front side opposite to the protrusion reinforcing rib 34.

  The upper retaining protrusion 36 </ b> A extends in the entire width direction of the upper engagement protrusion 36 and is trapezoidal when viewed from the width direction of the fitting protrusion 49, as shown in FIG. 9. Further, the coupling end surface 27 side of the upper retaining protrusion 36A is a locking surface 36K parallel to the coupling end surface 27, and the coupling end surface gradually increases as the side opposite to the coupling end surface 27 is laterally separated from the projecting piece body wall 32. The inclined surface 36S is inclined toward the 27 side.

  As shown in FIG. 5, the lower engagement protrusions 35 have the same configuration except for the length with respect to the upper engagement protrusions 36, and are provided with reinforcing protrusions 35 </ b> L and 35 </ b> L on the back side surface. As shown in FIG. 6, a lower retaining projection 35A is provided at the front end of the front side surface. Further, as shown in FIG. 8, the lower retaining projection 35A is also provided with an inclined surface 35S and a locking surface 35K. In the fitting direction of the fitting protrusion 49, the upper retaining protrusion 36A and the lower retaining protrusion 35A are separated from each other. Here, since the upper retaining protrusion 36A and the lower retaining protrusion 35A are separated from each other even in the width direction of the fitting protrusion 49, the upper retaining protrusion 36A and the lower retaining protrusion 35A are fitted to the fitting protrusion 49. They are arranged apart from each other in both the alignment direction and the width direction.

A pair of engagement slits 62 and 63 (corresponding to the “engaged portion” according to the present invention) corresponding to the upper retaining projection 36A and the lower retaining projection 35A are provided on one side of the rectangular tube portion 55. And are formed. When the fitting protrusion 49 is fitted into the protrusion fitting hole 56, the upper retaining protrusion 36A and the lower retaining protrusion 35A are engaged with the engaging slits 62 and 63 as shown in FIG. Match.
The engagement slits 62 and 63 are longer in the vertical direction than the upper retaining protrusion 36A and the lower retaining protrusion 35A. Further, the inside of the projecting piece fitting hole 56 is substantially the same width as the fitting projecting piece 49, and the vertical direction is slightly larger than the fitting projecting piece 49. Accordingly, the first and second resin parts 21 and 51 can be shifted in the vertical direction in a state where the upper retaining protrusion 36A and the lower retaining protrusion 35A are engaged with the engagement slits 62 and 63, respectively.

  This completes the description of the structure of the components of the thin rectangular tray 10 of the present embodiment. Next, the effect of this embodiment is demonstrated with the assembly method of these components.

  In order to complete the frame 20 by assembling the pair of first resin parts 21 and 21 and the pair of second resin parts 51 and 51 shown in FIG. Resin parts 51 and 51 are joined. For this purpose, the fitting protrusion 49 is protruded while the fitting protrusion 49 of the first resin component 21 is slidably brought into contact with the lower surface of the protrusion fitting hole 56 in the rectangular tube portion 55 shown in FIG. Insert into the fitting hole 56. Then, the inclined surfaces 36S and 35S (see FIG. 9) of the upper retaining protrusion 36A and the lower retaining protrusion 35A come into contact with the opening edge of the projecting piece fitting hole 56 midway. When the fitting protrusion 49 is pushed into the back of the protrusion fitting hole 56 from there, the upper engagement protrusion 36 and the lower side are brought into sliding contact with the inclined surfaces 36S, 35S and the opening edge of the protrusion fitting hole 56. The engaging protrusion 35 is bent, and the fitting protrusion 49 is inserted to the back of the protrusion fitting hole 56. Then, the upper retaining projection 36A and the lower retaining projection 35A engage with the engagement slits 62 and 63 (see FIG. 7A) on the back side surface of the projecting piece fitting hole 56, and the upper retaining projection 36A and the lower side The locking surfaces 36K and 35K (see FIG. 9) of the retaining protrusion 35A are locked to the inner surfaces of the engagement slits 62 and 63, and the fitting protrusion 49 is prevented from coming off in the protrusion fitting hole 56.

  At this time, between the first and second resin parts 21, 51, the front end face 28 and the rear end wall 59 shown in FIG. 6 are joined, and the front end face 58 and the rear end wall 29 are joined. The step surfaces 30 and 60 are separated in the vertical direction. Therefore, when the second resin component 51 is shifted downward with respect to the first resin component 21, the step surfaces 30, 60 of the step portions 31, 61 are in close contact with each other between the first and second resin components 21, 51. (See FIG. 7B). Here, since the stepped portions 31 and 61 have an overhang structure, they are engaged in the fitting direction of the fitting protrusions 49, and the separation of the first and second resin parts 21 and 51 is restricted. Further, when the second resin component 51 is shifted downward, the upper retaining projection 36A and the lower retaining projection 35A are displaced downward within the engagement slits 62, 63, and the locking surfaces 36K, 35K and the engagement slit 62, The locked state with the inner surface of 63 is maintained. Further, the entire lower surface of the first resin component 21 and the entire lower surface of the second resin component 51 are flush with each other in a state where the step surfaces 30 and 60 are in close contact with each other. In this way, the first resin component 21 and the second resin component 51 are combined to complete the frame body 20.

  Next, the bottom component sheet 11 is fixed to the lower surface of the frame body 20. As an example, an adhesive is applied to the entire lower surface of the first resin component 21, and as shown in FIG. 3, the L-shaped notch 11A in the bottom constituting sheet 11 is aligned with the corner recess 25B of the frame 20, The main body portion 11H is fixed to the lower surface of the frame body 20 (the bonding method may be welding or double-sided tape). When the adhesive is solidified, the first and second resin parts 21 and 51 do not shift up and down, and the step portions 31 and 61 are held in an engaged state. Further, the first gripping piece 12 and the second gripping piece 13 of the bottom constituting sheet 11 are in a state of projecting to the side of the frame body 20. Thus, the thin rectangular tray 10 is completed.

  As shown in FIG. 4, when a plurality of thin rectangular trays 10 are stacked, a corner protrusion 25 </ b> A (see FIG. 1) of the lower thin rectangular tray 10 becomes a corner recess 25 </ b> B of the upper thin rectangular tray 10. The upper and lower thin rectangular trays 10 and 10 are positioned by engaging the projections and depressions (see FIG. 1). Further, when the thin rectangular tray 10 is transported, for example, the first gripping piece 12 or the second gripping piece 13 of the thin rectangular tray 10 is gripped and lifted, and the tilted posture is maintained and pulled forward. Or carry it after placing it on the lift.

  Here, when the thin rectangular tray 10 is transported, various loads are applied to the connecting portions of the first and second resin parts 21 and 51 constituting the frame body 20. Of these loads, the tensile load is received by the upper engagement protrusion 36 and the lower engagement protrusion 35. At least a part of loads (bending load, shear load) other than the tensile load is received by the protruding piece reinforcing rib 34 and the protruding piece main body wall 32 of the fitting protruding piece 49.

  This reduces the load on the upper and lower engaging protrusions 36 and 35 compared to the conventional coupling structure in which all loads are received by the engaging protrusions. The bonding strength between the first and second resin parts 21 and 51 by 35 is higher than the conventional one. Further, since the plurality of engaging protrusions 35 and 36 receive a pulling force, this also increases the coupling strength. Furthermore, since loads other than the tensile load are received by the fitting protrusions 49 that are not elastically deformed during the coupling process, the rigidity of the coupling portion between the first and second resin parts 21 and 51 is higher than before. In addition, since the plurality of retaining projections (35A, 36A) are arranged apart from each other in the fitting direction and the width direction of the fitting projection piece 49, the undercut portion on the molding is formed. This eliminates mold costs.

  More specifically, when the front side surface of the fitting protrusion 49 from which the upper retaining protrusion 36A and the lower retaining protrusion 35A protrude is formed by a slide mold that slides in the width direction of the fitting protrusion 49, the upper protrusion is temporarily stopped. When the protrusion 36A and the lower retaining protrusion 35A are arranged at the same position in the projecting direction of the fitting protrusion 49 and overlap when viewed from the width direction of the fitting protrusion 49, the upper retaining protrusion 36A and the lower retaining protrusion 35A Between the projections 35A is an undercut portion, and in order to form the undercut portion, an orthogonal slide type that slides in a direction orthogonal to the slide mold is required. On the other hand, according to the configuration of the present embodiment, the upper retaining protrusion 36A and the lower retaining protrusion 35A are shifted in the projecting direction of the fitting projection piece 49 and separated from the width direction of the fitting projection piece 49. Since it is arranged, there is no undercut portion, and the above-described orthogonal slide mold is not necessary, and the mold cost can be reduced.

  FIGS. 10A and 10B show an example of a molding die for molding the fitting protrusion 49. The molding die includes an upper die 81 that slides from above the fitting projection piece 49 along the front side surface of the fitting projection piece 49, and a front side surface of the fitting projection piece 49 from below the fitting projection piece 49. And a lower mold 82 that slides along. In this example, the lower surface of the fitting protrusion 49 is formed by the base portion 82C of the lower mold 82, and the upper retaining protrusion 36A and the lower retaining protrusion 35A are formed by the standing portion 82B that stands upward from the base portion 82C. The downward end surface, the locking surfaces 36K and 35K, and the lower portion of the front side surface of the fitting protrusion 49 are formed. That is, the hatched portion of the front side surface of the fitting protrusion 49 shown in FIG. Then, the hatched remaining portion of the front side surface of the fitting projection piece 49 can be formed by the hanging portion 81 </ b> B hanging from the base portion 81 </ b> A of the upper mold 81. 10A and 10B, a rib molding die 83 for molding the inside of the protruding piece reinforcing rib 34 on the back surface side of the fitting protruding piece 49 is shown as an upper mold 81 and a lower side. Although provided so as to be movable in a direction orthogonal to the sliding direction of the mold 82, in the configuration of the present embodiment, the ribs are formed regardless of the presence or absence of the undercut portion between the upper retaining protrusion 36A and the lower retaining protrusion 35A. The molding die 83 is necessary.

[Other Embodiments]
The present invention is not limited to the above-described embodiment. For example, the embodiments described below are also included in the technical scope of the present invention, and various other than the following can be made without departing from the scope of the invention. It can be changed and implemented.

  (1) In the said embodiment, although the example which applied this invention to the coupling | bonding of the resin component which comprises the frame 20 was shown, the resin component coupling | bonding structure of this invention is not limited to this, For example, When the bottom wall and the lid of the container are coupled with a plurality of resin parts, the present invention may be applied to the coupling portion.

  (2) In the above-described embodiment, the number of engaging protrusions provided at the coupling portion of the first and second resin parts 21 and 51 is two, but the number of engaging protrusions is three or more. There may be.

  (3) In the embodiment, after the fitting protrusion 49 is inserted into the protrusion fitting hole 56, the first and second resin parts 21, 51 are shifted in the direction orthogonal to the insertion direction, and the step portion 31. , 61 are engaged, but the first and second resin parts are not shifted in the direction orthogonal to the insertion direction, and the stepped portions are joined by pressing in the fitting direction of the fitting protrusions. It may be configured.

DESCRIPTION OF SYMBOLS 10 Thin rectangular tray 20 Conveying-apparatus structure frame 21 1st resin part 27,57 Joint end surface (opposing plane)
31, 61 Stepped portion 35 Lower engaging protrusion 35A Lower retaining protrusion 36 Upper engaging protrusion 36A Upper retaining protrusion 49 Fitting protrusion 51 Second resin component 56 Projection piece fitting hole

Claims (3)

A fitting protrusion is protruded from a first resin part included in a plurality of component parts of the load carrying device, a part of the fitting protrusion is separated into a cantilever shape, and an engagement protrusion is formed. A retaining protrusion protrudes from the end of the engaging protrusion to the side of the fitting protrusion,
The fitting protrusion is fitted into a protrusion fitting hole formed in a second resin part included in the plurality of component parts, and the retaining protrusion is engaged with the engaged portion in the protrusion fitting hole. By combining, it is a resin component coupling structure that couples the first and second resin components,
A plurality of the engaging protrusions are provided, and the retaining protrusions of the plurality of engaging protrusions are arranged apart from each other in the fitting direction and the width direction of the fitting protrusions. Characteristic resin component connection structure.   In the fitting direction of the fitting protrusion, the peripheral portion surrounding the proximal end portion of the fitting protrusion in the first resin part and the opening edge of the protrusion fitting hole in the second resin part. A pair of opposed flat surfaces are formed, and stepped portions of an overhang structure are formed on the pair of opposed flat surfaces so as to have a point-symmetric shape with each other, and are engaged with unevenness. Item 3. A resin part bonding structure according to Item 1. A carrier structure frame for constituting a side wall in a box-shaped structure or a tray-structured luggage carrier instrument,
3. A conveying device comprising: a plate-like resin component constituting a part of the side wall coupled to each other, and the coupling portion comprising the resin component coupling structure according to claim 1 or 2; Composition frame.

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