JP6989753B2 - Structure - Google Patents

Description

The present invention relates to a structure.

Patent Document 1 discloses a board locking mechanism in a bed that automatically locks when the board is mounted.

Japanese Patent No. 2868119

When the board locking mechanism disclosed in Patent Document 1 is manufactured by integrally molding a sheet metal on a resin bed board main body, the following problems arise.

Sheet metal does not weld to resin, and the shrinkage rate after molding is smaller than that of resin. Therefore, when the sheet metal and the resin are integrally molded, the resin may shrink around the sheet metal and the resin molded body may bend. As a result, the locking strength to the bed is reduced and the appearance is also deteriorated.

The present invention has been made in view of such circumstances, and provides a structure capable of reducing the bending of a resin molded body even when a member having a shrinkage ratio different from that of the resin is integrally molded with the resin.

According to the present invention, the structure includes a resin main body portion and an insert member insert-molded into the main body portion, and at least a part of a side surface of the insert member and the main body portion. A structure is provided that is configured to be non-contact.

The structure of the present invention includes a main body made of resin and an insert member insert-molded in the main body. Then, it is configured so that at least a part of the side surface of the insert member and the main body portion are not in contact with each other. This makes it possible to reduce the bending of the resin after molding.

Hereinafter, various embodiments of the present invention will be illustrated. The embodiments shown below can be combined with each other.
Preferably, the insert member includes a pair of opposed long side portions and short side portions so that the entire long side portion is not in contact with the main body portion.
Preferably, a recess is provided in the base surface of the main body, and an insert surface in which the insert member is insert-molded is provided in the recess.
Preferably, the distance between the side surface of the insert member and the portion of the side wall of the recess facing the side surface is ½ or more of the thickness of the insert member.
Preferably, the recess comprises a first recess and a second recess provided in the first recess, and the insert surface is provided in the second recess.
Preferably, the distance between the side surface of the insert member and the side wall of the second recess is ½ or more of the thickness of the insert member.
Preferably, the depth of the second recess is 0.5 to 1.5 times the thickness of the insert member.
Preferably, the insert member comprises a plate-shaped base and a bent piece formed by bending a portion of the base portion punched toward the inside of the main body portion, and a resin around the bent piece. The insert molding is performed so as to cover the plastic.
Preferably, the main body is a hollow body, and the insert member is a sheet metal.

FIG. 1A is a front perspective view of the structure 100 according to the embodiment of the present invention. FIG. 1B is a rear perspective view of the structure 100. FIG. 2A is a front perspective view of the insert member 10 constituting the structure 100. FIG. 2B is a rear perspective view of the insert. FIG. 3A is a right side view of the insert member 10 as seen from the direction of arrow R in FIG. FIG. 3B is a cross-sectional view corresponding to FIG. 2A, which is a cross-sectional view passing through points p1 and p2 in FIG. It is a bottom view of the insert member 10 seen from the direction of arrow Z3 in FIG. It is a perspective view of the sheet metal 10p of the pre-stage molded into the insert member 10. FIG. 6A is a front perspective view of the insert member 10 formed by bending the sheet metal 10p. FIG. 6B is a rear perspective view of the insert member 10. It is an end view of the plane PA in FIG. 1 in the direction of arrow Z1. It is a partially enlarged view of the region RX in FIG. 7. It is an end view of the plane PB in FIG. 1 in the direction of arrow Z2. It is an end view in the arrow Y direction in the plane PC in FIG. It is an end view through the bent piece 2 seen from the direction of arrow Z3 in FIG. It is a perspective view of the mold apparatus 9s used when the insert member 10 is insert-molded into the main body 101. It is a perspective view of the mold apparatus 9s, and is the view seen from the side opposite to FIG. It is an end view which passes through the center of a pin 94, and is the end view which shows the state which the pin 94 is inserted into the insertion hole 63, and the insert member 10 is attached to the mold 9a. It is a perspective view which shows the positional relationship when the insert member 10 is attached to the mold 9a, and the parison P is hung between the mold 9a and the mold 9b. It is an end view which passes through the center of a mold apparatus 9s and a pin 94. It is an end view corresponding to FIG. 16, and is the end view when the mold apparatus 9s is tightened. It is an end view in the arrow Z1 direction in the plane PA in FIG. 1 at the time of mold clamping. FIG. 19A is a front perspective view of Modification 1 corresponding to FIG. 2A. FIG. 19B is a rear perspective view of Modification 1 corresponding to FIG. 2B. FIG. 20A is a front perspective view of Modification 2 corresponding to FIG. 2A. FIG. 20B is a rear perspective view of Modification 2 corresponding to FIG. 2B. 21A is a front perspective view of Modification 3 corresponding to FIG. 2A. 21B is a rear perspective view of Modification 3 corresponding to FIG. 2B. FIG. 22A is a conceptual diagram showing the structure of the comparative example. FIG. 22B is a conceptual diagram showing how the resin RS bends due to resin shrinkage.

Hereinafter, embodiments of the present invention will be described. The various features shown in the embodiments shown below can be combined with each other. In addition, the invention is independently established for each characteristic item.

1. Structure 100
As shown in FIG. 1, the structure 100 according to the embodiment of the present invention includes a resin main body portion 101 and an insert member 10 insert-molded into the main body portion 101. The main body 101 is provided with a base surface 103, and the center thereof is a recess 102 that is dented inside. Further, the recess 102 includes a first recess 102a and a second recess 102b provided in the first recess 102a (described later with reference to FIGS. 7 and 8). Then, a surface second base surface 103a having a height substantially the same as the bottom surface 102aP of the first recess 102a is formed in a part of the main body portion 101. This makes it easier to attach the insert member 10 to other members.

Examples of the material of the main body 101 include polyolefins (for example, polypropylene, high-density polyethylene), polyamides, and polystyrenes which are homopolymers or copolymers of olefins such as ethylene, propylene, butene, isoprenepentene, and methylpentene. Acrylic derivatives such as polyvinyl chloride, polyacrylonitrile, ethylene-ethyl acrylate copolymer, polycarbonate, vinyl acetate copolymer such as ethylene-vinyl acetate copolymer, ionomer, tarpolymer such as ethylene-propylene-diene, ABS. Examples thereof include thermoplastic resins such as resins, polyolefin oxides, and polyacetals. In particular, in the structure 100, polypropylene is preferable from the viewpoint of cost and moldability. In the present embodiment, the insert member 10 is insert-molded into the recess 102 provided in the main body 101.

2. Insert member 10
Next, the insert member 10 will be described with reference to FIGS. 2 to 6. As shown in FIGS. 2 to 4, the insert member 10 is formed by processing a sheet metal 10p, which will be described later, and has a plate-shaped base 1 and a portion obtained by punching a part of the base 1 as a main body 101. It is provided with a folded piece 2 formed by being bent toward the inside of the. The base portion 1 includes a front surface 11f, a back surface 11b, a pair of opposed long side portions 4, and a short side portion 5. Then, the two arms 14 are formed by the notches 12 provided on the opposite side surfaces of the base 1. Further, the base portion 1 is formed with a bolt insertion hole 3 for inserting a bolt used when attaching the structure 100 to another member.

Further, by bending a portion obtained by punching a part of the base portion 1, a bent piece 2 is formed via the curved portion 21. Here, after the bent piece 2 is formed, the portion punched out from a part of the base portion 1 becomes the punched hole 25.

Then, at the tip of the bent piece 2, a convex portion 24 is formed so as to project in a direction perpendicular to the axial direction of the bent piece 2. Further, the convex portion 24 of the bent piece 2 constitutes the end portion 23. Here, the angle θ formed by the bent piece 2 and the base 1 is preferably 75 ° to 105 °. In this embodiment, the angle θ is 90 °.

Then, as shown in FIG. 2B, the nut 6 is welded to the back surface 11b of the base 1 (the direction in which the bent piece 2 is bent). In the present embodiment, the nut 6 includes a hexagonal portion 62 and a flange 61, and an insertion hole 63 for inserting a bolt is formed in the center thereof. Further, in the present embodiment, as shown in FIG. 2A, a bolt insertion hole 3 for inserting a bolt is formed at a position where the nut 6 of the base 1 is welded. Thereby, when the structure 100 is attached to another member, the bolt can be inserted into the insertion hole 63 of the nut 6 from the front surface 11f side of the base 1 via the bolt insertion hole 3.

3. Sheet metal 10p
Next, the sheet metal 10p in the pre-stage to be molded into the insert member 10 will be described. As shown in FIG. 5, the insert member 10 shown in FIG. 6 is formed by bending each portion of the sheet metal 10p shown by the broken line toward the back surface 11b along the curved portion forming portion 21p.

4. Internal Structure of Structure 100 Next, the internal structure of the structure 100 will be described with reference to the end views of FIGS. 7 to 11.

FIG. 7 is an end view of the plane PA in FIG. 1 in the direction of arrow Z1. FIG. 8 is a partially enlarged view of the region RX in FIG. 7. Here, as shown in FIGS. 7 and 8, the main body 101 in the present embodiment is a hollow body made of resin.

As shown in FIG. 8, the structure 100 includes a resin main body portion 101 and an insert member 10 insert-molded into the main body portion 101. Further, at least a part of the side surface of the insert member 10 and the main body 101 are configured to be non-contact. In the present embodiment, the entire long side portion 4 is configured to be non-contact with the main body portion 101.

Further, the recess 102 provided on the base surface 103 of the main body 101 includes a first recess 102a and a second recess 102b provided in the first recess 102a. That is, the depth with respect to the base surface 103 is larger in the second recess 102b than in the first recess 102a. Then, the insert surface 104 in which the insert member 10 is insert-molded is provided in the recess 102 provided in the base surface 103 of the main body portion 101. Specifically, the insert surface 104 is provided in the second recess 102b.

In the present embodiment, the side surface of the insert member 10 (the side surface of the long side portion 4) and the portion of the side wall 102s of the recess 102 facing the side surface of the insert member 10 (the side surface of the long side portion 4) (that is, the second recess). The distance D from the side wall 102bs) of the 102b is ½ or more of the thickness d of the insert member 10. Specifically, the d / D value is, for example, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, and the numerical values exemplified here. It may be within the range between any two of the above.

Here, in consideration of cleanability, the distance D may be such that a cleaning tool such as a cotton swab can be inserted (3 to 7 mm). It is preferable that a human finger can be inserted (10 mm or more).

Further, the depth dr of the second recess 102b is 0.5 to 1.5 times the thickness d of the insert member 10. In this embodiment, the depth dr and the thickness d are substantially the same.

FIG. 9 is an end view of the plane PB in FIG. 1 in the direction of arrow Z2. Unlike FIG. 7, since it is an end view that passes through the second base surface 103a, the bottom surface 102aP of the first recess 102a, which is higher by the depth dr of the second recess 102b from the insert surface 104, has substantially the same height as the upper surface of the base 1. It has become.

Here, as shown in FIGS. 10 and 11, the resin RS covers the periphery of the bent piece 2 inside the structure 100. In the present embodiment, the amount of the resin RS to be coated on the bent piece 2 is increased by providing the convex portion 24. Further, in the present embodiment, the resin RS forming the end portion 23 of the bent piece 2 and the surface of the main body portion 101 facing the insert surface 104 is welded. As a result, the main body 101 and the insert member 10 are firmly fixed.

Further, as shown in FIGS. 1, 2 and 10, the punched holes 25 are filled with the resin RS. As a result, the appearance of the insert member 10 can be improved, and the mixing of foreign substances such as dust can be reduced. Further, since the front surface 11f of the substrate 1 and the filled resin RS are substantially flush with each other, the stability when positioning the insert member 10 with other members is improved. In the present embodiment, since the resin RS is filled vertically and horizontally symmetrically at the four locations of the substrate 1, the stability is further improved as compared with the case where the resin RS is not filled at the symmetrical positions.

5. Mold device 9s
Next, the mold apparatus 9s used when the insert member 10 is insert-molded into the main body 101 will be described with reference to FIGS. 12 to 18. The mold device 9s is composed of molds 9a and 9b for molding a resin (parison P in a molten state). The molds 9a and 9b are configured to be movable by a cylinder mechanism or the like. Here, in the present embodiment, since the parison P is molded, the main body portion 101 is a hollow body.

As shown in FIGS. 12 and 13, the mold 9a has a substantially rectangular parallelepiped shape and includes a front surface 91f, a back surface 91b, and a peripheral surface 91s which is a surface between them. The front surface 91f is a surface facing the mold 9b, and the back surface 91b is a surface opposite the front surface 91f.

The mold 9a has a cavity 92, and a pinch-off portion 93 is provided so as to surround the cavity 92. In the present embodiment, the parison P can be shaped into a shape along the inner surface of the cavity 92 by the air blown by blow molding.

On the inner surface of the mold 9a, a pin 94 for inserting into the bolt insertion hole 3 of the base 1 and closing the insertion hole 63 of the nut 6 is provided. Further, a part of the inner surface of the mold 9a is a two-base surface forming portion 103a for forming the second base surface 103a.

On the other hand, the outer diameter of the mold 9b is the same as that of the mold 9a, but the inner surface is flat.

As shown in FIG. 14, the insert member 10 is mounted on the mold 9a by moving the insert member 10 in the direction of arrow Z3 and inserting the pin 94 into the insertion hole 63. Here, in the present embodiment, a mounting surface 95 on which the insert member 10 is mounted is provided around the pin 94. Then, a vertically convex portion 96 is provided on the side portion of the mounting surface 95 so that at least a part of the side surface of the insert member 10 and the main body portion 101 are not in contact with each other. In the present embodiment, the vertically convex portion 96 is formed along the long side portion 4 of the insert member 10.

Then, as shown in FIG. 15, the parison P is hung between the mold 9a and the mold 9b with the insert member 10 mounted on the inner surface of the mold 9a.

As shown in FIG. 16, in a state where the parison P is hung between the molds 9a and 9b, the flange 61 of the nut 6 and a part of the parison P are brought into contact with each other. Further, the pinch-off portion 93 of the mold 9b and a part of the parison P are brought into contact with each other.

In this state, air is blown into the parison P to shape the parison P into a shape along the inner surfaces of the molds 9a and 9b. Here, the shaping method is not limited to this, and the parison P can also be shaped using a decompression device.

After that, as shown in FIG. 17, the molds 9a and 9b are clamped. As a result, a hollow body having a shape along the inner surface of the molds 9a and 9b can be obtained. Then, the structure 100 is obtained by taking out the molded body from the mold device 9s and removing the burrs.

Here, FIG. 18 is a diagram corresponding to FIG. 7. By preventing the resin RS from approaching by the vertically convex portion 96 of the mold 9a, at least a part of the side surface of the insert member 10 and the main body portion 101 are not in contact with each other in the structure 100 taken out from the mold device 9s. ..

Here, in the present embodiment, the entire long side portion 4 is configured to be non-contact with the main body portion 101, but the entire short side portion 5 may be configured to be non-contact with the main body portion 101. good. As shown in FIG. 10, when the bent piece 2 provided in the direction of the long side portion 4 can withstand the shrinkage of the resin RS in the direction of the long side portion 4, the short side portion 5 is used. It is not necessary to make the whole body and the main body 101 non-contact. At this time, it is preferable that the bent piece 2 is provided in the vicinity of the end portion of the base portion 1 in the long side portion 4 direction. As a result, the durability against shrinkage of the resin RS in the four directions of the long side portion is further improved. Further, by bending the bent piece 2 starting from a place far from the center of the base 1, the bent piece 2 can be further brought closer to the vicinity of the end portion of the base 1 in the long side portion 4 direction.

From the above, in the structure 100 according to the present embodiment, since at least a part of the side surface of the insert member 10 and the main body portion 101 are not in contact with each other, the main body portion 101 and the insert member 10 are integrally insert-molded. However, the non-contact portion alleviates the shrinkage of the resin after molding.

6. Modifications Next, various modifications will be described with reference to FIGS. 19 to 21.

6-1: Modification 1
As shown in FIG. 19, four nuts 6 may be welded instead of the four bent pieces 2. In this case, the resin RS forming the tip of the nut 6 and the surface of the main body 101 facing the insert surface 104 is welded. As a result, the main body 101 and the insert member 10 are firmly fixed.

6-2: Modification 2
As shown in FIG. 20, the shape of the bent piece 2 may be an H shape. In this case, a notch 26 is provided on the opposite side surface of the bent piece 2. In the example of FIG. 20, a notch 26 is formed substantially at a right angle to the end portion 23 of the bent piece 2. Here, the shape and depth of the notch 26 are not particularly limited, and any configuration can be used. Specifically, the shape of the notch 26 may be a rectangle, a polygon, an arc, or the like. Further, the depth of the notch 26 can be 5,10,15,20,25,30,35,40,45% or a ratio between these with respect to the width of the bent piece 2. In this modification, since the notch 26 is provided so that the convex portion 24 is formed, the notch 26 is filled with the resin RS. As a result, the main body 101 and the insert member 10 are firmly fixed.

6-3: Modification 3
As shown in FIG. 21, the bent piece 2 may be bent in the direction along the long side portion 4. In this case, the convex portion 24 is formed in the direction of the long side portion 4.

7. Comparative Example Next, a comparative example will be described with reference to FIG. 22. FIG. 22A is a conceptual diagram showing a state immediately after molding of a structure having a structure in which the side surface of the insert member 10 and the main body portion 101 are in contact with each other. After a predetermined time has elapsed from this state, the state shown in FIG. 22B is reached. This is because the shrinkage rate of the resin RS is higher than that of the insert member 10, and the bending DEF is generated, so that a gap SP is generated between the resin RS and the insert member 10.

On the other hand, in the structure 100 according to the present embodiment, the non-contact portion serves as a buffer, and the bending DEF of the resin RS can be reduced.

<Others>
The present invention can also be implemented in the following aspects.
-The entire end portion of the base portion 1 is bent to form the bent piece 2 without providing the notch 12.
-Use two resin sheets instead of Parison P.
-The resin sheet may be a foamed resin sheet.

10: Insert member 10p: Sheet metal 1: Base 11f: Front surface 11b: Back surface 12: Notch 14: Arm 2: Bent piece 21: Curved portion 21p: Curved portion forming portion 23: End portion 24: Convex portion 25: Punch hole 26: Notch 3: Bolt insertion hole 4: Long side 5: Short side 6: Nut 61: Flange 62: Hexagon 63: Insert hole 9s: Mold device 9a: Mold 9b: Mold 91f: Front 91b: Back 91s : Peripheral surface 92: Cavity 93: Pinch-off portion 94: Pin 95: Mounting surface 96: Vertical convex portion 97: Second base surface forming portion P: Parison SP: Gap 100: Structure 101: Main body portion 102: Recessed portion 102s: Side wall 102a of the recess: First recess 102aP: Bottom surface 102b of the first recess: Second recess 102bs: Side wall 103 of the second recess 103: Base surface 103a: Second base surface 104: Insert surface RS: Resin

Claims (7)

It ’s a structure,
The structure is a bedboard and
The structure includes a resin main body portion and an insert member insert-molded into the main body portion.
The insert member has a plate-like base and a plurality of covered portions.
The base has a pair of opposing long sides and a pair of opposing short sides.
The main body is provided with a recess.
The recess is provided with an insert surface and a side wall.
The insert member is provided in the recess and is provided.
The base is disposed on the insert surface of the recess.
The long side portion of the base portion has a side surface and first and second surfaces.
The entire side surface of the long side is configured to be non-contact with the side wall of the recess .
The first surface of the long side portion is arranged on the insert surface.
The second surface of the long side portion is formed on the opposite side of the first surface, and the second surface of the long side portion is not covered with the main body portion.
Each of the coated portions is coated with a resin constituting the main body portion.
The covered portion is provided on one end side portion of the base portion in the longitudinal direction of the base portion and on the other end side portion of the base portion of the base portion in the longitudinal direction.
Each of the covered portions is connected to the base and is connected to the base.
Each of the covered portions is a structure provided so as to project from the base portion in a direction from the base portion toward the insert surface . The distance between the side surface of the long side portion of the insert member and the portion of the side wall of the concave portion facing the side surface of the long side portion is ½ or more of the thickness of the insert member. The structure according to claim 1 . The recess includes a first recess and a second recess provided in the first recess.
The structure according to claim 2 , wherein the insert surface is provided in the second recess. The structure according to claim 3 , wherein the distance between the side surface of the long side portion of the insert member and the side wall in the second recess is ½ or more of the thickness of the insert member. The structure according to claim 3 or 4 , wherein the depth of the second recess is 0.5 to 1.5 times the thickness of the insert member. The covered portion is a bent piece formed by bending a portion of the base portion punched out toward the inside of the main body portion .
The covered portion is plate-shaped and has a plate shape.
The structure according to any one of claims 1 to 5 , wherein the portion connecting the covered portion and the base portion extends in the lateral direction of the base portion . The main body is a hollow body.
The structure according to any one of claims 1 to 6 , wherein the insert member is a sheet metal.

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