JPH11188780A - Split hollow body made of synthetic resin, blow molding die therefor, and molding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a split hollow body which positively and smoothly absorbs an impact to be inflicted on a crew member at the time of an impact contact and forms an impact absorber with a small number of parts and at a low cost as well as a molding die for the split hollow body. SOLUTION: The split hollow body is formed of plural hollow parts 2 connected to each other integrally, in a freely foldable manner, on part of a connection part 3. An impact absorber of an almost semi-circular cylindrical shape is obtained by folding the hollow part 2 at the connection part 3 and bringing a first surface 2c holding the connection part 3 into close contact, totally face to face, with the first surface 2c of the adjacent hollow part 2. The split hollow body is blow-molded using a blow-molding die which has two or more hollow part molding cavities 11a, 12a for molding each of the hollow plats 2 and connection part molding cavities 11b, 12b for molding the connection part 3 connecting the adjacent hollow part molding cavities 11a, 12a to each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a divided hollow body whose interior is divided, for example, to absorb an impact, and a mold for molding the hollow body. The present invention relates to a method for forming a decorative divided hollow body in which the sheet material is attached to the surface of the hollow body in a state where the end is wound on the back side.

[0002]

2. Description of the Related Art
For example, an instrument panel of an automobile, a door, a seat back, a ceiling member, or the like in a general living space is provided with impact mitigation means for alleviating an impact when a human body or an article collides with such a portion. .

For example, Japanese Patent Application Laid-Open No. 7-246951 discloses a front pillar of an automobile having a shock absorbing structure. In the front pillar, an energy absorbing panel is arranged along the inner panel at a fixed distance from the inner panel inside a structural member formed by an inner panel and an outer panel. The energy absorbing panel has a smaller thickness than the inner panel and the outer panel, and can be deformed by a predetermined load or more. Further, the pillar garnish arranged on the vehicle compartment side of the inner panel has a buffer boss having a reinforcing rib integrally projecting from the back surface thereof, and the boss penetrates the inner panel to extend the energy absorbing panel. Is in contact with

When an occupant collides with the pillar garnish in an accident or the like, the pillar garnish is displaced toward the outside of the vehicle body due to the impact. The buffer boss presses the energy absorbing panel by this displacement to deform the panel, thereby absorbing the recoil from the pillar garnish to the occupant.

In this shock absorbing structure, when an occupant makes contact with the inner panel near the projecting portion of the buffer boss and in the same direction as the projecting direction of the boss, the boss absorbs the energy. The panel can be largely displaced, and the impact energy can be sufficiently absorbed. However, when the occupant collides with the buffer boss at a position away from the projecting portion and in a direction inclined with respect to the projecting direction, the contact energy acts on the boss from an oblique direction. As a result, the displacement of the energy absorbing panel by the boss is small, and sufficient impact absorption is not performed.

Further, in the above-mentioned shock absorbing structure, a hole for inserting the buffer boss into the inner panel must be formed so that the buffer boss penetrates the inner panel and abuts on the energy absorbing panel. In addition, it is necessary to dispose the energy absorbing panel between the inner panel and the outer panel, and the assembling work becomes complicated. Further, since a buffer boss for pressing the panel must be integrally formed on the back surface of the pillar garnish, extrusion molding or blow molding, which is a molding method with high production efficiency, cannot be adopted. Not only does the mold of the garnish become complex,
Sinks due to the buffer bosses occur on the surface of the formed pillar garnish, which impairs the appearance. Also,
The above-described shock absorbing structure has a large number of component parts, which increases the cost.

[0007] For example, Japanese Patent Application Laid-Open No. 8-175303 discloses an impact energy absorber installed on a steering wheel, an instrument panel, or the like of an automobile. The absorber is disposed between a core bar of the boss portion of the steering wheel and a pad disposed above the core bar. The impact energy absorber includes a base portion and an assembly fixed to the base portion and including three energy absorbing members. The assembly consists of two cylinders
A ceiling part having a divided shape, and a plurality of energy absorbing members radially connected from the central axis of the cylinder, the ceiling part and the energy absorbing member are integrally formed from sheet metal or hard synthetic resin. You. When an impact force is applied to the impact energy absorber from its structure, the ceiling of the assembly breaks and the impact energy absorbing member deforms to absorb the impact force.

However, the assembly has a complicated internal structure in which a plurality of energy absorbing members are integrally connected on the central shaft side and each of the energy absorbing members is integrally connected to the ceiling on the outside. For this reason, the assembly cannot be formed by blow molding which can be formed with both ends closed. That is, since the assembly is formed in a state where both end portions are open, when a large impact is received, its impact resistance is small and it is instantaneously deformed, so that the impact cannot be sufficiently absorbed. . In addition, when mounted in a vehicle cabin, the assembly must be covered with a pad as described above so as not to impair the appearance, and the pad cannot be excluded.

By the way, in general, a member installed in a vehicle interior is covered with a decorative sheet material up to a peripheral edge on the back surface side of the member and is adhered thereto, so that a resin between the members when installed in the vehicle interior can be removed. The appearance is improved without exposing the material.

For example, Japanese Patent Application Laid-Open No. 62-255118 discloses a decorative hollow in which a decorative sheet material is attached to the surface of the blow-molded hollow body while covering the surface of the hollow body to the back side peripheral edge at the same time. A method for blow molding a body is disclosed.
The method will be described with reference to FIG. 13. First, the decorative sheet material S is formed along the cavity 51a of the first mold 51 having the molding cavity 51a on the surface side of the hollow body 60.
And the parison P is supplied to close the first mold 41 and the second mold 52 having the molding cavity 52a on the back surface side of the hollow body 60. Further, the first and second molds 5
An insertion core 53 having a molding cavity 53a on the back side peripheral edge of the hollow body 60 is inserted into the joint between the first and second members 52, and the decorative sheet material S is blow molded in a state of being folded inward. Thus, the decorative hollow body 60 in which the back side peripheral edge is covered with the decorative sheet material S is obtained.

However, in this molding method, the edge of the decorative sheet material S folded inward by the insertion core 53 is pushed back by the parison P which expands at the time of blow molding, and is molded in a wrinkled state. In some cases, the peripheral edge of the back surface of the hollow body 60 cannot be beautifully covered with the decorative sheet material S. Moreover, since the molding die requires the core 53, the structure of the die and its driving are complicated.

The present invention has been made in order to solve such a problem, and the present invention can be manufactured efficiently, so that the occupant can hit any part and at any angle.
A divided hollow body that constitutes an inexpensive shock absorber that can reliably and sufficiently absorb the impact, has a small number of parts, is easy to assemble, and has a simple mold for forming the hollow body. The purpose is to provide a type.

Further, according to the present invention, at the same time as the blow molding of the hollow body, the decorative sheet material is coated on the surface of the hollow body up to the back surface side edge of the hollow body and can be beautifully attached without wrinkles. It is another object of the present invention to provide a method for forming a divided hollow body.

[0014]

In order to solve the above problems, the present invention has a plurality of hollow portions formed by integral molding, and each hollow portion is partially connected to an adjacent hollow portion. It has a connecting portion integrally connected so as to be bendable, and at least a part of the first surfaces of the adjacent hollow portions among the first and second surfaces sandwiching the connecting portion of each hollow portion is in contact with each other. The first main structure is a divided hollow body made of a synthetic resin, which is a contactable contact surface.

The present invention also provides a mold for blow-molding such a divided hollow body, wherein two or more hollow-section molding cavities for molding each of the hollow sections and the adjacent hollow-section molding cavities are provided. And a connecting portion forming cavity for forming the connecting portion for connecting between the two. A blow molding die having a second main configuration.

The divided hollow body is partitioned into a plurality of hollow portions by a wall portion of the first surface portion in contact with the first hollow portion by bending at the connecting portion so that at least a part of the first surfaces is in contact with each other. At the same time, the entire second surface constitutes an outer shell. When the inside of the assembly is radially partitioned by the wall, the assembly functions effectively as a shock absorbing member.

That is, when an impact force is applied to the second surface of the impact buffering member, the impact is absorbed by the wall portion being deformed or broken and the hollow portion being deformed.
Further, according to the present invention, the shock absorbing member is formed by blow molding and is formed as a hollow body having a wall surface at an end thereof. Is hardly deformed and has an appropriate strength, so that it can have a sufficient shock absorbing function even for a large shock.

Further, since the inside of the shock absorbing member is radially partitioned by the wall as described above, even if an impact force is applied to any portion of the second surface of the shock absorbing member, the impact is not affected. Is reliably and sufficiently absorbed.

Further, the present invention is characterized in that a decorative sheet material is disposed along the molding cavity surface of the second surface and blow-molded by using the above-mentioned blow-molding mold. The method has a third main configuration. Preferably, the decorative sheet material is continuously provided up to a part of a molding cavity on a third surface which is a connection end surface between the first surface and the second surface.

When the divided hollow body to which the decorative sheet material is attached is assembled as described above, the decorative sheet material is attached to a part of the third surface located on the back side of the assembly when assembled. Since the resin material is attached, the appearance is improved without the resin material being exposed even from the gap between the members when installed in the vehicle interior.

Further, according to the above-mentioned method, it is sufficient that the sheet material is arranged in close contact with the cavity surface in the same mold, and it is necessary to insert an insertion core between the blow molding dies as in the conventional case. Since there is no molding, the mold structure is simplified, and molding can be easily performed without increasing the number of molding steps. Further, since the sheet material does not wrinkle when the insertion core is inserted, the sheet material is beautifully attached.

When the decorative sheet material covers the second surface of the divided hollow body as described above, it is possible to form the connecting portion only with the decorative sheet material.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings. FIG.
FIG. 2 is a sectional view of a divided hollow body according to the first embodiment of the present invention, and FIG. 2 is a sectional view of a shock absorber obtained from the divided hollow body.

The divided hollow body 1 has three hollow portions 2 each having a fan-shaped cross section, each of which has an arc-shaped portion 2a and a V-shaped portion 2b. Each hollow portion 2 is adjacent to the hollow portion 2 and the arc-shaped portion 2a. And a connecting portion 3 which is integrally connected to the end edge of the connecting portion so as to be bendable. The inside angle of the V-shaped portion 2b of the hollow portion 2 is 60 °, one surface of the V-shaped portion 2b sandwiching the connecting portion 3 constitutes a first surface 2c of the present invention, and the surface of the arc-shaped portion 2a is Construct a second surface. Further, the surface of the V-shaped portion 2b, which is a connection end surface between the first surface and the second surface, constitutes a third surface of the present invention. The divided hollow body is a blow molded body of a thermoplastic resin such as polypropylene, polyethylene, ABS, mPPO, PC, and TPE.

The divided hollow body 1 is bent at the connecting portion 3 so that the top portions 2e of the V-shaped portion 2b are overlapped with each other.
When the entire surfaces of the first surfaces 2c adjacent to each other are brought into close contact with each other, the shock absorber 4 shown in FIG. 2 is obtained.

The shock absorber 4 has an arc-shaped portion 4a and a flat portion 4
b, the arc-shaped portion 4a is composed of the second surface 2a of the hollow body 1, and the flat portion 4b is composed of the third surface 2d of the hollow body 1. Furthermore, the inside of the absorber 4 is adjacent to the first hollow body 1 of the divided hollow body 1.
The whole surface of the surface 2c is brought into close contact with the two adjacent V-shaped portions 2b.
, And is divided into three equal parts by a wall portion 4c extending radially around the axis of the cylinder.

The shock absorber 4 is installed with the arc-shaped portion 4a facing the occupant as the flat surface 4b and the mounting surface. The absorber 4 is a single assembly having the above configuration. , Its installation is easy. When an occupant collides with the arc-shaped portion 4a of the shock absorber 4, the wall 4c of the absorber 4 is bent or broken, and the hollow portion 2 is deformed. Further, since the divided hollow body 1 constituting the absorber 4 is formed by blow molding and is formed as a hollow body having a wall surface at an end thereof, it is difficult to be instantaneously deformed by impact and has appropriate strength. Therefore, it has a sufficient shock absorbing function even for a large impact, and the impact force acting on the occupant is reliably and sufficiently reduced.

In this embodiment, the wall portion 4c is formed by adhering the entire surfaces of two adjacent first surfaces 2c of the V-shaped portion 2b and overlapping the adjacent V-shaped portions 2b as described above. Therefore, the thickness is doubled and the rigidity is appropriate. Therefore, when a predetermined impact force is applied, the impact is deformed or broken, and the impact can be more effectively absorbed.

Further, since the wall portion 4c of the shock absorber 4 extends radially about the axis of the cylinder as described above, even if the occupant collides with any part of the arc-shaped portion 4a, The direction of the contact is similar to the direction in which the wall portion 4c extends, and the impact can be reliably absorbed.

If the number of the wall portions 4c is increased, that is, if the number of hollow portions constituting the divided hollow body is increased, the extending direction of the wall portion 4c substantially coincides with any contact direction. And the shock absorbing performance is improved. Therefore, it is preferable to further increase the number of the wall portions in a shock absorber installed at a portion where an occupant is expected to come into contact with the vehicle from multiple directions.

Hereinafter, a molding die and a molding method for the divided hollow body 1 will be described with reference to FIGS. FIG.
FIG. 4 is a cross-sectional view of a forming die immediately before forming the divided hollow body 1, and FIG. 4 is a cross-sectional view of the forming die at the time of forming the divided hollow body 1.

The molding die 10 includes first and second dies 1
The first mold 11 has three arc-shaped molding cavities 11a for molding the arc-shaped portions 2a in the hollow portion 2 of the divided hollow body 1 described above, and the second mold has Reference numeral 12 has three V-shaped part forming cavities 12a for forming the V-shaped part 2b of the hollow part 2. Further, the two dies 11 and 12 have connecting portion forming cavities 11b and 12b for forming the connecting portion 3 of the divided hollow body 1 adjacent to between the forming cavities 11a and 12a of each hollow portion 2. doing.

A parison P is supplied between the first and second molds 11 and 12, and the first and second molds 11 and 12 are closed while blowing a predetermined amount of air into the parison P to expand the parison. And blow molding. By closing both the dies 11 and 12, the connection portion forming cavities 11 b and 12 are closed.
The upper and lower sides of the parison P come into close contact with each other within b, and the divided molded body 1 in which the hollow portions 2 are connected by the connecting portions 3 is formed as shown in FIG.

In the above-described method, the molds 11 and 12 are closed in a state where the parison P is inflated by calculating the amount of air blown in advance at the time of molding to form the divided molded body 1. After the molds 11 and 12 are closed and the parison P is brought into close contact with the upper and lower portions of the parison P in the connection portion molding cavities 11b and 12b, air is blown into each hollow portion 2 to expand the parison P, and the division is performed. The molded body 1 can be formed.

As described above, the divided hollow body 1 has the first
In addition, it is possible to easily perform blow molding by the molding die 10 having a simple structure composed of only the second dies 11 and 12, thereby improving the production efficiency and lowering the production cost. It becomes possible.

FIG. 5 is a sectional view of the shock absorber 5 according to the second embodiment of the present invention, and FIG. 6 is a shock absorber 6 according to the third embodiment.
FIG. The shock absorber 5 according to the second embodiment, like the shock absorber 4 according to the first embodiment, has a semi-cylindrical shape having an outer contour formed of an arc-shaped portion 5a and a flat portion 5b, and has an interior centered on the axis of the cylinder. And is equally divided into three by a wall portion 5c extending radially. Further, in the shock absorber 5 according to the second embodiment, a groove 5d having a semicircular cross section is formed in the center of the flat portion 5b, that is, in the cylindrical axis direction.

The groove 5d is provided on the installation surface M of the shock absorber 5.
A positioning rib R having the same cross-sectional shape as that of the shock absorber 5 is provided in a protruding manner, and the shock absorber 5 is installed in a state where the rib R is fitted in the groove 5 d of the shock absorber 5. Thereby, the positioning accuracy at the time of installing the shock absorber 5 is remarkably improved. Further, the wall 5c of the shock absorber 5
And the surface of the rib R are orthogonal to each other, so that the load acting on the wall portion 5c when an impact is applied to the absorber 5 can be reliably applied to the rib R, that is, the installation surface of the absorber 5 Thus, the displacement of the absorber 5 can be prevented.

In order to obtain the above-described shock absorber 5,
The shape of the V-shaped portion forming cavity 12a in the second mold 12 may be changed so that the top 2e of the V-shaped portion 2b in the hollow portion 2 of the divided hollow body 1 has an arc shape.

The shock absorber 6 according to the third embodiment shown in FIG.
Similarly to the above-described shock absorber 4, the outer shell has a semi-cylindrical shape including an arc-shaped portion 6a and a flat portion 6b, and the inside is equally divided into three by a wall portion 6c extending radially around the axis of the cylinder. However, it differs from the shock absorber 4 in that the wall 6c is bent at two points. That is, the portion corresponding to the V-shaped portion 2b of the first embodiment in the divided hollow body constituting the absorber 6 is bent. Also in this case, the first surface sandwiching the connecting portion of the hollow body is in close contact with the entire surface.

Since the shock absorber 6 has a bent wall portion 6c, when a shock is applied to the shock absorber 6, the wall portion 6c is bent.
c is bent at the bending point to absorb the impact. In this manner, by forming the wall portion 6c to be bent, the wall portion 6c can be easily deformed by a smaller shock than the shock absorber 4 described above. In this way, by changing the shape of the wall 6c, the impact force at which the shock absorber 6 is deformed can be appropriately set, and the shock absorber 6 has an optimal shock absorption according to the installation site. Performance can be achieved.

In obtaining the shock absorber 6, the first surface 2c of the divided hollow body 1 according to the first embodiment is also required.
The shape of the V-shaped portion forming cavity 12a in the second mold 12 may be changed so as to be bent.

In addition to the above embodiments, the cross section of the hollow portion of the hollow body may be triangular or even polygonal, and the plurality of hollow portions may have different shapes. The shape can be appropriately changed according to the installation position of the assembly obtained from the hollow body.

Further, a method of attaching the decorative sheet material S to the surface of the divided hollow body simultaneously with the blow molding of the hollow body will be described with reference to FIGS. Decorated divided hollow body 3
0 is an arc-shaped portion 31a and a V-shaped portion 31b as shown in FIG.
And has two hollow portions 31 having a fan-shaped cross section
One surface of the V-shaped portion 31b sandwiching the connecting portion 32 of the V-shaped portion 31b constitutes a first surface 31c of the present invention, and a surface of the arc-shaped portion 31a constitutes a second surface of the present invention. . Further, the end surface of the V-shaped portion 31b connecting the first surface 31c and the second surface 31a is the third surface 31 of the present invention.
Construct d. A part of the second surface 31a and a part of the third surface 31d are covered with the decorative sheet material S. Further, the hollow portions 31 each have a connecting portion 32 integrally connected to an end edge of the arc-shaped portion 31a so as to be bendable. In this embodiment, the connecting portion 32 is provided with the decoration. It is composed of a sheet material S.

The divided hollow body is made of polypropylene, polyethylene, ABS, mPP in the same manner as in the above embodiment.
It is a blow molded article of a thermoplastic resin such as O, PC, TPE, or the like. In addition, as the decorative sheet material S, a woven or knitted fabric, a nonwoven fabric,
Alternatively, a TPO sheet or a PVC sheet provided with a backing made of polypropylene, polyethylene, ABS, PC, TPE, plain woven fabric, knitted fabric, or the like can be used.

Molding mold 20 for the decorative divided hollow body 30
Is composed of first and second molds 21 and 22. The first mold 21 has a portion covered with the decorative sheet material S in the hollow portion 31 of the divided hollow body 30, that is,
It has two hollow molding cavities 21a for molding the surface of the arcuate portion 31a and part of the third surface 31d, and a connecting portion for molding the connecting portion 32 between the two hollow molding cavities 21a. It has a molding cavity 21b. On the other hand, the second mold 22 includes the V-shaped portion 3.
In this embodiment, there are two hollow molding cavities 22a for molding the remainder of 1b, that is, the first surface 31c, and a coupling molding cavity 22b between the two hollow molding cavities 22a. Then, these three cavities are connected to form a single rectangular cavity.

In order to form the decorative divided hollow body 30, first, as shown in FIG. 7, a decorative sheet material S is placed in close contact with the forming cavities 21a and 21b of the first mold 21. The parison P is supplied between the first and second molds 21 and 22. Thereafter, the first and second molds 21 and 22 are closed and blow-molded as shown in FIG. 8 while blowing a predetermined amount of air into the parison P to expand it. By closing the molds 21 and 22, the parison P is divided into two in the connection portion forming cavities 21 b and 22 b, and the hollow portion 31 is formed of the decorative sheet material S as shown in FIG. The decorative divided molded body 30 connected by the connecting portion 32 is formed.

Of course, also in the above-described method, the molds 21 and 22 are closed and the parison P is divided into two by the connecting portion forming cavities 21b and 22b, and then air is blown into each hollow portion 31. It is also possible to expand the parison P to form the decorative divided molded body 30.

The connecting portion 32 of the decorative divided hollow body 30
When the entire surfaces of the first surfaces 31c adjacent to each other are brought into close contact with each other, the shock absorber 33 shown in FIG. 10 is obtained.
The shock absorber 33 has a semi-cylindrical shape composed of an arc-shaped part 33a composed of the second surface 31a and a flat part 33b composed of the third surface 31d. The surface of the adjacent V-shaped portion 31b, that is, the entire surface of the first surface 31c is formed in close contact with each other, and is divided into two equal parts by a wall portion 33c extending at right angles to the flat portion 33b. Further, a decorative sheet material S is attached from the arc-shaped portion 33a of the shock absorber 33 to the edge of the flat portion 33b.

The shock absorber 33 can provide the same effect as that of the first embodiment described above against the collision of the occupant. Furthermore, since the front and back side edges are covered with the decorative sheet material, the absorber 33 can be installed in a state of being directly exposed inside the vehicle body. Therefore, there is no need to attach further pads or interior members to the inside of the vehicle body of the shock absorber as in the related art.

The decorative divided hollow body 30 constituting the shock absorbing body 33 is formed by the above-described molding die 20 at the same time as the blow molding and the decorative sheet material.
3 can be attached in a state of covering not only the front surface but also the edge on the back surface side. As described above, this molding die 20 is composed of only the first die 21 and the second die 22 and does not require an insertion core unlike the conventional one, so that the die structure is simple and the driving thereof is also easy. It is. In addition, since the parison P is expanded in a state where the decorative sheet material is brought into close contact with the molding cavities 21a and 21b of the first mold 21 up to the edge thereof, wrinkles and pulling are caused on the surface of the divided hollow body 30. It is attached beautifully without it.

In each of the above-described embodiments, since the first surfaces are in close contact with each other over the entire surface, the thickness of the wall formed by the first surface is doubled, and the strength of the wall is increased. However, depending on the installation site of the shock absorber, in order to reduce the strength of the wall portion, the shape of the first surface may be at least partially made to be a shape that can abut each other. It is possible.

Further, a shock absorber is formed from the divided hollow body in the above-described embodiment, but the present invention is not limited to this. FIG. 11 shows a decorative divided hollow body 40 according to a fifth embodiment of the present invention. Split hollow body 40
Has a first hollow portion 41 having a substantially rectangular cross section in which two upper corners are formed in an arc shape, and a rectangular cross section having a width dimension substantially half the width of the bottom surface 41 a of the first hollow portion 41. And two second hollow portions 42. The second hollow portion 42 is the first hollow portion 42.
The lower end edge of the hollow portion 41 is integrally connected by a connecting portion 43 in a bendable manner. Further, the first and second hollow portions 4
A decorative sheet material S is adhered to the surfaces of 1, 42.

The divided hollow body 40 having such a configuration is also used in the above-described fourth mold by using the first and second molds having the same cavity as the shape of the hollow body 40 shown in FIG.
Blow molding is performed in the same manner as in the embodiment, and a decorative sheet material is attached simultaneously with the molding.

As shown in FIG. 12, the decorative divided hollow body 40 is connected to the connecting portion 4 so that the bottom surface 42a of the second hollow portion 42 is brought into close contact with the bottom surface 41a of the first hollow portion 41.
3, the entire surface is decorated sheet material S
Can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view of a divided hollow body according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of a shock absorber obtained from the divided hollow body.

FIG. 3 is a sectional view of a molding die immediately before molding of the divided hollow body.

FIG. 4 is a sectional view of a molding die during molding of the divided hollow body.

FIG. 5 is a cross-sectional view of a shock absorber according to a second embodiment of the present invention.

FIG. 6 is a sectional view of a shock absorber according to a third embodiment of the present invention.

FIG. 7 is a cross-sectional view showing a state in which a decorative sheet material and a parison are supplied to a molding die for a decorative divided hollow body.

FIG. 8 is a cross-sectional view of a mold at the time of blow molding a decorative divided hollow body.

FIG. 9 is a cross-sectional view showing a state in which a molding die is opened after molding the decorative divided hollow body.

FIG. 10 is a sectional view of a decorative shock absorber according to a fourth embodiment of the present invention.

FIG. 11 is a sectional view of a decorative divided hollow body according to a fifth embodiment of the present invention.

FIG. 12 is a sectional view of a hollow assembly obtained from the decorative divided hollow body.

FIG. 13 is an explanatory view of a molding process of a conventional decorative hollow body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Split hollow body 2 Hollow part 2a Arc-shaped part (2nd surface) 2b V-shaped part 2c 1st surface 2d 3rd surface 2e Top 3 Connecting part 4 Shock absorber 4a Arc-shaped part 4b Flat part 4c Wall 5 Shock absorber 5a Arc-shaped part 5b Flat part 5c Wall part 5d Groove part 6 Shock absorber 6a Arc-shaped part 6b Flat part 6c Wall part 10 Molding die 11 First die 11a Arc-shaped part forming cavity 11b Connection part forming cavity 12 Second die 12a V-shaped Part forming cavity 12b connecting part forming cavity 20 forming die 21 first die 21a hollow part forming cavity 21b connecting part forming cavity 22 second die 22a hollow part forming cavity 22b connecting part forming cavity 30 decorative divided hollow body 31 hollow Part 31a Arc-shaped part (second surface) 31b V-shaped part 31c First surface 31d Third surface 32 Connecting part 33 Impact Absorber 33a Arc-shaped portion 33b Flat portion 33c Wall 40 Decorated divided hollow body 41 First hollow portion 41a Bottom surface 42 Second hollow portion 42a Bottom surface 43 Connecting portion 44 Hollow assembly 51 First mold 51a Mold cavity 52 Second metal Mold 52a Mold cavity 53 Insert core 53a Mold cavity 60 Decorating hollow body P Parison S Decorating sheet material SM Installation surface R Positioning rib

Claims (4)

[Claims] 1. A plurality of hollow portions formed by integral molding, and each hollow portion has a connecting portion integrally connected to an adjacent hollow portion so as to be partially bendable. At least a part of the first surfaces of the adjacent hollow portions among the first and second surfaces sandwiching the connecting portion is a contact surface capable of contacting with each other. Split hollow body. 2. A mold for blow molding the divided hollow body according to claim 1, wherein two or more hollow molding cavities for molding each of the hollows and the adjacent hollow molding are formed. And a connecting part forming cavity for forming the connecting part connecting between the cavities. 3. A divided hollow body, comprising: using the blow molding die according to claim 2, disposing a decorative sheet material along a molding cavity surface of the second surface and performing blow molding. Molding method. 4. The molding method according to claim 3, wherein the decorative sheet material is further connected to a part of a molding cavity on a third surface, which is a connection end surface between the first surface and the second surface. .