JP2008155470A - Cushion pad for headrest, molding method and molding mold thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a molding mold of a headrest easily performing manufacture by dispensing with removing operation of burrs formed on a cushion pad. <P>SOLUTION: A first mold 11 and a second mold 12 are connected by a hinge part 13, a third mold 14 is connected to an upper end part of the first mold 11 by a hinge part 15, and a fourth mold 16 is connected to an upper end part of the second mold 12 by a hinge part 17. Grooves are respectively formed at holding positions for a stay member 36 on parting surfaces of the third mold 14 and the fourth mold 16, collar members 22 are respectively fixed to the both grooves, an insertion hole for inserting the stay member 36 to a bottom plate of the both collar member 22, and seal members 26 are respectively stored between an inner bottom part of the both collar members 22 and the stay member 36. The bottom plate of the both collar members 22 and the lower end part of the seal member 26 are projected into a cavity 18 formed by the first to fourth mold. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a cushion pad for a headrest to be mounted on a seat of an automobile, a molding method thereof, and a molding die.

  An automobile bedrest includes a cushion pad made of polyurethane foam, a stay member inserted into the cushion pad and having two legs for supporting the seat and adjusting the height, and the cushion pad. It is comprised by the bag-shaped skin coat | covered on the surface. As a mold for forming the cushion pad, there is a type in which a stay member is inserted into a cavity so that its leg portion is exposed to the outside, and a foamed polyurethane stock solution is injected into the cavity to be foam-cured. After the molded cushion pad is taken out of the mold, a bag-like skin is mounted on the surface thereof.

  As the above-mentioned headrest mold, the one disclosed in Patent Document 1 has been proposed. As shown in FIG. 11, in this mold, a second mold 32 is attached to a first mold 31 through a hinge portion 33 so that it can be opened and closed, and a cavity 34 is formed by both molds. A stay member 36 is attached to the upper part of the second mold 32 via a stay attachment member 35, and a part of the stay member 36 is inserted into the cavity 34. Grooves 31 a and 32 a for loosely inserting the stay member 36 are formed on the joining surfaces of the first and second molds 31 and 32 as shown in FIGS. 12 and 13. Between the inner peripheral surfaces of the grooves 31a and 32a and the outer peripheral surface of the stay member 36, a stay seal portion for sealing between the grooves 31a and 32a and the stay member 36 is formed. . The stay seal portion includes a pair of bottomed semi-cylindrical members 37 attached to the grooves 31a and 32a, and a pair of semi-cylindrical packing members 38 housed inside the collar members 37, respectively. It is comprised by.

Although not shown, an injection port for injecting a foamed polyurethane stock solution into the cavity 34 is provided on the joining surface of the first and second molds 31 and 32. The stock solution injected from the inlet into the cavity 34 is foam-cured in the cavity 34 to form a headrest cushion pad.
JP-A-6-170861

  However, the conventional headrest mold is provided with a collar member 37 so that the cushion pad 41 is not damaged by the collar member 37 when the first mold 31 and the second mold 32 shown in FIG. The member 37 cannot be protruded into the cavity 34. Therefore, the bottom plate 37a of the collar member 37 must be substantially flush with the upper end molding surface of the cavity 34 as shown in FIG. That is, the bottom plate 37a is formed with a semicircular recess 37b for forming an insertion hole for the stay member 36. The recess 37b and the outer peripheral surface of the stay member 36 are connected to the first die 31. Since it is difficult to make the second mold 32 firmly adhere to the mating surface, it becomes a simple contact state, and the polyurethane foam enters the gap g1, and the burr 42a is formed on the surface of the cushion pad 41 as shown in FIG. It is formed. In addition, since both collar members 37 are thin cylindrical bodies, the contact surfaces of both bottom plates 37a are difficult to be firmly attached from the viewpoint of preventing deformation, and the gap g2 between the contact surfaces 37c of both bottom plates 37a is difficult. The polyurethane foam invades and burr 42b is formed on the surface of the cushion pad 41 as shown in FIG. If these burrs 42a and 42b are present, the skin 43 in the vicinity of the stay member 36 floats in a state where the cushion pad 41 is covered with the skin 43 (only the cross section is shown), and the appearance of the headrest is impaired. For this reason, the operation | work which removes the burr | flash 42a, 42b formed in the said cushion pad 41 was needed, and there existed a problem that manufacture of a headrest was troublesome.

  The present invention eliminates the problems in the prior art, eliminates the need to remove burrs formed on the cushion pad, and can be easily manufactured as a cushion pad for a headrest, a molding method thereof, and the like It is to provide a mold.

  In order to solve the above problems, the invention according to claim 1 is a cushion pad for a headrest formed by embedding an upper portion of a stay member having a pair of legs, and the surface of the cushion pad is Recesses are formed so as to surround the legs.

  According to the second aspect of the present invention, the first and second molds connected to be openable and closable at the first end portion, and a plurality of the first and second mold second end portions that are openable and closable. A mold composed of a split mold is used. After the pair of leg portions of the stay member are mounted between the split molds via the stay seal portions, the stock solution of the foam resin is injected into the cavity of the mold, and the stock solution is foam-cured and the cushion pad is molded. The plurality of split molds are opened together with the stay seal portion to release the cushion pad from the mold.

  The invention according to claim 3 connects the first mold and the second mold so that they can be opened and closed at their first ends, and connects the third mold to the second end of the first mold so that they can be opened and closed. The fourth mold is connected to the second end of the two molds so as to be opened and closed. Grooves are formed at the holding positions of the stay members on the mating surfaces of the third and fourth molds, the collar members are fixed to the grooves, and the stay members are inserted through the bottom plates of the collar members. A semicircular recess for forming the hole is formed. Inside each of the collar members, a seal member capable of elastic contact with the outer peripheral surface of the stay member is accommodated in contact with the bottom plate of the collar member. It protrudes into the cavity formed by the fourth mold.

According to a fourth aspect of the present invention, in the third aspect, a chamfered portion having a smaller diameter toward the tip is formed on an outer peripheral surface of a portion of the inner end portion of each of the collar members protruding into the cavity.
According to a fifth aspect of the present invention, in the third or fourth aspect, a positioning member for positioning the sealing member so as not to be separated from the bottom plate of the collar member is attached to the inner peripheral surface of the both color members.

(Function)
Since a recess is formed on the surface of the cushion pad for the headrest of the present invention so as to surround the periphery of the leg portion of the stay member, the burr generated in the molding process can be accommodated in this recess. For this reason, it is possible to prevent burrs from floating on the surface of the cushion pad, and it is unnecessary to remove the burrs prior to the operation of covering the surface of the cushion pad with the epidermis.

  In the molding die of the present invention, the third die and the fourth die fitted with the stay seal portion are opened and closed with respect to the first die and the second die, respectively. The cushion pad is not damaged by the inner end portion of the collar member when the third mold and the fourth mold are released in a state of protruding into the cavity. Also, burrs formed by entering the gap between the recess of the bottom plate of the collar member and the stay member and the gap between the contact surfaces of the two bottom plates are formed inside the recess formed by the inner end portions of both the collar members. The burrs need not be removed.

  According to the present invention, it is possible to easily perform the manufacturing without the need to remove the burrs formed on the cushion pad.

Hereinafter, an embodiment of a headrest mold embodying the present invention will be described with reference to FIGS.
As shown in FIG. 1, the lower first end of the second mold 12 is connected to the first lower end of the first mold 11 of the mold so that the hinge 13 can open and close in the lateral direction. Has been. A third die 14 as a split die is connected to the upper second end of the first die 11 by a hinge portion 15 so as to be opened and closed in the vertical direction. The 4th type | mold 16 is connected with the 2nd end part of the upper side of the said 2nd type | mold 12 by the hinge part 17 so that opening and closing of an up-down direction is possible. A cavity 18 is formed by the first to fourth molds 11, 12, 14, and 16 to mold a cushion pad of a headrest.

  A pair of left and right (only one shown) stay mounting members 19 are mounted on the upper surface of the fourth mold 16, and two stay members 36 (only one shown) are held by both stay mounting members 19. The part 36a is supported so as to pass through the two semi-cylindrical grooves 14b and 16b formed in the joining surfaces 14a and 16a of the third mold 14 and the fourth mold 16.

  The space between the grooves 14 b and 16 b of the third mold 14 and the fourth mold 16 and the outer peripheral surface of the leg portion 36 a of the stay member 36 is sealed by the stay seal portion 21. Hereinafter, the stay seal portion 21 will be described.

  As shown in FIG. 2, the pair of collar members 22 respectively attached to the grooves 14b and 16b of the third die 14 and the fourth die 16 are half cylinders having bolt insertion holes 22b and 22c as shown in FIG. It is comprised by the part 22a and the baseplate 22d integrally formed in the lower end part of this semi-cylindrical part 22a. A semicircular recess 22e for forming an insertion hole through which the leg portion 36a is inserted is formed in both the bottom plates 22d, and a chamfered portion 22f having a smaller diameter at the lower end is formed at the lower end of the semicylindrical portion 22a. . Both the collar members 22 are attached to the grooves 14b and 16b as shown in FIGS. 2 and 3 by bolts 23 penetrating the bolt insertion holes 22b. The end surfaces in the circumferential direction of the collar members 22 are located on the same plane as the bonding surfaces 14a and the bonding surfaces 16a of the third mold 14 and the fourth mold 16, as shown in FIGS. Like to do.

  As shown in FIG. 2, a positioning member 24 having a semi-cylindrical shape is accommodated in the collar member 22, and the positioning member 24 is formed by a bolt 25 penetrating the hole 24 a and the hole 22 c of the collar member 22. The collar member 22 is attached. A rubber seal member 26 is accommodated in each of the collar members 22. As shown in FIG. 5, stay seal grooves 26b for accommodating the leg portions 36a of the stay members 36 are formed on the seal surfaces 26a of the seal members 26, and the positioning members 24 are accommodated on the outer peripheral surfaces. A groove 26c is formed. As shown in FIG. 2, both the positioning members 24 enter the grooves 26 c of the seal member 26 accommodated in the collar member 22 so that the seal member 26 is not moved in the axial direction of the collar member 22. .

  As shown in FIG. 2, the chamfered portion 22 f at the inner end on the bottom plate side of the collar member 22 protrudes into the cavity 18. The projecting dimension of the collar members 22 into the cavity 18 is set to, for example, 2 to 4 times the thickness of the bottom plate 22d. As shown in FIGS. 2 and 6, a gap g1 (see FIGS. 2 and 3) between the recesses 22e and the legs 36a of both collar members 22 and a gap g2 (see FIG. 3) between the joining surfaces of both bottom plates 22d. It sinks inside the cavity 18. In FIG. 6, a dot pattern is provided to make it easy to understand the regions of the gaps g <b> 1 and g <b> 2 that sink into the cavity 18.

  The joint surfaces 14a and 16a of the third mold 14 and the fourth mold 16 are provided with an injection port (not shown) for injecting a foamed polyurethane stock solution into the cavity 18, and the stock solution is foam-cured in the cavity 18. Then, a cushion pad of the headrest is formed.

  After the molding of the cushion pad of the headrest is completed by the molding die shown in FIG. 1, the third die 14 is opened upward with the hinge portion 15 as the center, as shown in FIG. Next, as shown in FIG. 8, the second mold 12 is opened around the hinge portion 13. Further, as shown in FIG. 9, the fourth mold 16 is opened from the second mold 12 around the hinge portion 17. In this state, the holding of the stay member 36 by the stay attaching member 19 is released, the cushion pad 41 is lifted in the direction of the arrow, and the cushion pad 41 is removed from the fourth mold 16.

The surface of the cushion pad 41 manufactured in this way is covered with a bag-like skin (not shown) to form a headrest.
According to the above embodiment, the following effects can be obtained.

  (1) In the above embodiment, the third mold 14 and the fourth mold 16 are supported above the first mold 11 and the second mold 12 so as to be openable upward. Stay seal portions 21 are provided on the joining surfaces 14a and 16a. Further, as shown in FIG. 2, the inner ends (the chamfered portions 22 f) of both the collar members 22 are protruded into the cavity 18. With this configuration, in the state where the chamfered portion 22f of both the collar members 22 has entered the recess 41a of the molded cushion pad 41, the cushion pad 41 is damaged by the mold release operation shown in FIGS. And can be easily taken out.

  (2) In the above embodiment, the seal members 26 are accommodated in the inner bottom portions of the collar members 22, respectively, and the seal members 26 are in close contact with the outer peripheral surface of the leg portion 36a of the stay member 36, and the seal members 26 are mutually Close contact with. Therefore, the height of the polyurethane foam burr 42a that has entered the gap g1 between the outer peripheral surface of the leg portion 36a of the stay member 36 and the inner peripheral surface of the recess 22e and the gap g2 between the contact surfaces of the bottom plate 22d. The height of the foamed polyurethane burr 42b is suppressed to the height of the gaps g1 and g2. The protruding length of the chamfered portion 22f of the collar member 22 into the cavity 18 is set to 2 to 4 times the thickness of the bottom plate 22d. For this reason, the burrs 42a and 42b are sufficiently accommodated in the recess 41a. Therefore, even if the surface of the cushion pad 41 is covered with the skin, the skin is not lifted up by the burrs 42a and 42b, and the secondary processing operation for removing the burrs 42a and 42b is not required, and the headrest can be easily manufactured. Cost can be reduced.

  (3) In the above embodiment, since the chamfered portion 22f having a smaller diameter at the lower end is formed at the protruding portion of the collar member 22 into the cavity 18, the third die 14 is released from the first die 11 and the fourth die 16. In doing so, the chamfered portion 22f is smoothly separated from the recess 41a of the cushion pad 41, and the cushion pad 41 is not damaged. In FIG. 9, when releasing the cushion pad 41 from the fourth mold 16, the cushion pad 41 can be removed smoothly.

  (4) In the above embodiment, since the seal member 26 is accommodated in the collar member 22 and held by the positioning member 24, the seal member 26 can be prevented from being displaced and the sealing performance can be ensured. .

In addition, you may change the said embodiment as follows.
-You may make the shape of the said color member 22 into a semi-square cylinder shape, for example.
-The bolt 23 may be omitted. In this case, the number of parts can be reduced, and the assembly work of the collar member 22 to the third and fourth molds 14 and 16 can be easily performed.

The sealing member 26 may have a shape that is interposed only between the bottom plate 22d and the positioning member 24.
The positioning member 24 may be omitted, and the seal member 26 may be bonded to the collar member 22 with an adhesive.

  The chamfered portion 22f of the collar member 22 may be omitted. In this case, it is preferable to adopt a configuration in which the third mold 14 and the fourth mold 16 are moved linearly and released, and in this way, the cushion is provided when the third and fourth molds 14 and 16 are released. It is possible to appropriately prevent the pad 41 from being damaged by the collar member 22.

The chamfered portion 22f may be formed in an arc shape.
In the above embodiment, the two third molds 14 and the fourth mold 16 are used as the split mold, but three or more split molds may be used instead.

The longitudinal cross-sectional view which shows one Embodiment which actualized the shaping | molding die of the headrest of this invention. The longitudinal cross-sectional view which expanded the stay seal part of the shaping | molding die. FIG. 1 is a sectional view taken along line 1-1 of FIG. 2-2 sectional drawing of FIG. The disassembled perspective view of the component of a stay seal part. The perspective view which shows the attachment state of a color member. Sectional drawing explaining the mold opening operation | movement of a shaping | molding die. Sectional drawing explaining the mold opening operation | movement of a shaping | molding die. Sectional drawing explaining the mold opening operation | movement of a shaping | molding die. The fragmentary perspective view of the cushion pad shape | molded with the shaping | molding die of the headrest of this embodiment. The longitudinal cross-sectional view of the shaping | molding die of the conventional headrest. The expanded cross-sectional view of a stay seal part. The perspective view which shows the attachment state of a color member. The fragmentary perspective view of the cushion pad shape | molded with the shaping | molding die of the conventional headrest.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... 1st type | mold, 12 ... 2nd type | mold, 14 ... 3rd type | mold, 14a, 16a ... Joining surface, 14b, 16b, 26c ... Groove, 16 ... 4th type | mold, 18 ... Cavity, 21 ... Stay seal part, 22 ... collar member, 22d ... bottom plate, 22e ... recess, 22f ... chamfered portion, 24 ... positioning member, 26 ... seal member, 36 ... stay member, 36a ... leg portion, 41 ... cushion pad, 41a ... recess.

Claims (5)

In a cushion pad for a headrest formed by embedding the upper part of a stay member having a pair of legs,
A cushion pad for a headrest, wherein a recess is formed on each surface of the cushion pad so as to surround the two legs. Using a molding die composed of first and second molds that are openably and closably connected to each other at the first end and a plurality of split molds that can be opened and closed at the second ends of the first and second molds. The pair of leg portions of the stay member are mounted between the split molds via the stay seal portions, respectively, and a foamed resin stock solution is injected into the cavity of the molding die, and the stock solution is foam-cured to form a cushion pad. And forming the cushion pad for the headrest by releasing the plurality of divided molds together with the stay seal portion to release the cushion pad from the mold. The first mold and the second mold are connected to each other at their first ends, the third mold is connected to the second end of the first mold so as to be opened and closed, and the second mold is connected to the second end of the second mold. 4 types are connected so that opening and closing is possible, a slot is formed in a holding position of a stay member in the joining surface of the 3rd type and the 4th type, respectively, and a collar member is fixed to each of the both channels, respectively. A semicircular recess for forming an insertion hole through which the stay member is inserted is formed, and a seal member capable of elastic contact with the outer peripheral surface of the stay member is formed inside the collar members. A cushion pad for a headrest, characterized in that each of the collar members is housed in contact with the bottom plate of the base plate, and the inner ends of the collar members protrude into the cavities formed by the first to fourth molds. Type. 4. The cushion pad for a headrest according to claim 3, wherein a chamfered portion having a smaller diameter toward the tip is formed on an outer peripheral surface of a portion of the inner end portion of each of the collar members protruding into the cavity. Mold. 5. The headrest according to claim 3, wherein a positioning member for positioning the seal member so as not to be separated from a bottom plate of the collar member is attached to the inner peripheral surfaces of the collar members. Mold for cushion pad.

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