JP4376705B2 - Headrest and manufacturing method thereof - Google Patents

Description

This invention relates to a manufacturing method of the headrest and its attached to a seat of an automobile.

  In general, in this type of headrest, a stay is inserted inside the bag-shaped epidermis, and the left and right legs protrude downward from the insertion hole in the epidermis, and the foamed elastic material is injected into the epidermis. Thus, the foamed elastic material is molded integrally with the skin by foaming and expanding. However, in a vehicle equipped with a headrest having such a configuration, when a rear collision (so-called rear-end collision) occurs, the rear head of the occupant may sink greatly into the headrest, and the occupant head may not be stably supported.

In order to deal with such a problem, for example, a headrest having a configuration as disclosed in Patent Document 1 has been proposed. That is, in this conventional configuration, a hard core material is attached to the upper end portion of the stay. A foamed elastic material is filled in the outer skin so as to embed the upper end portion of the core material and the stay.
JP-A-9-85755

  In Patent Document 1, after fixing the core material to the upper end portion of the stay, prior to molding the foamed elastic material, the core material and the upper end portion of the stay are inserted and accommodated in the skin through the lower opening of the skin, and thereafter A foaming raw material is injected into the skin and expanded by foaming to form a foamed elastic material. In this case, it is considerably difficult to accommodate the combined body of the core material and the stay in the skin because of its size and shape. For this reason, it is conceivable that the dimension of the opening of the epidermis is set to be large. Protruding from the insertion hole is a troublesome work. That is, if the stay does not have a core material, the stay can be easily attached to the skin by inserting one end of the stay into the skin through one insertion hole and projecting the other through the other insertion hole. Set. However, the above-described method cannot be set in a stay in which a core member is provided at the erection part between both leg parts. Therefore, in the stay having the core material, the distal end side of both legs is inserted into the epidermis from the opening of the epidermis, both legs protrude outward from both insertion holes, and then the opening is greatly expanded, The core material is forced to fit inside the epidermis.

  Therefore, as described above, it is necessary to increase the size of the opening. However, when the foamed elastic material material is foamed, the foamed elastic material material is likely to leak from the opening, resulting in deterioration of the headrest quality. There was a thing. Nevertheless, since the left-right dimension of the opening cannot be made larger than the left-right dimension of the epidermis, a core material with a considerable vertical dimension is secured to stably support the heads of passengers of various physiques. It is difficult to house in the epidermis with the stay.

The present invention has been made paying attention to such problems existing in the prior art. Its purpose is to provide a headrest and its manufacturing method of the core material and the stay can be mounted readily accommodated within the epidermis.

In order to achieve the above object, the invention according to claim 1 accommodates a core material comprising a pair of front and rear clamping parts connected at the upper end portion from the lower opening of the bag-like skin into the skin. In addition, the upper end of the stay is accommodated in the epidermis via the stay insertion hole or opening in the lower part of the epidermis, and the leg portion of the stay protrudes out of the epidermis from the stay insertion hole, and then the core in the epidermis. wood and fixedly connected to the upper end of the stay, further by foaming expanded by injecting a foamed elastic material material in the epidermis, the headrest forming the pad portion so as to bury the upper and core of the stay In the manufacturing method , a connecting groove between the pair of holding parts of the core material is provided with a holding groove, and one holding part of the core material is formed to have a longer vertical dimension than the other holding part. And said one A pair of restricting projections are formed on both lower sides of the holding groove side surface of the holding portion, and when the core member is coupled and fixed to the upper end portion of the stay, the position of the stay in the left-right direction at the restricting projection The upper end of the stay is fitted into the sandwiching groove by moving the stay along the surface of the sandwiching groove in the one sandwiching portion in a state where the holding is restricted .

  According to a second aspect of the present invention, in the first aspect of the invention, the circumferential length of the opening of the skin is the same as or slightly larger than the circumferential length of the core material in the vertical direction. After the core material has been formed and rotated to the left or right, the core material is inserted into the epidermis through the opening of the epidermis from the one side end side, and then rotated in the epidermis to change the posture. It is characterized by.

The invention according to claim 3 accommodates the core material connected at the upper end portion from the lower opening of the bag-shaped skin into the skin, and via the stay insertion hole or opening at the lower part of the skin. The upper end of the stay is housed in the skin, and the leg of the stay protrudes from the stay insertion hole to the outside of the skin. After that, the core material is bonded and fixed to the upper end of the stay in the skin, and further, The headrest is formed by injecting a foamed elastic material and foaming and expanding to form a pad portion so as to embed the upper end portion and the core material of the stay, and the core material is connected at the upper end portion thereof. A sandwiching groove is provided in a connecting portion between the pair of sandwiching portions, and one of the sandwiching portions of the core member has a dimension in the vertical direction higher than that of the other sandwiching portion. Long and formed before The lower sides of the plane of the clamping groove side of one of the holding portions, characterized in that the pair of regulating protrusions are formed.

  In the invention described in claim 2, the dimension of the opening of the skin can be set to be smaller, and the foamed elastic material raw material can be more reliably suppressed from leaking from the opening.

  As described above, according to the present invention, the core material and the stay can be easily inserted and assembled in the skin, and the headrest can be manufactured efficiently.

(First embodiment)
Below, 1st Embodiment of this invention is described based on FIGS.
As shown in FIGS. 1 to 3, the headrest 11 of this embodiment includes a pad portion 12 and a headrest base material 13 in which a base end portion is embedded in the pad portion 12. The pad portion 12 accommodates the headrest base material 13 in a bag-shaped skin 14 and injects a foamed elastic material such as urethane foam into the skin 14 in a state where they are set in a molding die (not shown). By foaming and expanding, the foamed elastic material 15 is formed integrally with the skin 14.

  For example, the skin 14 is formed by sewing a circumferential skin material 14a cut into a predetermined shape into a cylindrical shape at both end edges, and a pair of side skin materials 14b and 14c on both sides of the circumferential skin material 14a. And it is formed so that it may become a bag shape as a whole. In the lower center of the skin 14, an opening 16 is formed for accommodating the post core material 19 of the headrest base material 13 in the skin 14 or injecting a foamed elastic material. At both ends of the opening 16, a pair of stay insertion holes 17 for inserting both leg portions 18 a of the post 18 on the base material 13 for headrest and projecting it out of the skin 14 are defined by stitches.

As shown in FIG. 4, the stay insertion hole 17 may be formed in the vicinity of both ends of the opening 16 slightly away from the opening 16.
As shown in FIGS. 1 to 3, the headrest base material 13 includes a front-side substantially inverted U-shaped stay 18, an upper end portion of both leg portions 18 a of the stay 18, and a bridge portion 18 b between both leg portions 18 a. It is comprised from the core material 19 which consists of thermosetting materials etc., such as hard foaming urethane, attached to those parts so that it may surround. The core material 19 has a function of crushing when a large impact is applied and absorbing the impact. The core member 19 has sandwiching portions 19a and 19b at the front and rear, and a sandwiching groove 19c that opens downward is formed between the sandwiching portions 19a and 19b. A pair of restricting protrusions 20 as restricting means are formed on both sides of the lower portion of the rear surface of the front holding portion 19a.

  Then, after the stay 18 and the core material 19 are accommodated in the outer skin 14, the upper end portions of the both leg portions 18 a of the stay 18 and the installation portion 18 b are inserted into the sandwiching groove 19 c of the core material 19 from the lower rear side. The core member 19 and the stay 18 are coupled and fixed by being inserted and clamped between the both clamping portions 19a and 19b. Here, the opening width of the lower opening of the clamping groove 19c is narrower than the outer diameter of the erection part 18b of the stay 18, and the erection part 18b in the state of being clamped to the clamping groove 19c can be easily detached. It is supposed not to. Further, both leg portions 18a of the stay 18 are engaged with the restricting projections 20, so that the positional relationship between the core member 19 and the stay 18 is restricted in the lateral (left and right) direction.

  Furthermore, in this embodiment, as shown in FIG. 5 (a), the skin 14 and the core material 19 are formed so as to have a substantially square shape. The lateral dimension of the skin 14 is L1, the vertical dimension of the skin 14 is L2, the length (left / right) dimension of the opening 16 is W1, the lateral dimension of the core material 19 is L3, and the vertical dimension of the core material 19 is. When L4 is L4, the relational expressions W1> L4, L3 ≧ L4, L2> L3, L1> L3 are established, and 2 × W1 ≧ (maximum circumferential length of the core member 19) is satisfied. ing. 2 × W1 represents the circumference of the opening 16. Accordingly, the circumferential length of the opening 16 is equal to or larger than the maximum circumferential length of the core member 19. Here, as will be apparent from the following description, the core material 19 passes through the opening 16 in the state shown in FIG. In this case, the circumferential length of the opening 16 may be, for example, 2 × W1 = (maximum circumferential length of the core material 19) 2 × W1> (the core material 19 of the core material 19) as long as it is a slippery material. Even in the case of the maximum circumferential length in the vertical direction, it is sufficient if there is a slight dimensional difference that allows the core material 19 to pass through the opening 16.

Next, the manufacturing method of the headrest 11 comprised as mentioned above is demonstrated.
When manufacturing the headrest 11, first, as shown in FIG. 5 (a), one side end of the headrest 19 is rotated in a state where the core 19 is rotated approximately 90 degrees to the left or right with respect to the direction of use. It is accommodated in the epidermis 14 through the opening 16 of the epidermis 14 from the part side. Subsequently, as shown in FIG. 5 (b), the core material 19 is rotated 90 degrees within the skin 14, and the posture is changed so as to match the vertical and horizontal directions of the skin 14. Further, as shown in FIGS. 5B and 5C, one leg 18a of the stay 18 is inserted into one stay insertion hole 17 of the skin 14 and the one leg 18a is connected to the skin 14 It protrudes outside from the inside through the other insertion hole 17.

  In this way, the stay 18 is accommodated in the skin 14, and both leg portions 18 a protrude from the stay insertion hole 17 to the outside of the skin 14. Next, as shown in FIG. 5C, in the skin 14, both the leg portions 18 a of the stay 18 are positioned between the restricting projections 20 to determine the positional relationship between the stay 18 and the core member 19, and The installation part 18 b is applied to the lower end of the sandwiching groove 19 c of the core member 19. Then, by inserting the erection part 18b into the clamping groove 19c from that state, the core member 19 and the stay 18 are coupled and fixed, and the headrest base material 13 is assembled. In this way, the stay 18 and the core material 19 can be assembled so as to have a correct positional relationship. Note that the installation portion 18b passes through the narrow lower end opening of the clamping groove 19c, so that a click feeling is given to the operator, and the completion of the assembly can be confirmed even if the inside of the skin 14 cannot be seen.

  Thereafter, with the skin 14 including the headrest base material 13 set in a molding die (not shown), a foamed elastic material such as urethane foam is injected into the skin 14 from the opening 16 and foamed and expanded. As a result, as shown in FIGS. 2 and 3, the foamed elastic material 15 is molded integrally with the skin 14 in a state of surrounding the core material 19 of the headrest base material 13, and the pad portion 12 of the headrest 11 is formed. The

  As described above, in the manufacturing method of the embodiment, after the core material 19 and the stay 18 are separately accommodated in the skin 14, the core material 19 and the stay 18 are bonded and fixed in the skin 14, and the headrest base material is obtained. 13 is assembled. In this case, after the core material 19 is accommodated in the skin 14 from the short side end portion of the vertical dimension L4 through the opening 16 of the skin 14, the core material 19 is rotated in the skin 14 to be positioned. change. For this reason, unlike the case where the headrest base material is housed in the epidermis in the assembled state, the core material is not required to be configured so that the direction dimension of the epidermal opening is set large and the opening 16 can be opened largely. 19 and the stay 18 can be smoothly accommodated in the skin 14. That is, in this embodiment, as described above, if 2 × W1 which is the circumferential length of the opening 16 is made equal to or slightly larger than the maximum circumferential length of the core member 19, the headrest 11 can be assembled. It becomes easy and it can prevent effectively that a foaming elastic material raw material leaks from the opening 16 at the time of injection foaming of a foaming elastic material raw material, and can prevent the quality-reduction of the headrest 11 being caused. Moreover, in this embodiment, since the lower part of the holding part 19b on the rear side of the core material 19 is cut out, even if the core material 19 is housed in the skin 14, By using the notch, the stay 18 can be easily passed through the skin 14.

  And since the installation part 18b of the stay 18 is gripped in the clamping groove 19c and both the leg parts 18a are regulated by the regulation projection 20, the foam 18 is expanded with respect to the stay 18 and the core material 19 when the foamed elastic material material is foamed. By resisting the foaming pressure acting as described above, both the members 18 and 19 can maintain their positional relationship by assembling them, thereby preventing the occurrence of defective products. Accordingly, the suspending portion 18b, the sandwiching groove 19c, and the restricting projection 20 constitute a maintaining means for maintaining the coupling relationship.

  Moreover, in the headrest 11 manufactured in this way, as shown in FIGS. 1 to 3, a core material 19 having an impact absorbing function is embedded in the center of the foamed elastic material 15 in the skin 14. Therefore, the occupant's head can be stably supported without greatly sinking, and when an impact caused by a rear collision is applied to the vehicle, the occupant's head hits the pad portion 12, and the core member 19 Crushing and absorbing impact.

The headrest 11 of the type shown in FIG. 4 has the same insertion method as the above-described method because the insertion hole 17 is only slightly spaced from the opening 16.
(Second Embodiment)
Next, a second embodiment of the present invention will be described with a focus on differences from the first embodiment.

  In the second embodiment, as shown in FIGS. 6 and 7, the sandwiching portions 19 a and 19 b of the core material 19 made of a thermoplastic resin having an impact absorbing function or the like are integrated at the upper edge, and the integrated thin hinge portion 25. It is connected so that opening and closing is possible. Further, a locking recess 26 is formed on the rear surface of one clamping portion 19a, and a locking projection 27 that can be engaged with the locking recess 26 is formed on the front surface of the other clamping portion 19b. Then, as shown in FIG. 7, after both the holding portions 19a and 19b are opened, the construction portion 18b of the stay 18 is inserted into the holding groove 19c between the both holding portions 19a and 19b, and then both the holding portions 19a. , 19b is closed, the locking recess 26 and the locking projection 27 are engaged, and the both clamping portions 19a, 19b are held in the closed state. Thereby, the erection part 18 b of the stay 18 is sandwiched between the both clamping parts 19 a and 19 b, and the core member 19 is coupled and fixed to the upper end part of the stay 18. As described above, the hinge between the upper ends of the sandwiching portions 19a and 19b may be the integral thin-walled hinge portion 25 or an adhesive tape attached between the upper ends of the sandwiching portions 19a and 19b. It may be a separate hinge.

  Therefore, also in the second embodiment, it is possible to obtain the same effect as that of the first embodiment. However, in this embodiment, when the stay 18 is passed through the skin 14, the space between the sandwiching portions 19 a and 19 b is used. Of course, in this case as well, it is easy to pass the stay 18 as in the first embodiment.

(Third embodiment)
Next, a third embodiment of the present invention will be described with a focus on differences from the first embodiment.
Now, in the third embodiment, as shown in FIG. 8, the rear holding portion 19b of the core material 19 is removed, and the holding groove 19c is formed to open rearward on the rear surface of the core material 19. Has been. The core member 19 is coupled and fixed to the upper end portion of the stay 18 by inserting and fitting the installation portion 18b of the stay 18 into the clamping groove 19c from the rear. Also in this case, it is desirable that the rear end opening of the sandwiching groove 19c be formed narrower than the outer diameter of the erection portion 18b of the stay 18.

In the third embodiment, the same effects as those of the first embodiment can be obtained.
(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described with a focus on differences from the first embodiment.

  Now, in the fourth embodiment, as shown in FIG. 9, the sandwiching groove 19c of the core member 19 is opened upward. Then, by inserting and fitting the installation portion 18 b of the stay 18 into the clamping groove 19 c from above, the installation portion 18 b of the stay 18 is held between the both holding portions 19 a and 19 b, and the core member 19 is positioned at the upper end of the stay 18. It is designed to be coupled and fixed to the part.

Also in the fourth embodiment, the same effect as that of the first embodiment can be obtained.
(Example of change)
In addition, this embodiment can also be changed and embodied as follows.

In the second embodiment, the hinge between the sandwiching portions 19a and 19b of the core member 19 is omitted, and the separate sandwiching portions 19a and 19b are assembled in the outer skin 14.
The outer skin 14 is made to be substantially circular on the front surface, and the pad portion 12 is configured to be substantially circular on the front surface.

  In each of the above embodiments, the stay 18 is accommodated in the skin 14 by passing one leg 18a of the stay 18 through one insertion hole 17 of the skin 14 and further projecting from the other insertion hole 17 to the outside. The installation portion 18b of the stay 18 is inserted into the skin 14 from the opening 16 of the skin 14, and then both the leg portions 18a of the stay 18 are projected to the outside through the insertion hole 17. Such a method is suitable when the vertical dimension of the skin 14 is large.

The perspective view which shows the headrest of 1st Embodiment. FIG. 2 is a side sectional view of the headrest of FIG. 1. Sectional drawing in the 3-3 line of FIG. The perspective view which shows the deformation | transformation structure of the headrest of FIG. (A)-(c) is sectional drawing which shows the assembly method of the headrest of FIG. 1 in order. Sectional drawing which shows the headrest of 2nd Embodiment. Sectional drawing which shows the assembly | attachment method of the dressless of FIG. Sectional drawing which shows the headrest of 3rd Embodiment. Sectional drawing which shows the headrest of 4th Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Headrest, 12 ... Pad part, 13 ... Base material for headrest, 14 ... Skin, 15 ... Foam elastic material, 16 ... Opening, 17 ... Stay insertion hole, 18 ... Stay, 18a ... Leg part, 19 ... Core material, 19a, 19b ... clamping part, 19c ... clamping groove.

Claims (3)

A core material comprising a pair of front and rear clamping parts connected at the upper end portion is accommodated in the epidermis from the lower opening of the bag-shaped epidermis, and inside the epidermis via the stay insertion hole or opening at the lower part of the epidermis The upper end of the stay is housed in the base, and the leg of the stay protrudes from the stay insertion hole to the outside of the skin, and then the core material is bonded and fixed to the upper end of the stay in the outer skin, and further, the foam is elastic in the outer skin. by foaming expanded by injecting a wood material, a headrest manufacturing method for molding the pad portion so as to bury the upper and core of the stay,
A connecting groove between the pair of holding parts of the core material is provided with a holding groove, and one of the holding parts of the core material is formed to have a longer vertical dimension than the other holding part, and the one A pair of restricting projections are formed on both sides of the lower part of the surface on the clamping groove side of the clamping part,
When the core member is coupled and fixed to the upper end portion of the stay, the position of the stay in the left-right direction is restricted by the restriction protrusion, and the surface of the one holding portion along the surface of the holding groove side. A method of manufacturing a headrest in which an upper end portion of the stay is fitted into the clamping groove by moving the stay . The circumference of the opening of the skin is formed so as to be the same as or slightly larger than the circumference of the core material in the vertical direction. The method for manufacturing a headrest according to claim 1, wherein the material is inserted into the epidermis from one end portion side through the opening of the epidermis and then rotated in the epidermis to change the posture. The core material connected at the upper end portion is accommodated in the skin from the lower opening of the bag-shaped skin, and the upper end portion of the stay is accommodated in the skin through the stay insertion hole or opening at the lower portion of the skin. Then, the legs of the stay protrude from the stay insertion hole to the outside of the skin, and then the core material is bonded and fixed to the upper end of the stay in the skin, and then foamed elastic material is injected into the skin and foamed. A headrest formed by forming a pad portion so as to embed an upper end portion and a core material of the stay by expanding,
  The core member is composed of a pair of front and rear holding parts connected at the upper end portion thereof, and a connecting groove between the pair of holding parts is provided with a holding groove, and one holding part in the core member is A headrest having a dimension in the vertical direction longer than that of the other sandwiching portion, and a pair of restricting protrusions formed on both lower sides of the surface on the sandwiching groove side of the one sandwiching portion.

Images