JP2005088688A - Headrest - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a headrest which is set in an optimum condition and separately used according to the purpose of use. <P>SOLUTION: A headrest body is divided into a plurality of different pad parts 14A and 14B along the circumferential direction around the horizontal axis. A positioning mechanism 27 to selectively position the plurality of pad parts 14A and 14B to the position of use in contact with a head of an occupant by rotating the headrest body around the horizontal axis is provided. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a headrest mounted on an upper portion of a seat back in a vehicle or the like.

  In general, in this type of headrest, the headrest body is formed by filling an elastic body having an appropriate hardness and elasticity, such as a flexible urethane foam, and a certain degree of viscosity. The headrest body can protect the occupant's head when the vehicle collides.

In addition, a headrest having an additional function for supporting a passenger's head stably and making it easy to relax during a nap has been proposed (see, for example, Patent Document 1). In this conventional configuration, the headrest body is divided into a central pad portion and both side pad portions, and the both side pad portions are attached to the central pad portion so as to be rotatable in the front-rear direction around the vertical axis. . In addition, the head of the occupant can be stably supported from the rear and both sides while the both-side pad portions are rotated to the front position, and the soundproof effect can be enhanced by reducing the audible noise reaching the occupant. It can be done.
Japanese Patent Laid-Open No. 9-224777

  However, in this conventional headrest, the central pad portion and both side pad portions of the headrest main body are filled with an elastic body having an equivalent rebound resilience such as soft urethane foam, and thus have the same hardness. . For this reason, when trying to take a nap by turning the pad portions on both sides to the front position, the center pad portion and the pad portions on both sides are too hard or too bounced, which hinders sleep and relaxation. there were. In other words, the headrest of the vehicle seat is not suitable for other purposes such as a good night's sleep because the main purpose is to protect the passenger's head.

  The present invention has been made paying attention to such problems existing in the prior art. The object is to provide a headrest that can be set and used in an optimum state according to the purpose of use.

  In order to achieve the above object, the invention according to claim 1 is configured such that the headrest body is divided into a plurality of different types of pad portions in the circumferential direction around the horizontal axis, and the headrest body is formed. Rotating around the horizontal axis, positioning means is provided for positioning and arranging one of the plurality of pad portions at a use position where it can come into contact with the head of the occupant.

  According to a second aspect of the present invention, in the first aspect of the present invention, the positioning means alternatively positions one of a plurality of pad portions at a use position. .

  The invention according to claim 3 is the invention according to claim 1 or 2, wherein the headrest body is divided into a central rest portion and a side rest portion in the left-right direction along the horizontal axis, A portion is supported between the side rest portions so as to be rotatable around a horizontal axis, and the plurality of different types of pad portions are provided in the central rest portion.

According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the plurality of pad portions have different rebound resilience.
According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the plurality of pad portions have different viscoelastic moduli.

(Function)
In the invention described in claim 1, when changing to a different purpose of use such as normal vehicle driving or nap, the headrest body is rotated and the pad portion suitable for the purpose of use is positioned at the use position. be able to. Therefore, the headrest body can be set and used in a state optimal for the purpose of use, and the headrest can be used comfortably.

In the second aspect of the invention, the pad portion suitable for the purpose of use can be reliably disposed at the use position and used comfortably.
In the invention described in claim 3, the head of the occupant can be stably supported from the rear and both sides by the central rest portion and the side rest portion of the headrest body. Further, when the purpose of use is changed, the plurality of pad portions can be easily positioned and arranged at the use position by rotating the central rest portion between the side rest portions.

In a fourth aspect of the invention, during normal vehicle operation, the pad portion having a predetermined rebound resilience can be positioned at the use position to protect the occupant's head when the vehicle collides.
In the invention according to claim 5, at the time of a nap or the like, the pad portion having a predetermined viscoelastic modulus is positioned and arranged at the use position, and an effect of sleep and relaxation can be obtained.

  As described above, according to the present invention, it can be easily set to an optimum state according to the purpose of use and can be used properly.

(First embodiment)
Below, 1st Embodiment of this invention is described based on FIGS.
As shown in FIGS. 1 and 2, the headrest 11 surrounds a headrest stay 12 made of a metal bar, a metal pipe, or the like, and a base end of the horizontal shaft portion 12a and the both side leg portions 12b of the headrest stay 12. The headrest body 13 is disposed on the headrest body 13. The headrest body 13 is divided into three parts, a central rest part 14 and side rest parts 15 located on the left and right sides.

  As shown in FIG. 3, the headrest 11 is mounted on an upper portion of a vehicle seat back 16 at both leg portions 12 b of the headrest stay 12. In this state, the head rest of the occupant seated on the seat is stably supported from the rear and both sides by the central rest portion 14 and the side rest portion 15 of the headrest body 13.

  As shown in FIG. 2, both side rest portions 15 of the headrest body 13 are formed in a bag-like skin at the corner portion between both end portions of the horizontal shaft portion 12 a of the headrest stay 12 and the base end portions of both side leg portions 12 b. In a state where the material 17 is inserted, a foamed synthetic resin 18 such as soft urethane foam is injected into the skin material 17 and foamed to form a predetermined outer shape. Further, the central rest portion 14 of the headrest body 13 is rotatably supported around the horizontal shaft portion 12 a of the headrest stay 12 between the side rest portions 15.

  As shown in FIGS. 2 to 3, the central rest portion 14 is divided into two pad portions 14 </ b> A and 14 </ b> B along the circumferential direction centering on the horizontal shaft portion 12 a of the headrest stay 12. Yes. Among them, the first pad portion 14 </ b> A includes two mounting plates 19, 20 and a skin material 21, and a foamed synthetic resin 22 such as flexible urethane foam is injected between the mounting plates 19, 20 and the skin material 21. Then, it is molded to have a predetermined shape by foaming. The second pad portion 14B includes a single mounting plate 23 and a skin material 24, and is molded so as to have a predetermined shape by injecting a foamed synthetic resin 25 such as soft urethane foam between them and foaming them. Has been. In the drawings, the cross-sectional shapes of the first and second pad portions 14A and 14B are drawn in a semi-circular shape for easy understanding. Of curvature) is selected.

  As shown in FIGS. 3 and 4, the mounting plate 19 of the first pad portion 14 </ b> A has a shaft support recess 19 a that can be joined to the horizontal shaft portion 12 a of the headrest stay 12 extending in the longitudinal direction. Are formed at two locations near the left and right ends. Therefore, a total of two pairs of the locking holes 19b are formed. On the mounting plate 23 of the second pad portion 14B, a shaft support recess 23a that can be joined to the horizontal shaft portion 12a of the headrest stay 12 extends in the longitudinal direction, and a pair of each corresponding to the locking hole 19b. Locking claws 23b are provided near both ends.

  And as shown in FIG. 4, while the axial support recessed parts 19a and 23a of both pad part 14A, 14B are joined to the horizontal axis part 12a of the headrest stay 12 from both sides, each latching claw 23b respond | corresponds to them. It is engaged with the locking hole 19b. Thereby, both pad parts 14A and 14B are assembled | attached so that rotation around the horizontal-axis part 12a of the headrest stay 12 is possible.

  Surface fasteners 26A and 26B having a number of engaging projections are provided on the opposing surfaces of the mounting plates 19 and 23 of the first pad portion 14A and the second pad portion 14B. When both the pad portions 14A and 14B are rotatably assembled to the horizontal shaft portion 12a of the headrest stay 12, the surface fasteners 26A and 26B are engaged with each other, and the opposing surfaces of the mounting plates 19 and 23 are It is held in a joined state.

  As shown in FIG. 2, a positioning mechanism 27 as a positioning means is disposed between the central rest portion 14 of the headrest body 13 and the horizontal shaft portion 12 a of the headrest stay 12. That is, the mounting plate 23 of the second pad portion 14B is formed with a pair of hole-like accommodation portions 28 at two locations near both ends. A positioning ball 29 is accommodated in each accommodating portion 28 and is urged to move outward by a spring 30. A pair of positioning recesses 31 are equiangularly spaced in the circumferential direction (180 degrees in this embodiment) on the outer periphery of the horizontal shaft portion 12a of the headrest stay 12 so as to be able to engage with the positioning balls 29. Formed. The diameter of the tip opening of the housing portion 28 is slightly smaller than the diameter of the positioning ball 29 so that the positioning ball 29 does not jump out of the housing portion 28 due to the biasing force of the spring 30.

  When the central rest portion 14 of the headrest body 13 is rotated, the positioning ball 29 is engaged with one of the positioning recesses 31 in the circumferential direction by the urging force of the spring 30. Thereby, one of the first pad portion 14A and the second pad portion 14B of the central rest portion 14 is alternatively positioned and arranged at a use position on the vehicle front side that can come into contact with the head of the occupant. At this time, when the first pad portion 14A or the second pad portion 14B is positioned at the use position, the engagement between the positioning ball 29 and the positioning recess 31 gives a click feeling to the operator's sense. It has become so.

  In the headrest body 13 of this embodiment, the first pad portion 14A and the second pad portion 14B of the central rest portion 14 have different rebound resilience, hardness, and viscoelasticity, and the first pad portion 14A and both sides thereof. The part rest part 15 is formed so that the resilience elastic modulus, hardness and viscoelastic modulus are equal. That is, foamed synthetic resins 22, 18 such as soft urethane foam having predetermined rebound resilience, hardness and viscoelasticity are injected and foamed inside the first pad portion 14A and the side rest portions 15. . On the other hand, the second pad portion 14B of the central rest portion 14 has a low resilience modulus and hardness compared to the first pad portion 14A and the foamed synthetic resins 22 and 18 of the both side rest portions 15, and is viscoelastic. It is formed by injecting foamed synthetic resin 25 having a high rate to cause foaming.

  In this embodiment, in the standard defined in JIS K 6400, the resilience elastic modulus of the foamed synthetic resins 22 and 18 of the first pad portion 14A and the side rest portion 15 is about 45 to 40%, and the viscoelastic modulus is 0.2. The rebound resilience of the foamed synthetic resin 25 of the second pad portion 14B is about 20 to 5% and the viscoelasticity is about 0.3 to 0.9. The difference in hardness between the foamed synthetic resins 22, 18, and 25 is substantially equal to the difference in the resilience modulus.

  By the way, in the case of a pillow, if the rebound resilience is too high and bounces too much, the muscles are stimulated in an unstable manner every time you roll over, and disturb sleep. On the other hand, if the pillow is too soft, it stabilizes the posture when sleeping and also prevents sleep. Therefore, in the headrest main body 13 of this embodiment, the second pad portion 14B of the central rest portion 14 used for nap or the like has appropriate elasticity and viscosity, is not too soft, not too hard, and does not bounce too much. To be comfortable to use.

Next, the operation of the headrest 11 configured as described above will be described.
Now, during normal vehicle operation, as shown in FIG. 3, the first pad portion 14 </ b> A of the central rest portion 14 of the headrest body 13 is disposed at a use position on the vehicle front side that can come into contact with the head of the occupant. At this time, the positioning ball 29 of the positioning mechanism 27 is engaged with the positioning recess 31, and the central rest portion 14 is positioned and held at its use position. Therefore, if the headrest 11 is used in this state, the occupant's head can be effectively protected by the first pad portion 14A having a predetermined rebound resilience and hardness in the event of a vehicle collision or the like.

  Further, when taking a nap or relaxing while seated on the vehicle seat, as shown in FIG. 5, the center rest portion 14 is rotated to move the second pad portion 14B to the use position on the vehicle front side. To place. Then, due to the engagement between the positioning ball 29 and the positioning recess 31, the central rest portion 14 is positioned and held at its use position. If the headrest 11 is used in this state, it is possible to obtain sleep and relaxation by the second pad portion 14B having a reasonably low rebound resilience and hardness and a reasonably high viscoelasticity. In particular, an elastic body exhibiting a moderately high viscoelastic modulus maintains its repulsive pressure at a low value regardless of the strength of the pressing force, even when the pressing force is extremely strong or weak, even if it is deformed by pressing. And its value hardly changes. For this reason, the repulsive pressure does not act much on the human body, the human body can be supported in a wide area, the body pressure dispersibility is good, and the comfort is excellent.

Therefore, according to this embodiment, the following effects can be obtained.
(1) In this headrest, the headrest main body 13 is divided into a plurality of pad portions 14A and 14B having different configurations along a circumferential direction centering on the horizontal axis. Then, a positioning mechanism 27 is provided for rotating the headrest body 13 around the horizontal axis so that one of the plurality of pad portions 14A, 14B can be positioned at a use position where the headrest body 13 can contact the head of the occupant. Yes. For this reason, the headrest body 13 can be rotated and the pad portions 14A and 14B suitable for the purpose of use can be positioned and arranged at the use position. Therefore, the headrest main body 13 can be easily used properly corresponding to a plurality of purposes.

  (2) In this headrest, side rest portions 15 are provided on both sides of the central rest portion 14, and the side rest portions 15 have characteristics of high rebound resilience and hardness. Can be stably supported so as not to deviate from the headrest.

  (3) In this headrest, the hardness of the first and second pad portions 14A and 14B is different. For this reason, during normal vehicle operation, the pad portion 14A having a high rebound resilience and hardness can be positioned and disposed at the use position, so that the occupant's head can be reliably protected during a vehicle collision or the like. Further, when the vehicle is parked and taking a nap, the pad portion 14B having a low rebound resilience and hardness and a high viscoelasticity can be positioned and placed at the use position, so that an effect of sleep and relaxation can be obtained.

(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 FIG. 6, the first pad portion 14 </ b> A of the central rest portion 14 in the headrest main body 13 includes a substantially semi-cylindrical central portion 34 and a concave portion 35 a corresponding to the central portion 34. It is divided into a substantially semicircular cylindrical outer peripheral portion 35 having The central portion 34 is formed by fixing a pair of mounting plates 36 and 37 to each other along their side edges. A shaft support recess 36a is formed in the inner mounting plate 36 so as to extend in the longitudinal direction, and a pair of screw holes 36b project from two positions near both ends. The outer peripheral portion 35 is formed by injecting a foamed synthetic resin 39 such as a flexible urethane foam into a bag-shaped skin material 38 and foaming the same.

  The second pad portion 14B of the central rest portion 14 is configured by being divided into a substantially semi-cylindrical center portion 40 and a substantially semi-cylindrical outer peripheral portion 41 having a recess 41a corresponding to the center portion 40. . The center portion 40 is formed by fixing a pair of mounting plates 42 and 43 along both side edges. A shaft support recess 42a is formed in the inner mounting plate 42 so as to extend in the longitudinal direction, and a pair of insertion holes 42b and 43a are formed in the mounting plates 42 and 43 at two locations near both ends. .

The outer peripheral portion 41 is molded by injecting and foaming a foamed synthetic resin 45 such as a low resilience elastic foam into a bag-like skin material 44.
The shaft support recesses 36a and 42a of the center portions 34 and 40 of the pad portions 14A and 14B are joined to the horizontal shaft portion 12a of the headrest stay 12 from both sides, and the screw holes 36b are inserted from the insertion holes 43a and 42b. A plurality of screws 46 are screwed together. As a result, the central portions 34 and 40 of the pad portions 14A and 14B are assembled around the horizontal shaft portion 12a of the headrest stay 12 so as to be rotatable. Thereafter, the outer peripheral portions 35 and 41 are fixed to the outer peripheral surfaces of the central portions 34 and 40 by bonding or the like, whereby the first pad portion 14A and the second pad portion 14B are formed.

Therefore, also in the second embodiment, the same effects as the effects described in (1) to (3) in the first embodiment can be obtained.
(Example of change)
In addition, this embodiment can also be changed and embodied as follows.

In the first embodiment, the hook-and-loop fasteners 26A and 26B are omitted.
-The headrest body 13 is divided into a plurality of pad portions having different configurations along the circumferential direction around the horizontal axis, without dividing the headrest body 13 into the center rest portion 14 and the side rest portion 15. Divide and configure.

-The center rest part 14 of the headrest body 13 or the entire headrest body 13 is divided into three or more pad parts having different purposes of use.
The central rest portion 14 of the headrest body 13 or the entire headrest body 13 is divided into a plurality of pad portions having different skin materials, or divided into a plurality of pad portions having different surface shapes. It is embodied in a manner different from the first and second embodiments.

The perspective view which shows the headrest of 1st Embodiment. The principal part expanded horizontal sectional view of the headrest of FIG. The principal part expansion longitudinal cross-sectional view of the headrest of FIG. Sectional drawing which shows the headrest of FIG. 3 in an exploded state. Sectional drawing which shows the different use condition of the headrest of FIG. The principal part exploded sectional view showing the headrest of a 2nd embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Headrest, 12 ... Headrest stay, 12a ... Horizontal shaft part, 13 ... Headrest main body, 14 ... Center rest part, 14A ... 1st pad part, 14B ... 2nd pad part, 15 ... Side part rest part, 22 ... Soft Foamed synthetic resin of the first pad portion made of urethane foam or the like, 25... Foamed synthetic resin of the second pad portion made of low resilience foam or the like, 27... Positioning mechanism as positioning means, 29. 39 ... Foam synthetic resin of the first pad part made of soft urethane foam, etc. 45 ... Foam synthetic resin of the second pad part made of low resilience foam etc.

Claims (5)

The headrest body is divided into a plurality of pad parts of different types in the circumferential direction around the horizontal axis, and the headrest body is rotated around the horizontal axis so that one of the pad parts A headrest provided with positioning means for positioning and positioning the vehicle at a use position where it can come into contact with the head of an occupant. 2. The headrest according to claim 1, wherein the positioning unit selectively positions one of a plurality of pad portions at a use position. The headrest body is divided into a central rest portion and a side rest portion in the left-right direction along the horizontal axis, and the central rest portion is supported between the side rest portions so as to be rotatable around the horizontal axis, 3. The headrest according to claim 1, wherein pad portions of different types are provided in the central rest portion. The headrest according to any one of claims 1 to 3, wherein the plurality of pad portions have different resilience elastic moduli. The headrest according to any one of claims 1 to 4, wherein the plurality of pad parts have different viscoelastic moduli.

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