Vehicular headrest

Abstract

[Problem] To provide a vehicular headrest capable of positioning a head receiving part without rattling. [SOLUTION] In the vehicular headrest , either one of a fixing member 30 and a movable member 40 is used as a support shaft fixing member A1 to which a support shaft 50 is fixed, and the other member is used as a support shaft insertion member A2 provided with a pair of left and right support shaft insertion holes α1 in an elongated hole shape; and either one of the members is used as a regulation pin fixing member B1 to which a regulation pin 60 is fixed, and the other member is used as a regulation pin locking member B2 provided with a regulation pin passage α2 and a left and right pair of regulation pin locking recess parts α3 and α4. The regulation pin locking recess parts α3 and α4 or the regulation pin passage α2 is formed to become narrower toward the depth part. The movable member 40 is urged by means of an urging member 70 in a direction for locking the regulation pin 60 to the regulation pin locking recess parts α3 and α<sb / >4 or for locking the support shaft 50 to the support shaft insertion holes α1.

Description

Vehicle headrest

[0001] The present invention relates to a headrest for a vehicle, the head receiving portion of which can be set to an appropriate position depending on the physique of the user and the usage situation.

[0002] Known vehicle headrests that can be attached to seats in vehicles such as automobiles include those that are adjustable not only in vertical position (height) but also in front-to-back position (front-to-back adjustable headrests). In front-to-back adjustable headrests, when driving, the headrest is moved rearward to a position that does not interfere with driving, and when resting (when reclining the backrest), the headrest is moved forward and can be used like a pillow.

[0003] As an example of a front-rear position adjustment mechanism employed in a vehicle headrest, as shown in Fig. 3 of Patent Document 1, a latch-type front-rear position adjustment mechanism is known in which the position of a rotating member 40 (movable member) can be adjusted in multiple stages relative to a fixed member 30 by engaging a locking portion 31 with one of a plurality of locking portions 31a. The head receiving portion is provided integrally with the rotating member 40 (movable member).

[0004] 1 and 4 of Patent Document 2, a front-rear position adjustment mechanism for use in a vehicle headrest has been proposed, which includes a coil-shaped lock spring 51, a lock drum 52, and a lock switching mechanism 53, and switches between a state in which the lock spring 51 tightens the lock drum 52 and a state in which the lock spring 51 is loosened relative to the lock drum 52 using the lock switching mechanism 53, thereby enabling stepless adjustment of the front-rear position of the movable-side member 30 (movable member) relative to the fixed-side member 20 (fixed member) (spring lock-type front-rear position adjustment mechanism). The head receiving portion 40 is provided integrally with the rotating member 30 (movable member).

[0005] Patent No. 5976190 Publication Patent Application No. 2023-176481

[0006] However, vehicle headrests that use the latch-type or spring-lock-type front-rear position adjustment mechanisms described above have the problem that the positioned movable member (head support) is prone to rattle. In addition, they have the problem of requiring a large number of parts, making the structure complex and increasing manufacturing costs.

[0007] The present invention has been made to solve the above-mentioned problems, and provides a vehicle headrest that can position a movable member (head support portion) without any rattling, with a simple and easy-to-operate structure.

[0008] The above problem is solved by a vehicle headrest comprising: a stay provided in a state of protruding from an upper part of a seat back; a fixed member fixed to an upper part of the stay; a movable member attached in a state of being movable back and forth relative to the fixed member; a head receiving portion provided integrally with the movable member; a support shaft for supporting the movable member in a state of being movable back and forth relative to the fixed member; a restriction pin for restricting the back and forth movement of the movable member relative to the fixed member; and a biasing member, wherein either one of the fixed member and the movable member is a support shaft fixing member to which the support shaft is fixed, and the other member is a support shaft inserting member to which a pair of support shaft insertion holes for inserting the support shafts are provided on the left and right in the shape of elongated holes, and either one of the fixed member and the movable member is a restriction pin fixing member to which the restriction pin is fixed, The problem is solved by providing a vehicle headrest, characterized in that the other member is a regulating pin locking member provided with a pair of left and right regulating pin passages for passing the regulating pin when the movable member moves back and forth, and regulating pin locking recesses for locking the regulating pin at a predetermined position as it moves back and forth through the regulating pin passage, either the regulating pin locking recess or the support shaft insertion hole is formed to become narrower as it goes deeper, and the movable member is urged by a biasing member in a direction in which the regulating pin locks in the regulating pin locking recess or in a direction in which the support shaft locks in the support shaft insertion hole.

[0009] In the vehicle headrest of the present invention, the shaft fixing member and the shaft inserting member are different members (when one is a fixed member, the other is a movable member), and the restriction pin fixing member and the restriction pin locking member are also different members (when one is a fixed member, the other is a movable member). However, in terms of the relationship between the shaft fixing member and the shaft inserting member and the restriction pin fixing member and the restriction pin locking member, there are cases where the shaft fixing member is the restriction pin fixing member and the shaft inserting member is the restriction pin locking member, and cases where the shaft fixing member is the restriction pin locking member and the shaft inserting member is the restriction pin fixing member.

[0010] The vehicle headrest of the present invention is adjustable forward and backward, so that when driving, the head receiving portion can be moved rearward to a position that does not interfere with driving, and when resting, the head receiving portion can be moved forward and used like a pillow. Specifically, when the movable member (head receiving portion) is moved and the restricting pin passing through the restricting pin passage overlaps with the restricting pin locking recess, the movable member is moved by the biasing force of the biasing member, and the restricting pin is locked in the restricting pin locking recess or the support shaft is locked in the support shaft insertion hole. This allows the movable member (head receiving portion) to be locked in that position. The force locking the movable member can be increased by increasing the distance from the support shaft to the restricting pin or by increasing the biasing force of the biasing member. At least one of the restriction pin locking recess and the support shaft insertion hole is formed to narrow as it goes deeper, so that when the movable member (head receiving portion) reaches the set position, the restriction pin is wedged into the restriction pin locking recess, or the support shaft is wedged into the support shaft insertion hole, so that the movable member (head receiving portion) can be positioned (locked) without any rattle.

[0011] The movable member can be unlocked by moving the head rest in a direction (for example, forward in the headrest of FIG. 1, or upward in the headrests of FIG. 4 and FIG. 5) different from the normal load (which is normally a rearward load applied by the head on the head rest). This allows the movable member to be unlocked without operating an unlocking operating means such as a lever. Furthermore, since there is no need to provide an unlocking operating means, the structure can be simplified.

[0012] In addition, in the vehicle headrest of the present invention, the restriction pin locking member is provided with a pair of restriction pin passages and restriction pin locking recesses on the left and right sides, so the movable member can be supported in a balanced manner at two or more locations relative to the fixed member. This makes it possible to make the movable member and the fixed member less prone to twisting. It also distributes the load applied to the movable member. This also allows the material (such as steel plate) from which the movable member and the fixed member are formed to be thinner. This also makes it possible to reduce the weight of the vehicle headrest.

[0013] In the vehicle headrest of the present invention, a stopper for preventing the movable member from moving further forward or backward when it reaches the forward or rearward position may be provided on the fixed member, and a stopper receiving portion that abuts against the stopper when the movable member reaches the forward or rearward position may be provided on the movable member, so that when the stopper abuts against the stopper receiving portion, the movable member is sandwiched between the stopper and the restricting pin. In this case, the movable member is wedged between the stopper and the restricting pin, and the movable member (head receiving portion) can be positioned (locked) without any rattle.

[0014] In the vehicle headrest of the present invention, it is also preferable to provide a link member that connects the fixed member and the movable member while being pivotally supported by both the fixed member and the movable member, and to configure a link mechanism by which the movable member moves approximately parallel to the front and rear directions relative to the fixed member using the movable member, the fixed member, and the link member. Normally, four link joints are required to configure a link mechanism, but in the vehicle headrest of the present invention, the elongated support shaft insertion hole allows movement of one link joint, so that the same operation as a general link mechanism (four-link mechanism) can be achieved with three link joints (movable member, fixed member, and link member).

[0015] In the vehicle headrest of the present invention, it is also preferable that one of the pair of inner wall surfaces of the restricting pin locking recess is inclined at an angle (e.g., 20 to 40°) that allows slippage under a set load, thereby allowing the movable member (head support portion) to slip relative to the fixed member when a load equal to or greater than a predetermined value is applied to the movable member.

[0016] In the vehicle headrest of the present invention, it is also preferable that the head receiving portion is formed by a resin cover that encases a locking mechanism portion consisting of a fixed member and a movable member, a cushion material, and a skin that covers the outer surface of the cushion material, and that a recess with a vertical wall is formed in the center of the front surface of the resin cover, and the cushion material is fitted into the recess so that the cushion material abuts against the vertical wall, thereby preventing the cushion material from shifting in position relative to the resin cover.

[0017] This prevents the cushioning material from shifting relative to the resin cover. The recess with the vertical wall is located in the center of the front of the head rest, which is the area most likely to come into contact with the user's head. Therefore, cushioning can be enhanced only in the area of ​​the head rest where it is most needed.

[0018] As described above, the present invention makes it possible to realize a vehicle headrest that can position the movable member (head receiving portion) without rattle, with a simple and easy-to-operate structure.

[0019] Fig. 1 is a cross-sectional view showing a state in which the vehicle headrest of the first embodiment is cut along a plane perpendicular to the left-right direction. Fig. 2 is a diagram explaining a method of using the vehicle headrest of the first embodiment. Fig. 3 is a diagram showing a vehicle headrest of a second embodiment. Fig. 4 is a cross-sectional view showing a state in which the vehicle headrest of the second embodiment is cut along a plane perpendicular to the left-right direction. Fig. 5 is a side view showing a perspective view of the interior of the vehicle headrest of a third embodiment.

[0020] Embodiments of a vehicle headrest of the present invention will be described in more detail with reference to the drawings. Below, three embodiments, a first embodiment, a second embodiment, and a third embodiment, will be described as examples. However, these embodiments are merely preferred embodiments, and the technical scope of the vehicle headrest of the present invention is not limited to these embodiments. The vehicle headrest of the present invention can be modified as appropriate within the scope of the invention.

[0021] 1. Vehicle Headrest of First Embodiment First, a vehicle headrest of the first embodiment will be described. Fig. 1 is a cross-sectional view showing the vehicle headrest of the first embodiment cut along a plane perpendicular to the left-right direction. Fig. 1(a) shows a state in which the head receiving portion 10 is set to a front position and a middle position, and Fig. 1(b) shows a state in which the head receiving portion 10 is set to a rear position and an upper position. Fig. 2 is a diagram illustrating how to use the vehicle headrest of the first embodiment.

[0022] As shown in FIG. 1 , the vehicle headrest of the first embodiment includes a head receiving portion 10, a stay 20, a fixed member 30, a movable member 40, a support shaft 50, a restricting pin 60, and a biasing member 70.

[0023] As shown in Fig. 2, the head receiving portion 10 is a portion for receiving the user's head. The head receiving portion 10 is fixed in a state where it does not move relatively to the movable member 40, which will be described later. Therefore, when the movable member 40 moves, the head receiving portion 10 also moves integrally with the movable member 40. The shape of the head receiving portion 10 is not particularly limited, but in the vehicle headrest of the first embodiment, it is saddle-shaped (with an L-shaped cross section).

[0024] The stay 20 is a member for supporting the head receiving portion 10 and is provided in a state where it protrudes from the upper part of the seat backrest. The head receiving portion 10 is attached to the upper part of this stay 10 via a fixed member 30 and a movable member 40, which will be described later. As shown in FIGS. 1( a) and 1(b), the stay 20 is movable up and down relative to the seat backrest. This makes it possible to adjust the height of the head receiving portion 10. The form of the stay 20 is not particularly limited, but in the vehicle headrest of the first embodiment, the stay 20 is configured by a pair of left and right vertical support pillars and a horizontal support pillar that connects the upper ends of the vertical support pillars.

[0025] The fixing member 30 is fixed in a state where it does not move relatively to the upper part of the stay 20 (the horizontal support part of the stay 20, etc.). A support shaft 50, which will be described later, is fixed integrally to the fixing member 30. That is, in the vehicle headrest of the first embodiment, the fixing member 30 is fixed to the support shaft fixing member A. １ The support shaft 50 is a rod-shaped member that supports the movable member 40 relative to the fixed member 30 in a state that allows the movable member 40 to move back and forth.

[0026] In addition, a regulating pin 60 (described later) is also integrally fixed to the fixing member 30. That is, in the vehicle headrest of the first embodiment, the fixing member 30 is a regulating pin fixing member B １ The restricting pin 60 is a rod-shaped member that restricts the movement of the movable member 40 relative to the fixed member 30.

[0027] In the vehicle headrest of the first embodiment, the fixing member 30 has an inverted U-shape when viewed from the front, and includes a pair of left and right side plates and a top plate (connecting plate) connecting the upper edges of the side plates. The support shaft 50 and the regulating pin 60 are provided so as to bridge the pair of left and right side plates of the fixing member 30. This increases the rigidity of the fixing member 30.

[0028] The movable member 40 is attached to the fixed member 30 in a state where it can move back and forth relative to the fixed member 30. The movable member 40 has a support shaft insertion hole α １That is, in the vehicle headrest of the first embodiment, the movable member 40 is provided with the support shaft insertion member A ２ The shaft insertion hole α １ is a portion for inserting the support shaft 50. １ However, in the vehicle headrest of the first embodiment, the support shaft insertion hole α １ The distance between one end (front end) and the other end (rear end) is L in the vertical direction. １ Only the one shown in FIG. 1(a) is formed with a stepped structure.

[0029] The movable member 40 also has a restricting pin passage α ２ and the restricting pin locking recess α ３ , α ４ That is, in the vehicle headrest of the first embodiment, the movable member 40 is provided with a restricting pin locking member B ２ The restricting pin passage α ２ is a portion through which the restriction pin 60 passes when the movable member 40 is moved back and forth relative to the fixed member 30. ３ , α ４ is the restricting pin passage α ２ The restriction pin passage α is a portion for locking the restriction pin, which moves back and forth, at a predetermined position. ２ A restricting pin locking recess α is provided on one end of the ３ The other end has a restricting pin locking recess α ４ The restricting pin locking recess α ３ When the restricting pin 60 is engaged with the movable member 40 (head receiving portion 10), the movable member 40 (head receiving portion 10) is in a rearward position as shown in FIG. ４ When the head receiving portion 10 is engaged with the restricting pin 60, the movable member 40 (head receiving portion 10) is in a forward position where it protrudes forward, as shown in FIG. 1(a).

[0030] Restriction pin locking recess α ３ , α ４ However, in the vehicle headrest of the first embodiment, the restricting pin locking recess α ３The restricting pin locking recess α ４ Distance L ２ (Fig. 1(a)) is arranged forward. ４ When the head receiving portion 10 is locked by the restriction pin 60 (the head receiving portion 10 at the front position), the restriction pin locking recess α ３ is locked by the restricting pin 60 (the head receiving portion 10 at the rear position), the distance L ２ It is positioned just forward.

[0031] Restriction pin locking recess α ４ The width of the support shaft insertion hole α becomes narrower as it approaches the innermost portion (the front side in FIG. 1). １ 1A, when the head receiving portion 10 is in the forward position, the restricting pin locking recess α ４ The restricting pin 60 is engaged like a wedge into the support shaft insertion hole α when the head receiving portion 10 is in the rear position as shown in FIG. １ The support shaft 50 is wedged into one end (front end) of the head receiving portion 10, and the support shaft 50 is locked in a rattle-free state. This makes it possible to firmly position the movable member 40 when the head receiving portion 10 is in the forward or rearward position without rattle.

[0032] In the vehicle headrest of the first embodiment, the movable member 40 is formed in a U-shape in a front view and includes a pair of left and right side plate portions and a bottom plate portion (connecting plate portion) that connects the lower edges of the side plate portions. １ , and the restricting pin passage α ２ and the restricting pin locking recess α ３ , α ４ are provided in pairs on the left and right of each side plate portion of the movable member 40. This increases the rigidity of the movable member 40. In addition, the support shaft 50 is inserted into the support shaft insertion holes α at two locations on the left and right. １ The restricting pin 60 is supported by the restricting pin passage α ２ and the restricting pin locking recess α３ , α ４ This allows the load acting on the movable member 40, the support shaft 50, and the regulating pin 60 to be dispersed, making it possible to reduce the thickness of the movable member 40 and the weight of the vehicle headrest.

[0033] The biasing member 70 biases the movable member 40 to the restricting pin locking recess α ３ , α ４ In the vehicle headrest of the first embodiment, the biasing member 70 is a coil spring (tension spring) connected at one end to the resin cover 11 of the head receiving portion 10 and at the other end to the restricting pin 70, and biases the head receiving portion 10 in a direction to pull it rearward. The biasing member 70 urges the restricting pin 70 into the restricting pin locking recess α ４ or the support shaft 50 is inserted into the support shaft insertion hole α １ The locking mechanism is firmly locked in place like a wedge at the back of one end (front end) of the locking mechanism.

[0034] In the vehicle headrest of the first embodiment, the front-rear position of the head receiving portion 10 is adjusted as follows. As shown in Fig. 1(a), when the head receiving portion 10 is moved from the forward position to the rearward position, the head receiving portion 10 is grasped by hand and moved forward in the opposite direction to the normal load (the rearward load normally applied by the head to the head receiving portion 10) against the biasing force of the biasing member 70. Then, the restricting pin 60 engages with the restricting pin engaging recess α. ４ Removed from the control pin passage α ２ In this state, when the head receiving portion 10 is rotated downward about the support shaft 50 (rotation in a direction in which the front portion of the head receiving portion 10 moves downward), and the hand is released from the head receiving portion 10, the head receiving portion 10 moves rearward due to the biasing force of the biasing member 70, and the restricting pin locking recess α ３ is locked by the restricting pin 60. This allows the head receiving portion 10 to be locked in the rear position. By reversing this process, the head receiving portion 10 can be moved from the rear position to the front position.

[0035] As described above, when adjusting the front-rear position of the head receiving portion 10, it is necessary to move the movable member 40 back and forth relative to the support shaft 50. １ is formed in an elongated hole shape, the movable member 40 is allowed to move back and forth relative to the support shaft 50. As already mentioned, the support shaft insertion hole α １ The distance L １ Because of the step, the angle of the head receiving part 10 can be made to differ greatly when the head receiving part 10 is in the forward position and when it is in the rear position (the head receiving part 10 in the rear position can be rotated downward greatly).

[0036] As described above, the vehicle headrest of the first embodiment is capable of adjusting the front-to-rear position and angle of the head receiving portion 10 in addition to raising and lowering the head receiving portion 10 (adjusting the up-and-down position of the head receiving portion 10).

[0037] As a result, for example, when a tall person (e.g., an adult male) is seated in the seat to drive, the head rest 10 should be in the rear and upper position as shown in Fig. 2(a). On the other hand, when a person who is not so tall (e.g., an adult female) is seated in the seat, the head rest 10 should be in the rear and middle position as shown in Fig. 2(b). This allows the head rest 10 to be in an appropriate position when driving that does not interfere with driving.

[0038] Furthermore, when a tall person (e.g., an adult male) reclins the seat back to rest, it is recommended that the head support 10 be set to the forward and middle position as shown in Figure 2(c). On the other hand, when a person who is not so tall (e.g., an adult female) reclins the seat back to rest, it is recommended that the head support 10 be set to the forward and lower position as shown in Figure 2(d). This allows the user to rest with the lower back of their head supported by the head support 10, which can be used as a pillow. This improves comfort during rest.

[0039] 2. Vehicle Headrest of Second Embodiment Next, a vehicle headrest of a second embodiment will be described. The vehicle headrest of the second embodiment will be described mainly with respect to configurations that are different from the vehicle headrest of the first embodiment. Configurations of the vehicle headrest of the second embodiment that are not particularly mentioned can be substantially the same as those described for the vehicle headrest of the first embodiment.

[0040] Fig. 3 is a diagram showing a vehicle headrest of a second embodiment. Fig. 3(a) is a front view of the vehicle headrest as seen from the front, and Fig. 3(b) is a cross-sectional view of the front side of the vehicle headrest cut along the Z-Z plane in Fig. 3(a). Fig. 4 is a cross-sectional view showing the vehicle headrest of the second embodiment cut along a plane perpendicular to the left-right direction. Fig. 4(a) shows the head receiving portion 10 in the rear position, and Fig. 4(b) shows the head receiving portion 10 in the rear position.

[0041] In the vehicle headrest of the second embodiment, as shown in Fig. 4, the head receiving portion 10 has a generally elliptical cross section, and the lower portion of the head receiving portion 10 is configured to rotate back and forth around a support shaft 50 provided above (a downward swing structure). For this reason, the restriction pin 60 is disposed below the support shaft 50. In the vehicle headrest of the second embodiment, the angle θ by which the head receiving portion 10 can rotate back and forth is １ (FIG. 4(b)) shows the distance L that the head support 10 can move back and forth by about 20 to 30 degrees. ３ (FIG. 4(b)) is preferably set to about 60 to 70 mm.

[0042] Furthermore, in the vehicle headrest of the first embodiment, the fixing member 30 is a support shaft fixing member A １ and the restricting pin fixing member B １ The movable member 40 functions as a support shaft insertion member A. ２ and the restricting pin locking member B ２ However, in the vehicle headrest of the second embodiment, the fixing member 30 functions as the support shaft insertion member A. ２ and the restricting pin fixing member B １ The movable member 40 functions as a support shaft fixing member A. １ and the restricting pin locking member B２ That is, in the vehicle headrest of the second embodiment, the fixing member 30 has the support shaft insertion hole α １ The movable member 40 is provided with a support shaft 50 fixed thereto, and a restriction pin passage α ２ and the restricting pin locking recess α ３ , α ４ is provided.

[0043] In the vehicle headrest of the second embodiment, the fixing member 30 is provided with a stopper β １ is provided on the movable member 40, and the stopper receiving portion β ２ The stopper β １ and stopper receiving part β ２ As shown in FIG. 4(a), when the head receiving portion 10 reaches the rear position, the contact portions come into contact with each other to prevent the head receiving portion 10 from rotating further rearward.

[0044] In addition, in the vehicle headrest of the first embodiment, when the head receiving portion 10 is in the rear position, the restricting pin locking recess α ３ However, in the vehicle headrest of the second embodiment, when the head receiving portion 10 is in the rear position, the restricting pin locking recess α of the movable member 40 is ３ Inner wall surface α ５ and stopper receiving part β ２ The restriction pin 60 and the stopper β １ In the vehicle headrest of the second embodiment, the front-rear position of the head receiving portion 10 is adjusted by moving the head receiving portion 10 upward and locking the restricting pin locking recess α ３ Or the restricting pin locking recess α ４ However, after the head receiving portion 10 is released from the restricting pin 60, the head receiving portion 10 is rotated around the support shaft 50.

[0045] In addition, the restricting pin locking recess α ３ Inner wall surface α ５ angle θ ２When a load equal to or greater than a specified value (set load) is applied to the rotating member 40 due to the inclination, the restricting pin locking recess α ３ slips from the restriction pin 60 to the restriction pin locking recess α ３ In other words, the movable member 40 is designed to slip relative to the fixed member 30. As a result, for example, if the head receiving portion 10 is set to the rear position and the vehicle collides while driving, the head receiving portion 10 (movable member 40) will slip and move to the forward position, allowing the occupant's head to be protected more quickly. This improves the performance of the vehicle headrest. Angle θ ２ The specific value of is not particularly limited, but is usually set to about 20 to 40 degrees.

[0046] Furthermore, in the vehicle headrest of the second embodiment, as shown in FIG. 4, the head receiving portion 10 is formed by a resin cover 11 that encases the locking mechanism portion consisting of the fixed member 30 and the movable member 40, a cushion material 12, and a skin 13 that covers the outer surface of the cushion material. As shown in FIG. 3(b), a recess γ is formed in the center of the front surface of the resin cover 11, and the cushion material 12 is attached to the upright wall γ formed in the recess γ. １ This makes it possible to prevent the cushion material 12 from being displaced relative to the resin cover 11.

[0047] The cushion material 12 may be formed as a single unit, but in the vehicle headrest of the second embodiment, it is composed of a first cushion material 12a arranged along the inner surface of the skin 13 just inside the skin 13, and a second cushion material 12b arranged further inside the first cushion material 12a. The second cushion material 12b is provided only in the front center portion of the head receiving portion 12b (the area indicated by the cross-hatched area in FIG. 3(a)). The second cushion material 12b is formed thicker than the first cushion material 12a. This allows for increased cushioning only in the front center portion of the head receiving portion 12b, which is the area most likely to be hit by the user's head.

[0048] The cushion material 12 can be made from various materials having cushioning properties. Examples of materials for the first cushion material 12a include fabrics such as nonwoven fabrics and waste materials such as scraps. The second cushion material 12b can be made from waste materials such as urethane chips or recycled materials such as mixed resins. The thickness of the cushion material 12 is not particularly limited, but in the vehicle headrest of the second embodiment, the thickness of the first cushion material 12a is set to 3 mm and the thickness of the second cushion material 12b is set to 10 mm.

[0049] 3. Vehicle Headrest of Third Embodiment Next, a vehicle headrest of a third embodiment will be described. The vehicle headrest of the third embodiment will be described mainly with respect to configurations that are different from the vehicle headrest of the second embodiment. Configurations of the vehicle headrest of the third embodiment that are not particularly mentioned can be substantially the same as those described for the vehicle headrest of the first embodiment or the second embodiment.

[0050] 5A and 5B are perspective side views of the interior of a vehicle headrest according to a third embodiment, in which Fig. 5A shows the head receiving portion 10 in the rear position, and Fig. 5B shows the head receiving portion 10 in the forward position.

[0051] In the vehicle headrest of the third embodiment, similarly to the vehicle headrest of the second embodiment, the fixing member 30 is a support shaft insertion member A ２ and the restricting pin fixing member B １ The movable member 40 functions as a support shaft fixing member A. １ and the restricting pin locking member B ２ However, while the vehicle headrest of the second embodiment has a downward swinging structure, the vehicle headrest of the third embodiment is provided with a link member 80 as shown in Fig. 5, so that the head receiving portion 10 moves approximately parallel to the front-rear direction as indicated by the thick arrow in Fig. 5(a). The front-rear position of the head receiving portion 10 is adjusted by moving the head receiving portion 10 upward and rotating it about the support shaft 50, as in the vehicle headrest of the second embodiment.

[0052] One end (upper end) of the link member 80 is pivotally supported by a support shaft 50 fixed to the fixed member 30, and the other end (lower end) is pivotally supported at a predetermined position on the movable member 40. A pair of left and right link members 80 are provided. The link members 80 constitute a link mechanism by the movable member 40 and the fixed member 30. To constitute a link mechanism, four link joints are normally required, but in the vehicle headrest of the third embodiment, four link joints are provided by the elongated support shaft insertion holes α １ Since the link member 80 allows movement of one link joint, parallel movement is achieved with only three link joints. Note that by utilizing the fact that the lower end side of the link member 80 is pivotally supported at a predetermined position on the movable member 40, it is possible to rotate the movable member 40 and position the head receiving portion 10 in the forward position so that the lower part projects forward, as shown in Figure 4(b).

[0053] In the vehicle headrest of the second embodiment, as shown in FIG. 4, a stopper β that restricts rearward movement from the rear position is provided. １ and stopper receiving portion β ２ However, in the vehicle headrest of the third embodiment, as shown in FIG. 5, a stopper β １ and stopper receiving portion β ２ In addition, stopper ε １ and stopper receiving part ε ２ Stopper ε １ is provided on the fixing member 30, and the stopper receiving portion ε ２ is provided on the movable member 40. １ and stopper receiving part ε ２ As shown in FIG. 5B, when the head receiving portion 10 reaches the forward position, the movable member 40 comes into contact with the head receiving portion 10 and restricts the forward movement of the movable member 40 so that the head receiving portion 10 does not move further forward.

[0054] In the vehicle headrest of the third embodiment, as described above, the stopper ε that restricts the forward movement of the movable member 40 is １ and stopper receiving part ε ２ When the head receiving portion 10 reaches the front position, the restricting pin 60 and the stopper ε １ As a result, the restricting pin locking recess α of the movable member 40４ The left inner wall surface of the stopper receiving part ε ２ The two are sandwiched in a wedge shape.

[0055] REFERENCE SIGNS LIST 10 Head receiving portion 11 Resin cover 12 Cushion material 12a First cushion material 12b Second cushion material 13 Cover 20 Stay 30 Fixed member 40 Movable member 50 Support shaft 60 Restricting pin 70 Urging member 80 Link member A １ Support shaft fixing member A ２ Support shaft insertion member B １ Regulating pin fixing member B ２ Restriction pin locking member α １ Support shaft insertion hole α ２ Restriction pin passage α ３ Restriction pin locking recess α ４ Restriction pin locking recess β １ Stopper β ２ Stopper receiving part γ Recess γ １ Standing wall δ Cushion surface ε １ Stopper ε ２ Stopper receiving part

Claims

1. A vehicle headrest comprising: a stay protruding from the upper part of the seat back; a fixed member fixed to the upper part of the stay; a movable member attached so as to be movable back and forth relative to the fixed member; a head receiving portion integral with the movable member; a support shaft for supporting the movable member so as to be movable back and forth relative to the fixed member; a restriction pin for restricting the back and forth movement of the movable member relative to the fixed member; and a biasing member, wherein either the fixed member or the movable member is a support shaft fixing member to which the support shaft is fixed, and the other member is a support shaft insertion member to which a pair of elongated support shaft insertion holes for inserting the support shafts are provided on the left and right, and either the fixed member or the movable member is a restriction pin fixing member to which the restriction pin is fixed, a pair of left and right restriction pin locking members, each of which has a restriction pin passage for passing the restriction pin when the movable member moves back and forth, and a restriction pin locking recess for locking the restriction pin at a predetermined position as it moves back and forth through the restriction pin passage; either the restriction pin locking recess or the support shaft insertion hole is formed to become narrower as it approaches the back; and the movable member is biased by a biasing member in a direction in which the restriction pin is locked in the restriction pin locking recess or in a direction in which the support shaft is locked in the support shaft insertion hole.

2. A vehicle headrest as claimed in claim 1, wherein a stopper is provided on the fixed member to prevent the movable member from moving further forward or backward when it has reached the forward or rear position, and a stopper receiving part is provided on the movable member that abuts against the stopper when the movable member reaches the forward or rear position, and when the stopper abuts against the stopper receiving part, the movable member is sandwiched between the stopper and the restricting pin.

3. A headrest for a vehicle as claimed in claim 2, further comprising a link member that is pivotally supported on both the fixed member and the movable member and connects the fixed member and the movable member, and the movable member, fixed member and link member form a link mechanism that allows the movable member to move approximately parallel to the fixed member in the front-to-rear direction.

4. A vehicle headrest according to claim 1, wherein one of the pair of inner wall surfaces of the regulating pin engaging recess is inclined at an angle that causes slippage under a set load.

5. A vehicle headrest as claimed in any one of claims 1 to 4, wherein the head receiving portion is formed by a resin cover that encases a locking mechanism portion consisting of a fixed member and a movable member, a cushion material, and a surface covering the outer surface of the cushion material, and a recess with a standing wall is formed in the center of the front surface of the resin cover, and the cushion material is fitted into said recess and abuts against said standing wall, thereby preventing the cushion material from shifting in position relative to the resin cover.

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