JP7280808B2 - headrest - Google Patents

Description

The present invention relates to headrests.

2. Description of the Related Art As a headrest for a seat installed in a vehicle such as an automobile, a headrest capable of tilting in the longitudinal direction of the seat is known. This type of headrest generally consists of a stay held by the seat back, a headrest body tiltably supported around a tilting axis provided on the stay, and a lock mechanism for locking the headrest body at a desired tilt angle. An operation button for the lock mechanism is provided on the side surface of the headrest. The lock of the headrest body is released by operating the operation button (see Patent Document 1, for example).

JP 2012-201152 A

The operation button of the lock mechanism is housed in a cylindrical bezel, supported by the bezel so as to be movable in the axial direction of the bezel, and the bezel is attached to the headrest body. The operation button is pushed toward the inside of the headrest and urged in a direction opposite to the pushing direction by a coil spring. The tubular wall of the bezel is provided with a notch extending in the axial direction of the bezel, and the operation button is provided with a locking claw that engages with the notch of the bezel. The operation button is held by the bezel against the urging force due to the engagement between the locking pawl and the notch.

In the above configuration, when the operation button is assembled to the bezel, the opening of the bezel and the inner peripheral surface of the cylindrical wall connected to the opening rub against the locking claw of the operation button, causing the opening of the bezel and the inner circumference of the cylindrical wall to rub against each other. Scratches may remain on the surface. The bezel serves as decoration in addition to holding the operation buttons, and scratch marks on the opening of the bezel and the inner peripheral surface of the cylindrical wall may impair the appearance quality of the headrest.

In addition, when the operation button is pushed in, the notch provided in the cylindrical wall of the bezel may be exposed, and the interior of the headrest may be seen through the notch, which may impair the appearance quality of the headrest. .

SUMMARY OF THE INVENTION The present invention has been made in view of the circumstances described above, and an object of the present invention is to improve the appearance quality of a headrest.

A headrest according to one aspect of the present invention includes a stay held by a seat back, a headrest body supported so as to be tiltable about a tilting axis provided on the stay, and a lock portion for locking the headrest body so that it cannot be tilted. and an unlocking portion for unlocking the locking portion, the unlocking portion having an operation button, a cylindrical wall portion and a bottom wall portion, and being movably in the axial direction of the cylindrical wall portion. a bezel housing an operation button; and an urging member that urges the operation button pushed toward the bottom wall in a direction opposite to the pushing direction, wherein the operation button is attached to the bottom wall. The bezel has a locking portion that holds the operation button biased by the biasing member within the cylinder wall portion, and the connecting portion. and a communicating hole through which the bottom wall portion is inserted, and the locking portion and the communicating hole are arranged off the center of the bottom wall portion.

ADVANTAGE OF THE INVENTION According to this invention, the appearance quality of a headrest can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an example vehicle seat with a headrest for describing an embodiment of the present invention; FIG. 2 is a perspective view showing a part of the headrest of FIG. 1 cut away; 2 is a perspective view of an unlocking portion of the headrest of FIG. 1; FIG. FIG. 4 is a perspective view of the unlocking portion of FIG. 3 as seen from the back side; FIG. 4 is an exploded perspective view of the unlocking portion of FIG. 3; FIG. 4 is a perspective view showing a broken bezel of the unlocking unit of FIG. 3; FIG. 4 is a cross-sectional view of the unlocking portion of FIG. 3; It is a perspective view of the unlocking part of a reference example.

FIG. 1 shows an example of a vehicle seat with a headrest for describing embodiments of the present invention.

A seat 1 shown in FIG. 1 is a seat installed in a vehicle such as an automobile. The seat 1 includes a seat cushion 2 that supports the buttocks and thighs of an occupant seated on the seat 1, a seat back 3 that supports the waist and back of the occupant, and a headrest 4 that supports the neck and head of the occupant. Prepare.

The headrest 4 includes a stay 10 that forms the framework of the headrest 4 , and the stay 10 has a pair of leg portions 20 . The pair of leg portions 20 are spaced apart in the width direction of the seat 1 and protrude downward from the lower portion of the headrest 4 . The pair of legs 20 are inserted into the seat back 3 and held by the seat back 3 . The amount of insertion of the pair of leg portions 20 into the seat back 3 is variable, and the height of the headrest 4 is adjusted according to the amount of insertion of the pair of leg portions 20 .

The headrest 4 is tiltable in the front-rear direction of the seat 1, and its tilt angle can be adjusted. One side surface of the headrest 4 is provided with an operation button 30 that is operated by the passenger when adjusting the tilt angle of the headrest 4 .

FIG. 2 shows the internal structure of the headrest 4. As shown in FIG.

The headrest 4 includes the stay 10, a headrest body 11 tiltably supported by the stay 10, a lock portion 12 that locks the headrest body 11 so that it cannot tilt, and an unlocking portion 13 that unlocks the lock portion 12. and It is sufficient that the lock portion 12 is capable of preventing at least the rearward tilting of the seat between the forward tilting of the headrest body 11 and the rearward tilting of the seat.

The stay 10 has a pair of legs 20 , a connecting portion 21 connecting upper ends of the pair of legs 20 , and a tilting shaft 23 fixed to the connecting portion 21 via a bracket 22 . The headrest body 11 is tiltably supported around a tilting shaft 23 .

The headrest body 11 has a core 24 and a base plate 25 fixed to the core 24 . The core 24 is, for example, a molding made of synthetic resin, and the inside of the core 24 is hollow. The tilting shaft 23 of the stay 10 , the locking portion 12 and part of the unlocking portion 13 are accommodated inside the core 24 . The outside of the core 24 is covered with a cushion pad 26 and a skin material 27 . The base plate 25 is also housed inside the core 24 and is tiltably supported by the tilt shaft 23 of the stay 10 .

Lock portion 12 has ratchet 29 . A rotating shaft 28 is provided on the base plate 25 of the headrest body 11 , and the ratchet 29 is rotatably supported by the rotating shaft 28 . The bracket 22 holding the tilting shaft 23 of the base plate 25 is provided with teeth that mesh with the ratchet 29 . By engaging the ratchet 29 with the teeth of the bracket 22, the base plate 25 is locked so as not to tilt. The ratchet 29 is biased in a direction to mesh with the teeth of the bracket 22 by a biasing member (not shown).

The unlocking portion 13 has an operation button 30 (see FIG. 1) and a lever 32 . A pivot shaft 31 is provided on the base plate 25 of the headrest body 11 , and the lever 32 is rotatably supported by the pivot shaft 31 . A first end 32a of the lever 32 engages the ratchet 29 of the locking portion 12, and a second end 32b of the lever 32 is connected to the operation button 30. As shown in FIG.

When the operating button 30 is operated by the passenger, the second end 32b of the lever 32 is pushed through the operating button 30, and as a result the lever 32 is rotated. As the lever 32 rotates, the ratchet 29 rotates and the engagement between the ratchet 29 and the teeth of the bracket 22 is released. As a result, the base plate 25 is unlocked, the headrest body 11 becomes tiltable, and the tilt angle of the headrest body 11 is adjusted.

Then, when the operation of the operation button 30 is released, the biased ratchet 29 meshes with the teeth of the bracket 22, and the base plate 25 is again locked so as not to tilt. As a result, the tilt angle of the headrest body 11 is held at the adjusted angle.

3 to 7 show the unlocking portion 13. FIG.

The unlocking portion 13 has the operation button 30 described above, a bezel 33 that accommodates the operation button 30 , and a biasing member 34 that biases the operation button 30 .

The bezel 33 has a cylindrical wall portion 40 and a bottom wall portion 41 closing one end side of the cylindrical wall portion 40. The other end side of the cylindrical wall portion 40 is open. there is A flange portion 42 extending radially outward of the cylindrical wall portion 40 is provided at the other open end portion of the cylindrical wall portion 40 , and a pair of flange portions 42 extending in the axial direction of the cylindrical wall portion 40 are provided on the bottom wall portion 41 . A fixed claw 43 (fixed portion) is provided.

The headrest main body 11 is formed with mounting holes (not shown) penetrating through the skin material 27 , the cushion pad 26 , and the core 24 . The bezel 33 is fixed to the headrest main body 11 by inserting the bezel 33 into this mounting hole and engaging the pair of fixing claws 43 with the inner surface of the core 24 .

The operation button 30 has a pressure receiving portion 44 to be pressed by the passenger, a locked portion 45 locked by the bezel 33 , and a linking portion 46 connected to the lever 32 of the unlocking portion 13 . The pressure-receiving portion 44 is formed in a disc shape with a slightly smaller diameter than the cylindrical wall portion 40 of the bezel 33 and is arranged inside the cylindrical wall portion 40 . The engaged portion 45 and the linking portion 46 are provided on the back surface of the pressure receiving portion 44 facing the bottom wall portion 41 of the bezel 33 . The locked portion 45 and the linking portion 46 are formed in a columnar shape and are arranged parallel to the axial direction of the cylindrical wall portion 40 , that is, parallel to the moving direction of the operation button 30 based on the pressing operation, and are attached to the bottom wall portion 41 . extending towards.

A locking portion 47 for locking the locked portion 45 of the operation button 30 is provided on the bottom wall portion 41 of the bezel 33 , and the locking portion 47 has a locking hole 48 . A communicating hole 49 is also provided in the bottom wall portion 41 . By inserting the engaged portion 45 through the engaging hole 48 and inserting the connecting portion 46 through the connecting hole 49 , the operation button 30 can move in the axial direction of the cylindrical wall portion 40 inside the bezel 33 . ing.

The tip of the engaged portion 45 is arranged to protrude outside the bezel 33 through the locking hole 48 , and the tip of the linking portion 46 is arranged to protrude outside the bezel 33 through the linking hole 49 . A pair of claws 50 a and 50 b are provided at the tip of the locked portion 45 , and the pair of claws 50 a and 50 b are locked by a locking portion 47 . Thereby, the operation button 30 is prevented from coming off from the bezel 33 and held inside the bezel 33 . Further, the tip of the linking portion 46 is connected to the lever 32 (see FIG. 2) of the lock portion 12 .

The biasing member 34 is arranged between the pressure receiving portion 44 of the operation button 30 and the bottom wall portion 41 of the bezel 33, and pushes the pressure receiving portion 44 pushed toward the bottom wall portion 41 in a direction opposite to the pushing direction. is biased toward In this example, the biasing member 34 is a coil spring, which is wound around the locked portion 45 of the operation button 30 . As a result, tilting of the operation button 30 is suppressed, and movement of the operation button 30 becomes smooth. The biasing member 34 is not limited to a coil spring, and may be a cylinder made of an elastic material such as elastomer.

Since the locking portion 47 of the bezel 33 that locks the operation button 30 is provided on the bottom wall portion 41 of the bezel 33 instead of on the tubular wall portion 40, when the operation button 30 and the bezel 33 are assembled, The pair of claws 50a and 50b of the operation button 30 and the inner peripheral surface of the cylinder wall 40 do not rub against each other, and the appearance quality is prevented from deteriorating due to the scratch marks remaining on the opening of the bezel 33 and the inner peripheral surface of the cylinder wall 40. be done. Further, since the locking hole 48 and the connecting hole 49 of the locking portion 47 provided in the bottom wall portion 41 are always covered with the operation button 30, the inside of the headrest 4 can be seen through the locking hole 48 and the connecting hole 49. Visibility is prevented, and the degradation of appearance quality is also eliminated.

Here, in the reference example shown in FIG. It is In this reference example, the communication hole 49 is only provided in a part of the outer diameter portion of the bottom wall portion 41, and the space utilization efficiency in the bottom wall portion 41 is low.

On the other hand, in the unlocking portion 13 shown in FIGS. 3 to 7 , both the engaging portion 47 of the bezel 33 and the connecting hole 49 are provided off the center of the bottom wall portion 41 . As a result, the utilization efficiency of the space in the bottom wall portion 41 can be improved. From the viewpoint of improving the utilization efficiency of the space in the bottom wall portion 41 , preferably, the engaging portion 47 and the communicating hole 49 are arranged on opposite sides of each other with the center of the bottom wall portion 41 interposed therebetween. By effectively using the space in the bottom wall portion 41, the size of the unlocking portion 13 including the bezel 33 can be reduced.

3 to 7, the bottom wall portion 41 of the bezel 33 is divided into a first portion 41a, a second portion 41b, and a third portion 41c. A locking portion 47 is provided on the portion 41a, a communicating hole 49 is provided on the second portion 41b, and a pair of fixing claws 43 are provided on the third portion 41c. The first portion 41a is arranged farthest from the opening of the bezel 33 in the axial direction of the cylindrical wall portion 40 of the bezel 33, and the second portion 41b is closer to the opening of the bezel 33 than the first portion 41a. It's coming.

A linking portion 46 of the operation button 30 is connected to the lever 32 of the lock portion 12 through a linking hole 49 provided in the second portion 41b. Since the second portion 41b is closer to the opening of the bezel 33 than the first portion 41a, the entire bezel 33 can be brought closer to the lever 32, and the size of the headrest 4 can be reduced according to the specifications of the headrest 4. becomes.

FIG. 7 shows the configuration of the locking portion 47 provided in the first portion 41a. The locking portion 47 has a pair of locking walls 51a and 51b arranged in the locking hole 48. As shown in FIG. The pair of locking walls 51a and 51b sandwich the locked portion 45 of the operation button 30 inserted through the locking hole 48, and a pair of claws 50a and 50b provided at the tip of the locked portion 45. 50b. The locked portion 45 is locked by the locking portion 47 by engaging the pair of claws 50a and 50b with the pair of locking walls 51a and 51b.

Here, at least one of the pair of locking walls 51a and 51b is elastically flexible in a direction sandwiching the locked portion 45 of the operation button 30. In FIG. is flexibly formed. The tip portion of the locking wall 51b is connected to the bottom wall portion 41, whereas the tip portion of the locking wall 51a is separated from the bottom wall portion 41, so that the tip portion of the locking wall 51a and the bottom wall portion are separated. 41, a gap G is provided to allow the locking wall 51a to bend. Thereby, the locking wall 51a is formed to be flexible. In the reference example shown in FIG. 8, only one locking wall 51a is also formed to be flexible.

The locked portion 45 of the operation button 30 inserted between the pair of locking walls 51a and 51b is pressed against the locking wall 51b by the flexible locking wall 51a, and is pushed by the pair of locking walls 51a and 51b. sandwiched. As a result, the holding force of the locked portion 45 is increased, and sufficient holding force can be obtained even if the pair of locking walls 51a and 51b are small. In addition, it is possible to suppress the vibration of the operation button 30 and the noise accompanying the vibration.

Both of the pair of locking walls 51a and 51b may be formed to be flexible. , and the space required for installing the locking portion 47 becomes large. On the other hand, by forming only one of the locking walls 51a to be flexible, the space required for installation of the locking portion 47 can be reduced, and the unlocking portion 13 including the bezel 33 can be further miniaturized.

As shown in FIG. 4, from the viewpoint of improving the space utilization efficiency of the bottom wall portion 41, the pair of fixed claws 43 preferably has a first portion 41a provided with a locking portion 47 and a communicating hole 49. It is provided with the second portion 41b interposed therebetween. The pair of locking walls 51a and 51b of the locking portion 47 is defined as the direction in which the pair of fixed claws 43 face each other is defined as a first direction D1, and the direction in which the locking portion 47 and the communicating hole 49 are aligned is defined as a second direction D2. are provided to face a third direction D3 intersecting the first direction D1 and the second direction D2, and the locking wall 51a is formed to be flexible in the third direction D3. A gap G (see FIG. 7) is set between the tip portion of the locking wall 51a and the bottom wall portion 41 in order to allow the bending of the locking wall 51a. The gap G can be secured relatively easily in the limited space in the portion 41 . Thereby, the locking wall 51a can be enlarged, and the holding force of the locked portion 45 can be increased.

The vehicle seat 1 described above is not limited to a seat installed in a vehicle such as an automobile, and may be a seat installed in a vehicle other than a vehicle such as a ship or an aircraft.

As described above, the headrest disclosed in this specification includes a stay held by a seat back, a headrest main body supported so as to be tiltable about a tilting axis provided on the stay, and a headrest main body tilting. A locking portion that disables locking and an unlocking portion that unlocks the locking portion, wherein the unlocking portion has an operation button, a cylindrical wall portion, and a bottom wall portion, and the cylindrical wall portion a bezel that accommodates the operation button movably in the axial direction; and a biasing member that biases the operation button pushed toward the bottom wall in a direction opposite to the pushing direction, The operation button has a linking portion penetrating the bottom wall portion and linked to the lock portion, and the bezel retains the operation button urged by the urging member within the cylindrical wall portion. and a communicating hole through which the communicating part is inserted are provided in the bottom wall, and the engaging part and the communicating hole are arranged off the center of the bottom wall.

Further, in the headrest disclosed in this specification, the locking portion and the communication hole are arranged on opposite sides of each other with the center of the bottom wall portion interposed therebetween.

Further, in the headrest disclosed in this specification, the bottom wall portion has a first region in which the engaging portion is arranged and a second region in which the communicating hole is arranged, and the The second area is closer to the opening side of the bezel than the first area.

Further, in the headrest disclosed in the present specification, the operation button has a locked portion provided with a pair of claws, and the locking portion is arranged with the locked portion sandwiched therebetween. It has a pair of locking walls that engage with a pair of claws, and at least one of the pair of locking walls is elastically flexible in a direction that sandwiches the locked portion.

Further, in the headrest disclosed in this specification, the bezel has a pair of fixing portions fixed to the headrest main body on the bottom wall portion, and the pair of fixing portions includes the locking portion and the linking portion. The pair of locking walls are arranged to face each other with a hole interposed therebetween, and the pair of locking walls are arranged in a first direction in which the pair of fixing portions face each other and in a second direction in which the locking portion and the communicating hole are aligned. are arranged to face each other in a third inclined direction.

1 Vehicle seat 2 Seat cushion 3 Seat back 4 Headrest 10 Stay 11 Headrest body 12 Locking part 13 Unlocking part 20 Leg part 21 Connecting part 22 Bracket 23 Tilting shaft 24 Core 25 Base plate 26 Cushion pad 27 Skin material 28 Rotating shaft 29 Ratchet 30 Operation button 31 Rotating shaft 32 Lever 33 Bezel 34 Biasing member 40 Cylindrical wall portion 41 Bottom wall portion 42 Flange portion 43 Fixed claw 44 Pressure receiving portion 45 Locked portion 46 Linking portion 47 Locking portion 48 Locking hole 49 Linking hole 50a Claw 50b Claw 51a Locking wall 51b Locking wall

Claims (5)

a stay held by the seat back;
a headrest body tiltably supported around a tilting axis provided on the stay;
a locking portion that locks the headrest body so that it cannot tilt;
an unlocking unit that unlocks the lock unit;
with
The unlocking unit is
an operation button;
a bezel having a cylindrical wall portion and a bottom wall portion and housing the operation button movably in the axial direction of the cylindrical wall portion;
a biasing member that biases the operation button pushed toward the bottom wall in a direction opposite to the pushing direction;
including
the operation button has a linking portion penetrating the bottom wall portion and linked to the lock portion;
The bezel is
a locking portion that holds the operation button biased by the biasing member within the cylindrical wall portion;
a communicating hole through which the communicating portion is inserted;
on the bottom wall,
The headrest, wherein the engaging portion and the communicating hole are arranged off the center of the bottom wall portion. A headrest according to claim 1,
The locking portion and the communication hole are arranged on opposite sides of the bottom wall with the center of the bottom wall portion therebetween. The headrest according to claim 1 or 2,
The bottom wall portion
a first region in which the locking portion is arranged;
a second region in which the communicating hole is arranged;
has
The second area is a headrest that is closer to the opening side of the bezel than the first area. The headrest according to any one of claims 1 to 3,
The operation button has a locked portion provided with a pair of claws,
The locking portion has a pair of locking walls that engage with the pair of claws with the locked portion interposed therebetween,
At least one of the pair of locking walls is elastically flexible in a direction sandwiching the locked portion. A headrest according to claim 4,
The bezel has a pair of fixing portions fixed to the headrest body on the bottom wall portion,
The pair of fixing portions are arranged to face each other with the locking portion and the communicating hole interposed therebetween,
The pair of locking walls are arranged to face a third direction inclined with respect to a first direction in which the pair of fixing portions face each other and a second direction in which the locking portions and the communicating holes are aligned. .

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