Vehicle seat

Abstract

To obtain a vehicle seat which can suppress occurrence of abnormal noise in a seat cushion due to vibration of a vehicle.SOLUTION: A vehicle seat 10 includes: a seat cushion main portion 16 which forms a portion of a seat cushion 12 that supports the buttocks of a seated occupant from a seat lower side; and an extension portion 18 which forms another portion of the seat cushion 12 and is provided at a front end side of the seat cushion main portion 16. A length of the seat cushion 12 in a seat front-rear direction is adjusted by the extension portion 18 being displaced in the seat front-rear direction. A weight 28 is provided within the extension portion 18. The weight 28 is provided within the extension portion 18 in a state that the weight 28 is displaceable in a vertical direction relative to the extension portion 18.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a vehicle seat. [Background technology]

[0002] The following Patent Document 1 discloses a vehicle seat equipped with a cushion length adjustment function that enables the cushion length of the seat cushion that supports the buttocks of a seated occupant to be adjusted. The seat cushion described in this document includes a retraction member that spans between a seam of the cushion cover and the rear of the cushion, and a push-in member that is provided at the front of the cushion. The push-in member applies a pressing force to the retraction member as the front of the cushion approaches the rear of the cushion, thereby pulling the cushion cover into the gap between the front and rear of the cushion via the retraction member. This allows the cushion cover to appropriately follow changes in cushion length. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2023-64925 Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, the configuration described in Patent Document 1 above is useful from the viewpoint of being able to allow the cushion cover to appropriately follow changes in cushion length, but does not take into consideration suppressing the generation of abnormal noise in the seat cushion due to vehicle vibrations.

[0005] SUMMARY OF THE INVENTION In consideration of the above, an object of the present invention is to provide a vehicle seat that can suppress the generation of abnormal noise from the seat cushion due to vibrations of the vehicle. [Means for solving the problem]

[0006] The vehicle seat of the first embodiment comprises a seat cushion main body that forms part of the seat cushion that supports the buttocks of a seated occupant from the underside of the seat, an extension that forms another part of the seat cushion and is provided at the front end side of the seat cushion main body, and that can be displaced in the fore-and-aft direction of the seat to adjust the length of the seat cushion in the fore-and-aft direction of the seat, and a weight that is provided inside the extension so that it can be displaced in the up-and-down direction relative to the extension.

[0007] In a vehicle seat according to a first aspect, the buttocks of a seated occupant are supported from below the seat by a seat cushion. The seat cushion includes a seat cushion main body and an extension provided at the front end of the seat cushion main body. The extension displaces in the seat front-rear direction, thereby adjusting the length of the seat cushion in the seat front-rear direction. A weight is provided inside the extension. The weight is vertically displaceable relative to the extension. In this configuration, when vehicle vibrations are transmitted to the extension, the weight moves independently of the extension and functions like a dynamic damper. This suppresses vibration of the extension relative to the seat cushion main body. In this way, the vehicle seat according to the first aspect can suppress abnormal noise from the seat cushion caused by vehicle vibrations.

[0008] The vehicle seat of the second aspect is the vehicle seat of the first aspect, in which at least one of the inner surface of the space in which the weight is provided in the extension portion and the outer surface of the weight is covered with a cushioning member that can absorb impact.

[0009] In the vehicle seat of the second aspect, at least one of the inner surface of the space in the extension where the weight is provided and the outer surface of the weight is covered with a cushioning material that can absorb impact. This configuration prevents or suppresses direct contact between the inner surface of the space in the extension where the weight is provided and the outer surface of the weight. This makes it possible to prevent or suppress the generation of abnormal noise that would otherwise occur if the inner surface of the space in the extension where the weight is provided and the outer surface of the weight were to come into direct contact.

[0010] The vehicle seat of the third aspect is a vehicle seat of the first or second aspect, wherein the extension portion includes an extension portion main body that forms a space in which the weight is placed and has a weight placement recess that is open on the underside of the seat, and a closing member that closes the open end side of the weight placement recess when attached to the underside of the seat of the extension portion main body, and the closing member is formed in a sheet shape and using a material that is flexibly deformable in its thickness direction.

[0011] In a third aspect of the vehicle seat, a weight is placed in a weight placement recess of the extension body. A closing member is attached to the seat lower side of the extension body. The open end of the weight placement recess is closed by the closing member. The weight is supported from the seat lower side by the closing member. The closing member is formed in a sheet shape using a material that is flexible and deformable in its thickness direction. This configuration allows the closing member to damp movement of the weight in the up-down direction of the seat.

[0012] A fourth aspect of the vehicle seat is the vehicle seat of the third aspect, wherein the closing member is formed with an opening through which the weight stored in the weight placement recess can be seen.

[0013] In the vehicle seat of the fourth aspect, an opening through which the weight stored in the weight-arranging recess can be seen is formed in the closing member. With this configuration, it is possible to check through the opening formed in the closing member whether or not a weight has been left in the weight-arranging recess during the assembly process of the extension part. [Effects of the Invention]

[0014] The vehicle seat according to the present invention has the excellent effect of suppressing the generation of abnormal noise from the seat cushion due to vibrations of the vehicle. [Brief explanation of the drawings]

[0015] [Figure 1]1 is a side view schematically showing a vehicle seat according to an embodiment of the present invention; [Figure 2] FIG. 4 is an exploded perspective view showing an extension portion of the seat cushion; [Figure 3] 4 is a cross-sectional view showing a cross section of an extension portion of the seat cushion taken along the front-rear direction and the up-down direction. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0016] 1 to 3, a vehicle seat 10 according to an embodiment of the present invention will be described. In the drawings, the arrow FR indicates the front side of the seat, the arrow UP indicates the upper side of the seat, the arrow LH indicates the left side in the seat width direction, and the arrow RH indicates the right side in the seat width direction. In the following description, unless otherwise specified, when referring to front-rear, up-down, and left-right directions, these refer to front-rear in the seat front-rear direction, up-down in the seat up-down direction, and left-right in the seat width direction.

[0017] 1, a vehicle seat 10 of this embodiment includes a seat cushion 12 that supports the buttocks of a seated occupant from below, and a seat back 14 that supports the back of the seated occupant from behind. The seat cushion 12 includes a seat cushion main body 16, an extension 18 supported by the seat cushion main body 16 at the front end side of the seat cushion main body 16, and a drive unit (not shown) that displaces the extension 18 in the front-rear direction relative to the seat cushion main body 16. The extension 18 is displaced in the front-rear direction by the drive unit, thereby adjusting the length L of the seat cushion 12 in the front-rear direction.

[0018] As shown in Figures 2 and 3, the extension 18 is composed of an extension body 20 formed in a block shape, a buffer member 22 fixed to the extension body 20, a closing member 24 fixed to the extension body 20 via the buffer member 22, and a pair of connecting plates 26 fixed to the extension body 20.

[0019] The extension body 20 is formed, for example, using urethane or the like in the shape of a rectangular block with its longitudinal direction extending in the left-right direction. The surface of the extension body 20 that is visible to vehicle occupants is covered with a skin (not shown). A pair of weight placement recesses 20A are formed in the lower part of the extension body 20, forming spaces for placing a pair of weights 28 (described later). These weight placement recesses 20A have the same shape and dimensions, are open toward the seat bottom, and are rectangular when viewed from below. The boundary between the bottom surface 20A1 of the weight placement recess 20A and the side surface 20A2 rising downward from around the bottom surface 20A1 is gently curved. The four corners 20A3 of the weight placement recess 20A are also gently curved.

[0020] The buffer member 22 is formed, for example, using a thin cloth or felt that can absorb impact. The buffer member 22 includes a pair of recess interior covering portions 22A that respectively cover the inner surfaces of the pair of weight placement recesses 20A in the extension body 20, and an end surface covering portion 22B that covers the end surfaces on the open end sides of the pair of weight placement recesses 20A in the extension body 20. The buffer member 22 may be fixed to the extension body 20 during molding of the extension body 20, or may be fixed to the extension body 20 after molding of the extension body 20.

[0021] As an example, the closing member 24 is formed using a sheet-like felt that is thicker than the buffer member 22 and flexible in the thickness direction. The outer shape of the closing member 24 when viewed from below corresponds to the outer shape of the end surface covering portion 22B of the buffer member 22. The closing member 24 is joined to the end surface covering portion 22B of the buffer member 22 fixed to the extension portion main body 20. As a result, the closing member 24 is fixed to the extension portion main body 20 via the buffer member 22. Furthermore, when the closing member 24 is fixed to the extension portion main body 20, the open ends of the pair of weight placement recesses 20A are closed by the closing member 24. As a result, spaces are formed between the pair of weight placement recesses 20A and the closing member 24 in which a pair of weights 28, described below, are placed. Furthermore, circular openings 24A are formed in the front-rear and left-right central portions of the portions of the closing member 24 that close the open ends of the pair of weight placement recesses 20A.

[0022] The pair of connecting plates 26 are formed in a triangular shape when viewed from below. The pair of connecting plates 26 are fixed to both left and right ends of the lower part of the extension main body 20. The pair of connecting plates 26 are connected to a pair of support members extending from the seat cushion main body 16 side.

[0023] A pair of weights 28 are provided between the extension body 20 (buffer member 22) and the closing member 24. The pair of weights 28 are formed using steel, lead, or the like to have a predetermined weight. In this embodiment, the pair of weights 28 have the same shape, dimensions, and weight. In addition, the weight 28 in this embodiment is formed in a plate shape with the thickness direction in the vertical direction and is formed in a rectangular shape when viewed from the vertical direction. In addition, the four corners 28A of the weight 28 have a gently curved shape. One of the pair of weights 28 described above is disposed in a space formed between one weight-arranging recess 20A formed in the extension body 20 and the closing member 24. In addition, the other of the pair of weights 28 is disposed in a space formed between the other weight-arranging recess 20A formed in the extension body 20 and the closing member 24.

[0024] 3, when weight 28 is disposed in the space formed between weight-arranging recess 20A and closing member 24, there is a slight clearance in the front-to-back and left-to-right directions between weight 28 and side surface 20A2 of weight-arranging recess 20A (inner-recess covering portion 22A of buffer member 22). Also, when weight 28 is disposed in the space formed between weight-arranging recess 20A and closing member 24, there is a clearance in the up-down direction between weight 28 and bottom surface 20A1 of weight-arranging recess 20A (inner-recess covering portion 22A of buffer member 22) that is about 3 to 4 times the thickness of weight 28.

[0025] (Actions and Effects of This Embodiment) Next, the operation and effects of this embodiment will be described.

[0026] 1 to 3, in the vehicle seat 10 of the present embodiment described above, the buttocks of a seated occupant are supported from below the seat by the seat cushion 12, and the back of the seated occupant is supported from behind by the seat back 14. The seat cushion 12 includes a seat cushion main body 16 and an extension 18 provided on the front end side of the seat cushion main body 16. The extension 18 is displaced in the front-rear direction by a drive unit, thereby adjusting the length L of the seat cushion 12 in the front-rear direction.

[0027] Here, a pair of weights 28 are provided inside the extension portion 18. The pair of weights 28 are capable of relative displacement in the vertical direction with respect to the extension portion 18. In this configuration, when vehicle vibrations are transmitted to the extension portion 18, the pair of weights 28 move independently of the extension portion 18 and function like dynamic dampers. This suppresses vibration of the extension portion 18 relative to the seat cushion main body 16. In this way, the vehicle seat 10 of this embodiment can suppress the generation of abnormal noise in the seat cushion 12 due to vehicle vibrations.

[0028] Furthermore, in this embodiment, the inner surfaces of the pair of weight arrangement recesses 20A, which form spaces in which the pair of weights 28 are respectively arranged, are covered by the pair of inner-recess covering portions 22A of the buffer member 22. This configuration prevents or suppresses direct contact between the inner surfaces of the pair of weight arrangement recesses 20A and the outer surfaces of the pair of weights 28. This makes it possible to prevent or suppress the generation of abnormal noise that would otherwise be caused by direct contact between the inner surfaces of the pair of weight arrangement recesses 20A and the outer surfaces of the pair of weights 28.

[0029] In this embodiment, the pair of weights 28 are supported from below by the closing member 24. The closing member 24 is made of felt that is flexible and deformable in the vertical direction, which is its thickness direction. In this configuration, the closing member 24 can damp the vertical movement of the pair of weights 28.

[0030] In this embodiment, a pair of openings 24A are formed in the closing member 24. With this configuration, it is possible to check through the pair of openings 24A formed in the closing member 24 whether or not a pair of weights 28 have been forgotten to be placed in a pair of weight placement recesses 20A during the process of assembling the extension portion 18.

[0031] In the present embodiment, an example in which a pair of openings 24A are formed in the closing member 24 has been described, but the present invention is not limited to this. Whether or not to form the openings 24A as described above in the closing member 24 can be determined appropriately taking into consideration the assembly process of the extension portion 18, etc.

[0032] Furthermore, in the present embodiment, an example has been described in which the vertical movement of the pair of weights 28 can be damped by the closing member 24, but the present invention is not limited to this. Whether or not the vertical movement of the pair of weights 28 can be damped by the closing member 24 can be appropriately determined taking into consideration the vibration characteristics required of the extension portion 18, etc.

[0033] Although an example has been described in which the inner surfaces of a pair of weight arrangement recesses 20A, which form spaces in which the pair of weights 28 are respectively arranged, are covered by a pair of recess interior covering portions 22A of the buffer member 22, the present invention is not limited to this. In cases such as when noise caused by the pair of weights 28 contacting the inner surfaces of the pair of weight arrangement recesses 20A is extremely small, a configuration may be adopted in which the buffer members 22 are not provided. Also, a configuration may be adopted in which, in addition to the buffer members 22 described above, a buffer member covering the outer surface of the weight 28 is provided. Also, a configuration may be adopted in which, without providing the buffer members 22 described above, a buffer member covering the outer surface of the weight 28 is provided.

[0034] In addition, in the present embodiment, an example in which a pair of weights 28 are provided has been described, but the present invention is not limited to this. For example, a configuration in which a single weight 28 is provided, or a configuration in which three or more weights 28 are provided, may also be used.

[0035] The above describes one embodiment of the present invention, but the present invention is not limited to the above, and it goes without saying that it can be implemented in various other modified forms within the scope of the gist of the present invention. [Explanation of symbols]

[0036] 10 Vehicle seats 12 seat cushions 16 Seat cushion body 18 Extension 20 Extension body 20A Weight placement recess 22 Cushioning material 24 Closure member 24A aperture 28 weight

Claims

1. a seat cushion main body that constitutes a part of the seat cushion that supports the buttocks of a seated occupant from below the seat; an extension portion that configures another part of the seat cushion, is provided on a front end side of the seat cushion main body portion, and displaces in the seat front-rear direction to adjust the length of the seat cushion in the seat front-rear direction; a weight provided inside the extension portion so as to be displaceable relative to the extension portion in the up and down direction; A vehicle seat comprising:

2. 2. The vehicle seat according to claim 1, wherein at least one of an inner surface of a space in the extension where the weight is provided and an outer surface of the weight is covered with a shock-absorbing member capable of absorbing an impact.

3. the extension portion includes an extension portion main body that forms a space in which the weight is placed and has a weight placement recess that is open on the seat lower side, and a closing member that closes the open end side of the weight placement recess when attached to the seat lower side of the extension portion main body, 2. The vehicle seat according to claim 1, wherein the closing member is formed in a sheet shape using a member that is flexible and deformable in the thickness direction.

4. The vehicle seat according to claim 3, wherein the closing member is formed with an opening through which the weight stored in the weight placement recess can be seen.

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