Vehicle seat

Abstract

To provide a vehicle seat which can achieve both of comfortability during seating and submarine phenomenon prevention performance regardless of seating direction of an occupant.SOLUTION: A vehicle seat 10 comprises: a seat cushion 12 on which an occupant sits; a seatback 16 which supports a back part of the occupant; a conversion mechanism 20 connecting the seatback to the seat cushion such that moving the position of the seatback 16 in the front-back direction relative to the seat cushion 12 is converted to a seating direction of the occupant in a front-back direction; and a plate 26 which is arranged in the seat cushion 12 to prevent submarine phenomenon at the time of vehicle collision, is supported so as to be displaceable relative to the seat cushion 12, and can be displaced relative to the seat cushion 12 according to the position of the seatback 16 relative to the seat cushion 12.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a vehicle seat in which the seating direction of an occupant can be changed between front and rear. [Background technology]

[0002] The vehicle seat device disclosed in Patent Document 1 below includes a conversion mechanism that moves a seat back forward and backward relative to a seat cushion, thereby converting the seating direction of an occupant between front and rear. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-127180 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned prior art, the seat back is moved forward and backward with respect to the seat cushion, but the forward and backward orientation of the seat cushion is not changed. Therefore, when a submarine prevention member for preventing the submarine phenomenon in the event of a vehicle collision is provided in the seat cushion, when the occupant is seated facing backward, the submarine prevention member interferes with the occupant's buttocks, making the seating comfortable. In addition, the submarine prevention member cannot fully exert its effect of preventing the submarine phenomenon for an occupant seated facing backward.

[0005] SUMMARY OF THE PRESENT EMBODIMENT In consideration of the above, an object of the present invention is to provide a vehicle seat that is both comfortable to sit in and has the ability to prevent the submarine phenomenon, regardless of the orientation of the occupant when sitting. [Means for solving the problem]

[0006] The vehicle seat of the first embodiment comprises a seat cushion on which an occupant sits, a seat back that supports the back of the occupant, a conversion mechanism that connects the seat back to the seat cushion so that the seating direction of the occupant can be converted from front to back by moving the position of the seat back relative to the seat cushion back and forth, and a submarine prevention member that is provided within the seat cushion to prevent the submarine phenomenon in the event of a vehicle collision, is supported displaceably relative to the seat cushion, and has a position relative to the seat cushion that can be changed depending on the position of the seat back relative to the seat cushion.

[0007] In the first aspect, the back of an occupant seated on the seat cushion is supported by the seat back. A conversion mechanism that connects the seat back to the seat cushion can change the seating orientation of the occupant back and forth by moving the position of the seat back relative to the seat cushion back and forth. The seat cushion is provided with a submarine prevention member to prevent the submarine phenomenon in the event of a vehicle collision. The submarine prevention member is supported displaceably relative to the seat cushion, and its position relative to the seat cushion can be changed according to the position of the seat back relative to the seat cushion. This makes it possible to position the submarine prevention member at an optimal position according to the position of the seat back relative to the seat cushion, i.e., the seating orientation of the occupant. As a result, it is possible to achieve both seating comfort and submarine phenomenon prevention performance regardless of the seating orientation of the occupant.

[0008] In a second aspect of the vehicle seat, in the first aspect, the anti-submarine member is mechanically connected to the conversion mechanism and is displaced relative to the seat cushion in conjunction with the movement of the seat back.

[0009] In the second aspect, a submarine prevention member provided in the seat cushion is mechanically connected to the conversion mechanism. The submarine prevention member is displaced relative to the seat cushion in conjunction with the forward and backward movement of the seat back relative to the seat cushion. This eliminates the need to change the position of the submarine prevention member relative to the seat cushion.

[0010] A third aspect of the vehicle seat is the same as the second aspect, in which the anti-submarine member includes a single elongated member extending in the left-right direction of the seat, and the elongated member is displaced in the fore-and-aft direction of the seat in conjunction with the movement of the seat back.

[0011] In the third aspect, a single long member extending in the left-right direction of the seat is provided inside the seat cushion. This long member is mechanically connected to the conversion mechanism and displaced in the front-rear direction of the seat relative to the seat cushion in conjunction with the front-rear movement of the seat back relative to the seat cushion. This makes it possible to position the long member at an optimal position depending on the seating orientation of the occupant.

[0012] A fourth aspect of the vehicle seat is that of the second aspect, wherein the anti-submarine member includes two long members each extending in the left-right direction of the seat and spaced apart from each other in the fore-aft direction of the seat, and the two long members are displaced to opposite sides of the seat in the up-down direction in conjunction with the movement of the seat back.

[0013] In a fourth aspect, two long members each extending in the left-right direction of the seat and spaced apart from each other in the front-rear direction of the seat are provided in the seat cushion. These long members are mechanically connected to a conversion mechanism and are displaced to opposite sides in the up-down direction of the seat in conjunction with the front-rear movement of the seat back relative to the seat cushion. This makes it possible to position the two long members in optimal positions according to the seating orientation of the occupant.

[0014] In the vehicle seat of the fifth aspect, in the second aspect, the anti-submarine member includes a plate-shaped member arranged with its thickness direction aligned in the vertical direction of the seat, and the plate-shaped member rotates around an axis aligned in the left-right direction of the seat in conjunction with the movement of the seat back.

[0015] In the fifth aspect, a plate-shaped member is provided in the seat cushion with its thickness aligned along the vertical direction of the seat. This plate-shaped member is mechanically connected to the conversion mechanism and rotates about an axis along the left-right direction of the seat in conjunction with the forward and backward movement of the seat back relative to the seat cushion. This makes it possible to position the plate-shaped member in an optimal position according to the seating orientation of the occupant. Effect of the Invention

[0016] As described above, according to the present invention, it is possible to achieve both seating comfort and submarine phenomenon prevention performance regardless of the seating orientation of the occupant. [Brief description of the drawings]

[0017] [Figure 1] FIG. 1 is a side view showing a vehicle seat according to a first embodiment. [Diagram 2] 1 is a side view showing a state in which a seat back is located in a normal position in a vehicle seat according to a first embodiment. [Diagram 3] 1 is a side view showing a state in which the seat back is located at a conversion position in the vehicle seat according to the first embodiment. FIG. [Figure 4] FIG. 11 is a side view showing a vehicle seat according to a second embodiment. [Diagram 5] FIG. 11 is a side view showing a state in which the seat back is located in a normal position in the vehicle seat according to the second embodiment. [Figure 6] FIG. 11 is a side view showing a state in which the seat back is located at a conversion position in the vehicle seat according to the second embodiment. [Figure 7] FIG. 11 is a side view showing a vehicle seat according to a third embodiment. [Figure 8]FIG. 11 is a side view showing a state in which the seat back is located in a normal position in the vehicle seat according to the third embodiment. [Figure 9] FIG. 11 is a side view showing a state in which the seat back is located at a conversion position in a vehicle seat relating to a third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] <First embodiment> A vehicle seat 10 according to a first embodiment of the present invention will be described with reference to Figs. 1 to 3. Note that the arrows FR and UP shown in each drawing indicate the front and upward directions of the vehicle seat 10, respectively. The front-rear, left-right, top-bottom directions of the vehicle seat 10 match the front-rear, left-right, top-bottom directions of the vehicle in which the vehicle seat 10 is mounted. In the following description, when the front-rear, left-right, top-bottom directions are used simply, they will indicate directions relative to the vehicle seat 10, unless otherwise specified.

[0019] (composition) As shown in FIG. 1, a vehicle seat 10 includes a seat cushion 12 on which an occupant sits, a seat back 16 that supports the back of the occupant, a conversion mechanism 20 that connects the seat back 16 to the seat cushion 12, and a plate 26 provided within the seat cushion 12.

[0020] The seat cushion 12 includes a cushion frame (not shown) which is a skeleton, a cushion pad (not shown) which is a padding material supported by the cushion frame, and a cushion skin 14 which is a skin material covering the surface of the cushion pad. The seat cushion 12 is connected to the floor of the vehicle body (all not shown) via, for example, a well-known slide rail mechanism.

[0021] The seat back 16 includes a back frame (not shown) which is a skeleton, a back pad (not shown) which is a padding material supported by the back frame, and a back skin 18 which is a skin material covering the surface of the back pad. The lower end of the seat back 16 is connected to the seat cushion 12 via a conversion mechanism 20.

[0022] The conversion mechanism 20 is composed of parallel links, but in FIG. 1, in order to make the drawing easier to see, the conversion mechanism 20 is simply illustrated as a single link. One end of the link constituting the conversion mechanism 20 is rotatably connected to the lower end of the seat back 16 about an axis along the left-right direction. The other end of the link constituting the conversion mechanism 20 is rotatably connected to the center of the seat cushion 12 in the front-rear direction about an axis along the left-right direction. Hereinafter, the conversion mechanism 20 will be referred to as "link 20."

[0023] The link 20 connects the seat back 16 to the seat cushion 12 so that the seat back 16 can move back and forth between a normal position shown by a solid line in Fig. 1 and a converted position shown by a two-dot chain line in Fig. 1 (see arrow C in Fig. 1). The conversion mechanism 20 moves the position of the seat back 16 back and forth relative to the seat cushion 12, thereby making it possible to convert the seating direction of the occupant back and forth.

[0024] Specifically, when the seat back 16 is in the normal position (hereinafter referred to as the "normal state"), the lower end of the seat back 16 contacts from the front side with a rear stopper 22 provided at the rear end of the seat cushion 12, and the seat back 16 is in a position in which it extends upward from the rear end of the seat cushion 12. In this normal state, as shown in FIG. 2, the back of the occupant P seated facing forward on the seat cushion 12 is supported by the seat back 16.

[0025] When the seat back 16 is in the converted position (hereinafter referred to as the "converted state"), the lower end of the seat back 16 contacts from the rear side with a front stopper 24 provided at the front end of the seat cushion 12, and the seat back 16 is in a position in which it extends upward from the front end of the seat cushion 12. In this converted state, as shown in FIG. 3, the back of the occupant P seated facing backward relative to the seat cushion 12 is supported by the seat back 16.

[0026] The plate 26 provided in the seat cushion 12 constitutes a submarine prevention member for preventing the submarine phenomenon during a vehicle collision. The plate 26 corresponds to the "plate-like member" in the present invention and is plate-shaped. The plate 26 is disposed in the center in the front-rear direction in the seat cushion 12 with its plate thickness extending upward, and is embedded in the cushion pad.

[0027] A support shaft (not shown) having an axial direction in the left-right direction is provided in the center of the plate 26 in the front-rear direction. Both axial ends of the support shaft are rotatably supported by left and right side frames of the cushion frame of the seat cushion 12. The left and right side frames extend in the front-rear direction on the left and right sides of the seat cushion 12.

[0028] The plate 26, whose shaft is supported by the cushion frame as described above, is rotatable about an axis along the left-right direction with respect to the seat cushion 12 and is displaceable between a rear lowered position shown by a solid line in Fig. 1 and a front lowered position shown by a two-dot chain line in Fig. 1. The cushion pad is shaped to allow the above-mentioned displacement of the plate 26.

[0029] A gear 28 is coaxially fixed to one end (here, the left end) of the support shaft of the plate 26 in the axial direction. The gear 28 is meshed with an intermediate gear 30, which is meshed with a link gear 32. The intermediate gear 30 is supported rotatably about an axis along the left-right direction with respect to the cushion frame. The link gear 32 is fixed to the other end of the link 20, and is supported rotatably about an axis along the left-right direction with respect to the cushion frame. As a result, the plate 26 is mechanically connected to the link 20 via the gear 28, the intermediate gear 30, and the link gear 32. The plate 26 is configured to be displaced (here, rotated) relative to the seat cushion 12 in conjunction with the forward and backward movement of the seat back 16 relative to the seat cushion 12. A specific description will be given below.

[0030] In a normal state where the seat back 16 is in the normal position, the plate 26 is disposed in a rear-down position (position indicated by a solid line in FIG. 1). When the seat back 16 is moved from the normal position to the conversion position, one end of the link 20 rotates relative to the seat back 16, and the other end of the link 20 rotates relative to the seat cushion 12. As a result, the link gear 32 fixed to the other end of the link 20 rotates (see arrow R1 in FIG. 1), and the intermediate gear 30 and the gear 28 rotate (see arrows R2 and R3 in FIG. 1), and the plate 26 is rotated from the rear-down position to the front-down position (position indicated by a two-dot chain line in FIG. 1) (see arrows U and D in FIG. 1). As a result, in a conversion state where the seat back 16 is in the conversion position, the plate 26 is disposed in the front-down position.

[0031] When the seat back 16 is moved from the converted position to the normal position, one end of the link 20 rotates relative to the seat back 16, and the other end of the link 20 rotates relative to the seat cushion 12. As a result, the link gear 32 fixed to the other end of the link 20 rotates, and the intermediate gear 30 and the gear 28 rotate, causing the plate 26 to rotate from the front lowered position to the rear lowered position. In this manner, in this embodiment, the position of the plate 26 relative to the seat cushion 12 is changed according to the position of the seat back 16 relative to the seat cushion 12.

[0032] As shown in FIG. 2, an occupant P seated facing forward in the vehicle seat 10 in a normal state is restrained to the vehicle seat 10 by a seat belt (not shown). The buttocks B of the occupant P are disposed obliquely upward and rearward with respect to the plate 26 positioned in the rearward lowered position. In this state, the plate 26 is disposed along the buttocks B of the occupant P, thereby preventing interference between the plate 26 and the buttocks B (see the plate 26 indicated by the two-dot chain line in FIG. 2), and ensuring the comfort of the occupant P. Also, if the vehicle collides head-on in this state, the plate 26 restricts the movement of the buttocks B obliquely forward and downward. As a result, the submarine phenomenon in which the occupant P slips out of the seat belt and slides forward from the vehicle seat 10 is prevented. In FIG. 2 and FIG. 3, PE denotes the pelvis of the occupant P.

[0033] As shown in FIG. 3, an occupant P seated facing backward in the vehicle seat 10 in the converted state is restrained to the vehicle seat 10 by a seat belt (not shown). The buttocks B of the occupant P are disposed obliquely upward and forward with respect to the plate 26 that is positioned in the forward lowered position. In this state, the plate 26 is disposed along the buttocks B of the occupant P, thereby preventing interference between the plate 26 and the buttocks B (see the plate 26 indicated by the two-dot chain line in FIG. 3), and ensuring the comfort of the occupant P. Furthermore, if the vehicle collides from behind in this state, the plate 26 restricts the movement of the buttocks B obliquely downward and backward. As a result, the submarine phenomenon in which the occupant P slips out of the seat belt and slides backward from the vehicle seat 10 is prevented.

[0034] Next, the operation and effects of this embodiment will be described. In the vehicle seat 10 configured as described above, the back of the occupant P seated on the seat cushion 12 is supported by the seat back 16. A link 20 connecting the seat back 16 to the seat cushion 12 moves the position of the seat back 16 forward or backward relative to the seat cushion 12, thereby enabling the seating orientation of the occupant P to be changed forward or backward. The seat cushion 12 is provided with a plate 26 to prevent the submarine phenomenon in the event of a vehicle collision.

[0035] The plate 26 is supported rotatably with respect to the seat cushion 12, and its position with respect to the seat cushion 12 can be changed according to the position of the seat back 16 with respect to the seat cushion 12. This makes it possible to place the plate 26 in an optimal position according to the position of the seat back 16 with respect to the seat cushion 12, i.e., the seated orientation of the occupant P. As a result, it is possible to achieve both seated comfort and submarine phenomenon prevention performance regardless of the seated orientation of the occupant P.

[0036] In addition, in this vehicle seat 10, a plate 26 provided in the seat cushion 12 is mechanically connected to the link 20. This plate 26 is rotated relative to the seat cushion 12 in conjunction with the forward and backward movement of the seat back 16 relative to the seat cushion 12. This makes it possible to eliminate the need to change the position of the plate 26 relative to the seat cushion 12.

[0037] Furthermore, in this vehicle seat 10, the plate 26 is rotated about an axis along the left-right direction in conjunction with the front-rear movement of the seat back 16 relative to the seat cushion 12. This allows the plate 26 to be located in an optimal position (i.e., the rear lowered position shown by the solid line in Fig. 2 and the front lowered position shown by the solid line in Fig. 3) according to the seating orientation of the occupant P, and the amount of displacement of the plate 26 can be set small.

[0038] Next, another embodiment of the present invention will be described. Note that the same reference numerals as in the first embodiment are given to the configurations and operations that are basically the same as those in the first embodiment, and the description thereof will be omitted.

[0039] <Second embodiment> 4 shows a side view of a vehicle seat 40 according to a second embodiment of the present invention. In this vehicle seat 40, a single pipe 42 is provided in the seat cushion 12 instead of the plate 26 in the first embodiment. This pipe 42 constitutes a submarine prevention member for preventing the submarine phenomenon during a vehicle collision. This pipe 42 corresponds to the "long member" in the present invention and is cylindrical.

[0040] The pipe 42 is disposed with its axial direction in the left-right direction and extends in the left-right direction. Both axial ends of the pipe 42 are inserted into left and right slide grooves (not shown) formed in left and right side frames of the cushion frame of the seat cushion 12. The left and right slide grooves are formed in elongated shapes with their longitudinal direction extending in the front-rear direction, and the pipe 42 is displaceable (slidable) relative to the seat cushion 12 between a front position indicated by a solid line in Fig. 4 and a rear position indicated by a two-dot chain line in Fig. 4 (see arrow S in Fig. 4). The cushion pad of the seat cushion 12 is shaped to allow the pipe 42 to slide.

[0041] The pipe 42 is mechanically connected to the link 20 via a connecting mechanism (not shown). An example of this connecting mechanism is a link mechanism. The pipe 42 mechanically connected to the link 20 is configured to slide (displace) in the front-rear direction in conjunction with the front-rear movement of the seat back 16 relative to the seat cushion 12.

[0042] Specifically, in a normal state where the seat back 16 is in the normal position, the pipe 42 is disposed in a forward position (position indicated by a solid line in FIG. 4). When the seat back 16 is moved from the normal position to the converted position, one end of the link 20 rotates relative to the seat back 16, and the other end of the link 20 rotates relative to the seat cushion 12. This causes the pipe 42 mechanically connected to the link 20 to slide from the forward position to the rearward position (position indicated by a two-dot chain line in FIG. 4). As a result, in a converted state where the seat back 16 is in the converted position, the pipe 42 is disposed in the rearward position.

[0043] When the seat back 16 is moved from the converted position to the normal position, one end of the link 20 rotates relative to the seat back 16, and the other end of the link 20 rotates relative to the seat cushion 12. This causes the pipe 42 mechanically connected to the link 20 to slide from the rear position to the front position. In this manner, in this embodiment, the position of the pipe 42 relative to the seat cushion 12 is changed according to the position of the seat back 16 relative to the seat cushion 12.

[0044] As shown in FIG. 5, an occupant P seated facing forward in the vehicle seat 10 in a normal state is restrained in the vehicle seat 10 by a seat belt (not shown). The buttocks B of the occupant P are disposed obliquely upward and rearward from the pipe 42 located in the forward position. In this state, the pipe 42 is disposed forward and spaced from the buttocks B of the occupant P, thereby preventing interference between the pipe 42 and the buttocks B and ensuring the comfort of the occupant P. Furthermore, if the vehicle suffers a frontal collision in this state, the pipe 42 restricts the forward and downward movement of the buttocks B. As a result, the submarine phenomenon in which the occupant P slips out of the seat belt and slides forward from the vehicle seat 10 is prevented.

[0045] As shown in FIG. 6, an occupant P seated facing backward in the vehicle seat 10 in the converted state is restrained to the vehicle seat 10 by a seat belt (not shown). The buttocks B of the occupant P are disposed diagonally upward and forward from the pipe 42 located at the rear. In this state, the pipe 42 is disposed rearward and spaced away from the buttocks B of the occupant P, thereby preventing interference between the pipe 42 and the buttocks B and ensuring the comfort of the occupant P. Furthermore, if the vehicle collides from behind in this state, the pipe 42 restricts the movement of the buttocks B diagonally downward and backward. As a result, the submarine phenomenon in which the occupant P slips out of the seat belt and slides backward from the vehicle seat 10 is prevented.

[0046] In this embodiment, the configuration other than the above is the same as that of the first embodiment. In this embodiment, as in the first embodiment, the position of the pipe 42 is changed to an optimal position depending on the position of the seat back 16 relative to the seat cushion 12. As a result, regardless of the seating orientation of the occupant P, it is possible to achieve both comfort when seated and submarine phenomenon prevention performance. Also, in this embodiment, since the submarine prevention member is composed of a single pipe 42, the configuration of the submarine prevention member can be simplified.

[0047] <Third embodiment> 7 shows a side view of a vehicle seat 50 according to a third embodiment of the present invention. In this vehicle seat 40, two pipes 52, 54 arranged spaced apart from each other in the front-rear direction are provided in the seat cushion 12, instead of the plate 26 in the first embodiment. These pipes 52, 54 constitute a submarine prevention member for preventing the submarine phenomenon at the time of a vehicle collision. These pipes 52, 54 correspond to the "long member" in the present invention and are cylindrical.

[0048] One pipe 52 is disposed in front of the seat cushion 12 with its axis in the left-right direction and extends in the left-right direction. The other pipe 54 is disposed in the rear of the seat cushion 12 with its axis in the left-right direction and extends in the left-right direction. Both axial ends of the pipe 52 are inserted into upper and lower slide grooves (not shown) formed in the front parts of the left and right side frames of the cushion frame of the seat cushion 12. The upper and lower slide grooves are formed in elongated shapes with their longitudinal direction in the up-down direction, and the pipe 52 is displaceable (slidable) with respect to the seat cushion 12 between an upper position indicated by a solid line in FIG. 7 and a lower position indicated by a two-dot chain line in FIG. 7 (see arrow L1 in FIG. 7).

[0049] Both axial ends of the pipe 54 are inserted into upper and lower slide grooves (not shown) formed in the rear parts of the left and right side frames of the cushion frame of the seat cushion 12. The upper and lower slide grooves are formed in an elongated shape with the vertical direction as the longitudinal direction, and the pipe 54 is displaceable (slidable) relative to the seat cushion 12 between a lower position shown by a solid line in Fig. 7 and an upper position shown by a two-dot chain line in Fig. 7 (see arrow L2 in Fig. 7). The cushion pad of the seat cushion 12 is shaped to allow the pipes 52, 54 to slide.

[0050] The pipes 52, 54 are mechanically connected to the link 20 (not shown in Figs. 7 to 9) via a connecting mechanism (not shown). An example of this connecting mechanism is a link mechanism. The pipes 52, 54 mechanically connected to the link 20 are configured to slide (displace) in opposite directions in the up-down direction in conjunction with the forward / backward movement of the seat back 16 relative to the seat cushion 12.

[0051] Specifically, in a normal state in which the seat back 16 is in the normal position, the pipe 52 is disposed in an upper position, and the pipe 54 is disposed in a lower position. When the seat back 16 is moved from the normal position to the converted position, one end of the link 20 rotates relative to the seat back 16, and the other end of the link 20 rotates relative to the seat cushion 12. As a result, the pipes 52 and 54 mechanically connected to the link 20 slide in opposite directions in the up-down direction. As a result, in a converted state in which the seat back 16 is in the converted position, the pipe 52 is disposed in a lower position, and the pipe 54 is disposed in an upper position.

[0052] When the seat back 16 is moved from the converted position to the normal position, one end of the link 20 rotates relative to the seat back 16, and the other end of the link 20 rotates relative to the seat cushion 12. As a result, the pipes 52, 54 mechanically connected to the link 20 slide in opposite directions in the up-down direction. In this manner, in this embodiment, the positions of the pipes 52, 54 relative to the seat cushion 12 are changed according to the position of the seat back 16 relative to the seat cushion 12.

[0053] As shown in FIG. 8, an occupant P seated facing forward in the vehicle seat 10 in a normal state is restrained to the vehicle seat 10 by a seat belt (not shown). The buttocks B of the occupant P are disposed obliquely upward and rearward from the pipe 52 located at the upper position, and disposed above the pipe 54 located at the lower position. In this state, the pipe 52 is disposed obliquely upward and forward from the buttocks B of the occupant P, and the pipe 54 is disposed at a distance downward, thereby preventing interference between the pipes 52, 54 and the buttocks B, and ensuring the comfort of the occupant P. In addition, if the vehicle collides head-on in this state, the pipe 52 restricts the movement of the buttocks B obliquely downward and forward. As a result, the submarine phenomenon in which the occupant P slips out of the seat belt and slides forward from the vehicle seat 10 is prevented.

[0054] As shown in FIG. 9, an occupant P seated facing backward in the vehicle seat 10 in a normal state is restrained to the vehicle seat 10 by a seat belt (not shown). The buttocks B of the occupant P are disposed diagonally downward and forward of the pipe 54 located at the upper position, and disposed above the pipe 52 located at the lower position. In this state, the pipe 54 is disposed diagonally upward and rearward away from the buttocks B of the occupant P, and the pipe 52 is disposed at a distance downward, thereby preventing interference between the pipes 52, 54 and the buttocks B, and ensuring the comfort of the occupant P. In addition, if the vehicle collides from behind in this state, the pipe 54 restricts the movement of the buttocks B diagonally downward and rearward. As a result, the submarine phenomenon in which the occupant P slips out of the seat belt and slides backward from the vehicle seat 10 is prevented.

[0055] In this embodiment, the configuration other than the above is the same as in the first embodiment. In this embodiment, the positions of the pipes 52, 54 are changed to the optimum positions according to the position of the seat back 16 relative to the seat cushion 12, as in the first embodiment. As a result, it is possible to achieve both comfort when seated and submarine phenomenon prevention performance regardless of the seating orientation of the occupant P. Also, in this embodiment, since the submarine phenomenon prevention member is composed of two pipes 52, 54 arranged at a distance in the front and rear, it is not necessary to displace each of the pipes 52, 54 in the front and rear, and the amount of displacement of each of the pipes 52, 54 can be set small.

[0056] In the above-described embodiments, the plate 26 and the pipes 52, 52, 54, which are the submarine prevention members, are mechanically connected to the link 20, which is the conversion mechanism, and are displaced relative to the seat cushion 12 in conjunction with the movement of the seat back 16, but the present invention is not limited to this. The submarine prevention members may not be mechanically connected to the conversion mechanism and may not be displaced relative to the seat cushion in conjunction with the movement of the seat back, that is, the submarine prevention members and the seat back may be moved (displaced) separately. The submarine prevention members and the conversion mechanism may also be electrically connected. In this case, for example, when the position of the seat back relative to the seat cushion is moved forward or backward, the position of the seat back is detected by a sensor, and the position of the submarine prevention members relative to the seat cushion is changed by an actuator.

[0057] In addition, the present invention can be practiced with various modifications without departing from the spirit and scope of the present invention. Furthermore, the scope of the present invention is not limited to the above-described embodiments. [Explanation of symbols]

[0058] 10 Vehicle seats 12 Seat cushion 16 Seat back 20 Link (conversion mechanism) 26 Plate (plate-shaped component; anti-submarine component) 40 Vehicle seats 42 Pipes (long components; anti-submarine components) 50 Vehicle seats 52 Pipes (long components; anti-submarine components) 54 Pipes (long components; anti-submarine components) P Crew

Claims

1. A seat cushion on which an occupant sits; A seat back that supports the back of the occupant; a conversion mechanism that connects the seat back to the seat cushion so that a seating orientation of the occupant can be converted forward or backward by moving a position of the seat back relative to the seat cushion forward or backward; a submarine prevention member provided within the seat cushion for preventing a submarine phenomenon in the event of a vehicle collision, the submarine prevention member being supported displaceably with respect to the seat cushion, and the position of the submarine prevention member being changeable with respect to the seat cushion in accordance with the position of the seat back with respect to the seat cushion; A vehicle seat comprising:

2. 2. The vehicle seat according to claim 1, wherein the anti-submarining member is mechanically connected to the conversion mechanism and is displaced relative to the seat cushion in conjunction with the movement of the seat back.

3. 3. The vehicle seat according to claim 2, wherein the anti-submarine member includes a single long member extending in a left-right direction of the seat, and the long member is displaced in a front-rear direction of the seat in conjunction with the movement of the seat back.

4. 3. The vehicle seat according to claim 2, wherein the anti-submarine member includes two elongated members each extending in the left-right direction of the seat and spaced apart from each other in the front-rear direction of the seat, and the two elongated members are displaced to opposite sides of the seat in the up-down direction in conjunction with the movement of the seat back.

5. 3. The vehicle seat according to claim 2, wherein the anti-submarine member includes a plate-shaped member arranged with its thickness direction aligned in the vertical direction of the seat, and the plate-shaped member rotates about an axis aligned in the left-right direction of the seat in conjunction with the movement of the seat back.

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