Vehicle seats

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 forward and backward directions. [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 orientation of an occupant back and forth. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2018-127180 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned prior art, the seat back moves forward and backward relative to the seat cushion, but the orientation of the seat cushion remains unchanged. Therefore, if a submarine prevention member is provided in the seat cushion to prevent the submarine phenomenon during a vehicle collision, the submarine prevention member interferes with the occupant's buttocks when the occupant is seated facing backward, making the seat uncomfortable. Furthermore, the submarine prevention member is unable to fully prevent the submarine phenomenon for an occupant seated facing backward.

[0005] SUMMARY OF THE INVENTION In consideration of the above, an object of the present invention is to provide a vehicle seat that can provide both comfort when seated and the ability to prevent the submarine phenomenon, regardless of the orientation of the occupant when seated. [Means for solving the problem]

[0006] A first embodiment of a vehicle seat includes 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 occupant's sitting direction can be converted forward or backward by moving the position of the seat back relative to the seat cushion forward or backward, and a submarine prevention member that is provided within the seat cushion to prevent submarine phenomena in the event of a vehicle collision, is supported displaceably relative to the seat cushion, and can change its position relative to the seat cushion depending on the position of the seat back relative to the seat cushion.

[0007] In a first aspect, the back of an occupant seated on a seat cushion is supported by a seat back. A conversion mechanism connecting the seat back to the seat cushion can change the seating orientation of the occupant forward or backward by moving the position of the seat back relative to the seat cushion forward or backward. 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 can be changed in position relative to the seat cushion depending on the position of the seat back relative to the seat cushion. This makes it possible to position the submarine prevention member in an optimal position depending on the position of the seat back relative to the seat cushion, i.e., the seating orientation of the occupant. As a result, both seating comfort and submarine phenomenon prevention performance can be achieved regardless of the seating orientation of the occupant.

[0008] In a second aspect of the vehicle seat, in the first aspect, 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.

[0009] In a second aspect, a submarine prevention member provided in the seat cushion is mechanically connected to the conversion mechanism. This 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 second aspect, wherein the anti-submarining member includes a single elongated member extending in the left-right direction of the seat, and the elongated member is displaced in the front-to-rear direction of the seat in conjunction with the movement of the seat back.

[0011] In a third aspect, a single elongated member extending in the left-right direction of the seat is provided inside the seat cushion. This elongated member is mechanically connected to a conversion mechanism and is displaced in the front-rear direction of the seat relative to the seat cushion in conjunction with the forward-rear movement of the seat back relative to the seat cushion. This allows the elongated member to be positioned optimally depending on the seating orientation of the occupant.

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

[0013] In a fourth aspect, 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, are provided inside the seat cushion. These elongated members are mechanically connected to a conversion mechanism and are displaced to opposite positions in the up-down direction of the seat in conjunction with the fore-and-aft movement of the seat back relative to the seat cushion. This makes it possible to position the two elongated members in optimal positions depending on the seating orientation of the occupant.

[0014] In a fifth aspect of the vehicle seat, in the second aspect, the anti-submarining 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 a 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 a 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 allows the plate-shaped member to be positioned optimally depending on the seating orientation of the occupant. [Effects 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 explanation of the drawings]

[0017] [Figure 1] 1 is a side view showing a vehicle seat according to a first embodiment. [Figure 2] 1 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 first embodiment. [Figure 3] 1 is a side view showing a state in which the seat back is positioned at a conversion position in the vehicle seat according to the first embodiment. [Figure 4] FIG. 10 is a side view showing a vehicle seat according to a second embodiment. [Figure 5] FIG. 10 is a side view showing a state in which the seat back is in a normal position in a vehicle seat according to a second embodiment. [Figure 6] FIG. 10 is a side view showing a state in which the seat back is positioned at a conversion position in a vehicle seat according to a second embodiment. [Figure 7] FIG. 10 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 positioned in a normal position in a vehicle seat according to a third embodiment. [Figure 9] FIG. 11 is a side view showing a state in which the seat back is positioned at a conversion position in a vehicle seat according to a third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0018] First Embodiment A vehicle seat 10 according to a first embodiment of the present invention will be described with reference to Figures 1 to 3. Note that the arrows FR and UP shown in each figure indicate the forward and upward directions of the vehicle seat 10, respectively. The front-rear, left-right, top-bottom directions of the vehicle seat 10 coincide with the front-rear, left-right, top-bottom directions of the vehicle in which the vehicle seat 10 is mounted. Hereinafter, when the front-rear, left-right, top-bottom directions are used in the description, they will refer to 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 occupant's back, 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) that serves as a skeleton, a cushion pad (not shown) that is a padding material supported by the cushion frame, and a cushion skin 14 that is a skin material that covers 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) as a skeleton, a back pad (not shown) as a padding material supported by the back frame, and a back skin 18 as 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, for ease of viewing, the conversion mechanism 20 is simply illustrated as a single link. One end of the link that constitutes the conversion mechanism 20 is rotatably connected to the lower end of the seat back 16 about an axis that runs in the left-right direction. The other end of the link that constitutes the conversion mechanism 20 is rotatably connected to the center of the seat cushion 12 in the front-rear direction about an axis that runs in 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 converting the seating orientation 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 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 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 rearward 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" of the present invention and is plate-shaped. The plate 26 is disposed in the center of the seat cushion 12 in the front-rear direction with its thickness extending upward, and is embedded in the cushion pad.

[0027] A support shaft (not shown) having an axis extending in the left-right direction is provided in the center of the plate 26 in the front-rear direction. Both axial ends of this 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 support shaft is supported by the cushion frame as described above, is rotatable about an axis along the left-right direction relative to the seat cushion 12 and is displaceable between a rearward lowered position indicated by a solid line in Fig. 1 and a forward lowered position indicated by a two-dot chain line in Fig. 1. The cushion pad is shaped to allow the above-described displacement of the plate 26.

[0029] A gear 28 is coaxially fixed to one axial end (here, the left end) of the support shaft of the plate 26. 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 extending in the left-right direction relative 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 extending in the left-right direction relative 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 / backward movement of the seat back 16 relative to the seat cushion 12. This will be described in detail below.

[0030] In a normal state in which 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), causing the plate 26 to rotate 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 in which 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-down position to the rear-down position. In this way, in this embodiment, the position of the plate 26 relative to the seat cushion 12 is changed depending on 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 a 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 positioned diagonally upward and rearward relative to the plate 26, which is positioned in the rearward-downward position. In this state, the plate 26 is positioned along the buttocks B of the occupant P, preventing interference between the plate 26 and the buttocks B (see the plate 26 indicated by the two-dot chain line in FIG. 2), thereby ensuring the comfort of the occupant P. Furthermore, if the vehicle experiences a frontal collision in this state, the plate 26 restricts the forward-diagonal 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. In FIGS. 2 and 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 in the vehicle seat 10 by a seat belt (not shown). The buttocks B of the occupant P are positioned diagonally upward and forward relative to the plate 26, which is positioned in the forward-downward position. In this state, the plate 26 is positioned along the buttocks B of the occupant P, preventing interference between the plate 26 and the buttocks B (see the plate 26 indicated by the two-dot chain line in FIG. 3), thereby ensuring the comfort of the occupant P. Furthermore, if the vehicle experiences a rear-end collision in this state, the plate 26 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.

[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 rotatably supported 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 position 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 seating orientation of the occupant P. As a result, it is possible to achieve both seating comfort and submarine phenomenon prevention performance regardless of the seating 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 rotates 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 eliminates 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 rotates about an axis along the left-right direction in conjunction with the forward and backward movement of the seat back 16 relative to the seat cushion 12. This allows the plate 26 to be positioned optimally (i.e., the rearward lowered position shown by the solid line in FIG. 2 and the frontward lowered position shown by the solid line in FIG. 3) depending on the seating orientation of the occupant P, and the 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 used for 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 inside 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 axis 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 elongated with their longitudinal direction in the front-rear direction, and the pipe 42 is displaceable (slidable) relative to the seat cushion 12 between a forward position indicated by a solid line in FIG. 4 and a rearward 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 (the position indicated by the 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. As a result, the pipe 42, which is mechanically connected to the link 20, slides from the forward position to the rearward position (the position indicated by the 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 way, in this embodiment, the position of the pipe 42 relative to the seat cushion 12 is changed depending on 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 a 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 positioned diagonally upward and rearward relative to the pipe 42, which is positioned in a forward position. In this state, the pipe 42 is positioned forward and spaced apart 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 experiences 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 off 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 in the vehicle seat 10 by a seat belt (not shown). The buttocks B of the occupant P are positioned diagonally upward and forward of the pipe 42 located at the rear. In this state, the pipe 42 is positioned rearward and spaced apart 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 experiences a rear-end collision in this state, the pipe 42 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.

[0046] In this embodiment, the configuration other than that described above is the same as in 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, it is possible to achieve both seating comfort and submarine phenomenon prevention performance regardless of the seating orientation of the occupant P. Also, in this embodiment, the submarine phenomenon prevention member is composed of a single pipe 42, which simplifies the configuration of the submarine phenomenon prevention member.

[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 are provided in the seat cushion 12, instead of the plate 26 in the first embodiment, and are spaced apart from each other in the front-to-rear direction. These pipes 52, 54 constitute anti-submarining members for preventing the submarining phenomenon during a vehicle collision. These pipes 52, 54 correspond to the "long member" in this 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 portions of left and right side frames of the cushion frame of the seat cushion 12. The upper and lower slide grooves are formed elongatedly with their longitudinal direction in the up-down direction, and the pipe 52 is displaceable (slidable) relative 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 rear portions of left and right side frames of the cushion frame of the seat cushion 12. The upper and lower slide grooves are formed elongated in the vertical direction, and the pipe 54 is displaceable (slidable) relative to the seat cushion 12 between a lower position indicated by a solid line in Fig. 7 and an upper position indicated 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 and backward movement of the seat back 16 relative to the seat cushion 12.

[0051] Specifically, in the normal state where 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 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 pipes 52 and 54, which are mechanically connected to the link 20, slide in opposite directions in the up-down direction. As a result, in the conversion state where the seat back 16 is in the conversion 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 way, in this embodiment, the positions of the pipes 52, 54 relative to the seat cushion 12 are changed depending on 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 a 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 positioned diagonally upward and rearward relative to the pipe 52, which is positioned in the upper position, and positioned above the pipe 54, which is positioned in the lower position. In this state, the pipe 52 is positioned diagonally upward and forward away from the buttocks B of the occupant P, and the pipe 54 is positioned downward away from the buttocks B. This prevents interference between the pipes 52, 54 and the buttocks B, ensuring the comfort of the occupant P. Furthermore, if the vehicle experiences a frontal collision in this state, the pipe 52 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.

[0054] As shown in FIG. 9 , an occupant P seated facing backward in a 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 positioned diagonally downward and forward of the pipe 54, which is positioned in the upper position, and positioned above the pipe 52, which is positioned in the lower position. In this state, the pipe 54 is positioned diagonally upward and rearward away from the occupant P's buttocks B, and the pipe 52 is positioned downward away from the occupant P's buttocks B, preventing interference between the pipes 52, 54 and the buttocks B and ensuring the comfort of the occupant P. Furthermore, if the vehicle experiences a rear-end collision in this state, the pipe 54 restricts the rearward 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 backward from the vehicle seat 10, is prevented.

[0055] In this embodiment, the configuration other than that described above is the same as in the first embodiment. In this embodiment, as in the first embodiment, the positions of the pipes 52, 54 are changed to optimal positions depending on the position of the seat back 16 relative to the seat cushion 12. As a result, it is possible to achieve both seating comfort and submarine phenomenon prevention performance regardless of the seating orientation of the occupant P. Also, in this embodiment, the submarine phenomenon prevention member is composed of two pipes 52, 54 arranged at a distance from each other in the front and rear, so there is no need 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 embodiments, the plate 26 and pipes 52, 52, 54 serving as the anti-submarine member are mechanically connected to the link 20 serving as the conversion mechanism, and are displaced relative to the seat cushion 12 in conjunction with the movement of the seat back 16. However, this is not a limitation. The anti-submarine member 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. In other words, the anti-submarine member and the seat back may each move (displace) separately. The anti-submarine member 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 anti-submarine member relative to the seat cushion is changed by an actuator.

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

[0058] 10 Vehicle seats 12 seat cushions 16 Seat back 20 Link (conversion mechanism) 26 Plate (plate-shaped member; anti-submarine member) 40 Vehicle seats 42 Pipe (long member; anti-submarine member) 50 Vehicle seats 52 Pipe (long member; anti-submarine member) 54 Pipe (long member; anti-submarine member) 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 the seating orientation of the occupant can be converted forward or backward by moving the 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, supported displaceably with respect to the seat cushion, and capable of changing its position with respect to the seat cushion depending on 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-submarining member includes a single elongated member extending in the left-right direction of the seat, and the elongated member is displaced in the 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-submarining 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 each other in the up-down direction of the seat in conjunction with the movement of the seat back.

5. 3. The vehicle seat according to claim 2, wherein the anti-submarining member includes a plate-shaped member arranged with its thickness 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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