JP2008062877A - Seat for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely function a false displacement lock mechanism by restraining the movement of a seat body in a seat for a vehicle enabling the easy getting on/off the vehicle by rotating the seat body to move to the outside of a cabin and having the false displacement lock mechanism for receiving a large seat belt load added to the seat body due to the head-on collision of the vehicle by a vehicle floor side. <P>SOLUTION: When a seat body 10 is returned to a sitting position, an auxiliary lever 111 is raised, and the forward horizontal movement of the seat body 10 is restrained, and the rear part thereof is guided to the forward diagonal upward when a seat belt load is added to the seat body. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention is capable of rotating the seat body between a seating position facing forward of the vehicle and a lateral position facing the door opening, and lowering the seat body outside the passenger compartment at the lateral position facing the door opening. It is related with the vehicle seat so that boarding / alighting can be performed easily.

A technique related to this type of vehicle seat is disclosed in Patent Document 1, for example. As shown in FIG. 12, the vehicle seat 1 includes a seat body 10 and a front / rear slide mechanism 20 that moves the seat body 10 in the vehicle front-rear direction with respect to the vehicle floor F. On the slide base 21 of the front / rear slide mechanism 20, there is installed a rotation mechanism 30 that rotates the seat body 10 between a seating position facing the vehicle forward (position shown in FIG. 12) and a lateral position facing the door opening D side. Has been. On the rotation base 35 of the rotation mechanism 30, a first slide mechanism 40 that moves the seat body 10 in the lateral position forward or backward through the door opening D and out of the passenger compartment, and the seat body 10 by the first slide mechanism 40. An elevating mechanism 50 that lowers and raises the seat body 10 as it moves forward and backward is placed. Further, a second slide mechanism 60 that horizontally moves the seat body 10 is installed on the lift base 55 that is lifted and lowered by the lift mechanism 50.
The second slide mechanism 60 mainly includes a screw shaft mechanism including a screw shaft having a so-called trapezoidal screw and a nut meshing with the screw shaft. By moving the nut in the screw shaft direction by rotation of the screw shaft, the seat body 10 is provided. Is configured to move with respect to the lifting base 55. For this reason, unless the screw shaft is positively rotated by the electric motor, the seat body 10 is locked in a state where it cannot be moved with respect to the lifting base 55 (self-locking function).

On the other hand, the vehicle seat 1 prevents the seat body 10 from being displaced in an incorrect direction due to the seat belt load when a large seat belt load is applied to the seat body 10 at the time of a frontal collision of the vehicle. An unauthorized displacement locking mechanism R, Z is provided. The upper unauthorized displacement locking mechanism R includes a hook 90 provided at the rear portion of the seat body 10 and an engagement bracket 80 attached to the rotation base 35. The hook 90 is inserted into the engagement bracket 80 from the front in the process in which the seat body 10 is returned to the retracted position by the second slide mechanism 60. For this reason, depending on the operation of the second slide mechanism 60 due to the positive rotation of the screw shaft, the hook 90 is not engaged with the engagement bracket 80, and accordingly, the horizontal movement operation of the seat body 10 by the second slide mechanism 60 is hindered. There is no state (during normal operation).
On the other hand, for example, when a large seat belt load is applied to the seat body 10 at the time of a frontal collision of the vehicle, the screw shaft is not positively rotated in the second slide mechanism 60, so that the seat body 10 moves horizontally. Is locked, the seat belt load acts as a large external force in the direction in which the rear portion of the seat body 10 floats upward (the direction indicated by the white arrow in FIG. 12). In this case, the hook 90 is displaced obliquely upward and engages with the engagement bracket 80, whereby an external force in a direction in which the rear portion of the seat body 10 is displaced upward is strongly received and the seat body 10 is illegally operated. Displacement in any direction (the movement is caused by the seat belt load, in this case, displacement in the turning direction before the rear part is displaced upward) can be prevented.

The lower unauthorized displacement locking mechanism Z is a hooking bracket 95 that is attached to the side of the rotary base 35 so as to protrude downward from substantially the same position as the engaging bracket 80, and the hooking bracket 95. And a receiving bracket 85 fixed on the vehicle floor F along the vehicle longitudinal direction. A hooking portion 95a bent in an L shape is provided on the lower end side of the hooking bracket 95 on the rotating base 35 side. On the other hand, the upper portion of the receiving bracket 85 on the vehicle floor F side is bent in an L shape to be provided with a receiving portion 85a. The hooking portion 95a enters the lower side of the receiving portion 85a. According to the lower side improper displacement locking mechanism Z, when the seat body 10 is moved in the vehicle front-rear direction by the operation of the front-rear slide mechanism 20 in a position facing the front of the vehicle, the hook bracket 95 The hooking portion 95a and the receiving portion 85a of the receiving bracket 85 are spaced apart from each other and do not interfere with each other, and therefore, the seat body 10 is allowed to slide in the vehicle front-rear direction.
On the other hand, as described above, a large seat belt load is applied to the seat body 10 and the hook 90 is engaged with the engagement bracket 80 in the upper improper displacement locking mechanism R. When an external force is applied in the direction of displacement, the hooking portion 95a of the hooking bracket 95 is engaged with the receiving portion 85a of the receiving bracket 85 from below, whereby the hooking bracket 95 and the receiving bracket 85 are engaged. Then, the rotary base 35 is coupled to the vehicle floor F for upward displacement, and as a result, the seat belt load is firmly received on the vehicle floor F side.
As described above, in the conventional vehicle seat, the large seat belt load applied to the seat body 10 is directly received on the vehicle floor F side via the upper and lower unauthorized displacement locking mechanisms R and Z, whereby the incorrect direction of the seat body 10 is obtained. The displacement to the can be regulated.
JP-A-2005-14672

However, when the rack and pinion mechanism is used instead of the conventional screw shaft mechanism for the second slide mechanism 60 in order to reduce the height of the vehicle seat in the height direction, the mechanism is like a screw shaft mechanism. Since there is no self-locking function for the horizontal movement of the seat main body 10, when a large seat belt load is applied to the seat main body 10, the seat main body 10 moves horizontally and the hook 90 moves from the engagement bracket 80. As a result, the hook 90 may not be engaged with the engagement bracket 80. If the hook 90 comes out of the engaging bracket 80 and the upper unauthorized displacement locking mechanism R does not function, the lower unauthorized displacement locking mechanism Z also does not function (the hooking portion 95a of the hooking bracket 95 is received by the receiving bracket 85). As a result, since the seat belt load cannot be received on the vehicle floor F side, the displacement of the seat body 10 in an unauthorized direction may not be regulated.
The present invention has been made to solve this problem. For example, a rack and pinion mechanism that cannot expect a self-locking function with respect to the second slide mechanism that horizontally moves the seat body with respect to the lifting base is used. Even if it exists, it aims at functioning an unauthorized displacement locking mechanism reliably, and preventing the displacement to the unauthorized direction of the said seat main body by a seatbelt load reliably.

For this reason, the present invention provides a vehicle seat having the structure described in the claims.
According to the vehicle seat of claim 1, a large seat belt load is applied obliquely forward and upward with respect to the seat body due to a vehicle frontal collision or the like when the seat body is seated in the front direction of the vehicle, for example, in a vehicle running state. In this case, since the horizontal movement of the seat body to the front is restricted by the lock assist mechanism and the rear portion thereof is guided obliquely upward and forward, the improper displacement lock mechanism can function reliably and receive the seat belt load. Accordingly, it is possible to reliably prevent unauthorized displacement in the turning direction in front of the sheet main body.
In this way, when the seat belt load is applied to the seat body, the horizontal movement forward of the seat body is restricted by the lock assist mechanism, so the second slide mechanism has a self-locking function instead of the conventional screw shaft mechanism. For example, even when a rack and pinion mechanism that cannot be expected is used, the improper displacement locking mechanism can be reliably functioned in the event of a vehicle front collision.
According to the vehicle seat of the second aspect, the lock assist mechanism can be operated by tilting the assist lever up and down without using a special drive source. That is, the auxiliary lever is tilted to the upper restriction position against the spring bias by the backward movement of the lift support base by the first slide mechanism, and when the lift support base moves forward, the auxiliary lever is moved to the lower retracted position by the spring bias. Returned to In a state where the elevating support base is retracted and the seat main body is located at the seating position, the auxiliary lever is located at the restricting position, and when a seat belt load is applied to the seat main body, the rear restricting portion is formed by the rear side of the auxiliary lever. Is guided obliquely upward and forward, the horizontal movement of the seat body to the front is restricted, and the rear portion thereof is displaced upward, so that the biasing displacement lock mechanism functions reliably.
According to the vehicle seat of claim 3, the timing of the backward movement of the seat main body and the tilting operation of the auxiliary lever is appropriately set, so that the rear portion restricting portion assists in the state where the seat main body is located at the seating position. Located behind the lever. That is, the rear restricting portion of the seat body is moved from the front side to the rear side of the auxiliary lever by the backward movement of the seat body, and then the auxiliary lever is tilted to the upper restricting position by the lifting support base. For this reason, in a state where the seat main body is located at the seating position facing the front of the vehicle, the auxiliary lever is located at the restricting position and located on the front side of the rear restricting portion of the seat main body, thereby moving the rear restricting portion and thus to the front of the seat main body. When the seat belt load is applied, the rear restricting portion is guided obliquely forward and upward by the rear side of the auxiliary lever, so that the unauthorized displacement locking mechanism can function reliably. it can.

Next, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a vehicle M provided with a vehicle seat 100 described below as a driver seat on the right side of the front row of the vehicle. The vehicle seat 100 is different from the conventional second slide mechanism 60 of the vehicle seat 1 described above, and the other basic configurations and operations are the same. Accordingly, in the description of the vehicle seat 100 according to the present embodiment, the same reference numerals are used as appropriate for the same members and configurations.
As shown in FIG. 1, the vehicle seat 100 includes a seating position (a position indicated by a solid line in the figure) with the seat body 10 facing the front of the vehicle and a boarding / alighting position facing the door opening D (see FIG. 1). A function of moving about 90 ° horizontally between the vehicle interior side and the door opening D toward the door opening D side. Yes. In FIG. 1, symbol H indicates a steering handle, symbol P1 indicates a passenger seat, and symbol P2 indicates a rear seat.
As shown in FIG. 2, the vehicle seat 100 includes a seat body 10 having a seat cushion 11 and a seat back 12. The seat body 10 is movable within a certain range in the vehicle front-rear direction by a front-rear slide mechanism 20 installed on the vehicle floor F. The front / rear slide mechanism 20 is installed on a unit base 23 fixed to the vehicle floor F. Slide rails 22 and 22 are fixed to the unit base 23 in parallel with each other along the vehicle longitudinal direction. The front and rear slide base 21 is supported via the slide rails 22 and 22 so as to be movable in the vehicle front-rear direction. Between the front / rear slide base 21 and the unit base 23, a screw shaft drive mechanism 24 having a front / rear slide motor 24a, a screw shaft 24b rotated thereby, and a nut 24c engaged with the motor 24a is interposed. A front / rear slide motor 24 a is installed on the unit base 23, a screw shaft 24 b is rotatably supported on the unit base 23, and a nut 24 c is fixed to the lower surface of the front / rear slide base 21. When the front / rear slide motor 24a is activated, the screw shaft 24b rotates about the shaft, whereby the nut 24c moves along the screw shaft 24b, whereby the front / rear slide base 21 moves horizontally within a certain range in the vehicle front-rear direction. .

A rotation base 35 is supported on the front / rear slide base 21 via a rotation mechanism 30 so as to be horizontally rotatable. The rotating mechanism 30 is mainly composed of a rotating disk 31 having an inner ring 31a and an outer ring 31b that are concentrically rotated with each other. The inner ring 31a is fixed to the front and rear slide base 21, and the rotating base is mounted on the upper surface of the outer ring 31b. 35 is fixed. A gear portion is provided on the outer periphery of the outer ring 31a, and a rotating gear 32a attached to the output shaft of the rotating motor 32 is engaged with the gear portion. The rotary motor 32 is installed on the front / rear slide base 21. When the rotation motor 32 is activated, the outer ring 31b is rotated, whereby the rotation base 35 and the seat body 10 are horizontally rotated.
An elevating support base 44 is supported on the rotation base 35 via a first slide mechanism 40 so as to be slidable in the horizontal direction. The first slide mechanism 40 includes a pair of left and right linear guide mechanisms 42, 42, a first slide motor 45a, and a screw having a trapezoidal screw shaft 45b and a nut 45c engaged with the screw shaft 45b. A shaft drive mechanism 45 is provided. The first slide motor 45a is installed on the rotation base 35, the screw shaft 45b is similarly rotatably supported on the rotation base 35, and the nut 45c is fixed to the lifting support base 44 side. For this reason, when the first slide motor 45a is activated, the screw shaft 45b rotates around the shaft, whereby the nut 45c moves along the screw shaft 45b, and the elevating support base 44 moves horizontally on the rotation base 35.
A pair of left and right lifting mechanisms 50, 50 are supported on both sides of the lifting support base 44. Both elevating mechanisms 50 and 50 include elevating arms 51 and 52, respectively. The base ends of the lift arms 51 and 52 are supported on the side of the lift support base 44 so as to be tiltable up and down. Further, as shown in FIG. 2, the outer lifting arms 51, 51 are disposed outside the inner lifting arms 52, 52.
A lifting base 55 is supported between the tilting tip portions of the pair of left and right lifting mechanisms 50, 50. The elevating base 55, the elevating support base 44, and the elevating arms 51 and 52 of the elevating mechanism 50 that couples the bases 44 and 55 constitute a four-bar parallel link mechanism. The outer elevating arms 51, 51 of the elevating mechanisms 50, 50 are respectively placed on receiving rollers 53 provided at the outdoor end of the rotation base 35.
Therefore, when the lifting support base 44 moves on the rotation base 35 from the vehicle interior side to the vehicle exterior side by the operation of the first slide mechanism 40, the distance between the receiving roller and the lift support base 44 becomes small. Ascending / descending arms 51, 51, 52 and 52 constituting the parallel link mechanism tilt downward and the ascending / descending base 55 moves downward while moving outwardly from the passenger compartment. Conversely, when the lifting support base 44 moves from the outside of the passenger compartment to the inside of the passenger compartment, the distance between the lifting support base 44 and the receiving roller increases, so that the lifting arms 51, 51, 52, 52 tilt upward and move up and down. The base 55 translates upward while moving toward the vehicle interior side.
The seat base 10 is moved up and down while maintaining a seating posture between the vehicle interior sides by moving the lift base 55 in parallel up and down while moving between the vehicle interior and the exterior.

A seat holder 75 is slidably supported on the lift base 55 via a second slide mechanism 70. The sheet body 10 is fixed on the sheet holder 75. The second slide mechanism 70 includes a pair of left and right linear guide mechanisms 74 and 74 and a rack and pinion drive mechanism 76. The linear motion guide mechanism 74 includes a linear motion rail 74 a and a slide block 74 b movably combined therewith. The linear motion rail 74 a is fixed to the lower surface of the seat holder 75, and the slide block 74 b is the lift base 55. It is fixed on the top surface.
The rack and pinion drive mechanism 76 includes a second slide motor 71 mounted on the lifting base 55, a pinion gear 72 mounted on the output shaft of the second slide motor 71, and a rack 73 in which the pinion gear 72 is engaged. . The rack 73 is attached to the lower surface of the sheet holder 75. The rack 73 is fixed with its longitudinal direction along the front-rear direction of the seat body 10. The rack 73 is fixed in parallel with the linear motion rails 74 a and 74 a of the left and right linear motion guide mechanisms 74 and 74.
When the second slide motor 71 is activated, the pinion gear 72 is rotated, and the rack 73 engaged with the pinion gear 72 is moved with respect to the lifting base 55, and thus the seat body 10 is moved in the front-rear direction.
The vehicle seat 100 configured as described above operates as follows and can easily get on and off the vehicle M. When the seat body 10 is moved from the passenger compartment to the exterior of the passenger compartment (alighting mode), the door 10 is moved from the seating position shown in FIG. It is rotated about 90 ° toward the opening D side. FIG. 6 shows a state in which the seat body 10 is directed to the door opening D side.
Next, as shown in FIG. 7, the second slide motor 71 of the second slide mechanism 70 is first activated toward the dismounting side in a state where the seat body 10 is directed to the door opening D side. When the second slide motor 71 is activated on the getting-off side, the pinion gear 72 is rotated and the rack 73 is moved to the outside of the passenger compartment, whereby the seat body 10 is outside the passenger compartment with respect to the lift base 55 (door opening D side). Moved horizontally.

Thereafter, as shown in FIG. 8, the first slide mechanism 40 operates toward the dismounting side, and the lifting support base 44 moves on the rotation base 35 to the door opening D side (left side in FIG. 8). As the elevating support base 44 moves to the door opening D side, the left and right elevating mechanisms 50, 50 are integrally moved to the outside of the passenger compartment and tilted in a direction in which the front end side is displaced downward. When the elevating support base 44 moves outside the vehicle compartment and the left and right elevating mechanisms 50 and 50 tilt downward, the elevating base 55 moves down to the height close to the road surface while moving outside the vehicle compartment. Thus, the elevating base 55 is lowered while moving to the outside of the passenger compartment, whereby the seat body 10 is translated in parallel to the outside of the passenger compartment while maintaining its seating posture. Thus, the seat main body 10 is lowered to the outside of the passenger compartment and is taken out, so that the seated vehicle can be easily seated on the seat main body 10, and conversely, the seat main body 10 can easily stand up from the seat main body 10.
When a seated person sits on the seat body 10 taken out of the passenger compartment, and when the seat body 10 that has risen from the seat body 10 and is vacant is returned to the passenger compartment (riding mode), each mechanism is Operate in reverse order. That is, in the state shown in FIG. 8, the first slide mechanism 40 is first moved to the boarding mode side and the lifting support base 44 is moved to the vehicle interior side, whereby the left and right lifting mechanisms 50, 50 are tilted upward. Returned to the passenger compartment. As a result, the elevating base 55 and the seat body 10 move to the vehicle interior side while rising while maintaining the sitting posture.
After the elevating support base 44 is returned to the slide rear end position of the first slide mechanism 40 and the seat body 10 is returned to the height shown in FIG. 7, the second slide mechanism 70 is operated to the riding mode side, and the seat The main body 10 is moved horizontally to the vehicle interior side. As shown in FIG. 6, after the seat body 10 is returned to the slide rear end position of the second slide mechanism 70, the front and rear slide mechanism 20 and the rotation mechanism 30 operate toward the boarding mode side, and the seat body 10 moves backward while the seat body 10 moves backward. It is rotated horizontally to the front facing position. Thus, when the seat body 10 is returned to the seating position facing the front of the vehicle, the seating of the seated person is completed.

  Next, in the vehicle seat 100 of the present embodiment that operates as described above, when the seat body 10 is located at the seating position, the seat body 10 is retracted with respect to the lifting base 55. For this reason, as shown in FIG. 4, the slide blocks 74 b and 74 b of the linear motion guide mechanisms 74 and 74 are relatively positioned at the front portion of the linear motion rail 74 a at the seating position and the position in front thereof, respectively. As a result, the sheet body 10 is added to the second slide mechanism 70 as an overhang load. Therefore, a support roller 15 is rotatably supported at the rear portion of the sheet main body 10 of the present embodiment. On the other hand, flat guide surfaces 51a, 51a are provided on the upper surfaces of the lifting arms 51, 51b of the left and right lifting mechanisms 50, 50 on the tilting base end side. The support roller 15 is placed on each of the guide surfaces 51a and 51a, and the overhang load of the sheet body 10 is received. As described above, the front portion of the sheet body 10 is supported by the lift base 55 via the second slide mechanism 70, and the rear portion thereof is supported by the lift support base 44 via the support roller 15. When the seat body 10 moves forward relative to the lifting base 55 by the operation of the second slide mechanism 70, the support roller 15 rolls on the guide surface 51 a of the outer lifting arm 51. In the second slide mechanism 70, when the slide blocks 74b and 74b move relatively near the center of the linear motion rail 74a and the overhang load of the sheet body 10 becomes small, the support roller 15 moves from the guide surface 51a of the outer arm 51. break away.

Next, as shown in FIG. 3, the vehicle seat 100 of this embodiment includes an unauthorized displacement locking mechanism R for restricting unauthorized displacement when a large seat belt load I is applied to the seat body 10. ing. This is the same as in the prior art. The unauthorized displacement locking mechanism R includes a hook 90 and an engagement bracket 80. As shown in FIGS. 3 and 4, the hook 90 projects downward from the sheet main body 10 and bends in an L-shape, and a hooking portion 90 a is provided at the tip thereof. An engaging bracket 80 is attached to the side of the rotary base 35 corresponding to the hook 90. An engagement hole 80 a that penetrates the seat body 10 in the front-rear direction (left-right direction in FIGS. 3 and 4) is provided in the upper portion of the engagement bracket 80.
A seat belt buckle B is attached to the side of the seat body 10 and in the vicinity of the hook 90.
Further, an unauthorized displacement locking mechanism Z similar to the conventional one is provided below the upper unauthorized displacement locking mechanism R. As shown in FIG. 2, the lower unauthorized displacement locking mechanism Z includes a hook bracket 95 attached to a side portion of the rotation base 35 and a receiving bracket 85 fixed on the vehicle floor F. When the hooking portion 95a of the hooking bracket 95 is engaged with the receiving portion 85a of the receiving bracket 85 from below, the rotation base 35 is coupled to the vehicle floor F side with respect to the upward displacement thereof. Since this point is the same as in the prior art, a detailed description is omitted.

When the seat body 10 is positioned at the seating position facing the front of the vehicle indicated by the solid line in FIG. 1, the hooking portion 90 a of the hook 90 is engaged with the engaging bracket 80 in the upper unauthorized displacement locking mechanism R as shown in FIGS. 3 and 4. It will be in the state inserted from the front side with respect to the engagement hole 80a. Therefore, when the seat body 10 moves forward or backward by the operation of the first slide mechanism 40 or the second slide mechanism 70, the hooking portion 90a of the hook 90 is an engagement bracket as shown by a two-dot chain line in FIG. It enters or leaves the 80 engagement holes 80a without any restriction. Therefore, the movement operation of the seat body 10 performed by the operation of the first slide mechanism 40 or the second slide mechanism 70 is smoothly performed without any trouble. In addition, in the lower improper displacement locking mechanism Z, the hooking portion 95a of the hooking bracket 95 is positioned below the receiving portion 85a of the receiving bracket 85 with a slight gap. Therefore, both the movement operation of the seat body 10 in the front-rear direction by the front-rear slide mechanism 20 and the horizontal rotation operation of the seat body 10 by the rotation mechanism 30 are allowed. These points are also the same as those of the conventional configuration shown in FIG.
On the other hand, when a large seat belt load I is applied to the seat body 10 via the buckle B at the time of a frontal collision of the vehicle or the like, the front direction of the seat body 10 (front obliquely upward, white in FIG. 4) Therefore, an external force (seat belt load I) in a direction to be displaced upward is applied to the rear portion of the seat body 10. Immediately after the rear portion of the seat body 10 starts to be displaced in an illegal direction obliquely upward and forward by the seat belt load I, the hook portion 90a of the hook 90 is hooked on the upper end portion of the engagement hole 80a of the engagement bracket 80. As a result, the unauthorized displacement of the rear portion of the seat body 10 toward the front obliquely upward is firmly prevented.
Further, as a result of the seat body 10 being coupled to the rotation base 35 via the upper unauthorized displacement locking mechanism R as described above, an external force in the direction of displacement upward (unauthorized direction) is applied to the rotation base 35, As a result, in the lower unauthorized displacement locking mechanism R, the hooking portion 95a of the hooking bracket 95 is engaged with the receiving portion 85a of the receiving bracket 85 from the lower side, and the rotation base 35 is coupled to the vehicle floor F side. The Thus, the seat body 10 is coupled to the vehicle floor F side through the upper and lower unauthorized displacement locking mechanisms R and Z, so that the seat belt load I is received on the vehicle floor F side. As a result, the seat body 10 is moved in the unauthorized direction. Displacement can be regulated.

As described above, when a large seat belt load I is applied to the seat main body 10 at the time of a frontal collision of the vehicle seat 100 according to the present embodiment, the rear portion of the seat main body 10 is received. Unauthorized displacement locking mechanisms R and Z for preventing unauthorized displacement upward are provided. The hook 90 of the upper unauthorized displacement locking mechanism R functions on the assumption that when the seat belt load I is applied to the seat body 10, the seat body 10 does not move horizontally to the front of the vehicle. That is, as described above, the hook 90 is not engaged with the engagement bracket 80 during the normal operation in which the seat body 10 moves horizontally by the operation of the first slide mechanism 40 or the second slide mechanism 70. When the seat body 10 moves horizontally before the hook 90a of the hook 90 is hooked in the engagement hole 80a of the engagement bracket 80, the hook 90a of the hook 90 is Accordingly, the improper displacement locking mechanism R does not function.
Here, since the first slide mechanism 40 is mainly composed of a screw shaft drive mechanism 45 having a screw shaft 45b of a trapezoidal screw, the seat body 10 moves horizontally unless the screw shaft 45b is positively rotated by the first slide motor 45a. In addition, since the seat body 10 has a so-called self-locking function, even if the seat belt load I is applied to the seat body 10, the seat body 10 does not move horizontally depending on the first slide mechanism 40. On the other hand, in the vehicle seat 100 of the present embodiment, the second slide mechanism 70 operates mainly with the rack and pinion mechanism 76, thereby making the height direction more compact than in the case of using the conventional screw shaft mechanism. It has a configuration that realizes. The rack and pinion mechanism 76 cannot be expected to have a self-locking function like a screw shaft mechanism. For this reason, unless a special measure is taken, the second slide motor 71 is not activated in the second slide mechanism 70 when a large seat belt load I is applied to the seat body 10 at the time of a frontal collision of the vehicle. Nevertheless, the seat body 10 moves horizontally forward as the rack 73 moves forward (reverse input of power) while rotating (idling) the pinion gear 72, and as a result, the hook 90 engages with the engagement bracket 80. There is a risk that they will not be matched (the unauthorized displacement locking mechanism R will not function).

In this respect, the vehicle seat 100 of the present embodiment prevents the horizontal movement of the seat body 10 forward when a large seat belt load I is applied to the seat body 10 due to a frontal collision of the vehicle or the like, and an illegal displacement lock mechanism. A lock assist mechanism 110 is provided to ensure that R functions. Details of the lock assist mechanism 110 are shown in FIGS. The lock assist mechanism 110 includes an auxiliary lever 111 provided at the rear part of the rotation base 35, a lever operating part 120 and a receiving part 125 provided integrally with the lifting support base 44, and a rear restricting part 130 provided on the seat holder 75. I have.
The auxiliary lever 111 is supported by a bracket portion 35a provided at the center rear end portion in the width direction of the rotation base 35 via a support shaft 112 so as to be able to tilt up and down between an upper restriction position and a lower retraction position. . A torsion spring 113 is interposed around the support shaft 112 and between the auxiliary lever 111 and the bracket portion 35a. The auxiliary lever 111 is urged by the torsion spring 113 in a direction in which the auxiliary lever 111 is tilted downward. 9 and 10 show a state in which the auxiliary lever 111 is located at the lower retracted position, and FIG. 11 shows a state in which the auxiliary lever 111 is located at the upper restricted position.
The lever operating part 120 and the receiving part 125 are provided at the center rear part in the width direction of the elevating support part base 44, respectively. The lever operating part 120 is provided on the front side and the lower side of the receiving part 125. The lever operating portion 120 and the receiving portion 125 are provided so as to project obliquely downward and rearward, and the respective distal end sides are bent in an L shape. The lever operating part 120 and the receiving part 125 move integrally with the elevating support base 44 while maintaining a predetermined interval appropriately set in the front-rear direction and the up-down direction.
The rear regulating portion 130 is integrally provided at the center rear end portion in the width direction of the sheet holder 75. A stopper edge 131 having a substantially flat plate shape is integrally provided at the center rear end of the sheet holder 75 in the width direction. A stopper rubber 132 made of elastic rubber is attached to the upper surface side of the stopper edge 131. The stopper rubber 132 is elastically pressed from the front side against the receiving portion 125 of the lifting support base 44 when the seat body 10 is positioned at the seating position in the passenger compartment, whereby the lifting support base 44 of the seat holder 75 is supported. This prevents rattling and vibration absorption at the rear end position of the slide.
A rear regulating portion 130 is integrally fixed to the lower surface side of the stopper edge 131 by screws. The rear restricting portion 130 protrudes forward from the stopper edge 131, and its tip end extends obliquely upward and forward.

According to the lock assist mechanism 110 configured as described above, when a large seat belt load I is applied to the seat body 10 due to a vehicle front collision or the like in a state where the seat body 10 is positioned at the seating position in the vehicle interior. Therefore, it is possible to restrict the horizontal movement of the seat body 10 in the forward direction and to make the unauthorized displacement locking mechanism R function reliably. As a result, the lower unauthorized displacement locking mechanism Z also functions so that the seat belt load I is applied to the vehicle floor. It can be received firmly on the F side.
First, in the process of the riding mode operation (the process of returning from the position shown in FIG. 8 to the position shown in FIG. 6) in which the seat body 10 is returned from the outside to the inside of the vehicle interior, the operation of the first slide mechanism 40 is performed as described above. Thus, when the lifting support base 44 is returned to the vehicle interior side, the first slide mechanism 40 is temporarily stopped just before the lifting support base 44 reaches the slide rear end position (on the left side of the position shown in FIG. 7). . This state is shown in FIG. In this state, the receiving portion 125 and the lever operating portion 120 are both positioned in front of the auxiliary lever 111 (left side in FIG. 9). For this reason, the auxiliary lever 111 is still in the lower retracted position due to the urging force of the torsion spring 113.
In this manner, with the lifting support base 44 being temporarily stopped before the slide rear end position, the second slide mechanism 70 operates to the riding mode side, and the seat body 10 moves to the vehicle interior side. When the seat body 10 reaches the slide rear end position of the second slide mechanism 70, the stopper rubber 132 comes into contact with the receiving portion 125, and at this stage, the second slide mechanism 70 is stopped. The state at this stage is shown in FIG. At this stage, the regulating lever 130 on the seat body 10 side is positioned in front of the auxiliary lever 111. At this stage, the second slide mechanism 70 is operated to the rear end of the slide, and the operation in the riding mode is completed. Therefore, the seat body 10 is brought into the slide rear end position with respect to the lifting support base 44. Has reached.
Next, the first slide mechanism 40 is operated again in the boarding mode, so that the lifting support base 44 moves backward for the remaining slight stroke. At this stage, the seat body 10 is also integrated with the lifting support base 44 and returned to the vehicle interior side by a slight stroke.

As the elevating support base 44 retreats the remaining slight stroke to the slide rear end position, the auxiliary lever 111 is pushed by the lever operating portion 120 and tilted to the upper restriction position against the torsion spring 113. This state is shown in FIG. In this state, the elevating support base 44 has reached the slide rear end position by the first slide mechanism 40, and the auxiliary lever 111 is pushed by the lever operating unit 120 and held at the upper restricting position, and at the rear part thereof. Is in a state in which the rear regulating portion 130 of the sheet main body 10 is in contact. The distance between the lever operating portion 120 and the receiving portion 125 in the front-rear direction and the vertical direction is such that the lever restricting portion 130 of the seat main body 10 is located behind the auxiliary lever 111 tilted to the upper restricting position by the lever operating portion 120. It is set appropriately so as to realize the contact state.
In this manner, the seat body 10 is returned to the slide rear end position with respect to the lift support base 44 by the second slide mechanism 70 by the operation in the riding mode, and the lift support base 44 is changed to the rotation base 35 by the first slide mechanism 40. On the other hand, after being returned to the slide rear end position, the seat body 10 is returned to the vehicle rear side while rotating from the door opening D side to the position facing the front of the vehicle by the rotation mechanism 30 and the front / rear slide mechanism 20, and the boarding mode. A series of operations of time is completed.
When the operation in the riding mode is completed, the auxiliary lever 111 is held at the upper restriction position by the lever operation unit 120, and the restriction lever 130 on the seat body 10 side is in contact with the rear part of the auxiliary lever 111. ing. In a state where the restriction lever 130 is in contact with the rear portion of the auxiliary lever 111, the restriction lever 130 is allowed to move forward and obliquely upward along the rear portion of the auxiliary lever 111, but is prevented from moving horizontally forward. It is in a state. For this reason, the horizontal movement of the seat body 10 to the front is restricted, and the rearward portion of the seat body is allowed to be displaced obliquely forward and upward.
When the operation in the riding mode is completed, the hook 90a of the hook 90 on the seat body 10 side is engaged with the engagement bracket 80 on the rotation base 35 side in the upper unauthorized displacement locking mechanism R as shown in FIG. The hooking portion 95a of the hooking bracket 95 on the rotating base 35 side is below the receiving portion 85a of the receiving bracket 85 on the vehicle floor F side in the state of being inserted into the joint hole 80a. It is in the state located with a gap. In this state, a seated person sits on the seat body 10 and the vehicle M travels.

As described above, according to the vehicle seat 100 of the present embodiment, when a large seat belt load I is applied to the seat body 10 via the buckle M due to a vehicle frontal collision or the like, the upper and lower unauthorized displacement locking mechanisms R, The seat body 10 is coupled to the vehicle floor F through Z, and the seat belt load I is firmly received on the vehicle floor F side, thereby preventing the displacement of the seat body 10 in the front turning direction (incorrect direction) and The seat body 10 is held in a normal position (a state where the rear portion of the seat body 10 is not lifted from the vehicle floor F).
The unauthorized displacement locking mechanisms R and Z function reliably with the lock assist mechanism 110. According to the lock assist mechanism 110, the restriction lever 130 on the seat body 10 side is brought into contact with the rear portion of the assist lever 111 held at the upper restriction position by the lever operation portion 130, and the rear oblique portion of the seat body 10 is inclined forward. While the upward displacement is allowed, the forward horizontal displacement is restricted, so that when a large seat belt load I is applied to the seat body 10 due to a frontal collision of the vehicle, etc., the unauthorized displacement lock The hook 90 of the mechanism R is securely engaged with the engagement bracket 80, and as a result, the hook portion 95a of the hook bracket 95 is securely engaged with the receiver portion 85a of the bracket 85, so that the seat body 10 is secured to the vehicle floor F. The seat belt load I can be reliably received on the vehicle floor F side.
From this, the first slide mechanism 40 can use a screw shaft mechanism having a self-lock function, while the second slide mechanism 70 can use a rack and pinion mechanism 76 that does not have a self-lock function like the screw shaft mechanism. Thus, the second slide mechanism 70 and thus the vehicle seat 100 can be configured compactly in the height direction.
Further, as described above, the auxiliary lever 111 in the lock auxiliary mechanism 110 for functioning the unauthorized displacement locking mechanisms R and Z reliably functions mainly between the restricting position and the retracted position by using the moving operation of the elevating support base 44. Therefore, since a special drive source for that purpose is not required, the above-described effects can be obtained with a simple configuration and a reliable operation can be realized.

  The embodiment described above can be implemented with various modifications. For example, the restriction lever 130 provided on the sheet body 10 side is provided integrally with the stopper edge 131 provided on the sheet holder 75, but is provided directly on the sheet holder 75 without depending on this kind of stopper edge 131. It is good. Even in this case, the regulating lever is brought into contact with the rear part of the auxiliary lever 111, and when a seat belt load is applied, the front side of the seat main body 10 is horizontally guided by guiding it forward and obliquely upward along the rear part of the auxiliary lever 111. By restricting the movement and displacing the rear part thereof obliquely upward and upward, the upper unauthorized displacement locking mechanism R functions reliably, and consequently the lower unauthorized locking mechanism Z functions reliably, and the seat belt load I is applied to the vehicle. It can be received on the floor F side.

1 is a plan view of a vehicle equipped with a vehicle seat according to an embodiment of the present invention in a driver's seat. It is the figure which looked at the vehicle seat which concerns on this embodiment from the arrow (2) direction in FIG. 1, Comprising: It is a front view of a vehicle seat. It is the figure which looked at the vehicle seat which concerns on this embodiment from the arrow (3) direction in FIG. 2, Comprising: It is the left view of a vehicle seat. It is a side view of an unauthorized displacement lock mechanism. FIG. 4 is a left side view of the vehicle seat according to the present embodiment, as in FIG. 3. In this figure, the illustration of the unauthorized displacement locking mechanism is omitted. It is a figure which shows operation | movement of the vehicle seat of this embodiment. This figure is the figure seen from the vehicle front side. This figure has shown the state by which the sheet | seat main body was orient | assigned to the door opening part side. It is a figure which shows operation | movement of the vehicle seat of this embodiment. This figure is the figure seen from the vehicle front side. This figure shows a state in which the seat body directed to the door opening side is horizontally moved to the outside of the passenger compartment. It is a figure which shows operation | movement of the vehicle seat of this embodiment. This figure is the figure seen from the vehicle front side. This figure has shown the state which descend | falled to the vehicle compartment outer side. It is a figure which shows operation | movement of the lock | rock assistance mechanism which concerns on this embodiment. This figure shows a state in which the seat body is directed toward the door opening and viewed from the front side of the vehicle. This figure shows a state in which the elevating support base is stopped at a position before the rear end of the slide, and the seat body is returned to the position before the rear end of the slide of the second slide mechanism. It is a figure which shows operation | movement of the lock assistance mechanism which concerns on this embodiment. This figure has shown the state which looked at the state by which the seat main part was turned to the door opening part side from the vehicle front side. This figure shows a state where the elevating support base is stopped before the slide rear end and the seat body is returned to the slide rear end of the second slide mechanism. It is a figure which shows operation | movement of the lock assistance mechanism which concerns on this embodiment. This figure has shown the state which looked at the state by which the seat main part was turned to the door opening part side from the vehicle front side. This figure shows the stage where the seat body is returned to the slide rear end of the second slide mechanism and the lifting support base is returned to the slide rear end of the first slide mechanism, and the lock assist mechanism is in a functioning state. ing. FIG. 6 is a left side view of a vehicle seat using a screw shaft mechanism as a second slide mechanism that slides the seat body with respect to the lifting support base. This figure has shown the state which looked at the said driver's seat vicinity of the vehicle in which the said vehicle seat was installed in the driver's seat position from the passenger seat side.

Explanation of symbols

M ... Vehicle F ... Vehicle floor B ... Seat belt buckle 1,100 ... Vehicle seat 10 ... Seat body 20 ... Front / rear slide mechanism 21 ... Front / rear slide base, 22 ... Slide rail 24 ... Screw shaft mechanism 30 ... Rotation mechanism 35 ... Rotating base 40 ... 1st slide mechanism (screw shaft type)
44 ... Lifting support base 45 ... Screw shaft drive mechanism 50 ... Lifting mechanism 55 ... Lifting base 60 ... Second slide mechanism (screw shaft type)
70 ... Second slide mechanism (rack and pinion type)
71 ... second slide motor 72 ... pinion gear 73 ... rack 75 ... seat holder 76 ... rack and pinion drive mechanism R ... illegal displacement lock mechanism (upper side)
Z ... Incorrect displacement locking mechanism (lower side)
DESCRIPTION OF SYMBOLS 80 ... Engagement bracket, 80a ... Engagement hole 85 ... Receiving bracket 90 ... Hook, 90a ... Hook part 95 ... Hook bracket I ... Seat belt load 110 ... Lock auxiliary mechanism 111 ... Auxiliary lever 113 ... Torsion spring 120 ... Lever Operation part 125 ... receiving part 130 ... rear part regulating part 132 ... stopper rubber

Claims (3)

A seat body, a rotation mechanism for horizontally rotating the seat body between a position facing the front of the vehicle and a position facing the door opening, and the seat interposed between the rotation mechanism and the seat body A first slide mechanism for horizontally moving the main body; an elevating base supported by the elevating support base of the first slide mechanism via the elevating mechanism; and a horizontal movement of the seat body installed on the elevating base. A vehicle seat provided with a second slide mechanism and an unauthorized displacement lock mechanism that allows the seat body to move horizontally forward of the vehicle while restricting unauthorized displacement upward of the rear portion when a seat belt load is applied. There,
A lock assist mechanism for guiding the upward movement of the seat body with respect to the rear portion of the seat body while restricting horizontal movement of the seat body toward the front of the vehicle and causing the unauthorized displacement lock mechanism to function. Vehicle seats. 2. The vehicle seat according to claim 1, wherein the lock assist mechanism is tiltable between an upper restriction position and a lower retraction position on a rotation base that is horizontally rotated by the rotation mechanism, and toward a lower retraction position side. An auxiliary lever that is provided with a spring bias and is tilted to the restriction position against the spring bias by a backward movement of the lifting support base of the first slide mechanism, and is provided integrally with a rear portion of the seat body. A rear regulating part
In a state where the seat main body is located at the seating position, the vehicle seat is configured such that the rear restricting portion is brought into contact with the rear side of the auxiliary lever to guide forward and obliquely upward while restricting forward horizontal movement. 3. The vehicular seat according to claim 2, wherein after the rear restricting portion has passed to the rear side of the auxiliary lever by a backward movement of the seat body in a state where the auxiliary lever is located at the retracted position, the lifting support base A vehicular seat configured to tilt the auxiliary lever to an upper restriction position by a backward movement operation.

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