JP2007168703A - Vehicular seat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To lower an attaching position of a seat to a floor as compared with a conventional one, to retract the seat at the time of head-on collision of a vehicle, and to prevent the seat from retracting when collided from a rear end. <P>SOLUTION: A moving member fixing means 30 is provided, which retracts a moving member 19 attached to lower rails 16a, 16b when impact force is acted. The lower rails 16a, 16b are provided with a pair of plate materials 18a, 18b superimposed on both sides of the moving member. The moving member is attached to the pair of plate material so as to move in a fore-and-aft direction. The moving member fixing means comprises a pair of locked members 31 provided on the pair of plate material, a housing 32 provided on the moving member between the locked members, a pair of locking installations provided on the housing from both side portions , a sliding piece 35 prohibiting sinking of the locking installations at a first position and permitting that at a second position, an impact force sensor 42, and a driving means 41 moving the sliding piece 35 to the second position 37 when the impact force sensor 42 detects the impact force. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a vehicle seat having fixing means for fixing at an arbitrary position, and retracting the seat at the time of a frontal collision of the vehicle.

  Conventionally, as a vehicle seat, as shown in FIG. 19, the lower rail 3 is disposed on the floor 2 so as to extend in the traveling direction of the vehicle, and the upper rail 6 is fixed to the seat cushion 4 a so as to face the lower rail 3. It is known that the upper rail 6 is attached to the lower rail 3 so as to be movable in the front-rear direction via a fixing means 7 for fixing the seat 4 at an arbitrary position and a retreat means 8 for retreating the seat 4 at the time of a frontal collision (for example, , See Patent Document 1). The seat fixing means 7 in this mounting structure has a first auxiliary rail 7a having the same length as that of the upper rail 6 attached to the upper rail 6 so as to be movable in the front-rear direction, and a hole (not shown) along the longitudinal direction of the first auxiliary rail 7a. An attached plate is attached, and an L-shaped adjustment handle 7c is attached to the upper rail 6 so as to be rotatable along the longitudinal direction of the upper rail 6 and with the axis as a center of rotation. A base end of a claw member that can be inserted into the adjustment handle 7c is fixed to the adjustment handle 7c, and a coil spring that rotates the adjustment handle 7c in a direction in which the tip of the claw member is inserted into the square hole is wound around the adjustment handle 7c. Has been disclosed. In this seat fixing means, the seat 4 can be fixed at an arbitrary position in the front-rear direction of the vehicle by arbitrarily selecting a square hole into which the tip of the claw member is inserted.

On the other hand, the seat retracting means 8 is attached to the lower rail 3 such that the second auxiliary rail 8a having the same length as the lower rail 3 is movable in the front-rear direction, and the second auxiliary rail 8a is attached to the first auxiliary rail 7a of the seat fixing means 7. And an elastic body 8b that urges the upper rail 6 in the forward direction, and a plurality of locked portions 8c are provided on the lower rail 3, and can be selectively locked to the locked portions 8c. A locking tool 8d that allows the upper rail 6 to move back against the urging force of the elastic body 8a and prevents the upper rail 6 from moving forward by the elastic force of the elastic body 8b is provided. In the seat retracting means 8, when a rearward load of a predetermined value or more acts on the seat cushion 4a due to the frontal collision of the vehicle and the front of the vehicle entering the passenger compartment, the first and second auxiliary rails 7a and 8a The upper rail 6 moves backward against the elastic force of the elastic body 8b together with the intermediate moving member 9 so that the driver can easily escape from the collision vehicle.
JP-A-10-250435

However, in the above conventional vehicle seat, the upper rail 6 fixed to the seat cushion 4a of the seat 4 is attached to the lower rail 3 disposed on the floor 2 via the first and second auxiliary rails 7a and 8a. There is a problem that the position of the seat 4 with respect to the floor 2 is increased. That is, in the conventional vehicle seat, the upper rail 6, the first auxiliary rail 7a, the second auxiliary rail 8a, and the lower rail 3 are interposed between the seat 4 and the floor 2 so as to overlap in the vertical direction. A roller accommodating portion is formed between the upper rail 6 and the first auxiliary rail 7a, and between the second auxiliary rail 8a and the lower rail 3, and this accommodating portion is indicated by a broken line in order to facilitate the mutual movement. A roller 7e and a roller 8e are accommodated, respectively. Therefore, the position of the seat 4 with respect to the floor 2 becomes higher due to the interposition between the seat 4 and the floor 2, and when the position of the seat 4 becomes higher, the hip point when the driver sits on the seat 4 is increased. Has changed, affecting the operability of the steering wheel and various switches on the driver's seat.
Further, the conventional seat retraction means 8 has a problem that when a vehicle collides with the vehicle from behind, a backward load of a predetermined value or more acts on the seat cushion and the seat moves backward.
An object of the present invention is to provide a vehicle seat that does not affect the operability of the steering wheel and various switches on the driver's seat by reducing the seat mounting position relative to the floor.
Another object of the present invention is to provide a vehicle seat that can reliably retract the seat at the time of a frontal collision of the vehicle, but can prevent the seat from retreating when impacted from behind.

  As shown in FIGS. 1 and 11, the invention according to claim 1 is a pair of lower rails 16a and 16b arranged on the floor 11a so as to extend in the traveling direction of the vehicle 10 with a predetermined interval in the vehicle width direction. A pair of upper rails 17a and 17b fixed to the seat cushion 13a of the seat 13 so as to face the pair of lower rails 16a and 16b, respectively, and attached to the pair of lower rails 16a and 16b so as to be movable in the front-rear direction. A moving member 19 attached to the lower rails 16a and 16b so as to be movable in the front-rear direction, and the moving member 19 retracts with respect to the pair of lower rails 16a and 16b when an impact force of a predetermined value or more acts on the seat 13 from the front. The moving member fixing means 30 for fixing the moving member 19 to the pair of lower rails 16a and 16b and the pair of upper arrays 17a, 17b is an improvement of a vehicle seat that includes a seat fixing unit 20 that is configured to selectively secure the desired position in the longitudinal direction of the moving member 19.

  The characteristic configuration is that a pair of lower plates 16a and 16b are provided with a pair of plate members 18a and 18b superposed on both sides of the moving member 19, and the moving member 19 is attached to the pair of plate members 18a and 18b so as to be movable in the front-rear direction. The moving member fixing means 30 is provided on the pair of locked members 31, 31 provided on the inner side of the pair of plate members 18a, 18b, and on the moving member 19 between the pair of locked members 31, 31. A pair of housings 32 and a pair of housings 32, the base ends of which are provided so as to protrude from both sides so as to be immersible laterally, and the protruding tips are configured to be locked to the pair of locked members 31, 31. The pair of latches 33, 33 and the first position 36 between the pair of latches 33, 33, which are accommodated in the housing 32, prohibit the immersion of the pair of latches 33, 33, and the pair of latches 33, Between 33 A sliding piece 35 that allows the pair of locking members 33 and 33 to be immersed at a second position 37 inside the housing 32 that has been removed, an impact force sensor 42 that detects an impact force acting on the vehicle 10 from the front, and an impact Drive means 41 for moving the sliding piece 35 from the first position 36 to the second position 37 when the force sensor 42 detects an impact force of a predetermined value or more is provided.

  In the vehicle seat according to the first aspect, the movable member 19 is attached to the pair of plate members 18a and 18b provided on the lower rails 16a and 16b so as to be movable in the front-rear direction, and the seat fixing means 20 is attached to the movable member 19. Since the moving member fixing means 30 is provided, the upper rails 17a and 17b can be directly attached to the lower rails 16a and 16b. Then, by attaching the upper rails 17a and 17b directly to the lower rails 16a and 16b, the mounting position of the seat 13 with respect to the floor 11a as compared with the conventional mounting structure in which the upper rail and the lower rail are mounted via the first and second auxiliary rails. Can be reduced.

Further, in this vehicle seat, when the vehicle 10 collides with the front, the impact force sensor 42 detects an impact force of a predetermined value or more, and recognizes that the front collision has occurred based on the detection output. Is moved from the first position 36 to the second position 37. Then, the immersion of the pair of locking tools 33, 33 into the housing 32 is allowed, and when the pair of locking tools 33, 33 are immersed, the pair of locking tools 33, 33 and the locked member 31, The upper rails 17a and 17b can be moved rearward with respect to the lower rails 16a and 16b, so that the upper rails 17a and 17b can be moved by entering the front compartment of the vehicle 10 or inflating an air bag or the like. Retreats with the sheet 13.
On the other hand, even if the vehicle 10 is collided from behind, the impact force sensor 42 does not detect an impact force greater than a predetermined value, and the drive means 41 does not recognize that a frontal collision has occurred. Therefore, the sliding piece 35 stays at the first position 36 and maintains the pair of locking members 33, 33 in a state in which they cannot be immersed. As a result, the backward movement of the seat 13 when the vehicle 10 is collided from behind is prohibited.

The invention according to claim 2 is the invention according to claim 1, wherein the impact force sensor 42 is an acceleration sensor used in a deployment device of the airbag 45, and the sliding piece is generated by the gas generated by the driving means 41. It is a gas generator which moves 35 from the 1st position 36 to the 2nd position 37, It is characterized by the above-mentioned.
In the vehicle seat according to the second aspect, since the acceleration sensor 42 used in the deployment device of the airbag 45 is used as the impact force sensor, the number of parts is smaller than when the impact force sensor 42 is provided independently. It can be reduced and the unit price can be prevented from being pushed up. Further, since the driving means 41 is a gas generator conventionally used for deploying the airbag 45, it is possible to prevent the unit price from being pushed up by reducing the type of parts and reducing the management burden. .

In the vehicle seat of the present invention, the pair of lower rails is provided with a pair of plate members that are superposed on both sides of the moving member, and the moving member is attached to the pair of plate members so as to be movable in the front-rear direction. Since the moving member fixing means is provided, the upper rail can be directly attached to the lower rail, and the seat with respect to the floor is compared with the conventional mounting structure in which the upper rail and the lower rail are attached via the first and second auxiliary rails. The mounting position can be reduced.
Further, the moving member fixing means includes a pair of locked members respectively provided on the inner side of the pair of lower rails, a housing provided on the moving member between the pair of locked members, and the housing from both sides. A pair of locking devices each having a base end projecting from the side so as to be immersible and a projecting distal end configured to be locked by a pair of locked members, and a pair of locking tools built in the housing A sliding piece that prohibits the immersion of the pair of locking tools at the first position between them and allows the immersion of the pair of locking tools at the second position that deviates therefrom, and an impact force acting on the vehicle from the front are detected. An impact force sensor and drive means for moving the sliding piece from the first position to the second position when the impact force sensor detects an impact force greater than or equal to a predetermined value are provided. Can be moved backwards, but if it is hit from behind Kick it is possible to prevent the backward movement of the sheet.
Here, if the impact force sensor is an acceleration sensor used in an airbag deployment device, the number of components is reduced compared with the case where the impact force sensor 42 is provided independently, and the unit price is prevented from being pushed up. can do. Further, in the case of a gas generator that moves the sliding piece from the first position to the second position by the gas generated by the driving means, the driving means is a gas generator conventionally used for deploying an air bag. Therefore, it is possible to prevent the unit price from being increased due to the reduction of the management burden and the number of parts.

Next, the best mode for carrying out the present invention will be described with reference to the drawings.
As shown in FIG. 11, the cab 11 of the cab over type truck 10 is provided with a seat 13 facing the steering column 12 that rotatably holds the steering shaft 12a. The seat 13 includes a seat cushion 13a that receives the driver's hip, and a seat back 13c that is attached to the rear end of the seat cushion 13a via a reclining adjuster 13b and receives the driver's back. A cushion frame 13d that supports the seat cushion 13a is provided below the seat cushion 13a (FIG. 2). A pair of lower rails 16a and 16b are disposed on the floor 11a of the cab 11 so as to extend in the traveling direction of the track 10. The pair of upper rails 17a and 16b are disposed on the seat cushion 13a so as to face the pair of lower rails 16a and 16b, respectively. 17b is fixed.

  As shown in FIGS. 1 and 2, the pair of upper rails 17a and 17b has substantially the same length as the pair of lower rails 16a and 16b, and the pair of upper rails 17a and 17b extends the pair of lower rails 16a and 16b from above. It is attached so as to be movable along its longitudinal direction. As shown in FIG. 2, a roller accommodating portion is formed between the upper rails 17a and 17b and the lower rails 16a and 16b, and this accommodating portion is provided to facilitate the movement of the upper rails 17a and 17b along the lower rails 16a and 16b. Each accommodates a roller 15a. Further, spherical bodies 15b are respectively inserted between both outer surfaces of the lower rails 16a and 16b and inner surfaces of the upper rails 17a and 17b covering the lower rails 16a and 16b from above. The spherical body 15b is provided so as to prevent the upper rails 17a, 17b from coming off the lower rails 16a, 16b and to facilitate the movement of the upper rails 17a, 17b along the lower rails 16a, 16b by rolling them.

  As shown in detail in FIGS. 1 and 2, a pair of plate members 18a and 18b are attached between the floor 11a and the pair of lower rails 16a and 16b so as to extend in the front-rear direction along the pair of lower rails 16a and 16b. Between the pair of plate members 18a and 18b, there is provided a moving member 19 that is superposed on the pair of plate members 18a and 18b from below. The moving member 19 in this embodiment is a flat plate, and long holes 19a that are long in the front-rear direction are respectively formed on both sides of the moving member 19 that overlaps and faces the pair of plate members 18a and 18b. On the other hand, a locking pin 14 is fixed to the pair of plate members 18a and 18b so as to face the long hole 19a, and the locking pin 14 is inserted into and engaged with the long hole 19a. When the locking pin 14 moves inside the long hole 19a, the moving member 19 made of a flat plate is configured to be movable in the front-rear direction. The moving member 19 is connected to a pair of lower rails 16a, 18b via a pair of plate members 18a, 18b. It is attached to 16b so as to be movable in the front-rear direction. A pair of upper rails 17 a and 17 b is provided with a sheet fixing means 20 that selectively fixes the movable member 19 to an arbitrary position in the front-rear direction.

  The sheet fixing means 20 in this embodiment is inserted between the grooved plate 21 provided on the moving member 19 and the grooved plate 21 and the upper rails 17a and 17b, and the center is pivotally supported by the upper rails 17a and 17b. And an oscillating member 24. The grooved plate 21 is provided along the lower rails 16a and 16b on both sides of the moving member 19, and a number of concave grooves 21a (FIG. 1) are formed along the longitudinal direction of the rails 16a and 16b. The center of the swing member 24 is pivotally supported on the inner surfaces of the upper rails 17 a and 17 b facing the grooved plate 24 via a pivot pin 23. A distal end of a U-shaped adjustment handle 22 is fixed to the base end of the swing member 24, and the distal end of the swing member 24 is bent so as to face the numerous concave grooves 21a. A claw portion 24a that can be selectively inserted into the groove 21a is formed. The adjustment handle 22 is provided with a spring material 26 that urges the adjustment handle 22 to rotate the adjustment handle 22 in the direction in which the claw portion 24a at the tip of each swing member 24 is inserted into the groove 21a. Provided (FIG. 1).

  On the other hand, the moving member 19 is moved to the pair of lower rails so that the moving member 19 is moved backward with respect to the pair of lower rails 16a and 16b when an impact force of a predetermined value or more acts on the seat 13 from the front. Moving member fixing means 30 for fixing to 16a, 16b is provided. As shown in FIGS. 4 to 6, the moving member fixing means 30 in this embodiment includes a pair of locked members 31 respectively provided on the inner side of the pair of plate members 18 a and 18 b. The locked member 31 is provided along the longitudinal direction by raising the inside of a pair of plate members 18a, 18b provided between the pair of lower rails 16a, 16b and the floor 11a. A plurality of locked holes 31a are formed in the locked member 31 at predetermined intervals in the longitudinal direction of the pair of lower rails 16a and 16b (FIG. 5).

  Further, the moving member fixing means 30 in this embodiment includes a housing 32 provided on the moving member 19 between the pair of locked members 31 and a pair of locking provided protruding from both sides of the housing 32. The tool 33 is provided. The locking tool 33 includes a locking main body 33a configured to be locked in the locked hole 31a, and a rod-shaped member 33b provided with the locking main body 33a at the tip thereof. The base end of the rod-shaped member 33 b is provided so as to be immersible from both sides of the housing 32. The locking main body 33a at the protruding tip of the locking tool 33 provided so as to be immersible in the housing 32 is formed with a rear surface 33c inclined so that the locking tool 33 is engaged with the tip of the locking tool 33 being inserted into the locked hole 31a. It is formed so as to be in surface contact with the front surface of the stop hole 31a. The rod-shaped member 33b is provided with a coil spring 40 that urges the locking member 33 so that the tip of the locking member 33 protrudes (FIG. 2). The locking body 33a at the tip of the locking tool 33 is configured to be selectively locked in the locked hole 31a of the locked member 31 by the elastic force of the coil spring 40.

  Therefore, in this moving member fixing means 30, when a backward load is applied to the upper rail 17a, the load is transmitted to the moving member 19, and the pair of locking members 33 together with the moving member 19 tries to move backward together with the upper rail 17a. . Then, as shown in FIG. 9, the locking tool 33 is immersed in the housing 32 against the urging force of the coil spring 40 by the inclined rear surface of the locking body 33a contacting the rear surface of the locked hole 31a, As shown in FIG. 10, when the tool 33 moves rearward and the tip faces the next locked hole 31a behind the locked hole 31a where the tip of the locking tool 33 has been locked until now. It protrudes by the biasing force of the coil spring 40. And the front-end | tip of the latching tool 33 latches in the to-be-latched hole 31a. That is, the locked member 31 and the locking tool 33 are configured to prevent the upper rails 17a and 17b from moving forward while allowing the upper rails 17a and 17b to move backward.

  As shown in FIGS. 2 and 5-8, a sliding piece 35 is accommodated in the housing 32, and a gas receiving plate 35b is connected to the sliding piece 35 via a support shaft 35a. The The sliding piece 35 is disengaged from the first position 36 shown in FIG. 6 between the base ends of the pair of locking tools 33, 33 and the base end of the locking tool 33 behind the first position 36. The housing 32 is accommodated in the housing 32 so as to be movable between the second position 37 shown in FIG. The sliding piece 35 prohibits the proximal end of the pair of locking members 33 and 33 from entering the housing 32 at the first position 36, and the proximal end of the pair of locking members 33 and 33 at the second position 37. Is configured to allow immersion in the housing 32.

  Further, a piece receiving member 38 is accommodated in the housing 32, and a maintenance spring 39 for urging the piece receiving member 38 is further provided in a state accommodated in the case 39a. The piece receiving member 38 is accommodated in the housing 32 between the first position 36 and the second position 37, and the piece receiving member 38 is provided so as to be able to be immersed in a direction perpendicular to the moving direction of the sliding piece 35. The maintenance spring 39 is provided so as to extend in the direction in which the piece receiving member 38 is inserted and is accommodated in the case 39a. The maintenance spring 39 is configured to bias the piece receiving member 38 so as to protrude and maintain the sliding piece 35 at the first position 36 or the second position 37. Here, reference numeral 32 a is an exhaust hole for discharging the air inside the housing 32 to the outside when the sliding piece 35 moves from the first position 36 to the second position 37.

  The housing 32 is provided with driving means 41 for moving the sliding piece 35 from the first position 36 to the second position 37. The driving means 41 in this embodiment is a gas generator that moves the sliding piece 35 from the first position 36 to the second position 37 by the generated gas. The driving means 41 is provided at the front end of the housing 32. . As shown in detail in FIG. 6, the gas generator as the driving means 41 has been conventionally used for deploying the airbag 45 (FIG. 11), and in response to a command from the controller 43 described later. An ignition device 41a that ignites is provided on the base 41b, and a cover 41c is provided on the base 41b so as to cover the ignition device 41a. The cover 41c is filled with a gas generating agent 41d. When the ignition device 41a ignites, nitrogen gas is generated from the gas generating agent 41d. The cover 41c is ruptured, and the sliding piece 35 is moved to the first position by the pressure of the gas. It is configured to move from 36 to the second position 37. The rear portion of the housing 32 is formed with a gas vent hole 32b through which the gas generated by the driving means 41 is discharged to the outside after the sliding piece 35 has moved to the second position 37.

On the other hand, the truck 10 that is a vehicle is provided with an impact force sensor 42 that detects an impact force acting on the truck 10 from the front. As shown in FIG. 6, the impact force sensor in this embodiment uses an acceleration sensor 42 that has been conventionally used in a deployment device for an airbag 45 (FIG. 11). As shown in FIG. 11, the air bag 45 is attached to the side portion of the steering column 12 that holds the steering shaft 12a facing the seat 13 via the gas generator 45a having the same structure as the driving means 41 described above. The vessel 45a is configured to be able to introduce nitrogen gas into the airbag 45. The acceleration sensor 42 is provided on the bumper 10 a of the truck 10, which is a vehicle, or a vehicle body near the bumper 10 a, and the detection output of the acceleration sensor 42 is connected to the control input of the controller 43. The control output of the controller 43 is connected to a gas generator 45a in the airbag 45 and a gas generator 41 as driving means. The controller 43 is provided with a memory 43a. The memory 43a stores a load acting when the track 10 collides with the front as a threshold value. When the detection output of the acceleration sensor 42 exceeds this threshold value, the controller 43 recognizes that the truck 10 has collided with the front and controls the gas generator 45a to introduce nitrogen gas into the airbag 45. At the same time, the gas generator 41 as the driving means is controlled so as to move the sliding piece 35 from the first position 36 to the second position 37.
Returning to FIG. 11, the steering column 12 is supported by a dash panel 46 in front of the seat 13 via a column support bracket 47, and a steering wheel 48 is fixed to a steering shaft protruding from the upper end of the steering column 12.

The operation of the vehicle seat configured as described above will be described.
The driver who drives the truck 10 for the first time needs to move the seat 13 in the front-rear direction and fix it at any optimum position according to his / her preference. This fixing is performed by the sheet fixing means 20, and as shown in FIG. 3, the swinging member 24 is swung by lifting the adjustment handle 22, and its tip is detached from the recessed groove 21 a in the grooved plate 21. As a result, the upper rails 17a and 17b can move in the front-rear direction along the lower rails 16a and 16b independently of the moving member 19, and the adjustment handle 22 is lowered downward according to the urging force of the spring material 26 at the optimum position. Then, as shown in FIG. 1, the claw portion 24a at the tip of the swinging member 24 is inserted into the concave groove 21a, and the movement of the upper rails 17a, 17b relative to the moving member 19 is prohibited. On the other hand, as shown in FIG. 4, since the locked member 31 and the locking tool 33 are in a state of being engaged with each other, the movement of the moving member 19 in the front-rear direction is prohibited. With the claw portion 24a at the front end inserted into the groove 21a, the seat 13 is fixed at an arbitrary position desired by the driver.

  Here, in this vehicle seat, both ends of the moving member 19 are superposed on a pair of plate members 18a and 18b provided on the lower rails 16a and 16b, and the moving member 19 is connected to the pair of lower rails 16a and 16b via the locking pins 14. Since the seat fixing means 20 and the moving member fixing means 30 are provided for the moving member 19, the upper rails 17a and 17b can be directly attached to the lower rails 16a and 16b. Then, by attaching the upper rails 17a and 17b directly to the lower rails 16a and 16b, the mounting position of the seat 13 with respect to the floor 11a as compared with the conventional mounting structure in which the upper rail and the lower rail are mounted via the first and second auxiliary rails. Can be reduced. Since the swing member 24 is inserted between the grooved plate 21 and the upper rails 17a and 17b, the seat fixing means 20 can be attached without changing the attachment position of the seat 13 with respect to the floor 11a.

  After the seat 13 is fixed at a desired position, the driver sits on the seat 13 and drives the truck to run. When the truck 10 normally travels, an inertial force associated with traveling acts on the seat 13. Since this inertial force is not a shock load, the detection output of the acceleration sensor 42, which is an impact force sensor, does not exceed the threshold value stored in the memory 43a. Located at position 36. On the other hand, when the truck 10 collides with the front, a shocking and large forward load is applied to the seat 13 (range (a) in FIG. 12). Then, the detection output of the acceleration sensor 42, which is an impact force sensor, exceeds the threshold value stored in the memory, and the controller 43 recognizes that the track 10 has collided with the front and controls the gas generator 45a. The airbag 45 is inflated to prevent the driver from tilting forward and coming into direct contact with the steering wheel 48. At the same time, the controller 43 controls the driving means 41 to move the sliding piece 35 from the first position 36 to the second position 37 as shown in FIGS. This allows the locking tool 33 to be immersed, but prevents the upper rails 17a and 17b from moving forward by the locked member 31 and the locking tool 33.

  Thereafter, the forward load acting on the seat 13 decreases and shifts to the range shown in FIG. 12 (b), and then the steering column 12 moves backward to contact the seat cushion 13a or the airbag 45 is inflated. Thus, a backward load acts on the seat 13 (range (c) in FIG. 12). However, since the load is not a shocking load, the maintenance spring 39 maintains the sliding piece 35 at the second position 37 and the sliding piece returns to the first position 36 and prohibits the locking tool 33 from being inserted. Absent. When a rearward load is applied to the seat 13 due to the inflation of the airbag 45, the locked member 31 tries to move rearward together with the upper rail 17a. As shown in FIGS. The locking tool 33 is immersed in the housing 32 against the urging force of the coil spring 40 by the inclined rear surface of the locking main body 33a contacting the rear surface of 31a. Then, the pair of locking members 33 and 33 move rearward together with the moving member 19 and the upper rail 17a, and the upper rails 17a and 17b move backward along with the seat 13 along the lower rails 16a and 16b. As a result, the seat 13 can be reliably retracted at the time of a frontal collision of the truck 10, and the occupant's ability to escape the seat 13 can be improved. Further, as shown in FIG. 10, as the upper rails 17a, 17b are retracted together with the seat 13, the pair of locking tools 33, 33 are sequentially locked in the rear locked holes 31a, so that the upper rails 17a, 17b Even if a forward load is applied to the seat 13 again, the seat 13 does not advance even if the seat 13 is held in the retracted position.

  On the other hand, when the vehicle 10 is collided from behind, a backward load is applied to the driver's seat 13. Since this load is not a shocking and large forward load, the detection output of the acceleration sensor 42 does not exceed the threshold value stored in the memory 43a. For this reason, the controller 43 does not recognize that a frontal collision has occurred. Therefore, the sliding piece 35 is located at the first position 36 and maintains the pair of locking members 33 and 33 in a state in which they cannot be immersed. As a result, the backward movement of the seat 13 is prohibited when the vehicle 10 is collided from behind without causing a frontal collision. In this embodiment, since the acceleration sensor 42 used in the airbag 45 deployment device is used as the impact force sensor, the number of parts is reduced as compared with the case where the impact force sensor 42 is provided independently, and the unit price thereof is reduced. Can be prevented from being pushed up. Further, since the driving means 41 is a gas generator conventionally used for deploying the airbag 45, it is possible to prevent the unit price from being pushed up by reducing the type of parts and reducing the management burden. .

In this embodiment, an example has been described in which the acceleration sensor 42 conventionally used in the deployment device for the airbag 45 (FIG. 11) provided on the bumper 10a or the vehicle body near the bumper 10a is used as an impact force sensor. However, the impact force sensor may be a touch sensor, a sensor using an optical fiber, a pressure sensor using a piezo element, or an ultrasonic sensor as long as the impact force acting on the vehicle 10 from the front can be detected.
Here, the touch sensor is a sensor configured to be able to detect an impact force acting on the vehicle 10 from the front by mechanical contact. The sensor using an optical fiber is an optical fiber that functions as a sensor by embedding an analysis element (FBG: Fiber Bragg Grating) in which the frequency of reflected light changes due to distortion or heat in the core of the optical fiber. It has been made. That is, when an optical fiber embedded with an analysis element is touched, the optical fiber is distorted, and the wavelength also changes due to the distortion. The signal processing apparatus connected to the optical fiber recognizes the change in wavelength, and the optical fiber It is possible to recognize the fact that another member or the like is in contact. When a touch sensor or a sensor using an optical fiber is used as an impact force sensor, the shape of the sensor is a belt-like shape. Therefore, as shown in FIG. 13, the bumper 10a or the panel 10b above the bumper 10a It is preferable that the touch sensor and the optical fiber 51 are provided so as to extend in the width direction of the vehicle 10. When the touch sensor and the optical fiber 51 are provided so as to extend in the width direction as described above, it is possible to detect an impact force acting on all the positions in the width direction of the front portion of the vehicle 10.

  An ultrasonic sensor is a sensor configured to detect the presence or absence of an object by emitting an ultrasonic wave and receiving a reflected wave thereof. When this ultrasonic sensor is used as an impact force sensor, they can detect the presence or absence of an object in a certain range, so as shown in FIG. 15, the bumper 10a or the panel 10b above the bumper 10a is detected. A plurality of ultrasonic sensors 53 are preferably provided at predetermined intervals in the width direction of the vehicle 10. When a plurality of ultrasonic sensors 53 are provided in this way, a wide range of objects can be detected. The ultrasonic sensor 53 and the other sensors 42, 51, 52 may be provided in combination.

  Further, in this embodiment, the sheet fixing means 20 including the grooved plate 21 and the swing member 24 has been described. However, the sheet fixing means is not limited to this, and the sheet fixing means as shown in FIGS. 16 and 17 is used. 60 may be sufficient. The seat fixing means 60 includes a holed plate 61 provided in the moving member 19 and a pair of rotary handles 62a and 62b attached to the upper rails 17a and 17b along the longitudinal direction of the upper rails 17a and 17b. The perforated plate 61 is provided along the lower rails 16a and 16b on both sides of the moving member 19, and a plurality of square holes 61a are formed along the longitudinal direction of the rails 16a and 16b. Further, the base end of the handle holder 63 is fixed to the upper surfaces of the upper rails 17a and 17b, respectively, and the distal end of the handle holder 63 is located between the holed plate 61 and the upper rails 17a and 17b, and a round hole 63a is formed at the distal end. Is done. Rotating handles 62a and 62b are inserted between the perforated plate 61 and the upper rails 17a and 17b, respectively. The rotating handles 62a and 62b are rotatably inserted into the round holes 63a and can be rotated about the axis. Configured. A claw member 64 is inserted between the perforated plate 61 and the upper rails 17a and 17b, and the base ends of the claw member 64 are fixed to the pair of rotary handles 62a and 62b, respectively. The tips of the claw members 64 whose base ends are fixed to the pair of rotary handles 62a and 62b are bent so as to be selectively inserted into the plurality of square holes 61a. A pair of rotary handles 62a and 62b respectively provided on the upper rails 17a and 17b via the holder 63 are connected to each other via a connecting member 67 and a connecting wire 68 provided at their front ends, and one rotary handle 62a includes The torsion coil springs 66 that rotate the respective rotating handles 62a and 62b in the direction in which the rotating handles 62a are urged to insert the tips of the respective claw members 64 into the square holes 61a are wound (FIG. 16).

  The sheet 13 is fixed by the sheet fixing means 60 by rotating the pair of rotary handles 62a and 62b together with the claw member 24 as shown by the solid line arrow in FIG. 16, and the tip of the claw member 24 having a hole as shown in FIG. The plate 61 is separated from the square hole 61a. As a result, the upper rails 17a and 17b can move in the front-rear direction along the lower rails 16a and 16b independently of the moving member 19, and the pair of rotary handles 62a and 62b are moved according to the biasing force of the coil spring 66 at the optimum position. Rotate as shown by the dashed arrows in FIG. As a result, the tip of the claw member 64 is inserted into the square hole 61a as shown in FIG. On the other hand, since the locked member 31 and the locking tool 33 are engaged with each other, the movement of the moving member 19 in the front-rear direction is prohibited, and the tip of the claw member 64 is inserted into the square hole 61a. In this state, the seat 13 is fixed at an arbitrary position desired by the driver. Since the pair of rotary handles 62a and 62b are inserted between the perforated plate 61 and the upper rails 17a and 17b, the seat fixing means 60 can be attached without changing the attachment position of the seat 13 with respect to the floor 11a. .

In the above-described embodiment, the case where the long holes 19a are formed on both sides of the moving member 19 and the locking pins 14 are fixed to the pair of plate members 18a and 18b has been described. However, the moving member 19 is a pair of lower rails. As long as it is movable in the front-rear direction with respect to 16a, 16b, a long slot is formed in the pair of plate members 18a, 18b in the front-rear direction, and the locking pin 14 is opposed to the slot on both sides of the moving member 19. The locking pin 14 may be inserted and engaged with the long hole.
In this embodiment, the case where the driving means 41 for moving the sliding piece 35 from the first position 36 to the second position 37 is a gas generator has been described. The motor may be configured to be movable from the first position 36 to the second position 37, or may be a magnetic force generator that moves the sliding piece 35 from the first position 36 to the second position 37 by a magnetic force. . Further, the driving means sprays compressed air from the air tank onto the sliding piece 35 to move the sliding piece 35 from the first position 36 to the second position 37, an air tank, and its injection An air blowing device including an on-off valve provided in an air flow path between the nozzles may be used.

Moreover, in this embodiment, although the coil spring 40 which makes the front-end | tip protrude the locking tool 33 was shown in the rod-shaped member 33b, the front-end | tip protrudes the locking tool 33 with the pressure or hydraulic pressure of gas. It may be energized as follows.
In this embodiment, a cab-over type truck is used as the vehicle. However, a passenger car or other vehicle may be used.
Further, in this embodiment, the driver's seat is used as the seat, but a passenger seat or other seats may be used.

The perspective view which shows the vehicle seat of this invention. AA line sectional view of FIG. The perspective view corresponding to FIG. 1 which shows the structure of the sheet | seat fixing means. The perspective view corresponding to FIG. 1 which shows the structure of the moving member fixing means. BB sectional view of FIG. CC sectional view of FIG. Sectional drawing corresponding to FIG. 5 which shows the state which the sliding piece moved to the 2nd position from the 1st position. DD sectional view of FIG. Sectional drawing corresponding to FIG. 5 which shows the state which the latching tool began to immerse in a housing. Sectional drawing corresponding to FIG. 5 which shows the state which the latching tool latched in the following to-be-latched hole. The cross-sectional block diagram of the cab of the track | truck containing the sheet | seat which shows the state before front collision. The figure which shows the change of the load which acts on a sheet | seat when the track | truck collides with the front. FIG. 3 is a perspective view of a cab in which a belt-like sensor is provided on the back side of the bumper so as to extend in the width direction. The perspective view of the cab by which the pressure sensor was provided in the back side of the bumper at predetermined intervals. The perspective view of the cab by which the ultrasonic sensor was provided in the bumper at predetermined intervals. The perspective view corresponding to FIG. 3 which shows the structure of another sheet | seat fixing means of this invention. Sectional drawing corresponding to FIG. 2 which shows the cross-sectional structure of the another sheet | seat fixing means. Sectional drawing corresponding to FIG. 17 which shows the state which the front-end | tip of the nail | claw member of the another sheet | seat fixing means removed from the plate with a hole. The block diagram which shows the conventional vehicle seat.

Explanation of symbols

10 Truck (vehicle)
11a Floor 13 Seat 13a Seat cushion 16a, 16b Lower rail 17a, 17b Upper rail 18a, 18b Plate 19 Moving member 20, 60 Seat fixing means 30 Moving member fixing means 31 Locked member 32 Housing 33 Locking tool 35 Sliding piece 36 1 position 37 2nd position 41 Gas generator (drive means)
42 Acceleration sensor (impact force sensor)

Claims (2)

A pair of lower rails (16a, 16b) and a pair of lower rails (16a, 16b) disposed on the floor (11a) so as to extend in the traveling direction of the vehicle (10) at a predetermined interval in the vehicle width direction. A pair of upper rails (17a, 17b) fixed to the seat cushion (13a) of the seat (13) so as to face each other and attached to the pair of lower rails (16a, 16b) so as to be movable in the front-rear direction, and the pair A movable member (19) attached to the lower rail (16a, 16b) so as to be movable in the front-rear direction, and the pair of lower rails (16a, 16a, 16b) when an impact force of a predetermined value or more acts on the seat (13) from the front. 16b) moving member fixing means (30) for fixing the moving member (19) to the pair of lower rails (16a, 16b) so as to retract the moving member (19), and the pair of upper rails (17a) 17b) is configured to selectively fix the moving member (19) at an arbitrary position in the front-rear direction. In the vehicle seat that includes a locking means (20, 60),
The pair of lower rails (16a, 16b) is provided with a pair of plate members (18a, 18b) that overlap on both sides of the moving member (19),
The moving member (19) is attached to the pair of plate members (18a, 18b) so as to be movable in the front-rear direction,
The moving member fixing means (30)
A pair of locked members (31, 31) respectively provided on the inner side of the pair of plate members (18a, 18b);
A housing (32) provided on the moving member (19) between the pair of locked members (31, 31);
The housing (32) is provided with a pair of base ends projecting from both sides so as to be retractable laterally, and a projecting tip is configured to be able to be locked to the pair of locked members (31, 31). Locking device (33,33),
The pair of latches (33, 33) is prevented from being immersed in a first position (36) between the pair of latches (33, 33) housed in the housing (32). A sliding piece (35) that allows the pair of locking tools (33, 33) to be immersed in a second position (37) inside the housing (32) that is separated from between the tools (33, 33);
An impact force sensor (42) for detecting an impact force acting on the vehicle (10) from the front;
Drive means (41) for moving the sliding piece (35) from the first position (36) to the second position (37) when the impact force sensor (42) detects an impact force of a predetermined value or more; A vehicle seat characterized by comprising: The impact force sensor (42) is an acceleration sensor used in the deployment device of the airbag (45), and the sliding piece (35) is moved from the first position (36) by the gas generated by the drive means (41). The vehicle seat according to claim 1, wherein the vehicle seat is a gas generator moved to the second position (37).

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