JP4115415B2 - Seat lock release device for vehicle seat - Google Patents

Description

  The present invention relates to a seat lock releasing device for a vehicle seat that includes a fixing means for fixing a vehicle seat at an arbitrary position and is configured to release and retract the seat lock of the seat at the time of a frontal collision of the vehicle. It is.

  Conventionally, as a seat lock release device for a vehicle seat, as shown in FIG. 11, a lower rail 3 is disposed on a floor 2 so as to extend in the traveling direction of the vehicle, and an upper rail is provided on a seat cushion 4 a so as to face the lower rail 3. 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 6 and fixing the seat 4 at an arbitrary position and a retracting means 8 for retracting the seat 4 in the event of a frontal collision. Is known (see, for example, 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. Attached plate is attached, and adjustment handle 7c is attached to upper rail 6 so as to be rotatable along the longitudinal direction of upper rail 6 and about the center of rotation, so that the tip can be selectively inserted into a plurality of square holes of the plate with holes. A coil spring that rotates the adjustment handle 7c in a direction in which the proximal end of the configured claw member is fixed to the adjustment handle 7c and the distal end of the claw member is inserted into the square hole is disclosed around the adjustment handle 7c. Has been. With this seat fixing means, the seat 4 can be fixed at an arbitrary position in the front-rear direction of the vehicle by changing the square hole into which the tip of the claw member is inserted.

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

However, in the conventional seat lock release device for a vehicle seat, the upper rail 6 and the lower rail 3 are attached via the first and second auxiliary rails 7a and 8a, so that the structure thereof is complicated.
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.
SUMMARY OF THE INVENTION An object of the present invention is to provide a seat lock release device for 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 the vehicle is collided from behind.

As shown in FIGS. 1 to 4 and 9, the invention according to claim 1 includes a pair of lower rails 16a and 16b disposed on the floor 11a so as to extend in the traveling direction of the vehicle 10, and a pair of lower rails 16a, A pair of lower rails 16a and 16b, which is connected to the pair of lower rails 16b and 16b, is fixed to the seat cushion 13a of the seat 13 so as to face the pair of lower rails 16a and 16b. The pair of upper rails 17a and 17b, which are respectively attached to the lower rails 16a and 16b or the movable member 14 so as to be movable in the front-rear direction, and the pair of upper rails 17a and 17b are selectively fixed at arbitrary positions in the front-rear direction of the movable member 14. This is a seat lock release device for a vehicle seat provided with a seat fixing means 20.
The characteristic configuration is provided on the pair of locked members 31 and 31 provided on the inner side of the pair of lower rails 16a and 16b, and on the moving member 14 between the pair of locked members 31 and 31, respectively. A housing 32 and a pair of engagement members each having a base end projecting from the both sides so as to be immersible and projecting to the side, and a projecting tip is configured to be able to be engaged with the pair of members to be locked 31, 31 The pair of engaging members 33 and 33 are prohibited from being inserted at a first position 36 between the stoppers 33 and 33 and movably accommodated in the housing 32 and between the base ends of the pair of engaging members 33 and 33. The sliding piece 35 that allows the pair of locking tools 33 and 33 to be immersed at the second position 37 that is disengaged from the base ends of the stoppers 33 and 33, and the sliding piece 35 from the first position 36 to the second position 37. Driving means 41 to be moved and load acting on the seat 13 A load sensor 42 for detecting, there is to provided with a controller 43 for controlling the driving means 41 based on the detection output of the load sensor 42.

  In the seat lock release device for a vehicle seat described in claim 1, the moving member 14 is attached to the lower rails 16 a and 16 b, and the seat fixing means 20 and the seat retracting means 30 are configured with respect to the moving member 14. The upper rails 17a and 17b can be directly attached to the lower rails 16a and 16b. Further, by directly attaching the upper rails 17a and 17b to the lower rails 16a and 16b, the structure can be simplified as compared with the conventional mounting structure in which the upper rail and the lower rail are attached via the first and second auxiliary rails. it can.

Further, in this seat lock release device for a vehicle seat, when the vehicle 10 collides with the front, the controller 43 recognizes that the front collision has occurred based on the detection output of the load sensor 42 and controls the driving means 41 to control the sliding piece 35. The first position 36 is moved to the second position 37. Accordingly, the pair of locking tools 33 and 33 are allowed to be immersed in the housing 32. When the pair of locking tools 33 and 33 are immersed, the pair of locking tools 33 and 33 and the locked member 31, The locked state with 31 is released. Then, since the upper rails 17a and 17b can move rearward with respect to the lower rails 16a and 16b, the upper rails 17a and 17b move backward together with the seat 13 due to the intrusion of the front surface of the vehicle 10 into the passenger compartment or the inflation of the airbag.
On the other hand, even if the vehicle 10 is collided from behind, the controller 43 does not recognize that the front collision has occurred due to the detection output of the load sensor 42. 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 load sensor 42 is a sensor used in a deployment device of the airbag 45, and the sliding piece 35 is moved by the gas generated by the driving means 41. The gas generator is moved from the first position 36 to the second position 37.
In the seat lock release device for a vehicle seat according to the second aspect, since the load sensor 42 is a sensor used in the deployment device of the airbag 45, the parts are compared with the case where the load sensor 42 is provided independently. The score can be reduced. Further, if 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 increased due to a decrease in the number of parts and a reduction in management burden. .

The invention according to claim 3 is the invention according to claim 1 or 2, wherein the sliding piece 35 moves to the outer cylinder 35a and the outer cylinder 35a in the traveling direction of the vehicle 10, as shown in FIGS. A holding spring 39 is provided on the housing 32 for biasing the sliding piece 35 to be maintained at the first position 36 or the second position 37, and the holding spring 39 is slid. The internal member 35b returns from the second position 37 to the first position 36 when the rearward load acting on the seat 13 in the state where the moving piece 35 is maintained at the second position 37 becomes a predetermined impact or more, and a pair of engagements. It is characterized by being configured to prohibit immersion of the stoppers 33, 33.
In the seat lock release device for a vehicle seat described in claim 3, the vehicle 10 collides with the front and the seat 13 moves backward, and the locking tool 33 is locked to the locked portion 31a behind the original. In this state, when another vehicle collides with the vehicle 10 from the rear, the internal member 35b of the sliding piece 35 returns from the second position 37 to the first position 36 and prohibits the pair of locking members 33, 33 from being immersed. . As a result, it is possible to inhibit the seat 13 from retreating when the vehicle 10 is further bumped from behind.

The invention according to claim 4 is the invention according to any one of claims 1 to 3, and as shown in FIGS. 1 and 3, the pair of locking members 33, 33 has a load acting on the seat 13. The housing 32 is provided with a base end that is not immersible in the forward direction and a load acting on the seat 13 so that the base end is immersible when the load is applied rearward. A pair of coil springs 40 for urging the pair of locking members 33 and 33 so as to project the respective tips of the pair of coil springs 40 are provided. It is characterized by being adjusted so as to allow the locking tools 33, 33 to be immersed.
In the vehicle seat lock release device according to the fourth aspect, even when a forward load or a forward acceleration is applied to the seat 13, the upper rails 17 a and 17 b can be prevented from moving forward together with the seat 13. Further, since the coil spring 40 is provided, the pair of locking members 33 and 33 are not immersed in the housing 32 during normal traveling, and the seat 13 can be prevented from moving backward during normal traveling.

The invention according to claim 5 is the invention according to any one of claims 1 to 4, wherein the sheet fixing means 20 is provided in the moving member 14 and has a plurality of square holes along the longitudinal direction of the upper rails 17 a and 17 b. A base plate 21 having a hole 21a, an adjustment handle 22 attached to the upper rails 17a and 17b so as to be rotatable along the longitudinal direction of the upper rails 17a and 17b and having an axis as a rotation center; A claw member 24 having an end fixed and a tip that can be selectively inserted into the plurality of square holes 21a, and an adjustment handle 22 wound around the adjustment handle 22 so that the tip of the claw member 24 is inserted into the square hole 21a. And a torsion coil spring 26 that urges the rotor to rotate.
In the seat lock release device for a vehicle seat according to claim 5, the adjustment handle 22 is rotated together with the claw member 24 to disengage the tip from the square hole 21 a in the holed plate 21, and the seat 13 is moved. The adjustment handle 22 is rotated in the reverse direction in accordance with the biasing force of the coil spring 26 at the optimum position, and the tip of the claw member 24 is inserted into the square hole 21a, so that the seat 13 can be easily and arbitrarily selected by the driver. Can be fixed in position.

In the seat lock release device for a vehicle seat according to the present invention, it is possible to attach the upper rail directly to the lower rail by attaching the moving member to the lower rail and configuring the seat fixing means and the seat retracting means to the moving member. . Then, by directly attaching the upper rail to the lower rail, the structure can be simplified as compared with the conventional attachment structure in which the upper rail and the lower rail are attached via the first and second auxiliary rails.
In addition, a housing is provided on a moving member between a pair of locked members respectively provided on the inner side portions of the pair of lower rails, and a pair of locking tools are provided on the housing so that the respective base ends can be immersed from both sides. , The first position between the base ends of the pair of locking tools prohibits the immersion of the pair of locking tools, and the second position deviates from the base ends of the pair of locking tools. The sliding piece to be permitted, the driving means for moving the sliding piece from the first position to the second position, the load sensor for detecting the load acting on the seat, and the driving means are controlled based on the detection output of the sensor. When the vehicle collides with the front, the controller recognizes that the front has collided with the detection output of the load sensor, controls the driving means, and moves the sliding piece to the second position. As a result, the pair of locking devices are allowed to be immersed in the housing, and the locking state between the pair of locking devices and the locked member is released by the immersion of the pair of locking devices. The seat can be retracted by entering the front passenger compartment or by inflating an airbag or the like.

In this case, if the load sensor is a sensor used in an airbag deployment device, the load sensor is shared with the sensor used in the airbag deployment device. The score can be reduced. In addition, 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 gas generator that has been conventionally used for deploying the airbag is used. Therefore, it is possible to prevent the unit price from being increased due to the decrease in the number of parts and the management burden.
Further, the sliding piece has an outer cylinder and an inner member inserted into the outer cylinder so as to be movable in the vehicle traveling direction, and maintains the sliding piece to be maintained at the first position or the second position. A spring is provided in the housing, and the internal member is moved from the second position to the first position when the backward load acting on the seat exceeds the predetermined impact value with the maintaining spring maintaining the sliding piece in the second position. If it is configured to return and prohibit the immersion of the pair of locking tools, the vehicle will collide with the front and the driver's seat will retreat, and the locking tool is locked to the locked portion behind the original, Even if another vehicle collides with the vehicle from the rear, the internal member of the sliding piece returns from the second position to the first position and prohibits the immersion of the pair of locking devices. The seat can be prevented from retreating in the event of an accident.

Next, the best mode for carrying out the present invention will be described with reference to the drawings.
As shown in FIG. 9, 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 at the lower portion of the seat cushion 13a (FIG. 3). 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, and 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. The lower rails 16a and 16b are attached to the floor 11a via seat legs 18 and seat brackets 19.

  As shown in FIGS. 3 and 4, the pair of upper rails 17a, 17b has substantially the same length as the pair of lower rails 16a, 16b, and the pair of upper rails 17a, 17b is respectively the pair of lower rails 16a, 16b. It is attached to the outside so as to be movable along its longitudinal direction. Although not shown, a roller accommodating portion is formed between the upper rails 17a and 17b and the lower rails 16a and 16b, and rollers are accommodated in the accommodating portions, respectively. A forward stopper (not shown) and a backward stopper (not shown) for determining the most advanced position and the most retracted position of the upper rails 17a, 17b are provided at the front and rear ends of the roller rolling surfaces of the lower rails 16a, 16b. Each projectes.

  The moving member 14 is attached to the pair of lower rails 16a and 16b so as to be movable in the front-rear direction. The moving member 14 in this embodiment includes a pair of auxiliary rails 14a and 14b attached to the inner sides of the pair of lower rails 16a and 16b along the longitudinal direction thereof, and the pair of auxiliary rails 14a and 14b. And a connecting plate 14c for connecting the two. The pair of auxiliary rails 14a and 14b are formed shorter than the length of the lower rails 16a and 16b, and the moving member 14 including the auxiliary rails 14a and 14b is disposed between the pair of lower rails 16a and 16b and the front ends of the pair of lower rails 16a and 16b. It is mounted so as to be movable in the front-rear direction within a range between the rear end and the rear end. On the other hand, the pair of upper rails 17a and 17b are attached to the pair of lower rails 16a and 16b from the front and rear ends of the pair of upper rails 17a and 17b, respectively, such that the moving member 14 cannot protrude forward or backward. A pair of upper rails 17 a and 17 b is provided with a sheet fixing means 20 that selectively fixes the upper and lower rails 17 a and 17 b to arbitrary positions in the front and rear direction of the moving member 14.

  The seat fixing means 20 in this embodiment includes a plate 21 with a hole provided in the moving member 14 and an adjustment handle 22 attached to the upper rails 17a and 17b along the longitudinal direction of the upper rails 17a and 17b. The plate 21 with holes is provided along the lower rails 16a and 16b on both sides of the moving member 14, and a plurality of square holes 21a are formed along the longitudinal direction of the rails 16a and 16b. Further, the base end of the handle holder 23 is fixed to the upper surfaces of the upper rails 17a and 17b, and a circular hole 23a is formed at the tip of the handle holder 23. The circular hole 23a is configured such that the adjustment handle 22 is rotatably inserted and is rotatable about its axis. A base end of a claw member 24 is fixed to the adjustment handle 22, and a tip end of the claw member 24 is bent so as to be selectively inserted into the plurality of square holes 21a. The adjustment handles 22 provided on the upper surfaces of the upper rails 17a and 17b are connected to each other via a connecting member 27 and a connecting wire 28 provided at the rear ends of the upper rails 17a and 17b. The torsion coil springs 26 that urge and rotate the respective adjustment handles 22 in the direction in which the tips of the respective claw members 24 are inserted into the square holes 21a are wound (FIG. 4).

  On the other hand, the moving member 14 is provided with a seat retracting means 30 for retracting the moving member 14 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. As shown in FIGS. 1 to 4, the seat retraction means 30 in this embodiment includes a pair of locked members 31 provided on the inner side of the pair of lower rails 16 a and 16 b and a pair of locked members. And a housing 32 provided on the moving member 14 between 31. The locked member 31 is provided along the longitudinal direction on the inner side of the pair of lower rails 16a and 16b. A plurality of locked portions 31a are formed on the locked member 31 at predetermined intervals in the longitudinal direction of the pair of lower rails 16a and 16b (FIG. 1). The locked portion 31a is a serrated recess formed inside the locked member 31, and the front surface 31b of the locked portion 31a is formed as an upright surface extending substantially in the vehicle width direction, and the rear surface 31c. Is formed on an inclined surface that gently climbs toward the rear.

  On the other hand, the housing 32 is provided with a pair of locking members 33 from both sides. The locking tool 33 includes a locking main body 33a configured to be locked to the locked portion 31a, and a bar-shaped member 33b provided with the locking main body 33a at the front end. 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 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 (FIG. 1), and the tip of the locking member 31a enters the locked portion 31a. It is formed so as to be in surface contact with the front surface 31c of the locked portion 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. The locking body 33a at the distal end of the locking tool 33 is configured to be selectively locked to the locked portion 31a of the locked member 31 by the elastic force of the coil spring 40.

  Accordingly, in the seat retracting means 30, when a backward load is applied to the upper rail 17a, the load is transmitted to the moving member 14, and the pair of locking members 33 together with the moving member 14 tends to move backward together with the upper rail 17a. Then, as shown in FIG. 5, the locking member 33 is immersed in the housing 32 against the biasing force of the coil spring 40 by the inclined rear surface 31c of the locked portion 31a, and the locking device 33 moves rearward. As shown in FIG. 7, the front end of the locking tool 33 protrudes by the biasing force of the coil spring 40 when the front end faces the next locked portion 31a behind the locked portion 31a locked until now. To do. And the front-end | tip of the latching tool 33 latches to the to-be-latched part 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. 1 to 3, a sliding piece 35 is provided inside the housing 32. The sliding piece 35 in this embodiment has an outer cylinder 35a and an inner member 35b inserted into the outer cylinder 35a so as to be movable in the traveling direction of the vehicle 10. The sliding piece 35 is disengaged from the first position 36 shown in FIG. 2 between the base ends of the pair of locking tools 33, 33 and the base end of the locking tool 33 in front of the first position 36. A second position 37 shown in FIG. 6 inside the housing 32 is movably accommodated in the housing 32. Further, a piece receiving member 38 made of a metal ball is accommodated in the housing 32, and a maintenance spring 39 for biasing the piece receiving member 38 is provided in the housing 32 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 maintenance spring 39 is provided in a state of being accommodated in the case 39a in a direction perpendicular to the moving direction of the sliding piece 35. The piece receiving member 38 is provided so that it can be immersed in the case 39a when the sliding piece 35 is moved. 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 shown in FIG. 2 or the second position 37 shown in FIG.

  As shown in FIG. 1, 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 rear end of the housing 32. It is done. As shown in detail in FIG. 2, the gas generator as the driving means 41 has been conventionally used for deploying the airbag 45 (FIG. 9), and is based on 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 upper portion of the housing 32 is formed with a vent hole 32a for discharging the gas generated by the sustain driving means 41 after the sliding piece 35 has moved to the second position 37. A guide hole 32b for guiding the internal member 35b in the sliding piece 35 is formed.

The load acting on the seat 13 is detected by a load sensor 42 (FIG. 1). As shown in FIG. 9, the load sensor 42 in this embodiment is the same as that used in the airbag 45 deployment device. The air bag 45 is attached to the side of the steering column 12 that holds the steering shaft 12 a facing the seat 13 via the gas generator 45 a having the same structure as the driving means 41 described above. Nitrogen gas can be introduced inside. The load sensor 42 is a resistance strain meter provided in the housing 32, and the detection output of the load sensor 42 is connected to the control input of the controller 43. The control output of the controller 43 is connected to the gas generator 45a and the driving means 41. The controller 43 is provided with a memory 43a. The memory 43a stores a load acting on the housing 32 as a threshold when the track 10 collides with the front. When the detection output of the load sensor 42 exceeds this threshold, 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 driving means 41 is controlled to move the sliding piece 35 from the first position 36 to the second position 37.
Returning to FIG. 9, 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 seat lock releasing device for a 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 the adjustment handle 22 is rotated together with the claw member 24 to disengage the tip from the square hole 21 a in the holed 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 14, and the adjustment handle 22 is rotated according to the urging force of the coil spring 26 at an optimum position. As a result, the tip of the claw member 24 is inserted into the square hole 21a, and movement in the front-rear direction with respect to the moving member 14 is prohibited. 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 14 in the front-rear direction is prohibited, and the tip of the claw member 24 is inserted into the square hole 21a. In this state, the seat 13 is fixed at an arbitrary position desired by the driver.

  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 an impact load, the detection output of the load sensor 42 does not exceed the threshold value stored in the memory 43a, and the sliding piece 35 inside the housing 32 is located at the first position 36. . On the other hand, when the truck 10 collides with the front, a shocking and large forward load acts on the seat 13 (range (a) in FIG. 10). Then, the detection output of the load sensor 42 exceeds the threshold value stored in the memory, and the controller 43 recognizes that the truck 10 has collided with the front and controls the inflator 45a to inflate the air bag 45. This prevents the person 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 FIG. 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 of FIG. 10 (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 sheet 13 (range (c) in FIG. 10). 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. Then, when a backward 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, and the inclined portion 31a is inclined as shown in FIG. Due to the front surface 31 c, the locking member 33 is immersed in the housing 32 against the urging force of the coil spring 40. Then, as shown in FIG. 7, the locked member 31 is allowed to move backward, and the upper rails 17 a and 17 b retreat along with the seat 13 along the lower rails 16 a and 16 b. 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 the upper rails 17a, 17b are retracted together with the seat 13, the locking tool 33 is sequentially engaged with the rear locked portion 31a, so that the upper rails 17a, 17b are held at the retracted positions, Even if a forward load is applied, the seat 13 does not move forward.

  On the other hand, if another vehicle collides with the vehicle 10 from the rear in a state where the seat 13 is retracted and the locking tool 33 is locked to the locked portion 31a behind the original, the seat 13 is shocked. A backward load acts (range (d) in FIG. 10). Then, as shown in FIGS. 7 and 8, the internal member 35 b of the sliding piece 35 returns from the second position 37 to the first position 36 and prohibits the pair of locking members 33 and 33 from being immersed. Thereby, the backward movement of the seat 13 when the vehicle 10 is further bumped from behind is prohibited. In this embodiment, since the load sensor 42 is shared with the sensor used in the deployment device of the airbag 45, the number of parts can be reduced as compared with the case where the load sensor 42 is provided independently. 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. .

On the other hand, when the vehicle 10 is collided from behind without causing a frontal collision, a shocking and large forward load is not applied to the seat 13. Therefore, the detection output of the load sensor 42 does not exceed the threshold value stored in the memory 43a, and the sliding piece 35 inside the housing 32 is located at the first position 36. Therefore, the pair of locking tools 33 and 33 are maintained in a state where they cannot be immersed. As a result, when the vehicle 10 collides from behind without causing a frontal collision, the backward movement of the seat 13 is prohibited.
In this embodiment, the cab-over type truck is used as the vehicle. However, a passenger car or other vehicles may be used.
In this embodiment, the driver's seat is used as the seat, but it may be a passenger seat or other seats.

FIG. 4 is a cross-sectional view taken along the line BB in FIG. The CC sectional view taken on the line of FIG. AA line sectional view of Drawing 4. The D section enlarged perspective view of Drawing 9 showing the seat lock release device of the vehicular seat of the present invention. Sectional drawing corresponding to FIG. 1 which shows the state which the sliding piece moved from the 1st position to the 2nd position, and the latching tool began to be immersed in a housing. Sectional drawing corresponding to FIG. 2 which shows the state which the sliding piece moved to the 2nd position from the 1st position. Sectional drawing corresponding to FIG. 1 which shows the state which the latching tool latched to the to-be-latched latched part from the beginning. Sectional drawing corresponding to FIG. 2 which shows the state which the internal member in the sliding piece returns from a 2nd position to a 1st position, and prohibits immersion of a pair of locking tool. 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. The block diagram which shows the seat lock cancellation | release apparatus of the conventional vehicle seat.

Explanation of symbols

10 Truck (vehicle)
11a Floor 13 Seat 13a Seat cushion 14 Moving member 16a, 16b Lower rail 17a, 17b Upper rail 20 Seat fixing means 21 Plate with hole 21a Square hole 22 Adjustment handle 24 Claw member 26 Torsion coil spring 31 Locked member 32 Housing 33 Locking tool 35 sliding piece 35a outer cylinder 35b inner member 36 first position 37 second position 39 maintenance spring 40 coil spring 41 gas generator (driving means)
42 Load sensor 43 Controller 45 Air bag

Claims (5)

A pair of lower rails (16a, 16b) disposed in the traveling direction of the vehicle (10) on the floor (11a);
A moving member (14) connecting the pair of lower rails (16a, 16b) and attached to the pair of lower rails (16a, 16b) so as to be movable along a longitudinal direction;
Fixed to the seat cushion (13a) of the seat (13) so as to face the pair of lower rails (16a, 16b), respectively, and movable in the front-rear direction to the pair of lower rails (16a, 16b) or the moving member (14) A pair of upper rails (17a, 17b) respectively attached to the
A seat unlocking device for a vehicle seat, comprising: a seat fixing means (20) for selectively fixing the pair of upper rails (17a, 17b) to an arbitrary position in the front-rear direction of the moving member (14). ,
A pair of locked members (31, 31) respectively provided on the inner side of the pair of lower rails (16a, 16b);
A housing (32) provided on a moving member (14) 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 locking tools (33, 33) is prohibited from being inserted at a first position (36) between the base ends of the pair of locking tools (33, 33), which is movably accommodated 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) that is disengaged from the base ends of the pair of locking tools (33, 33);
Drive means (41) for moving the sliding piece (35) from the first position (36) to the second position (37);
A load sensor (42) for detecting a load acting on the seat (13);
A seat lock release device for a vehicle seat, comprising: a controller (43) that controls the drive means (41) based on a detection output of the load sensor (42).   The load sensor (42) is a sensor used in the deployment device of the airbag (45), and the sliding piece (35) is moved from the first position (36) to the second position by the gas generated by the driving means (41). The seat lock release device for a vehicle seat according to claim 1, wherein the seat lock release device is a gas generator moved to the position (37). The sliding piece (35) has an outer cylinder (35a) and an inner member (35b) inserted into the outer cylinder (35a) so as to be movable in the traveling direction of the vehicle (10),
A maintenance spring (39) for biasing the sliding piece (35) to be maintained in the first position (36) or the second position (37) is provided in the housing (32),
The internal member when the backward load acting on the seat (13) becomes a predetermined impact value or more with the maintenance spring (39) maintaining the sliding piece (35) in the second position (37). 3. The vehicle according to claim 1, wherein the vehicle is configured so that the pair of locking members (33, 33) is prohibited from being retracted from the second position (37) to the first position (36). Seat unlock device for seats. When the load acting on the seat (13) is forward, the pair of latches (33, 33) is unable to immerse the base end in the housing (32) and the load acting on the seat (13) is backward. A base end is provided in the housing (32) so as to be immersible, and the pair of locking tools (33, 33) is provided so that the distal ends of the pair of locking tools (33, 33) protrude from the moving member (14), respectively. 33) is provided with a pair of coil springs (40) for urging each,
The pair of coil springs (40) are adjusted so as to allow the pair of locking members (33, 33) to be immersed when a rearward load exceeds a predetermined value for normal running. The seat lock release device for a vehicle seat according to claim 1. A sheet fixing means (20) is provided on the moving member (14) and has a holed plate (21) in which a plurality of square holes (21a) are formed along the longitudinal direction of the upper rails (17a, 17b), and the upper rail ( 17a, 17b) and the adjustment handle (22) attached to the upper rail (17a, 17b) so as to be rotatable about the axis as the rotation center, and the base end is fixed to the adjustment handle (22). A claw member (24) configured to be selectively inserted into the plurality of square holes (21a), and a claw member (24) wound around the adjustment handle (22) so that the tip of the claw member (24) The seat lock for a vehicle seat according to any one of claims 1 to 4, further comprising a torsion coil spring (26) for urging the adjusting handle (22) to rotate in a direction of insertion into (21a). Release device.

Images