JP4128157B2 - Seat lock release device for vehicle seat - Google Patents

Description

  The present invention relates to a vehicle seat lock releasing device that releases a seat lock of a vehicle seat and retracts the seat when a frontal collision of the vehicle occurs.

Conventionally, as a seat lock release device for a vehicle seat, an upper rail fixed to a seat cushion is attached to the lower rail so as to be movable in the front-rear direction so as to face a lower rail disposed on the floor so as to extend in the traveling direction of the vehicle. In addition to providing an elastic body that urges the upper rail in the advancing direction, a plurality of locked portions are provided on the upper rail or the lower rail, and the upper rail is attached to the elastic body. 2. Description of the Related Art An apparatus is known that includes a locking tool that allows a reverse movement against a force and prevents the elastic body from moving forward due to the elastic force of an elastic body (see, for example, Patent Document 1). In this device, when the vehicle collides with the front and the front of the vehicle enters the vehicle interior, when a rearward load greater than a predetermined value acts on the seat cushion, the upper rail moves backward against the elastic force of the elastic body, and the cushion The frame moves backward together with the seat cushion and the seat back, so that the driver can easily escape from the vehicle that has collided.
However, in the conventional seat lock release device for a vehicle seat, a rearward load of a predetermined value or more is applied to the seat cushion even when another vehicle collides with the vehicle from the rear, and the cushion frame is combined with the seat cushion and the seat back. There was a problem that moved backwards.

In order to eliminate this point, an unlocking device as shown in FIG. 13 is considered. That is, the housing 3 is provided in the vehicle, and the respective base ends of the pair of locking tools 4 and 4 are protruded laterally from both sides in the vehicle width direction so as to be retractable, and the pair of locking tools. It is conceivable that the seat 4 is locked when the projections 4 and 4 are in the projecting state and the seat 2 is unlocked when the seats are in the immersion state. In this lock release device, the sliding piece 5 is movably accommodated in the housing 3, and the pair of locking tools 4, 4 at a first position 6 indicated by a solid line between the base ends of the pair of locking tools 4, 4. Intrusion of the pair of locking tools 4, 4 is allowed at the second position 7 indicated by a broken line deviated from the base ends of the pair of locking tools 4, 4. The sliding piece 5 is moved from the first position 6 to the second position 7 by the gas generated by the gas generator 8, and the controller 9 controls the gas generator 8 based on the detection output of the load sensor 9a. Is configured to control.
Therefore, in this lock release device, the gas generator 8 is driven only when the controller 9 collides with the front by the detection output of the load sensor 9a, and the sliding piece 5 is moved from the first position 6 to the second position 7. The gas generator 8 is not driven by the detection output of the load sensor 9a generated when another vehicle collides with the vehicle from behind. This prevents the seat 2 from moving backward when another vehicle collides with the vehicle from behind.
JP-A-10-250435

However, in the unlocking device shown in FIG. 13, the seat 2 is unlocked by driving the gas generator 8 and moving the sliding piece 5 from the first position 6 to the second position 7. If a backward load is applied to the sliding piece 5 immediately after the release is released and the seat 2 returns from the second position 7 to the first position 6, the seat 2 is locked again before the seat 2 is fully retracted. In order to eliminate this point, it is conceivable to provide a fixing means (not shown) for maintaining the sliding piece 5 moved to the second position 7 at the second position 7. If it is fixed at the position 7, it is impossible to prevent the pair of locking members 4 and 4 from being immersed when another vehicle collides with the vehicle after the seat 2 has moved backward. There is a problem that the retracted sheet 2 is further retracted.
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 prevent the seat from retracting when the vehicle is collided from the rear after a frontal collision, while reliably retracting the seat at the time of a frontal collision of the vehicle. It is in.

  As shown in FIGS. 1 to 4 and 11, the invention according to claim 1 includes a housing 32 extending in the traveling direction of the vehicle 10, and the base ends of the housing 32 from both sides in the vehicle width direction. A pair of locking devices 33 configured to lock the seat 13 movably provided to the vehicle 10 in a protruding state and to unlock the seat 13 in the immersive state. 33 and a pair of locking tools 33, which are movably accommodated in the housing 32 and are prevented from immersing the pair of locking tools 33, 33 at a first position 36 between the base ends of the pair of locking tools 33, 33. The sliding piece 35 that allows the pair of locking members 33 and 33 to be immersed at the second position 37 that is disengaged from the proximal end of the 33, and the sliding piece 35 that is provided in the housing 32 and generated by the generated gas is the first position 36. To the second position 37 from the gas generator 41 , A load sensor 42 for detecting a load acting on the seat 13, a seat lock release device for a seat for a vehicle and a controller 43 for controlling the gas generator 41 based on the detection output of the load sensor 42.

  As shown in detail in FIG. 1, the characteristic configuration is that the sliding piece 35 is configured to be capable of independently prohibiting the immersion of the pair of locking members 33, 33 at the first position 36, and the outer cylinder. The internal member 35b is inserted into the outer cylinder 35a along the moving direction of the sliding piece 35, and the gas generator 41 of the insertion pin 35c is provided. A head portion 35d formed at the side end portion and configured to prohibit the immersion of the pair of locking members 33, 33 at the first position 36, and the outer cylinder 35a is connected to the first position 36 or the second position 37. The housing 32 is provided with a first maintenance spring 39 that is biased so as to maintain the rear cylinder 35a in a state where the outer cylinder 35a is maintained at the second position 37, and a backward load acting on the seat 13 is predetermined. When the impact value is exceeded The inner member 35b existing at the second position 37 together with the outer cylinder 35a is returned to the first position 36 to prevent the pair of locking members 33, 33 from being immersed, and the inner member 35b is moved to the first position 36. The housing 32 is provided with a head support member 51 that can be maintained and a second maintenance spring 52 that urges the head support member 51 and maintains the internal member 35 b that has returned to the first position 36 at the first position 36. By the way.

In the seat lock release device for a vehicle seat according to the first aspect, when the vehicle 10 collides with the front, the controller 43 recognizes that the front collision has occurred by the detection output of the load sensor 42 and controls the gas generator 41. Then, gas is generated from the gas generator 41 as shown in FIG. 5, and the sliding piece 35 is moved from the first position 36 to the second position 37 as shown in FIG. Accordingly, as shown in FIG. 7, the pair of locking members 33 and 33 are allowed to be immersed in the housing 32, and the locking of the sheet 13 is released when the pair of locking members 33 and 33 are immersed. Therefore, the seat 13 moves backward due to the intrusion of the front surface of the vehicle 10 into the passenger compartment or the inflation of the airbag, and forms a space where the driver can easily escape from the collision vehicle.
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, as shown in FIG. 1, the sliding piece 35 stays at the first position 36 and maintains the pair of locking members 33, 33 in a state where they cannot be immersed. As a result, the backward movement of the seat 13 when the vehicle 10 is collided from behind is prohibited.

  In addition, since the housing 32 is provided with the first maintenance spring 39 that urges the outer cylinder 35a to be maintained at the first position 36 or the second position 37, it moves from the first position 36 to the second position 37 at the time of a frontal collision. The sliding piece 35 is maintained at the second position 37 by the first maintaining spring 39 while being pressed against the second position 37 by the high pressure gas emitted from the gas generator 41. Therefore, even after the vehicle 10 has collided in the front and before the seat 13 is sufficiently retracted, even if a rearward load is applied to the sliding piece 35, the sliding piece 35 remains in the second position. The situation where the seat 13 is locked again before the seat 13 is sufficiently retracted is avoided without returning to the first position 36 from 37.

  After a predetermined time has elapsed since the frontal collision of the vehicle, the retraction of the seat 13 is completed, and the gas pressure for pressing the sliding piece 35 against the second position 37 becomes zero. On the other hand, when another vehicle collides with the vehicle 10 from the rear in a state where the seat 13 has been retracted due to the frontal collision, the internal member 35b of the sliding piece 35 returns from the second position 37 to the first position 36. The immersion of the pair of locking members 33 and 33 is prohibited. Here, the second maintaining spring 52 urges the internal member 35b that has returned to the first position 36 to be maintained at the first position 36, so that the internal member 35b is prevented from moving toward the second position 37 again. Thus, the immersion of the pair of locking members 33, 33 is effectively prohibited. As a result, it is possible to effectively inhibit the seat 13 from retreating when the vehicle 10 is further bumped from behind.

The invention according to claim 2 is the invention according to claim 1, wherein the vehicle is provided with a deployment device for the airbag 45, and the load sensor 42 is used for the deployment device for the airbag 45, as shown in FIG. It is a sensor.
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 number of points can be reduced, the management burden is also reduced, and the unit price can be prevented from being pushed up.

  In the seat lock release device for a vehicle seat according to the present invention, when the vehicle collides with the front, the controller recognizes the front collision with the detection output of the load sensor, controls the gas generator, and moves the sliding piece from the first position. Move to second position. Thereby, the immersion of the pair of locking tools into the housing is permitted, and the lock of the seat is released. Therefore, the seat moves backward due to the intrusion into the passenger compartment on the front surface of the vehicle or the expansion of the air bag or the like, thereby forming a space where the driver can easily escape from the vehicle with which the driver has collided. On the other hand, even if the vehicle collides from behind, the controller does not recognize that a frontal collision has occurred due to the detection output of the load sensor. Therefore, the sliding piece stays at the first position and maintains the pair of locking tools in a state where they cannot be immersed. As a result, the backward movement of the seat is prohibited when the vehicle is collided from behind.

In the seat unlocking device for a vehicle seat according to the present invention, when the vehicle collides with the front, the seat is retracted, and when the vehicle completes the retraction, when another vehicle collides from the rear, The member returns to the first position. Since the second maintenance spring biases the inner member that has returned to the first position so as to maintain the first member in the first position, movement of the inner member toward the second position again is prevented, whereby a pair of locking tools Immersion is effectively prohibited. Thereby, the backward movement of the seat when the vehicle is further bumped from behind can be effectively prohibited.
Furthermore, if the vehicle includes an airbag deployment device and the load sensor is a sensor used in the airbag deployment device, the number of parts can be reduced compared to the case where the load sensor is provided independently. The management burden is also reduced and the unit price can be prevented from being pushed up.

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 steering column 12 is supported on a dash panel 10a in front of the seat 13 via a column support bracket 10b, and a steering wheel 12b is fixed to a steering shaft 12a protruding from the upper end of the steering column 12. 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 and 17b is attached to the outer sides of the pair of lower rails 16a and 16b so as to be movable along the longitudinal direction thereof. A 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 is connected to a pair of auxiliary rails 14a and 14b, which are movably attached along the longitudinal direction of the pair of lower rails 16a and 16b, and the pair of auxiliary rails 14a and 14b. And a plate 14c. 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. The moving member 14 between 31 includes a housing 32 that extends in the vehicle traveling direction. The locked member 31 is provided along the longitudinal direction on the inner side of the pair of lower rails 16a and 16b. The locked member 31 is formed with a plurality of locked portions 31a at predetermined intervals in the longitudinal direction of the pair of lower rails 16a and 16b (FIG. 2). 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. 2), and the leading end 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, due to the inclined rear surface 31c of the locked portion 31a, the locking tool 33 is immersed in the housing 32 as shown in FIG. 7 against the biasing force of the coil spring 40, and the locking tool 33 moves rearward. As shown in FIG. 10, the tip of the locking tool 33 protrudes by the biasing force of the coil spring 40 when the tip faces the next locked portion 31a behind the locked portion 31a that has been 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. 1 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 first maintenance spring 39 for urging 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 first maintenance spring 39 is accommodated in the case 39a in a direction orthogonal 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 moves. The first maintenance spring 39 is configured to urge the piece receiving member 38 so as to protrude and maintain the outer cylinder 35 a of the sliding piece 35 at the first position 36 or the second position 37.

  As shown in FIG. 1, the housing 32 is provided with a gas generator 41 which is a driving means for moving the sliding piece 35 from the first position 36 to the second position 37. The gas generator 41 is provided at the rear end of the housing 32 so that the sliding piece 35 is moved from the first position 36 to the second position 37 by the generated gas. As shown in detail in FIG. 1, this gas generator 41 has been conventionally used for deploying an airbag 45 (FIG. 11), and is an ignition device that ignites in response to a command from a controller 43 described later. 41a 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, and the ignition device 41a ignites to generate nitrogen gas from the gas generating agent 41d. As shown in FIG. 5, the cover 41c is ruptured and slid by the pressure of the gas. The piece 35 is configured to move from the first position 36 to the second position 37. As shown in FIG. 6, a gas vent hole 32 a is formed in the upper portion of the housing 32 to discharge the gas generated by the gas generator 41 after the sliding piece 35 has moved to the second position 37.

  A load acting on the seat 13 is detected by a load sensor 42. As shown in FIG. 11, the load sensor 42 used in this embodiment is the one 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 12a facing the seat 13 via the gas generator 45a having the same structure as the gas generator 41 described above. 45 is configured so that nitrogen gas can be introduced therein. 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 a gas generator 45 a in the airbag 45 and a gas generator 41 provided in the housing 32. 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 gas generator 41 in the housing 32 is controlled to move the sliding piece 35 from the first position 36 to the second position 37.

As shown in detail in FIG. 1, the outer cylinder 35 a of the sliding piece 35 is configured to be capable of independently prohibiting the immersion of the pair of locking tools 33, 33 at the first position. The inner member 35b inserted into the outer cylinder 35a is movably inserted into an insertion pin 35c inserted through the outer cylinder 35a along the moving direction of the sliding piece 35, and the gas generator 41 side of the insertion pin 35c. And a head portion 35d formed at the end portion and configured to be capable of independently prohibiting the immersion of the pair of locking members 33 at the first position 36. A guide hole 32b is formed in an extension portion of the insertion pin 35c in the housing 32 along the moving direction of the sliding piece 35. The insertion pin 35c is separated from the guiding hole 32b at the first position 36. The sliding piece 35 is configured to be inserted into the guide hole 32b at the second position 37.
Here, the vent hole 32 a formed in the housing 32 gradually reduces the gas pressure that releases the gas inside the housing 32 to the atmosphere and biases the sliding piece 35 to the second position 37. The gas generation amount of the gas generator 41 and the hole diameter of the gas vent hole 32a are determined after elapse of a predetermined time after the gas is generated from the gas generator 41, for example, 0.1 to 0.4 seconds, preferably 0.1. The gas pressure for urging the sliding piece 35 to the second position 37 is adjusted to be zero after 0.2 seconds.

  On the other hand, when the rearward load acting on the seat 13 exceeds the predetermined impact value with the first maintaining spring 39 maintaining the outer cylinder 35a at the second position 37, it exists at the second position 37 together with the outer cylinder 35a. The inner member 35b is configured to return to the first position 36 and prohibit the pair of locking members 33, 33 from being immersed. The housing 32 accommodates a head receiving member 51 that fixes the internal member 35b returned to the first position 36 to the first position 36, and a second maintenance spring 52 that biases the head receiving member 51. The housing 32 is provided in a state of being accommodated in the case 52a. The head receiving member 51 is accommodated in the housing 32 near the head 35d at the first position 36, and the second maintenance spring 52 is provided in a state of being accommodated in the case 52a in a direction orthogonal to the moving direction of the internal member 35b. . The head receiving member 51 is formed with a protruding portion 51a that protrudes toward the head 35d, the front surface 51b of the protruding portion 51a is formed as an inclined surface that gently rises toward the rear, and the rear surface 51c is substantially vertical. It is formed on an upstanding surface that extends. The rear periphery of the outer cylinder 35a is formed to be inclined, and when the outer cylinder 35a is at the first position 36, the rear periphery of the outer cylinder 35a is in contact with the protrusion 51a so that the piece receiving member 51 is immersed in the case 52a. The

  When the outer cylinder 35a moves to the second position 37, the second sustaining spring 52 urges the head receiving member 51 to protrude from the housing 52a, and the housing 32 has a predetermined amount or more of the head receiving member 51. A locking piece 32f that prevents protrusion is formed inside. This locking piece 32f is formed by the head receiving member 51 until the periphery of the head 35d comes into contact with the inclined front surface 51b of the protruding portion 51a when the internal member 35b existing at the second position 37 returns to the first position 36. Configured to allow protrusion. When the inner member 35b returns to the first position 36, the head receiving member 51 comes into contact with the head 35d of the inner member 35b on the inclined front surface of the protruding portion 51a, and is guided by the inclination of the second maintaining spring 52. It is configured to be immersed in the case 52a against the urging force. On the other hand, in a state where the internal member 35b is completely returned to the first position 36, the head receiving member 51 protrudes again by the urging force of the second maintenance spring 52, and the front surface of the head 35d protrudes from the rear surface of the protruding portion 51a. Are in contact with each other, and the internal member 35b is configured to be prevented from moving toward the second position 37 again.

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 is applied to the seat 13 (range (a) in FIG. 12). 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 gas generator 45a to inflate the airbag 45. The driver is prevented from tilting forward and coming into direct contact with the steering wheel 12b. At the same time, the controller 43 controls the gas generator 41 as shown in FIG. 5, and moves the sliding piece 35 from the first position 36 to the second position 37 as shown in FIG. Accordingly, the immersion of the locking tool 33 is allowed as shown in FIG. 7, but the upper rails 17a and 17b are prevented 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 an impact load, the first maintenance spring 39 maintains the sliding piece 35 at the second position 37, and the sliding piece returns to the first position 36 to prohibit the locking tool 33 from being inserted. There is nothing. 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 backward together with the upper rail 17a, and as shown in FIG. 7, the locked portion 31a is inclined. 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. 10, 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.

  Here, the gas emitted from the gas generator 41 into the housing 32 is gradually released into the atmosphere from the gas vent hole 32a, and the gas pressure for urging the sliding piece 35 to the second position 37 gradually decreases. For this reason, the front end of the locking pin 51 is locked to the insertion pin 35 c and the sliding piece 35 is prohibited from returning to the first position 36. Therefore, until the gas pressure becomes zero, in this embodiment, sliding is performed for 0.1 to 0.4 seconds, preferably for 0.1 to 0.2 seconds from the gas generation. Even if the internal member 35b of the piece 35 does not return from the second position 37 to the first position 36, and the vehicle 10 collides with the following vehicle immediately after a frontal collision, the seat 13 is not moved backward. The movement is not disabled, and the seat can be reliably retracted when the vehicle 10 collides with the front.

  On the other hand, when the gas inside the housing 32 is released from the vent hole 32a and the gas pressure becomes zero, the internal member 35b in the sliding piece 35 can be returned from the second position 37 to the first position 36. . For this reason, after a predetermined time has elapsed from the frontal collision of the vehicle, that is, after the retracting of the seat 13 is completed and the locking tool 33 is locked to the locked portion 31a behind the original, When the vehicle collides from the rear, a shocking backward load is applied to the seat 13 (range (d) in FIG. 12). Then, as shown in FIGS. 9 and 10, 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 tools 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.

  Here, when the internal member 35b returns from the second position 37 to the first position 36, the periphery of the head 35d comes into contact with the inclined front surface 51b of the protruding portion 51a of the head receiving member 51, and the internal member 35b When returning to the first position 36, the head receiving member 51 is guided by the inclined front surface of the projecting portion 51 a and is immersed in the case 52 a against the urging force of the second maintenance spring 52, thereby allowing the movement. When the internal member 35b is completely returned to the first position 36, the head receiving member 51 protrudes again by the urging force of the second maintenance spring 52, and the front surface of the head 35d is positioned on the rear surface of the protruding portion 51a. The surface contact is made, and the internal member 35b is prevented from moving toward the second position 37 again. Therefore, the internal member 35b of the sliding piece 35 is fixed to the first position 36, and effectively prevents the pair of locking members 33, 33 from being immersed. As a result, it is possible to effectively inhibit the seat 13 from retreating when the vehicle 10 is further bumped from behind.

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 compared to the case where the load sensor 42 is provided independently. In addition, since the gas generator 41 is a gas generator conventionally used for deploying the airbag 45, it is possible to prevent the number of parts from being reduced and the unit price from being pushed up from the reduction of the management burden. it can.
In this embodiment, a cab-over type truck is used as the vehicle. However, a passenger car or other vehicle 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.

The CC sectional view taken on the line of FIG. 2 which shows the seat lock cancellation | release apparatus of the vehicle seat of this invention. BB sectional drawing of FIG. AA line sectional view of Drawing 4. The D section expansion perspective view of Drawing 11 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 a sliding piece moves to the 2nd position from the 1st position with the gas emitted from the gas generator. Sectional drawing corresponding to FIG. 1 which shows the state which the sliding piece moved to the 2nd position. 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. 1 which shows the state in which the internal member in the sliding piece returns from a 2nd position to a 1st position. Sectional drawing corresponding to FIG. 1 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. 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. 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)
13 Seat 32 Housing 33 Locking tool 35 Sliding piece 35a Outer cylinder 35b Internal member 35c Insertion pin 35d Head 36 First position 37 Second position 39 First maintenance spring 41 Gas generator 42 Load sensor 43 Controller 45 Air bag 52 2nd maintenance spring

Claims (2)

A housing (32) provided extending in the traveling direction of the vehicle (10);
The base (32) is provided in the housing (32) so that the respective base ends protrude from the both sides in the vehicle width direction so as to be retractable, and the seat (13) provided so as to be movable in the vehicle (10) is locked. A pair of fasteners (33, 33) configured to unlock the seat (13) in an immersive state;
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);
A gas generator (41) for moving the sliding piece (35) from a first position (36) to a second position (37) by gas generated in the housing (32);
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) for controlling the gas generator (41) based on a detection output of the load sensor (42),
The sliding piece (35) is arranged in an outer cylinder (35a) and an outer cylinder (35a) configured to be capable of independently prohibiting the immersion of the pair of locking tools (33, 33) in the first position (36) An internal member (35b) inserted movably,
The inner member (35b) includes an insertion pin (35c) inserted through the outer cylinder (35a) along the moving direction of the sliding piece (35), and the gas generator (41) side of the insertion pin (35c). A head portion (35d) formed at an end portion and configured to be capable of independently prohibiting immersion of the pair of locking tools (33, 33) at a first position (36);
A first maintenance spring (39) for biasing the outer cylinder (35a) to maintain the first position (36) or the second position (37) is provided on the housing (32),
When the backward load acting on the seat (13) becomes a predetermined impact value or more with the first maintenance spring (39) maintaining the outer cylinder (35a) in the second position (37), The internal member (35b) existing in the second position (37) together with the outer cylinder (35a) is returned to the first position (36) to prevent the pair of locking tools (33, 33) from being immersed. And
The head receiving member (51) capable of maintaining the inner member (35b) in the first position (36) and the inner member returned to the first position (36) by urging the head receiving member (51). A seat lock releasing device for a vehicle seat, wherein the housing (32) is provided with a second maintenance spring (52) for maintaining (35b) in the first position (36).   The seat lock release of the vehicle seat according to claim 1, wherein the vehicle (10) is provided with a deployment device for the airbag (45), and the load sensor (42) is a sensor used in the deployment device for the airbag (45). apparatus.

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