JP4143697B2 - 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. 13, 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 disposed 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 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 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 moving 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 moving 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. A sliding piece 35 that allows the pair of locking tools 33, 33 to be immersed at a second position 37 that is disengaged from the base ends of the stoppers 33, 33, and a sliding piece 35 that is provided on the housing 32 from the second position 37. A spur urging to move to the first position 36 Formed in the housing 32 and the gas generator 41 for moving the sliding piece 35 from the first position 36 to the second position 37 against the urging force of the spring 38 by the generated gas provided in the housing 32. The gas generator 41 discharges the gas generated inside the housing 32 to the atmosphere and detects the orifice 32a that reduces the gas pressure that urges the sliding piece 35 toward the second position 37, and the load acting on the seat 13. And a controller 43 that controls the gas generator 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.

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 by the detection output of the load sensor 42 and controls the gas generator 41 to generate the generated gas. Thus, the sliding piece 35 is moved from the first position 36 to the second position 37 against the urging force of the spring 38. 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.
Here, the gas generated by the gas generator 41 inside the housing 32 is gradually released from the orifice 32a to the atmosphere after the sliding piece 35 moves to the second position 37 as shown in FIG. The gas pressure that urges the valve in the direction of the second position 37 gradually decreases. Therefore, even if the vehicle 10 is collided with the following vehicle immediately after the frontal collision, the movement of the vehicle 10 is not disabled before the seat 13 moves backward unless the pressure decreases. When a frontal collision occurs, the seat can be reliably retracted.

On the other hand, when the gas inside the housing 32 is released to the atmosphere through the orifice 32a and the gas pressure for urging the sliding piece 35 is lower than the urging force of the spring 38, the sliding piece 35 is moved to the first position as shown in FIG. Returning from the second position 37 to the first position 36, the immersion of the pair of locking members 33, 33 is prohibited. Accordingly, after a predetermined time has elapsed since the frontal collision, that is, after the seat 13 has been retracted and the locking tool 33 is locked to the locked portion 31a at the rear of the vehicle, another vehicle is moved rearward. The rearward movement of the seat 13 in the case of a rear-end collision is prohibited.
On the contrary, if the vehicle 10 is collided from behind without causing a frontal collision, the controller 43 does not recognize the frontal collision by 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 vehicle 10 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 characterized by being 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 score can be reduced, and the unit price can be prevented from being pushed up.

The invention according to claim 3 is the invention according to claim 1 or 2, and as shown in FIGS. 1 to 3, when the load acting on the seat 13 is forward, The housing 32 is provided so that the base end is not immersible and the load acting on the seat 13 is rearward so that the base end is immersible in the housing 32, and the distal ends of the pair of locking members 33, 33 are respectively attached to the moving member 14. A pair of coil springs 40 for urging the pair of locking tools 33 and 33 so as to protrude are provided, and the pair of coil springs 40 is paired with a pair of locking tools when the rearward load becomes equal to or greater than a normal traveling value. 33 and 33 are adjusted so as to allow immersion.
In the seat lock release device for a vehicle seat according to the third aspect, the upper rails 17a and 17b can be prevented from moving forward together with the seat 13 even if a forward load or a forward acceleration is applied to 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 4 is the invention according to any one of claims 1 to 3, and as shown in FIGS. 3 and 4, the seat fixing means 20 is provided on the moving member 14 and the upper rails 17 a and 17 b. The plate 21 with holes in which a plurality of square holes 21a are formed along the longitudinal direction of the upper rails 17a and 17b, and the upper rails 17a and 17b are attached to the upper rails 17a and 17b so as to be rotatable along the longitudinal direction of the upper rails 17a and 17b. The adjustment handle 22, the claw member 24 whose base end is fixed to the adjustment handle 22, and the tip is configured to be selectively inserted into the plurality of square holes 21a, and the tip of the claw member 24 wound around the adjustment handle 22 are square. A torsion coil spring 26 that biases the adjusting handle 22 to rotate in the direction of insertion into the hole 21a is provided.
In the seat lock release device for a vehicle seat described in claim 4, the adjustment handle 22 is rotated together with the claw member 24 so that the tip of the adjustment handle 22 is detached from the square hole 21a 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.

The invention according to claim 5 is the invention according to any one of claims 1 to 4, wherein the orifice 32 a has a hole diameter of 0.8 to 1.0 mm.
In the seat lock release device for a vehicle seat according to the fifth aspect, the sliding piece can be positioned at the second position for a time that allows the seat 13 to sufficiently retract when the vehicle 10 collides with the front.

  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. An allowable sliding piece, a gas generator for moving the sliding piece from the first position to the second position, a load sensor for detecting a load acting on the seat, and a gas generator based on the detection output of the sensor 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 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.

  A spring that biases the sliding piece to move from the second position to the first position is provided, and the gas generated inside the housing is released to the atmosphere by the gas generator to move the sliding piece in the second position direction. Since the orifice that reduces the gas pressure to be energized is formed in the housing, even if the vehicle collides with the following vehicle immediately after a frontal collision, if the pressure has dropped before the seat has moved backward The movement is not disabled, and the seat can be reliably moved back when the vehicle collides with the front. On the other hand, when the gas inside the housing is released to the atmosphere through the orifice and the gas pressure for urging the sliding piece falls below the urging force of the spring, the sliding piece returns to the first position, and the pair of locking tools Prohibit immersion. Therefore, after a predetermined time has elapsed after the frontal collision, the backward movement of the seat when another vehicle collides with the vehicle from the rear can be prohibited.

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 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, 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 is 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.

  As shown in FIGS. 1 to 3, 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 has a first position 36 indicated by a solid line in FIG. 2 between the base ends of the pair of locking tools 33, 33, and a base end of the locking tool 33 in front of the first position 36. A second position 37 indicated by a broken line inside the detached housing 32 is movably accommodated in the housing 32. The housing 32 accommodates a spring 38 that biases the sliding piece 35 from the second position 37 indicated by the broken line to the first position 36 indicated by the solid line in front of the sliding piece 35. A gas generator 41 for moving the sliding piece 35 from the first position 36 to the second position 37 against the urging force of the spring 38 by the generated gas is provided at the rear portion of 32. As shown in detail in FIG. 2, the gas generator 41 has been conventionally used for deploying an airbag 45 (FIG. 9), 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. When the ignition device 41a is ignited, nitrogen gas is generated from the gas generating agent 41d. The cover 41c is ruptured, and the pressure of the gas resists the biasing force of the spring 38. Thus, the sliding piece 35 is configured to move from the first position 36 to the second position 37.

  On the other hand, the upper portion of the housing 32 is formed with an orifice 32a that discharges the gas generated by the maintenance gas generator 41 after the sliding piece 35 has moved to the second position 37 to the outside. A communication hole 32b is formed to allow the air inside the housing in front of the sliding piece 35 to communicate with the outside so that the sliding piece 35 moves quickly. The hole diameter of the orifice 32 a is appropriately determined in relation to the amount of gas generated by the gas generator 41 and the biasing force of the spring 38. In other words, it is determined that the sliding piece is positioned at the second position for a time that allows the seat 13 to sufficiently retract when the frontal collision of the vehicle 10 occurs.

Specifically, the relationship between the hole diameter of the orifice 32a and the spring constant of the spring 38 has been examined and will be described below. The amount of gas generated by the gas generator 41 provided in the conventional airbag 45 is about 60 liters. On the other hand, it is known that the acceleration when the vehicle collides front is generally within 100 ms. Therefore, it is considered that the retraction of the seat 13 is completed after 100 ms, and the hole diameter of the orifice 32a and the spring 38 for returning the sliding piece 35 from the second position 37 to the first position 36 in 100 ms. The relationship with the spring constant was graphed by numerical analysis. The result is shown by a solid line in FIG. From the solid line shown in FIG. 11, it is found that the relationship of Y = 1997 (X−1.2) ⁴ is established, where X is the diameter of the orifice 32a and Y is the spring constant of the spring 38. Here, since the spring constant Y that can be practically used is preferably 50 N / mm or less, it is as shown in FIG. 12 when the spring constant Y indicates around 50 N / mm according to the above-described formula. From FIG. 12, in order to return the sliding piece 35 from the second position 37 to the first position 36 after 100 ms from the frontal collision, the hole diameter of the orifice 32a is reduced to 0 using a spring 38 having a spring constant of 50 N / mm or less. Preferably, the diameter of the orifice 32a is 0.85 to 0.95 mm using a spring 38 having a spring constant of 30 to 10 N / mm.

  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 airbag 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. It is configured so that nitrogen gas can be introduced into the interior of the apparatus. 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. In addition, the gas generator 41 provided in the housing 32 is controlled to move the sliding piece 35 from the first position 36 to the second position 37.

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 gas generator 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.

  Here, the gas generated by the gas generator 41 inside the housing 32 is gradually released from the orifice 32a to the atmosphere after the sliding piece 35 moves to the second position 37 as shown in FIG. The gas pressure that urges the valve in the direction of the second position 37 gradually decreases. For this reason, the sliding piece 35 does not return to the first position 36 until the gas pressure is reduced and the pressure is reduced by the urging force of the spring 38. Therefore, even if the vehicle 10 is collided with the following vehicle immediately after the frontal collision, the movement of the vehicle 10 is not disabled before the seat 13 moves backward unless the pressure decreases. When a frontal collision occurs, the seat can be reliably retracted.

  On the other hand, when the gas inside the housing 32 is released to the atmosphere through the orifice 32a and the gas pressure for urging the sliding piece 35 is lower than the urging force of the spring 38, the sliding piece 35 is moved to the first position as shown in FIG. Returning from the second position 37 to the first position 36, the immersion of the pair of locking members 33, 33 is prohibited. Accordingly, after a predetermined time has elapsed since the frontal collision, that is, after the seat 13 has been retracted and the locking tool 33 is locked to the locked portion 31a at the rear of the vehicle, another vehicle is moved rearward. Even if the vehicle 10 makes a rear-end collision, the backward movement of the seat 13 is prohibited when the vehicle 10 is further rear-end collision. Here, in this embodiment, since the load sensor 42 is shared with the sensor used for 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. 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.

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. FIG. 3 is a cross-sectional view corresponding to FIG. 2 showing a state in which the sliding piece returns from the second position to the first position and prohibits the immersion of the pair of locking tools. 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 graph which shows the relationship between the hole diameter of the orifice for the sliding piece to return in 100 ms, and the spring constant of a spring. The graph which shows the relationship between the hole diameter of the orifice in which the spring constant shows 50 N / mm vicinity, and the spring constant of a spring. 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 32a Orifice 33 Engagement Stopper 35 Sliding piece 36 First position 37 Second position 38 Spring 40 Coil spring 41 Gas generator 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);
A spring (38) provided on the housing (32) for biasing the sliding piece (35) to move from the second position (37) to the first position (36);
Gas generated in the housing (32) moves the sliding piece (35) from the first position (36) to the second position (37) against the biasing force of the spring (38). A gas generator (41);
The gas generated in the housing (32) by the gas generator (41) formed in the housing (32) is released to the atmosphere to attach the sliding piece (35) in the direction of the second position (37). An orifice (32a) for reducing the pressure of the gas,
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 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. 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) according to claim 1 or 2, wherein the pair of coil springs (40) are adjusted to allow the pair of locking tools (33, 33) to be immersed when a rearward load exceeds a predetermined value for normal running. A seat lock release device for a vehicle seat.   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 3, further comprising a torsion coil spring (26) for urging the adjusting handle (22) to rotate in a direction of insertion into (21a). Release device. The seat lock release device for a vehicle seat according to any one of claims 1 to 4, wherein the orifice (32a) has a hole diameter of 0.8 to 1.0 mm.

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