JPH10250438A - Seat lock unlocking device for seat for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make applicable for not only a driver's seat but also a passenger seat or the like, enable the seat to surely retract when a vehicle is in head-on collision, and improve ejection of a seater in the seat. SOLUTION: In this device, an upper rail 17a fixed to a seat cushion, so as to be opposed to a lower rail 16a, is mounted movably in a longitudinal direction in the lower rail 16a, a first lock fixture 31 lockable to a first locked part provided in the upper rail 17a is provided in the lower rail. A webbing 46 loosely fitting a tongue plate 46a with a driver 15 lockable is mounted in a car body in one sideward of a seat 13, a base end is pivotally mounted through a mounting pin 47a in the car body in the other sideward of the seat, in a plate lock fixture 48, in a tip end thereof, a buckle 48a with the tongue plate lockable is provided. The plate lock fixture 48 and the first lock fixture 31 are connected by a cable 49, a slot in a base end side of the plate lock fixture 48 is loosely fitted to a mounting pin 47a, and a protrusion 48c holding the mounting pin 47a in a tip end side of the slot is protrusively provided in the vicinity of a tip end of the slot.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for automatically releasing a seat lock of a seat at the time of a frontal collision of an automobile.

[0002]

2. Description of the Related Art As a retreating device of this kind, the present applicant has
A large number of locked holes are provided on the lower rail fixed to the floor, and a seat cushion is attached to the upper rail slidably disposed on the lower rail so as to face the steering column. A utility model registration application has been filed for a device for automatically retreating a vehicle driver's seat in which an adjusting handle having a locking claw that can be locked to the upper rail is rotatably attached to the upper rail (Japanese Utility Model Application Laid-Open No. 7-11437). In this device, the locking claw is formed so as to be tapered toward the locked hole, and the rear edge of the locking claw is inclined at a predetermined angle with respect to the direction in which the locking claw is locked. .

In the thus configured device for automatically retreating the vehicle driver's seat, when the vehicle collides from the front, the steering column moves rearward and pushes the cushion frame. At this time, since the rear edge of the locking claw is inclined with respect to the direction in which the locking claw is locked, the locking claw slides and separates from the locked hole. As a result, the cushion frame moves rearward together with the seat cushion and the seat back, so that the driver can easily escape from the colliding vehicle.

[0004]

However, in the above-mentioned conventional device for automatically retreating the driver's seat for a vehicle, if the seat cushion is not pushed by a steering column with a load of a predetermined value or more after the frontal collision of the vehicle, the device retreats. That is, there is a problem that it can be applied only to the driver's seat where the steering column is located forward. SUMMARY OF THE INVENTION An object of the present invention is to provide a seat unlocking device for an automobile seat that can be applied not only to a driver's seat but also to a passenger seat and the like, can surely retreat a seat at the time of a frontal collision of an automobile, and improve escape of a seat occupant. To provide. Another object of the present invention is to provide a seat lock release device for a vehicle seat that can prevent the seat from advancing when the first locking member is separated from the first locked portion.

[0005]

The invention according to claim 1 is
As shown in FIGS. 1 and 4, the automobile 1 is placed on the floor 11a.
0, a pair of lower rails 16 extending in the direction of travel.
a, 16b and the seat cushion 13 of the seat 13 so as to face the lower rails 16a, 16b, respectively.
a, and a pair of upper rails 17a, 17b respectively attached to the pair of lower rails 16a, 16b so as to be movable in the front-rear direction.
Alternatively, a first locked portion 21 provided on the lower rails 16a, 16b, and a first locking member 31 provided on the lower rails 16a, 16b or the upper rails 17a, 17b and removably locked to the first locked portion 21. And a tongue plate 46 attached to the vehicle body on one side of the seat 13 or one side of the seat 13.
a is loosely fitted and the webbing 46 is capable of restraining the occupant 15 on the seat 13, and the base end is pivotally attached to the vehicle body on the other side of the seat 13 or the other side surface of the seat 13 via the mounting pin 47 a and the tongue is provided at the tip end. Buckle 4 for releasably locking plate 46a
This is a seat lock release device for a motor vehicle seat including a plate locking member 48 provided with 8a, and a cable 49 connecting the plate locking member 48 and the first locking member 31.

[0006] The characteristic configuration is that the plate locking member 48
Is provided on the base end side of the plate locking member 48.
8, and a projection 48 protruding near the tip of the elongated hole 48b and holding the attachment pin 47a on the tip end side of the elongated hole 48b.
c, and when a load equal to or more than a predetermined forward value is applied to the occupant 15 restrained by the webbing 46 while the tongue plate 46a is locked to the buckle 48a, the projection 48c moves over the mounting pin 47a. Plate lock 4
The first locking member 31 is configured to be separated from the first locked portion 21 via the cable 49 by the movement of the webbing 46 in the direction in which the webbing 46 is loosened.

In the vehicle seat unlocking device according to the first aspect of the present invention, when the vehicle 10 collides from the front, a load greater than a predetermined forward value acts on the occupant 15 of the seat 13. Webbing 46
, A tension F exceeding a predetermined value is generated. Due to the tension F, the projection 48c or the mounting pin 47a is elastically or plastically deformed, and the projection 48c climbs over the mounting pin 47a, so that the plate locking member 48 moves in a direction to loosen the webbing 46, and at the same time, the first locking member. 31 is the first through the cable 49
It detaches from the locked part 21. As a result, the upper rail 1
The upper rails 17a, 17b can move in the front-rear direction with respect to the lower rails 16a, 16b.
7b retreats with the seat 13.

The invention according to claim 2 is the invention according to claim 1, and as shown in FIGS. 1 and 7, at predetermined intervals along the lower rails 16a, 16b or the upper rails 17a, 17b. The plurality of second locked portions 22 provided and the upper rails 17a, 17b or the lower rail 1
A second locking member that is pivotally attached to the first and second lockable portions and is configured to be selectively locked to the plurality of second locked portions, and that allows the upper rails to be retracted and prevents the upper rails from moving forward; It is characterized by. In the vehicle seat release device according to the second aspect, the first locking member 31 is provided.
Is disengaged from the first locked portion 21, even if the seat 1
Even if a forward load acts on the upper rails 17a, 17
b can be prevented from moving forward with the seat 13.

The invention according to claim 3 is the invention according to claim 1, wherein the length of the elongated hole 48b of the plate locking member 48 is 10 mm to 20 mm as shown in FIGS. It is characterized by the following. Long hole 48 of the plate locking member 48
The length of b was limited to the range of 10 mm to 20 mm.
If it is less than 10 mm, there is a problem that the first locking member 31 cannot be securely detached from the first locked portion 21.
If the distance exceeds mm, there is a problem that the function of the webbing 46 for restraining the occupant 15 cannot be sufficiently exhibited.

[0010]

Embodiments of the present invention will now be described in detail with reference to the drawings. As shown in FIGS. 1 to 9, a cab 11 of a cab-over type truck 10 has a steering column 1 for rotatably holding a steering shaft.
A driver's seat 13 is provided opposite to the driver seat 2, and the driver's seat 13 is attached to the floor 11 a via a seat lock release device 14. The driver's seat 13 includes a seat cushion 13a that receives the buttocks of the driver 15 and a seatback 13c that is attached to the rear end of the seat cushion 13a via a reclining adjuster 13b and that receives the back of the driver 15 (FIGS. 1 to 1). 3 and FIG. 9). A cushion frame 13d in which a round pipe is formed in a square frame shape is built in a lower portion of the seat cushion 13a (FIGS. 4, 7, and 8). The seat unlocking device 14 is mounted on the floor 11a of the truck 10
A pair of lower rails 16 extending in the traveling direction of
a, 16b, a pair of upper rails 17a, 17b fixed to the seat cushion 13a via a seat track 19 so as to face the pair of lower rails 16a, 16b, respectively, and a first locked member provided on the upper rail 17a. A portion 21 and a first locking member 31 provided on the lower rail 16a and removably locked to the first locked portion 21 (FIGS. 1 to 8).

The lower rails 16a and 16b are connected to the floor 11a.
It is attached via a seat leg 18 and a seat bracket 20 (FIGS. 1 to 3 and 9). Lower rail 1
A single roller housing 23 and a pair of steel ball housings 24, 24 are formed between 6a, 16b and upper rails 17a, 17b, respectively (FIG. 8). A roller bracket 26 is attached to each of the upper rails 17a and 17b in the roller housing 23.
A roller 27 (FIGS. 1 to 3 and FIG. 8) rotatably mounted is accommodated in the upper rails 17a, 17b by rolling the roller 27 on the roller rolling surface 16c of the lower rails 16a, 16b. Is the lower rail 16
a and 16b are configured to be movable along the longitudinal direction.
Two rollers 27 are attached to each of the pair of upper rails 17a and 17b (FIGS. 1 to 3). The pair of steel ball storage portions 24, 24 respectively store a pair of steel balls 28, 28 for preventing the lower rails 16a, 16b and the upper rails 17a, 17b from rattling in the width direction and the vertical direction (FIG. 8). .

The seat track 19 has a pair of lower rails 19a and 19b fixed to the upper surfaces of the pair of upper rails 17a and 17b by rivets 30 (FIG. 7), respectively.
A pair of upper rails 19c fixed to the seat cushion 13a via the first and second connection brackets 51, 52 (FIGS. 4, 7 and 8) so as to face the pair of lower rails 19a, 19b, respectively. , 19d (FIGS. 1 to 4, 7 and 8). The lower rail 19a,
19b and the upper rails 19c and 19d are the lower rail 16
a, 16b and the upper rails 17a, 17b are formed in the same shape, respectively, and between the lower rails 19a, 19b and the upper rails 19c, 19d, a roller housing 19e having the same shape as the roller housing 23 and the steel ball housing 24 is provided. And a steel ball housing 19f are formed respectively. The rollers 27 and the steel balls 28 are accommodated in these accommodation portions 19e, 19f.
A roller 19g and a steel ball 19h having the same shape as above are accommodated respectively.

The front and rear ends of the roller rolling surface 16c of the lower rails 16a and 16b are provided with upper rails 17a and 17b.
Forward stopper (not shown) and backward stopper (not shown) for determining the most advanced position and the most retracted position of the
Are protruded, and the upper rails 19c and 19c are also provided at the front end and the rear end of the roller rolling surface 19i of the lower rails 19a and 19b.
A forward stopper (not shown) and a backward stopper (not shown) for determining the most advanced position and the most retracted position of 19d are respectively protruded.

A short pipe 34 is fixed to the outer surface of one of the pair of upper rails 17a, 17b via a pipe support 33 (FIGS. 1 to 6), and a vertical pipe formed on the short pipe 34 is formed. Hole extending in the first direction
The locked portion 21. Also, a pair of lower rails 16a, 1
A cable support 35 having a channel-shaped cross section is fixed to the bottom surface of one of the lower rails 16a of the lower tube 6b. A holding pipe 36 having a sliding hole 36a having the same hole center as the stop portion 21 is fixed. The first locking tool 31 is a pin slidably inserted into the sliding hole 36a. A flange 31a is formed at the base end of the first locking tool 31 so as to contact the lower edge of the holding pipe 36. Is done. A compression coil spring 37a is interposed between the lower surface of the first locking member 31 and the lower piece 35b of the cable support 35,
The first locking member 31 is pushed upward by the elastic force of the spring 37a, and its tip is inserted into the first locked portion 21 of the short tube 34.

Reference numeral 37b in FIGS. 5 and 6 denotes a leaf spring fitted to the lower end of the short tube 34. The leaf spring 37b is formed of an extremely thin steel plate or resin. This spring 37b
When the first locking member 31 is inserted and locked in the first locked portion 21, the first locking member 31 is elastically deformed and abuts on the outer peripheral surface of the first locking member 31. When the first locked portion 21 is pulled out of the first locked portion 21 and separated from the first locked portion 21, it comes into close contact with the lower surface of the short pipe 34 so as to cover a part of the first locked portion 21. As a result, the first locking member 31 can be prevented from being inserted into the first locked portion 21 again.

The driver's seat 13 has a three-point seat belt 4.
5 are provided (FIGS. 1 to 3). This seat belt 45
Is a webbing 46 attached to one side of the driver's seat 13, that is, a vehicle body on the right side, and a plate whose base end is pivotally attached to the other side of the driver's seat 13, that is, a vehicle body on the left side via mounting pins 47 a. A locking tool 48. One end of the webbing 46 is fixed to a vehicle body such as a floor 11a on one side of the driver's seat 13,
The other end is a seat belt retractor (not shown) accommodated in a quarter pillar (not shown) on one side of the driver's seat 13.
It is wound up so that it can be fed out. A tongue plate 46a is loosely fitted to the webbing 46, and a buckle 47a for detachably engaging the tongue plate 46a is provided at an end of the plate locking member 48. By locking the tongue plate 46a to the buckle 47a, the webbing 46 restrains the occupant of the driver's seat 13, that is, the waist and chest of the driver 15. In addition, mounting pin 47a
Are projected from a pin bracket 47 fixed to the rear lower surface of the lower rail 16a.

As shown in detail in FIG. 1, a long hole 4 formed in the base end side of the plate locking member 48 so as to extend in the longitudinal direction of the plate locking member 48 and can be loosely fitted to the mounting pin 47a.
8b is formed, and the mounting pin 4 is provided near the tip of the long hole 48b.
A pair of projections 48 for holding 7a on the tip side of long hole 48b
c and 48c are protruded. The length of the long hole is 10mm ~ 20
It is preferable to set within the range of mm. When a load more than a predetermined forward value is applied to the driver 15 restrained by the webbing 46 with the tongue plate 46a locked to the buckle 48a, the protrusion 48c or the mounting pin 47a is applied.
Is elastically or plastically deformed, so that a pair of protrusions 4
The plate locks 48 move in a direction to loosen the webbing 46 (FIG. 2). Also, the plate locking member 48 and the first
The locking tool 31 is connected with a cable 49 (FIGS. 1 to 1).
(Fig. 3). The cable 49 has a generally U-shaped outer cable 49a having one end fixed to the lower surface of the floor 11a and the other end fixed to the lower piece 35b of the cable support 35, and a plate locking member 48 inserted through the outer cable 49a and having one end. And an inner cable 49b having the other end connected to the lower end of the first locking member 31.

A rail stopper 38 projecting outward and extending along the longitudinal direction of the rail 16a is fixed to the bottom surface of one of the lower rails 16a and 16b by a rivet 38a (FIGS. 1 to 1). 3 and FIG. 7). A plurality of second locked portions 22 are provided on the outer upper surface of the rail stopper 38 at predetermined intervals in the longitudinal direction of the rail 16a.
a, a plurality of second rails
Single second locking member 3 that can be selectively locked to locked portion 22
2 is pivotally connected via a pin 39. The second locked portion 22 is a concave portion formed in a substantially V shape.
2 has a front surface 22a formed on an upright surface extending in a substantially vertical direction, and a rear surface 22b formed on an inclined surface gently climbing rearward (FIGS. 1 to 3).

The second locking member 32 is bent in a substantially inverted L-shape, and the center thereof is pivotally connected to the upper rail 17a via the pin 39. Further, a tension coil spring 40 is stretched between the other end of the second locking member 32 and the upper rail 17a. When one end of the second locking member 32 is pressed against the rear surface 22b of the second locked portion 22 by the elastic force of the tension coil spring 40, the second locking member 32 becomes a plurality of second locked portions. 22. When a backward load acts on the upper rail 17a, the second
The locking member 32 is successively locked to the rear locked portion 22 by the elastic force of the tension coil spring 40 while the upper rail 17 is being locked.
a, the locking device 32 is moved back together with the upper rail 1
7a and 17b are configured to allow retreat.

A holed plate 41 is interposed between the other upper rail 17b and the other lower rail 19b, and a large number of square holes are formed in the holed plate 41 along the longitudinal direction of the rails 17b and 19b. 41a are formed (FIG. 7). A base end of a handle holder 42 is fixed to the upper surface of the other upper rail 19d.
Is bent in a ring shape. This handle holder 4
An adjustment handle 43 is rotatably inserted into the distal end bent into a ring shape. A base end of a claw member 44 is fixed to the adjustment handle 43, and a distal end of the claw member 44 is bent so as to be selectively inserted into the plurality of square holes 41a. A torsion coil spring (not shown) is wound around the adjustment handle 43, and this spring urges the adjustment handle 43 to rotate in a direction of inserting the claw member 44 into the square hole 41a. On the other hand, as shown in detail in FIG. 9, the steering column 12 is supported by a dash panel 53 in front of the driver's seat 13 via a column support bracket 54, and a steering shaft 55 protruding from the upper end of the steering column 12 is provided with a steering wheel 55. It is fixed.

In this embodiment, a cab-over type truck is used as an automobile, but a passenger car or another automobile may be used. Further, in this embodiment, the first locked portion is provided on the upper rail and the first locking device is provided on the lower rail. However, the first locked portion is provided on the lower rail, and the first locking device is provided on the upper rail. It may be provided. Also, in this embodiment, the webbing is attached to the vehicle body on one side of the seat,
Although the base end of the plate lock is attached to the vehicle body on the other side of the seat, the webbing may be mounted on one side of the seat and the base end of the plate lock may be mounted on the other side of the seat. Further, in this embodiment, a three-point seat belt is described, but a two-point seat belt may be used. Also, in this embodiment,
A plurality of second locked portions are provided on the lower rail, and the second locking member is pivotally mounted on the upper rail.
A locked portion may be provided, and the second locking tool may be pivotally attached to the lower rail. In this embodiment, the driver's seat is described as a seat, but a passenger seat or another seat may be used. Further, in this embodiment, the seat track is mounted on the upper surface of the upper rail, but the seat track may be mounted on the lower surface of the lower rail.

The operation of the thus configured truck seat release device will be described. When the truck 10 collides from the front, a shocking and large forward load f acts on the driver's seat 13 (a load indicated by a broken line in the range of FIG. 10). At this time, at the same time as the front of the truck 10 enters the passenger compartment, the driver 15 tries to jump out of the driver's seat 13, that is, a load equal to or more than a predetermined forward value acts on the driver 15. Seat belt 45 to be restrained
A tension F equal to or more than a predetermined value is generated in the webbing 46. Normally, the tension F is larger than the load f in the range of FIG.
Due to this tension F, the tongue plate 46a and the buckle 4
The projection 48c or the mounting pin 47a is elastically or plastically deformed via the mounting pin 8a, and the pair of projections 48c, 48c ride over the mounting pin 47a, so that the plate locking member 48 is pulled up as shown in FIG. The base end of 48b is the mounting pin 47
reaches a. By raising the plate locking member 48,
Since the first locking member 31 is pulled downward via the inner cable 49b, the first locking member 31 is separated from the first locked portion 21.

Immediately after this, a rearward load is applied to the driver's seat 13 by the retreating steering column 12 contacting the seat cushion 13a or the airbag (not shown) being inflated (see FIG. 10). ), The upper rails 17a, 17b move backward along with the driver's seat 13 along the lower rails 16a, 16b (FIG. 3). As a result, the driver's seat 13 can be reliably retreated at the time of a frontal collision of the truck 10, and the escape property of the driver 15 can be improved. Further, as the upper rails 17a, 17b retreat together with the driver's seat 13, the second locking members 32 are sequentially locked to the rear second locked portion 22, so that the upper rails 17a, 17b are held at the retracted positions, Even if a forward load is applied to the driver's seat 13 again, the driver's seat 13 does not move forward.

[0024]

As described above, according to the present invention, the upper rail fixed to the seat cushion is attached to the lower rail on the floor so as to be movable in the front-rear direction, and the first latch provided on the upper rail or the lower rail is provided. A first locking member which can be locked to the lower portion is provided on the lower rail or the upper rail, and a webbing on which the tongue plate is loosely fitted and restrains the occupant of the seat is attached to a vehicle body or the like on one side of the seat; A buckle capable of locking a tongue plate is provided at the tip of a plate locking device pivotally attached to a vehicle body or the like on the other side via a mounting pin, and the plate locking device and the first locking device are connected by a cable. Since the connection, the long hole formed on the base end side of the plate locking tool was loosely fitted to the mounting pin, and the projection for holding the mounting pin on the front end side of the long hole protruded near the front end of the long hole, When a car crashes in front, The acts load equal to or greater than a predetermined value of the forward to occupant, the tension of a predetermined value or more in the webbing for restraining a seat occupant is generated. Since the projection moves over the mounting pin due to this tension, the plate locking member moves in a direction to loosen the webbing, and at the same time, the first locking member separates from the first locked portion via the cable. As a result, since the upper rail can move in the front-rear direction with respect to the lower rail, the upper rail retreats with the seat due to intrusion into the vehicle compartment at the front of the automobile or expansion of the airbag or the like.

Further, a plurality of second locked portions are provided at predetermined intervals along the lower rail or the upper rail, and the upper rails are allowed to retreat by being selectively locked to the plurality of second locked portions. In addition, if the second locking member for preventing advancement is pivotally attached to the upper rail or the lower rail, the upper rail can be moved even when a forward load is applied to the seat when the first locking member is separated from the first locked portion. It can be prevented from moving forward with the seat.

[Brief description of the drawings]

FIG. 1 is an enlarged side view of a portion A in FIG. 9 showing a seat lock release device for an automobile seat according to an embodiment of the present invention.

FIG. 2 is a front view of the vehicle, and a forward load is applied to the seat and the occupant of the seat, and the base end of the long hole of the plate stop reaches the mounting pin; 1
The side view corresponding to FIG. 1 which shows the state detached from the locked part.

FIG. 3 is a side view corresponding to FIG. 1, showing a state in which a rearward load acts on the seat and the upper rail has moved rearward together with the seat;

FIG. 4 is a sectional view taken along line BB of FIG. 1;

FIG. 5 is an enlarged sectional view of a portion C in FIG. 4;

FIG. 6 is a cross-sectional view corresponding to FIG. 5, showing a state in which the first locking member is detached from the first locked portion.

FIG. 7 is a sectional view taken along line DD of FIG. 1;

FIG. 8 is a sectional view taken along line EE of FIG. 1;

FIG. 9 is a side view of a driver's seat of a truck before a frontal collision.

FIG. 10 is a diagram showing a change in load acting on a seat and a change in tension generated in webbing when the truck collides from the front.

[Explanation of symbols]

 Reference Signs List 10 truck (vehicle) 11a floor 13 driver's seat (seat) 13a seat cushion 14 seat unlocking device 15 driver (seat person) 16a, 16b lower rail 17a, 17b upper rail 21 first locked part 22 second locked part 31 first locking tool 32 second locking tool 46 webbing 46a tongue plate 47a mounting pin 48 plate locking tool 48a buckle 48b long hole 48c protrusion 49 cable

Claims (3)

[Claims] 1. A pair of lower rails (16a, 16b) extending on a floor (11a) in a traveling direction of an automobile (10) and facing the pair of lower rails (16a, 16b), respectively. A pair of upper rails (17a, 17b) fixed to a seat cushion (13a) of the seat (13) and movably attached to the pair of lower rails (16a, 16b) in the front-rear direction; and the upper rails (17a, 17b). Or the lower rail (16a, 16
b) provided on the lower rail (16a, 16b) or the upper rail (17a, 17).
b) a first locking member (31) provided on the first locked portion (21) and removably locked to the first locked portion (21); and a vehicle body on one side of the seat (13) or the seat (13). The tongue plate (46a) is loosely fitted on one side and the seat
(13) Webbing (46) capable of restraining the occupant (15) to the seat (13), and a mounting pin (47a) having a base end on the vehicle body on the other side of the seat (13) or the other side surface of the seat (13). A buckle (48a) that is pivotally attached through and to which the tongue plate (46a) is detachably locked at the tip
A seat lock release for an automobile seat, comprising: a plate locking device (48) provided with a cable; and a cable (49) connecting the plate locking device (48) and the first locking device (31). An apparatus, wherein the plate locking member (48) is formed at a base end side of the plate locking member (48) so as to extend in a longitudinal direction of the plate locking member (48), and is attached to the mounting pin (47a). A long hole (48b) that can be loosely fitted, and a projection (48c) protruding near the tip of the long hole (48b) and holding the mounting pin (47a) on the tip side of the long hole (48b). When a load equal to or more than a predetermined forward value is applied to the seated person (15) restrained by the webbing (46) in a state where the tongue plate (46a) is locked to the buckle (48a),
When the projection (48c) moves over the mounting pin (47a) and the plate locking member (48) moves in a direction to loosen the webbing (46), the first locking member (31) moves the cable.
A seat lock release device for a vehicle seat, wherein the device is configured to be detached from the first locked portion (21) via (49). 2. Lower rail (16a, 16b) or upper rail
(17a, 17b), a plurality of second locked portions (22) provided at predetermined intervals, and the upper rail (17a, 17b) or the lower rail (16a, 16
b) a second locking member which is pivotally mounted on the second rail and which can be selectively locked to the plurality of second locked portions (22), and which allows the upper rails (17a, 17b) to retreat and prevents advancement. The vehicle seat unlocking device according to claim 1, comprising (32). 3. The vehicle seat unlocking device according to claim 1, wherein the length of the long hole (48b) of the plate locking member (48) is 10 mm to 20 mm.