JP5430362B2 - Unlocking device for seat slide device - Google Patents

Description

The present invention relates to a lock release device provided with a release lever that acts on a lock mechanism of a seat slide device to release the locked state of an upper rail and a lower rail.
More specifically, the present invention relates to a technique for preventing a release lever from acting on a lock mechanism when a force that is not originally intended to be unlocked is applied to the release lever from the lock release handle side.

Examples of conventional techniques related to the operation of the release lever that releases the locked state of the seat slide device include the following.
(1) Japanese Patent Application Laid-Open No. 2004-122799 (Patent Document 1)
By associating the system that releases the locked state by the lock plate (lock member) by the operation of the release lever linked to the operation of the operation handle and the reclining plate linked to the seat back to the release lever via the connecting member. In a device equipped with a system that releases in conjunction with the rotation of the seat back, the lock mechanism is prevented from being damaged by being configured so that the connection is released when an excessive load is applied to the connection member. Technology.
(2) Japanese Patent Application Laid-Open No. 2007-050829 (Patent Document 2)
In a device for releasing a locked state by a lock lever (lock member) by operating a loop handle under a seat connected to the lock lever, the position of the loop handle is set to be higher than the first position and the first position. A technology that prevents the seated person's legs from touching the loop handle by switching between the second position close to the floor.

JP 2004-122799 A JP 2007-050829 A

In an apparatus in which an operation handle for unlocking the seat slide device is provided under the seat, the release lever may act on the lock mechanism when a seated person's foot touches the operation handle.
The present invention eliminates unnecessary contact between the release lever and the receiving portion side of the lock mechanism so that the release lever does not act on the lock mechanism when the seated person's foot touches the unlocking handle under the seat, etc. Therefore, it aims at extending the lifetime of parts.
Note that the devices disclosed in Patent Documents 1 and 2 do not have a function to prevent the release lever from acting on the lock mechanism when the seated person's foot touches the lock release handle.

  The present invention is configured as the following [1] to [4]. In addition, the code | symbol attached | subjected in this term (means for solving a subject) and the following term (effect of invention) is for understanding easily, and is not the meaning which limits this invention to the structure of a code | symbol.

[1] Configuration 1
A lock release device having a release lever 4 for releasing the lock state of the upper rail 2 and the lower rail 1 by acting on the lock mechanism of the seat slide device,
The release lever 4 is swingable at a portion of the concave groove 4220 and can be detached from a receiving portion 424 to which an operating force from the outside is transmitted and support shafts 2012 and 2022 protruding from the upper rail 2 side. A supported portion 422 supported by the actuator, acting on the lock mechanism by swinging,
The supported portion 422 has a relief space 422c defined by a release lever edge surface that is erected after extending from the opening edge of the concave groove 4220 to the transmitted portion 424 side,
When the release lever 4 is displaced by the external force from the transmitted portion 424 in the direction of the concave groove 4220 and the concave groove 4220 is detached from the support shafts 2012 and 2022, the release lever 4 is a standing portion of the escape space 422c. Locked to the support shafts 2012 and 2022;
An unlocking device characterized by that.

  The relief space may be a U-shaped or J-shaped relief space 422c opened at one end 421 as illustrated in FIG. 1B, and closer to one end 421 ′ as illustrated in FIG. 7B. May be a long hole-shaped escape space 422c ′ closed. Also, the shape without the lower part of U-shape or J-shape (portion 422b in the case of J-shape), that is, L-shape (L-shape of mirror character when viewed from the same direction as FIG. 1B) But you can.

[2] Configuration 2
In configuration 1,
The escape space 422c is formed by folding the lever edge surface from the standing portion 422cc toward a position facing the concave groove 4220.
An unlocking device characterized by that.
Hereinafter, the standing portion 422cc is also referred to as a folded portion 422cc as appropriate.

[3] Configuration 3
In Configuration 1 or Configuration 2,
Movement of the release lever 4 in a position where the swing of the release lever 4 with the support shafts 2012 and 2022 as an axis is not hindered and the groove 4220 is detached from the support shafts 2012 and 2022 Protruding portions 2015/2025 supported on the upper rail 2 side at positions where they can be guided in cooperation with the support shafts 2012, 2022;
An unlocking device characterized by that.

  For example, as shown in FIG. 7A, the positions of the protruding portions 2015 and 2025 are a distance from the lower edge surface 422ai of the upper piece 422a toward the action receiving portion 301 of the lock mechanism from one end portion 421 of the release lever 4. A position P1 extended to a position separated by S1 (S1 <S0) can be given. Here, S0 is the distance between the recessed groove 4220 and the folded portion 422cc.

  Further, as shown in FIG. 7 (b), the lower edge surface 400 ′ of the release lever 4 ′ is moved a distance S1 ′ (S1 ′ <S0) from the one end 421 ′ of the release lever 4 ′ toward the action receiving portion of the lock mechanism. ') The position P2 extended to a distant position can also be mentioned. Here, S0 'is the distance between the concave groove 4220' and the folded portion 422cc '.

[4] Configuration 4
In any of Configuration 1 to Configuration 3,
The upper rail 2 has two parallel standing plates 201 and 202,
The release lever 4 is disposed in the gap between the two standing plates 201 and 202,
The support shafts 2012 and 2022 are portions protruding from the plate surface of the upright plate 201/202 in the direction of the upright plate 202/201.
An unlocking device characterized by that.

As described above, the support shafts 2012 and 2022 are configured by the protrusions that protrude in the direction of the standing plate 202 and / or the standing plate 201 facing the plate surface 201 i of the standing plate 201 and / or the plate surface 202 i of the standing plate 202. The number of parts can be reduced.
The same applies to the protrusions 2015 and 2025 described above, and the protrusions 201 and 2025 protrude from the plate surface 201 i of the standing plate 201 and / or the plate surface 202 i of the standing plate 202 in the direction of the standing plate 202 and / or the standing plate 201. If it comprises a protrusion, the number of parts can be reduced.

  The configuration 1 is a lock release device having a release lever 4 that releases the locked state of the upper rail 2 and the lower rail 1 by acting on a lock mechanism of the seat slide device, and the release lever 4 has an operating force from the outside. And a supported portion 422 supported on a support shaft 2012 and 2022 projecting from the upper rail 2 side so as to be swingable and detachable at the concave groove 4220 portion. Then, it acts on the locking mechanism by swinging, and the supported portion 422 is a clearance space defined by a release lever edge surface that is erected after extending from the opening edge of the concave groove 4220 to the transmitted portion 424 side. 422c, the release lever 4 is displaced by the external force from the transmitted portion 424 toward the concave groove 4220, and the concave groove 4220 is detached from the support shafts 2012 and 2022. The unlocking lever 4 is locked to the support shafts 2012 and 2022 at the erected portion of the escape space 422c. For example, the seating person's foot is the unlocking handle under the seat. When the force is transmitted to the release lever 4 by kicking 5 or the like, the release lever 4 is locked to the support shafts 2012 and 2022 by the standing portion 422cc of the escape space 422c. It is possible to prevent unnecessary contact between the release lever 4 and the lock mechanism side receiving portion.

  Configuration 2 is characterized in that, in Configuration 1, the escape space 422c is formed by folding the lever edge surface from the standing portion 422cc toward a position facing the concave groove 4220. Since it is a lock release apparatus, the effect of the structure 1 can be show | played more reliably.

In the configuration 3, in the configuration 1 or the configuration 2, the position of the release lever 4 with the support shafts 2012 and 2022 as an axis is not hindered, and the concave groove 4220 extends from the support shafts 2012 and 2022. It has a protrusion 2015/2025 supported on the upper rail 2 side at a position where the movement of the release lever 4 in the detached state can be guided in cooperation with the support shafts 2012 and 2022. For example, when the release lever is assembled in the gap between the standing plates 201 and 202, the operation of positioning the concave groove 4220 on the support shafts 2012 and 2022 can be easily performed.
In the configuration 4 according to any one of the configurations 1 to 3, the upper rail 2 includes two parallel standing plates 201 and 202, and the release lever 4 includes the two standing plates 201 and 202. The unlocking device is characterized in that the support shafts 2012 and 2022 are arranged in a gap and project from the plate surface of the upright plate 201/202 in the direction of the upright plate 202/201. Therefore, the number of parts can be reduced.

The front view (a) which looked at the seat slide apparatus provided with the lock release apparatus of embodiment from the seat center side, and the front view (b) which looked through the 2nd standing board 202 transparently. The perspective view which looked at the seat slide device provided with the lock release device of an embodiment from the seat center and the front side. The perspective view which looked at the principal part of the seat slide apparatus provided with the lock release apparatus of embodiment seen through the 2nd standing board 202 from the seat center and front side. The side view which looked at the seat slide apparatus provided with the lock release apparatus of embodiment from the seat front side (right side in FIG. 1). Sectional drawing of the arrow E of FIG. The AA arrow directional view (a) in FIG. 5 and the perspective view (b) of the locking member 30. FIG. Explanatory drawing which illustrates the position of a protrusion part. (A) shows the case where the escape space 422c has a U-shape or J-shape, and (b) shows the case where the escape space 422c 'has a long hole shape.

  The illustrated seat slide device has an upper rail in a space (grooved space) surrounded by a bottom wall portion 10 of the lower rail 1 and two side wall portions (side wall portion 11 and second side wall portion 16) standing from the edge thereof. 2 is a device that accommodates the lower part of 2 and supports it so as to be movable in the rail direction. In order to enable this movement, rollers and balls are interposed in the gap between the upper rail 2 and the lower rail 1 as shown in FIG. Since it is well known that rollers and balls are appropriately interposed in the gap between the upper rail 2 and the lower rail 1, description thereof will be omitted.

  In addition, in the illustrated seat slide device, a lock mechanism (described later) is provided in association with the upper rail 2 and the lower rail 1, so that the movement of the upper rail 2 can be stopped and locked at a desired position. It is possible.

  The lower rail 1 is installed in parallel with the floor surface and forms a bottom wall portion 10 that forms the bottom of the rail, a side wall portion 11 that stands vertically from one edge of the bottom wall portion 10, and an upper edge of the side wall portion 11. It has a ceiling wall portion 12 that is bent and extended inward in the 90-degree rail width direction, and a hanging portion 13 that is bent downward from the tip of the ceiling wall portion 12 by approximately 90 degrees.

Further, the lower rail 1 has a second side wall portion 16 that is bent and extended obliquely upward from the other edge of the bottom wall portion 10 and an inner side in the rail width direction by bending approximately 90 degrees from the tip of the second side wall portion 16. It has the 2nd ceiling wall part 17 extended diagonally upward, and the 2nd drooping part 18 bent from the front-end | tip of the 2nd ceiling wall part 17 and extending to the bottom wall part 10 side.
The lower rail 1 composed of these parts can be manufactured, for example, by bending a single metal plate.

  The upper rail 2 includes two parallel standing plates (a first standing plate 201 and a second standing plate 202) provided vertically, and a standing plate portion 20 that supports a sheet at an upper portion, and the first standing plate 201. A bottom plate portion 21 that is bent and extended from the lower end to the side wall portion 11 side of the lower rail 1 by approximately 90 degrees, and a vertical portion that is bent approximately 90 degrees from the front end of the bottom plate portion 21 and is erected upward. 11, a top plate portion 12, and a side plate portion 22 that is positioned in a groove constituted by the hanging portion 13 and has a tip portion bent obliquely upward.

  Here, the standing plate portion 20 is formed by overlapping and joining the first standing plate 201 and the second standing plate 202 having the step portion 2020 on the upper portion of the step portion 2020. In the gap, the lock member 30 and the lock release lever (release lever) 4 (first lever 41, second lever 42) are sandwiched as described later.

  Further, the upper rail 2 is bent by approximately 90 degrees from the lower end of the second upright plate 202 toward the second side wall portion 16 side of the lower rail 1 and extends to be narrower than the bottom plate portion 21; In a groove formed by bending from the tip of the second bottom plate portion 26 obliquely upward at an obtuse angle, the tip of the second side wall portion 16, the second top wall portion 17, and the second hanging portion 18 of the lower rail 1. The second side plate portion 27 is further disposed at the position.

  The first standing plate 201 of the upper rail 2 composed of these parts and the parts 21 and 22 continuous from the lower end thereof, and the second standing plate 202 and the parts 26 and 27 continuous from the lower end thereof are, for example, 1 It can be manufactured by bending a sheet of metal plate. Instead of this, for example, a single plate material may be bent and bent into a U-shaped cross section at the top in FIG.

  Since the upper rail 2 and the lower rail 1 are configured in this way, a virtual surface (a joint surface at the upper part of the first standing plate 201 and the second standing plate 202) extending the standing plate portion 20 of the upper rail 2 downward. 5), the bottom wall portion 10 of the lower rail 1 is arranged so that the width of the lower portion of the bottom plate portion 21 is wider than the width of the lower portion of the second bottom plate portion 26. To divide. In other words, the portion on the right side of the boundary of the upright plate portion 20 in FIG. 5 is configured to be smaller than the left side portion, and is lightweight.

  The lock mechanism includes a lock member (spring) 30 formed by bending a linear elastic body, a lock hole 201 h formed in the first standing plate 201 of the upper rail 2, and a lower end edge of the hanging portion 13 of the lower rail 1. It has a lock tooth 13t formed by cutting out into an uneven shape, and an engagement hole 22h formed through the side plate portion 22 of the upper rail 2.

Here, the lock member has bases 302, 302 at both ends, two lock protrusions 303, 303 protruding from the bases 302, 302 at both ends, and a center located between the two protrusions 303, 303. The action receiving portion 301 is sandwiched between the first standing plate 201 and the second standing plate 202 of the upper rail 2.
On the other hand, the base portions 302 and 302 at both ends are respectively led out to the opposite surface side of the second standing plate 202 through the through holes of the second standing plate 202 and locked to the cut-and-raised portions 2029 and 2029 on the opposite surface side. (See FIG. 1A).

  The two lock protrusions 303 and 303 can be engaged / disengaged with the lock teeth 13t at the lower end of the hanging part 13 of the lower rail 1 through the corresponding lock holes 201h and 201h of the first standing plate 201. Further, a tongue-shaped portion that is inserted through the engagement holes 22h and 22h formed through the side plate portion 22 of the upper rail 2 and hangs down from the inner surface of the upper wall portion of the engagement holes 22h and 22h. Is engaged. In addition, although the lock protrusion part 303, the lock hole 201h, and the engagement hole 22h are two in the illustrated example, it is needless to say that the number may be changed as appropriate.

  In the lock member having such a configuration, when the action receiving portion 301 is pushed down along the inner wall surfaces (plate surfaces) 201i and 202i of the first standing plate 201 and the second standing plate 202, the lock projecting portions 303 and 303 are It is disengaged from the engagement teeth 13t and enters the unlocked state. Further, when the force that pushes down the action receiving portion 301 is removed, the original state is restored by the spring force, and the lock protrusions 303 and 303 are engaged with the engagement teeth 13t to be locked again.

  The action receiving portion 301 of the lock member is pushed down by a lock release lever (release lever) 4 that operates by receiving an operation force from the lock release handle 5. That is, the operation is performed by the second lever (release lever) 42 that is rotated by the operation force transmitted by the lock release handle 5 and the first lever 41 that is rotated by being pushed by the second lever 42. In addition, the 1st lever 41 and the 2nd lever 42 can also be comprised as a single cancellation | release lever.

This will be described below.
In the gap between the first upright plate 201 and the second upright plate 202 and above the action receiving portion 301 of the lock member 30, the long first lever 41 and the intermediate portion 412 are connected to the first support shafts 2011 and 2021. The tip end portion 411 of the first lever 41 is in contact with the upper surface of the action receiving portion 301 of the lock member 30. Here, one first support shaft 2011 is a cylindrical protrusion formed by projecting a corresponding portion of the first upright plate 201 in the gap direction, and the other first support shaft 2021 is the second upright plate 202. This is a columnar projecting portion formed by projecting a portion facing the one first support shaft 2011 in the gap direction. As described above, in this example, the first support shafts 2011 and 2021 that support the intermediate portion 412 of the first lever 41 so as to be rotatable (swingable) are formed by the protrusions of the first standing plate 201 and the second standing plate 202. Therefore, the number of parts for the first support shaft can be reduced.

  The plate surfaces on both sides of the first lever 41 are in contact with the inner wall surfaces (plate surfaces) 201i and 202i of the first standing plate 201 and the second standing plate 202, respectively. At the time of swinging, the inner wall surfaces 201i and 202i are regulated and guided.

  Further, in the gap between the first upright plate 201 and the second upright plate 202, a long second lever 42 is provided below the first lever 41, and the concave groove 4220 of the supported portion 422 is provided in the second support shaft. It is supported by 2012 and 2022 so that rotation (oscillation) is possible. That is, the portion of the recessed groove 4220 of the supported portion 422 between the one end portion 421 near the action receiving portion 301 of the locking mechanism and the transmitted portion 424 on the other end side to which external force is transmitted from the lock release handle 5 side. The second support shafts 2012 and 2022 are supported so as to be rotatable (swingable). Further, the lower surface of the base end portion 413 of the first lever 41 is in contact with a portion 423 of the second lever 42 near the transmitted portion 424. Therefore, when the second lever 42 swings counterclockwise in FIG. 1, the portion 423 of the second lever 42 pushes up the proximal end portion 413 of the first lever 41. As a result, the first lever 41 swings counterclockwise, and the tip 411 pushes down the action receiving portion 301 of the lock member 30. Thereby, unlocking is performed.

  Further, the end of the unlocking handle 5 is connected to the transmitted portion 424 of the second lever 42, and the operating force of the unlocking handle 5 (the second lever 42 is swung counterclockwise in FIG. 1). Operating force to be moved). Here, one of the second support shafts 2012 is a columnar projecting portion formed by projecting a corresponding portion of the first upright plate 201 in the gap direction, and the other second support shaft 2022 is of the second upright plate 202. This is a cylindrical protrusion formed by protruding a portion facing the one second support shaft 2012 in the gap direction. As described above, in this example, the second support shafts 2012 and 2022 that support the supported portion 422 near the tip portion 421 of the second lever so as to be rotatable (swingable) are used as the first standing plate 201 and the second standing plate 202. Therefore, the number of parts for the second support shaft can be reduced.

  The plate surfaces on both sides of the second lever 42 are in contact with the inner wall surfaces (plate surfaces) 201i and 202i of the first standing plate 201 and the second standing plate 202, respectively. At the time of swinging, the inner wall surfaces 201i and 202i are regulated and guided.

  A portion from the front end 421 of the second lever 42 to the vicinity of the intermediate supported portion 422 is divided into an upper and lower fork, and includes an upper piece 422a and a lower piece 422b shorter than the upper piece 422a. That is, it is J-shaped. The J-shaped inner part (relief space) 422c, that is, the inner part (relief space) 422c of the bifurcated portion has its upper surface constituted by the lower edge surface 422ai of the upper piece 422a, but the lower edge surface 422ai A concave groove 4220 formed by cutting out in an arc shape in a front view (FIG. 1) is provided in the intermediate portion, and the concave groove 4220 can be rotated (swinged) by the second support shafts 2012 and 2022. It is supported by.

  As described above, since the opening portion of the concave groove 4220 provided in the supported portion 422 is continuous with the lower edge surface 422ai of the upper piece 422a, the unlocked portion to which the transmitted portion 424 of the second lever 42 is connected. An external force different from normal handle operation (e.g., an external force generated when the seated person touches the operation handle 5 with his / her foot) is transmitted from the handle 5 (front side of the seat), and the second lever 42 is unlocked. When attempting to swing strongly (counterclockwise in FIG. 1), the latched state supported by the second support shafts 2012 and 2022 in the concave groove 4220 is released, and the second lever 42 moves to the rear of the seat. 2nd support (in the direction of the action receiving portion 301 of the locking mechanism) and the bottom of the J-shape or U-shape (folded portion / standing portion) 422cc of the inside (relief space) 422c of the bifurcated portion Shaft 20 It is engaged by 2,2022. That is, the displacement of the second lever is stopped at that position. That is, the inside (relief space) 422c of the bifurcated portion that is flatly connected to the seat front side opening of the recessed groove 4220 functions as a “relief” against an external force that is intended to rotate (swing) in the unlocking direction. 2 The lever 42 is displaced by a predetermined distance to prevent its rotation (swing). For this reason, the external force from the lock release handle 5 side, which was not originally intended to release the lock, causes the tip 411 of the first lever 41 to collide with the upper surface of the action receiving portion 301 of the lock member 30 unnecessarily. Can be prevented.

Here, the protrusions 2015 and 2025 will be described.
Protruding portions 2015 and 2025 are provided in the vicinity of the release lever 4 (the second lever 42 in FIG. 1) supported so as to be rotatable (swingable) by the second support shafts 2012 and 2022 in the concave groove 4220 described above. Also good. That is, the release lever in a position where the swing of the second lever 42 centering on the second support shafts 2012 and 2022 is not hindered and the groove 4220 is detached from the second support shafts 2012 and 2022. 4 from the plate surface 201i (202i) of one standing plate 201 (202) to a position where the movement of 4 can be guided in cooperation with the second support shafts 2012 and 2022 The protruding portion 2015 (2025) may be provided so as to protrude in the direction. In addition, you may make it protrude from both board surfaces, respectively.

  As the positions of the projecting portions 2015 and 2025 satisfying the above, for example, as shown in FIG. 7A, the lower edge surface of the upper piece 422a from the one end 421 of the release lever 4 toward the action receiving portion 301 of the lock mechanism. A P1 position that is a position obtained by extending 422ai to a position separated by a distance S1 (S1 <S0) can be given. Here, S0 is the distance between the recessed groove 4220 and the folded portion (standing portion) 422cc.

Further, as shown in FIG. 7 (b), the lower edge surface 400 ′ of the release lever 4 ′ is moved a distance S1 ′ (S1 ′ <S0) from the one end 421 ′ of the release lever 4 ′ toward the action receiving portion of the lock mechanism. ') The P2 position which is a position extended to a distant position can also be mentioned. Here, S0 ′ is the distance between the groove 4220 ′ and the folded portion 422cc ′.
When the protrusions are provided in this way, for example, when the release lever is assembled in the gap between the standing plates 201 and 202, the operation of positioning the concave groove 4220 on the support shafts 2012 and 2022 can be easily performed.

  In the above, as the escape space for preventing the release lever from swinging due to an external force that was not originally intended for the unlocking operation, the space shown in FIG. The U-shaped or J-shaped escape space 422c is used, but instead of this, for example, a long hole-shaped escape space 422c ′ close to one end 421 ′ as shown in FIG. 7B is used. May be used.

  Further, in the above, the end of the pipe-like unlocking handle 5 is crushed and flattened, and this is inserted into the gap between the first standing plate 201 and the second standing plate 202 so that the transmitted portion of the second lever 42 is transmitted. 424, but instead of this, for example, the transmitted portion of the second lever is bent and the second standing plate 202 is provided with a through hole, and the other bent end of the second lever is formed from the through hole. And the end of the lock release handle may be fitted into the lead-out portion. Further, the end of the pipe-like handle may be flattened and used as the second lever. That is, the second lever may be integrally formed at the end of the lock release handle.

DESCRIPTION OF SYMBOLS 1 Lower rail 10 Bottom wall part 11 Side wall part 12 Top wall part 13 Drop part 13t Locking tooth 16 2nd side wall part 17 2nd ceiling wall part 18 2nd drop part 2 Upper rail 20 Standing plate part 201 1st standing board 201h Lock hole 201i Plate surface (gap side)
2011 first support shaft (first standing plate side) / columnar protruding portion 2012 second support shaft (first standing plate side) / columnar protruding portion 2015 protruding portion 202 second standing plate 202i plate surface (gap side) )
2021 First support shaft (second standing plate side) / columnar protruding portion 2022 Second support shaft (second standing plate side) / columnar protruding portion 2025 Projecting portion 2029 Cut-and-raised portion 21 Bottom plate portion 22 Side plate portion 22h Engagement hole 26 Second bottom plate portion 27 Second side plate portion 30 Lock member 301 Action receiving portion 302 Base portion 303 Lock projection 4 Lock release lever (release lever)
41 first lever 410 plate surface 411 tip portion 412 intermediate portion 413 base end portion 42 second lever 420 plate surface 421 one end portion 422 supported portion 4220 recessed groove 422a upper piece 422ai upper piece lower edge surface 422b lower piece 422c bifurcated Inside the part (escape space)
422cc The bottom of the bifurcated part (folded part / standing part)
423 Rear end side portion 424 Transmitted portion 5 Lock release handle

Claims (4)

A lock release device having a release lever that releases the locked state of the upper rail and the lower rail by acting on the lock mechanism of the seat slide device,
The release lever includes a transmitted portion to which an operating force from the outside is transmitted, and a supported portion that is swingably supported by a support shaft that protrudes from the upper rail side and is detachably supported at a groove portion. And acting on the locking mechanism by swinging,
The supported portion has a clearance space defined by a release lever edge surface that is erected after extending from the opening edge of the concave groove toward the transmitted portion side,
When the release lever is displaced by an external force in the direction of the groove from the transmitted portion and the groove is detached from the support shaft, the release lever is locked to the support shaft at the standing portion of the clearance space.
An unlocking device characterized by that. In claim 1,
The escape space is formed by folding the lever edge surface from the standing portion toward the position facing the concave groove,
An unlocking device characterized by that. In claim 1 or claim 2,
The movement of the release lever is guided in cooperation with the support shaft at a position that does not hinder the swing of the release lever having the support shaft as an axis and the groove is detached from the support shaft. In a possible position, it has a protrusion supported on the upper rail side,
An unlocking device characterized by that. In any one of Claims 1-3,
The upper rail has two parallel standing plates,
The release lever is arranged in the gap between the two standing plates,
The support shaft is a portion protruding from the plate surface of the upright plate in the direction of the upstanding plate,
An unlocking device characterized by that.

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