JP2008120223A - Lock mechanism between rails which can slide and move - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lock mechanism inhibiting two rails from being unlocked even when any inertia force acts on the two rails. <P>SOLUTION: The lock mechanism which locks the first rail and the second one includes: a lock unit, which has a top surface having a through-hole, two sides extending downward from both sides of the top surface, and lock teeth extending from bottom ends of both sides to outside and capable of passing through the notch portions of the first and second rails in such a way as to be movable vertically; a retaining unit, which, comprising a bottom surface having a through-hole and front and rear sides extending upward from front and rear ends of the bottom surface and fixed to the first rail, retains the lock unit in such a way that the lock teeth can move inside the notch portion of the first rail; a guide rod, which has upper and lower portions, whose lower portion passes through the through-hole of the top surface of the lock unit and that of the retaining unit and whose upper portion passes through the through-hole opened in the upper surface of the first rail; and an elastic member, which pushes up the lock unit elastically. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a locking mechanism that locks one rail and the other rail that is slidably moved and accommodated therein.

This type of locking mechanism is used as a mechanism for movably locking a vehicle seat, and is disclosed in Patent Document 1. The lock mechanism disclosed in Patent Document 1 has an operation lever that is rotatably attached to a bracket that is fixed to a lower rail that is attached to a floor to which a seat is fixed, and the operation lever has a lock pole. It is fixed. Furthermore, the lock pole passes through the lock hole formed below the bracket, passes through one of a plurality of openings formed at regular intervals in the longitudinal direction on the side surface of the lower rail, and inside the lower rail of the upper rail. It has a latching portion that is formed in a portion that hangs down and engages and simultaneously penetrates the lock hole. The movement of the upper rail relative to the lower rail is locked in the locked state.
JP 2001-138778 A

  In such a prior art lock mechanism, the lock pole rotatably mounted rotates and passes through the opening formed in the lower rail and the lock hole of the upper rail, so that both rails are only on one side in the longitudinal direction. It will be locked. In such a configuration, when a reverse force is generated on the lock pole, the locking of both rails may be released.

  In order to unlock both rails by reversing the lock pole, it is necessary to pull out one end from both the opening of the lower rail and the lock hole of the upper rail. However, if the lock pole is not properly held, it cannot penetrate the lock hole of the upper rail even if the lock pole rotates.

  Therefore, an object of the present invention is to provide a lock mechanism in which the locks of both rails are not released even if any inertial force acts on the two rails.

  Another object of the present invention is to provide the above-described locking device that is always properly held by the locking body that locks both rails being always located in the cutout portion of one rail.

  Furthermore, the other object of this invention is to provide the said locking device which can lock both rails by more stable and stronger holding force.

  Furthermore, the other object of this invention is to provide the said locking device which can perform locking and unlocking by simple operation.

  The locking mechanism of the present invention that achieves the above object includes an upper surface portion, an inner side surface portion that extends downward from both longitudinal sides of the upper surface portion, and an inner notch portion that is formed so as to face the lower ends of both inner side surface portions. And a second rail that slidably accommodates the first rail and extends upward from both sides in the longitudinal direction of the bottom surface portion. An outer side surface portion, a folded surface portion extending downward along the both inner side surface portions on the outer side of the first rail accommodated therein from the upper ends of the outer side surface portions, and a lower end of the folded surface portions And a second rail having an outer notch formed so as to face to the second rail.

  The locking mechanism has an upper surface having a through hole facing the upper surface portion below the upper surface portion of the first rail, and downward from both end portions on both sides of the upper surface along both inner side surface portions of the first rail. Can extend through the inner side of the first rail and the outer notch of the folded back surface of the second rail so as to move up and down. A lock body having lock teeth, a bottom surface provided with a through hole corresponding to the through hole on the top surface of the lock body, and extending vertically and upward from the front and rear end portions of the bottom surface to the inner side surface portion, A holding body having a front side surface and a rear side surface fixed to the lower side of the upper surface portion of the first rail, and holding the lock body so that the lock teeth can move up and down at a cutout portion on the inner side surface of the first rail; , Has an upper part and a lower part to move the lock body up and down The lower part passes through the through hole on the upper surface of the lock body and the through hole on the bottom surface of the holding body, and the upper part further corresponds to the through hole on the upper surface of the lock body. A guide rod that passes through a through hole provided in the upper surface of one rail, and a lower portion of the guide rod is wrapped between the upper surface of the lock body and the bottom surface of the holding body, so that the lock body is elastic with respect to the holding body. And an elastic member to be pushed up.

  When the lower end of the folded surface portion of the second rail is located above the lower end of the inner side surface portion of the first rail and the lock body is pushed up by the elastic member, the lock teeth of the lock body are notched on the inner notch on the inner side surface. On the guide rod that passes through the through hole provided in the upper surface of the first rail, so that the first rail and the second rail are locked. When the portion is pushed downward, the lock teeth of the lock body are lowered, but are located in the inner notch portion of the first rail, while exiting from the outer notch portion of the second rail. The lock between the first rail and the second rail is released.

  In the lock mechanism, the lock body and the guide rod may be integrated.

  The first and second rails may be an upper rail and a lower rail for a vehicle seat, respectively.

  The first rail may further include a folded portion that extends upward from the end portions of both inner side surfaces of the first rail between the outer surface portion and the folded surface portion of the second rail.

  The inner rail notch portion of the first rail extends from the inner side surface portion to the folded portion, and in a state where the lock body is pushed up by the elastic member, the lock teeth of the lock body are formed on the inner notch portion and the folded surface portion of the inner side surface. You may make it penetrate the outer notch part, and also penetrate the inner notch part extended from the inner side side part to the folding | returning part.

  Further, at least one of the front side surface and the rear side surface of the holding body may have the same shape as the cross-sectional shape of the first rail defined by the upper surface portion of the first rail and the both inner side surfaces.

  In the state where the lock body is pushed up by the elastic member, both lock teeth of the lock body pass through both inner notches on the inner side surface of the first rail, and further, both outer notches on the folded surface portion of the second rail. Since it penetrates the section, the both sides of the rail are locked, and the lock is not released even if any inertial force acts on the rail.

  In addition, since the holding body supports the lock teeth of the lock body so that it can move up and down at the inner notch portion of the first rail, the lock body is located in the inner notch portion of the first rail and is always held properly. The

  Furthermore, when the inner notch portion of the first rail extends from the inner side surface portion to the folded-back portion, the lock teeth of the lock body are in the state where the lock body is pushed up by the elastic member, and the inner notch portion on the inner side surface and It penetrates the outer notch part of the folded surface part and further penetrates the inner notch part extending from the inner side surface part to the folded part, thereby locking both rails with more stable and stronger holding force. be able to

  Furthermore, the lock can be released only by pressing the upper portion of the guide rod downward, and the lock can be performed only by releasing the press on the upper portion of the guide rod.

  An example in which the lock mechanism of the present invention is applied to a movable vehicle seat is shown in FIG. The seat itself is omitted to show the locking mechanism.

  The pair of upper rails 1 and 1 are fixed to the bottom of the seat. The lower rails 2, 2 that accommodate the upper rails 1, 1 so as to be relatively active are fixed to the floor via the legs 3. In order to release the lock of the rail by the lock mechanism described below, a lever 4 whose both ends are rotatably supported by the lower rail is provided between the rails.

  FIG. 2 shows an exploded perspective view of the locking mechanism 10 of the present invention. 3A, the upper rail 1 includes an upper surface portion 11, inner side surface portions 12 and 12 that extend downward from both longitudinal sides of the upper surface portion, and the inner side surface portion. It consists of folding | returning parts 13 and 13 extended upwards from a lower end.

  An inner notch portion 14 formed of three notches extending in the vertical direction is formed at each lower end of the inner side surface portion 12 where the lock mechanism described below is located. The number of notches is not limited to three. The number of notches can be changed as needed. The inner notch portion 14 also extends below the folded portion 13. Lock teeth described below are positioned in the inner notch 14 so as to be movable up and down. Further, a through hole 15 through which a guide rod described below passes is formed in the upper surface portion 11.

  The folding | returning part 13 has a shape which supports the retainer 4 holding the ball | bowl 3 for enabling the lower rail 2 and the upper rail 1 demonstrated below to move, and a ball | bowl.

  The upper rail 1 is slidably accommodated in a lower rail 2, and as shown in FIGS. 1, 3 (a) and 3 (b), the lower rail 2 has a bottom portion 21. And outer side surface portions 22, 22 extending upward from both longitudinal sides of the bottom surface portion 21, and both inner side surface portions on the outer side of the upper rail 1 accommodated therein from the upper ends of the both outer side surface portions 22, 22. 12 and 12 and folded surface portions 23 and 23 extending downward. As shown in FIG. 3A, the lower end of the folded surface portion 23 is located above the lower end of the inner side surface portion 12 of the upper rail 1.

  Outer cutout portions 24 and 24 formed of a plurality of cutouts are formed at the lower ends of the folded surface portions 23 and 23 so as to face each other. The outer notch 24 can be determined in accordance with the relative movement distance between the upper rail and the lower rail. The outer notch 24 extends below the outer folded portion 23. A lock tooth described below is positioned in the outer notch 24, and when the lock tooth is lowered, the outer notch 24 can come out of the outer notch 24.

  The folded portion 13 of the upper rail 1 is located between the outer side surface portion 22 of the lower rail 2 and the folded surface portion 23 and has a shape that supports the ball 3 and the retainer 4 as described above. In this embodiment, as shown in FIG. 3 (a), the lower corner portion 23a of the outer folded portion 23 and the lower corner portion 13a of the folded portion 13 hold the ball 3 and the retainer 4 between them. It has a shape that can be done. Similarly, the upper corner portion 23b of the outer folded portion 23 and the upper corner portion 13b of the folded portion 13 have a shape capable of holding the ball 3 and the retainer 4 between them.

  The lock mechanism 30 includes a lock body 31 and a holding body 40 that holds the lock body so as to be movable in the vertical direction, a guide rod 50 that guides the lock body 31 so as to be movable in the vertical direction, and a lock body. An elastic member 54 that elastically pushes 31 up against the holding body 40. In this embodiment, the lower outer corner portion 23a of the outer folded portion 23 and the lower inner corner portion 13a of the folded portion 13 have a shape that supports the retainer 4 that holds the gap between the balls 3 and the balls therebetween. Have. Similarly, the upper outer corner portion 23b of the outer folded portion 23 and the upper inner corner portion 13b of the folded portion 13 have a shape that supports the retainer 4 that holds the ball 3 and the space between the balls therebetween.

  The lock body 31 includes an upper surface 32 having a through hole 35 facing the upper surface portion below the upper surface portion 11 of the upper rail 1, and both inner side surface portions 12 of the upper rail 1 from both ends of the upper surface 32. 12, both side surfaces 33, 33 extending downward, respectively, extending outward from the lower ends of the both side surfaces, inner notches 14, 14 of both inner side surfaces 13, 13 of the upper rail 1, and folding of the lower rail 2 It has lock teeth 34 and 34 which can penetrate the outer side notches 24 and 24 of the surface parts 23 and 23 so that vertical movement is possible. At the tip of the lock tooth 34, there are three teeth corresponding to the three notches of the inner notch 14. The through hole 35 in the upper surface 32 corresponds to the through hole 15 in the upper rail 1.

  The holding body 40 includes a bottom surface 42 provided with a through-hole 45, a front side surface 43 and a rear side surface that extend vertically and upward from the front and rear end portions of the bottom surface to the inner side surface portions 12 and 12 of the upper rail 1. 43 '. The front side surface 43 and the rear side surface 43 ′ are fixed to the lower side of the upper surface portion 11 of the upper rail 1 with bolts B and B. As will be described below, the holding body 40 has the lock teeth 34 and 34 on the inner side of the upper rail 1. The lock body 31 can be held by the notches 14 and 14 of the side surfaces 12 and 12 so as to be vertically movable.

  The guide rod 50 has an upper portion 51 and a lower portion 52, and has a bulging portion 53 at the boundary between the upper portion 51 and the lower portion 52. The guide rod 50 has an upper portion 51 on the upper surface portion 11 of the upper rail 1 so that the lower portion 52 penetrates the through hole 35 on the upper surface 32 of the lock body 31 and the through hole 45 on the bottom surface 41 of the holding body 40. It arrange | positions so that the provided through hole 15 may be penetrated.

  The elastic member 54 surrounds the lower portion 52 of the guide rod 50 between the upper surface 32 of the lock body 31 and the bottom surface 42 of the holding body 40 and elastically pushes up the lock body 31 relative to the holding body 40. The elastic member is preferably a spring, but is not limited thereto and may be a rubber cylinder.

  The lock mechanism 30 is assembled as follows. First, the lower portion 52 of the guide rod 50 is passed through the through hole 35 of the lock body 31, further passed through the elastic member 54 and finally through the through hole 45 of the holding body 40. Next, the front side surface 43 and the rear side surface 43 ′ of the holding body 40 are connected to the upper surface of the upper rail 1 so that the upper portion 51 of the guide rod 50 passes through the through hole 15 provided in the upper surface portion 11 of the upper rail 1. It is fixed to the lower side of the part 11.

  Within the holding body 40, the lock body 31 is pushed up by the elastic member 54. The upper portion 51 of the guide rod 50 is pushed downward, and in this state, the folded portions 13 and 13 of the upper rail 1 are positioned between the outer side surface portions 22 and 22 of the lower rail 2 and the folded surface portions 23 and 23. Further, the retainer 4 positioned between the balls 3 is disposed, and the upper rail 1 is accommodated in the lower rail 2 while being slid with respect to the lower rail 2 (see FIG. 3B). When the pressure is released to the upper portion 51 of the guide rod 50 at an appropriate position, the lock body 31 is pushed upward by the elastic member 54 in the holding body 40, and the lock teeth 34 of the lock body 31 are moved to the upper rail 1. 3 moves upward in the inner notch 14 and enters the outer notch 24 of the lower rail 2 (FIG. 3A). Thus, the lock mechanism 30 is assembled, and the upper rail 1 and the lower rail 2 can be locked so as to slide and move.

Locking and Unlocking Operation Normally, as shown in FIG. 3A, the lock body 31 is pushed up against the holding body 40 by the elastic member 54. As shown in FIG. 1, when the lever 4 is pulled up, the L-shaped member provided at the rear end of the lever is pushed down, and the upper portion of the guide rod 50 is locked. Press 51 down. Since the guide rod 50 pushes down the lock body 31, the lock teeth 34 of the lock body 31 move downward within the cutout portion 14 of the upper rail 1. At the same time, the lock teeth 34 move downward in the notch 24 of the lower rail 2.

  Further, when the guide rod 50 is pushed down, the lower end of the folded surface portion 23 of the lower rail 2 is positioned above the lower end of the inner side surface portion 12 of the upper rail 1, so that the lock teeth 34 of the lock body 31 are connected to the upper rail 1. While located in the notch part 14, it comes out of the notch part 24 of the lower rail 2 (FIG.3 (b)). As a result, the lock between the upper rail 1 and the lower rail 2 is released, and the upper rail 1 can be slid and moved to a predetermined position with respect to the lower rail 2.

  When the upper rail 1 is moved to a predetermined position with respect to the lower rail 2 and then the lever 4 is lifted, the pressing to the guide rod 50 is released and the guide rod 50 is pushed upward by the elastic member 54. The lock teeth 34 of the lock body 31 in the holding body 40 still enter the cutout portion 24 of the lower rail 2 while moving in the cutout portion 14 of the upper rail 1. As a result, the upper rail 1 and the lower rail 2 can be locked.

  Since the lock teeth 34 of the lock body 31 in the holding body 40 are always positioned in the notch groove 14 of the upper rail 1 both when locked and when unlocked, they are always held properly. Further, the lock body 31 locks on both sides of the rail since both lock teeth 34, 34 are located in the notches 14, 14 of the upper rail 1 and the notches 24, 24 of the lower rail 2, respectively. Even if any inertial force acts on the rail, the lock is not released.

  If a peeling action occurs between the upper rail and the lower rail, the upper rail may be deformed. However, as shown in FIG. 3A, the shapes of the front side surface 43 and the rear side surface 43 ′ of the holding body 40 are formed. However, since it has the same shape as the cross section of the upper rail 1, such deformation can be prevented. However, in the application example so that the peeling action does not substantially occur, the shapes of the front side surface 43 and the rear side surface 43 ′ of the holding body 40 do not need to have the same shape as the cross section of the upper rail 1.

  In the illustrated embodiment, the lock body 31 and the guide rod 50 of the lock mechanism are separate, but may be constant. That is, the upper portion 51 may protrude from the upper side of the upper surface 32 of the lock body 31, and the lower portion 52 may protrude from the lower side of the upper surface 32 of the lock body 31.

  FIG. 4 shows another embodiment of the present invention. In this embodiment, the space between the inner side surface 12 of the upper rail 1 and the folded portion 13 is narrowed, the notch portion 14 is extended to the folded portion 13, and the lock teeth 34 of the lock body 31 extend to the folded portion 13. It passes through the notch. As a result, at the time of locking, the lock teeth 34 of the lock body 31 include the notch portion 14 on the inner side surface 12 of the upper rail 1, the notch portion 24 on the folding surface portion 23 of the lower rail, and the notch portion of the folding portion 13 of the upper rail 1. It can be extended to 14 so that both rails can be locked more stably and cooperatively with holding force.

  As shown in the embodiment, the locking mechanism of the present invention can be used to lock the rail that moves the seat, but is not limited to this, and the two rails that slide and move are locked. Can be applied to.

FIG. 1 is a perspective view of an upper rail and a lower rail for moving a seat incorporating the lock mechanism of the present invention. FIG. 2 is an exploded perspective view of the locking mechanism of the present invention. FIG. 3 (a) shows a cross-sectional view of the upper rail and the lower rail for moving the seat incorporating the lock mechanism of the present invention, and FIG. 3 (b) shows the lock mechanism in a state where the guide rod is pushed down. A cross-sectional view is shown. FIG. 4 is a cross-sectional view of an upper rail and a lower rail for moving a seat in which another embodiment of the lock mechanism of the present invention is incorporated.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st rail 2 2nd rail 3 Ball | bowl 4 Retainer 11 Upper surface part 12 Inner side surface part 14 Inner notch part 21 Bottom part 22 Outer side part 23 Folding surface part 24 Outer notch part 30 Lock mechanism 31 Locking body 32 Upper surface 33 Side surface 34 Lock teeth 35 Through hole 40 Holding body 42 Bottom surface 43 Front side surface 43 'Rear side surface 45 Through hole 50 Guide rod 51 Upper portion 52 Lower portion 53 Swelling portion 54 Elastic member

Claims (6)

An upper surface portion (11), inner side surface portions (12, 12) extending downward from both longitudinal sides of the upper surface portion, and inner notches (14, 14) formed so as to face the lower ends of both inner side surface portions. A first rail (1) having
A second rail (2) for slidably accommodating the first rail therein, the bottom surface portion (21) and an outer side surface portion extending upward from both longitudinal sides of the bottom surface portion (22, 22) and folded surface portions (23, 23) extending downward from the upper ends of the outer side surface portions to the inner side along the inner side surface portions outside the first rail accommodated therein. And a second rail (2) having outer notches (24, 24) formed so as to face the lower ends of the folded surface portions,
A locking mechanism (30) for locking
The locking mechanism is
An upper surface (32) having a through hole (35) facing the upper surface portion (11) of the first rail, and both inner side surface portions (12, 12) of the first rail from both ends of the upper surface. And both side surfaces (33, 33) extending downward, and extending from the lower ends of the both side surfaces to the outside, the inner rails (14, 14) of the first rail and the outer rails of the second rail. A lock body (31) having lock teeth (34, 34) capable of penetrating the portion so as to be vertically movable;
A bottom surface (42) provided with a through hole (45) corresponding to the through hole (35) on the upper surface of the lock body, and an upper side perpendicular to the inner side surface portion from the front and rear ends of the bottom surface And a front side surface (43) and a rear side surface (43 ') fixed to the lower side of the upper surface portion of the first rail, and the locking teeth are an inner notch portion of the first rail. (14, 14) a holding body (40) that holds the lock body so as to be vertically movable;
A guide rod (50) having an upper part (51) and a lower part (52) for guiding the vertical movement of the lock body, wherein the lower part is a through hole (35) of the lock body. Through the through hole (45) of the holding body, the upper portion further penetrates a through hole (15) provided in the upper surface portion of the first rail corresponding to the through hole on the upper surface of the lock body. A guide rod to
An elastic member that surrounds the lower portion (52) of the guide rod between the upper surface (32) of the lock body and the bottom surface (42) of the holding body, and elastically pushes up the lock body against the holding body ( 54)
Including
The lower end of the folded surface portion (23, 23) of the second rail is located above the lower end of the inner side surface portion (12, 12) of the first rail,
In a state where the lock body is pushed up by the elastic member, the lock teeth of the lock body are located through the inner notch portion (14) of the inner side surface and the outer notch portion (24) of the folded surface portion, As a result, the first rail and the second rail are locked, and the upper portion (51) of the guide rod passing through the through hole provided in the upper surface portion of the first rail is pushed downward. The locking teeth of the locking body are lowered, but are located within the inner notches (14, 14) of the first rail, while leaving the outer notches (24, 24) of the second rail. Thus, the lock between the first rail and the second rail is released. An upper surface portion (11), inner side surface portions (12, 12) extending downward from both longitudinal sides of the upper surface portion, and inner notches (14, 14) formed so as to face the lower ends of both inner side surface portions. A first rail (1) having
A second rail (2) for slidably accommodating the first rail therein, the bottom surface portion (21) and an outer side surface portion extending upward from both longitudinal sides of the bottom surface portion (22, 22) and folded surface portions (23, 23) extending downward from the upper ends of the outer side surface portions to the inner side along the inner side surface portions outside the first rail accommodated therein. And a second rail (2) having outer notches (24, 24) formed so as to face the lower ends of the folded surface portions,
A locking mechanism (30) for locking
The locking mechanism is
The upper surface (32) facing the upper surface portion below the upper surface portion (11) of the first rail, and both the inner side surface portions (12, 12) of the first rail from both ends of the upper surface. And both side surfaces (33, 33) extending downward, and extending from the lower ends of the both side surfaces to the outside, the inner rails (14, 14) of the first rail and the outer rails of the second rail. A lock body (31) having lock teeth (34, 34) capable of penetrating the portion so as to be vertically movable;
A bottom surface (42) provided with a through-hole (45), and a lower side of the upper surface portion of the first rail that extends vertically and upward from the front and rear end portions of the bottom surface to the inner side surface portion. A front side surface (43) and a rear side surface (43 ') that are fixed to each other, and the lock teeth hold the lock body so as to be vertically movable at the inner notches (14, 14) of the first rail. A holding body (40);
A guide rod (50) having an upper portion (51) and a lower portion (52) for guiding the vertical movement of the lock body, wherein the lower portion is below the upper surface (32) of the lock body. It protrudes from the side, passes through the through hole (45) of the bottom surface (42) of the holding body, and the upper portion protrudes from the upper surface of the lock body and is provided on the upper surface portion (11) of the first rail. A guide rod penetrating through the through-hole (15),
An elastic member that surrounds a lower portion of the guide rod between an upper surface of the lock body and a bottom surface of the holding body, and elastically pushes up the lock body against the holding body;
Including
The lower end of the folded surface portion (23, 23) of the second rail is located above the lower end of the inner side surface portion (12, 12) of the first rail,
In a state where the lock body is pushed up by the elastic member, the lock teeth of the lock body are located through the inner notch portion (14) of the inner side surface and the outer notch portion (24) of the folded surface portion, As a result, the first rail and the second rail are locked, and the upper portion (51) of the guide rod passing through the through hole provided in the upper surface portion of the first rail is pushed downward. The locking teeth of the locking body are lowered, but are located within the inner notches (14, 14) of the first rail, while leaving the outer notches (24, 24) of the second rail. Thus, the lock between the first rail and the second rail is released.   The lock mechanism according to claim 1 or 2, wherein the first and second rails are an upper rail and a lower rail for a vehicle seat, respectively.   The first rail has folded portions (13, 13) extending upward from the end portions of the inner side surfaces of the first rail between the outer surface portion and the folded surface portion of the second rail. The locking mechanism according to claim 1, further comprising: An inner notch (14, 14) of the first rail extends from the inner side surface to a folded portion (13, 13);
In a state where the lock body is pushed up by the elastic member, the lock teeth of the lock body pass through the inner notch portion of the inner side surface and the outer notch portion of the folding surface portion, and further from the inner side surface portion to the folded portion. 5. The locking mechanism according to claim 4, wherein the locking mechanism extends through an inner notch that extends into the heel.   A cross-sectional shape of the first rail, wherein at least one of the front side surface (43) and the rear side surface (43 ') of the holding body is defined by the upper surface portion of the first rail and the both inner side surfaces; The locking mechanism according to claim 1 or 2, which has the same shape.

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