JP2019093781A - Seat lock mechanism - Google Patents

Abstract

To provide a seat lock mechanism which can inhibit an improper engagement state between a first lock member and a second lock member with a simple structure.SOLUTION: A seat lock mechanism 1 includes: a striker 3 provided on a floor 9 in an immovable manner; a bracket 4 attached to a seat base 2; a first lock member 5 which is rotatably supported at one surface side of the bracket 4 and engages with the striker 3; and a second lock member 6 which is rotatably supported at the one surface side of the bracket 4 and engages with the first lock member 5 to inhibit rotation of the first lock member 5. The bracket 4 includes: an anchor fixing part 47 to which a seat belt anchor 70 is fixed; and a pressing part 41 locally protruding from the one surface side of the bracket 4. The pressing part 41 overlaps with an engagement portion between the first lock member 5 and the second lock member 6 and extends in a direction toward the anchor fixing part 47.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a seat lock mechanism for fixing a seat provided in a vehicle such as a car to a floor.

  As a seat provided in a car, there is a foldable seat that can be folded in two by folding a seat back forward. The foldable seat is slidably mounted on the frame-like seat base. Among such foldable sheets, there are some which are configured to be able to stand up on the floor together with the seat base in a further folded state, to be stored in a stepped portion of the floor, and to be removed. By making it possible to change the reclining seat from the seating position to another arrangement position, it is possible to improve the getting on and off of the vehicle and to enlarge the cargo space. When using the folding seat in the seating position, the seat base of the folding seat is locked in a predetermined seating position of the floor, and when changing the folding seat to another arrangement position, the seat base relative to the floor unlock.

  As a seat lock mechanism which fixes the seat base mentioned above to a floor, the locking device of the seat for motor vehicles of patent documents 1 can be mentioned, for example. The lock device (sheet lock mechanism) of Patent Document 1 fixes the seat by engagement of a striker fixedly provided on the floor and a hook (first lock member) provided on the lower side of the seat. The hook is rotatably attached to one side of a bracket attached to the seat. The bracket is provided with a lock arm (second lock member) engaged with the hook so as to suppress rotation of the hook engaged with the striker, and the engagement between the hook and the striker is released in the vibration degree It is supposed not to be. When unlocking the seat base, the lock arm is pivoted to make the hook pivotable. Further, in the locking device of Patent Document 1, an anchor fixing portion to which the seat belt anchor is fixed is provided on the bracket.

Japanese Utility Model Application Publication No. 5-32098

  In the configuration in which the anchor fixing portion is provided on the bracket as in the seat lock mechanism of Patent Document 1, a large load acts on the hook (first lock member) when a large tension acts on the seat belt anchor at the time of sudden braking of the vehicle. There is a problem of this. In order to address such a problem, in Patent Document 1, a reinforcing material is provided to reinforce the tip of the hook engaged with the striker.

  However, depending on the direction of tension acting on the seat belt anchor, stress may act on the bracket in the direction in which the bracket bends. In this case, a force acts to shift the hook (first lock member) and the lock arm (second lock member) in the thickness direction of the hook, which may cause the two members to be in an inappropriate engagement state.

  The present invention has been made in view of the above circumstances, and one of its objects is to provide a seat which can suppress an inappropriate engagement between the first lock member and the second lock member with a simple configuration. It is to provide a locking mechanism.

The seat lock mechanism according to one aspect of the present invention is
A seat lock mechanism for securing a seat base configured to be movable with respect to a floor of a vehicle to the floor, the seat lock mechanism comprising:
A striker fixed to the floor,
A bracket attached to the seat base;
A first lock member rotatably supported on one side of the bracket and engaged with the striker;
And a second lock member rotatably supported on one side of the bracket and engaged with the first lock member to suppress rotation of the first lock member.
The bracket is
An anchor fixing portion to which a seat belt anchor is fixed;
And a pressing portion locally protruding from one surface side of the bracket;
The pressing portion overlaps the engagement portion between the first lock member and the second lock member, and is extended in the direction toward the anchor fixing portion.

  By forming a pressing portion on the bracket of the seat lock mechanism and arranging the pressing portion so as to overlap with the engagement portion between the first lock member and the second lock member, both lock members may be displaced in the thickness direction. It can be suppressed. This is because when the bracket is bent, the pressing portion abuts on the engagement point so as to press the engagement point. In particular, since the pressing portion extends toward the anchor fixing portion on which the tension of the seat belt acts, when the bracket is bent, the pressing portion is easily bent in the same manner as the bracket, and both locking members It is pressed uniformly and both lock members are hard to shift in the thickness direction.

  In the above-mentioned seat lock mechanism, instead of making the bracket thick to make it difficult to bend the bracket, after allowing the bending of the bracket, the shift in the thickness direction of both lock members is suppressed. Therefore, it is possible to suppress an increase in vehicle weight and an increase in material cost by thickening the entire bracket.

FIG. 2 is a schematic configuration view of a seat lock mechanism shown in the first embodiment. It is the elements on larger scale of FIG. It is the III-III sectional view of FIG.

  Hereinafter, the seat lock mechanism of the present invention will be described based on FIGS. In the figure, the same numerals show the same name thing.

First Embodiment
«Whole structure»
The seat lock mechanism 1 of the first embodiment will be described with reference to FIGS. 1 to 3. In FIGS. 1 to 3, the FR side indicated by the arrow is the vehicle front side, and the RR side is the vehicle rear side. FIG. 1 shows a state in which the seat base 2 is locked to the floor 9 by the seat lock mechanism 1. On the seat base 2, for example, a foldable seat (not shown) is provided via a slide mechanism indicated by a two-dot chain line. The foldable seat is configured such that the seat back (backrest) falls toward the seat cushion (seating surface). The seat lock mechanism 1 includes a striker 3 provided on the floor 9 side, a bracket 4 provided on the seat base 2 side, a first lock member 5 and a second lock member 6. Hereinafter, each component of the seat lock mechanism 1 will be described in detail.

«Striker»
The striker 3 is a rigid member fixed to the floor 9. The striker 3 of this example is provided with a pair of vertical pieces 30 protruding from the floor 9 and separated in the vehicle width direction (depth direction in the drawing) and a horizontal piece 31 connecting the upper ends of both vertical pieces 30. It has an inverted U-shape. The first locking member 5 described later is engaged with the lateral piece 31 of the striker 3. The shape and direction of the striker 3 are not particularly limited. For example, the striker 3 having the same inverted U-shape as that of this example may be disposed with the opening of the inverted U-shape directed in the vehicle width direction.

«Bracket»
The bracket 4 is a flat plate-like member provided so as to drop from the seat base 2. The bracket 4 is provided with a mounting hole 45 for rotatably mounting the first lock member 5 and a mounting hole 46 for rotatably mounting the second lock member 6. In addition, the bracket 4 is provided with an arc window 40, a pressing portion 41, and an anchor fixing portion 47. These configurations provided in the bracket 4 will be described in detail when describing the members related to the configuration. In particular, the pressing portion 41 is one of the important features of the seat lock mechanism 1 of the embodiment, and an item will be provided in the subsequent stage to explain again.

«Seat belt»
Among the members attached to the bracket 4, the configuration of the seat belt 7 that is not a member related to the function of the seat lock mechanism 1 but affects the configuration of the seat lock mechanism 1 will be described first. The seat belt 7 has a seat belt anchor 70 at its end, and the seat belt anchor 70 is fixed to the anchor fixing portion 47 of the bracket 4. The seat belt anchor 70 is a flat plate-like member, and the anchor fixing portion 47 in this example is constituted by a tightening shaft.

  The seat belt anchor 70 is pulled in the stretching direction of the seat belt 7 (in the direction of the white arrow) when the seat belt 7 is used. In the present embodiment, the extension direction of the seat belt 7 is inclined to the back side in the drawing as it is separated from the seat belt anchor 70. Therefore, a force is applied to the bracket 4 to which the seat belt anchor 70 is fixed in the direction of bending to the back side in the drawing (see the open arrow in FIG. 3).

«First lock member»
The first lock member 5 is a plate-like member rotatably supported on one surface side of the bracket 4 via the rotation shaft 50 inserted into the mounting hole 45 of the bracket 4. One surface of the bracket 4 on which the first lock member 5 is provided is a surface on the side in the bending direction of the bracket 4 by the seat belt 7. On the side opposite to the bracket 4 in the first lock member 5, a support plate 4B (see FIG. 3) for integrally handling the first lock member 5 and a second lock member 6 described later is provided. When the first lock member 5 is attached to the bracket 4, the first lock member 5 is attached to the bracket 4 together with the support plate 4B such that the first lock member 5 is sandwiched between the support plate 4B and the bracket 4.

  The first locking member 5 comprises a striker engagement recess 51 which engages with the cross piece 31 of the striker 3 (see in particular FIG. 2). The seat base 2 is fixed to the floor 9 by the striker engaging recess 51 engaging with the striker 3. The first lock member 5 is connected to a second lock member 6 described later by a tension spring (not shown), and is attached in a counterclockwise direction (in the direction of the white arrow in FIG. 2) on the sheet of FIG. It is powered. When the first lock member 5 rotates counterclockwise, the engagement between the first lock member 5 and the striker 3 is released, and the seat base 2 can move relative to the floor 9.

  The lock member 5 of this example further includes a concave mutual engagement portion 55 that engages with a second lock member 6 described later. The mutual engagement portion 55 is provided on the clockwise side of the striker engagement concave portion 51 of the first lock member 5 (opposite to the biasing direction of the first lock member 5).

«Second lock member»
As shown in FIG. 1, the second lock member 6 is a plate-like member rotatably supported on one surface side of the bracket 4 via the rotation shaft 60 inserted into the mounting hole 46 of the bracket 4. As described above, the second lock member 6 is handled integrally with the first lock member 5 by the support plate 4B (FIG. 3), and is attached to the bracket 4 together with the support plate 4B.

  The second locking member 6 is connected to the first locking member 5 via a tension spring, as described above. Therefore, as shown in FIG. 2, the second lock member 6 is biased in the clockwise direction (in the direction of the white arrow) on the paper surface around the rotation shaft 60. The second locking member 6 is formed with a convex interengaging portion 65 that engages with the concave interengaging portion 55 of the first locking member 5. When the mutual engagement portion 65 of the second lock member 6 engages with the mutual engagement portion 55 of the first lock member 5, the rotation of the first lock member 5 is prevented, and the seat base 2 is fixed to the floor 9. Is maintained.

  The second lock member 6 is further attached with a lock release member (in this example, the wire 10) for rotating the second lock member 6 in the direction opposite to the biasing direction (counterclockwise in the drawing). The attachment portion 69 of the second lock member 6 to which the wire 10 is attached protrudes to the side of the bracket 4 and penetrates the arc window 40 of the bracket 4. Therefore, the wire 10 is disposed closer to the paper surface than the bracket 4. Further, the arc window 40 has an arc shape centering on the rotation shaft 60, and the mounting portion 69 is not caught on the arc window 40 even when the second lock member 6 is rotated. As the wire 10 is pulled, the second lock member 6 rotates counterclockwise, and the engagement between the mutual engagement portions 55 and 56 is released. As a result, the first lock member 5 rotates counterclockwise, and the first lock member 5 is detached from the striker 3. The wire 10 may be connected to a lever operated by an occupant, or may be configured to be pulled in conjunction with the forward inclination of the seat back.

«Pressing part»
In addition to the configuration described above, the seat lock mechanism 1 of the present example includes a pressing portion 41 that locally protrudes from one surface of the bracket 4. The pressing portion 41 is provided so as to overlap the engagement portion between the mutual engagement portion 55 of the first lock member 5 and the mutual engagement portion 65 of the second lock member 6. Further, the pressing portion 41 is extended in a direction toward the anchor fixing portion 47 (see a thick arrow in FIG. 2). When the end on the anchor fixing portion 47 side of the pressing portion 41 is virtually extended, the anchor fixing portion 47 is preferably penetrated. For example, a virtual line obtained by extending the end of the pressing portion 41 in this example coincides with the thick arrow in FIG. 2 from the center of the inscribed circle of the mutual engagement portion 55 toward the center of the anchor fixing portion 47. The virtual line may be slightly deviated from the thick arrow, for example, the virtual line may be deviated by about ± 10 ° from the thick arrow.

  By forming the pressing portion 41 on the bracket 4, it is possible to suppress the first lock member 5 and the second lock member 6 from being displaced in the thickness direction. As shown in FIG. 3, when the bracket 4 is bent by being pulled by the seat belt 7 (FIG. 1), the engagement between the both locking members 5 and 6 is achieved, as shown in FIG. 3. This is because the pressing portion 41 overlapping the portion presses the both locking members 5 and 6 almost equally. In particular, in this example, since the pressing portion 41 extends toward the anchor fixing portion 47 on which the tension of the seat belt 7 acts, the pressing portion 41 is easily bent like the bracket 4 when the bracket 4 is bent. Both the lock members 5 and 6 are almost equally pressed by the pressing portion 41. Therefore, both the lock members 5 and 6 are hard to shift in the thickness direction, and it can be suppressed that the lock members 5 and 6 are in an improper engagement state.

  Here, as shown in FIG. 1, as the seat belt anchor 70 is closer to the anchor fixing portion 47 to which the seat belt anchor 70 is fixed, the amount of bending of the bracket 4 becomes larger. Therefore, it is preferable that the protrusion height of the pressing portion 41 be formed to be lower toward the anchor fixing portion 47. By doing so, the pressing amounts of the both lock members 5 and 6 can be easily aligned by the pressing portion 41, and the displacement of the both lock members 5 and 6 can be easily suppressed.

  For example, the pressing portion 41 may be integrated with the bracket 4 or may be attached to the bracket 4 later. As an example of the former, for example, forming the pressing portion 41 on the bracket 4 with a die at the time of press-forming a plate material to produce the bracket 4 can be mentioned. As an example of the latter, forming holding | suppressing part 41 by welding a protrusion, for example, and forming holding | suppressing part 41 by a welding bead are mentioned. In the case of a weld bead, the pressing portion 41 can be formed on the existing bracket 4. In addition, it is easy to change the protruding height of the pressing portion 41 in the extending direction.

  As described above, in the seat lock mechanism 1 of the present embodiment, the thickness direction of both the lock members 5 and 6 is allowed after the bending of the bracket 4 is allowed, instead of making the bracket 4 difficult to bend by thickening the bracket 4. Misalignment is suppressed by the pressing portion 41. Therefore, it is possible to suppress an increase in vehicle weight by thickening the entire bracket 4 and an increase in cost and a decrease in handleability due to an increase in the amount of material used.

DESCRIPTION OF SYMBOLS 1 Seat lock mechanism 2 Seat base 3 Striker 30 Vertical piece 31 Horizontal piece 4 Bracket 4B Support plate 40 Arc window 41 Presser part 45, 46 Mounting hole 47 Anchor fixing part 5 First lock member 50 Rotation shaft 51 Striker engagement concave part 55 Mutually Engaging portion 6 Second lock member 60 Rotating shaft 65 Mutual engaging portion 69 Mounting portion 7 Seat belt 70 Seat belt anchor 9 Floor 10 Wire

Claims (1)

A seat lock mechanism for securing a seat base configured to be movable with respect to a floor of a vehicle to the floor, the seat lock mechanism comprising:
A striker fixed to the floor,
A bracket attached to the seat base;
A first lock member rotatably supported on one side of the bracket and engaged with the striker;
And a second lock member rotatably supported on one side of the bracket and engaged with the first lock member to suppress rotation of the first lock member.
The bracket is
An anchor fixing portion to which a seat belt anchor is fixed;
And a pressing portion locally protruding from one surface side of the bracket;
The seat lock mechanism which overlaps with the engagement part of the first lock member and the second lock member and extends in a direction toward the anchor fixing portion.

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