JP7045168B2 - Seat lock mechanism - Google Patents

Description

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

As a seat provided in an automobile, there is a foldable seat that can be folded in half by tilting the seat back forward. The foldable seat is slidably mounted on a frame-shaped seat base. Some of such foldable seats are configured so that the seat base can be stood up on the floor in a further folded state, stored in a stepped portion of the floor, or removed. By making it possible to change the foldable seat from the seating position to another arrangement position, it is possible to improve the ease of getting on and off the vehicle and expand the luggage space. When using the foldable seat in the seated position, lock the seat base of the foldable seat to the specified seating position on the floor, and when changing the foldable seat to another position, the seat base with respect to the floor. unlock.

As a seat locking mechanism for fixing the seat base to the floor, for example, a locking device for an automobile seat of Patent Document 1 can be mentioned. The locking device (seat locking mechanism) of Patent Document 1 fixes the seat by engaging a striker immovably provided on the floor with a hook (first locking member) provided on the lower side of the seat. The hook is rotatably attached to one side of the bracket attached to the seat. The bracket is provided with a lock arm (second lock member) that engages with the hook so as to suppress the rotation of the hook engaged with the striker, and the engagement between the hook and the striker is released by the degree of vibration. It is designed not to be done. When unlocking the seat base, the lock arm is rotated to make the hook rotatable. In the locking device of Patent Document 1, an anchor fixing portion for fixing the seatbelt anchor is further provided on the bracket.

Jikkenhei 5-32098 Gazette

In a configuration in which an anchor fixing portion is provided on a bracket as in the seat lock mechanism of Patent Document 1, when a large tension acts on the seat belt anchor during sudden braking of a vehicle, a large load is applied to the hook (first lock member). There is a problem that it takes. To solve such a problem, Patent Document 1 provides a reinforcing material for reinforcing the tip of the hook that engages with the striker.

However, depending on the direction of the tension acting on the seatbelt anchor, stress may act on the bracket in the direction in which the bracket bends. In this case, a force that shifts the hook (first lock member) and the lock arm (second lock member) in the thickness direction of the hook acts, and both members may be in an improperly engaged state.

The present invention has been made in view of the above circumstances, and one of the purposes thereof is a sheet capable of suppressing an inappropriate engagement state between the first lock member and the second lock member with a simple configuration. To provide a locking mechanism.

The seat lock mechanism according to one aspect of the present invention is
A seat lock mechanism that fixes a seat base that is movable with respect to the floor of a vehicle to the floor.
The striker that is immovably installed on the floor,
The bracket attached to the seat base and
A first lock member that is rotatably supported on one side of the bracket and engages with the striker.
A second lock member that is rotatably supported on one surface side of the bracket and engages with the first lock member to suppress the rotation of the first lock member is provided.
The bracket is
The anchor fixing part where the seat belt anchor is fixed, and
It is provided with a holding portion that locally protrudes from one side of the bracket.
The pressing portion overlaps the engaging portion between the first locking member and the second locking member, and extends in a direction toward the anchor fixing portion.

By forming a presser portion on the bracket of the seat lock mechanism and arranging the presser portion so as to overlap the engaging portion between the first lock member and the second lock member, both lock members are prevented from being displaced in the thickness direction. Can be suppressed. This is because when the bracket bends, the pressing portion abuts on the engaging portion so as to press the engaging portion. In particular, since the presser part extends toward the anchor fixing part where the tension of the seat belt acts, when the bracket bends, the presser part tends to bend like the bracket, and both lock members are almost bent by the presser part. It is pressed evenly, and both lock members do not easily shift in the thickness direction.

In the seat lock mechanism, instead of thickening the bracket to make it difficult for the bracket to bend, the bracket is allowed to bend and the deviation of both lock members in the thickness direction is suppressed. Therefore, it is possible to suppress an increase in vehicle weight and an increase in material cost due to the thickening of the entire bracket.

It is a schematic block diagram of the seat lock mechanism shown in Embodiment 1. It is a partially enlarged view of FIG. FIG. 3 is a cross-sectional view taken along the line III-III of FIG.

Hereinafter, the seat lock mechanism of the present invention will be described with reference to FIGS. 1 to 3. In the figure, the same reference numerals indicate the same names.

<Embodiment 1>
≪Overall composition≫
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 front side of the vehicle, and the RR side is the rear side of the vehicle. FIG. 1 shows a state in which the seat base 2 is locked to the floor 9 by the seat lock mechanism 1. A foldable sheet (not shown) is provided on the seat base 2 via, for example, a slide mechanism shown by a two-dot chain line. The foldable seat is configured so that the seat back (backrest) falls toward the seat cushion (seat surface portion). 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 immovably provided on the floor 9. The striker 3 of this example is composed of a pair of vertical pieces 30 protruding from the floor 9 and separated in the vehicle width direction (paper depth direction), and a horizontal piece 31 connecting the upper ends of both vertical pieces 30. It has an inverted U shape. The first lock member 5, which will be described later, engages with the horizontal piece 31 of the striker 3. The shape and orientation of the striker 3 are not particularly limited. For example, the same inverted U-shaped striker 3 as in this example may be arranged with the inverted U-shaped opening facing the vehicle width direction.

≪Bracket≫
The bracket 4 is a flat plate-shaped member provided so as to hang down 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 holding portion 41, and an anchor fixing portion 47. These configurations provided in the bracket 4 will be described in detail when the members related to the configurations are described. In particular, the presser portion 41 is one of the important features of the seat lock mechanism 1 of the embodiment, and an item will be provided later to explain it again.

≪Seat belt≫
Among the members attached to the bracket 4, the configuration of the seat belt 7 that is not 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 seatbelt 7 is provided with a seatbelt anchor 70 at its end, and the seatbelt anchor 70 is fixed to the anchor fixing portion 47 of the bracket 4. The seatbelt anchor 70 is a flat plate-shaped member, and the anchor fixing portion 47 of this example is composed of a tightening shaft.

The seatbelt anchor 70 is pulled in the stretching direction of the seatbelt 7 (in the direction of the white arrow) when the seatbelt 7 is used. In this example, the stretching direction of the seatbelt 7 is such that the seatbelt 7 inclines toward the back of the paper surface as the distance from the seatbelt anchor 70 increases. Therefore, a force acts on the bracket 4 to which the seatbelt anchor 70 is fixed in the direction of bending toward the back side of the paper surface (see also the white arrows in FIG. 3).

≪First lock member≫
The first lock member 5 is a plate-shaped member that is rotatably supported on one side of the bracket 4 via a 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 of the bracket 4 on the bending direction side due to the seat belt 7. On the side of the first lock member 5 opposite to the bracket 4, a support plate 4B (see FIG. 3) for integrally handling the first lock member 5 and the second lock member 6 described later is provided. When attaching the first lock member 5 to the bracket 4, the first lock member 5 is attached to the bracket 4 together with the support plate 4B so that the first lock member 5 is sandwiched between the support plate 4B and the bracket 4.

The first lock member 5 includes a striker engaging recess 51 that engages with the lateral piece 31 of the striker 3 (see particularly FIG. 2). The seat base 2 is fixed to the floor 9 by engaging the striker engaging recess 51 with the striker 3. The first lock member 5 is connected to a second lock member 6 to be 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 paper surface about the rotation shaft 50. It is being pushed. 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 becomes movable with respect 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, which will be described later. The mutual engagement portion 55 is provided on the clockwise side (the side opposite to the urging direction of the first lock member 5) with respect to the striker engagement recess 51 in the first lock member 5.

≪Second lock member≫
As shown in FIG. 1, the second lock member 6 is a plate-shaped member rotatably supported on one side of the bracket 4 via a rotation shaft 60 inserted into the mounting hole 46 of the bracket 4. As described above, the second lock member 6 is treated 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.

As described above, the second lock member 6 is connected to the first lock member 5 via a tension spring. Therefore, as shown in FIG. 2, the second lock member 6 is urged in the clockwise direction (in the direction of the white arrow) on the paper surface around the rotation shaft 60. The second lock member 6 is formed with a convex mutual engagement portion 65 that engages with the concave mutual engagement portion 55 of the first lock member 5. By engaging the mutual engaging portion 65 of the second lock member 6 with the mutual engaging 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 an unlock member (wire 10 in this example) that rotates the second lock member 6 in a direction opposite to the urging direction (on paper, counterclockwise). The attachment portion 69 of the second lock member 6 to which the wire 10 is attached projects toward the bracket 4 side and penetrates the arc window 40 of the bracket 4. Therefore, the wire 10 is arranged on the front side of the paper surface with respect to the bracket 4. Further, the arc window 40 has an arc shape centered on the rotation shaft 60, and even if the second lock member 6 rotates, the mounting portion 69 does not get caught in the arc window 40. When the wire 10 is pulled, the second lock member 6 rotates counterclockwise, and the mutual engagement portions 55 and 56 are disengaged. As a result, the first lock member 5 rotates counterclockwise, and the first lock member 5 is disengaged 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 tilt of the seat back.

≪Presser part≫
In addition to the configuration described above, the seat lock mechanism 1 of this 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 engaging portion between the mutual engaging portion 55 of the first lock member 5 and the mutual engaging portion 65 of the second lock member 6. Further, the pressing portion 41 extends in a direction toward the anchor fixing portion 47 (see the thick arrow in FIG. 2). It is preferable that the anchor fixing portion 47 is penetrated when the end portion of the pressing portion 41 on the anchor fixing portion 47 side is virtually stretched. For example, the virtual line extending the end portion of the pressing portion 41 in this example coincides with the thick line arrow in FIG. 2 from the center of the inscribed circle of the mutual engaging portion 55 toward the center of the anchor fixing portion 47. The virtual line may be slightly deviated from the thick line arrow. For example, the virtual line may be deviated by about ± 10 ° from the thick line arrow.

By forming the pressing portion 41 on the bracket 4, it is possible to prevent the first locking member 5 and the second locking member 6 from being displaced in the thickness direction. As shown in FIG. 3, the displacement of the lock members 5 and 6 can be suppressed by engaging the lock members 5 and 6 when the bracket 4 is bent by being pulled by the seat belt 7 (FIG. 1). This is because the pressing portions 41 overlapping the locations press both the locking members 5 and 6 almost evenly. 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 tends to bend like the bracket 4 when the bracket 4 bends. , Both lock members 5 and 6 are pressed substantially evenly by the pressing portion 41. Therefore, both lock members 5 and 6 are unlikely to be displaced in the thickness direction, and it is possible to prevent the lock members 5 and 6 from being in an inappropriate engaging state.

Here, as shown in FIG. 1, the closer the seatbelt anchor 70 is to the anchor fixing portion 47 to which the seatbelt anchor 70 is fixed, the larger the amount of bending of the bracket 4. Therefore, it is preferable to form the holding portion 41 so that the protruding height becomes lower toward the anchor fixing portion 47. By doing so, it is easy to make the pressing amounts of both lock members 5 and 6 uniform by the pressing portion 41, and it is easy to suppress the deviation of both lock members 5 and 6.

The pressing portion 41 may have a structure integrated with the bracket 4, or may be retrofitted to the bracket 4, for example. As an example of the former, for example, a presser portion 41 may be formed on the bracket 4 by a die for producing the bracket 4 by press-molding a plate material. Examples of the latter include forming the holding portion 41 by joining the ridges by welding, and forming the holding portion 41 by welding beads. If it is a weld bead, the holding portion 41 can be formed on the existing bracket 4. Further, it is easy to change the protruding height of the holding portion 41 in the stretching direction.

As described above, in the seat lock mechanism 1 of this example, instead of thickening the bracket 4 to make it difficult for the bracket 4 to bend, the bracket 4 is allowed to bend, and then the thickness directions of both lock members 5 and 6 are allowed. The deviation is suppressed by the pressing portion 41. Therefore, it is possible to suppress an increase in vehicle weight due to the thickness of the entire bracket 4, an increase in cost due to an increase in the amount of material used, and a decrease in handleability.

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 Rotating shaft 51 Striker engaging recess 55 Mutual Engagement part 6 Second lock member 60 Rotating shaft 65 Mutual engagement part 69 Mounting part 7 Seatbelt 70 Seatbelt anchor 9 Floor 10 Wire

Claims (1)

A seat lock mechanism that fixes a seat base that is movable with respect to the floor of a vehicle to the floor.
The striker that is immovably installed on the floor,
The bracket attached to the seat base and
A first lock member that is rotatably supported on one side of the bracket and engages with the striker.
A second lock member that is rotatably supported on one surface side of the bracket and engages with the first lock member to suppress the rotation of the first lock member is provided.
The bracket is
The anchor fixing part where the seat belt anchor is fixed, and
A holding portion that protrudes locally from one surface side of the bracket and is close to the engagement portion between the first lock member and the second lock member is provided.
The pressing portion is a seat lock mechanism extending in a direction from a position overlapping the engaging portion toward the anchor fixing portion.

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