Vehicle seats

Abstract

To provide a vehicle seat which can suppress rebound of a lock unit at the time of lifting a seat cushion.SOLUTION: A vehicle seat includes a restraining device for lifting a front end of a seat cushion. The restraining device has: a lock plate; an arm for swinging to a first lock position from a first initial position; and a lock unit swinging to a second lock position from a second initial position integrally with the arm. The rock unit has: a hook engaged with the lock plate at the second lock position; and a regulation member regulating swinging of the hook to the case by projecting toward the other of the case and the hook by energization force from one of the case and the hook.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to vehicle seats. [Background technology]

[0002] BACKGROUND ART In vehicle seats, restraint devices that lift the front of the seat cushion to prevent a seated occupant from sliding forward during a collision or sudden deceleration are known (see Patent Documents 1 and 2).

[0003] This restraint device lifts the seat cushion by swinging an arm arranged under the seat cushion upward using an inflator or the like. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 4781109 [Patent Document 2] Japanese Patent Publication No. 2020-63004 Summary of the Invention [Problem to be solved by the invention]

[0005] The restraint device described above has a stopper that prevents the arm from swinging beyond the position where the seat cushion is raised. However, when the arm hits the stopper and returns to its original position, the locking unit that locks the arm rebounds. As a result, the arm may not be locked quickly.

[0006] An object of one aspect of the present disclosure is to provide a vehicle seat that can suppress rebound of a lock unit when the seat cushion is lifted. [Means for solving the problem]

[0007] One aspect of the present disclosure is a vehicle seat (1) comprising a seat cushion (2), a cushion frame (4) that supports the seat cushion (2), and a restraint device (5) configured to lift a front end of the seat cushion (2).

[0008] The restraint device (5) includes a lock plate (52) fixed to the cushion frame (4), an arm (54) configured to swing about a first swing central axis (L1) from a first initial position to a first lock position where the seat cushion (2) is lifted, and a lock unit (56) configured to swing integrally with the arm (54) from a second initial position to a second lock position where the arm engages with the lock plate (52).

[0009] The lock unit (56) has a case (561) connected to the arm (54), a hook (562) held swingably around a second swing central axis (L2) parallel to the first swing central axis (L1) relative to the case (561) and configured to engage with the lock plate (52) from the outside in a direction perpendicular to the first swing central axis (L1) at the second lock position, and a regulating member (565) configured to protrude from one of the case (561) and the hook (562) toward the other of the case (561) and the hook (562) by a biasing force when the hook (562) engages with the lock plate (52), thereby regulating the swing of the hook (562) relative to the case (561).

[0010] With this configuration, when the hook (562) engages with the lock plate (52), the restricting member (565) functions to restrict the swing of the hook (562). This suppresses rebound of the lock unit (56) when the arm (54) rotates in the reverse direction. As a result, the arm (54) is quickly locked.

[0011] In one aspect of the present disclosure, the restricting member (565) may be configured to be held by the hook (562) and to protrude toward the case (561) when the hook (562) is engaged with the lock plate (52). This configuration increases the degree of freedom in designing the case (561).

[0012] In one embodiment of the present disclosure, the restricting member (565) may be configured to protrude in a direction parallel to the second oscillation central axis (L2). This configuration facilitates control of the distance between the hook (562) and the case (561) in the region where the restricting member (565) functions. This allows the restricting member (565) to function stably.

[0013] In one aspect of the present disclosure, the restricting member 565 may be a leaf spring. Such a configuration can reduce the number of parts and assembly steps of the lock unit 56.

[0014] In one aspect of the present disclosure, the restricting member (565) may include an acting portion (565A) configured to restrict the swinging of the hook (562) at its side and to be pressed toward the inside of the hook (562) by the case (561), and a holding portion (565C) curved in a U-shape and press-fitted into an opening (562B) provided in the hook (562) in a direction parallel to the plate surface. This configuration facilitates installation of the restricting member (565). Furthermore, the strength of the restriction on the swinging of the hook (562) can be easily adjusted by changing the width of the acting portion (565A).

[0015] Note that the symbols in the parentheses above are examples showing the correspondence with the specific configurations, etc. described in the embodiments described below, and the present disclosure is not limited to the specific configurations, etc. shown by the symbols in the parentheses above. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 1 is a schematic side view showing a vehicle seat according to an embodiment. [Figure 2]FIG. 2 is a schematic side view showing an operating state of the restraint device in the vehicle seat of FIG. [Figure 3] 3 is a schematic perspective view of the restraint device of FIG. 2. FIG. [Figure 4] 4A is a schematic side view showing the arm and first lock unit in the restraint device of FIG. 2 in an initial position, and FIG. 4B is a schematic side view showing the arm and first lock unit in the restraint device of FIG. 2 in a locked position. [Figure 5] 5 is a schematic exploded perspective view of a first locking unit in the restraint device of FIG. 2. FIG. [Figure 6] 6 is a schematic perspective view of a hinge pipe, an arm, a first lock unit, and a second lock unit in the restraint device of FIG. 2. FIG. [Figure 7] 7A is a schematic perspective view of the restricting member in the first lock unit of FIG. 5, and FIG. 7B is a schematic side view showing the restricting member of FIG. 7A attached to the first hook. [Figure 8] 8A and 8B are schematic side views showing state changes of the first hook in the restraint device of FIG. 2. FIG. [Figure 9] 9A is a schematic perspective view showing the first lock unit of FIG. 5 in a second initial position, and FIG. 9B is a schematic cross-sectional view showing the state of the restricting member of the first lock unit of FIG. 9A. [Figure 10] 10A is a schematic perspective view showing the first lock unit of FIG. 5 in a second lock position, and FIG. 10B is a schematic cross-sectional view showing the state of the restricting member of the first lock unit of FIG. 10A. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, embodiments to which the present disclosure is applied will be described with reference to the drawings. [1. First embodiment] [1-1.Configuration] The vehicle seat 1 shown in FIG. 1 includes a seat cushion 2, a seat back 3, a cushion frame 4, and a restraint device 5.

[0018] The vehicle seat 1 is used as a seat for a passenger vehicle. Note that the directions in the following description and in each drawing refer to directions when the vehicle seat 1 is assembled to the vehicle (i.e., the passenger vehicle). In this embodiment, the width direction of the seat coincides with the left-right direction of the vehicle, and the front of the seat coincides with the front of the vehicle.

[0019] The seat cushion 2 is a portion for supporting the buttocks of a seated person. The seat back 3 is a portion for supporting the back of a seated person. The cushion frame 4 supports the seat cushion 2.

[0020] <Restraint Device> Restraint device 5 prevents the seated occupant from sliding forward when a large acceleration occurs in the vehicle in which vehicle seat 1 is installed due to a collision, sudden stop, or the like.

[0021] The restraint device 5 is configured to receive power generated by, for example, an inflator to lift the front end of the seat cushion 2. The inflator applies inertial force to the restraint device 5 to activate it when a certain amount of acceleration is detected in the vehicle.

[0022] The restraint device 5 is displaced by inertial force from the inactive state shown in Fig. 1 to the active state shown in Fig. 2. The restraint device 5 in the active state pushes up the front end of the seat cushion 2.

[0023] As shown in FIG. 3, the restraint device 5 has a fixed portion 51, a first locking plate 52, a hinge pipe 53, an arm 54, an arm pipe 55, a first locking unit 56, a second locking plate 57, and a second locking unit 58.

[0024] <Fixed part> The fixed portion 51 is fixed to the cushion frame 4 by, for example, fastening. The fixed portion 51 does not move relative to the seat cushion 2.

[0025] <First lock plate> The first lock plate 52 is fixed to the cushion frame 4 via a fixing portion 51 .

[0026] The first lock plate 52 is fixed to the fixed portion 51 from the outer side in the seat width direction (specifically, the left side) by, for example, welding. The first lock plate 52 is disposed between the arm 54 and the fixed portion 51 in the seat width direction.

[0027] 4A, the first lock plate 52 has a plate body 521, an engaged portion 522, and an arm stopper 523. The thickness direction of the first lock plate 52 is parallel to the seat width direction.

[0028] The plate main body 521 has an arc-shaped side surface centered on the first swing central axis L1 when viewed in the thickness direction. The side surface of the plate main body 521 guides the tip end 562A of the first hook 562 toward the engaged portion 522 when the restraint device 5 is activated (i.e., when the first lock plate 52 swings). The hinge pipe 53 is inserted through the plate main body 521. The plate main body 521 forms a bearing for the hinge pipe 53.

[0029] Engaged portion 522 is provided at the end (i.e., the front end) of plate main body 521 in swing direction S of first locking unit 56. Engaged portion 522 is configured to be engaged with tip end 562A of first hook 562 when first locking unit 56 is in the second lock position shown in FIG.

[0030] The arm stopper 523 is provided on the end (i.e., rear end) of the plate main body 521 opposite to the engaged portion 522. The arm stopper 523 is configured so that the arm 54 comes into contact with it from above when the arm 54 swings past the first lock position shown in Fig. 4B. When the arm 54 comes into contact with the arm stopper 523, it swings toward the front of the seat due to the reaction force.

[0031] <Hinge pipe> The hinge pipe 53 shown in FIG. 3 connects the arm 54, the first lock unit 56, and the second lock unit 58 to the fixed portion 51 so that the arm 54, the first lock unit 56, and the second lock unit 58 are swingable.

[0032] Specifically, the hinge pipe 53 is inserted through the fixed portion 51, the first lock plate 52, and the second lock plate 57 with its central axis oriented parallel to the seat width direction. The hinge pipe 53 is axially rotatable relative to the fixed portion 51, the first lock plate 52, and the second lock plate 57. In addition, an arm 54, a first lock unit 56, and a second lock unit 58 are fixed to the hinge pipe 53.

[0033] <Arm> The arm 54 is configured to swing about a first swing central axis L1 from a first initial position (see FIG. 4A) to a first lock position (see FIG. 4B) that lifts the seat cushion 2. When power is applied from below by, for example, an inflator, the arm 54 swings upward due to inertial force.

[0034] The arm 54 is joined to the hinge pipe 53 by, for example, welding. The arm 54 extends in a direction away from the central axis of the hinge pipe 53 (i.e., the first swing central axis L1). Specifically, in the first initial position, the arm 54 extends from the hinge pipe 53 toward the front and upper side of the seat.

[0035] <Arm pipe> The arm pipe 55 is fixed to the tip of the arm 54 (i.e., the end opposite to the end connected to the hinge pipe 53). The arm pipe 55 is a reinforcing member that pushes up the seat cushion 2. The central axis of the arm pipe 55 is parallel to the seat width direction.

[0036] <First lock unit> The first lock unit 56 has the function of holding the arm 54 in the first lock position. The first lock unit 56 is disposed on the opposite side of the arm 54 across the first swing central axis L1, and is configured to swing integrally with the arm 54 from a second initial position (see FIG. 4A) to a second lock position (see FIG. 4B) where the first lock unit 56 engages with the first lock plate 52.

[0037] That is, the first locking unit 56 is in the second initial position when the arm 54 is in the first initial position. The first locking unit 56 is in the second locking position when the arm 54 is in the first locking position. The first locking unit 56 swings downward and toward the front of the seat from the second initial position.

[0038] As shown in FIG. 5, the first locking unit 56 has a first case 561, a first hook 562, a hinge pin 563, an elastic body 564, and a restricting member 565.

[0039] The first case 561 houses the first hook 562. The first case 561 has a first member 5611 and a second member 5612 that sandwich the first hook 562 in the seat width direction. The first member 5611 is disposed on the outer side of the first hook 562 in the seat width direction. The second member 5612 is disposed on the inner side of the first hook 562 in the seat width direction.

[0040] 6, the first member 5611 is connected to the hinge pipe 53 by, for example, welding. Also, as shown in Fig. 5, the first member 5611 has a hook stopper 561A that restricts the swing of the tip end 562A of the first hook 562 in a direction away from the first swing central axis L1.

[0041] The hook stopper 561A is formed by a portion of the side wall of the first member 5611 that covers the tip end portion 562A from the outside in a direction perpendicular to the first swing central axis L1 (that is, in the radial direction of the hinge pipe 53).

[0042] When the first case 561 swings, even if the first hook 562 swings in a direction in which the tip end 562A moves away from the first swing central axis L1, the swing of the first hook 562 stops when the tip end 562A comes into contact with the hook stopper 561A.

[0043] Furthermore, the first member 5611 has a first protrusion opening 561B provided in the outer wall facing the first hook 562. The second member 5612 has a second protrusion opening 561C provided in the outer wall facing the first hook 562.

[0044] The first hook 562 is a plate-shaped member held so as to be swingable around a second swing central axis L2 parallel to the first swing central axis L1 relative to the first case 561. The thickness direction of the first hook 562 is parallel to the first swing central axis L1.

[0045] The first hook 562 is configured to engage with the first lock plate 52 from the outside in a direction perpendicular to the first swing central axis L1 at the second lock position (see FIG. 4B). The first hook 562 further swings relative to the first case 561 inside the first case 561, which swings relative to the first lock plate 52.

[0046] The hinge pin 563 swingably connects the first hook 562 to the first case 561. The central axis of the hinge pin 563 (that is, the second swing central axis L2) is parallel to the seat width direction.

[0047] The elastic body 564 is a coil spring that biases the first hook 562 in a direction to engage with the first lock plate 52. The elastic body 564 is arranged inside the first case 561 in a state where it is wound around the hinge pin 563.

[0048] A first end of the elastic body 564 is fixed to the first hook 562. A second end of the elastic body 564 is fixed to the first case 561. The elastic body 564 biases the tip end 562A of the first hook 562 toward the first oscillation central axis L1.

[0049] Restriction member 565 is a leaf spring held by first hook 562. As shown in Fig. 7A, restriction member 565 is formed by bending a single metal plate. Restriction member 565 has first acting portion 565A, second acting portion 565B, and holding portion 565C.

[0050] The first acting portion 565A and the second acting portion 565B are tongue-shaped portions that face each other in the thickness direction of the first hook 562. The first acting portion 565A and the second acting portion 565B are arranged so that their thickness directions intersect with the first swing central axis L1, and are displaced in a direction parallel to the first swing central axis L1 by elastic force. The restricting member 565 elastically deforms so that the distance between the first acting portion 565A and the second acting portion 565B along the first swing central axis L1 changes.

[0051] The holding portion 565C is a strip-shaped portion having a plate surface parallel to the first oscillation central axis L1. The holding portion 565C connects the first action portion 565A and the second action portion 565B in a direction parallel to the first oscillation central axis L1.

[0052] The holding portion 565C extends in a direction perpendicular to the first oscillation central axis L1. Both end portions of the holding portion 565C in the extension direction are bent in directions facing each other. Therefore, the holding portion 565C is curved in a U-shape.

[0053] 7B, the restricting member 565 is inserted into the opening 562B of the first hook 562. The opening 562B is a space that penetrates the thickness direction of the first hook 562. The shape of the opening 562B when viewed from the thickness direction of the first hook 562 is T-shaped.

[0054] The holding portion 565C of the restricting member 565 is press-fitted into the opening 562B in a direction parallel to the plate surface of the holding portion 565C (i.e., the width direction). Specifically, the holding portion 565C is held in the opening 562B by having both ends in the extension direction compressed inward by the inner surfaces of the opening 562B. The first acting portion 565A and the second acting portion 565B are held by the holding portion 565C so as to be displaceable within the opening 562B.

[0055] 8 is a diagram illustrating the displacement of the first hook 562. Of the lines representing the first hook 562, the solid line indicates the position of the first hook 562 when the first lock unit 56 is in the second initial position.

[0056] The two-dot chain line indicates the position of the first hook 562 when it is engaged with the first lock plate 52 with the first lock unit 56 in the second lock position. The dashed line indicates the position of the first hook 562 before it engages with the first lock plate 52 with the first lock unit 56 reaching the second lock position.

[0057] The distance between the first swing central axis L1 and the center of gravity G of the first hook 562 is greater than the distance between the first swing central axis L1 and the second swing central axis L2. This relationship holds regardless of the positions of the first lock unit 56 and the first hook 562.

[0058] Therefore, when the first locking unit 56 swings from the second initial position toward the second locking position, the first locking unit 56 is biased by the mass inertia force I generated at the center of gravity G of the first hook 562. As a result, the arm 54 is also biased to swing.

[0059] Furthermore, the distance between the tip 562A of the first hook 562 and the center of gravity G of the first hook 562 is greater than the distance between the tip 562A and the second swing central axis L2. Therefore, when the first lock unit 56 swings from the second initial position toward the second lock position, the tip 562A is urged toward the first swing central axis L1 by inertial force (i.e., centrifugal force).

[0060] While the first locking unit 56 swings from the second initial position toward the second locking position, the tip 562A of the first hook 562 swings while being pressed against the side of the plate main body 521 of the first locking plate 52 due to the above-mentioned inertial force and the biasing force of the elastic body 564.

[0061] When the first lock unit 56 swings to the second lock position, the tip end 562A swings around the second swing central axis L2 from the position indicated by the dashed line to the position indicated by the two-dot chain line in Fig. 8. As a result, the tip end 562A engages with the engaged portion 522 of the first lock plate 52.

[0062] In the locked state, the tip end 562A comes into contact with the engaged portion 522 so as to overlap it from above. The angle formed by the input direction D1 of the locking load at the engagement point between the tip end 562A and the engaged portion 522 and the input direction D2 of the tilting load that causes the arm 54 to return to the first initial position under its own weight (i.e., to tip over) is 45° or less. Therefore, release of the lock due to the input of the tilting load is suppressed.

[0063] As shown in FIG. 9A, when the first lock unit 56 is in the second initial position (i.e., when the first hook 562 is not engaged with the first lock plate 52), the regulating member 565 does not overlap with the first protrusion opening 561B and the second protrusion opening 561C of the first case 561 in the seat width direction.

[0064] Therefore, as shown in FIG. 9B, the first acting portion 565A and the second acting portion 565B of the regulating member 565 are pressed toward the inside of the first hook 562 (i.e., in the direction in which the distance between them becomes smaller) by the first member 5611 or the second member 5612.

[0065] In this manner, when the first hook 562 is not engaged with the first lock plate 52, the first acting portion 565A and the second acting portion 565B are urged toward the outside of the first case 561 by an elastic force.

[0066] As shown in FIG. 10A, when the first hook 562 swings in the first case 561 at the second lock position and engages with the first lock plate 52, the restricting member 565 moves to a position overlapping with the first protrusion opening 561B and the second protrusion opening 561C.

[0067] 10B, the pressure applied to the first acting portion 565A and the second acting portion 565B by the first case 561 is released. This causes the first acting portion 565A to protrude from the first protrusion opening 561B in a direction parallel to the second oscillation central axis L2 (specifically, to the left). At the same time, the second acting portion 565B protrudes from the second protrusion opening 561C in a direction parallel to the second oscillation central axis L2 (specifically, to the right).

[0068] The first acting portion 565A protrudes to a position where it contacts a surface of the inner surface of the first protrusion opening 561B that intersects with the circumferential direction of the hinge pin 563. The second acting portion 565B protrudes to a position where it contacts a surface of the inner surface of the second protrusion opening 561C that intersects with the circumferential direction of the hinge pin 563.

[0069] Therefore, when the first hook 562 swings away from the first locking plate 52, the side surfaces of the first acting portion 565A and the second acting portion 565B come into contact with the inner surfaces of the first protrusion opening 561B and the second protrusion opening 561C, thereby restricting the swinging of the first hook 562.

[0070] In other words, the regulating member 565 is configured to restrict the swinging of the first hook 562 relative to the first case 561 by protruding from the first hook 562 toward the first case 561 due to the biasing force when the first hook 562 engages with the first locking plate 52.

[0071] <Second lock plate> The second lock plate 57 shown in FIG. 3 is disposed apart from the first lock plate 52 along the first swing central axis L1, and is fixed to the cushion frame 4 via a fixing portion 51.

[0072] The second lock plate 57 is fixed to the fixed portion 51 by welding, for example, from the outer side in the seat width direction (specifically, the right side), opposite the first lock plate 52. The second lock plate 57 is disposed between the arm 54 and the fixed portion 51 in the seat width direction. The shape of the second lock plate 57 is the same as that of the first lock plate 52.

[0073] <Second lock unit> The second lock unit 58 has the function of holding the arm 54 in the first lock position together with the first lock unit 56 .

[0074] The second lock unit 58 is positioned on the opposite side of the arm 54 across the first swing center axis L1, and is configured to swing integrally with the arm 54 from the third initial position to the third lock position where it engages with the second lock plate 57.

[0075] That is, the second locking unit 58 is in the third initial position when the arm 54 is in the first initial position, and the second locking unit 58 is in the third locking position when the arm 54 is in the first locking position.

[0076] 6, second lock unit 58 has a second case 581, a second hook 582, and a hinge pin 583. Second lock unit 58 is obtained by flipping first lock unit 56 left and right.

[0077] Therefore, the second case 581 is connected to the arm 54 via the hinge pipe 53, similar to the first case 561. The second hook 582 is held swingably around a third swing central axis L3 parallel to the first swing central axis L1 relative to the second case 581, and is configured to engage with the second lock plate 57 from the outside in a direction perpendicular to the first swing central axis L1 at the third lock position.

[0078] [1-2.Effects] According to the embodiment described above in detail, the following effects can be obtained. (1a) When the first hook 562 engages with the first lock plate 52, the restricting member 565 functions to restrict the swing of the first hook 562. This suppresses rebound of the first lock unit 56 when the arm 54 rotates in the reverse direction. As a result, the arm 54 is quickly locked.

[0079] (1b) The restriction member 565 is held by the first hook 562, which increases the degree of freedom in designing the first case 561.

[0080] (1c) By having the restricting member 565 protrude in a direction parallel to the second oscillation central axis L2, it becomes easier to manage the distance between the first hook 562 and the first case 561 in the area where the restricting member 565 functions. Therefore, the restricting member 565 can function stably.

[0081] (1d) Since the restricting member 565 is a leaf spring, the number of parts and the number of assembly steps for the first lock unit 56 can be reduced. (1e) The restricting member 565 can be easily attached by being press-fitted into the opening 562B of the first hook 562. Furthermore, the restricting strength against the swinging of the first hook 562 can be easily adjusted by changing the width of the acting portions 565A and 565B.

[0082] 2. Other Embodiments Although the embodiments of the present disclosure have been described above, it goes without saying that the present disclosure is not limited to the above-described embodiments and can take on various forms.

[0083] (2a) In the vehicle seat of the above embodiment, the restricting member does not necessarily have to protrude from the hook to both sides in the seat width direction. For example, the restricting member may be configured to protrude only to the outside in the seat width direction.

[0084] Furthermore, the regulating member does not necessarily have to be a leaf spring. For example, the regulating member may be composed of a coil spring and a pin or plate connected to the coil spring. Furthermore, the regulating member does not necessarily have to protrude in a direction parallel to the second swing central axis (i.e., the seat width direction). For example, the regulating member may be configured to protrude in a direction perpendicular to the second swing central axis (i.e., the radial direction of the hinge pin).

[0085] (2b) In the vehicle seat of the above embodiment, the restricting member may be configured to be held by the case and to protrude toward the case with the hook engaged with the lock plate.

[0086] (2c) In the vehicle seat of the above embodiment, if the hook can be engaged with the lock plate by inertial force, the lock unit does not necessarily have to have an elastic body that biases the hook.

[0087] (2d) In the vehicle seat of the above embodiment, the restraint device does not necessarily have to include the second lock plate and the second lock unit.

[0088] (2e) The vehicle seat of the above embodiment can also be applied to seats used in automobiles other than passenger cars, and seats used in vehicles other than automobiles, such as railway cars, ships, and aircraft.

[0089] (2f) The function of one component in the above embodiments may be distributed among multiple components, or the functions of multiple components may be integrated into one component. Also, part of the configuration of the above embodiments may be omitted. Furthermore, at least part of the configuration of the above embodiments may be added to or substituted for the configuration of another of the above embodiments. All aspects included in the technical idea identified by the wording of the claims are embodiments of the present disclosure. [Explanation of symbols]

[0090] 1...vehicle seat, 2...seat cushion, 3...seat back, 4... cushion frame, 5... restraint device, 51... fixing part, 52...first lock plate, 53...hinge pipe, 54...arm, 55...arm pipe, 56...first lock unit, 57...second lock plate, 58... second lock unit, 521... plate body, 522... engaged portion, 523...arm stopper, 561...first case, 561A...hook stopper, 561B, 561C...protrusion opening, 562...first hook, 562A...tip portion, 562B...opening, 563...hinge pin, 564...elastic body, 565...regulating member, 565A...first action part, 565B...second action part, 565C...holding part, 5611...first member, 5612...second member.

Claims

1. Seat cushion and a cushion frame supporting the seat cushion; a restraint device configured to lift a front end of the seat cushion; Equipped with The restraint device a lock plate fixed to the cushion frame; an arm configured to swing about a first swing center axis from a first initial position to a first lock position that lifts the seat cushion; a lock unit configured to swing integrally with the arm from a second initial position to a second lock position where the lock unit engages with the lock plate; and The lock unit is a case connected to the arm; a hook that is held to be swingable about a second swing central axis parallel to the first swing central axis relative to the case, and that is configured to engage with the lock plate from outside in a direction perpendicular to the first swing central axis at the second lock position; a restricting member configured to protrude in a direction parallel to the second swing central axis, and configured to restrict the swing of the hook relative to the case by protruding from one of the case and the hook toward the other of the case and the hook due to a biasing force when the hook engages with the lock plate; A vehicle seat having:

2. Seat cushion and a cushion frame supporting the seat cushion; a restraint device configured to lift a front end of the seat cushion; Equipped with The restraint device a lock plate fixed to the cushion frame; an arm configured to swing about a first swing center axis from a first initial position to a first lock position that lifts the seat cushion; a lock unit configured to swing integrally with the arm from a second initial position to a second lock position where the lock unit engages with the lock plate; and The lock unit is a case connected to the arm; a hook that is held to be swingable about a second swing central axis parallel to the first swing central axis relative to the case, and that is configured to engage with the lock plate from outside in a direction perpendicular to the first swing central axis at the second lock position; a restricting member configured to restrict swinging of the hook relative to the case by protruding from one of the case and the hook toward the other of the case and the hook due to a biasing force when the hook engages with the lock plate; and the restricting member is a leaf spring, an action portion configured to restrict the swing of the hook at a side surface and to be pressed toward the inside of the hook by the case; a holding portion that is curved in a U-shape and press-fitted into an opening provided in the hook in a direction parallel to the plate surface; A vehicle seat having:

3. Seat cushion and a cushion frame supporting the seat cushion; a restraint device configured to lift a front end of the seat cushion; Equipped with The restraint device a lock plate fixed to the cushion frame; an arm configured to swing about a first swing center axis from a first initial position to a first lock position that lifts the seat cushion; a lock unit configured to swing integrally with the arm from a second initial position to a second lock position where the lock unit engages with the lock plate; and The lock unit is a case connected to the arm; a hook that is held to be swingable about a second swing central axis parallel to the first swing central axis relative to the case, and that is configured to engage with the lock plate from outside in a direction perpendicular to the first swing central axis at the second lock position; a restricting member configured to restrict swinging of the hook relative to the case by protruding from one of the case and the hook toward the other of the case and the hook due to a biasing force when the hook engages with the lock plate; and A vehicle seat, wherein a distance between the first swing central axis and a center of gravity of the hook is longer than a distance between the first swing central axis and the second swing central axis.

4. The vehicle seat according to any one of claims 1 to 3, The vehicle seat is configured so that the restricting member is held by the hook and protrudes toward the case when the hook is engaged with the lock plate.

5. The vehicle seat according to claim 2 or 3, The vehicle seat is configured so that the restricting member protrudes in a direction parallel to the second swing central axis.

6. The vehicle seat according to claim 1 or 3, The vehicle seat, wherein the restricting member is a leaf spring.

7. 7. The vehicle seat according to claim 6, The regulating member is an action portion configured to restrict the swing of the hook at a side surface and to be pressed toward the inside of the hook by the case; a holding portion that is curved in a U-shape and press-fitted into an opening provided in the hook in a direction parallel to the plate surface; A vehicle seat having:

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