WO2017203939A1

WO2017203939A1 - Vehicle seat

Info

Publication number: WO2017203939A1
Application number: PCT/JP2017/017080
Authority: WO
Inventors: 隆志松井
Original assignee: 株式会社タチエス
Priority date: 2016-05-25
Filing date: 2017-04-28
Publication date: 2017-11-30
Also published as: JPWO2017203939A1; JP6651617B2

Abstract

The purpose of the present invention is to provide a vehicle seat that is able to execute a seat back raising operation with a small operating force and to reliably lock the seat back at an initial locking position when the seat back raising operation is executed. In order to solve this problem: an assist mechanism (30) is provided between a seat back (14) and a support base section (19) for the purpose of imparting to the seat back (14) a biasing force in a forward tilting direction; the assist mechanism (30) imparts a biasing force to the seat back at the rearward tilting side of the seat back (14) relative to an initial locking position (LA) where a reclining mechanism is locked initially when the seat back (14) is raised from a forward tilting state, and cancels the biasing force imparted to the seat back (14) at the forward tilting side of the seat back (14) relative to the initial locking position (LA); and a biasing force canceling position, where the biasing force being applied to the seat back (14) is to be canceled, is set at the rearward tilting side of the seat back (14) relative to the initial locking position (LA).

Description

Vehicle seat

The present invention relates to a vehicle seat used for a vehicle.

As a background art belonging to the technical field according to the present invention, a vehicle seat described in Japanese Patent Application Laid-Open No. 2014-091446 (Patent Document 1) is known. The vehicle seat of Patent Document 1 is configured such that the seat back is rotatable about the hinge portion with respect to the seat cushion. The hinge portion includes a back hinge on the seat back side and a cushion hinge on the seat cushion side, and includes a reclining mechanism and a spring (hereinafter referred to as a first spring). In this vehicle seat, the relative angle of the seat back with respect to the seat cushion can be adjusted via the back hinge and the cushion hinge by changing the lock angle of the reclining mechanism. The first spring composed of a spiral spring has an inner end coupled to the cushion hinge and an outer end coupled to the back hinge, and urges the seat back in a direction to reduce the relative angle of the seat back with respect to the seat cushion. (See paragraph 0009).

The vehicle seat further includes an assist spring (hereinafter referred to as a second spring) configured by a spiral spring on a back hinge and a cushion hinge different from the above-described back hinge and cushion hinge. The second spring has an inner end fitted to the cushion hinge side and an outer end engaged to the back hinge side. The second spring assists in the direction of lifting the seat back from the folded state on the seat cushion (hereinafter referred to as the forward-turned state) to the position or state where the seat back can be seated (hereinafter referred to as the sitting position or the seated state). Generate power. At this time, the assist force is limited so as to act on the seat back in a range in which the seat back is lifted by a predetermined angle from the forward-turned state toward the seating position. Specifically, this limit range is a predetermined angle forward of the seat back relative to the position where the reclining mechanism is locked first (first-stage lock position) when the seat back is lifted from the forward-turned state toward the seating position. This is a range between a position where the seatback is tilted by α and a position where the seat back is in the forward-turned state (see paragraphs 0011 to 0014). The operation of lifting the seat back from the forward position toward the seating position is referred to as a seat back lifting operation or simply a lifting operation.

JP 2014-091446 A

In the vehicle seat disclosed in Patent Document 1, the assist force by the second spring during the lifting operation of the seat back is released before the seat back reaches the first-stage lock position. Then, from the time when the assist force by the second spring is released, only the urging force of the first spring acts on the seat back. After the assist force by the second spring is released, the operator operates the seat back to which only the urging force of the first spring acts to operate the seat back to the first-stage lock position, and the urging force of the first spring. The operation power that resists is required.

Further, since the urging force of the first spring is applied to the seat back at the same time when the assist force by the second spring is released, the resistance force received by the operator suddenly increases immediately before the first-stage lock position. Become. Depending on the degree of change in the resistance force, an unfamiliar operator may mistakenly assume that the locking at the first-stage lock position has been completed when the resistance force suddenly increases.

In Patent Document 1, consideration for the above-described problems is not sufficient, and a vehicle seat having improved operability by solving such problems is desired.

An object of the present invention is to provide a vehicle seat that can perform a seat back lifting operation with a small operating force and can reliably lock the seat back to the first-stage lock position during the seat back lifting operation. is there.

In order to achieve the above object, the vehicle seat of the present invention comprises:
A seat cushion having a seating surface, a seat back standing on a rear end portion of the seat cushion and having a backrest, a support leg provided on the seat cushion and supporting a load applied to the seat cushion, the seat back, A vehicle seat comprising: a support base portion that supports a seat cushion and the support legs; and a reclining mechanism that is provided between the seat back and the support base portion and locks the tilt angle of the seat back so as to be adjustable. In
Between the seat back and the support base portion, provided with an assist mechanism that applies an urging force in a forward tilt direction to the seat back when the tilt angle of the seat back is adjusted by the reclining mechanism,
The assist mechanism applies the urging force to the seat back on the side where the seat back tilts backward with respect to a first-stage lock position where the reclining mechanism is locked first when the seat back is lifted from a state of being tilted forward. The seat back is inclined forward with respect to the first-stage lock position, and is configured to cancel the application of the urging force to the seat back.
The urging force release position at which the urging force with respect to the seat back is released is set on the side where the seat back tilts backward from the initial stage lock position.

According to the present invention, the urging force release position at which the urging force to the seat back by the assist mechanism is released is set on the side where the seat back is tilted backward relative to the first-stage lock position. The seat back can be securely locked at the first-stage lock position when the seat back is lifted.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view showing a state in which a vehicle seat 1 according to an embodiment of the present invention is set at a sitting position, a tip-up state, and a dive-down state. It is a side view which shows the structure of a flame | frame about the vehicle seat 1 set to the seating position. It is a front view which shows the structure of a flame | frame about the vehicle seat 1 set to the seating position. FIG. 3 is an enlarged side view showing the vicinity of a support leg 6 B and a link member 7 of the vehicle seat 1 of FIG. 2. It is a front view which expands and shows the vicinity of the support leg 6B of the vehicle seat 1 of FIG. It is a side view which shows the structure of a flame | frame about the vehicle seat 1 in the state in the middle from the seating position to the state where it was chipped up. It is a side view showing the composition of a frame about vehicular seat 1 in the state where it was chipped up. It is a side view which shows the structure of the flame | frame in each state of the state set to the seating position (solid line), the chip-up state (one-dot chain line), and the dive-down state (one-dot chain line) about the vehicle seat 1. It is a perspective view which shows the state by which the support leg 6 was hold | maintained at the leg holding member 8 about the vehicle seat 1 set to the seating position. FIG. 6 is an enlarged side view showing the vicinity of a leg holding member 8. It is a side view of the vehicle seat 1 set at the seating position, and is a view for explaining the characteristics of the configuration of the frame. In the side view of the vehicle seat 1 of FIG. 11, it is a conceptual diagram which shows the characteristic of the load which acts on a flame | frame when a passenger seats. It is an enlarged view of the vicinity of the assist mechanism 30 shown in FIG. It is a figure which shows the state of the assist mechanism 30 in the state in which the seat back 3 was locked in the first-stage lock position. It is a figure which shows the state of the assist mechanism 30 in the state (backward state) in which the seat back 3 was tilted back from the first-stage lock position.

Hereinafter, examples according to the present invention will be described. In the following description, the front-rear direction is the front-rear direction of the vehicle, the width direction is the width direction of the vehicle or the vehicle seat (both are the same direction), and the left-right direction is the front of the vehicle (sitting on the vehicle seat) In the state), the vertical direction means the vertical direction when the vehicle is horizontally arranged. The left-right direction is the same direction as the width direction of the vehicle or the vehicle seat. Symbol F in the figure indicates that the arrow direction is the front of the vehicle, and symbol R indicates that the arrow direction is the rear of the vehicle. Symbol r indicates that the arrow direction is the right direction of the vehicle, and symbol l indicates that the arrow direction is the left direction of the vehicle.

Further, the case where the vehicle seat 1 is set (set) in a state where a person can be seated will be referred to as a state set (set) at a seating position. In the state where the vehicle seat 1 is set at the seating position, the seat cushion 2 is returned to a predetermined position on the support base portion 5 from a tip-up state or a dive-down state, which will be described later, and the seat back 3 is seated. Is standing at a predetermined angle.

The state in which the seat back 3 is folded on the seat cushion 2 is referred to as a forward-turned state, and the position or state of the seat back 3 when the seat back 3 is set to a seatable position or state is set to the seating position or Called the seated state.

Hereinafter, an embodiment of a vehicle seat 1 according to the present invention will be described with reference to the drawings.

FIG. 1 is a side view showing a state in which a vehicle seat 1 according to an embodiment of the present invention is set at a sitting position, a tip-up state, and a dive-down state.

As shown in FIG. 1, a vehicle seat 1 includes a seat cushion 2 having a seating surface on which a person sits, and a backrest standing on a rear end portion of the seat cushion 2 (a surface that supports a seated person's waist and back). And a headrest 4 provided at the upper end of the seatback 3. The vehicle seat 1 is fixed to a vehicle floor (vehicle floor) by a support base portion 5. The support base portion 5 includes a slide mechanism, and the seat cushion 2, the seat back 3, and the headrest 4 can be integrally slid in the longitudinal direction of the vehicle.

The seat cushion 2 can be flipped up so that the front part is positioned higher than the rear part. In FIG. 1, the seat cushion in a chip-up state is indicated by a one-dot chain line 2 ′.

The seat cushion 2 can be shifted from the tip-up state 2 ′ to a state in which the seat back 3 and the headrest 4 are integrated and dive down (a state in which the seat back 3 is folded on the seat cushion 2). In FIG. 1, the seat cushion, the seat back, and the headrest in the dive-down state are indicated by alternate long and short dash lines 2 ″, 3 ″, and 4 ″.

Transition from the state in which the seat cushion 2 and the seat back 3 are set to the sitting position (the state indicated by the solid line 2 in FIG. 1) to the dive-down state indicated by the alternate long and short dash lines 2 ″, 3 ″, and 4 ″. Is also possible. In this case, the seat cushion 2 and the seat back 3 are moved down to the lower vehicle floor surface (storage part) 100B lower than the vehicle floor surface 100A and stored in the lower vehicle floor surface 100B in conjunction with the forward tilt of the seat back 3. . In the state in which the vehicle seat 1 is dive-down, the back surface of the seat back 3 (3 ″) that has been brought forward can be used as the load surface of the luggage. Note that, as in this embodiment, the vehicle seat 1 that can be dive-down may be referred to as a dive-down seat.

Next, the frame structure of the vehicle seat 1 will be described with reference to FIGS. FIG. 2 is a side view showing the configuration of the frame of the vehicle seat 1 set at the seating position. FIG. 3 is a front view showing a frame configuration of the vehicle seat 1 set at the seating position. 4 is an enlarged side view showing the vicinity of the support leg 6B and the link member 7 of the vehicle seat 1 of FIG. FIG. 5 is an enlarged front view showing the vicinity of the support leg 6B of the vehicle seat 1 of FIG.

In the vehicle seat 1, cushion materials and cover members are provided so as to cover the frame materials of the seat cushion 2, the seat back 3, and the headrest 4. The frame configuration shown in FIGS. 2 to 9 shows a state in which the cushion material and the cover member are removed from the seat cushion 2, the seat back 3, and the headrest 4. FIG. 1 shows a state in which cushion members and cover members are provided on the seat cushion 2, the seat back 3, and the headrest 4.

The seat cushion frame 11 constituting the skeleton of the seat cushion 2 is formed of a pipe material. The seat cushion frame 11 includes a front edge portion 11A extending in the left-right direction at the front portion of the seat cushion 2 and a rear edge from both ends of the front edge portion 11A in a state where the seat cushion 2 is set at the seating position. And provided side edge 11B. The side edge portion 11B extends rearward from the right side edge portion 11B1 (see FIG. 3) extending rearward from the right end portion of the front edge portion 11A and the left end portion of the front edge portion 11A. Left side edge 11B2 (see FIGS. 2 and 3).

The hinge part 12 is connected and fixed to the rear end part of the side edge part 11B of the seat cushion frame 11. The hinge portion 12 includes a right hinge portion 12A (see FIG. 3) provided on the right side edge portion 11B1 of the seat cushion frame 11, and a left hinge portion 12B provided on the left side edge portion 11B2 of the seat cushion frame 11. (See FIGS. 2 and 3). The hinge portion 12 is formed of a plate material that has been subjected to a bending process. The hinge portion 12 may be regarded as a member constituting a part of the frame of the seat cushion 2.

The seat back frame 13 forming the skeleton of the seat back 3 is formed of a pipe material. The seat back frame 13 includes an upper edge portion 13A extending in the left-right direction at the upper portion and a side edge extending downward from both ends of the upper edge portion 13A in a state where the seat back 3 is set at the seating position. Part (hanging part) 13B. The side edge portion 13B is extended downward from the right side edge portion 13B1 (see FIG. 3) extending downward from the right end portion of the upper edge portion 13A and the left end portion of the upper edge portion 13A. And a left side edge 13B2 (see FIGS. 2 and 3).

The hinge part 14 is connected and fixed to the lower end part of the side edge part 13B of the seat back frame 13. The hinge portion 14 includes a right hinge portion 14A (see FIG. 3) provided on the right side edge portion 13B1 of the seat back frame 13 and a left hinge portion 14B provided on the left side edge portion 13B2 of the seat back frame 13. (See FIGS. 2 and 3). The hinge portion 14 is formed of a plate material that has been subjected to a bending process. The hinge portion 14 may be regarded as a member constituting a part of the frame of the seat back 3.

The seat cushion frame 11 and the hinge part 12 are connected to the seat back frame 13 and the hinge part 14 so as to be rotatable about a rotation shaft 15. Thereby, the seat cushion 2 is configured to be capable of tip-up operation.

The support leg 6 (6A, 6B, 6C) is connected to the hinge part 12 of the seat cushion 2. The standing

portions

6A and 6B of the support leg 6 are provided so as to extend in the vertical direction in a state where the seat cushion 2 is set at the seating position. A connecting member 6C extending in the left-right direction is connected to the lower end portion of the standing portion 6A and the lower end portion of the standing portion 6B.

The upper end portion of the standing portion 6A is connected to the right hinge portion 12A of the seat cushion 2. The upper end portion of the standing portion 6B is connected to the left hinge portion 12B of the seat cushion 2. The standing portion 6B is connected to the left hinge portion 12B so as to be rotatable about a rotation shaft provided at a position indicated by reference numeral 16 in FIG. Further, the standing portion 6A is rotatably connected to the right hinge portion 12A around the rotation shaft provided at the position corresponding to the rotation shaft 16 of the left hinge portion 12B on the right hinge portion 12A. Yes.

The connecting member 6C is formed of a pipe material, the central portion has a large diameter, and small diameter portions 6Ca and 6Cb having a smaller diameter than the central portion are provided at both ends thereof. The standing

portions

6A and 6B are made of a plate-like member, and are provided with openings through which the small diameter portions 6Ca and 6Cb of the connecting member 6C pass. The small diameter portions 6Ca and 6Cb of the horizontal portion 6B pass through the standing

portions

6A and 6B and project outside the standing

portions

6A and 6B.

One end portion of the link member 7 is connected to the small diameter portion 6Cb of the connecting member 6C protruding to the outside of the standing portion 6B. The link member 7 is configured to be rotatable with respect to the support leg 6 with the small diameter portion 6Cb as a rotation axis (rotation center). The other end portion of the link member 7 is connected to a rotating shaft 17 whose position is fixed with respect to the support base portion 5, and the link member 7 is rotatable about the rotating shaft 17 with respect to the support base portion 5. It is configured. The rotating shaft 17 is located behind and above the small diameter portion 6Cb.

The left hinge part 14B of the seat back 3, the standing part 6B of the support leg 6, and the link member 7 are arranged in this order from the inside of the vehicle seat 1 to the outside. The rotating shaft 16 of the standing portion 6B is provided inside the left hinge portion 14B. With this configuration, the left hinge portion 14B, the upright portion 6B, and the link member 7 can be rotated without interfering with each other, and each component can be arranged compactly.

In the present embodiment, by configuring the rotation shaft of the link member 7 with the small diameter portion 6Cb of the connecting member 6C, the number of parts can be reduced and a simple configuration can be realized.

Headrest frames 23A and 23B forming a skeleton of the headrest 4 are attached to the upper end portion of the seatback frame 13 of the seatback 3.

The support base unit 5 includes a slide rail device 18 having a lower rail 18A and an upper rail 18B. The lower rail 18A is fixed to the vehicle floor 100A. The upper rail 18B is configured to be slidable in the front-rear direction with respect to the lower rail 18A. The slide rail device 18 is a slide mechanism for sliding the vehicle seat 1 in the front-rear direction.

The slide rail device 18 is disposed one by one on the left and right sides of the vehicle seat 1. Of the left and right slide rail devices 18, the slide rail device 18 disposed inward in the vehicle compartment is referred to as an inner slide rail device 18, and the slide rail device 18 disposed outward in the vehicle compartment is referred to as an outer slide rail device 18. It may be called the slide rail device 18.

The seat riser 19 is attached to the upper rail 18B of the slide rail device 18. The seat riser 19 is a part of the support base 5 and is formed by bending a plate-shaped metal member. The seat riser 19 is a holding member (supporting member) for holding or supporting the vehicle seat 1 having a tip-up function and a dive-down function, and the seat back 3 is attached to the upper portion of the seat riser 19. In this embodiment, the lower end portion of the hinge portion 14 of the seat back 3 is connected to the rotating shaft 17, and the seat back frame 13 and the hinge portion 14 of the seat back 3 rotate with respect to the seat riser 19 about the rotating shaft 17. It is attached as possible.

The position of the rotary shaft 17 is fixed with respect to the seat riser 19. The rotating shaft 17 is a rotating shaft to which the other end portion of the link member 7 is connected, and serves as a connecting portion of the link member 7 and a connecting portion of the hinge portion 14 of the seat back 3. A simple structure can be realized by concentrating the rotation centers of the plurality of rotation members on one rotation axis.

The slide rail device 18 and the seat riser 19 of the support base 5 are covered with a resin cover 20 (see FIG. 1).

The front part of the lower rail 18A of the slide rail device 18 is fixed to the vehicle floor 100B by

fixtures

21A and 21B. The fixture 21A fixes the right slide rail device 18 to the vehicle floor 100B, and the fixture 21B fixes the left slide rail device 18 to the vehicle floor 100B.

A leg holding member (catcher) 8 for removably fixing the support leg 6 is attached to the upper rail 18B of the slide rail device 18. In a state where the seat cushion 2 is set to the seating position, the connecting member 6 C of the support leg 6 is engaged with the leg holding member 8.

In this embodiment, an assist mechanism 30 is provided between the right hinge portion 14A and the seat riser 19. The assist mechanism 30 will be described in detail later.

Next, the tip-up operation and dive-down operation of the vehicle seat 1 will be described with reference to FIGS.

FIG. 6 is a side view showing the configuration of the frame of the vehicle seat 1 in a state in the middle of reaching the tip-up state from the seating position. FIG. 7 is a side view showing the configuration of the frame of the vehicle seat 1 in a chip-up state. FIG. 8 is a side view showing the configuration of the frame in each state of the vehicle seat 1 set in the seating position (solid line), tip-up state (dashed line), and dive-down state (dashed line). is there.

The state shown in FIG. 6 is located higher than the state (sitting position) shown in FIG. 2 with the front part of the seat cushion frame 11 (seat cushion 3) lifted up and the rear part (connecting part to the rotating shaft 15). Thus, the state in the middle of performing the chip-up operation of the seat cushion 3 is shown. The connecting member 6 C of the support leg 6 is detached from the leg holding member 8 by lifting the front part of the seat cushion 3.

Further, since the link member 7 is connected to the small-diameter portion 6Cb of the connecting member 6C, the standing

portions

6A and 6B of the support leg 6 are rotated about the rotation shaft 16 and the posture with respect to the seat cushion frame 11 is changed. . That is, the posture is changed so that the connecting member 6 C approaches the seat cushion frame 11 and the standing portions 6 A and 6 B are along the seat cushion frame 11.

At this time, the link member 7 rotates about the rotation shaft 17, and the standing portion 6B and the link member 7 rotate relative to each other about the small diameter portion 6Cb and are relatively displaced.

The state shown in FIG. 7 is a state where the chip-up operation is completed. When the tip-up operation is completed, the seat cushion frame 11 and the seat back frame 13 are substantially parallel, and the seat surface of the seat cushion 2 and the front surface of the seat back 3 are in contact with each other.

When the tip-up operation is completed, the

upright portions

6A and 6B of the support leg 6 are along the seat cushion frame 11, with the connecting portion with the rotating shaft 16 on the upper side and the connecting portion with the connecting member 6C on the lower side. On the side, the posture is such that the longitudinal direction is arranged substantially in the vertical direction (vertical direction). At this time, the link member 7 has a posture in which the longitudinal direction is arranged substantially in the vertical direction (vertical direction) with the connection portion with the connection member 6C on the upper side and the connection portion with the rotating shaft 17 on the lower side.

In the plan view of FIG. 7, the side edge of one of the standing portions 6 A and 6 B (seat cushion frame 11 side) is in a position overlapping the seat cushion frame 11. That is, when the vehicle seat 1 is viewed from the side, one side edge (the seat cushion frame 11 side) of the standing portions 6 A and 6 B is in a position overlapping the seat cushion frame 11. At this time, the standing

portions

6A and 6B of the support leg 6 are stored in the storage space formed on the lower surface of the seat cushion (from the state shown in FIG. 2) to the seat cushion frame 11 (the state shown in FIG. 2). (State of FIG. 7).

The link member 7 is a member for shifting the standing

portions

6A and 6B of the support leg 6 to the retracted state in conjunction with the tip-up operation of the seat cushion 3, and one of the left and right standing

portions

6A and 6B. As long as it is provided on the side.

In FIG. 8, the seat cushion frame 11 (seat cushion 2) in a chip-up state, the standing portion 6B of the support leg 6 and the link member 7 are respectively denoted by reference numerals 11 ′ (2 ′), 6B ′ and 7 ′, and dive. The seat cushion frame 11 (the seat cushion 2), the seat back frame 13 (the seat back 3), the upright portion 6B of the support leg 6 and the link member 7 in the down state are denoted by 11 ″ (2 ″) and 13 ′, respectively. '(3 ″), 6B ″ and 7 ″.

The seat cushion frame 11 ″ (seat cushion 2 ″) in the state where the dive down is completed, the standing portion 6B ″ of the support leg 6 and the link member 7 ″ are the seat cushion frame 11 in the state where the tip up is completed The relative positional relationship between '(seat cushion 2'), the standing portion 6B 'of the support leg 6 and the link member 7' is maintained. The connecting member 6 C of the support leg 6 is engaged with the leg holding member 8, and the relative position with respect to the seat riser 19 is fixed.

In this embodiment, the support leg 6 is automatically stored in the storage space formed on the lower surface of the seat cushion 2 in conjunction with the tip-up operation of the seat cushion 2. For this reason, the operation of storing the support legs 6 after the tip-up operation becomes unnecessary.

Further, when returning the seat cushion 2 from the tip-up state to the seating position, the support legs 6 stored in the storage space are automatically deployed and returned to the state of being erected on the lower surface of the seat cushion 2. Alternatively, when the seat cushion 2 and the seat back 3 are returned from the dive-down state to the seating position, the support legs 6 are automatically deployed. For this reason, when returning the vehicle seat 1 from the tip-up state or the dive-down state to the seating position, an operation for expanding the support leg 6 is not required.

In this embodiment, the operation of storing or unfolding the support legs 6 is not necessary, and the number of operations when changing the seat arrangement can be reduced. Thereby, the vehicle seat 1 with good operability can be provided.

Next, the leg holding member 8 will be described with reference to FIGS. 9 and 10. FIG. 9 is a perspective view showing a state in which the support leg 6 is held by the leg holding member 8 with respect to the vehicle seat 1 set at the seating position. FIG. 10 is an enlarged side view showing the vicinity of the leg holding member 8. In FIG. 9, the leg holding member 8 is shown by cutting out a part (front part) of the left seat riser 19.

In this embodiment, one leg holding member 8 is provided for each of the left and right seat risers 19.

As shown in FIG. 9, a seat riser 19 is attached to the upper rail 18 B, and the leg holding member 8 is fixed to the seat riser 19. That is, the leg holding member 8 is fixed to the upper rail 18 B via the seat riser 19.

The leg holding member 8 is formed by bending a plate-like metal. As shown in FIG. 10, the leg holding member 8 has a cross section of a Greek letter Ω. The leg holding member 8 receives the receiving portion 8A for receiving the connecting member 6C of the supporting leg 6, the insertion / removal port 8B for inserting or withdrawing the connecting member 6C with respect to the receiving portion 8A, and the connecting member 6C of the supporting leg 6 Receiving pieces 8C and 8D for guiding the connecting member 6C to the insertion / removal port 8B when inserted into the portion 8A.

The leg holding member 8 is fixed on the sheet riser 19 with the receiving portion 8A on the lower side and the insertion / removal port 8B on the upper side. The width dimension of the insertion / extraction port 8B is smaller than the diameter of the connecting member 6C. The leg holding member 8 is formed by bending a plate-like metal and is a member that can be elastically deformed. When the connecting member 6C is inserted or pulled out from the receiving portion 8A, the leg holding member 8 is elastically deformed so as to increase the width of the insertion / extraction port 8B, and after the connecting member 6C is received by the receiving portion 8A. It returns to its original shape (width dimension of the insertion / extraction port 8B).

The leg holding member 8 receives a large load when a person is seated on the vehicle seat 1. Therefore, the member that supports the leg holding member 8 is also required to have high rigidity and high strength. The slide rail device 18 having the upper rail 18B and the seat riser 19 have high rigidity and high strength in order to receive a load when a person is seated. In the present embodiment, since the slide rail device 18 and the seat riser 19 are used as the support members for the leg holding member 8, high rigidity and high strength are ensured for the support members for the leg holding member 8.

In order to increase the support strength and rigidity of the leg holding member 8, the leg holding member 8 is disposed so as to be positioned vertically above the upper rail 18 B of the slide rail device 18. As shown in FIG. 5, the leg holding member 8 is disposed such that the lower surface 8 A faces the upper surface 18 B 1 of the upper rail 18 B through the seat riser 19. That is, the lower surface 8A of the leg holding member 8, the plate surfaces 19A and 19B of the plate-like sheet riser 19, and the upper surface 18B1 of the upper rail 18B are arranged in parallel, and the lower surface 8A of the leg holding member 8 and the plate-like sheet riser 19 are arranged. The other plate surface (lower surface) 19B of the sheet riser 19 and the upper surface 18B1 of the upper rail 18B are in contact with each other.

Further, the leg holding member 8 is disposed between the front end portion and the rear end portion of the upper rail 18B. In particular, in the present embodiment, the leg holding member 8 is disposed closer to the front end than the rear end of the upper rail 18B.

Further, since the slide rail device 18 and the seat riser 19 are used as the support members of the leg holding member 8, it is not necessary to provide a separate support member having high rigidity and high strength, and a simple structure can be realized.

Further, since the leg holding member 8 is arranged on the slide rail device 18 and the seat riser 19, it is not necessary to arrange the leg holding member 8 and its supporting member between the left and right slide rail devices 18. For this reason, the space between the left and right slide rail devices 18 can be effectively used as a luggage storage space.

In this embodiment, one leg holding member 8 is provided for each of the left and right seat risers 19 (or slide rail devices 18), and two leg holding members 8 are provided in total. When the required strength can be ensured with one leg holding member 8 arranged on either the left or right side, a configuration in which only one leg holding member 8 is provided may be used.

In the present embodiment, since the leg holding member 8 is arranged on the seat riser 19 (or the slide rail device 18), the leg holding member 8 is located at a position where the connecting member 6C of the support leg 6 is offset in the left-right direction. Hold. For this reason, when only one leg holding member 8 is provided, it is necessary to increase the strength with which the leg holding member 8 supports the support leg 6. On the other hand, when two leg holding members 8 are provided, the strength with which one leg holding member 8 supports the support leg 6 can be reduced.

Next, the assist mechanism 30 will be described with reference to FIGS.

FIG. 11 is a side view of the vehicle seat 1 set at the seating position, and is a view for explaining the characteristics of the configuration of the frame. FIG. 12 is a conceptual diagram showing characteristics of loads acting on the frame when a passenger is seated in the side view of the vehicle seat 1 of FIG. 11.

As described above, the seat back 3 has the support base portion 5 (seat) in a state in which the seat back 3 is rotatable in the forward and backward tilt directions around the rotation shaft (first rotation shaft) 17 provided at the lower end portion. It is connected to the riser 19). The seat cushion 2 rotates with respect to the seat back 3 in a direction in which the seat surface approaches the backrest and a direction in which the seat surface separates from the backrest, with a rotation shaft (second rotation shaft) 15 provided at the rear end portion as a center. In a possible state, the seatback 3 is connected between the first rotating shaft 17 and the upper end. The support leg 6 is connected to the seat back 3 so as to be pivotable in the forward and backward tilt directions around the rotation shaft (third rotation shaft) 16 provided at the upper end portion, and at the lower end. The support member 5C is connected to the support base 5 (the seat riser 19) in a forward tilt direction and a backward tilt direction around the small diameter part (fourth rotation shaft) 6Cb of the connection member 6C provided in the part. ing.

As shown in FIG. 11, a straight line connecting the rotation center of the rotation shaft (rotation shaft) 16 and the rotation center of the rotation shaft (rotation shaft) 6Cb constituted by the small diameter portion 6Cb of the connecting member 6C. The segment Ax6, a line segment Ax12 connecting the rotation center of the rotation shaft (rotation shaft) 15 and the rotation center of the rotation shaft 16 with a straight line, and the rotation center and rotation shaft of the rotation shaft (rotation shaft) 17 A line segment Ax14 connecting the 15 rotation centers with a straight line and a line segment Ax7 connecting the rotation center of the rotation shaft 6Cb and the rotation center of the rotation shaft 17 with a straight line are assumed. A horizontal line is indicated by a straight line LH.

A line segment Ax6 represents the axis (first node) of the upright portion 6 connecting the rotation centers of both ends, and a line segment Ax12 is the axis of the hinge 12 (second node) connecting the rotation centers of both ends. The line segment Ax14 represents the axis (third node) of the hinge part 14 connecting the respective rotation centers at both ends, and the line segment Ax7 is the axis (the third line) of the link member 7 connecting the respective rotation centers at both ends. Section). The standing portion 6 (line segment Ax6), the hinge portion 12 (line segment Ax12), the hinge portion 14 (line segment Ax14), and the link member 7 (line segment Ax7) constitute a link mechanism, and the rotary shaft 6Cb and the rotary shaft 16 The rotating shaft 15 and the rotating shaft 17 constitute a joint of the link mechanism.

Here, in a state where the vehicle seat 1 is set at the seating position, the positions of the rotating shaft 6Cb and the rotating shaft 17 are fixed on the seat riser 19. Of course, when the tip-up operation and the dive-down operation are performed, the rotating shaft 6Cb is separated from the seat riser 19.

The first rotating shaft 17 and the second rotating shaft 15 are disposed rearward with respect to the third rotating shaft 16 and the fourth rotating shaft 6Cb, and the second rotating shaft 15 is the first rotating shaft 17. The third rotating shaft 16 is disposed rearward with respect to the fourth rotating shaft 6Cb. As a result, the angle θ formed between the axis Ax6 of the standing portion 6 constituting the first node and the horizontal line (horizontal plane) is smaller than 90 degrees and forms an acute angle.

When the angle θ is an acute angle, when the passenger sits on the seat cushion 2 or places a load on the seat cushion 2, the rotary shaft (joint) 16 is pushed downward in the vertical direction as shown in FIG. The load FCA to be applied acts. At this time, as described above, the line segment (first node) Ax6, the line segment (second node) Ax12, the line segment (third node) Ax14, and the line segment (fourth node) Ax7 are linked mechanisms. The positions of the rotation shaft (joint) 6Cb and the rotation shaft (joint) 17 are fixed. For this reason, the first node Ax6, the second node Ax12, and the third node Ax14 ′ are broken lines by the interaction (interaction) of the first node Ax6, the second node Ax12, and the third node Ax14. The first node Ax6 ′, the second node Ax12 ′, and the third node Ax14 ′ shown in FIG. At this time, the joint 16 and the joint 15 try to be displaced to the positions of the joint 16 ′ and the joint 15 ′ indicated by broken lines. Whether or not each node and each joint is actually displaced when the load FCA is applied depends on the magnitude of the load FCA or the rigidity of the vehicle seat 1.

In this case, the movement of the link mechanism is such that the angle θ becomes a smaller angle θ ′, and a force FCB in the direction of tilting backward (reversing direction) acts on the seat back frame 13 (seat back 3). . In the state where the force FCB is applied, if the seat back 3 is caused to be caused in a direction in which the relative angle with the seat cushion 2 is reduced (forward direction), a large force to overcome the force FCB is required.

Therefore, in this embodiment, the assist mechanism 30 is provided so that the seat back 3 can be caused with a small force when the force FCB is applied. Hereinafter, the assist mechanism 30 will be described.

FIG. 13 is an enlarged view of the vicinity of the assist mechanism 30 shown in FIG.

The vehicle seat 1 includes a reclining mechanism 40 at a connecting portion (17 rotating shafts) between the seat back frame 13 (specifically, the hinge portion 14) and the seat riser 19.

In the present embodiment, the position where the reclining mechanism 40 (see FIG. 13) is first locked when the seat back 3 is lifted from the forward position toward the seating position is referred to as a first-stage lock position. The reclining mechanism 40 has a plurality of lock positions on the side where the seat back 3 is further tilted backward from the first-stage lock position. Thereby, the reclining mechanism 40 can lock the seat back 3 at a plurality of reclining angles. The first-stage lock position is a lock position where the seat back 3 is located on the most forward tilt side among the plurality of lock positions.

In this embodiment, the reclining mechanism 40 is disposed so as to be interposed between the left hinge portion 14B and the seat riser 19. The reclining mechanism 40 supports the left hinge portion 14B so as to be rotatable with respect to the seat riser 19, and can make the seat back frame 13 (seat back 3) stationary at an arbitrary reclining angle by a lock mechanism (not shown). By changing the reclining angle, the relative angle (reclining angle) of the seat back 3 with respect to the seat cushion 2 can be adjusted.

Further, the reclining mechanism 40 includes an operation lever (not shown) in order to unlock the seat back frame 13 locked at an arbitrary reclining angle by the locking mechanism.

The reclining mechanism 40 may be provided in the right hinge portion 14A. Alternatively, the reclining mechanism 40 may be provided in both the left and

right hinge portions

14A and 14B. Such a reclining mechanism 40 can use a well-known thing suitably.

Further, the vehicle seat 1 includes an assist mechanism 30 so that the seat back 3 can be caused to move forward with a small force when the relative angle of the seat back 3 with respect to the seat cushion 2 is adjusted. . The assist mechanism 30 includes a spring 31, a first locking portion (first protruding portion) 32, a second locking portion (second protruding portion) 33, and a third locking portion (third protruding portion) 34. Is provided. The assist mechanism 30 may be regarded as a part of the components constituting the reclining mechanism 40.

In the present embodiment, an area where the assist force by the spring 31 acts (operating area of the spring) AS (see FIG. 14) and an area where the assist force due to the spring 31 does not act (non-operating area of the spring) AF (see FIG. 14). And are provided. The non-operating region of the spring is a region where the assist force by the spring 31 on the seat back 3 (seat back frame 13) is released, and will be described as a free area.

In this embodiment, the spring 31 is constituted by a spiral spring, and urges the seat back 3 in a direction to reduce the relative angle of the seat back 3 with respect to the seat cushion 2. The spring 31 is a spring member that gives an assist force to the seat back 3 when the seat back 3 is caused to move forward, and may be referred to as an assist spring.

The inner end 31 A of the spring 31 is hooked on the first locking portion 32 and locked to the first locking portion 32. On the other hand, the outer end 31 B of the spring 31 is locked at different portions in the spring operating area and the non-operating area.

In the operating region of the spring, the outer end 31 B is hooked on the second locking portion 33 and locked on the second locking portion 33. In this case, the spring 31 is held between the first locking portion 32 and the second locking portion 33. On the other hand, in the free area, the outer end 31 B is hooked on the third locking portion 34 and locked on the third locking portion 34. In this case, the spring 31 is held between the first locking portion 32 and the third locking portion 34.

The outer end 31B of the spiral spring 31 abuts against the second locking portion 33 and the third locking portion 34 in the direction in which the seat back 3 tilts forward, and the spiral spring winds as the seat back 3 tilts backward. As the seat back 3 is tilted forward, the spiral spring is released from tightening. That is, in the spiral spring 31, the winding direction coincides with the backward tilt direction of the seat back 3, and the winding release direction coincides with the forward tilt direction of the seat back 3.

1st latching | locking part 32 is provided in the seat riser 19, and has the protrusion part protruded from the seat riser 19 to the inner side (width direction center side) of the vehicle seat 1. As shown in FIG. The first locking portion 32 may be constituted by a member different from the member constituting the sheet riser 19, or may be constituted integrally with the sheet riser 19 by a member constituting the sheet riser 19. In the present embodiment, the first locking portion 32 is configured by a member different from the sheet riser 19 and is fixed to the sheet riser 19. As this fixing structure, various fixing structures such as fastening by screws and fixing by welding can be taken.

The second locking portion 33 is provided on the seat back frame 13 and has a protruding portion that protrudes from the seat back frame 13 to the inside (width direction center side) of the vehicle seat 1. Specifically, the second locking portion 33 is provided on the hinge portion 14 provided on the seat back frame 13. The second locking portion 33 may be formed of a member different from the member constituting the seat back frame 13 (or the hinge portion 14), or the member constituting the seat back frame 13 (or the hinge portion 14) may be used as the seat back frame. 13 (or hinge part 14) may be integrated. In the present embodiment, the second locking portion 33 is configured by a member different from the hinge portion 14 of the seat back frame 13 and is fixed to the hinge portion 14. As this fixing method, various fixing structures such as fastening by screws and fixing by welding can be taken.

3rd latching | locking part 34 is provided in the seat riser 19, and has the protrusion part protruded from the seat riser 19 to the inner side (width direction center side) of the vehicle seat 1. As shown in FIG. The third locking portion 34 may be constituted by a member different from the member constituting the sheet riser 19, or may be constituted integrally with the sheet riser 19 by a member constituting the sheet riser 19. In the present embodiment, the third locking portion 34 is configured by a member different from the sheet riser 19 and is fixed to the sheet riser 19. As this fixing structure, various fixing structures such as fastening by screws and fixing by welding can be taken.

Since the first locking part 32 and the third locking part 34 are fixed to the seat riser 19, the first locking part 32 and the third locking part in the rotation direction of the seat back 3 around the rotation shaft 17. The position (angular position) of the stop portion 34 is fixed. On the other hand, since the second locking portion 33 is fixed to the seat back frame 13, the second locking portion 33 rotates together with the seat back 3 in the rotation direction of the seat back 3 around the rotation shaft 17.

The assist mechanism 30 may be provided on the left and

right hinge portions

14A and 14B of the seat back frame 13, or may be provided on one of the left and

right hinge portions

14A and 14B. In this embodiment, it is provided in the right hinge portion 14A.

In the present embodiment, the spring 31 of the assist mechanism 30 is constituted by a spiral spring, but may be constituted by a helical spring, a leaf spring or the like as long as the operating range and free area of the spring can be realized.

FIG. 14 is a view showing a state of the assist mechanism 30 in a state where the seat back 3 is locked at the first-stage lock position. FIG. 15 is a diagram illustrating a state of the assist mechanism 30 in a state where the seatback 3 is tilted backward from the first-stage lock position (backward tilt state).

14 and 15, the line segment LA, line segment LB, line segment LC, and line segment LD are defined as follows. The line segment LA includes the engagement portion 33A of the second locking portion 33 with the spring 31 and the center of rotation of the seat back 3 (the axis of the rotary shaft 17) in a state where the seat back 3 is locked at the first-stage lock position. ) With a straight line. The line segment LB is a line segment that connects the engagement portion 34 A of the third locking portion 34 with the spring 31 and the rotation center of the seat back 3 with a straight line. The line segment LC is a line segment that connects the engaging portion 33A and the center of rotation of the seat back 3 with a straight line in a state where the seat back 3 is tilted most backward (backward). The line segment LD rotates the engagement portion 33A of the second locking portion and the seat back 3 in a state in which the seat back 3 is locked at the next-stage lock position (second-stage lock position) of the first-stage lock position. It is a line segment connecting the center with a straight line. 14 and 15, the positive direction of the angle in the rotation direction of the seat back 3 is defined as a clockwise direction.

As shown in FIG. 14, in a state where the seat back 3 is locked at the first-stage lock position, the engaging portion 33 A of the second locking portion 33 is in contact with the third locking portion 34 in the rotational direction of the seat back 3. The seat back 3 exists at an angular position on the side where the seat back 3 tilts forward (forward) than the engaging portion 34A. In other words, in a state where the seat back 3 is locked at the first-stage lock position, the engaging portion 34A of the third locking portion 34 is engaged with the engaging portion 33A of the second locking portion 33 in the rotation direction of the seat back 3. The seat back 3 exists at an angular position on the side where the seat back 3 tilts backward (backward).

In a state where the seat back 3 is locked at the first-stage lock position, the line segment LA and the line segment LB form a predetermined angle α1 larger than 0 degrees. That is, the line segment LB is rotated about the rotation axis 17 by an angle α1 (α1> 0 degrees) with respect to the line segment LA. Therefore, when the seat back 3 is locked at the first-stage lock position, the engagement portion 33A of the second engagement portion 33 is separated from the outer end 31B of the spring 31, and the outer end 31B of the spring 31 is the third engagement portion. Locked to the portion 34. The biasing force (assist force) of the spring 31 is received by the third locking portion 34, and the second locking portion 33 is released from the biasing force of the spring 31.

At this time, the engaging portion 33A of the second locking portion 33 exists within the range of the free area AF. The range of the angle α1 is included in the free area AF on the side where the seat back 3 tilts backward from the first-stage lock position (the angular position of the line segment LA) of the seat back 3, and is within the range of the angle α1 (but on the line segment LB) In this case, the urging force of the spring 31 does not act on the second locking portion 33.

When the seat back 3 tilts backward from the state shown in FIG. 14 and the engaging portion 33A of the second locking portion 33 reaches the line segment LB, the outer end 31B of the spring 31 engages with the second locking portion 33. The engaging portion 33A engages with both the engaging portion 34A of the third locking portion 34 and the engaging portion 33A. From this state, on the side where the seat back 3 tilts backward (angular position), the second locking portion 33 engages with the spring 31 and receives a biasing force from the spring 31.

In FIG. 15, the engaging portion 33 A of the second locking portion 33 is present on the side (angular position) where the seat back 3 tilts backward from the line segment LB. In this case, the outer end 31B of the spring 31 is separated from the engaging portion 34A of the third locking portion 34, and the outer end 31B of the spring 31 is locked to the second locking portion 33. In this state, the urging force of the spring 31 is received by the second locking portion 33, and the seat back 3 receives the assist force of the spring 31.

14 and 15, the assist force by the spring 31 is applied to the seat back 3 via the second locking portion 33 in the spring operating region AS, and the assist force by the spring 31 is applied to the seat back in the non-operating region AF of the spring. No effect on 3.

That is, the assist mechanism 30 in the present embodiment applies the assist force on the side where the seat back 3 tilts backward with respect to the first-stage lock position where the reclining mechanism 40 is first locked when the seat back 3 is lifted from the forward-tilted state. When the seat back 3 is applied to the back 3 and the seat back 3 tilts forward with respect to the first-stage lock position, the application of the assist force to the seat back 3 is released. Further, the assist force applied to the seat back 3 is configured to be released on the side where the seat back 3 tilts backward from the first-stage lock position. That is, the assist force release position (biasing force release position) at which the assist force (biasing force) on the seat back 3 by the assist mechanism 30 is released is set to the side on which the seat back 3 tilts backward from the initial stage lock position.

As described above, the third locking portion 34 regulates the assist range by the spring 31. For this reason, the 3rd latching | locking part 34 may be called an assist range control part.

In the present embodiment, the assist force by the spring 31 acts on the seat back 3 on the rearward tilt side of the first-stage lock position of the seat back 3. For this reason, the angle θ formed between the axis Ax6 of the standing portion 6 of the support leg 6 and the horizontal line (horizontal plane) is smaller than 90 degrees, and the backward tilting force FCB acts on the seat back 3. However, the seat back 3 can be caused to tilt forward with a small force.

In this case, when the seat back 3 is raised to the vicinity of the first-stage lock position, a large force is not required to cause the seat back 3 to be further tilted forward. Therefore, the assist force by the spring 31 acting on the seat back 3 is released in the vicinity of the first-stage lock position of the seat back 3 and on the rearward tilt side of the seat back 3 with respect to the first-stage lock position. Thereby, the assist force by the spring 31 does not act on the seat back 3 on the forward side from the first-stage lock position of the seat back 3. For this reason, when the seat back 3 is brought forward, it is possible to prevent the forward force of the seat back 3 from becoming unnecessarily large.

Further, when the seat back 3 is lifted from the forward-turned state to the seated state, the second locking portion 33 is engaged with the outer end 31B of the spring 31 while the seat back 3 reaches the initial stage lock position (position of the line segment LA). When combined, the urging force of the spring 31 increases the resistance force that sets the seat back 3 to the first-stage lock position. In order to increase the assist force by the spring 31, it is necessary to increase the urging force of the spring 31. However, as the biasing force of the spring 31 is increased, the resistance force that sets the seat back 3 to the first-stage lock position is increased.

The user (operator) of the vehicle seat 1 may misunderstand that the seat back 3 is set at the first-stage lock position when receiving this resistance force.

In the present embodiment, when the seat back 3 is lifted from the forward-turned state to the seated state, the urging force of the spring 31 is maintained until the seat back 3 is set at the first-stage lock position (position of the line segment LA). Don't make it. For this reason, even if the urging force of the spring 31 is increased in order to increase the assist force by the spring 31, the seat back 3 can be reliably set at the first-stage lock position.

Thus, the lifting operation of the seat back 3 from the forward-turned state can be executed with a small operating force, and the seat back 3 can be reliably locked at the first-stage lock position when the seat back 3 is lifted.

In the present embodiment, the engaging portion of the second locking portion 33 is located between the first-stage lock position (angle position of the line segment LA) and the next-stage (second stage) lock position (angle position of the line segment LD). 33A is arranged. There is an angle α2 between the first-stage lock position and the next-stage lock position. The distance between the position of the engaging portion 33A of the second locking portion 33 and the position of the engaging portion 34A of the third locking portion 34 in a state in which the seat back 3 is locked at the first locking position is the first locking position. And the interval between the next-stage lock position and the next-stage lock position. That is, the angle α1 is smaller than the angle α2 (α1 <α2).

Thus, when the seat back 3 is caused to tilt forward, the assist force by the assist mechanism 30 acts on the seat back 3 from the position where the seat back 3 is tilted backward to the next-stage lock position (angle position of the line segment LD). Can be made. Further, when the seat back 3 is caused to move from the next stage lock position toward the first stage lock position, the assist force by the assist mechanism 30 acts on the seat back 3 when the lock is released at the next stage lock position. The seat back 3 is tilted further rearward at the next-stage lock position than at the first-stage lock position. For this reason, a greater operating force is required in the vicinity of the next-stage lock position than in the first-stage lock position in order to cause the seat back 3. In the present embodiment, since the assist force by the assist mechanism 30 can be used in the vicinity of the next-stage lock position, the seat back 3 can be caused to move from the next-stage lock position to the first-stage lock position with a small operating force.

In this embodiment, the vehicle seat 1 has a configuration for performing a tip-up operation and a dive-down operation. However, the present invention is not limited to this configuration, and a tip-up operation is not possible, and a configuration in which a dive down operation can be performed by moving the seat back 3 forward is also possible. When the tip-up operation is not required, the position of the connecting member 6C of the support leg 6 may be fixed to the leg holding member 8 so as to be rotatable around the axis of the connecting member 6C. In this case, the link member 7 may not be provided.

The standing

portions

6A and 6B of the support leg 6 constitute a part of the support leg 6 in order to receive the load applied to the seat cushion 2, and the seat cushion frame 11 of the seat cushion 2 and the vehicle floor surface 100A (or the slide rail device 18). ), And the standing

portions

6A and 6B may be referred to as leg members.

DESCRIPTION OF SYMBOLS 1 ... Vehicle seat, 2, 2 'collar, 2 "... Seat cushion, 3, 3" ... Seat back, 4, 4 "... Headrest, 5 ... Support base part, 6 ... Support leg, 6A ...

Support leg

6B, 6B ', 6B' '... left side standing part of

support leg

6, 6C ... connecting member of supporting

leg

6, 16 ... rotating shaft, 6Ca, 6Cb ... small diameter part of connecting

member

6C, 7, 7 ', 7 "... link member, 8 ... leg holding member (catcher), 8A ... receiving portion, 8B ... insertion / extraction port, 8C, 8D ... receiving piece, 11, 11', 11" ... seat cushion frame 11A: Front edge portion of the

seat cushion frame

11, 11B: Side edge portion of the seat cushion frame 11, 11B1 ... Right side edge portion, 11B2 ... Left side edge portion, 12 ... Hinge portion of the

seat cushion

2, 12A ... Right hinge part, 12B ... Left hinge part, 13, 13 '' ... Seat back frame, 13A ... Upper edge of seat back

frame

13, 13B ... Side edge (hanging part) of seat back frame 13, 13B1 ... Right side edge, 13B2 ... Left side edge, 14 ... Hinge part of seat back 3, 14A ... right side hinge part, 14B ... left side hinge part, 15 ... rotating shaft, 16 ... rotating shaft, 17 ... rotating shaft, 18 ... slide rail device (sliding mechanism), 18A ... lower rail, 18B ... Upper rail, 18 ... slide rail device, 19 ... seat riser, 20 ... resin cover, 21A, 21B ... fixture, 23A, 23B ... headrest frame, 30 ... assist mechanism, 31 ... spring, 31A ... inner end of

spring

31 , 31B: outer end of the spring 31, 32: first locking portion (first protruding portion), 33: second locking portion (second protruding portion), 3 ... third locking portion (third projecting portion), 40 ... reclining mechanism, 100A ... Kurumayukamen, 100B ... low stage of the car floor (housing portion).

Claims

A seat cushion having a seating surface, a seat back standing on a rear end portion of the seat cushion and having a backrest, a support leg provided on the seat cushion and supporting a load applied to the seat cushion, the seat back, A vehicle seat comprising: a support base portion that supports a seat cushion and the support legs; and a reclining mechanism that is provided between the seat back and the support base portion and locks the tilt angle of the seat back so as to be adjustable. Because
Between the seat back and the support base portion, provided with an assist mechanism that applies an urging force in a forward tilt direction to the seat back when the tilt angle of the seat back is adjusted by the reclining mechanism,
The assist mechanism applies the urging force to the seat back on the side where the seat back tilts backward with respect to a first-stage lock position where the reclining mechanism is locked first when the seat back is lifted from a state of being tilted forward. The seat back is inclined forward with respect to the first-stage lock position, and is configured to cancel the application of the urging force to the seat back.
The vehicle seat according to claim 1, wherein a biasing force release position at which the biasing force with respect to the seatback is released is set on a side where the seatback tilts backward with respect to the first-stage lock position.
The vehicle seat according to claim 1,
The seat back is connected to the support base portion in a state of being rotatable in a forward tilt direction and a backward tilt direction around a first rotation shaft provided at a lower end portion,
The seat cushion is pivotable with respect to the seat back in a direction in which the seat surface approaches the backrest and in a direction away from the backrest, with a second rotation shaft provided at a rear end as a center. Connected between the first pivot shaft and the upper end of the seat back;
The support legs are connected to the seat back so as to be rotatable in the forward and backward tilt directions around a third rotation shaft provided at the upper end, and are provided at the lower end. A vehicle seat characterized in that the vehicle seat is pivotably connected to the support base portion in a forward tilt direction and a backward tilt direction around a fourth rotation shaft.
The vehicle seat according to claim 2,
The first rotation shaft and the second rotation shaft are disposed rearward with respect to the third rotation shaft and the fourth rotation shaft, and the second rotation shaft is the first rotation shaft. A vehicle seat, wherein the third rotation shaft is disposed rearward with respect to the fourth rotation shaft, and the third rotation shaft is disposed rearward with respect to the fourth rotation shaft.
In the vehicle seat according to claim 3,
The assist mechanism is
Springs,
A first locking portion provided on the support base portion and locked to one end of the spring;
A second locking portion that is provided on the seat back and is engaged with the other end of the spring in a state in which the biasing force is applied to the seat back;
A third locking portion provided on the support base portion, in which the other end of the spring is locked in a state where the application of the urging force to the seat back is released;
A vehicle seat comprising:
The vehicle seat according to claim 4,
The spring is constituted by a spiral spring, an inner end portion of the spiral spring is engaged with the first locking portion, and an outer end portion of the spiral spring is engaged with the second locking portion or the third locking portion. Has been stopped,
The engaging portion with which the spiral spring of the third locking portion engages is the engaging portion with which the spiral spring of the second locking portion engages in a state where the seat back is locked at the first-stage lock position. On the other hand, the vehicle seat is characterized in that the seat back is disposed on the side inclined backward.