JP3195878B2 - Vehicle seat with reclining mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved seat with a reclining mechanism used for a vehicle such as an automobile.

[0002]

2. Description of the Related Art A vehicle seat having a reclining mechanism of this type includes a pair of lower arms fixed to a seat cushion frame and a pair of upper arms fixed to both lower portions of a seat back frame via a lateral support shaft. The upper arm is swingably supported, and the upper arm is formed with a large number of ratchet teeth arranged in an arc around the support shaft, and the teeth at the tip of the pole supported by the lower arm and swung by the reclining handle are formed. There is a type in which the reclining angle is adjusted by engaging and disengaging the ratchet teeth. And in the prior art, this reclining handle is swingably attached to a support shaft supporting the upper arm, and a part of the reclining handle is extended in a radial direction to a position adjacent to the pole, and the pole is attached to the portion adjacent to each other. An interlocking mechanism including a cam pin and a cam slot for swinging is provided.

[0003]

In this type of seat with a reclining mechanism, when a large impact load is applied from the upper arm side provided with the seat back, the mesh between the tooth portion of the pole tip and the ratchet tooth is disengaged. There is. Such an impact load is generated in the event of a collision of an automobile, and particularly in the case where the upper end of the seat belt is attached to the upper part of the side member of the seat back frame on the upper arm side provided with the ratchet teeth. In addition, the inertial force applied by the occupant is applied to the upper part of the side member via the seat belt, which is one of the major causes of the impact load.

As a means for solving such a problem, it is conceivable to increase the radius of the pitch circle of the ratchet teeth centering on the support shaft to reduce the load applied to the meshing portion. However, in such a case, the size of the reclining handle, particularly, the radius from the support shaft to the portion where the interlocking mechanism for swinging the pole is provided becomes large. For this reason, the weight of the reclining handle increases, and the occupied area required for the operation increases, so that there arises a problem that the degree of freedom in arranging the parts decreases due to interference with surrounding parts.

As described above, if the radius of the pitch circle of the ratchet teeth is increased, the load on the meshing surface between the pawl and the ratchet teeth is reduced. However, the lower arm is caused by the load applied to the support shaft that supports the upper arm in a swingable manner. However, the position of the pawl and the ratchet teeth is displaced and disengaged, and the load for disengagement is not improved as expected. In particular, in the case where the side member of the seat back frame is provided with a support member which is provided integrally with the upper part of the side member and the upper arm and connects the protrusion extending forward, the side member is reinforced. Since the impact load applied to the lower arm increases by the amount, the deformation becomes significant.

Further, since the seat belt having the upper end attached to the upper part of the side member of the seat back frame extends obliquely in the horizontal direction, the force applied to the seat belt is reduced by the upper part of the side member and the supporting member attached thereto. To be deformed. For this reason, a force from an oblique lateral direction is applied to the projecting portion provided integrally with the upper arm via a support member. When such a force is received, the lateral deflection increases sharply, causing lateral bending and torsional deformation, which may result in breakage, which causes a problem that the reinforcing effect of the support member cannot be sufficiently exerted.

The support member has an upper end portion swingably attached to the side member in the front-rear direction and elastically urges forward, and is formed in a protruding portion of the upper arm to extend in the front-rear direction. The lower end of the seat belt is attached to the outside of the lower arm in the prior art, so that the lower end of the seat belt is attached to the lower end of the support member. , The support member cannot swing freely, which hinders the passenger from getting on and off, or has a problem that the reinforcing function of the support member cannot be sufficiently exhibited.

The present invention solves these problems and increases the impact load applied to the upper arm that can be received by the reclining mechanism. In addition, the size of the reclining handle can be reduced without increasing the size of the reclining handle and the weight can be reduced. It is an object of the present invention to provide a vehicle seat with a large reclining mechanism.

[0009]

Seat reclining mechanism with the vehicle according to the present invention SUMMARY OF THE INVENTION may, to a pair of lower arms provided on the seat cushion frame, the upper arm of the pair being fixed to the lower portion of the seat back frame, supported swingably supported in the front-rear direction through the lifting shaft, the ratchet teeth made of a large number of teeth in the a Ppaamu formed in an arc shape around the said support shaft, before Symbol lower arm and the ratchet teeth a pole having teeth releasably engageable swingably supported, before the kilometers Aamu giving a biasing force in one direction and supports the reclining handle swingably having a portion close to the pole An interlocking mechanism is provided between a portion where the pawl and the reclining handle come close to each other, and the tooth portion is formed by swinging the reclining handle against the urging force. The present invention relates to a vehicle seat with a reclining mechanism that is disengaged from the ratchet teeth of the upper arm and swings the pole so that the tooth portion is engaged with the ratchet tooth by the return of the reclining handle by the urging force. There, the recliner handle is obtained by swingably supported km Aa <br/> arm front through the support shaft parallel to the intermediate support shaft located between the pole and the support shaft.

In a vehicle seat with a reclining mechanism according to the present invention, the lower arm supporting the pawl is formed in a box shape by a lower arm body and a lower arm cover integrally fixed to each other, and the support shaft is formed by the lower arm body and the lower arm cover. It is preferable that the one upper arm is swingably supported by being located in the box-shaped lower arm in a portion from a portion supported by the support shaft to the ratchet teeth.

The vehicle seat with the reclining mechanism according to the present invention supports the pole of the seat back frame.
On the upper part of the side member on the lower arm side to hold ,
It is desirable to attach the one end on the upper side of the seat belt.

A vehicle seat with a reclining mechanism according to the present invention supports the pole of the seat back frame.
A support member for reinforcing the side members serving as the lower arm side to lifting, the support member is resiliently urged forward upper portion to the side member swingably attached to the front-rear direction, the lower end portion It is preferable that the upper arm is formed integrally with the upper arm and formed on a protruding portion extending forward and slidably engaged with an arc-shaped long hole extending in the front-rear direction.

In a vehicle seat with a reclining mechanism according to the present invention, the lower arm supporting the pawl is formed in a box shape by a lower arm body and a lower arm cover integrally fixed to each other, and the support shaft is formed by the lower arm body and the lower arm cover. In the normal operation state, the one upper arm is swingably supported by being positioned in the lower arm formed in a box shape in a normal operation state, including the projecting portion formed in a vertical plate shape, It is preferable that a lower end of the support member engaged with the protruding portion slidably abuts on mutually parallel inner surfaces of the box-shaped lower arm to restrain lateral movement.

In the vehicle seat with a reclining mechanism according to the present invention, one end of the intermediate support shaft supports the pole.
It is preferable that the lower arm be protruded inward from the lower arm and a lower end of the seat belt be attached to the one end of the intermediate support shaft.

[0015]

The reclining handle to which a biasing force is applied in one direction normally locks the upper arm by engaging the teeth of the pawl with the ratchet teeth via an interlocking mechanism.
If you swing the reclining handle against the urging force,
The pawl is pivoted via the interlocking mechanism, and its teeth are disengaged from the ratchet teeth, so that the upper arm can pivot. In this state, if the reclining angle is adjusted and the reclining handle is returned by the urging force, the pawl also swings in the returning direction, and the teeth engage with the ratchet teeth to lock the upper arm.

According to the present invention in which the intermediate support shaft for supporting the reclining handle is located between the support shaft and the pole, the load applied to the meshing portion between the teeth of the pole and the ratchet teeth is reduced, and the reclining mechanism receives the load. Even if the pitch circle radius of the ratchet teeth about the support shaft is increased in order to increase the shock load applied to the upper arm, the length of the reclining handle on the pole side does not increase accordingly.

According to the lower arm formed in a box shape, the impact load applied to the upper arm is supported by the lower arm main body and the lower arm cover on both sides of the upper arm so that the load is shared and each member constituting the lower arm is bent. It does not deform under the force.

According to the one in which the upper end portion of the seat belt is mounted on the upper portion of the side member of the seat back frame which is the lower arm side supporting the reclining handle via the intermediate support shaft, the impact load in the event of a collision of the vehicle is reduced. A considerable portion is applied to the upper part of the seat back frame via the seat belt, and this load is received by the reclining mechanism.

According to the structure in which the support member for reinforcing the side member is provided between the upper arm and the support member, the strength of the integrated unit including the seat back frame and the upper arm is increased.

The lower end of the support member, which is engaged with the protrusion of the upper arm formed in a vertical plate shape, slidably abuts on the inner surfaces parallel to each other of the lower arm formed in a box shape to move in the horizontal direction. According to the constrained structure, the lateral deflection does not increase sharply even when a force from an oblique lateral direction is applied to the protrusion.

According to the structure in which the lower end of the seat belt is attached to the end of the intermediate support shaft projecting inward from the lower arm, the upper end is attached to the side member so as to be swingable in the front-rear direction. Since the seat belt does not extend across the range of movement of the lower part of the support member, the swing of the support member is not hindered.

[0022]

As described above, according to the present invention, the radius of the pitch circle of the ratchet teeth centering on the support shaft is increased in order to increase the impact load applied to the upper arm on which the reclining mechanism is received. However, the length of the reclining handle on the pole side does not increase accordingly. Therefore, without increasing the size of the reclining handle as compared with the conventional case, the human body or object can be transferred to other parts via the seat belt attached to the upper side member of the seat back frame in the event of a car collision or the like. The impact force applied to the upper arm from the seat back frame can be increased due to the contact of the seat back frame, thereby increasing the degree of freedom in arranging parts and reducing the impact load applied from the seat back frame. A large vehicle seat with a reclining mechanism can be obtained.

According to the lower arm formed in a box shape, the lower arm supporting the support shaft is not deformed, so that the teeth of the pawl and the ratchet teeth are not disengaged from each other, and the impact applied to the upper arm is reduced. The force for receiving the load further increases.

With the support member for reinforcing the side member, the strength of the integrally joined seat back frame and upper arm is increased, so that the force for receiving the impact load applied to the seat back frame is further increased. I do.

According to the one in which the lower end of the support member engaged with the projecting portion of the upper arm slidably abuts on the mutually parallel inner surfaces of the box-shaped lower arm to restrict the lateral movement, Even if a lateral force is applied to the protruding portion, the lateral deflection does not suddenly increase, so that the reinforcing effect of the support member does not decrease.

According to the seat belt having the lower end attached to the end protruding inside the lower arm,
Since the swinging of the support member is not hindered, the reinforcing function of the support member is reliably exerted, and does not hinder getting on and off.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a first embodiment shown in FIGS. 1 to 7 will be described. The pair of lower arms 10a and 10b shown in FIG.
Each lower arm 10a, 1 is fixed to both sides (outside and inside of the vehicle) of the seat cushion frame of the vehicle seat.
Support shaft 1 having a common transverse axis fixed to the support shaft 1b
1 and 11 are respectively connected through round holes 20a and 25a.
A pair of upper arms 20 and 25 are swingably supported in the front-rear direction. Brackets 29a and 29b fixed to both lower sides of the seat back frame 29 are screwed and fixed to upper portions of the upper arms 20 and 25 via mounting holes 20b and 25b. The spiral springs 22 and 27 whose inner ends are inserted and locked in the diametrical grooves 11a (see FIGS. 6 and 7) of the support shafts 11 and 11 are prevented from falling out, and are erected and fixed to the upper arms 20 and 25. The outer ends of the upper arms 20 and 25 are locked by the pins 22a and 27a.
Is biased forward.

As shown in FIG. 1 to FIG. 3 and FIG. 6, two rivets 1 having an intermediate large diameter portion are provided on the upper arm 20 side of the lower arm 10a of the outer reclining mechanism OR.
5, the plate 14 is fixed with a gap, and the upper arm 20 is located in the gap. A plate 14 side of the upper arm 20 is formed in a sector shape, and a ratchet tooth 21 having a large number of teeth having an arc-shaped pitch circle centering on the support shaft 11 is formed at a tip edge thereof. The tooth portion 30a at the tip end of the pole 30 whose base end side is swingably supported by the large diameter portion has ratchet teeth 21.
Can be disengaged. The intermediate support shaft 13, which is located between the support shaft 11 and the pole 30 and is fixed to the lower arm 10 a in parallel with the support shaft 11, has a relief hole 23 formed in the upper arm 20 in an arc shape centering on the support shaft 11. And extends through the plate 14.

As shown in FIGS. 1, 4, 5 and 7, the lower arm 10b of the inner reclining mechanism IR
Similarly, the plate 18 is fixed with a gap by two similar rivets 19, and the upper arm 25 is located in the gap. A ratchet tooth 2 having a large number of teeth having an arc-shaped pitch circle centered on the support shaft 11 is also provided at the distal end edge of the fan-shaped upper arm 25 on the plate 18 side.
6 is formed, and the tooth portion 35a at the tip end of the pawl 35 whose base end side is swingably supported by one rivet 19 is capable of engaging and disengaging with the ratchet teeth 26. The support shaft 11 of the lower arm 10b protrudes through the plate 18, and a spiral spring 27 is provided at the tip thereof. In this embodiment, the pitch circle radius and the size of the tooth profile of the ratchet teeth 26 are smaller than those of the ratchet teeth 21.

As shown in FIGS. 1 to 3 and 6, a reclining handle 40 is swingably supported at the tip of an intermediate support shaft 13 protruding from the plate 14 through a round hole 40a. A swing arm 41 is swingably supported at the other end through a round hole 41a. Both the reclining handle 40 and the swing arm 41 are retained and retained with respect to the intermediate support shaft 13, and each end is
The pole 3 passes through the relief hole 12 formed in the lower arm 10a.
The connection pin 43 is connected by a connection pin 43 that passes outside the outer periphery of the connection pin 43, and a rotatable roller 44 is provided at an intermediate large diameter portion of the connection pin 43. The cam pin 31 erected and fixed on the side of the tip of the pawl 30 passes through a notch in the plate 14, and the tip of the cam pin 31 is formed in a cam slot 42 formed in the reclining handle 40.
And the cam pin 31 and the cam slot 42 constitute an interlocking mechanism that swings the pawl 30 in accordance with the swing of the reclining handle 40. The reclining handle 40 is urged in the direction of arrow A in FIG. 2 by a return spring (not shown), and is normally brought into contact with a stopper (not shown) and stopped at the position shown.

As shown in FIGS. 1, 4, 5 and 7,
A swing arm 46 is provided between the plate 18 and the spiral spring 27 on the support shaft 11 provided on the inner lower arm 10b.
The swing arm 45 is swingably supported through a round hole 45a, and is supported by the small diameter portion 11b at the other end of the support shaft 11 through a round hole 45a. The tip of each of the swing arms 45 and 46 is connected to a connecting pin 4 passing through the relief hole 16 formed in the lower arm 10 b and outside the pole 35.
A rotatable roller 49 is provided at the middle large-diameter portion of the connecting pin 48 and connected by the connecting pin 8. The guide pin 36 erected and fixed to the side surface of the tip of the pole 35 is
b through the escape hole 16, the tip of which is a swing arm 45.
Is engaged in the cam slot 47 formed in the cam groove.

As shown in FIG. 1 to FIG. 3 and FIG. 6, one end of an interlocking arm 50 is swingably supported by a small diameter portion 11b of a support shaft 11 provided on an outer lower arm 10a so as to be retained. The tip of the interlocking pin 51 slidably engaged with the elongated hole 50a of the tip of the interlocking arm 50 is
The pin 50 is engaged with a pin hole 41b formed at the other end of the pin 1 and is caulked, whereby the interlocking arm 50 is swung in conjunction with the swinging arm 41. As shown in FIGS. 1 to 3 and FIG. 7, both ends of the interlocking rod 55 to which the hook plates 56 and 57 are fixed are respectively connected to the lower arms 10a and 10b.
The supporting plate 11 is rotatably supported by a small-diameter portion 11b of the support shaft 11, and the bent portions at the tips of the hook plates 56, 57 are engaged with square holes 56a and 57a formed in the interlocking arm 50 and the swing arm 45, respectively. Have been combined. Thus, the swing arm 41 and the swing arms 45 and 46 swing in opposite directions in conjunction with each other.

Next, the operation of the above embodiment will be described. The reclining handle 40 is urged by the return spring,
2, the cam pin 31 of the outer lower arm 10a is located at a position closest to the support shaft 11 of the cam slot 42, and the roller 44 is a contact surface on the back side of the pole 30. By engaging with 30b, the tooth portion 30a at the tip of the pawl 30 is pressed and engaged with the ratchet teeth 21 of the upper arm 20, whereby the upper arm 20 is locked. In this state, the swing arms 45 and 46 on the inner lower arm 10b side are at the positions shown in FIG. 4, the guide pin 36 is located at the position closest to the support shaft 11 of the cam slot 47, and the roller 49 is The contact surface 3 on the back side of the pole 35
5b, the teeth 35a at the tip of the pawl 35 are pressed and engaged with the ratchet teeth 26 of the upper arm 25, whereby the upper arm 25 is also locked.

If the handle 40b is lifted against the urging force of the return spring and the reclining handle 40 is swung clockwise about the intermediate support shaft 13 to the position shown in FIG. The roller 44 is disengaged from the contact surface 30b of the pawl 30, the cam pin 31 is moved to a position away from the support shaft 11 in the cam slot 42, and the pawl 30 is disengaged from the ratchet teeth 21 at the tooth portion 30a. Rocking position. This allows the upper arm 20 to swing freely. At the same time, the link pin 51 and the link arm 5
0, the swing arms 45 and 46 swing counterclockwise via the interlocking rod 55 and the hook plates 56 and 57, and
And the roller 49 is in contact with the contact surface 3 of the pole 35.
5b, the cam pin 36 is connected to the support shaft 1 of the cam slot 47.
1 and moves the pole 35 to the tooth 35
a is swung to a position where it is detached from the ratchet teeth 26. Thereby, the upper arm 25 can also swing freely. In this state, the reclining angle of the upper arms 20, 25 and the seat back frame 29 is adjusted, and then the handle 40 is adjusted.
2 and 4, the pawls 30 and 35 return to the positions shown in FIGS. 2 and 4, and the teeth 30a and 35a engage with the ratchet teeth 21 so that the upper arm 20 and the upper arm 25 are engaged. The seat back frame 29 is locked.

In order to improve the load from the seat back frame side where the reclining mechanism OR is received,
The radius of the pitch circle of the ratchet teeth 21 about the support shaft 11 may be increased to reduce the load generated at the meshing portion between the teeth 30a of the pawl 30 and the ratchet teeth 21 as compared with the related art. Even if the pitch circle radius of the ratchet teeth 21 is increased in this manner, the intermediate support shaft 13 supporting the reclining handle 40 is located between the supporting shaft 11 and the pawl 30, and accordingly, the reclining handle 4
The length from the intermediate support shaft 13 which is the center of rotation of 0 to the mounting portion of the roller 44 does not become large, and the occupation area required for the swing of the reclining handle 40 does not increase. Accordingly, a vehicle seat with a reclining mechanism having a large weight and a high degree of freedom in arranging parts without increasing the load from the seat back frame side where the reclining mechanism is received, and without increasing the size of the reclining handle 40 as compared with the conventional case. Obtainable.

Next, a second embodiment shown in FIGS. 8 to 13 will be described. A pair of lower rails 6 fixed to the car body
As shown in FIG. 8, both side members 61a and 61b of the seat cushion frame 61 are supported so as to be adjustable in the front-rear direction.
Lower arms 70 and 75 are attached to the rear inside of 1b, respectively. As in the first embodiment, each lower arm 7
A pair of upper arms 20 and 25 are swingably supported in the support shaft 11 (see FIGS. 11 and 13) fixed to the reference numerals 0 and 75 via round holes 20a and 25a. At the top of the seat back frame 6
The lower ends of both side members 65a, 65b of No. 5 are fixed by screws. As in the first embodiment, each upper arm 2
0 and 25 are urged forward by spiral springs 22 and 27 (see FIGS. 11 and 13) whose inner ends are locked to the respective support shafts 11.

As shown mainly in FIGS. 9, 11 and 12, the lower arm 70 of the outer reclining mechanism OR
Is a pair of sheet metal lower arm main bodies 70a and lower arm covers 70b facing each other from inside and outside, and integrally fixed to form a thin box. A mounting stud 72 is outwardly welded and fixed to the outer surface of the lower arm body 70a, and the intermediate support shaft 13 that is welded and fixed through the lower arm cover 70b extends through a bush 71 that is welded and fixed to the lower arm body 70a. 7
The mounting stud 73 welded and fixed to Ob extends through a round hole 73b formed in the lower arm body 70a.
The ends of the intermediate support shaft 13 and the mounting studs 72 and 73 are fastened and fixed to the outer side member 61a via nuts 13a and 73a (the nuts of the mounting studs 72 are not shown), and thereby both members 70a constituting the lower arm 70. And 70b are integrally fixed to each other and attached to the outer side member 61a. These two members 70a
And 70b are pins provided in the hole 74 (pins 15a to be described later).
Are also fixed to each other.

The support shaft 11 is fixed by welding through the lower arm cover 70b, and the small diameter portion 11c beyond the step is supported through a support hole 70c formed in the lower arm main body 70a and is prevented from falling off by a retaining ring. The aforementioned spiral spring 22 is provided first. The upper arm 20 formed by stamping out a flat plate into a shape substantially the same as that of the first embodiment except that a projecting portion 68 described later is integrally formed is located in a thin box-shaped lower arm 70, and as described above. Support shaft 1 supported at both ends by members 70a and 70b on both sides
1 is swingably supported through a round hole 20a. Similarly to the first embodiment, the upper arm 20 is formed with an arc-shaped relief hole 23 through which the intermediate support shaft 13 passes, and the arc-shaped ratchet teeth 21 formed at the distal end edge of the fan-shaped portion are provided with:
The teeth 30a of the pawl 30, the base end of which is swingably supported at the middle large diameter portion of the pin 15a supported by both members 70a, 70b of the lower arm 70, are capable of engaging and disengaging.

As in the first embodiment, the intermediate support shaft 13 is located between the support shaft 11 and the pole 30,
The bush 71 supported coaxially with the third arm member 3 and located between the lower arm body 70a and the outer side member 61a.
, A reclining handle 40 is swingably supported via a bush 40c fixed to an intermediate portion. A swing arm 41 is swingably supported through a round hole 41a at a tip end of the intermediate support shaft 13 projecting inward from the lower arm cover 70b toward the inside of the vehicle body (toward the inner side member 61b). As in the first embodiment, the connecting pin 43 connecting the reclining handle 40 and the distal end of the swing arm 41 is provided with a roller 44 for engaging and disengaging with the contact surface 30b on the rear side of the distal end of the pawl 30. Have been. The cam pin 31 erected and fixed on the side surface of the tip of the pawl 30 passes through the relief hole 12 of the lower arm cover 70 b, and the tip is engaged in a cam groove 42 formed in the swing arm 41, and the reclining handle 40 An interlocking mechanism that swings the pole 30 according to the swing is configured. As in the first embodiment, the reclining handle 40 is urged by a return spring in the direction of arrow A in FIG. 9 and is normally stopped at the illustrated position.

As shown mainly in FIGS. 10 and 13,
The inner lower arm 75 and the support shaft 11, the plate 18, the upper arm 25, the pawl 35, the swing arm 45, the swing arm 46, etc., which are attached and supported to form the inner reclining mechanism IR, are formed by the shape of the lower arm 75 and the inner arm. Except for the mounting structure for the side member 61b,
Since the second embodiment is substantially the same as the first embodiment, the corresponding portions are denoted by the same reference numerals and detailed description thereof will be omitted. Also,
The interlocking rod 55 and the hook plates 56, 57 for interlockingly rocking the rocking arm 41 of the outer reclining mechanism OR and the rocking arm 45 of the inner reclining mechanism IR in the opposite direction are also substantially the same as in the first embodiment. Since they are the same, corresponding portions in FIGS. 9 to 11 and 13 are denoted by the same reference numerals, and detailed description is omitted.

Next, a description will be given of a support member 66 for reinforcing between the upper arm 20 and the seat back frame 65 attached to the upper arm 20, and its related members. As shown in FIG. 8, a bracket 67 fixed to an upper front side of a side member 65a outside the seat back frame 65 supports an upper end of a support member 66 via a support pin 67a so as to be swingable in the front-rear direction. , Are elastically urged forward by a spring (not shown). As shown in FIGS. 9 and 12, the vertical plate-shaped protrusion 68 integrally formed so as to extend forward from the lower front side of the outer upper arm 20 has an arc-shaped and fixed width centered on the support pin 67 a. Slot 6
8a are formed. The lower end of the support member 66 is formed in a bifurcated shape sandwiching the protruding portion 68, and an intermediate portion of a pin 69 provided laterally at the lower end is prevented from coming off through the elongated hole 68a. The pin 69 is slidable in the elongated hole 68a with a slight gap, and a spacer 69a is provided between both side surfaces of the protrusion 68 and the inner surface of the forked portion. When no external force is applied, the pin 69 is located at the front end of the elongated hole 68a by a spring for urging the support member 66 forward (see FIG. 9).
Since a and the upper arm 20 form a triangular truss, the strength of each of these integrally connected portions is improved.

In a normal operation state except that the seat back is greatly inclined to the rear side, as shown in FIGS. 8, 9 and 12, the protruding portion 68 and the lower end of the support member 66 are located in the lower arm 70. And a pin 69 formed in a spherical shape.
Are slidably engaged with mutually parallel portions of the inner surfaces of both members 70a, 70b of the lower arm 70, so that the lower end of the support member 66 and the protrusion 68 substantially move laterally. Being restrained.

As shown in FIGS. 8, 9 and 11, the anchor bracket 8 at the lower end of the seat belt 80 is attached to the distal end of the intermediate support shaft 13 projecting inward from the lower arm 70.
1 is rotatably mounted via a nut 81a. The upper end of the seat belt 80 is wound and supported by a seat belt winding device 83 attached to the upper end of a side member 65a provided with a support member 66, and the seat belt 8
0 The slutng 82 inserted in the middle part is the lower arm 75
Are held by an intermediate holding member 84 attached thereto by a nut 76 (see FIG. 10) provided in such a manner as to be capable of engaging and disengaging. This ensures that the occupant is held in the seat even in the event of a collision or the like.

The disengagement of the reclining mechanisms OR and IR by the operation of the reclining handle 40 in the second embodiment and the adjustment of the reclining angle of the seat back by this operation are substantially the same as those in the first embodiment. Omitted. Similarly, by increasing the pitch circle radius of the ratchet teeth 21 centering on the support shaft 11, the load generated at the meshing portion between the teeth 30a of the pawl 30 and the ratchet teeth 21 can be reduced as compared with the related art, so that the reclining is performed. The load from the seat back frame side where the mechanism is received is increased, and the effect is obtained that the reclining handle 40 can be lightened and the degree of freedom of component arrangement can be increased without increasing the size of the reclining handle 40 in comparison with the related art.

When the vehicle equipped with the reclining mechanism-equipped vehicle seat of the second embodiment collides, the inertia force applied to the occupant is provided with the seat belt winding device 83 via the seat belt 80. It joins the upper part of the seat back frame 65. Thereby, the teeth 30 of the pole 30
An impact load is applied to the meshing portion between the a and the ratchet teeth 21. As described above, since the load at this portion can be reduced as compared with the related art, the load from the seat back frame side where the reclining mechanism OR is received can be reduced. Is large, and the load from the seat belt 80 can be received without any problem.

In the second embodiment, the side members 65a
And the upper arm 20 and the support member 66 constitute a triangular truss, so that the strength and rigidity are increased and the impact load from the seat back frame 65 is transmitted without being absorbed, so that the load applied from the support shaft 11 to the lower arm 70 is increased. However, the lower arm bodies 70 on both sides of the box-shaped lower arm 70
The support shaft 11 supported by the lower arm cover 70b and the lower arm cover 70b causes the load to be shared between the two members 70a and 70b. Therefore, a bending force is applied to each of the members to cause deformation, and thus the ratchet teeth 21 of the upper arm 20 and the pole 3
There is no danger that the positional relationship between the 0 tooth portions 30a will be out of order and these meshes will be disengaged.

The lower end of the support member 66 engaged with the vertical plate-like projection 68 formed integrally with the upper arm 20 is slidably abutted on the inner surface of the box-shaped lower arm 70 so as to extend in the horizontal direction. Is restricted, the supporting member 66
Even if a lateral force is applied to the projecting portion 68 for some reason in addition to the compressive force applied to the projecting portion 68 from the outside, the lateral bending does not increase. Accordingly, the vertical plate-shaped projection 68 having a small lateral bending strength and torsional strength is not damaged by lateral bending or torsional deformation.

The lower end of the support member 66 is normally biased toward the front end of the elongated hole 68a by a spring to form a triangular truss, but can be swung rearward against the spring so that it can be seated. It does not interfere with getting on and off. Since the anchor bracket 81 at the lower end of the seat belt 80 is attached to the end of the intermediate support shaft 13 projecting inward from the lower arm 70, the seat belt 80 does not extend across the movement range of the lower portion of the support member 66, Therefore, there is no danger that the swinging of the support member 66 will be hindered by the occupant getting in and out of the vehicle, and the lower end of the support member 66 will not reach the front end of the elongated hole 68a, so that the reinforcing function cannot be sufficiently exhibited.

As described above, according to the vehicle seat with the reclining mechanism of the second embodiment, the limit in which the impact load applied to the seat back frame 65 can be received without damaging each part is greatly increased. Can be enhanced.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an outline of a first embodiment of a vehicle seat with a reclining mechanism according to the present invention.

FIG. 2 is a side view showing an outer (reclining handle side) reclining mechanism in a state where the pawl of the first embodiment is engaged.

FIG. 3 is a side view of FIG. 2 in a state where a pole is detached.

FIG. 4 is a side view showing the inner reclining mechanism in a state where the pawl of the first embodiment is engaged.

FIG. 5 is a side view of FIG. 4 in a state where the pole is detached.

FIG. 6 is a sectional view taken along line 6-6 in FIG. 2;

FIG. 7 is a sectional view taken along a line 7-7 in FIG. 4;

FIG. 8 is an overall perspective view showing an outline of a second embodiment of a vehicle seat with a reclining mechanism according to the present invention.

FIG. 9 is a side view showing an outer reclining mechanism of the second embodiment.

FIG. 10 is a side view showing the inner reclining mechanism of the second embodiment.

11 is a sectional view taken along line 11-11 of FIG. 9;

FIG. 12 is a sectional view taken along line 12-12 of FIG. 9;

FIG. 13 is a sectional view taken along a line 13-13 in FIG. 10;

[Explanation of symbols]

10a, 10b, 70, 75: lower arm, 11: support shaft, 13: intermediate support shaft, 20, 25: upper arm, 2
1, 26: ratchet teeth, 29, 65: seat back frame, 30, 35: poles, 30a, 35a: teeth,
40: Reclining handle, 65a: Side member, 66: Support member, 68: Projection, 68a: Slot, 7
0a: Lower arm body, 70b: Lower arm cover, 8
0: Seat belt.

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Kunio Nishiyama 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation (56) References JP-A-2-95304 (JP, A) JP-A-60-198107 (JP, A) JP-A-5-184431 (JP, A) JP-A-1-105553 (JP, U) JP-A-1-77533 (JP, U) (58) Fields investigated (Int. Cl. ⁷⁾ , DB name) A47C 1/025

Claims (6)

(57) [Claims] And 1. A pair provided on the seat cushion frame lower arm, is fixed to the <br/> lower portion of the seat back frame is swingably supported in the front-rear direction to the lower arm via a supporting lifting shaft and a pair of upper arm, said a Ppaa and ratchet teeth formed of a number of teeth formed in an arc shape in <br/> over arm about said support shaft, wherein are swingably supported by the front Symbol lower arm a recliner handle having a pole having a tooth portion for releasably engaging the ratchet teeth, the portion where the biasing force is close to the said pole given is swingably supported by the front kilometers Aamu in one direction, the pawl And a reclining handle is provided between the portions approaching each other, and the tooth portion of the pole is ratcheted by the swing of the reclining handle against the urging force. The reclining mechanism is provided with an interlocking mechanism that swings the pawl so that the tooth portion engages with the ratchet teeth by returning the reclining handle due to the urging force. the support shaft and the pawl seat reclining mechanism with the vehicle, characterized in that the swingably supported by the front kilometers Aamu through the support shaft parallel to the intermediate support shaft located between the. 2. The lower arm supporting the pole is formed in a box shape by a lower arm body and a lower arm cover integrally fixed to each other, and the support shaft is supported at both ends by the lower arm body and the lower arm cover.
2. The reclining mechanism according to claim 1, wherein the one upper arm is swingably supported by a portion from a portion supported by the support shaft to the ratchet teeth is located in the lower arm formed in a box shape. 3. With vehicle seat. 3. The pole of the seat back frame.
3. The vehicle seat with a reclining mechanism according to claim 1, wherein an upper end of a seatbelt is attached to an upper portion of a side member on the lower arm side that supports the lower arm. 4. 4. The pole of the seat back frame
A support member for reinforcing a side member on the lower arm side that supports the lower arm. The support member has an upper end portion attached to the side member so as to be swingable in the front-rear direction, and is elastically urged forward, and a lower end portion. 4. A slidable engagement with an arc-shaped long hole which is formed integrally with the upper arm and extends forward and extends in the front-rear direction. Vehicle seat with reclining mechanism. 5. The lower arm supporting the pole is formed in a box shape by a lower arm body and a lower arm cover integrally fixed to each other, and the support shaft is supported at both ends by the lower arm body and the lower arm cover.
Most of the one upper arm including the protruding portion formed in a vertically-oriented plate shape is swingably supported in the lower arm formed in a box shape in a normal operation state, and is supported by the protruding portion. 5. The vehicle with a reclining mechanism according to claim 4, wherein a lower end portion of the supporting member to be engaged is slidably abutted on mutually parallel inner surfaces of the box-shaped lower arm to restrain lateral movement. Sheet. 6. One end of the intermediate support shaft is connected to the pole.
The vehicle seat with a reclining mechanism according to claim 4 or 5, wherein an end protruding inward of the lower arm to be supported and being a lower side of the seat belt is attached to the one end of the intermediate support shaft.