JP2000236976A - Knuckle structure of seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a knuckle structure of a seat allowing a user to make the reclining operation of the backrest of a front seat from a rear seat easily. SOLUTION: This knuckle structure, mounted between the seat bottom 11 and the backrest 12 connected to the seat bottom 11 rotatably around a horizontal axis, is for setting an arbitrary reclining position of the backrest 12. The knuckle structure has a knuckle plate 3 relatively rotating around a connecting shaft 70 attached to the seat bottom 11, a lock means 5 mounted in the backrest 12 for locking and releasing the lock of the reclining position of the backrest 12 by engaging/disengaging the knuckle plate 3, and an operating means 6 for operating the lock means 5. The operating means 6 has a first operating band 63 projecting forward and a second operating band 64 projecting backward so that the lock means can be operated from both front and rear of the seat.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a knuckle structure of a seat interposed between a seat bottom as a seat and a seat back as a backrest.

[0002]

2. Description of the Related Art Conventionally, for example, a knuckle structure interposed between a seat bottom and a seat back provided on a vehicle seat has been known. This knuckle structure is for setting the tilting posture of the seat bottom pivotally supported around a horizontal axis extending in the vehicle width direction at the rear of the seat bottom, and includes a knuckle plate fixed to the seat bottom. And a locking means attached to the seat back corresponding to the knuckle plate, and an operation lever for operating the locking means.

[0003] The knuckle plate is provided with a plurality of locked teeth along a circular locus about the axis of the horizontal shaft, while the locking means engages with the locked teeth. A lock plate with pawls is provided. By engaging and disengaging the locking teeth of the lock plate with the locked teeth of the knuckle plate by operating the operation lever,
The seat back posture is changed and the set tilting posture is locked.

[0004]

However, in the conventional knuckle structure as described above, the operating lever is protruded forward from the knuckle plate, whereby the seat occupant of the seat operates the operating lever. It is easy to do. That is, the tilting posture of the seat back on which the user is sitting can be easily changed.

[0005] However, for example, when a person sitting on the rear seat wants to increase the space in front of the seating position without a seated person on the front seat, the seat back of the front seat is tilted forward. However, such forward operation has a problem in that the operation lever of the front seat protruding forward must be operated by leaning out of the body, and the operation is very difficult. Was.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has a knuckle structure for a seat which allows the seat back of the front seat to be easily tilted even from the rear seat. It is intended to provide.

[0007]

A knuckle structure for a seat according to the first aspect of the present invention is provided between a seat bottom and a seat back rotatably connected to the seat bottom about a horizontal axis. A knuckle structure of the seat for setting an arbitrary tilting posture of the seat back, and a knuckle plate that relatively rotates around the horizontal axis provided on one of the seat bottom and the seat back,
A locking means provided on the other side for locking and unlocking the tilting posture of the seat back by engaging and disengaging with respect to the knuckle plate, and an operating means for operating the locking means; Is characterized in that it can be operated from both the front and rear of the seat.

According to the knuckle structure of the seat, the seat back normally maintains the set tilting posture because the locking means is engaged with the knuckle plate.
The seat occupant of the seat bottom can leave his back in the seat back. Then, when changing the tilting posture of the seat back, the lock of the locking means may be released by operating the operating means. Then, since the seat back can be rotated around the horizontal axis, the tilting posture of the seat back can be arbitrarily selected. After the tilting posture of the seat back is selected, the operating lever is operated to perform locking by the locking means, so that the selected tilting posture of the seat back is maintained again.

Since the operating means is configured to be operated from both the front and rear of the seat,
Not only the person sitting on the seat, but also the person sitting on the rear seat, can easily change the tilting posture of the front seat, and as in the past, leaning in the direction of the front seat. There is no need to perform complicated operation of the operating means, which is performed by embarking.

According to a second aspect of the present invention, there is provided a seat knuckle structure according to the first aspect, wherein the knuckle plate is provided along a circular locus about the axis of the horizontal axis. A first locking plate having a plurality of locked teeth, the locking means being provided with locking teeth that are removably engaged with the locked teeth by rotating about a first support shaft. And a second lock plate that locks the meshing state of the first lock plate with the knuckle plate by rotating about the second support shaft, wherein the operating means is provided at a substantially intermediate position with the second support shaft. The first and second lock plates are pivotally supported so as to be rotatable around, and the first and second lock plates are moved in the lock direction by turning in one direction, and the first and second lock plates are turned by turning in the other direction. Lock An operating lever for moving the removal direction, and is characterized in that it has a biasing means for biasing the operation lever in the locking direction.

According to the knuckle structure of the seat, when the tilting posture of the seat back is locked, the meshing teeth of the first lock plate mesh with the meshed teeth of the knuckle plate, and the meshing state is changed to the second locking state. The seat back is further locked by the plate, and the operation lever is urged in the locking direction by the urging force of the urging means, so that the set tilting posture of the seat back is reliably maintained.
When the tilting posture of the seat back is changed, the first and second lock plates are respectively moved in the unlocking direction by operating the operation lever in a predetermined direction and rotating about the second support shaft. In addition, the tilting posture of the seat back can be changed by rotating around the second support shaft and bringing each lock plate into the unlocked state.
By stopping the operation of the operating lever in a state where the predetermined tilting posture of the seat back is selected, the operating lever is returned to the locking direction by the urging force of the urging means, whereby the seat back is maintained in the tilting posture again. State.

Since the operation lever is rotatably supported at an intermediate position about the second support shaft, a person sitting on the front seat can move one end of the operation lever forward. The tilted locked state of the seat back can be released by operating the seat lever, and the occupant of the rear seat can also unlock the seat back by operating the other end of the operating lever backward. it can. By employing such an operation lever, a knuckle structure that can be easily operated from the front and rear seats can be simplified.

A knuckle structure for a seat according to a third aspect of the present invention is the knuckle structure for a seat according to the second aspect, wherein both ends of the operation lever are provided with a string for front operation and a string for rear operation. Are provided, respectively.

According to the knuckle structure of the seat, the locked state of the tilted posture of the seat back can be released by the occupants of the front and rear seats respectively pulling the cords.

[0015]

FIG. 1 is a perspective view showing one embodiment of a vehicle seat to which a knuckle structure of the present invention is applied. In FIG. 1, the XX direction is the width direction, and the Y-
The Y direction is referred to as the front-rear direction. In particular, the −X direction is left, the + X direction is right, the −Y direction is forward, and the + Y direction is rear (the same applies to FIGS. 2 and 3).

As shown in these figures, a vehicle seat 1 has a seat bottom 11 provided on a floor F so as to be able to move back and forth, and a rear end of the seat bottom 11 capable of changing a tilting posture. The seat back 12 is provided.

The seat bottom 11 is provided with a pair of widthwise sliders 13 attached to the floor F so as to extend in the front-rear direction.
It is supported by. The slider 13 includes a lower channel 14 fixed to the floor F, and the lower channel 14.
The seat 1 can move back and forth by fixing the bottom of the seat bottom 11 to the pair of upper channels 15.

The seat bottom 11 of the seat 1 is
The knuckle structure 2 according to the present invention is interposed between one side in the width direction of the rear end and the lower end of the seat back 12.

FIG. 2 is an exploded perspective view showing an embodiment of the knuckle structure according to the present invention, and FIG. 3 is an assembled perspective view thereof. 4 and 5 are side sectional views of the knuckle structure. FIG. 4 shows a state in which the tilting posture of the seat back 12 is locked, and FIG. 5 shows a state in which the lock is released. ing. In FIGS. 4 and 5, illustration of the holding plate 35 is omitted to avoid complication of the drawings.

As shown in these figures, the knuckle structure 2
Is a knuckle plate 3 fixed to the rear end side of the seat bottom 11 with bolts, and a knuckle plate 3 fixed to the seat back 12 with bolts, and is rotatable around a connection shaft (horizontal shaft) 70 to the knuckle plate 3. , A locking means 5 interposed between the knuckle plate 3 and the bracket 4, and an operating means 6 for operating the locking means 5.

The knuckle plate 3 has a first hole 81 at an upper portion into which the connecting shaft 70 is inserted, and a semicircular arc edge centered on the center of the first hole 81 at the upper edge. A plurality of locked teeth 31 formed at a predetermined pitch are provided on the circular arc edge.

The lower portion of the knuckle plate 3 extends downward from the arc-shaped portion so as to extend downward, and the knuckle plate 3 is fixed to the seat bottom 11 at each corner in the front-rear direction by bolting. A pair of second holes 82 are formed.

The bracket 4 has the first position at the lower position.
The knuckle plate 3 has a third hole 83 corresponding to the hole 81.
Is inserted into the third hole 83 and the first hole 81 from the right side to prevent the knuckle plate 3 and the bracket 4 from being connected to each other in a state in which the knuckle plate 3 and the bracket 4 can relatively rotate around the connection shaft 70. It has become.

The connecting shaft 70 has a shaft main body 70a, a flange 70b integrally formed on the base end side (right side in FIG. 2) of the shaft main body 70a, and a concentric projection from the base end surface of the flange 70b. The provided forked bifurcated shaft 70c and the shaft main body 70
a of a bush 70d which is fitted on the tip side of the flange portion 70b in a sliding contact state. Bush 70
The thickness d in the center direction is set so that d is in sliding contact with the inner peripheral surface of the first hole 81 in a state where the connection shaft 70 is inserted, so that the rotation of the knuckle plate 3 around the connection shaft 70 is further improved. It is going to be done smoothly.

The length of the shaft body 70a is set to be slightly longer than the thickness of the knuckle plate 3, the bracket 4, and the pressing plate 35 described later.
0a is the third hole 83 of the bracket 4, the knuckle plate 3
Of the first hole 81 and a thirteenth hole 81 of the holding plate 35 described later.
3 is inserted into the thirteenth hole 8
13 so as to protrude outside.

An E-ring 70e is attached to a portion of the knuckle plate 3 protruding outside from the thirteenth hole 813, whereby the connecting shaft 70 is fitted into each hole of the bracket 4, the knuckle plate 3 and the holding plate 35. It is locked in the inserted state. And the shaft body 70a is the third
The flange portion 70b is welded to the bracket 4 while being fitted into the hole 83, so that the bracket 4 and the connecting shaft 70 co-rotate around the axis.

The bifurcated shaft 70c is for mounting a central portion of a spiral spring 91 for urging the seat back 12 forward. On the other hand, knuckle plate 3
A lock shaft 32 protruding inward (to the right in FIG. 2) is provided at a lower portion of the lock shaft 32. And the spiral spring 91
The center portion is inserted into the split of the forked shaft 70c, and the bent portion at the tip is locked by the locking shaft 32 to apply an urging force to the connecting shaft 70 in the counterclockwise direction around the axis. Thus, the seat back 12 integrated with the connecting shaft 70 via the bracket 4 is always urged forward.

The bracket 4 is provided with a shaft (first) for supporting a component of the locking means 5 to be described later at a position slightly above the upper edge of the knuckle plate 3 in a state where the knuckle plate 3 is stacked. A fourth hole 84 and a fifth hole 85 for passing the first support shaft 71 and the second support shaft 72) are formed. The fourth hole 84 is formed at a position in front of the bracket 4, and the fifth hole 85 is formed at a position behind the bracket 4.
The hole is drilled at a position slightly higher than 4. A first support shaft 71 and a second support shaft 72 are fitted into the fourth and fifth holes 84 and 85 respectively from the right side of the bracket 4. Further, a predetermined number of fixing holes 85a for fixing the bracket 4 to the seat back 12 are formed in appropriate places of the bracket 4, and the bracket 4 is inserted through these holes.
The bracket 4 is fixed to the seat back 12 by bolting it to the side surface of the seat back 12.

The lock means 5 includes a first lock plate 51 rotatably supported around a first support shaft 71 and a second lock plate rotatably supported around a second support shaft 72. 52 and the first and second lock plates 5
And a link plate 53 for operating the members 1 and 52 in cooperation with each other.

The first lock plate 51 is formed to be long in the front-rear direction, and has a fourth hole 84 of the bracket 4 at the front end.
And a sixth hole 86 corresponding to
At the rear end of the lock plate 51, a locking tooth 51b that meshes with the locked tooth 31 of the knuckle plate 3 is formed at a lower edge position, and a mountain-shaped protruding piece 51c is formed at the upper edge at a mountain shape with a wide skirt. A protruding lock piece 51a is provided.

The first lock plate 51 is mounted on the bracket 4 so as to be rotatable around the first support shaft 71 by being fitted around the first support shaft 71 that penetrates through the fourth hole 84, so that the first lock plate 51 is supported by the first support plate 71. By rotating clockwise around the shaft 71, the locking teeth 51 b of the locking piece 51 a are set to the locking posture in which the locking teeth 51 b mesh with the locked teeth 31 of the knuckle plate 3, and counterclockwise around the first support shaft 71. By rotating in the direction, the lock is set to the unlocked posture in which the engagement is released. The lock piece 51a of the first lock plate 51 has a columnar first cylindrical protrusion 5 protruding leftward by the thickness of the link plate 53.
1d is protruded.

The second lock plate 52 has an annular main body 52a having a seventh hole 87 formed at the center thereof, and a cam piece 52b projecting radially downward from the peripheral surface of the annular main body 52a. It consists of The second lock plate 52 is rotatably supported around the second support shaft 72 by the seventh hole 87 being externally fitted to the second support shaft 72 protruding leftward from the knuckle plate 3. It is supposed to be.

In the second lock plate 52, as shown in FIG. 4, the cam piece 52b hangs down from the annular main body 52a.
1c, and a lock release posture in which the cam piece 52b is rotated clockwise around the second support shaft 72 to separate the cam piece 52b from the chevron piece 51c, as shown in FIG. The posture can be changed between.

Further, the second lock plate 52 is provided with a columnar second columnar projecting piece 52c projecting leftward from the cam piece 52b. This second cylindrical protruding piece 52c
The first cylindrical projection 51d is linked to a link plate 53 described in detail below.

The link plate 53 is for operating the first and second lock plates 51 and 52 in cooperation with each other, and has a plate-like plate body 53a.
And a U-shaped piece 53b projecting rearward from the rear edge of the plate body 53a and having a U-shape in plan view. An eighth hole 88 corresponding to the seventh hole 87 of the second lock plate 52 is formed in an upper portion of the plate main body 53a, and a second position of the second lock plate 52 is formed in a lower position of the eighth hole 88. A ninth hole 89 that is fitted to the two cylindrical protrusion 52c is formed. Further, a slot-shaped tenth hole 810 corresponding to the first cylindrical protruding piece 51d of the first lock plate 51 and extending in the front-rear direction is formed below the ninth hole 89 of the plate body 53a. Has been established.

The link plate 53 has its eighth
With the hole 88 fitted into the distal end of the second support shaft 72 that has passed through the seventh hole 87 of the second lock plate 52, the second
The second cylindrical protruding piece 52c of the lock plate 52 has a ninth hole 89.
And the first cylindrical protruding piece 51d of the first lock plate 51 is fitted into the tenth hole 810, whereby the first lock plate 51 can co-rotate with the second lock plate 52 around the second support shaft 72. It has become.

The tenth hole 810 has an arc hole 810a along an arc locus centered on the center of the eighth hole 88 and an arc formed at the rear end of the arc hole 810a and having a distance to the hole center of an arc. The lock release hole 810b is smaller than the hole 810a by the length of the locking teeth 51b. Arc hole 81
0a and the lock release hole 810b are
The first first cylindrical projections 51d are smoothly communicated with each other so as to be able to relatively smoothly move between these holes.

Then, the first cylindrical projection 51d is formed in the circular hole 81.
0a, the locking teeth 51b of the first lock plate 51 mesh with the locked teeth 31 of the knuckle plate 3, thereby preventing the bracket 4 from rotating around the connection shaft 70. become. By rotating the link plate 53 clockwise around the first support shaft 71 in this state, the first columnar projecting piece 51d moves to the lock release hole 810b, whereby the first support shaft 71 of the first lock plate 51 is moved. The engagement of the locking teeth 51b with the locked teeth 31 is released by the rotation in the counterclockwise direction. When the engagement of the locking teeth 51b with the locked teeth 31 is released, the bracket 4 becomes rotatable around the connection shaft 70, whereby the tilting posture of the seat back 12 can be changed. It is.

The U-shaped piece 53 b projecting from the link plate 53 is used to connect the link plate 53 to the first support shaft 71.
This is for connecting the operation means 6 for rotating around. This U-shaped piece 53b is
The orthogonal piece 53c is provided with an orthogonal piece 53c extending in the vertical direction perpendicular to a, and a parallel piece 53d protruding forward from the left edge of the orthogonal piece 53c and parallel to the plate body 53a.
An eleventh hole 811 in which the lower end of the coil spring 92 is locked is formed in the upper part of the orthogonal piece 53c, and a twelfth hole made of a screw hole for fixing the operating means 6 is formed in the parallel piece 53d. 812 are screwed in a pair in the upper and lower directions.

The coil spring 92 is provided on the link plate 5
As shown in FIG. 3, the lower end of the extended state is locked in the eleventh hole 811 and the upper end is locked in place above the bracket 4, as shown in FIG. As a result, the link plate 53 has the second support shaft 7
An urging force is applied in two counterclockwise directions.

In the present embodiment, the first hole 81 is inserted into the bush 70d of the connection shaft 70 which is inserted in the third hole 83 of the bracket 4 while being prevented from rotating, so that the knuckle plate 3 is And a sixth hole 86 and a seventh hole 8 in the first and second support shafts 71 and 72 fitted in the fourth and fifth holes 84 and 85, respectively.
The first and second lock plates 51 and 52 are mounted on the bracket 4 by the outer fitting 7 being in sliding contact with the bracket 7, and the eighth hole 88, the ninth hole 89 and the tenth hole 810 are respectively provided on the second support shaft. 72, the second cylindrical projection 52c and the first
In a state of being externally fitted to the cylindrical protruding piece 51d, a holding plate 35 is mounted on the bracket 4 via the knuckle plate 3 in order to stabilize the mounting state.

The holding plate 35 has a fan-shaped holding plate body 36 having a leading edge set to a radius of curvature substantially the same as the leading edge of the knuckle plate 3, and projects radially from the leading edge of the holding plate body 36. And a protruding plate 37 provided.
The protruding plate 37 is formed so as to protrude outward (to the left in FIGS. 2 and 3) by the thickness of the link plate 53 from the holding plate main body 36, thereby forming the knuckle plate 3. A link plate 53 can be interposed between the projecting plate 37 and the first and second lock plates 51 and 52 with the holding plate 35 mounted on the bracket 4.

The essential parts of the holding plate body 36 include:
The first for inserting the tip of the shaft body 70a of the connecting shaft 70
Three holes 813 are drilled, and a fourteenth hole 814 and a fifteenth hole 815 for penetrating the first support shaft 71 and the second support shaft 72 are formed in the protruding plate 37.
The shaft main body 70a of the connecting shaft 70 is inserted into the three holes 813, and the E-ring 70e is mounted on the distal end thereof. The first and second support shafts 71,
By caulking the respective distal ends while the 72 is inserted, the holding plate 35 is attached to the bracket 4 via the link plate 53, the knuckle plate 3, the first lock plate 51, and the second lock plate 52. Has become.

The operating means 6 includes a first operating lever 61 extending downward from a substantially middle position in a vertical direction of a lever body 60 extending vertically and a second operating lever 62 extending upward from the substantially middle position. A first operating band 63 attached to the lower end of the first operating lever 61 and extending forward.
And a second operating band 64 attached to the upper end of the second operating lever 62 and extending rearward. At a substantially intermediate position of the lever body 60, a pair of upper and lower 16th
Holes 816 are formed, and the screw body 65 is screwed into each of the sixteenth holes 816 and screwed to the twelfth hole 812 so that the lever main body 60 is fixed to the link plate 53.

The first and second operation levers 61, 62
A long hole 66 extending vertically is drilled at the tip of
The first and second operation bands 63 and 64 are formed by inserting a long band material into these long holes 66 to form a ring.
It is formed by sewing in a state where the abutted portion of each end is laminated on the center of the band original body. The first operation band 63 is used for grasping and operating the occupant of the seat 1 when the occupant of the seat 1 wants to change the tilting posture of the seat back 12. When the tilting posture of the seat back 12 of the seat 1 is changed, the seat back 12 is gripped and operated.

The operation of the present invention will be described below with reference to FIGS. First, as shown in FIG. 4, when the lock unit 5 is set in the locked state, the link plate 53 generates an urging force directed in the counterclockwise direction around the second support shaft 72 by the urging force of the coil spring 92. As a result, the first cylindrical projection 51d of the first lock plate 51 is positioned in the arc hole 810a of the link plate 53, and the second cylindrical projection 51d is rotated by the counterclockwise rotation about the second support shaft 72. The link plate 53 of the second lock plate 52 due to the piece 52c being fitted into the ninth hole 89
The cam piece 52b of the second lock plate 52 presses the top of the chevron projection 51c of the lock piece 51a of the first lock plate 51 by the integral rotation of the first lock plate 51, whereby the lock provided at the rear end of the first lock plate 51 The locking teeth 51b of the piece 51a mesh with the locked teeth 31 of the knuckle plate 3, and the rotation of the bracket 4 around the connection shaft 70 is locked, that is, the posture change of the seat back 12 is prevented. Has become.

In this state, the first operation band 63 of the operation means 6 is pulled forward (to the left in FIG. 4), or the second operation band 64 is pulled rearward, and the lever body 60 is pulled.
Is rotated clockwise about the second support shaft 72, the link plate 53 integrated with the lever body 60 also moves to the second support shaft 7.
The first lock plate 51 is rotated in the clockwise direction by two rotations, whereby the rotation restriction of the first lock plate 51 by the cam piece 52b is released, and the first cylindrical protruding piece 51d is turned into the tenth hole 810.
Are relatively moved from the arc hole 810a toward the lock release hole 810b, and at this time, the first lock plate 51 rotates counterclockwise around the first support shaft 71 as shown in FIG. Since the engagement of the tooth 51b with the locked tooth 31 is released, the bracket 4 is rotatable around the connection shaft 70, whereby the tilting posture of the seat back 12 can be changed.

Therefore, the seat back 12 is rotated around the connecting shaft 70 with one of the first operation band 63 and the second operation band 64 pulled out, and the seat back 1 is moved.
Two desired tilting postures can be selected.

After the desired tilting posture of the seat back 12 is selected, the operation bands 63 and
4 release the link plate 53 from the coil spring 9
2 rotates counterclockwise around the second support shaft 72 due to the urging force of the second support shaft 72.
The first lock plate 51 is rotated clockwise around the first support shaft 71 by the relative movement toward the first support plate 71 and the pressing of the top of the chevron projection 51c by the cam piece 52b.
1b meshes with the locked tooth 31 and the connecting shaft 7 of the bracket 4
The locked state in which the rotation around zero is prevented is achieved, and the selected seat back 12 is maintained in the tilted posture.

According to the present invention, as described in detail above, the lever body 60 of the operating means 6 laid on the locking means 5 for adjusting the tilting posture of the seat back 12 has the first operating band 63 directed forward. Is provided at the lower end of the first operation lever 61, and the second operation band 64 is provided at the upper end of the second operation lever 62 so as to be directed rearward. It is possible to easily operate the seat back from the rear seat, and in particular, it is possible to solve the inconvenience that it was difficult to change the tilting posture of the seat back 12 of the front seat from the rear seat. It is convenient.

The present invention is not limited to the above embodiment, but includes the following contents.

(1) In the above embodiment, the first end of the lever body 60 of the operating means 6 is provided as a string at each end.
And second operation bands 63 and 64 are provided,
Instead of the operation bands 63 and 64, ordinary strings or chains may be employed. In the present invention, such a cord is not indispensable and may not be provided. When no string is provided, the first and second operation levers 61 and 62 are directly operated.

(2) In the above-described embodiment, each of the operation bands 63 and 64 is formed by sewing a long band base material into a ring shape so as to have a predetermined length. Instead of this, a buckle may be attached to one end of the band body to lock the other end. By doing so, the operation bands 63 and 64 are adjusted according to the physique of the occupant and the distance between the rear seat and the front seat.
Can be appropriately adjusted, and the operability of the operating means 6 is improved.

(3) In the above embodiment, the bracket 4 and the connecting shaft 70 are co-rotated around the axis by being welded to each other. The protrusion 70 is not limited to being welded. For example, a convex portion is provided on one of the inner peripheral surface of the bracket 4 and the outer peripheral surface of the shaft main body 70a, and the other side corresponds to the convex portion. Provided a concave part,
The projections may be fitted into the depressions so that both of them rotate together.

[0055]

According to the seat knuckle structure of the first aspect of the present invention, the operating means for setting and changing the tilting posture of the seat back can be operated from both the front and rear of the seat. As a result, not only a person sitting on the seat but also a person sitting on the rear seat can easily change the tilting posture of the front seat,
It is possible to eliminate the troublesome operation of the operation means, which is performed by leaning forward in the direction of the front seat as in the related art.

According to the seat knuckle structure of the second aspect of the present invention, when the tilting posture of the seat back is locked, the meshing teeth of the first lock plate mesh with the meshing teeth of the knuckle plate. This meshing state is further locked by the second lock plate, and the operating lever is urged in the locking direction by the urging force of the urging means, so that the set tilting posture of the seat back can be reliably maintained. . When the tilting posture of the seat back is changed, the first and second lock plates are respectively moved in the unlocking direction by operating the operation lever in a predetermined direction and rotating about the second support shaft. In addition, the tilting posture of the seat back can be easily changed by turning around the second support shaft and bringing each lock plate into the unlocked state.

The operation lever is rotatably supported at an intermediate position about the second support shaft, so that a person sitting on the front seat can move one end of the operation lever forward. The tilted locked state of the seat back can be released by operating the seat lever, and the occupant of the rear seat can also unlock the seat back by operating the other end of the operating lever backward. it can. By employing such an operation lever, a knuckle structure that can be easily operated from the front and rear seats can be simplified.

According to the knuckle structure of the seat according to the third aspect of the present invention, since the operation cords are provided at both ends of the operation lever, the seats of the front and rear seats pull the cords so that the seat back can be closed. The locked state of the tilting posture can be released, which is effective in improving the operability of the operation lever.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a vehicle seat to which a knuckle structure of the present invention is applied.

FIG. 2 is an exploded perspective view showing one embodiment of a knuckle structure according to the present invention.

FIG. 3 is an assembled perspective view of the knuckle structure of FIG. 2;

FIG. 4 is a side sectional view of the knuckle structure, showing a state in which a tilted posture of the seat back is locked.

FIG. 5 is a cross-sectional view of the knuckle structure in a side view, showing a state in which the lock of the tilting posture of the seat back is released.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Seat 11 Seat bottom 12 Seat back 2 Knuckle structure 3 Knuckle plate 4 Bracket 5 Locking means 6 Operating means 63 First operating band 64 Second operating band 70 Connecting shaft

Claims (3)

[Claims] 1. A knuckle for a seat, which is interposed between a seat bottom and a seat back rotatably coupled to the seat bottom about a horizontal axis, for setting an arbitrary tilting posture of the seat back. A knuckle plate provided on one of the seat bottom and the seat back, the knuckle plate being relatively rotated around the horizontal axis, and a knuckle plate provided on the other, and being disengaged from the knuckle plate. Locking means for locking and unlocking the tilting posture of the back and operating means for operating the locking means are provided, and the operating means is configured to be operable from both the front and rear of the seat. A knuckle structure for a seat, characterized in that: 2. The knuckle plate has a plurality of locked teeth provided along a circular locus about the axis of the horizontal axis, and the locking means is provided around a first support shaft. A first lock plate provided with locking teeth that removably mesh with the locked teeth by rotating, and a first lock plate meshing with the knuckle plate by rotating about a second support shaft A second lock plate for locking a state, wherein the operating means is rotatably supported about the second support shaft at a substantially intermediate position, and is rotated in one direction by the first and second operating means. An operation lever for moving the second lock plate in the lock direction and moving the first and second lock plates in the lock release direction by rotating in the other direction, and a biasing means for biasing the operation lever in the lock direction And have The knuckle structure for a seat according to claim 1, wherein: 3. The knuckle structure for a seat according to claim 2, wherein a string body for front operation and a string body for rear operation are provided at both ends of the operation lever.