JP2000158986A - Reclining device for seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily prostrate a seat back forward. SOLUTION: In this reclining device, a first bracket for a seat bottom S1 and a second bracket 3 for a seat back S2 are connected to be relatively turned around a camshaft 6. The second bracket 3 is formed from an internal gear ratchet 34 with internal teeth, while the first bracket is formed with a pair of arc-shaped guide members 22 point symmetrically with respect to a camshaft. A cam 5 provided around the cam shaft 6 and a pair of lock gears 4 having pawl teeth 41a are installed between the respective guide members 22, while turning of the cam 5 oppositely moves the respective lock gears 4 to allow meshing of the pawl teeth 41a with the internal gear ratchet 34. The camshaft 6 is turnably operated between a lock position and a lock release position with an operation lever 7. An energizing force of a coil spring 77 energizes the operation lever 7 to the lock position. The second bracket 3 is provided with a circular arc-shaped stopper for holding the operation lever 7 at the lock release position when the seat back S2 has a reclining posture within a prescribed range.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat back which is tiltably connected to a rear portion of a seat bottom and a seat which is mounted on a connection portion between the seat bottom and the seat back so as to adjust a tilt angle of the seat back. The present invention relates to a reclining device.

[0002]

2. Description of the Related Art Conventionally, a seat reclining device (recliner) as described in Japanese Patent Application Laid-Open No. Hei 8-214978 is known. The recliner is basically composed of a lower arm protruding from a rear end of a seat bottom and an upper arm protruding from a lower end of a seat back and rotatably connected to the lower arm around an operation axis. It has a configuration. A ratchet structure is interposed between the two arms. The ratchet structure includes an internal ratchet formed on the upper arm, a pair of bulging portions bulging on the lower arm corresponding to the internal ratchet, and It comprises a guide groove formed between a pair of bulging portions, and a pair of claw members guided by the guide groove and movably fitted in opposite directions.

[0003] The claw tooth member is provided at a point symmetrical position around the operation axis in the internal tooth ratchet. The position can be changed between a meshing position meshed with the tooth ratchet and a release position where meshing with the internal tooth ratchet is released. Then, by setting the claw tooth member at the meshing position, the seat back is prevented from rotating around the operation axis and a predetermined tilting posture is maintained, while the claw tooth member is set at the release position. Thereby, the seat back is brought into a state where the tilting posture can be changed by turning it around the operation axis.

[0004]

By the way, in the above-mentioned conventional recliner, the operating lever is urged by a predetermined urging means in the direction in which the pawl member meshes with the internal tooth ratchet. Therefore, when changing the tilting posture of the seat back, the operating lever must be operated against the urging force of the urging means during the operation. In the case of simply adjusting the tilt angle of the seat back, the operation lever is operated in a very short time, so that the operation of the operation lever against the urging force of the urging means does not become difficult, but the seat In the tilting operation of the back,
In some cases, the seat back of the front seat must be continuously moved forward to get on and off the rear seat. In such a case, for example, the seat back set in the standing posture is tilted forward by about 90 °. There must be. Therefore, during the forward operation, it is necessary to set the operation lever to the operation position against the urging force of the urging means, which has a problem that it is very troublesome.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to provide a seat reclining device capable of easily performing a forward tilting operation of a seat back.

[0006]

According to a first aspect of the present invention, there is provided a seat reclining device provided at a connecting portion between a seat bottom and a seat back connected to the seat bottom so as to be tilted within a predetermined range. A biasing structure of the operating lever in the reclining seat configured to lock and unlock the tilting posture of the seat back arbitrarily set within the above range by operating the operating lever. A fixed first bracket and a second bracket fixed to the seat back are provided, and the first bracket and the second bracket are formed in one of the concave portions and the other in the concave portion. The protrusions are fitted together so as to be relatively rotatable by fitting each other, and an inner tooth ratchet is formed on the inner peripheral surface of the recess,
The protrusions are formed by a pair of half-split protrusions having mutually parallel and mutually facing slide-contact surfaces, and are slidably fitted between the slide-contact surfaces of each of the half-split protrusions in a sliding contact state, and A pair of lock gears having claw teeth meshing with the internal tooth ratchet are provided on tip surfaces opposite to each other, and a cam that rotates around a cam shaft and moves the pair of lock gears in opposite directions is provided. The first and second brackets each have a center hole formed in a center portion of the relative rotation, the cam shaft is inserted into the center hole, and the pawl teeth are formed on the internal ratchet. An operation lever for rotating the camshaft is provided between a locked position where the engagement is performed and an unlocked position where engagement of the claw teeth with the internal ratchet is released, and the operation lever is provided with an urging means. By power And a lock release holding means for holding the operation lever at the lock release position when the seat back is in a tilted position within a predetermined range. Is what you do.

According to this recliner, since the pawl teeth of the pair of lock gears are normally meshed with the internal ratchet, the rotation of the seat back around the cam shaft is locked, and the predetermined tilting posture is set. Is maintained. By rotating the camshaft in a predetermined direction by operating the operation lever, a cam integrated with the camshaft rotates in a predetermined direction, and the rotation causes the pair of lock gears to approach each other while being guided by the guide member. In the direction of the arrow, thereby releasing the engagement of the pawl teeth of the lock gears with the internal ratchets.
The bracket and the bracket can be rotated relative to each other around the cam axis, and the seat back integrated with the second bracket is turned to a desired tilting posture by rotating the same.

Then, by releasing the gripped operating lever in a state where the desired seat back tilting posture is selected, the operating lever is shifted to the locked position by the urging force of the urging means. Move in the direction away from each other while being guided by the guide member, and the pawl teeth mesh with the internal tooth ratchet, so that the rotation of the second bracket around the cam axis is locked, and the tilting of the seat back integrated with the second bracket is performed. The posture is maintained.

When the seat back is in a tilted position within a predetermined range, the lock release holding means for holding the phase of the operation lever at the lock release position is provided. By providing lock release holding means to function in the range,
The unlocked state of the operation lever is maintained even if the user releases his / her hand from the operation lever held when the seat back is moved forward. Therefore, when the seat is in the front seat, when operating the seatback forward to get on and off the rear seat of the occupant, the operation lever is continuously operated to the unlock position against the urging force of the urging means. There is no necessity, and the forward operation of the seat back is facilitated accordingly.

The unlocking position of the operating means is not limited to the range in which the seatback is moved forward, but, for example, a predetermined range of the reclining posture in which the seatback is moved backward is adopted as the unlocking position. May be. By doing so, the reclining posture of the seat back can be switched stepwise between a plurality of predetermined steps.

According to a second aspect of the present invention, in the seat reclining device according to the first aspect, the operating lever is provided around a support shaft provided on the first bracket in parallel with the cam shaft. A link arm is provided between the operation lever and the cam shaft so as to rotate the cam shaft in conjunction with the rotation operation of the operation lever. When the seat back is in a tilted position within a predetermined range, the arc as the unlocking holding means concentric with the cam shaft and protruding so as to interfere with the operating lever and maintain the unlocked position of the operating lever. It is characterized in that a projection is provided.

According to this recliner, by operating the operation lever to the unlock position, the operation of the operation lever is transmitted to the cam shaft via the link arm, and the engagement of the pawl teeth with the internal ratchet is released. This allows the seat back to rotate about the cam axis. Then, in this state, by tilting the seat back toward a predetermined range and rotating the second bracket, the arc projection of the second bracket and the operation lever interfere with each other, thereby being in the unlocked position. Since the rotation of the operation lever around the support shaft is prevented, the lock release position is maintained even if the operation lever is released.

As described above, the operation lever is pivotally supported by the first bracket so as to be rotatable around the support shaft, and the rotation of the operation lever is transmitted to the cam shaft via the link arm, while being transmitted to the second bracket. By providing an arc-shaped projection for maintaining the unlocked position of the operation lever, a so-called lock release maintenance can be performed in a predetermined rotation range of the seat back so that the seat back can be rotated with the hand released from the operation lever. The structure can be simplified, which is effective in reducing the manufacturing cost of the recliner.

[0014]

FIG. 1 is an explanatory side view showing one embodiment of a reclining seat to which a recliner of the present invention is applied. As shown in this figure, a seat S for an automobile includes a seat bottom S1 as a seat, and a seat back S2 as a backrest erected on a rear end (right side in FIG. 1) of the seat bottom S1. It consists of Between the rear end of the seat bottom S1 and the lower end of the seat back S2, a pair of recliners 1 in a width direction (a direction orthogonal to the paper surface of FIG. 1) is provided, and by operating the recliner 1, The posture of the seat back S2 can be changed to a desired tilting posture between a forward falling posture that falls forward and a backward falling posture that falls backward. Incidentally, the seat back S2 in FIG. 1 is set to a standing posture which is intermediate between the forward leaning posture and the backward leaning posture.

FIG. 2 is an exploded perspective view, partially cut away, showing an embodiment of the recliner 1, and FIG. 3 is an assembled perspective view thereof. FIG. 4 is a P-line view of FIG. 3, and FIG.
FIG. 5 is a partially cutaway view of FIG. 4. FIG. 6 is a sectional view taken along line QQ of FIG. In FIGS. 2 and 3, XX
The direction is referred to as the width direction, and the YY direction is referred to as the front-rear direction.
The direction is referred to as left, the + X direction as right, the −Y direction as front, and the + Y direction as rear. 2 and 3 show the recliner 1 installed at the right position of the seat S.

As shown in these figures, the recliner 1
Is the first bracket 2 fixed to the seat bottom S1
A second bracket 3 fixed to the seat back S2 so as to face the first bracket 2; a pair of lock gears 4 interposed between the brackets 2 and 3;
There is a basic configuration including a cam 5 for rotating the pair of lock gears 4 in a direction of rotating and reciprocally rotating the pair of lock gears 4, and an operation lever 7 for rotating the cam shaft 6 forward and reverse around the axis. are doing.

The first bracket 2 is formed of a metal plate having an upper part having a semicircular shape and a lower part having a rectangular shape. The camshaft 6 is inserted through a semicircular center of curvature. The first bracket 2 has a pair of guide members 22 swelling rightward on the right surface of the first bracket 2. Each guide member 22 is formed in an arc shape with the insertion hole 21 as a center, and has a point-symmetric shape with respect to the insertion hole 21.

On the opposing surface of each guide member 22,
A guide recess 23 extending in the vertical direction is provided, and the guide recess 23 of the front guide member 22 is provided.
A long protrusion 22a having a large vertical dimension is provided below the guide concave portion 23 of the upper and rear guide members 22, and a short protrusion having a small vertical dimension is provided below the front guide concave portion 23 and the upper portion of the rear guide concave portion 23. 22b are respectively formed.

A lock gear 4 is provided between the front and rear guide recesses 23.
And a housing space 24 for housing the cam 5. The opposing surfaces of the long protrusion 22a and the short protrusion 22b that face each other are formed parallel to each other, and a part of each lock gear 4 (a claw tooth portion 41 described later) is slid between the opposing surfaces. A pair of upper and lower fitting grooves 2 fitted by
5 are formed. These fitting grooves 25 are provided in the insertion holes 21.
, And the groove width dimension is set to be the same.

On the right side surface of each guide member 22, there is provided an arcuate rotation guide convex portion 22c concentric with the outer peripheral surface of the guide member 22.
Are slidably fitted into a rotation guide groove 31a of the second bracket 3 described later.

The second bracket 3 is formed of a plate-like body having a semicircular lower part and a rectangular upper part. On the right side surface of the second bracket 3, a circular bulging portion 31 centering on the center of curvature of the semicircular portion is bulged, and the circular bulging portion 3 is formed.
A through hole 32 having the same diameter as the insertion hole 21 facing the insertion hole 21 of the first bracket 2 is formed in a center portion of the first bracket 2.

By setting the diameter of the insertion hole 21 and the through hole 32 to be larger than the diameter of the cam shaft 6, the cam shaft 6 is loosely fitted into the insertion hole 21 and the through hole 32. Even if the center and the center of relative rotation between the first and second brackets are misaligned due to, for example, a dimensional error, the cam shaft 6 can be rotated, and the cam shaft with respect to the pair of lock gears 4 can be rotated. The rotation operation of the lock gear 6 is always performed reliably, and the occurrence of a so-called one-sided effect state in which only one of the pair of lock gears 4 meshes with the internal ratchet 34 can be effectively prevented.

The left side of the circular bulging portion 31 has a second
A mounting recess 33 is provided in a state where the plate-like portion of the bracket 3 is hollowed out in a circular shape. The inner diameter of the mounting recess 33 is set slightly larger than the radius of curvature of the pair of guide members 22. Thus, in a state where the first bracket 2 and the second bracket 3 are combined, each guide member 22 is mounted in the mounting recess 33 while their arc outer peripheral surfaces are in sliding contact with the inner peripheral surface of the mounting recess 33. It has become.

On the inner peripheral surface of the mounting recess 33, there is provided an internal tooth ratchet 34 comprising internal teeth formed by cutting in the radial direction.
When the guide member 22 is mounted in the mounting recess 33, the bracket 3 is relatively rotated around the center of the insertion hole 21 in a state in which the arc outer peripheral surface of the guide recess 23 is in sliding contact with the tops of the teeth of the internal teeth ratchet 34. It can move.

An arcuate rotation guide groove 31a corresponding to the rotation guide protrusion 22c is provided on the left side surface of the circular bulging portion 31, and the rotation guide protrusion 22c is fitted into the rotation guide groove 31a. The first bracket 2
The relative rotation between the second bracket 3 and the second bracket 3 is performed more stably.

On the inner peripheral surface of the mounting concave portion 33, an internal tooth ratchet 34 made of radially cut internal teeth is provided over the entire peripheral length, and the first bracket 2 and the second The bracket 3 is a rotation guide convex shape 22.
c is inserted into the rotation guide groove 31a and the insertion hole 2 is
1 can be relatively rotated around the center. Since the internal ratchet 34 is formed on the inner peripheral surface of the mounting recess 33 having a larger diameter than the rotation guide groove 31a, the lock pitch (between one tooth of the internal ratchet and the adjacent tooth) is increased. Of the first bracket 2 and the second bracket 2 at a smaller pitch.
The relative rotation with respect to the bracket 3 can be locked, and as a result, the lock position can be more precisely positioned.

At the upper edge of the second bracket 3, mounting holes 35 are formed at the front and rear ends, respectively, and the second bracket 3 is bolted through these mounting holes 35 so that the second bracket 3 is attached to the seat back S2. Is to be fixed. The second bracket 3 has front and rear mounting holes 3.
It has a pair of locking holes 36 in the front-rear direction drilled between the five. These locking holes 36 are for screwing the upper holding plate 38 through the spacer 37, and holes corresponding to the locking holes 36 are formed in the spacer 37 and the upper holding plate 38, respectively. I have.

After the spacer 37 and the upper holding plate 38 are laminated on the upper left surface of the second bracket 3, the bolts B passed through the locking holes 36 are inserted into the stacked brackets 37, and then the nuts N are used to fasten the upper portions. The holding plate 38 is fixed to the second bracket 3 via the spacer 37. The thickness of the spacer 37 is the first bracket 2
The dimension is set slightly larger than the thickness dimension.

At the lower edge of the first bracket 2, mounting holes 26 are formed at the front and rear ends, respectively. The first bracket 2 is bolted through these mounting holes 26 so that the first bracket 2 is seated. It is configured to be fixed to the bottom S1. The first bracket 2 is provided with a pair of locking holes 27 formed in the front-rear direction between the front and rear mounting holes 26. These locking holes 27 are for screwing the lower holding plate 28 having a zigzag shape in a sectional view.

The lower holding plate 28 has an arc-shaped pressing portion 28a having an upper edge portion formed so as to be in sliding contact with the peripheral surface of the circular bulging portion 31, and a lower edge portion of the arc-shaped pressing portion 28a. And a flat plate portion 28b extending downward through a step portion slightly larger than the thickness dimension of the second bracket 3. Holes corresponding to the locking holes 27 are formed in the flat plate portion 28b.

Therefore, the guide member 2 of the first bracket 2
The upper holding plate 38 is bolted to the second bracket 3 via the spacer 37 while the second holding member 2 is fitted in the mounting recess 33 of the second bracket 3, and the lower holding plate 28 is attached to the first bracket 3.
3 and 5, the upper edge of the first bracket 2 is clamped between the lower edge of the upper holding plate 38 and the second bracket 3, as shown in FIGS. The first bracket 2 and the second bracket 3 are connected to each other so as to be relatively rotatable while the lower edge of the second bracket 3 is held between the upper edge of the lower holding plate 28 and the first bracket 2. It has become so.

The lock gear 4 is, as shown in FIG.
A claw tooth portion 41 which is vertically slidably fitted in the fitting groove 25 between the long protrusion 22a and the short protrusion 22b of the pair of guide members 22 swelled on the first bracket 2; The insertion hole 2 of the first bracket 2 from the side edge of the tooth portion 41
1 and a foot portion 42 extending so as to be fitted into the guide concave portion 23 while bypassing the first concave portion 1. The claw teeth portion 41 has claw teeth 41a that mesh with the internal teeth ratchet 34 of the second bracket 3 formed at the leading edge, and the claw teeth 41a are engaged with the guide member 22 fitted in the mounting recess 33. The relative rotation between the first bracket 2 and the second bracket 3 is restricted by meshing with the internal ratchet 34.

The foot 42 is shaped so that its outer edge is in sliding contact with the inner edge of the guide recess 23, and its length is longer than the vertical dimension of the guide recess 23 by a distance d.
The length of the guide recess 23 can be set as short as possible, so that the guide recess 23 can move up and down by a distance d (FIG. 4).
The distance d is set to be slightly larger than the depth dimension of the teeth of the claw teeth 41a, and the claw teeth 41a move radially outward from the insertion holes 21 so that the claw teeth 41a While engaging, the lock gear 4 moves in the direction of the insertion hole 21 so that the engagement of the claw teeth 41a with the internal ratchet 34 is released.

The lock gear 4 has an engaging portion 43 protruding toward the center line extending in the vertical direction of the first bracket 2 on the distal end side of the foot portion 42, and also has the above-mentioned claw tooth portion 41. The edge opposite to the foot 42 is the first bracket 2
Has a triangular projection 44 projecting toward a center line extending in the lateral direction. A curved concave portion 45 is formed from the tip of the protruding portion 44 to the engaging portion 43 for accommodating a part of the cam 5 (a fan-shaped projection 52 described later).

The vertically extending edges of the engaging portion 43 and the projecting portion 44 are flush with the opposing edge surfaces of the long projection 22a and the short projection 22b, respectively, and centered on the insertion hole 21. A pair of lock gears 4 in a point-symmetric state
Are fitted into the front and rear guide recesses 23, so that the engaging portions 43 of the front and rear lock gears 4 and the protruding portions 44 come into contact with each other, whereby each lock gear 4 is attached to the accommodation space 24 (FIG. 2). Has become stable.

The cam 5 has a cam body 51 having a predetermined diameter.
And a pair of fan-shaped fan-shaped protrusions 52 protruding outward from edges of the cam body 51 facing each other. An oval hole 53 into which the camshaft 6 is rotatably fitted around the axis is formed in the center of the cam body 51. The center angle of the fan-shaped projection 52 is set to approximately 90 °, while the curved concave portion 45 is formed such that the cam 5 is co-rotated around the cam shaft 6 while both end corners of the fan-shaped projection 52 are in sliding contact with the inner wall surface. The shape is set so that it can rotate.

On the other hand, the curved concave portion 45 has an inclined portion 45 a (FIG. 4) formed obliquely from the tip of the projecting portion 44 toward the claw teeth 41 a, and the inclined portion 45 a and the engaging portion 43. And a curved portion 45b formed therebetween. By rotating the cam 5 clockwise around the cam shaft 6, one corner 52a of the fan-shaped projection 52 is formed.
Presses the engagement portion 43 of each lock gear 4 to move the claw teeth 41 in a direction in which the claw teeth 41 approach each other.
Of the internal tooth ratchet 34 is released,
By rotating the cam 5 counterclockwise around the cam shaft 6, the other corner 52b of the fan-shaped projection 52 presses the inclined portion 45a of each lock gear 4 and the claw teeth 41 move in the direction away from each other. As a result, the inclined portion 45a and the curved portion 4 are formed so that the claw teeth 41a mesh with the internal tooth ratchet 34.
5b is set.

The cam shaft 6 is provided with an oval hole 53 of the cam 5.
Shaft main body 61 having an oval cross section that is fitted in sliding contact with the shaft body 61
And a shaft head 62 formed at the right end position of the shaft body 61.
And a retaining screw 64 screwed into a screw hole 63 screwed from the left end face along the axis of the shaft main body 61. The outer diameter of the shaft main body 61 is set so that the shaft main body 61 can be slidably fitted into the insertion holes 21 and the through holes 32 of the first and second brackets 2 and 3.

The oval hole 53 of the cam 5 is externally fitted to the shaft main body 61 in a state where the shaft main body 61 is fitted into the through hole 32 of the second bracket 3 via an oval hole of a link arm to be described later. 5 is mounted on the camshaft 6 so as to be rotatable about the axis. In this state, the insertion hole 21 of the first bracket 2 on which the lock gear 4 is mounted is externally fitted to the shaft main body 61, and the retaining screw 64 is screwed into the screw hole 63 to be fastened, so that the cam 5 becomes the first bracket. The second housing space 24 is mounted so as to be rotatable with the camshaft 6.

The operating lever 7 includes a lever body 71 extending in the front-rear direction, an inverted triangular mounting portion 72 formed on the base end side (rear end side) of the lever main body 71, Link arm 73 for linking with camshaft 6
It consists of The mounting portion 72 has a rotation center hole 72a serving as a rotation center at a lower end position, and a mounting hole corresponding to the rotation center hole 72a is provided at a position substantially below the center of the first bracket 2 in the front-rear direction. In the state where the mounting portion 72 is stacked on the lower right surface of the first bracket 2, the rotation center shaft 74 is inserted into the rotation center hole 72 a and the mounting hole 29 and fastened with a nut, thereby operating the operating lever. 7 is attached to the first bracket 2 so as to be rotatable about a rotation center axis 74.

The link arm 73 comprises a straight arm body 73a and a cylindrical spacer 73b protruding leftward from the upper end of the arm body 73a. The shaft main body 61 of the camshaft 6 is attached to the cylindrical spacer 73b.
Is inserted into the oval hole 73c, and the shaft main body 61 is inserted into the oval hole 73c to form the through hole 32 of the second bracket 3, the arc hole 53 of the cam 5, and the first hole 73c.
The camshaft 6 inserted into the insertion hole 21 of the bracket 2 rotates together with the link arm 73 by rotating the link arm 73 around the axis.

A link hole 73d is formed in the lower end of the arm body 73a, while a long hole extending downward (inclined downward toward the front) extends forward in the upper part of the upper part of the mounting part 72. 72b is drilled. This long hole 72
b and a link shaft (support shaft) 75 in the link hole 73d.
To connect the two, so that the operation lever 7
The link arm 73 is rotated clockwise about the cam shaft 6 by a clockwise rotation operation about the rotation center axis 74 of the rotation arm, and the link arm 73 is also rotated in the reverse direction (counterclockwise direction) by the reverse operation of the operation lever 7. ).

On the rear upper edge of the mounting portion 72, a locking projection 76 having a width substantially equal to the length of the cylindrical spacer 73b is provided so as to project leftward. The circular bulging portion 31 of the second bracket 3 has an arc-shaped stopper (arc projection) 3 concentric with the center of the through hole 32 in the lower front portion on the right side.
9 are protruded. Then, this arc-shaped stopper 39
The locking projection 76 does not interfere with each other when the seat back S2 is set in the backward posture, but when the operation lever 7 is operated to the unlock position and the seat back S2 is moved forward. When the seat back S2 interferes with each other and the seat back S2 is set to the forward posture, the mutual positional relationship and the mutual dimensions are set so that the unlocked position of the operation lever 7 is maintained.

The first bracket 2 and the lever body 71
A coil spring 77 is interposed between the control lever 7 and the operating lever 7.
Always receives a force in the counterclockwise direction around the rotation center axis 74 by the urging force of the coil spring 77, so that the claw teeth 41a are normally set at the lock position where they mesh with the internal teeth ratchet 34. ing.

FIGS. 7 and 8 are explanatory diagrams for explaining the operation of the present invention. FIG. 7 shows a related operation between the cam 5 and the lock gear 4 inside the recliner 1, and FIG. 8 shows a relationship between the operation of the operation lever 7 outside the recliner 1 and the tilted state of the second bracket 3. It is shown. 7 and FIG.
(A) is a state in which the rotation of the seat back S2 is locked,
(B) shows a state in which the rotation lock of the seat back S2 is released.

First, in the state shown in FIG. 7A and FIG. 8A, the second bracket 3 is set in the upright posture, and the locking projection 76 of the operation lever 7 is in contact with the arc-shaped stopper 39 of the second bracket 3. There is no interference ((a) in FIG. 8). Accordingly, the operating lever 7 receives an urging force in the counterclockwise direction around the camshaft 6 by the urging force of the coil spring 77, and the fan-shaped projections 52 rotate the cam gear 6 around the camshaft 6, thereby causing each lock gear 4 to rotate. The corresponding inclined portions 45a are respectively pressed in the separating direction (FIG. 7 (A)),
This pressing causes the claw teeth 41 of the claw tooth portion 41 of the lock gear 4 to move.
a is engaged with the internal ratchet 34 of the second bracket 3. The rotation of the second bracket 3 around the camshaft 6 is restricted (locked) by the engagement of the claw teeth 41a with the internal teeth ratchet 34, and the set posture of the seat back S2 (FIG. 1) is maintained. It is in a state of being left.

Next, the occupant of the seat S operates the operating lever 7.
When the user grips and operates upward, the operation lever 7
The rotation about the rotation center axis 74 of the
b through the link shaft 75 inserted into the link arm 73
And the link arm 73 rotates clockwise around the camshaft 6, whereby the camshaft 6 rotates clockwise ((b) in FIG. 8). The cam shaft 6 of the cam 5 by this rotation
The pressing of the one end of each fan-shaped projection 52 against each lock gear inclined portion 45a is released by the co-rotation, and the pressing of the other end of the fan-shaped projection 52 against the engaging portion 43 causes each of the lock gears 4 to become a cam. Movement in the direction of the shaft 6 causes the engagement of the pawl teeth 41a with the internal ratchet 34 to be released, as shown in FIG. By this release, the second bracket 3 can arbitrarily rotate forward and reverse around the cam shaft 6 as shown by a two-dot chain line in FIG. Can be set to

Then, after the seat back S2 is set to the desired backward posture, when the gripped operating lever 7 is released, the operating lever 7 is rotated counterclockwise around the cam shaft 6 by the urging force of the coil spring 77. The tooth 41a meshes with the internal tooth ratchet 34 in co-rotation with the cam shaft 6, and the recliner 1
Returns to the state of maintaining the tilting posture of the seat back S2 shown in FIG.

In the present invention, the operation lever 7
When the seat back S2 is tilted forward and the second bracket 3 is tilted forward after grasping and pulling upward and setting the position to the unlocked position, as shown in FIG. The stop projection 76 interferes with the arc-shaped stopper 39 of the second bracket 3, whereby the operation lever 7 located at the unlocked position is prevented from rotating counterclockwise around the rotation center axis 74. It has become. Accordingly, in this state, even if the hand holding the lever body 71 is released, the operation lever 7 does not rotate around the rotation center axis 74 against the urging force of the coil spring 77, so that the claw teeth 41a The state in which the engagement with the internal teeth ratchet 34 is released ((b) in FIG. 7) is maintained, whereby the seat back S2 is moved to the seat bottom S without continuing to operate the operation lever 7.
It is possible to continue the forward operation until it is folded up.

As described in detail above, the recliner 1 of the present invention comprises the first bracket 2 fixed to the seat bottom S1.
And a second bracket 3 fixed to the seat back S2 and rotatably connected to the first bracket 2 around the cam shaft 6. The second bracket 3 is formed with a ratchet 34 having internal teeth around the camshaft 6, and the first bracket 2 is fitted with an arc-shaped peripheral surface in a sliding contact with the internal ratchet 34, Further, a pair of arc-shaped guide members 22 which are set in a point-symmetrical manner with respect to the camshaft 6 and which are spaced apart from each other are provided. Between the guide members 22, a cam 5 attached to the cam shaft 6 so as to be able to rotate coaxially around the axis, and a shape set so that the cam 5 is moved in opposite directions by the turning operation of the cam 5, and A pair of lock gears 4 having claw teeth 41a that mesh with the internal ratchet 34 in a separated state are mounted. Further, an operation lever 7 for rotating the camshaft 6 is provided between a lock position where the pawl teeth 41a mesh with the internal ratchet 34 and a lock release position where the pawl teeth 41a mesh with the internal ratchet 34 is released. The operating lever 7 is biased by the biasing force of the coil spring 77 so as to be located at the lock position. The second bracket 3 is provided with an arc-shaped stopper 39 for holding the operation lever 7 at the unlocked position when the seat back S2 is in the inclined position within a predetermined range.

Therefore, since the pawl teeth 41a of the pair of lock gears 4 are normally meshed with the internal ratchet 34, the rotation of the seat back S2 around the cam shaft 6 is locked, and the set tilt is set to a predetermined value. The posture is maintained. By rotating the cam shaft 6 in a predetermined direction by operating the operation lever 7, the cam 5 integrated with the cam shaft 6 rotates in a predetermined direction. The guide gears move toward each other while being guided, thereby releasing the engagement of the pawl teeth 41a of the lock gears 4 with the internal tooth ratchet 34, so that the first bracket 2 and the second bracket 3 are relatively moved around the cam shaft 6. When the seat back S2 integrated with the second bracket 3 is turned, the seat back S2 can be turned to a desired tilting posture.

Then, by releasing the operating lever 7 held in a state where the desired tilting posture of the seat back S2 is selected, the operating lever 7 is shifted to the lock position by the urging force of the coil spring 77. The pair of lock gears 4 move in the direction away from each other while being guided by the guide member 22, and the pawl teeth 41a mesh with the internal tooth ratchet 34, so that the rotation of the second bracket 3 around the cam shaft 6 is locked, Seat back S2 integrated with 2 bracket 3
Is maintained.

When the seat back S2 is in an inclined position within a predetermined range, the arc-shaped stopper 39 for holding the phase of the operation lever 7 at the unlock position is provided. By providing the arc-shaped stopper 39 so as to function within the range of the posture, the unlocked state of the operation lever 7 can be maintained even if the hand is released from the operation lever 7 which is gripped when the seat back S2 is moved forward. Will be maintained. Therefore, when the seat is in the front seat, when operating the seat back S2 forward to get on and off the rear seat of the occupant, the operation lever 7 is operated to the unlock position against the urging force of the coil spring 77. It is not necessary to continue the operation, and the forward operation of the seat back S2 is made easier.

The operation lever 7 is connected to the first bracket 2.
The cam shaft 6 is rotatably supported around a link shaft 75 provided in parallel with the cam shaft 6, and the cam shaft 6 is interposed between the operation lever 7 and the cam shaft 6 in conjunction with the rotation operation of the operation lever 7. By providing the link arm 73 to be rotated, by operating the operation lever 7 to the unlocked position, the operation of the operation lever 7 is transmitted to the camshaft 6 via the link arm 73 and the inside of the claw teeth 41a is formed. The engagement with the tooth ratchet 34 is released, so that the seat back S2 can rotate around the cam shaft 6. Then, in this state, by tilting the seat back S2 toward a predetermined range and rotating the second bracket 3, the arc-shaped stopper 39 of the second bracket 3 and the operation lever 7 interfere with each other. As a result, the rotation of the operating lever 7 at the unlock position around the link shaft 75 is prevented, so that the operating lever 7 maintains the unlocked position even if the user releases his / her hand.

As described above, the operation lever 7 is pivotally supported on the first bracket 2 so as to be rotatable around the link shaft 75, and the rotation of the operation lever 7 is transmitted to the cam shaft 6 via the link arm 73. On the other hand, by providing the second bracket 3 with the arc-shaped stopper 39 for maintaining the unlocked position of the operation lever 7, the seat back S2 can be released from the operation lever 7 within a predetermined rotation range of the seat back S2.
It is possible to simplify the so-called lock release maintaining structure that can perform the turning operation of, and it is effective in reducing the manufacturing cost of the recliner.

FIG. 9 is an exploded perspective view, partially cut away, showing a second embodiment of the recliner. In the recliner 1 of the first embodiment, the guide ridge 22c provided on the guide member 22 of the first bracket 2 is fitted into the guide groove 31a of the second bracket 3, but instead of this, the second In the recliner 1a of the embodiment, a first peripheral surface 34a provided with the internal tooth ratchet 34 on the second bracket 3a and a second peripheral surface 34b on which the outer peripheral surface of the guide member 22 slides are provided concentrically. The diameter of the peripheral surface 34a and the diameter of the second peripheral surface 34b are set to be substantially the same, or the diameter of the first peripheral surface 34a is set to be slightly larger than the diameter of the second peripheral surface 34b. By doing so, the guide member 22 of the first bracket 2a and the circular bulging portion 31 of the second bracket 3a have the guide ridge 22c and the guide groove 31a as employed in the first embodiment.
And the first and second brackets 2
a, 3a can have a simpler structure.

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

(1) In the above embodiment, the rotation of the lever body 71 around the rotation center axis 74 and the rotation of the link arm 73 around the cam shaft 6 are in the same direction. However, the present invention is not limited to the same rotation direction of the lever main body 71 and the link arm 73, but the lever main body 7 is rotated in the opposite directions.
1 and the link arm 73 may be linked. However, in order to do this, it is necessary to reverse the arrangement of the guide member 22, the lock gear 4 and the cam 5 in the front and rear with respect to the arrangement of the above embodiment.

(2) The unlock position of the operation lever 7 is not limited to the range in which the seat back S2 is tilted forward.
A predetermined range of the reclining posture in which the rearward movement 2 is lowered may be adopted as the lock release position. By doing this,
The reclining posture of the seat back S2 can be switched stepwise between a plurality of predetermined steps.

(3) In the above embodiment, the arc-shaped stopper 39 is provided integrally with the second bracket 3.
If this is separately attached to the second bracket 3 by screwing or the like so as to be detachable, the unlocking range of the operation lever 7 can be easily changed.

[0061]

According to the seat reclining device of the first aspect of the present invention, the operating lever urged so as to be located at the lock position by the urging force of the urging means has a seat back within a predetermined range. Since the lock release position set by the lock release holding means is held when in the tilted position, for example, the lock release holding means is provided so that the seat back functions in a range where the seat back is in the forward tilt position. Thus, even when the user releases his / her hand from the gripped operation lever when the seatback is moved forward, the unlocked state of the operation lever can be maintained. Therefore, when the seat is in the front seat, when operating the seatback forward to get on and off the rear seat of the occupant, the operation lever is continuously operated to the unlock position against the urging force of the urging means. There is no necessity, and the forward operation of the seat back can be easily performed.

In the seat reclining device according to the second aspect of the present invention, the operation lever is rotatably supported around a support shaft provided on the first bracket in parallel with the cam shaft. A link arm for rotating the cam shaft in conjunction with the rotation of the operation lever is provided between the cam shaft and the cam shaft,
When the seat back is in a tilting position within a predetermined range, the second bracket projects an arc projection concentric with the cam shaft projecting so as to interfere with the operation lever and maintain the unlocked position of the operation lever. By operating the operation lever to the unlock position, the operation of the operation lever is transmitted to the camshaft via the link arm, and the engagement of the pawl teeth with the internal ratchet is released. It can be pivotable around.

In this state, by tilting the seat back toward a predetermined range and rotating the second bracket, the arc projection of the second bracket and the operation lever interfere with each other, thereby releasing the lock. Since the rotation of the operating lever in the position around the support shaft is prevented, the operating lever can maintain the unlocked position even when the hand is released therefrom.

As described above, the operation lever is pivotally supported by the first bracket so as to be rotatable around the support shaft, and the rotation of the operation lever is transmitted to the cam shaft via the link arm, while being transmitted to the second bracket. By providing an arc-shaped projection for maintaining the unlocked position of the operation lever, a so-called lock release maintenance can be performed in a predetermined rotation range of the seat back so that the seat back can be rotated with the hand released from the operation lever. The mechanism can have a simple structure, which is advantageous in reducing the manufacturing cost of the recliner.

[Brief description of the drawings]

FIG. 1 is an explanatory side view showing an embodiment of a reclining seat to which a recliner of the present invention is applied.

FIG. 2 is a partially cutaway exploded perspective view showing an embodiment of a recliner.

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

FIG. 4 is a diagram viewed from a line P in FIG. 3;

FIG. 5 is a partial sectional view of FIG. 4;

FIG. 6 is a sectional view taken along line QQ of FIG. 3;

FIGS. 7A and 7B are explanatory views for explaining the operation of the present invention, and show the related operation between the cam and the lock gear inside the recliner. FIGS.

FIGS. 8 (a) and (b) are explanatory views for explaining the operation of the present invention, and show a second structure outside the recliner; FIGS.
It shows the relationship between the tilted state of the bracket and the operable range of the operation lever.

FIG. 9 is an exploded perspective view showing a recliner according to a second embodiment of the present invention;

[Explanation of symbols]

 S seat S1 seat bottom S2 seat back 1 recliner 2 first bracket 22 guide member 22c convex rotation guide 3 second bracket 31a rotation guide groove 34 internal ratchet 39 arc-shaped stopper (arc projection) 4 lock gear 41a claw tooth 5 cam 6 Camshaft 7 Operating lever 77 Coil spring

Claims (2)

[Claims] 1. A seat which is disposed at a connection portion between a seat bottom and a seat back connected to the seat bottom so as to be tilted within a predetermined range, and which is arbitrarily set within the above range by operating an operation lever. An urging structure of an operation lever in a reclining seat configured to lock and unlock a tilting posture of a back, comprising: a first bracket fixed to a seat bottom; and a second bracket fixed to a seat back. The first bracket and the second bracket are coupled to each other so as to be relatively rotatable by fitting a concave portion provided on one of the first brackets and a convex portion provided on the other. An internal tooth ratchet is formed on the inner peripheral surface of the concave portion, and the convex portion is formed by a pair of half-split convex portions having parallel sliding surfaces facing each other. A pair of lock gears which are slidably fitted between the sliding surfaces of the half-split protrusions in a sliding contact state, and have claw teeth meshing with the internal tooth ratchets on tip surfaces opposite to each other. A cam that rotates about a cam axis to move the pair of lock gears in opposite directions to each other, wherein the first and second brackets each have a center formed in a center portion of the relative rotation. A hole in which the camshaft is inserted into the center hole; a lock position where the pawl teeth mesh with the internal ratchet; and a lock release position where the pawl teeth are disengaged from the internal ratchet. An operating lever for rotating the cam shaft is provided between the seat back and the operating lever. The operating lever is biased by an urging force of an urging means so as to be located at a lock position, and the seat back is tilted within a predetermined range. In And a lock release holding means for holding the operation lever at the lock release position when the seat is in the unlocked position. 2. The operation lever according to claim 1, wherein the operation lever is rotatably supported around a support shaft provided in parallel with the cam shaft on the first bracket, and an operation lever is provided between the operation lever and the cam shaft. A link arm for rotating the cam shaft in conjunction with the rotation operation is interposed, and the second bracket interferes with the operation lever when the seat back is in a tilted position within a predetermined range. 2. The reclining device for a seat according to claim 1, wherein an arc-shaped projection is provided so as to be concentric with the camshaft and protruded so as to maintain the unlocked position.