JP2001211949A - Recliner structure for seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To arbitrarily set the lock range of the reclining positions of a seat back. SOLUTION: A memory plate 9 for blocking the engagement of a lock plate 4 to inner teeth 34 by masking the inner teeth 34 is interposed between a first bracket 2 fixed on a seat bottom and a second bracket 3 fixed on the seat back, and this memory plate 9 is composed of an annular plate body 91 having an inner diameter a little larger than the diameter dimension of a circular projecting part, a pair of mask pieces 92 extended from the counter peripheral surface of this plate body 91 so as to mask the inner teeth 34 of the circular projecting part within a prescribed range, and an operating lever 93 for the turning operation of the plate body 91 projected outward from the plate body 91.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a seat recliner structure.

[0002]

2. Description of the Related Art Conventionally, a seat recliner structure interposed between a seat bottom and a seat back has been known. The recliner structure includes a first bracket fixed to one of a seat bottom and a seat back tiltably attached to the seat bottom, and a first bracket fixed to the other, and relatively to the first bracket about a rotation center. The second bracket is rotatably connected to the second bracket.

[0003] Such a recliner structure has a first structure.
Interposed between the bracket and the second bracket, and
A cam is provided so as to be rotatable about a support shaft concentric with the rotation center. This cam moves the lock plate provided with locking teeth on the distal end face in the radial direction between the first and second brackets in the forward and reverse directions by forward and reverse rotation of the support shaft. The first bracket is provided with a radially extending guide groove formed between the opposing walls parallel to each other. The lock plate moves forward and backward in the guide groove by the rotation of the cam. The pawl protrudes from the guide groove.

On the other hand, internal teeth are formed on the second bracket along a circular locus concentric with the rotation center. As a result, the rotation of the cam causes the lock plate to protrude outward from the guide groove, and the locking teeth mesh with the internal teeth, thereby restricting the relative rotation between the first bracket and the second bracket. The engagement of the locking teeth with the internal teeth is released by the reverse rotation of the first bracket, so that the first bracket and the second bracket can relatively rotate.

Therefore, an operating rod is attached to the support shaft,
By rotating the support shaft forward and backward by operating this operation rod,
The tilting position of the seat back can be locked by engaging the locking teeth with the internal teeth, and the tilting position can be changed by releasing the engagement.

[0006]

By the way, in the conventional recliner structure as described above, the internal teeth formed on the second bracket correspond to these positions corresponding to the upright position and the backward position of the seat back. The seat provided with such a recliner structure is provided only partially between the upright position and the backward position, so that the seatback can only be set at an arbitrary angle between the upright position and the backward position. Is the front seat of the vehicle, and when the passenger in the rear seat gets on and off, after tilting the seat back to the foremost bent position and returning it to the original position, the tilted position is locked once at the initial lock position (first stage lock position) Will be done. Therefore, the occupant in the front seat has to release this lock and readjust the seat back to a desired tilting posture, which is very troublesome.

Further, even if the range of the tiltable position where the seat back can be locked is changed, the range of forming the internal teeth cannot be changed with the conventional recliner structure.
There is also a problem that the seatback cannot be locked at a position beyond this range, and the range of the position setting of the seatback is narrow.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and provides a seat recliner structure in which a locking range of a tilting position of a seat back can be arbitrarily set. It is intended to be.

[0009]

According to the first aspect of the present invention,
A first bracket fixed to one of the seat bottom and the seat back; a second bracket fixed to the other and connected to the first bracket so as to be relatively rotatable around a rotation center; A cam interposed between the brackets and rotated around the rotation center by operation of the operation rod, and a lock plate radially protruding and retracting between the first and second brackets in association with the forward and reverse rotation of the cam. The first bracket is fitted with a lock plate, and the peripheral surface has a circular convex portion along a circular locus around the rotation center, and the lock plate is recessed in the circular convex portion. A guide groove is provided for guiding, while the second bracket has a circular recess in which the circular protrusion is fitted in sliding contact with the second bracket, and the circular shape meshes with a locking tooth at the tip of a lock plate protruding from the guide groove. Recessed An inner tooth formed on a peripheral surface of the seat; and a biasing means for biasing a cam around a support shaft so that the lock plate projects from the guide groove. A memory plate is interposed between the first and second brackets to mask the internal teeth and prevent the lock plate from meshing with the internal teeth. The memory plate has an annular plate body and an opposing plate body. Extending from the surrounding surface,
Also, a pair of mask pieces provided between the internal teeth of the circular concave portion and the circular convex portions and provided so as to mask the internal teeth in a predetermined range, and protruded outward from the plate body. ,
And an operation lever for rotating the plate body.

According to the present invention, the mask position of the internal teeth by the mask piece provided on the plate body is changed by rotating the memory plate. And
By changing the mask position of the internal teeth by the mask piece, the meshing position of the lock plate with the internal teeth is changed, thereby changing the lockable position of the tilting posture of the seat back. That is, the memory plate is in a state where the so-called lock-free position of the seat back is stored.

Accordingly, the lock free position of the seat back can be arbitrarily changed by rotating the plate body (ie, the lockable position of the seat back can be arbitrarily set). The selection range of the tilting position of the seat back is expanded, so that a more suitable tilting position of the seat back can be immediately reproduced according to the situation.

[0012] Further, since the initial position of the lock of the seat back generally differs depending on the vehicle type, in the conventional recliner structure, a plurality of types of second brackets having different positions for forming the internal teeth according to the vehicle type are provided. However, in the present invention, by forming the internal teeth on the entire inner peripheral surface of the second bracket, it is possible to cope with various types of vehicles only by shifting the position of the mask piece of the memory plate. Thus, the common use of parts is realized.

According to a second aspect of the present invention, in the first aspect of the present invention, the plate main body is provided with an operation lever for rotating the plate main body protruding outward. It is characterized by the following.

According to the present invention, the plate main body can be rotated by operating the operation lever protruding outward, and the position setting operation of the mask piece is facilitated.

The third aspect of the present invention provides the first or second aspect.
In the invention described in the above, the mask piece has a positioning projection which is removably engaged with the internal teeth by elastic deformation.

According to the present invention, when the memory plate is rotated by operating the operation lever, the positioning projections are disengaged from the inner teeth of the second bracket, so that a sense of moderation can be obtained by responding to this operation. The amount of rotation of the memory plate is felt.

Further, since the rotation position of the memory plate once set is maintained at a position where the positioning projection meshes with the inner teeth, the seat back is tilted unless the operation lever is operated by applying force. The inconvenience of changing the set position of the memory plate due to the rotation of the second bracket is avoided, and the once set lock-free range is reliably maintained.

[0018]

FIG. 1 is an explanatory side view showing an embodiment of a reclining sheet to which a recliner structure according to the present invention is applied. As shown in this figure, a seat S for an automobile has a seat bottom S1 and a seat back S2.
The seat bottom S1 and the seat back S2 are connected by a pair of recliners 1 so as to be tiltable back and forth.

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. As shown in these figures, the recliner 1 includes a first bracket 2 fixed to a seat bottom S1 (FIG. 1).
A second bracket 3 fixed to the seat back S2 so as to face the first bracket 2; a pair of lock plates 4 interposed between the brackets 2 and 3; Rotate the pair of lock plates 4
A cam 5 for moving the cam shaft 6 in a direction to move the cam shaft 6 in and out of contact; an operating rod 7 for rotating the cam shaft 6 forward and backward around the axis;
And a memory plate 9 interposed between the first bracket 2 and the second bracket 3.

The first bracket 2 has an upper portion formed in a semicircular shape and a lower portion expanding downward, and an insertion hole 21 through which the cam shaft 6 is inserted is formed in a semicircular center of curvature. On the left surface, a pair of guide members 22 in the front-rear direction is bulged inwardly in the width direction (to the left in FIG. 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. These pair of guide members 22
Thereby, a circular convex portion according to the present invention is formed.

FIG. 4 is a perspective view taken along the line X and the line Y of FIG. 2. A guide recess 23 extending in the vertical direction is provided on the opposing surface of each of the guide members 22. Due to the recess of the guide recess 23, guide protrusions 22 a projecting in directions facing each other are formed on the upper and lower portions of each guide member 22.

An accommodation space 24 for accommodating the lock plate 4 and the cam 5 is formed between the opposing guide recesses 23 and a part of each lock plate 4 (described later) between the opposing surfaces of the guide projections 22a. A pair of upper and lower guide grooves 25 into which the locking tooth plate 41) is fitted in a sliding contact state are formed.

On the surface of each guide member 22, an arc-shaped guide ridge 22b concentric with the outer peripheral surface of the guide member 22 is provided.
Are provided, and these guide ridges 22b are
The bracket 3 is fitted into the circular guide groove 31a of the bracket 3 in a sliding contact state.

The second bracket 3 is shown in FIGS.
As shown in the figure, the lower part is formed in a circular shape and the upper part is formed in a substantially rectangular shape. On the left side surface of the second bracket 3, a circular bulging portion 31 is bulged from the back side (right surface) of the circular portion with the center of curvature as the center, and the circular bulging portion 31 is formed. A through hole 32 facing the insertion hole 21 of the first bracket 2 is formed in the center portion.

A mounting recess (circular recess) 33 is provided on the right side of the circular bulging portion 31 in FIG. The inner diameter of the mounting recess 33 is determined by the pair of guide members 2.
2 is set slightly larger than the radius of curvature, and by combining the first bracket 2 and the second bracket 3, a slight gap is formed between the outer peripheral surface of the arc of each guide member 22 and the inner peripheral surface of the mounting recess 33. The brackets 2 and 3 are connected so as to be relatively rotatable around the cam shaft 6 (FIG. 2) in a state where a gap is formed.

On the right side of the mounting recess 33, a circular guide groove 31a concentric with the through hole 32 corresponding to the guide ridge 22b is recessed, and the guide ridge 22b is fitted into the circular guide groove 31a. This allows the relative rotation between the first bracket 2 and the second bracket 3 to be performed more stably. On the inner peripheral surface of the mounting recess 33, internal teeth 34 formed by cutting in the radial direction are provided over the entire circumference.

At the upper edge of the second bracket 3, mounting holes are formed at the front and rear ends, respectively, and the second bracket 3 is fixed to the seat back S2 by being bolted through these mounting holes. It is supposed to be.
In addition, the second bracket 3 has positioning projections projecting toward the first bracket 2 between the front and rear mounting holes. These positioning projections are for positioning the mounting position of the holding plate 35 (FIG. 2) for holding the first bracket 2 so as not to come off from the second bracket 3.

Then, the holding plate 35 is fixed to the second bracket 3 in a state where the first bracket 2 is stacked on the second bracket 3, so that the holding plate 35 allows the first bracket 2 to rotate while allowing the first bracket 2 to rotate. , So that the upper part of the first bracket 2 is
To prevent them from moving away from

Also, mounting holes are formed in the lower edge of the first bracket 2 at the front and rear ends, respectively, and the first bracket 2 is bolted through these mounting holes so that the first bracket 2 is attached to the seat bottom S1. It is fixed.

FIGS. 5A and 5B are front views showing one embodiment of the lock plate 4. FIG. 5A shows a state in which locking teeth 41a of the lock plate 4 project outside from the guide groove 25, and FIG. The state where the teeth 41a are immersed in the guide grooves 25 is shown. As shown in FIG. 5, the lock plate 4
The locking tooth plate 41 is fitted into the guide groove 25 of the first bracket 2 so as to be movable up and down, and a hook-shaped plate 42 integrally connected to the base end side of the locking tooth plate 41.

The locking tooth plate 41 has locking teeth 41a that mesh with the internal teeth 34 (FIGS. 2 and 4) of the second bracket 3 formed at the leading edge, and the guide member 22 is mounted. When the locking teeth 41a are fitted in the recesses 33, the internal teeth 3
The relative rotation between the first bracket 2 and the second bracket 3 is restricted by meshing with the bracket 4.

The hook-shaped plate 42 is shaped and shaped so that the outer side edge is in sliding contact with the inner edge of the guide recess 23 and the inner edge is in sliding contact with the outer peripheral surface of the cam 5. A horizontal plate 43 extending in the horizontal direction is integrally connected to the base end of the tooth plate 41, and a vertical plate 44 extending in the opposite direction to the locking tooth plate 41 from the clockwise end of the horizontal plate 43. ing. The length of the vertical plate 44 is set shorter than the vertical dimension of the guide recess 23 by a distance d, so that the vertical plate 44 can move up and down by the distance d in the guide recess 23.

The distance d is set slightly larger than the length of the locking teeth 41a.
1 (FIG. 2) moves outward in the radial direction so that the locking teeth 41a of the locking tooth plate 41 mesh with the internal teeth 34 (FIGS. 2 and 4), while the hook-shaped plate 42 is inserted. By moving toward the direction of the hole 21, the locking teeth 41 a
Is disengaged from the internal teeth 34.

The horizontal plate 43 and the vertical plate 44 are connected to each other at a substantially right angle, and the curved concave portion 4 for accommodating the cam 5 is provided in each inner portion of the horizontal plate 43 and the vertical plate 44.
5 are formed. At both ends of the horizontal plate 43, contact protrusions 43a are provided which come into contact with the guide protrusions 22a of the guide member 22, and these contact protrusions 43a come into contact with the guide protrusions 22a so that the locking tooth plate is provided. 41
Is prevented from tilting in the direction in which the load is applied, whereby the locking teeth 41a are always reliably engaged with the internal teeth 34.

An engagement projection 44a projecting toward the cam 5 is provided at a substantially central position of the vertical plate 44.
The interlocking projection 44a interferes with the rotating cam 5, whereby the locking tooth plate 41 is immersed in the guide groove 25.

The pair of lock plates 4 are mounted at point-symmetric positions of the accommodation space 24 around the center of the insertion hole 21, and the tip of one vertical plate 44 is connected to the other horizontal plate. The shape is set so as to be in contact with the side end surface of the plate 43, so that the mounting state of each lock plate 4 to the accommodation space 24 is stabilized.

The cam 5 comprises a cam body 51 having a substantially elliptical shape, and a pair of pressing projections 52 projecting outward from an edge of the cam body 51 at a point symmetrical position. . A hexagonal hole 53 through which the camshaft 6 is inserted is formed in the center of the cam body 51. On the other hand, the camshaft 6
As shown in FIG. 3, the vehicle is bridged between the left and right recliners 1 (only one recliner 1 is shown in FIG. 3) across the seat bottom S <b> 1, and the operation of the operation rod 7 extends to both recliners 1. I have to. Specifically, the camshaft 6
The dimensions are set so that the hexagonal hole 53 is slidably fitted in the hexagonal hole 53,
By rotating the cam 5 of one recliner 1 by operating the operation rod 7, the rotation of this cam 5 is transmitted to the cam 5 of the other recliner 1 via the cam shaft 6, and the other cam 5 is rotated. It is configured to rotate synchronously with one cam 5 around the axis.

As shown in FIG. 5, the pair of pressing projections 52 are provided corresponding to the engaging projections 44a projecting from the vertical plate 44 of each lock plate 4, respectively, as shown in FIG. When the cam 5 in the state shown rotates clockwise around the cam shaft 6, the pressing projection 52 presses the engaging projection 44a, and as a result, as shown in FIG. The pawl 41a is located at an unlock position where it is immersed in the guide groove 25.

As shown in FIG. 2, the operating rod 7 comprises an L-shaped plate 71 having an L-shape, and a handle 72 attached to the tip of the L-shaped plate 71. L-shaped plate 7
1 has an insertion hole 73 for inserting the cam shaft 6
And a pair of cut-and-raised pieces 74 is provided so as to penetrate the insertion hole 21 of the first bracket 2 with the insertion hole 73 interposed therebetween. A locking hole 54 into which the raising piece 74 is fitted is formed.
When the first bracket 2 is sandwiched between the cam 5 and the L-shaped plate 71, the operation rod 7 is operated by the handle 72 by operating the handle 72 by cutting and raising the locking hole 54 and fitting the piece 74. The cam 5 rotates together with the cam shaft 6 by rotating around the cam shaft 6.

The operating rod 7 has the cut-and-raised piece 74 penetrated through the insertion hole 21 of the first bracket 2 and the locking hole 5 of the cam 5.
4, the holding plate 8 is secured to the first bracket 2 with a rivet 76 (FIG. 3) to prevent the holding plate 8 from coming off, thereby stabilizing the mounting state of the operation rod 7 to the first bracket 2. It is made to let.

As shown in FIG. 2, the holding plate 8 is a plate body 81 for holding the L-shaped plate 71 of the operating rod 7.
And an arc plate 82 projecting outward from an upper edge portion of the plate body 81. Plate body 8
A spring-hung protrusion 83 protrudes from the rear end of the lower edge portion of the control rod 7, and the spring-hook protrusion 75 is also provided on the L-shaped plate 71 of the operating rod 7.
And a coil spring 8 is provided between the two projecting pieces 75 and 83.
The operation rod 7 is urged counterclockwise around the camshaft 6 by being stretched.

When the operating rod 7 is urged counterclockwise around the camshaft 6, the cam 5 also rotates counterclockwise around the camshaft 6 via the cut-and-raised piece 74 of the operating rod 7. The cam 5 presses the lock plate 4 outward in the radial direction because the urging force is applied so as to rotate in the direction of the arrow. The locking teeth 41a mesh with the internal teeth 34 of the second bracket 3 by projecting from the
Of the cam shaft 6 is restricted.

By operating the operating rod 7 upward in this state, the cam 5 rotates clockwise around the cam shaft 6 and is locked by the pressing projection 52 of the cam 5 pressing the engaging projection 44a. The teeth 41a enter the guide grooves 25 of the first bracket 2 and the engagement of the locking teeth 41a with the internal teeth 34 is released, whereby the tilting posture of the seat back S2 can be set arbitrarily.

The holding plate 35 is also provided with a spring hook 35a projecting rightward in FIG. 2, and the spring hook 35a and the front edge of the arc plate 82 of the holding plate 8. Is provided with a spiral spring 10. The spiral spring 10 causes the second bracket 3 to receive a biasing force in the counterclockwise direction around the camshaft 6 via the holding plate 35, and the seat back S2 is always in a forwardly inclined position via the second bracket 3. Is being biased.

Hereinafter, the memory plate 9 will be described with reference to FIG.
The description will be given with reference to other drawings as necessary. FIG. 6 is a perspective view showing one embodiment of the memory plate. The memory plate 9 is provided between the first bracket 2 and the second bracket 3 (FIG. 2) to form an unlock region R of the lock plate 4 (FIG. 7).

The memory plate 9 is formed by performing a pressing process on a thin spring material. The inner diameter of the second bracket 3 is set to be substantially the same as the inner diameter of the mounting recess 33 of the second bracket 3. An annular plate body 91 slightly larger than the diameter of the circular convex portion of the first bracket 2 formed by the pair of guide members 22; A pair of mask pieces 92 extending so as to cover and mask the internal teeth 34 (FIG. 2) of No. 3 in a predetermined range.
And an operation lever 93 protruding outward from the plate body for rotating the plate body.

The mask piece 92 is protruded inward from the inner peripheral surface of the plate body 91, and
3 (to the left in FIG. 6) is integrated with the plate body 91 via a connecting piece 94 bent. The mask pieces 92 are formed so as to project from opposite ends of the connection piece 94 in the circumferential direction along the circular locus about the axis of the cam shaft 6 in opposite directions. The mask piece 92 forms an unlocking region R for preventing the locking teeth 41 a of the lock plate 4 from meshing with the internal teeth 34.

At both ends of each mask piece 92, a positioning projection 92a is formed, which is protruded and raised outward in the radial direction. Each of these positioning projections 92a is provided at a position where the positioning projections 92a mesh with the internal teeth 34.
When the plate body 91 is rotated by operating the operation lever 93, the position of the positioning projection 9 is adjusted.
When 2a gets over the peak of the internal teeth 34, the mask piece 9
2 is elastically deformed inward in the radial direction of the plate body 91, and this force is transmitted to the operation lever 93, whereby a sense of moderation can be obtained.

The positioning projection 92a is not limited to a spot-like projection as shown in FIG. 6, but extends in the width direction bulging radially outward over the entire width of the mask piece 92. It may be a ridge.

The operation of the present invention will be described below with reference to FIGS. FIG. 7 shows a standard initial position of the seat back S2 (the seat back S2 in the lockable range).
FIG. 10 is an explanatory view showing a case where the memory plate 9 is set in position so that T1 is obtained at a position where the seat back S2 is locked at the forefront position. (B) shows a state in which the seat back S2 is tilted to the frontmost tilt position T3. FIG. 8 is an explanatory diagram showing a case where the memory plate 9 is set at the adjusted initial stage position T2 so that the initial stage position of the seat back S2 is located more backward than the standard one.
(A) is a state in which the seat back S2 is tilted and locked at the initial position, and (B) is a state where the seat back S2 is in the frontmost position T.
3 shows a state of being defeated.

First, as shown in FIG. 7A, when the position of the mask piece 92 is set so that the initial position of the seat back S2 becomes the standard initial position T1, the position of the seat back S2 is changed. A tilt lock region R1 is set between the upright position and the backward position. Therefore, in a state where the locking teeth 41a of the lock plate 4 are located within the tilt lock region R1, the locking teeth are moved by the urging force of the coil springs 84 (FIG. 2) moving radially outward of each lock plate 4. 41
In order to lock the tilting position of the seat back S2 by meshing with the internal teeth 34, the tilting position of the seat back S2 is selected while the meshing is released by operating the operation rod 7, and the tilting is stopped by stopping the operation. The seat back S2 can be locked at an arbitrary tilt position in the lock area R1.

When the lock is released by operating the operating rod 7 and the seat back S2 is tilted forward to get on and off the rear passenger, the second bracket 3 rotates clockwise about the cam shaft 6. As shown in (b) of FIG.
The locking teeth 41a are blocked by the mask pieces 92 and mesh with the internal teeth 34 even when the operation of the operation rod 7 is stopped, because the locking teeth 41a are disengaged from the tilt lock areas R1 and enter the unlock area R facing the mask pieces 92. And the seat back S2 is therefore
When biased in the forward leaning direction by an unillustrated biasing means, it is tilted to the most forward leaning position, whereby a passenger in the rear seat can get on and off.

Then, when a force is applied to the seat back S2 without operating the operating rod 7 at the time when the passenger in the rear seat has finished getting on and off, the locking teeth 41a of the lock plate 4 cause the mask piece 41 to move. When the seat back S2 is rotated clockwise around the camshaft 6 by sliding on the surface of the base 92, and the locking teeth 41a enter the tilt lock region R1, the internal teeth 34 are not masked here. The teeth 41a move in the radial direction by the urging force of the coil spring 84 and mesh with the internal teeth 34, whereby the seat back S2 moves the tilt lock region R1.
Is returned to the upright posture at the standard initial stage position T1 (FIG. 7A).

Next, as shown in FIG. 8A, when the plate main body 91 is rotated counterclockwise by a predetermined angle (operation angle) α by operating the operation lever 93, the unlock region R is thereby released. And the tilt lock area R1 are both moved around the camshaft 6 by the operation angle α, so that the adjusted initial stage position T2 tilted backward is formed. Therefore,
The tilting range of the seat back S2 moves backward by the operation angle α. The locking and unlocking operation of the seat back S2 at the set position and the shifting operation to the unlock area R are described in FIG. This is the same as described above based on a).

When the unlock area R and the tilt lock area R1 are shifted from the steady position shown in FIG. 7A by a predetermined angle α as shown in FIG. 8A, the rear passenger When the lock plate 4 is returned from the unlock area R to the tilt lock area R1 after the seat back S2 is tilted to the forward tilt position ((b) in FIG. 8) for getting on and off, the locking teeth 41a are The position of first engagement with the internal teeth 34 is adjusted to the adjusted initial position T2 (FIG. 8 (a)) which is retracted by the operation angle α of the operating lever 93 from the normal initial position S1 shown in FIG. Since the seat back S2 has changed, the seat back S2 is set at the tilt position corresponding to the initial stage position T2 after the adjustment.

Therefore, if the first stage position is set in advance according to the preference of the seated person by operating the memory plate 9, after the seat back S2 is moved to the frontmost position for getting on and off the rear passenger, Just by returning the seat back S2 to the original position, the seated person is locked at the initial position set according to his / her preference, so that the seat back S2 is once set to the initial position and the operating rod 7 is operated again as in the conventional case. This eliminates the need for the occupant to perform a troublesome operation of setting the occupant to a desired tilt position, thereby improving the operability of the recliner 1.

[0057]

According to the first aspect of the present invention, a memory plate is provided between the first and second brackets for masking the internal teeth to prevent the lock plate from meshing with the internal teeth. , An annular plate body,
A pair of mask pieces extending from the opposing peripheral surface of the plate body so as to mask the internal teeth of the circular recess in a predetermined range,
Since the operation lever is configured to protrude outward from the plate body and is used to rotate the plate body, the rotation of the memory plate by rotating the operation lever about the rotation center causes the plate to rotate. The mask position of the internal teeth can be changed by the mask piece provided on the main body.

Then, by changing the mask position of the internal teeth by the mask piece, the meshing position of the lock plate with the internal teeth is changed, whereby the lockable position of the tilting posture of the seat back can be changed. That is, it is possible to store the so-called lock-free position of the seat back in the memory plate.

As described above, since the lockable position of the seat back can be arbitrarily changed by rotating the plate body, the selection range of the tilting position of the seat back is expanded, and more suitable depending on the situation. The tilted position of the seat back can be immediately reproduced.

According to the second aspect of the present invention, since the plate body is provided with the operation lever for turning the plate body protruding outward, the plate body is operated by operating the operation lever. The mask piece can be rotated, and the position setting operation of the mask piece can be easily performed.

According to the third aspect of the present invention, since the mask pieces are provided with the positioning projections which are resiliently engaged with the internal teeth by elastic deformation, the memory plate is rotated by operating the operation lever so that the positioning projections are formed. Is disengaged from the internal teeth of the second bracket, a sense of moderation can be obtained by responding at this time, and the amount of rotation of the memory plate can be realized.

The once set rotation position of the memory plate is maintained by engaging the positioning projections with the internal teeth, so that the seat back is tilted unless the operation lever is operated by applying force. The inconvenience that the memory plate rotates together with the rotation of the lock plate can be avoided, and the once set lock-free range can be reliably maintained.

[Brief description of the drawings]

FIG. 1 is an explanatory side view showing an embodiment of a reclining seat to which a recliner structure 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 shown in FIG. 2;

FIG. 4 is a perspective view as viewed from the X-ray and the Y-ray in FIG. 2;

5A and 5B are front views showing one embodiment of a lock plate, wherein FIG. 5A shows a state in which locking teeth of the lock plate protrude from the guide groove to the outside, and FIG. Each state is shown.

FIG. 6 is a perspective view showing one embodiment of a memory plate.

FIG. 7 is an explanatory diagram for explaining an operation of the present invention;
The figure shows the case where the memory plate is set so that the standard initial position of the seat back can be obtained. (A) is a state where the seat back is tilted and locked at the initial position, and (B) is
Each of the figures shows a state in which the seat back is tilted to the foremost position.

FIG. 8 is an explanatory diagram for explaining the operation of the present invention;
Shows the case where the memory plate is set so that the initial position of the seat back is more backward than the standard one,
(A) shows a state where the seat back is tilted and locked at the initial position, and (B) shows a state where the seat back is tilted to the frontmost position.

[Explanation of symbols]

 2 1st bracket 3 2nd bracket 25 Guide groove 4 Lock plate 41 Locking tooth plate 41a Locking tooth 42 Hook-shaped plate 44a Locking projection 45 Curved concave 5 Cam 51b 2nd circular edge 6 Cam shaft 7 Operating rod 8 Holding Plate 9 Memory plate 91 Plate body 92 Mask piece 92a Positioning protrusion

Claims (3)

[Claims] A first bracket fixed to one of a seat bottom and a seat back; a second bracket fixed to the other and connected to the first bracket so as to be relatively rotatable around a rotation center; A cam interposed between the first and second brackets and rotated about the rotation center by operation of the operation rod; and a radial direction between the first and second brackets linked to forward / reverse rotation of the cam. A lock plate is provided on the first bracket, the lock plate is fitted into the first bracket, and a circumferential surface is formed in a circular convex portion along a circular locus around the rotation center, and the concave surface is formed in the circular convex portion. A guide groove is provided to guide the lock plate in and out, while the second bracket has a circular concave portion into which the circular convex portion is fitted in a sliding contact state, and a locking tooth at the tip of the lock plate protruding from the guide groove. Mesh with A sheet recliner provided with internal teeth formed on the inner peripheral surface of the circular concave portion and provided with urging means for urging the cam around a support shaft so that the lock plate projects from the guide groove; In the structure, a memory plate is interposed between the first and second brackets to mask the internal teeth and prevent the lock plate from meshing with the internal teeth.
An annular plate main body, extending from the opposing peripheral surface of the plate main body, and provided between the internal teeth of the circular concave portion and the circular convex portion so as to mask the internal teeth in a predetermined range. A seat recliner structure comprising a pair of mask pieces. 2. The seat recliner structure according to claim 1, wherein the plate main body is provided with an operation lever for rotating the plate main body protruding outward. 3. The recliner structure for a seat according to claim 1, wherein the mask piece has a positioning projection which is removably engaged with the internal teeth by elastic deformation.