JP2001025416A - Structure for mounting biasing means of recliner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of assembly man-hours and to obtain compactness while preventing appearance view from degrading. SOLUTION: This structure is provided with an internal tooth gear member 8 fixed to a back bracket 3, a lock plate 5 provided radially movably for a bottom bracket 2 and provided with fastening teeth 51 to be fastened to and unfastened from internal teeth 83a, and a base bracket 4, with a connecting rod 11 concentrically inserted, fixed to the bottom bracket 2. Then a spring mounting hole 44 of a larger inner diameter size than the outer diameter size of the connecting rod 11 is bored in the base bracket 4, and a biasing means is installed between the bottom bracket 2 and a cam member 6 in such a way as to hem the connecting rod 11 in a circular space between the inner circumferential surface of the spring mounting hole 44 and the outer circumferential surface of the connecting rod 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recliner interposed between a seat bottom and a seat back and configured to lock or unlock the tilting posture of the seat back. The present invention relates to a mounting structure of an urging means for applying an urging force to an operation lever for performing the operation.

[0002]

2. Description of the Related Art Conventionally, a seat recliner interposed between a seat bottom and a seat back has been known. This recliner includes a bottom bracket fixed to the seat bottom, and a back bracket fixed to the seat back and rotatably connected around a rotation center of the bottom bracket.

[0003] A cam is provided between the bottom bracket and the back bracket so as to be rotatable about the support shaft. This cam moves the lock plate provided with the locking teeth on the distal end face in the radial direction between the two brackets by the forward and reverse rotation of the support shaft. Further, the bottom bracket is provided with a guide groove having opposing walls extending in the radial direction and parallel to each other, and the locking teeth move forward and backward in the guide groove by the rotation of the cam, so that the locking teeth protrude from the guide groove. It is supposed to.

On the other hand, internal teeth are formed on the back bracket along a circular locus about the axis of the support shaft.
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 bottom bracket and the back bracket. When the engagement of the locking teeth with the internal teeth is released, the bottom bracket and the back bracket can rotate relative to each other.

[0005] Therefore, it is possible to lock the tilting position of the seat back by attaching the operation rod to the support shaft and rotating the support shaft forward and reverse by operating the operation rod to engage the locking teeth with the internal teeth. It is possible to change the tilting position by releasing the meshing.

[0006]

In the above-described recliner, the support shaft is urged in a predetermined direction around the axis by a predetermined urging means, whereby the cam rotates around the support shaft. The movement causes the lock plate to be pressed radially outward. Therefore, the locking teeth of the lock plate normally mesh with the internal teeth of the internal gear by the urging force of the urging means, thereby maintaining the tilting posture of the seat back set by this, while operating the operating rod to operate the operation lever. By rotating the support shaft in the opposite direction against the urging force of the urging means, the meshing is released and the seat back can be tilted.

Conventionally, a coil spring has been employed as the urging means as described above, and since this coil spring has been mounted on the operating rod, the coil spring is exposed to the outside, so that the recliner is externally fitted. There was a problem that it was hard to see.

In addition, since the coil spring is manually stretched between the operating rod and the frame of the seat, the above-described stretching operation must be performed after the recliner has been assembled to the seat. There is also a problem that the number of assembling steps increases, the assembling efficiency decreases, and the cost increases.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and can contribute to a reduction in the number of assembling steps while keeping the external appearance unobtrusive. It is an object of the present invention to provide a reclining device mounting structure that contributes to downsizing.

[0010]

According to the first aspect of the present invention,
A bottom bracket fixed to the seat bottom, and the bottom bracket is rotatably connected to the bottom bracket around a support shaft.
A back bracket fixed to the seat back; and a spring mounting structure for urging the two brackets of the recliner around the support shaft in opposite directions, the shaft of the support shaft fixed to the back bracket. An internal gear having internal teeth along a circular locus centered on a center; a lock plate provided with a locking tooth provided on the bottom bracket so as to be movable in a radial direction; The base bracket, which is fixed with the support shaft inserted concentrically into the bottom bracket and has a guide groove for guiding the movement of the lock plate, and the lock plate, which is co-rotated around the support shaft by operating an operation lever, A cam member for pressing in the direction of the internal teeth, and a through hole having an inner diameter larger than the outer diameter of the support shaft is formed in the base bracket. The biasing means is provided between the bottom bracket and the cam member while surrounding the support shaft in an annular space between the inner peripheral surface of the through hole and the outer peripheral surface of the support shaft. Things.

According to the present invention, the urging means for urging the lock plate in the guide groove outward in the radial direction of the base bracket is provided at the center position of the base bracket which cannot be seen from the outside. Because the mounting space is attached to the annular space around the support axis of the mounting hole using the thickness of the base bracket, the recliner is compact because the urging means is not exposed to the outside, and In this case, it is not necessary to provide locking means such as locking projections and bolts required at various places, which contributes to a reduction in the number of parts. Further, since the biasing means is mounted along the support shaft, the biasing means can be mounted using a predetermined mounting device which reciprocates along the axis of the support shaft, so that the assembling work of the recliner can be automated. To contribute. In addition, the appearance becomes unsightly.

[0012]

FIG. 1 is a side view showing an embodiment of an automobile seat to which a recliner according to the present invention is applied. As shown in FIG.
The seat back S2 is composed of a seat bottom S1 and a seat back S2, and the rear edge of the seat bottom S1 and the lower edge of the seat back S2 are connected by the recliner 1 according to the present invention, so that the seat back S2 can be tilted back and forth. And is in a state of being erected at the rear edge of the seat bottom S1.

FIG. 2 is an exploded perspective view showing an embodiment of the recliner 1, and FIG. 3 is an assembled perspective view thereof. FIG. 4 is a sectional view taken along line AA of FIG. As shown in these figures, a recliner 1 includes a bottom bracket 2 fixed to a rear edge of a seat bottom S1 and a back bracket 3 opposed to the bottom bracket 2 and fixed to a lower edge of a seat back S2. And a basic configuration including:

The recliner 1 has a circular base bracket 4 fixed to the bottom bracket 2 via the back bracket 3, three lock plates 5 mounted on the base bracket 4, and pivots around the center. And a cam member 6 for moving these three lock plates 5 outward in the radial direction of the base bracket 4.

Further, the recliner 1 is provided between the base bracket 4 and a circular lever 7 which rotates concentrically with the cam member 6 and reverses to pull the three lock plates 5 toward the center. The lock is released with respect to the back bracket 3 in which the relative rotation between the internal gear member 8 fixed to the back bracket 3 and the bottom bracket 2 while the cam member 6 and the circular lever 7 are held therebetween is locked. An operation lever 9 for performing an operation (unlock operation) is provided.

At the center of the relative rotation between the bottom bracket 2 and the back bracket 3, a connecting rod 11 extending in the vehicle width direction penetrates. The connecting rod 11 is also penetrated by the base bracket 4, the cam member 6, the circular lever 7, and the internal gear member 8, and an operation lever 9 is fixed to a distal end thereof. Connecting rod 1
By rotating the back bracket 3 around the axis, the rotation of the back bracket 3 normally set in the locked state is unlocked.

The connecting rod 11 comprises a cylindrical rod body 12 and a prism 13 extending from the distal end of the rod body 12. The bottom bracket 2 in which the flange 14 is provided in the rod body 12 slightly from the base end near the prism 13 is formed by pressing a thin (for example, 2 mm thick) metal plate. The bottom bracket 2 has a rectangular portion 2 formed to be bolted to the seat bottom S1.
1 and a semicircular arc portion 22 having an upper edge extending upward from the rectangular portion 21 and projecting upward.

A loose fitting hole 23 for loosely fitting the connecting rod 11 is formed at the center of curvature of the arc portion 22. Above the loose fitting hole 23, a groove 24 cut in the radial direction is formed.

The bottom bracket 2 has a folded edge 25 formed by folding the peripheral edge, and a bulging portion 26 surrounded by the folded edge 25 is formed at the center position. . The bulging portion 26 has a flat surface on the right side in FIG. 2 and is flush with the folded edge portion 25. At the lowermost position of the folded edge 25, a locking protrusion 27 protruding rightward is provided.

The back bracket 3 is rotatably connected to the bottom bracket 2 around the center of the loose fitting hole 23, and is formed by pressing a metal plate similar to the above. The back bracket 3 includes a rectangular portion 31 formed to be bolted to the seat back S2, and a semicircular arc having a lower edge extending downward from the rectangular portion 31 and projecting downward. And a section 32.

The connecting rod 11 is inserted through the center of curvature of the arc portion 32 and the base bracket 4
The mounting hole 33 for mounting the. A cut-and-raised piece 34 protruding leftward in FIG. 2 is provided at the upper edge of the mounting hole 33. The cut-and-raised piece 34 comes into contact with the inside of the folded edge 25 of the arc portion 22 in a state where the back bracket 3 is connected to the bottom bracket 2.

The back bracket 3 has a folded edge 35 formed by folding the peripheral edge toward the right. In particular, the folded edge 35 of the arc portion 32 is larger than that of the rectangular portion 31. The width is set to be large, and the caulked edge portion 36 is formed at the portion having the large width.
A mounting space 37 for mounting the lock plate 5, the base bracket 4 provided with the cam member 6 and the circular lever 7, and the internal gear member 8 is formed in the space surrounded by the caulking edge portion 36. .

The base bracket 4 is formed by subjecting a thick (for example, approximately 5 mm thick) metal plate to a half blanking press working. Such base bracket 4
The bracket main body 41 is mounted in the mounting space 37 in a state where a slight gap is formed between the inner wall surface of the back edge 3 of the back bracket 3 and the bracket main body 41. The bracket main body 41 projects concentrically from the left side of the bracket main body 41. Further, an annular projection 42 is fitted into the mounting hole 33 of the back bracket 3 in a sliding contact state.

The bracket main body 41 has an annular groove 43 formed by recessing a portion corresponding to the annular protrusion 42 on the right side thereof, and is concentric with the loose fitting hole 23 of the bottom bracket 2 at the center. And a spring mounting hole 4 whose diameter is set to be larger than that of the loose fitting hole 23.
4 are drilled. A groove 45 corresponding to the groove 24 of the loose fitting hole 23 of the bottom bracket 2 is provided at an edge of the spring mounting hole 44.

In the outer part of the spring mounting hole 44, a circular cam mounting recess 4 is formed concentrically with the hole center.
6 are provided. The cam mounting recess 46 is for mounting a cam member 6 described in detail later. Further, between the cam mounting concave portion 46 and the annular groove 43, opposing groove walls extending in the radial direction have guide grooves 47 parallel to each other.
Are formed in the circumferential direction at equal pitches, thereby forming three fan-shaped bulging portions 48 bulging rightward in a portion surrounded by each guide groove 47, the cam mounting concave portion 46, and the annular groove 43. ing.

The base bracket 4 has the annular projection 42 fitted in the mounting hole 33 of the back bracket 3 positioned so that the spring mounting hole 44 and the loose fitting hole 23 are concentric. The back bracket 3 is integrally fixed to the bottom bracket 2 by being brought into contact with the bulging portion 26 of the bottom bracket 2 by, for example, being welded thereto. It is in a state of being left.

FIG. 5 shows the guide groove 47 and the lock plate 5.
FIG. 5 is an explanatory diagram for describing a relative positional relationship between the cam member 6 and a cross section taken along line BB of FIG. 4. (A) shows a state where the cam member 6 is located at the lock position, and (B) shows a state where the cam member 6 is located at the unlock position. As shown in FIG. 5, the guide groove 47 is formed such that the reference groove extends vertically above the spring mounting hole 44, and the other two grooves are out of phase by 120 ° clockwise from the reference groove. Each is provided in a state. The lock plate 5 has a thickness set to be the same as the depth of the guide groove 47 of the base bracket 4, has a width set slightly smaller than the groove width of the guide groove 47, and is fitted in the guide groove 47. In the sliding state, it can move forward and backward in the radial direction.

The lock plate 5 has a guide groove 47.
Is set to be longer than the length by a predetermined dimension, and the arc-shaped end portion 52 on the hole center side of the spring mounting hole 44 projects in the hole direction from the guide groove 47 in a state of being fitted in the guide groove 47. Further, an arc surface having the same radius of curvature as the radius of the internal teeth 83a of the internal gear member 8 described later is formed on the end surface of the lock plate 5 opposite to the arc end portion 52, and this arc surface has an inner surface. The locking teeth 51 that mesh with the teeth 83a are provided.

A first guided protruding piece 53 is provided on the right side of each lock plate 5 shown in FIG. 2 and the lock plate 5 at the front position (left side on the paper surface of FIG. 5). In addition to the first guided protruding piece 53, a second guided protruding piece 54 protrudes outward in the radial direction. The first guided protruding piece 53 is a guide elongated hole 74 (described later) of the circular lever 7.
The second guided protruding piece 54 is engaged with an annular guide groove 85 of the internal gear member 8, which will be described later.

The cam member 6 has three cams 61 corresponding to the lock plate 5 protruding radially from the center position at a constant pitch in the circumferential direction. Each cam 61
The distal end surface is formed in an arc shape so as to be in sliding contact with the inner peripheral surface of the cam mounting concave portion 46, so that the distal end surface can rotate around the hole center while being fitted into the cam mounting concave portion 46. The lock plate 5 is provided between the adjacent cams 61.
Each of the recessed portions 62 into which the arc-shaped end portion 52 can be drawn is provided.

The space between the drawing recesses 62 on the counterclockwise side is formed in a cliff-like shape, whereas the clockwise side is formed with a gentle bending surface. Therefore, by rotating the cam member 6 counterclockwise around the center of rotation in a state where the arc-shaped end portion 52 is fitted in the drawing concave portion 62 as shown in FIG. The arcuate ends 52 are sequentially pressed outward in the radial direction by the gentle portions, and as a result, as shown in FIG. From the outside.

The cam member 6 has a square hole 6 into which the prism 13 of the connecting rod 11 is fitted at the center position.
3 and a plurality of locking projections 64 projecting rightward from the right side at equal pitches in the circumferential direction on a circular locus centered on the hole center of the square hole 63. I have. The locking projection 64 is for connecting the cam member 6 to the circular lever 7.

The circular lever 7 has a diameter dimension of the cam member 6.
Is slightly larger than the maximum diameter (distance between the center of the cam member 6 and the tip end of the cam 61), and a lever hole 71 is formed at the center position. A cut-and-raised piece 72 protruding leftward by the cut-and-raise process when drilling. The circular lever 7 has a connection hole 73 at a portion corresponding to the locking projection 64 of the cam member 6, and a portion corresponding to the first guided projection 53 of the lock plate 5 at a portion thereof. A guide elongated hole 74 extending in the circumferential direction is formed.

The elongated guide hole 74 extends from the center position in the clockwise and counterclockwise directions at substantially equal distances, and has a radial dimension larger than the radial dimension of the first guided projection 53. 74a and the first guided projection 53 provided adjacent to the loose fitting guide hole 74a in the counterclockwise direction.
And a sliding contact guide hole 74b that can be fitted in the sliding contact state. A gentle slope is formed at the outer edge of the boundary between the loose fitting guide hole 74a and the sliding contact guide hole 74b.

The loose-fit guide hole 74a has a position where the arc-shaped end 52 of the lock plate 5 contacts the cam 61 of the cam member 6 and a position where the arc-shaped end 52 is drawn into the drawing recess 62. The first guided protrusion 53 is dimensioned such that the first guided protrusion 53 can move in the forward and reverse directions in the radial direction.
It is dimensioned so that it can be maintained in a state of being fitted into the.

Therefore, as shown in FIG. 5A, when the cam 61 is in contact with the arc-shaped end 52, the locking teeth 51 of the lock plate 5 are moved out of the guide groove 47 of the base bracket 4 to the outside. 5B, when the cam member 6 is turned clockwise, the arc-shaped end 52 is drawn into the drawing recess 62, as shown in FIG. The locking teeth 51 of the lock plate 5 enter the guide groove 47.

A spiral lock spring 40 for urging the cam member 6 counterclockwise around the connecting rod 11 is mounted in the spring mounting hole 44 of the base bracket 4. The lock spring 40 is mounted on the base bracket 4 with the base bracket 4 fixed to the bottom bracket 2 via the back bracket 3 and the base bracket 4, the lock plate 5, the cam member 6, and the circular lever 7 assembled to the base bracket 4. Spring mounting hole 4 of bracket 4
4 is attached.

More specifically, the loose fitting hole 23 of the bottom bracket 2, the spring mounting hole 44 of the base bracket 4, the square hole 63 of the cam member 6, and the lever hole 71 of the circular lever 7.
The lock spring 40 is fitted into the prism 13 of the connecting rod 11 inserted into the connecting rod 11 and is mounted in the spring mounting hole 44. The lock spring 40 mounted in the spring mounting hole 44 is in a state of being charged in the counterclockwise direction, and the outer locking end 40 a is fitted into the groove 45 of the base bracket 4 while the lock spring 40 is mounted inside the lock spring 40. An inner locking end portion 40 b formed by being bent inward is locked to the cut-and-raised piece 72 of the circular lever 7.

Therefore, the cam member 6 is normally urged counterclockwise around the connecting rod 11 through the circular lever 7 by the urging force of the lock spring 40, whereby the cam 61 presses the lock plate 5. As a result, the locking teeth 51 protrude outside from the guide grooves 47.

FIG. 6 shows the loose fitting hole 23 of the bottom bracket 2.
Groove 24 and spring mounting hole 4 of base bracket 4
FIG. 9 is a front view showing a relative positional relationship with a groove 45 of FIG. FIG.
As shown in the figure, the groove 2 of the loose fitting hole 23 of the bottom bracket 2
4 has a groove width dimension smaller than that of the groove 45 of the spring mounting hole 44 of the base bracket 4. Accordingly, the lock spring 40 is mounted on the spring mounting hole 44 in a state where the lock spring 40 is reduced in diameter and urged by a predetermined spring mounting device so that the diameter thereof is smaller than the diameter of the spring mounting hole 44, so that the lock spring 40 is Since the original diameter is restored, the outer engagement end 40a abuts on the right groove wall of the groove 45 by this restoration, and the inner engagement end 40b is formed by the cut-and-raised piece 72 of the circular lever 7. The lock springs 40 are locked by the spring hooks 72a so that the lock springs 40 are reliably prevented from falling out in a state where the lock springs 40 are mounted in the spring mounting holes 44, and are prevented from falling out.

The internal gear member 8 is fixed to the back bracket 3 with the base bracket 4, the lock plate 5, the cam member 6, and the circular lever 7 sandwiched between the internal gear member 8 and the back bracket 3. (For example, approximately 5m
m thickness) metal plate is subjected to a half punching press working. As shown in FIG. 2, the internal gear member 8 includes a gear member main body 81 having a rectangular upper part and an arcuate lower part, and a circular internal tooth protruding from the right side of the gear member main body 81. And a gear 82.

The internal gear 82 is formed by providing internal teeth 83a over the entire circumference on an inner peripheral surface of an annular body 83 fitted in the annular groove 43 of the base bracket 4 in a sliding state. . The internal teeth 83a are connected to the lock plate 5
The shape is set so as to mesh with the locking teeth 51.

The gear member main body 81 is provided with the circular lever 7 recessed at a position inside the internal teeth 83a of the internal gear 82.
Has a storage recessed portion 84 for storing therein. A circular hole 84 for inserting the prism 13 of the connecting rod 11 is formed at the center position of the bottom plate of the storage recess 84.

Then, between the internal gear member 8 and the back bracket 3, the base bracket 4, the lock plate 5,
By bending the caulking edge portion 36 of the back bracket 3 inward while holding the cam member 6 and the circular lever 7 therebetween, the internal gear member 8 is attached to the back bracket 3 as shown in FIG. It is in a state of being fixed integrally.

FIG. 7 shows the lock plate 5 and the storage recess 84.
FIG. 5 is an explanatory diagram for explaining a relative positional relationship between the annular guide groove 85 formed in FIG. 4 and a cross section taken along line CC of FIG. 4. (A) is a state where the second guided protrusion 54 of the lock plate 5 is fitted in the wide guide groove 85a, and (B) is a state where the second guided protrusion 54 is fitted in the narrow guide groove 85b. Each state is shown as being stuck.

As shown in FIG. 7, the annular guide groove 85
When the circular lever 7 is housed in the housing recess 84 of the gear member main body 81, the outer peripheral surface of the circular lever 7 and the housing recess 84
Is formed between the inner peripheral surface and the inner peripheral surface. The annular guide groove 85 includes a wide guide groove 85a formed at a lower position so that the central angle is approximately 120 ° and having a groove width dimension larger than the radial dimension of the second guided projection piece 54; The guide projection 54 includes a narrow guide groove 85b which is fitted in a sliding contact state.

In the wide guide groove 85a, the locking teeth 51 of the lock plate 5 protrude and retract from the guide groove 47 of the base bracket 4 when the second guided protruding piece 54 moves forward and backward in the groove in the groove. The dimensions are set as follows. Therefore, the seat back S2 is located between the forward posture in which the seat back S2 is inclined forward by, for example, 30 ° from the vertical axis, and the horizontal posture in which the seat back S2 is inclined backward by 90 ° from the vertical axis (the inclination posture settable range α). 7, the locking teeth 51 of the lock plate 5 can be made to protrude and retract from the guide groove 47 by operating the operation lever 9, as shown in FIG. When S2 is within the tilting posture settable range α, the tilting posture of the seat back S2 can be arbitrarily set.

On the other hand, the narrow guide groove 85b is
Since the groove width dimension is set so as to restrict the movement of the guided protruding piece 54 in the radial direction, in the tilt range in which the tilted position is tilted further forward than the tiltable position settable range α (the tiltable position setting impossible range β). As shown in FIG. 7 (b), the movement of the second guided protrusion 54 outward in the radial direction is restricted by the narrow guide groove 85b, so that the locking teeth 51 of the lock plate 5 47 (FIG. 2) is maintained, and the locking teeth 51 cannot mesh with the internal teeth 83a of the internal gear 82, so that the seat back S2 can be arbitrarily tilted within the tilting range setting range β. Posture is not maintained.

Then, by positioning the seat back S2 in the range β in which the tilting posture cannot be set, the second guided projection 5
When the lock member 40 is fitted into the narrow guide groove 85b, as shown in FIG. 7B, the peripheral portion of the cam member 6 is moved to the lock plate 5 at the point B by the urging force of the lock spring 40 (FIG. 2). And presses the lock plate 5 outward by contacting with the arc-shaped end portion 52 of the first guide member 53 so that the first guided projection 53 is pressed against the edge of the sliding contact guide hole 74b. Since the two guided protrusions 54 are in contact with the edge of the narrow guide groove 85b, the cam member 6 is prevented from rotating in the counterclockwise direction. The two lock plates 5 having no are also kept in the unlocked state.

The operation lever 9 is, as shown in FIG.
It comprises a straight lever body 91, a cylindrical body 92 fixed to the base end side of the lever body 91, and a handle 93 fixed to the tip side. At one end surface of the cylindrical body 92, a square hole 92a into which the prism portion 13 of the connecting rod 11 is fitted is recessed, and at the other end surface, an insertion hole 92b through which a screw 94 is inserted is formed. ing. While the insertion hole 92b communicates with the square hole 92a, a screw hole 13a into which a screw 94 is screwed is screwed into the end face of the prism 13 of the connecting rod 11, and projects outward from the internal gear member 8. When the screw 94 is inserted into the insertion hole 92b and screwed into the screw hole 13a and fastened with the square hole 92a externally fitted to the square pillar portion 13, the operation lever 9 is connected to the connecting rod 11. .

In the recliner 1, a return spring 95 composed of a spiral spring is provided between the operation lever 9 and the internal gear member 8 to urge the seat back S 2 forward. The return spring 95 has an outer locking end 95a formed by bending an outer end outward, and an inner locking end 95b formed by bending an inner end inward. And As shown in FIG. 3, the outer locking end 95a is locked to the locking projection 27 of the bottom bracket 2, and the inner locking end 95b is fixed to the internal gear member 8 as shown in FIG.
The back bracket 3 is locked via the internal gear member 8 by being locked by a locking projection 86 protruding toward the outside.
Is applied to the connecting rod 11 in a counterclockwise direction, whereby the seat back S2
It is always biased forward.

[0052]

According to the first aspect of the present invention, the urging means for urging the lock plate in the guide groove outward in the radial direction of the base bracket cannot be visually recognized from the outside. Mounted in the annular space around the support axis of the mounting hole provided at the center position of the bracket, the recliner is compact because the biasing means is not exposed to the outside, and it is necessary when installing the biasing means outside There is no need to provide any locking means such as locking projections or bolts at various places, which can contribute to a reduction in the number of parts and a reduction in the number of assembling steps. In addition, the appearance can be made simple and beautiful.

[Brief description of the drawings]

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

FIG. 2 is an 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 sectional view taken along line AA of FIG. 3;

5 is an explanatory view (a sectional view taken along the line BB in FIG. 4) for explaining a relative positional relationship between a guide groove, a lock plate, and a cam member. FIG. (B) shows a state where the cam member is located at the lock position.

FIG. 6 is a front view showing a relative positional relationship between a groove of a loose fitting hole of the bottom bracket and a groove of a spring mounting hole of the base bracket.

FIG. 7 is an explanatory view (a sectional view taken along the line CC in FIG. 4) for explaining a relative positional relationship between the lock plate and an annular guide groove formed in the storage recess; (B) shows a state in which the second guided protrusion of the plate is fitted in the wide guide groove, and (b) shows a state in which the second guided protrusion is fitted in the narrow guide groove.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Recliner 11 Connecting rod 2 Bottom bracket 3 Back bracket 4 Base bracket 44 Spring mounting hole 5 Lock plate 51 Locking tooth 6 Cam member 7 Circular lever 8 Internal gear member 83a Internal tooth

Claims (1)

[Claims] 1. A recliner comprising: a bottom bracket fixed to a seat bottom; and a back bracket fixed to a seat back and rotatably connected to the bottom bracket around a support shaft. Further, an internal gear provided with internal teeth along a circular locus about the axis of the support shaft, and a locking tooth provided on the bottom bracket so as to be movable in a radial direction and engaged with and disengaged from the internal teeth. A lock plate with a, and the support shaft was fixed to the bottom bracket in a state of being inserted concentrically,
A base bracket having a guide groove for guiding the movement of the lock plate; and a cam member for rotating the support plate around the support shaft by operating the operation lever to press the lock plate in the direction of the internal teeth. A through hole having an inner diameter larger than the outer diameter of the support shaft is provided, and the urging means is provided in an annular space between the inner peripheral surface of the through hole and the outer peripheral surface of the support shaft. A biasing means mounting structure for a recliner, wherein the biasing means is mounted between the bottom bracket and the cam member while surrounding the support shaft.