JP2001346644A - Seat reclining structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent any inconvenience in the returning operation of the seat- back from the forward to the stand-up position and any increased force required for the returning operation, and further prevent generation of any noise due to shaking of the seat-back when setting to the forward position. SOLUTION: The seat reclining structure comprises a lock device 8 for fixing in a desired position the seat-back 4 which is installed capable of sliding backward and forward and an energizing means 11 for energizing to slide the seat- back 4 in the direction of forward tilted position, and the lock device 8 and the energizing means 11 are structured to operate in the reclining operation area on the rear side of the stand-up position in the sliding operation area of the seat-back 4. And a holding mechanism 22 for holding the seat-back 4 in the forward tilted position is provided and the holding mechanism 22 is structured to unlock the holding of the forward tilted position of the seat-back 4 by a sliding operation force to the back side of the seat-back 4 which is larger than the holding force.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a lock device for fixing a seat back mounted to be able to swing back and forth in a desired posture, and an urging means for urging the seat back to swing forward. Seat reclining structure.

[0002]

2. Description of the Related Art Conventionally, in a seat reclining structure as described above, for example, as disclosed in Japanese Patent Application Laid-Open No. 10-99157, the swing operation range of the seat back is switched to the seat back forward posture. By setting so that the seat back can be used, a part of the living room where the seat is arranged can be used as a luggage room, and the seat back in which the locking device is switched to the forward tilted position can be fixed in that position. In some cases, noise caused by rattling of the seat back during traveling with the seat back switched to the forward leaning posture is prevented. In this prior art, a spiral spring configured to urge the seat back to swing forward only in the reclining operation area on the rear side from the standing posture of the seat back is used as the urging means. .

[0003]

However, according to the above-mentioned prior art, when the seat back is returned from the forward leaning position to the upright posture in which the reclining operation can be performed, the fixing of the seat back by the locking device in the forward leaning position is released. However, since it is necessary to perform a complex operation such as swinging the seat back toward the rear standing posture,
The operation of returning the seat back from the forward leaning posture to the standing posture was troublesome.

Incidentally, in the above-mentioned prior art, a spiral spring, which is an example of an urging means configured to urge the seat back to swing forward only in the reclining operation area, is tilted forward from the reclining operation area. If the seat back is oscillated in the forward tilting direction in the entire swing operation range of the seat back over the range, the seat device can be urged by the spiral spring even if the lock device is not configured as in the related art. When returning the seat back from the forward leaning position to the upright posture, the back can be held in the forward leaning position, thereby preventing the generation of abnormal noise due to rattling of the seat back switched to the forward leaning position. It is possible to save the trouble of releasing the lock device at the same time, but on the other hand, from the posture where the seat back is moved forward When switching to the upright position, a large operating force is required to resist the weight of the seat back and the biasing force of the spiral spring, and the biasing force of the spiral spring in the reclining operation area becomes too strong to perform the reclining operation. In order to avoid such inconvenience, if the number of turns of the spiral spring is increased and the spring constant is moderated, the spiral spring will increase in size accordingly. It becomes necessary to make an improvement to secure a large installation space in which it can be installed.

SUMMARY OF THE INVENTION It is an object of the present invention to prevent the inconvenience of returning the seat back from the forward tilted posture to the standing posture and to increase the operating force required for the returning operation.
An object of the present invention is to prevent generation of abnormal noise due to rattling of a seat back switched to a forward leaning position.

[0006]

Means for Solving the Problems [Structure] In order to achieve the above object, according to the first aspect of the present invention, there is provided a lock for fixing a seat back mounted to be able to swing back and forth in a desired posture. In a seat reclining structure including a device and an urging means for urging the seat back to swing forward, the locking device and the urging means move rearward from a standing posture in a swing operation area of the seat back. And a holding mechanism for holding the seat back in a forward tilted position, wherein the holding mechanism is configured to swing the seat back rearward with respect to the seat back larger than the holding force. The seat back is released from being held by the force in the forward leaning posture.

According to the first aspect of the present invention, in the reclining operation area, the seat back can be fixed in a desired reclining posture by the locking device, and the urging is performed by performing the releasing operation of the locking device. The seat back can be swung back from the desired reclining posture to the standing posture by the swing urging of the means, and the seat back that has been swung back to the standing posture is caused to swing forward, whereby the seat back is moved forward. The seat back can be switched to the posture, and the seat back can be held in the forward leaning posture by the holding mechanism.

In the state where the seat back is held by the holding mechanism in the forward leaning posture, a greater swinging operation force to the rear side than the holding force of the holding mechanism is applied to the seat back, whereby the seat by the holding mechanism is provided. The back can be released from the forward tilted position, and after the release, the seat back can be returned to the upright position by applying a swing operation force against the weight of the seat back to the seat back. After returning, the locking device is released and the seat back is given a rocking operation force against the rocking bias of the biasing means so that the seat back can be returned from the standing posture to the reclining operation area. To a desired position, and the locking device can fix the seat back in a desired reclining posture.

That is, since the seat back can be held in the forward tilted position by the holding mechanism, it is possible to prevent generation of unusual noise due to rattling of the seat back switched to the forward tilted position, and to raise the seat back from the forward tilted position. At the beginning of the switching operation, a simple operation of applying a swing operation force larger than the holding force of the holding mechanism to the seat back in the rearward direction as the switching direction, Since the holding mechanism can release the seat back in the forward tilted position, the seat back can be released while performing the lock device release operation, which is required when the seat back is held in the forward tilted position. It is not necessary to perform a complicated compound operation such as swinging the camera backward.

Further, since the urging means swings and urges the seat back in the forward leaning direction only in the reclining operation area, the urging means can hold the seat back in the forward leaning posture. When the urging means is configured to urge the seat back to swing forward in the entire swing operation range of the seat back, when switching the seat back from the forward leaning posture to the standing posture, the weight and swirl of the seat back are generated. Inconveniences such as the necessity of a large swinging operation force against the urging force of the spring and the urging force of the spiral spring in the reclining operation area becoming too strong to make the reclining operation difficult. Nor.

[Effect] Therefore, the seat back can be held in the forward leaning posture by the holding mechanism,
The simple operation of swinging the seatback in the forward-tilted position backwards can release the seatback in the forward-tilted position and switch from the forward-tilted position to the upright position in a series. It is possible to prevent generation of unusual noise due to rattling of the seat back switched to the forward leaning position without inconvenience of returning operation from the forward leaning position to the standing posture and an increase in operation force required for the returning operation. It became so.

[Structure] According to a second aspect of the present invention, in the first aspect, the lock device includes the holding mechanism.

According to the second aspect of the present invention, the components of the lock device can be effectively used for the holding mechanism in forming the holding mechanism.

[Effects] Therefore, the number of components constituting the holding mechanism can be reduced, so that the configuration can be simplified and the manufacturing cost can be reduced.

According to a third aspect of the present invention, in the second aspect of the present invention, a plurality of occlusal teeth are formed at a position corresponding to the reclining operation area on the fixed portion side. A movable plate that is provided with an occlusal tooth meshing with the occluded tooth on the seat back side, and that can be changed in position between an meshing position and a meshing release position, and from the meshing position of the movable plate. A swinging member capable of swinging between a tensioning position for preventing the movement of the member and a tensioning release position for allowing the movement to the meshing release position, and urging the rocking member in the direction of the tension. The locking device is configured by providing a biasing spring that performs the above-mentioned operation. And configuring the retaining mechanism to form a shallow engagement recess depths than tooth.

According to the third aspect of the invention, in the reclining operation area, the movable plate is shifted from the disengaged position to the engaged position by engaging the occlusal teeth of the movable plate with the occlusal teeth of the base plate. The movable member is prevented from moving from the meshing position by the swinging member being biased by the swinging force of the biasing spring, so that the seat back can be fixed in a desired reclining position. The movable member can be moved to the disengagement position by switching the swinging member to the tension release position against the biasing force of the swing, thereby releasing the seat back from being fixed in the desired reclining position. At the same time, the seat back can be returned from the desired reclining posture to the standing posture by the swing urging of the urging means. By swinging the seat back that has returned to the forward direction toward the front, the seat back can be switched to the forward tilted posture, and accordingly, the occlusal teeth of the movable plate engage with the engagement recesses of the base plate, The position of the movable plate is changed from the disengagement position to the engagement position side, and the swinging member is slightly stretched by the urging force of the urging spring, thereby suppressing the movement of the movable plate to the engagement disengagement position side. The back can be held in a forward leaning posture.

In the state where the seat back is held by the holding mechanism in the forward leaning position, when a rearward swinging operation force larger than the holding force of the holding mechanism is applied to the seat back, the seat back is generated accordingly. The detaching force for detaching the occlusal teeth on the seat back side from the engaging concave portion on the fixed portion side exceeds the pushing force of the swinging member which has tended to be pushed by the swinging bias of the biasing spring. Therefore, the movable member is allowed to move to the disengagement position together with the switching of the swinging member to the tension releasing position against the swinging bias of the biasing spring, so that the occlusal tooth is moved from the engagement recess. The released holding release state can be displayed. After the release, the seat back can be returned to the upright posture by applying a swing operation force against the weight of the seat back to the seat back, and after the return, the swing member is released from tension. By applying a swing operation force against the swing bias of the biasing means to the seat back in the state switched to the posture, the seat back can be swung from the standing posture to a desired position in the reclining operation area. In a state where the seat back is located at a desired position in the reclining operation area, by allowing the swing member to be switched to the stretching posture by the swing biasing of the biasing spring, the movable plate is moved to the occlusal tooth of the base plate. A fixed state in which the movable plate is prevented from moving from the meshing position where the occlusal teeth mesh can be exhibited.

In other words, the lock device is provided with a very simple improvement by forming an engagement recess having a depth smaller than that of the occluded tooth at a predetermined position of the base plate, which is one of the components constituting the lock device. The holding mechanism can be configured by the constituent parts, the base plate, the movable plate, the swing member, and the biasing spring.

[Effect] Accordingly, it is not necessary to newly provide a part dedicated to the holding mechanism in configuring the holding mechanism, so that the structure can be simplified and the manufacturing cost can be effectively reduced.

[0020]

1 and 2 show a bench-type rear seat 1 disposed at the rear of a passenger car. The rear seat 1 is provided on a seat cushion 3 connected to a floor 2 of a vehicle body. By connecting the left and right seat backs 4 via the corresponding reclining devices 5, the left and right seat backs 4 can be set to desired reclining postures, respectively, and can be switched to the forward leaning posture. I have. Reference numeral 6 shown in FIGS. 1 and 2 is a cover that covers an exposed portion of the reclining device 5.

As shown in FIGS. 2 to 7, each reclining device 5 includes a pair of left and right swing arms 7 and 7 that support the corresponding seat back 4 so as to be able to swing back and forth around a horizontal axis P1. A lock device 8 for fixing the swing arm 7 in a desired swing posture in a reclining operation area on the rear side of the standing posture, an operating tool 10 for releasing the locking of the swing arm 7 by the lock device 8 via a linking mechanism 9, and a reclining operation And a spiral spring 11 which is an example of an urging means for urging the swing arm 7 in the forward tilting direction in the region. The swing arm 7, the lock device 8, and the spiral spring 11 are mounted on the seat cushion 3 on the fixed portion side in the seat reclining structure.
The seat reclining structure is provided on a shoulder portion of the seat back 4 which is a movable portion side.

As shown in FIGS. 3 to 8, each swing arm 7 is provided with a connecting portion 7A connected to the back surface of the seat back 4, and the connecting portion 7A is biased to the seat back 4 side. In this state, a locking claw 7a extending toward the free end of the swing arm 7 and two through holes 7b for bolt connection are formed. The locking claw 7a is adapted to position the seat back 4 with respect to the swing arm 7 by engaging with an engaging hole 4a formed in the plate 4A forming the back surface of the seat back 4. Is inserted, the connection bolts 12 are inserted into the respective through holes 7b, and the seat back 4
The seat back 4 can be connected to the connecting portion 7A by screwing into the screwing portion 4b provided on the plate 4A.

As shown in FIG. 3 to FIG.
A base plate 13 bolted to the seat cushion 3, a movable plate 14 supported by the swing arm 7 so as to be able to swing around the horizontal axis P2, and a swing arm 7 capable of swinging around the horizontal axis P3. It is constituted by a supported swing member 15, and the like. The base plate 13 supports the support shaft 16 fixed to the swing arm 7 so as to be rotatable around the horizontal axis P1.
And the upper edge 13
A plurality of occlusal teeth 13a are formed at the rear portion corresponding to the reclining operation area in A. The movable plate 14 includes a plurality of occlusal teeth 14a that mesh with the occlusal teeth 13a of the base plate 13, and has a horizontal axis P2.
By swinging around, the occlusal teeth 14a are changed to the occlusal teeth 13a.
The position can be changed between a meshing position where the meshing is performed and a meshing canceling position where the meshing with the occluded tooth 13a is canceled. The swing member 15 is prevented from moving from the meshing position of the movable plate 14 by entering between the horizontal axis P3 which is the swing fulcrum and the contact portion 14A formed at the free end of the movable plate 14. Swing about the horizontal axis P3 over the tension posture and the tension release posture in which the free end faces the concave portion 14B formed in the movable plate 14 to allow the movable plate 14 to move to the disengagement position. Further, from the support plate 17 which swings integrally around the swing arm 7 and the horizontal axis P1 to the operated arm 18 which swings integrally around the swing member 15 and the horizontal axis P3. It is oscillatingly urged in the tension direction by an erected urging spring 19.

As shown in FIG. 9A, the tension of the swinging member 15 is determined by the movable plate 14 and the swinging member 1.
5 and a line L1 connecting a horizontal axis P2 which is a pivot point of the movable plate 14, the contact point and the pivot member 1
The line L2 connecting the horizontal axis P3, which is the swing fulcrum of No. 5, is orthogonal to the horizontal axis. As shown in FIG. 5, in the posture in which the swing member 15 is released from the tension, the free end side of the swing member 15 comes into contact with the rear end edge of the concave portion 14 </ b> B of the movable plate 14 to push up the movable plate 14. It has become.

As shown in FIGS. 2 to 8, the linkage mechanism 9 includes an operated arm 18 supported by the swing arm 7 and a crank arm 20 supported by the seat back 4 so as to be able to swing around the horizontal axis P4. And a link rod 21 erected between the operating tool 10 provided on the seat back 4 and one free end of the crank arm 20, and the like. A contact pin 20 </ b> A that comes into contact with the operated arm 18 by the urging of the urging spring 19.
The contact pin 20A on the seat back 4 side is interlocked with the lifting operation of the operation tool 10.
Presses the operated arm 18 on the swing arm 7 side in a direction against the urging of the urging spring 19.
Reference numeral 4B shown in FIGS. 2 to 8 is a stopper pin provided on the seat back 4 so as to restrict swinging of the crank arm 20 by contact with the crank arm 20.

That is, the linkage mechanism 9 includes a first mechanism portion 9A including an operated arm 18 and the like disposed on the seat cushion 3 side, and a crank arm 20 and a linkage rod 21 disposed on the seat back 4. The first mechanism unit 9A has a two-part structure with the second mechanism unit 9B, and is capable of pressing the operated arm 18 by the contact pin 20A with the connection of the seat back 4 to the swing arm 7. And the second mechanism portion 9B are linked to each other. When the rear seat 1 is assembled to the floor 2, the swing arm 7, the lock device 8, and the first mechanism 9 of the linkage mechanism 9 are connected to each other.
The seat cushion 3 equipped with the mechanism 9A and the like is first loaded into the vehicle and attached to the floor 2, and then the link mechanism 9 is mounted.
The seat back 4 equipped with the second mechanism portion 9B is carried into the vehicle and connected to the swing arm 7 on the seat cushion 3 side. As a result, the rear seat 1 which is bulky and heavy due to being assembled in a state where the reclining operation can be performed first is compared with a case where the rear seat 1 is carried into the vehicle.
Can be easily carried into the vehicle, and while the rear seat 1 is carried into the vehicle before the rear seat 1 is assembled into a reclining-operable state, the operating tool 10 and the seat cushion 10 on the seatback 4 side in the vehicle can be used. Since there is no need to separately perform a dedicated connection work for linking the lock device 8 on the third side, the rear seat assembling work in the vehicle can be simplified.

As shown in FIGS.
The end 11A on the center side is the support shaft 16 of the swing arm 7.
When the swing arm 7 is positioned in the reclining operation area, the outer peripheral end 11B is received and supported by a locking pin 13B provided on the base plate 13 (see FIGS. 3 to 5). In the state in which the swing arm 7 is swinging forward from the standing posture, the outer peripheral end 11B is separated from the locking pin 13B (see FIG. 6). Spiral spring 11
Is designed to urge the swing arm 7 to swing forward only in the reclining operation range.

With the above structure, in the reclining operation area, when the operating tool 10 disposed on the seat back 4 is pulled up, the swinging member 15 is in the tension release posture against the swinging bias of the biasing spring 19. And the movable plate 14 is positioned at the disengagement position [see FIG. 5], so that the seat back 4 is desired by the swing bias of the spiral spring 11 or a manual operation against the swing bias. When the lifting operation of the operating tool 10 is released at the stage where the seat back 4 is swung to the desired reclining posture, the swinging force of the urging spring 19 causes the seat back 4 to swing. Moving member 15
Swings in the direction of the tensioning posture, the movable plate 14 moves to the meshing position to mesh the occlusal teeth 14a with the occlusal teeth 13a of the base plate 13, and the rocking member 15 is cut into the stretching posture by the meshing. Instead, the movable plate 14 is prevented from moving from the meshing position (see FIGS. 3, 4, and 9A), so that the seat back 4 can be fixed in a desired reclining posture. I have.

Further, when the seat back 4 is switched from the standing posture to the forward leaning posture, it is possible to avoid a sudden switching of the seat back 4 to the forward leaning posture due to the action of the spiral spring 11, and the seat back 4 is moved forward. When the seat back 4 is switched to the standing posture, the seat back 4 can be switched to the standing posture only by applying an operating force against the weight of the seat back 4 to the seat back 4.

As shown in FIGS. 3 to 6 and FIG. 9, the upper edge 13A of the base plate 13 is located at a position facing the occlusal teeth 14a of the movable plate 14 in a state where the seat back 4 has been changed to the forward tilted posture. An engagement recess 13b shallower than the occlusal teeth 13a is formed, and the occlusal teeth 14a of the movable plate 14 are moved into the engagement recesses 13b of the base plate 13 by changing the posture of the seat back 4 to the forwardly inclined posture. At the time of reaching, the swinging member 15 swings in the direction of the tension posture by the swinging bias of the biasing spring 19, and the swinging moves the movable plate 14 in the meshing position direction to move the occlusal teeth 14a. Engagement recess 13b of base plate 13
The swing member 15 tends to be stretched between the swing fulcrum P3 of the swing member 15 and the end of the contact portion 14A of the movable plate 14 on the side of the concave portion 14B with the engagement. And the movable plate 14 is restrained from moving toward the disengagement position, so that the engagement between the engagement recess 13b of the base plate 13 and the occlusal teeth 14a of the movable plate 14 is maintained. [Fig. 6
And FIG. 9 (c)].

In other words, with the above configuration, the seat back 4 can be held in the forward leaning posture only by switching the seat back 4 from the standing posture to the forward leaning posture, so that the seat back 4 switched to the forward leaning posture can be held. Generation of abnormal noise due to rattling can be prevented. Moreover, the engagement recess 13 b is formed in the base plate 13.
By making a simple improvement simply to form the following, the base plate 13, the movable plate 14, the swing member 15, the biasing spring 19, and the like, which are the components of the lock device 8,
Since the holding mechanism 22 that holds the seat back 4 in the forwardly inclined posture can be configured, the configuration can be simplified and the manufacturing cost can be reduced.

The swing arm 7 on the seat cushion 3 side
6 and 8 when the seat back 4 is assembled to the vehicle.
As shown in (1), if the swing arm 7 is held by the holding mechanism 22 in the forwardly tilted position in advance, the engaging claw 7a of the swing arm 7 is engaged with the engaging hole 4a of the seat back 4 from the lower front. When positioning the seat back 4 with respect to the swing arm 7 in combination with the seat back 4,
The swing arm 7 can be prevented from swinging rearward and escaping from the seat back 4, and in the positioning state, the through hole 7 b of the swing arm 7 and the seat back 4 can be prevented.
The threaded portion 4b of the seat cushion 4 allows the connection between the swing arm 7 and the seat back 4 by the engagement of the connection bolt 12 from above. It is designed to improve the performance.

By the way, as shown in FIG. 6 and FIG. 9 (c), the state where the seat back 4 is held in the forward leaning posture by the holding mechanism 22 is defined by the swing fulcrum P3 of the swing member 15,
In this state, the swinging member 15 slightly bites between the contact portion 14A of the movable plate 14 and the end of the contact portion 14A on the side of the concave portion 14B.
A lock device 8 in which a line L4 connecting the contact point with the swing fulcrum P3 of the swing member 15 intersects a line L3 connecting the contact point with the swing fulcrum P2 of the movable plate 14 at an obtuse angle. (See (c) of FIG. 9), the swinging operation force is applied to the seatback 4 in the rearward direction, which is greater than the holding force of the holding mechanism 22, so that the seatback 4 swings. The pivot point P3 of the member 15 and the movable plate 14
Between the contact portion 14A and the end on the side of the concave portion 14B of the contact portion 14A, the swinging member 15 in a state of slightly biting slightly can be swung in the tension releasing direction,
Since the movable plate 14 can be moved to the disengagement position, the holding of the seat back 4 in the forward tilted position can be released.

In other words, the release of the holding of the seat back 4 in the forward leaning posture and the switching from the forward leaning posture to the standing posture are performed in series by a simple operation of swinging the seat back 4 in the forward leaning posture toward the rear. You can do it.

The engagement recess 13b of the base plate 13
Is formed so that the stepped portion a of the movable plate 14 at which the occlusal teeth 14a are hooked draws a smooth curve, whereby the seatback 4 held by the holding mechanism 22 in the forwardly inclined position is formed. When a swing operation force to the rear side larger than the holding force of the holding mechanism 22 is applied, the movable plate 14 gradually climbs on the stepped portion a and swings the swing member 15 in the direction of releasing the tension. The seat back 4 by the holding mechanism 22
Can be released smoothly in the forward leaning position.

[Other Embodiments] Other embodiments of the present invention will be listed below. The seat to which the present invention is applied may be a bench-type rear seat 1, a separate rear seat 1, or a passenger seat in which the entire seat back 4 is integrally reclined, or a floor 2
The seat back 4 is connected to a reclining device 5 such that the front and rear positions can be adjusted via a slide mechanism.
May be connected to the floor 2 or a slide mechanism via the through-hole so as to be able to swing back and forth. The reclining device 5 may be one in which the operating tool 10 and the operated arm 18 of the lock device 8 are linked by a link rod or a link wire, or the seat cushion 3 in which the operating tool 10 is on the fixed portion side. For example, it may be one that is deployed in such as. As the holding mechanism 22, the swing member 15 does not act in a stretched manner, but simply engages the engagement recess 13 b of the base plate 13 with the occlusal tooth 14 a of the movable plate 14 and swings the biasing spring 19. The movable plate 14 is biased.
May be configured to hold the seat back 4 in the forward tilted posture by suppressing the movement of the seat back 4 to the disengagement position side. A cam surface may be formed between the movable plate 14 and the swing member 15 so as to increase the pressing force for pressing the movable plate 14 against the base plate 13. As the holding mechanism 22, a bulging portion that moves over the movable plate 14 and swings immediately before the position facing the occlusal teeth 14 a of the movable plate 14 in a state where the seat back 4 of the base plate 13 has been changed to the forward leaning posture. The swelling portion and the movable plate 1 after being formed and swinging over the
4 prevents the movable plate 14 from moving to the disengagement position side by engaging the occlusal teeth 14a with the occlusal teeth 14a and oscillating biasing of the biasing spring 19, thereby holding the seat back 4 in the forward leaning posture. It may be configured as described above. For example, the holding mechanism 22 may be configured by interposing a detent mechanism between the swing arm 7 and the base plate 13. The configuration of the lock device 8 can be variously changed. For example, the movable plate 14 and the swing member 15 are disposed on the seat cushion 3 or the like on the fixed portion side, and the vicinity of the horizontal axis P1 of the seat back 4 is provided. The base plate 13 may be configured to rotate around the horizontal axis P1 with the forward and backward swing.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a configuration of a rear seat.

FIG. 2 is a side view showing the configuration of a rear seat.

FIG. 3 is a side view of a main part showing a configuration of the reclining device.

FIG. 4 is a side view of a main part showing a state where the seat back is fixed in a desired reclining posture;

FIG. 5 is a side view of an essential part showing a state in which the seat back is released from being fixed in a desired reclining posture;

FIG. 6 is a side view of a main part showing a state in which the seat back is held in a forward leaning posture.

FIG. 7 is a rear view of a main part showing a configuration of the reclining device and a connection configuration of the swing arm and the seat back.

FIG. 8 is a side view of the rear seat showing a connection configuration between the swing arm and the seat back.

9A is a side view of a main part of the locking device showing a seat back fixed state. FIG. 9B is a side view of a main part of the locking device showing a seat back fixed release state. Side view of main part shown

[Explanation of symbols]

 Reference Signs List 4 seat back 8 locking device 11 urging means 13 base plate 13a occlusal tooth 13b engaging concave portion 14 movable plate 14a occlusal tooth 15 swing member 19 urging spring 22 holding mechanism

Claims (3)

[Claims] 1. A seat reclining structure comprising: a locking device for fixing a seat back mounted to be able to swing back and forth in a desired posture; and urging means for urging the seat back to swing forward. The locking device and the urging means are configured to act in a reclining operation area on the rear side from a standing posture in a swing operation area of the seat back, and a holding mechanism for holding the seat back in a forwardly inclined posture is provided. A seat reclining structure in which the holding mechanism is configured to release the holding of the seat back in the forward tilted position by a swinging operation force on the seat back that is larger than the holding force. 2. The seat reclining structure according to claim 1, wherein the lock device includes the holding mechanism. 3. A base plate having a plurality of occlusal teeth formed at a position corresponding to the reclining operation area on a fixed portion side, and an occlusal tooth meshing with the occlusal tooth is provided on the seatback side. A movable plate whose position can be changed between an engagement position and an engagement release position, a tension position for preventing movement of the movable plate from the engagement position, and a tension release position for allowing movement to the engagement release position. A rocking member capable of rocking the rocking member over the base plate, and a biasing spring for biasing the rocking member in the direction of the tension to provide the locking device. The holding mechanism is formed by forming an engagement concave portion having a depth smaller than that of the occluded tooth at a position facing the occlusion tooth in a state where the posture is changed to the posture. Seat reclining structure.