JPH0712324B2 - Reclining adjuster with memory - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reclining adjuster for fixing a seat back of a seat of an automobile or the like by adjusting a seat back angle in a front-rear direction, and particularly, an inclination angle of the seat back. The present invention relates to a reclining adjuster with a memory that can be returned to the initially set inclination angle by simply rotating the seat back backward when the seat back is tilted forward after adjusting.

(Prior Art) For example, in order to maintain a stable driving posture, the front seat of an automobile is designed so that the inclination angle of the seat back can be arbitrarily adjusted and held at that angle. There is. By the way, in the case of a two-door vehicle or a three-door vehicle, it is necessary to tilt the seat back of the front seat forward every time an occupant of the rear seat gets in and out. Therefore, the front seat of such an automobile is automatically set to the adjusted original tilt angle when the seat back is tilted forward and then pivoted backward and raised again. A reclining adjuster with a memory is often used.

An example of such a conventional reclining adjuster with a memory will be described with reference to FIG. 1. In a cushion bracket 1 fixed to a side portion of a seat cushion, a back bracket 2 fixed to a side portion of a seat back is attached to a support shaft. It is supported by 3 so as to be rotatable in the front-rear direction. A sector gear 4 having a toothed portion 4a formed on the outer periphery thereof is fixed to the back bracket 2, and by engaging a lock gear 5 axially supported by the cushion bracket 1 with the sector gear 4, the back bracket 2 is cushioned. It is adapted to be locked to the bracket 1. Although not shown, the lock gear 5 is biased by a lock spring in a direction in which the lock gear 5 meshes with the sector gear 4. A shield plate 6 that shields a part of the tooth-shaped portion 4 a of the sector gear 4 is supported by the support shaft 3 by an oval support hole 7. The shielding plate 6 is provided with an engagement protrusion 8 that engages with the groove of the toothed portion 4a of the sector gear 4, and the engagement protrusion 8 is caused by the spring 9 to be engaged with the toothed portion 4a of the sector gear 4.
Is urged in the direction of engaging with.

In such a reclining adjuster, when setting the memory, first, the lock gear 5 is disengaged from the sector gear 4 by operating an operation lever (not shown), the tilt angle of the seat back is adjusted, and then the lock gear 5 is adjusted. Mesh with the sector gear 4. Then, the engaging protrusion 8 of the shield plate 6 is removed from the tooth-shaped portion 4a of the sector gear 4,
The shield plate 6 is rotated around the support shaft 3, and the engagement protrusion 8 is engaged again with the toothed portion 4a of the sector gear 4 at the position where the lower end of the shield plate 6 contacts the upper end of the lock gear 5.

After setting the memory in this way, disengaging the lock gear 5 from the sector gear 4 and tilting the seat back forward,
The sector gear 4 fixed to the back bracket 2 rotates around the support shaft 3 in the counterclockwise direction in the figure, and its tooth profile portion
The shield plate 6 that is engaged with the 4a by the engagement projection 8 rotates together in the counterclockwise direction. As a result, the shield plate 6 is interposed between the lock gear 5 and the sector gear 4,
Make sure that their engagement is prevented.

When the seat back is rotated rearward in this state, the back bracket 2, the sector gear 4, and the shield plate 6 rotate clockwise in the figure with the lock gear 5 in contact with the back surface of the shield plate 6. Then, when the lower end of the shielding plate 6 is disengaged from the upper end of the lock gear 5, the lock gear 5 engages with the sector gear 4 to lock the back bracket 2. This state is
Initially, it matches the condition when adjusting the tilt angle of the seat back. That is, the seat back is automatically set to the initially set inclination angle only by erecting the seat back that is tilted forward.

(Problems to be Solved by the Invention) By the way, in the case of such a reclining adjuster with a memory, the toothed portion 4a of the sector gear 4 located above the lock gear 5 is covered by the shielding plate 6 in a state where the memory is set. Therefore, the lock gear 5 and the sector gear 4 cannot be meshed with each other at that portion. That is, once the memory is set, it becomes impossible to adjust and fix the seat back at an inclined position ahead of the inclined position at that time. On the other hand, the front seat of a car and the like are not always used by the same person, and sometimes the driver changes. Therefore, it is often required to adjust the tilt position to the front of the stored tilt position. In such a case, in the conventional reclining adjuster with a memory as described above, it is necessary to adjust the seat back after releasing the memory. And when the original user uses it again,
It is necessary to readjust the seat back and set the memory again.

For this reason, as disclosed in, for example, Japanese Patent Laid-Open No. 58-29408, a shield plate is rotatably supported around a support shaft, and the shield plate is abutted against a lock gear. It is considered that the rotation is biased and the rotation is restricted at the memory position. According to such a reclining adjuster with a memory, it is possible to rotate the shielding plate even when the memory is set, so that it is possible to adjust the seat back to an inclined position in front of the memory position.

However, in the case of such a reclining adjuster, the shield plate is always in contact with the lock gear. Therefore, when the lock gear is engaged with and disengaged from the sector gear, there is a problem that abnormal noise is generated between the lock gear and the shield plate, or wear occurs between them to deteriorate durability thereof. Also, the rocking position of the lock gear is a position where it meshes with the sector gear, a position where it disengages with the sector gear but comes into contact with the shield plate to restrict its rotation, and a shield plate that is sufficiently separated from the sector gear and inserted between them. Since it is necessary to set the positions to 3 positions, there is also a problem that the structure becomes complicated and processing becomes difficult.

The present invention has been made in view of such a problem, and an object thereof is to be able to arbitrarily adjust the tilt angle of the seat back even after the memory is set, and to change the tilt position stored in the memory. Even after adjusting to another position, by tilting the seat back forward and then standing up again, a reclining adjuster with a memory that can be automatically set to the initial stored position is obtained.

Another object of the present invention is to provide a reclining adjuster with a memory that is easy to process and has high durability.

(Means for Solving the Problem) In order to achieve this object, in the present invention, a meshing prevention member that prevents meshing between the lock gear and the sector gear when the seat back is tilted forward, like the shielding plate in the above-described conventional art, It is rotatably supported around the support shaft and is urged to rotate in a direction away from the lock gear by urging means. When the engagement preventing member is rotated toward the lock gear side, when the lock gear is engaged with the sector gear, the engagement prevention member comes into contact with the tip of the lock gear to restrict further rotation toward the lock gear side. When is separated from the sector gear, it is rotated to a position opposed to the lock gear to prevent the meshing therebetween, and frictional force is received from the lock gear to be held at that position. The memory plate that stores the tilt angle of the seat back is attached to the meshing prevention member or the back bracket so that the position of the seat plate can be adjusted in the turning direction and the position of the seat plate can be fixed. When rotating backward from the state, the meshing prevention member is forcibly rotated via the memory plate. Further, a stopper means is provided between the back bracket and the meshing prevention member for restricting rotation of the prevention member in a direction away from the lock gear more than a predetermined amount.

(Operation) In the reclining adjuster configured as described above, since the engagement preventing member is urged to rotate in the direction away from the lock gear by the urging device, the rotation is normally restricted by the stopper device. Held in position. Its position is sufficiently far from the lock gear. Therefore, the entire tooth profile of the sector gear that meshes with the lock gear is exposed, and the tilt angle of the seat back can be adjusted to either the front or rear.

When storing the inclination angle of the seat back, the meshing prevention member is rotated to the lock gear side against the biasing force of the biasing means while the lock gear and the sector gear are meshed with each other. Then, at the position where the blocking member comes into contact with the tip of the lock gear, when the memory plate is attached to the blocking member, the memory plate is engaged with the engaging portion of the back bracket. Adjust the position of the memory plate so that it engages the blocking member when attached to the back bracket. After setting the memory plate, the blocking member is moved to the stopper position separated from the lock gear by the biasing means.

In this state, when the lock gear is disengaged from the sector gear and the seat back is tilted forward, the meshing prevention member fixedly held by the stopper bracket by the stopper means rotates together with the back bracket to reach the position facing the lock gear. As a result, the lock gear and the sector gear are prevented from meshing with each other. Since the lock gear is urged by the lock spring in the direction in which it engages with the sector gear, the blocking member receives a frictional force from the lock gear. Therefore, even if the seat back is rotated rearward from that state, the blocking member is held at that position for a while. However, when the seat back is rotated further rearward, the memory plate fixed to the back bracket or the mesh blocking member at the adjusted position engages with the mesh blocking member or the back bracket, and the blocking member acts as a lock gear. It is rotated against the frictional force of. Then, when the blocking member exceeds the end of the lock gear, the lock gear meshes with the sector gear. The position at that time is the position initially stored in memory.
In this way, the seat back is set to the original inclination angle only by rotating the seat back backward and standing it up.

(Example) Hereinafter, the present invention will be described in more detail with reference to the drawings.

2 to 9 show an embodiment of a reclining adjuster with a memory according to the present invention, FIG. 2 is a side view thereof, and FIG. 3 is an exploded perspective view thereof. Also,
4 to 6 are explanatory views of the operation.

As is clear from FIGS. 2 and 3, a back bracket 12 is rotatably supported on the cushion bracket 11 via a horizontal support shaft 13 fixed to the lower end portion thereof. The cushion bracket 11 and the back bracket 12 are fixed to the respective side portions of the seat cushion and the seat back (neither of which is shown), whereby the seat back is moved in the front-back direction (second
It is designed to be swingable in the left-right direction in the figure. A reclining spring (not shown) is provided between the support shaft 13 and the cushion bracket 11 for urging the back bracket 12, and thus the seat back, in a direction of rotating the seat back forward (to the left in FIG. 2). Has been.

At the lower end of the back bracket 12, a sector-shaped sector gear 14 centered on the support shaft 13 is caulked with pins 15, 15, ...
Is stuck by. The sector gear 14 is provided with a tooth-shaped portion 14a on the outer peripheral portion of the circular arc facing forward. On the other hand, a lever-shaped lock gear 16 is pivotally supported on the lower portion of the cushion bracket 11 so as to be swingable. A tooth profile 16a is formed on the rear surface (the right end surface in FIG. 2) of the upper end of the lock gear 16, and the tooth profile 16a is formed by the sector gear 14.
It is adapted to mesh with the tooth profile portion 14a. Further, a guide pin 16b protruding laterally is provided on the side surface of the lock gear 16, and the guide pin 16b is cam hole of a control lever 18 pivotally supported by a cushion bracket 11 by a shaft 17. It is adapted to engage with 18a. The engagement surface on the rear side (right side in FIG. 2) of the cam hole 18a is formed in an arcuate surface with the upper part as the center of the shaft 17 and in a lower part as an inclined surface inclined forward and downward. ing. A cam 18b is provided at the front of the control lever 18, and the cam 18b engages with an engaging portion formed on the front surface of the upper end of the lock gear 16 to push the lock gear 16 rearward. Is being done.

A rear end of the reclining operation lever 19 is rotatably supported on the support shaft 13. A long hole 19a is formed in the middle of the operation lever 19, and a pin 18c provided at the rear end of the control lever 18 is engaged with the long hole 19a. A lock spring 20 is stretched between the operation lever 19 and the cushion bracket 11,
The operation lever 19 is always urged toward a predetermined holding position below.

In the reclining adjuster configured as described above, when the operation lever 19 is pulled up against the lock spring 20, the pin 18c engaged with the elongated hole 19a is pulled up, and the control lever 18 moves around the shaft 17. It rotates counterclockwise in FIG. Then the control lever
The cam hole 18a of 18 moves upward, and the cam 18b separates from the lock gear 16. Then, the engagement surface at the lower rear part of the cam hole 18a engages with the guide pin 16b of the lock gear 16, whereby the guide pin 16b is pulled forward and the lock gear 16 separates from the sector gear 14. As a result, the back bracket 12 becomes rotatable with respect to the cushion bracket 11 together with the sector gear 14, and the seatback is rotated forward by the reclining spring.

When the operating lever 19 is released, the operating lever 19 is rotated downward by the lock spring 20, and the control lever 18 is rotated downward, that is, clockwise in FIG. As a result, the cam 18b engages with the lock gear 16 and pushes the lock gear 16 rearward. Thus, the tooth profile 16a of the lock gear 16
Engages with the toothed portion 14a of the sector gear 14. Since the rotation directions of the lock gear 16 and the sector gear 14 are different from each other, when they are engaged with each other, the rotation of the sector gear 14 is completely stopped. Therefore, the seat back is locked in that position.

In this way, the lock gear 16 is always biased by the lock spring 20 in the direction in which it engages with the toothed portion 14a of the sector gear 14, and the engagement with the sector gear 14 is disengaged by operating the operating lever 19.

In such a reclining adjuster, the support shaft
Further, a shield plate 21 is rotatably supported by 13.
The shield plate 21 has a fan shape centered on the support shaft 13, and as is clear from FIG. 3, an arcuate bent shield portion 21a is provided on the outer peripheral portion thereof. The shield 21a
Has an inner diameter slightly larger than the outer diameter of the sector gear 14, and when the lock plate 16 is engaged with the sector gear 14, the shield plate 21 is rotated forward, that is, toward the lock gear 16 side, the shield plate 21a. The front end of the abuts against the upper end of the lock gear 16, and further rotation is restricted. Further, when the lock gear 16 is separated from the sector gear 14, when the shield plate 21 is rotated forward, the shield plate 21a is inserted between the lock gear 16 and the sector gear 14, and covers the toothed portion 14a of the sector gear 14. Thus, the meshing with the toothed portion 16a of the lock gear 16 is prevented. That is, in this embodiment, the shielding plate 21 serves as a meshing prevention member.

The rear end of the shield portion 21a of the shield plate 21 is the center of the shield plate 21,
That is, it is bent toward the support shaft 13 side, thereby forming a small engaging protrusion 21b protruding inward. Further, a long hole 21c is formed in the vicinity of the outer periphery of the shield plate 21 in the vicinity of the engaging projection 21b, and the support pin 22a provided at the front end portion of the memory plate 22 is formed in the long hole 21c. Is to be inserted. In this way, the memory plate 22 is slidably supported along the elongated hole 21c of the shield plate 21 and swingably supported around the support pin 22a. Its memory plate 22
Has an arcuate outer periphery centered on the support shaft 13, and a large number of engagement grooves 22b, 22b, ... Engaging with the engagement protrusions 21b of the shield plate 21 are formed on the outer periphery. Has been done. Therefore, in the memory plate 22, by engaging the engagement protrusion 21b of the shield plate 21 with any of the engagement grooves 22b, the memory plate 22 can be placed at any position with respect to the rotation direction of the shield plate 21 that is the meshing prevention member. It is adapted to be locked to the shield plate 21. The length of the outer peripheral portion of the memory plate 22 is determined according to the normal adjustment angle range of the seat back.

The rear end portion of the memory plate 22 is provided with a stopper pin 22c that projects to the opposite side of the support pin 22a. The stopper pin 22c penetrates the elongated hole 12a formed in the back bracket 12 and projects to the outside thereof. A push knob (not shown) is attached to the outer end of the push knob. The long hole 12a of the back bracket 12 has a predetermined length in the front-rear direction, whereby the range in which the memory plate 22 can move with respect to the back bracket 12 is such that the stopper pin 22c has the long hole 12a. The stopper pin 22c is restricted within a predetermined range from the first position where it abuts the front end to the second position where the stopper pin 22c abuts the rear end of the elongated hole 12a. The vertical height of the elongated hole 12a is sufficient so that the memory plate 22 can swing around the support pin 22a and the engagement groove 22b can be disengaged from the engagement protrusion 21 of the shielding plate 21. It is supposed to be large.

Between the rear lower end of the memory plate 22 and the outer peripheral rear end of the shield plate 21, the memory plate 22 is urged to swing upward around the support pin 22a, and
A memory set spring 23 that pulls backward is stretched. The memory plate 22 is kept in a state of being engaged with the engagement protrusion 21b of the shield plate 21 by the memory set spring 23.

In addition, the rear lower end of the memory plate 22 and the back bracket
A shield plate return spring 24 that pulls the memory plate 22 rearward with respect to the back bracket 12 is stretched between the rear portion of the back plate 12 and the back portion 12. The return spring 24
The spring is a relatively weak spring for pulling back the shield plate 21 locked to the memory plate 22 to the rear. Thus, the return spring 24 constitutes an urging means for urging the shield plate 21, which is the meshing prevention member, to rotate in the direction away from the lock gear 16.

Next, the operation of this reclining adjuster with a memory will be described.

FIG. 4 is an enlarged view of a main part of FIG. 2, showing a state in which the seat back is appropriately adjusted and locked. In this state, the lock gear 16 is the sector gear.
The engaging projections 21b of the shield plate 21 are engaged with one of the engaging grooves 22b of the memory plate 22. The memory set spring 23 is in tension and the memory plate
A force is applied to 22 to pull up the rear end. Therefore, the memory plate 22 is reliably formed on the shield plate 21. The memory plate 22 is also pulled backward by the shield return spring 24, and its stopper pin 22c is located at a second rear position where it abuts against the rear end of the long hole 12a of the back bracket 12. Therefore, the shield plate 21 locked to the memory plate 22 is also in the most retracted position. That is, the elongated hole 12a of the back bracket 12 and the stopper pin 22c of the memory plate 22 constitute stopper means for restricting the further rearward rotation of the shield plate 21.

When setting the memory at the tilt angle of the seat back, first, the push knob attached to the stopper pin 22c is pushed to push down the memory plate 22. Then, the memory plate 22 swings around the support pin 22a in the clockwise direction in the drawing, and the engagement groove 22b of the memory plate 22 is disengaged from the engagement protrusion 21b of the shield plate 21. At this time,
A tensile force by the memory set spring 23 acts between the memory plate 22 and the shield plate 21,
The stopper pin 22c of the stopper 22 contacts the rear end of the elongated hole 12a of the back bracket 12 and is held there, so that the shield plate 21 rotates forward, that is, counterclockwise in the figure. Then, as shown in FIG. 5, it stops at the position where the front end of the shielding portion 21a of the shielding plate 21 contacts the upper end of the lock gear 16. During this time, the support pin 22a of the memory plate 22 relatively slides along the long hole 21c of the shield plate 21, so that the memory plate 22 is held in the same position.

Then, the push knob pushes the memory plate 22 forward, and the force of the memory set spring 23 and the shield return spring 24 is increased to the first position where the stopper pin 22c of the memory plate 22 abuts the front end of the elongated hole 12a of the back bracket 12. The memory plate 22 is moved against.
Then, when you release the push knob from the first position,
The memory plate 22 is swung upward by the memory set spring 23, and the engagement protrusion 21b of the shield plate 21 and the corresponding engagement groove 22b of the memory plate 22 engage with each other as shown in FIG. . At this time, the memory plate 2
2 is also pulled rearward by the memory set spring 23 and the return spring 24, but since the clearance between the engagement protrusion 21b of the shielding plate 21 and the memory plate 22 is small, before the memory plate 22 is pulled back alone. Is engaged.

In this way, the memory plate 22 is locked to the shield plate 21,
When the memory is set, as is apparent from FIG. 6, the shield return spring 24 is in a tensioned state, and the stopper pin 22c of the memory plate 22 is
Is located in front of the long hole 12a of the back bracket 12. Therefore, when the hand is released in this state, the memory plate 22 and the shielding plate 21 are moved by the return spring 24 to the second position where the stopper pin 22c of the memory plate 22 abuts the rear end of the elongated hole 12a of the back bracket 12. It is pulled back together. As a result, as shown in FIG. 7, the upper end of the lock gear 16 and the shield portion 21a of the shield plate 21.
A gap corresponding to the length of the long hole 12a of the back bracket 12 is formed between the front end of the sector gear 14 and
The tooth profile portion 14a of is exposed.

Thus, the work of setting the memory is completed. In this state, when the operating lever 19 is pulled up to separate the lock gear 16 from the sector gear 14, the back bracket 12 is rotated forward by the reclining spring, and the seat back is tilted forward. At this time, since the stopper pin 22c of the memory plate 22 is in contact with the rear end of the long hole 12a of the back bracket 12, the memory plate 22 is rotated forward as the back bracket 12 rotates forward, and the memory plate 22 The shield plate 21 locked to the plate 22 also rotates forward. As a result, as shown in FIG. 8, the shield portion 21a of the shield plate 21 is inserted between the lock gear 16 and the sector gear 14. When you release your hand from the operating lever 19, the lock spring 16 rotates the lock gear 16 toward the sector gear 14 side.
The shield plate (21) is brought into contact with the rear surface of the shield portion (2a), and is sandwiched between the sector gear (14).

From this state, when the seat back is pivoted rearward and the back bracket 12 is pivoted clockwise in the figure, a friction force is applied to the shield portion 21a of the shield plate 21 by the lock gear 16. Therefore, the shield plate 21 is held at the position as it is against the shield plate return spring 24 having a small spring force, and the memory plate 22 is locked to the shield plate 21.
Is also held in place. As a result, as shown in FIG. 9, the front end of the elongated hole 12a of the back bracket 12 contacts the stopper pin 22c of the memory plate 22.
That is, the long hole 12a that is the engaging portion of the back bracket 12
The memory plate 22 is engaged with the front end of the. Then, due to the engagement, the turning force of the seat back is transmitted to the shield plate 21 via the memory plate 22. Therefore, after that, a turning force larger than the friction holding force by the lock gear 16 is applied to the shield plate 21, and the memory plate 22 and the shield plate 21 are integrally rotated with the clockwise rotation of the back bracket 12. Move. At this time, the shield plate 21 has its shield
Since the frictional force is applied by the lock gear 16 slidingly contacting the 21a, the memory plate 22 is held at the first position with respect to the back bracket 12.

Then, at the moment when the shielding portion 21a of the shielding plate 21 is disengaged from the upper end of the lock gear 16, the lock gear 16 meshes with the sector gear 14 and locks the back bracket 12. The state at that time exactly matches the state shown in FIG. That is, the sixth
The inclination angle of the seat back in the state shown in the figure is stored. At this time, the frictional force of the lock gear 16 is removed from the shield plate 21 at the same time, so that the shield plate 21 and the memory plate 22 are rotated rearward by the shield plate return spring 24, and the state shown in FIG. Return to the position where rotation is restricted.

In the state shown in FIG. 7, in order to adjust the inclination angle of the seat back, the lock gear 16 is operated by operating the operation lever 19.
After removing the gear from the sector gear 14 and adjusting the seat back to an appropriate angle against the reclining spring, the hand may be released from the operation lever 19. When adjusting the seat back forward from the state shown in FIG. 7, the shield plate 21 also rotates counterclockwise as the back bracket 12 rotates counterclockwise, but in the state shown in FIG. Since a sufficiently large gap is formed between the shield portion 21a of the shield plate 21 and the upper end of the lock gear 16, the shield portion 21a prevents the meshing between the lock gear 16 and the sector gear 14 during normal adjustment. Never be. Normally, when adjusting the seat back, the inclination angle is not so greatly changed, so that the gap between the shielding plate 21 and the lock gear 16 at that time, and therefore the long hole 12a of the back bracket 12 is adjusted.
The length in the front-back direction may be relatively small.

When the seat back is adjusted in this state, the memory plate 22 and the shielding plate 21 are not affected at all, so that the set memory is maintained as it is. Therefore, even after the tilt angle of the seat back is adjusted, the seat back can be returned to the initial tilt angle stored by only tilting the seat back forward and then standing it up again.

In the above embodiment, the shield plate 21 is engaged with the engaging protrusion 21b.
And the engaging projections 21b are formed in the engaging grooves 2 of the memory plate 22.
Although it is adapted to engage with any one of 2b, on the contrary, a large number of engaging grooves are provided in the shielding plate 21, and the engaging protrusions provided on the memory plate 22 engage with any of the engaging grooves. You can also do so. For example, a large number of engagement grooves may be formed in the long hole 21c of the shield plate 21 so that the support pin 22a of the memory plate 22 can be engaged with and disengaged from the engagement groove by an external operation. Conceivable.

Further, in the above-mentioned embodiment, the memory plate 22 is attached to the shield plate 21 which is the meshing blocking member, but the memory plate 22 is mounted on the back bracket 12.
Since it controls the relative rotation between the shield plate 21 and the shield plate 21, it will be apparent that it can be attached to the back bracket 12 side.

(Effects of the Invention) As is apparent from the above description, according to the present invention, after the inclination angle of the seat back is adjusted, the engagement preventing member that prevents the engagement between the lock gear such as the shield plate and the sector gear is rotated forward. The position of the memory plate is adjusted by contacting the lock gear with the lock gear, and the positional relationship between the back bracket and the blocking member at that time is stored. Can be made. Since the blocking member is moved away from the lock gear again in such a memory state, the inclination angle of the seat back can be adjusted in either the front or rear direction even after the memory is set. Moreover, since the adjustment does not affect the memory, the seat back can be returned to the stored inclination angle at any time by tilting the seat back forward and then standing it up again.

Further, by thus separating the blocking member from the lock gear after setting the memory, even when the lock gear is swung to adjust the tilt angle of the seat back, the lock gear is in sliding contact with the blocking member. Is eliminated, wear during that time is prevented and durability is improved.

Further, since the lock gear may be swung between two positions, that is, a position where the lock gear is engaged with the sector gear and a position where the lock gear is out of the engagement, the setting is easy, and the durability of the cam and the like for that purpose is increased. In addition, the diameter of the blocking member such as the shielding plate can be reduced, and the overall size and weight can be reduced.

[Brief description of drawings]

FIG. 1 is a side view of a main part showing an example of a conventional reclining adjuster with a memory, FIG. 2 is a side view showing an embodiment of a reclining adjuster with a memory according to the present invention, and FIG. 3 is a reclining adjuster thereof. 4 and 9 are schematic side views of essential parts showing different operating states of the reclining adjuster. 11 …… Cushion bracket 12 …… Back bracket 12a …… Long hole (engagement part, stopper means) 13 …… Support shaft 14 …… Sector gear, 14a …… Tooth profile 16 …… Lock gear, 19 …… Operating lever 20… … Lock spring 21 …… Shield plate (mesh blocking member) 21a …… Shield, 21b …… Engagement protrusion 22 …… Memory plate 22a …… Support pin, 22b …… Engagement groove 22c …… Stopper pin (stopper means) ) 23 …… Memory set spring 24 …… Shield plate return spring (biasing means)

Claims (1)

[Claims] 1. A cushion bracket 11 fixed to a side portion of a seat cushion, and a bag fixed to a side portion of a seat back and rotatably supported in the front-rear direction by a support shaft 13 by the cushion bracket 11. The bracket 12, a sector gear 14 having a toothed portion 14a on an arcuate outer peripheral portion and fixed to the back bracket 12 so that the support shaft 13 is located at the center of the bracket 12, and is swingable on the cushion bracket 11. A lock gear 16 that is attached and locks the back bracket 12 with respect to the cushion bracket 11 by meshing with the toothed portion 14a of the sector gear 14, and a lock spring 20 that constantly urges the lock gear 16 in a direction that meshes with the sector gear 14. The lock gear 16 is swung in the opposite direction against the urging force of the lock spring 20. An operating lever 19 which can release the engagement between the Kugiya 16 and the sector gear 14, the rotatably supported around the support shaft 13, when rotated toward the lock gear 16 side, the lock gear 16
Is engaged with the sector gear 14, the further rotation is restricted by abutting the tip of the lock gear 16, and when the lock gear 16 is separated from the sector gear 14, it is rotated to a position facing the lock gear 16. The meshing prevention member 21 that moves to prevent meshing between the lock gear 16 and the sector gear 14, and receives frictional force from the lock gear 16 due to the urging force of the lock spring 20 to be held at that position, and the back bracket 12 Alternatively, the engagement prevention member 21
The position of the seat back is adjustable in the direction of rotation, and is fixed so that the seat back can be rotated rearward from the forward tilted state. By engaging with each other, the meshing prevention member 21 is moved to the lock gear 16
A memory plate 22 that rotates against the frictional force between the back plate 12, a biasing means 24 that biases the meshing blocking member 21 in a direction away from the lock gear 16, and the back bracket 12 and the meshing blocking member 21. A reclining adjuster with a memory, which is provided between the lock preventing means and the stopper means 12a, 22c for restricting the rotation of the engagement preventing member 21 in a direction away from the lock gear 16 more than a predetermined amount.