JPH0584120A - Reclining apparatus for sheet - Google Patents

Abstract

PURPOSE:To suppress backlash of a seat back and to simplify the constitution. CONSTITUTION:A main shaft 16 having an operating lever 52 on its one end is formed so as to have a partial lead screw 28 between a base plate 12 and an arm plate 14. In addition, a drive plate 32 having a nut 30 fitted in a lead screw 28 of the main shaft is movably provided in the shaft line direction of the main shaft 16. In addition, a pair of gear parts 44 and 46 of a lock mechanism 48 are provided by facing them to the arm plate 14 and a lock plate 36 so as to intermesh. Furthermore, the lock plate 36 as well as the drive plate 32 are movably provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seat in which a seat back is swingably supported with respect to a seat cushion and a tilt angle (reclining angle) of the seat back is arbitrarily set by locking a lock mechanism. Reclining device.

[0002]

2. Description of the Related Art For example, for a seat cushion,
A reclining device that adjusts an inclination angle (reclining angle) of a seat back by swinging the seat back in the front-rear direction is provided for a seat of a vehicle or the like.

The reclining device is constructed, for example, of a base plate attached to a seat cushion and an arm plate attached to a seat back. The arm plate is swingably connected to the base plate by a main shaft. There is. The reclining device includes, for example, a lock mechanism that interlocks with an operation member such as an operation handle, and the rocking of the seat back relative to the seat cushion is restricted by locking the lock mechanism. As a lock mechanism, for example, a combination of a lock groove formed in an arm plate and a lock claw that is formed so as to be engageable with the lock groove and that interlocks with an operating member is well known.

In such a reclining device, normally, the operating member and the lock mechanism are linked so as to be interlockable via a transmission means provided with various gears and links, etc., which are appropriately combined, and by the transmission means, The operation force of the operation member is transmitted and converted to the lock and lock-off operation of the lock mechanism.

[0005]

However, since the seat reclining device having the known structure is provided with the transmission means composed of various gears, links and the like, which are appropriately combined, an increase in the number of parts can be avoided. Absent. Therefore, the configuration becomes complicated, and the reclining device itself tends to be large, which is not preferable.

When various gears are meshed so as to be interlocked with each other, a so-called play is usually provided between the meshed gears in order to ensure smooth meshing and rotation of the gears. However, such play between gears is
The seat back is apt to rattle through the lock mechanism, which may cause the seat back to rattle.

Particularly, when there are many constituent members such as the transmission means, the play of the gears is increased and the gears are easily transmitted to the seat back, and the backlash of the seat back gives the seated person anxiety and discomfort. To reduce the comfort of the seated person,
Not preferable.

Therefore, for example, the operating force from the operating member is directly transmitted to the lock / lock-off operation of the lock mechanism without passing through a transmission means composed of a combination of gears and the like.
A configuration for converting is known.

In such a structure, the lock mechanism is
For example, the internal gear formed on the arm plate and the external gear formed on the lock plate so as to be able to mesh with the internal gear are formed. The lock plate is formed integrally with, for example, a nut that is screwed onto a lead screw formed on a main shaft between the base plate and the arm plate. External gear engagement, disengagement,
That is, the lock mechanism can be locked and locked off.

In such a structure, since the rotational operation force of the operation member directly acts on the lock mechanism via the main shaft,
The number of parts is reduced and the structure is not complicated.

However, in such a structure, the external gear is moved in the axial direction of the main shaft by the rotation operation of the operating member, and the internal teeth are moved under the strong tightening force of the lock plate toward the arm plate. Because it meshes with gears,
If the operating member is operated in a state where the crests of the external gear are displaced from the troughs of the internal gear, the external gear and the internal gear cannot be easily meshed with each other. If the operating member is strongly rotated in such a non-engaged state, the external gear and the internal gear may be damaged, which is not preferable for safety.

Further, in the lock mechanism composed of such an external gear and an internal gear, high accuracy is required for each gear. Therefore, as the configuration becomes complicated and the work becomes complicated,
Inevitability of workability is unavoidable.

Further, also in such external gears and internal gears, it is required to set the play for easy meshing and separation of the teeth. Therefore, the backlash in the lock mechanism is unavoidable, and the backlash in the seat back cannot be sufficiently prevented.

It is an object of the present invention to provide a seat reclining device capable of suppressing rattling of a seat back and simplifying the structure.

[0015]

In order to achieve this object, according to the present invention, a main shaft swingably connecting an arm plate to a base plate has a partial lead screw between the base plate and the arm plate. Is formed. And the drive plate that integrally has the nut that screws with the lead screw of the main shaft,
It is arranged so as to be movable in the axial direction of the main shaft between the base plate and the arm plate by the screw advancement and retraction of the nut with respect to the lead screw.

[0016] The crown gear tooth portion which constitutes the lock mechanism is
It is formed on the inner surface of the arm plate on the circumference around the main axis. In addition, a lock plate having teeth that can mesh with the teeth of the arm plate is arranged with the teeth facing the teeth of the arm plate, and moves in the axial direction of the main shaft as the drive plate moves. It is possible and non-rotatably attached to the base plate.

Then, due to the movement of the drive plate and the lock plate in the axial direction of the main shaft due to the rotational movement of the main shaft by the operating member directly attached to one end of the main shaft,
By engaging and disengaging the tooth portions of the arm plate and the tooth portions of the lock plate, it is possible to regulate the swing of the arm plate with respect to the base plate.

[0018]

Embodiments of the present invention will now be described in detail with reference to the drawings.

As shown in FIGS. 1 and 2, a seat reclining device 10 according to the present invention comprises a base plate 12 attached to the seat cushion side and an arm plate 14 attached to the seat back side. The main shaft 16 is swingably connected to the base plate.

The base plate 12 and the arm plate 14 are
For example, it is molded from synthetic resin or the like, and in addition to FIG.
As you can see, the insertion holes 18 and 2
0 has, for example, bosses 18a and 20a on its peripheral edge and is formed in the base plate and the arm plate, respectively.
Further, the main shaft 16 is formed, for example, integrally with a large-diameter locking piece 16a at one end.

For example, the main shaft is attached to the base plate 1 so that the arm plate 14 is arranged on the side of the locking piece of the main shaft 16.
2. Continuously insert into the insertion holes 18 and 20 of the arm plate. The base plate and the arm plate are connected by inserting the washer 22 and the locking member 24 into the extending end 16b of the main shaft.

As the locking member 24, for example, a spring pin that can lock the washer 22 by fitting it into an insertion hole 26 formed in advance at the extending end 16b of the main shaft can be used. However, the locking member 24 need only be locked to the washer 22 to restrict the movement of the washer and the base plate 12 in the detaching direction, and therefore the locking member 24 is not limited to the spring pin, and may be formed of, for example, an E ring. Good.

As shown in FIGS. 1 and 3, the main shaft 16 is formed with a lead screw 28 on the outer periphery of the corresponding portion between the base plate 12 and the arm plate 14. Then, a drive plate 32 integrally having a nut 30 capable of being screwed with the lead screw 28 in the central portion is arranged between the base plate 12 and the arm plate 14 around the main shaft 16. The nut 30 of the drive plate is formed, for example, on the arm plate side so as to project like a boss.

Then, for example, a lock plate 36 having an insertion hole 34 into which the nut 30 of the drive plate can be loosely inserted is arranged around the nut between the drive plate 32 and the arm plate 12. That is, the lock plate 36 is supported by the drive plate 32.

As can be seen from FIG. 3, the drive plate 32 and the lock plate 36 are formed, for example, with notches 38 and 40 having the same shape, and the notches can be continuously inserted. A stopper 42 is provided on the inner surface of the base plate 12 so as to project. The stopper 42 is, for example, an insertion hole.
It is provided at two places separated by a predetermined angle, for example 180 °, with respect to the center 18.

In such a structure, the drive plate 32 and the lock plate 36 cannot rotate with respect to the base plate 12 due to the engagement of the notches 38, 40 and the stopper 42. The nut 30 can be screwed into and out of the nut 28, that is, the drive plate and the lock plate can be moved in the axial direction of the main shaft.

Here, as shown in FIGS. 1 and 2, in the present invention, the arm plate 14 and the lock plate 36 are provided.
Further, a pair of tooth portions 44 and 46 capable of meshing with each other are provided so as to face each other, and the pair of tooth portions are formed as a locking mechanism 48 of the reclining device.

For example, the tooth portion 44 of the arm plate is formed on the inner surface, that is, the surface 14a facing the lock plate 36, in the shape of a crown gear centering on the insertion hole 20. Further, as shown in FIG. 3, the tooth portion 46 of the lock plate is formed in an arcuate shape corresponding to the tooth portion 44 of the arm plate on the surface 36a facing the arm plate 14.

In such a structure, the lock plate 36
However, since it is non-rotatably supported with respect to the base plate 12, when the tooth portion 44 of the arm plate and the tooth portion 46 of the lock plate are in mesh with each other, the lock mechanism 48 is in the locked state, and the arm plate swings with respect to the base plate. Is regulated.

By the movement of the drive plate 32 and the lock plate 36 in the axial direction along with the rotation of the main shaft 16, the lock plate moves in the direction away from the arm plate 14, and the tooth portion 46 of the lock plate moves. When separated from the tooth portion 44, the lock mechanism 48 enters the lock-off state. Then, the rocking restriction of the arm plate 14 with respect to the base plate 12 is released, and the tilt angle (reclining angle) of the seat back can be adjusted by the rocking of the arm plate.

Further, as shown in FIG. 1, the lock plate
36 is provided by the biasing means 50, for example an arm plate
It is biased away from 14, that is, toward the drive plate. As can be seen from FIG. 3 in addition to FIG. 1, as the biasing means 50, for example, the arm plate 14,
A compression coil spring wound around the main shaft 16 between the lock plates 36 can be used.

In such a structure, when the drive plate 32 moves in a direction away from the arm plate 14 due to the rotation of the main shaft 16, for example, the lock plate 36 is driven by the biasing force of the compression coil spring (biasing means) 50. Moves following the plate. When the drive plate 32 moves in the arm plate direction due to the rotation of the main shaft 16, the lock plate 36 is pressed against the biasing force of the compression coil spring 50 and moves in the arm plate direction together with the drive plate.

As shown in FIGS. 1 and 3, in the present invention, an operating member such as an operating handle 52 is directly attached to one end of the main shaft 16, and the main shaft is directly moved by rotating the operating handle. It is configured to be rotatable. One end of the main shaft 16 is formed to have, for example, a spline shaft-shaped protruding piece 54, and is an operation handle (operation member).
The operating handle is integrally and rotatably mounted on the main shaft by fitting the protruding pieces into the corresponding bearings 56 of 52.

In the embodiment, the operation handle 52 is shown as an example of the operation member, but it is sufficient if the main shaft 16 can be easily rotated, and the operation handle is not limited to the operation handle.
For example, the main shaft may be directly rotated by an operation lever or the like.

For example, a pair of tooth portions 4 as shown in FIG.
It is assumed that the meshed state of 4,46, that is, the locked state of the lock mechanism 48 is the initial state of the reclining device 10. When the operation handle 52 is rotated in the predetermined lock-off direction from such a state, the drive plate 32 is, for example, screwed by the rotation of the main shaft 16 integrated with the operation handle, that is, the lead screw 28. Direction, that is, a direction away from the arm plate 14 (rightward in the figure). At this time, the lock plate 32 is compressed by the compression coil spring 50.
It is pressed under the biasing force of and moves following the drive plate 32.

When the drive plate 32 moves to the right in the figure by a predetermined distance, the teeth 46 of the lock plate 36 separate from the teeth 44 of the arm plate, and the lock mechanism 48 locks, as shown in FIG. It is turned off. Then, the swing restriction of the arm plate 14 with respect to the base plate 12 is released, the arm plate becomes free, and the reclining angle of the seat back can be adjusted.

Further, when the operation handle 52 is rotated in the lock direction in the lock-off state of the lock mechanism 48 shown in FIG. 4, the drive plate 32, together with the lock plate 36, moves in the screw retracting direction of the nut 30, that is, the arm. Move in the plate direction (left in the figure). And the lock plate 36
Moves against the biasing force of the compression coil spring 50, and when the tooth portion 46 of the lock plate meshes with the tooth portion 44 of the arm plate as shown in FIG. The swing of the arm plate 14 is restricted, and the reclining angle of the seat back is set.

Here, as shown in FIGS. 2 and 3, in such a reclining device 10, an arm plate is used.
14, that is, the seat back is tilted forward (clockwise in the figure)
A biasing means 58 for biasing the subject is provided. As the biasing means 58, for example, a tension coil spring stretched between the locking piece 60 of the base plate and the locking piece 62 of the arm plate can be used.

In such a structure, the operation handle 52
When the lock mechanism 48 is locked off by the rotating operation of, the arm plate 14, that is, the seat back is automatically swung in the forward tilt direction under the biasing force of the tension coil spring (biasing means) 58. It That is, when adjusting the reclining angle in the forward leaning direction, it is sufficient to adjust the reclining angle of the seat back according to the preference while gradually releasing the stress on the seat back.

When adjusting the reclining angle in the backward tilt direction, the seat back is pressed backward against the biasing force of the tension coil spring, and the seat back is swung in the backward tilt direction. It is enough to adjust the reclining angle.

Therefore, when adjusting the reclining angle in any direction, the seat back can easily swing in the adjusting direction, and the work of adjusting the reclining angle is simplified.

Reference numeral 64 indicates a stopper provided on the base plate 12, and reference numeral 66 indicates a locking claw of the arm plate 12 which can be locked by the stopper of the base plate. The stopper 64 and the locking claw 66 are formed so as to prevent the arm plate 14 from excessively tilting forward with respect to the base plate 12, and the locking claw engaging the stopper causes the base plate, that is, the seat back to tilt forward. The position is set.

As described above, according to the seat reclining device 10 of the present invention, the main shaft 16 by the operation handle 52 is used.
Drive plate 32 by direct rotation operation of
It moves to the left and right with respect to the arm plate 14 in the axial direction of the main shaft together with the lock plate 36. Then, by the left and right movement of the lock plate 36 with respect to the arm plate 14 in the axial direction of the main shaft 16, the lock mechanism 48 is locked and locked off, that is, the swinging restriction and the restriction release of the arm plate 14 with respect to the base plate 12 are performed. ing.

That is, according to the present invention, the rotational operation force of the operation handle 52 is applied to the lock plate 36 via the main shaft 16 unlike the known configuration through the transmission means including various gear combinations and links. Since it directly transmits and acts, gears and links for transmitting means can be omitted. Therefore, the number of parts of the reclining device itself can be reduced, and the structure can be simplified and the reclining device can be sufficiently downsized.

Since the number of parts is reduced and the structure is simplified, the working process is simplified and the workability is improved.

Further, since there is no backlash due to the play of the gear for transmission, the backlash of the arm plate, that is, the seat back can be sufficiently suppressed, and the seated person is not anxious or uncomfortable. The comfort of the seated person is improved.

By pressing the lock plate 36 in the axial direction of the main shaft 16, the tooth portions of the opposing arm plates are
44, since the teeth 46 of the lock plate are intermeshed with each other,
It is possible to surely obtain a strong meshing without a gap or backlash between both tooth portions. Therefore, between the arm plate 14 and the lock plate 36, that is, the arm plate and the base plate 12
No rattling occurs between them, and also from this point, rattling of the seat back can be sufficiently suppressed, and the comfort of the seated person is improved.

Further, since the tooth portion 44 of the arm plate and the tooth portion 46 of the lock plate are pressed in the opposite directions, even if the lock plate 36 is pressed in the arm plate direction with both tooth portions displaced, For example, the rotation of the arm plate 14 along the inclination between the crests and the troughs of the teeth allows the deviation of the teeth to be easily absorbed. Therefore, the tooth portions 44, 46 are not damaged or damaged even under a large tightening force, and also in this respect, the strong locking of the lock mechanism 48 can be reliably obtained.

Further, the lock mechanism 48 includes the lock plate 36.
A plurality of teeth 46 within a predetermined width of the arm plate teeth 44
Since it is locked in the state of being meshed with, the meshing force between the pair of teeth increases. Therefore, the strong lock state of the lock mechanism 48 is sufficiently secured.

Here, in the embodiment, the drive plate 3 is formed by the combination of the notches 38 and 40 of the drive plate and the lock plate and the stopper 42 of the base plate.
2. The base plate 36 is held against the rotation of the main shaft 16. However, drive plate 32, base plate 36
Is sufficient if it can be held against the rotation of the main shaft 16,
The configuration is not limited to this, and the drive plate and the lock plate may be supported by other means, for example.

However, the stopper of the base plate
Insert the 42 into the notches 38 and 40 and engage them to
32, in the structure that supports the lock plate 36 non-rotatably,
Despite the simple configuration, the rotation of the drive plate 32 is prevented from rotating with the rotation of the main shaft 16, the nut 30 of the drive plate is screwed in and out of the lead screw 28 of the main shaft, and the arm plate 14 is rocked with respect to the base plate 12. Movement can be reliably stopped. Therefore, smooth lock and lock-off of the arm plates, the tooth portions 44 and 46 of the lock plate, that is, the lock mechanism 48 can be obtained, and the rattling of the arm plate with respect to the unit base 12 can be sufficiently prevented.

Further, in the embodiment, the stoppers 42 are provided at two locations on the base plate 12, but the invention is not limited to this. For example, the stoppers may be provided at one location. However, if the stoppers 42 are provided at at least two places, the strength of the stoppers is increased, and therefore it is possible to sufficiently resist an excessive load acting from the arm plate 14.

The stopper 42 is not limited to the illustrated shape, and a stopper having another shape may be provided on the base plate 12.

Further, the notches 38 and 40 of the drive plate and the lock plate are not limited to the shapes shown in the drawings, as long as the notches 38 and 40 can be inserted and engaged with the stopper 42 of the base plate. It should be noted that the notch also includes an insertion hole through which the stopper 42 of the base plate can be inserted and engaged.

In the embodiment, the crown gear tooth portion 44 of the arm plate is formed on the circumference around the insertion hole 20, and the tooth portion 46 of the lock plate is formed in a corresponding arc shape. Has been formed. However, the pair of teeth 44, 46 of the arm plate and the lock plate are
The invention is not limited to this as long as they can be engaged with each other and face each other, and the pair of teeth of the arm plate and the lock plate may be formed by the claw-shaped teeth that can be engaged with each other from the facing direction. Good.

However, if the tooth portion 44 of the arm plate is formed in the shape of a crown gear and the tooth portion 46 of the lock plate is formed in a shape corresponding to the tooth portion 44 as in the embodiment, the distance between the both tooth portions is reduced. The mating of is sure and easy. Further, the strong engagement between the two tooth portions 44 and 46 can be easily performed, and the rattling at the time of engagement can be reliably prevented.From this point also, the tooth portion is prevented from being damaged or damaged and the seated person's comfort is improved. Further improve the sex.

In the above embodiment, the reclining device 10 is illustrated as a one-sided lock type structure, but the invention is not limited to this and the present invention can be applied to a two-sided lock type reclining device 110.

As shown in FIG. 5, in the double-sided lock type reclining device 110, the drive side (left side in the figure) is used.
The main shaft 16 of the and the main shaft 116 of the driven side (right side in the figure)
They are integrally rotatably connected, and the left and right drive plates 32, 132 are synchronously movable by the rotation operation of the operation handle 52.

A reclining device with locks on both sides
Since the structure of the reclining device 10 of the above-described embodiment is used as the driving side of 110, it will not be described in detail here.

As shown in FIG. 6 in addition to FIG. 5,
Driven side base plate 112, arm plate 114
Like the drive side, is attached to the main shaft 116 through which the insertion holes 118 and 120 are continuously inserted, and the insertion end 126b of the extension end 116b of the main shaft 116 is inserted through the main shaft locking piece 116a and the washer 122.
It is locked and pivotally attached by a spring pin 124 fitted in.

For example, the extension end 16 of the drive side main shaft 16
The b is formed to extend in the direction of the other side, and is inserted into the hollow portion of the extending end 116b of the main shaft 116 on the driven side. And
The left and right main shafts are linked so as to be interlocked by the insertion hole 68 of the extended end 116b of the driven side main shaft and the spring pin 72 continuously fitted in the notch 70 of the extended end 116b of the drive side main shaft. There is.

Like the drive side lock mechanism 48, the driven side lock mechanism 148 includes a crown gear tooth portion 144 of the arm plate 114 and a tooth portion 146 of the lock plate 136 opposed to the tooth portion 144. It is formed by a combination.

Here, as shown in FIGS. 5 and 6, the lock plate 136 on the driven side is, for example, between the drive plate 132 in which the lead screw 128 of the main shaft 116 is screwed with the nut 130 and the base plate 112. , Tooth 146
Is arranged so as to face the tooth portion 144 of the arm plate. The drive plate 132 has 14 teeth on the lock plate.
It is formed smaller than the inner diameter of 6. The lead screw 128 of the main shaft 116 is formed as a reverse screw to the lead screw 28 of the main shaft on the drive side.

The biasing means 150 is a base plate.
It is formed as a leaf spring interposed between the lock plate 136 and the lock plate 136 to bias the lock plate in the drive plate direction, that is, in the meshing direction of the tooth portion 144 of the arm plate and the tooth portion 146 of the lock plate.

The drive plate 132 and the lock plate 136 are formed with notches 138 and 140, respectively, into which the stopper 142 protruding from the inner surface of the base plate 112 can be inserted and engaged. The engagement between the stopper 142 and the notches 138, 140 causes the lead screw of the main shaft to
Threading the nut 132 against the 128, ensuring the unwinding, and
The lock plate 136 is prevented from rotating with respect to the base plate 112.

Further, as shown in FIG. 6, the base plate
A biasing means 158 composed of a tension coil spring is stretched between the arm plate 114 and the arm plate 114, and the arm plate is biased in the forward tilt direction of the seat back.

As can be seen from FIG. 5,
In the reclining device 110 of the present invention, when the tooth portion 144 of the arm plate and the tooth portion 146 of the lock plate are engaged with each other, that is, when the lock mechanism 148 is locked, the drive plate 132 is slightly separated from the lock plate 136 from the arm plate. It is configured to wait.
That is, when the lock mechanism 148 is locked, the gap 74 is formed between the drive pillate 132 and the lock plate 136.

Then, in such a state, the lock plate 1 is biased by the biasing force of the leaf spring (biasing means) 150.
36 is pressed to the right in the figure, and the teeth 144 on the arm plate
The teeth 146 of the lock plate are meshed with each other.

For example, the lock mechanism 4 as shown in FIG.
When the operation handle 52 is rotated in the lock-off direction in the locked state of 8,148, the drive plates 32, 132 move inward (toward the center in the figure). At this time,
The lock plate 36 on the drive side moves following the drive plate 32 under the biasing force of the compression coil spring 50, while the lock plate 136 on the driven side has a gap.
Drive plate movement on 74, lock plate
Moved with a delay from 36. And drive plate
After 132 comes into contact with the lock plate 136, the lock plate is pressed inward by the drive plate and moved in the lock-off direction of the lock mechanism 148 against the biasing force of the leaf spring 150.

If the operating handle 52 is rotated in the locking direction while the lock mechanisms 48 and 148 are in the lock-off state, the drive-side lock plate 36 becomes a biasing force of the compression coil spring 50 as the drive plate 32 moves. Against the locking mechanism 48, the pair of teeth 4
The lock mechanism 48 is locked by the engagement between the four and the four.

When the operating handle 52 is rotated in the locking direction, the drive plate 132 moves in the arm plate direction (rightward in the figure). Then the lock plate
136 is pressed in the drive plate direction by the biasing force of the leaf spring 150 and moved in the lock direction of the lock mechanism 148. Then, when the drive plate 132 moves by a predetermined distance and the tooth 146 of the lock plate meshes with the tooth 144 of the arm plate, the locking mechanism 148 is locked by the biasing force of the leaf spring 150, and the drive plate 132 is locked. Moves further toward the arm plate, and a gap 74 is formed between the lock plate 136 and the drive plate 132.

As described above, according to the double-sided lock type reclining device 110 of the present invention, the drive side lock plate 36 moves almost integrally with the drive plate 32, while the driven side lock plate 136. Moves in the lock-off direction with a slight delay from the movement of the drive plate 132. That is, the lock mechanism on the driven side
Since the timing of lock and lock-off of 148 is deviated from the lock mechanism 48 on the drive side, even if there is a rotational angular error between the spindles 16 and 116 and the drive plates 32 and 132 are misaligned, the lock mechanism The positional deviation between the drive plates can be absorbed by the deviation of the timing.

Therefore, even if a rotational angular error occurs between the main shafts 16 and 116, the lock and lock-off operations of the left and right locking mechanisms 48 and 148 are not impaired, and the pair of tooth portions 44 and 46 and the pair of tooth portions 144 and 146 are not damaged. A strong meshing can be secured, and play of the left and right lock mechanisms can be sufficiently prevented.

According to this structure, even in the double-sided lock type reclining device 110, the drive side lock plate 36 is directly pressed by the drive plate 32 and the lock mechanism 48 is locked, so that the lock mechanism 48 is locked. The firm locked state of can be surely obtained.

Although the present invention is optimal as a reclining device for automobile seats, the present invention is not limited to this and can be applied as a reclining device for various other seats such as trains, airplanes, and ships.

The above-mentioned embodiments are for explaining the present invention and do not limit the present invention in any way.
It goes without saying that the present invention includes all those which are modified or modified within the technical scope of the present invention.

[0077]

As described above, according to the seat reclining device of the present invention, the rotational operation force of the operating handle is directly transmitted to the drive plate via the main shaft, and the rotational direction of the main shaft is increased in the axial direction. The lock mechanism is locked and locked by the movement of the drive plate. Therefore, the number of parts of the reclining device itself can be reduced, and the structure can be simplified and the reclining device can be sufficiently downsized.

Since the work process is simplified by reducing the number of parts and simplifying the structure, workability is improved.

Furthermore, since the teeth of the arm plate and the teeth of the lock plate which face each other are meshed with each other by pressing the lock plate in the axial direction of the main shaft, no gap or rattling occurs between the two teeth. A strong mesh can be reliably obtained. Therefore, looseness between the arm plate and the lock plate, that is, the backlash of the seat back can be reliably prevented, and the comfort of the seated person is improved without giving the seated person anxiety and discomfort.

Further, since the tooth portion of the arm plate and the tooth portion of the lock plate are pressed in the opposite directions, even if the lock plate is pushed in the arm plate direction with both tooth portions displaced, for example, By rotating the arm plate along the inclination between the peaks and valleys of the toothed portion, the shift of the tooth portion can be easily absorbed. Therefore, both tooth portions are not damaged or damaged even under a large tightening force, and also in this respect, a strong lock of the lock mechanism can be reliably obtained.

If a large number of teeth of the lock plate are formed over a predetermined range, the meshing force between the pair of teeth increases. Therefore, the strong lock state of the lock mechanism is sufficiently secured.

Further, in the structure in which the stopper provided on the base plate is inserted into and engaged with the cutouts of the drive plate and the lock plate, the rotation of the drive plate is prevented due to the rotation of the main shaft, and the main shaft is rotated despite the simple structure. It is possible to reliably prevent the nut of the drive plate from moving forward and backward with respect to the lead screw and the swing of the arm plate with respect to the base plate.

Therefore, by the movement of the drive plate in the axial direction of the main shaft, a smooth lock and lock-off operation of the lock mechanism can be obtained, and rattling of the arm plate with respect to the unit base can be sufficiently prevented.

Further, if the stoppers are provided at at least two places separated from each other by a predetermined distance, the strength of the stoppers is increased, so that it is possible to sufficiently resist an excessive load acting from the arm plate.

By disposing the lock mechanism on the left and right sides, a double-sided lock type reclining device can be constructed. If the lock and lock-off timings of the left and right lock mechanisms are shifted, a rotational angle error occurs between the left and right spindles, and even if the left and right drive plates are misaligned, the timing of the left and right lock mechanisms will change. Due to the displacement, the positional displacement between the drive plates can be absorbed.

Therefore, even if a rotational angular error occurs between the left and right main shafts, the lock and lock-off operations of the left and right lock mechanisms are not impaired, and a strong meshing between the teeth of the left and right lock mechanisms is secured. It is possible to prevent looseness of the left and right locking mechanisms.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a seat reclining device according to the present invention in a locked state of a lock mechanism.

FIG. 2 is a schematic front view of a seat reclining device.

FIG. 3 is an exploded perspective view of a seat reclining device.

FIG. 4 is a vertical cross-sectional view of the seat reclining device in the lock-off state of the lock mechanism.

FIG. 5 is a vertical sectional view of a seat reclining device according to another embodiment of the present invention.

FIG. 6 is an exploded perspective view of a driven side of the seat reclining device.

[Explanation of symbols]

 10,110 Seat reclining device 12,112 Base plate 14,114 Arm plate 16,116 Spindle 28,128 Lead screw 30,130 Nut 32,132 Drive plate 36,136 Lock plate 38,138 Notch 40,140 Notch 42,142 Stopper 44,144 Arm plate tooth 46,146 Lock plate tooth 48,148 Locking mechanism 50,150 Biasing means 52 Operation member (operation handle)

Claims (6)

[Claims] 1. A nut for connecting a arm plate to a base plate so as to be swingable is formed with a partial lead screw between the base plate and the arm plate, and a nut screwed to the lead screw of the main shaft. A drive plate that integrally has a lock plate is installed between the base plate and the arm plate so that it can move in the axial direction of the main shaft when the nut is threaded and retracted with respect to the lead screw. The teeth are formed on the inner surface of the arm plate on the circumference centered on the main axis, and the lock plate having teeth that can mesh with the teeth of the arm plate attaches the teeth to the teeth of the arm plate. Arranged facing each other, as the drive plate moves,
Drive plate and lock in the axial direction of the main shaft due to the rotational movement of the main shaft by an operating member that is movable in the axial direction of the main shaft but is not rotatable with respect to the base plate and is directly attached to one end of the main shaft. By moving the plate, the teeth of the arm plate and the teeth of the lock plate are engaged and disengaged,
A seat reclining device that regulates the swing of the arm plate relative to the base plate. 2. The seat reclining device according to claim 1, wherein a plurality of teeth of the lock plate are formed over a predetermined range. 3. A drive plate and a lock plate,
The seat reclining according to claim 1 or 2, wherein a stopper that is formed with a partial notch and that can continuously pass through the notches of the drive plate and the lock plate is provided on the inner surface of the base plate. apparatus. 4. The seat reclining device according to claim 3, wherein the stoppers are provided at at least two positions separated by equal intervals. 5. A lock mechanism is disposed on each of the left and right sides of the seat, a lead screw of a main shaft separated from the left and right sides of the seat is formed as a reverse screw, and a drive plate and a lock plate are disposed on each of the left and right sides. By connecting the main shafts of the seats so that they can be interlocked, the rotational movement of the main shafts by the operating member mounted on one side is transmitted to the other side, and the locking mechanism on the left and right sides of the seat can be locked and locked off integrally. The seat reclining device according to any one of claims 1 to 4. 6. The left or right lock plate is disposed between the arm plate and the drive plate,
The teeth of the arm plate and the teeth of the lock plate are engaged with each other under the force of tightening the drive plate toward the arm plate, and the other lock plate is arranged between the drive plate and the base plate. Under the biasing force in the plate direction, the teeth of the arm plate and the teeth of the lock plate mesh with each other.When the lock mechanism is locked, the other drive plate moves away from the lock plate to the arm plate. The seat reclining device according to claim 5, wherein the seat reclining device performs the lock-off operation after the lock-off operation of the one lock mechanism caused by the lock-off operation of the operation member in a standby state.