JPH0644449U - Vehicle seat - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] To provide an emergency locking device that locks the tilting of the seat back on the free hinge side in an emergency when a large impact load is applied to the vehicle body to improve the ease of assembly. [Structure] When a large impact load is applied to the seat backs S and B, since the S and B on the emergency locking device S ₂ side are not locked, the torsional displacement generated in the arm 30 via the seat back frames B and F Thereby, the arm 30 rotates rearward while deforming the operation limiting pin 70. When the left end of the elongated hole 30b of the arm 30 is rotated until it abuts on the connecting rod attachment shaft 22, the lock limiting plate 50 moves upward via the upper part spin 23 and the pair of lock limiting pins 24. The engaging surface 60a of the engaging member 60 is disengaged from the lock restricting surface 50a of the lock restricting plate 50, and the tooth portion 40a of the lower tooth 40 that rotates counterclockwise by the tension spring 41 becomes the tooth portion 20a of the upper part 20. Mesh. As a result, the S / B on the emergency device S ₂ side is securely locked.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vehicle seat having a so-called cantilever seat reclining device in which a seat reclining device is arranged only on one side of a seat and the other side is a free hinge.

[0002]

[Prior art]

 Generally, as a seat reclining device for adjusting the tilt angle of the seat back of a vehicle seat, the tilt angle of the seat back is kept constant by the engagement between the teeth of the upper part and the teeth of the lower tooth. The latch-type stepped adjustment device that can adjust the tilting angle of the seat back by changing the meshing position of the upper part of the seat back to the tooth part, the meshing of the gears arranged on the pivot part of the seat back and the seat cushion. The Taumel mechanical stepless adjustment device, which keeps the tilt angle of the seat back constant by rotating the gear, and finely adjusts the tilt angle of the seat back by rotating the gears, and a device that uses these two devices together are known. There is.

By the way, in a vehicle seat of a cantilever seat reclining device in which the seat reclining device described above is provided only on one side of the seat and the other side is a free hinge, a large impact load is applied to the vehicle body due to a vehicle collision or the like. There is a risk that the seat back will not be able to be held sufficiently when the action of the.

That is, in an emergency such as when the vehicle is rear-end hit, a large impact load is applied to the seat back in a backward direction due to the occupant sitting on the front seat being pressed against the front seat back. In such a case, one side of the seat back is firmly locked by the seat reclining device, but the other side is not locked by free hinge, so that the seat back on the other side is not locked on the seat back on the one side. On the other hand, it is easy to move backward. If this amount of displacement becomes too large, there is a risk that the seat back cannot be held sufficiently.

Therefore, as a means for solving the above-mentioned problems, a vehicle provided with a seat reclining device on both sides of the seat and a so-called double-end seat reclining device in which these devices are linked by a connecting rod or a connecting wire. Sheet is used.

[0006]

[Problems to be solved by the device]

 However, in the above-described conventional vehicle seat equipped with the double-sided seat reclining device, since the seat back is firmly supported on both sides, the seat provided on one side of the seat has excellent load bearing performance. When operating the operating lever of the reclining device to adjust the seat back to the desired tilt angle, operate the operating lever to accurately transmit the operating force of the operating lever to the seat reclining device on the other side. In addition to requiring a large amount of force, there were problems such as poor synchronization during operation and the possibility of seat back position displacement.

Further, since the structure of the double-sided seat reclining device is required to have high accuracy and the number of parts is increased, there is a problem that the cost is considerably increased.

Therefore, in order to solve the above-mentioned problems of the prior art, the present applicant has a vehicle seat equipped with an emergency locking device that can lock the tilting of the seat back on the other side only in an emergency when a large impact load is applied to the vehicle body. Has been applied for in Japanese Patent Application No. 3-201336.

The present invention is a further improvement of the vehicle seat according to the above-mentioned application. The object is to prevent the emergency lock device from locking before the emergency lock device is assembled to the vehicle seat. The purpose of the present invention is to provide a vehicle seat with a good assembling property.

[0010]

To achieve the above object, in a vehicle seat according to claim 1 of the present invention, a seat reclining device for adjusting a tilt angle of a seat back is provided on one side of the seat, and a seat reclining device is provided on the other side. A vehicle seat in which an emergency lock device for locking tilting of the seat back when a load of a predetermined amount or more is applied to the back is arranged, wherein the emergency lock device is a base plate attached to the other side of the seat cushion. And an arm part which has a tooth part and an arm which is displaceably attached to the other part of the seat back and is coaxially mounted on the seat part, and which is meshable with the tooth part of the upper part part. Has a lower tooth that is biased toward the upper part side, and moves to the tooth side and the opposite tooth side of the upper part. A lock limiting plate having an effective lock limiting surface, and an engaging member having an engaging surface for engaging the lock limiting surface of the lock limiting plate is attached to the lower tooth. And the arm are connected by an operation limiting member.

The vehicle seat according to claim 2 is characterized in that the operation limiting member is constituted by a pin made of synthetic resin.

The vehicle seat according to claim 3 is characterized in that the operation limiting member is constituted by a cut-and-raised portion formed on the arm.

The vehicle seat according to claim 4 is characterized in that the operation limiting member is constituted by a leaf spring provided on the arm.

Further, the vehicle seat according to claim 5 is characterized in that the operation limiting member is a detachable connecting pin.

[0015]

[Action]

 According to this invention, the other side of the seat is usually a free hinge, but in an emergency when a large impact load is applied to the vehicle, the arm is displaced with respect to the upper part and the lock limiting plate is moved upward. Move, the teeth of the lower tooth mesh with the teeth of the upper part. As a result, the seat back on the free hinge side can be reliably locked only in an emergency, and the seat back can be firmly locked together with the locking effect on the seat reclining device side.

Further, since the cantilever seat reclining device is normally used, it is possible to eliminate the synchronization failure and the phase shift of the seat back at the time of operation, which are problems in the conventional two-end seat reclining device. The number of parts and the number of assembly steps can be significantly reduced, and the weight and cost can be reduced.

Further, even before the emergency locking device is attached to the seat, the arm is integrally connected to the upper part by the operation limiting member, and the lock limiting plate does not move. Therefore, the tooth portion of the upper part and the tooth portion of the lower tooth can be prevented from meshing with each other, and the seat back can be prevented from being locked. As a result, the emergency locking device can be easily attached to the seat, and the assemblability can be improved.

[0018]

【Example】

 The present invention will be described below based on the embodiments shown in the drawings.

1 to 6 relate to a first embodiment of the present invention, FIG. 1 is a schematic perspective view of a vehicle seat, FIG. 2 is a front view of an emergency locking device, and FIG. 3 is III-- of FIG. III Cross-sectional explanatory view taken in the direction of the arrow, FIG. 4 is an exploded perspective view of the essential parts of FIG. 2, FIG. 5 is an operation explanatory view of the emergency locking device when unlocking, and FIG. 6 is an operation explanatory diagram of the emergency locking device when locking. Is.

In the figure, S is a vehicle seat, and a seat reclining device S ₁ for adjusting the tilt angle of the seat back S / B is provided on one side of the seat, and a seat reclining device S ₁ on the other side has a predetermined amount or more. An emergency lock device S ₂ is arranged to lock the tilting of the seat backs S and B when a load is applied.

In the present invention, in particular, the emergency locking device S ₂ is displaced with respect to the upper part 20 having the tooth portion 20a on the base plate 10 attached to the other side of the seat cushions S and C and the upper part 20. An arm 30 which is attached to the other side of the seat backs S and B is coaxially attached to the seat back S and B, and a tooth portion 40a capable of meshing with the tooth portion 20a of the upper portion 20 is provided. The lower tooth 40 urged by 41 is attached to the shaft, and a lock limiting plate 50 having a lock limiting surface 50a movable on the tooth side and the opposite tooth side of the upper part 20 is attached to the upper part 20. An engaging member 60 having an engaging surface 60a that engages with the lock limiting surface 50a of the lock limiting plate 50 is attached to the lower tooth 40. Mounting, and further is joined by upper tooth 20 and the arm 30 of the operation restricting member 70.

Further, the structure of the first embodiment of the present invention will be described in detail.

The vehicle seat S is a well-known device such as the latch type stepped adjusting device, the Taumel mechanism stepless adjusting device, or a device that uses a combination of the two types described above as a conventional technique on one side of the seat cushions S and C. The seat reclining device S ₁ and the emergency locking device S ₂ are arranged on the other side, and these devices S ₁ and S ₂ are connected by a connecting rod 80. Then, by operating the operation lever 81 of the seat reclining device S _1, the seat backs S and B can be adjusted to a desired tilt angle with respect to the seat cushions S and C.

In FIG. 1, C and F are seat cushion frames, and B and F are seat back frames.

The emergency lock device S ₂ includes a base plate 10, an upper part 20, an arm 30, a lower tooth 40, a lock limiting plate 50, an engaging member 60, and an operation limiting member 70.

The base plate 10 is fixed to the side portions of the seat cushions S and C, and the upper part mounting shaft 21, the lower tooth mounting shaft 42, and the holder plate mounting shaft 91 are planted on the surface thereof, respectively. An arcuate elongated hole 10a is formed with the axis of the tooth mounting shaft 21 as the center.

The upper part 20 has a substantially central portion rotatably attached to an upper part mounting shaft 21, and an arcuate tooth portion around the shaft center of the upper part mounting shaft 21 at its lower edge. 20a is formed. A connecting rod mounting shaft 22 is planted on the upper part of the upper part 20. The connecting rod mounting shaft 22 is inserted into the elongated hole 10a of the base plate 10 and protrudes from the back surface of the base plate 10. A mounting plate 82 having a connecting rod 80 fixed thereto is attached to the projecting portion 22a of the connecting rod mounting shaft 22 and the projecting portion 21a of the upper part mounting shaft 21.

Further, an upper part spin 23 is planted in the lower part of the upper part spin 20, and a pair of arc-shaped arcs centering on the shaft center of the upper part mount mounting shaft 21 are arranged on both left and right sides of the upper part spin 23. The long hole 20b is formed. A lock limiting pin 24 is fitted into each of the elongated holes 20b. Further, an operation limiting pin 70 made of synthetic resin as an operation limiting member is fitted into the upper part 20.

The lock limiting plate 50 is disposed so as to overlap with the upper part 20, and the upper part mounting shaft 21 is inserted into a long hole 50 b formed by extending in the vertical direction at the upper part. Further, a pair of elongated holes 50c extending in the vertical direction into which the lock limiting pins 24 are fitted are formed at positions corresponding to the pair of elongated holes 20b of the upper part 20 and further correspond to the upper part spin 23. A long hole 50d that is vertically slanted is formed in the position where the upper part spin 23 is inserted. Further, at the lower edge of the lock limiting plate 50, an arc-shaped lock limiting surface 50a centering on the axial center of the upper part mounting shaft 21 with the upper end of the long hole 50d abutting the upper part pin 23 is provided. Has been formed.

The arm 30 is disposed so as to overlap with the lock limiting plate 50, and is pivotally attached by an upper part attachment shaft 21 inserted into the shaft attachment hole 30 a. An arcuate elongated hole 30b centered on the shaft attaching hole 30a is formed above the shaft attaching hole 30a, and the connecting rod mounting shaft 22 is inserted into the elongated hole 30b. A pair of pin holes 30c into which the lock limiting pins 24 are fitted are formed below the shaft mounting holes 30a. Between the pair of pin holes 30c, a burr hole 30d is formed at a position corresponding to the upper part spin 23. Has been formed. Further, the operation limiting pin 70 is fitted and inserted in the insertion hole 30e formed in the intermediate portion between the shaft attachment hole 30a and the elongated hole 30b.

The lower tooth 40 is rotatably mounted on the lower tooth mounting shaft 42, and has a tooth portion 40a which is meshable with the tooth portion 20a of the upper part 20 on the free end side. The engaging member 60 is integrally attached to the lower tooth 40, and an engaging surface 60a capable of engaging with the lock limiting surface 50a of the lock limiting plate 50 is formed on one free end side. Further, the hook portion 60b formed on the other free end side of the engaging member 60 and the locking hole 10b formed in the base plate 10 are engaged with both ends of a coil-shaped tension spring 41 as biasing means. The lower tooth 40 is urged by the tension spring 41 in a direction in which the tooth portion 40a of the lower tooth 40 meshes with the tooth portion 20a of the upper part 20.

The holder plate 90 is superposed on the arm 30, and is fixed to each end of the upper part mounting shaft 21, the lower tooth mounting shaft 42, and the holder plate mounting shaft 91. Further, on the upper part of the holder plate 90, a regulation portion 90a for preventing the operation limiting pin 70 from being pulled out is formed.

Next, the operation of the first embodiment of the present invention will be described.

In normal times, as shown in FIGS. 2 and 5, the engaging surface 60 a of the engaging member 60 is pressed against the lock limiting surface 50 a of the lock limiting plate 50 by the spring force of the tension spring 41, and the lower tooth The tooth portion 40a of 40 does not mesh with the tooth portion 20a of the upper part 20, and the other side of the seatbacks S and B is in a free hinge state. In addition, the right end of the long hole 30b of the arm 30 is the connecting rod mounting shaft 22, the upper end of the long hole 50b of the lock limiting plate 50 is the upper part mounting shaft 21, and the upper ends of the pair of long holes 50c of the lock limiting plate 50 are a pair. The upper end of the long hole 50d of the lock limiting plate 50 is in contact with the lock limiting pin 24 of FIG.

In this state, when the operating lever 81 of the seat reclining device S ₁ is operated to release the lock and the seat backs S and B are rotated, the upper parts 20 and the arms 30 are connected via the connecting rod 80. Since the seat backs S and B are rotated integrally, the tilt angles of the seat backs S and B can be adjusted.

By the way, in an emergency such as a rear-end collision of the vehicle while the seat back S / B is locked by the seat reclining device S ₁ , the seat back S / B is seated by the occupant sitting on the front seat. A large impact load is applied to.

In this case, the seat back S / B on the seat reclining device S ₁ side of the seat back S / B is locked, whereas the seat back S / B on the emergency locking device S ₂ side is locked. Therefore, the arm 30 is torsionally displaced through the seatback frames B and F. Due to this torsional displacement, the arm 30 rotates rearward (in the direction of arrow A) as shown in FIG. 6 while deforming the operation limiting pin 70. When the arm 30 rotates until the left end of the long hole 30b of the arm 30 contacts the connecting rod mounting shaft 22, the lock limiting plate 50 moves upward through the upper part spin 23 and the pair of lock limiting pins 24. To do.

Along with this movement, the engagement surface 60a of the engagement member 60 separates from the lock limiting surface 50a of the lock limiting plate 50, and the spring force of the tension spring 41 counterclockwise (direction of arrow B). The tooth portion 40a of the lower tooth 40, which rotates to the right, meshes with the tooth portion 20a of the upper part 20. As a result, the seat backs S and B on the emergency device S ₂ side can be reliably locked.

When the impact load acting on the seat backs S and B is removed, the torsional displacement of the seat back frames B and F disappears, and the restoring force causes the arm 30 to move counterclockwise to the position shown in FIG. The lock limiting plate 50 is rotated and returns to its original position. As a result, the lower tooth 40 rotates clockwise through the engaging surface 60a of the engaging member 60 that is in pressure contact with the lock limiting surface 50a of the lock limiting plate 50, and the tooth portion 40a of the lower tooth 40 and the upper portion 40a. The meshing relationship of the tooth portion 20a of the tooth 20 is canceled, and the free hinge state is restored.

Therefore, according to the above configuration, in an emergency such as when the vehicle is rear-end hit, the teeth 20a of the upper part 20 and the teeth 40a of the lower tooth 40 are twisted by the torsional displacement of the seatback frames B and F. Since the meshing is performed, the rotation of the arm 30 on the free hinge side, that is, the seat backs S and B can be instantaneously and reliably locked. This can improve the safety of the occupant, simplify the structure, reduce the weight, and reduce the cost.

Further, even before the emergency lock device S ₂ is attached to the vehicle seat S, the upper part 20 and the arm 30 are integrally connected by the operation limiting pin 70, and the arm 30 relative to the upper part 20. Since the operation of the lock limiting plate 50 is limited, the lock limiting plate 50 does not move. Therefore, even if the spring force of the tension spring 41 acts on the engaging member 60 during assembly, the teeth 20a of the upper part 20 and the teeth 40a of the lower part 40 are prevented from meshing with each other, and the seat backs S and B are locked. Can be prevented. As a result, the emergency lock device S ₂ can be easily attached to the seat, and the assemblability can be improved.

FIG. 7 is a perspective explanatory view showing a modified example of the operation limiting member according to the first embodiment of the present invention, in which the arm 30 has a cut-and-raised portion 70A as the operation-limiting member. The bent portion 70A is in pressure contact with the side surface portion 20d of the upper part 20. In normal times, the arm 30 rotates integrally with the upper part 20, and the arm 30 is moved up against the upper part 20 against the elastic force of the portion 70A only in an emergency. There is.

FIG. 8 is a perspective explanatory view showing another modification of the operation limiting member according to the first embodiment of the present invention, in which a leaf spring 70B is provided on the arm 30 as the operation limiting member. The free end portion 70a of the spring 70B is pressed against the side surface portion 20a of the upper part 20. The action of the leaf spring 70B is similar to that of the cut-and-raised portion 70A shown in FIG. 7, and the description thereof will be omitted.

FIG. 9 is a front explanatory view showing the vicinity of the operation limiting member mounting portion of the emergency locking device according to the second embodiment of the present invention.

In the second embodiment, the connecting bin 70C as an operation limiting member for integrally connecting the upper part 20 and the arm 30 is removed after the emergency lock device S ₂ is attached to the vehicle seat S. Is set to be able to. Further, the lock limiting plate 50 and the holder plate 90 are provided with bale holes 50e and 90e, respectively.

Other structures and operations are almost the same as those shown in the first embodiment, and the explanation thereof will be omitted.

[0047]

[Effect of device]

 As described above, according to the vehicle seat of the present invention, the rotation of the seat back on the other side (emergency lock device side) can be reliably locked in an emergency, and the lock on the one side (sheet reclining device side) can be performed. In addition to the effect, it is possible to improve the safety of passengers in an emergency.

In addition, since the cantilever seat reclining device is normally used, it is possible to eliminate the poor synchronization during operation and the phase shift of the seat back, which are problems in the conventional double-supported seat reclining device. The number of parts and the number of assembly steps can be significantly reduced, and the weight and cost can be reduced.

Further, since the operation of the arm with respect to the upper part is restricted by the operation restricting member even before the emergency locking device is assembled to the vehicle seat, the teeth of the upper part and the teeth of the lower tooth are engaged with each other. The seat back can be prevented from being locked. As a result, the emergency lock device can be easily attached to the seat, and the assemblability can be improved.

[Brief description of drawings]

FIG. 1 is a schematic perspective explanatory view of a vehicle seat according to the present invention.

FIG. 2 is a front view showing the emergency locking device according to the first embodiment of the present invention.

3 is a cross-sectional view taken along the line III-III of FIG.

FIG. 4 is an exploded perspective view of relevant parts of FIG.

FIG. 5 is an operation explanatory view of the emergency lock device at the time of unlocking.

FIG. 6 is an explanatory diagram of the operation of the emergency locking device when locked.

FIG. 7 is a perspective explanatory view showing a modified example of the operation limiting member according to the first embodiment of the present invention.

FIG. 8 is a perspective explanatory view showing another modification of the operation limiting member.

FIG. 9 is a front view showing the vicinity of the operation limiting member mounting portion of the emergency locking device according to the second embodiment of the present invention.

[Explanation of symbols]

S Vehicle seat S ₁ Seat reclining device S ₂ Emergency locking device S / B Seat back S / C Seat cushion B / F Seat back frame C / F Seat cushion frame 10 Base plate 20 Upper parts 20a Teeth 30 Arms 40 Lower teeth 40a Teeth Part 41 Energizing means (tensile spring) 50 Lock limiting plate 50a Lock limiting surface 60 Engaging member 60a Engaging surface 70 Operation limiting member (operation limiting pin) 70A Operation limiting member (cut and raised portion) 70B Operation limiting member (plate Spring) 70C Operation limiting member (connecting pin) 80 Connecting rod

Claims (5)

[Scope of utility model registration request] 1. A seat reclining device that adjusts a tilting angle of a seat back on one side of a seat, and an emergency locking device that locks the tilting of the seat back when a load of a predetermined amount or more is applied to the seat back on the other side. A vehicle seat arranged, wherein the emergency locking device includes an upper part having teeth and a displaceable relative to the other side of the seat back on a base plate attached to the other side of the seat cushion. The arm to be mounted is coaxially mounted, and the lower tooth biased toward the upper part side has a tooth part capable of meshing with the tooth part of the upper part part. Attach the lock limiting plate with the lock limiting surface that can move to the opposite tooth side to the upper part and A vehicle seat characterized in that an engaging member having an engaging surface for engaging with a lock limiting surface of a lock limiting plate is attached to the lower tooth, and the upper parts and the arm are connected by an operation limiting member. 2. The vehicle seat according to claim 1, wherein the operation limiting member is composed of a synthetic resin pin. 3. The vehicle seat according to claim 1, wherein the operation limiting member is constituted by a cut and raised portion formed on the arm. 4. The vehicle seat according to claim 1, wherein the operation limiting member is constituted by a leaf spring provided on the arm. 5. The vehicle seat according to claim 1, wherein the operation limiting member is a removable connecting pin.