JPS6342846Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a seat hinge used for seats of various vehicles.

For example, front seats installed in two-door automobiles are required to have a seat back that can be folded forward for passengers in the rear seats to get in and out of the vehicle. Therefore,
The front seat includes a seat back rotatably connected to a seat cushion by a seat hinge.

However, if the seat back is simply rotatably connected to the seat cushion in this way, if the vehicle decelerates due to a collision or sudden braking, the seat back will rotate forward and protect the rear seat occupant. There is a risk that the seat bag will no longer be able to support the seat.

Therefore, conventionally, a latch bar that swings due to the sensing action of a deceleration sensor is pivotally attached to a movable arm fixed to the side of the seat back of a seat hinge, while a fixed arm fixed to the side of the seat cushion engages and disengages the tip of the latch bar. When the vehicle decelerates to a predetermined value or more and the seat bag attempts to rotate forward, the latch bar swings based on the action of the sensor, and the tip of the bar touches the stopper. It is known that the movable arm is engaged to lock the forward rotation of the movable arm.

However, in such a conventional configuration, since the lock portion is located at one location between the tip of the latch bar and the stopper portion, excessive stress is concentrated on that portion, and therefore the latch bar and its pivot as well as the stopper are It is necessary to increase the strength by increasing the thickness and diameter of the parts, and since there is only one locking part, torsional stress is applied to the movable arm and fixed arm, so the thickness of the plates of these arms must also be increased to increase the strength. As a result, not only is it disadvantageous in terms of cost, but it also becomes very heavy, especially in cars where weight reduction is required to improve fuel efficiency and output. There was a problem that made it disadvantageous for vehicle use.

In view of the conventional situation, the present invention is capable of dispersing the stress generated when the seat back is locked, and does not generate torsional stress on the arm.As a result, the plate thickness and shaft diameter of each member are reduced to reduce weight. The purpose of this invention is to provide a seat hinge that can be used as a seat hinge.

In order to achieve the above object, the present invention provides a seat hinge in which a fixed arm fixed to the seat cushion and a movable arm fixed to the seat bag are rotatably connected by a shaft, and the fixed arm and the movable arm have a plurality of hinges. A lock plate is provided on the shaft adjacent to one side of the movable arm, and has a plurality of protrusions formed on one side at positions that match the lock holes, and has ratchet teeth on the circumferential side. The formed cam plate is slidably arranged to prevent it from coming out, and the lock plate is pressed against the cam plate between the movable arm and the lock plate, so that the protrusion is released from the lock hole of the fixed arm. A set spring is installed between the lock plate and the cam plate, and the set spring is fixed at a position where it engages with the lock hole of the movable arm.
The relative rotation of the lock plate and the cam plate moves the lock plate toward the movable arm against the set spring force to form a cam mechanism that engages the protrusion with the lock hole of the fixed arm; A deceleration sensor is provided on the arm, and when the movable arm attempts to rotate forward due to deceleration of a predetermined value or more occurring in the vehicle, the cam plate is swung based on the sensing action of the deceleration sensor. A lock pawl is provided which engages with the ratchet teeth of the cam plate and restrains rotation of the cam plate.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

In Figures 1 and 2, 1 is a fixed arm fixed to the side of the seat cushion (not shown), 2 is a movable arm fixed to the side of the seat back (not shown), and is constructed by joining two plates 2a and 2b. A fixed arm 1 is sandwiched between these plates and rotatably connected to the fixed arm 1 by a shaft 3.

The fixed arm 1 has an arcuate hole 4 centered on the shaft 3, while the movable arm 2 has a plate 2.
a pin 5 that loosely fits into the arcuate hole 4 across a and 2b;
is fixed with an E-ring 5a to prevent it from coming off, and the range of rotation of the movable arm 2 is restricted by cooperation between the arcuate hole 4 and the pin 5.

In the two plates 2a, 2b of the fixed arm 1 and the movable arm 2, a plurality of lock holes 6, 7a, 7b are formed on the same circumference around the shaft 3 at the same pitch.

On the other hand, on the shaft 3 is a plate 2a of the movable arm 2.
A set spring 8, a lock plate 9, and a cam plate 10 that is in elastic contact with the side surface of the lock plate 9 by the set spring 8.
are slidably arranged in this order. The lock plate 9 has a plurality of protrusions 11 that align with the lock holes 6, 7a, 7b and engage and disengage from the lock holes 6, 7a, 7b. These set spring 8, lock plate 9, and cam plate 10 are prevented from coming off by washers 12 and E-rings 13, and the position where the protrusions 11 of the lock plate 9 are exactly in contact with the lock plate 2a of the movable arm 2 is at this position. It is set at a position where it engages only with the hole 7a. Further, a plurality of cam holes 14 are formed in the lock plate 9 on the same circumference around the shaft 3. Ratchet teeth 15 are formed on the circumferential side of the cam plate 10 to face the forward rotation direction of the movable arm 2, and a plurality of cam protrusions that loosely fit into the cam holes 14 are formed on the side surface facing the lock plate 9. 1
6 is provided protrudingly. The cam protrusion 16 has a slope 16a at its tip, and when the cam plate 10 stops and the lock plate 9 rotates forward together with the movable arm 2, the lock plate 9 is rotated along the slope 16a.
The lock plate 9 is moved on the shaft 3 toward the movable arm 2 side against the force of the set spring 8, and the projections 11 are engaged with the lock holes 6 and 7b. Therefore, in this embodiment, the cam hole 14 and the cam protrusion 16 constitute a cam mechanism. Further, the width of the locking hole 6 is made slightly larger than the length of the projection 11 and the locking holes 7a and 7b so that it can be engaged with the projection 11 even if the movable arm 2 rotates slightly.

Reference numeral 17 denotes a deceleration sensor disposed on the side surface of the fixed arm 1. In this embodiment, a bracket 18 is fixed to the fixed arm 1, and a weight 1 is attached to this bracket 18.
9 is suspended swingably. A lock pawl 20 is swingably supported on the bracket 18. This lock pawl 20 comes into contact with the head 19a of the weight 19, and when a deceleration of more than a predetermined value occurs, it rotates upward as the weight 19 swings and engages with the ratchet teeth 15 of the cam plate 10. to lock the cam plate 10.

The operation of the seat hinge having the structure of the above embodiment will be described in detail with reference to FIGS. 3 and 4.

Under normal conditions, the deceleration sensor 17 does not detect the deceleration, so the lock pawl 20 maintains its stationary position. Therefore, the movable arm 2 can be freely rotated, and the movable arm 2 is rotated as shown by the chain line in FIG. 3, that is, the seat back (not shown) is folded forward to facilitate the getting on and off of the rear seat occupant.

When the deceleration exceeds a predetermined value during a vehicle collision, sudden deceleration, or sudden braking, the seat back (not shown) attempts to rotate forward due to inertia, but the weight 19 of the deceleration sensor 17 swings. With this rocking, the lock pawl 20 rotates upward and engages with the ratchet teeth 15 of the cam plate 10 to lock the cam plate 10. On the other hand, the lock plate 9 rotates forward together with the movable arm 2, so that the lock plate 9 rides on the cam projection slope 16a of the cam plate 10 and moves toward the movable arm 2 against the force of the set spring 8. As a result, the protrusion 11 engages the locking hole 6 of the fixed arm 1 and the locking hole 7b of the plate 2b, and thus,
The movable arm 2 is locked to prevent the seat bag from rotating forward.

The embodiment shown in FIG. 5 shows a modification of the cam mechanism of the cam plate 10, the ratchet teeth 15, and the deceleration sensor.

That is, in this embodiment, the cam plate 10
A boss 21 is formed on the side facing the lock plate 9, and a plurality of spiral protrusions 22 are formed on the outer periphery of the boss 21, and the helical protrusions 22 match with the shaft 3 insertion hole of the lock plate 9. A plurality of spiral grooves 23 are formed, and when the lock plate 9 rotates forward together with the movable arm 2 while the cam plate 10 is in the locked state, the lock plate 9 is rotated by the guiding action of the spiral protrusion 22 and the spiral groove 23. moves toward the movable arm 2 against the force of the set spring 8, and the protrusion 11 engages with the lock hole 6 of the fixed arm 1 and the lock hole 7 of the plate 2b to lock the movable arm 2, that is, the seat back. It was designed to do so. Further, only one ratchet tooth 15 is formed, and the others are simply circular arcs.

Furthermore, the deceleration sensor 17 is connected to the bracket 1.
A recess 24 is formed on the upper surface side of the lock pawl 20, and an inertial body 25 called a standman, which has a conical recess 25a on the upper surface and a protrusion 25b on the lower bottom, is arranged in the recess 24. A protrusion 26 is provided and the protrusion 26 is inserted into the conical recess 25a of the inertial body 25.
It is in contact with the That is, in this embodiment, as the inertial body 25 swings within the recess 24 at a predetermined deceleration, the protrusion 26 of the lock pawl 20 is pushed up on the surface of the conical recess 25a, and the lock pawl 20 is pushed up against the ratchet of the cam plate 10. It engages with tooth 15 and performs the series of locking operations described above. In this embodiment, the lock holes 6, 7a, 7b and the protrusions 11 do not necessarily have to be provided on the same circumference at the same intervals, but the positions and shapes are such that the lock holes 6, 7a, 7b and the protrusions 11 can match. As long as it becomes .

As described above, according to the present invention, when the lock is locked, the plurality of protrusions on the lock plate engage with the plurality of lock holes formed in the movable arm and the fixed arm to lock the lock. The load at the time of locking is distributed to the plurality of locking parts, so that there is no excessive stress concentration at one point as in the conventional case, and no torsional stress is generated in these two arms. Sufficient strength can be obtained even if the thickness, diameter of the spindle, and thickness of the protrusion of the lock plate (in other words, the plate thickness of the lock plate) are reduced, and the weight of the hinge can be significantly reduced. At the same time, this has a great practical effect of being able to reduce costs.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention;
Figure 2 is a perspective view showing the back of the cam plate, Figure 3 is a perspective view showing the back side of the cam plate.
Figures A and B and Figure 4 A and B are side views showing the same operating mode, sectional views taken along line B-B, and Figure 5.
The figure is a perspective view showing another embodiment. 1... Fixed arm, 2... Movable arm, 3...
Support shaft, 6, 7a, 7b...Lock hole, 8...Set spring, 9...Lock plate, 10...
Cam plate, 11...Protrusion, 15...Ratchet tooth, 14, 16...Cam mechanism, 17...Deceleration sensor, 20...Lock pawl, 22, 23
...Cam mechanism.

Claims (1)

[Scope of utility model registration request] In a seat hinge in which a fixed arm fixed to a seat cushion and a movable arm fixed to a seat bag are rotatably connected by a shaft, a plurality of lock holes are provided in the fixed arm and the movable arm, and a plurality of lock holes are provided on the shaft. Adjacent to one side of the movable arm, a lock plate having a plurality of protrusions formed on one side at positions that match the lock holes, and a cam plate having ratchet teeth formed on the circumferential side are slidably prevented from coming out. and press the lock plate against the cam plate between the movable arm and the lock plate to a position where the protrusion leaves the lock hole of the fixed arm and engages with the lock hole of the movable arm. A set spring to be fixed is loaded between the lock plate and the cam plate, and the lock plate is moved toward the movable arm side against the force of the set spring by relative rotation of the lock plate and the cam plate. A cam mechanism is formed to engage the protrusion with the lock hole of the fixed arm, and a deceleration sensor is provided on the fixed arm, and the movable arm attempts to rotate forward when the vehicle experiences deceleration exceeding a predetermined value. and a lock pawl that is swung based on the sensing action of the deceleration sensor and that locks onto the ratchet teeth of the cam plate to restrain rotation of the cam plate. seat hinge.