JPH0513636Y2 - - Google Patents

Description

[Detailed Description of the Invention] <<Industrial Application Field>> This invention relates to a vehicle seat equipped with a walk-in mechanism.

<Prior Art> In a two-door car, in order to make it easier to get in and out of the rear seats, when the seat back of the front seat is tilted forward, the seat slide device that supports the seat cushion is unlocked and the seat cushion is moved by the spring. Some are equipped with a walk-in mechanism that automatically moves forward. Further, such vehicle seats are generally equipped with a reclining device for tilting the seat back with respect to the seat cushion.

If the reclining device is of a stepless adjustable type, i.e. gears are always in mesh, the seat back is not normally folded forward onto the seat cushion. The front end portion is rotatably attached to the side portion of the seat cushion via a support shaft, and the seat back is tilted forward around the support shaft. Furthermore, even if the reclining device is of a step-adjustable type, this method is sometimes adopted because such a configuration provides sufficient space behind the seat back for getting on and off the seat when the seat back is folded forward.

FIG. 6 shows an example of a vehicle seat equipped with such a walk-in device.
The seat cushion 1 is supported on the vehicle floor via a seat slide device 2 so as to be movable back and forth. A lower part of a seat bag 3 is connected to the rear part of the seat cushion 1 by a reclining device 4 so as to be tiltable in the front and rear directions. The arm 5 of the reclining device 4 is fixed to the seat back 3,
The base 6 has its front end rotatably attached to the side of the seat cushion 1 via a support shaft 7. A seat cushion 1 is attached to the rear end of the base 6.
A recess 9 into which a rod-shaped striker 8 protruding from the side is fitted is formed, and a latch 10 for holding the striker 8 together with the recess 9 is rotatably provided by a pin 11. Latch 1
0 is rotatably biased toward the striker 8 by a spring (not shown), and is connected to a knob 12 provided on the side of the seat bag 3 by a wire 13. Further, a wire holding member 14 is fixed to the support shaft 7 at the front end of the base 6, one end of a wire 15 is connected to the tip end of the wire holding member 14, and the other end is connected to a lock pawl of the seat slide device 2. A walk-in mechanism 16 is constituted by each of these members.

The seat slide device 2 and the reclining device 4 are each independently adjustable, and are adjusted to a position and angle that suit the physique of the seated person. To operate the walk-in mechanism 16, first operate the knob 12 on the side of the seat bag 3 to pull the latch 10, remove the latch 10 from the striker 8, and move the seat bag 3 forward. This results in
The seat back 3 rotates around the support shaft 7 at the front end of the base 6 together with the reclining device 4 in the locked state, and the wire 15 is pulled by the wire holding member 14 fixed to the support shaft 7, causing the seat slide device 2 to move. After the lock is released, the seat cushion 1 is advanced to the frontmost position by the force of a spring (not shown). When you finish getting in and out of the rear seat and move seat back 3 backwards, seat cushion 1 moves backwards at the same time.
After the latch 10 hits the striker 8 and is returned, it returns to the opposite direction and moves the striker 8 to the base 6.
The wire 15 is returned and the seat slide device 2 is locked.

<<Problems to be Solved by the Invention>> As described above, in the vehicle seat equipped with such a walk-in mechanism 16, the reclining device 4 is adjusted independently. For this reason,
When the seat back 3 is moved forward from the standard use device P in its normal use state to the forward position Q, and when it is moved forward from the backward position R including the fully reclined state tilted further back than the standard use position P to the forward position Q. Since the rotation angle of the wire holding member 14 is different, the amount of pulling of the wire 15 is also different. This type of seat is designed so that the seat slide device 2 is unlocked when the wire 15 is pulled from the standard use position P of the seat back 3. Therefore, when the seat is moved forward from the rearward tilting position R to the forward folding position Q. , standard usage position P
The amount of wire 15 to be pulled will be greater than when the wire is moved forward from the position Q to the forward position. may be damaged.

SUMMARY OF THE INVENTION An object of this invention is to provide a vehicle seat in this type of walk-in mechanism that can absorb excessive pulling of the wire used to unlock the seat slide device.

<Means for Solving the Problems> The vehicle seat according to this invention includes a seat slide device that supports the seat cushion so that it can move back and forth relative to the vehicle floor, and a reclining device that connects the seat back so that it can tilt relative to the seat cushion. The front end of the base of the reclining device is rotatably coupled to the side portion of the seat cushion via a support shaft, and when the seat bag is tilted forward around the support shaft, a wire holding member fixed to the support shaft is attached. The vehicle seat is equipped with a walk-in mechanism in which a wire is pulled to unlock the seat slide device and move the seat cushion forward, the wire having one end attached to the wire holding member, The other end is attached to a cam that engages a lock pawl of the seat slide device, and the cam has a first cam surface that operates the lock pawl to release the lock by pulling a certain amount of the wire; The lock pawl is characterized in that it has a second cam surface that maintains the operating state of the lock pawl when the lock pawl is pulled more than a certain amount.

《Operation》 When the seat back is tilted forward from its standard use position around the spindle, the lock pawl is activated by the first cam surface of the cam with a specified wire pull amount, and the seat slide device is unlocked, and the seat slide device is unlocked. In mechanism works. Also, if the seat back is moved forward from the rearward tilted position than the standard use position,
After the wire is pulled by a specified amount to release the lock, when the wire is pulled further to the forward position, the second cam surface of the cam acts on the lock pawl to release the lock. is retained.

<<Embodiment>> FIG. 1 shows the main part of an embodiment of this invention. A hole 22 is provided in the rear side surface of the seat cushion frame 21, into which a support shaft 25 that projects laterally from the front end of the base 24 of the reclining device 23 is rotatably inserted. The base end portion of the wire holding member 26 is fixed to the portion with a screw 27 to prevent rotation.

A latch 28 is attached to the pin 2 at the rear end of the base 24.
The seat cushion frame 2 is rotatably attached to the base 24 by a tension coil spring 31 in the direction of a recess 30 provided in the base 24.
A striker 32 protruding from the side surface of 1 is held in between. Further, an arm is rotatably coupled to the rear end of the base 24 via a reclining mechanism (not shown), this arm is fixed to the seat back frame, and the latch 28 has a mechanism for releasing the engagement with the striker 32. wire 33
is installed.

On the other hand, the seat slide device 34 has an upper rail 35 fixed to the lower part of the seat cushion frame 21, and a lower rail 36 slidably connected to the upper rail 35 fixed to the vehicle floor. An operating lever 38 is rotatably attached to the upper surface of the upper rail 35 via a bracket 37, and the upper middle portion of a lock pawl 39 is fixed to the operating lever 38. A lock plate 41 having a plurality of lock holes 40 is fixed to the lower surface of the lower rail 36, and a claw 39a at the lower end of the lock claw 39 selectively engages with one of the lock holes 40. In this state, the operating lever 38
It is held by a torsion coil spring 42 provided at the rear end. From the bracket 37 fixed to the upper surface of the upper rail 35, a cam support piece 4 is attached.
3 is formed to protrude, and on this cam support piece 43,
A cam 44 is rotatably attached by a pin 45. The cam 44 has a cam surface on its circumferential surface located at an upper portion 39b above the operating lever 38 of the lock pawl 39.
A rigid wire 46 is stretched between the wire holding member 26 and the wire holding member 26 .
Although this wire 46 may have flexibility,
In that case, it is advisable to provide a guide to ensure that the force is transmitted correctly.

Next, the operation of this walk-in mechanism will be explained. Now, operate the knob provided on the side of the seat back to remove the latch 28 from the striker 32 via the wire 33, and move the seat back to the spindle 25.
When the cam 44 is moved forward around the pin 4, the wire 46 is pulled through the wire holding member 26 fixed to the support shaft 25, and the cam 44 is moved forward through the wire 46.
5 and pushes the upper part 39b of the lock pawl 39, the lower pawl 39a comes out of the lock hole 40 and is unlocked, and the upper rail 35 moves to the frontmost position against the lower rail 36 by the force of a spring (not shown). .

As shown in FIG. 2, the cam 44 has a first cam surface 44a whose radius R1 gradually increases to press the lock pawl 39 to release the lock, and a radius R2 whose maximum value is a constant radius R2. It has a second cam surface 44b that maintains the unlocked state of the lock pawl 39. Ranges a and b in which each cam surface 44a and 44b are formed are approximately 90 degrees, respectively. cam 44
In the normal state, the first cam surface 44a in range a is in contact with the upper part 39b of the lock pawl 39, and the pawl 39a at the lower end thereof enters the lock hole 40 of the lock plate 41 to maintain the locked state. From this state, the seat back is moved forward and the wire 4
When 6 is pulled, the cam 44 rotates clockwise around the pin 45. Since the radius R1 of the first cam surface 44a gradually increases, the lock pawl 3
The upper part 39b of the lock plate 9 is pushed by the rotating first cam surface 44a and rotates around the operating lever 38, and the claw 39a at its lower end slips out of the lock hole 40 of the lock plate 41 to release the lock. . This operation is performed on the first cam surface 4 as shown in FIG.
When the second cam surface 44b contacts the upper part 39b of the lock pawl 39, the radius R2 of the second cam surface 44b is constant, so the cam 44 is
It is pulled by the wire 46 and rotates further without pushing the lock claw 39. Therefore, by appropriately determining the range b of the second cam surface 44b, the seat back can be tilted forward from any rearward tilting position without applying excessive force to the wire 46, the locking pawl 39, or other members. become able to.

4 and 5 show the main parts of another embodiment of this invention which utilizes a slide cam 47 instead of the rotary cam 44 as described above. The slide cam 47 includes a first cam surface 47a having a slope shape that operates the lock pawl 39 to release the lock by pulling a certain amount of the wire 46, and a first cam surface 47a that continuously maintains the unlocked state of the lock pawl 39. It has a linear second cam surface 47b. This cam 4
7 has an elongated hole 48 in the sliding direction, and a 2 protruding from the surface of the cam support piece 49 is provided in this elongated hole 48.
The book guide pins 50 and 51 are engaged, and the cam 47
slidingly guided in the front and back direction. The cam support piece 49 is
It may be formed to protrude from the bracket 37 fixed to the upper rail 35 in the same way as shown in FIG.
An independent member may be directly fixed to the upper surface of the upper rail 35.

When the seat bag is tilted forward and the cam 47 is pulled by the wire 46, the lock pawl 39 is pushed by the sloped first cam surface 47a of the cam 47 to release the lock. When the seat back is further tilted forward from this state and the wire 46 is pulled, the linear second cam surface 47b of the cam 47 comes into contact with the lock pawl 39, so that the cam 47
No matter how much it is pulled, the lock claw 39 will not be pushed. Therefore, by appropriately determining the length of the second cam surface 47b and the length of the elongated hole 48, any type of seat back It is also possible to tilt forward from a backward leaning position.

《Effects of the invention》 As described above, the vehicle seat according to this invention is able to maintain the specified pull amount for unlocking the wire even if the seat back is tilted forward from a rearward tilted position behind the standard use position of the seat back. The cam absorbs the amount that exceeds the limit, so no excessive force is applied to the wires and related components, making it possible to create a vehicle seat with an easy-to-operate and highly reliable walk-in mechanism. It can be realized.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of essential parts showing an embodiment of this invention, FIGS. 2 and 3 are partial plan views for explaining the operation of the same embodiment, and FIGS. 4 and 5 are: FIG. 6, a partial plan view for explaining the operation of another embodiment of this invention, is a schematic side view of a conventional vehicle seat. 21... Seat cushion frame, 23...
Reclining device, 24...Base, 25...
Support shaft, 26... wire holding member, 34... seat slide device, 39... lock claw, 44... cam, 44a... first cam surface, 44b... second cam surface, 46... wire.

Claims (1)

[Scope of utility model registration request] a seat slide device that supports the seat cushion so as to be movable back and forth with respect to the vehicle body floor; a reclining device that connects the seat back so as to be tiltable relative to the seat cushion; and a front end of the base of the reclining device that is attached to a side portion of the seat cushion. When the seat bag is rotatably connected via a support shaft and is tilted forward around the support shaft, a wire is pulled by a wire holding member fixed to the support shaft, and the seat slide device is unlocked and the seat back is moved forward. The vehicle seat is equipped with a walk-in mechanism in which the seat moves forward, and the wire has one end attached to the wire holding member and the other end attached to a cam that engages with a locking pawl of the seat slide device. a first cam surface, wherein the cam operates the lock pawl to release the lock when the wire is pulled by a certain amount; and the lock pawl remains in an activated state when the wire is pulled by a certain amount or more. A vehicle seat characterized by having a second cam surface.