JPH0628040Y2 - Car seat - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial field of application) The present invention relates to a vehicle seat (seat) whose seat cushion is positionally adjustable in the front-rear direction.

(Prior Art) As a conventional center-folded sheet whose front-back position can be adjusted, there are sheets shown in FIGS. 3 to 4 (Japanese Utility Model Publication No. 57-11580 and Japanese Utility Model Publication No. 60-31547). reference).

In these figures, the seat cushion 1 can be adjusted in position forward and backward by a slide 5 on a floor 9, a seat back 2 has an upper back portion 6 and a lower back portion 7, and a lower back portion 7 is provided at a rear portion of the seat cushion 1. The lower ends are joined by hinge pins 4,
The upper end of the upper back 6 is joined to the lower end by a hinge pin 3. The upper back portion 6 is connected to the back panel on the vehicle body side by an adjuster (guide hole) so as to be slidable in the vertical direction.

In the conventional type, when the seat cushion 1 is moved forward, the lower part of the lower back part 7 of the seat back 2 moves forward as shown in FIG. 4 from the state of FIG. 3, and the upper part also slides as shown by the arrow accordingly. Then, it moves downward and fills the space with the waist of the occupant so that the posture can be easily adjusted.

(Problems to be solved by the invention) However, in such a conventional one, since the lower back portion of the seat back is connected to the seat cushion and the upper back portion only by the hinge pins, the lower back portion having a particularly large load distribution force is used. Rattling (clearance) at the connecting pin part on the back
Due to this, there was a problem that abnormal noise was generated and the product strength was reduced.

This invention provides a vehicle seat with less rattling noise by improving a method of supporting an upper end portion of a lower back portion having a large load distribution force in a seat capable of appropriately responding to a posture change of an occupant. The purpose is to improve the above-mentioned problems.

[Means for Solving the Problems] (Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention has a seat cushion whose position can be adjusted in the front-rear direction of a vehicle body and a lower end of a reclining device at the rear end of the seat cushion. And a lower back portion of the seat back connected to the upper back portion of the seat back, the lower end of which is in contact with the upper end of the lower back portion and which is attached to the vehicle body by a slider so as to be vertically movable. The tilt angle is increased in association with the forward movement of the.

(Operation) When the seat cushion is moved forward, the lower end of the lower back part also moves forward, but at the same time, its inclination angle increases and its upper end lowers. For this reason, the upper back also naturally lowers. This allows the occupant to take a comfortable posture. The lower back of the seat back is connected by the seat cushion and the reclining device, so there is little backlash.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

First, the configuration will be described. In FIG. 1, a seat cushion 1 is installed by a slide rail 5 so as to be movable in the front-rear direction of a vehicle body, and a rear end thereof and a lower end of a lower back portion 7 of a seat back are connected by a reclining device 11. The upper back portion 6 of the seat back is separated from the lower back portion 7, and is mounted on a vehicle body side back panel 8 so as to be vertically movable by a slider 13.

As shown in FIG. 2, the slide rail 5 is rotated by a motor 15 in a worm screw gear box 27, and has a bar screw 17 whose forward and backward movement is stopped, and a nut which is screwed into the bar screw 17 and whose rotation is stopped. The bracket 19 and the frame 25 of the seat cushion 1 integrated with the bracket 19
Is attached to the vehicle body floor 9 by sliding on the upper rail 21 and the upper rail 21 attached to the vehicle body floor 9.
It consists of 3.

The reclining device 11 includes an arm 31 attached to the cushion frame 25 and an arm 35 attached to the lower back frame 33. The arm 31 is integrated with the case 32, and the case 32 houses an internal gear 37 and an external gear 39 that are eccentrically engaged with each other and mesh with each other, as in the conventional case. The internal gear 37 has one more tooth than the external gear 39, and is supported by the case 32 so as to be rotated by the core wire of the flexible wire 41. External gear 3
Reference numeral 9 is configured integrally with the lower back arm 35. The other end of the flexible wire 41 is connected to the rear end of the rod screw 17 and attached so that the rotation thereof can be transmitted to the inner core wire.

The upper back frame 43 integrally has a bracket 45,
Two slide pins 47 are vertically screwed and fixed to the bracket 45. The slider 13 fixed to the vehicle body rear panel 8 (FIG. 1) is provided with an elongated hole 49 in which a slide pin 47 can slide vertically.

Next, the operation of the above embodiment will be described. When the switch (not shown) is turned on because the passenger wants to relax in the state shown by the solid line in FIG. 1, the motor 15 rotates and the rod screw 17 is turned. Since the rod screw 17 is stopped from moving back and forth, the bracket 19 with nut moves forward to move the upper rail 21 integrated with the bracket 19 and thus the seat cushion frame 25 and the seat cushion 1 forward. Since the lower back portion 7 is connected to the seat cushion 1 by the reclining device 11 together with the frame 33, the lower end thereof moves forward. At the same time, the rotation of the rod screw 17 is changed by the flexible wire 41 to the reclining device 1.
It is transmitted to the internal gear 37 in 1 and rotates this. The rotation of the internal gear 37 causes the external gear 39 to move to 1
The inclination angle α is increased by a minute angle (for example, several degrees) per rotation for each rotation. As a result, the lower back portion 7 inclines in a chain line. Since the upper end of the lower back portion 7 is lowered due to the inclination of the lower back portion 7, the upper back portion 6 which is in contact with the lower end portion of the upper back portion 6 is attached by its own weight to the integral pin 47 of the frame 43.
It slips inside 9 and becomes a state of a chain line. This allows the occupant to take a relaxed position.

Thus, even if a large load is applied to the lower back 7 by the occupant, the lower back 7 is firmly connected by the reclining device 11, so there is less rattling compared to the conventional thin pin connection. Therefore, no abnormal noise is generated. When the sheet is returned to its original position, the above procedure is reversed. At this time, the upper back 6 is returned to the original position even if it is pushed up by the lower back 7.

The present invention is not limited to the above embodiment. That is, a motor for moving back and forth and a motor for reclining may be provided, and these may be synchronized by a controller. Alternatively, a reclining device may be connected by a cable or a link so as to interlock with a slide rail for moving back and forth without using a motor at all. It may be configured.

[Advantages of the Invention] As described above, the present invention has a seat cushion whose structure can be adjusted in the longitudinal direction of the vehicle body and a seat back whose lower end is connected to the rear end of the seat cushion by a reclining device. A lower back portion and an upper back portion of a seat back whose lower end is in contact with the upper end of the lower back portion and which is attached to the vehicle body by a slider so as to be vertically movable. The reclining device is interlocked with the forward movement of the seat cushion. Since the configuration is such that the tilt angle is large, there is an effect that the generation of abnormal noise is reduced.

[Brief description of drawings]

FIG. 1 is a side view of an embodiment of the present invention, FIG. 2 is a disassembled perspective view of the same, and FIGS. 3 and 4 are side views showing before and after the change of the conventional one. Explanation of symbols appearing in the drawings 1 ... Seat cushion, 5 ... Slide rail 6 ... Upper back, 7 ... Lower back 8 ... Vehicle side back panel, 9 ... Floor 11 ... Reclining device, 13 ... Slider 15: Motor

Claims (1)

[Scope of utility model registration request] 1. A seat cushion whose position can be adjusted in the front-rear direction of a vehicle body, a lower back portion of a seat back whose lower end is connected to a rear end of the seat cushion by a reclining device, and a lower end of which touches an upper end of the lower back portion. A seat for an automobile, which comprises an upper back portion of a seat back mounted on a vehicle body so as to be movable up and down, and the reclining device has a large inclination angle in association with forward movement of a seat cushion.