JPH04183411A - Seat for automobile - Google Patents

Abstract

PURPOSE:To make a seat back unable to perform a forward inclination operation, and prevent the intervention of a headrest with a roof trim by invalidating an operation section with an operation section control mechanism, when the seat back is inclined back over the predetermined range. CONSTITUTION:A seat back 5 is inclined back to the predetermined range by turning a wheel 41 clockwise or counterclockwise. In this case, when the seat back 5 is within the predetermined range D, an operation wire 25 is kept under tension with an operation section control mechanism 31. As a result, a pawl 17 is kept at an engagement-free position, when an operation section 23 is moved up in an arrow direction. It follows, therefore, that forward inclined state C can be obtained, when the seat back 5 is turned. On the other hand, when the seat back 5 is inclined back over the predetermined range D, the slide element 37 of the operation section control mechanism 31 moves to the lowest position of a guide groove 37a, thereby releasing the tension of the operation wire 25. According to the aforesaid construction, the operation section 23, even when moved in the arrow direction, becomes invalid, and a base plate 9 remains restricted, thereby making it impossible to obtain the forward inclined state of the seat back 5.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) TECHNICAL FIELD This invention relates to an automobile seat.

(Prior Art) Automobile seats generally consist of a seat cushion and a seat back, and the seat back generally has a reclining function that allows it to tilt rearward at a predetermined angle from a neutral position, as well as a reclining function that allows it to tilt forward significantly. It has a forward folding function.

A schematic diagram is shown in Fig. 7. seat back 101
is attached via a second rotating shaft 109 for reclining to a base plate 107 attached to the seat cushion 105 side via a first rotating shaft 103 for forward tilting, and the seat is rotated by this second rotating shaft 109 for reclining. The bag 101 is configured to take an inclined posture in which it is inclined at a predetermined angle rearward from a neutral position.

Further, the base plate 107 is kept in a restrained state by the hook 113 that engages with the striker 111, and by disengaging the hook 113 from the striker 111, the seat back 101 moves together with the base plate 107 with the first rotating wheel 103 as a fulcrum. It is now possible to obtain a state in which the robot tilts forward by rotating significantly forward.

(Problems to be Solved by the Invention) As described above, the seat back 101 can be tilted forward using the first rotating wheel 103 as a fulcrum, but at this time, the seat back 101 is tilted forward using the first rotating wheel 103 as a fulcrum. If you fall significantly backward on the axis W passing through the second rotating shaft 103, 109, the dimension from the first rotating wheel 103 to the headrest 115 of the JIT-BACK 101 becomes maximum, so you can move forward using the first rotating wheel 103 as a fulcrum. When the headrest 115 is rotated to the roof torque 117
There was a problem that caused interference. In particular, in recent years, as devices such as sunroofs have been installed and functional parts have been placed inside the roof panel, the roof tower 117, that is, the ceiling, has tended to become lower, which may lead to the above-mentioned problem.

SUMMARY OF THE INVENTION An object of the present invention is to provide an automobile seat that does not have a forward-folding function when the seatback is in a tilted position in which the seatback is tilted backwards beyond a specified range.

[Structure of the Invention] (Means for Solving the Problem) In order to achieve the above-mentioned object, the present invention includes a seat cushion that can be tilted forward together with a base plate about a first rotation axis as a fulcrum, and A seat back that can be tilted rearward from a neutral position about a second rotation axis of a base plate as a fulcrum is attached, and the base plate has an engagement position in which it engages with a striker provided on the seat cushion side in a detachable manner and restrains movement of the base plate. , the automobile seat is provided with an engagement member that can be switched to an engagement release position for releasing the restraint of the base plate, and is operatively connected via a transmission means to an operating portion that switches the engagement member to the engagement release position; However, an operating section control mechanism is provided which enables the operating section to operate when the vehicle tilts rearward within a specified range, and causes the operating section to fail to operate when the vehicle tilts backward beyond the specified range.

(Function) According to such a car seat, when the seat back is tilted backwards beyond a specified range, the operation section control mechanism is activated, so that even if the operation section is operated, the operation section is not operated. Therefore, since the base plate is placed in a restrained state, the seatback cannot be folded forward, and interference between the headrest and the roof trim can be prevented.

(Embodiment) Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings of FIGS. 1 to 4.

In the figure, reference numeral 1 indicates a seat consisting of a seat cushion 3 and a seat back 5, and a headrest 7 is provided above the seat back 5.

The seat back 5 is connected to the first rotating shaft 11 of the base plate 9.
A forward tilting function that rotates greatly forward together with the base plate 9 using the base plate 9 as a fulcrum, and a second rotating wheel 1 of the base plate 9
3 as a fulcrum, a reclining function tilted backward from the neutral position a can be obtained.

The base plate 9 is arranged on both left and right sides, and the front end side is the first
It is rotatably supported by a cushion frame (not shown) of the seat cushion 3 via a rotating shaft 11 . The rear end side is loosely fitted to the second rotating wheel 13, and the seat back frame 5 of the seat back 5 is attached to the second rotating shaft 13.
A device arm 12 is fixed to a.

The base plate 9 is provided with an engaging member 17 that removably engages with the striker 15 provided on the seat cushion 3. Third
solid line in the figure) and an engagement release position (dotted line in the figure) where the base plate 9 is released from the restraint.

The engaging member 17 is always urged to the engaged position (solid line) by the urging spring 21, and is interlocked and connected to the operating portion 23 via an actuation wire 25 serving as a transmission means.

The operating portion 23 is provided on the side of the seat back 5 and consists of an operating lever 27 and an operating knob 29, which are movable up and down about a lever shaft 27a, and the operating lever 27 is connected to the terminal portion of the operating wire 25. .

The actuation wire 25 connecting the operating lever 27 and the engaging member 17 is configured to maintain a tensioned state in which the operating portion 23 can be operated by the operation control mechanism 31 and a slack state in which the operating portion 23 is undone. It has become.

That is, the operating section control mechanism 31 is fixed to the second rotation shaft 13 as shown in FIGS.
an eccentric first plate 3 having a guide groove 33 consisting of b;
5, a second plate 37 fixed to the base plate 9 and having a vertically long guide groove 37a, and the guide groove 3
3 and a slider 39 movable along the guide groove 37a, and the actuation wire 25 is locked to the slider 39. When the seat back 5 is tilted rearward at a predetermined angle from the neutral position a, the slider 39 faces the area of the lateral groove 33b of the guide groove 33 and the upper area of the guide groove 37a, and the slider 39 faces the area of the lateral groove 33b of the guide groove 33 and the upper area of the guide groove 37a, A tension state of 25 is ensured. Further, when the seat back 5 tilts backward beyond the specified range to position b, the slider 39 moves from the horizontal groove 33b into the area of the vertical groove 33a and the lowest area of the guide groove 37a. The actuating wires 25 become slack. The amount of slack in the actuation wire 25 is set to be larger than the actuation amount S of the operating section 23.

On the other hand, a reclining mechanism 43 is attached to the base plate 9. When the handle 41 is rotated to the right, the seat back 5 is tilted backward, and when the handle 41 is rotated to the left, the seat back 5 can be rotated back to the neutral position a.

The reclining mechanism 43 is composed of an external gear and an internal gear that has one more tooth than the external gear. The gear plates of the gears are each fixedly supported by a base plate 9.

5 and 6 show modified examples of the operating section control mechanism 31. FIG. In this embodiment, a rotatable actuation arm 45 loosely fitted to the second rotating shaft 13 and a second rotating wheel 1
an actuation plate 49 fixed to 3 and having an actuation pawl 47;
The tip of the operating arm 45 and the base plate 11
An arc-shaped elongated hole 5 centered on the second rotating shaft 13 is formed in
It consists of a slider 53 that can freely slide inside the slider 1, and an actuation wire 25 is locked to the slider 53. When the seat back 5 is in the neutral position 1a, the actuating arm 45 and the slider 53 are always urged to the state A by the urging spring 55, and the actuating claw 47 is separated from the arm portion 45a of the actuating arm 45 by a predetermined distance. set in position.

Note that other constituent elements are the same as those of the previous embodiment, so the same reference numerals are given and detailed explanations are omitted. 57 indicates an intermediate wire guide pin.

Therefore, when the seat back 5 inclines backward beyond the specified range, the actuating arm 45 is rotated to the imaginary line position by the actuating claw 47 of the actuating plate 49. As a result, the actuating wire 25 has a tensioned length connecting the wire guide pin 57, the slider 53 at the position A, and the connecting point P of the engaging member 15, and the wire guide pin 57, the slider at the mouth position. Since the length is almost a straight line connecting the connecting point P of the mover 53 and the engaging member 15, the operating wire 25 becomes slack due to the difference in length. As a result, a state in which the operation section 23 is not operated is ensured.

According to the automobile seat configured in this way, by rotating the handle 41 to the right or left, the seat back 5 can be adjusted.
A reclining state is obtained in which the seat is tilted backward at a predetermined angle. At this time, when the seat back 5 is within the specified range, the operating wire 25 is kept in tension by the operating section control mechanism 31, so the operating section 23 cannot be operated upward in the direction of the arrow in FIG. The engagement member 17 is now in the disengaged position (dashed line). Therefore, by rotating the seat back 5 forward, the forward tilting state C can be obtained.

On the other hand, when the seat back 5 is tilted rearward beyond the specified range, the slider 37 of the operating section control mechanism 31 moves to the lowest position of the guide groove 37a, and the tension on the actuating wire 25 is relaxed. For this reason, even if the operating portion 23 is operated in the direction of the arrow, the driver misses the swing and the base plate 9 remains in the restrained state, so that the seat back 5 cannot be tilted forward.

As a result, interference of the headrest 7 with the roof trim is prevented.

In this embodiment, the looseness of the actuation wire 25 is used to obtain the idle state of the operating section 25, but it is also possible to obtain the idle state of the operating section 23 by replacing the actuating wire 25 with other means. It is also possible to do so.

[Effects of the Invention] As explained above, according to the automobile seat of the present invention, when the seat back is tilted backward beyond the specified range, the operation section control mechanism causes the operation section to fail to operate. I can do it. Therefore, the base plate is placed in a restrained state, and as a result, the seat back cannot be tilted forward, and interference of the headrest with the roof trim can be prevented.

[Brief explanation of drawings]

Figure 1 is a schematic side view of a seat embodying this invention;
The figure is a schematic perspective view of the seat back frame, Figure 3 is an enlarged side view showing the operating unit control mechanism, and Figure 4 is the TV shown in Figure 3.
-IV line sectional view, FIG. 5 is an enlarged side view similar to FIG. 3 showing a modification of the operating unit control mechanism, and FIG.
-VI line sectional view, FIG. 7 is an explanatory view of a sheet showing a conventional example. 3... Seat cushion 5... Seat back 9... Base plate 11... First rotating shaft 13... Second rotating shaft 15... Striker 17... Engaging member 25... Operation Wire (transmission means) 31... Operating unit control mechanism 3... Seat cushion 5... Seat back 9... Base plate 11... First rotating shaft 13... Second rotating shaft 15... Striker 17... Engagement member 25... Actuation wire (transmission means) 31... Operating unit control mechanism 1'/Fig. 1, Fig. 2, Fig. 4, Fig. 6, Fig. 7

Claims (1)

[Claims] A seat back that can be tilted forward together with the base plate about the first rotation axis as a fulcrum and tilted backward from a neutral position using the second rotation axis of the base plate as the fulcrum is attached to the seat cushion, and the seat back is attached to the base plate. An engaging member is provided that can be switched between an engaging position where the striker provided on the side can be freely engaged and disengaged to restrict movement of the base plate, and an engaging release position where the base plate is released from the engagement, and the engaging member is disengaged. In an automobile seat that is interlocked and connected to an operating section for switching to a position via a transmission means, the seat back is configured to
For automobiles, characterized by having an operation part control mechanism that enables the operation part to operate when the vehicle tilts backward within a specified range, and causes the operation part to fail to operate when the vehicle tilts backward beyond the specified range. sheet.