JPH08266357A - Backrest adjusting device for reclining seat - Google Patents

Abstract

PURPOSE: To facilitate cleaning and a direction change by fitting tilt arms connected to pivotal shafts for the seat section of a backrest and connected to gas spring means at the lower ends, and coupling the connecting pins attached to their upper ends with the circular arc-shaped oblong holes of fitting brackets fixed to the side faces of the backrest. CONSTITUTION: Tilt arms 40 constituting a backrest adjusting device 100 are rotatably fitted at the side ends of pivotal shafts 223 pivotally supporting the frame of a backrest 220 on the frame of a seat section 210 side, and backrest angle adjusting/holding gas spring means 100a are connected to the lower ends. An operation lever 33 is attached on a rod side bracket 32 at the tip of a piston rod 30. The tilt arms 40 fitted on the side faces of the backrest 220 are connected to the head side brackets 34 of the gas spring means 100a by connecting pins, and connecting pins 41 coupled with the circular arc-shaped oblong holes 51 of fitting brackets 50 are attached to the upper ends. When the backrest 220 is pushed with a hand, it can be simply erected to the retreat tilt angle α.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backrest adjusting device for adjusting and holding a tilting angle of a backrest that constitutes a reclining seat, and more particularly to a backrest which can be held forward or tilted and has a space behind it. The present invention relates to a backrest adjusting device capable of securing a large amount.

[0002]

2. Description of the Related Art Passengers (users) can take a comfortable posture in vehicles such as Shinkansen or conventional limited express trains, automobiles for recreation, or intercity traffic or regular buses. The so-called reclining seat is used. This reclining seat is assembled so that the tilt angle of the backrest can be adjusted with respect to the seat on which the user is seated.However, in recent reclining seats, the backrest between the seat and the backrest is reduced. By interposing the gas spring means for adjusting and holding the backrest angle, and by operating the gas spring means for adjusting and holding the backrest angle, fixing the backrest at an arbitrary angular position,
Furthermore, it is possible to automatically return the backrest to the standing position.

The gas spring means for adjusting and holding the backrest angle, which has been adopted conventionally, basically encloses a high pressure gas of a predetermined pressure in a cylinder, and slidably inserts a piston serving as a piston rod. The piston divides the interior of the cylinder into two working chambers, a rod-side chamber and a head-side chamber, which are filled with the working fluid. An open / close valve is provided in the communication passage that connects the two working chambers, and the open / close valve is operated from the outside to change the relative position of the piston with respect to the cylinder. It is designed to expand and contract outside.

In the conventional backrest adjusting device equipped with such gas spring means, the base end of the cylinder and the outer protruding end of the piston rod are respectively mounted between the seat portion and the backrest by using mounting members. If the user opens the on-off valve and applies a predetermined external force to the backrest at the same time as the user opens the on-off valve, the backrest can be laid down to any position, and if the on-off valve is closed. The backrest is fixedly held in its arbitrary tilted position.

On the other hand, in order to automatically return the backrest reclined by the gas spring means for adjusting and holding the backrest angle to the original standing position, the gas spring means for adjusting and holding the backrest angle is provided. For example, in the case of a single cylinder type, a free piston may be slidably arranged in the working chamber located on the head side of the cylinder, and a part of the working chamber on the head side may be partitioned by this free piston as a gas chamber. It is being appreciated. That is, this gas chamber is preliminarily set to a high pressure, and when the opening / closing valve provided in the communication passage portion is opened, the head-side working chamber and the rod-side working chamber are communicated with each other so that the working fluid It allows free movement, and as a result, the piston rod is stretched by receiving a thrust force based on its effective sectional area and the enclosed gas so that the backrest is automatically raised.

By the way, a large number of reclining seats of this type are arranged in a vehicle having a limited space, with a fixed type in which the direction cannot be changed. Even a so-called variable-direction seat that rotates to change its direction has a limited space behind the backrest of each reclining seat. Therefore, in the reclining seat using the gas spring means for adjusting and holding the backrest angle as described above, the following various inconveniences will appear in the following cases.

(It is difficult to operate the previous one from the seated reclining seat) The operating levers required for reclining and returning the backrest are:
It is often provided on an armrest on both sides of the seat, a lower front portion of the seat, or the like so that a person sitting on the seat of the reclining seat can easily use it. On the other hand, if the backrest of this reclining seat is still reclining,
A person who intends to use a reclining seat located behind the reclining seat must sit in the seat through a narrowed passage due to the front, largely reclining backrest. In order to widen this narrow passage, the operating lever of the front reclining seat may be operated to raise the backrest, but the operating lever is out of reach of the user trying to sit on the rear reclining seat. There is no position.

(Because the passage in front of the reclining seat is narrow and it is difficult to clean it, etc.) The above is a problem when the passage in front of each reclining seat is cleaned. In other words, if the backrest of the reclining seat in front of the passage to be cleaned is still reclining, the passage becomes narrow and it becomes difficult to perform cleaning.

(Difficulty in direction change) Especially, when each reclining seat is a reclining seat and each backrest remains reclined, the backrest comes into contact with the side wall of the vehicle or the like during its rotation. Therefore, there is an inconvenience that it is necessary to operate the operation levers of all seats to restore each backrest to the standing state before trying to rotate.

[0010]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned actual situation of a reclining seat that employs the gas spring means for adjusting and holding the backrest angle as described above. The problem to be solved is to solve the inconvenience of the user due to the narrow passage and the difficulty of cleaning, and the difficulty of changing the direction in the variable direction seat.

That is, first of all, the object of the invention according to claim 1 is that the backrest having a narrow passage can be easily retracted forward to facilitate cleaning and direction change. A backrest adjusting device that can be performed is provided by a simple structure in which the backrest side mounting bracket is changed by using gas spring means having a general mounting bracket similar to the conventional one. .

The object of the inventions according to claims 2 to 4 is to achieve the object of the invention according to claim 1 as well as abnormal noise caused by the back and forth movement of the backrest. There is no occurrence, and the backrest is in a predetermined standing state,
Another object of the present invention is to provide a backrest adjusting device that can be automatically aligned and held in a further forward tilted state and has excellent operability or workability.

[0013]

In order to solve the above problems, the means adopted by the invention according to claim 1 will be described with reference to the reference numerals used in the embodiments. In a reclining seat 200 having a seat 210 on which a user sits and a backrest 220 that is assembled so that the tilt angle can be adjusted, the cylinder 10 is adjusted to hold the backrest 220 at an arbitrary tilted position. And a piston 20 assembled in the cylinder 10, a piston rod 30 which is integrated with the piston 20 and can freely expand and contract outside the cylinder 10, and an oil passage communicating the working chambers 11 and 12 in front of and behind the piston 20. On-off valve 21 provided inside
And a gas spring means 100a for holding and adjusting the backrest angle, which is interposed between the backrest 220 side and the frame of the seat 210, and a pivot 223 with respect to the seat 210 of the backrest 220 so as to be rotatable. A tilting arm 40 connected to the gas spring means 100a at its lower end;
A backrest having an arc-shaped elongated hole 51 with which a connecting pin 41 provided at the upper end of the tilting arm 40 is engaged, and a mounting bracket 50 fixed to a side surface of the backrest 220. Adjustment device 100 ".

That is, in the backrest adjusting device 100 according to the present invention, the gas spring means 100a for adjusting and holding the backrest angle (hereinafter also simply referred to as gas spring means) 100a and the backrest 220 are provided on the side surfaces. The tilting arm 40 rotatably provided on the pivot 223 of the backrest 220 is arranged between the mounting bracket 50 and the lower end of the tilting arm 40 is connected to, for example, the head side bracket 34 of the gas spring means 100a, The connecting pin 41 provided on the upper end of the tilting arm 40 is engaged with the arcuate elongated hole 51 of the mounting bracket 50. As a result, in the backrest adjusting device 100, the piston rod 30
In addition to the stroke range, the tilting range of the backrest 220 is increased within the length range of the arcuate elongated hole 51 of the mounting bracket 50 so that the backrest 220 can be retracted forward.

Further, the means adopted by the invention according to claim 2 is, in the backrest adjusting device 100 according to claim 1, the connection between the tilting arm 40 and, for example, the inner side of the mounting bracket 50 on the backrest 220 side. An elastic washer 52 is provided between the pin 41 and a portion in the vicinity thereof so as to provide appropriate resistance to relative displacement between the two. That is,
In the backrest adjusting device 100 according to claim 2,
Engagement of the tilting arm 40 and the mounting bracket 50 by the connecting pin 41 is performed via an elastic washer 52. The elastic washer 52 allows the tilting arm 4 to the arc-shaped elongated hole 51 of the mounting bracket 50.
A structure in which relative movement of the 0-side connecting pin 41 is performed in the presence of a certain amount of frictional force so that play between the tilting arm 40 and the mounting bracket 50 is eliminated to prevent generation of abnormal noise. Is.

Further, the means adopted by the invention according to claim 3 is the backrest adjusting device 10 according to claim 1 or claim 2.
0, the connecting pin 41 provided on the tilting arm 40
And a mounting bracket 50 on the backrest 220 side, spring means 53 for urging the backrest 220 in a direction of always leaning forward.
Is interposed. That is, in the backrest adjusting device 100, the connecting pin 41 is located at the rear end side of the arc-shaped elongated hole 51 of the mounting bracket 50 by the action of the spring means 53, and the connection pin 4 formed by the arc-shaped elongated hole 51.
The backrest 220 can always be held on the forward tilt side by the retracting tilt angle α beyond the set holding position by the gas spring means 100a in accordance with the movement allowable amount of 1.

The means adopted by the invention according to claim 4 is, in the backrest adjusting device 100 according to claim 1, the mounting bracket 50 on the backrest 220 side and a portion in the vicinity of the connecting pin 41 of the tilting arm 40. And backrest 220
The spring means 54 for urging the rearward tilting direction is provided. In other words, in this backrest adjusting device 100, the backrest 220 is always aligned and held at the set holding position by the gas spring means 100a by locating the connecting pin 41 on the front end side of the arcuate elongated hole 51 of the mounting bracket 50. Therefore, there is no back-and-forth rattling of the backrest 220 accompanying the forward and backward movement of the vehicle, and the backrest 220 is pushed to move the connecting pin 41 relative to the rear end side of the arc-shaped elongated hole 51 against the spring means 54. Backrest 220 by moving to
Can be forcibly moved forward by the retractable tilt angle α above the set holding position.

[0018]

The operation of each invention constructed as described above will be described.
The following is a description of how to use the reclining seat 200 having the above and how to divide the items.

(Regarding the backrest adjusting device 100 according to claim 1) In the reclining seat 200 having the backrest adjusting device 100, the backrest 220 before using the reclining seat 200 is in the fully extended state of the gas spring means 100a. Normally, the normal standing state shown in FIG. Here, a user who intends to use the reclining seat 200 is seated on the seat portion 210, and when he / she wants to recline the backrest 220, it is located at an operation handle provided on an armrest or the like. The operation lever 33 is operated to operate the cylinder 1 of the gas spring means 100a which constitutes the backrest adjusting device 100.
The piston 20 is allowed to move freely within zero. That is, when the operation handle is operated, the operation lever 33 interlocked with this is moved and the push rod 31 in the piston rod 30 is pushed, and as shown in FIG. Open / close valve 21
Is opened so that the rod-side chamber 11 and the head-side chamber 12 communicate with each other, and the piston 20 that bears the piston rod 30
Becomes freely movable in the cylinder 10.

In this state, if the user pushes the backrest 220 with his / her back against the thrust due to the pressure of the enclosed gas acting on the piston rod 30, the mounting bracket 5 provided on the side surface thereof.
0 pushes the connecting pin 41, and this connecting pin 41
Rotates the tilting arm 40 and pushes the cylinder 10. As a result, the head side chamber 12 of the cylinder 10 is subjected to a compression action, and the opening / closing valve 21 of the piston 20 is opened, so that the hydraulic fluid in the head side chamber 12 flows toward the rod side chamber 11 side of the cylinder 10 and As a result, the piston rod 30 enters the cylinder 10 and the length of the gas spring means 100a is shortened. Therefore, the backrest 220 that constitutes the reclining seat 200 can be tilted rearward within the range of the angle θ of (A) to (C) of FIG. 1, that is, it is reclined.

When the rearward tilting of the backrest 220 to the desired reclining position is completed, the user releases the operating handle. As a result, in the gas spring means 100a, the operating lever 33 and the operating rod 31 return from the open position of the open / close valve 21 shown in FIG.
Will be closed, and the communication between the rod side chamber 11 and the head side chamber 12 will be cut off. That is, the flow of the hydraulic fluid in the cylinder 10 is stopped, whereby the piston rod 30 is fixed to the cylinder 10,
As a result, the backrest 220 is fixed in its arbitrary tilt reclining position.

During the above-described series of operations, the connecting pin 41 provided on the tilting arm 40 normally moves in the arcuate elongated hole 51 of the mounting bracket 50 integrated with the backrest 220 due to the rearward tilting moment of the backrest 220. It is in contact with the front end side (the left end side in the drawing in FIG. 1), and is in a state of directly transmitting the force received from the backrest 220 to the cylinder 10 side via the tilting arm 40.

Now, the reclining seat 20 located behind the backrest 220 thus reclined.
A person trying to sit down against 0 or his backrest 2
If there are people trying to clean the aisle behind 20 and there are no people on the reclining seat 200 with the backrest 220 still reclining, these people will hold the backrest 220 in front of them. By pushing with, the backrest 220 up to the range of the retracting tilt angle α shown in FIG.
The backrest 220 can be easily erected. This is because the connecting pin 41 of the tilting arm 40 is slid backward by the arcuate elongated hole 51 of the mounting bracket 50 and can move until it is locked to the rear end side (the right end side in FIG. 1). Because it is done.

This also applies to the case where the backrest 220 is in the normal standing state shown in FIG. The backrest 220 in an upright position is not standing vertically with respect to the floor of the vehicle, but is usually slightly tilted backwards. That is, the connecting arm 221 is moved by the backward tilting moment about the pivot 223 due to the weight of the backrest 220.
The connecting pin 41 provided in the above is abutted on the front end side (the left end side in the drawing of FIG. 1) of the arcuate elongated hole 51 on the mounting bracket 50 side. Therefore, if the backrest 220 is pushed by hand, it can be easily tilted forward to the retracted position from the state (a) in FIG. 1 to the state (b).

By the way, in the backrest adjusting apparatus 100 according to the embodiment described below, the free piston 13 is housed in the cylinder 10 to form the high-pressure gas chamber 14, so that the user If the open / close valve 21 of the piston 20 is opened by operating the operation handle provided on the armrest or the like without applying a pressing force to the backrest 220, the effective pressure of the piston rod 30 is received by the pressure in the gas chamber 14. The piston 20 is moved to the left in the drawing in FIG. 2 by receiving the thrust corresponding to the area, and the piston rod 30 extends relatively to the cylinder 10. As a result, in the reclining seat 200 including the backrest adjusting device 100, the backrest 22
0 automatically stands up and returns from the arbitrary reclining position shown by θ in FIG. 1 to the position shown in (a).

(Regarding the backrest adjusting device 100 according to claim 2) The basic features of this backrest adjusting device 100 are the same as those according to claim 1 except for the following points. That is, in the backrest adjusting device 100, the connecting pin 41 on the tilting arm 40 side and the backrest 2 are provided.
Since the elastic washer 52 is interposed between the mounting bracket 50 on the 20 side and the mounting bracket 50 as shown in FIG. 3, an appropriate frictional force is applied between the connecting pin 41 and the mounting bracket 50 by the elastic washer 52. It has been done.

This type of reclining seat 200 is
Since the vibration of the vehicle is transmitted because it is installed in the vehicle, if there is looseness in the engagement between the connecting pin 41 and the mounting bracket 50, a difference between them due to the vibration is generated. Will produce a sound. However, in the backrest adjusting device 100 of the present invention, the elastic washer 5
Since an appropriate frictional force is applied between the connecting pin 41 and the mounting bracket 50 by 2, the abnormal noise due to the vibration is not generated at all.

(Regarding the backrest adjusting device 100 according to claim 3) Also in this backrest adjusting device 100, the same operation as the backrest adjusting device 100 according to claim 1 or 2 is made except for the following points. It is what makes up. That is, in this backrest adjusting device 100, as shown in FIG. 4, between the connecting pin 41 on the tilting arm 40 side and the backrest 220, the spring means for constantly urging the backrest 220 in the direction of inclining the backrest 220 forward. Since 53 is interposed, the backrest 220 of the reclining seat 200 in which the passenger is not seated is always tilted forward by the retracted tilt angle α from an arbitrary tilted reclining position by the action of the spring means 53. is there. In other words, this reclining seat 2
In 00, the backrest 220 is automatically held from the maximum standing position (a) to the retracted forward leaning state shown in (b) of FIG. 1, so that the reclining seat 200 must be occupied by a seated person. Therefore, a large passage space behind the backrest 220 is secured.

(Regarding the backrest adjusting device 100 according to claim 4) The basic features of the backrest adjusting device 100 are the same as those according to claim 1 except for the following points. That is, in the backrest adjusting device 100, as shown in FIG. 5, the backrest 220 is provided between the inside of the mounting bracket 50 on the backrest 220 side and the portion near the connecting pin 41 of the tilting arm 40. Since the spring means 54 for urging in the backward tilt direction is provided, the backrest 220 is biased in the backward tilt direction by the spring means 54. In other words, the spring means 54 suppresses the backlash of the backrest 220 so as to prevent abnormal noise, and the biasing force of the spring means 54 is biased to the backrest 220 in the rearward inclination direction. Therefore, even if there is a play in the connecting portion between the arcuate elongated hole 51 of the mounting bracket 50 and the connecting pin 41 on the backrest 220 side, the connecting pin 41 is always biased and the arcuate elongated hole 51.
Since it is held in contact with one end of the, no abnormal noise is generated.

Any of the above backrest adjusting devices 1
Also in 00, the backrest 220 can be easily formed in the retracted forward tilt position shown in FIG. 1B, so that the reclining seat 200 having the backrest adjusting device 100 is oriented in the direction. In the case of the variable seat, the entire rotation can be performed without any support, and the reclining seat 200 can be easily configured.

[0031]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A backrest adjusting device 100, which is an embodiment shown in the drawings, of the invention according to each claim as described above,
Each section will be described below separately. Since the backrest adjusting device 100 according to each invention has many parts common to its constituent members, common members are designated by the same reference numerals in the drawings, and description thereof will be omitted.

(Regarding the backrest adjusting device 100 according to claim 1) This backrest adjusting device 100 is shown in FIGS. 1 and 2, but this is applied before explaining the backrest adjusting device 100. An outline of the reclining seat 200 will be described. The reclining seats 200 are arranged in a vehicle in a large number at predetermined intervals, and a frame supporting the seat 210 is fixed on the floor of the vehicle. Installed. The seat 2
Various forms are applied to the frame 10 and the frame that supports the frame 10. For example, a directionally variable seat in which the seat 210 rotates with respect to the frame, or the seat 210 has a backrest 2.
For example, there is one that slides forward by reclining 20.

Of course, the backrest 220 is reclinably attached to the frame supporting the seat 210, and a part of the frame constituting the backrest 220 is part of the seat 210. It is pivotally supported by a pivot 223 with respect to the side frame. And this axis 223
A tilting arm 40 that constitutes the backrest adjusting device 100 is rotatably attached to the side end of the backrest adjusting device 100. At the lower end of the tilting arm 40, as shown in FIG. Spring means 100a is connected via a connecting pin.

The gas spring means 100a constituting the backrest adjusting device 100 according to the present embodiment is of a single cylinder type as shown in FIG. 2, for example, and the piston 20 carrying the piston rod 30 in the cylinder 10 is provided. Are fitted so as to slide in a liquid-tight manner. This piston 20
Therefore, the inside of the cylinder 10 is the rod side chamber 1 on the left side in the drawing.
1 and the head-side chamber 12 on the right side in the drawing, and the rod-side chamber 11 and the head-side chamber 12 are filled with hydraulic fluid. In the gas spring means 100a, the free piston 13 is hermetically fitted in the cylinder 10 on the right side of the head side chamber 12, and the gas chamber 14 formed by the free piston 13 on the right side of the drawing. The inside is filled with high-pressure gas.

Further, an opening / closing valve 21 for connecting or disconnecting the rod side chamber 11 and the head side chamber 12 is provided in a part of the piston 20, and the opening / closing valve 2
1 is a push rod 3 that is inserted into the piston rod 30 and has one end protruding from the outer end of the piston rod 30.
It is connected to 1. A rod side bracket 32 rotatably connected to the seat portion 210 or a frame side supporting the seat portion 210 is attached to the tip end side of the piston rod 30, and the rod side bracket 32 includes the reclining seat 200. An operation lever 33 operated by an operation handle (not shown) provided on an armrest or the like is provided.
That is, when the user operates the operation handle provided on the armrest or the like, the operation lever 3 that is interlocked with this is operated.
3 is operated, and the push rod 31 is pressed by the operation of the operation lever 33 to open the opening / closing valve 21.

The outside of the cylinder 10 in the single cylinder type gas spring means 100a as described above is shown in FIG.
As shown in FIG. 5, the head side bracket 34 having a general bracket shape is integrated, and the gas spring means 100a itself can be the same as the conventional one. The tilting arm 40 provided on the side surface of the backrest 220 that forms the reclining seat 200 is connected to the head-side bracket 34 via a connecting pin.

The tilting arm 40 is rotatably attached to a pivot 223 supporting the backrest 220, and its lower end is connected to the head side bracket 34 on the gas spring means 100a side. At the upper end thereof, there is provided a connecting pin 41 that engages in the arcuate elongated hole 51 of the mounting bracket 50 which is a feature of the present invention. Of course,
This tilting arm 40 is used for the reclining seat 20.
It is covered with a side plate of 0 or a cover material of the backrest 220, etc., so that clothes or the like are not caught when it is tilted.

As shown in FIGS. 1 and 3, the mounting bracket 50 according to the present invention mounted on the side surface of the backrest 220 has an arc-shaped elongated hole 51 centered on the pivot 223 at the substantially central portion thereof. This is an arc-shaped elongated hole 51
The connecting pin 41 on the tilting arm 40 side is engaged therein. In addition, the mounting bracket 5 according to the present embodiment
As shown in FIG. 3, 0 has its upper end attached to the side surface of the backrest 220 with a screw 55, so that the upper end of the tilting arm 40 is inside the attachment bracket 50, that is, In order to make the portion in which the arc-shaped elongated hole 51 is formed slightly protrude forward, the whole is bent so that the side surface has a crank shape.

The gas spring means 100a is not limited to a single cylinder type, but may be a double cylinder type in which the communicating passages of the working chambers in front of and behind the piston are formed by an outer cylinder which is concentrically combined with a cylinder. Further, in order to suppress the play of the connecting pin 41 in the arcuate elongated hole 51, a pressing spring may be interposed between the connecting pin 41 and the mounting bracket 50, as described later.

(Regarding the backrest adjusting device 100 according to claim 2) This backrest adjusting device 100 has the same basic structure as that of the above-mentioned claim 1, but as shown in FIG. When assembling the connecting pin 41 on the arm 40 side into the arc-shaped elongated hole 51 of the mounting bracket 50,
The difference is that the elastic washer 52 is interposed.

That is, in the backrest adjusting apparatus 100 according to the second aspect of the present invention, for example, the elastic washer 52 formed of an elastic body made of a leaf spring, rubber, or resin is fitted on the connecting pin 41. The elastic washer 52 is arranged so that most of the elastic washer 52 is inside the portion of the mounting bracket 50 in which the arcuate elongated hole 51 is formed, and is interposed between this portion and the upper end of the mounting bracket 50. It is a thing.

The elastic washer 52 is used for the tilting arm 4
When the connecting pin 41 integrated with 0 moves in the arc-shaped elongated hole 51 of the mounting bracket 50, it produces an appropriate frictional force with the inner surface of the mounting bracket 50. It also absorbs the looseness of the assembly of the mounting bracket 51 and the mounting bracket 50.

(Regarding the backrest adjusting device 100 according to claim 3) In this backrest adjusting device 100, as shown in FIG. 4, an interposition is provided between the connecting pin 41 on the tilting arm 40 side and the mounting bracket 50. Except for the structure of the spring means 53 described above, the spring means 53 has exactly the same structure as that of the above-described claim 1 or 2.

That is, the spring means 53 is
The urging force is applied to the backrest 220 through the mounting bracket 50 in the direction in which the backrest 220 is always raised about three times, and the elastic force shown in the embodiment is applied as long as it exerts such an action. It may be the "torsion spiral spring" used, or it may be a compression spring or a tension spring. In the case where the spring means 53 is the “torsion spiral spring” shown in FIG. 4, the spiral part is inserted into the pivot 223, one end is hooked on the connecting pin 41, and the other end is mounted. It suffices to hang the lock pin 53a fixed to the mounting bracket 50 side.

According to the backrest adjusting device 100 having such spring means 53, the normal standing state in the case where the spring means 53 is not provided (state (a) in FIG. 1).
To the state of (b) in FIG. 1 which is the forward leaning state, the backrest 2
It is of course possible to automatically keep the forward tilt of the 20 at all times, and of course, when the user leaves the backrest 220 in the completely reclining state as shown in FIG. This backrest 220 can always be automatically raised by the retractable tilt angle α shown in FIG.

(Regarding the backrest adjusting device 100 according to claim 4) This backrest adjusting device 100 has the same basic structure as that of the above-mentioned claim 1, but as shown in FIG. A different point is that the spring means 54 is interposed when the connecting pin 41 on the leaning 220 side is assembled into the arcuate elongated hole 51 of the mounting bracket 50. That is,
The spring means 54 urges the backrest 220 around the pivot 223 in the backward tilting direction between the inside of the mounting bracket 50 on the backrest 220 side and a portion near the connecting pin 41 of the tilting arm 40. The backrest 22 provided with 54
0 is always urged in the backward tilting direction, and a "torsion spiral spring" using the elastic force shown in the embodiment may be used as long as it exerts such an action. Alternatively, it may be a tension spring.

When the spring means 54 is a "torsion spiral spring" as shown in FIG. 5, its spiral part is inserted into the pivot 223 and one end thereof is hooked on the connecting pin 41. At the same time, attach the other end to the mounting bracket 5
It suffices to hang it on the locking pin 54a fixed to the 0 side.

In other words, in the backrest adjusting device 100, the spring means 54 urges the connecting pin 41 to the front end side of the elongated hole 51 of the mounting bracket 50, so that the backrest 220 is moved. The backrest 220 is always aligned and held at the set holding position to eliminate the backlash in the back and forth direction of the backrest 220 due to the forward and backward movement of the vehicle. Moreover, backrest 2
By pushing 20 to move the connecting pin 41 to the rear end side of the elongated hole 51 against the spring means 54, the backrest 220 is moved forward by the retractable tilt angle α above the set holding position. It is designed so that it can be forcibly moved.

[0049]

As described above in detail, in the invention according to claim 1, as illustrated in the above-mentioned embodiment, "the seat 210 which is installed in the vehicle and on which the user sits, and In the reclining seat 200 having the backrest 220 assembled so that the tilt angle can be adjusted, the backrest 22
In order to adjust and hold 0 in any tilted position, the cylinder 10
A piston 20 assembled in the cylinder 10; a piston rod 30 which is integrated with the piston 20 and is capable of expanding and contracting outside the cylinder 10;
Gas spring means 100a for adjusting and holding the backrest angle, which is integrated with the outside of the cylinder 10 and has a piston rod 30 which can freely expand and contract, and is interposed between the backrest 220 side and the frame of the seat 210. And rotatably connected to a pivot 223 with respect to the seat 210 of the backrest 220,
It has a tilting arm 40 whose lower end is connected to the gas spring means 100a and an arcuate elongated hole 51 with which a connecting pin 41 provided at the upper end of the tilting arm 40 is engaged, and is fixed to the side surface of the backrest 220. It is possible to easily perform a receding forward tilting of the backrest that narrows the passage for cleaning and direction. A gas spring means 100 having a general mounting bracket similar to the conventional one, which has a backrest adjusting device capable of easily performing conversion.
It can be provided by a simple configuration in which the backrest side mounting bracket is changed using a.
The gas spring means 100a itself has an effect that a general-purpose product can be used.

Further, in the invention according to claim 2, in the backrest adjusting device 100 according to claim 1, the inside of the mounting bracket 50 on the backrest 220 side and the connecting pin 41 of the tilting arm 40 are further provided. The elastic washer 52, which gives appropriate resistance to the relative displacement of the two, is interposed between the adjacent portion and the adjacent portion, which is a characteristic feature of the structure, and thereby the backrest adjusting device according to claim 1 above. 1
In addition to being able to exert the same effect as 00, backrest 22
The 0-side mounting bracket 50 and the connecting pin 41 on the tilting arm 40 side can be connected without play.
As a result, the backrest adjustment device 100 can be provided in which the back-and-forth movement of the backrest 220 is suppressed and no abnormal noise is generated.

Further, according to the invention of claim 3, the same effect as that of the backrest adjusting device 100 according to claim 1 or 2 can be exhibited, and the backrest 220 can be raised or tilted forward. The backrest 220 can be automatically moved to a state without touching the backrest 220, and the backrest adjusting device 100 with good operability can be obtained.

According to the invention of claim 4, the same effects as those of the backrest adjusting device 100 according to claim 1 can be exhibited, and no abnormal noise is generated by the back and forth movement of the backrest. Moreover, a backrest adjusting device that can automatically hold the backrest in a predetermined standing state or can be forcibly retracted to a further forward leaning state and has very good operability or workability is provided. Can be provided.

[Brief description of drawings]

FIG. 1 is a side view of a reclining seat in which a gas spring means for adjusting and holding a backrest angle according to a first aspect of the present invention is assembled.

FIG. 2 is an enlarged cross-sectional view of a gas spring means constituting a backrest adjusting device according to the present invention, which is a side view of a reclining seat.

FIG. 3 shows a backrest adjusting device according to claim 2,
FIG. 2 is a partially enlarged cross-sectional view taken along a portion corresponding to line 1-1 in FIG. 1.

FIG. 4 is a partial enlarged side view showing a main part of a backrest adjusting device according to a third aspect of the present invention, showing a mounting bracket having an arc-shaped elongated hole as a center.

FIG. 5 is a partial enlarged side view showing a main part of a backrest adjusting device according to a fourth aspect of the present invention, showing a mounting bracket having an arc-shaped elongated hole as a center.

[Explanation of symbols]

 100 backrest adjusting device 100a gas spring means 10 cylinder 11 rod side chamber 12 head side chamber 13 free piston 14 gas chamber 20 piston 21 opening / closing valve 30 piston rod 31 operating rod 32 rod side bracket 33 operating lever 40 tilting arm 41 connecting pin 50 mounting bracket 51 arcuate long hole 52 elastic washer 53 spring means 54 spring means 200 reclining seat 210 seat 220 backrest 223 pivot

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[Procedure amendment]

[Submission date] August 8, 1995

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 1

[Correction method] Added

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FIG.

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 2

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[Fig. 2]

[Procedure 3]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 3

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[Figure 3]

[Procedure amendment 4]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 4

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[Figure 4]

[Procedure Amendment 5]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 5

[Correction method] Added

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[Figure 5]

Claims (4)

[Claims] 1. A reclining seat having a seat portion which is installed in a vehicle and on which a user sits, and a backrest which is assembled so that a tilt angle can be adjusted with respect to the seat portion, wherein the backrest has an arbitrary tilt angle position. In order to adjust and hold the cylinder, a piston assembled in the cylinder, a piston rod that is integrated with the piston and can freely expand and contract outside the cylinder, and an oil passage that communicates the working chambers before and after the piston. An on-off valve provided therein, and a gas spring means for adjusting and holding a backrest angle, which is interposed between the backrest side and a frame of the seat portion, and a pivot for the seat portion of the backrest. The tilting arm is rotatably connected and has a lower end connected to the gas spring means, and an arcuate elongated hole with which a connecting pin provided at an upper end of the tilting arm is engaged. Backrest adjustment device characterized by comprising a mounting bracket which is fixed to the side surface. 2. An elastic washer is provided between the mounting bracket and a portion of the tilting arm in the vicinity of the connecting pin of the tilting arm, the elastic washer providing appropriate resistance to relative displacement between the two. 1. The backrest adjusting device according to 1. 3. A spring means for urging the backrest in a direction in which the backrest is always tilted forward is interposed between the connecting pin provided on the tilting arm and the mounting bracket. The backrest adjusting device according to claim 2. 4. A spring means for urging the backrest in a backward tilting direction is interposed between the mounting bracket and a portion of the tilting arm near the connecting pin. The backrest adjustment device described.