JPH0692228A - Backrest reclining type seat - Google Patents

Abstract

PURPOSE:To dispose a seat part interlocked with a backrest in a comfortable position for improving a sitting feeling either in small or large reclining angle of the backrest. CONSTITUTION:A movable frame 18 of a seat part 7 is supported on a seat frame 5 slidably back and forth. An operative shaft 27 is provided pivotably on the rear end of the movable frame 18 and a cam plate 28 and lever 34 are fixed on the operative shaft 27. The lever 34 is connected through a link 36 to the movable frame 18. A cam driving pin 32 is provided to project from an arm member 12 of a backrest 6 and engaged with a locking cam part 29 in the early reclining angle range of the backrest 6 for pivoting the cam plate 28 and moving the seat part 7 from a retreating end position to an advancing end position through the lever 34 and link 36. In the remaining reclining angle range of the backrest 6, the cam driving pin 32 engages the locking cam part 29, so that the cam plate 28 is not pivoted in both directions and the seat part 5 is stopped and held at the advancing end position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backrest tilting type seat installed in vehicles such as railroad cars, buses, ships and other places, and more particularly, to an interlocking mechanism for interlocking the seat portion with the backrest. It relates to improved technology.

[0002]

2. Description of the Related Art In a rotary type variable direction seat to be mounted on a railway vehicle or the like, the radius of gyration increases as the seat length is increased or the backrest is inclined rearward. It becomes easier to hit the seat. Therefore, there is a problem in that the pitch between the seats must be increased, the number of seats is reduced, and the passenger capacity is reduced. Therefore, while forming the front and back length of the seat part smaller than usual,
A backrest tilting type seat, in which the backrest is raised when the seat is rotated, to reduce the radius of rotation and thus the pitch between the seats, is considered.

In this backrest tilting type seat, the seat portion is located at the retracted end when the backrest is in the standing position, but when the backrest is tilted rearward from the standing position, the seat portion is interlocked with the seat portion. By moving forward, the depth of the seat (the depth from the front end of the seat to the backrest. The same applies hereinafter) is increased to compensate for the small front-rear length of the seat to ensure a comfortable seat. There is. This backrest tilting type seat is provided with a backrest that can be tilted back and forth, a seat that can slide back and forth, and an interlocking mechanism that links the seat to the backrest. Then, the conventional interlocking mechanism is configured to slide the seat portion by a movement amount proportional to the tilt angle of the backrest.

[0004]

However, according to the conventional interlocking mechanism, when the tilting angle of the backrest is small, the amount of movement of the seat portion also decreases in proportion thereto, so that the depth of the seat portion tends to be insufficient. There was a problem that I was dissatisfied with my sitting comfort. However, if you set a large amount of movement of the seat at this time so that you will not be dissatisfied, when the backrest is tilted to the maximum tilt angle, the amount of movement of the seat will increase in proportion to it, There is a problem that a large gap is formed between the rear end of the seat portion and the lower end of the backrest, which rather deteriorates the sitting comfort.

Therefore, an object of the present invention is to provide a seat with a sufficient depth even if the backrest tilt angle is small, and to provide a seat with a large backrest tilt angle. (EN) Provided is a novel backrest tilting type seat, which can prevent a large sitting gap from being formed between the rear end of the rear portion and the lower end of the backrest so as to prevent deterioration in sitting comfort.

[0006]

In order to solve the above-mentioned problems, a backrest tilting type seat according to the present invention has a backrest tiltable forward and backward, a seat portion slidable forward and backward, and a seat portion backed. An interlocking mechanism for interlocking with the backrest is provided, wherein the interlocking mechanism moves the seat portion from the backward end position to the forward end position within the initial tilting angle range from the upright position of the backrest to the remaining tilting angle range of the backrest. Is configured to hold the seat portion at the forward end position.

Examples of the "interlocking mechanism" include a cam mechanism provided between the backrest and the seat portion, a link mechanism, a gear mechanism, a clutch mechanism, or a mechanism combining them.

[0008]

According to the backrest tilt-type seat of the present invention, the interlocking mechanism moves the seat portion from the backward end position to the forward end position within the initial tilting angle range from the standing position of the backrest to the rear. Even if the tilting angle of is small, the seat part is sufficiently advanced. Therefore, it is possible to improve the sitting comfort by making the depth of the seat portion sufficient. Further, since the seat portion is held at the advance end position in the range of the remaining tilt angle of the backrest, the seat portion does not further advance even if the tilt angle of the backrest is increased. Therefore,
There is no concern that a large gap will be formed between the rear end of the seat portion and the lower end of the backrest, and it is possible to prevent deterioration of sitting comfort.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is embodied in a backrest tilt type seat for a railway vehicle will be described below with reference to the drawings. Figure 1
In the figure, 1 is a seat unit for three persons, and a plurality of seat units are arranged in parallel at a predetermined pitch P in the traveling direction of the railway vehicle. This pitch P is normally about 1040 mm, but in this embodiment, it is set to about 980 mm, which is smaller than this. Each seat unit 1 is provided with three backrest tilting type seats 2 and is configured to be capable of changing direction around a central axis 3.

In FIG. 2, 4 is an underframe of the seat unit 1, 5 is a seat frame rotatably supported by the underframe 1, and the backrest tilting type seat 2 is installed on the seat frame 5. . Each backrest tilting type seat 2 is provided with a backrest 6 that can be tilted back and forth, a seat portion 7 that can slide back and forth, and an armrest 8. The armrest 8 locks the backrest 6 when the backrest 6 tilts. A push button 9 for releasing is provided. A foot pedal 10 disengages the seat frame 5 from the underframe 4 when the seat unit 1 is changed in direction.

As shown in FIGS. 3 and 4, the backrest 6 is provided with a pair of left and right arm members 12, and the link portion 1 is provided below the arm members 12.
3 are integrally formed. A vertical frame 14 is erected on the seat frame 5 at a position corresponding to each arm member 12, and the arm member 12 is supported by the vertical frame 14 at a link portion 13 so as to be tiltable by a fulcrum shaft 15. A gas cylinder 16 having a stepless lock mechanism is connected to the lower end of the link portion 13 so that the backrest 6 can be continuously locked at any tilted position while being biased forward. .

The seat portion 7 is provided with a movable frame 18 in the shape of a square quadrangular plate, and grooved guide plates 19 are attached to the four corners of the lower surface thereof. Rolling balls 20 are provided on the seat frame 5 at positions corresponding to the grooved guide plates 19, and the movable frame 18 is moved forward and backward relative to the seat frame 5 by the rolling balls 20 via the grooved guide plates 19. It is slidably supported. Stopper screws 21 are attached to the left and right sides of the movable frame 18, and a rubber stopper 22 is fixed to the seat frame 5 so as to face the stopper screw 21 from the front. Between the movable frame 18 and the seat frame 5, a spring 23 that urges the seat portion 7 rearward is stretched.

A pair of left and right brackets 25 are attached to the upper surface of the rear end portion of the seat frame 5, and a cylindrical portion 26 is horizontally fixed to the upper end of each bracket 25. An operating shaft 27 is rotatably inserted into each cylindrical portion 26, and the cam plate 2 is attached to one end thereof.
8 is welded. The cam plate 28 is formed in a substantially fan shape, and a concave locking cam portion 29 and a gently curved holding cam portion 30 are continuously formed on the lower edge thereof. A mounting plate 31 is fixed to the link portion 13 of the arm member 12 on the side corresponding to the cam plate 28, and the cam portions 29, 3 are attached to the lower portion thereof.
A cam drive pin 32 that engages with 0 is provided in a protruding manner. Then, the cam drive pin 32 is moved back and forth around the fulcrum shaft 15 integrally with the arm member 12, and the operating shaft 27 is rotated in a state of being engaged with the locking cam portion 29 to be engaged with the holding cam portion 29. In this state, the operating shaft 27 is not rotated.

Inside the cylindrical portion 26, a pair of left and right levers 34 are welded on the operating shaft 27 at the upper end, and a long hole 35 is formed at the lower end. Two links 36 are projectingly provided on the rear end surface of the movable frame 18 so as to sandwich each lever 34, and the projecting ends are connected to the elongated holes 35 of the lever 34 via pins 37. The cam plate 28, the cam drive pin 32, the lever 34, and the link 36 constitute an interlocking mechanism 38 of the present embodiment, and the interlocking mechanism 38 causes the backrest 6 to rise from the standing position as shown in FIG. In the rearward tilting angle range θ1, the seat 7 is moved from the backward end position to the forward end position (two-dot chain line position), and in the residual tilting angle range θ2 of the backrest 6, the seat 7 moves forward. It is designed to be held at the end position. In this embodiment, the initial tilt angle range .theta.1 is 11 DEG and the residual tilt angle range .theta.2 is 20 DEG, so that the total tilt angle .theta. Is set to 31 DEG.

Next, the operation of the backrest tilting seat of the present embodiment constructed as described above will be described. When the backrest 6 is tilted, the push button 9 of the armrest 8 is pushed to release the stepless locking mechanism of the gas cylinder 16, and the backrest 6 can be tilted to any angle by pushing it backward by hand. Then, when the finger is released from the push button 9, the stepless lock mechanism operates and the backrest 6 is locked at the tilted position. Further, when the foot pedal 10 is depressed when changing the direction of the seat unit 1,
The stepless lock mechanism is released via a wire (not shown),
The urging force of the gas cylinder 16 tilts the backrest 6 forward to the standing position.

The interlocking action of the backrest 6 and the seat portion 7 during this tilting operation will be described in detail. As shown by the solid line in FIG. 2, the backrest 6 is in a substantially vertical standing position (tilt angle = 0 °). At some point, the seat 7 is located at the retracted end position. The depth D0 of the seat portion 7 at this time is normally about 440 mm,
In this embodiment, it is set to 405 mm, which is smaller by 35 mm. On the other hand, in the interlocking mechanism 38, as shown in FIG. 5A, the cam drive pin 32 is fitted into the locking cam portion 29 of the cam plate 28, and the lever 34 is held at the rear rotation end position. The movable frame 18 is arranged at the retracted end position via the link 36.

When the backrest 6 is tilted rearward from this state, as shown in FIG. 5B, the initial tilt angle range θ1.
Then, the cam drive pin 32 is moved forward in accordance with the tilting of the arm member 12 (illustrated by a two-dot chain line in FIG. 5), and the cam plate 28 is caused by the engagement of the cam drive pin 32 and the locking cam portion 29.
The operating shaft 27 and the lever 34 are integrally rotated. Then, the link 36 is pushed forward by the lever 34, and the movable frame 18 is slid from the backward end position to the forward end position against the biasing force of the spring 23. In this embodiment, the sliding amount S of the movable frame 18 is set to 35 mm, and therefore,
The depth D1 of the seat 7 at this time is 440 mm (see FIG. 2).
reference). Therefore, even when the backrest 6 is tilted at a small angle, the depth D1 of the seat portion 7 can be sufficiently secured and the sitting comfort can be improved.

The backrest 6 is the end of the initial tilting angle range θ1 (1
When tilted up to 1 °), the cam drive pin 32 comes out of the locking cam portion 29 and is positioned on the extension curve of the holding cam portion 30. When the backrest 6 is further tilted rearward from this state, the cam drive pin 32 engages with the holding cam portion 30 in the residual tilt angle range θ2 as shown in FIG. The reverse rotation of the plate 28 is restricted. Further, since the cam drive pin 32 moves along the holding cam portion 30, the cam plate 28 is not rotated in the residual tilt angle range θ2. Therefore, the movable frame 18 is not slid forward and backward, and is stopped and held at the forward end position. Therefore, even when the backrest 6 is tilted to the maximum tilt angle (31 °), the position of the seat 7 does not change, and a large gap is not formed between the rear end of the seat 7 and the lower end of the backrest 6. In this way, it is possible to prevent deterioration of sitting comfort. When the backrest 6 is returned and tilted forward, the movable frame 18 is smoothly retracted to the normal position by the interlocking mechanism 38 according to the biasing force of the spring 23 in the initial tilting angle range θ1.

The present invention is not limited to the above-mentioned embodiment, and is applied to, for example, a backrest tilt type seat for a gear, an interlocking mechanism for one person or two persons, or a bus. For example, the shape and configuration of each part can be appropriately changed and embodied without departing from the spirit of the present invention.

[0020]

As described in detail above, according to the present invention,
Since the seat part is moved from the backward end position to the forward end position within the initial range of the backrest tilt and the seat part is held at the forward end position within the residual tilt angle range of the backrest, tilting of the backrest is possible. Even if the angle is small, the seat can be comfortably seated with a sufficient depth, and even if the tilt angle of the backrest is large, there is a large gap between the rear end of the seat and the lower end of the backrest. With this, it is possible to prevent deterioration of the sitting comfort by exerting an excellent effect.

[Brief description of drawings]

FIG. 1 is a plan view of a backrest tilting type seat according to an embodiment of the present invention.

FIG. 2 is a side view of the same back tilting seat.

FIG. 3 is a cross-sectional view showing the interlocking mechanism of the backrest tilting seat from the front side.

FIG. 4 is a cross-sectional view showing the interlocking mechanism from the side surface side.

FIG. 5 is an operation explanatory view of the interlocking mechanism.

[Explanation of symbols]

2 Backrest tilting seat 5 Seat frame 6 Backrest 7 Seat 18 Movable frame 28 Cam plate 32 Cam drive pin 34 Lever 36 Link 38 Linkage mechanism θ1 Initial tilt angle range θ2 Residual tilt angle range

Claims (1)

[Claims] 1. A backrest that can tilt back and forth, a seat that can slide back and forth, and an interlocking mechanism that interlocks the seat with the backrest, wherein the interlocking mechanism moves backward from a standing position of the backrest. Is configured to move the seat portion from the backward end position to the forward end position within the initial tilt angle range of, and to hold the seat portion at the forward end position within the residual tilt angle range of the backrest. Tilting seat.