JP3272123B2 - Variable directional seats for vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle seat installed on a railway vehicle, a bus, a ship, etc., and more particularly to a vehicle configured to automatically change a seating direction by rotating a seat frame by a motor. The present invention relates to a variable direction seat.

[0002]

2. Description of the Related Art Conventionally, in railway car seats,
There has been proposed a technique for automatically rotating a large number of seats simultaneously in the traveling direction. On the other hand, some railcar seats have a backrest tilting mechanism. When the seat is rotated with the backrest at the reclining position, the upper end of the backrest easily hits the front and rear seats. Therefore, there has been proposed a backrest tilting mechanism configured to release the lock member of the reclining mechanism prior to the rotation of the seat and return the backrest from the reclining position to the normal position in front.

[0003]

However, according to the conventional variable-direction seat, the backrest is inclined backward by several degrees to several tens degrees even in the normal position, so that the turning radius of the upper end of the backrest is reduced. The rotation radius of the frame is larger than the rotation radius of the frame, and the pitch between the front and rear seats needs to be set large according to the rotation radius of the upper end of the backrest. In addition, since the conventional backrest tilting mechanism uses a reclining mechanism, it can be applied to a seat without a reclining function, that is, a vehicle seat that uses a backrest in a fixed position. Did not.

[0004] Therefore, an object of the present invention is to rotate the upper end of the backrest during rotation of the seat by using a backrest tilting mechanism different from the reclining mechanism, whether or not the seat has a reclining mechanism. It is an object of the present invention to provide a new variable-direction vehicle seat capable of reducing the radius and thereby minimizing the pitch between the front and rear seats so that a large number of seats can be installed in a limited space.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a variable-direction seat for a vehicle according to the present invention includes a base fixed to a floor of the vehicle, and a seat rotatably provided on the base. A frame, a motor that drives and rotates the seat frame, a backrest that is tiltably supported between the normal position inclined rearward on the seat frame and a retracted position ahead of the frame, and rotation of the backrest by rotating the seat frame. A backrest tilting mechanism for initially tilting from the normal position to the retracted position and returning to the normal position from the retracted position at the end of rotation of the seat frame,
The backrest tilting mechanism includes a cam provided on a base, a cam follower supported on a seat frame so as to engage with the cam, a connecting member for connecting the cam follower and the backrest, and a backrest directed to a retracted position.
And a first biasing member for biasing the seat frame.
During the period, the backrest is in the standby position with the help of the urging force of the first urging member.
It was made to tilt to the position. Also, this back tilting mechanism
Is a cam with a gentle slope provided on the side of the base,
The side of the seat frame as it descends and rises along the cam slope
The cam follower and the back
A connecting member to tie the backrest toward the retracted position;
It is preferable to configure the first biasing member.

[0006] The spine rest tilt mechanism can preferably comprise a second biasing member for urging the normal position the spine rest waiting avoid position by a weak force than the first biasing member.

[0007]

When the seat frame is rotated by the motor in the vehicle direction variable seat according to the present invention, the backrest tilting mechanism is actuated in conjunction therewith, and the backrest is cam-followed and connected by the cam during rotation of the seatframe. It is arranged at a retracted position ahead of the normal position via a member. For this reason, the turning radius of the upper end of the backrest is reduced, and the pitch between the front and rear seats can be reduced accordingly, and a large number of seats can be installed in a limited space. In addition, since the back tilting mechanism includes the cam, the cam follower, and the connecting member and is configured separately from the reclining mechanism, the present invention can be applied regardless of whether the seat has the reclining mechanism.

Further, since the first biasing member of the backrest tilting mechanism biases the backrest toward the retreat position, the first rotation of the seat frame can be performed at an early stage of rotation of the seat frame.
The backrest is tilted to the standby position with the help of the urging force.
On the other hand, since the second urging member urges the backrest toward the normal position with a weaker force than the first urging member, the difference between the urging forces of the two urging members during the rotation of the seat frame causes the backrest to move. Is held at the standby position, and at the end of rotation of the seat frame, the backrest is returned to the normal position with the help of the urging force of the second urging member. Therefore, the tilting power of the backrest that the motor bears can be reduced, and the seat frame can be rotated and the backrest can be tilted with a relatively small motor.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is embodied in a variable direction seat for a railway vehicle will be described below with reference to the drawings. Figure 1
As shown in FIG. 3, the direction variable seat 1 of the present embodiment includes a base 2 installed on a floor F of a railway vehicle. A seat frame 3 for three people is rotatably supported on the base 2, and a motor 4 for driving the seat frame 3 is installed inside the base 2. Rollers 5 are provided at both ends of the base 2, and guides 6 are fixed to lower surfaces of both ends of the seat frame 3, and the seat frames 3 are fixed to the base 2 within an angle range in which the guides 6 are engaged with the rollers 5. Is held horizontally.

An armrest 8 and a lock lever 9 for locking the seat frame 3 at a position aligned with the base 2 are provided at the passage-side end of the base 2.
And a foot pedal 10 for operating the lock lever 9 to the release position when the seat is manually rotated. The lock lever 9 is also connected to the motor 4 via a wire 11, and is automatically rotated to the release position by the motor 4 prior to automatic rotation of the seat. The armrest 8 is fixed to the base 2 via a bracket 12.

The seat frame 3 has three seats 15 formed by four pillars 14 and a single backrest 16 common to each seat 15. The backrest 16 is provided with four arms 17, each arm 17 being connected to the column 14 by a shaft 18, and the backrest 16 being inclined with respect to the seat frame 3 by approximately 21 ° rearward from the vertical line. (See Fig. 1)
And a retracted position (see FIG. 2) inclined forward by about 3 ° from the vertical line. The seat 15 and the backrest 16 are each provided with a cushion (not shown).

As shown in FIGS. 3 to 5, a projection 20 for engaging the lower front surface of the arm 17 is fixed to each column 14, and the inner two columns 14 are attached to the lower rear surface of the arm 17. The engaging slide pin 21 is penetrated, and the projections 20 and the slide pin 21 allow the backrest 1 in the normal position.
6 is held so that it cannot tilt forward and backward. Slide pin 2
Reference numeral 1 is connected to the lock lever 9 via a wire 22 so that the seat 1 can be sunk into the support post 14 in conjunction with the lock lever 9 and allow the backrest 16 to tilt forward when the seat is automatically and manually rotated. It has become.

As shown in FIGS. 1 to 3, a base 2 and a seat frame 3 are provided.
Is provided with a back tilting mechanism 24. The back tilting mechanism 24 includes a cam 25, a cam follower 26, and a swing plate 2.
7. First link 28, lever 29, and second link 30
, And these members 25 to 30 are disposed on both the left and right ends of the base 2 or the seat frame 3, respectively. The cam 25 is formed in a gentle mountain shape, the cam 25 on the passage side is attached to the inner surface of the armrest 8, the cam 25 on the wall W is attached to the tip of the horizontal rod 31, and both are fixed to the base 2. I have. The cam follower 26 is mounted on a swinging plate 27, and the swinging plate 27 is swingably supported on the seat frame 3 by a shaft 32. The cam follower 26 engages with the cam 25 and can be displaced up and down. I have. The cam 25 on the wall W side is
The cam follower 26 is formed in a U-shaped cross section so as not to be dissociated upward.

The lever 29 is rotatably supported on the seat frame 3 by a shaft 33, and the first link 28 connects the lever 29 to the rocking plate 2.
7, the second link 30 connects the lever 29 to the arm 17
And a connecting member for connecting the cam follower 26 and the backrest 16 with these members 28 to 30. The backrest tilting mechanism 24 operates in conjunction with the rotation of the seat frame 3 to tilt the backrest 16 from the normal position to the retreat position at the beginning of the rotation of the seat frame 3, and at the end of the rotation of the seat frame 3. The backrest 16 is returned from the retracted position to the normal position.

As shown in FIGS. 4 and 5, the back tilting mechanism 24 further includes a gas cylinder 3 as a first urging member.
5, and a coil spring 36 as a second urging member
The two members 35 and 36 are interposed between the seat frame 3 and the lower ends of the two inner arms 17, respectively. And
The gas cylinder 35 feeds out the rod 35b with the pressure of the gas sealed in the cylinder tube 35a and constantly urges the backrest 16 toward the retreat position. On the other hand, the coil spring 36 extends when the backrest 16 is in the retracted position, and urges the backrest 16 toward the normal position with a weaker tension than the gas cylinder 35. The rear end of the coil spring 36 is hooked on the arm 17 via the rotating piece 37,
When 6 is near the normal position, the coil spring 36 does not generate tension.

Next, the operation of the direction-variable seat 1 of the present embodiment configured as described above will be described. When the seating direction is changed by an automatic operation, the motor 4 is started, and the lock lever 9 is rotated via the wire 11 by the initial rotation of the motor 4.
Is rotated inward, and the lock of the seat frame 3 is released. Further, with the rotation of the lock lever 9, the slide pin 21 is immersed in the support 14 by the wire 22, and
6 is also released. In this state, the seat frame 3 starts rotating by the rotational force of the motor 4 and the urging force of the gas cylinder 35, and the back tilting mechanism 24 is operated in conjunction with the rotation.

At the initial stage of rotation of the seat frame 3, as shown in FIG. 2, the cam follower 26 is moved down along the cam 25 in the back tilting mechanism 24, and the swinging plate 27 is swung downward, so that the first Link 28, lever 29, and second link 30
The backrest 16 is tilted from the normal position to the retracted position via the. During rotation of the seat frame 3, as shown in FIG. 5, the backrest 16 is held at the standby position by its own weight and the force of the difference between the gas cylinder 35 and the coil spring 36. In the standby position, the gas cylinder 35 extends to the stroke end to prevent the backrest 16 from tilting forward from the standby position. Then, at the end of the rotation of the seat frame 3, as shown in FIG. 1, the cam follower 26 is raised along the cam 25, and the backrest 16 is returned from the retracted position to the normal position.

When the seating direction is manually changed, the lock lever 9 is rotated by the foot pedal 10 to release the lock of the seat frame 3 and the backrest 16, and then the backrest 16 is manually operated. Rotate with. Then, the backrest tilting mechanism 24 operates in the same manner as at the time of automatic rotation to tilt the backrest 16 to the retreat position at the beginning of rotation of the seat frame 3 and return the backrest 16 to the normal position at the end of rotation. At this time, since the gas cylinder 35 and the coil spring 36 reduce the tilting power of the backrest 16, the user can easily change the seating direction with a small force.

As described above, according to the variable direction seat 1 of the present embodiment, the backrest 16 is moved by the backrest tilting mechanism 24 while the seat frame 3 is rotating.
As a result, the rear end of the backrest 16 has a smaller turning radius because it is located at the retracted position ahead of the normal position, and the pitch between the front and rear seats can be reduced accordingly, and a large number of railcars can be located in a limited space. A variable direction seat 1 can be installed. Moreover, since the backrest tilting mechanism 24 is configured separately from the reclining mechanism, the present invention can be applied even if the seat 1 does not (or does) include the reclining mechanism as in the present embodiment.

Further, since the gas cylinder 35 urges the backrest 16 toward the retracted position, the rotation of the seat frame 3 at the beginning of rotation is
With the help of the urging force, the backrest 16 is smoothly tilted to the standby position. On the other hand, the coil spring 36
Is biased toward the normal position with a weaker force than the gas cylinder 35, and at the end of rotation of the seat frame 3, the backrest 16 smoothly returns to the normal position with the help of the biasing force of the coil spring 36. Is done. Therefore, the tilting power of the backrest 16 borne by the motor 4 can be reduced, and the seat frame 3 can be rotated by the relatively small motor 4 and the backrest 16 can be reliably tilted.

The present invention is not limited to the above embodiment, but may be embodied by changing the shape and configuration of each part as exemplified below. (1) In the backrest tilting mechanism, the number of links and levers between the backrest 16 and the cam follower 26 is appropriately increased or decreased,
Changing the connecting member. (2) One or both of the first urging member and the second urging member are constituted by coil springs. (3) One or both of the first urging member and the second urging member are constituted by gas cylinders. (4) Applicable to single-seat or two-seat variable seats. (5) Application to variable seats for other vehicles such as buses and passenger ships.

[0022]

As described above in detail, according to the vehicle type variable seat according to the first or second aspect of the present invention, whether the seat is provided with the reclining mechanism or not, the separate reclining mechanism is provided. The tilting mechanism of the backrest makes it possible to reduce the turning radius of the upper end of the backrest during the rotation of the seats, thereby minimizing the pitch between the front and rear seats, and enabling a large number of seats to be installed in a limited space. . In addition, the seat frame
In the initial rotation of the backrest, the backrest is assisted by the urging force of the first urging member.
Is tilted to the standby position, so that it is tilted smoothly.

Further, according to the vehicle variable seat according to the third aspect of the present invention , the second urging member is attached at the end of rotation of the seat frame.
The backrest returns to its normal position with the help of the forces,
Returned to mood.

[Brief description of the drawings]

FIG. 1 is a side view of an internal structure of a directional variable seat for a railway vehicle according to an embodiment of the present invention.

FIG. 2 is a side view of the internal structure of the seat when the backrest is at a retracted position.

FIG. 3 is a front view of the internal structure of the seat.

FIG. 4 is a sectional view taken along line AA of FIG. 3 when the backrest is in a normal position.

FIG. 5 is a sectional view taken along line AA of FIG. 3 when the backrest is at a retracted position.

[Explanation of symbols]

1 direction variable seat 2 base 3 seat frame 4 motor 16 backrest 24 backrest tilting mechanism 25 cam 26 cam follower 27 rocking plate 28 first link 29 lever 30 second link 35 gas cylinder 36 coil spring

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B60N 2/14 A47C 3/18 B61D 33/00

Claims (3)

(57) [Claims] 1. A base fixed to a floor of a vehicle, a seat frame rotatably provided on the base, a motor for driving and rotating the seat frame, and a normal position inclined rearward on the seat frame. And the backrest tiltably supported between the retracted position ahead of it and the backrest, from the normal position to the retracted position at the beginning of rotation of the seat frame, and from the retracted position to the normal position at the end of rotation of the seat frame. A backrest tilting mechanism for returning the backrest tilting mechanism, a cam provided on a base, a cam follower supported on a seat frame so as to engage with the cam, and a connecting member for connecting the cam follower and the backrest. And a first urging unit for urging the backrest toward the retracted position
The first biasing member is attached at the beginning of rotation of the seat frame.
The backrest is tilted to the standby position with the help of the forces
A variable direction seat for vehicles. 2. A base fixed to a floor of a vehicle, and on the base
And a seat frame rotatably provided on the seat, and driving and rotating the seat frame
Normal position of the motor and seat frame rearwardly inclined and before
Backrest that is tiltably supported between the two
From the normal position to the retracted position at the beginning of rotation of the seat frame
Return to the normal position from the retracted position at the end of rotation of the seat frame
A back-tilting mechanism for causing the
A cam with a gentle slope on the side of the table,
Supported on the side of the seat frame as it descends and rises along the slope
Connected cam follower and cam follower and backrest
First urging for urging the connecting member and the backrest toward the retracted position
And the first urging member at the beginning of rotation of the seat frame.
The backrest is tilted to the standby position with the help of the bias
A variable direction seat for vehicles , characterized in that: 3. The backrest tilting mechanism includes a backrest at a retracted position.
Energizes toward the normal position with a weaker force than the first urging member
3. The method according to claim 1, further comprising a second urging member.
Onboard variable direction seat for vehicles.