JP2003146125A - Storable seat for railroad vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a storable seat for a railroad vehicle supporting a seating surface frame swingably between a seating position and a storing position around a horizontal rotating axis along a back rail frame capable of preventing damage to components by releasing lock (allowing pulling out) when force pulling out the seating surface frame in the storing position acts. SOLUTION: This seat is provided with a driving arm provided on a hinge bracket coaxial and as one body with the seating surface frame, an actuator connected to the driving arm of the hinge bracket and making force pulling up the seating surface frame from the seating position to the storing position act on the seating surface frame to lock pull-down of the same from the storing position to the seating position when a lock signal is given, and unlocking the seating surface frame when an unlock signal is given, and a release means releasing lock of the actuator when the seating surface frame in the storing lock position is forcedly pulled out toward the seating position under a condition that the unlock signal is not given to the actuator.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a retractable seat for a railway vehicle.

[0002]

2. Description of the Related Art In a railway vehicle, a retractable seat provided for the purpose of increasing a passenger rate in a rush hour has a seat frame in which a seat surface frame rotatably supported about an axis is projected to the inside of the vehicle. It has a basic structure that is movably supported between a position and a storage position along the backrest frame. Locking and unlocking of the seat frame is centrally controlled in the driver's cab (conductor room) .In the locked state, the drawer of the seat frame in the storage position is locked, and in the unlocked state, the seat frame can be pulled out to sit down. it can. However, passengers sometimes try to forcefully pull out the seat frame in the locked state from the storage position, and various measures have been taken.

However, the conventional measures for preventing the pull-out are to prevent the seat frame from being pulled out unreasonably at the storage position, and the strength of each member must be increased. However, there is a limit to the increase in strength due to the limitation on the size of weight, and it is not possible to completely prevent unreasonable withdrawal. If it is forcibly pulled out, the component members are naturally damaged.

[0004]

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a retractable seat for a railway vehicle in which the constituent members are not damaged even if the seat frame in the retracted position is forcibly pulled out.

[0005]

SUMMARY OF THE INVENTION The present invention departs from the idea of preventing the seat frame in the storage lock position from being pulled out forcibly, and unlocks the lock when force is applied to pull it out (allows pulling out). ) It was made based on the idea of reversal to prevent damage to the components.

A retractable seat for a railway vehicle according to the present invention is
A seat frame vertically fixed in a rail vehicle; a horizontal rotation center axis along the back frame; a seating position protruding inward from the rotation center axis and a storage position along the back frame. A seat frame rotatably supported between the seat frame and a hinge bracket having a drive arm that is coaxial with the seat frame and extends on the opposite side of the seat frame with respect to the central axis of rotation; When a lock signal is given, a pulling force from the seat position to the storage position is applied to the seat surface frame to lock the pulling down from the storage position to the seat position, and when a lock release signal is given, Actuator that unlocks the seat frame lock;
And unlocking means for unlocking the actuator when the seat frame in the storage position is forcibly pulled out in the seat position direction in the state where the unlock signal for the actuator is not given. It has a feature.

Specifically, the actuator can be composed of a gas spring having one end connected to the drive arm of the hinge bracket and the other end connected to the backrest frame. This gas spring raises the seat frame to the stowed position by a lock signal and becomes free by an unlock signal. The gas spring generally comprises a push rod which, when pressed, frees the spring.

This push rod can be pressure-displacement-controlled through an operation lever which is controlled to move forward and backward by a control actuator other than the actuator. Further, when the seat surface frame in the storage lock position is forcibly pulled out, the push rod can be pulled out by pressing it through the pressing cam surface provided on the drive arm of the hinge bracket, for example.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION A retractable seat for a railway vehicle according to the present embodiment, as shown in the example of the installation mode of FIG. 1, is a backrest frame 10 fixed in a vertical position in a railway vehicle, and this backrest frame 10. And a seat surface frame 12 pivotally attached to a rotation center shaft 11 in the horizontal direction. Seat frame 12
Can be rotated about the rotation center shaft 11 between a seat position (projection position) indicated by a chain line and protruding toward the inside of the vehicle, and a storage position along a backrest frame 10 indicated by a solid line. The seat back frame 10 and the seat frame 12 are concepts including a cushion material. Although the example of FIG. 1 is an example in which the backrest frame 10 is oriented in the width direction of the vehicle, it is of course possible to adopt a mode in which it is oriented along the side plate.

In detail, as shown in FIGS. 2 to 4,
The seat back frame 10 has inner frames 10X on the left and right, and hinge brackets 14 that are rotatable around a rotation center shaft 11 are pivotally mounted on the left and right inner frames 10X, respectively. Each of the left and right hinge brackets 14 has a seat surface fixing arm 14X for fixing the seat surface frame 12, and one hinge bracket 14 has the seat surface fixing arm 14X (the seat surface frame 12) with respect to the rotation center axis 11. ) And a drive arm 14Y extending to the opposite side.

The drive arm 14Y of this hinge bracket 14
And the upper portion of the backrest frame 10, both ends of a gas spring 15 with a lock mechanism serving as an actuator for moving the seat surface frame 12 between a seat position and a storage position are connected. That is, the gas spring with lock mechanism (hereinafter simply referred to as gas spring) 15 includes a cylinder body 15X, a piston slidably fitted in the cylinder body 15X, and a piston rod 15 fixed to the piston.
And an upper end of a cylinder body 15X is pivotally attached to the inner frame 10X by a shaft 16, and an end bracket 17 fixed to a lower end of a piston rod 15Y is pivotally attached to a drive arm 14Y by a shaft 18.

The gas spring 15 is a well-known actuator in which compressed gas and oil are enclosed, and is a push rod 15Z protruding from the lower end of the piston rod 15Y.
When is pressed and displaced, the valve provided in the piston portion operates and the piston rod 15Y extends with respect to the cylinder body 15X by the action of the enclosed compressed gas. On the other hand, when the pressing force on the push rod 15Z is released, it has a function of locking the piston rod 15Y with respect to the cylinder body 15X at the time of the release. Therefore, the push rod 15Z
In the state where the gas spring 15 is continuously pressed and displaced, the entire length of the gas spring 15 is maximized, and as a result, the seat surface frame 12 moves to the storage position. Further, with the push rod 15Z pressed, the gas spring 1 is attached to the seat surface frame 12.
When a pulling force larger than the extension force of 5 is applied (the passenger pulls out the seat frame 12), the gas spring 15 contracts (the piston rod 15Y enters the cylinder body 15X). That is, when the push rod 15Z is pressed and displaced, the gas spring 15 becomes free in the shortening direction. A rotation end (seat position) of the seat frame 12 in the protruding direction is restricted by a stopper (not shown) provided on the backrest frame 10.

Push rod 15 of gas spring 15
Z is pressure-controlled by the two-system pressure control system. The first pressing control system is a control system by the control actuator 20 (FIG. 3) that normally moves the seat frame 12 in and out. The control actuator 20 pulls up the rod 21 when energized. The rod 21 is coupled to a cable coupling body 23 which is biased downward in the drawing by a tension spring 22, and one end portion of an inner cable 24X of a cable assembly 24 is connected to the cable coupling body 23. , The inner cable 24X moves in the same direction as the rod 21. Both ends of the outer cable 24Y of the cable assembly 24 are attached to the end bracket 1
It is fixed between a part of 7 and a part of the backrest frame 10.

On the other hand, the end bracket 17 fixed to the piston rod 15Y of the gas spring 15 has a bifurcated cross section with the push rod 15Z sandwiched therein, and an operating lever 26 is pivotally mounted therein by a shaft 25, The other end of the inner cable 24X is coupled to the free end of the operating lever 26. The operating lever 26 is opposed to the push rod 15Z of the gas spring 15, and the control actuator 20 is energized to pull up the cable coupling body 23. As a result, when the inner cable 24X descends on the end bracket 17 side, the push rod 15 is pushed.
Separate from Z.

When the power supply to the control actuator 20 is cut off, the rod 21 is lowered by the force of the tension spring 22,
The inner cable 24X is pulled in the same direction. Then, on the end bracket 17 side, the inner cable 24X is pulled up, and the operation lever 26 rotates upward about the shaft 25 to press and displace the push rod 15Z. Therefore, the piston rod 15Y extends with respect to the cylinder body 15X or becomes free in the shortening direction as described above. That is, when the piston rod 15Y is in the maximum expanded state, it can be contracted by applying a force.

This first pressure control system (normal use condition)
Then, the lock signal is given (energized) to the control actuator 20 in the state where the gas spring 15 is maximally expanded. Then, the cable coupling body 23 is pulled up, the inner cable 24X is lowered on the end bracket 17 side, and the operation lever 26 is separated from the push rod 15Z (FIG. 5 (A)). In the locked state of the gas spring, the seat frame 12 is locked in the storage position.

On the other hand, when a lock release signal is given to the control actuator 20 (energization is cut off), the inner cable 24X is pulled up on the end bracket 17 side, and the operation lever 26 is rotated upward about the shaft 25. Then, the push rod 15Z is pressed and displaced. Therefore, the lock is released, and the piston rod 15Y is moved to the cylinder body 15
It becomes possible to push it into X. In this state, the passenger can pull out the seat surface frame 12 while contracting the gas spring 15 by giving a pulling force to the seat surface frame 12 (FIG. 5C). Then, when the pulling force to the seat surface frame 12 is released (when the passenger stands up), the seat surface frame 12 is returned to the storage position by the extension force of the gas spring 15.

Push rod 15 of gas spring 15
The second pressing control system for pressing and controlling Z is a control system when the seat frame 12 at the storage lock position is forcibly pulled out. Drive arm 14Y of the hinge bracket 14
The leading end portion of is located between the bifurcated portions of the end bracket 17 and enters the lower surface of the operation lever 26. And
The surface facing the operation lever 26 is the pressing cam surface 14Z. The pressing cam surface 14Z has no influence on the movement of the operation lever 26 by the control actuator 20. When the pressing cam surface 14Z attempts to forcibly pull out the seat surface frame 12 in the storage lock position, the operation lever 26 is pushed to push and displace the push rod 15Z in the initial stage of the rotating operation (FIG. 5).
(B)). Therefore, the operation lever 26 is in the same state as when it is pulled up via the control actuator 20,
The lock is released. That is, the piston rod 15Y
Is free in the direction of shortening with respect to the cylinder body 15X, the seat frame 12 can be projected to the seat position (FIG. 5 (C)). Therefore, even if the seat frame 12 at the storage lock position is forcibly pulled out, the constituent members are not damaged.

In the above embodiment, the hinge bracket 1
The pressing cam surface 14Z of No. 4 unlocks the gas spring 15 when the seat surface frame 12 in the storage lock position is pulled out in the seat position direction in the state where the unlocking signal for the gas spring (actuator) 15 is not given. It constitutes a canceling means.

The gas spring 1 shown in the above embodiment
5 itself is well known, and the present invention does not care about its specific structure. In addition, an actuator other than the gas spring may be used as long as it has the same function.

[0021]

According to the present invention, it is possible to obtain a retractable seat for a railway vehicle in which the constituent members are not damaged when the seat frame at the retracted position is forcibly pulled out.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of an installation mode of a retractable seat of a railway vehicle according to the present invention.

FIG. 2 is an exploded perspective view of a main part of the retractable seat.

FIG. 3 is a front view of the same.

FIG. 4 is a side view of the same.

5 (A), (B) and (C) are side views of essential parts showing different operating states of the retractable seat.

[Explanation of symbols]

10 backsliding frame 11 Rotation center axis 12 seat frame 14 Hinge bracket 14X fixed seat arm 14Y drive arm 14Z pressure cam surface 15 Gas spring with lock mechanism (actuator) 15X cylinder body 15Y piston rod 15Z push rod 16 18 25 axes 17 End bracket 20 Control actuator 21 rod 22 Tension spring 23 Cable combination 24 cable assembly 24X inner cable 24Y outer cable 26 Operation lever

Claims (5)

[Claims] 1. A backsledding frame vertically fixed in a railway vehicle; a horizontal center axis of rotation along the backing frame; a seating position projecting inwardly of the vehicle and a backseat along the center of rotation. A seat frame rotatably supported between a storage position along the frame; a hinge bracket having a drive arm that is coaxial with the seat frame and extends on the opposite side of the seat frame with respect to the center axis of rotation; When the lock signal is applied to the drive arm of the bracket, a pulling force from the seat position to the storage position is applied to the seat surface frame to lock the pulling from the storage position to the seat position, and the lock release signal is applied. An actuator that releases the lock of the seat frame when a lock is applied; and the storage lock position when the lock release signal for the actuator is not applied. A retractable seat for a railway vehicle, comprising: a releasing means for releasing the lock of the actuator when the seat frame is forcibly pulled out in the seat position direction. 2. The retractable seat for a railway vehicle according to claim 1, wherein the actuator comprises a gas spring having one end connected to a drive arm of the hinge bracket and the other end connected to a backrest frame. The gas spring is a retractable seat for railway vehicles that becomes free by the above unlock signal. 3. The retractable seat for a railway vehicle according to claim 2, wherein the gas spring includes a push rod, and the push rod is free when the push rod is displaced. 4. The retractable seat for a railway vehicle according to claim 3, wherein the push rod is pressed via an operation lever which is controlled to move forward and backward by a control actuator different from the actuator. . 5. The retractable seat for a railway vehicle according to claim 2 or 3, wherein the push rod has a pressing cam provided on a drive arm of the hinge bracket when the seat frame at the storage lock position is forcibly pulled out. A retractable seat for railway vehicles that is pressed through the surface.