JP6085509B2 - Railroad swivel seat - Google Patents

Description

The present invention relates to a railroad rotating seat provided with a shock absorbing member so that the seat is not destroyed when a shock is received from the back.

Railway vehicles in recent years have been reduced in weight in response to requests for energy saving. Aluminum has come to be used instead of conventional iron to reduce the weight of the body that makes up the vehicle. In addition, with regard to in-vehicle wiring, the amount of electric wires required for wiring has been significantly reduced by adopting TIMS (Train Information Management System).

There is also a request for this weight reduction in railway seats, and materials and structures are being reviewed to reduce the weight of the seats. By using aluminum members for the seats, the weight of seats per person on the Shinkansen has been reduced from 28 kg for 100 series vehicles to 13 kg for 300 series. In order to reduce the weight of seats, it is necessary to review the materials used for seats and the seat structure.

While reviewing the seat structure, it is necessary to reduce the thickness of the material used for weight reduction while ensuring the strength required for the seat. The required strength is a strength that does not interfere with normal use and a strength that is not destroyed when subjected to an impact. The normal strength is for supporting the human body from below, and the strength when receiving an impact is such that it can withstand the impact load of the human body from behind during sudden deceleration.

The largest load capacity required for railway seats is the impact load from behind during sudden deceleration. At the time of sudden deceleration, the human body collides with the back of the seat from behind the seat and an impact load is applied to the seat, but there is a problem that the impact resistance decreases if the thickness of the member used for weight reduction is reduced. It is necessary to devise a way to prevent the seat from being destroyed.

As a prior art, an example in which a frame (frame) that supports a seat or a back of a seat is devised in order to increase the impact resistance of the seat is disclosed (see Published Patent Document 1). This absorbs an impact by changing the shape of a member constituting a frame that supports the seat or back of the seat when an impact is received.

Further, an example is disclosed in which a bellows-shaped member is provided on a seat cushion frame of an automobile, and when an impact is received from the rear, the bellows-shaped member is plastically deformed to absorb the impact (see Published Patent Document 2).

In the above shock absorbing method, the seat and the seat cushion itself are deformed to absorb the shock, so that the seat needs to be replaced and repaired after receiving the shock. Therefore, an example in which a shock absorbing member is provided separately from the seat structure to absorb the shock is disclosed (see Published Patent Document 3). In this example, the piston moves in the cylinder whose inner diameter is gradually narrowed to generate a resistance force against the impact force and absorb the impact.

By the way, in railway rotary seats, as described above, it is required to reduce the thickness of the members used for the seats due to the demand for weight reduction of the vehicle, but if the thickness of the members is reduced, the impact resistance of the seats is lowered. There is a problem of doing. In particular, in a rotary seat, a connection portion that rotatably connects a pedestal on which a seat portion on which a person rests is attached to a pedestal fixed to a vehicle is often destroyed by an impact load from behind.

Japanese Unexamined Patent Publication No. 2003-182427 JP-A-2002-12072 Japanese Unexamined Patent Publication No. 2007-161049

As described above, it is necessary to take measures to increase the impact resistance of the rotating seat while responding to the demand for weight reduction of railway vehicles.

Therefore, the inventors have conducted research and development on a configuration for improving impact resistance while maintaining the rotational function of the pedestal of the rotating seat on which the seat and the back are placed. As a result, we have developed a railway rotating seat that can reduce the weight of the seat and protect the rotating connection, which is a weak point of the rotating seat.

An object of the present invention is to provide a railway rotating seat capable of protecting a rotating connection portion, which is a weak point of the rotating seat in order to reduce the weight of the seat.

The invention according to claim 1 comprises a pedestal to be attached to a vehicle, a pedestal to which a seat and a back for supporting a human body are attached, a connecting portion for rotatably connecting the pedestal and the pedestal, and the above. It is directly or indirectly connected to either the pedestal or the pedestal, and when the pedestal receives a load from the rear on the back and rotates forward around the connecting portion, it is directly or indirectly connected to the other. It is a railway rotary seat characterized by comprising a shock absorbing member that is indirectly loaded and plastically deformed with respect to a force in the compression direction.

In the present invention, when the gantry receives a load on the back portion from the rear and rotates forward around the connection portion, the pedestal receives a load directly or indirectly from the other and is plastic to a force in the compression direction. By deforming, it prevents the pedestal having a predetermined size or more from rotating and prevents the connection portion from being destroyed.

According to the second aspect of the present invention, in the railway rotating seat according to the first aspect, the shock absorbing member is directly or indirectly connected to the front portion of either the pedestal or the pedestal. When the gantry receives a load from the rear on the back and rotates forward around the connection, the gantry is placed at a position where the distance from the other front portion decreases and receives the load directly or indirectly. It is characterized by.

When the gantry rotates around the connection, the distance between the gantry and the pedestal decreases in the front part of the seat, which is located opposite to the back. As this distance decreases, the gantry shifts downward at the front of the seat. At that time, the shock absorbing member and the front portion of any one of the pedestal and the pedestal are directly or indirectly subjected to a load to receive a force in the compression direction. This force causes the shock absorbing member to undergo plastic deformation and generate a resistance force, which hinders rotation.

According to a third aspect of the present invention, in the railway rotating seat according to the first aspect, the shock absorbing member is directly or indirectly connected to the rear portion of either the pedestal or the pedestal. When the gantry receives a load from the rear on the back and rotates forward around the connection, the gantry is placed at a position where the distance from the other rear portion decreases and receives the load directly or indirectly. It is characterized by.

The shock absorbing member is configured to undergo plastic deformation with respect to a force in the compression direction. When the gantry receives a load from the rear on the back and rotates forward around the connection part, it is placed at a position where the distance from the other rear part decreases and a force in the compression direction is applied to the shock absorbing member. Has been done. Therefore, the shock absorbing member undergoes plastic deformation due to the force due to the load from behind, which causes a resistance force that hinders the rotation. Since this shock absorbing member generates a resistance force in the compression direction, it is called a compression type shock absorbing member.

Here, even in the rear portion of the seat, when the pedestal is viewed from a member fixed to the pedestal and located above the pedestal, the distance decreases as the pedestal rotates. Further, when the pedestal is viewed from a member fixed to the pedestal and located below the pedestal, the distance decreases as the pedestal rotates. Therefore, it can be seen that the compression type absorbent member can be used even in the rear part of the seat.

According to the first aspect of the present invention, when the gantry rotates due to an impact, the shock absorbing member receives a load directly or indirectly from the gantry or the pedestal and plastically deforms to hinder the rotation. It is possible to prevent the portion from being destroyed.

According to the second aspect of the present invention, since the vertical portion of the shock absorbing member is connected to the front portion of either the pedestal or the pedestal, the distance between the pedestal and the pedestal due to rotation. Can be effectively captured. When the gantry rotates in response to an impact, the shock absorbing member receives a load directly or indirectly from the gantry or the pedestal, and the shock absorbing member plastically deforms with the rotation to prevent the rotation. Can be prevented from being destroyed.

According to the third aspect of the present invention, when the gantry rotates due to an impact, the shock absorbing member receives a load directly or indirectly from the gantry or the pedestal, and the rear portion of the gantry accompanying the rotation of the gantry. Since the shock absorbing member is plastically deformed due to the change in the distance between the foot and the rear portion of the pedestal to prevent rotation, it is possible to prevent the connecting portion from being broken.

It is a front view of the railroad rotary seat to which the shock absorbing member 15 is attached. It is a figure which shows the mode that the gantry rotates forward by the load from the rear part of the back part. It is explanatory drawing which attached the shock absorbing member to the front part of the seat (A) and (B), and is the explanatory drawing which attached the shock absorbing member to the rear part of (C) and (D) a seat. It is explanatory drawing of (A) the cylindrical compression type shock absorbing member, and (B) is the explanatory view of the bellows type compression type shock absorbing member. It is a figure explaining the state of rotation of a shock absorbing member and a gantry.

FIG. 1 is a front view of a railway rotating seat in which the shock absorbing member 15 used in the present invention is arranged between a pedestal and a pedestal on which a seat and a back are placed. The figure shows a state in which the gantry can rotate, and since the shock absorbing member 15 is in a non-contact state with a distance from the member 14 that is in contact with the shock absorbing member and applies a load, the gantry is attached to the legs. On the other hand, it can rotate freely. As shown in FIG. 5, the shock absorbing member is placed in a place where the gantry does not directly or indirectly collide with the other pedestal when the gantry rotates so as not to hinder the rotation of the gantry in a rotatable state. Can be attached.

FIG. 2 shows a normal state (solid line) and a state in which the gantry rotates forward around the connection portion 4 by receiving a load from the rear on the back of the seat (dotted line). When the vehicle rapidly decelerates due to a collision or a sudden stop, a person sitting at the rear of the seat collides with the back 6 of the front seat from the rear. Then, as shown by the dotted line in FIG. 2, the seat receives a large impact force from the rear and rotates around the connecting portion 4 that supports the rotation of the gantry. If the actual connection has a structure in which ball bearings are arranged on a predetermined circumference around the central axis, it will rotate around the front edge of the connection when it receives an impact from behind. ..

At this time, as shown by the dotted line in FIG. 2, the front edge of the connecting portion 4 receives compressive stress, and the central axis and the trailing edge receive tensile stress, so that the weak portion is destroyed. Since the connecting portion is structurally more complicated than the gantry and the pedestal, it is difficult to configure the connecting portion so that it is not destroyed by rotation while maintaining the rotation function. In addition, there is a problem that the repair cost increases when the product is destroyed.

Therefore, a shock absorbing member is provided as shown in FIG. 3 so that the connecting portion is not destroyed by the assumed impact load from the back surface. The shock absorbing member is attached directly to either the pedestal or the pedestal or indirectly via the member. The shock absorbing member was kept in non-contact until the pedestal was rotated beyond a predetermined range by receiving an impact force from behind and was in direct or indirect contact with either the pedestal or the pedestal. Is done.

Although FIG. 3 shows a contact member 14 that applies a load to the shock absorbing member 15, the shock absorbing member 15 may receive the load directly from the pedestal or the pedestal. When the gantry is lifted to be rotatable, there is a gap between the shock absorbing member 15 and the contact member 14 to which the load is applied, but usually the gantry may be in contact with the gantry. In FIG. 3, a gap is provided between the shock absorbing member 15 and the contact member 14 to which the load is applied so that it can be easily understood.

FIG. 3A shows a state in which the shock absorbing member 15 is connected to the front portion of the gantry. In the rotatable state, the contact member 14 extending downward has a distance from the shock absorbing member 15 fixed to the pedestal and does not come into contact with each other. In this state, the gantry can rotate freely with respect to the pedestal.

FIG. 3B shows a state in which the shock absorbing member 15 is connected to the lower side of the front portion of the pedestal. In this figure, the contact member 14 fixed to the gantry and extending downward from the pedestal has a distance from the shock absorbing member 15 supported by the holding member 16, and the gantry is rotatable. Do not touch each other. In this state, the gantry can rotate freely with respect to the pedestal as shown in FIG.

When the gantry receives a load from the rear on the back and tries to rotate forward around the connection, the distance between the front part of the gantry and the front part of the pedestal decreases. Then, the shock absorbing member 15 and the contact member 14 come into contact with each other, and a force in the compression direction is applied to the shock absorbing member 15. When a certain force or more is applied, the shock absorbing member 15 exceeds the elastic limit and undergoes plastic deformation, so that a resistance force is generated against the rotation of the gantry. By determining the load capacity of the shock absorbing member 15 according to the assumed magnitude of the impact force, the range of rotation can be suppressed to a certain range. It is prevented that 4 is deformed and destroyed.

FIG. 3C shows a state in which the shock absorbing member 15 is indirectly connected to the rear portion of the gantry via the holding member 16. A shock absorbing member is connected to the horizontal portion at the tip of the holding member 16 extending downward to have a distance from the lower surface of the pedestal, and the pedestals do not come into contact with each other in a rotatable state. In this state, the gantry can rotate freely with respect to the pedestal.

FIG. 3D also shows a state in which the shock absorbing member 15 is connected to the rear portion of the gantry. The shock absorbing member 15 has a distance from the horizontal portion at the tip of the contact member 14 extending upward of the pedestal, and does not come into contact with each other when the gantry is rotatable. In this state, the gantry can rotate freely with respect to the pedestal.

When the gantry receives a load from the rear on the back and tries to rotate forward around the connection portion, the distance between the rear portion of the gantry and the rear portion of the pedestal increases. In order to regard this change in distance as a decrease in distance, the upper surface of the object fixed to the gantry and the lower surface of the object fixed to the pedestal may be brought into contact with each other. Along with the rotation, the shock absorbing member 15 comes into contact with the contact member 14 and a force in the compression direction is applied. When a force exceeding a certain level is applied, the shock absorbing member 15 exceeds the elastic limit and undergoes plastic deformation, so that a large resistance force is generated against the rotation of the gantry. By determining the load capacity of the shock absorbing member 15 according to the assumed magnitude of the impact force, the range of rotation can be suppressed to a certain range. It is prevented that 4 is deformed and destroyed.

A method of attaching the shock absorbing member can be considered in addition to the above. The shock absorbing member is attached at a position that hinders the change in the distance between the pedestal and the pedestal due to rotation so that the shock absorbing member does not hinder the rotation of the pedestal when the pedestal is rotatable. Further, it is effective to connect the shock absorbing member to the place where the distance from the pedestal changes most when the pedestal rotates.

FIG. 4 shows an example of a specific shape of the shock absorbing member. FIG. 4A is a metal cylindrical shock absorbing member, and FIG. 4B is a metal bellows type shock absorbing member. The shape and material of the shock absorbing member can be selected according to the resistance force that hinders the rotation.

Of course, the shape and material of the shock absorbing member are not limited to the above examples because various shapes can be considered under the condition that the shock absorbing member is configured to undergo plastic deformation with the rotation of the gantry.

2 Leg stand 3 Stand 4 Connection part 5 Seat part 6 Back part 6'Back part in a rotated state 14 Contact member 15 Shock absorbing member 16 Holding member

Claims (3)

The pedestal that can be attached to the vehicle and
A pedestal to which the seat and back that support the human body are attached,
A connection portion that rotatably connects between the pedestal and the gantry,
It is directly or indirectly connected to either the gantry or the pedestal, and when the gantry receives a load from the rear on the back and rotates forward around the connection, the pedestal is directly or indirectly connected to the other. A railway rotary seat characterized by comprising a shock absorbing member that is indirectly loaded and plastically deformed with respect to a force in the compression direction. The shock absorbing member is directly or indirectly connected to the front portion of either the pedestal or the pedestal, and the pedestal receives a load from the rear on the back portion and rotates forward around the connecting portion. The railway rotating seat according to claim 1, wherein the railway rotating seat is placed at a position where the distance from the other front portion is reduced when moving and is directly or indirectly subjected to a load. The shock absorbing member is directly or indirectly connected to the rear portion of either the pedestal or the pedestal, and the pedestal receives a load from the rear on the back and rotates forward around the connecting portion. The railway swivel seat according to claim 1, wherein when it is moved, it is placed at a position where the distance from the other rear portion is reduced and is directly or indirectly subjected to a load.

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