JP7383541B2 - Holding down device and railway vehicle - Google Patents

Description

TECHNICAL FIELD The present invention relates to a holding device and a railway vehicle, and particularly to a holding device and a railway vehicle that can detect holding and loosening with one sensor.

Railway vehicles, especially high-speed vehicles, employ plug doors whose outer surfaces match the outer surface of the vehicle body when the entrance is closed, in order to reduce noise such as wind noise and air resistance.

Patent Documents 1 and 2 disclose a holding device that rotates a link member between a holding position and a slack position by extending a piston rod of a cylinder device, and presses (or releases) a plug door from a closed position to an airtight position. will be disclosed. The holding device of Patent Document 1 includes a limit switch that detects that the link member is rotated to the holding position (pressing detection), and the holding device of Patent Document 2 detects that the link member is rotated to the slack position. Equipped with a limit switch (to detect looseness).

Patent Document 3 discloses a holding device that rotates a drive shaft of an actuator to rotate a link member between a holding position and a slack position, and presses a plug door to an airtight position (or releases it to a closed position). Ru. The holding device of Patent Document 3 includes two limit switches, and the first limit switch can detect pressing, and the second limit switch can detect slack.

WO2013/031553 (Paragraph 0065, Figure 6, etc.) JP 2008-174149 (Paragraph 0046, Figure 1, etc.) JP 2002-264805 (Paragraph 0034, Figure 4, etc.)

However, in the above-mentioned conventional technology, a plurality of sensors are required to detect pressing and loosening, resulting in an increase in cost.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a holding device and a railway vehicle that can detect holding and loosening with one sensor.

In order to achieve this object, the holding device of the present invention supports a door that opens and closes a doorway opened in a side wall of a vehicle body, and supports the door movably between a position where the doorway is opened and a position where the doorway is closed. A cylinder device that extends and contracts a rod, and a pressing member that is connected to the rod and presses the door toward the outside of the vehicle body as the rod expands. and a displacement member that is displaced between a first position and a second position by receiving an action from the rod, and a detection means for detecting whether the displacement member is in the first position, The member is disposed in a relaxed position when the rod is most retracted, and is disposed in a holding position that moves the door most toward the outside of the vehicle body when the rod is most extended; , an extension abutting part that comes into contact with one side of the displacement member when it is extended, and a contact part that is arranged at a predetermined distance from the extension abutment part, and a side that is opposite to the one side of the displacement member when it retracts. a retracted abutment portion that abuts on the other side, and when the rod is extended from the most retracted state, the first position or the The extension contact portion is brought into contact with one side of the displacement member disposed at one of the second positions, and the displacement member is displaced together with the rod being expanded, so that the rod is expanded to the maximum. When the displacement member is disposed at the other of the first position or the second position and the rod is retracted from the most extended state, the displacement member The retraction abutting portion is brought into contact with the other side of the displacement member disposed at the other of the first position or the second position, and the displacement member is displaced together with the rod being retracted, When the rod is most retracted, the displacement member is located at one of the first position and the second position.

According to the holding device according to claim 1, the pressing member is arranged at a slack position when the rod is most retracted, and is a holding member that moves the door most toward the outside of the vehicle body when the rod is most extended. position, and when the rod is extended from the most retracted state, the rod extends to one side of the displacement member located in either the first position or the second position immediately before the rod is most extended. When the abutting portion is brought into contact and the displacement member is displaced together with the rod being extended, the displacement member is placed in the other of the first position or the second position when the rod is in the most extended state, and the rod is When the rod is retracted from the most extended state, the retraction contact portion contacts the other side of the displacement member located at the other of the first position or the second position immediately before the rod is retracted the most. When the rod is retracted and the displacement member is displaced together with the rod, the displacement member is placed in either the first position or the second position when the rod is most retracted, so that the displacement member is in the first position. By detecting whether the pressure member is present using the detection means, it is possible to determine whether the pressing member is in the pressed position or in the relaxed position. That is, pressure detection and slack detection can be performed with one sensor.

According to the holding device according to claim 2, in addition to the effects achieved by the holding device according to claim 1, the holding device includes a first maintaining means for maintaining the displacement member disposed at the first position at the first position, and a first maintaining means for maintaining the displacement member disposed at the first position, and second maintaining means for maintaining the disposed displacement member in the second position, so that the displacement member in either the first position or the second position is moved to the first position or the second position due to a disturbance. Displacement to the other side can be suppressed. Therefore, pressing detection and loosening detection can be performed accurately.

Further, since the state in which the displacement member is maintained at the first position or the second position is released by the action of the rod on the displacement member, there is no need to separately provide a driving source for releasing the displacement member. Therefore, the structure can be simplified.

According to the holding device according to claim 3, in addition to the effects of the holding device according to claim 1 or 2, the displacement member moves between the first position and the second position along the direction parallel to the rod. Since the displacement member is slidably displaced, the space required to ensure the displacement of the displacement member can be reduced compared to, for example, a structure in which the displacement member is rotated around a predetermined rotation axis. That is, the space on the outer surface side of the tube of the cylinder device can be effectively utilized.

According to the presser device according to claim 4, in addition to the effects achieved by the presser device according to claim 3, the displacement member includes a slide body disposed outside the cylinder device and a portion protruding into the inside of the cylinder device. The abutting part during extension is arranged inside the cylinder device and comes into contact with the protruding part when the rod is extended, and the abutting part when retracting is arranged outside the cylinder device and contacts the protruding part when the rod is extended. Since it comes into contact with the slide body during retraction, the dead space inside the cylinder device can be effectively utilized. Therefore, for example, the holding device can be made more compact than in the case where both the extension contact portion and the retraction contact portion are arranged outside the cylinder device.

According to the presser device according to claim 5, in addition to the effects achieved by the presser device according to claim 4, the displacement member is formed so that the slide body and the protruding portion can be relatively displaced along the direction of expansion and contraction of the rod. , even if the protruding part is subjected to disturbance (for example, the protruding part is sucked into the space inside the cylinder with negative pressure, or the protruding part is viscously fixed to the abutting part during extension), the slide body will not return to its original position. It can be maintained in this position.

According to the railway vehicle according to claim 6, a door for opening and closing an entrance/exit opened in a side wall of the vehicle body;
Claims 1 to 5 include a support mechanism that movably supports the door between a position where the doorway is opened and a position where the door is closed, and a holding device according to any one of claims 1 to 5. The same effect as the pressing device described in any one of the above is achieved.

2 is a schematic diagram of a pressing device in an embodiment of the present invention, (a) is a schematic diagram of the pressing device in a state where the pressing member is placed in the slack position, and (b) is a schematic diagram of the pressing device in a state where the pressing member is in the pressing position. It is a schematic diagram of the holding device in the arranged state. (a) is a schematic partial cross-sectional view of the holding device in a state where the pressing member is placed in the slack position, and (b) is a schematic partial cross-sectional view of the holding device in a state where the pressing member is placed in the holding position. be. (a) is a partial cross-sectional schematic diagram of the holding device in a state where the piston rod is extended from the state shown in FIG. FIG. 6 is a schematic partial cross-sectional view of the holding device in a state where the piston rod is retracted from the state to the retracted contact position. (a) is a schematic diagram of the detection mechanism as viewed in the direction of arrow IVa in FIG. 2(a), and (b) is a schematic cross-sectional diagram of the detection mechanism taken along line IVb-IVb in FIG. c) is a schematic diagram of the detection mechanism as seen in the direction of arrow IVc in FIG. 2(b), and (d) is a schematic cross-sectional diagram of the detection mechanism taken along line IVd-IVd in FIG. 4(c). It is a schematic diagram of the holding device in the 1st modification, (a) shows the state where the pressing member is arranged at the slack position, and (b) shows the state where the pressing member is arranged at the pressing position.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a schematic diagram of a pressing device 200 according to an embodiment of the present invention, and FIG. (b) is a schematic diagram of the pressing device 200 in a state where the pressing member 217 is placed at the pressing position.

The railway vehicle includes a plug door 20 that opens and closes the entrance/exit 11 opened in the side structure 10, and a plug mechanism (not shown) that supports the plug door 20 movably in the section from the open position to the closed position to the airtight position. and a pressing device 200 that presses the plug door 20 toward the outside of the vehicle body.

An airtight packing 21 that is brought into close contact with the door frame of the side structure 10 is disposed on the peripheral edge of the outer surface (surface on the outside of the vehicle body) of the plug door 20 . Further, the holding device 200 is disposed facing the plug door 20 in such a manner that the direction of expansion and contraction of the piston rod 211 is in the vehicle width direction (left-right direction in FIGS. 1(a) and 1(b)).

As shown in FIG. 1, the holding device 200 includes a cylinder device 210 in which a piston rod 211 expands and contracts along the vehicle width direction (left and right directions in FIGS. 1(a) and 1(b)), and a tip end of the piston rod 211. and a pressing member 217 that presses the plug door 20 toward the outside of the vehicle body as the piston rod 211 expands. That is, the holding device 200 is configured as a direct-acting holding device.

In the holding device 200, when the piston rod 211 is most retracted, the pressing member 217 is arranged at the slack position, as shown in FIG. 1(a). When the piston rod 211 is extended from its most retracted state, the pressing member 217 comes into contact with the inner surface of the plug door 20 .

In the holding device 200, when the piston rod 211 is most extended, the pressing member 217 is placed in the holding position as shown in FIG. (the outer surface of the vehicle is matched to the outer surface of the vehicle body).

However, in a state where the pressing member 217 is placed in the holding position, the plug door 20 does not have to reach the outermost position of the vehicle body, and in this case, another holding device (not shown) may press the plug door 20. It may be configured to move the most toward the outside of the vehicle body. Note that another example of the holding device is a rotary holding device (one that presses the plug door 20 with a link member that rotates as the piston rod 211 expands and contracts).

As shown in FIG. 1(b), the pressing device 200 applies the driving force of the cylinder device 210 to the pressing member 217 in a state where the pressing member 217 is placed at the pressing position to generate force directed outward from the vehicle body. (A force that withstands the plug door 20 being pushed back from the airtight position due to the difference in air pressure inside and outside the vehicle body) can be applied to the plug door 20.

However, in a state where the pressing member 217 is placed in the pressing position, a configuration may be adopted in which no force is applied to the plug door 20 toward the outside of the vehicle body. In this case, the other pressing device described above may be The structure may be such that a force directed toward the plug door 20 is applied to the plug door 20.

Next, a detection mechanism for detecting loosening and pressing of the pressing device 200 will be described with reference to FIGS. 2 to 4.

FIG. 2(a) is a partial cross-sectional schematic diagram of the pressing device 200 in a state where the pressing member 217 is placed in the slack position, and FIG. FIG. 2 is a schematic partial cross-sectional view of the device 200.

FIG. 3(a) is a partial cross-sectional schematic diagram of the holding device 200 in a state where the piston rod 211 is extended from the state shown in FIG. 2(a) to the contact position during extension, and FIG. FIG. 2B is a partial cross-sectional schematic diagram of the holding device 200 in a state where the piston rod 211 is retracted from the state shown in FIG. 2(b) to the retracted contact position.

FIG. 4(a) is a schematic diagram of the detection mechanism as seen in the direction of arrow IVa in FIG. 2(a), and FIG. 4(b) is a schematic cross-sectional diagram of the detection mechanism taken along line IVb-IVb in FIG. 4(a). FIG. 4(c) is a schematic diagram of the detection mechanism as viewed in the direction of arrow IVc in FIG. 2(b), and FIG. 4(d) is a schematic diagram of the detection mechanism as viewed from the line IVd-IVd in FIG. 4(c). It is a cross-sectional schematic diagram.

As shown in FIGS. 2 to 4, the cylinder device 210 includes a cylindrical tube 213 in which the piston of the piston rod 211 is slidably disposed, and a rear wall portion 214 that seals the rear end of the tube 213. , a front wall portion 215 that seals the front end of the tube 213 and through which the rod of the piston rod 211 is inserted; a spring member 216 formed as a coil spring and disposed between the front wall portion 215 and the piston; A displacement member 230 that is slidably disposed on the outer peripheral surface of the piston rod 211, a sensor device 240 that detects the displacement member 230, and a sensor device 240 that guides (regulates) the sliding displacement of the displacement member 230 in a direction parallel to the direction of expansion and contraction of the piston rod 211. The displacement member 230, the sensor device 240, and the guide member 250 constitute a detection mechanism.

The displacement member 230 includes a slide body 231 and a protruding rod 232, one end of which is inserted through the slide body 231 and the other end of which is inserted through the front wall portion 215 and protrudes into the cylinder device 210 (tube 213). , is slidably displaced between a light blocking position (one of the first position or the second position) and a light receiving position (the other of the first position or the second position) by receiving an action from the piston rod 211.

Note that the protruding rod 232 is capable of relative displacement (sliding displacement) with respect to the slide body 231 and the front wall portion 215 along a direction parallel to the direction of expansion and contraction of the piston rod 211. Further, the protruding rod 232 has a large diameter portion formed between one end side and the other end side, which is larger in diameter than the one end side and the other end side, and the large diameter portion is formed between the slide body 231 or the front wall portion 215. The relative displacement (sliding displacement) can be regulated by being brought into contact with.

In this way, the displacement member 230 is slidably displaced in a direction parallel to the direction of expansion and contraction of the piston rod 211. For example, compared to a structure in which the displacement member 230 is rotated around a predetermined rotation axis, the displacement member 230 is The space required for the displacement of the tube 230 can be suppressed, and the space on the outer peripheral surface side of the tube 213 can be effectively utilized, and the structure can be simplified by eliminating the need for a rotating shaft.

The piston rod 211 is formed with a piston-side contact portion 211a that comes into contact with one side of the displacement member 230 (the other end (projection end) of the projection rod 232) when the piston rod 211 is extended. , a rod-side contact portion 211b that faces the piston-side contact portion 211a at a predetermined interval and abuts the other side (the side surface of the slide body 231) opposite to the one side of the displacement member 230 when retracted. is formed into a rod.

A first recess 231a and a second recess 231b are provided on the bottom surface of the slide body 231 (the surface facing the outer circumferential surfaces of the tube 213 and the front wall portion 215) at two locations separated by a predetermined interval along the direction of expansion and contraction of the piston rod 211. is recessed (see FIGS. 4(b) and 4(d)), and the ball B of the ball plunger provided on the outer peripheral surface of the front wall portion 215 can be received in the first recess 231a or the second recess 231b. Ru.

Note that when the ball B is received in the first recess 231a, the displacement member 230 is positioned (maintained) at the light-blocking position, and when the ball B is received in the second recess 231b, the displacement member 230 is positioned at the light-receiving position. Positioned (maintained).

The sensor device 240 includes a base body 241 formed in a substantially U-shape, a light emitting section 242 disposed on one of opposing surfaces of the base body 241 facing each other at a predetermined distance, and a light emitting section 242 disposed on the other of the opposing surfaces. , and a light receiving section 243 that receives light emitted from a light emitting section 242.

In the sensor device 240, when the displacement member 230 is placed in the light blocking position, the light emitted from the light emitting section 242 is blocked by the slide body 231, and the light receiving section 243 is unable to receive light. On the other hand, in the sensor device 240, when the displacement member 230 is placed at the light receiving position, the light receiving section 243 can receive the light emitted from the light emitting section 242.

Note that the detection mechanism includes a light shielding plate (not shown) that covers the displacement member 230 and the sensor device 240, so that it is possible to suppress light from outside other than the light emitting section 242 from being received by the light receiving section 243.

Next, the operation of the detection mechanism (looseness detection and pressing detection) will be explained.

When the piston rod 211 is most retracted, the pressing member 217 is placed at the relaxed position and the displacement member 230 is placed at the light shielding position, as shown in FIG. 2(a). When the piston rod 211 is extended from this state and the piston rod 211 is disposed (reached) at the abutting position during extension, as shown in FIG. The piston-side contact portion 211a is brought into contact with the side (the end (projection end) on the other end side of the projection rod 232).

Therefore, when the piston rod 211 is further extended from the contact position during extension, the piston side contact portion 211a presses the displacement member 230, so that the displacement member 230 moves in the same direction (extension direction) as the piston rod 211 is being extended. ) and the piston rod 211 is extended to the maximum extent, the pressing member 217 is placed at the pressing position and the displacement member 230 is placed at the light receiving position, as shown in FIG. 2(b).

That is, until the piston rod 211 is disposed (reached) from the most retracted state to the extended contact position, the displacement member 230 is disposed at the light-blocking position (the light emitted from the light emitting section 242 is not emitted). Just before the piston rod 211 is extended to the maximum, the displacement member 230 is slid and disposed at the light receiving position (the state in which no light is received by the light emitting part 243) is maintained (the state in which no light is received by the light emitting part 242 is switched to a state where the light is received by the light receiving unit 243). Thereby, it is possible to detect that the pressing member 217 is placed at the pressing position (pressing detection).

On the other hand, when the piston rod 211 is in the most extended state, as shown in FIG. 2(b), the pressing member 217 is placed at the pressing position, and the displacement member 230 is placed at the light receiving position. When the piston rod 211 is retracted from this state and the piston rod 211 is disposed (reached) at the retracted contact position, as shown in FIG. 3(b), the displacement member 230 disposed at the light receiving position The rod-side contact portion 211b is in contact with the side (side surface of the slide body 231).

Therefore, when the piston rod 211 is further retracted from the retraction contact position, the rod-side contact portion 211b presses the displacement member 230, so that the displacement member 230 and the retracted piston rod 211 move in the same direction (retraction direction). ), and when the piston rod 211 is retracted the most, the pressing member 217 is placed in the slack position and the displacement member 230 is placed in the light shielding position, as shown in FIG. 2(a).

That is, until the piston rod 211 is disposed (reached) from the most extended state to the retracted contact position, the displacement member 230 is disposed at the light receiving position (the light emitted from the light emitting part 242 is Immediately before the piston rod 211 is most retracted, the displacement member 230 is slid, and the displacement member 230 is placed in the light-blocking position (the state in which light is received by the light-emitting unit 242) is maintained. The light is switched to a state where the light is received by the light receiving unit 243). Thereby, it is possible to detect that the pressing member 217 is placed in a slack position (looseness detection).

Here, as shown in FIG. 2(b), the piston rod 211 in the most extended state (see FIG. 2(b)) receives the elastic recovery force of the spring member 216, and is at the retracted abutment position (see FIG. 3). (b)), the space on the side where the spring member 216 is disposed (the space between the front wall portion 215 and the piston, hereinafter referred to as the "negative pressure space") becomes negative pressure. , there is a risk that the protruding rod 232 may be sucked into the negative pressure space.

In this embodiment, as described above, the protruding rod 232 can be displaced relative to the slide body 231 (sliding displacement), so even if the protruding rod 232 is sucked into the negative pressure space, the slide body 231 It can be maintained at the original position (light receiving position). In other words, the displacement member 230 (sliding body 231) can be suppressed from sliding.

In addition, since the protruding rod 232 is capable of relative displacement (sliding displacement) with respect to the slide body 231, even if the piston and the protruding rod 232 are viscous and fixed due to, for example, grease, they can be easily moved by negative pressure. Similarly, when the piston rod 211 is retracted from the most extended state (see FIG. 2(b)), only the protruding rod 232 is slid and the slide body 231 is returned to its original position (light receiving position). can be maintained.

As described above, according to the detection mechanism of this embodiment, by detecting whether the displacement member 230 is in the light blocking position (or light receiving position), it can be determined whether the pressing member 217 is in the pressing position or the slack position. can be judged. That is, one sensor (sensor device 240) can perform pressing detection and loosening detection.

In this embodiment, when the piston rod 211 is retracted (or extended) approximately 90% of the total stroke from the most extended (or most retracted) state, the slide body 231 moves from the light receiving position to the light blocking position (or The sliding displacement to the opposite direction is started. Note that the timing at which the sliding displacement of the slide body 231 is started is preferably set within a range of about 85% to about 95% of the total stroke. If the value is larger than 95%, the effects of dimensional tolerances of parts, assembly tolerances, variations in slide displacement, etc. will become large, and there is a risk that the switching accuracy of the light receiving state of the sensor device 240 will decrease, while if the value is smaller than 85%. This is because the time lag between placing the pressing member 217 in the pressing position or the loosened position and switching the light receiving state of the sensor device 240 becomes large, and there is a possibility that the detection accuracy between pressing and loosening detection may decrease.

According to the detection mechanism in this embodiment, the displacement member 230 can be maintained at the light receiving position by receiving the ball B of the ball plunger into the first recess 231a or the second recess 231b. Therefore, as described above, even if the protruding rod 232 is displaced relative to the slide body 231 (slide displacement) due to negative pressure or viscous fixation, the slide body 231 can be maintained at the original position (light receiving position). can.

Further, the ball B received in the first recess 231a or the second recess 231b can be easily sunk into the interior as the displacement member 230 is slid. That is, the state in which the displacement member 230 is maintained at the light-blocking position or the light-receiving position can be released by sliding the displacement member 230 under the action of the piston rod 211. There is no need to provide a separate mechanism. Therefore, the structure can be simplified.

Further, since the force required for release can be made relatively small, when the piston rod 211 is retracted by the elastic recovery force of the spring member 216, the retraction of the piston rod 211 is caused by the ball plunger (displacement member) at the end of the retraction. 230 from the light-receiving state to the light-shielding state).

Further, according to the detection mechanism in this embodiment, a part of the displacement member 230 (the other side of the protruding rod 232) is arranged inside the cylinder device 210, and a contact part is formed on the piston of the piston rod 211 when it is extended. (In other words, since the abutment part during extension is disposed inside the cylinder device 210, the dead space inside the cylinder device 210 can be effectively utilized. Therefore, for example, the abutment part during extension is placed on the rod of the piston rod 211. The displacement member 230 (sliding The body 231) can be downsized, and the holding device 200 can be downsized.

Although the present invention has been described above based on the embodiments, the present invention is not limited to the above embodiments, and it is readily understood that various improvements and modifications can be made without departing from the spirit of the present invention. This can be inferred.

The numerical values listed in the above embodiment are merely examples, and it is of course possible to employ other numerical values. Similarly, the number of arrangement of each structure is arbitrary. For example, the number of holding devices 200 provided for one plug door 20 can be set to an arbitrary number.

In the above embodiment, a case has been described in which the piston rod 211 is in the most extended (retracted) state and the displacement member 230 is arranged at the light receiving position (light blocking position). However, this is not necessarily limited to this, and the piston rod The displacement member 230 may be arranged at the light-shielding position (light-receiving position) when the light-emitting element 211 is most retracted (extended).

In the above embodiment, a case has been described in which the sensor device 240 is constituted by an optical sensor, but the invention is not necessarily limited to this. Other types of sensors may be used as long as the detection state can be switched. As another type of sensor, the displacement member 230 is turned on (or turned off) when placed in the light-shielding position in the above embodiment, and turned off (or turned on) when placed in the light receiving position in the above embodiment. ), limit switches and proximity switches are examples.

In the embodiment described above, a part of the displacement member 230 (the other side of the protruding rod 232) is arranged inside the cylinder device 210, and a portion that comes into contact with the other side of the protruding rod 232 (the piston side contact portion 211a) is formed on the piston of the piston rod 211 (the piston side contact portion 211a is arranged inside the cylinder device 210). It may be configured. Note that the same parts as in the above embodiment are given the same reference numerals, and the explanation thereof will be omitted.

That is, in the holding device 2200, the entire displacement member 2230 is disposed outside the cylinder device 210. Furthermore, rod-side contact portions 211b and 2211a are formed on the rod of the piston rod 211 at two locations spaced apart from each other by a predetermined distance, as surfaces facing opposite to each other. When the piston rod 211 is retracted, the rod-side contact portion 211b and when the piston rod 211 is extended, the rod-side contact portion 2211a are respectively applied to one or the other of the mutually opposing surfaces of the displacement member 2230. be touched. According to this modification, there is no need to insert the protruding rod 232 through the front wall portion 215, so the structure can be simplified and manufacturing can be facilitated.

In the above embodiment, a case has been described in which a detection mechanism is provided in a direct-acting pressing device (pressing device 200) that presses the plug door 20 by the pressing member 217 connected to the tip of the piston rod 211, but the detection mechanism is not necessarily limited to this. For example, the detection mechanism may be provided in a rotary pressing device that presses the plug door 20 with a link member (pressing member) that rotates as the piston rod 211 expands and contracts along the longitudinal direction of the vehicle body. In either the direct-acting type or the rotary type pressing device, the direction of expansion and contraction of the piston rod 211 is not limited to the longitudinal direction or the width direction of the vehicle body, but can be set in any direction.

In the embodiment described above, when the pressing device 200 (pressing member 217) presses (moves) the plug door 20 from the closed position to the airtight position (that is, the piston rod 211 is retracted the most and the pressing member 217 is disposed at the slack position). In the above-described state, the plug door 20 is placed in the closed position, the piston rod 211 is extended to the maximum, and the pressing member 217 is placed in the pressing position, in which case the plug door 20 is placed in the airtight position. The present invention is not limited to this, and the plug door 20 is pressed (moved) to a predetermined position between the closed position and the airtight position (i.e., the piston rod 211 is extended the most and the pressing member 217 is placed in the holding position). In this state, the plug door 20 may be placed at a predetermined position. Note that the predetermined position may be either a position where the door frame of the plug door 20 comes into contact with the airtight packing 21 or a position where it does not come into contact with the airtight packing 21.

In the embodiment described above, the structure in which the entrance/exit door 11 is opened and closed by the plug door 20 has been described, but the structure is not necessarily limited to this, and a structure in which the entrance/exit door 11 is opened and closed by a sliding door (sliding door type) may be adopted. In the sliding door type, as in the above embodiment, the sliding door is supported by a support mechanism so as to be movable between the closed position and the open position, and the sliding door in the closed position is supported by the holding device 200. The airtight packing 21 is pressed to the outside of the vehicle body, and the airtight packing 21 is brought into close contact with the door frame of the sliding door.

10 Side structure (body side wall)
11 Entrance/exit 20 Plug door (door)
200, 2200 Holding device 210 Cylinder device 211 Piston rod (rod)
211a Piston side contact part (contact part when extended)
2211a Rod side contact part (contact part when extended)
211b Rod side contact part (contact part during retraction)
217 Pressing member 230, 2230 Displacement member 231 Slide body (displacement member)
231a First recess (first retaining means or second retaining means)
231b Second recess (second retaining means or first retaining means)
232 Projection rod (displacement member, projection part)
240 Sensor device (detection means)
B Ball (first maintenance means, second maintenance means)

Claims (6)

A holding device used in a railway vehicle, comprising a door that opens and closes a boarding door opened in a side wall of the vehicle body, and a support mechanism that supports the door movably between a position where the boarding door is opened and a position where the boarding door is closed. In,
a cylinder device in which the rod is expanded and contracted;
a pressing member connected to the rod and pressing the door toward the outside of the vehicle body as the rod expands;
a displacement member that is displaced between a first position and a second position under the action of the rod;
Detecting means for detecting whether the displacement member is in the first position,
The pressing member is disposed at a relaxed position when the rod is most retracted, and is disposed at a holding position that moves the door most outwardly of the vehicle body when the rod is most extended;
The rod has an extension contact portion that contacts one side of the displacement member when the rod is extended, and a predetermined distance from the extension contact portion, and a contact portion that contacts the one side of the displacement member when retracted. and a retraction contact portion that comes into contact with the other side that is the opposite side,
When the rod is extended from the most retracted state, immediately before the rod is most extended, the displacement member disposed at one of the first position and the second position is By abutting the abutting portion during extension and displacing the displacement member together with the rod being extended, the displacement member is in the first position or the second position when the rod is fully extended. placed on the other side,
When the rod is retracted from the most extended state, immediately before the rod is retracted the most, the other side of the displacement member disposed at the other of the first position or the second position is By abutting the retracting contact portion and displacing the displacement member together with the retracted rod, the displacement member is in the first position or the second position when the rod is most retracted. A holding device characterized in that it is arranged on one side of the holder. a first maintaining means that maintains the displacement member disposed at the first position at the first position and releases the maintenance at the first position when the displacement member receives an action from the rod;
and second maintaining means that maintains the displacement member disposed at the second position at the second position and releases the maintenance at the second position when the displacement member receives an action from the rod. The holding device according to claim 1, characterized in that: 3. The holding device according to claim 1, wherein the displacement member is slidably displaced between the first position and the second position along a direction parallel to an expansion/contraction direction of the rod. The displacement member includes a slide body disposed outside the cylinder device, and a protrusion portion that partially protrudes into the inside of the cylinder device,
The abutment part during extension is disposed inside the cylinder device, and abuts the protrusion part when the rod is extended;
4. The holding device according to claim 3, wherein the retraction contact portion is disposed outside the cylinder device and comes into contact with the slide body when the rod retracts. 5. The holding device according to claim 4, wherein the displacement member is formed such that the slide body and the protrusion are relatively movable along the direction of expansion and contraction of the rod. A door that opens and closes the entrance and exit opening in the side wall of the vehicle;
a support mechanism that movably supports the door between a position in which the doorway is opened and a position in which it is closed;
A railway vehicle comprising the holding device according to any one of claims 1 to 5.

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