JP4846485B2 - Platform step device - Google Patents

Description

  The present invention relates to a platform step device that prevents a passenger from falling between a platform and a stopped vehicle.

2. Description of the Related Art Conventionally, in order to prevent a passenger from falling into a gap between a platform and a stopped vehicle, a platform step device that is driven from the platform side so as to advance a step serving as a passenger's scaffold into the gap is used. In such a platform step device, it is necessary to check the presence or absence of a passenger on the step in order to prevent the step pull-in operation from being erroneously performed when a passenger is present on the step.
As a method of detecting the presence of a passenger, for example, there is a method of detecting a passenger using an optical sensor or the like, but the detection is performed with high accuracy due to a limitation of a mounting position due to restrictions of a vehicle limit and a building limit. It was difficult.

In order to solve such a problem, Patent Document 1 discloses a platform step device in which printed circuit boards 11 and 12 are arranged so as to face each other with a cushion material 13 interposed therebetween. In this platform step device, when a passenger is present on the step, the cushioning material is crushed and the conductive portions of the printed circuit boards 11 and 12 are in contact with each other, so that the presence of the passenger can be detected.
JP 2002-264799 A

  However, the platform step device described in Patent Document 1 causes a malfunction due to contact of a conductive portion in the step due to bending or twisting of the step when the step is advanced or retracted with respect to the vehicle side. there is a possibility. In addition, the cushion material may be plastically deformed by using it for many years, and the conductive part may be brought into close contact, which may cause malfunction.

  In view of the above circumstances, an object of the present invention is to provide a platform step device that can accurately detect the presence or absence of passengers on a step for many years.

Means and effects for solving the problems

The present invention relates to a platform step device that prevents a passenger from falling between a platform and a stopped vehicle.
The platform step device according to the present invention has the following features to achieve the above object. That is, the platform step device of the present invention includes the following features alone or in combination as appropriate.

  In order to achieve the above object, the first feature of the platform step device according to the present invention is a platform step device that prevents a passenger from falling between the platform and the stopped vehicle, and can be embedded in the platform. A case, a step supported by the case, a driving means for moving the step relative to the case so as to advance or retreat to the vehicle side, and a step perpendicular to the step advanced to the vehicle side. And a load cell arranged to detect a load acting downward in the direction.

  According to this structure, the load which a passenger loads with respect to the step of the state which advanced to the vehicle side can be detected with a load cell. Thus, since it is the structure which can detect a load with a load cell, unlike the conventional structure which requires a deformation | transformation of a cushioning material, it becomes possible to reduce a deformation | transformation of a detection mechanism. Therefore, it is difficult to be affected by aging deterioration, and it is possible to detect the presence or absence of passengers on a step with high accuracy over many years.

  The second feature of the platform step device according to the present invention is further provided with a frame-like frame supported by the case, wherein the step is supported by the frame, and the driving means includes the frame. The load cell is arranged between the step and the frame so that the load cell is sandwiched between the step and the frame when a load is applied vertically downward with respect to the step. It is established.

  According to this configuration, the step does not move relative to the frame in the forward / backward direction. Therefore, by placing the load cell between the step and the frame, the load cell does not move relative to the step and the frame. Therefore, there is no variation in detection due to the movement of the step in the forward / backward direction, and more stable load detection is possible. In addition, since the load cell is sandwiched between the step and the frame, manufacturing is easy.

  Further, a third feature of the platform step device according to the present invention is that the step is attached to the frame with the vicinity of the end portion on the vehicle side as an attachment portion, and the load cell extends from the attachment portion to the side opposite to the vehicle. It is arrange | positioned in the position distant from.

  According to this configuration, since the step is attached to the frame, the position of the step with respect to the frame is fixed. At this time, if the passenger gets on the step at a position away from the mounting part on the side opposite the vehicle, the load cell installed between the step and the frame is sandwiched and the load is detected, so the passenger on the step is detected. can do. In this way, the step and the frame can be securely fixed without hindering the function of detecting the presence or absence of a passenger.

  A fourth feature of the platform step device according to the present invention is that the platform includes a guide portion that restrains the movement of the step in the horizontal direction relative to the frame and permits the movement in the vertical direction.

  According to this configuration, the direction in which the force acts on the load cell can be regulated, so that the load cell is unlikely to fail and passengers can be detected with higher accuracy over a longer period.

  The fifth feature of the platform step device according to the present invention is further provided with drive control means for controlling the drive of the drive means, and the drive control means is detected by the load cell in the absence of passengers on the step. When a reference load for determining the presence or absence of a passenger on the step is determined based on the loaded load, and the load detected by the load cell is larger than the reference load in a state where the step is advanced The step is to control the driving means so as not to move forward and backward.

  According to this structure, the reference | standard load for judging the presence or absence of the passenger on a step is determined based on the load when there is no passenger on a step. When the load detected by the load cell is larger than the reference load, it is determined that the passenger is on the step, and the step advance / retreat can be stopped. In this case, even when the step or the frame is bent or twisted, the reference load is determined based on the load when there is no passenger on the step in the state (the state where there is deflection or twist). Therefore, the presence or absence of passengers on the step can be reliably determined even when there is a step or frame bending or twisting. Therefore, it is possible to reliably prevent the step from moving when there are passengers on the step.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.

  FIG. 1 is an overall schematic view of a platform on which a platform step device (hereinafter referred to as a step device) according to an embodiment of the present invention is installed. FIG. 1 shows a state in which the step device 1 is applied together with a movable fence type home door device 200 (APG) capable of automatically opening and closing the fence 201. As shown in FIG. 1, the step device 1 installed on the platform 100 can move the step 7 forward and backward with respect to the vehicle side. Thereby, it is possible to prevent the passenger from falling between the platform 100 and the stopped vehicle.

2 and 3 are plan views of the step device 1 shown in FIG. FIG. 2 is a diagram showing a state where step 7 is in the retracted position retracted with respect to the vehicle (hereinafter referred to as the retracted state), and FIG. 3 is a state where step 7 is in the advanced position where the vehicle is advanced with respect to the vehicle (hereinafter referred to as the retracted state). FIG.
FIG. 4 is a schematic view of the step device 1 in FIG. 2 and FIG. FIG. 4A is a diagram showing the retracted state, and FIG. 4B is a diagram showing the advanced state. FIG. 5 is an enlarged schematic view of the vicinity of the step in FIG.

  The step device 1 includes a case 2 that can be embedded in the platform 100, a step 7 that is supported by the case 2 so as to be able to move forward and backward with respect to the vehicle side, and a step device 1 that is installed in the case 2 and moves forward and backward with respect to the vehicle side Drive means 17, 18, 19 (see FIG. 2, details will be described later) having a rack and pinion mechanism for movement are provided. Furthermore, as will be described later, the load cell 30 is provided so as to be able to detect a load acting downward in the vertical direction with respect to the step 7 that has advanced to the vehicle side (see FIGS. 4 and 5).

  The step device 1 is installed in a recess 100a formed at an end of the platform 100 facing the vehicle (see FIG. 4). The recess 100a is formed by cutting, for example, concrete forming the platform 100 into a rectangular shape. The bottom surface of the recess 100a is an installation surface for installing the step device 1, and the upper surface and the vehicle side are open.

  The case 2 constituting the step device 1 is fixed to the recess 100a by a plurality of flat base plates 3, side plates 4 forming the other three sides excluding the surface facing the vehicle, and anchors. A bottom plate 5 and a top plate 6 (not shown in FIGS. 2 and 3) that serve as a tread for passengers are provided.

  The plurality of base plates 3 are fixed to the bottom plate 5 by attachment members such as screws or welding. Further, the side plate 4 having a “U” -shaped cross section is fixed to the three sides of the four sides of the bottom plate 5 excluding the side on the vehicle side by welding (see FIG. 4). Further, the top plate 6 is fixed to the upper side of the side plate 4 with bolts. The top plate 6 forms a part of the upper surface of the platform 100 when the case 2 is installed in the recess 100a.

  Further, the top plate 6 is formed with a guide groove 6a extending in parallel with the direction along the platform. The guide groove 6a is an opening that penetrates the top plate 6, has a shape in which the top plate is bent vertically downward at the opening edge (see FIG. 4), and the fence 201 of the platform door device 200 (FIG. 1). (See below) can be moved along the guide groove 6a.

  As described above, the box-shaped case 2 having an opening on the vehicle side is configured. The case 2 can be embedded in the platform 100 by being installed in the recess 100a.

  And the horizontal flat step 7 is supported with respect to case 2 (it shows with the dashed-two dotted line in FIG.2 and FIG.3). As shown in FIG. 5, this step 7 is attached to the frame 8 with the lower surface in the vicinity of the end on the vehicle side as the attachment portion 7a. Specifically, one end of the support member 14 formed by bending 90 degrees is fixed to the attachment portion 7a of Step 7 by an attachment member 15a such as a bolt, and the other end is attached to the vehicle side end portion of the frame 8 such as a bolt. It is fixed by the attachment member 15b.

  At this time, step 7 is installed so that the upper surface is positioned substantially horizontally with the top board 6 from the viewpoint of ease of walking for passengers. Further, it is fixed between the lower surface of step 7 and the frame 8 so as to have a predetermined gap in the vertical direction. The predetermined gap is preferably a gap having an interval corresponding to the height of the load cell 30 described later. The step 7 and the frame 8 are attached by using the support member 14 and the attachment members 15a and 15b at a plurality of positions in the direction along the platform.

  A load cell 30 is disposed in a gap formed between the step 7 and the frame 8. The load cell 30 is disposed on the frame 8 at a position away from the mounting portion 7a of step 7 on the side opposite to the vehicle. On the frame 8, guide portions 31 and 32 that restrict the movement of the step 7 in the horizontal direction with respect to the frame 8 and allow the movement in the vertical direction are provided before and after the load cell 30 in the forward and backward direction. ing. The guide portions 31 and 32 are formed so that the cylindrical protrusion portions 31a and 32a protrude toward the frame side on the lower surface of Step 7 and the protrusion portions 31a and 32a are slidable in the vertical direction on the upper surface of the frame 8. It consists of cylindrical guide frames 31b and 32b.

  When a downward force is applied to the step 7 in the vertical direction, the load cell 30 is sandwiched between the step 7 and the frame 8 and receives a compression load. That is, the load cell 30 is disposed so as to be able to detect a load acting downward in the vertical direction with respect to the step 7 that has advanced to the vehicle side. Therefore, in a state where the passenger is on Step 7, a predetermined load is detected by the load cell 30, and the presence or absence of the passenger on Step 7 can be determined.

  Thus, since it is the structure which can detect a load with the load cell 30, deformation | transformation of step 7 etc. required in order to detect a load can be decreased. Therefore, it is difficult to be affected by aging deterioration, and it is possible to detect the presence or absence of passengers on Step 7 with high accuracy over many years.

Further, since step 7 is fixed to the frame 8 at the attachment portion 7a at the end on the vehicle side, it is possible to prevent step 7 from being detached from the frame 8. At this time, when the passenger gets on Step 7 at a position away from the mounting portion 7a on the side opposite to the vehicle, the load cell 30 installed between Step 7 and the frame 8 is sandwiched and the load is detected. passengers on 7 can be detected. Since the attachment portion 7a is an end portion on the vehicle side of Step 7, it is possible to detect a load acting downward in the vertical direction in a wide range on Step 7. Thus, by attaching to the frame 8 at the end of the vehicle side of step 7, it becomes possible to reliably fix the step 7 and the frame 8 without hindering the function of detecting the presence or absence of passengers. .

  Further, when a load is applied to step 7, the movement of step 7 in the vicinity of the load cell 30 positioned between the guide portion 31 and the guide portion 32 can be restricted in the vertical direction by the guide portions 31 and 32. . That is, since the direction in which the force acts on the load cell 30 can be regulated in the vertical direction, it is possible to prevent the load cell 30 from being loaded with a load inclined from the vertical direction. As a result, the load cell 30 is unlikely to fail, and passengers can be detected with higher accuracy for a longer period of time.

  The frame 8 has a frame-like configuration in which a plurality of rectangular bar-like members arranged in parallel to the surface of the bottom plate 5 are fixed to each other by welding or the like. Specifically, as shown in FIGS. 2 and 3, the frame 8 includes parallel support members 81 a to 81 e that extend parallel to the direction in which the step 7 advances and retreats with respect to the vehicle, and perpendicular to the parallel support member. It consists of vertical support members 82a-82f that extend (parallel to the direction along the platform).

  2 and 3, the parallel support members 81a and 81b located in the region from the left side surface of the step device 1 are connected and supported by the vertical support member 82a in the vicinity of the center in the longitudinal direction, and the end portion on the side opposite to the vehicle Are connected and supported by the vertical support member 82b. Similarly, the parallel support members 81c and 81d located in the region from the right side surface of the step device 1 are connected and supported by vertical support members 82e and 82f. The parallel support members 81b and 81c are connected and supported by the vertical support member 82c near the center in the longitudinal direction. A parallel support member 81e is connected to the vertical support member 82c so as to extend toward the opposite side of the vehicle in the vicinity of the center in the longitudinal direction. Further, the vertical support member 82d supports the end of the parallel support member 81e on the side opposite to the vehicle and the end of the parallel support 81b on the side opposite to the vehicle.

  Four slide rails 83a, 83b, 83c, 83d extending in parallel with the parallel support member are fixed to the bottom plate 5 of the case 2. The parallel support members 81a, 81b, 81c, and 81d are slidably supported along the slide rails 83a, 83b, 83c, and 83d, respectively. Specifically, the slide rails 83a to 83d have grooves extending in the longitudinal direction on the side surfaces, and the protrusions formed on the side surfaces of the parallel support members 81a to 81d are supported on the slide rails while being supported by the grooves. Will move along. A guide roller such as a cam follower can be attached to the side surfaces of the parallel support members 81a to 81d and moved along the groove. As a result, the step 7 and the frame 8 can be moved back and forth from the platform 100 side to the vehicle side by driving a motor unit 17 described later.

  A lock mechanism 20 capable of restraining the forward / backward movement of the frame 8 is installed on the base plate 3 at a position in the case 2 that is close to the end on the side opposite to the vehicle. The lock mechanism 20 is engaged with an engagement portion 8a formed integrally with the frame 8, for example, by projecting / retracting the engagement metal fitting by a solenoid method, so that the frame 8 is retracted in the advanced state. And the movement of the frame 8 in the advance direction in the retracted state can be restrained.

  The base plate 3 of the case 2 is provided with a top plate support 9 capable of supporting a load acting downward in the vertical direction via the top plate 6. As shown in FIG. 4, the top plate support 9 is installed at a position in the case 2 that is close to the end on the side opposite to the vehicle, and is arranged so that the direction parallel to the advancing / retreating direction of Step 7 is the longitudinal direction. ing. The top plate support 9 is a plate bent in a “U” shape so that both ends are fixed to the base plate 3 with bolts or the like, and the central portion is lifted from the base plate 3 and supported in contact with the top plate 6. It is formed as a shaped member. The vertical support members 82b, 82d and 82f of the frame 8 are located between the top plate support 9 and the base plate 3 and can move in the forward and backward directions.

Next, a configuration for advancing and retracting step 7 with respect to the vehicle side will be described. As shown in FIGS. 2 and 3, a motor unit 17 (driving means) is fixed near the end of the base plate 3 constituting the case 2 on the side opposite to the vehicle. The motor unit 17 has an integrated configuration of an electric motor and a speed reducer that decelerates rotation of the motor shaft and increases torque, and is arranged with its drive output shaft (drive shaft) directed in the vertical direction. . A pinion gear 18 (drive means) is fixed to the drive output shaft. On the other hand, a rack 19 (driving means) is fixed to the parallel support member 81e of the frame 8 to which the step 7 is fixed so as to mesh with the pinion gear 18, and the pinion gear 18 is rotated by driving the electric motor. Thus, the step 7 can be moved relative to the case 2 so as to advance or retreat with respect to the vehicle side. That is, driving means such as the motor unit 17 can move the step 7 forward and backward with respect to the vehicle via the frame 8.

  In addition, the electric motor is configured as a motor with a brake having a mechanical brake capable of braking the rotation of the drive output shaft due to an external force when the drive is stopped, and step 7 can be held at the stop position in the event of a power failure or abnormality. it can. As a result, it is possible to prevent the step 7 from inadvertently protruding and retracting, and to increase the safety of passengers.

  The drive means is not limited to the one using the rack and pinion mechanism as described above, and the pulley fixed on the belt is moved forward and backward by rotating the pulley using an electric motor and running the belt wound around the pulley. It is also possible to make it a structure to move.

  As described above, since step 7 is moved forward and backward through the frame 8, step 7 does not move relative to the frame 8 in the forward and backward direction. Therefore, the load cell 30 is not moved relative to the step 7 and the frame 8 by arranging the load cell 30 between the step 7 and the frame 8. Therefore, even if step 7 moves in the forward / backward direction, the positional relationship in the forward / backward direction of step 7 / frame 8 / load cell 30 does not change, and the occurrence of variations in detection is reduced. Therefore, more stable load detection is possible. In addition, since the load cell 30 is sandwiched between the step 7 and the frame 8, the manufacturing is easily possible.

  The base plate 3 constituting the case 2 is provided with retracted position stoppers 11a and 12a and advance position stoppers 11b and 12b. The base plate 3 is provided with a retract position detection sensor 13a and an advance position detection sensor 13b. For example, proximity switches are used as these sensors, and when the vertical support member 82b approaches a predetermined position, a detection signal is generated, and the rotation of the electric motor can be stopped and the movement of the frame 8 can be stopped. The retraction position stoppers 11a and 12a and the advance position stoppers 11b and 12b restrain movement of the vertical support members 82b and 82f in the advance and retreat directions, thereby preventing excessive movement in the advance direction and the retreat direction due to malfunction.

  For example, when step 7 moves in the retracting direction, as shown in FIGS. 2 and 4A, the vertical support members 82b and 82f are stopped in contact with the retracting position stoppers 11a and 12a. When step 7 moves in the advance direction, the vertical support members 82b and 82f stop in contact with the advance position stoppers 11b and 12b as shown in FIGS.

Next, the drive control in step 7 will be described.
FIG. 6 is a block diagram showing an outline of the platform step device 1 according to the embodiment of the present invention.

The load cell 30 installed in step 7 is composed of a strain gauge, an amplifier, and the like, and an electric signal corresponding to the load loaded in step 7 is transmitted from the load cell 30 to the control panel 40 (drive control means). In addition, an electrical signal indicating that Step 7 has reached the advanced position or the retracted position is transmitted from the advanced position detection sensor 13b and the retracted position detection sensor 13a to the control panel 40.
The control panel 40 can communicate with an APG individual control panel 50 for controlling the opening and closing of a movable fence installed on the platform, a vehicle control system, and the like.

  The control panel 40 can drive the electric motor 17a (driving means) based on the above-described signal and move the step 7 forward and backward by the mechanism of the pinion gear 18 and the rack 19. Further, it is possible to operate the lock mechanism 20 in the advanced state or retracted state in Step 7 to set the locked state in which the forward / backward movement in Step 7 is restrained.

Specific control will be described with reference to the flowcharts of FIGS.
FIG. 7 is a flowchart showing the control when the platform step device 1 is powered on. As will be described later, in order to determine the presence or absence of a passenger on step 7 when the vehicle arrives, it is necessary to set a reference load W0 as a reference for the determination. Therefore, when the power is turned on, a load applied to the load cell 30 in a state where no passenger is present is detected, and the reference load W0 is determined from the load.

As shown in FIG. 7, first, when the power is turned on in step 101 (hereinafter also referred to as S101, other steps are also referred to), the control motor 40 causes the electric motor 17a to move the step 7 in the advance direction. Driven (S102).
The control panel 40 drives the electric motor 17a until step 7 moves to the advanced position (S103). Here, as described above, the advance position detection sensor 13b is set so that the frame 8 that moves together with the step 7 generates a detection signal (turns ON) when the (vertical support member 82b) reaches the advance position. . If the advance position detection sensor 13b is OFF, the control panel 40 continues to drive the electric motor 17a as it is (S103: NO → S102), and stops driving the electric motor 17a when the advance position detection sensor 13b is turned ON. (S103: YES → S104).

  When step 7 reaches the advanced position, the load applied to the load cell 30 in that state is measured (S105), and the measured value is stored in the storage device in the control panel 40 (S106). As will be described later, a reference load W0 for determining the presence or absence of a passenger on step 7 is newly determined based on the actual measurement value.

Thereafter, the electric motor 17a is driven by the control panel 40 so as to move step 7 in the retracting direction (S107).
The control panel 40 drives the electric motor 17a until step 7 moves to the retracted position (S108). Here, as described above, the retracted position detection sensor 13a is set so that the frame 8 that moves together with the step 7 generates a detection signal (turns ON) when the (vertical support member 82b) reaches the retracted position. . If the retracted position detection sensor 13a is OFF, the control panel 40 continues to drive the electric motor 17a as it is (S108: NO → S107), and stops driving the electric motor 17a when the retracted position detection sensor 13a is turned ON. (S108: YES → S109).

  In this way, by updating the reference load W0 when the power is turned on, for example, the deflection of the step 7 or the frame 8 occurs during the previous driving, and the load applied to the load cell 30 changes in the absence of passengers. Even in such a case, it is possible to determine whether or not there is a passenger on Step 7 in consideration of the change in the load, so that it is possible to suppress erroneous determination.

  In addition, the measurement of the load applied to the load cell when there is no passenger on the step as shown in FIG. 7 is not limited to when the power is turned on, and a measurement switch or the like for performing the measurement of the load is provided. It is also possible. In this case, when necessary, the operator can perform load measurement by pressing the measurement switch and newly determine the reference load W0.

FIG. 8 is a flowchart showing the drive control in step 7 when the vehicle arrives.
As shown in FIG. 8, when the vehicle arrives at the platform (S201), a step advance command signal is transmitted to the control panel 40 from, for example, the APG individual control panel 50 or the control system on the vehicle side (S202). Upon receiving this signal, the control panel 40 drives the electric motor 17a so as to move step 7 in the advance direction. Specifically, as in steps S102 to S104 in FIG. 7, the control panel 40 drives the electric motor 17a until step 7 moves to the advanced position (S203 to S205). That is, if the advance position detection sensor 13b is OFF, the control panel 40 continues to drive the electric motor 17a as it is (S204: NO → S203), and drives the electric motor 17a when the advance position detection sensor 13b is turned ON. Control is made to stop (S204: YES → S205).

  When step 7 reaches the advance position and driving of the electric motor 17a stops, a step advance signal is transmitted from the control panel 40 to, for example, the APG individual control panel 50 (S206). The APG individual control panel 50 can open and close the movable fence based on this signal. The signal is also transmitted to the vehicle control system via the APG individual control panel 50 or directly, and the opening / closing operation of the vehicle door can be performed based on this signal.

  When the series of operations on the APG and the vehicle side is completed, a step withdrawal command signal is transmitted to the control panel 40 from, for example, the APG individual control panel 50 or the vehicle-side control system (S207). The control panel 40 that has received the evacuation command signal compares the load W measured by the load cell 30 after receiving the signal with a reference load W0 determined based on an actual measurement value measured in advance when the power is turned on ( S208). The comparison of the load is performed by comparing electrical measurement values (for example, voltage values). When the load W detected by the load cell 30 is larger than the reference load W0, it is determined that there is a passenger on the step 7, and the electric motor 17a is controlled to be maintained in a stopped state (S208: YES). When the load W detected by the load cell 30 is equal to or less than the reference load W0 (S208: NO), it is determined that there is no passenger on Step 7, and the electric motor 17a is driven so as to move Step 7 in the retreat direction. (S209).

  In addition, the detection of the load by the load cell 30 in S208 is not limited to the case where the presence or absence of passengers is determined based on the instantaneously measured load, but the measured load based on the result of detecting the load continuously for a certain period of time. It is also possible to control so that the electric motor 17a is driven only when is less than the reference load W0.

  The reference load W0 is determined, for example, as a value that is larger by a predetermined amount α than the actually measured value when there is no passenger on Step 7. When there are no passengers on Step 7, the load acting on the load cell 30 increases due to variations in measurement values caused by environmental influences such as rain and wind, and it is not erroneously determined that there are passengers. Thus, it is desirable to set the predetermined amount α larger than the width of the variation.

  The control panel 40 drives the electric motor 17a so as to move step 7 in the retracted direction, and then drives the electric motor 17a until step 7 moves to the retracted position, similarly to steps S107 to S109 in FIG. (S209 to S211). That is, if the retracted position detection sensor 13a is OFF, the control panel 40 continues to drive the electric motor 17a as it is (S210: NO → S209), and drives the electric motor 17a when the retracted position detection sensor 13a is turned ON. Control is made to stop (S210: YES → S211).

  When step 7 reaches the retracted position and driving of the electric motor 17a is stopped, a step retract signal is transmitted from the control panel 40 to, for example, the APG individual control panel 50 (S212). The APG individual control panel 50 can open and close the movable fence based on this signal. The signal is also transmitted to the vehicle control system via the APG individual control panel 50 or directly, and it is possible to open and close the vehicle door and drive the vehicle forward based on this signal. is there.

  As described above, the control panel 40 determines the presence or absence of a passenger on the step 7 based on the load detected by the load cell 30 (the load measured when the power is turned on) in the state where there is no passenger on the step 7. When the load W0 is determined and the load W detected by the load cell 30 is larger than the reference load W0 in the state where the step 7 is advanced, the electric motor 17a is controlled so that the step 7 does not move forward and backward.

  Therefore, even when the load is applied to the load cell 30 despite the fact that there are no passengers on the step 7 due to the influence of the bending or twisting of the step 7 or the frame 8 caused by, for example, deterioration over time. The reference load W0 is determined on the basis of this state (the load cell 30 is loaded but no passenger is present on step 7).

  Therefore, the presence or absence of a passenger on step 7 can be reliably determined even if there is an influence such as bending or twisting of step 7 or frame 8. Therefore, step 7 moves when there are passengers on step 7, and the step advancement state is maintained without performing the retreat movement even though there are no passengers on the step and the step can be retreated. Can be reliably prevented.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made as long as they are described in the claims.

(1) It is not restricted to the case where the load cell 30 is installed in each of four places of the frame 8 (parallel support members 81a to 81d). For example, you may install in two places of the parallel support members 81a and 81d of the both ends in the direction along a platform. In this case, the number of load cells installed can be reduced, which is economical and is installed symmetrically, so that the load applied from the step can be stably detected.

(2) Not only when the load cell is installed between the step and the frame, the load cell can be embedded in the step so that a load acting vertically downward with respect to the upper surface of the step is loaded. .

It is the whole platform schematic diagram which installed the platform step device concerning the embodiment of the present invention. It is a top view of the step apparatus shown in FIG. 1, and is a figure which shows the state which step retracted | retracted with respect to the vehicle. It is a top view of the step apparatus shown in FIG. 1, and is a figure which shows the state which the step advanced with respect to the vehicle. It is a schematic diagram of an AA cross-sectional view of the step device shown in FIGS. 2 and 3. FIG. 5 is an enlarged schematic view of the vicinity of a step in FIG. It is a block diagram which shows the outline of the step apparatus for platforms which concerns on embodiment of this invention. It is a flowchart which shows the control at the time of power activation of the step apparatus for platforms. It is a flowchart which shows the drive control of the step when a vehicle arrives.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Platform step apparatus 2 Case 7 Step 8, 81a-81e, 82a-82f Frame 11a Retraction position stopper 12a Advance position stopper 13a Retraction position detection sensor 13b Advance position detection sensor 17 Motor unit (driving means)
18 Pinion gear (drive means)
19 racks (drive means)
20 Lock mechanism 30 Load cell 31, 32 Guide part 40 Control panel (drive control means)
100 platform

Claims (4)

A platform step device for preventing a passenger from falling between a platform and a stopped vehicle,
A case that can be embedded in the platform;
A step supported by the case;
Driving means for moving the step relative to the case so as to advance or retreat the vehicle side;
A load cell arranged to detect a load acting downward in the vertical direction with respect to the step advanced to the vehicle side;
A frame-like frame supported by the case;
Equipped with a,
The step is supported by the frame;
The driving means moves the step forward and backward through the frame,
The load cell is disposed between the step and the frame so that the load cell is sandwiched between the step and the frame when a load is applied vertically downward with respect to the step. Platform step device. The step is attached to the frame with the vicinity of the end on the vehicle side as an attachment portion,
The platform step device according to claim 1 , wherein the load cell is disposed at a position away from the mounting portion on the side opposite to the vehicle. Platform for steps according to claim 1 or claim 2, characterized in that it comprises a guide portion for allowing movement in the vertical direction while restraining the movement in the horizontal direction with respect to the frame of the step. Drive control means for controlling the drive of the drive means,
The drive control means includes
Based on the load detected by the load cell in the absence of passengers on the step, determine a reference load for determining the presence or absence of passengers on the step,
The drive means is controlled so that the step does not move forward and backward when the load detected by the load cell is larger than the reference load in the state where the step is advanced. Item 4. The platform step device according to item 3 .

Images