Retractable platform safety barriers

Abstract

To provide a technique for achieving an elevation type platform fence for preventing a child from passing through and giving easy recognition to a blind person by reducing a gap between a rope at the lowest part and a platform, and providing a smooth elevating operation of the rope and good visibility from a conductor.SOLUTION: In an interval adjustment mechanism part 50 of an elevation type platform fence 2, 1) a plurality of links 64 are connected in a polygonal line shape, 2) a guide part 63 guides vertical movement while every other joint part 65 supports each of blockage parts 6, 3) the joint part 65 of the uppermost end is fixed at a predetermined position, and 4) the joint part 65 of the lowermost end is connected to a driving belt 33. The driving belt 33 is put around a driving pulley 31, and upper driven pulleys 42, 43 and lower driven pulleys 44, 45 in an elevation part 20.SELECTED DRAWING: Figure 4

Description

Technical Field

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[0001] The present invention relates to a liftable home fence.

Background Art

[0002] As a home fence for preventing passengers from falling from the platform of a railway station onto the track, there is a liftable home fence that opens and closes by raising and lowering a blocking portion such as a rod or a rope.

[0003] As a liftable home fence, for example, the form disclosed in FIG. 2 of Patent Document 1 is known. Since the liftable home fence does not store a rope, a pocket portion like that of a sliding door type home fence is not required, and the opening (the interval between columns) through which passengers pass can be made wider. Therefore, even if the stop position of the train with respect to the platform of the train deviates slightly from the specified position, it is difficult for boarding and alighting to be hindered. Also, the interval for installing columns on the platform can be easily changed according to the length of the platform.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Two embodiments are described in Patent Document 1. In the method of the first embodiment described in FIG. 2 and the like, when the lifting part rises, the rope intervals become narrower in order from the lower rope and it rises, and when the lifting part descends, the rope intervals become wider in order from the upper rope and it descends. In the method of the first embodiment of Patent Document 1, the larger the number of ropes, the larger the lifting part required, so it becomes difficult for the conductor to check the presence or absence of passengers near the home fence when the home fence is fully open.

[0006] On the other hand, the second embodiment described in Figure 5 of Patent Document 1, etc., has a more complex mechanism than the first embodiment. Therefore, because it requires a larger lifting mechanism than the first embodiment, it becomes more difficult for the conductor to check for the presence or absence of passengers near the platform gate when the platform gate is fully open than it is with the first embodiment.

[0007] Furthermore, the two embodiments described in Patent Document 1 both involve installing a relatively large, standalone lower roller within the lifting mechanism, which necessitates raising the lowest rope position to a certain extent. As a result, even when the platform barrier is fully closed, the gap between the platform and the lowest rope becomes large. Consequently, there is a drawback in that it is difficult for visually impaired passengers using white canes to locate the rope with the tip of their cane. In addition, because the lower roller is required, it is difficult to further lower the lowest rope position to prevent children from passing through.

[0008] The problem that this invention aims to solve is to provide a retractable platform safety barrier that reduces the gap between the lowest rope and the platform, prevents children from passing through, is easily recognizable by the visually impaired, has smooth rope raising and lowering operation, and is also easily visible to train conductors. [Means for solving the problem]

[0009] The first invention for solving the above problems is a lifting type platform fence comprising: a support column having a drive unit and a drive pulley rotated by the drive unit; a lifting unit having an upper driven pulley and a lower driven pulley and supporting a plurality of barrier sections; and a drive belt stretched between the drive pulley, the upper driven pulley, and the lower driven pulley, wherein the drive belt is driven by the rotation of the drive pulley, and the lifting unit moves up and down relative to the support column, thereby raising and lowering the plurality of barrier sections, wherein the lifting unit is linked to the raising and lowering of the plurality of barrier sections. The platform screen door is a retractable platform screen door having a spacing adjustment mechanism that changes the width, the spacing adjustment mechanism being an expandable link mechanism in which a plurality of links are connected linearly, the expandable link mechanism having N joints (where N is an odd number) each supporting one of the barrier sections, a joint fixing section that fixes the uppermost joint of the expandable link mechanism at a predetermined position within the lifting section, a joint connecting section that connects the lowermost joint of the expandable link mechanism to the drive belt, and a guide section that guides the vertical movement of M joints (where M is an odd number).

[0010] The second invention is a retractable platform safety barrier of the first invention, wherein the upper driven pulley has a plurality of pulleys arranged apart in the direction of link oscillation of the telescopic link mechanism, and the lower driven pulley has a plurality of pulleys arranged apart in the direction of link oscillation of the telescopic link mechanism.

[0011] The third invention is a retractable platform screen door according to the first or second invention, wherein the drive belt is an annular belt wrapped around the drive pulley, the upper driven pulley, and the lower driven pulley.

[0012] The fourth invention is a lifting platform fence according to any one of the first to third inventions, wherein the guide portion comprises a linear guide hole opening in the housing of the lifting portion along the vertical direction, and a slider portion that slides along the linear guide hole, wherein the joint portions at intervals of M are rotatably connected to a plurality of slider portions.

[0013] The fifth invention is a retractable platform screen door according to any of the first to fourth inventions, where N is 1 and M is 1. [Effects of the Invention]

[0014] According to an embodiment of the present invention, the retractable platform screen door can extend and retract its telescopic link mechanism vertically in accordance with the movement of the barrier section as the retractable section moves up and down. When the retractable section rises, the distance between the link ends (i.e., the distance between the barrier sections) decreases, and when the retractable section descends, the distance between the link ends increases. Compared to Patent Document 1, the size of the links within the retractable section can be smaller, thus preventing the retractable section from becoming larger.

[0015] Furthermore, by using multiple pulleys for both the upper and lower driven pulleys, the diameter of each pulley can be reduced. This allows the position of the lowest barrier section to be lowered, thereby reducing the gap between the platform and the lowest barrier section.

[0016] Therefore, by reducing the gap between the lowest rope and the platform, it is possible to realize a retractable platform fence that prevents children from passing through, is easily recognizable by the visually impaired, has smooth rope raising and lowering operation, and is also easily visible to train conductors.

[0017] Furthermore, according to the embodiment of the present invention, the vertical spacing between multiple barrier sections can be expanded or contracted using an expandable link mechanism in which links are linearly connected. Due to its simple structure, it is lightweight yet highly reliable. Since the expandable link mechanism connects all the barrier sections, it is difficult to move only some of the barrier sections, and it is difficult to move some of the barrier sections and pass through the platform fence when it is fully closed. In other words, it is highly safe as a protective fence. [Brief explanation of the drawing]

[0018] [Figure 1] A front view from the platform side showing the fully closed position of the retractable platform screen doors. [Figure 2] A front view from the platform side showing the fully extended position of the retractable platform screen doors. [Figure 3] A diagram showing a structural example of a support column, which is an internal structure diagram in side view seen from the longitudinal direction of the blocking portion in the fully closed state. [Figure 4] A sectional view taken along the line IV-IV of FIG. 3 as seen from the home side of the lifting unit in the fully closed state. [Figure 5] A diagram showing a structural example of a lifting part, which is a ZY sectional view seen from the +X-axis side of the lifting part in the fully closed state. [Figure 6] A sectional view taken along the line IV-IV of FIG. 3 as seen from the home side of the lifting unit in the fully open state. [Figure 7] An XZ sectional view showing a structural example of a lifting type home fence which is the first modification. [Figure 8] A YZ sectional view showing a structural example of a lifting type home fence which is the first modification. [Figure 9] A YZ sectional view showing a structural example of a lifting type home fence which is the second modification.

MODE FOR CARRYING OUT THE INVENTION

[0019] Hereinafter, an example of an embodiment of the present invention will be described. Needless to say, the form to which the present invention can be applied is not limited to the following embodiments. In addition, a common right-handed orthogonal three-axis is shown in each figure. The X-axis is a horizontal axis along the longitudinal direction of the platform 3. The Y-axis is a horizontal axis along the direction from the home side to the track side. The Z-axis is a vertical axis along the up-and-down height direction. The +X-axis direction is called "right", the -X-axis direction is called "left", the +Z-axis direction is called "up", and the -Z-axis direction is called "down".

[0020] FIG. 1 is a front view seen from the home side showing the fully closed state of the lifting type home fence 2. FIG. 2 is a front view showing the fully open state of the lifting type home fence 2. The fully open state is a state in which the opening of the lifting type home fence 2 is fully opened.

[0021] The retractable platform screen door 2 is a platform screen door that opens and closes by moving multiple barrier sections 6 between adjacent retractable units 4 (4a, 4b) erected on the upper surface of the platform 3 and moving them up and down. In Figures 1 and 2, only two retractable units 4 are shown, but in actual operation, two or more retractable units 4 are erected along the longitudinal direction of the platform 3 at the track-side end of the platform 3. Also, in Figures 1 and 2, the distance between the left retractable unit 4a and the right retractable unit 5b is shown as short for illustrative purposes, but it is possible to set a wider distance.

[0022] The barrier 6 is a blocking member that, when fully closed, blocks the space between the track side and the platform side, preventing people from passing between adjacent lifting units 4. For example, the barrier 6 can be implemented using a linear member such as a rope, chain, or rod.

[0023] The lifting unit 4 includes a support column 10 erected on the upper surface of the platform 3, and a lifting section 20 that moves up and down relative to the support column 10. The sliding mechanism and lifting mechanism of the lifting section 20 relative to the support column 10 can be applied using prior art, and are therefore not shown in the illustration.

[0024] The sliding mechanism supports the lifting section 20 so that it can move vertically relative to the support column 10. The sliding mechanism can be realized, for example, by a guide rail fixed to the support column 10 and a slider fixed to the lifting section 20.

[0025] The lifting mechanism moves the lifting section 20 up and down relative to the support column 10. For example, the lifting mechanism has a straight toothed belt stretched vertically across the surface of the lifting section 20 facing the support column 10, a toothed pulley that meshes with the toothed belt on the support column 10, and a motor that drives the toothed pulley. By driving the motor, the toothed pulley is rotated in the direction that pulls up the toothed belt, thereby raising the lifting section 20, and the toothed pulley is rotated in the direction that pulls down the toothed belt, thereby lowering the lifting section 20.

[0026] Alternatively, the lifting mechanism may be implemented using a combination of a rack and spur gears instead of a toothed belt and toothed pulley. Furthermore, the sliding mechanism and lifting mechanism may be replaced with a ball-bearing linear motion mechanism or the like.

[0027] Figure 3 is a diagram showing an example of the structure of the elevator unit 4, where the upper end of the elevator unit 4 is cut in the XY plane, and the elevator unit 4 is viewed from directly above. The upper side of Figure 3 is the track side, and the lower side of Figure 3 is the platform side.

[0028] The support column 10 has a vertically elongated housing containing a drive unit 12 and a control device 17 having electrical and electronic components for driving and controlling the drive unit 12.

[0029] The drive unit 12 includes a motor and a reduction gearbox. The motor is composed of, for example, a servo motor capable of precisely controlling its rotational position / angle, and has a braking function to maintain rotation in a stopped state, and is driven and controlled by the control device 17. The reduction gearbox reduces the rotational force of the motor and rotates the output shaft. The output shaft of the reduction gearbox is supported in a direction along the Y-axis, and a drive pulley 31 is fixed to the output shaft of the reduction gearbox. In other words, the driving force of the motor rotates the drive pulley 31 via the reduction gearbox.

[0030] Figure 4 is a cross-sectional view taken along line IV-IV in Figure 3, showing the fully closed elevator unit 4 as seen from the platform side. A drive belt 33 is placed on the drive pulley 31. The drive belt 33 is a toothed annular belt and is routed along the XZ plane so as to span the inside of the support column 10 and the inside of the lifting section 20.

[0031] Specifically, the drive belt 33 is passed clockwise from the drive pulley 31 to the upper driven pulley 41, the upper left driven pulley 42, the upper right driven pulley 43, the lower right driven pulley 44, the lower left driven pulley 45, and the lower driven pulley 46, before returning to the drive pulley 31.

[0032] The upper driven pulley 41 is supported within the support column 10 above the drive pulley 31, on an axis oriented in the Y-axis direction. The lower driven pulley 46 is supported within the support column 10 below the drive pulley 31, on an axis oriented in the Y-axis direction. It is preferable to use one of these pulleys as a tension pulley.

[0033] The upper left driven pulley 42 and the upper right driven pulley 43 are toothed small-diameter pulleys that constitute the upper driven pulleys and are supported by an axis oriented in the Y-axis direction in the upper internal space of the lifting section 20. The upper left driven pulley 42 and the upper right driven pulley 43 are positioned apart in the left-right direction (X-axis direction) of the lifting section 20.

[0034] The right lower driven pulley 44 and the left lower driven pulley 45 are toothed small-diameter pulleys that constitute the lower driven pulleys and are supported by an axis oriented in the Y-axis direction in the lower internal space of the lifting section 20. The right lower driven pulley 44 and the left lower driven pulley 45 are positioned apart in the left-right direction (X-axis direction) of the lifting section 20.

[0035] Figure 5 shows an example of the structure of the lifting mechanism 20, and is a YZ cross-sectional view of the lifting mechanism 20 in a fully closed state, viewed from the X-axis positive side. As shown in Figures 4 and 5, the lifting section 20 has a spacing adjustment mechanism 50. The spacing adjustment mechanism 50 changes the vertical spacing of the multiple barrier sections 6 in conjunction with the lifting and lowering of the lifting section 20. Specifically, the spacing adjustment mechanism 50 includes an extendable link mechanism 60, a joint fixing section 61, a joint connecting section 62, and a guide section 63.

[0036] The telescopic link mechanism 60 is an open-type link mechanism in which eight rod-shaped links 64 (64a, 64b, ...) are connected in a bent shape by joint parts 65 (65a, 65b, ...). Every N (N is an odd number; in the examples from Figures 4 to 6, it is "1") joint parts 65 have fasteners 66 (see Figure 5) that fasten the blocking parts 6, and each supports one of the blocking parts 6.

[0037] The joint fixing part 61 fixes the uppermost joint part 65 (65a) of the telescopic link mechanism part 60 at a predetermined position inside the housing of the lifting part 20.

[0038] The joint connection portion 62 connects the joint portion 65 (65j) at the lowest end of the telescopic link mechanism portion 60 to the drive belt 33.

[0039] The guide portion 63 guides the vertical movement of the joint portion 65 that supports the blocking portion 6. Specifically, the guide portion 63 has a linear guide hole 67 that opens into the housing of the lifting portion 20 along the vertical direction, and a slider portion 68 that slides along the linear guide hole 67.

[0040] As shown in Figure 5, the slider section 68 is provided to correspond to every other joint section 65 (65a, 65b, ...) out of the nine joint sections 65 (65a, 65b, ...), specifically the first joint section 65a, the third joint section 65c, the fifth joint section 65e, the seventh joint section 65g, and the ninth joint section 65j from the top. The slider section 68 is connected to the joint section 65 on the Y-axis negative side (home side) and to the fastener 66 for fixing the barrier section 6 on the Y-axis positive side (track side).

[0041] Next, we will explain the operation of the retractable platform screen door 2. When transitioning from a fully closed state (see Figures 1 and 4) to a fully open state (see Figure 2), the retractable platform gate 2 releases the brake on the motor of the drive unit 12 when the lifting mechanism 20 moves upward, causing the motor to rotate and drive the drive pulley 31 counterclockwise toward Figure 4. As a result, the drive belt 33 also begins to rotate counterclockwise toward Figure 4, and the joint connection part 62 is pulled upward and rises.

[0042] When the joint connecting portion 62 rises, the telescopic link mechanism portion 60 begins to fold from its extended state. Specifically, the lowest joint 65j connected to the joint connection 62 rises along the linear guide hole 67, causing the lowest link 64h to rise. The third joint 65g from the bottom is also guided by the linear guide hole 67, causing the link 64h to swing so that the second joint 65h from the bottom shifts in the negative X-axis direction. As the second joint 65h from the bottom shifts in the negative X-axis direction, the second link 64g from the bottom swings in the X-axis direction in conjunction with it.

[0043] Therefore, when the retractable platform gate 2 transitions from the fully closed state to the fully open state, the direction D of the swing of the link 64, as viewed from the joint portion 65 guided by the guide portion 63, can be said to be in the direction along the X axis (left-right direction).

[0044] As the rise of the joint connection 62 continues, the bending at the joint 65h by links 64h and 64g will eventually reach its limit, and the lowest link 64h will hit the third link from the bottom, 64f. When this contact occurs, the rise of the joint connection 62 will begin to push up the third link from the bottom, 64f, and the third joint 65g connected to it.

[0045] In other words, the joints begin to rise sequentially from the lowest joint 65j, and the two links 64 connected directly above the joint 65j that has started to rise oscillate upwards, folding as they rise. When they reach the limit of bending due to folding, the next joint 65 begins to rise. This "propagation of upward movement" is repeated sequentially from the bottom, causing the telescopic link mechanism 60 to contract. As the telescopic link mechanism 60 contracts, the blocking sections 6 rise sequentially from the bottom.

[0046] Then, when the retractable platform gate 2 raises the lifting section 20 to a predetermined position in the fully open state, it stops the upward movement. Simultaneously with (or around the same time as) the lifting section 20 stopping, the retractable platform gate 2 stops the motor of the drive unit 12, activates the brake, and stops the telescopic link mechanism 60. When the motor of the drive unit 12 stops, the telescopic link mechanism 60 becomes most retracted at the top of the lifting section 20, as shown in Figure 6.

[0047] Specifically, the rotational length of the drive belt 33 required for the telescopic link mechanism 60 to be in its most contracted state as shown in Figure 6, and the required rotation angle of the motor to achieve that rotational length are determined in advance. Then, when the rotation angle of the motor from the start of counterclockwise rotation reaches this required rotation angle, the motor is stopped.

[0048] To transition from the fully open state (see Figures 2 and 6) to the fully closed state (see Figures 1 and 4), the retractable platform screen door 2 releases the brake on the motor of the drive unit 12 when the lifting mechanism lowers the lifting section 20, thereby rotating the motor and driving the drive pulley 31 clockwise toward Figure 6. As a result, the drive belt 33 also begins to rotate clockwise, and the joint connecting section 62 descends while being guided by the straight guide hole 67.

[0049] The links 64 and joints 65 of the telescopic link mechanism 60 return to the state shown in Figure 4, in the opposite direction to the movement from the fully closed state to the fully open state. Specifically, when the lowest joint 65j begins to descend, the weight of the entire telescopic link mechanism 60, to which the uppermost joint 65a is fixed to the joint fixing part 61, causes the connected uppermost link 64a and the link 64b directly below it to begin to extend. When the limit of extension is reached, the link 64 below it extends, and this "propagation of descent" is repeated from top to bottom, causing the telescopic link mechanism 60 to extend. In other words, each link 64 of the telescopic link mechanism 60 changes from a horizontal state along the X-axis shown in Figure 6 to an upright state along the Y-axis shown in Figure 4. Therefore, the direction D of the swing of the link 64, viewed from the joint 65 guided by the guide part 63 as the starting point when the retractable platform screen door 2 transitions from the fully open state to the fully closed state, can also be said to be in the direction along the X-axis (left-right direction).

[0050] As described above, the retractable platform screen door 2 of this embodiment employs a telescopic link mechanism 60 in which links 64 are linearly connected, and can be extended and retracted simply by raising and lowering the joint 65j at the lowest end with a drive belt 33. Therefore, even if the number of barrier sections 6 is increased, only the links 64 and joint sections 65 are increased, and the width of the retractable section 20 in the X-axis direction does not increase, thus preventing the retractable section 20 from becoming larger.

[0051] Furthermore, when the lifting section 20 is raised, the size of the folded link 64 that occupies within the lifting section 20 (especially the width in the X-axis direction) can be kept small. This helps to suppress the need to enlarge the lifting section 20.

[0052] Therefore, when the opening of the retractable platform gate 2 is fully open, it becomes easier for the conductor to check whether there are passengers getting on or off near the platform gate.

[0053] Furthermore, in the retractable platform gate 2, the upper fold of the drive belt 33 within the lifting section 20 is achieved by an upper driven pulley consisting of two pulleys, the upper left driven pulley 42 and the upper right driven pulley 43, while the lower fold of the drive belt 33 within the lifting section 20 is achieved by a lower driven pulley consisting of two pulleys, the lower right driven pulley 44 and the lower left driven pulley 45. This allows for more flexible setting of the X-axis spacing for the folds compared to using only a single driven pulley to fold the drive belt 33. In addition, the position of the lowest barrier section 6 can be made lower, thus reducing the gap between the platform 3 and the lowest barrier section 6. This structure makes it possible to prevent children from passing through, makes it easier for the blind to recognize, allows for smoother rope lifting and lowering, and improves visibility for train conductors.

[0054] Furthermore, the vertical spacing between multiple barrier sections 6 can be expanded or contracted using a telescopic link mechanism that connects the links linearly. Due to its simple structure, it is lightweight yet highly reliable. Since the telescopic link mechanism connects all the barrier sections 6, it is difficult to move only some of the barrier sections 6, and it is difficult to pass through the retractable platform fence 2 by moving some of the barrier sections 6 when it is fully closed. In other words, it is highly safe as a protective barrier.

[0055] [Variation] Furthermore, the applicable embodiments of the present invention are not limited to those described above, and components can be added, omitted, or modified as appropriate.

[0056] In the above embodiment, the spacing adjustment mechanism 50 is shown as having a configuration in which each of the blocking sections 6 is supported by a joint section 65 every N (N=1) units, and the joint sections 65 every M (M=1) units are guided vertically by a guide section 63. However, the setting of the N and M values ​​is not limited to this. However, odd numbers are preferred for the N and M values.

[0057] For example, based on the above embodiment shown with reference to Figure 5, the fasteners 66 may be omitted from the joints 65c and 65g. That is, the spacing adjustment mechanism 50 may be configured such that each of the interlocking sections 6 is supported by N (N=3) joints 65, and the guide section 63 guides the vertical movement of the M (M=1) joints 65.

[0058] Alternatively, for example, the retractable platform screen door 2B shown in Figures 7 and 8 can also be used. Figure 7 is an XZ cross-sectional view (corresponding to the IV-IV cross-sectional view in Figure 3) showing an example of a modified configuration of the retractable platform screen door 2B. Figure 8 is a YZ cross-sectional view showing an example of a modified configuration of the retractable platform screen door 2B. The spacing adjustment mechanism 50B of the retractable platform screen door 2B uses 16 links 64 to support one barrier section 6 at each joint section 65 every N (N=3) of links 64, and a guide section 63 guides the vertical movement of the joint sections 65 every M (M=3) of links 65. Increasing the number of links 64 shortens the links 64, reducing the size of the telescopic link mechanism 60B in the X-axis direction when fully open, and further reducing the size of the retractable section 20 in the X-axis direction.

[0059] Alternatively, for example, a configuration may be used that mixes various odd N values ​​and odd M values, such as the spacing adjustment mechanism 50C of the retractable platform screen door 2C shown in Figure 9.

[0060] Furthermore, the number of links 64 and joints 65 in the telescopic link mechanism 60 is not limited to the number in the above embodiment and modified examples, but can be set as appropriate, and the N value and M value may be larger than the values ​​shown in the above embodiment and modified examples depending on the number. [Explanation of symbols]

[0061] 2… Retractable platform screen doors 4… Lifting unit 6... Blocking section 10…post 12…Drive unit 17...Control device 20... Lifting section 31… Drive pulley 33… Drive belt 41… Upward-driven pulley 42... Upper left driven pulley 43... Upper right driven pulley 44... Lower right driven pulley 45...Left lower driven pulley 46... Downward-driven pulley 50...Space adjustment mechanism section 60... Telescopic link mechanism 61... Joint fixing part 62... Joint connection part 63… Guide Section 64... Link 65... Joint part 66...Binding tool 67…Straight guide hole 68...Slider section D...Link oscillation direction

Claims

1. A support column having a drive unit and a drive pulley rotated by the drive unit, A lifting mechanism having an upper driven pulley and a lower driven pulley, and supporting multiple blocking parts, The drive belt stretched between the drive pulley, the upper driven pulley, and the lower driven pulley, A lifting type platform fence comprising the following, wherein the drive belt is driven by the rotation of the drive pulley, and the lifting part moves up and down relative to the support column, thereby raising and lowering the plurality of barrier parts, The aforementioned lifting mechanism is A spacing adjustment mechanism that changes the vertical spacing between the multiple blocking sections in conjunction with the raising and lowering of the lifting section. It has, The aforementioned interval adjustment mechanism is A telescopic link mechanism comprising multiple links connected linearly, wherein every N (where N is an odd number) joints each support one of the aforementioned blocking sections, A joint fixing part that fixes the uppermost joint of the telescopic link mechanism at a predetermined position within the lifting section, A joint connecting portion that connects the joint portion at the lowest end of the telescopic link mechanism to the drive belt, A guide section that guides the vertical movement of joint sections every M (where M is an odd number), It has, The aforementioned guide portion is Guide holes provided in the lifting section along the vertical direction, A slider portion that slides along the guide hole, comprising a plurality of slider portions to which the M-unit joint portions are rotatably connected, Having, Platform safety barriers that can be raised or lowered.

2. The upper driven pulley has a plurality of pulleys arranged apart in the direction of link oscillation of the telescopic link mechanism, The lower driven pulley has a plurality of pulleys arranged apart in the direction of link oscillation of the telescopic link mechanism. The retractable platform safety barrier according to claim 1.

3. The drive belt is an annular belt wrapped around the drive pulley, the upper driven pulley, and the lower driven pulley. The retractable platform safety barrier according to claim 1 or 2.

4. N is 1, M is 1. A retractable platform safety barrier according to any one of claims 1 to 3.

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