JP2017007591A - Safety fence for platform - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a safety fence for a platform that can securely maintain a state in which first and second gate bars at closing positions close a passage.SOLUTION: A safety fence 1 for a platform comprises: a first gatepost 31 and a second gatepost 32 which face each other across a passage 5 and extend upward from the platform 7; first gate bars 11, 12 supported by the first gatepost 31 to swing; and second gate bars 21, 22 supported by the second gatepost 32 to swing. The first and second gate bars 11, 12 and 21, 22 can swing between closing positions where the gate bars extend toward each other to close the passage 5, and opening positions where the gate bars extend upward respectively to open the passage 5. Between the first gate bars 11, 12 and second gate bars 21, 22, coupling means 50 is provided which couples first tip parts 11A, 12A and second tip parts 21A, 22A with the first and second gate bars 11, 12 and 21, 22 at the closing positions.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a platform safety fence.

  Patent Document 1 discloses a conventional platform safety fence. This platform safety fence is provided on a platform provided along a track on which the track vehicle travels. A passage for getting on and off the track vehicle is set in the platform. This platform safety fence can be opened and closed.

  More specifically, the platform safety fence includes first and second gate pillars, a first gate bar, and a second gate bar. The first gate pillar and the second gate pillar face each other across the passage, and extend upward from the platform. The first gate bar is swingably supported by the first gate pillar. The second gate bar is swingably supported by the second gate pole. The first gate bar and the second gate bar can swing between a closed position and an open position. When the first gate bar and the second gate bar swing to the closed position, they extend so as to approach each other and close the passage. On the other hand, if the first gate bar and the second gate bar swing to the open position, they extend upward to open the passage.

JP 2003-118567 A

  By the way, in the conventional platform safety fence, the first and second gate bars extend in a cantilever shape in the closed position, and the first tip of the first gate bar and the second tip of the second gate bar are connected to each other. Opposite. Therefore, in this state, for example, when the first and second gate bars are pushed by a person or the like and a load is applied to the first and second gate bars, the first tip portion and the second tip portion are displaced, and a person can pass. There is a risk of creating a gap. As a result, in this platform safety fence, the first and second gate bars in the closed position may not be able to maintain the state of closing the passage.

  The present invention has been made in view of the above-described conventional situation, and should solve the problem that the first and second gate bars in the closed position can reliably maintain the state in which the passage is closed. It is an issue.

The platform safety fence according to the present invention is provided on a platform that is provided alongside a track on which a track vehicle travels and is provided with a passage for getting on and off the track vehicle. The platform safety fence is capable of opening and closing the passage. A fence,
First and second gate pillars that face each other across the passage and extend upward from the platform,
A first gate bar supported swingably on the first gate post;
A second gate bar supported swingably on the second gate post;
The first gate bar and the second gate bar are swingable between a closed position that extends close to each other and closes the passage, and an open position that extends upward and opens the passage,
Between the first gate bar and the second gate bar, with the first gate bar and the second gate bar in the closed position, the first tip of the first gate bar and the second gate bar (2) A coupling means for coupling the tip portion is provided.

  In the platform safety fence of the present invention, the first and second tip portions of the first and second gate bars extending in a cantilever shape in the closed position are coupled by the coupling means. Thereby, even if a load is applied to the first and second gate bars, the first tip portion and the second tip portion are not easily displaced, and a gap through which a person can pass is not easily generated.

  Therefore, in the platform safety fence of the present invention, the state in which the first and second gate bars in the closed position close the passage can be reliably maintained.

  The coupling means includes a wire having one end locked to the first gate bar, the other end locked to the second gate bar, and an intermediate portion stretched between the first tip and the second tip. Provided on at least one of the first gate bar and the second gate bar, following the swing of the first gate bar and the second gate bar, the intermediate portion is stretched between the first tip portion and the second tip portion without slack. Thus, it is desirable to have a length adjusting mechanism for winding and drawing out the wire.

  In this case, the first tip portion and the second tip portion of the first and second gate bars in the closed position are joined by the wire and the length adjusting mechanism constituting the joining means. Accordingly, even when a load is applied to the first and second gate bars, the first tip portion of the first gate bar and the second tip portion of the second gate bar are not easily displaced, and a gap through which a person can pass is difficult to occur.

  The length adjusting mechanism preferably includes a retightening mechanism that increases a tension acting on the wire in a state where the first gate bar and the second gate bar are in the closed position.

  In this case, the first tip portion and the second tip portion of the first and second gate bars in the closed position are more reliably coupled by the wire tightened by the tightening mechanism.

  The first gate bar includes a first upper bar supported by the first gate pillar so as to be swingable about a first upper axis extending substantially parallel to the passage direction of the passage, and a first upper side below the first upper axis. It is desirable to have a first lower bar supported by the first gate pole so as to be swingable around a first lower axis extending substantially parallel to the axis. The second gate bar includes a second upper bar supported by the second gate pole so as to be swingable around a second upper axis extending substantially parallel to the passage direction, and a second upper axis below the second upper axis. And a second lower bar supported by the second gate pole so as to be swingable about a second lower axis extending substantially in parallel with the second lower axis. The coupling means is preferably provided in each of the first upper bar and second upper bar group and the first lower bar and second lower bar group. The distance between the first lower axis and the second lower axis is preferably set longer than the distance between the first upper axis and the second upper axis. Then, in a state where the first upper bar and the second upper bar are in the closed position, the first upper bar extends from the first upper axis toward the second portal, and the second upper bar is the second upper axis. It is desirable that the first upper end portion of the first upper bar and the second upper end portion of the second upper bar are opposed to each other. Further, in a state where the first lower bar and the second lower bar are in the closed position, the first lower bar extends downward from the first lower axis and then bends toward the second portal, 2 The lower bar extends downward from the second lower axis and then bends toward the first gate post, and the first lower tip of the first lower bar and the second lower bar of the second lower bar It is desirable that the side tip is opposed.

  According to this configuration, in the state where the first and second upper bars and the first and second lower bars are in the closed position, the vertical distance between the first and second upper tips and the first and second lower tips. Is larger than the vertical distance between the first and second upper axis and the first and second lower axis. Thereby, the 1st, 2nd upper bar and the 1st, 2nd lower bar can close a passage corresponding to from an adult to a child.

  On the other hand, with the first and second upper bars and the first and second lower bars in the open position, the vertical distance between the first and second upper tips and the first and second lower tips is This is close to the vertical distance between the first and second upper shaft centers and the first and second lower shaft centers. Therefore, the height difference between the intermediate portion of the wire stretched between the first and second upper end portions and the intermediate portion of the wire stretched between the first and second lower end portions is reduced. it can. As a result, the intermediate portion of the wire stretched between the first and second lower end portions is unlikely to contact a person's head or the like passing through the passage, and is unlikely to hinder human traffic.

  When the first lower bar and the second lower bar swing near the closed position, one of the first lower bar and the second lower bar is more than the other of the first lower bar and the second lower bar. It is also desirable to first swing.

  For example, if the distance between the first lower tip and the second lower tip is narrowed with the first and second lower bars in the closed position, the first and second lower bars are close to the closed position. When simultaneously swinging, the first lower tip and the second lower tip tend to interfere with each other. In this regard, by providing a time difference as described above, interference between the first lower tip portion and the second lower tip portion can be suppressed. As a result, in this platform safety fence, the gap between the first lower end portion and the second lower end portion can be narrowed, so that a gap through which a person can pass is further less likely to occur.

  Preferably, the coupling means includes a striker provided at one of the first tip portion and the second tip portion, and a latch mechanism provided at the other of the first tip portion and the second tip portion. The latch mechanism is in a latched state where the striker is locked while the first gate bar and the second gate bar are in the closed position, while when the first gate bar and the second gate bar swing from the closed position, It is desirable to be in an unlatched state where the striker is not locked.

  In this case, the first tip portion and the second tip portion of the first and second gate bars in the closed position are joined by the striker and the latch mechanism constituting the joining means. Accordingly, even when a load is applied to the first and second gate bars, the first tip portion of the first gate bar and the second tip portion of the second gate bar are not easily displaced, and a gap through which a person can pass is difficult to occur.

  According to the platform safety fence of the present invention, the state in which the first and second gate bars in the closed position close the passage can be reliably maintained.

FIG. 1 is a schematic front view of a platform to which the platform safety fence of the first embodiment is applied. FIG. 2 is a schematic front view of the platform safety fence according to the first embodiment. FIG. 3 is a schematic top view of the platform safety fence according to the first embodiment. FIG. 4 is a perspective view of the length adjusting mechanism. FIG. 5 is a perspective view of the length adjusting mechanism. FIG. 6 is an exploded perspective view of the length adjusting mechanism. FIG. 7 is a schematic front view of the platform safety fence according to the first embodiment. FIG. 8 is a schematic diagram for explaining the operation of the length adjusting mechanism. FIG. 9 is a schematic front view of the platform safety fence according to the second embodiment. FIG. 10 is a schematic front view of the platform safety fence according to the third embodiment. FIG. 11 is an exploded perspective view of the striker and latch mechanism. FIG. 12 is a schematic diagram for explaining the operation of the latch mechanism. FIG. 13 is a partial schematic top view of the platform safety fence according to the fourth embodiment. FIG. 14A is a partial schematic side view of the platform safety fence according to the fifth embodiment, and FIG. 14B is a partial schematic top view of the platform safety fence according to the fifth embodiment. FIG. 15 is a perspective view of the length adjusting mechanism according to the platform safety fence of the sixth embodiment. FIG. 16 is an exploded perspective view of the length adjusting mechanism according to the platform safety fence of the sixth embodiment. FIG. 17 relates to the platform safety fence according to the sixth embodiment, where (a) is a side view of the length adjusting mechanism, and (b) is a schematic side view of the length adjusting mechanism. FIG. 18 relates to the platform safety fence of the sixth embodiment, and (a) and (b) are side views of the length adjusting mechanism. FIG. 19 is a partial schematic view mainly showing a key cylinder according to the platform safety fence of the seventh embodiment. FIG. 20 is a schematic partial side view of the length adjusting mechanism according to the platform safety fence of the seventh embodiment. FIG. 21 is a schematic partial side view of the length adjusting mechanism according to the platform safety fence of the seventh embodiment. FIG. 22 is a partial schematic view mainly showing a key cylinder according to the platform safety fence of the eighth embodiment. FIG. 23 is a schematic diagram for explaining the operation of the latch mechanism according to the platform safety fence of the eighth embodiment.

  Hereinafter, Embodiments 1 to 8 embodying the present invention will be described with reference to the drawings.

Example 1
As shown in FIGS. 1 to 3, a platform safety fence (hereinafter referred to as a safety fence) 1 according to the first embodiment is an example of a specific aspect of the platform safety fence of the present invention. The safety fence 1 is provided on the platform 7. The platform 7 is provided side by side on the track 3 on which the track vehicle 9 such as a railcar or a monorail travels. A passage 5 for getting on and off the rail vehicle 9 is set in the platform 7. The passages 5 are set at a plurality of locations on the platform 7 corresponding to a plurality of entrances / exits provided in the track vehicle 9.

  As shown in FIG. 1, a plurality of safety fences 1 are installed on the platform 7 so that the corresponding passages 5 can be opened and closed. A fixed fence 2 is disposed between the safety fences 1. The fixed fence 2 restricts a person or the like from approaching the track 3 from a place other than the passage 5 in the platform 7.

  In this embodiment, the upper side in FIG. 1 is the upper side, and the lower side is the lower side. A direction perpendicular to the plane of FIG. 1, which is a direction in which a person getting on and off the track vehicle 9 passes through the passage 5, is defined as the front-rear direction. 1 on the basis of a person getting on the track vehicle 9, the front side in FIG. 1 as the front side of the person is the front side, the front side in FIG. 1 behind the person is the back side, and the left hand side of the person 1 is defined as the left side, and the right side of FIG. 1 as the right hand side of the person is defined as the right side. And the up-down direction, the front-rear direction, and the left-right direction shown in the drawings after FIG. 2 all correspond to FIG.

  As shown in FIGS. 1 to 3, the safety fence 1 includes a first gate pillar 31 located on the left side of the passage 5 and a second gate pillar 32 located on the right side of the passage 5. . The first gate pillar 31 and the second gate pillar 32 face each other with the passage 5 sandwiched from the left and right directions. The first gate pillar 31 and the second gate pillar 32 are substantially rectangular pillars each having a hollow portion formed therein, and extend upward from the platform 7 respectively.

  As shown in FIGS. 1 to 3 and 7, the safety fence 1 includes a set of the first upper bar 11 and the second upper bar 21, and a set of the first lower bar 12 and the second lower bar 22. I have.

The first upper bar 11 and the first lower bar 12 are examples of the “first gate bar” in the present invention.
The first upper tip 11A of the first upper bar 11 and the first lower tip 12A of the first lower bar 12 are examples of the “first tip” of the present invention.

The second upper bar 21 and the second lower bar 22 are examples of the “second gate bar” in the present invention.
The second upper end portion 21A of the second upper bar 21 and the second lower end portion 22A of the second lower bar 22 are examples of the “second end portion” of the present invention.

  The first upper bar 11, the first lower bar 12, the second upper bar 21, and the second lower bar 22 are made of a metal such as aluminum or iron, a resin, FRP, or the like, and have a long columnar shape or a cylindrical shape. Is the body.

  As shown in FIGS. 2 and 7, the first upper bar 11 is supported by the upper end portion of the first portal 31 so as to be swingable around the first upper axis X <b> 11 extending in the front-rear direction. A first upper gear 11 </ b> G is assembled to the base end portion of the first upper bar 11. The first upper gear 11G swings around the first upper axis X11 integrally with the first upper bar 11.

  The first lower bar 12 is supported by an intermediate portion of the first gate column 31 so as to be swingable around the first lower axis X12 extending in the front-rear direction below the first upper axis X11. A first lower gear 12 </ b> G is assembled to the base end portion of the first lower bar 12. The first lower gear 12G swings around the first lower axis X12 integrally with the first lower bar 12.

  The second upper bar 21 is supported by the upper end portion of the second gate pillar 32 so as to be swingable around the second upper axis X21 extending in the front-rear direction. A second upper gear 21 </ b> G is assembled to the base end portion of the second upper bar 21. The second upper gear 21G swings around the second upper axis X21 integrally with the second upper bar 21.

  The second lower bar 22 is supported by an intermediate portion of the second gate pillar 32 so as to be swingable around the second lower axis X22 extending in the front-rear direction below the second upper axis X21. A second lower gear 22 </ b> G is assembled to the base end portion of the second lower bar 22. The second lower gear 22G swings around the second lower axis X22 integrally with the second lower bar 22.

  As shown in FIG. 2, the vertical distance between the first upper axis X11 and the first lower axis X12 is H1. The distance in the vertical direction between the second upper axis X21 and the second lower axis X22 is also H1. The distance between the first upper axis X11 and the second upper axis X21 is L1. The distance between the first lower axis X12 and the second lower axis X22 is L2. The distance L2 is set longer than the distance L1.

  As shown in FIGS. 2 and 7, a first drive gear 13 </ b> G and a first tension coil spring 14 are accommodated in the first gate pole 31.

  The first drive gear 13G is supported by the first portal 31 so as to be rotatable around a first drive axis X13 extending in the front-rear direction. The first drive gear 13G meshes with the first upper gear 11G and the first lower gear 12G. The first driving gear 13G is formed with a protruding portion 13T that protrudes in the radially outward direction of the first driving axis X13. The first drive gear 13G rotates counterclockwise toward the paper surface of FIGS. 2 and 7 by being driven by a motor (not shown).

  The upper end portion of the first tension coil spring 14 is locked to the protruding portion 13T. The lower end portion of the first tension coil spring 14 is locked to the lower end portion of the first gate pole 31. The first tension coil spring 14 urges the first drive gear 13G to rotate clockwise toward the plane of FIG. 2 and FIG.

  A second drive gear 23G and a second tension coil spring 24 are accommodated in the second gate pillar 32.

  The second drive gear 23G is supported by the second gate pillar 32 so as to be rotatable around a second drive axis X23 extending in the front-rear direction. The second drive gear 23G meshes with the second upper gear 21G and the second lower gear 22G. The second drive gear 23G is formed with a projecting portion 23T that projects in the radially outward direction of the second drive shaft center X23. The second drive gear 23G is driven by a motor (not shown) to rotate clockwise toward the plane of FIG. 2 and FIG.

  The upper end portion of the second tension coil spring 24 is locked to the protruding portion 23T. The lower end portion of the second tension coil spring 24 is locked to the lower end portion of the second gate pole 32. The second tension coil spring 24 urges the second drive gear 23G to rotate counterclockwise toward the plane of FIG. 2 and FIG.

  The set of the first upper bar 11 and the second upper bar 21 and the set of the first lower bar 12 and the second lower bar 22 are as follows in the closed position shown in FIG. Swing between the open position shown.

  That is, when the motor that drives the first drive gear 13G and the motor that drives the second drive gear 23G are controlled by a control unit (not shown) to rotate synchronously, the first drive gear 13G is biased by the first tension coil spring 14. 2 and FIG. 7 while rotating counterclockwise, the second drive gear 23G resists the urging force of the second tension coil spring 24 and moves toward the paper surface of FIG. 2 and FIG. Rotate in the direction.

  Therefore, the first upper gear 11G meshing with the first drive gear 13G rotates the first upper bar 11 around the first upper axis X11 in the clockwise direction toward the plane of FIG. 2 and FIG. Further, the second upper gear 21G meshing with the second drive gear 23G causes the second upper bar 21 to rotate counterclockwise around the second upper axis X21 toward the plane of FIG. 2 and FIG. As a result, the set of the first upper bar 11 and the second upper bar 21 swings to the closed position shown in FIG.

  Further, the first lower gear 12G meshing with the first drive gear 13G rotates the first lower bar 12 around the first lower axis X12 in the clockwise direction toward the plane of FIG. 2 and FIG. Further, the second lower gear 22G meshing with the second drive gear 23G causes the second lower bar 22 to rotate counterclockwise around the second lower axis X22 toward the plane of FIG. 2 and FIG. As a result, the set of the first lower bar 12 and the second lower bar 22 also swings to the closed position shown in FIG.

  With the set of the first upper bar 11 and the second upper bar 21 in the closed position shown in FIG. 2, the first upper bar 11 extends substantially horizontally from the first upper axis X11 toward the second gate column 32. The second upper bar 21 extends substantially horizontally from the second upper axis X21 toward the first gate column 31, and includes a first upper end portion 11A of the first upper bar 11 and a second upper side of the second upper bar 21. The tip 21A is opposed.

  In addition, after the first lower bar 12 and the second lower bar 22 are in the closed position shown in FIG. 2, the first lower bar 12 extends downward from the first lower axis X12. The second lower bar 22 is bent toward the second gate pillar 32 and extends substantially horizontally. The second lower bar 22 extends downward from the second lower axis X22 and then is bent toward the first gate pole 31 and extends substantially horizontally. The first lower end portion 12A of the first lower bar 12 and the second lower end portion 22A of the second lower bar 22 are opposed to each other. The distance W1 between the first lower tip 12A and the second lower tip 22A in the closed position shown in FIG. 2 is such that the first lower bar 12 and the second lower bar 22 are close to the closed position shown in FIG. Are set so as not to interfere with each other when simultaneously swinging.

  Thus, the pair of the first upper bar 11 and the second upper bar 21 and the pair of the first lower bar 12 and the second lower bar 22 are in the closed position shown in FIG. To do. Here, the vertical distance between the first and second upper tips 11A and 21A and the first and second lower tips 12A and 22A in the closed position shown in FIG. The interval H2 is larger than the interval H1.

  On the other hand, when the motor that drives the first drive gear 13G and the motor that drives the second drive gear 23G are deactivated by a control unit (not shown), the first drive gear 13G The second drive gear 23G rotates counterclockwise toward the paper surface of FIGS. 2 and 7 by the biasing force of the second tension coil spring 24 by the biasing force. .

  Therefore, the first upper gear 11G meshing with the first drive gear 13G rotates the first upper bar 11 around the first upper axis X11 in the counterclockwise direction toward the plane of FIG. 2 and FIG. Further, the second upper gear 21G meshing with the second drive gear 23G rotates the second upper bar 21 around the second upper axis X21 in the clockwise direction toward the plane of FIG. 2 and FIG. As a result, the set of the first upper bar 11 and the second upper bar 21 swings to the open position shown in FIG.

  Further, the first lower gear 12G meshing with the first drive gear 13G rotates the first lower bar 12 around the first lower axis X12 in the counterclockwise direction toward the plane of FIG. 2 and FIG. Further, the second lower gear 22G meshing with the second drive gear 23G causes the second lower bar 22 to rotate clockwise around the second lower axis X22 toward the plane of FIG. 2 and FIG. As a result, the set of the first lower bar 12 and the second lower bar 22 also swings to the open position shown in FIG.

  In a state where the set of the first upper bar 11 and the second upper bar 21 is in the open position shown in FIG. 7, the first upper bar 11 extends substantially vertically upward from the first upper axis X11, and the second upper bar 21 extends substantially vertically upward from the second upper axis X21.

  In addition, after the first lower bar 12 and the second lower bar 22 are in the open position shown in FIG. 7, the first lower bar 12 extends rightward from the first lower axis X12. Bending upward and extending substantially vertically while adjoining the first upper bar 11, the second lower bar 22 extends leftward from the second lower axis X22 and then bends upward to form the second upper bar 21. It extends substantially vertically while adjoining.

  Thus, the first upper bar 11 and the second upper bar 21 and the first lower bar 12 and the second lower bar 22 are in the open position shown in FIG. To do. Here, the vertical interval between the first and second upper tips 11A, 21A and the first and second lower tips 12A, 22A in the open position shown in FIG. 7 is defined as H3. The interval H3 is smaller than the interval H2 and close to the interval H1. In the present embodiment, as shown in FIG. 7, the interval H3 is smaller than the interval H1.

  As shown in FIGS. 2 to 8, in this safety fence 1, a coupling means 50 is provided between the first upper bar 11 and the second upper bar 21, and the first lower bar 12 and the second lower bar 21. A connecting means 50 is also provided between the side bars 22.

  As shown in FIGS. 4 to 6 and 8, the upper coupling means 50 and the lower coupling means 50 have the same configuration, and include a wire 90 and a length adjusting mechanism 60. The length adjusting mechanism 60 includes a retightening mechanism 80.

  The wire 90 is a flexible wire formed by knitting or twisting metal wires, chemical fibers, or the like. In this embodiment, as the wire 90, a wire that has low elongation, high breaking strength, and excellent durability is employed.

  As shown in FIGS. 2 and 7, in the upper coupling means 50, one end portion 90 </ b> A of the wire 90 is locked to a fixed pulley 11 </ b> P provided at the first upper end portion 11 </ b> A of the first upper bar 11. . The other end 90 </ b> B of the wire 90 is locked to the length adjustment mechanism 60 accommodated in the second upper bar 21. The intermediate portion 90C of the wire 90 is hung on the movable pulley 21P provided at the second upper end portion 21A of the second upper bar 21, and the second upper end portion 11A of the first upper bar 11 and the second upper end portion 11A. It is stretched between the second upper end portion 21A of the upper bar 21.

  In the lower coupling means 50, one end portion 90 </ b> A of the wire 90 is locked to a fixed pulley 12 </ b> P provided at the first lower end portion 12 </ b> A of the first lower bar 12. The other end 90 </ b> B of the wire 90 is locked to the length adjustment mechanism 60 accommodated in the second lower bar 22. The intermediate portion 90C of the wire 90 is hung on the movable pulley 22P provided at the second lower end portion 22A of the second lower bar 22, and the first lower end portion 12A of the first lower bar 12 is hooked. And the second lower end portion 22A of the second lower bar 22.

  Next, a specific configuration of the length adjusting mechanism 60 will be described with reference to FIGS. 4 to 6 and FIG. In the following description, the length of the first upper bar 11 and the second upper bar 21 and the first lower bar 12 and the second lower bar 22 in the closed position shown in FIG. The shape and relative positional relationship of each member constituting the length adjustment mechanism 60 will be described with reference to the posture of the length adjustment mechanism 60.

  As shown in FIGS. 4 to 6, the length adjusting mechanism 60 includes a fixed plate 61, a movable plate 62, a wire winding drum 81, a ratchet 63, and a motor 85. The movable plate 62 and the motor 85 also serve as the retightening mechanism 80.

  As shown in FIG. 6, the fixed plate 61 is made of a substantially rectangular plate material. A recessed portion 61 </ b> A that is recessed forward is formed in a portion on the right side of the center portion of the fixed plate 61. A cam hole 61 </ b> F through which a cam 88 described later is inserted is provided in the upper part of the central portion of the recess 61 </ b> A. A through hole 61G is provided on the left side, the right side, and the lower side of the cam hole 61F. At the center of the lower end edge of the fixed plate 61, a notch 61H that is recessed upward in a substantially rectangular shape is formed.

  In the four corners of the fixed plate 61, through holes 61B are provided. The fixing plate 61 is connected to a connecting portion (not shown) in which the rear end portions of the four connecting members 71 are connected to the through holes 61 </ b> B, and the front end portions of the connecting members 71 are provided inside the second upper bar 21. By being connected, the second upper bar 21 is assembled.

  A long hole 61 </ b> E that is long in the left-right direction is provided on the left side of the recess 61 </ b> A in the fixed plate 61. A through hole 61C is provided between the lower left through hole 61B and the notch 61H on the lower end edge side of the fixed plate 61. A through hole 61D is provided between the recess 61A on the upper edge side of the fixed plate 61 and the upper right through hole 61B.

  The movable plate 62 is made of a substantially rectangular plate material whose length in the left-right direction is shorter than that of the fixed plate 61. The movable plate 62 is disposed on the rear side with respect to the fixed plate 61. Long holes 62 </ b> A and 62 </ b> B that extend in the left-right direction are respectively provided through the lower left corner and the upper right corner of the movable plate 62. An elongated hole 62 </ b> C that is long in the vertical direction is provided through the upper edge of the central portion of the movable plate 62. A through hole 62 </ b> D and a spring insertion hole 62 </ b> E are provided through the lower end edge side of the central portion of the movable plate 62. A through hole 62 </ b> F is provided in a portion on the left side of the central portion of the movable plate 62.

  The movable plate 62 is connected to the fixed plate 61 by two guide shafts 72. The front end portion of the multi-stage cylindrical guide shaft 72 is inserted into the through hole 61C and the through hole 61D of the fixed plate 61, respectively, and is fixed by caulking. The rear end portions of the guide shaft 72 are inserted into the long holes 62A and 62B of the movable plate 62, respectively. Caps 72C for restricting the guide shafts 72 from being removed from the long holes 62A and 62B are caulked and fixed to the rear end portions of the guide shafts 72, respectively. Each guide shaft 72 is slidable in the left-right direction within the elongated holes 62A and 62B. Thereby, as shown in FIGS. 8A to 8C, the movable plate 62 can be displaced relative to the fixed plate 61 in the left-right direction.

  As shown in FIG. 6, the wire take-up drum 81 is a combination of a main body portion 82, a spring spring 83, and a spring holding portion 84.

  The main body portion 82 has a substantially cylindrical shape with the front end portion closed with the winding axis X81 extending in the front-rear direction as the central axis. The main body part 82 is formed with a first protrusion 82A and external teeth 82B. The first protruding portion 82A protrudes rearward from the front end portion of the main body portion 82 in a cylindrical shape with the winding axis X81 as the central axis. The external teeth 82 </ b> B are formed on the outer peripheral surface of the rear end portion of the main body portion 82. The outer peripheral surface of the main body portion 82 is recessed between the front end portion and the rear end portion, and the wire 90 is wound after the other end portion 90B of the wire 90 is locked to the recessed portion.

  The spring holding portion 84 has a substantially cylindrical shape with the take-up axis X81 as the central axis and the rear end portion closed. The spring holding portion 84 is formed with a second protruding portion 84A. The second protruding portion 84A protrudes rearward from the rear end portion of the spring holding portion 84 in a flat cylindrical shape having the winding axis X81 as the central axis. The spring holding portion 84 has an outer diameter smaller than the inner diameter of the main body portion 82 and is accommodated in the main body portion 82.

  The spring spring 83 is formed by spirally winding a leaf spring and is accommodated in the spring holding portion 84. One end of the spring spring 83 is locked to the first projecting portion 82 </ b> A of the main body portion 82. On the other hand, the other end of the spring spring 83 is locked to the inner peripheral surface of the spring holding portion 84.

  The main body part 82, the mainspring spring 83, and the spring holding part 84 are arranged on the front side of the fixed plate 61 in a combined state, and the support shaft 76 and the first holding part 82A of the main body part 82 and the spring holding part 84 from the front. The second projecting portion 84A is inserted. Then, the second projecting portion 84 </ b> A and the support shaft 76 are inserted into the long hole 61 </ b> E of the fixed plate 61. Further, the rear end portion of the support shaft 76 is inserted into the through hole 62F of the movable plate 62 and fixed by caulking. As a result, the spring holding portion 84 is fixed to the movable plate 62 so as not to rotate, and the main body portion 82 is supported by the movable plate 62 so as to be rotatable around the take-up axis X81.

  As shown in FIGS. 8A to 8C, when the movable plate 62 is displaced relative to the fixed plate 61 in the left-right direction, the wire take-up drum 81 is also displaced integrally with the movable plate 62, On the other hand, it is displaced in the left-right direction. The mainspring 83 urges the main body 82 to rotate about the winding axis X81 in the counterclockwise direction toward the plane of FIG. 8, that is, in the winding direction of the wire 90.

  As shown in FIG. 6, the ratchet 63 is a lever-shaped member in which a shaft hole 63 </ b> B having a pivot axis X <b> 63 extending in the front-rear direction as a central axis is provided. The ratchet 63 extends upward while tilting rightward from the pivot axis X63, and then bends and extends rightward. The ratchet 63 is formed with a bulging portion 63A that bulges backward while surrounding the shaft hole 63B. At the bent portion of the ratchet 63, an engaging claw 63C that can be engaged with the external teeth 82B of the main body portion 82 projects leftward. The upper surface of the portion extending rightward of the ratchet 63 is a contacted portion 63E that can be in contact with a cam projection 88C of a cam 88 described later.

  In a state where the ratchet 63 is disposed on the front side with respect to the fixed plate 61, the swing shaft 74 is inserted into the shaft hole 63B from the front. Then, the bulging portion 63A and the swing shaft 74 pass through the notch portion 61H of the fixed plate 61. Further, the rear end portion of the swing shaft 74 is inserted into the through hole 62D of the movable plate 62 and fixed by caulking. As a result, the ratchet 63 is supported by the movable plate 62 so as to be swingable around the swing axis X63.

  As shown in FIGS. 5 and 6, the coil portion of the torsion coil spring 75 is inserted into the front end portion of the swing shaft 74. One end of the torsion coil spring 75 is engaged with the spring insertion hole 62 </ b> E of the movable plate 62. The other end of the torsion coil spring 75 is locked to a spring engaged portion 63D shown in FIG.

  As shown in FIGS. 8A to 8C, when the movable plate 62 is relatively displaced in the left-right direction with respect to the fixed plate 61, the ratchet 63 is also displaced integrally with the movable plate 62 and left and right with respect to the fixed plate 61. Relative displacement in the direction. The torsion coil spring 75 is attached so that the ratchet 63 is engaged with the outer teeth 82B of the main body 81 in the counterclockwise direction around the swing axis X63 toward the paper surface of FIG. It is fast.

  The engaging claw 63C and the external teeth 82B are such that the main body 82 of the wire take-up drum 81 rotates counterclockwise around the take-up axis X81 toward the plane of FIG. 8, that is, in the take-up direction of the wire 90. In this case, the engaging claw 63C escapes from the external teeth 82B and allows the body 90 to wind the wire 90. Further, the engaging claw 63C and the external teeth 82B are rotated in the clockwise direction toward the paper surface of FIG. 8, that is, in the pulling-out direction of the wire 90, around the winding axis X81. In this case, the engaging claw 63C meshes with the external teeth 82B to prohibit the drawing of the wire 90 from the main body portion 82.

  As shown in FIG. 6, the motor 85 includes a gear-shaped rotating portion 89 and a cam 88 mounted on the rotating portion 89 so as to be integrally rotatable. Three screw holes 89 </ b> A are formed on the left side, the right side, and the lower side of the rotating portion 89 in the motor 85.

  With the motor 85 disposed on the front side with respect to the fixed plate 61, three set screws 78 are inserted into the respective through holes 61G of the fixed plate 61 from the rear and further screwed into the respective screw holes 89A of the motor 85. It is. As a result, the motor 85 is fixed to the fixed plate 61.

  The motor 85 operates under the control of a control unit (not shown), thereby rotating the rotating unit 89 and the cam 88 forward and backward around the cam axis X88. The cam 88 has a flat cylindrical shape with the cam shaft center X88 as the central axis, and is inserted into the cam hole 61F of the fixed plate 61.

  As shown in FIGS. 6 and 8, the cam 88 has a cam projection 88C. The cam convex portion 88C protrudes in the radially outward direction of the cam shaft center X88 from a portion of the outer peripheral surface of the cam 88 located on the front side of the fixed plate 61. As shown in FIG. 8C, the cam 88 rotates around the cam axis X88 so that the cam convex portion 88 </ b> C can come into contact with the contacted portion 63 </ b> E of the ratchet 63. When the cam projection 88C pushes down the contacted portion 63E of the ratchet 63, the ratchet 63 swings clockwise around the swing axis X63 toward the paper surface of FIG. The outer teeth 82B are separated from each other.

  As shown in FIG. 6, a cam hole 88B is recessed in the cam 88 at a position eccentric from the cam axis X88. The front end portion of the cam shaft 77 is fitted into the cam hole 88B. A rear end portion of the cam shaft 77 is inserted into the elongated hole 62 </ b> C of the movable plate 62. A cap 77C that restricts the cam shaft 77 from being detached from the elongated hole 62C is fixed by caulking to the rear end portion of the cam shaft 77. As shown in FIGS. 8A to 8C, the cam 88 rotates forward and reverse around the cam shaft center X88, so that the cam shaft 77 slides in the up-down direction within the elongated hole 62C. 62 is displaced relative to the fixed plate 61 in the left-right direction.

  When the set of the first upper bar 11 and the second upper bar 21 swings from the open position shown in FIG. 7 to the closed position shown in FIG. 2, the first upper tip 11A of the first upper bar 11 and the second upper bar 21 is approached to the second upper end portion 21A. At this time, in the upper length adjusting mechanism 60, as shown in FIG. 8A, the cam convex portion 88C does not push down the contacted portion 63E of the ratchet 63, and the cam shaft 77 moves the movable plate. 62 is relatively displaced to the left with respect to the fixed plate 61.

  In this state, the engaging claws 63 </ b> C and the external teeth 82 </ b> B allow the wire 90 to be wound by the body portion 82 of the wire winding drum 81, while prohibiting the wire 90 from being pulled out from the body portion 82. Therefore, if even a slight slack occurs in the intermediate portion 90C of the wire 90 constituting the upper coupling means 50, the main body portion 82 of the wire take-up drum 81 is urged by the mainspring spring 83 in the upper length adjusting mechanism 60. Then, the other end portion 90B of the wire 90 is immediately wound up to eliminate the slack.

  When the set of the first upper bar 11 and the second upper bar 21 reaches the closed position shown in FIG. 2, the upper length adjusting mechanism 60 causes the cam 88 shown in FIG. As shown in FIG. 8 (b), the cam shaft 77 relatively displaces the movable plate 62 to the right with respect to the fixed plate 61. For this reason, the main body part 82 from which the drawing of the wire 90 is prohibited is also displaced rightward together with the movable plate 62, and the wire 90 is pulled. As a result, the tension acting on the intermediate portion 90C of the wire 90 stretched between the first upper end portion 11A and the second upper end portion 21A increases.

  Thus, the upper coupling means 50 has the first upper end 11A of the first upper bar 11 and the second upper bar 11 in a state where the set of the first upper bar 11 and the second upper bar 21 is in the closed position shown in FIG. The second upper end portion 21A of the upper bar 21 is securely coupled.

  On the other hand, when the set of the first upper bar 11 and the second upper bar 21 swings from the closed position shown in FIG. 2 to the open position shown in FIG. 7, the upper length adjusting mechanism 60 is shown in FIG. The cam 88 shown rotates counterclockwise toward the paper surface of FIG. 8, and the cam shaft 77 relatively displaces the movable plate 62 to the left with respect to the fixed plate 61 as shown in FIG. As a result, the main body 82 is also displaced leftward together with the movable plate 62, and the retightening of the wire 90 is released. Then, the cam 88 shown in FIG. 8 (a) further rotates counterclockwise toward the paper surface of FIG. 8, and the cam convex portion 88C is brought into contact with the contact portion 63E of the ratchet 63 as shown in FIG. 8 (c). Press down.

  In this state, the engaging claws 63 </ b> C are separated from the external teeth 82 </ b> B, and the drawing of the wire 90 from the main body 82 of the wire winding drum 81 is allowed. For this reason, the upper length adjusting mechanism 60 follows the separation of the first upper end portion 11A of the first upper bar 11 and the second upper end portion 21A of the second upper bar 21, and the wire 90 The wire 90 is pulled out from the main body portion 82 so that the intermediate portion 90C is stretched between the first upper end portion 11A and the second upper end portion 21A without slack.

  Although not described, the lower length adjustment mechanism 60 operates in the same manner as the upper length adjustment mechanism 60 and follows the swing of the set of the first lower bar 12 and the second lower bar 22. Then, the wire 90 is wound and pulled out so that the intermediate portion 90C of the wire 90 is stretched between the first lower tip portion 12A and the second lower tip portion 22A without slack. The lower length adjusting mechanism 60 is configured such that the set of the first lower bar 12 and the second lower bar 22 is brought into the closed position by the movable plate 62 constituting the retightening mechanism 80 and the cam 88 of the motor 85. In a certain state, the tension acting on the intermediate portion 90C of the wire 90 stretched between the first lower tip portion 12A and the second lower tip portion 22A is increased.

  Thus, the lower coupling means 50 also has the first lower tip 12A of the first lower bar 12 and the first lower bar 12 in a state where the pair of the first lower bar 12 and the second lower bar 22 is in the closed position. 2 The second lower end 22A of the lower bar 22 is securely coupled.

<Effect>
In the safety fence 1 according to the first embodiment, the first upper end 11A of the first upper bar 11 extending in a cantilever shape with the first and second upper bars 11 and 21 in the closed position shown in FIG. The second upper end 21 </ b> A of the second upper bar 21 extending in a cantilever shape is coupled by the wire 90 and the length adjusting mechanism 60 that constitute the upper coupling means 50. Specifically, when the first and second upper bars 11 and 21 swing from the open position shown in FIG. 7 to the closed position shown in FIG. 2, the upper length adjustment mechanism 60 follows the swing. The wire 90 is wound so that the intermediate portion 90C of the wire 90 stretched between the first upper end portion 11A and the second upper end portion 21A does not loosen. Next, the upper length adjusting mechanism 60 includes the movable plate 62 constituting the tightening mechanism 80, the cam 88 of the motor 85, and the like in a state where the first and second upper bars 11 and 21 are in the closed position shown in FIG. Transition from the state shown in FIG. 8 (a) to the state shown in FIG. 8 (b), so that the intermediate portion of the wire 90 stretched between the first upper end portion 11A and the second upper end portion 21A Increase tension acting on 90C. Accordingly, the first upper end portion 11A of the first upper bar 11 and the second upper end portion 21A of the second upper bar 21 are reliably coupled. As a result, even if the first and second upper bars 11 and 21 in the closed position shown in FIG. 11A and the second upper end portion 21A are not easily displaced, and a gap through which a person can pass is less likely to occur.

  Similarly, the first lower end portion 12A of the first lower bar 12 extending in a cantilever shape with the first and second lower bars 12 and 22 in the closed position shown in FIG. The second lower end 22 </ b> A of the second lower bar 22 extending in a shape is securely coupled by the wire 90 and the length adjusting mechanism 60 constituting the lower coupling means 50. As a result, even if a load is applied to the first and second lower bars 12 and 22 in the closed position shown in FIG. 2, the first lower tip portion 12A and the second lower tip portion 22A are not easily displaced. It is difficult for a gap to pass through.

  Therefore, in the safety fence 1 according to the first embodiment, it is possible to reliably maintain the state in which the first and second upper bars 11 and 21 and the first and second lower bars 12 and 22 in the closed position close the passage 5.

  Further, in this safety fence 1, as shown in FIG. 2, the distance L2 between the first lower axis X12 and the second lower axis X22 is equal to the first upper axis X11 and the second upper axis X21. Is set longer than the distance L1. Then, in a state where the first and second upper bars 11, 21 are in the closed position shown in FIG. 2, the first upper bar 11 extends substantially horizontally from the first upper axis X11 toward the second gate pillar 32, The second upper bar 21 extends substantially horizontally from the second upper axis X21 toward the first gate column 31, and includes a first upper tip 11A of the first upper bar 11 and a second upper tip of the second upper bar 21. 21A is facing. In addition, in a state where the first and second lower bars 12 and 22 are in the closed position shown in FIG. 2, the first lower bar 12 extends downward from the first lower axis X12 to the second gate pillar 32. The second lower bar 22 extends downward from the second lower axis X22 and then bends substantially horizontally toward the first gate post 31 and extends substantially horizontally. The first lower tip 12A of the first lower bar 12 and the second lower tip 22A of the second lower bar 22 are opposed to each other.

  With this configuration, in the safety fence 1, the first and second upper ends 11 and 21 and the first and second lower bars 12 and 22 are in the closed position shown in FIG. The vertical interval H2 between the portions 11A, 21A and the first and second lower tip portions 12A, 22A is the vertical distance between the first and second upper axial centers X11, X21 and the first, second lower axial centers X12, X22. It becomes larger than the interval H1 in the direction. Thus, the first and second upper bars 11 and 21 and the first and second lower bars 12 and 22 can close the passage 5 from an adult to a child or a person on a wheelchair.

  On the other hand, the first and second upper ends 11A and 21A and the first and second upper bars 11 and 21 and the first and second upper bars 11 and 21 and the first and second lower bars 12 and 22 are in the open position shown in FIG. The vertical distance H3 between the lower tip portions 12A and 22A is close to the vertical distance H1 between the first and second upper axes X11 and X21 and the first and second lower axes X12 and X22. Therefore, the wire 90 stretched between the intermediate portion 90C of the wire 90 stretched between the first and second upper tips 11A and 21A and the first and second lower tips 12A and 22A. The height difference from the intermediate portion 90C can be reduced. As a result, the intermediate portion 90C of the wire 90 stretched between the first and second lower end portions 12A and 22A is difficult to contact the head of a person passing through the passage 5, and hinders the passage of people. hard.

(Example 2)
As shown in FIG. 9, in the safety fence of the second embodiment, the interval W2 between the first lower tip portion 12A and the second lower tip portion 22A in the closed position is the safety fence 1 of the first embodiment shown in FIG. It is made narrower than the space | interval W1 which concerns on. In this safety fence, when the first and second lower bars 12 and 22 swing in the vicinity of the closed position, the second lower bar 22 is more than the first lower bar 12 as shown by a solid line in FIG. Also rocks first. At this time, as indicated by a solid line in FIG. 9, the second upper bar 21 also swings ahead of the first upper bar 11 in synchronization with the second lower bar 22 and approaches the second lower bar 22. Don't overdo it.

  Further, in the safety fence of the second embodiment, a contact sensor 19 is provided on the upper surface of the first upper bar 11. The contact sensor 19 includes a contact portion 19A, an urging spring 19B, and a micro switch 19C. The contact portion 19 </ b> A is an elongated body that extends along the upper surface of the first upper bar 11. The contact portion 19 </ b> A is supported by the first upper bar 11 so as to be embedded in the upper surface of the first upper bar 11. The urging springs 19 </ b> B are provided at a plurality of locations in the first upper bar 11 and urged so that the contact portion 19 </ b> A protrudes from the upper surface of the first upper bar 11. The microswitch 19 </ b> C is provided at a plurality of locations in the first upper bar 11 and detects that the contact portion 19 </ b> A is buried in the upper surface of the first upper bar 11.

  The contact sensor 19 may be provided on a surface other than the upper end surface of the first upper bar 11, or on each surface of the first lower bar 12, the second upper bar 21, and the second lower bar 22. Instead of the contact sensor 19, various types of contact sensors such as a sensor that detects a contact by forming a soft tape and a part thereof is crushed may be employed.

  Other configurations of the second embodiment are the same as those of the first embodiment. For this reason, about the same structure as Example 1, the same code | symbol is attached | subjected and description is abbreviate | omitted or simplified.

  In the safety fence according to the second embodiment having such a configuration, if the first and second lower bars 12 and 22 swing simultaneously in the vicinity of the closed position, the first lower tip 12A and the second lower tip 22A becomes easy to interfere, and by providing a time difference as described above, interference between the first lower tip portion 12A and the second lower tip portion 22A can be suppressed. As a result, in this safety fence, the gap W2 between the first lower tip portion 12A and the second lower tip portion 22A is narrow, so that a gap through which a person can pass is less likely to occur.

  Moreover, in this safety fence, it can detect by the proximity sensor 19 that a person, a foreign object, etc. contact the 1st, 2 upper bars 11, 21 and the 1st, 2 lower bars 12, 22, and based on the detection result The swinging of the first and second upper bars 11 and 21 and the first and second lower bars 12 and 22 can be stopped. As a result, the safety fence can improve the safety and durability of people passing through the passage 5.

(Example 3)
As shown in FIGS. 10 to 12, in the safety fence of the third embodiment, a coupling means 350 is employed instead of the coupling means 50 according to the safety fence 1 of the first embodiment. The coupling means 350 is provided between the first upper bar 11 and the second upper bar 21 and between the first lower bar 12 and the second lower bar 22.

  Accordingly, as shown in FIG. 10, the first upper tip portion 11A and the second upper tip portion 21A are in the state where the first upper bar 11 and the second upper bar 21 are in the closed position. The shape is changed so that 11A is positioned on the lower side and the second upper end portion 21A is positioned on the upper side and overlaps in the vertical direction. The first lower tip portion 12A and the second lower tip portion 22A are also changed to the same shape as the first upper tip portion 11A and the second upper tip portion 21A.

  Other configurations of the third embodiment are the same as those of the first embodiment. For this reason, about the same structure as Example 1, the same code | symbol is attached | subjected and description is abbreviate | omitted or simplified.

  Since the upper coupling means 350 and the lower coupling means 350 have the same configuration, the upper coupling means 350 will be described, and the description of the lower coupling means 350 will be omitted or simplified. In the following description, the combination of the first upper bar 11 and the second upper bar 21 and the first lower bar 12 and the second lower bar 22 in the closed position shown in FIG. Based on the attitude of the means 350, the shape and relative positional relationship of each member constituting the coupling means 350 will be described.

  The upper coupling means 350 includes a striker 390 provided at the second upper end portion 21A of the second upper bar 21 and a latch mechanism 370 provided at the first upper end portion 11A of the first upper bar 11. ing.

  As shown in FIGS. 10 and 11, the striker 390 is formed by bending a rod-shaped steel material into a substantially U shape. The striker 390 protrudes downward from the lower surface of the second upper end portion 21 </ b> A of the second upper bar 21.

  As shown in FIGS. 11 and 12, the latch mechanism 370 includes a base plate 310, a back plate 320, a fork 330, a pole 340, a tension coil spring 359, an actuator 360, and an open lever 365.

  The base plate 310, the back plate 320, the fork 330, the pole 340, and the tension coil spring 359 are accommodated in the first upper end portion 21A of the first upper bar 11. The actuator 360 is accommodated in a portion of the first upper bar 11 that is closer to the first upper axis X11 than the first upper tip portion 21A. The open lever 365 connects the pole 340 and the actuator 360 in the first upper bar 11.

  As shown in FIG. 11, a concave portion 311 that is recessed backward is formed in the central portion of a base plate 310 made of a steel plate. An entrance 312 is formed in the recess 311. The entrance 312 is notched in a groove shape that is recessed downward from the upper edge of the recess 311. In addition, shaft holes 310A and 310B are provided through the recess 311 on both the left and right sides of the entrance 312. The rear end portion of the fork support shaft 330S is fitted into the shaft hole 310A. The rear end portion of the pole support shaft 340S is fitted into the shaft hole 310B. Furthermore, attachment holes 310 </ b> C and 310 </ b> D are provided in both left and right ends of the base plate 310.

  An entrance 321 is formed in the steel plate back plate 320. The entrance 321 is cut out in a groove shape recessed downward from the upper end edge of the back plate 320. Further, the back plate 320 is provided with shaft holes 320 </ b> A and 320 </ b> B on both the left and right sides of the entrance 321. The front end portion of the fork support shaft 330S is fitted into the shaft hole 320A. The front end portion of the pole support shaft 340S is fitted into the shaft hole 320B. Furthermore, attachment holes 320 </ b> C and 320 </ b> D are provided through the left and right ends of the back plate 320.

  Although not shown, two bolts are inserted into the mounting holes 310C and 310D of the base plate 310 and the mounting holes 320C and 320D of the back plate 320, and are further provided with mounting holes (not shown) provided in the first upper end portion 21A. The base plate 310 and the back plate 320 are assembled to the first upper bar 211 in a state where the entrance 312 and the entrance 321 overlap in the front-rear direction. A striker 390 can enter the entrances 312 and 321.

  The fork 330 and the pole 340 are thick steel plate members. The fork 330 is swingably supported on the fork support shaft 330S. The pole 340 is supported on the pole support shaft 340S so as to be swingable.

  The fork 330 is formed with a first convex portion 330B located on the bottom side of the entrances 312 and 321 and a second convex portion 330C located on the entrance side of the entrances 312 and 321. A latch surface 330E that can come into contact with a stopper surface 340B of the pole 340, which will be described later, is formed at the tip of the first convex portion 330B that faces the pole 340. Further, a groove 330D is formed between the first convex portion 330B and the second convex portion 330C in the fork 330. The striker 390 that has entered the entrances 312 and 321 is accommodated in the groove 330D.

  A stopper surface 340B is formed on the pole 340. The stopper surface 340B is a curved surface that curves in an arc shape, and is formed so as to be able to face the above-described latch surface 330E. The arc constituting the stopper surface 340B is interrupted on the fork 330 side, and a sliding surface 340C extending from the arc to the shaft hole 340A side of the pole 340 is formed.

  One end of the tension coil spring 359 is locked to the fork 330, and the other end is formed on the pole 340. The fork 330 is urged by the tension coil spring 359 to swing clockwise around the fork support shaft 330S toward the paper surface of FIG. The pole 340 is urged by the tension coil spring 359 to swing counterclockwise around the pole support shaft 340S toward the paper surface of FIG.

  An output unit 361 is provided on the right end side of the actuator 360. The actuator 360 is controlled by a control unit (not shown) to move the output unit 361 forward and backward. The open lever 365 has one end connected to the output unit 361 and the other end connected to the pole 340.

  In the safety fence of Example 3 having such a configuration, when the set of the first upper bar 11 and the second upper bar 21 swings from the open position to the closed position shown in FIG. As shown by a two-dot chain line at 10, it swings later than the first upper bar 11. The same applies to the set of the first lower bar 12 and the second lower bar 22.

  Then, the striker 390 enters the entrances 312 and 321 of the latch mechanism 370 in the state shown in FIG. 12B, and fits in the groove portion 330D while pushing the first convex portion 330B of the fork 330 downward.

  Then, as shown in FIG. 12A, when the left end surface of the first convex portion 330B is displaced below the sliding surface 340C of the pole 340, the pole 340 is biased by the tension coil spring 359 and swings. The stopper surface 340B of the pole 340 contacts the latch surface 330E of the fork 330. As a result, the latch mechanism 370 is in a latched state in which the striker 390 is locked.

  Thus, the upper coupling means 350 causes the striker 390 and the latch mechanism 370 to connect the first upper tip portion 11A and the second upper tip portion 21A of the first and second upper bars 11, 21 in the closed position shown in FIG. Join. Similarly, the lower coupling means 350 couples the first lower tip 12A and the second lower tip 22A of the first and second lower bars 12 and 22 in the closed position shown in FIG.

  On the other hand, when the pair of the first upper bar 11 and the second upper bar 21 swings from the closed position shown in FIG. 10 from the open position, the second upper bar 21 moves as shown by a two-dot chain line in FIG. 1 Swings before the upper bar 11. The same applies to the set of the first lower bar 12 and the second lower bar 22.

  Prior to the swinging of the second upper bar 21 and the second lower bar 22 to the open position, the actuator 360 is controlled by a control unit (not shown) to retract the output unit 361. As a result, the pole 340 is pulled by the open lever 365 in the latch mechanism 370 in the state shown in FIG. For this reason, as shown in FIG. 12B, the stopper surface 340B of the pole 340 is separated from the latch surface 330E of the fork 330. For this reason, the fork 330 is urged by the tension coil spring 359 and swings, and the striker 390 is pushed by the first convex portion 330 </ b> B and is detached from the entrances 312 and 321. As a result, the latch mechanism 370 enters an unlatched state where the striker 390 is not locked.

  In the safety fence of the third embodiment, the striker 390 and the latch mechanism 370 constituting the coupling means 350 are used to form the first upper end 11A and the second upper end of the first and second upper bars 11 and 21 in the closed position shown in FIG. The front end 21A is coupled, and the first lower front end 12A and the second lower front end 22A of the first and second lower bars 12 and 22 in the closed position shown in FIG. 10 are coupled. Thereby, even if a load acts on the first and second upper bars 11 and 21 and the first and second lower bars 12 and 22, the first upper tip part 11A and the second upper tip part 21A are not easily displaced, The first lower tip portion 12A and the second lower tip portion 22A are unlikely to shift, and as a result, a gap through which a person can pass is less likely to occur.

  Therefore, in the safety fence of the third embodiment, the first and second upper bars 11 and 21 and the first and second lower bars 12 and 22 in the closed position are the passage 5 as in the safety fence 1 of the first and second embodiments. Can be reliably maintained.

Example 4
As shown in FIG. 13, in the safety fence of the fourth embodiment, a coupling means 450 is employed instead of the coupling means 50 according to the safety fence 1 of the first embodiment. The coupling means 450 is provided between the first upper bar 11 and the second upper bar 21 and between the first lower bar 12 and the second lower bar 22.

  Other configurations of the fourth embodiment are the same as those of the first embodiment. For this reason, about the same structure as Example 1, the same code | symbol is attached | subjected and description is abbreviate | omitted or simplified.

  The coupling means 450 includes a first bent portion 451 in which the shapes of the first upper tip portion 11A and the first lower tip portion 12A are changed from the first embodiment, and the second upper tip portion 21A and the second lower tip portion. The shape of 22A has the 2nd bending part 452 changed from Example 1. FIG.

  With the first and second upper bars 11 and 21 and the first and second lower bars 12 and 22 in the closed position, the first bent portion 451 bends forward after extending rightward, and further bent leftward. After the second bent portion 452 extends leftward, the second bent portion 452 is bent backward, and further bent rightward, so that the first bent portion 451 and the second bent portion 452 are fitted to each other.

  In the safety fence of the fourth embodiment, even if a load is applied to the first and second upper bars 11 and 21 and the first and second lower bars 12 and 22 by such a coupling means 450, the first upper end portion 11A. And the second upper tip portion 21A are not easily displaced, and the first lower tip portion 12A and the second lower tip portion 22A are not easily displaced. As a result, a gap through which a person can pass is unlikely to occur.

  Therefore, in the safety fence of the fourth embodiment, the first and second upper bars 11 and 21 and the first and second lower bars 12 and 22 in the closed position are the passage 5 as in the safety fence 1 of the first to third embodiments. Can be reliably maintained.

(Example 5)
As shown in FIGS. 14A and 14B, the safety fence of the fifth embodiment employs a coupling means 550 instead of the coupling means 50 according to the safety fence 1 of the first embodiment. The coupling means 550 is provided between the first upper bar 11 and the second upper bar 21 and between the first lower bar 12 and the second lower bar 22.

  Other configurations of the fifth embodiment are the same as those of the first embodiment. For this reason, about the same structure as Example 1, the same code | symbol is attached | subjected and description is abbreviate | omitted or simplified.

  The coupling means 550 includes an engagement hole portion 551 in which the shapes of the first upper tip portion 11A and the first lower tip portion 12A are changed from those of the first embodiment, and the second upper tip portion 21A and the second lower tip portion. It has the engagement convex part 552 by which the shape of 22A is changed from Example 1. FIG.

  In a state where the first and second upper bars 11 and 21 and the first and second lower bars 12 and 22 are in the closed position, the engagement hole 551 has a circular cross section and forms a space penetrating in the vertical direction. Then, the engaging convex portion 552 has a cylindrical shape and protrudes downward, and the engaging hole portion 551 and the engaging convex portion 552 are fitted to each other.

  In the safety fence of the fifth embodiment, even if a load is applied to the first and second upper bars 11 and 21 and the first and second lower bars 12 and 22 by such a coupling means 550, the first upper tip portion 11A. And the second upper tip portion 21A are not easily displaced, and the first lower tip portion 12A and the second lower tip portion 22A are not easily displaced. As a result, a gap through which a person can pass is unlikely to occur.

  Therefore, in the safety fence of the fifth embodiment, the first and second upper bars 11 and 21 and the first and second lower bars 12 and 22 in the closed position are the passage 5 as in the safety fence 1 of the first to fourth embodiments. Can be reliably maintained.

(Example 6)
In the safety fence of the sixth embodiment, the coupling means 50 shown in FIGS. 2 and 7 is replaced with the length adjustment mechanism 660 shown in FIGS. 15 to 18 instead of the length adjustment mechanism 60 according to the safety fence 1 of the first embodiment. Is adopted. Other configurations of the sixth embodiment are the same as those of the first embodiment. For this reason, about the same structure as Example 1, the same code | symbol is attached | subjected and description is abbreviate | omitted or simplified.

  A specific configuration of the upper length adjusting mechanism 660 provided in the second upper bar 21 will be described with reference to FIGS. 15 to 18. Since the lower length adjustment mechanism 660 provided in the second lower bar 22 is the same as the upper length adjustment mechanism 660, description thereof is omitted or simplified. Further, in the following description, the length of the first upper bar 11 and the second upper bar 21 and the first lower bar 12 and the second lower bar 22 in the closed position shown in FIG. The shape and relative positional relationship of each member constituting the length adjusting mechanism 660 will be described with reference to the posture of the length adjusting mechanism 660.

  As shown in FIGS. 15 to 17A, the length adjusting mechanism 660 includes a fixed plate 661, a movable plate 662, a reinforcing plate 669, a wire winding drum 681, a ratchet 663, a first gear 611, and a second gear 612. , A third gear 613, a fourth gear 614, a stopper pin 619, and a motor 685. The movable plate 662 and the motor 685 also serve as the retightening mechanism 680.

  As shown in FIG. 16, the fixed plate 661 is made of a substantially rectangular plate material. Three motor support portions 661A are formed on the right side of the central portion of the fixed plate 661. The motor support portion 661A is formed by bending an inner portion of a U-shaped notch formed in the fixed plate 661 forward in a crank shape. One motor support portion 661A is positioned below the other two motor support portions 661A. Each motor support portion 661A is provided with a through hole, and three set screws 678 shown in FIG. 15 are inserted into each through hole.

  As shown in FIG. 16, a first arc groove 661J and a straight groove 661L are formed in a portion on the left side of the center portion of the fixed plate 661. The first arc groove 661J extends from the upper end portion 661K to the lower end portion in a semicircular arc that swells leftward. The straight groove 661L is continuous with the lower end portion of the first arc groove 661J, and extends substantially linearly to the right.

  Through holes 661B are provided through the four corners of the fixed plate 661. The fixing plate 661 has four connecting members (not shown) inserted through the through holes 661B, and each connecting member is connected to a connecting portion (not shown) provided inside the second upper bar 21. 2 assembled to the upper bar 21.

  A through hole 661C is provided on the left side of the fixed plate 661 with respect to the first arc groove 661J. A through hole 661D is provided on the right side of the lower plate motor support portion 661A in the fixed plate 661.

  The movable plate 662 is made of a substantially rectangular plate whose length in the left-right direction is shorter than that of the fixed plate 661. The movable plate 662 is disposed on the front side with respect to the fixed plate 661. A long hole 662A that is long in the left-right direction is provided in the left end portion of the movable plate 662. A long hole 662 </ b> B that is long in the left-right direction is provided through the lower edge of the right end of the movable plate 662.

  A second arc groove 662J is formed on the movable plate 662 on the right side of the long hole 662A. The second arc groove 662J extends from the upper end portion to the lower end portion in a semicircular arc that swells leftward.

  Through holes 662Q and 662R are provided through the movable plate 662 above and below the long hole 662A. A through hole 662 </ b> F is formed through the center of the movable plate 662. A through hole 662G is provided between the second arc groove 662J and the through hole 662F in the movable plate 662. A through hole 662D is provided at the lower end side of the central portion of the movable plate 662, and a spring locking piece 662E is provided so as to protrude forward.

  A long hole 662M that is long in the left-right direction is penetrated in a portion on the right side of the central portion of the movable plate 662, and a long hole 662N that is long in the left-right direction is penetrated below the long hole 662M. A through hole 662C is provided on the right side of the long hole 662M in the movable plate 662.

  The movable plate 662 is connected to the fixed plate 661 by two guide shafts 672. A rear end portion of a multi-stage cylindrical guide shaft 672 is inserted into the through hole 661C and the through hole 661D of the fixing plate 661, respectively, and fixed by crimping. The front end portions of the guide shafts 672 are inserted into the long holes 662A and 662B of the movable plate 662, respectively. Caps 672C for restricting the guide shafts 672 from being removed from the long holes 662A and 662B are caulked and fixed to the front end portions of the guide shafts 672. Each guide shaft 672 is slidable in the left-right direction within the long holes 662A and 662B. Accordingly, as shown in FIGS. 17B, 18A, and 18B, the movable plate 662 can be displaced relative to the fixed plate 661 in the left-right direction. Each motor support portion 661A of the fixed plate 661 passes through the long holes 662M and 662N and protrudes forward from the movable plate 662, and does not hinder the relative displacement of the movable plate 662 with respect to the fixed plate 661.

  As shown in FIG. 15, the reinforcing plate 669 is formed by bending a substantially rectangular plate material into three stages. A through hole 669F is provided through the right end portion of the reinforcing plate 669. Through holes 669G and 669H are provided through the central portion of the reinforcing plate 669. Through holes 669Q and 669R are formed through the left end portion of the reinforcing plate 669. An opening 669 </ b> W through which the wire 90 passes is cut out at a bent portion from the right end portion to the center portion of the reinforcing plate 669.

  Fastening members (not shown) are inserted into the through holes 662Q and 662R of the movable plate 662 and the through holes 669Q and 669R of the reinforcing plate 669, and are fixed by crimping. The through holes 669F of the reinforcing plate 669 and the through holes of the movable plate 662 The front end portion and the rear end portion of the support shaft 676 shown in FIGS. 15 and 16 are inserted into 662F and fixed by crimping, and the through hole 669G of the reinforcing plate 669 and the through hole 662G of the movable plate 662 are The reinforcing plate 669 is assembled to the movable plate 662 by inserting the front end portion and the rear end portion of the support shaft 616 shown in FIGS.

  As shown in FIG. 16, the wire take-up drum 681 is a combination of a main body 682, a spring 683, and a spring holding 684.

  The main body 682 has a substantially cylindrical shape whose center axis is a winding axis X681 extending in the front-rear direction and whose rear end is closed. The main body 682 is formed with a first protrusion 682A and external teeth 682B. The first protruding portion 682A protrudes forward from the rear end portion of the main body portion 682 in a cylindrical shape with the winding axis X681 as the central axis. The external teeth 682B are formed on the outer peripheral surface of the rear end portion of the main body portion 682. The outer peripheral surface of the main body portion 682 is recessed between the front end portion and the rear end portion, and the wire 90 is wound around the other end portion 90B of the wire 90 locked to the recessed portion.

  A small-diameter first gear 611 is assembled to the rear end of the main body 682 so as to be integrally rotatable.

  The spring holding portion 684 has a substantially cylindrical shape with the winding axis X681 as the central axis and the front end portion closed. The spring holding portion 684 has an outer diameter smaller than the inner diameter of the main body portion 682 and is housed in the main body portion 682.

  The spring spring 683 is formed by winding a leaf spring in a spiral shape and is accommodated in the spring holding portion 684. One end of the spring 683 is locked to the first protrusion 682 </ b> A of the main body 682. On the other hand, the other end of the mainspring spring 683 is locked to the inner peripheral surface of the spring holding portion 684.

  The main body 682, the mainspring 683, and the spring holding portion 684 are disposed between the movable plate 662 and the reinforcing plate 669 in a combined state, and the first gear 611, the first protrusion 682A of the main body 682, the spring A support shaft 676 is inserted into the holding portion 684. As a result, the spring holding portion 684 is fixed to the reinforcing plate 669 so as not to rotate, and the first gear 611 and the main body portion 682 are supported by the movable plate 662 so as to be rotatable around the winding axis X681.

  As shown in FIGS. 17B, 18A, and 18B, when the movable plate 662 is displaced relative to the fixed plate 661 in the left-right direction, the wire winding drum 681 is also integrated with the movable plate 662. And is displaced relative to the fixed plate 661 in the left-right direction. The mainspring 683 urges the main body 682 to rotate around the winding axis X681 in the clockwise direction toward the plane of FIG. 17 and FIG. 18, that is, in the winding direction of the wire 90.

  As shown in FIG. 16, the ratchet 663 is a lever-shaped member in which a shaft hole 663 </ b> B having a pivot axis X <b> 663 extending in the front-rear direction as a central axis is provided. The ratchet 663 extends upward while tilting rightward from the swing axis X663 and then bending and extending rightward. At the bent portion of the ratchet 663, an engaging claw 663C that can engage with the external teeth 682B of the main body 682 protrudes leftward. An upper surface of a portion extending to the right of the ratchet 663 is a contacted portion 663E that can be in contact with a cam convex portion 688C of a cam 688 described later.

  With the ratchet 663 disposed on the front side with respect to the movable plate 662, the swing shaft 674 is inserted into the shaft hole 663B from the front. Then, the rear end portion of the swing shaft 674 is inserted into the through hole 662D of the movable plate 662, and is fixed by caulking. As a result, the ratchet 663 is supported by the movable plate 662 so as to be swingable around the swing axis X663.

  As shown in FIGS. 16 and 17A, the coil portion of the torsion coil spring 675 is inserted into the front end portion of the swing shaft 674. One end of the torsion coil spring 675 is locked to a spring locking piece 662E of the movable plate 662. The other end of the torsion coil spring 675 is locked to the ratchet 663.

  As shown in FIGS. 17B, 18A, and 18B, when the movable plate 662 is displaced relative to the fixed plate 661 in the left-right direction, the ratchet 663 is also displaced integrally with the movable plate 662. , Relative to the fixed plate 661 in the left-right direction. The torsion coil spring 675 causes the ratchet 663 to engage with the outer teeth 682B of the main body 681 in the clockwise direction around the swing axis X663 toward the paper surface of FIGS. Is energized.

  The engagement claw 663C and the external teeth 682B are formed so that the main body 682 of the wire winding drum 681 is clockwise around the winding axis X681 toward the paper surface of FIGS. 17 and 18, that is, in the winding direction of the wire 90. When trying to rotate, the engagement claw 663C escapes from the external teeth 682B and allows the wire 90 to be wound by the main body 682. Further, the engaging claw 663C and the external teeth 682B are arranged so that the main body portion 682 of the wire winding drum 681 rotates counterclockwise around the winding axis X681 toward the plane of FIG. 17 and FIG. When it is going to rotate in the direction, the engaging claw 663C meshes with the external teeth 682B to prevent the wire 90 from being pulled out from the main body 682.

  As shown in FIG. 15, the motor 685 is fixed to the fixed plate 661 by screwing three set screws 678 from the rear in a state where the motor 685 is disposed on the front side with respect to the movable plate 662.

  The motor 685 operates under the control of a control unit (not shown), thereby rotating the cam 688 forward and backward around the cam axis X688 as shown in FIGS.

  The cam 688 has a cam projection 688C. As shown in FIG. 18B, the cam 688 rotates around the cam axis X688, so that the cam convex portion 688C can come into contact with the contacted portion 663E of the ratchet 663. When the cam convex portion 688C pushes down the contacted portion 663E of the ratchet 663, the ratchet 663 swings around the swing axis X663 in the counterclockwise direction toward the paper surface of FIGS. 17 and 18, and the engaging claw 663C. Is separated from the external teeth 682B of the main body 681.

  As shown in FIGS. 15 and 16, the cam hole 688B is recessed in the cam hole 688B at a position deviated from the cam axis X688. The left end of the transmission rod 677 is connected to the cam hole 688B by a locking pin 677C. The right end portion of the transmission rod 677 is connected to the through hole 662C of the movable plate 662 by a locking pin 677D.

  As shown in FIGS. 17 (b), 18 (a) and 18 (b), when the cam 688 rotates forward and backward around the cam axis X688, the transmission rod 677 is displaced in the left-right direction and is movable. The plate 662 is pushed and pulled, and the movable plate 662 is displaced relative to the fixed plate 661 in the left-right direction.

  As shown in FIGS. 15 and 16, the large-diameter second gear 612 and the small-diameter third gear 613 are a single member. The second gear 612 and the third gear 613 are disposed between the movable plate 662 and the reinforcing plate 669 and are rotatably supported by the support shaft 616. As shown in FIGS. 16 to 18, the second gear 612 is engaged with the first gear 611.

  As shown in FIGS. 15 and 16, the large-diameter fourth gear 614 is disposed between the movable plate 662 and the reinforcing plate 669 and is rotatably supported by the support shaft 617. The support shaft 617 passes through the shaft hole of the fourth gear 614 from the rear, is inserted into the through hole 669H of the reinforcing plate 669, and is fixed by caulking. The fourth gear 614 meshes with the third gear 613. A through hole 614 </ b> A is provided on the outer peripheral edge side of the fourth gear 614.

  As shown in FIG. 16, the stopper pin 619 is inserted into the first arc groove 661J or the linear groove 661L of the fixed plate 661 from the rear, passes through the second arc groove 662J of the movable plate 662, and passes through the fourth gear 614. It is inserted into the hole 614A and fixed by caulking.

  The rotation of the main body 682 of the wire take-up drum 681 is transmitted to the stopper pin 619 by the first to fourth gears 611 to 614.

    As shown in FIGS. 18A and 18B, when the movable plate 662 is relatively displaced to the left with respect to the fixed plate 661, the rotation of the main body 682 of the wire take-up drum 681 is the first. When transmitted to the stopper pin 619 by the four gears 611 to 614, the stopper pin 619 is displaced along the first arc groove 661J of the fixed plate 661 and the second arc groove 662J of the movable plate 662. When the number of teeth of each of the first to fourth gears 611 to 614 is a predetermined length for positioning the pair of the first upper bar 11 and the second upper bar 21 at the open position, the wire 90 is pulled out. Further, the stopper pin 619 is set so as to stop against the upper end portion 661K of the first arc groove 661J.

  On the other hand, as shown in FIGS. 17B and 18A, when the movable plate 662 is displaced relative to the fixed plate 661 in the left-right direction, that is, when the wire 90 is tightened and released. The stopper pin 619 is located on the lower end side of the second arc groove 662J of the movable plate 662, and is displaced in the left-right direction within the linear groove 661L of the fixed plate 661.

  When the set of the first upper bar 11 and the second upper bar 21 swings from the open position shown in FIG. 7 to the closed position shown in FIG. 2, the first upper tip 11A of the first upper bar 11 and the second upper bar 21 is approached to the second upper end portion 21A. At this time, in the upper length adjusting mechanism 660, as shown in FIG. 18A, the cam convex portion 688C does not push down the contacted portion 663E of the ratchet 663, and the transmission rod 677 causes the movable plate to move. 662 is relatively displaced to the left with respect to the fixed plate 661.

  In this state, the engaging claws 663 </ b> C and the external teeth 682 </ b> B allow the wire 90 to be wound by the main body 682 of the wire winding drum 681, while prohibiting the wire 90 from being pulled out from the main body 682. Therefore, if even a slight slack occurs in the intermediate portion 90C of the wire 90 constituting the upper coupling means 50, the upper length adjusting mechanism 660 biases the main body portion 682 of the wire take-up drum 681 against the spring spring 683. Then, the other end portion 90B of the wire 90 is immediately wound up to eliminate the slack.

  When the set of the first upper bar 11 and the second upper bar 21 reaches the closed position shown in FIG. 2, the upper length adjusting mechanism 660 has the cam 688 shown in FIG. As shown in FIG. 17B, the transmission rod 677 relatively displaces the movable plate 662 to the right with respect to the fixed plate 661. For this reason, the main body 682 in which the drawing of the wire 90 is prohibited is also displaced rightward together with the movable plate 662, and the wire 90 is pulled. As a result, the tension acting on the intermediate portion 90C of the wire 90 stretched between the first upper end portion 11A and the second upper end portion 21A increases.

  Thus, the upper coupling means 50 has the first upper end 11A of the first upper bar 11 and the second upper bar 11 in a state where the set of the first upper bar 11 and the second upper bar 21 is in the closed position shown in FIG. The second upper end portion 21A of the upper bar 21 is securely coupled.

  On the other hand, when the set of the first upper bar 11 and the second upper bar 21 swings from the closed position shown in FIG. 2 to the open position shown in FIG. The cam 688 shown rotates in the clockwise direction toward the plane of FIG. 17 and FIG. 18, and the transmission rod 677 relatively displaces the movable plate 662 to the left with respect to the fixed plate 661 as shown in FIG. As a result, the main body 682 is also displaced leftward together with the movable plate 662, and the tightening of the wire 90 is released. Then, the cam 688 shown in FIG. 18A further rotates clockwise toward the paper surface of FIGS. 17 and 18, and the cam convex portion 688C is brought into contact with the ratchet 663 as shown in FIG. 18B. The part 663E is pushed down.

  In this state, the engaging claws 663C are separated from the external teeth 682B, and the wire 90 is allowed to be pulled out from the main body 682 of the wire winding drum 681. For this reason, the upper length adjusting mechanism 660 follows the separation of the first upper end portion 11A of the first upper bar 11 and the second upper end portion 21A of the second upper bar 21 from each other. The wire 90 is pulled out from the main body 682 so that the intermediate portion 90C is stretched between the first upper tip portion 11A and the second upper tip portion 21A without slack.

  At this time, the rotation of the main body 682 is transmitted to the stopper pin 619 by the first to fourth gears 611 to 614, and the stopper pin 619 is displaced along the first and second arc grooves 661J and 662J. Then, the stopper pin 619 is brought into contact with the upper end portion 661K of the first arc groove 661J, thereby restricting the drawing length of the wire 90 to a predetermined length. As a result, the upper length adjustment mechanism 660 accurately positions the set of the first upper bar 11 and the second upper bar 21 at the open position.

  Although not described, the lower length adjusting mechanism 660 operates in the same manner as the upper length adjusting mechanism 660 and follows the swing of the set of the first lower bar 12 and the second lower bar 22. Then, the wire 90 is wound and pulled out so that the intermediate portion 90C of the wire 90 is stretched between the first lower tip portion 12A and the second lower tip portion 22A without slack. Further, the lower length adjusting mechanism 660 is configured such that the pair of the first lower bar 12 and the second lower bar 22 is brought into the closed position by the movable plate 662 constituting the tightening mechanism 680 and the cam 688 of the motor 685. In a certain state, the tension acting on the intermediate portion 90C of the wire 90 stretched between the first lower tip portion 12A and the second lower tip portion 22A is increased. Further, the lower length adjusting mechanism 660 regulates the drawing length of the wire 90 to a predetermined length by the first to fourth gears 611 to 614, the stopper pin 619, the first and second arc grooves 661J and 662J, and the like. Then, the set of the first lower bar 12 and the second lower bar 22 is accurately positioned at the open position.

  Thus, the lower coupling means 50 also has the first lower tip 12A of the first lower bar 12 and the first lower bar 12 in a state where the pair of the first lower bar 12 and the second lower bar 22 is in the closed position. 2 The second lower end 22A of the lower bar 22 is securely coupled.

  In the safety fence of the sixth embodiment, a load is applied to the first and second upper bars 11 and 21 and the first and second lower bars 12 and 22 by the coupling means 50 employing such a length adjusting mechanism 660. In addition, the first upper tip portion 11A and the second upper tip portion 21A are not easily misaligned, and the first lower tip portion 12A and the second lower tip portion 22A are hardly misaligned. It is difficult for gaps to occur.

  Therefore, in the safety fence of Example 6, like the safety fence 1 of Examples 1 to 5, the first and second upper bars 11 and 21 and the first and second lower bars 12 and 22 in the closed position are the passages 5. Can be reliably maintained.

  Further, in this safety fence, the length adjustment mechanism 660 has a simple configuration, the first to fourth gears 611 to 614, the stopper pin 619, the first and second arc grooves 661J and 662J, etc. By restricting to a predetermined length, the set of the first upper bar 11 and the second upper bar 21 and the set of the first lower bar 12 and the second lower bar 22 can be accurately positioned at the open position.

(Example 7)
In the safety fence of the seventh embodiment, as shown in FIG. 19, key cylinders 769 are provided on the second upper bar 21 and the second lower bar 22 of the safety fence 1 of the first embodiment. Moreover, in the safety fence of Example 7, as shown in FIG.20 and FIG.21, the opening 63H is provided in the ratchet 63 of the length adjustment mechanism 60 which concerns on the safety fence 1 of Example 1. FIG. Other configurations of the seventh embodiment are the same as those of the first embodiment. For this reason, about the same structure as Example 1, the same code | symbol is attached | subjected and description is abbreviate | omitted or simplified.

  As shown in FIG. 19, the key cylinder 769 is provided at a position corresponding to the length adjustment mechanism 60 according to the safety fence 1 of the first embodiment, and the keyholes are provided on the rear surfaces of the second upper bar 21 and the second lower bar 22. It is exposed to. By inserting the key 769K into the key hole of the key cylinder 769 and rotating it in the R1 direction, the key cylinder 769 rotates in the R1 direction around the cylinder axis X769.

  Although not shown, the key cylinder 769 extends toward the side opposite to the keyhole and enters the length adjusting mechanism 60. As shown in FIGS. 20 and 21, a release arm 769A is fixed to the end of the key cylinder 769 opposite to the keyhole. The opening 63H of the ratchet 63 includes a release arm 769A.

  The release arm 769A rotates integrally with the key cylinder 769 around the cylinder axis X769. FIG. 20 shows the posture of the release arm 769A in a state where the key cylinder 769 does not rotate in the R1 direction around the cylinder axis X769. When the key cylinder 769 rotates in the R1 direction around the cylinder axis X769, the release arm 769A rotates counterclockwise toward the paper surface of FIG.

  As shown in FIG. 20, in a state where the key cylinder 769 does not rotate in the R1 direction around the cylinder axis X769, an open space is secured above the release arm 769A in the opening 63H. As a result, when the cam projection 88C of the cam 88 that is driven and rotated by the motor 85 of the length adjustment mechanism 60 pushes down the contacted portion 63E of the ratchet 63, the ratchet 63 swings without being blocked by the release arm 769A. It swings clockwise around the movement axis X63 toward the paper surface of FIG. 20, and the engaging claw 63C is separated from the external teeth 82B of the main body 81. As a result, the drawing of the wire 90 from the main body 82 of the wire winding drum 81 is allowed.

  Further, in this safety fence, when power cannot be supplied to the motor 85 of the length adjusting mechanism 60 due to a power failure or the like, the key 769K is inserted into the key hole of the key cylinder 769 and the key cylinder 769 is rotated around the cylinder axis X769 in the R1 direction. The release arm 769A is rotated counterclockwise toward the paper surface of FIG. As a result, when the release arm 769A pushes down the ratchet 63 while contacting the lower end edge of the opening 63H of the ratchet 63, the ratchet 63 swings clockwise around the swing axis X63 toward the paper surface of FIG. The engaging claws 63C are separated from the external teeth 82B of the main body 81. Then, the release arm 769 </ b> A is in a state like a stick with respect to the ratchet 63, and maintains the state in which the ratchet 63 swings. As a result, the drawing of the wire 90 from the main body 82 of the wire winding drum 81 is allowed.

  Therefore, in the safety fence of the seventh embodiment, even when power cannot be supplied to the motor 85 of the length adjustment mechanism 60 due to a power failure or the like, the first upper bar 11 and the second upper bar 21 are set by the operation on the key cylinder 769, The set of the first lower bar 12 and the second lower bar 22 can be safely swung to the open position shown in FIG.

(Example 8)
In the safety fence of the eighth embodiment, as shown in FIGS. 22 and 23, the first upper end 11A of the first upper bar 11 and the first lower side of the first lower bar 12 according to the safety fence of the third embodiment. A key cylinder 869 is provided at the distal end portion 12A. Moreover, in the safety fence of Example 8, the protrusion part 361T is provided in the output part 361 of the actuator 360 which concerns on the safety fence of Example 3. FIG. The protruding portion 361T protrudes in a columnar shape upward from an intermediate portion in the left-right direction of the output portion 361. Other configurations of the eighth embodiment are the same as those of the third embodiment. For this reason, about the structure same as Example 3, the same code | symbol is attached | subjected and description is abbreviate | omitted or simplified.

  As shown in FIG. 22, the key cylinder 869 exposes the keyholes on the rear surfaces of the second upper bar 21 and the second lower bar 22. By inserting the key 869K into the key hole of the key cylinder 869 and rotating it in the R2 direction, the key cylinder 869 rotates in the R2 direction around the cylinder axis X869.

  A release arm 869A is fixed to the end of the key cylinder 869 opposite to the keyhole. The release arm 869A rotates integrally with the key cylinder 869 around the cylinder axis X869. FIG. 22 shows the posture of the release arm 869A in a state where the key cylinder 869 does not rotate in the R2 direction around the cylinder axis X869. In FIG. 22, the latch mechanism 370 is in a latched state in which the striker 390 is locked.

  As shown in FIG. 22, in a state where the key cylinder 869 is not rotating in the R2 direction around the cylinder axis X869, the release arm 869A extends upward and is positioned to the right with respect to the protruding portion 361T of the output portion 361. Is located. Thus, when the actuator 360 is operated, the output unit 360 moves backward without being blocked by the release arm 869A. As a result, the latch mechanism 370 enters an unlatched state where the striker 390 is not locked.

  Further, in this safety fence, when power cannot be supplied to the actuator 360 due to a power failure or the like, the key 869K is inserted into the key hole of the key cylinder 869, the key cylinder 869 is rotated around the cylinder axis X869 in the R2 direction, and the release arm 869A Is rotated counterclockwise toward the paper surface of FIG. As a result, the release arm 869A abuts against the protruding portion 361T and pushes it to the left, causing the output portion 360 to retreat. Then, the release arm 869 </ b> A becomes a stick-like state with respect to the output unit 360 and maintains the output unit 360 in a retracted state. As a result, the latch mechanism 370 enters an unlatched state where the striker 390 is not locked.

  Therefore, in the safety fence of the eighth embodiment, even when power cannot be supplied to the actuator 360 due to a power failure or the like, the set of the first upper bar 11 and the second upper bar 21 and the first lower bar 12 and the The set of the second lower bar 22 can be safely swung to the open position.

  In the above, the present invention has been described with reference to the first to eighth embodiments. However, the present invention is not limited to the first to eighth embodiments, and can be appropriately modified and applied without departing from the spirit of the present invention. Needless to say.

  In the first embodiment, the set of the first upper bar 11 and the second upper bar 21 and the set of the first lower bar 12 and the second lower bar 22 are closed as shown in FIG. While it swings to the position, it swings to the open position shown in FIG. 7 by the urging force of the first and second tension coil springs 14 and 24, but is not limited to this configuration. For example, in the set of the first upper bar 11 and the second upper bar 21 and the set of the first lower bar 12 and the second lower bar 22, a motor (not shown) rotates reversely, and the driving force in FIG. You may make it rock | fluctuate to the open position shown. In this case, the motor that drives the first upper bar 11 and the first lower bar 12 and the motor that drives the second upper bar 21 and the second lower bar 22 are synchronously rotated, and the number of rotations is controlled to be equal. Thus, the first upper bar 11 and the first lower bar 12, and the second upper bar 21 and the second lower bar 22 can be swung in the open position. It should be noted that the first and second tension coil springs 14 and 24 may be adjusted in biasing force so as to balance the weights of the first and second upper bars 11 and 21 and the first and second lower bars 12 and 22. Good. Thereby, the load on the motor when the first and second upper bars 11 and 21 and the first and second lower bars 12 and 22 are swung to the open position can be reduced.

  In the first embodiment, the length until the set of the first upper bar 11 and the second upper bar 21 and the set of the first lower bar 12 and the second lower bar 22 reach the open position shown in FIG. The adjustment mechanism 60 separates the engaging claw 63C from the external teeth 82B and allows the wire 90 to be pulled out from the main body 82 of the wire winding drum 81, but is not limited to this configuration. For example, the length adjusting mechanism is just before the set of the first upper bar 11 and the second upper bar 21 and the set of the first lower bar 12 and the second lower bar 22 reach the open position shown in FIG. 60 may engage the engaging claws 63 </ b> C with the external teeth 82 </ b> B to prohibit the drawing of the wire 90 from the main body 82 of the wire winding drum 81. In this case, the wire 90 is loosened by the urging force of the first and second tension coil springs 14 and 24 that swing the first and second upper bars 11 and 21 and the first and second lower bars 12 and 22 to the open position. be able to.

  INDUSTRIAL APPLICABILITY The present invention can be used for a platform provided alongside a track on which a track vehicle travels.

DESCRIPTION OF SYMBOLS 1 ... Platform safety fence 9 ... Track vehicle 3 ... Track 5 ... Passage 7 ... Platform 31 ... First gate pillar 32 ... Second gate pillar 11, 12 ... First gate bar (11 ... First upper bar, 12 ... First lower side bar)
21, 22 ... second gate bar (21 ... second upper bar, 22 ... second lower bar)
11A, 12A ... first tip (11A ... first upper tip, 12A ... first lower tip)
21A, 22A ... second tip (21A ... second upper tip, 22A ... second lower tip)
50, 350, 450, 550 ... coupling means 90 ... wire 90A ... one end portion of wire 90B ... other end portion of wire 90C ... middle portion of wire 60, 660 ... length adjusting mechanism 80, 680 ... retightening mechanism X11 ... first 1 upper axis X12: first lower axis X21: second upper axis X22: second lower axis L1: distance between first lower axis and second lower axis L2: first upper axis Distance between shaft center and second upper shaft center 390 ... striker 370 ... latch mechanism

Claims (6)

A platform safety fence that is provided on a platform that is provided along a track along which a track vehicle travels and that is configured to have a passage for getting on and off the track vehicle, and is capable of opening and closing the path,
First and second gate pillars that face each other across the passage and extend upward from the platform,
A first gate bar supported swingably on the first gate post;
A second gate bar supported swingably on the second gate post;
The first gate bar and the second gate bar are swingable between a closed position that extends close to each other and closes the passage, and an open position that extends upward and opens the passage,
Between the first gate bar and the second gate bar, with the first gate bar and the second gate bar in the closed position, the first tip of the first gate bar and the second gate bar 2. A platform safety fence characterized in that a coupling means for coupling the two distal ends is provided. The coupling means has one end locked to the first gate bar, the other end locked to the second gate bar, and an intermediate portion stretched between the first tip and the second tip. Wire
Provided on at least one of the first gate bar and the second gate bar, and following the swinging of the first gate bar and the second gate bar, the intermediate portion is formed between the first tip portion and the second tip portion. The platform safety fence according to claim 1, further comprising a length adjusting mechanism that winds and pulls out the wire so that the wire is stretched without slack.   3. The platform safety fence according to claim 2, wherein the length adjusting mechanism includes a tightening mechanism that increases a tension acting on the wire in a state where the first gate bar and the second gate bar are in the closed position. . The first gate bar includes a first upper bar supported by the first gate pillar so as to be swingable around a first upper axis extending substantially parallel to the passage direction of the passage, and below the first upper axis. And a first lower bar supported by the first gate pillar so as to be swingable around a first lower axis extending substantially parallel to the first upper axis.
The second gate bar includes a second upper bar supported by the second gate pillar so as to be swingable around a second upper axis extending substantially parallel to the passage direction, and the second gate bar below the second upper axis. A second lower bar supported by the second gate pole so as to be swingable around a second lower axis extending substantially parallel to the second upper axis;
The coupling means is provided in each of the first upper bar and the second upper bar set, and the first lower bar and the second lower bar set,
A distance between the first lower axis and the second lower axis is set longer than a distance between the first upper axis and the second upper axis;
With the first upper bar and the second upper bar in the closed position, the first upper bar extends from the first upper axis toward the second portal, and the second upper bar is Extending from the second upper axis toward the first gate pillar, the first upper end of the first upper bar and the second upper end of the second upper bar are opposed to each other;
In a state where the first lower bar and the second lower bar are in the closed position, the first lower bar extends downward from the first lower axis and then bends toward the second portal. The second lower bar extends downward from the second lower axis and then bends toward the first portal, and includes a first lower tip of the first lower bar, The platform safety fence according to claim 2 or 3, wherein the second lower end of the lower bar faces the second lower bar.   When the first lower bar and the second lower bar swing in the vicinity of the closed position, one of the first lower bar and the second lower bar is the first lower bar and the second lower bar. The platform safety fence according to claim 4, wherein the platform safety fence swings before the other of the side bars. The coupling means includes a striker provided at one of the first tip portion and the second tip portion, and a latch mechanism provided at the other of the first tip portion and the second tip portion,
The latch mechanism is in a latched state in which the striker is locked while the first gate bar and the second gate bar are in the closed position, while the first gate bar and the second gate bar are swung from the closed position. The platform safety fence according to claim 1, wherein the platform safety fence is in an unlatched state in which the striker is not locked when moving.

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