JPH0433681A - Safety device for stage approach - Google Patents

Abstract

PURPOSE:To elevate a protective slope faster than the elevation of an approaching board and to prevent a trouble in the delivery in and out of stage setting, etc., by the elevation mechanism of the protective slope occurring by providing the elevation mechanism to ascend the protective slope faster than the elevation speed of the approaching board only when the approaching board is ascended and holds it at a prescribed protrusive height position at the pile wall side of a trap cellar or the lower plane part of the approaching board. CONSTITUTION:The elevation mechanism 33 which ascends the protective slope 9 faster than the elevation speed of the approaching board 6 only when the approaching board is elevated and holds it at the prescribed height protrusive position is provided at the pile wall side part of the trap cellar or the lower plane part of the approaching board 6. When the protective slope 9 provided at the inner peripheral part of the aperture part of the approaching board 6 on the plane 1 of the trap cellar or the outer peripheral part of the approaching board is not protruded over the plane 1 of the trap cellar when the approaching board is located on the same plane as that of the stage or that of the trap cellar, and also, the elevation mechanism 33 of the protective slope 9 is provided at the pile wall side part of the trap cellar or the lower plane part of the approaching board. Thereby, it is possible to prevent the elevation mechanism hindering the delivery in and out of the stage setting, etc., to the approaching board.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a safety device for approaching a stage, and in particular, to prevent a person from falling into an abutment opening on an abyss floor or from an abutment. This invention relates to a safety device for a stage abutment for preventing protruding feet etc. from being caught between the abutment base and the stage floor.

(Prior art) The abutment opening on the abyss surface after the abutment has been raised poses a risk of people falling, so a protective plate that can be raised and lowered is installed at this opening. After the abutment rises, the opening of the abutment on the abyss floor is surrounded to ensure safety against falls (Special Publications Publication No. 40-4510
Publication No.).

FIGS. 16 to 19 are diagrams showing a schematic configuration of the safety device, in which a rectangular abutment opening 2 (hereinafter referred to as an abutment opening) 2 is formed in the abyss surface 1. ,
A pit 3 is formed below this abyss opening 2. The abyss opening 2 has a rectangular shape slightly smaller in size than the abyss opening 2, and an abutment opening (hereinafter referred to as a stage opening) 5 formed on the stage floor 4 and an aperture. An abutment 6 that moves up and down between the opening 2 and the opening 2 is provided. The abutment platform 6 is supported by two columns 8 provided on the bottom surface 7 of the pit 3, and can be moved up and down between the stage opening 5 and the abyss opening 2 by a lifting device.

Also, on the inner periphery of the abyss opening 2, figures 17 and 18 are provided.
As shown in the figure, the protection plate 9 is provided facing upward, and when the abutment 6 is on the same plane as the abyss floor 1, the upper part of the protection plate 9 is in contact with the lower surface of the outer periphery of the abutment 6. ing. Further, a rail 10 extending in the vertical direction is fixed to the protection plate 9, as shown in FIG. 19. A guide member 11 is provided to sandwich the rail 10, and the guide member 11 is fixed to the side wall 12 of the shaft 3. Further, a fixed pulley 13 is pivotally attached to the guide member 11 so as to be freely rotatable. Further, one end of a wire rope 14 is fixed to the lower part of the protection plate 9, and this wire rope 14 is suspended from a fixed pulley 13, and a counterweight 15 is fixed to the other end of the wire rope 14. has been done.

Note that 16 indicates a person.

As shown in FIG. 16, when the abutment 6 starts to rise by the lifting device from the state where the abutment 6 is on the same plane as the abyss opening 2, the protection plate 9 rises together with the abutment 6, and the wire lobe 14 When the counterweight 15 fixed to the end of the shaft comes into contact with the bottom surface 7 of the shaft 3, the protection plate 9 stops rising.

Then, only the abutment platform 6 rises. Therefore, the protective plate 9 protrudes from the abyss opening 2, thereby preventing the person 16 etc. from falling into the pit 3.

On the other hand, when the abutment base 6 is lowered, the abutment base 6 comes into contact with the upper end of the protection plate 9, and the protection plate 9 is pushed down by the abutment base 6, so that the protection plate 9 sinks into the pit 3 from the abyss opening 2.

Therefore, when the abyss surface 1 and the abutment 6 are on the same surface, the upper part of the protection plate 9 is also on the same surface, and the protection plate 9 does not protrude from the abyss surface 1.

Although the protection plate 9 is directly pressed down by the abutment base 6, it is also possible to provide a protrusion (not shown) on the protection plate 9 and push down this protrusion.

However, in such a device, when the abutment 6 rises from the abyss opening 2 to the stage opening 5, the board protruding from the abutment 6 gets caught between the stage floor 4 and the abutment 6. It is impossible to prevent such accidents. Therefore, in order to prevent such accidents in advance, the abutment 6
There has also been proposed a device equipped with a safety device that can detect when a plate or the like is placed protruding from the top (Japanese Utility Model Publication No. 44-6846).

That is, as shown in FIGS. 20 to 22, a rectangular stage opening 5 is formed in the stage floor 4, and pillars extend from the four corners of the stage opening 5 toward the four corners of the abyss opening (not shown). 17 are erected.

In addition, box-shaped holding frames 18 as shown in FIG. 22 are fixed to the side surfaces of these pillars 17 facing oppositely to other pillars 17, respectively.

A detection rod 19 is horizontally suspended between these holding frames 18 and the opposing holding frames 18.
is always biased diagonally downward toward a part of the lower corner of the holding frame 18 by a coil spring 20 provided within the holding frame 18 . And this detection rod 19
An operating piece 21 is in contact with the lower surface of the holder, and this operating piece 21 is connected to a limit switch 22.

However, if, for example, the board 23 protrudes from the abutment base 6 when the abutment base 6 rises toward the stage floor 4,
As the abutment base 6 rises, the plate material 23 comes into contact with the detection rod 19, and the abutment base 6 rises in this state.

Then, the detection rod 19 moves along the holding frame 18 and the coil spring 20
As the detection rod 19 rises, the operating piece 21 in contact with the detection rod 19 rotates to the right in FIG. 22, and the limit switch 22 is activated, not shown. The elevating device for the abutment base 6 is stopped, and the abutment base 6 is stopped.

Therefore, the plate material 23 is prevented from being pinched between the abutment stand 6 and the stage floor surface 4.

Furthermore, a safety device as shown in FIG. 23 is also used to detect when large props or the like are protruding from the abutment. That is, between the stage floor surface 4 and the abyss floor surface 1, there is provided an abutment 6 that moves up and down between the stage opening 5 and the abyss opening 2, and this abutment 6 is provided with a support 8. It is being The abutment base 6 can be raised and lowered by a lifting device (not shown). Further, a guide member 24 is fixed to the lower part of the stage floor surface 4.

A vertical hole 25 is formed in this guide member 24, and a rod-shaped member 27 extending above the abutment 6 and to which a detection member 26 is fixed is inserted into the hole 25. A limit switch 22 is provided at the lower end of this rod-shaped member 27, and this limit switch 22 is connected to a control device 29 via a cable 28. Note that 30 indicates a large prop.

Therefore, the large implement 30 is placed on the abutment base 6 with it protruding, and when the abutment base 6 rises in this state, the end of the large implement 30 comes into contact with the detection member 26, and the abutment base 6 remains in this state.
, the rod-shaped member 27 to which the detection member 26 is fixed
The normally ON limit switch 22 provided at the lower end of the loom is turned OFF, and the interlock inside the control device 29 connected by the cable 28 stops the rising of the abutment 6, so that the large tool 30 is It is prevented from being caught between the stand 6 and the stage floor surface 4.

(Problem to be Solved by the Invention) In the case where the detection rod 19 is provided as described above, the pillars 17 are provided at the lower four corners of the stage floor surface 4. When placing it on column 17
In addition, since the detection rod 19 is provided, there are problems such as the height of large props 30 etc. to be placed on the abutment stand 6 is restricted. Devices that use photoelectric elements to detect protrusion have problems such as low reliability and difficulty in use because the sensitivity of the photoelectric elements is too high and malfunctions occur frequently.

Furthermore, in the case where a safety device is installed on the lower surface of the stage floor, when viewed from the abyss floor surface 1, the safety device is attached to the ceiling, and the abyss surface for carrying in props 30, etc. There were problems such as not being able to secure a sufficient height above 1, and the safety device sometimes becoming an obstacle when carrying large props 30 and the like.

In view of these points, the present invention eliminates the above-mentioned problems, the protection plate is raised and lowered faster than the raising and lowering of the abutment, and the raising and lowering mechanism of the protection plate is located at a position where it does not interfere with the loading and unloading of large props, etc. The purpose is to provide a safety device that is close to the stage.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a mechanism for moving up and down between an abutment opening on the stage floor and an abutment opening on the abyss floor located below this opening. In a stage abutment equipped with an abutment, a protective plate that can protrude to a predetermined height from the surface of the abutment floor or the abutment is provided on the inner periphery of the abutment opening of the abyss or on the outer periphery of the abutment. In addition, an elevating mechanism is provided on the pit side wall of the abyss or the lower surface of the abutment for raising and lowering the protective plate at a speed faster than the lifting speed of the abutment and holding it at a predetermined height protruding position only while the abutment is moving up and down. It is characterized by having the following.

(Function) According to the present invention, the protective plate provided on the inner periphery of the opening of the abutment on the abutment surface or the outer circumference of the abutment allows the abutment to be flush with the stage floor or the abutment surface. In some cases, the protective plate does not protrude from the stage floor or abyss surface, and the lifting mechanism for the protective plate is installed on the side wall of the abyss table or the bottom of the abutment, so it is difficult to carry large props, etc. to the abutment. , it will not get in the way when being carried out. Moreover, since the protection plate moves up and down from the abyss surface or the abutment at a faster speed than the rising and lowering speed of the abutment, any foot protruding from the abyss surface or the abutment can be quickly detected, and the protection plate This prevents falls from surfaces or abutments.

(Example) The present invention will be described below based on embodiments shown in the drawings.

Note that the same components as the specific example of the prior art described above include:
The description will be given using the same reference numerals.

1 and 2 show a first embodiment of the present invention, in which a rectangular abyss opening 2 is formed in the abyss surface 1, and a pit 3 is formed below the abyss opening 2. It is formed. Further, the abyss opening 2 is provided with a platform 6 that is formed in a rectangular shape slightly smaller than the dimension of the abyss opening 2 and that moves up and down between the abyss opening 2 and a stage opening (not shown).

A support 8 is provided between the abutment 6 and the bottom (not shown) of the shaft 3, and the abutment 6 is connected to the abyss opening 2 and the stage opening by a lifting device (not shown) via the support 8. It is said that it is possible to move up and down freely between the two. Further, a plurality of columnar members 31 are fixed in the vertical direction near the outer peripheral portion of the lower surface of the abutment 6.

Further, a protection plate 9 is provided on the inner circumference of the abyss opening 2 so as to face upward. A space 32 is formed in the side wall of the pit 3 facing the columnar member 31 provided on the abutment 6, and a lifting mechanism 33 for the protection plate 9 is provided in this space 32.

Next, the elevating mechanism 33 will be explained.

A rail 10 extending vertically is provided on the ceiling 34 of the cavity 32, and its lower end is fixed to a rail holding member 35 provided horizontally from the side wall 12 of the cavity 32. The rail 10 is provided with an elevating member 36 that is movable up and down along the rail 10 and an elevating cart 37.

The lower part of the protection plate 9 is fixed to this elevating member 36, and when the protection plate 9 rises to a predetermined height from the abyss floor surface 1, the protection plate 9 comes into contact with the ceiling 34. A stopper 38 is fixed to stop the rise. Further, a movable pulley 39 is rotatably pivotally attached to the elevating cart 37, and an arm member 40 that is pressed against a columnar member 31 provided on the abutment base 6 is fixed in the horizontal direction. Furthermore, a fixed pulley 13 is rotatably pivotally mounted on the ceiling 34 of the cavity 32. A wire rope 14 is suspended over this fixed pulley 13, and this wire rope 14
One end is fixed to the elevating member 36, and the counterweight 15 is fixed to the other end. Further, a rope fixing member 41 is provided on the side wall portion 12 of the space 32, and a movable pulley 3 is provided between the rope fixing member 41 and the elevating member 36.
A wire lobe 42 is passed through the wire 9.

Since the first embodiment is configured as described above, when the abutment 6 is raised from the abyss surface 1 via the pillar 8 by the driving device, the columnar member 31 of the abutment 6 also rises, so that the columnar member 31 The pressing force between the arm member 40 of the elevating cart 37 is released, and the elevating cart 37 becomes able to rise, so the counterweight 15 descends, and as the counterweight 15 descends, the elevating member 36 moves toward the rail. Rise along 10. Therefore, the protection plate 9 provided on the elevating member 36 also rises. Here, a wire lobe 42 is fixed to the elevating member 36, and the elevating cart 37 is connected to the wire lobe 42 via a movable pulley 39.
Since this elevating cart 37 is provided with an arm member 40 that comes into contact with the columnar member 31, this arm member 40 is pulled by the elevating member 36 via the wire lobe 42 as the columnar member 31 rises. Therefore, the arm member 40 rises above the columnar member 31.
It rises while coming into contact with. When the stopper 38 provided on the protection plate 9 hits the ceiling 34 of the cavity 32, the protection plate 9 stops rising, and the protection plate 9 becomes at a predetermined height with respect to the abutment 6. After that, only the platform 6 rises to the stage opening 5.

Further, when the abutment 6 descends, the columnar member 31 provided on the abutment 6 presses the arm member 40 of the elevating cart 37, so the elevating cart 37 descends along the rail 10, and one end of the wire lobe 42 The fixed elevating member 36 also descends along the rail 10, and the protection plate 9 fixed to the elevating member 36 also descends. When the abutment 6 becomes flush with the abyss surface 1, the upper part of the protection plate 9 also becomes flush with the abyss surface 1, and the drive device for the abutment 6 stops.

In addition, in the present invention, since the fixed pulley 13 and the movable pulley 39 are used, as shown in FIGS. Since the lobe 42 moves up and down by 2Lm, the protection plate 9 can be moved up and down faster than the up and down speed of the abutment 6. In this way, the protection plate 9 rises faster than the abutment base 6, so even if the tip of the foot is protruding from the abutment base 6, the abutment base 6
Since the foot is pushed up by the protective plate 9 before the foot is raised, the user's attention is alerted and dangers such as getting the foot caught can be avoided.

5 and 6 show a second embodiment of the present invention, in which a platform 6 is provided between the stage opening 5 and the abyss opening 2, which is raised and lowered by a lifting device (not shown) via a support 8. It is being A plurality of columnar members 31 are fixed in the vertical direction near the outer periphery of the lower surface of the abutment base 6. On the other hand, a winding drum 43 is provided on the bottom surface 7 of the pit 3 below the abyss opening 2.
The winding drum 43 is equipped with a long winding-type protection plate 9 that moves up and down between the abyss opening 2 and the abutment base 6. Further, a cavity 32 is formed in the side wall of the pit 3 facing the columnar member 31 provided on the abutment 6, and a lifting mechanism for the protection plate 9 is provided between the cavity 32 and the lower surface of the stage floor 4. 33 are provided. Note that 44 indicates a guide roller.

Next, the elevating mechanism 33 will be explained.

A rail 10 is vertically provided between a ceiling 34 of the cavity 32 and a rail holding member 35 provided on the bottom surface 7 of the cavity 32. An elevating cart 37 is mounted on the rail 10 so as to be movable up and down along the rail 10. A double-row movable pulley 39 is rotatably pivoted to the elevating cart 37, and an arm member 40 is attached to the elevating cart 37. It protrudes horizontally. When the abutment base 6 is lowered to the extent that it forms the stage opening 5, the lower ends of the columnar members 31 provided on the abutment base 6 come into contact with each other. Further, a double row of fixed pulleys 13 is rotatably mounted on the ceiling of the space 32. On the other hand, two fixed pulleys 13 are pivotally mounted on the lower surface of the stage floor 4 at a predetermined interval. A wire lobe 42 is suspended between the movable pulley 39 and the fixed pulley 13, one end of which is fixed to the ceiling 34 of the cavity 32, and the other end fixed to a stopper provided on the protection plate 9. It is fixed to 45. Also, wire lobe 1 is attached to fixed pulley 13.13.
4 is suspended, one end of which is fixed to a stopper 45 provided on the protection plate 9, and a counterweight 15 is fixed to the other end.

Since the second embodiment is configured as described above, when the abutment 6 is raised from the abyss surface 1 via the pillar 8 by the drive device, the columnar member 31 of the abutment 6 also rises, so that the arm member 40 The pressing force exerted by the columnar member 31 on the column member 31 is released. Therefore, the lifting carriage 37 is moved upward via the wire lobes 14 and 42 due to the gravity of the counterweight 15, and as the wire lobes 14 move upward, the protection plate 9 is lifted via the stops 45.

By combining the movable pulley 39 and the fixed pulley 13 in this manner, the rising speed of the protection plate 9 can be made faster than the rising speed of the lifting cart 37.

After the upper part of the protection plate 9 comes into contact with the lower surface of the stage floor 4, only the abutment platform 6 rises to the stage opening 5.

Further, when the abutment base 6 is lowered to a certain extent, the columnar member 31 provided on the abutment base 6 is moved to the arm member 40 of the elevating trolley 37.
, the lifting carriage 37 descends along the rail 10, the protection plate 9 also descends via the wire lobe 42 and the stopper 45, and the protection plate 9 is wound up on the winding drum 43. Then, when the abutment base 6, the abyss surface 1, and the upper part of the protection plate 9 become flush with each other, the drive device for the abutment base 6 stops.

In this way, a fixed pulley 13.13 is provided on the lower surface of the stage floor 4, and a long winding-type protective plate 9 is fixed to the wire robe 14 that is suspended from the fixed pulley 13.13. The elongated protection plate 9 can be raised to the lower surface of the stage floor 4 at a speed faster than the lifting speed of the platform 6.

In addition, in the above embodiment, an example using a counterweight has been described, but a spring may also be used and the present invention is not limited to this.

FIG. 7 shows a third embodiment of the present invention, in which a hydraulic cylinder is used for the lifting mechanism 33. A hydraulic cylinder 46 and a fixed pulley 13 are provided in the lower space 32 of the abyss floor 1, and the hydraulic cylinder 46 and the fixed pulley 13 are The holding member 4 is attached to the tip of the rod 47 of the cylinder 46.
8 is provided horizontally, and the end of this holding member 48 is fixed to the lower end of the protection plate 9. One end of a wire lobe 14 is fixed to the holding member 48, this wire lobe 14 is suspended over a fixed pulley 13, and a counterweight 15 is fixed to the other end of the wire lobe 14. Further, a hydraulic cylinder 50 is provided on the base 49 below the abutment 6, and when the abutment 6 is lowered to the extent that the abutment 6 is lowered, the lower surface of the abutment 6 is connected to the rod 51 of the hydraulic cylinder 50.
It should be in contact with the And hydraulic cylinder 4
6 and a hydraulic cylinder 50 are connected via piping 52 so as to be interlocked.

That is, in this third embodiment, the cross-sectional area of the hydraulic cylinder 50>the cross-sectional area of the hydraulic cylinder 46.

With this configuration, when the abutment 6 is raised by a drive device (not shown), the rod 51 of the hydraulic cylinder 50 becomes "extended", so that the hydraulic cylinder 46
The rod 47 is "retracted" as the counterweight 15 descends, the protection plate 9 rises, and the stopper 38 comes into contact with the lower part of the abyss surface 1, so the protection plate 9 stops rising.
Only the platform 6 rises to the stage opening. Also, abutment 6
When the rod 51 comes into contact with the rod 51 of the hydraulic cylinder 50 and the rod 51 is "retracted", the rod 47 of the hydraulic cylinder 46 provided on the protection plate 9 becomes "extended" and the protection plate 9 reaches the abyss surface. 1 and the abutment platform 6.

In this case, as described above, the cross-sectional area of the hydraulic cylinder 50>the cross-sectional area of the hydraulic cylinder 46, so the rod 47
The speed of the guard plate 9 is the speed of the rod 51, and the speed of the abutment 6 is the speed of the protective plate 9. Therefore, by making the cross-sectional areas of the two cylinders different, it is possible to easily change the raising and lowering speed of the protection plate 9 relative to the raising and lowering speed of the abutment 6.

Note that although a hydraulic cylinder is used in this explanation, an air cylinder may also be used and the invention is not limited to these.

8 and 9 show a fourth embodiment of the present invention, in which a lever is used in the lifting mechanism 33, in which a rail 10 extending in the vertical direction is erected in a space 32 at the bottom of the abyss surface 1. The lower end of the rail 10 is fixed to a rail holding member 35 provided horizontally from the side wall 12 of the cavity 32. An elevating cart 37 is mounted on the rail 10 so as to be movable up and down along the rail 10, and a protection plate 9 is fixed to the elevating cart 37. Further, a rail 53 is erected below the columnar member 31 provided on the abutment 6 of the rail holding member 35, and an elevating cart 54 that can be raised and lowered along the rail 53 is attached to this rail 53. ing. The lower end surface of the columnar member 31 comes into contact with this elevating cart 54 when the abutment platform 6 is lowered.

Further, a bottle attachment member 55 is vertically provided at the end of the rail holding member 35 on the abutment stand 6 side.

Further, one end of a lever 58 corresponding to approximately the length of the rail holding member 35 is pivotally attached to the pin attachment member 55 via a pin 59 . This lever 58 is attached to the lifting cart 3.
7. A long hole 60 extending in the axial direction at a position corresponding to 54
．． 61 is formed, and the elevating cart 3 is placed in the elongated hole 60.61.
A cam follower 56.57 provided at 7.54 is inserted and engaged.

A spring 62 is provided between the lever 58 on the cavity 32 side and the ceiling 34. Reference numeral 63 is a lever holding member, and when the abutment base 6 is flush with the abyss surface 1, the tip side of the lever 58 comes into contact with the lever holding member 63, the lever 58 becomes almost horizontal, and the protection plate 9 is placed in the abyss. Floor surface 1
It is designed to prevent it from sinking downward.

Since the fourth embodiment is configured in this way, the abutment base 6 is moved to the support column 8 by a drive device (not shown) as shown in FIG.
, the columnar member 31 also rises, and the elevating cart 5
4 is released from being held down by the columnar member 31, the lever 58 is pulled by the spring 62 and lifts the lifting cart 37.54.
move in the respective cam followers 56 and 57 provided in the elongated holes 60 and 61 of the lever 58, and the lever 58 rotates clockwise in the figure about the pin 59. Therefore, the protection plate 9 is moved to the abyss surface 1 via the lifting cart 37.
be raised more.

Further, when the lower end of the columnar member 31 comes into contact with the elevating cart 54 after the abutment 6 is lowered, the elevating cart 54 is pushed down, the lever 58 is rotated counterclockwise, and the cam followers 56 and 57 are moved by the lever 58. As the lifting carriage 37 moves inside the elongated hole 60.61, the protection plate 9 also descends. Then, the lever 58 comes into contact with the lever holding member 63, so that the lever 58 becomes almost horizontal, and the abyss surface 1, the upper part of the abutment 6, and the protection plate 9 become flush with each other.

In addition, if a crimping sensor or the like is provided on the top of the protection plate 9, which is activated when the abutment base 6 is raised, it is possible to detect large tools protruding from the abutment base 6 when the protection plate 9 is raised. By stopping the drive device 6, it is possible to prevent large props and the like from being caught in the stage floor.

10 to 12 show a fifth embodiment of the present invention, in which a protection plate 9 and its elevating mechanism 33 are provided on an abutment 6. FIGS.

The protection plate 9 is held on the outer periphery of the abutment 6 by a guide 64, and an arm member 40 is pivotally attached to the lower part of the arm member 40 with one end thereof substantially perpendicular to the protection plate 9. and,
The arm member 40 is rotatably pivoted approximately at its center by an arm support member 65 fixed to the lower surface of the abutment base 6.

Further, a limit switch 22 provided on the lower surface of the abutment base 6 is provided at the other end of the arm member 40. In addition, the protection plate 9 of the arm member 40 and the arm support member 6
5 and the lower surface of the abutment 6 is a spring 62.
A stopper 66 and a pressing member 67 are provided on the bottom surface 7 of the well 3. stopper 66
When the top surface of the abutment platform 6 and the top of the protection plate 9 are flush with the top surface of the abyss surface 1, the lower end of the protection plate 9 is brought into contact with the stopper 66, and the protection plate 9 is lowered from the abyss surface 1. The pressing member 67 prevents the protection plate 9 from falling down, and when the protection plate 9 is inserted between the abyss surface 1 and the abutment 6, the upper part of the protection plate 9 and the top surface of the abyss surface 1 and the abutment 6 are connected. The arm member 40 is tilted so that the two sides are on the same plane, and the limit switch 22 is operated at the end of the arm member 40.

Since the fifth embodiment is configured in this way, the abutment 6 is moved to the support column 8 by a lifting device (not shown) as shown in FIG.
When the arm member 40 is raised through the pressing member 6
The protective plate 9 is released from the upper surface of the abutment base 6 and becomes approximately horizontal due to the tension of the spring 62. Then, since the connection between the arm member 40 and the limit switch 22 is turned off, the abutment base 6 continues to rise.

Then, as shown in FIG. 12, when the upper part of the protection plate 9 comes into contact with the lower surface of the stage floor 1, the protection plate 9 is lowered, the arm member 40 is tilted, the limit switch 22 is turned on, and the approach platform 6 is raised. stops. Further, as shown in FIG. 10, when the abutment platform 6 descends and becomes flush with the abyss surface 1, the arm member 40 contacts the stopper 66 and the pressing member 67 and tilts, so the limit switch 22 is turned on. The descent of the abutment platform 6 is stopped. Also, while the abutment platform 6 is being raised and lowered, the
As shown in Figure 1, the protective plate 9 protrudes from the abutment base 6 at a predetermined height, but when, for example, a plate or the like comes into contact with the upper part of the protective plate 9, the protective plate 9 lowers and the arm member 40 tilts, causing the limit. The switch 22 is turned on, and the elevation of the approaching platform 6 is stopped midway.

By doing this, even if the abutment stand 6 rises slightly above the abyss floor surface 1, it is possible to detect the protrusion of large props etc. from the abutment stand 6 and stop the abutment stand 6.
Since there are no obstacles between the stage floor surface 4 and the abyss floor surface 1, large props 30 and the like can be carried into and out of the abutment platform 6 without any hindrance.

Nao, the limit switch 22 is turned to O by the arm member 40.
When the position becomes N, the raising and lowering of the abutment base 6 is stopped, but the abutment base 6 can be raised and lowered from this state by using another switch (not shown).

13 to 15 show a sixth embodiment of the present invention, which is provided with a protection plate 9 and a lifting handrail 68.

The protection plate 9 is provided on the outer periphery of the abutment base 6, and one end of an inverted V-shaped arm member 40 is pivotally attached to the lower part of the protection plate 9.

The arm member 40 has an inverted V-shaped apex that approaches the abutment 6.
The arm member 40 is pivotally connected to an arm support member 65 provided on the lower surface of the arm member 40, and a counterweight 15 is fixed to the other end of the arm member 40. Further, a pressing member 67 is provided at a position corresponding to the counterweight 15 on the bottom surface 7 of the pit 3.

On the other hand, the lift handrail 68 is provided on the inner circumference of the abyss opening 2, and the lift mechanism 33 includes a lift handrail holding member 69,
A fixed pulley 13, a wire lobe 14 and a counterweight 15 are provided.

The fixed pulley 13 is rotatably connected to the lifting handrail holding member 69, one end of the wire lobe 14 is fixed to the lifting handrail 68, and the other end of the wire lobe 14, which is suspended from the fixed pulley 13, has a counter weight. 15 is fixed. A receiver member 70 is provided at the lower part of the elevator handrail 68, with which the lower part of the protection plate 9 comes into contact. Further, a stopper 66 is provided on the bottom surface 7 of the pit 3 directly below the lifting handrail 68.

Since the sixth embodiment is configured in this manner, when the abyss surface 1 and the upper surface of the abutment platform 6 are on the same plane as shown in FIG. It comes into contact with the lower part of the protection plate 9 and is pushed down, and the lifting handrail 6
A stopper 6 whose lower part is provided on the bottom surface 7 of the pit 3
6, the upper part of the lifting handrail 68 becomes flush with the abyss floor surface 1. On the other hand, the lower part of the protection plate 9 contacts the member 70 of the lifting handrail 68, and the counterweight 1
5 comes into contact with the pressing member 67, so that the upper part of the protection plate 9 is flush with the abyss surface 1. Then, when the abutment base 6 rises, the counterweight 15 of the protection plate 9 separates from the pressing member 67, so the counterweight 15 lowers, and therefore the protection plate 9 rises above the abutment base 6. Then, as shown in FIG. 15, when the abutment 6 rises and becomes flush with the stage floor 4, the upper part of the protection plate 9 comes into contact with the lower part of the stage floor 4, so that the protection plate 9 is lower than the stage floor 4. Nothing stands out. On the other hand, when the sliding handrail M6B starts to rise and the lower part of the protection plate 9 separates from the support member 70, the counterweight 15 lowers, so that the sliding handrail 68 is suspended from the fixed pulley 13. It is pulled up by the wire lobe 14 and protrudes from the abyss surface 1, so the shaft 3
This prevents the user from falling off the platform 6 and from protruding his/her feet from the platform 6.

In the above embodiments, the elevating mechanism has been described as using a pulley and a counterweight, a cylinder, a pulley and a counterweight, and a lever and a spring. However, link mechanisms, mechanisms that replace linear motion with rotational motion, and gears may also be used. It is also possible to use a mechanism that changes the number of rotations and replaces it with linear motion, and is not limited to these.

〔Effect of the invention〕

As explained above, the present invention provides a stage abutment that is equipped with an abutment that moves up and down between the abutment opening in the stage floor and the abutment opening in the abyss located below this opening. A protective plate that can protrude to a predetermined height from the surface of the abutment surface or abutment is provided on the inner circumference of the abutment opening on the floor surface or on the outer circumference of the abutment, and a protection plate that can protrude from the abutment surface or the surface of the abutment by a predetermined height is provided. An elevating mechanism is provided on the lower surface of the abutment that raises and lowers the protection plate at a faster speed than the elevating speed of the abutment and holds it at a predetermined height protruding position only while the abutment is moving up and down, so that the abutment does not fall into the abyss. Not only can the entire surface of the abyss floor or stage floor be used when it is on the same level as the floor or stage floor, but also when carrying props, etc. into or out of the abyss floor or stage floor. Since there are no obstacles, these tasks can be carried out without any problems. Furthermore, while the abutment is being raised, the protection plate is raised at a faster speed than the abutment, so parts protruding from the abutment can be quickly detected and safety is ensured. and,
Since these can be carried out by an extremely simple mechanism, an inexpensive safety device can be provided.

[Brief explanation of drawings]

1 to 4 show a first embodiment of the safety device for approaching the stage according to the present invention, FIG. 1 is a longitudinal sectional view when the abutment is located on the same plane as the abyss floor, and FIG. A vertical cross-sectional view when the abutment is raised, FIGS. 3 and 4 are illustrations of raising and lowering the protection plate, FIGS. 5 and 6 show a second embodiment of the present invention, and FIG. 5 is a view of the abutment Figure 6 is a vertical cross-sectional view when the abutment is located on the same plane as the abyss floor, and Figure 6 is a vertical cross-sectional view when the abutment is raised.
FIG. 7 is a longitudinal cross-sectional view showing a third embodiment of the present invention when the abutment is located on the same plane as the abyss surface, and FIGS. 8 and 9 show a fourth embodiment of the present invention. Figure 8 is a vertical cross-sectional view when the abutment is located on the same plane as the abyss floor, the ninth factor is a vertical cross-sectional view when the abutment is raised, and Figures 10 to 12 are the fifth embodiment of the present invention. For example, Figure 10 is a vertical cross-sectional view when the abutment is located on the same plane as the abyss floor, Figure 11 is a vertical cross-sectional view when the abutment is raised, and Figure 12 is a vertical cross-sectional view when the abutment is located on the stage floor. 13 to 15 show the sixth embodiment of the present invention, and FIG. 13 is a longitudinal section when the abutment is located on the same plane as the abyss surface. Front view, No. 14
The figure is a vertical cross-sectional view when the abutment is raised, Figure 15 is a vertical cross-sectional view when the abutment is located on the same plane as the stage floor,
Figures 6 to 19 show the first prior art of the conventional safety device for approaching the stage, Figure 16 is a longitudinal cross-sectional view when the abutment is located on the same plane as the abyss floor, and Figure 17 is a vertical sectional view of the abutment. Fig. 18 is a vertical cross-sectional view when the
A-A celebration view in the figure, Figure 19 is a partial perspective view of the protection plate,
Fig. 20 to Fig. 22 show the second conventional technique, Fig. 20 is a longitudinal sectional view, Fig. 21 is a transverse sectional view, Fig. 22 is a detailed view of the detection rod attachment part, and Fig. 23 is a third conventional technique. FIG. 1... Abyss floor surface, 3... Pit, 4... Stage floor surface, 6
...Abutment, 9...Protection plate, 13...Fixed pulley, 3
3... Lifting mechanism, 39... Moving pulley. Applicant's agent Mr. Sato Figure 2 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 13 Figure 14 Figure 15 Figure 16 Figure 17 Figure 19 Figure 20 Figure 21

Claims (1)

[Claims] In a stage abutment equipped with an abutment that moves up and down between the abutment opening on the stage floor and the abutment opening on the abyss located below this opening, the inside of the abutment opening on the abyss A protective plate that can protrude to a predetermined height from the abyss surface or the surface of the abutment is provided on the periphery or the outer periphery of the abutment, and
An elevating mechanism is provided on the pit side wall of the abyss or on the lower surface of the abutment for raising and lowering the protective plate at a faster speed than the elevating speed of the abutment and holding it at a predetermined height protruding position only while the abutment is moving up and down. A safety device that is close to the stage.