JP2019001630A - Fall prevention device, fall preventing unit and lifting device - Google Patents

Abstract

To provide a fall prevention device, a fall prevention unit, and a lifting device including a fall prevention device that can realize size reduction, weight reduction, or cost reduction.SOLUTION: The fall prevention device includes: a first structure body 3 and a second structure body 4 that are fixed to the belt 2; a first stopper which is disposed on one side in the extending direction of the belt 2 with respect to the first structure body 3, and can stop the movement of the first structure 3 toward one side; and a second stopper which is disposed on the other side in the extending direction of the belt 2 with respect to the second structure 4 and which can stop the movement of the second structure 4 toward the other side.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an elevating apparatus comprising at least one elevating member that is lifted and lowered when the linear body is wound or sent out, and a fall prevention device that prevents the elevating member from falling when the linear body breaks, The present invention relates to a fall prevention unit and a lifting device.

  2. Description of the Related Art Conventionally, there is a lifting device that lifts and lowers a lifting member such as a cylinder by winding or feeding a linear body such as a belt. In such an elevating device, when the elevating member is at a position higher than the lowest point, the position of the elevating member is held by a belt to which tension is applied. Therefore, when the belt is broken and the tension is released, the elevating member falls. Conventionally, a fall prevention device for preventing the elevating member from dropping due to such a belt breakage is known.

  The conventional fall prevention device includes an auxiliary belt for preventing fall at the time of breakage and a holding mechanism for holding the auxiliary belt in addition to the main belt for raising and lowering. In the fall prevention device, when the main belt is broken, the holding mechanism is operated to hold the auxiliary belt and prevent the elevating device from falling (see, for example, JP-A-9-301651).

JP-A-9-301651

  However, since the conventional fall prevention device includes an auxiliary belt that is not used during the raising / lowering operation, there is a problem that it is difficult to realize a reduction in size, weight, or cost.

  A main object of the present invention is to provide a fall prevention device, a fall prevention unit, and a lifting device including the fall prevention device that can be reduced in size, weight, and cost.

  The fall prevention device according to the present invention is installed in a lifting device including a linear body and at least one lifting member that is lifted or lowered by winding or feeding the linear body, and at least 1 when the linear body breaks. It is a fall prevention device which prevents fall of two raising / lowering members. The fall prevention device is arranged on one side of at least one structure fixed to the linear body, and at least one structure in the extending direction of the linear body, and on one side of the at least one structural body A first stopper that can stop the movement of the linear body, and a second stopper that is arranged on the other side in the extending direction of the linear body with respect to the at least one structure and can stop the movement of the structure to the other side. Prepare.

  According to the present invention, there is no need for an auxiliary belt that is not used during the lifting and lowering operation, and thus there is provided a fall prevention device, a fall prevention unit, and a lifting device including the fall prevention device that can be reduced in size, weight, or cost. can do.

1 is a perspective view showing an elevating device according to Embodiment 1. FIG. It is sectional drawing seen from the line segment II-II in FIG. It is a figure which shows the fall prevention apparatus fixed to the raising / lowering apparatus which concerns on Embodiment 1. FIG. It is an exploded view which shows the structure which fixes a fall prevention apparatus to the raising / lowering apparatus which concerns on Embodiment 1. FIG. FIG. 6 is a diagram for explaining the operation of the lifting device according to the first embodiment. FIG. 6 is a diagram for explaining the operation of the lifting device according to the first embodiment. It is a figure for demonstrating the state of the fall prevention apparatus when a belt is normal in the raising / lowering apparatus which concerns on Embodiment 1. FIG. It is a figure for demonstrating the state of the fall prevention apparatus when a belt fractures | ruptures in the raising / lowering apparatus which concerns on Embodiment 1. FIG. It is a figure which shows the fall prevention apparatus which concerns on Embodiment 2. FIG. It is a figure which shows the fall prevention apparatus which concerns on Embodiment 3. FIG. It is a figure which shows the modification of the fall prevention apparatus which concerns on Embodiment 1. FIG. It is a figure which shows the other modification of the fall prevention apparatus which concerns on Embodiment 1. FIG. It is a figure which shows the further another modification of the fall prevention apparatus which concerns on Embodiment 1. FIG. It is a figure which shows the modification of the fall prevention apparatus which concerns on Embodiment 2. FIG. It is a figure which shows the modification of the fall prevention apparatus which concerns on Embodiment 3. FIG.

  Embodiments of the present invention will be described below with reference to the drawings. In the following drawings, the same or corresponding parts are denoted by the same reference numerals, and description thereof will not be repeated.

Embodiment 1 FIG.
<Configuration of lifting device>
1 and 2 are diagrams illustrating an example of a lifting device to which the fall prevention device 1A according to the present embodiment is applied. As shown in FIGS. 1 and 2, the lifting device 100 includes a fall prevention device 1 </ b> A, a belt 2, a plurality of cylinders, a plurality of rollers, and a plurality of driving units. Details of the fall prevention device 1A will be described later. In the example shown in FIG. 1 and FIG. For convenience of explanation, the center side of the plurality of cylinders in the horizontal direction is referred to as the inner side.

  The plurality of cylinders include, for example, a first cylinder 20, a second cylinder 21, a third cylinder 22, and a fourth cylinder 23 from above. The first cylinder to the fourth cylinder are examples of the lifting member. The first cylinder to the fourth cylinder have a hollow portion and are arranged in a nested manner. The first cylinder 20 as the first lifting member is disposed in the second cylinder 21, the second cylinder 21 is disposed in the third cylinder 22, the third cylinder 22 is disposed in the fourth cylinder 23, and The cylinder 23 is disposed in a base cylinder 24 that is not raised or lowered. The first cylinder 20 is disposed on the innermost side among the first to fourth cylinders, and is disposed on the uppermost side (tip). The fall prevention device 1 </ b> A is fixed inside the first cylinder 20. Note that the lifting device 100 only needs to include at least one lifting member.

  A plurality of rollers are fixed to each top and bottom of each of the plurality of cylinders. On the top of the first cylinder 20, rollers 8 and 9 constituting a fall prevention device 1 </ b> A, which will be described later, are fixed with a gap in the horizontal direction. Two rollers 30 are fixed to the bottom of the first cylinder 20 so as to face each other in the horizontal direction. The two rollers 30 are disposed below rollers 8, 9 described later. The two rollers 30 are disposed outside, for example, rollers 8 and 9 described later. The rollers 8 and 9 are for folding the belt 2 inside the first cylinder 20. Each roller 30 is for passing the belt 2 between the inside of the first cylinder 20 and the outside of the first cylinder 20 and the inside of the second cylinder 21.

  As shown in FIG. 3, the first cylinder 20 has a holding portion 25 for holding the fall prevention device 1A at its top. The holding portion 25 is provided with an opening portion 26 for inserting and removing the fall prevention device 1A. The opening 26 communicates with a hollow portion inside the first cylinder 20.

  Two rollers 31 are fixed to the top of the second cylinder 21 at a distance from each other in the horizontal direction. Two rollers 32 are fixed to the bottom of the second cylinder 21 at intervals in the horizontal direction. Each roller 31 is for folding the belt 2 inside the second cylinder 21. Each roller 32 is for passing the belt 2 between the inside of the second cylinder 21 and the outside of the second cylinder 21 and the inside of the third cylinder 22.

  Two rollers 33 are fixed to the top of the third cylinder 22 at a distance from each other in the horizontal direction. Two rollers 34 are fixed to the bottom of the third cylinder 22 at a distance from each other in the horizontal direction. Each roller 33 is for folding the belt 2 inside the third cylinder 22. Each roller 34 is for passing the belt 2 between the inside of the third cylinder 22 and the outside of the third cylinder 22 and the inside of the fourth cylinder 23.

  Two rollers 35 are fixed to the top of the fourth cylinder 23 at intervals in the horizontal direction. Two rollers 36 are fixed to the bottom of the fourth cylinder 23 at a distance from each other in the horizontal direction. Each roller 35 is for folding the belt 2 inside the fourth cylinder 23. Each roller 36 is for passing the belt 2 between the inside of the fourth cylinder 23 and the outside of the fourth cylinder 23 and the inside of the base cylinder 24.

  Similarly, two rollers 37 are fixed to the top of the base cylinder 24 at a distance from each other in the horizontal direction. Each roller 37 is for folding the belt 2 inside the base cylinder 24.

  Further, two rollers 38 are fixed to the bottom of the first cylinder 20 above the two rollers 30. Each roller 38 is for adjusting the position of the belt 2 with respect to the first cylinder 20.

  Further, two rollers 39 are fixed to the top of the second cylinder 21 below the two rollers 31. Two rollers 40 are fixed to the bottom of the second cylinder 21 above the two rollers 32. The roller 39 and the roller 40 are for adjusting the position of the belt 2 with respect to the second cylinder 21.

  Further, two rollers 41 are fixed to the top of the third cylinder 22 below the two rollers 33. Two rollers 42 are fixed to the bottom of the third cylinder 22 above the two rollers 34. The rollers 41 and 42 are for adjusting the position of the belt 2 with respect to the third cylinder 22.

  Further, two rollers 43 are fixed to the top of the fourth cylinder 23 below the two rollers 35. Two rollers 44 are fixed to the bottom of the fourth cylinder 23 above the two rollers 36. The rollers 43 and 44 are for adjusting the position of the belt 2 with respect to the fourth cylinder 23. Further, two rollers 45 are fixed to the top of the base cylinder 24 below the two rollers 37.

  The belt 2 is passed to each roller. The belt 2 is folded back by the rollers 8 and 9 of the fall prevention device 1 fixed inside the first cylinder 20. A portion of the belt 2 that is positioned closer to the first drive unit 50 than a portion that is passed to the roller 8 is passed to one of the rollers 30 to 45. A portion of the belt 2 that is positioned closer to the second drive unit 51 than a portion that is passed to the roller 9 is passed to the other rollers 30 to 45. In the following, the part of the belt 2 that is passed to the roller 5 side of the first stopper from the part of the folding member that is passed to the roller 8 is called one end side of the belt 2, and is passed to the roller 9 in the belt 2. The portion that is passed to the roller 7 side than the portion that is present is called the other end side of the belt 2.

The plurality of drive units include a first drive unit 50 and a second drive unit 51. The first drive unit 50 winds or sends out the one end side of the belt 2. The second drive unit 51 winds or sends out the other end side of the belt 2. The first driving unit 50 and the second driving unit 51 are configured such that the winding amount or the sending amount of one end side of the belt 2 by the first driving unit 50 is equal to the winding amount of the other end side of the belt 2 by the second driving unit 51 or It is controlled to be equal to the delivery amount. As a result, the belt 2 disposed in the first cylinder 20 maintains a relative positional relationship with respect to the first cylinder 20. The first drive unit 50 and the second drive unit 51 are disposed, for example, outside a plurality of cylinders.
<Configuration of fall prevention device>

  As shown in FIGS. 3 and 4, the fall prevention device 1 </ b> A includes a first structure 3, a second structure 4, a first stopper, a second stopper, a folding member, and a pedestal 10.

  The first stopper includes a roller 5 and a block 6. The second stopper includes a roller 7 and a block 6. The folding member includes a roller 8 and a roller 9. The roller 5, the block 6, the roller 7, the roller 8, and the roller 9 are fixed to the base 10. The first stopper and the second stopper are arranged symmetrically with respect to the center line of the first cylinder 20 extending in the vertical direction. The first stopper is disposed at a distance from the second stopper in the horizontal direction.

  The roller 5 is disposed below the roller 8 and spaced from the roller 8. The roller 7 is disposed below the roller 9 and spaced from the roller 9. The roller 5 is disposed at a distance from the roller 7 in the horizontal direction. The roller 8 is disposed at a distance from the roller 9 in the horizontal direction. For example, the roller 5, the roller 7, the roller 8, and the roller 9 are disposed on the inner side of the roller 30. The roller 5 has a configuration equivalent to, for example, the roller 7. The roller 8 has the same configuration as the roller 9.

  The roller 5 and the roller 7 are disposed so as to face each other with the block 6 interposed therebetween. The roller 5 is disposed at a distance from the block 6 in the horizontal direction. The roller 7 is arranged at a distance from the block 6 in the horizontal direction. The gap between the roller 5 and the block 6 is disposed inside the outermost peripheral surface of the roller 8 in the horizontal direction. The gap between the roller 7 and the block 6 is disposed inside the outermost peripheral surface of the roller 9 in the horizontal direction.

  In the first cylinder 20, the belt 2 is passed to rollers 5, 7 to 9 of the fall prevention device 1 </ b> A in addition to the roller 30. The belt 2 passed between the two rollers 30 shown in FIG. 2 is folded back by the rollers 8 and 9. The belt 2 passed between the roller 8 and one roller 30 is passed between the roller 5 and the block 6. The belt 2 passed between the roller 8 and the other roller 30 is passed between the roller 7 and the block 6.

  The belt 2 passed between the two rollers 30 in the first cylinder 20 is bent by the rollers 8 and 9 to form an acute angle. Further, the belt 2 passed between the roller 8 and the roller 30 is bent by the roller 5 so as to form an obtuse angle. The belt 2 passed between the roller 9 and the roller 30 is bent by the roller 7 so as to form an obtuse angle.

  Hereinafter, a portion of the belt 2 that is passed between the roller 5 and the roller 8 is referred to as a first portion, and a direction in which the first portion extends is referred to as a first direction. A portion of the belt 2 that is passed between the roller 7 and the roller 9 is referred to as a second portion, and an extending direction of the second portion is referred to as a second direction. The first direction intersects the second direction. The first direction and the second direction intersect with the horizontal direction. A direction orthogonal to the first direction and the second direction in the horizontal direction is defined as a third direction. The rotation shafts of the rollers 5, 7, 8, and 9 extend along the third direction. The length of the cross section perpendicular to the extending direction of the belt 2 extends along the third direction.

  The first structure 3 and the second structure 4 are fixed to the belt 2. The first structure 3 is fixed to the first portion of the belt 2 that is passed between the roller 5 and the block 6 and the roller 8. The 1st structure 3 is being fixed to the center part of the said 1st part, for example. The second structure 4 is fixed to the roller 7 and the second portion of the belt 2 passed between the block 6 and the roller 9. The 2nd structure 4 is being fixed to the center part of the said 2nd part, for example. Preferably, the 1st structure 3 is being fixed to the middle of the roller 8 and the roller 5, for example in the said 1st part. Preferably, the 2nd structure 4 is being fixed to the part close | similar to the middle of the roller 9 and the roller 7 in the said 2nd part, for example. Preferably, the distance between the first structure 3 and the roller 5 in the first direction is equal to the distance between the second structure 4 and the roller 9 in the second direction. Preferably, the distance between the second structure 4 and the roller 7 in the second direction is equal to the distance between the first structure 3 and the roller 8 in the first direction. The widths of the first structure 3 and the second structure 4 in the short direction of the cross section perpendicular to the extending direction of the belt 2 exceed the short length (thickness) of the belt 2. The width of the first structure 3 and the second structure 4 in the third direction may be equal to or less than the length (width) of the belt 2 in the longitudinal direction.

  In other words, the first structure 3 is fixed to the belt 2 located closer to the first drive unit 50 than the second structure 4, and the second structure 4 is more stable than the first structure 3. It is fixed to the belt 2 located on the second drive unit 51 side. The first structure 3 and the second structure 4 may be fixed by any method including adhesion and tightening, but are preferably screwed.

  In the direction intersecting the first direction, the distance between the roller 5 and the block 6 is not less than the width of the belt 2 and less than the width of the first structure 3. In the direction intersecting the second direction, the distance between the roller 7 and the block 6 is not less than the width of the belt 2 and less than the width of the second structure 4.

  The first structure 3 supports the total weight of the first cylinder 20 to the fourth cylinder 23 when a part of the belt 2 located between the first structure 3 and the second drive unit 51 is broken. The belt 2 is fixed to the belt 2 so that the tension (the first state) applied to the belt 2 positioned between the first structure 3 and the first driving unit 50 can be maintained. The second structure 4 supports the total weight of the first cylinder 20 to the fourth cylinder 23 when a part of the belt 2 located between the second structure 4 and the first drive unit 50 breaks. The belt 2 is fixed to the belt 2 so that the obtained tension can be maintained (second state) applied to the belt 2 positioned between the second structure 4 and the second drive unit 51.

  The fall prevention device 1 </ b> A is provided so that the state in which the first structure 3 is in contact with the roller 5 and the block 6 is maintained in the first state. Similarly, the fall prevention device 1 </ b> A is provided so that the state in which the second structure 4 is in contact with the roller 7 and the block 6 is maintained in the second state.

  The fall prevention device 1 </ b> A is detachably attached to the first cylinder 20. The maximum horizontal width of the fall prevention device 1 </ b> A is smaller than the inner diameter of the opening 26 of the holding unit 25. The pedestal 10 of the fall prevention device 1 </ b> A is provided so as to be switchable between a state held by the holding unit 25 and a state removed from the holding unit 25. The pedestal 10 is fixed to the holding portion 25 with screws, for example. The opening part 26 of the holding part 25 is closed by a lid part 27. The lid portion 27 is provided so as to be detachable from the holding portion 25. The lid part 27 is fixed to the holding part 25 with screws, for example.

The fall prevention device 1A can be attached to and detached from the lifting device 100 simultaneously with the belt 2 to which the first structure 3 and the second structure 4 are fixed. In other words, the fall prevention unit 101 (see FIG. 4) including the fall prevention device 1A and the belt 2 to which the first structure 3 and the second structure 4 are fixed is attached to the lifting device 100; The state of being removed from the lifting device 100 can be switched.
<Operation of lifting device>

  FIG. 5 is a view for explaining the lifting operation when the first cylinder 20 is lifted and lowered with respect to the second cylinder 21. In FIG. 5, the roller 31 is located at the lowest position within a range in which the roller 31 can move, or is in a state in which the downward movement is restricted. As shown in FIG. 5, one end side of the belt 2 folded inside the first cylinder 20 is wound up in the direction of arrow A in FIG. 5 by the first drive unit 50, and the other end side of the belt 2 is By being wound in the direction of arrow B in FIG. 5 by the second drive unit 51, the first cylinder 20 rises so as to narrow the interval between the roller 30 and the roller 31. At this time, the amount of winding of the belt 2 by the first driving unit 50 is equal to the amount of winding of the belt 2 by the second driving unit 51, so that the belt 2 passed between the two rollers 30 is 1 cylinder 20 is stopped.

  Further, one end side of the belt 2 folded inside the first cylinder 20 is sent out by the first drive unit 50, and the other end side of the belt 2 is sent out by the second drive unit 51, whereby the first cylinder 20. Descends to widen the gap between the roller 30 and the roller 31. At this time, the feed amount of the belt 2 by the first drive unit 50 is equal to the feed amount of the belt 2 by the second drive unit 51, so that the belt 2 passed between the two rollers 30 is in the first cylinder. 20 is stopped. In other words, the winding amount and the sending amount by the first driving unit 50 are controlled to be equal to the winding amount and the sending amount by the second driving unit 51, so that the first structure 3 and the first structure 3 can The two-structure body 4 is stopped with respect to the roller 5, the block 6, and the rollers 7-9.

  FIG. 6 is a view for explaining the lifting operation including the second cylinder 21 in addition to the first cylinder 20. The lifting operation shown in FIG. 6 can be performed basically in the same manner as the lifting operation shown in FIG. That is, also in the raising / lowering operation shown in FIG. 6, the first structure 3 is controlled by controlling the winding amount and the feeding amount by the first driving unit 50 to be equal to the winding amount and the feeding amount by the second driving unit 51. And the 2nd structure 4 has stopped with respect to the roller 5, the block 6, and the rollers 7-9.

  Note that the lifting operation when the third cylinder 22 is further considered can be performed in the same manner as the lifting operation shown in FIGS.

Moreover, in the raising / lowering apparatus 100 shown by FIGS. 1-5, a 1st cylinder-a 4th cylinder are raised / lowered simultaneously. For example, when the belt 2 is wound up by the first drive unit 50 and the second drive unit 51, the interval between the roller 30 and the roller 31, the interval between the roller 32 and the roller 33, and the roller 34 and the roller 35. The first cylinder 20 is relative to the second cylinder 21, the second cylinder 21 is relative to the third cylinder 22, and the third cylinder 22 is relative to the fourth cylinder 23. The fourth cylinder 23 is raised with respect to the base cylinder 24, respectively.
<Operation of the fall prevention device>

  FIG. 7 is a diagram illustrating the fall prevention device 1A in a normal state in which the belt 2 is not broken. As described above, in the lifting / lowering operation of the lifting / lowering device 100, the roller 5 is made equal by equalizing the winding amount and the feeding amount on one end side and the other end side of the belt 2 folded by the rollers 8 and 9 of the fall prevention device 1A. The relative positional relationship of the first structure 3 and the second structure 4 with respect to the block 6 and the rollers 7 to 9 is maintained.

  FIG. 8 is a view showing the fall prevention device 1A in a state where the belt 2 passed between the first structure 3 and the second drive unit 51 is broken. As shown in FIG. 8, for example, when the belt 2 passed between the first structure 3 and the second drive unit 51 breaks in a state where at least the first cylinder 20 is raised from its lowest point, The tension applied between the belts 2 passed between the first drive unit 50 and the second drive unit 51 starting from the broken portion is released. As a result, the portion of the belt 2 that is located closer to the first drive unit 50 than the breakage point moves away from the breakage point, and the first structure 3 comes into contact with the roller 5 and the block 6 as the first stopper. Thereby, tension is applied to the belt 2 passed between the first structure 3 and the first drive unit 50.

  As described above, the first structure 3 has the tension that can support the total weight of the first cylinder 20 to the fourth cylinder 23 on the belt 2 positioned between the first structure 3 and the first drive unit 50. The belt is fixed to the belt 2 so that the applied first state can be maintained. Therefore, when the belt 2 passed between the first structure 3 and the second drive unit 51 is broken, the first structure 3 is in a state of being fixed to the belt 2 while being in contact with the roller 5 and the block 6. Maintained. At this time, the total weight of the belt 2 passed between the first structure 3 and the first drive unit 50 that is higher than the lowest point at the time of the breakage of the first to fourth cylinders. A tension capable of supporting is applied. As a result, the fall prevention device 1A stops the fall of the first to fourth cylinders that were raised from the lowest point at the time of the break.

  Similarly, when the belt 2 passed between the second structure 4 and the first drive unit 50 breaks, the fall prevention device 1A has the respective first to fourth cylinders at the time of the breakage. You can stop the fall of what was above the lower point. Specifically, when the belt 2 passed between the second structure 4 and the first drive unit 50 breaks in a state where at least the first cylinder 20 is raised from its lowest point, The tension applied between the belts 2 passed between the first drive unit 50 and the second drive unit 51 at the starting point is released. As a result, the portion of the belt 2 that is located closer to the second drive unit 51 than the breakage point moves away from the breakage point, and the second structure 4 comes into contact with the roller 7 and the block 6 as the second stopper. Thereby, a tension is applied to the belt 2 passed between the second structure 4 and the second drive unit 51.

As described above, in the second structure 4, the tension that can support the total weight of the first cylinder 20 to the fourth cylinder 23 is applied to the belt 2 positioned between the second structure 4 and the second drive unit 51. It is fixed to the belt 2 so as to maintain the applied second state. Therefore, when the belt 2 passed between the second structure 4 and the first driving unit 50 is broken, the second structure 4 is in a state of being fixed to the belt 2 while being in contact with the roller 7 and the block 6. Maintained. At this time, the total weight of the belt 2 passed between the second structure 4 and the second drive unit 51 that is higher than the lowest point at the time of the breakage of the first to fourth cylinders. A tension capable of supporting is applied. As a result, the fall prevention device 1A stops the fall of the first to fourth cylinders that were raised from the lowest point at the time of the break.
<Effect>

  As described above, the fall prevention device 1A according to the first embodiment includes the first structure 3 and the second structure 4 that are fixed to the belt 2, and the extending direction of the belt 2 with respect to the first structure 3. The roller 5 and the block 6 as a first stopper which can be disposed on one side of the first structure 3 and can stop the movement of the first structure 3 to the one side, and the other side in the extending direction of the belt 2 with respect to the second structure 4 And a roller 7 and a block 6 as a second stopper that can stop the movement of the second structure 4 to the other side.

  As described above, the fall prevention device 1A is fixed to the first structure 3 and the first structure 3 when the belt 2 passed between the first structure 3 and the second drive unit 51 breaks. Further, the movement of the belt 2 to the one side can be stopped. The fall prevention device 1A stops the fall of the first to fourth cylinders that have risen from the lowest point at the time of breakage. Furthermore, the fall prevention device 1A is fixed to the second structure 4 and the second structure 4 when the belt 2 passed between the second structure 4 and the first drive unit 50 breaks as described above. Further, the movement of the belt 2 toward the other side can be stopped. Therefore, according to the fall prevention device 1A, it is possible to stop the fall of the first cylinder to the fourth cylinder that has risen from the lowest point at the time of breakage, regardless of the breakage point in the belt 2.

  Such a fall prevention action of the fall prevention device 1A includes the first structure 3 and the second structure 4 fixed to the belt 2 that realizes the raising and lowering operation of the lifting device 100, the first stopper and the second stopper, It is realized by. Therefore, the fall prevention device 1A does not require an auxiliary belt that is essential in the conventional fall prevention device, and the fall prevention device 1A is at least one of a size reduction, weight reduction, and cost reduction compared to the conventional fall prevention device. Can be realized.

  In the lifting device 100, a part of the belt 2 is passed into the first to fourth cylinders. In the lifting device 100, the first structure 3 and the second structure 4 are fixed to a part of the belt 2. That is, the fall prevention device 1 </ b> A is fixed inside the first cylinder 20. In such a lifting device 100, the risk of breakage of the belt 2 is reduced as compared with the case where the belt 2 is passed outside the first to fourth cylinders. Furthermore, the fall prevention device 1A can be attached to the lifting device 100 without changing the location of the belt 2 in the lifting device 100.

  In the fall prevention device 1A, the first structure 3 and the second structure 4 are provided so that the state fixed to the belt 2 is maintained even when the first structure 3 and the second structure 4 are in contact with the first stopper or the second stopper. ing.

  Therefore, when the belt 2 passed between the first structure 3 and the second drive unit 51 breaks, the fall prevention device 1A is configured such that the first structure 3 and the one of the belts 2 fixed to the first structure 3 are separated from each other. The movement to the side can be stopped. Further, when the belt 2 passed between the second structure 4 and the first drive unit 50 breaks, the fall prevention device 1A is configured so that the second structure 4 and the other side of the belt 2 fixed to the second structure 4 are separated. You can stop moving to.

  In the fall prevention device 1A, the first structure 3 and the second structure 4 are fixed to the belt 2 with screws. If it does in this way, the state where the 1st structure 3 and the 2nd structure 4 were fixed to belt 2 will be maintained also when contacting the 1st stopper or the 2nd stopper.

  1 A of said fall prevention apparatuses are further provided with the roller 8 and the roller 9 as a folding member which folds the belt 2 and makes the extending direction of the belt 2 the 1st direction and the 2nd direction. The roller 5 and the block 6 are spaced apart from the roller 8 in the first direction. The roller 7 and the block 6 are spaced apart from the roller 9 in the second direction. The first structure 3 is fixed to the belt 2 that is passed between the roller 8 and the roller 5. The second structure 4 is fixed to the belt 2 that is passed between the roller 9 and the roller 7.

  In this manner, the winding amount and the sending amount of the first driving unit 50 are controlled to be equal to the winding amount and the sending amount of the second driving unit 51, so that in a normal state where the belt 2 is not broken, The relative positional relationship of the first structure 3 and the second structure 4 with respect to the roller 5, the block 6, and the rollers 7 to 9 is maintained.

  In the configuration in which the relative positional relationship between the first structure 3 and the second structure 4 in the fall prevention device 1A is changed in a normal state, the first structure 3 and the first structure 3 do not interfere with the lifting operation. The distance between the stopper and the distance between the second structure 4 and the second stopper needs to be set longer than the change amount of the relative positional relationship. On the other hand, the fall prevention device 1A is a lifting device even if the distance between the first structure 3 and the first stopper in the normal state and the distance between the second structure 4 and the second stopper are sufficiently shortened. 100 up / down movement is not hindered. Furthermore, if the distance between the first structure 3 and the first stopper in the normal state and the distance between the second structure 4 and the second stopper are sufficiently short, the fall prevention device 1A can be used when the belt 2 is broken. The amount of fall of the first cylinder to the fourth cylinder before acting can be shortened.

  Further, since the folding member is composed of the rollers 8 and 9, the tension applied to the one end side of the belt 2 can be made equal to the tension applied to the other end side.

  In the fall prevention device 1A, the first stopper includes a roller 5 as a first member and a block 6 that is spaced apart from the roller 5 in a direction intersecting the first direction. In the direction intersecting the first direction, the distance between the roller 5 and the block 6 is not less than the width of the belt 2 and less than the width of the first structure 3. The second stopper includes a roller 7 serving as a third member and a block 6 serving as a fourth member disposed at a distance from the roller 7 in a direction crossing the second direction. That is, in the fall prevention device 1A, the second member and the fourth member are provided integrally. In the direction crossing the second direction, the distance between the roller 7 and the block 6 is not less than the width of the belt 2 and less than the width of the second structure.

  In this way, in the normal state, the belt 2 is allowed to move with respect to the first cylinder 20 as long as the first structure 3 does not contact the first stopper or the second structure 4 does not contact the second stopper. ing. Therefore, in the lifting device 100 including the fall prevention device 1A, the rewinding amount or the feeding amount of the first driving unit 50 and the second driving unit 51 is higher than that in the configuration in which the movement of the belt 2 is not allowed in the normal state. There is no need to control the accuracy.

  In the fall prevention device 1A, the first structure 3 and the first stopper are provided so as to be able to contact each other when the belt 2 passed between the first structure 3 and the second drive unit 51 breaks. It is preferred that The second structure 4 and the second stopper are preferably provided so as to be able to contact each other when the belt 2 passed between the second structure 4 and the first drive unit 50 breaks. For example, the first structure 3 has a curved surface provided so as to be able to make point contact with each of the roller 5 and the block 6. The second structure 4 has a curved surface provided so as to be able to make point contact with each of the roller 7 and the block 6.

  In this way, since the contact area between the first structure 3 and the first stopper and the contact area between the second structure 4 and the second stopper are suppressed, only the belt 2 that is broken in the lifting device 100 is used. When the recovery is performed by exchanging, the belt 2 can be easily exchanged.

  Preferably, the distance between the first structure 3 and the roller 5 in the first direction is equal to the distance between the second structure 4 and the roller 9 in the second direction. Preferably, the distance between the second structure 4 and the roller 7 in the second direction is equal to the distance between the first structure 3 and the roller 8 in the first direction.

  When the lifting / lowering device 100 performs the lifting / lowering operation, if a non-uniform tension is applied to the belt 2, the belt 2 moves relative to the first cylinder 20 to adjust the tension balance. Therefore, the distance between the first structure 3 and the roller 5 and the distance between the first structure 3 and the roller 8 in the first direction are longer than the determined minimum distance so that they do not contact each other during the balance adjustment. Need to be designed. For the same reason, the distance between the second structure 4 and the roller 7 and the distance between the second structure 4 and the roller 9 in the second direction must be designed to be longer than the determined minimum distance. . Further, the distance between the first structure 3 and the roller 5 in the first direction, the distance between the second structure 4 and the roller 9 in the second direction, and the second structure 4 and the roller 7 in the second direction. And the distance between the first structure 3 and the roller 8 in the first direction are adjusted to an appropriate distance during the balance adjustment, so that the impact received by each member at the time of breakage can be reduced. As a result, it is possible to repeatedly use the base 10 of the fall prevention device 1A by exchanging only the belt 2, for example.

Embodiment 2. FIG.
<Configuration of fall prevention device>
FIG. 9 is a diagram illustrating an example of the fall prevention device according to the second embodiment. As shown in FIG. 9, the fall prevention device 1B according to the second embodiment basically has the same configuration as the fall prevention device 1A according to the first embodiment, but a part of the first stopper is the first. It differs in that it is composed of one cylinder 20.

  The first stopper is a roller as a fifth member disposed at a distance from the inner peripheral surface 28 of the hollow portion of the first cylinder 20 and the inner peripheral surface 28 in the horizontal direction intersecting the first direction. 5 and the like. In the horizontal direction, the distance between the inner peripheral surface 28 of the first cylinder 20 and the roller 5 is not less than the width (thickness) of the belt 2 and less than the width of the first structure 3.

  The second stopper is a roller as a sixth member disposed at a distance from the inner peripheral surface 28 of the hollow portion of the first cylinder 20 and the inner peripheral surface 28 in the horizontal direction intersecting the second direction. 7 and the like. In the horizontal direction, the distance between the inner peripheral surface 28 of the first cylinder 20 and the roller 7 is not less than the width (thickness) of the belt 2 and less than the width of the second structure 4.

  Since such a fall prevention device 1B has basically the same configuration as the fall prevention device 1A according to Embodiment 1, it is possible to achieve the same effects as the fall prevention device 1A. Furthermore, in the fall prevention device 1B, the block 6 of the fall prevention device 1A is unnecessary. Therefore, the fall prevention device 1B has a simple structure as compared with the fall prevention device 1A and is low in cost. Note that the roller 5 and the roller 7 shown in FIG. 10 may be provided integrally.

Embodiment 3 FIG.
<Configuration of fall prevention device>
FIG. 10 is a diagram illustrating an example of the fall prevention device according to the third embodiment. As shown in FIG. 10, the fall prevention device 1 </ b> C according to the third embodiment basically has the same configuration as the fall prevention device 1 </ b> A according to the first embodiment, but the first stopper is the second stopper. The difference is that the first direction is spaced apart. In other words, the first stopper and the second stopper are not arranged symmetrically with respect to the center line of the first cylinder 20 extending in the vertical direction.

  The first stopper has the same configuration as the first stopper of the fall prevention device 1 </ b> A, and includes, for example, a roller 5 and a block 6.

  The second stopper is, for example, a seventh member that is folded back from the belt 2 so that the extending direction of the belt 2 is the first direction and the second direction and is spaced apart from the roller 8 in the horizontal direction. Block 11. In the horizontal direction, the distance between the roller 8 and the block 11 is not less than the width (thickness) of the belt 2 and less than the width of the first structure 3.

  Since the fall prevention device 1C according to the third embodiment has basically the same configuration as the fall prevention device 1A according to the first embodiment, the same effect as the fall prevention device 1A can be obtained.

Furthermore, the fall prevention device 1 </ b> C only needs to include the first structure 3 that is passed between the first stopper and the second stopper and is fixed to the belt 2 that extends in the first direction. In the fall prevention device 1C, the second structure 4 fixed to the belt 2 extending in the second direction in the fall prevention device 1A is not necessary. Therefore, the fall prevention device 1C has a simple structure as compared with the fall prevention device 1A and is low in cost.
<Modification>

  The fall prevention device according to Embodiments 1 to 3 may be configured as follows.

  Fall prevention device 1A-1C may be provided so that the position of the 1st stopper and the 2nd stopper can be changed. Specifically, the pedestal 10 may be provided with a plurality of regions to which the roller 5, the block 6 and the roller 7 can be fixed. In the modification of the fall prevention device 1A shown in FIG. 11, the roller 5, the block 6 and the roller 7 are arranged closer to the roller 8 and the roller 9 than the fall prevention device 1A shown in FIGS. It may be.

  In this manner, the distance between the first structure 3 and the roller 5 and the block 6 and the distance between the second structure 4 and the roller 7 and the block 6 in the normal state are the configurations shown in FIGS. It can be shortened compared to the interval at. As a result, the amount of fall of the first to fourth cylinders until the fall prevention device 1A acts when the belt 2 is broken can be made shorter than the amount of fall in the configuration shown in FIGS. .

  The fall prevention device 1A and the fall prevention device 1B may include only one roller 8 as a folding member. In this case, as shown in FIG. 12, the roller 8 is preferably disposed in the center between the two rollers 30 in the horizontal direction.

  In the fall prevention devices 1A to 1C, each of the first member, the third member, the fifth member, and the sixth member constituting the first stopper or the second stopper is configured as a roller. It is not something that can be done. The first member, the third member, the fifth member, and the sixth member may be configured as blocks, for example.

  In the fall prevention devices 1A and 1C, each of the second member, the fourth member, and the seventh member constituting the first stopper or the second stopper is configured as a block, but is not limited thereto. The second member, the fourth member, and the seventh member may be configured as rollers, for example.

  In fall prevention devices 1A and 1C, at least one of the 1st stopper and the 2nd stopper may be constituted by one member. As shown in FIG. 13, the first stopper may be configured only by the eighth member 12. When viewed from a horizontal direction (hereinafter referred to as a third direction) perpendicular to the first direction and the second direction, the eighth member 12 is disposed at two points, for example, with the belt 2 extending in the first direction interposed therebetween. The first structure 3 is provided so as to be able to contact. Similarly, the second stopper may be configured only by the ninth member 13. When viewed from the third direction, the ninth member 13 is provided so as to be in contact with the second structure 4 at, for example, two points arranged with the belt 2 extending in the second direction interposed therebetween. The eighth member 12 and the ninth member 13 are spaced apart from the belt 2 in the third direction and do not interfere with the belt 2.

  In the fall prevention devices 1A and 1C, at least one of the first stopper and the second stopper may be constituted by a plurality of stopper members arranged at intervals with the belt 2 interposed in the third direction. In the third direction, the interval between the plurality of stopper members may be not less than the width of the belt 2 and less than the width of the first structure 3 or the second structure 4.

  As shown in FIG. 14, in the fall prevention device 1 </ b> B, the first stopper may be disposed at a distance from the second stopper in the first direction. In this case, the fall prevention device 1B only needs to include the first structure 3 fixed to the belt 2 passed between the first stopper and the second stopper as the structure. In the fall prevention device 1B shown in FIG. 14, the second stopper is spaced from the inner peripheral surface 28 of the hollow portion of the first cylinder 20 and the inner peripheral surface 28 in the horizontal direction intersecting the first direction. And a roller 8 serving as a sixth member. In the horizontal direction, the distance between the inner peripheral surface 28 of the first cylinder 20 and the roller 8 is not less than the width (thickness) of the belt 2 and less than the width of the first structure 3. Even in this case, when the belt 2 is broken, the first stopper or the second stopper can stop the movement of the first structure 3 and the belt 2 fixed thereto to the one or the other. Furthermore, the second structure 4 is not necessary in the fall prevention device 1B. For this reason, the fall prevention device 1B shown in FIG. 14 has a simpler structure and is less expensive than the fall prevention device 1B shown in FIG.

  As shown in FIG. 15, the fall prevention device 1 </ b> C includes a portion 14 a that is spaced apart from the block 6 in a direction that intersects the first direction, and a portion that is spaced apart from the roller 8. A block 14 including 14b and a portion 14c connecting the portion 14a and the portion 14b may be provided. If it says from a different viewpoint, the said part 14a of the block 14 will be arrange | positioned at intervals with the block 6 as a 1st member, and will be comprised as a 2nd member. The portion 14b of the block 14 is disposed at a distance from the roller 8 as the third member, and is configured as a fourth member. The part 14a and the part 14b are integrally formed by being connected by the part 14c. For example, the portion 14 c is provided so as not to contact the first structure 3. The planar shape of the block 14 viewed from the third direction is, for example, a C shape. Even in this case, when the belt 2 is broken, the first stopper including the block 6 and the portion 14a or the second stopper including the roller 8 and the portion 14b is the first structure 3 and the belt 2 fixed thereto. Can be stopped from moving to the one or the other. Furthermore, the fall prevention device 1C shown in FIG. 15 has a simpler structure and is less expensive than the fall prevention device 1C shown in FIG.

  Moreover, the raising / lowering apparatus 100 provided with either of fall prevention apparatuses 1A-1C may be provided with the lock mechanism between several cylinders. Such an elevating device 100 can elevate and lower the first cylinder 20, the second cylinder 21, and the third cylinder 22 in order, for example.

  In addition, the fall prevention unit and the lifting device 100 including any of the fall prevention devices 1A to 1C may include a wire instead of the belt 2 as a linear body. In this case, the fall prevention devices 1A to 1C only need to include at least one structure fixed to the wire.

  Although the embodiment of the present invention has been described above, the above-described embodiment can be variously modified. The scope of the present invention is not limited to the above-described embodiment. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  1A, 1B, 1C Fall prevention device, 2 belt, 3 1st structure, 4 2nd structure, 5, 7, 8, 9, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45 Roller, 6, 11 block, 10 base, 12 8th member, 13 9th member, 20 1st cylinder, 21 2nd cylinder, 22 3rd cylinder, 23rd 4 cylinders, 24 base cylinders, 25 holding portions, 26 openings, 27 lid portions, 28 inner peripheral surfaces, 50 first drive portions, 51 second drive portions, 100 lifting devices.

Claims (11)

It is installed in a lifting device comprising a linear body and at least one lifting member that is lifted or lowered by winding or sending out the linear body, and when the linear body breaks, the at least one lifting member is dropped. A fall prevention device for preventing,
At least one structure fixed to the linear body;
A first stopper that is disposed on one side in the extending direction of the linear body with respect to the at least one structure and can stop the movement of the at least one structure to the one side;
A fall prevention device comprising: a second stopper that is disposed on the other side in the extending direction of the linear body with respect to the at least one structure and that can stop the movement of the at least one structure to the other side. . In the elevating device, wherein the at least one elevating member includes a first elevating member, and a part of the linear body is passed into the first elevating member,
The fall prevention device according to claim 1, wherein the at least one structure is fixed to the part of the linear body. The first stopper includes a first member and a second member disposed at a distance from the first member,
The distance between the first member and the second member is not less than the width of the linear body and less than the width of the at least one structure,
The second stopper includes a third member, and a fourth member disposed at a distance from the third member,
The fall prevention device according to claim 1 or 2, wherein an interval between the third member and the fourth member is equal to or greater than a width of the linear body and less than a width of the at least one structure.   The fall prevention device according to claim 3, wherein the second member and the fourth member are integrally provided. The first stopper includes a fifth member disposed at a distance from a part of the first elevating member,
A distance between a part of the first lifting member and the fifth member is not less than a width of the linear body and less than a width of the at least one structure;
The second stopper includes a sixth member disposed at a distance from another part of the first elevating member,
The fall prevention device according to claim 2, wherein a distance between another part of the first elevating member and the sixth member is equal to or greater than a width of the linear body and less than a width of the at least one structure. Further comprising at least one folding member that folds the linear body so that the extending direction of the linear body is a first direction and a second direction that intersects the first direction;
The first stopper is disposed at a distance from the folded member in the first direction,
The second stopper is disposed at a distance from the folding member in the second direction,
The at least one structure is passed between the folded member and the second stopper, the first structure fixed to the linear body passed between the folded member and the first stopper. The fall prevention device according to any one of claims 1 to 5, comprising a second structure fixed to the linear body. Further comprising at least one folding member that folds the linear body so that the extending direction of the linear body is a first direction and a second direction that intersects the first direction;
The first stopper is disposed at a distance from the second stopper in the first direction,
The fall prevention device according to any one of claims 1 to 5, wherein the at least one structure is fixed to the linear body that is passed between the first stopper and the second stopper.   The said at least 1 structure is the state fixed to the said linear body, when it contacts with the said 1st stopper or the said 2nd stopper, The state of any one of Claims 1-7. Fall prevention device.   The fall prevention device according to claim 8, wherein the at least one structure is screwed to the linear body. The fall prevention device according to any one of claims 1 to 9,
Comprising the linear body,
A fall prevention unit capable of switching between a state attached to the lifting device and a state detached from the lifting device. The linear body;
A first drive unit that winds or feeds one end of the linear body;
A second drive unit that winds or sends out the other end of the linear body;
A plurality of elevating members which are arranged in a nested manner and are raised or lowered by winding or sending out the linear body;
A lifting device comprising the fall prevention device according to any one of claims 1 to 9.