Catch prevention device

Abstract

To provide a derailment detector capable of easily being installed and an elevator with the derailment detector.SOLUTION: A derailment detector 20 comprises distance sensors 22A, 22B and a safety controller 21 (a control part). The distance sensors 22A, 22B are installed on a car 110 and detects the distance to a counterweight 120. The safety controller 21 determines the derailment presence / absence of the counterweight 120 based on the detected result by the distance sensors 22A, 22B.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a pinch prevention device. [Background technology]

[0002] Elevators are known in which a pulley is located at the top of the elevator shaft and a main rope is wound around the pulley. When working on the elevator car of such an elevator, workers hold onto the main rope to stabilize their position. However, if the car is moved to the top of the elevator shaft while holding onto the main rope, the worker's hand may become pinched between the pulley and the main rope.

[0003] Patent Document 1 discloses an entanglement prevention device for preventing a worker's hand or other body part from getting caught between a pulley and a rope. The entanglement prevention device disclosed in Patent Document 1 is installed on a pulley that includes a pulley around which a rope is wound and a support that supports the rotation shaft of the pulley.

[0004] The anti-entanglement device includes a cover that covers at least a portion of both sides of the pulley, and a detachment mechanism for attaching and detaching the cover to and from the support body, and the cover has an insertion portion through which the rope unwound from the pulley is inserted. The detachment mechanism includes a hooked portion provided on the support body, a hooking claw provided on the cover for detachably hooking the hooked portion, and an operating mechanism for attaching and detaching the hooked portion by operating the hooking claw. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-225318 Summary of the Invention [Problem to be solved by the invention]

[0006] However, when the entanglement prevention device described in Patent Document 1 is attached to a pulley, the lower surface of the latched part comes into contact with the upper surface of the bottom plate of the support body while the latching claw is latched on the latched part. Therefore, the worker attaching the entanglement prevention device to the pulley needs to be in a position where the pulley can be reached.

[0007] When installing such an anti-entanglement device on the pulley of an existing elevator, a worker must climb onto the elevator car and raise the car to approach the pulley. At this time, there is a risk that the worker's hand, while holding the main rope, may become pinched between the pulley and the main rope. In other words, before installing the anti-entanglement device on the pulley, the worker's hand may become pinched between the pulley and the main rope.

[0008] In consideration of the above problems, the object of the present invention is to provide a pinch prevention device that can prevent fingers from being pinched between a pulley and a rope when performing maintenance and inspection of an existing elevator. [Means for solving the problem]

[0009] To solve the above problems and achieve the object, one aspect of the present invention provides a pinch prevention device that is disposed at the top of a hoistway and attached to a pulley support plate that rotatably supports a pulley. The pinch prevention device includes a first member, a second member, and a safety bar. The first member has an upper engagement portion that engages with the upper end of the pulley support plate. The second member is slidably engaged with the first member, is movable in the vertical direction, and protrudes downward beyond the first member. The second member has a lower engagement portion that engages with the lower end of the pulley support plate. The safety bar is movably supported by the second member and is displaceable in the vertical direction. [Effects of the Invention]

[0010] The pinch prevention device having the above configuration can prevent fingers from being pinched between the pulley and the rope when performing maintenance and inspection on an existing elevator. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a schematic diagram illustrating the configuration of an elevator that uses a pinch prevention device according to an embodiment. [Figure 2] This is a diagram showing the elevator's stop switch being activated and the car coming to a halt. [Figure 3] This figure shows the elevator's stop switch being released, causing the car to rise further. [Figure 4] 1 is a perspective view of a pinch prevention device according to an embodiment, seen from the front side; [Figure 5] 1 is a perspective view of a pinch prevention device according to an embodiment, seen from the rear side; [Figure 6] 10A and 10B are diagrams illustrating a state in which the anti-pinch device according to the embodiment is extended or retracted. [Figure 7] 10A to 10C are diagrams illustrating a procedure for attaching a pinch prevention device according to an embodiment to a pulley support plate. [Figure 8] 1 is a diagram showing a state in which a pinch prevention device according to an embodiment is attached to a pulley support plate; [Figure 9] This figure shows the state in which the stop switch is released after the pinch prevention device is attached to the pulley support plate, and the car is further raised. [Figure 10] 10 is a diagram showing the state in which the anti-pinch device is removed from the pulley support plate after work is completed. FIG. [Figure 11] FIG. 10 is a diagram showing the installation of an elevator stop switch. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, a pinch prevention device according to an embodiment will be described with reference to Figures 1 to 11. Note that common members in each figure are given the same reference numerals.

[0013] [Elevator configuration] First, the configuration of an elevator using a pinch prevention device according to one embodiment will be described with reference to FIG. FIG. 1 is a schematic diagram of an elevator using a pinch prevention device according to one embodiment.

[0014] As shown in Figure 1, elevator 1 is a drum elevator installed in a hoistway 100 formed within a building structure. In a drum elevator, a car is connected to one end of a main rope wound around a hoist, and it does not have a counterweight. Note that the elevator according to the present invention is not limited to drum elevators, and may also be a traction (bucket) elevator that has a counterweight.

[0015] The elevator 1 includes a car 110, a hoist 130, a main rope 160, a control panel 170, a speed governor 180, a buffer 190, and a stop switch 200.

[0016] A car guide rail (not shown) is attached to the wall of the elevator shaft 100. The elevator shaft 110 has a guide shoe that slidably engages with the car guide rail. One end of a main rope 160 is connected to the top of the elevator shaft 110. The elevator shaft 110 moves up and down within the elevator shaft 100 while being guided by the car guide rail. Hereinafter, the direction in which the elevator shaft 110 moves up and down is referred to as the up and down direction.

[0017] A machine room 101 is formed at the bottom of the hoistway 100. The hoisting machine 130 and a control panel 170 are arranged in the machine room 101 of the hoistway 100. A main rope 160 is wound around the hoisting machine 130. The other end of the main rope 160 is connected to the hoisting drum of the hoisting machine 130. The control panel 170 controls the driving of the hoisting machine 130.

[0018] A pulley 131 is disposed at the top of the hoistway 100. The pulley 131 is rotatably supported by two pulley support plates 132 fixed to the hoistway 100. The two pulley support plates 132 are made of plates having flat surfaces that are approximately perpendicular to the horizontal direction. A main rope 160 is wound around the pulley 131.

[0019] When the hoist 130 winds up the main rope 160, the car 110 rises along the car guide rail. On the other hand, when the hoist 130 feeds the main rope 160, the car 110 descends along the car guide rail.

[0020] A governor 180 and a shock absorber 190 are installed in a pit 102 at the bottom of the elevator shaft. In the unlikely event that the car 110 falls, the shock absorber 190 collides with the car 110 to absorb the impact.

[0021] The speed governor 180 has a speed governor rope (not shown) that moves in a circular motion in accordance with the rise and fall of the car 110. The speed governor 180 detects the rising and falling speed of the car 110 from the moving speed of the speed governor rope. When the rising and falling speed of the car 110 reaches a first overspeed (for example, 1.3 times the rated speed), the speed governor 180 sends a stop signal to the control panel 170. When the rising and falling speed of the car 110 reaches a second overspeed (for example, 1.4 times the rated speed), the speed governor 180 activates the emergency stop device via an operating lever. The emergency stop device is attached to the car 110. The emergency stop device grips the car guide rail and mechanically stops the rising and falling movement of the car 110.

[0022] Each floor of the building structure is provided with a landing 105 where the car 110 stops. The landing 105 is provided with a landing door 106 and a landing operation panel 107. The landing door 106 opens and closes the entrance and exit for people and objects to enter and exit the car 110. The landing operation panel 107 has a call button. A passenger who wishes to board the car 110 of the elevator 1 presses the call button on the landing operation panel 107. This causes the car 110 to stop at the floor where the call button was pressed.

[0023] The stop switch 200 is installed on the car guide rail. When the car 110 rises to a predetermined position, it activates the stop switch 200. When the stop switch 200 is activated, the control panel 170 stops driving the hoisting machine 130. This stops the car 110 from rising.

[0024] [Working on top of an elevator car] Next, the car work, which is one of the maintenance and inspection works for the elevator 1, will be described with reference to FIGS. 2 and 3. FIG. Fig. 2 is a diagram showing a state in which the stop switch 200 of the elevator 1 is activated and the car 110 is stopped. Fig. 3 is a diagram showing a state in which the stop switch 200 of the elevator 1 is released and the car 110 is further raised.

[0025] As shown in FIG. 2, when performing maintenance and inspection work on the elevator 1, a worker W may work on the car 110. When working on the car 110, the worker W holds onto the main rope 160 to stabilize his or her position. When the car 110 rises to a predetermined position, the car 110 activates the stop switch 200. This stops the car 110 from rising.

[0026] At this time, the distance from the top surface of the car 110 to the pulley 131 is set to be equal to or greater than the safety distance L. The safety distance L is determined according to the position from the top surface of the car 110 where the worker W grabs the main rope 160. This prevents the hand of the worker W, who is grabbing the main rope 160, from being pinched between the pulley 131 and the main rope 160.

[0027] Incidentally, maintenance and inspection work on the elevator 1 may require maintenance or inspection of a location that cannot be reached when the car 110 stops at a predetermined position. For example, as shown in FIG. 3, there are cases where the inspection range I of the landing door 106 on the top floor needs to be visually checked from the hoistway 100 side. In such cases, the stop switch 200 is released to allow the car 110 to rise from the predetermined position.

[0028] When the car 110 is raised from a predetermined position, the hand of the worker W holding the main rope 160 may be pinched between the pulley 131 and the main rope 160. Therefore, it is considered that when the car 110 stops at a predetermined position, a pinch prevention device is attached to the pulley support plate 132, and then the stop switch 200 is released to raise the car 110.

[0029] However, when the car 110 stops at a predetermined position, as shown in Fig. 2, the distance from the top surface of the car 110 to the pulley 131 is set to be equal to or greater than the safety distance L. This makes it difficult to perform work such as fastening using screws. In this embodiment, a pinch prevention device is provided that can be attached to the pulley support plate 132 from above the car 110 that has stopped at a predetermined position.

[0030] [Configuration of the pinch prevention device] Next, the configuration of a pinch prevention device according to one embodiment will be described with reference to FIGS. Fig. 4 is a perspective view of the anti-pinch device according to one embodiment, as seen from the front side, and Fig. 5 is a perspective view of the anti-pinch device according to one embodiment, as seen from the rear side.

[0031] As shown in FIGS. 4 and 5, the pinch prevention device 10 includes a first member 11, a second member 12, and a safety bar 13.

[0032] The first member 11 is formed in a rectangular cylindrical shape. The axial direction of the first member 11 is approximately parallel to the up-down direction. Hereinafter, the upper end of the first member 11 in the axial direction will be referred to as the upper part, and the lower end of the first member 11 in the axial direction will be referred to as the lower part.

[0033] The first member 11 has a front plate 11a, a back plate 11b, and two side plates 11c and 11d. The front plate 11a, the back plate 11b, and the side plates 11c and 11d are plates having flat surfaces that are approximately perpendicular to the axial direction of the first member 11. The front plate 11a and the back plate 11b face each other in the horizontal direction, and the side plates 11c and 11d face each other in the horizontal direction. The back plate 11b of the first member 11 faces the flat surface of a pulley support plate 132 (see FIG. 1) that supports a pulley 131.

[0034] An upper lock hole 15 and a lower lock hole 16 are formed in the side plate 11d of the first member 11. The upper lock hole 15 and the lower lock hole 16 are aligned at a predetermined distance in the axial direction of the first member 11. The upper lock hole 15 is located on the upper side of the first member 11, and the lower lock hole 16 is located on the lower side of the first member 11.

[0035] The first member 11 has an upper engagement portion 21. The upper engagement portion 21 is formed into a roughly U-shape by bending a metal plate. The upper engagement portion 21 has a fixing piece 21a, a connecting piece 21b, and an opposing piece 21c. The fixing piece 21a of the upper engagement portion 21 is inserted inside the first member 11 and is fixed to the inner surface of the front plate 11a using a screw 31.

[0036] The connecting piece 21b of the upper engaging portion 21 is connected to the fixed piece 21a and the opposing piece 21c. The connecting piece 21b closes the shaft hole at the upper end of the first member 11. The opposing piece 21c faces the back plate 11b of the first member 11 at an appropriate distance. The upper part of the pulley support plate 132 (see FIG. 1) is inserted between the opposing piece 21c and the back plate 11b. The connecting piece 21b abuts against the upper end of the pulley support plate 132 (see FIG. 1).

[0037] A magnet 22 is disposed on the surface of the opposing piece 21c facing the back plate 11b. The magnet 22 is fixed to the opposing piece 21c using a screw 32. The method for fixing the magnet 22 is not limited to using a screw, and other fixing methods such as adhesive or crimping may also be used. The magnet 22 is formed in a plate shape. One flat surface of the magnet 22 faces the back plate 11b of the first member 11. The magnet 22 is magnetically attracted to the lower part of the pulley support plate 132 (see FIG. 1).

[0038] The second member 12 is formed in a rectangular cylindrical shape. The axial direction of the second member 12 is approximately parallel to the up-down direction. Hereinafter, the upper end of the second member 12 in the axial direction will be referred to as the upper part, and the lower end of the second member 12 in the axial direction will be referred to as the lower part. The second member 12 is inserted into the axial hole of the first member 11 and is slidably engaged with the first member 11. Therefore, the second member 12 is movable in the axial direction (up-down direction) relative to the first member 11.

[0039] The second member 12 has a front plate 12a, a back plate 12b, and two side plates 12c and 12d. The front plate 12a, the back plate 12b, and the side plates 12c and 12d are plates having flat surfaces that are approximately perpendicular to the axial direction of the second member 12. The front plate 12a and the back plate 12b face each other in the horizontal direction, and the side plates 12c and 12d face each other in the horizontal direction.

[0040] The front plate 12a of the second member 12 faces the front plate 11a of the first member 11, and the back plate 12b of the second member 12 faces the back plate 11b of the first member 11. In addition, the side plate 12c of the second member 12 faces the side plate 11c of the first member 11, and the side plate 12d of the second member 12 faces the side plate 11d of the first member 11.

[0041] A lower engagement portion 23 is connected to the back plate 11b of the second member 12. The lower engagement portion 23 is formed into a crank shape by bending a metal plate. The lower engagement portion 23 has a fixing piece 23a, a connecting piece 23b, and an opposing piece 23c. The fixing piece 23a of the lower engagement portion 23 is fixed to the outer surface of the back plate 11b using a screw 33.

[0042] The connecting piece 23b of the lower engaging portion 23 is connected to the fixed piece 23a and the opposing piece 23c. The connecting piece 23b protrudes substantially perpendicularly from the upper end of the fixed piece 23a. The plane of the connecting piece 23b is substantially perpendicular to the up-down direction. The connecting piece 23b abuts against the lower end of the pulley support plate 132 (see FIG. 1).

[0043] The facing piece 23c protrudes upward from the end of the connecting piece 23b opposite the fixed piece 23a. The facing piece 23c faces the back plate 11b of the second member 12 at an appropriate distance. The lower part of the pulley support plate 132 (see FIG. 1) is inserted between the facing piece 23c and the back plate 11b.

[0044] A magnet 24 is disposed on the surface of the opposing piece 23c facing the back plate 12b. The magnet 24 is fixed to the opposing piece 23c using a screw 34. The method for fixing the magnet 24 is not limited to using a screw, and other fixing methods such as adhesive or crimping may also be used. The magnet 24 is formed in a plate shape. One flat surface of the magnet 24 faces the back plate 12b of the second member 12. The magnet 24 is magnetically attracted to the lower part of the pulley support plate 132 (see FIG. 1).

[0045] A lock button 25 is attached to the side plate 12d of the second member 12. The lock button 25 is located at the top of the second member 12 and penetrates the side plate 12d. The lock button 25 is biased by a biasing member (not shown) and protrudes substantially perpendicularly from the side plate 12d. When pressed, the lock button 25 is stored inside the second member 12. The tip of the lock button 25 is formed in a substantially spherical shape.

[0046] The second member 12 protrudes from the lower end of the first member 11. When the second member 12 is extended from the bottom of the first member 11, the lock button 25 fits into the lower lock hole 16 of the first member 11. When the lock button 25 fits into the lower lock hole 16, the second member 12 is fixed to the first member 11. This places the anti-entrapment device 10 in an expanded state in which the second member 12 is extended to the maximum extent from the first member 11. The lock button 25 and the lower lock hole 16 correspond to the lower lock mechanism of the present invention.

[0047] When the second member 12 retracts into the first member 11, the lock button 25 fits into the upper lock hole 15 of the first member 11. When the lock button 25 fits into the upper lock hole 15, the second member 12 is fixed to the first member 11. This places the anti-entrapment device 10 in a contracted state in which the second member 12 is retracted most deeply into the first member 11. The lock button 25 and the upper lock hole 15 correspond to the upper lock mechanism of the present invention.

[0048] The safety bar 13 is rotatably connected to the lower part of the second member 12. The safety bar 13 is formed into a substantially L-shape by bending a metal plate. The safety bar 13 has a rotating piece 13a and a contact piece 13b. One end of the rotating piece 13a penetrates the side plate 12d of the second member 12 and is located inside the second member 12.

[0049] One end of the rotating piece 13a is fixed to a rotating shaft 26. The rotating shaft 26 penetrates the front plate 12a and the back plate 12b of the second member 12 and is rotatably supported by the second member 12. The rotating piece 13a rotates together with the rotating shaft 26. A biasing member (not shown) is disposed inside the second member 12. The biasing member biases the rotating piece 13a downward in the rotation direction. For example, a torsion spring can be used as the biasing member.

[0050] The rotation range of the rotating piece 13a (safety bar 13) is determined by the vertical length of the through-hole provided in the side panel 12d through which the rotating piece 13a passes. In other words, the upper end of the through-hole in the side panel 12d prevents the rotating piece 13a from rotating upward. The lower end of the through-hole in the side panel 12d prevents the rotating piece 13a from rotating downward. Because the rotating piece 13a is biased by the biasing member, the rotating piece 13a abuts against the lower end of the through-hole in the side panel 12d.

[0051] Contact piece 13b is continuous with the other end of rotating piece 13a. Contact piece 13b is covered with a cushioning material (not shown). When the hand gripping main rope 160 comes into contact with contact piece 13b, worker W realizes that his / her hand is approaching pulley 131. Note that in the pinch prevention device according to the present invention, both rotating piece 13a and contact piece 13b may be covered with cushioning material.

[0052] [Installation procedure for pinch prevention device] Next, the procedure for installing the anti-pinch device 10 will be described with reference to FIGS. Fig. 6 is a diagram illustrating the extended and retracted state of the pinch prevention device 10. Fig. 7 is a diagram illustrating the procedure for attaching the pinch prevention device to the pulley support plate.

[0053] When attaching the anti-pinch device 10 to the pulley support plate 132 (see FIG. 7), the anti-pinch device 10 is put into an expanded state as shown on the left side of FIG. 6. This causes the anti-pinch device 10 to be at its longest in the vertical direction. This allows the worker W holding the anti-pinch device 10 on the car 110 stopped at a predetermined position to reach the upper engagement portion 21 of the device to the top of the pulley support plate 132.

[0054] Next, the worker W engages the upper engagement portion 21 of the pinch prevention device 10 with the upper portion of the pulley support plate 132 (see FIG. 7). At this time, the magnet 22 of the upper engagement portion 21 magnetically attracts to the upper portion of the pulley support plate 132. This makes it possible to easily fix the upper engagement portion 21 to the upper portion of the pulley support plate 132. When the upper engagement portion 21 engages with the upper portion of the pulley support plate 132, the first member 11 is prevented from moving in the up and down direction.

[0055] Next, the worker W presses the lock button 25 of the pinch prevention device 10 to release the second member 12 from the first member 11. Next, as shown in the center of Figure 6, the worker presses the second member 12 upward. This causes the second member 12 to slide on the inner surface of the first member 11 and retract into the first member 11.

[0056] When the second member 12 retracts into the first member 11, the lock button 25 fits into the upper lock hole 15 of the first member 11. This fixes the second member 12 to the first member 11, and the pinch prevention device 10 enters a contracted state. When the pinch prevention device 10 enters the contracted state, the lower engagement portion 23 engages with the lower part of the pulley support plate 132, and the magnet 24 of the lower engagement portion 23 magnetically attracts to the lower part of the pulley support plate 132. This makes it possible to easily fix the lower engagement portion 23 to the lower part of the pulley support plate 132.

[0057] When the lower engagement portion 23 engages with the lower portion of the pulley support plate 132, the attachment of the pinch prevention device 10 to the pulley support plate 132 is completed (see FIG. 7). In this manner, the worker W can attach the pinch prevention device 10 to the pulley support plate 132 simply by sliding the second member 12 relative to the first member 11.

[0058] The position of the upper lock hole 15 is set depending on the position at which the lower engagement portion 23 engages with the lower part of the pulley support plate 132. In other words, the position of the upper lock hole 15 is determined depending on the vertical length of the pulley support plate 132. Note that the pinch prevention device according to the present invention may have multiple upper lock holes aligned in the vertical direction, and may be configured to be attachable to multiple types of pulley support plates with different vertical lengths. In this case, it is preferable to provide an unlocking mechanism at the bottom of the second member 12 that keeps the lock button 25 in a pressed state.

[0059] [Working on a car using a pinch prevention device] Next, the work on the car 110 using the anti-entrapment device 10 will be described with reference to FIGS. Fig. 8 is a diagram showing a state in which the anti-pinch device 10 is attached to the pulley support plate 132. Fig. 9 is a diagram showing a state in which the stop switch 200 is released and the car 110 is further raised. Fig. 10 is a diagram showing a state in which the anti-pinch device 10 is removed from the pulley support plate 132. Fig. 11 is a diagram showing a state in which the stop switch 200 is installed.

[0060] When performing maintenance and inspection work on the elevator 1, a worker W gets on top of the car 110 and raises the car 110 through maintenance operation. When the car 110 reaches a predetermined position that ensures a safety distance L, the stop switch 200 is activated. This causes the car 110 to stop at the predetermined position (see FIG. 2).

[0061] In the maintenance and inspection work of the elevator 1, when the car 110 is to be raised above a predetermined position, first, the worker W attaches the anti-pinch device 10 to the pulley support plate 132 on the car 110 that has stopped at the predetermined position (see FIG. 8). The attachment of the anti-pinch device 10 is performed in accordance with the attachment procedure for the anti-pinch device 10 described above.

[0062] Next, the worker W releases the stop switch 200. This allows the elevator car 110 to be raised above the predetermined position. Subsequently, the worker W raises the elevator car 110 and performs maintenance and inspection work on, for example, the inspection range I of the hall door 106 (see FIG. 9).

[0063] When the ascending car 110 approaches the pulley 131, the hand of the worker W holding the main rope 160 comes into contact with the safety bar 13 (contact piece 13b) of the entrapment prevention device 10. This allows the worker W to recognize that the hand holding the main rope 160 is approaching the pulley 131. The worker W then stops the ascending of the car 110. Note that the safety bar 13 is not limited to coming into contact with the hand holding the main rope 160, and may come into contact with any part of the worker W's body.

[0064] The safety bar 13 is rotatably attached to the second member 12. As a result, when the hand of the worker W holding the main rope 160 comes into contact with the safety bar 13, the safety bar 13 rotates and displaces upward. This makes it possible to cushion the impact on the hand when it comes into contact with the safety bar 13. In addition, the contact piece 13b of the safety bar 13 is covered with a cushioning material. Therefore, it is possible to further cushion the impact on the hand when it comes into contact with the safety bar 13.

[0065] Furthermore, the safety bar 13 is biased downward in the rotation direction by a biasing member, which allows the safety bar to be positioned at the bottom of its rotation range and prevents the distance the safety bar can be displaced upward from becoming shorter.

[0066] When the maintenance and inspection work, which is performed by raising the car 110 above the predetermined position, is completed, the worker W removes the pinch prevention device 10 from the pulley support plate 132 (see FIG. 10). At this time, since the car 110 is positioned above the predetermined position, the pinch prevention device 10 is in a position within the reach of the worker W. Therefore, the worker W can easily remove the pinch prevention device 10 from the pulley support plate 132.

[0067] Next, the worker W lowers the car 110 to a predetermined position. Then, the worker W installs the stop switch 200 (see FIG. 11). This completes the maintenance and inspection work on the car 110 using the anti-pinch device 10.

[0068] The pinch prevention device 10 has the upper engaging portion 21 and the lower engaging portion 23 engaged with the pulley support plate 132, and the magnets 22, 24 magnetically attracted to the pulley support plate 132. Therefore, the pinch prevention device 10 will not naturally come off the pulley support plate 132 due to its own weight or shaking. Therefore, the pinch prevention device 10 may be left attached to the pulley support plate 132 for the next maintenance or inspection work.

[0069] The above has described the anti-trap device of the present invention, including its functions and effects. However, the anti-trap device of the present invention is not limited to the above-described embodiment, and various modifications are possible within the scope of the invention as defined in the claims.

[0070] In this embodiment, magnets 22, 24 are attached to the upper engagement portion 21 and the lower engagement portion 23. When sliding the second member 12 upward, it is preferable that the upper engagement portion 21 of the first member 11 is fixed to the pulley support plate 132. This allows the second member 12 to slide smoothly. On the other hand, when the lower engagement portion 23 is engaged with the pulley support plate 132, the lock button 25 engages with the upper lock hole 15, so the second member 12 does not move downward even if the lower engagement portion 23 is not fixed to the pulley support plate 132. Therefore, the priority of the magnet 22 of the upper engagement portion 21 is higher than the priority of the lower engagement portion 23.

[0071] As described above, when the pinch prevention device 10 has the lock button 25 and the upper lock hole 15, it is not necessary to attach the magnet 24 to the lower engagement portion 23. Conversely, when the magnet 24 is attached to the lower engagement portion 23, it is not necessary to provide the upper lock hole 15. In this embodiment, by providing both the upper lock hole 15 and the magnet 24, the second member 12 can be firmly fixed in place when the lower engagement portion 23 is engaged with the pulley support plate 132. Furthermore, even if one of the fixations is released, the pinch prevention device 10 can be prevented from coming off the pulley support plate 132.

[0072] Furthermore, it is not essential to attach the magnet 22 to the upper engagement portion 21. For example, the worker W may grasp the lower part of the first member 11 when sliding the second member 12 upward. In this case, even if the upper engagement portion 21 is not fixed to the pulley support plate 132, the second member 12 can slide smoothly.

[0073] The method of fixing the upper engagement portion 21 and the lower engagement portion 23 to the pulley support plate 132 is not limited to using the magnets 22 and 24. For example, elastically deformable rubber members may be used instead of the magnets. The rubber members are attached at the same positions as the magnets 22 and 24. The distance between the rubber member of the upper engagement portion 21 and the back plate 11b of the first member 11 is slightly smaller than the thickness of the pulley support plate 132. As a result, when the pulley support plate 132 is inserted between the rubber member and the back plate 11b of the first member 11, the rubber member elastically deforms and biases the pulley support plate 132. As a result, the upper engagement portion 21 is fixed to the pulley support plate 132. Similarly, the distance between the rubber member of the lower engagement portion 23 and the back plate 12b of the second member 12 is slightly smaller than the thickness of the pulley support plate 132. As a result, when the pulley support plate 132 is inserted between the rubber member and the back plate 12b of the second member 12, the rubber member elastically deforms to bias the pulley support plate 132. As a result, the lower engagement portion 23 is fixed to the pulley support plate 132.

[0074] In the above-described embodiment, the safety bar 13 is rotatably attached to the second member 12. However, the safety bar according to the present invention may be supported by the second member 12 so as to be linearly movable, as long as it is displaceable in the up and down direction.

[0075] In the above-described embodiment, the first member 11 is formed in a cylindrical shape. The upper part of the second member 12 can be housed inside the first member 11, and the lower part of the second member 12 protrudes from one axial end (lower part) of the first member 11. This allows the second member 12 to be slidably engaged with the first member 11 with a simple structure. Note that the first member and the second member according to the present invention are not limited to being cylindrical, and any shape can be adopted. Furthermore, the sliding direction of the second member is not limited to a linear direction, and may be, for example, a direction of rotation about a rotation axis.

[0076] In the above-described embodiment, the first member 11 and the second member 12 are connected to form an integrated unit. However, the pinch prevention device according to the present invention may be configured such that the first member 11 and the second member 12 are formed separately and connected when attached to the pulley support plate 132. In this case, there is no need to provide the lower lock hole 16.

[0077] In this specification, the words "parallel" and "orthogonal" are used, but these do not mean only "parallel" and "orthogonal" in the strict sense, but also include "parallel" and "orthogonal" and may also mean a "substantially parallel" or "substantially orthogonal" state within a range in which the functions can be exerted. [Explanation of symbols]

[0078] 1...Elevator, 10...Pinch prevention device, 11...First member, 12...Second member, 13...Safety bar, 15...Upper lock hole, 16...Lower lock hole, 21...Upper engagement part, 22, 24...Magnet, 23...Lower engagement part, 25...Lock button, 26...Rotating shaft, 100...Hoistway, 101...Machine room, 102...Pit, 105...Landing platform, 106...Landing platform door, 107...Landing platform operation panel, 130...Hoisting machine, 131...Pulley, 132...Pulley support plate, 160...Main rope, 170...Control panel, 180...Governor, 190...Buffer, 200...Stop switch

Claims

1. A pinch prevention device is attached to a pulley support plate that is disposed at the top of the elevator shaft and rotatably supports a pulley, a first member having an upper engagement portion that engages with an upper end of the pulley support plate; a second member slidably engaged with the first member and movable in the up-down direction, protruding downward from the first member and having a lower engaging portion that engages with a lower end of the pulley support plate; a safety bar that is movably supported on the second member and displaces in the up and down direction. Anti-pinch device.

2. The upper engagement portion has a magnet that is magnetically attracted to the pulley support plate. The anti-trap device according to claim 1.

3. The lower engagement portion has a magnet that is magnetically attracted to the pulley support plate. The entrapment prevention device according to claim 1 or 2.

4. a lower lock mechanism that fixes the second member to the first member at a position lower than the position at which the lower engagement portion engages with the pulley support plate; The anti-trap device according to claim 1.

5. an upper locking mechanism that fixes the second member to the first member at a position where the lower engaging portion engages with the pulley support plate; The anti-trapping device according to claim 1 or 4.

6. The first member is formed in a cylindrical shape, An upper portion of the second member can be accommodated inside the first member, and a lower portion of the second member protrudes from one axial end of the first member. The anti-trap device according to claim 1.

7. The safety bar is rotatably supported by the second member. The anti-trap device according to claim 1.

8. A biasing member is provided to bias the safety bar downward. The anti-trap device according to claim 1.

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