JP2008007296A - Lifting body fall prevention device and work machine with the device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely prevent a lifting body from being carelessly dropped by surely supporting the lifting body, enhance safety, also to prevent the engagement of receiving teeth with locking teeth from becoming instable since they are both hard to wear, and to secure safety for a long period of time. <P>SOLUTION: The lifting body fall prevention device 1 comprises: a fixed locking device 5 on which the receiving teeth 20 are formed; a movable locking device 6 on which the locking teeth 21 are formed; and a drive device 8 for moving forward and backward the movable locking device relative to the fixed locking device. The fixed locking device, the movable locking device, and the drive device are installable on one of an apparatus body 2 and a lifting body 3. The receiving teeth and the locking teeth are engaged with each other during the forward movement to support the lifting body, and disengaged from each other during the backward movement to release the support for lifting the lifting body. The drive device may comprise a pushing spring 25 for moving forward the movable locking device toward the fixed locking device in an emergency. A switch 15 is installed on the apparatus body or the lifting body so that the lifting of the lifting body is locked and unlocked. <P>COPYRIGHT: (C)2008,JPO&amp;INPIT

Description

  The present invention provides an elevating body fall prevention device for ensuring safety by preventing an inadvertent descent (falling) of an elevating body equipped with a movable body such as a work mounting base and a robot support arm, provided in a vertically long apparatus body. And a working device equipped with a lifting / lowering body fall prevention device equipped with the same.

  The present inventor previously developed a positioning device for a robot / workpiece and obtained a patent (see Patent Document 1). Thereafter, a work suspension device (positioner) was developed and a patent application was filed (see Patent Document 2).

  The positioning device for robots and workpieces of Patent Document 1 is provided on a workpiece mounting table by turning a workpiece mounting table and a robot arm on a vertically long main body so that the workpiece mounting table and a robot arm can be moved up and down. The height, orientation, angle, etc. of the workpiece can be adjusted, and the height, lateral position, front / rear position of the multi-joint welding robot attached to the arm by moving the robot arm up / down, lateral movement, forward / backward movement, etc. The desired location of the workpiece mounted on the workpiece mounting table can be welded by changing the above.

  The positioner disclosed in Patent Document 2 is provided with a work mounting base that can be moved up and down in a vertically long device body, and the height, direction, and angle of the work mounted on the work mounting base by turning, rotating, and lifting the work mounting base. Etc. can be adjusted, and a desired part of the workpiece can be welded by a welding robot in the factory.

  Since the work mounting base and robot arm of the work equipment are heavy (a few tons), it is dangerous to inadvertently drop (drop). Therefore, it is desirable to provide a lifting body fall prevention device from the safety aspect.

  Conventionally, as a lifting body fall prevention device, a disk brake is provided on the lifting body, a fixed rail is attached to the equipment body, and the fixed rail is clamped with the disk brake to prevent the lifting body from being accidentally dropped, and the lifting body is lifted and lowered. There is one that releases the clamp when it is operated.

Japanese Patent No. 3026790 JP 2003-117629 A

The conventional disc brake fall prevention means has the following problems.
(1) The braking force of the disc brake is about 1400 kgf at maximum. However, since the load applied to the lifting body when the work is placed on the work mounting base of the working device is 3 to 10 tf even in the standard product, the lifting body cannot be reliably prevented from falling.
(2) In any of the above work devices, it is difficult to install a disc brake due to its structure, and it is even more difficult when the number of disc brakes increases.
(3) If the pad of the disc brake is worn due to use, the braking force of the disc brake is reduced and it is difficult to reliably prevent the disc brake from falling.

  The present invention can be attached not only to the work equipment previously developed by the present inventor, but also to other work equipment provided with a lifting body, has a large braking force, and can reliably prevent the lifting body from falling, The present invention provides a highly safe fall prevention device that does not decrease the braking force even when used for a long period of time, and a work device to which the fall prevention device is attached.

  The lifting / lowering body fall prevention device according to the present invention, as claimed in claim 1, is attached to a work device equipped with a vertically-long apparatus body so that the lifting body can be lifted and lowered to prevent the lifting body from falling. A fixed locking tool in which a receiving tooth is formed, a moving locking tool in which a locking tooth is formed, and a drive device for moving the moving locking tool forward and backward relative to the fixed locking tool, The fixed locking device can be attached to either the device main body or the lifting body, and the moving locking device and the driving device can be attached to the other. The receiving teeth and the locking teeth mesh with each other when the moving locking device moves forward, and the lifting body. Is supported to prevent the fall, the meshing is released at the time of retreat, the support is released, and the lifting body can be raised and lowered.

  As described in claim 2, the lifting body fall prevention device according to the present invention is the lifting body fall prevention device according to claim 1, further comprising a push spring that constantly pushes the movable locking tool toward the fixed locking tool, The push spring pushes the moving locking device toward the fixed locking device when the drive device cannot press the moving locking device due to the occurrence of an emergency such as an electrical circuit or hydraulic equipment failure or an emergency stop of the lifting body. The elevating body can be supported by meshing the locking teeth of the movable locking tool with the receiving teeth of the fixed locking tool.

  As described in claim 3, the working device with the lifting body fall prevention device of the present invention is provided with a lifting body that can be moved up and down in a vertically long device body, and the lifting body has a work mounting base, a robot support arm, etc. The working apparatus according to claim 1, wherein the movable body is capable of changing height, lateral position, longitudinal position, orientation, angle, and the like by turning, rotating, moving up and down, moving forward and backward, moving laterally, and the like. The fixed locking tool of the lifting body fall prevention device is attached to either the device body or the lifting body, the moving locking tool and the driving device are attached to the other, the fixed locking tool and the moving locking tool are opposed, and the movement locking The tool can be moved forward and backward with respect to the fixed locking tool by the driving device, and the receiving teeth of the fixed locking tool and the locking teeth of the moving locking tool mesh with each other when the moving locking tool moves forward to support the lifting body. To prevent the fall, and when retreating, the mesh is released and the Lifting is released in which lifting body has to be lift.

  The working equipment with the lifting body fall prevention device according to the present invention is the working equipment with the lifting body fall prevention device according to claim 3, wherein the working body with the movement locking tool is attached to the equipment body or the lifting body. A switch is provided, and a switch operation tool is provided on the movement lock. When the switch is turned on or off by the switch operation tool when the movement lock is retracted, the lifting / lowering body is locked and the movement lock is fixedly locked. When the switch is advanced to the tool side and the switch is turned OFF or ON by the switch operating tool, the lock is released and the lifting body can be moved up and down.

  The working device with the lifting body fall prevention device according to the present invention is the working device with the lifting body fall prevention device according to claim 3 or 4, wherein the lifting body fall prevention device according to claim 2 is used. Is provided on the movable locking tool.

The lifting body fall prevention device according to claim 1 of the present application has the following effects.
(1) Since the lifting / lowering body is supported by meshing the receiving teeth of the fixed locking tool and the locking teeth of the moving locking tool, the lifting / lowering body is reliably supported and the accidental dropping of the lifting / lowering body is surely prevented. And safety is improved.
(2) Since both the receiving teeth and the locking teeth are not easily worn, the meshing of the both does not become unstable, and safety is ensured for a long time.
(3) Needless to say, it can be installed in a new work device, but can also be installed in an existing work device.
(4) If the slide shaft provided in the movement locking tool is guided by the guide body and the movement locking tool is moved back and forth, the movement of the movement locking tool is stabilized. For this reason, the engagement between the locking teeth of the movable locking tool and the receiving teeth of the fixed locking tool is ensured, and the inadvertent dropping of the lifting body can be prevented more reliably.

  In the lifting / lowering body fall prevention device according to claim 2 of the present application, the moving locking tool is always pushed toward the fixed locking tool by the pressing spring, and the locking teeth of the moving locking tool are engaged with the receiving teeth of the fixed locking tool. In addition, since the lifting body can be supported, the engagement between the locking teeth and the receiving teeth is ensured by double pressing of the driving device and the pressing spring. Even if an emergency situation that cannot be performed occurs, the elevator body fall prevention device with high safety can surely prevent the elevator body from being accidentally dropped.

The working equipment with the lifting body fall prevention device according to claim 3 of the present application has the following effects because the working equipment provided with the lifting body is equipped with the lifting body fall prevention device.
(1) Since the inadvertent dropping of the lifting body is surely prevented, it becomes a highly safe working device, and various operations such as assembly, welding, repair, and inspection can be performed with peace of mind.
(2) Since the structure of the lifting body fall prevention device is simple and small, it is easy to equip work equipment, and even if equipped, it does not interfere with the various operations.
(3) If the guide body is attached to the device main body or the lifting body to which the movement locking tool is attached, and the slide shaft of the movement locking tool is guided by the guide body to move back and forth, the front and rear of the movement locking tool Smooth movement and smooth engagement of the receiving teeth and the locking teeth ensure less wear on both teeth, ensuring locking, and preventing the lifting body from being accidentally dropped, ensuring safety. It becomes a high work equipment and can perform various operations such as assembly, welding, repair, and inspection with peace of mind.

According to claim 4 of the present application, the working device with the lifting body fall prevention device is provided with a switch and a switch operating tool, and locks the lifting of the lifting body by turning on / off the switch, or lifts the lifting body by releasing the lock. Since the lock mechanism that can be used is provided, the following effects can be obtained in addition to the above effects.
(1) Since the lifting mechanism can be reliably locked up and down by the lock mechanism, inadvertent dropping of the lifting body is more reliably prevented, resulting in a highly safe working device, and various operations such as assembly, welding, repair, and inspection. Can be done with confidence.
(2) Since it is possible to immediately determine whether the lifting body can be lifted or locked by turning the switch ON / OFF, it is possible for a worker or the like to immediately grasp the state of the lifting body during work. Contribute to the improvement of safety.

  In the working device with the lifting body fall prevention device according to claim 5 of the present application, the push spring in the lifting body fall prevention device according to claim 2 is provided in the movable locking tool of the working device, so Engagement of teeth is ensured by double pressing of pushing by the driving device and pushing by the push spring, and it is possible to reliably prevent inadvertent dropping of the lifting body even in the event of an emergency that cannot be pushed by the driving device. It can be a highly safe work equipment.

(Embodiment 1 of the lifting body fall prevention device)
One example of an embodiment of the lifting body fall prevention device (hereinafter referred to as “fall prevention device”) of the present invention will be described with reference to FIGS. As shown in FIG. 1, the fall prevention device 1 is equipped with a work device 4 in which an elevating body 3 is provided in a vertically long device main body 2 so as to be able to move up and down, thereby preventing the elevating body 3 from being accidentally dropped.

  As shown in FIG. 2, the fall prevention device 1 moves the metal vertical locking fixture 5, the metal movement locking fixture 6, and the movement locking fixture 6 back and forth toward the fixed locking fixture 5. A driving device 8 is provided.

  The fixed locking tool 5 is longer than the lifting / lowering range of the lifting / lowering body 3 so that the lifting / lowering body 3 can be locked and prevented from falling even if the lifting / lowering body 3 stops at any position within the lifting / lowering range. A large number of teeth 20 are formed at predetermined intervals in the longitudinal direction of the front surface of the fixed latch 5 as shown in FIG. Each of the receiving teeth 20 has a sawtooth shape and is sharpened toward the movable locking tool 6, and the upper surface is formed as a downward inclined surface with the horizontal surface and the bottom surface from the tip toward the back.

  As shown in FIG. 2, the movable locking tool 6 includes a metal reverse L-shaped holding tool 7, and a metal locking piece arranged on the front surface 7 b of the holding tool 7 and suspended from the holding tool 7. 17 and two guide bodies 10 that support and guide the holder 7. Two round bar-like slide shafts 9 are provided on the rear surface of the vertical plate of the holder 7, and each slide shaft 9 penetrates the guide body 10 and is supported by the guide body 10 while being horizontally (see FIG. 2 and left and right in FIG. 3, and can be moved forward and backward with respect to the fixed locking member 5. The guide body 10 is for supporting the load at the same time as guiding the slide shaft 9 moving back and forth.

  The locking piece 17 faces the fixed locking tool 5, and a large number of locking teeth 21 are formed at regular intervals in the front vertical direction. Each of the locking teeth 21 is also serrated and sharpened toward the fixed locking tool 5, and the upper surface thereof is a downward slope from the back to the tip side, opposite to the inclination of the receiving teeth 20, and the bottom surface. Is a horizontal plane, and the slope angle of the lower slope of the receiving tooth 20 and the upper slope of the locking tooth 21 is the same angle in the opposite direction. Further, the interval between the locking teeth 21 is half of the interval between the receiving teeth 20, and when the receiving teeth 20 and the locking teeth 21 mesh with each other as shown in FIG. The two teeth 21 are inserted and meshed with each other, so that the locking of the receiving teeth 20 and the locking teeth 21 is ensured.

  A suspension bolt 11 protrudes upward from the upper surface of the locking piece 17, and the suspension bolt 11 penetrates the upper lateral portion 7 a of the holder 7 from the bottom to the top, and sandwiches the spring 12 therebetween. It is suspended by a heavy nut 13 and hung. In this case, a clearance (space) 14 is formed between the bottom surface of the upper horizontal portion 7 a and the upper surface of the locking piece 17. Further, the plate-like sliding bracket 23 is fixed to either the front surface 7b of the holder 7 or the back surface 17a of the locking piece 17, so that the friction resistance between the front surface 7b and the back surface 17a is reduced, and the locking piece 17 is It can be moved up and down smoothly. The sliding metal fitting 23 can be made of oil-impregnated metal or other metal having good sliding characteristics.

  A hydraulic cylinder is used for the drive device 8, which is disposed on the back surface of the holder 7, and its piston rod 22 is connected to the back surface of the holder 7 between the two upper and lower slide shafts 9. When the piston rod 22 is fixed, the holding tool 7 and the locking piece 17 advance toward the fixed locking tool 5, so that the locking teeth 21 of the locking piece 17 and the receiving teeth 20 of the fixed locking tool 5. When the piston rod 22 is engaged and the piston rod 22 is pulled back, the retainer 7 and the locking piece 17 are retracted to release the engagement of both teeth. The operation of the driving device 8 is controlled by a hydraulic unit and an electric circuit (both not shown) of the device. The hydraulic unit may be provided with a single solenoid valve or a double solenoid valve.

  As shown in FIGS. 2 to 4, a push spring 25 is disposed on the outer periphery of the piston rod 22 of the drive device 8. The push spring 25 always pushes the moving locking tool 6 toward the fixed locking tool 5, and the pressing force is obtained by engaging the locking teeth 21 of the moving locking tool 6 with the receiving teeth 20 of the fixed locking tool 5. The lifting / lowering body 3 equipped with the movable locking tool 6 is strong enough to be locked to the fixed locking tool 5 and supported. As a result, the electromagnetic valve of the hydraulic unit is activated by the occurrence of an emergency such as occurrence of an abnormality in the electric circuit (for example, power failure), occurrence of an abnormality in the hydraulic unit (for example, oil leakage from the hydraulic hose), or emergency stop of the lifting body 3 by operation of the control panel. Immediately (simultaneously) when the piston rod 22 is in a free state in which the piston rod 22 can freely move back and forth (a state in which it cannot be forcibly pressed by the piston rod 22), the push spring 25 is moved by the pushing force. 6 is pushed toward the fixed locking device 5, the locking teeth 21 of the moving locking device 6 are engaged with the receiving teeth 20 of the fixed locking device 5, and the locking piece 17 is engaged with the fixed locking device 5. The upper surface of the holding member 7 locks the upper horizontal portion 7a of the holder 7 so that the elevating body 3 can be prevented from being accidentally dropped.

  When the receiving teeth 20 and the locking teeth 21 are engaged with each other, the lower inclined surface of the receiving teeth 20 and the upper inclined surface of the locking teeth 21 come into contact with each other, and the locking piece 17 is pushed down by the inclination of the inclined surfaces, so Meshes smoothly. By this depression, the spring 12 is compressed so that the teeth 20 and 21 are not forced. Further, the lower horizontal surface of the receiving tooth 20 and the upper horizontal surface of the locking tooth 21 come into contact with each other at the time of meshing, so that the locking of both the teeth 20 and 21 is ensured and the meshing is prevented from being released. Further, at the time of the backward movement, the meshing of the teeth 20 and 21 is disengaged so that the lifting body 3 can be lifted and lowered.

  A switch pusher 16 is fixed to the upper part of the holder 7 in the lateral direction. The switch pusher 16 is turned ON or OFF by pushing the switch 15 disposed behind the switch pusher 16 when the holder 7 is retracted as described above. Is turned OFF, and when the holder 7 moves forward as described above, it is separated from the switch 15 so that the switch 15 returns to OFF or ON, contrary to the previous time. In the switch 15, the holding tool 7 moves forward and the push by the switch pushing tool 16 is released, and the locking teeth 21 of the locking piece 17 mesh with the receiving teeth 20 of the fixed locking tool 5, and the lifting body 3 is supported (preventing falling). ), The lifting mechanism for the lifting body is locked so that the lifting body 3 does not move up and down, the holder 7 is retracted, the meshing of the teeth 20 and 21 is released, and the lifting body 3 can be raised and lowered. The lock mechanism is configured such that the lock is released by being pushed by the pusher 16 and the elevator 3 can be raised and lowered by the elevator lifting mechanism. The switch 15 may be a limit switch, a magnetic reed switch, a proximity switch, or the like.

(Embodiment 2 of the lifting body fall prevention device)
The receiving teeth 20 of the fixed locking tool 5 and the locking teeth 21 of the locking piece 17 can have any shape, size, number of teeth, inclination angle, etc. as long as they can mesh with each other. The drive device 8 may be other than a hydraulic cylinder, such as an air cylinder. The number of slide shafts 9 can also be three or more, or the number of drive devices 8 can be two or more.

(Embodiment 1 of work equipment with lifting body fall prevention device)
As shown in FIGS. 1 and 4, the lifting / lowering body fall prevention device described in the embodiment can be installed in the work equipment 4. As an example, the work device 4 shown in FIG. 1 has a vertically long device main body 2 provided with an elevating body 3 so as to be movable up and down. The device body 2 has a vertically long box shape, and is erected on a pedestal 40 formed in a substantially U-shaped plane, and vertically lift guides 41 are provided on both sides thereof in the vertical direction.

  The work supporting lift 3 is provided with a work support arm 31 projecting from the swivel board 30, a work mounting rotary disk 32 provided at the tip of the work support arm 31 and a swivel drive mechanism not shown. When the workpiece support arm 31 is moved up and down along the lifting guide 41 of the apparatus main body, the workpiece support arm 31 is also moved up and down, and the workpiece support arm 31 is also turned by turning the turntable 30. Rotates to change the height, orientation, and angle of the workpiece.

  A horizontally long base 34 is provided horizontally on the upper part of the apparatus body 2, and a left and right slide body 35 is attached to the front surface of the horizontal long base 34 so as to be slidable back and forth in the left and right direction. A robot support arm 36 is attached to the front surface of the left and right slide body 35 so as to protrude forward. A front / rear slide body 37 is provided inside the robot support arm 36, and an articulated arc welding robot (hereinafter referred to as “robot”) 38 is attached downward on the lower surface of the front / rear slide body 37. Therefore, the robot support arm 36 can run sideways (left and right in FIG. 1) along the horizontally long platform 34, and the robot 38 moves back and forth along the robot support arm 36 to move the robot 38 back and forth and right and left. The robot 38 can weld a desired portion of the work mounted on the work mounting turntable 32.

  In the working equipment with the lifting body fall prevention device of the present invention, the fixing latch 5 of the lifting body fall prevention device is fixed to the side surface of the equipment body 2 of the working equipment 4, and the lifting body drop is placed on the side surface of the lifting body 3. The holder 7, the locking piece 17, the guide body 10, the driving device 8, and the switch 15 constituting the movement locking device 6 of the prevention device 1 are attached in the positional relationship shown in FIG. Thus, the locking piece 17 can be moved back and forth by moving it back and forth.

(Usage example 1 of work equipment with lifting body fall prevention device)
The lifting / lowering body 3 of the work equipment 4 shown in FIGS. 1 to 4 can be stopped at a predetermined position without the fall prevention device 1 and can be lifted and lowered only when necessary, and does not fall inadvertently when stopped. However, by mounting the fall prevention device, the lifting body 3 can be supported and its fall prevented reliably, and the lifting and lowering body 3 can be lifted by releasing the support as necessary. The locking and unlocking can be performed as follows.
(1) When the elevating body 3 is stopped, as shown in FIGS. 3 and 4, the holder 7 and the locking piece 17 of the fall prevention device 1 are advanced to the fixed locking device 5 side by the drive device 8, and the tooth receiving 20 and the locking teeth 21 mesh with each other to support the elevating body 3 and prevent its dropping. At the time of meshing, the upper inclined surface of the locking tooth 21 advances along the lower inclined surface of the receiving tooth 20, and the upper inclined surface of the locking tooth 21 pulled up by the spring 12 with the progress is below the receiving tooth 20. It is forcibly pushed down on the slope and the lower horizontal surface of the locking tooth 21 is pressed against the upper horizontal surface of the receiving tooth 20, and there is a positive engagement with no gap between the locking tooth 21 and the receiving tooth 20. Stopping is ensured, and the elevating body 3 is supported and its fall is reliably prevented. At this time, the spring 12 is compressed. In addition, the switch pusher 16 is separated from the switch 15 and the switch 15 is turned on, and the lock mechanism is activated, and the lift 3 cannot be moved up and down even if the control panel is operated. At this time, since the holder 7 and the locking piece 17 are also pressed by the pressing spring 25 provided on the piston rod 22 of the driving device 8, the lifting body 3 is supported by the pressing by the driving device 8 and the pressing spring 25. It becomes a state secured by double pushing.
(2) To raise or lower the elevating body 3, the drive device 8 is operated, and the retainer 7 and the locking piece 17 are moved backward as shown in FIG. The meshing is released and the support of the elevating body 3 is released. When the meshing is released, the movable locking member 6 is pulled up by the restoring force of the spring 12 compressed previously. When the holder 7 and the locking piece 17 are retracted as described above, the switch pusher 16 is also retracted, the switch 15 is pushed, the switch 15 is turned OFF and the lock is released, and the lifting body 3 is operated by operating the control panel. It will be in a free state that can be raised and lowered. The pressing spring 25 is compressed as the holder 7 and the locking piece 17 are retracted. In this state, the control panel can be operated to raise or lower the lifting body 3 and stop it at a desired position.
(3) When the driving device 8 is operated in the stopped state to advance the holding tool 7 and the locking piece 17 to the fixed locking tool 5 side, the receiving teeth 20 and the locking teeth 21 mesh with each other as described above, and the lifting body 3 is supported and its fall is prevented again. At the same time, the push of the switch 15 is released and the switch 15 is turned on to automatically return to the locked state. At this time, since the holder 7 and the locking piece 17 are also pressed by the pressing spring 25 provided on the piston rod 22 of the driving device 8, the lifting body 3 is supported by the pressing by the driving device 8 and the pressing spring 25. It becomes a state secured by double pushing.
(4) Lifting / lowering body 3 is lifted / lowered by repeating the operations (1) to (3), stopped at a desired position, and supported / locked by the engagement of receiving teeth 20 and locking teeth 21 when stopped. The lock release and the lifting operation can be performed at any time.

(Usage example 2 of work equipment with lifting body fall prevention device)
As shown in FIGS. 2 to 4, in the work equipment provided with the push spring 25, an electric circuit or a hydraulic unit abnormally occurs (e.g., power failure or hydraulic hose oil leakage) while the elevating body 3 is raised or lowered, and the control panel is operated. Even if it is not possible to push the moving latch 6 toward the fixed latch 5 by the drive device 8 due to an emergency situation such as an emergency stop of the elevator 3, the push spring 25 is automatically moved by the pushing force. The locking tool 6 is pushed in the direction of moving forward toward the fixed locking tool 5 to engage the receiving teeth 20 and the locking teeth 21, and the upper surface of the locking piece 17 engaged with the fixed locking tool 5 is the holding tool 7. The upper horizontal portion 7a is locked to support the elevating body 3 to prevent the elevating body 3 from falling (see FIGS. 3 and 4).

(Usage example 3 of work equipment with lifting body fall prevention device)
2 to 4, when the emergency situation occurs when the receiving teeth 20 and the locking teeth 21 are engaged with each other and the lifting body 3 is supported, the working device 8 operates as follows. Since the pressing of the movable locking tool 6 is released, in some cases, the receiving teeth 20 and the locking teeth 21 are disengaged, the lifting body 3 is unlocked, and the lifting body 3 may be accidentally dropped. However, in the working device 4 having the pressing spring 25 shown in FIGS. 2 to 4, the moving locking tool 6 is forcibly pressed by the pressing force of the pressing spring at the time of release, so that the receiving teeth 20 and the locking teeth 21. Since the meshing is held, and the upper surface of the locking piece 17 meshed with the fixed locking tool 5 locks the upper horizontal portion 7a of the holding tool 7, the lifting body 3 does not fall inadvertently.

(Embodiment 2 of work equipment with lifting body fall prevention device)
The fall prevention device of the present invention can be installed in the work equipment (positioner) shown in FIG. 5 as shown in FIG. The work device 4 shown in FIG. 5 has a vertically long device main body 2 provided with a lifting / lowering body 3 for supporting a workpiece. The device body 2 has a vertically long box shape, and is erected on a pedestal 40 formed in a substantially U-shaped plane, and vertically lift guides 41 are provided on both sides thereof in the vertical direction. The work device 4 shown in FIG. 5 does not include the horizontally long base 34, the left / right slide body 35, the robot support arm 36, the front / rear slide body 37, and the robot 38 in the device main body 2, and the turntable 32 is formed in a ring shape. Work such as welding can also be performed from the lower side of the turntable 32.

  The workpiece support lifting / lowering body 3 has a workpiece support arm 31 projecting from the tip of a swivel board 30 and a work loading rotary disk 32 provided at the tip of the work support arm 31, and the swivel board 30 is not shown. When the mechanism is moved up and down along the lifting guide 41 of the apparatus body 2, the work support arm 31 is moved up and down, when the swivel board 30 is swung, the work support arm 31 is swung, and when the work mounting turntable 32 is rotated, the work support arm 31 is loaded. The work rotates so that the height, direction, and angle of the work change.

  The work device with the lifting body fall prevention device of FIG. 5 fixes the fixing holder 5 of the fall prevention device to the side surface of the device body 2 of the working device 4 of FIG. 5 and the lifting body fall prevention to the side surface of the lifting body 3. The holder 7, the locking piece 17, the driving device 8, the guide body 10, and the switch 15 of the device are attached in the positional relationship shown in FIG. 3, and the holding device 7 and the locking piece 17 are fixed by the driving device 8 of FIG. 1. The lifting / lowering body 3 can be moved back and forth, so that it can be operated in the same manner as the work equipment with the lifting / lowering body fall prevention device to support and release the lifting body 3.

(Embodiment 3 of working equipment with lifting body fall prevention device)
In Embodiments 1 and 2 of the working equipment with the lifting / lowering body fall prevention device, the fixed locking tool 5 is attached to the equipment body 2, the holding tool 7, the locking piece 17, the driving device 8, the guide body 10, and the switch 15 are connected to the lifting body 3. On the contrary, in the working equipment with the lifting body fall prevention device of the present invention, the fixed locking tool 5 is replaced with the lifting body 3, the holding tool 7, the locking piece 17, the driving device 8, and the guide body 10. The switch 15 can also be attached to the device main body 2.

(Other Embodiments of Work Equipment with Elevator Fall Prevention Device)
In the working equipment with the lifting body fall prevention device of the present invention, the working body 4 is not limited to the equipment body 2 as shown in FIG. Even when two or more lifting bodies 3 are provided so as to be able to move up and down, such as for workpiece mounting and robot support arm mounting, any of them can be equipped with a fall prevention device.

  The working device with the lifting body fall prevention device of the present invention is not limited to the working device of the above-described embodiment, but is a working device in which the lifting body can be lifted and lowered on the device body, and can be equipped with the fall prevention device of the present invention. If so, the present invention can be applied to work equipment of any structure, function, form, etc.

The perspective view which shows an example of embodiment of the raising / lowering body fall prevention apparatus of this invention, and a working equipment provided with the same. Front explanatory drawing which shows the state which the lifting body fall prevention apparatus shown in FIG. 1 cancel | released the support of the lifting body. Front explanatory drawing which shows the state which the lifting body fall prevention apparatus shown in FIG. 1 supported the lifting body. The partial expansion perspective view which shows the raising / lowering body fall prevention apparatus shown in FIG. The perspective view which shows an example of embodiment of the working equipment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fall prevention apparatus 2 Apparatus main body 3 Elevating body 4 Working apparatus 5 Fixed locking tool 6 Moving locking tool 7 Holding tool 8 Driving device 9 Support body 10 Guide body 14 Clearance 15 Switch 16 Switch pressing tool 17 Locking piece 20 Denture DESCRIPTION OF SYMBOLS 21 Locking tooth | gear 23 Sliding metal fitting 25 Push spring 30 Turning board 31 Work support arm 32 Rotating board 34 Horizontally long base 35 Left and right slide body 36 Robot support arm 37 Front and rear slide body 38 Robot 40 Base 41 Lifting guide

Claims (5)

  It is a lifting body fall prevention device that is attached to work equipment equipped with a vertically movable body so that the lifting body can be raised and lowered, and prevents the lifting body from falling. And a drive device for moving the moving lock forward and backward relative to the fixed lock. The fixed lock is attached to either the device main body or the lifting body. The stopper and the driving device can be attached to the other, and the receiving teeth and the locking teeth mesh with each other when the movable locking tool moves forward to support the lifting body to prevent its falling, and when the movement moves backward, the meshing is released and the support is supported. The lifting / lowering body fall prevention device characterized in that the lifting body can be lifted / lowered after being released.   2. The lifting / lowering body fall prevention apparatus according to claim 1, wherein the movable locking device is provided with a pressing spring that constantly presses the moving locking device toward the fixed locking device, the pressing spring causing an abnormality in an electric circuit or a hydraulic device, and an emergency stop of the lifting device. When the driving device cannot press the moving locking device due to an emergency situation such as the above, the moving locking device is pushed toward the fixed locking device, and the locking teeth of the moving locking device are moved to the receiving teeth of the fixed locking device. An elevating body fall prevention device characterized in that the elevating body can be supported by meshing.   A vertically long device body is provided with a lifting body that can be moved up and down, and the lifting body is equipped with a movable body such as a work mounting base and a robot support arm. The movable body is swiveled, rotated, lifted, moved back and forth, and moved laterally. In the working equipment in which the height, lateral position, front and rear position, orientation, angle, etc. can be changed by, for example, the fixed locking tool of the lifting body fall prevention device according to claim 1 is attached to either the equipment body or the lifting body. The movable locking device and the driving device are attached to the other, the fixed locking device and the moving locking device are opposed to each other, and the moving locking device can be moved forward and backward with respect to the fixed locking device by the driving device. The receiving teeth of the stopper and the locking teeth of the moving locking device mesh with each other when the moving locking device moves forward to support the lifting body and prevent its falling, and when retreating, the meshing is released and the support is released and the lifting body is released. The lifting body is characterized by the fact that it can move up and down Prevention device with work equipment.   4. A work apparatus with a lifting / lowering body fall prevention device according to claim 3, wherein a switch is provided on the apparatus main body or the lifting body to which the movement locking tool is attached, a switch operating tool is provided on the movement locking tool, and the movement locking tool is retracted. Sometimes when the switch is turned ON or OFF by the switch operating tool, the lifting and lowering of the lifting body is locked, the moving locking tool moves forward to the fixed locking tool, and the switch is turned OFF or ON by the switch operating tool in the opposite direction. Then, the working equipment with the lifting body fall prevention device is provided with a lock mechanism that allows the lifting body to move up and down when the lock is released. 5. A working device with a lifting body fall prevention device according to claim 3 or claim 4, wherein a push spring in the lifting body fall prevention device according to claim 2 is provided on the movable locking tool. Work equipment with equipment.

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