JP2012115986A - Elevating-body falling prevention device and working machine with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely stop an elevating body when ascending/descending of the elevating body is stopped.SOLUTION: An elevating-body falling prevention device includes: a fixed locking tool 5; a movable locking tool 6 having a locking piece 17; and a driving device 8 for forwardly/backwardly moving the movable locking tool. The fixed locking tool has two or more receiving teeth 20 formed vertically spaced-apart at intervals. The locking piece has two or more locking teeth 21 formed vertically spaced-apart at intervals. The locking piece is ascendably/descendably provided on a holding tool of the movable locking tool so that the locking teeth of the locking piece face the receiving teeth of the fixed locking tool. The receiving teeth have a saw-tooth shape that is sharp-pointed to the locking-teeth side such that each upper surface is in a horizontal state and each bottom surface is downwardly inclined from the tip side to the root side. The locking teeth have a saw-tooth shape that is sharp-pointed to the receiving-teeth side such that each bottom surface is in a horizontal state and each upper surface has a downward slope from the root side to the tip side. If the movable locking tool is pushed to the fixed-locking-tool side by the driving device when ascending/descending of an elevating body is stopped, both of the locking teeth and the receiving teeth are engaged with each other, the locking teeth of the locking piece are forcibly pushed down by the receiving teeth, and the lower horizontal surfaces of the locking teeth are pressed against the upper horizontal surfaces of the receiving teeth, thereby preventing falling of the elevating body.

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.

Lifting body fall prevention device of the present invention, as claimed in claim 1, the device main body, attached to the work equipment lifting body is equipped to be movable up and down, to support the lifting member at the time of lifting down, lifting body Is a lifting / lowering body fall prevention device that prevents a fall of the vehicle , and includes a fixed locking tool, a movable locking tool having a locking piece, and a driving device , and the fixed locking tool has a fitting space in the vertical direction. Two or more receiving teeth are formed, the locking piece is formed with two or more locking teeth spaced apart in the vertical direction, and the driving device advances the moving locking tool relative to the fixed locking tool. -It can be retracted, the fixed locking tool can be attached to either the device body or the lifting body, the moving locking tool can be attached to the other, and the locking piece can be moved up and down to the moving locking tool Provided, the locking teeth of the locking piece are opposed to the receiving teeth of the fixed locking tool, and the receiving teeth have a sharp sawtooth shape on the locking tooth side. The upper surface is in a horizontal state, the bottom surface is inclined downward from the tip side to the base side, the locking teeth are sharp sawtooth shape on the tooth receiving side, the bottom surface is in a horizontal state, and the upper surface is the tooth receiving Contrary to the inclination, the slope is a downward slope from the root side to the tip side, and when the lifting / lowering of the lifting / lowering body is stopped, the movement locking tool is pushed to the fixed locking tool side by the driving device, and The locking teeth enter the engagement space of the receiving teeth of the fixed locking device and mesh with each other. At the time of the engagement, the locking teeth of the elevating locking piece are forcibly pushed down by the receiving teeth, and the locking teeth The lower horizontal plane is pressed against the upper horizontal plane of the receiving tooth and meshed with each other to support the lifting body to prevent the lifting body from falling. The engagement between the locking teeth and the receiving teeth is released, and the lifting body can be raised and lowered .

Lifting body fall prevention device of the present invention, as claimed in claim 2, wherein in the lifting body fall prevention device, the locking pieces are as a mobile locking device is vertically movably provided via a spring . According to a third aspect of the present invention, in the lifting / lowering body fall prevention device, the locking teeth are smaller in size than the receiving teeth, and are provided at a smaller interval than the receiving space of the receiving teeth. Two or more locking teeth can be inserted into the joint space. As described in claim 4, in the lifting body fall prevention device, the fixed locking tool is longer than the lifting range of the lifting body of the device main body, and a receiving tooth is provided on substantially the entire length thereof. The locking teeth of the movable locking tool can be locked to any of the receiving teeth. 6. The lifting / lowering body fall prevention apparatus according to claim 5, further comprising: a push spring that constantly pushes the movement locking tool toward the fixed locking tool, and the pressing spring advances the movement locking tool by a driving device. Even when the locking teeth and the receiving teeth are engaged with each other and when the moving locking device cannot be advanced by the driving device, the moving locking device is pushed against the fixed locking device, Engage the locking teeth and the receiving teeth of the locking piece with each other, and have a strong pressing force capable of supporting the moving locking tool on the fixed locking tool, and fix the locking teeth of the moving locking tool It pushes to the tooth-receiving side of a locking tool, and can ensure the meshing of both teeth.

Lifting body fall prevention device with working equipment of the present invention, as claimed in claim 6, and the apparatus main body, lifting member provided to be vertically movable in the vertical direction of that is provided, the workpiece mount to lift the robot A working device equipped with a movable body such as a support arm, and the movable body can be changed in height, lateral position, longitudinal position, orientation, angle, etc. by turning, rotating, elevating, moving back and forth, moving laterally, etc. The fixed locking tool of the lifting / lowering body fall prevention device according to any one of claims 1 to 5 is fixed to one of the device main body and the lifting body, and the movable locking tool and the driving device are fixed to the other. The receiving teeth of the locking tool and the locking teeth of the locking piece of the moving locking tool are opposed to each other, and the moving locking tool can be moved forward and backward with respect to the fixed locking tool by the driving device, and the lifting and lowering of the lifting body is stopped. Sometimes, the movement locking device is pushed to the fixed locking device side by the driving device. The locking teeth of the locking piece mesh with the receiving teeth of the fixed locking device, and the locking teeth of the locking piece are forcibly pushed down by the receiving teeth during the engagement, so that Are pressed against the upper horizontal surface of the receiving teeth and engaged with each other to support the elevating body so that the elevating body is prevented from falling .

Lifting body fall prevention device with working equipment of the present invention, as claimed in claim 7, wherein in the lifting body fall prevention device with working equipment, longer than the elevation range of the fixing fastener is the device body of the lifting body, the The receiving teeth are provided over substantially the entire length, and the locking teeth of the movable locking tool are locked to one of the receiving teeth when the lifting / lowering of the lifting / lowering body is stopped .

Lifting body fall prevention device with working equipment of the present invention, as claimed in claim 8, in the lifting body fall prevention device with work equipment, the switch provided on the moving locking device is the device body or lifting body attached, A switch pusher is provided on the movement latch, and when the switch is turned on or off by the switch pusher when the movement latch is retracted , the lifting / lowering of the lifting body is locked, and the movement latch is moved to the fixed latch side. the switch is the last advancement to implement push switch in which the lifting member is released the lock to be OFF or oN operation conversely with a locking mechanism comprising a vertically movable.

Temperature Fukarada fall prevention device 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.

Temperature Fukarada fall prevention device of the present application, press constantly moving fastener to the fixed locking device side by the compression spring, lift the locking teeth of the moving fastener and engaged with受歯fixed fastener Since the engagement of the locking teeth and the receiving teeth is ensured by double pressing of the driving device and the pressing spring, it is impossible to push by the driving device. Even if this occurs, it becomes a highly safe lifting body fall prevention device that can surely prevent the lifting body from being accidentally dropped.

Temperature Fukarada fall prevention device with working equipment of the present application, there are the following effects since the lifting body fall prevention device in the working device with a lifting body is equipped.
(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.

Temperature Fukarada fall prevention device with working equipment of the present application, the lock switch and the switch operating member is provided to lock the vertical movement of the lifting member by ON / OFF of the switch, or to unlock it to allow lifting the lifting body Since the mechanism 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.

Temperature Fukarada fall prevention device with work equipment present application, is provided with the compression spring in the lifting body fall prevention device to a mobile locking device of the working device, a push engagement locking teeth and受歯is by the drive It is ensured by the double push of the push spring, and even if an emergency situation that can not be pushed by the drive device occurs, it is possible to reliably prevent inadvertent dropping of the lifting body, and high safety It becomes work equipment.

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.

(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. As shown in FIG. 2, a large number of teeth 20 are formed at predetermined intervals (fitting space) in the longitudinal direction of the front surface of the fixed latch 5. 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 / lowering 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.

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 (8)

It is a lifting body fall prevention device that attaches to a work device equipped with a lifting body that can be lifted and lowered to support the lifting body when lifting is stopped and prevents the lifting body from falling .
A fixed locking device, a moving locking device including a locking piece, and a driving device ;
The fixed latch is provided with a fitting space in the vertical direction to form two or more receiving teeth,
The locking piece is formed with two or more locking teeth at intervals in the vertical direction,
The drive device can advance and retract the movable locking tool 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 movable locking device can be attached to the other,
The locking piece is provided on the movable locking tool so as to be movable up and down, and the locking tooth of the locking piece faces the receiving tooth of the fixed locking tool,
The tooth is a serrated shape sharp on the locking tooth side, the upper surface is in a horizontal state, and the bottom surface is inclined downward from the tip side to the root side,
The locking tooth is a sawtooth shape sharp on the tooth receiving side, the bottom surface is in a horizontal state, and the upper surface is a downward slope from the root side toward the tip side, contrary to the inclination of the tooth receiving,
When the lifting / lowering body stops moving up and down, the moving locking device is pushed to the fixed locking device side by the driving device, and the locking teeth of the locking piece enter the fitting space of the receiving teeth of the fixed locking device. Bite,
At the time of meshing, the locking teeth of the locking piece that can be moved up and down are forcibly pushed down by the receiving teeth, and the lower horizontal surface of the locking teeth is pressed against the upper horizontal surface of the receiving teeth and engaged to support the lifting body. The body is prevented from falling,
When the lifting body moves up and down, the movable locking device moves backward from the fixed locking device side, and the engagement between the locking teeth and the receiving teeth is released so that the lifting body can be lifted and lowered. apparatus. In the raising / lowering body fall prevention apparatus of Claim 1,
The raising / lowering body fall prevention apparatus characterized by the above-mentioned . In the raising / lowering body fall prevention apparatus of Claim 1 or Claim 2,
The locking teeth are smaller than the receiving teeth, are provided at a smaller interval than the receiving space of the receiving teeth, and two or more locking teeth can be inserted into one receiving space of the receiving teeth. Elevator fall prevention device characterized by this. In the prevention of falling of the lifting body according to any one of claims 1 to 3,
The fixed locking tool is longer than the lifting range of the lifting body of the device main body, and a receiving tooth is provided on substantially the entire length thereof, and when the lifting body stops moving up and down, the locking tooth of the moving locking tool is one of the receiving teeth. A lifting body fall prevention device characterized by being locked . In the raising / lowering body fall prevention apparatus of any one of Claim 1 thru | or 4,
It has a push spring that always pushes the moving latch toward the fixed latch,
The push spring advances the movement locking tool by a driving device to engage the locking teeth and the receiving teeth, and also does not allow the movement locking tool to be advanced by the driving device. Pushing the stopper against the fixed latch, and engaging the latching teeth and the receiving teeth of the locking piece of the moving latch to each other to push the stopper so that the movable latch can be supported by the fixed latch. A lifting / lowering body fall prevention device characterized in that it has a force and is capable of securing the engagement of both teeth by pushing the locking teeth of the moving locking tool toward the receiving side of the fixed locking tool . And the device body, lifting body provided to be vertically movable in the vertical direction of that is provided, the workpiece mount to lift the movable body such as a robot support arm is equipped with a movable body turning, rotating, lifting, moving back and forth In working equipment that can change height, lateral position, front and back position, orientation, angle, etc. by lateral movement, etc.
The fixed locking tool of the lifting body fall prevention device according to any one of claims 1 to 5 is attached to one of the apparatus main body and the lifting body, and the movable locking tool and the driving device are attached to the other. and 受歯fixed fastener, the locking teeth of the locking piece of the mobile fastener is opposed,
The movable locking device can be moved forward and backward with respect to the fixed locking device by the driving device,
When the lifting and lowering body stops moving up and down, the moving locking device is pushed to the fixed locking device side by the drive device, and the locking teeth of the locking piece mesh with the receiving teeth of the fixed locking device,
At the time of the engagement, the locking teeth of the locking piece are forcibly pushed down by the receiving teeth, the lower horizontal surface of the locking teeth is pressed against the upper horizontal surface of the receiving teeth and engaged, and the lifting body is supported and the lifting body is dropped. Work equipment with lifting body fall prevention device, characterized in that prevention is prevented . In the working equipment with the lifting body fall prevention device according to claim 6 ,
The fixed locking tool is longer than the lifting range of the lifting body of the device main body, and a receiving tooth is provided on substantially the entire length thereof, and when the lifting body stops moving up and down, the locking tooth of the moving locking tool is one of the receiving teeth. A working device with a lifting body fall prevention device characterized by being locked . In the working equipment with the lifting body fall prevention device according to claim 6 or claim 7,
A switch is provided on the device body or the lifting body to which the movement locking tool is attached,
A switch pusher is provided on the movement lock,
When the switch is turned ON or OFF by the switch pusher when the moving lock is retracted , the lifting / lowering of the lifting / lowering body is locked, the move lock moves forward to the fixed lock and the switch pushes the switch to the previous time. On the other hand, a work device with a lifting / lowering body fall prevention device, comprising a lock mechanism that releases the lock and allows the lifting body to move up and down when turned off or on.

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