JP2010076848A - Lifting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lifting device capable of detecting an overload and the looseness of a wire member by a simple structure. <P>SOLUTION: This lifting device 10 lifts a lifting body through the wire member 14 by driving a motor, and includes a load detection device 16 for detecting both an overload and a reduction in load on the motor. In the load detection device 16, a mobile body 17 which moves when the lifting body is overloaded or the load on the lifting body is reduced is assembled in a body 11, a first detector 19 is attached to the mobile body 17, the first detector 19, a second detector 20, and a third detector 21 are positioned on the moving path of the mobile body 17, the first detector 19 of the mobile body 17 is moved by the load on the lifting body, detects the contact with the second detector 20, and drives the motor, and when the overload occurs, the second detector 20 moved together with the first detector 19 is brought into contact with the third detector 21 when the moved distance of the mobile body 17 is increased, detects the contact of the second detector 20 and the third detector 21, and stops the motor. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a lifting device that is attached to a ceiling of a structure such as a concert hall, a gymnasium, or a convention hall and that can be lifted and lowered by a wire member via a motor, and in particular, a load detection device that detects a load on the motor. It is related with the raising / lowering apparatus which comprised.

As an example of a conventional lifting device, a device in which a wire from a motor is routed around a pulley connected to a main body by a spring is known.
In such a lifting device, a load is applied to the lifting body, and the motor is driven in a state where the pulley is pulled. When the load is reduced, the wire is slackened, and when the spring is extended, the slack of the wire is detected and the motor is stopped.

As another example of a conventional lifting device, a device including an overload detection unit using a vertical movement unit is known (see, for example, Patent Document 1).
In such a lifting device, when a weight more than the specified weight set during operation is loaded, the wire pulls the vertical movement part in the vertical movement unit downward and detects the overload connected to the vertical movement part The unit detects an overload by pressing a non-movable horizontal shaft and stops the motor.

As another example of a conventional lifting device, one that performs overload detection using a detection lever is known (see, for example, Patent Document 2).
In such an elevating device, when an overload occurs in the wire, the wire moves the detection lever, and the actuator is operated by the movement of the detection lever so that a switch for detecting the overload and stopping the motor works. Yes.

Japanese Patent Laid-Open No. 7-94011 (FIG. 1, claim 1, paragraph numbers 0031 and 0032) Japanese Patent Application Laid-Open No. 11-16416 (FIG. 1, claim 1, paragraph numbers 0031, 0032, 0033)

  However, in the conventional lifting device, since the wire from the motor is routed around the pulley connected to the main body by the spring, the entire device becomes large and it is difficult to achieve compactness.

  In the lifting device disclosed in the above-mentioned Patent Document 1, in order to detect an overload of the wire, a vertically moving portion that moves together with the wire is provided, and the overall shape of the lifting device becomes large. In addition, since there is no device for detecting the slack of the wire, it is difficult to reliably lift and lower the lifting body when the slack occurs in the wire.

  In the lifting device disclosed in Patent Document 2, the movement of the large-diameter portion for detection due to the overload of the wire is detected via the detection lever, the action direction changing means, the switch, and the actuator, and the motor is stopped. In addition to increasing the number of parts and requiring a great amount of man-hours for parts management, it is disadvantageous in terms of cost, and, similarly to Patent Document 1, it is impossible to detect sagging of the wire.

  The present invention has been made to satisfy the above-described demand, and an object of the present invention is to provide an elevating device that can detect overload and slack of a wire member with a simple structure.

  The lifting device according to the present invention is a lifting device provided with a load detection device that raises and lowers a lifting body via a wire member by driving a motor, and detects both overload and reduction in load on the motor, The load detection device includes a moving body that moves in conjunction with an overload of the lifting body and a decrease in load, and the moving body is provided with a first detection body, the first detection body, the second detection body, The detection body and the third detection body are positioned on the movement locus of the moving body, and the first detection body of the moving body is moved by the load of the lifting body to detect contact with the second detection body. When the motor is driven and an overload occurs, the second detection body that moves together with the first detection body comes into contact with the third detection body due to an increase in the moving distance of the mobile body, and the second detection body Detecting the contact between the body and the third detection body. Characterized by stopping the motor.

In the present invention, since the load detection device has arranged the detection body on the movement locus of the moving body for detecting the load reduction caused by the overload and the slack of the wire member, it is not necessary to route the wire member like the conventional one. And not.
Therefore, the outer shape of the lifting device can be reduced.

  In the present invention, since the moving direction of the moving body and the moving direction of the detecting body are the same, the structure can be simplified.

In the present invention, the detection body can be displaced while being in contact with the motor by connecting the detection body to the main body via, for example, an urging spring.
Therefore, a malfunction due to a small overload and a decrease in load can be prevented.

  In the lifting device according to the present invention, in the load detection device, the first detection body and the second detection body are provided on a guide located on a side surface of the mobile body along a movement locus of the mobile body. When the moving body is positioned between the first detection body and the second detection body and the load on the lifting body is reduced while the lifting body is being moved up and down, the moving body and the first detection body Contact with each other, the moving body and the second detection body come into contact with each other, contact between the moving body and the first detection body, and between the moving body and the second detection body. When the contact is detected, the motor is stopped.

  In the present invention, it is possible to prevent a large load from being applied to the detection body by arranging the detection body on the side surface of the moving body. Furthermore, the biasing spring for arranging the detection body is unnecessary, and the number of parts can be greatly reduced.

  In the lifting device according to the present invention, the load detection device is disposed at a position opposite to a moving direction in which the moving body moves due to a load, and detects non-contact between the first detection body and the second detection body. Then, the motor is driven, the non-contact between the second detector and the third detector is detected, and the motor is stopped.

In the present invention, the load detection device can be installed on the side opposite to the moving direction of the moving body that moves due to the load by the structure for detecting the non-contact of the detecting body.
Therefore, even in the case of an overload, the detector is brought into non-contact, thereby preventing a load on the load detection device due to an excessive overload.

  In the lifting device according to the present invention, the load detection device detects contact and non-contact between the detection bodies, or contact and non-contact between the moving body and the detection body by a micro switch, and from the micro switch, It is characterized by detecting a signal.

  In the present invention, a contact state and a non-contact state can be easily and reliably detected by using a microswitch for detection of contact and non-contact between detection bodies, or contact and non-contact between a moving body and a detection body. Can do.

  In the lifting apparatus according to the present invention, the motor is the moving body.

  In the present invention, by using the motor as a moving body, the number of parts of the load detection device can be reduced, and the load detection device can be made compact.

  The lifting device according to the present invention is a lifting device that lifts and lowers a lifting body via a wire member by driving a motor, wherein the motor is connected to a main body for fixing the motor via a motor biasing spring. The overload and the decrease in load on the motor are detected at the position of the motor.

In the present invention, it is possible to detect an overload on the wire member and a slack in the wire member due to a decrease in the load at the position of the motor itself.
Therefore, it is not necessary to separately provide parts for detecting overload and sagging, and the number of parts can be reduced.

  In the present invention, since it is not necessary to route the wire member in order to detect overload and sagging, the outer shape of the lifting device can be reduced.

  In the present invention, since the motor is connected to the main body by the motor biasing spring, even if any impact is applied to the lifting body, the impact is absorbed by the motor biasing spring and the impact is directly applied to the motor. It is possible to protect the motor without giving it.

  In the lifting device according to the present invention, a wire member passes through a position where the motor and the main body come into contact with each other, and the motor moves due to a larger overload even after detecting an overload on the lifting body. The wire member is sandwiched between the motor and the main body to lock the wire member.

  In the present invention, when an overload larger than a load for detecting an overload occurs, the wire member is sandwiched between the motor and the main body to fix the wire member, thereby preventing a load on the motor due to the large overload. Can do.

  In the lifting device according to the present invention, the wire member passes through the motor biasing spring in a direction perpendicular to the expansion / contraction direction of the spring, and when the large overload occurs, the wire member is attached to the motor. The wire member is locked by being pinched by a spring.

  In the present invention, by fixing the wire member using the motor biasing spring that moves the motor, the number of parts at the fixing portion of the wire member can be reduced, and the lifting device can be made smaller.

  The lifting device according to the present invention is characterized in that the moving direction of the motor due to overload and load reduction is a vertical direction.

  In the present invention, by making the movement of the motor the vertical direction, the outer shape of the lifting device in the horizontal direction is reduced. Therefore, even if it is a ceiling with a small hole shape of the ceiling where the lifting device is installed, the lifting device can be reliably installed.

  The lifting device according to the present invention is characterized in that the moving direction of the motor due to overload and load reduction is a horizontal direction.

  In the present invention, the height of the lifting device is reduced by making the movement of the motor horizontal. Therefore, the lifting device can be reliably installed even on the ceiling where the height of the ceiling is low.

According to the lifting device of the present invention, the moving body that moves in conjunction with the overload of the lifting body and the decrease in the load is assembled to the main body, and the moving body is provided with the first detection body. The detection body and the third detection body are located on the movement locus of the moving body, the first detection body of the moving body is moved by the load of the elevating body, detects contact with the second detection body, and drives the motor. Further, when an overload occurs, the second detection body that moves together with the first detection body comes into contact with the third detection body due to an increase in the moving distance of the mobile body, and the contact between the second detection body and the third detection body is detected. And a load detection device for stopping the motor.
Thereby, it has the effect that an overload and the slack of a wire member can be detected with a simple structure.

  Hereinafter, lifting devices according to a plurality of embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
As shown in FIGS. 1, 2, and 3, the lifting device 10 according to the first embodiment of the present invention includes a main body 11, a lift motor 12, a winding drum 13, a wire member 14, and a lifting body 15. The load detection device 16 includes a movable body 17, a pair of motor biasing springs 18, a first detection body 19, a second detection body 20, and a third detection body 21. And a control circuit 22.

  The main body 11 is formed in a box shape with its top and front opened. The main body 11 has three guide grooves 24 formed in the vertical direction inside the peripheral plate 23, and a spring seat 25 protruding in an L shape at the lower end of the guide groove 24.

  The main body 11 has a pulley 27 rotatably attached to the front surface of the bottom plate 26. The main body 11 is fixed to a buried hole formed in the ceiling of a structure (not shown).

  The lift motor 12 has an output shaft 28 that can rotate forward and backward, and a winding drum 13 is coupled to the output shaft 28. The lift motor 12 is electrically connected to the control circuit 22.

  The take-up drum 13 winds the wire member 14. The wire member 14 is fixed to the upper surface of the bottom plate 26 of the main body 11 via a pulley (not shown) incorporated in the elevating body 15 after the end portion drawn from the winding drum 13 is hooked on the pulley 27. Yes.

  The wire member 14 is a belt made of a metal or resin having rigidity, and is formed in a belt shape that can be wound.

  The elevating body 15 includes a lighting fixture (not shown) inside the reflection plate 29. The elevating body 15 is locked to the main body 11 side during normal use and is disposed in the embedded hole.

  As shown in FIG. 4, in the load detection device 16, the moving body 17 is inserted into the guide groove 24 of the main body 11. A motor biasing spring 18 is assembled between the movable body 17 and the bottom plate 26 of the main body 11. The moving body 17 is supported by the guide groove 24 while being urged by the motor urging spring 18 and slides in the vertical direction with respect to the main body 11. The moving body 17 is fixed to the lift motor 12.

  The first detection body 19 is formed integrally with the moving body 17 at the bottom of the moving body 17. The first detector 19 is displaced as the movable body 17 slides.

  The 2nd detection body 20 is formed in plate shape, and has assembled the 2nd detection body spring 30 between the spring seats 25 under it.

  The 3rd detection body 21 is formed in the plate shape similarly to the 2nd detection body 20, The 3rd detection body spring 31 is assembled | attached between the spring seat 25 of the downward direction.

  The first detection body 19, the second detection body 20, and the third detection body 21 are arranged on the movement locus of the moving body 17. Therefore, the slide movement direction of the moving body 17 and the movement directions of the first detection body 19, the second detection body 19 and the third detection body 21 are the same direction.

  As shown also in FIGS. 5 and 6, the second detector 20 has a pair of guide protrusions 32 protruding from the side thereof. The guide protrusion 32 is movably engaged with the guide groove 24. Similarly to the second detection body 20, the third detection body 21 is also movably engaged with the guide groove 24.

  The second detector 20 has a first micro switch 33 attached to the upper surface thereof, and a second micro switch 34 attached to the lower surface thereof.

  The first micro switch 33 and the second micro switch 34 are electrically connected to the control circuit 22 with their electric wires 35.

  Next, regarding the operation of the lifting apparatus 10, each of [normal time], [sag detection], and [overload detection] will be described.

[Normal time]
As shown in FIGS. 7A and 7B, when the lifting body 15 is locked to the main body 11 side and disposed in the embedded hole, the lift motor 12 and the lifting body 15 are not loaded, The first detector 19, the second detector 20, and the third detector 21 are not in contact with each other, and the first microswitch 33 and the second microswitch 34 are all in the off state.

  When the elevator 15 is inspected, a drawer switch (not shown) is turned on. As a result, a current is supplied in the positive direction from the control circuit 22 to the lift motor 12, the output shaft 28 is rotated forward, the wire member 14 is pulled out from the winding drum 13, and the elevating body 15 is lowered.

  When energization of the lift motor 12 is stopped by turning off the drawer switch when the elevating body 15 is lowered to a predetermined position, the elevating body 15 stops at the predetermined position.

  As shown in FIGS. 8A and 8B, when the wire member 14 is pulled out, the lift motor 12 is loaded only with its own weight when the lift body 15 is lowered.

  At this time, since the motor urging spring 18 is elastically deformed in the contracting direction due to its own weight, the lift motor 12 and the moving body 17 are displaced downward, and accordingly, the first detection body 19 of the moving body 17 is moved. Contact the second detector 20.

  When the first detection body 19 comes into contact with the second detection body 20, the first micro switch 33 is turned on, and the ON signal of the first micro switch 33 is taken into the control circuit 22.

  The control circuit 22 processes the logic of switching the first micro switch 33 from OFF to ON, and forms a current-carrying circuit for the lift motor 12.

  After the inspection of the lifting body 15 is completed, a winding switch (not shown) is turned on. As a result, a current is supplied from the control circuit 22 to the lift motor 12 in the reverse direction, the output shaft 28 is rotated in the reverse direction, the wire member 14 is wound up by the take-up drum 13, and the elevating body 15 is locked to the main body 11 side. And placed in the buried hole.

[Looseness detection]
7A and 7B, when the lifting body 15 is inspected, while the lifting body 15 is being lowered by turning on the drawer switch, the descending lifting body 15 is, for example, a wall surface or the like. When the wire member 14 does not descend due to being caught on the floor or reaching the floor, sagging occurs in the wire member 14.

  Then, the weight of the lifting body 15 is apparently lightened, and the motor biasing spring 18 is elastically restored in the extending direction, so that the lift motor 12 and the moving body 17 are displaced upward, and accordingly, The first detection body 19 of the moving body 17 moves away from the second detection body 20.

  When the first detection body 19 moves away from the second detection body 20, the first micro switch 33 is turned off, and the OFF signal of the first micro switch 33 is taken into the control circuit 22.

  The control circuit 22 processes the logic of switching the first micro switch 33 from on to off, and cuts off the energization circuit to the lift motor 12.

  As a result, in the pulled state of the wire member 14 in which the drawer switch is turned on, the energization to the lift motor 12 is interrupted, and the drawing of the wire member 14 is stopped.

  At this time, since the second detection body 20 is assembled with the second detection body spring 30, the second detection body 20 follows the slide movement of the lift motor 12, that is, the moving body 17, with respect to the vibration of the lift motor 12 and the increase or decrease of the load. Thus, the first micro switch 33 is prevented from malfunctioning.

[Overload detection]

  Referring to FIGS. 8A and 8B, after the inspection of the lifting body 15 is completed, the lifting body 15 that is being lifted is turned up while the wire member 14 is being wound up by turning on the winding switch, for example. If the wire member 14 does not rise due to being caught by fixtures or the like, a large load is applied to the wire member 14.

  As shown in FIGS. 9A and 9B, when the wire member 14 is subjected to a large load, the motor biasing spring 18 is elastically deformed with a large stroke in the contraction direction. 17 is greatly displaced downward, and accordingly, the second detection body 20 contacts the third detection body 21 while the first detection body 19 of the moving body 17 is in contact with the second detection body 20.

  When the first detection body 19 comes into contact with the second detection body 20 and the second detection body 20 comes into contact with the third detection body 21, the first micro switch 33 and the second micro switch 34 are turned on and controlled respectively. The ON signal of the first micro switch 33 and the second micro switch 34 is taken into the circuit 22.

  The control circuit 22 processes the ON switching logic of the first micro switch 33 and the third micro switch 34 and cuts off the energization circuit to the lift motor 12.

  Thereby, in the winding state of the wire member 14 in which the winding switch is turned on, the energization to the lift motor 12 is interrupted, and the winding of the wire member 14 is stopped.

  Next, modified examples of the first detector 19, the second detector 20, and the third detector 21 applied to the load detector 16 of the first embodiment will be described.

  As shown in FIG. 10, in the first modification, the first microswitch 33 is attached to the lower surface of the first detector 19, and the second microswitch 34 is attached to the upper surface of the third detector 21.

  As shown in FIG. 11, in the second modification, the first microswitch 33 is attached to the upper surface of the second detector 20, and the second microswitch 34 is attached to the upper surface of the third detector 21.

  As shown in FIG. 12, in the third modification, the first microswitch 33 is attached to the lower surface of the first detector 19, and the second microswitch 34 is attached to the lower surface of the second detector 20.

  In any of the first modification, the second modification, and the third modification, the lifting device 10 performs the operations of [normal time], [sag detection], and [overload detection] in the same manner as described above.

In the present embodiment, the load detection device 16 uses the first detection body 19, the second detection body 20, and the third detection body 21 for detecting a decrease in load caused by overload and sagging of the wire member 14 as the moving body 17. Placed on the movement trajectory.
Thereby, it is not necessary to route the wire member as in the conventional case.
Therefore, the outer shape of the lifting device 10 can be reduced.

  In this embodiment, since the moving direction of the moving body 17 and the moving direction of each detection body 19, 20, and 21 are the same, a structure can be simplified.

In the present embodiment, the second detection body 20 is connected to the main body 11 via the second detection body spring 30, and the third detection body 21 is connected to the main body 11 via the third detection body spring 31.
Thereby, each detection body 20 and 21 can be displaced while contacting the lift motor 12.
Therefore, a malfunction due to a small overload and a decrease in load can be prevented.

  In the present embodiment, the microswitches 33 and 34 are used to detect contact and non-contact between the detection bodies 19, 20 and 21, and contact and non-contact between the moving body 17 and the detection bodies 19, 20 and 21. The contact state and the non-contact state can be easily and reliably detected.

  In this embodiment, by fixing the lift motor 12 to the moving body 17, the number of parts of the load detection device 16 can be reduced, and the load detection device 16 can be made compact.

In the present embodiment, the slack of the wire member 14 due to the overload on the wire member 14 and the reduction of the load can be detected at the position of the lift motor 12 itself.
This eliminates the need to separately provide components for detecting overload and sagging.
Therefore, the number of parts can be reduced.

In the present embodiment, the lift motor 12 is connected to the main body 11 by a motor biasing spring 18.
As a result, even if any impact is applied to the lift 15, the impact is absorbed by the motor biasing spring 18.
Therefore, the lift motor 12 can be protected without directly giving an impact to the lift motor 12.

  In the present embodiment, by making the movement of the lift motor 12 the vertical direction, the outer shape of the lifting device 10 in the horizontal direction is reduced. Therefore, even if it is a ceiling where the shape of the embedding hole of the ceiling which installs the raising / lowering apparatus 10 is small, the raising / lowering apparatus 10 can be installed reliably.

(Second Embodiment)
Next, a lifting device according to a second embodiment of the present invention will be described. In the following embodiments, components that are the same as those in the first embodiment described above or functionally similar components are simplified or omitted by giving the same reference numerals or equivalent symbols in the drawings. To do.

  As shown in FIGS. 13 and 14, the lifting device 50 according to the second embodiment of the present invention has a guide protrusion 51 that is inserted into the guide groove 24 of the main body 11 and serves as a contact, on the moving body 17. A first micro switch 52 corresponding to the first detection body is disposed above the guide groove 24, and a first micro switch 53 corresponding to the second detection body is disposed below the guide groove 24.

  The first micro switch 52 and the second micro switch 53 are provided on the guide groove 24 located on the side surface of the moving body 17 along the movement locus of the moving body 17.

  The guide protrusion 51 of the moving body 17 comes into contact with the first micro switch 52 as the moving body 17 is displaced upward, and turns on the first micro switch 52. The second micro switch 53 is turned on by contacting the 2 micro switch 53.

[Normal time]
In the lifting device 50, when the lifting body 15 is locked to the main body 11 side and disposed in the embedding hole, the lift motor 12 and the lifting body 15 are not loaded, and the first micro switch 52 and the second micro switch All the switches 53 are in an off state.

  The lifting device 50 lowers the lifting body 15 by turning on the drawer switch when the lifting body 15 is inspected. After the inspection of the lifting body 15 is finished, the lifting device 15 is turned on by switching the winding switch on. And lock it in the buried hole.

[Looseness detection]
When checking the lifting / lowering body 15, if the lifting / lowering body 15 is not lowered during the lowering of the lifting / lowering body 15 while the drawer switch is turned on and the sagging occurs in the wire member 14, the motor is energized. The spring 18 is elastically restored in the extending direction. Therefore, the lift motor 12 and the moving body 17 are displaced upward, and accordingly, the guide protrusion 51 of the moving body 17 switches the first micro switch 52 on.

  When the first micro switch 52 is turned on, the ON signal of the first micro switch 52 is taken into the control circuit 22. The control circuit 22 processes the logic of switching the first micro switch 52 from OFF to ON to cut off the energization circuit to the lift motor 12 and stops drawing the wire member 14.

[Overload detection]
When the lifting member 15 is not turned up while the wire member 14 is being wound up by turning on the winding switch after the inspection of the lifting member 15 is completed, a large load is applied to the wire member 14.

  When a large load is applied to the wire member 14, the motor biasing spring 18 is elastically deformed with a large stroke in the contraction direction, so that the lift motor 12 and the moving body 17 are greatly displaced downward. The guide protrusion 51 switches on the second micro switch 53.

  When the second micro switch 53 is turned on, the ON signal of the second micro switch 53 is taken into the control circuit 22. The control circuit 22 processes the on-switching logic of the first micro switch 53 to cut off the energization circuit to the lift motor 12, and the wire member 14 is stopped from winding.

In the present embodiment, the first micro switch 52 and the second micro switch 53 are arranged on the side surface of the moving body 17.
Thereby, a large load is not applied to each of the micro switches 52 and 53. Further, an urging spring or the like for disposing the micro switches 52 and 53 is not necessary.
Therefore, the number of parts can be greatly reduced.

(Third embodiment)
Next, a lifting device according to a third embodiment of the present invention will be described.

  As shown in FIGS. 15 and 16, the lifting device 60 according to the third embodiment of the present invention has a first detection body 61 and a second detection body at positions opposite to the moving direction in which the moving body 17 moves due to a load. The body 62 and the third detection body 63 are arranged.

  A first detector body spring 65 is assembled between the first detector body 61 and a spring seat 64 formed above the guide groove 24. The first detection body 61 has a first micro switch 33 attached to its lower surface.

  A second detection body spring 66 is assembled between the second detection body 62 and the spring seat 64, and the second micro switch 34 is attached to the lower surface thereof.

  The third detector 63 is integrally formed with the moving body 17 at the top of the moving body 17. The third detector 63 is displaced as the moving body 17 slides.

  The first detection body 61, the second detection body 62, and the third detection body 63 are disposed in the upper part along the movement locus of the moving body 17. Therefore, the slide movement direction of the moving body 17 and the movement directions of the first detection body 61, the second detection body 62, and the third detection body 63 are the same direction.

[Normal time]
In the lifting device 60, when the lifting body 15 is locked to the main body 11 side and disposed in the embedded hole, no load is applied to the lift motor 12 and the lifting body 15, and the elastic repulsive force of the motor biasing spring 18 is applied. As a result, the moving body 17 is raised. Therefore, the third detection body 63 is in contact with the second detection body 62, and the second micro switch 34 is in the ON state.

  The control circuit 22 forms an energization circuit for the lift motor 12 by receiving the ON signal of the second micro switch 34.

The lifting device 50 lowers the lifting body 15 by turning on the drawer switch when the lifting body 15 is inspected. After the inspection of the lifting body 15 is finished, the lifting device 15 is turned on by switching the winding switch on. And lock it in the buried hole.
[Sag detection]

  When checking the lifting / lowering body 15, if the lifting / lowering body 15 is not lowered during the lowering of the lifting / lowering body 15 while the drawer switch is turned on and the sagging occurs in the wire member 14, the motor is energized. The spring 18 is elastically restored in the extending direction. Therefore, the lift motor 12 and the moving body 17 are displaced upward, and accordingly, the second detection body 62 comes into contact with the first detection body 61 and the first micro switch 33 is turned on when the second micro switch 34 is in the on state. Switched.

  When the first micro switch 33 is turned on, the ON signal of the first micro switch 33 is taken into the control circuit 22. The control circuit 22 processes the logic of switching the first micro switch 33 from OFF to ON, cuts off the energization circuit to the lift motor 12, and stops pulling out the wire member 14.

[Overload detection]
When the lifting member 15 is not turned up while the wire member 14 is being wound up by turning on the winding switch after the inspection of the lifting member 15 is completed, a large load is applied to the wire member 14.

  When a large load is applied to the wire member 14, the motor biasing spring 18 is elastically deformed with a large stroke in the contracting direction, so that the lift motor 12 and the moving body 17 are greatly displaced downward. Accordingly, the first detection body 61 is separated from the second detection body 62, the second detection body 62 is separated from the third detection body 63, and the first micro switch 33 and the second micro switch 34 are switched off.

  When the first micro switch 33 and the second micro switch 34 are turned off, the off signals of the micro switches 33 and 34 are taken into the control circuit 22. The control circuit 22 processes the logic of the second micro switch 34 from on to off to cut off the energization circuit to the lift motor 12, and the wire member 14 is stopped from winding.

In the present embodiment, the non-contact of each of the detection bodies 61, 62, 63 is detected.
Thereby, the load detection apparatus 16 can be installed in the opposite side to the moving direction of the moving body 17 which moves with load.
Therefore, even in the case of an overload, the detectors 61, 62, and 63 are not in contact with each other, thereby preventing a load on the load detection device 16 due to an excessive overload.

(Fourth embodiment)
Next, a lifting device according to a fourth embodiment of the present invention will be described.

  As shown in FIGS. 17, 18, and 19, the lifting device 70 according to the fourth embodiment of the present invention includes a plurality of three first pulleys 71 and second pulleys 72 on the front surface of the bottom plate 26 of the main body 11. The third pulley 73 is rotatably attached.

  The load detection device 16 is opposed to the plate-shaped first wire member clamping portion 74 attached to the bottom plate 26 between the second pulley 72 and the third pulley 73, and the first wire member clamping portion 74. A plate-shaped second wire member clamping portion 75 extending from the moving body 17, and the same as the first detection body 19, the second detection body 20, and the third detection body 21, as in FIG. 2. .

  The wire member 14 drawn out from the winding drum 13 is hooked on the lower portion of the first pulley 71 and then hooked on the upper portion of the second pulley 72 and then passes through the upper portion of the first wire member clamping portion 74. Then, it is hooked on the upper part of the third pulley 73.

  The lifting device 70 performs operations of [normal time], [sag detection], and [overload detection] in FIGS. 7 (A), (B), FIG. 8 (A), (B), FIG. 9 (A), ( Perform in the same way as in B), and perform the [Detect large overload after overload] operation as follows.

[Large overload detection after overload]
After the inspection of the lifting body 15 is completed, when the lifting member 15 does not move up while the wire switch 14 is being wound up by turning on the winding switch, the energization circuit to the lift motor 12 is cut off and the wire member The winding of 14 is stopped.

  Then, when a further large overload is applied to the wire member 14 thereafter, the motor biasing spring 18 is further elastically deformed in the contraction direction, so that the lift motor 12 and the moving body 17 are further displaced downward. Accordingly, the second wire member clamping part 75 approaches the first wire member clamping part 74 and sandwiches the wire member 14 to prevent the movement of the wire member 14.

  Next, a modified example of the first wire member clamping unit 74 and the second wire member clamping unit 75 applied to the load detection device 16 of the fourth embodiment will be described.

  As shown in FIG. 20, in the first modification, the first wire member sandwiching portion 74 is formed in a U shape having an opening 76, and the second wire member sandwiching portion 75 is formed as the first wire member sandwiching portion 74. The opening 76 is formed in a quadrangular shape.

  As shown in FIG. 21, in the second modification, the first wire member clamping portion 74 is formed in a trapezoidal plate shape having the first inclined surface 77, and the second wire member clamping portion 75 is replaced with the first inclined surface. 77 is formed in a trapezoidal plate shape having a second inclined surface 78 parallel to 77.

In the present embodiment, when an overload greater than the load for detecting the overload occurs, the wire member 14 is replaced with the second wire member clamping portion 75 of the moving body 17 on the lift motor 12 side and the first wire member clamping portion of the main body 11. 74, the wire member 14 is fixed.
Thereby, after stopping the lift motor 12, the movement of the wire member 14 is prevented.
Therefore, the burden on the lift motor 12 can be reduced.

(Fifth embodiment)
Next, a lifting device according to a fifth embodiment of the present invention will be described.

  As shown in FIG. 22 and FIG. 23, the lifting device 80 according to the fifth embodiment of the present invention moves the wire member 14 drawn from the winding drum 13 from the pulley 27 to the string winding of the motor biasing spring 18. The inside is passed perpendicularly to the expansion and contraction direction of the motor biasing spring 18.

  The lifting device 80 performs operations of [normal time], [sag detection], and [overload detection] in FIGS. 7 (A), (B), FIG. 8 (A), (B), FIG. 9 (A), ( Perform in the same way as in B), and perform the [Detect large overload after overload] operation as follows.

[Large overload detection after overload]
After the inspection of the lifting body 15 is completed, when the lifting member 15 does not move up while the wire switch 14 is being wound up by turning on the winding switch, the energization circuit to the lift motor 12 is cut off and the wire member The winding of 14 is stopped.

  When a further overload is applied to the wire member 14 thereafter, the motor biasing spring 18 is further elastically deformed in the contraction direction. When the motor biasing spring 18 is elastically deformed in the contracting direction, the wire member 14 is sandwiched between the motor biasing springs 18 and prevents the wire member 14 from moving.

In the present embodiment, the wire member 14 is fixed using the motor biasing spring 18 that moves the lift motor 12.
Thereby, the number of parts of the fixing location of the wire member 14 can be reduced, and the raising / lowering apparatus 80 can be made small.

(Sixth embodiment)
Next, an elevator apparatus according to a sixth embodiment of the present invention will be described.

  As shown in FIG. 24, the lifting device 90 according to the sixth embodiment of the present invention sets the moving direction of the lift motor 12 in the horizontal direction due to overload and load reduction.

  The wire member 14 drawn out from the take-up drum 13 is hooked to the elevating body 15 via a pulley 27.

In this embodiment, the lift motor 12 is moved in the horizontal direction.
Thereby, the height of the lifting device 90 is reduced.
Therefore, the elevating device 90 can be reliably installed even on a ceiling where the height of the ceiling is low.

  In addition, the main body 11, the raising / lowering body 15, and each micro switch 33, 34, 52, 53 used by each said embodiment are not limited to what was illustrated, and can be changed suitably.

  For example, instead of the microswitches 33, 34, 52, 53, it goes without saying that an optical sensor or the like that can optically detect the positions of the detectors 19, 20, 21, 61, 62, 63 may be used. Yes.

The external appearance perspective view seen from diagonally downward of the raising / lowering apparatus of 1st Embodiment which concerns on this invention 1 is an external perspective view of the lifting device shown in FIG. FIG. 1 is an external perspective view around a moving body of the lifting device shown in FIG. Enlarged view of the load detection device in the lifting device of FIG. External appearance perspective view of the 1st detection body applied to the raising / lowering apparatus of FIG. Each front view of each detection body applied to the lifting apparatus of FIG. (A) is a front view before the elevating body descends to explain the operation of the elevating device in FIG. 1, and (B) is an enlarged view around the load detecting device in (A). (A) is a front view at the time of the descent | fall of the raising / lowering body explaining the operation | movement of the raising / lowering apparatus of FIG. (A) is the front view at the time of the overload explaining operation | movement of the raising / lowering apparatus of FIG. 1, (B) is an enlarged view around the load detection apparatus of (A). Each front view of the 1st modification of each detection body applied to the raising / lowering apparatus of FIG. Each front view of the 2nd modification of each detection body applied to the raising / lowering apparatus of FIG. Each front view of the 3rd modification of each detection object applied to the raising / lowering apparatus of FIG. The external appearance perspective view seen from diagonally upward of the raising / lowering apparatus of 2nd Embodiment which concerns on this invention FIG. 13 is an external perspective view of the lifting device shown in FIG. The external appearance perspective view seen from diagonally upward of the lifting apparatus of 3rd Embodiment which concerns on this invention FIG. 15 is an enlarged view around the load detection device of the lifting device shown in FIG. The external appearance perspective view seen from diagonally upward of the raising / lowering apparatus of 4th Embodiment which concerns on this invention FIG. 17 is an enlarged view around the load detection device of the lifting device shown in FIG. The front view of the load detection apparatus of the raising / lowering apparatus shown in FIG. The front view of the 1st modification of the load detection apparatus applied to the raising / lowering apparatus of FIG. The front view of the 2nd modification of the load detection apparatus applied to the raising / lowering apparatus of FIG. The external appearance perspective view seen from diagonally upward of the lifting apparatus of 5th Embodiment which concerns on this invention Enlarged view around the load detection device of the lifting device shown in FIG. External perspective view of the lifting device according to the sixth embodiment of the present invention as viewed obliquely from above

Explanation of symbols

10, 50, 60, 70, 80, 90 Lifting device 11 Main body 12 Lift motor (motor)
DESCRIPTION OF SYMBOLS 14 Wire member 15 Lifting body 16 Load detection apparatus 17 Moving body 18 Motor biasing spring 19, 61 1st detection body 20, 62 2nd detection body 21, 63 3rd detection body 24 Guide groove (guide)
33, 52 First micro switch (micro switch)
34, 53 Second micro switch (micro switch)

Claims (10)

A lifting device provided with a load detection device that raises and lowers a lifting body via a wire member by driving a motor, and detects both overload and reduction in load on the motor,
The load detection device includes a moving body that moves in conjunction with an overload of the lifting body and a decrease in load, and the moving body is provided with a first detection body, the first detection body, the second detection body, The detection body and the third detection body are positioned on the movement locus of the moving body, and the first detection body of the moving body is moved by the load of the lifting body to detect contact with the second detection body. When the motor is driven and an overload occurs, the second detection body that moves together with the first detection body comes into contact with the third detection body due to an increase in the moving distance of the mobile body, and the second detection body An elevating device that detects contact between a body and the third detection body and stops the motor.   In the load detection device, the first detection body and the second detection body are provided on a guide located on a side surface of the mobile body along a movement locus of the mobile body, When the moving body is positioned between the first detecting body and the second detecting body and the load on the lifting body is reduced, the moving body and the first detecting body come into contact with each other, and an overload occurs. The moving body and the second detecting body are in contact with each other, detecting contact between the moving body and the first detecting body and contact between the moving body and the second detecting body, and The lifting device according to claim 1, wherein the lifting device is stopped.   The load detecting device is disposed at a position opposite to a moving direction in which the moving body moves due to a load, detects non-contact between the first detecting body and the second detecting body, and drives the motor. The lifting device according to claim 1, wherein the motor is stopped by detecting non-contact between the second detection body and the third detection body.   The load detection device detects contact and non-contact between the detection bodies, or contact and non-contact between the moving body and the detection body by a micro switch, and detects a signal from the micro switch. The elevating device according to any one of claims 1 to 3.   The lifting apparatus according to claim 1, wherein the motor is the moving body.   In the lifting device that lifts and lowers the lifting body through a wire member by driving a motor, the motor is connected to a main body that fixes the motor via a motor biasing spring, and the motor is overloaded and loaded. An elevating device that detects a decrease in the position of the motor.   If the wire member passes through a position where the motor and the main body come into contact with each other and the motor moves due to a larger overload even after detecting the overload on the lifting body, the wire member is connected to the motor. The lifting device according to claim 6, wherein the wire member is locked between the main body and the wire member.   The wire member passes through the motor biasing spring in a direction perpendicular to the expansion and contraction direction of the spring, and when the large overload occurs, the wire member is sandwiched by the motor biasing spring, The lifting device according to claim 6, wherein the wire member is locked.   The elevating device according to any one of claims 6 to 8, wherein a moving direction of the motor due to an overload and a decrease in the load is a vertical direction.   The elevating device according to any one of claims 6 to 8, wherein the moving direction of the motor due to overload and load reduction is a horizontal direction.

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