JPH09175787A - Elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize or minify a fleet angle as much as possible and also reduce the mis-operation of a loose detection means caused by a winding collapse at the winding back time of a wire rope. SOLUTION: In this elevator, a drive part 23 for winding up and winding back a wire rope 31 is built-in in the one end side of a device main body 21, a first sheave 26 for changing its direction so as to form the rope 31 in U letter shape is built-in in the other end side of the main body 21 and a second sheave 29 for changing the rope 31 through the first sheave 26 downward which is positioned between the sheave 26 and the drive part 23 is built-in in the main body 21 and an elevating body 32 is hung by the rope 31 through this sheave 29 and the elevating body 31 is elevated by the wind up and wind back of the rope 31 and also a loose detector 35 for stopping the motion of the drive part 23 by the detection of the loosening of the rope 31 is installed in the device main body 21. In this case, the loose detector 35 is arranged between the first sheave 26 and the second sheave 29.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is installed in a high place on the ceiling side of a gymnasium, a warehouse, etc. for winding a wire rope.
The present invention relates to a lifting device that lifts and lowers an object to be lifted, such as a lighting fixture, which is connected to a lifting body that is suspended by the rewinding.

[0002]

2. Description of the Related Art FIGS. 7 to 9 show the structure of a conventional lifting device installed on a high ceiling. In these drawings, reference numeral 1 denotes a device having a rectangular box shape in which at least the central portion of the lower surface is open. Main body, 2 is a drive unit, 3 is a first pulley, 4 is a second pulley, 5
Is a wire rope, 6 is a lifting body, 7 is a lighting fixture, 8 is a lifting body holder, 9 is slack detecting means, 10 is a rope detecting section, 1
Reference numeral 1 denotes a reverse winding detection switch, and all parts other than the lifting body 6 and the lighting fixture 7 are built in the apparatus main body 1.

The drive unit 2 includes a winding drum 2a and a motor 2b with a speed reducer for rotating the winding drum 2a in the forward and reverse directions, and is disposed at one end of the apparatus main body 1. The first pulley 3 is the device body 1
Is horizontally arranged at the other end. Such an arrangement is a measure for reducing the fleet angle.

The fleet angle is a winding angle of the wire rope 5 with respect to the winding drum 2a, and a line drawn from the center of the first pulley 3 perpendicularly to the drum shaft of the winding drum 2a and the first pulley 3. The angle formed by the line connecting the center to the inside of the flange on the drum shaft. When the fleet angle is large, there are disadvantages that when the wire ropes 5 approach the flange, the arrangement of the wire ropes 5 is disturbed or the edges of the first pulley 3 rub the wire ropes 5, and It is known that, when the wire rope 5 is wound around the winding drum 2a, the fleet angle needs to be reduced in order to wind the wire rope 5 in the aligned manner.

The second pulley 4 is vertically arranged between the drive unit 2 and the first pulley 3 and usually at the central position of the apparatus main body 1. The wire rope 5 fixed to the winding drum 2a is wound around the first pulley 3 to change its direction into a U shape, and
The second pulley 4 is wound around, the direction is changed downward, and the second pulley 4 is pulled around, and the elevating body 6 is suspended below the second pulley 4. A lighting fixture 7 is connected to the lifting body 6.

Therefore, by operating the motor 2b to rewind the wire rope 5 from the winding drum 2a,
The lighting fixture 7 can be lowered to the floor surface together with the lifting / lowering body 6, and conversely, by winding the wire rope 5 around the winding drum 2a, the lighting fixture 7 can be raised together with the lifting / lowering body 6. The lifting body holder 8 is arranged in the central portion of the apparatus main body 1 with a lock claw 8a that is engaged and disengaged as the lifting body 6 moves up and down, and the lifting body 6 is lifted to a predetermined rising position. The lock claw 8a is engaged to support the lifting body 6.

In the lifting device, the slack of the wire rope 5 when the lighting device 7 reaches the floor 12 (see FIG. 9 (B)) due to the descent of the lighting device 7 as described above,
Looseness detection means 9 for automatically stopping the operation of the motor 2b
When all the wire ropes 5 are unwound from the winding drum 2a, the reverse winding detection is performed so as to detect the rope 5 so as not to be wound around the winding drum 2a in reverse and automatically stop the operation of the motor 2b. And means are provided.

The slack detecting means 9 is formed to include the first pulley 3. Specifically, as shown in FIG. 7 and FIG. 8, the support shaft 3 a of the first pulley 3 is attached to the base 13 provided at the other end of the apparatus main body 1 that is separated from the drive unit 2 by the wire rope 5. The support shaft 3a and the spring bearing 13 of the base 13 are mounted so as to be movable in the winding and rewinding directions.
and the coil spring 14 is attached to the support shaft 3a.
A micro switch 15 which has an actuator 15a in contact with and is opened / closed in conjunction with the horizontal movement of the first pulley 3 is attached to the base 13. The coil spring 14 is arranged on the opposite side of the drive shaft 2 with respect to the support shaft 3a, and always pulls the first pulley 3 in the direction of arrow A in FIG.

As shown in FIG. 9 (A), while the lighting fixture 7 is descending, the weight of the fixture 7 causes the first pulley 3 of the slack detecting means 9 to coil in the direction of arrow B in FIG. 9 (A). Since it is pulled and moved against the spring force of the spring 14, the first
The support shaft 3a of the pulley 3 does not press the actuator 15a. Therefore, the micro switch 15 maintains the ON state, and the operation of the motor 2b of the drive unit 2 is continued. In addition, the lighting fixture 7 is operated as shown in FIG.
When the floor surface 12 is reached, the weight load of the luminaire 7 on the unwound wire rope 5 is removed, so that the rope 5 is loosened and the force to pull the first pulley 3 disappears. Therefore, as the first pulley 3 is pulled back in the direction of arrow C in FIG. 9 (B) by the spring force of the coil spring 14, the support shaft 3a pushes the actuator 15a to turn off the micro switch 15, so that the motor 2b operates. Be stopped.

Further, the reverse winding detecting means is formed by the rope detecting portion 10 and the reverse winding detecting switch 11 which are arranged between the winding drum 2a and the first pulley 3 as shown in FIGS. Has been done. The rope detection unit 10
A leaf spring, one end of which is fixed to the apparatus main body 1 and the other end of which intersects with a wire rope portion that extends between the winding drum 2a and the first pulley 3, and which is constantly elastically contacted from above. It is provided. The reverse winding detection switch 11 is arranged below and below the free end of the rope detection unit 10.

This reverse winding detecting means, in a state where the wire rope 5 is wound around the winding drum 2a, as shown in FIG.
Since the free end side of 0 is pushed up and is separated from the reverse winding detection switch 11, this switch 11 is in the ON state, and the operation of the drive unit 2 is enabled. Then, by rewinding the wire rope 5, the free end portion of the wire rope portion is brought closer to the reverse winding detection switch 11 while gradually increasing the angle of inclination of the wire rope portion, and eventually all of the wire rope 5 is wound from the winding drum 2a. Immediately before being returned, as shown in FIG.
Pushes the reverse winding detection switch 11, and this switch 1
Turn 1 off. As a result, the operation of the motor 2b is stopped, and the rewound wire rope 5 is transferred to the winding drum 2a.
It is possible to prevent reverse winding.

[0012]

In the lifting device as described above, it is necessary to make the fleet angle as small as possible in order to realize smooth alignment winding on the winding drum 2, and therefore, the drive unit 2 and the first unit. 1 It is necessary to make the distance from the pulley 3 as long as possible.

However, in the conventional structure, since the slack detecting means 9 for detecting the slack of the wire rope 5 is provided by utilizing the movement of the first pulley 3 toward and away from the drive section 2, this If the fleet angle is kept small in consideration of the arrangement space of the detection means 9, the size W of the apparatus main body 1
(See FIG. 7) becomes large, which is an obstacle when trying to downsize the device, and under the condition that the dimension W is constant, the separation distance becomes short depending on the arrangement space. Then there is the problem of having to increase the fleet angle.

Further, since it is not guaranteed that the wire rope 5 is always wound in line around the winding drum 2a, when the wire rope 5 is unwound, the behavior thereof is temporarily changed suddenly. When the wire rope 5 is returned, more specifically, the aligned winding of the wire rope 5 may be broken, and the wire rope 5 wound around the winding drum 2a may fall from the upper layer to the lower layer. This phenomenon is generally called winding collapse, and when this phenomenon occurs, the rewound wire rope 5 is vibrated.

By the way, in the conventional construction, since the slack detecting means 9 utilizes the movement of the first pulley 3 as described above, when the winding collapse occurs, the vibration at that time causes the wire rope 5 to vibrate. The first pulley 3 may be directly transmitted to the first pulley 3 via the, and the first pulley 3 may be moved, which may cause the slack detecting means 9 to malfunction.

Therefore, the first problem to be solved by the present invention is to reduce the size or the fleet angle as much as possible and to reduce the malfunction of the slack detecting means due to the collapse of the wire rope when it is unwound. It is to provide a lifting device.

Further, according to the conventional lifting device, in addition to the slack detecting means 9 for detecting the slack of the wire rope 5 and stopping the operation of the drive section 2, the space between the winding drum 2a and the first pulley 3 is provided. Reverse winding detection means for detecting the difference in the winding angle D (see FIG. 8) of the wire rope portion across the wire rope and stopping the operation of the drive unit 2 when all the wire ropes 5 are rewound (the rope detection unit 10 and the reverse winding unit). A detection switch 11) is provided. As described above, since both detections are performed by separate means, respectively, the number of parts and the number of assembling steps are large, which causes a problem that the cost is high and the structure is complicated.

Therefore, a second problem to be solved by the present invention is to solve the above-mentioned first problem and to provide an elevating device which has a simple structure and is inexpensive.

[0019]

According to the present invention, a winding drum is provided at one end side in an apparatus main body disposed at a high place on the ceiling side,
A drive unit for winding and rewinding the wire rope with respect to the drum is built in, and a first pulley for changing the direction of the wire rope into a U shape is built in the other end side of the apparatus main body, and A second pulley, which is located between the first pulley and the drive unit and which changes the direction of the wire rope passing through the first pulley downward, is built in the main body of the apparatus.
An elevating body is suspended by the wire rope passing through the second pulley, and the elevating body is moved up and down by winding and rewinding the wire rope, and the slack of the wire rope is detected to operate the drive unit. It is premised on an elevating device provided with slack detecting means for stopping.

In order to solve the first problem, the invention of claim 1 is one in which the slack detecting means is arranged between the first pulley and the second pulley.

In the present invention, the slack detecting means does not affect the disposition of the first pulley with respect to the drive section.
For example, under the condition that the size of the main body of the device is constant, the first pulley can be arranged away from the driving part as long as the space inside the main body of the device allows, so that the fleet angle can be kept small and the winding performance of the wire rope is improved. it can. Also,
Alternatively, under the condition that the fleet angle is not increased, the first pulley can be arranged close to the drive unit, and the apparatus body can be downsized accordingly. Further, according to the arrangement of the slack detecting means, the wire rope extending from the drive unit to the slack detecting means is guided in the U-shape by passing through the first pulley in the middle of the wire rope. It is possible to suppress the vibration of the rope when the collapse of the rope occurs when the rope is unwound by the first pulley, and prevent the vibration from directly affecting the slack detecting means.

In order to solve the second problem, the invention of claim 2 is characterized in that the slack detecting means includes a detection switch having an actuator, and the slack detecting means is provided with the winding drum in the maximum rewinding state. The actuator is arranged directly below the wire rope portion so as to be pushed by the wire rope portion extending between the first pulley and the first pulley.

In the present invention, the wire rope portion extending between the winding drum and the first pulley is detected by the slack detecting means when all the wire ropes are rewound (including the step immediately before that). Press the actuator of the switch to turn this switch off or on. And
At other times, that is, when the wire rope is wound around the winding drum, the wire rope portion is separated from the actuator, and the detection switch is turned on or off. Since the difference in the winding angle of the wire rope portion with respect to the winding drum is detected in this manner, the slack detecting means can also serve as the reverse winding detecting means.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. Reference numeral 21 in FIGS. 4 to 6 denotes a rectangular box-shaped device main body in which a substantially central portion of the lower surface is at least opened, and a U-shaped installation stay 22 is connected to the device main body 21 so as to straddle it. There is. The device main body 21 is connected to the elevator device installation member (not shown) provided in a high place on the ceiling side of the gymnasium through the installation stay 22, for example.

A drive section 23 is built in one end of the apparatus main body 21. As shown in FIG. 1 and the like, the drive unit 23
Is provided with a motor 24 that is capable of normal and reverse rotation and has a gear reducer, and a winding drum 25 that is normally rotated and reversely rotated by the motor 24. The winding drum 25 is provided in an upright posture, in other words, in a posture in which the winding drum (the outside diameter of which is also indicated by E in FIG. 4) is laid horizontally. In addition, 24a has shown the reduction gear box. A first pulley 26 is attached to the other end of the apparatus main body 21 in a horizontal posture. First as shown in FIG.
The height position of the pulley 26 is set to be substantially equal to the upper surface position of a rope layer (the outer periphery thereof is shown by a dotted line in FIG. 4) formed by a wire rope, which will be described later, wound around the winding drum 25.

Inside the device main body 21, an elevator holder 27 is arranged between the drive portion 23 and the first pulley 26, for example, located at the center of the device main body 21 and facing the lower surface opening of the main body 21. There is. This holder 27 has guide walls 27a at the four corners for preventing the lifting body, which will be described later, from swinging, and is located between the two guide walls 27a located on the drive unit 23 side and on the first pulley 26 side. Lock claws 28 are attached between the two guide walls 27a. These lock claws 28 are biased by a spring (not shown),
It is provided so as to be vertically rotatable within a predetermined angle range.

A second pulley 29 is arranged at the center of the apparatus main body 21 outside the lifting body holder 27. This pulley 29 is a pulley holder 30 fixed to the apparatus main body 21.
It is installed upright. The height position of the second pulley 29 is set so that the upper end of the groove thereof substantially coincides with the height of the groove of the first pulley 26.

To the winding drum 25, one end of a wire rope 31 wound and unwound on the winding drum 25 is fixed. The rope 31 is wound out from the winding drum 25 and wound about 180 ° so that the first pulley 26 can change its direction in a substantially horizontal U shape.
The second pulley 29 is wound about 90 ° and is turned downward to move up and down.

Wire rope 31 passing through the second pulley 29
The raising and lowering body 32 is suspended at the feeding portion of the. This suspension is realized through a pair of guide rollers (not shown) built in the elevation body 32 at the same height position,
A tip portion 31 a (see FIG. 1) of the wire rope 31 pulled out from the elevating body 32 is fixed to the apparatus body 21.

The elevating body 32 connects and supports an object to be elevated and lowering, for example, a lighting fixture 33 on the lower side thereof. Due to the relationship, as shown in FIG. Device terminal 34 for making an electrical connection with
And a plurality of power receiving terminals (not shown) are also provided on the upper surface. The elevating body 32 is provided with upper and lower step portions 32a and 32b at the outer surface position of the circular peripheral wall corresponding to the radial direction.

The lifting / lowering body 32 moves up, and the lifting / lowering body holder 27 is controlled while the position of the lifting / lowering body 32 is regulated by the guide wall 27a.
As it goes into the inside, the pair of lock claws 28 in the downward posture are turned upside down by the holder 27, so that the tips of these claws 28 are caught by the upper step 32a from the lower side thereof. The lifting body 32 is held at a predetermined position of the lifting body holder 27. The mechanical holding at the raised position prevents the weight of the lighting fixture 33 from being applied to the wire rope 31 and improves the durability thereof.

From the holding state in the raised position, the lifting body 3
By pulling up 2 a little, a pair of lock claws 2
8 respectively face below the lower step 32b,
At this time, the distance between the center of rotation of the lock claw 28 and the lower side of the step portion 32b becomes wider than the radius of rotation of the lock claw 28.
Therefore, the lock claw 28 is rotated downward by the spring force to release the mechanical holding state of the elevating body 32, and the lock claw 28 is in a forward posture that does not prevent the elevating body 32 from descending. Therefore, the elevating body 32 can be lowered by rewinding the wire rope 31.

A part of the lifting / lowering body 32 held by the lifting / lowering body holder 27 as described above is projected from the recess 27b between the drive portion 23 and the guide wall 27a on the side of the first pulley 26, and the wire is formed in that portion. The rope 31 moves in and out of the lifting body 32.

A slack detecting device 35 as a slack detecting means is disposed between the first pulley 26 and the second pulley 29 in the main body 21 of the apparatus. This detection device 35 is
As shown in FIGS. 1 to 3, etc., a detection device base 36,
The micro switch 37, the detection lever 38, and the coil spring 39 are provided.

More specifically, the detection device base 36 is a horizontal mounting plate portion 36 fixed to the lower surface of the ceiling wall of the device main body 21.
The first support plate portion 36b is bent downward at a right angle at one end of a, and the second support plate portion 36c facing the plate portion 36b is bent downward at a right angle at the other end to form a substantially U-shape. A spring receiving piece 36d is provided at the lower end of the first support plate portion 36b.
Is bent toward the second support plate portion 36c, and the switch attachment piece 36e is bent below the second support plate portion 36c toward the first support plate portion 36b.

Micro switch 3 as a detection switch
7 includes a switch body 37a fixed to the switch mounting piece 36e, and a lever-type actuator 40 for opening and closing a switch mechanism (not shown) in the body 37a. The switch mechanism has a normally closed contact that is opened when the actuator 40 is pushed down by a predetermined amount.
This micro switch 37 is inserted in the drive circuit of the motor 24, and when it is turned off, the current applied to the motor 24 is cut off. The actuator 40 of the switch 37 has a lever detector 40a located on the tip end side and a rope detector 40b located on the rotation base end side, and is formed in a stepped and parallel shape.

The detection lever 38 is a sheet metal bent in a U-shape and is used with its open surface facing upward. The detection lever 38 is pivoted vertically on the inner surface of the first support plate portion 36b via a pivot 41. It is installed freely. A stopper shaft 42 is provided on the free end of the lever 38. The free end portion is disposed above the spring receiving piece 36d, a coil spring 39 is stretched between them, and the lever detecting portion 40a of the actuator 40 faces the lower surface of the detecting lever 38. Are opposed to each other.
The coil spring 39 constantly urges the detection lever 38 downward, and when the detection lever 38 is pulled down by the spring force,
The detection lever 38 pushes down the lever detection unit 40a to turn off the micro switch 37.

Between the first and second support plates 36b and 36c of the detection device base 36 of the slack detection device 35 having the above structure, the winding drum 25 and the first pulley 26 in the wire rope 31 are provided.
A first wire rope portion 31b extending to the first pulley 26
And the second wire rope portion 31b extending over the second pulley 29 and the second pulley 29, respectively.

Specifically, the first wire rope portion 31a
Is passed through the detection device base 36 directly above the rope detection portion 40b of the actuator 40, detects the difference in the winding angle G (see FIG. 6) of the wire rope portion 31a, and detects all the wire ropes 31a. When the rope is rewound (including the time immediately before that), the rope detector 40b is pushed down. Also, the second wire rope portion 31
b is between the opposite side walls of the free end of the detection lever 38, and passes through the underside of the slip-off prevention shaft 42 to detect the detection base 36.
When the rope portion 31b is stretched, the detection lever 3 comes into contact with the slip-off prevention shaft 42.
8 is pulled upward against the coil spring 39, whereby the micro switch 37 is turned on.

In the lifting device having the above construction, the lifting body 32
4 shows a state in which the lighting fixture 33 has reached the raised position and is mechanically held by the lift holder 27. In this state, the power receiving terminal on the upper surface of the lift 32 and the lift holder 2 are shown.
By connecting to a power supply terminal (not shown) provided in 7,
Power can be supplied to the lighting fixture 33, and the lighting fixture 33 is lit and used in this state. Further, in the mechanically held state, the tension of the wire rope 31 has disappeared, so that the pulling force of the coil spring 39 causes the detection lever 38 to be rotationally displaced downward, and this detection lever 38
Pushes down the lever detector 40a of the actuator 40 of the micro switch 37. Therefore, the micro switch 37 is turned off.

By the way, since the electric circuit is constructed so that the microswitch 37 can be bypassed and activated only when the motor 24 of the drive unit 23 is activated, the elevator 32 is lowered to maintain the lighting fixture 33. For example, when the wire rope 31 is first wound up, the lifting and lowering body 32 is pulled up to remove the lock claw 28 from the upper step 32a of the lifting and lowering body 32 as described above. Since the second wire rope portion 31b is stretched and rotated so as to pull up the detection lever 38, the lever 38 is separated above the lever detection portion 40a, and as a result, the micro switch 37 is turned on.
Further, since the weight of the lighting device 33 is added to the wire rope 31 at the same time when the lock claw 28 is unlocked, the micro switch 37 is held in the ON state.

In such a state, since the motor 24 can change the rotation direction so as to rewind the wire rope 31, the elevator 32 unlocked by the lock claw 28 is lowered to the floor H side together with the lighting fixture 33. You can
Then, when the lighting fixture 33 is placed on the floor surface E as shown in FIG. 5, the wire rope 31 loosens and the tension of the second wire rope portion 31b disappears. The detection lever 38 is rotationally displaced downward. Therefore, the detection lever 38 pushes down the lever detection portion 40a of the actuator 40 of the micro switch 37 to turn off the micro switch 37. That is, the slack detection device 35 detects the slack as described above, and immediately after the lighting fixture 33 reaches the floor surface H, the drive unit 23 is stopped.
The operation of the motor 24 can be automatically stopped.

By the way, the wire rope 31 is normally used with a standard length of 15 m. Even when the lifting device is mounted at a ceiling position higher than this length, the wire unwound to the maximum extent. It is possible to prevent the rope 31 from being reversely wound around the winding drum 25 and the lighting fixture 33 again rising to the ceiling side for the following reason.

That is, in a normal state, the wire rope 3
The first wire rope portion 31a of 1 is opposed to the upper side of the rope detection portion 40b of the actuator 40 of the micro switch 37 at a distance, but when the wire rope 31 is completely unwound, as shown in FIG. Since the inclination of the 1-wire rope portion 31a becomes steep and the entire portion 31a is displaced further downward, the rope portion 31a pushes down the rope detection portion 40b of the actuator 40,
The micro switch 37 is turned off. Therefore, the reverse winding detection by the slack detecting device 35 automatically stops the operation of the motor 24 of the drive unit 23 immediately after the detection, so that the reverse winding of the wire rope 31 can be prevented.

The slack detecting device 35, which detects slack as described above, detects the reverse winding by using the micro switch 37 which is a necessary structure for detecting the slack.
In this lifting device, it is not necessary to provide a reverse winding detection device in addition to the slack detection device 35. Therefore, the number of parts and the number of assembling steps of the entire lifting device are reduced, so that the lifting device can be obtained at low cost and the structure of the entire lifting device can be simplified.

To place the lighting fixture 33 in the raised position after maintenance, it is sufficient to rotate the winding drum 25 in the direction in which the wire rope 31 is wound.
Immediately, the weight of the lighting fixture 33 is applied to the wire rope 31, and the micro switch 37 of the slack detecting device 35 returns to the ON state, so that the raising operation of the lighting fixture 33 can be continued together with the elevating body 32. Then, the lifting body 32
And when the lighting fixture 33 is raised to a predetermined raised position,
As described above, the lift 32 is mechanically held by the lift holder 27. Thus, the lifting body 32 and the lighting fixture 33
FIG. 4 shows the state in which the is arranged in the raised position.

In the lifting device for lifting the lifting body 32 and the lighting fixture 33 as described above, the slack detecting device 35 is arranged between the first pulley 26 and the second pulley 29. 35 does not affect the arrangement of the first pulley 26 with respect to the drive unit 23. In other words, the first pulley 26 is arranged as close as possible to the other end wall 21b (see FIGS. 4 to 6) of the device body 21 farthest from the drive unit 23 without being restricted by the slack detecting device 35. Then, the separation distance I between the drive unit 23 and the first pulley 26
(See FIG. 4) can be secured.

Therefore, under the condition that the size of the apparatus body 21 (the dimension in the longitudinal direction thereof is indicated by J in FIG. 4) is constant, as far as the space in the apparatus body 21 allows, the drive unit 23 to the first pulley 26 can be used. Can be placed apart. As a result, the fleet angle can be kept small, so the wire rope 3
The winding performance of No. 1 can be improved. Alternatively, under the condition that the fleet angle is not increased (in other words, the angle is the same as the conventional condition), the first pulley 26 can be arranged close to the drive unit 23, and the device body 21 can be correspondingly arranged. It can be made compact, and therefore the entire lifting device can be made compact. Such downsizing is naturally useful for cost reduction and weight reduction, which is effective in facilitating the installation work of the entire lifting device on a high ceiling.

Moreover, according to the arrangement of the slack detecting device 35 described above, the wire rope 31 extending from the drive unit 23 to the slack detecting device 35 changes its direction into a U shape here via the first pulley 26. Therefore, the first pulley 26 can suppress the vibration of the first wire rope portion 31a when the wire collapse occurs when the wire rope 31 is unwound. Therefore, the vibration associated with the collapse of the winding is prevented from directly affecting the slack detecting device 35, and the malfunction of the slack detecting device 35 due to the collapse of the winding can be reduced.

The present invention is not limited to the first embodiment. For example, the micro switch 37 may be turned on when pushed down by the detection lever 38 or the first wire rope portion 31a, contrary to the first embodiment, and the output signal of the switch 37 is output to the motor. Input to the control circuit, and the motor 24
The operation of may be controlled as described above.

[0051]

As described in detail above, the present invention has the following effects.

According to the lifting and lowering device of the first aspect of the invention,
Since the slack detecting means does not affect the arrangement of the first pulley with respect to the drive unit, under the condition that the size of the apparatus main body is constant, the first pulley can be arranged as far away from the drive unit as space in the apparatus main body allows. In addition, the fleet angle can be made small, and under the condition that the fleet angle is not made large, the first pulley can be arranged close to the drive unit, so that the device body can be made compact. Moreover, since the first pulley suppresses the vibration of the rope when the wire collapse occurs when the wire rope is unwound, it is possible to prevent the vibration from directly propagating to the slack detecting means. The malfunction of the means can be reduced.

Further, in the lifting device according to the second aspect of the present invention, the slack detecting means can also serve as the reverse winding detecting means, so that the number of parts and the number of assembling steps can be reduced, the structure can be simplified and the cost can be reduced. Obtainable.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a configuration of a main part of an elevating device according to a first embodiment of the present invention.

FIG. 2 is an enlarged perspective view showing a Z portion in FIG.

3 is a diagram showing the configuration of a slack detecting means included in the lifting device shown in FIG. 1 as viewed from the direction of the YY line in FIG.

FIG. 4 is a schematic cross-sectional view showing the configuration of the lifting device according to the first embodiment in a state where the lifting body is elevated and arranged on a high ceiling.

FIG. 5 is a schematic partial cross-sectional view showing the configuration of the lifting device according to the first embodiment in a slack detection state.

FIG. 6 is a schematic cross-sectional view showing the configuration of the lifting device according to the first embodiment in a reverse winding detection state.

FIG. 7 is a schematic cross-sectional view showing a configuration of a lifting device according to a conventional example in a state where the lifting body is elevated and arranged on a high ceiling.

FIG. 8 is a schematic cross-sectional view showing a configuration of a lifting device according to the conventional example in a reverse winding detection state.

FIG. 9A is a schematic partial cross-sectional view showing the configuration of the lifting device according to the conventional example in a state where the lifting body is being lowered. (B)
FIG. 3 is a schematic partial cross-sectional view showing a configuration of a lifting device according to the conventional example in a looseness detection state.

[Explanation of symbols]

 21 ... Device main body, 23 ... Drive part, 24 ... Motor, 25 ... Winding drum, 26 ... 1st pulley, 29 ... 2nd pulley, 31 ... Wire rope, 31a ... 1st wire rope part, 31b ... 2nd wire Rope portion, 32 ... Elevating body, 33 ... Lighting equipment (object to be lifted), 35 ... Looseness detection device (looseness detection means), 36 ... Detection device base, 37 ... Micro switch (detection switch), 38 ... Detection lever, 39 ... coil spring, 40 ... micro switch actuator, 40a ... actuator lever detection unit, 40b ... actuator rope detection unit.

Continuation of front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display area F21V 21/36 F21V 21/36 E

Claims (2)

[Claims] 1. A winder drum is provided at one end side in an apparatus main body arranged at a high place on the ceiling side, and a drive unit for winding and rewinding a wire rope with respect to the drum is built-in.
A first pulley that changes the direction of the wire rope into a U-shape is built into the other end side of the device main body, and the first pulley is located between the first pulley and the drive unit and is disposed in the device main body. A second pulley for turning the wire rope passing through the first pulley downward is incorporated, and a lifting body is suspended by the wire rope passing through the second pulley, and the lifting body is wound around the wire rope.・ Rewind to raise and lower,
In a lifting device provided with slack detecting means for detecting the slack of the wire rope and stopping the operation of the drive part, the slack detecting means is provided between the first pulley and the second pulley. An elevating device characterized by being arranged. 2. The slackness detecting means includes a detection switch having an actuator, and the actuator is pushed by a wire rope portion extending between the winding drum and the first pulley in a maximum rewinding state of the wire rope. The elevating device according to claim 1, wherein the actuator is arranged so as to face directly below the wire rope portion so as to be provided.