JPH1173812A - Lifting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a lifting object stop at an accurate descending position. SOLUTION: A winding drum 16 on which a rope 15 is wound is provided. A driving part 11 to rotate the winding drum 16 is provided. A pulley 17 around which the rope 15 to be wound on the winding drum 16 is wrapped is provided so as to rotate corresponding to winding and paying-out of the rope 15 operated by the winding drum 16. A stoppage means 23 is provided to stop the driving part 11 through detection such that the rope 15 has payed out in the fixed length corresponding to the rotational quantity of the pulley 17 when the rope is payed out from the winding drum 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevating device for elevating an object suspended from a cable.

[0002]

2. Description of the Related Art Conventionally, in the case of a lighting fixture installed at a high place such as a high ceiling such as a gymnasium, the lighting fixture is raised and lowered so that the maintenance of the lighting fixture can be easily performed near the floor. A lifting device is used.

In this elevating device, a cable such as a wire rope from which a lighting device is suspended is wound around a winding drum.
The winding apparatus is rotated by a motor, and the rope is extended or wound to lower or raise the lighting fixture. In such an elevating device, usually, when the luminaire is lowered by pulling out the rope from the winding drum by driving a motor, it is detected that the rope becomes loose when the luminaire reaches the floor surface. And an automatic stop function for stopping the motor.

[0004] However, such an automatic stop function of detecting a slack of a cable and stopping a motor is not suitable for a decorative luminaire such as a chandelier. That is, in a highly decorative chandelier using, for example, a glass pipe, a bead, or a chain, even when the tip reaches the ground, the cable does not loosen, and the chandelier continues to descend as it is, and the chandelier may be damaged.

[0005] Therefore, in the case of a decorative luminaire such as a chandelier, for example, as described in Japanese Utility Model Publication No. 3-30966, when the rope is pulled out from the winding drum, the winding drum is not moved. An elevating device that stops the descent of the lighting fixture by detecting that the cord has been extended by a predetermined amount in accordance with the rotation amount is used, or the lighting fixture does not reach the floor length of the cord. Or a lifting / lowering device with a timer function for stopping the lighting after a predetermined time from the start of the lowering of the lighting fixture. In any of these cases, breakage of the lighting fixture can be prevented by setting the lighting fixture to stop descending before reaching the floor.

[0006]

However, in the lifting device described in Japanese Utility Model Publication No. 3-30966,
Depending on how the rope is wound on the winding drum, the amount of rotation of the winding drum and the amount of unwinding of the rope do not match, the descending position of the lighting fixture cannot be set accurately, and the length of the rope is reduced. With the adjusted lifting device, it is not possible to make adjustments at the construction site due to price and delivery problems because the cord is a special order.In addition, with the lifting device with a timer function, after a predetermined time set by the timer Even when the lowering of the lighting fixture is stopped, there is a problem that the lowering position where the lighting fixture actually descends varies.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a lifting device capable of stopping an object to be raised and lowered at an accurate lowering position.

[0008]

According to a first aspect of the present invention, there is provided an elevating device, in which a winding drum on which a cable is wound, a driving unit for rotating the winding drum, and the winding drum. A pulley on which a rope is wound and which rotates in response to winding and unwinding of the rope by the winding drum, and a rope corresponding to the amount of rotation of the pulley when the rope is extended from the winding drum. And stopping means for detecting that a predetermined amount has been fed out and stopping the driving unit.

[0009] Since the amount of rotation of the pulley that is rotated by the unwinding of the rope from the winding drum accurately corresponds to the amount of unwinding of the rope, that is, the descending position of the object to be raised and lowered, when the rope is unreeled from the winding drum. By detecting that the rope has been extended by a predetermined amount in accordance with the rotation amount of the pulley and stopping the driving unit, the object to be raised and lowered can be stopped at an accurate lowering position.

The lifting device according to a second aspect of the present invention is the lifting device according to the first aspect, further comprising a power terminal for connecting a power line, the stopping means is disposed near the power terminal, and the pulley rotates. It has an adjusting means for adjusting an amount of feeding of the rope corresponding to the amount.

Since the stopping means having the adjusting means is disposed near the power supply terminal, the work of connecting the power supply line to the power supply terminal and the adjusting work of the adjusting means can be easily performed, and the elevating device is installed. Workability at high places can be improved.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the lifting device according to the present invention will be described below with reference to the drawings.

FIG. 1 is a bottom view of the lifting / lowering device, FIG. 2 is a front view of the lifting / lowering device, FIG. 3 is a side view of the lifting / lowering device, FIG. 4 is a perspective view of the lifting / lowering device, and FIG. FIGS. 7A to 7D are explanatory diagrams for explaining the accompanying elevating operation.

In FIG. 4, reference numeral 1 denotes a lifting / lowering device main body, and 2 denotes a lifting / lowering portion which is raised and lowered with respect to the lifting / lowering device main body 1.

The elevating device main body 1 is fixedly installed on a structure such as a high ceiling, and includes a chassis 3, an installation member 4 installed on the structure to support the chassis 3, and a box covering the lower surface of the chassis 3. An opening 6 is formed at the center of the lower surface of the cover 5 so that the elevating part 2 can enter.

A lighting fixture 7 such as a chandelier is attached to the elevating unit 2 as an object to be elevated.

1 to 3, a motor 11 and a speed reducer 12 as a drive unit are mounted on a lower surface of the chassis 3 by a bracket 13. A take-up drum 16 for winding a cable 15 such as a wire rope is attached to an output shaft 14 of the speed reducer 12. The leading end of the cable 15 is led out substantially horizontally along the lower surface of the chassis 3 and is folded back through a first pulley 17 as a pulley, and through a second pulley 18 in a substantially central region of the chassis 3. Lifting part 2 which is led out downward
It is connected to.

The first pulley 17 is rotatably supported by a shaft 20 inside a pulley holder 19 having a substantially U-shaped cross section. The first pulley 17 is attached to the lower surface of the chassis 3 with the pulley holder 19.

The second pulley 18 is, like the first pulley 17,
A pulley holder 21 having a substantially U-shaped cross section is rotatably supported by a shaft 22 inside a pulley holder 21.
It is attached to the lower surface of.

The first pulley 17 detects that the rope 15 has been extended by a predetermined amount corresponding to the rotation amount of the first pulley 17 when the rope 15 is extended from the winding drum 16. Motor 11
Is provided correspondingly.

The stopping means 23 has a screw shaft 24, one end of which is integrally connected to the shaft 20 of the first pulley 17, and the other end of which is attached to the lower surface of the chassis 3. Support plate
It is rotatably supported by 25 support pieces 26. Support plate 25
Are arranged parallel to the screw shaft 24 and along one side of the chassis 3, and a guide groove 27 is formed facing the screw shaft 24. An operation plate 28 is screwed into the screw shaft 24, and the operation plate 28 is slidably engaged with the guide groove 27 and protrudes from the outer surface of the support plate 25.

On the outer surface side of the support plate 25, a micro switch 29 is provided so as to face the operation plate 28. The micro switch 29 includes a switch body 30 and the switch body.
It has a switch operator 31 protruding from 30, and is turned on when the operation plate 28 is separated from the switch operator 31,
It is configured to be turned off when the switch operator 31 is pushed by the operation plate 28.

The switch body 30 is mounted on a slide table 32 slidably engaged along the guide groove 27. An adjusting screw 33 is inserted into the slide base 32 from the outer surface side, and the adjusting screw 33 is screwed into a nut 34 arranged on the inner surface side of the support plate 25 through the guide groove 27.
, The slide table 32 is fixed to the support plate 25. The guide groove 27, the guide base 32, the adjusting screw 33, and the like constitute an adjusting means 35 that can adjust and set the amount of the wire 15 that is fed in accordance with the amount of rotation of the first pulley 17.

A micro switch 29 is provided above the guide groove 27.
A scale 36 is displayed as a guide for position adjustment.

The second pulley 18 is provided with a slack detecting means 37 for detecting the slack of the cable 15. The looseness detecting means 37 has a micro switch 38 disposed outside the pulley holder 21, and the detection lever 39 of the micro switch 38 is disposed in contact with the lower side of the shaft 22 of the second pulley 18. ing. The shaft 22 of the second pulley 18 is vertically slidable with respect to the pulley holder 21 within a predetermined range, and is urged upward by a spring 40. The microswitch 38 is configured to be turned on when the detection lever 39 is pressed downward by the shaft 22, and to be turned off when the shaft 22 is raised and the detection lever 39 is raised.

The support plate 25 is provided with a power supply terminal 41 for supplying power to the motor 11 and a power supply terminal 42 for supplying power to the lighting fixture 7. Therefore, the adjusting means 35 of the stopping means 23 and the power supply terminals 41 and 42 are arranged in the vicinity.

An operation panel (not shown) for operating the elevating device is disposed near the floor, and the operation panel is provided with an up switch and a down switch. There are provided two feeder circuits for raising and lowering the motor 11, which are closed by the up switch and the down switch.

Microswitches 29 and 38 are provided in the descending power supply circuit. When these microswitches 29 and 38 are turned on, the power supply circuit is closed to allow power supply to the motor 11. Then, the power supply circuit is opened by turning off the micro switches 29 and 38 to cut off the power supply to the motor 11.

In the ascending power supply circuit, a limit switch (not shown) for turning off the ascending / descending portion 2 at a position where the ascending / descending portion is elevated to a predetermined position and opening the ascending power supply circuit is wired. This limit switch is attached to the lifting device main body 1 side.

Next, the operation of the present embodiment will be described.

As shown in FIG. 5 (a), when the lighting fixture 7 suspended via the elevating unit 2 is raised to a predetermined height, most of the cable 15 is on the winding drum 16. The operation plate 28 is moved to a position closer to the first pulley 17, away from the microswitch 29, and
29 is on. Further, the load of the lifting unit 2 and the lighting fixture 7 is applied to the cable 15, the second pulley 18 descends against the bias of the spring 40, and the detection lever 39 of the micro switch 38 is moved by the shaft 22. It is depressed, and the micro switch 38 is in the ON state. Therefore, since these microswitches 29 and 38 are both in the ON state, it is possible to supply power to the motor 11 in the power supply circuit for descending.

When the lighting fixture 7 is lowered to perform maintenance or the like, when the lowering switch of the operation panel is operated, the lowering power supply circuit is closed, the motor 11 is driven, and the winding drum 16 is moved in the feeding direction. Is rotated. The rotation of the winding drum 16 in the unwinding direction causes the rope 15 to
The lighting device 7 is drawn out from the lifter 16 and drawn out of the lifting device main body 1 via the first pulley 17 and the second pulley 18, and the lighting fixture 7 is lowered together with the lifting unit 2 (see FIG. 5B).

When the first pulley 17 rotates with the engagement movement of the cable 15, the screw shaft 24 is rotated integrally with the first pulley 17, and the operation plate 28 screwed to the screw shaft 24 is micro-sized. It is moved toward the switch 29 in the approaching direction.

As shown in FIG. 5 (c), when the lighting fixture 7 is lowered close to the floor, the switch plate 31 is actuated by the operation plate 28.
Is pressed, the microswitch 29 is turned off, the power supply circuit for lowering is opened, the motor 11 is automatically stopped, and the lowering of the lighting fixture 7 is stopped.

At this time, the amount of rotation of the first pulley 17 which is rotated by the unwinding of the rope 15 from the winding drum 16 accurately corresponds to the amount of unwinding of the rope 15, that is, the lowered position of the lighting fixture 7. I have. Therefore, by appropriately adjusting the mounting position of the micro switch 29 with respect to the support plate 25, that is, by appropriately adjusting the position where the micro switch 29 is turned off by the operating plate 28, the lighting fixture 7 is provided.
Is stopped at the set exact lowering position.

On the other hand, when the raising switch of the operation panel is operated to raise the lighting fixture 7 after the maintenance, the power supply circuit for raising is closed, the motor 11 is rotated in the reverse direction, and the winding drum 16 is moved in the winding direction. Is rotated. This winding drum 16
In the winding direction, the cable 15 is wound around the winding drum 16 via the second pulley 18 and the first pulley 17, and the lighting fixture 7 is raised together with the lifting unit 2.

When the first pulley 17 is rotated in accordance with the engagement movement of the cable 15, the screw shaft 24 is rotated integrally with the first pulley 17, and an operation plate 28 screwed to the screw shaft 24. Is moved in a direction away from the microswitch 29. With the movement of the operation plate 28, the pressing of the switch operator 32 is released, the micro switch 29 is turned on, and the power supply to the motor 11 is allowed in the lowering power supply circuit.

When the lighting fixture 7 is raised to a predetermined height,
A limit switch (not shown) is pushed by the elevating unit 2, the power supply circuit for ascending is opened, the motor 11 is automatically stopped, and the lighting fixture 7 is stopped from ascending (see FIG. 5D).

While the lighting fixture 7 is descending, the lighting fixture 7 reaches the set down position and the microswitch 29
If the lighting fixture 7 is caught by, for example, an object placed on the floor surface and the descent is prevented before turning off, the rope 15 is slackened. The shaft 22 of the second pulley 18 is raised by the bias of 40
Is released, the micro switch 38 is turned off, the power supply circuit for lowering is opened, the motor 11 is automatically stopped, and the lowering operation of the lighting fixture 7 is stopped. When the cable 15 is wound around the winding drum 16 and the cable 15 is no longer loose, the second pulley 18 is lowered and the micro switch 38 is turned on. Is allowed.

As described above, the amount of rotation of the first pulley 17 which is rotated by the unwinding of the cable 15 from the winding drum 16 accurately corresponds to the amount of unwinding of the cable 15, that is, the lowered position of the lighting fixture 7. Therefore, when the cable 15 is extended from the winding drum 16, the motor 11 is stopped by detecting that the cable 15 has been extended by a predetermined amount corresponding to the rotation amount of the first pulley 17. The instrument 7 can be stopped at the correct lowered position. Therefore, the present invention can be applied to a lighting device 7 having a high decorative property such as a chandelier.

Further, the stopping means 23 having the adjusting means 35 for adjusting the feeding amount of the rope 15 corresponding to the rotation amount of the first pulley 17 is disposed near the power supply terminal portions 41 and 42. Did
Along with the work of connecting the power supply lines to the power supply terminals 41 and 42, the adjustment of the position of the microswitch 29 by the adjusting means 35, that is, the adjustment of the lowering position of the lighting fixture 7, can be easily performed, and the workability at a high place where the lifting device is installed Can be improved.

As the stopping means 23, any method and structure can be used as long as the extension of the cable 15 can be detected from the rotation of the pulley. For example, a micro switch 29 for opening and closing a power supply circuit for lowering the motor 11 can be used. Including the operating plate 28
And a control unit for stopping and controlling the motor 11 based on a detection signal of the detection unit or a switch for opening and closing a power supply circuit for lowering the motor 11 based on a detection signal of the detection unit. A configuration may be used.

[0043]

According to the first aspect of the present invention, the amount of rotation of the pulley that is rotated by the unwinding of the rope from the winding drum accurately corresponds to the amount of unwinding of the rope, that is, the descending position of the object to be raised and lowered. When the rope is extended from the winding drum, the drive unit is stopped by detecting that the rope has been extended by a predetermined amount in accordance with the amount of rotation of the pulley, so that the object to be lifted and lowered can be accurately lowered. Can be stopped in position.

According to the lifting device according to the second aspect, in addition to the effect of the lifting device according to the first aspect, there is provided an adjusting means that can adjust the extension amount of the rope corresponding to the rotation amount of the pulley. Since the stopping means is disposed near the power supply terminal, the work of connecting the power supply line to the power supply terminal and the adjustment of the adjusting means can be easily performed, and the workability at a high place where the lifting device is installed can be improved. .

[Brief description of the drawings]

FIG. 1 is a bottom view of a lifting device showing an embodiment of the present invention.

FIG. 2 is a front view of the lifting device.

FIG. 3 is a side view of the lifting device.

FIG. 4 is a perspective view of the lifting device.

5 (a) to 5 (d) are explanatory diagrams illustrating a lifting / lowering operation accompanying maintenance of a lighting fixture by the lifting / lowering device.

[Explanation of symbols]

 11 Motor as drive unit 15 Cable 16 Winding drum 17 First pulley as pulley 23 Stopping means 35 Adjusting means 41, 42 Power supply terminal

Claims (2)

[Claims] 1. A winding drum on which a rope is wound, a driving unit for rotating the winding drum, and a rope wound on the winding drum, wherein the rope is wound by the winding drum. A pulley that rotates in response to winding and unwinding of the cable; and, when the cable is unwound from the winding drum, detects that the rope has been unwound a predetermined amount in accordance with the amount of rotation of the pulley. And a stopping means for stopping the section. 2. An adjusting means comprising a power terminal part for connecting a power line, and a stopping means arranged near the power terminal part, the adjusting means being capable of adjusting a feeding amount of the cable corresponding to a rotation amount of the pulley. The lifting device according to claim 1, further comprising: