JPH07122111A - Electric elevation device - Google Patents

Abstract

PURPOSE:To install a device mainframe on a ceiling in a preset range of inclination by disabling the elevation of an elevator when the device mainframe is installed on the ceiling in the condition that it is out of a preset range of inclination and clearly informing that the device mainframe is installed out of a preset range of inclination. CONSTITUTION:When a device mainframe 1 mounted on a mainframe mounting 2 is inclined at an angle beyond a limit, the value of voltage output from a sensor 21 exceeds a preset magnitude corresponding to the inclination limit of the device mainframe 1 to close a contact 22. Then, a relay 23 is electrified to open a contact 24. An electric circuit via which a motor 5 and a power supply are connected together is thus opened to prohibit the drive of the motor 5 if an operator operates a positive-reverse run change-over switch 14 and the elevation of a lighting equipment 10. The operator is aware that the equipment mainframe 1 is inclined at an angle beyond a limit to a horizontal line. In this way, the device mainframe 1 is installed on a ceiling in a preset range.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric hoist for elevating and lowering an electric device such as a lighting fixture and a speaker which can be hoisted on a high ceiling such as a ceiling in a factory or a gymnasium or a place close to the high ceiling. Regarding the device.

[0002]

2. Description of the Related Art As an electric hoisting device used for this kind of application, a device main body equipped with a drum for winding and unwinding a wire rope and an electric motor for rotationally driving this drum, and a device mounted on a ceiling-side high place A body mounting tool for tightening and holding the device body with a tightening member such as a screw along a horizontal axis, and an elevating device that is supported by the wire rope and is hung from the device body and is moved up and down by winding and unwinding the wire rope. Some include a body and an electric device such as a lighting fixture connected to the lifting body.

In this electric hoisting device, in order to normally move the hoisting body up and down, it is necessary that the device body be in a horizontal position. By the way, in this electric lifting device, since the lifting body is held by the horizontal tightening member and is attached to the main body attaching tool, the device main body moves in a vertical plane centered on the tightening member and perpendicular to the tightening member. Since it rotates and tilts, it is possible to adjust the tilt position of the apparatus main body with respect to the horizontal line depending on the tightening condition of the bolt.

For this reason, when the apparatus main body is held by the tightening tool and attached to the main body mounting tool when the electric lifting device is installed on the ceiling, the apparatus main body is in a vertical plane orthogonal to the tightening member. Position, or adjust the position so that it falls within the range of the limit angle of tilt (eg ± 2 ° with respect to the horizontal line) that does not hinder the performance of the electric lifting device, and tighten the tightening member in that state to tighten the device body. It is necessary to fix the so as not to rotate and attach it to the main body fixture.

Conventionally, in order to adjust the position of the main body of the apparatus, a level is provided in the main body of the apparatus, and the position of the main body of the apparatus is adjusted by moving the main body of the apparatus based on the indication of the level. There is.

[0006]

However, such a conventional electric lifting device has the following problems.
That is, when installing the electric lifting device on the ceiling or the like, the level of the device is used as a guide to level the device main body, or the limit angle of inclination that does not hinder the performance of the electric lifting device ( For example, when adjusting the position so that it falls within the range of ± 2 ° with respect to the horizontal line, the level cannot fully respond to detect the horizontal state of the device body. Even if the main body of the device cannot be adjusted in a horizontal position, the main body of the device is tilted out of the range of the limit angle of tilt. There are times when you are told.

When the operator drives the electric motor to move the lifting body up and down without knowing that the operator is mounted on the ceiling in a tilted state outside the range of the tilt limit angle. In some cases, the lifting operation may be defective. For example, when lowering the lifting body that has been raised to the apparatus body, a problem may occur and the lowering of the lifting body may stop halfway.

Further, in a device in which a lighting fixture is connected to an elevating body, a power feeding electrode is provided in the device body and a power receiving electrode is provided in the elevating body, and the elevating body is raised to the position of the device body so that both electrodes are There is a device in which electric power is supplied from a power source to a lighting device in a contact state to turn on a light bulb, and when an elevating body descends, both electrodes are separated to turn off the light bulb. In the case of this type of device, when the descending lift is raised to the position of the device main body, the positions of both electrodes may be displaced and they may not come into contact with each other, and the bulb may not be lit.

The present invention has been made in view of the above circumstances. When the apparatus body is mounted on the ceiling or the like in a tilted state outside a predetermined range, the lifting / lowering body cannot be lifted and the apparatus body is tilted and mounted. It is an object of the present invention to provide an electric lifting device capable of clearly knowing that the device main body is mounted, and thus capable of mounting the device body on a ceiling or the like within a range of a predetermined inclination.

[0010]

In order to achieve the above object, an electric hoisting device of the present invention comprises a drum for winding and unwinding a wire rope, a device main body equipped with an electric motor for rotationally driving the drum, and a ceiling. A body mounting tool which is attached to a side high place and in which the apparatus body is held and attached by a fastening member along a horizontal axis, and a winding and unwinding of the wire rope which is supported by the wire rope and hung from the apparatus body. And an electric device connected to the elevating body, an electric device connected to the elevating body, which is provided in the device main body, and the electric power is supplied to the electric motor when the device main body pivots around the tightening member and tilts. And a switch for opening an electric circuit connecting with a power supply for supplying the electric power.

[0011]

The device main body is horizontal in a vertical plane orthogonal to the tightening member, or is out of the range of the tilt limit angle (for example, ± 2 ° with respect to the horizontal line) that does not hinder the performance of the electric lifting device. When it is attached to the main body fixture in a tilted state, the switch provided on the main body of the device opens to open the electric circuit connecting the electric motor and the power supply. Can not be
The lifting / lowering operation of the lifting / lowering body becomes impossible.

Therefore, when the electric lifting device is attached to a high place on the ceiling side of a building, if the device main body is tilted and is attached to the main body attaching tool by mistake, the lifting body is automatically moved. By making it impossible to move up and down, the worker can clearly know that the work is wrongly executed.

Therefore, in order to allow the lifting / lowering body to be lifted / lowered, the apparatus main body is placed horizontally on the main body fixture, or the tilt is within a limit angle range of the tilt which does not hinder the performance of the electric lifting apparatus. Since it is necessary to adjust the position like this and redo the construction, it is possible to prevent the construction from ending with the equipment body tilted and attached to the main body mounting tool, so that the equipment body can be leveled or the performance of the electric lifting device can be improved. It can be mounted on the ceiling, etc. with an inclination that falls within the range of the limit angle of inclination that does not hinder. And
It is possible to obviate the occurrence of the lifting / lowering operation failure of the lifting / lowering body when the apparatus body is tilted.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIGS.

This embodiment is intended for an electric lifting device for connecting a lighting device to a lifting body and lifting it. 1 and 2, reference numeral 1 denotes a box-shaped device main body, and the device main body 1 is installed on a high ceiling R in a building such as a factory or a gymnasium by a main body mounting tool 2 and enters. The main body attachment 2 has a gate shape having a pair of vertically extending leg portions 2a at opposite positions, and is fixed to the ceiling R by bolts 15.

The apparatus main body 1 is arranged in a portion sandwiched by a pair of leg portions 2a of the main body mounting tool 2, and the pair of leg portions 2a and a pair of side walls 1a of the apparatus main body 1 are horizontally bolted respectively. 3 through each of these bolts 3 and nuts 4
The apparatus main body 1 is attached to the main body attachment 2 by screwing each of them together and tightening each of the bolts 3 and the nuts 4. The position where the bolt 3 is inserted into the side wall 1a of the apparatus body 1 is the center of the side wall 1a in the length direction.

In this case, when the bolt 3 is loosely tightened, the device body 1 rotates about the bolt 3 in the vertical plane orthogonal to the axis of the bolt 3 about the bolt 3. It is possible to That is, the tilt position of the apparatus body 1 with respect to the horizontal line can be adjusted by the degree of tightening of the bolt 3.

An electric motor 5 and a winding drum 7 for rotating the wire rope 6 forward and backward by the electric motor 5 to wind and unwind the wire rope 6 are mounted inside the apparatus main body 1. The wire rope 6 is supported and laid around by a guide 8 provided in the apparatus main body 1, and suspends and holds an elevating body 9 below the apparatus main body 1. The lifting body 9 is connected to an electric device, for example, a lighting device 10. And
The lighting fixture 10 can be moved up and down by winding and unwinding the wire rope 6 by the winding drum 7.

An upper limit switch (not shown) is provided in the apparatus main body 1, and when the elevating body 9 is moved up and down, the elevating body 9 pushes the switch to stop the driving of the electric motor 5 for rotating the drum 7 in the winding direction. Has become. Further, a lower limit sensor is provided in the apparatus main body 1, and this sensor detects that the lighting fixture 10 has reached the floor surface and the wire rope 6 has loosened when the lifting body 9 descends, and the drum 7 is wound in the winding direction. The drive of the rotating electric motor 5 is stopped.

Further, the apparatus body 1 is provided with a power supply contact 11 connected to a power source, and the lifting body 9 is provided with a power receiving contact 12 connected to a lighting fixture 10. Both contacts 11 and 12 come into contact with each other when the temperature rises to 0, and the lighting fixture 10 receives power from the power source and is turned on.

Further, a switch 13 is attached to the center of the upper surface of the apparatus body 1. The switch 13 is incorporated in an electric circuit that connects the electric motor 5 and a power supply that supplies electric power to the electric motor 5, as will be described later.
The main body 1 of the apparatus rotates about a bolt 3 in a vertical plane orthogonal to the axis of the bolt 3 and operates when tilted with respect to the horizontal line to open an electric circuit connecting the electric motor 5 and a power source.

The switch 13 is closed when the tilt angle of the device body 1 with respect to the horizontal line is within a range (tilt limit value) that does not affect the performance of the electric lifting device. , An electric circuit connecting the electric motor 5 and the power source is closed. However, when the angle of inclination of the device body 1 with respect to the horizontal line exceeds the limit value, the opening operation is performed to open the electric circuit connecting the electric motor 5 and the power supply.

For example, when the inclination angle of the apparatus main body 1 with respect to the horizontal line is up to 2 °, the performance as an electric lifting device is not affected, and when the tilt angle exceeds 2 °, the performance as an electric lifting device is affected. If so, the device body 1
The electric circuit is closed by not operating up to an inclination angle of 2 ° with respect to the horizontal line, and when the inclination angle exceeds 2 °, it opens to open the electric circuit connecting the electric motor 5 and the power supply. It is like this.

The electric circuit connecting the electric motor 5 and the power source is shown in FIG.
As shown in, the stator winding of the electric motor 5 is connected to the power source G via the forward / reverse changeover switch 14 and the tilt switch 13. The normal / reverse rotation changeover switch 14 is for rotating the electric motor 5 in the normal or reverse direction in order for the operator to lower or raise the lighting fixture 10. Here, the electric motor 5 and the switch 13 are provided in the apparatus main body 1, and the forward / reverse rotation changeover switch 14 is operated by an operator. Therefore, the electric motor 5 and the switch 13 are provided separately from the apparatus main body 1, for example, in a wall portion of a building. ing. A starting capacitor C is connected to the electric circuit in parallel with the electric motor 5.

The operation of the thus-configured electric lifting device will be described.

Installation of the electric lifting device on the ceiling R is performed, and the device main body 1 is attached to the main body fixture 2 fixed to the ceiling R.
When the device main body 1 is positioned horizontally as shown in FIG. 4 when the is installed, or when the device main body 1 rotates about a bolt 3 in a vertical plane orthogonal to the axis of the bolt 3, If the tilt angle is within the range of the tilt limit value even if the switch 13 is tilted with respect to, the switch 13 is closed.

Therefore, in this case, the electric circuit connecting the electric motor 5 and the power source G is closed, and when the operator operates the forward / reverse changeover switch 14, the electric motor 5 which receives the electric power from the power source G is driven. The lighting device 10 can be moved up and down. Thereby, the operator can clearly know that the apparatus main body 1 is attached to the main body attaching tool 2 horizontally or at an inclination angle within the range of the inclination limit value.

When the electric lifting device is installed on the ceiling R and the device main body 1 is attached to the main body attaching tool 2 fixed to the ceiling R, the device main body 1 as shown in FIG.
Rotates about a bolt 3 in a vertical plane orthogonal to the axis of the bolt 3 and tilts with respect to the horizontal line, and when the angle of the tilt exceeds a tilt limit value, the switch 13 opens.

Therefore, in this case, the electric circuit connecting the electric motor 5 and the power source G is open, and the electric motor 5 is not connected to the electric power source. Therefore, even if the operator also operates the forward / reverse changeover switch 14, the electric motor is also opened. 5 does not drive and the lighting fixture 10 cannot be moved up and down. Thereby, the operator can clearly know that the apparatus main body 1 is attached to the main body attaching tool 2 with an inclination of an angle larger than the inclination limit value with respect to the horizontal line.

Therefore, the operator adjusts the position of the apparatus main body 1, loosens the tightening of the bolt 3 to which the apparatus main body 1 is attached, and rotates the apparatus main body 1 about the bolt 3 to move the position of the apparatus main body 1. Adjust so that the tilt angle with respect to the horizontal or horizontal line is within the range of the tilt limit value. As a result, the switch 13 is closed to close the electric circuit connecting the electric motor 5 and the power source G, and the electric motor 5 can be driven to move the lighting fixture 10 up and down. In addition, it is possible to prevent occurrence of a failure in the lifting operation of the lifting body 9 when the apparatus body 1 is tilted.

FIG. 6 shows an electric circuit connecting the electric motor 5 and the power source G in another embodiment. In the embodiment described above, in order to open the electric circuit that connects the electric motor 5 and the power source G in accordance with the inclination of the apparatus body 2, the switch that opens according to the inclination of the apparatus body 2 is used. In the example, instead of the switch, a sensor that detects the inclination of the apparatus body 1 and a switch that operates by the output of this sensor to open an electric circuit are used in combination.

That is, the sensor 21 is connected to the electric circuit in parallel with the terminal connected to the power source G. Also, a normally open contact 22 operated by the sensor 21.
, The relay 23 is connected in series and is connected in parallel to the terminal connected to the power supply G. Further, a normally closed relay contact 24 operated by the relay 23 is connected in series to the stator winding of the electric motor 5. The sensor 21 and the contact 22 are attached to the device body 1, and the relay 23 and its contact 24 are also attached to the device body 1. The sensor 21 outputs a voltage according to the inclination of the device body 1, and closes the contact 22 when the value of the output voltage exceeds a predetermined magnitude according to the inclination limit value of the device body 1. ing.

Reference numeral 25 denotes an indicator for receiving the output from the sensor 21 and displaying the inclination of the apparatus main body 21, which is provided on the wall of the building so that the operator can see it.

Then, when the position of the apparatus main body 1 attached to the main body attaching tool 2 is horizontal, or when the inclination angle with respect to the horizontal line is within the range of the inclination limit value,
Since the contact 22 remains open and the relay contact 24 is closed, the electric circuit connecting the electric motor 5 and the power supply G is closed. Thereby, the electric motor 5 can be driven to move the lighting fixture 10 up and down.

However, when the position of the apparatus main body 1 attached to the main body attachment 2 is inclined at an angle exceeding the inclination limit value, the value of the voltage output from the sensor 21 is the inclination of the apparatus main body 1. The contact 22 is closed beyond a predetermined size according to the limit value. Then, the relay 23 is energized and the contact 24 is opened. As a result, the electric circuit connecting the electric motor 5 and the power supply G is opened, and even if the operator operates the forward / reverse changeover switch 14, the electric motor 5 is not driven and the lighting fixture 10 cannot be moved up and down. This allows the operator to know that the apparatus body 1 is tilted with respect to the horizontal line at an angle of tilt exceeding the tilt limit value.

The present invention is not limited to the above-described embodiments, but can be implemented with various modifications. For example, the electric device connected to the elevating body in the electric lifting device of the present invention is not limited to the lighting equipment, and can be applied to a wide range of devices such as acoustic equipment. Further, the tightening member is not limited to the bolt.

[0037]

As described above, according to the electric lifting apparatus of the present invention, when the apparatus main body is attached to the ceiling or the like in a state in which the apparatus main body deviates from the predetermined range and is tilted, the lifting / lowering body cannot be moved up and down, Since it is possible to clearly know that the main body is tilted outside the predetermined range, it is possible to mount the apparatus main body on the ceiling or the like within the predetermined tilt range.

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic configuration of an electric lifting device according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a device body of the electric lifting device according to the embodiment.

FIG. 3 is a circuit diagram showing an electric circuit that drives an electric motor in the electric lifting device of the embodiment.

FIG. 4 is a view showing a mounting state of the apparatus body of the embodiment.

FIG. 5 is a view showing a mounting state of the apparatus body of the embodiment.

FIG. 6 is a circuit diagram showing an electric circuit for driving an electric motor according to another embodiment of the present invention.

[Explanation of symbols]

1 ... Device body, 2 ... Body mounting tool,
3 ... Bolt, 6 ... Wire rope, 9
... Lifting body, 13 ... Switch, 21 ... Sensor, 23 ... Relay.

Claims (1)

[Claims] 1. A device main body equipped with a drum for winding and unwinding a wire rope and an electric motor for driving the drum to rotate, and a device attached to a ceiling-side high place for holding the device main body by a tightening member along a horizontal axis. A main body fixture to be attached and attached, an elevating body which is supported by the wire rope and is suspended from the apparatus main body and is moved up and down by winding and unwinding the wire rope; and an electric device connected to the elevating body. A switch provided on the main body of the apparatus for opening an electric circuit connecting the electric motor and a power supply for supplying electric power to the electric motor when the main body of the apparatus is rotated about the tightening member and tilted. A characteristic electric lifting device.