JP2002104786A - Ascending/descending device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ascending/descending device capable of accurately stopping load at a specified descending position. SOLUTION: This ascending/descending device is provided with a hanging member; an ascending/descending portion to which the load can be connected; a fixed portion fixed to a ceiling of a structure and coupled with the ascending/ descending portion through the hanging member; and a driving means including a winding drum to which one end of the hanging member is connected and a motor for rotating the winding drum, and enabling the ascending/descending portion to ascend/descend by using the hanging member; a rotating element providing a not more than one turn while the ascending/descending portion is descended from the highest position and hanging member is completely released from the winding drum; and a stop switch stopping a descent of the ascending/descending portion by stopping power supply to the motor on the basis of the turning amount of the rotating element.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lifting device for a load such as a lighting fixture mounted at a high place, and more particularly to a lifting device capable of accurately stopping a load at a predetermined lowered position.

[0002]

2. Description of the Related Art Conventionally, in a large structure having a relatively high ceiling such as a concert hall, a gymnasium, a convention hall, etc., a lighting fixture elevating device is used to facilitate maintenance of the lighting fixture mounted on the ceiling. I have. The lifting device is mainly a lifting unit to which the lighting equipment is connected,
It comprises a suspending member for suspending the elevating unit, a driving unit for raising / lowering the elevating unit via the suspending member, and a fixing unit for fixing the driving unit to the ceiling.

As a driving means, a winding drum to which one end of a hanging material is connected and an electric motor for rotating the winding drum for winding the hanging material are generally used. With the lifting device having such a configuration, the lifting unit is moved between the uppermost position near the ceiling where the lighting fixture is used and the lowermost position lowered near the floor surface for maintenance of the lighting fixture. It becomes possible.

[0004]

In this type of elevating device, for example, a power supply time to a motor for rotating the winding drum is set by a timer or the like to control the lowering position of the elevating unit. However, there is a problem in that the lowering position of the elevating unit varies due to a variation in the rotation speed of the motor or the like. In particular, in a large structure as described above, since a large number of elevating devices are mounted on the ceiling, if there is variation in the descent position of the elevating unit in each of the elevating devices, it becomes difficult to perform maintenance.
As a result, there has been a problem that the maintenance work efficiency is reduced.

[0005]

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above-mentioned problems, and an object of the present invention is to lower a lifting part to which a load is connected accurately to a predetermined lowering position. It is an object of the present invention to provide an elevating device which can be used.

That is, a lifting device according to a first aspect of the present invention includes at least one lifting member, a lifting portion to which a load can be connected, and a ceiling fixed to a structure, and is connected to the lifting portion via the lifting member. Fixed part, a winding drum to which one end of the hanging material is connected, and an electric motor for rotating the winding drum to wind the hanging material, the lifting part can be raised and lowered by using the hanging material And a rotating body that provides rotation within one rotation while lowering the lifting unit from the uppermost position where the distance from the fixed unit to the lifting unit is minimized and completely releasing the hanging material from the winding drum. And a stop switch for stopping the power supply to the electric motor based on the rotation amount of the rotating body and stopping the lowering of the elevating unit.

According to a second aspect of the present invention, in the first aspect of the present invention, a setting means for setting the rotation amount of the rotating body to a predetermined amount is provided, and the stop switch is activated by the predetermined amount of rotation of the rotating body. Features.

According to a third aspect of the present invention, in the first aspect of the present invention, the position of the stop switch can be changed so that the stop switch is activated when the rotating body rotates a predetermined amount.

According to a fourth aspect of the present invention, in the first or second aspect of the present invention, the rotating body is a last-stage gear arranged so as to be connectable to the winding drum via a reduction gear. It has a knob used to disengage the final stage gear and the reduction gear and set the rotation amount of the final stage gear to a predetermined amount.

A fifth aspect of the present invention is characterized in that, in the fourth aspect of the invention, the knob is exposed on the surface of the fixing portion so as to be operable from the outside.

According to a sixth aspect of the present invention, in the fourth or fifth aspect, the last gear is spring-biased in the axial direction, and when the rotation amount of the last gear is set to a predetermined amount, the last gear is set. Is moved in the axial direction against the bias of the spring to disengage the final stage gear and the reduction gear.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a lifting apparatus according to the present invention will be described below in detail with reference to the accompanying drawings. Although the load is not particularly limited, it is used by being placed at a high place (near a ceiling) and needs to be lowered to near the ground (floor surface) in order to perform its maintenance.
For example, lighting equipment, security cameras, fire detectors, banners, and the like can be given.

FIG. 1 shows an external view of a lighting apparatus elevating device according to this embodiment. The lifting device includes, as main components, a hanging member 2 formed of a pair of strips, a lifting unit 3 to which a lighting fixture can be connected at a lower portion, and a ceiling fixed to a structure. And a fixed portion 1 to be connected.

The hanging member 2 is preferably made of a rigid metal material or the like. There is no particular limitation on the number of hanging members, but when two or more are used, even if one of them is broken, the remaining lifting part 3 can be retained, which is preferable in terms of safety.

The fixed portion 1 is provided with a concave portion 1 in which the elevating portion 3 can be accommodated.
3 is provided on the lower surface of the case 10 and
There is provided a drive unit that enables the lifting unit to be moved up and down using the. The case 10 includes a base 12 fixed to the ceiling of the structure, and a cover 14 detachably attached to the base.

As shown in FIG. 2, the driving unit includes a pair of winding drums 20 to which one ends of the hanging members are connected for winding each of the hanging members 2, and a permanent magnet for rotating the winding drum. It includes a DC motor 22 having a commutation brush, and a reduction gear 26 that reduces the rotation of the drive shaft of the motor and transmits the rotation to the winding drum. Note that an AC motor may be used instead of the DC motor. In FIG. 2, a predetermined electric circuit and the like are arranged in an area indicated by reference numeral 7.

As shown in FIG. 3, the suspension member 2 having one end connected to the winding drum 20 extends vertically downward through the pulley 5 toward the elevating portion 3. At this time, the pair of hanging members 2
The strips extend so that they are substantially parallel and the planes of the strips are substantially in the same direction. The rotation of the drive shaft of the DC motor 22 is transmitted via a reduction gear 26 to a spur gear 24 provided at one end of a main shaft 21 that is a rotation shaft of the pair of winding drums 20. Thereby, the pair of winding drums 20
Can be rotated simultaneously and in the same direction.

By driving the DC motor 22 in the above-described configuration, the lifting unit 3 is
0 and the winding drum 20
The lifting part 2 and the lifting part 3
The elevating unit can be moved up and down between the lowermost position where the distance between them is the largest.

The lifting device according to the present invention sets the working length of the lifting member 2 so that the lowering position of the lifting portion is at an appropriate position according to the height of the structure from the floor to the ceiling. The fixing unit has an adjustment unit. As shown in FIG. 4, the hanging material length adjusting unit lowers the elevating unit 3 by driving the DC motor 22 to provide rotation within one rotation while completely lifting the hanging material 2 from the winding drum 20. Final stage gear 50
And a reduction gear unit 55 for reducing the rotation of the winding drum and transmitting it to the final gear, and stopping the power supply to the motor to stop the lowering of the elevating unit when the rotation amount of the final gear reaches a predetermined amount. And a stop switch 58 for performing the operation.

The reduction gear unit 55 includes a plurality of gears (55a to 55c). These gears are
2 and is held by a bearing unit integrally formed. For example, as shown in FIG. 5, the bearing portion has a plurality of projections (15 a to 15 c) having different projection heights and having a bearing recess 16 for holding a support shaft of a gear at each end. Gear 55 arranged in the bearing recess 16 of the highest projection 15b
By holding only the support shaft b by using the holding member 17, the remaining gears (55
a, 55c) can be held on the bearing member without the holding member. Thereby, the number of parts of the bearing portion can be reduced, the cost can be reduced, and the reduction gear unit 55 can be made smooth with less noise.

The holding member is integrally provided on the inner surface of the cover 14, and the cover of the gear is held between the corresponding bearing recess 16 and the holding member 17 by attaching the cover to the base 12. Is also preferable.

The reduction gear unit 55 is disposed so as to mesh with each of the spur gear 25 and the last gear 50 provided at the other end of the main shaft 21. As shown in FIG. 4, the final gear is provided with a knob 51 which is used to disengage the final gear and the reduction gear unit 55 and set the rotation amount of the final gear 50 to a predetermined amount. Have been. The final gear 50 includes a projection 52 that can contact the lever 59 of the stop switch 58 and a scale 53 for setting the rotation amount of the final gear.

As shown in FIG. 1, the knob 51 is exposed on the surface of the cover 14 so that it can be operated from the outside.
The rotation scale 53 can be seen through the window hole 18.
As shown in FIG. 2, the final gear 50 is urged in the axial direction by a spring 54, and the amount of rotation of the final gear is determined by adjusting the final gear 50 to the spring force of the spring 54. This operation is performed by moving the final stage gear and the gear of the reduction gear unit in reverse to move the shaft in the axial direction.

The use length of the hanging member can be determined as follows by using the hanging member length adjusting unit having the above configuration. That is, the rotation amount of the final gear 50 is set to a predetermined amount with reference to the display of the scale 53. Case 10
When the DC motor 22 is driven to lower the elevating unit 3 accommodated in the concave portion 13 of the motor, the rotation of the winding drum 20 is transmitted through the reduction gear unit 55 and the end gear 5
0 starts to rotate slowly. As shown in FIG. 4, when the rotation amount of the final gear 50 reaches a predetermined amount, the projection 52 pushes down the lever 59 of the stop switch 58, the power supply to the motor is stopped, and the elevating unit 3 moves down the predetermined lowering position. Stop at the position.

In the above example, the rotation amount of the final gear 50 is set to a predetermined amount, and the stop switch 58 fixed to the base 12 operates when the rotation amount of the final gear reaches the predetermined amount. However, a configuration may be adopted in which the position of the stop switch can be changed so that the stop switch is activated when the final gear rotates by a predetermined rotation amount.

[0026]

According to the elevating device of the present invention, the rotating body that provides the rotation within one rotation while the lifting member is lowered from the uppermost position to completely release the hanging material from the winding drum, By providing a stop switch that stops the power supply to the motor based on the amount of rotation and stops the lowering of the elevating unit, the elevating unit can be lowered with a good reproducibility without lowering the descent position of the elevating unit. There is an effect that it can be lowered to the position. Therefore, the elevating device of the present invention is particularly suitable for use in large structures having relatively high ceilings such as concert halls, gymnasiums, and convention halls, and the efficiency of maintenance work for loads such as lighting fixtures arranged at high places. Its value is high in that it can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an external appearance of a lifting / lowering device for a lighting fixture according to an embodiment of the present invention.

FIG. 2 is a schematic top view showing an internal configuration of a fixing portion of the lifting device.

FIG. 3 is a schematic cross-sectional view showing an internal configuration of a fixing unit of the above.

FIG. 4 is a schematic view showing a hanging member length adjusting unit of the elevating device.

FIG. 5 is an exploded perspective view showing a bearing of the hanging member length adjusting unit according to the first embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed part 2 Suspension material 3 Elevating part 5 Pulley 10 Case 12 Base 14 Cover 20 Winding drum 22 DC motor 50 Final gear 58 Stop switch

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yasuhiro Miyazaki 1048 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Works Co., Ltd. (72) Inventor Shiro Nakajima 5-66 66 Shioe, Amagasaki City, Hyogo Prefecture Inside

Claims (6)

[Claims] At least one hanging member, a lifting part capable of connecting a load, a fixed part fixed to a ceiling of a structure, and connected to the lifting part via the hanging member, A drive unit that includes a winding drum having one end connected thereto, and an electric motor for rotating the winding drum to wind the hanging member, and a driving unit that enables the lifting unit to move up and down by using the hanging member; and the fixing unit. A rotating body that provides rotation within one rotation while lowering the lifting / lowering unit from the uppermost position where the distance from the lifting unit to the lifting unit is minimum and completely unraveling the hanging material from the winding drum; And a stop switch for stopping power supply to the electric motor to stop the lowering of the lifting / lowering unit based on the above. 2. The apparatus according to claim 1, further comprising setting means for setting a rotation amount of the rotating body to a predetermined amount, wherein the stop switch is activated by the rotation of the rotating body by a predetermined amount. lift device. 3. The lifting device according to claim 1, wherein the position of the stop switch is changeable so that the stop switch is activated when the rotating body rotates a predetermined amount. 4. The rotator is a final gear that can be connected to the winding drum via a reduction gear, and the final gear is meshed with the final gear and the reduction gear. The lifting device according to claim 1 or 2, further comprising a knob used to set the rotation amount of the final gear to a predetermined amount by removing the rotation. 5. The lifting device according to claim 4, wherein the knob is exposed on a surface of the fixing portion so that the knob can be operated from the outside. 6. The final gear is spring-biased in the axial direction, and when the rotation amount of the final gear is set to a predetermined amount,
Moving the final gear in the axial direction against the bias of the spring,
The lifting device according to claim 4 or 5, wherein the final stage gear and the reduction gear are disengaged from each other.