JPH0528815A - Motor-driven elevating and sinking device - Google Patents

Abstract

PURPOSE:To prevent an electric contact for current receiving from burning-out by allowing the contact to move up and down smoothly even when apparatus side leads are pulled. CONSTITUTION:An elevating/sinking device body 22 installed at a high altitude on the ceiling side is furnished with a takeup drum 26, and an elevating/sinking body 24 hung by a wire rope 23, which is wound on and paid off from this takeup drum 26, is equipped with an electric contact mounting table 52 insulated electrically. A plurality of current receiving contacts 73 to be contacted with and separated from respective current feeding contacts 31, which are provided on the device body 22 and connected electrically with a power supply, are supported by this table 52 with possibility of moving up and down individually. The table 52 is fitted with relaying electroconductive metal pieces 65 in the same number as the current receiving contacts 73, and they are connected together through respective relay leads 70. To these relaying metal pieces 65, apparatus side leads 68 are connected which are led from the electrical apparatus A coupled with the elevating/sinking body 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric hoisting device for hoisting a lighting fixture, a speaker, or other electric equipment that can be hoisted up on a high ceiling such as a ceiling of a factory or a gymnasium.
In particular, the present invention relates to an electric lifting device having an improved structure for making an electrical connection between the electric device and a lifting body that is connected to the lifting device and moves up and down.

[0002]

2. Description of the Related Art FIG. 11 is a schematic view of an electric lifting device.
Reference numeral 1 is a lifting device body installed on a high ceiling such as a factory or a gym. The main body 1 is equipped with a motor 2 and a winding drum 4 that winds and unwinds the wire rope 3 that is normally and reversely rotated by the motor 2. The wire rope 3 is routed through a plurality of wire guides 9 and also suspends an elevating body 6 to which the lighting fixture 5 is connected and supported. By winding and unwinding the rope 3 around the winding drum 4, the lighting fixture 5 is moved up and down, whereby the fixture 5 can be easily maintained and inspected.

As shown in FIG. 12, the elevating body 6 is formed by screwing a bottom lid 6b to the lower surface opening of a metal body 6a having a circular cup shape having an opening on the lower surface. A pair of rollers 11 for guiding the wire rope 3 are housed in the elevating body 6, and a device-side lead wire 12 for inserting the bottom cover 6b is housed therein. Device side lead wire 1
Reference numeral 2 is led from a lighting fixture 5, and its tip is connected to the power receiving contact 7 as described later. The device-side lead wires 12 are used in large numbers as the number of lamps included in the lighting fixture 5 increases. 12a in FIG. 12 is a cord bush.

A plurality of power receiving contacts 7 which are vertically urged by a spring 10 are provided on the upper wall of the lifting body 6 so as to be movable up and down. That is, as shown in FIG. 13, the power receiving contact 7 penetrates through the upper wall 6c of the main body portion 6a and vertically penetrates the bush-shaped electrical insulator 14 stopped by the snap ring 13.
The contact 7 is always urged upward by a spring 10 and is fitted by a flat washer 16 fitted to a screw portion 7a formed at the lower end of the power receiving contact 7 and fixed by a nut 15.
It has been prevented from slipping upward. A crimp terminal 17 attached to the tip of the device-side lead wire 12 is fitted to the threaded portion 7 a, and a spring washer 18 for sandwiching the terminal 17 with the nut 15 is also fitted to the screw portion 7 a. Further, a nut 19 is screwed into the screw portion 7a, and the crimping terminal 17 is fixed to the power receiving contact 7 by tightening the nut 19 so that the contact 7 and the lighting fixture 5 are electrically connected. In addition, reference numeral 20 in FIG. 12 denotes a separator made of a thin synthetic resin plate, which is inserted between the device side lead wires 12.

The power receiving contact 7 is provided in the main body 1 when the lifting body 6 is placed in a raised position, in other words, when the lifting body 6 is supported by the lifting device main body 1, a plurality of power feeding contacts 8 (which are connected to a power source). (See FIG. 11), they are separately pressed. At that time, the power receiving contact 7 is pushed down against the spring 10.
Further, when the lifting / lowering body 6 is lowered, the power receiving contact 7 is separated from the power feeding contact 8 and simultaneously pushed up by the force of the spring 10.

[0006]

In the conventional structure in which the tip of the equipment-side lead wire 12 is directly connected to the power-receiving contact 7 as described above, the equipment-side lead wire is moved along with the vertical movement of the power-receiving contact 7 each time it is moved up and down. 12 is moved within the lift 6. By the way, the device-side lead wire 12 inevitably has a workable margin length when connecting it to the power receiving contact 7, and the margin length is accommodated in the lifting body 6. However, the lifting body 6
Since the device itself is not so large, the plurality of device-side lead wires 12 housed therein are overcrowded. This overcrowded state becomes more remarkable as the number of lamps used in the lighting fixture 5 increases.

Therefore, although the device-side lead wires 12 are separated from each other by the separator 20, the device-side lead wires 12 are substantially interfered with each other by the movement of the separator 20, and the power receiving contact is made. The vertical movement of 7 may be hindered. Further, when the electric equipment such as the lighting equipment 5 is attached to the lifting body 6, the equipment-side lead wire 12 may be pulled during the work. Then, the pulling force is applied to the power receiving contact 7
In addition, the vertical movement of the power receiving contact 7 may be hindered.

If the power receiving contact 7 malfunctions due to the above-mentioned reasons, when the lifting body 6 is lifted, the power receiving contact 7 will fail to contact the power feeding contact 8. Then, the contact resistance between the contacts 7 and 8 during conduction is significantly increased, and there is a problem that the contact portion is burned by the heat generated thereby.

It is an object of the present invention to provide an electric lifting device which ensures smooth vertical movement of a power receiving contact even when a device-side lead wire is pulled and prevents the contact portion from being burnt out. ..

[0010]

In order to achieve the above object, the electric lifting device of the present invention is wound and rewound on a winding drum provided in a lifting device body arranged at a high place on the ceiling side. An elevating body suspended via a wire rope is provided with an electrically insulating contact mount, and a plurality of power receiving contacts that are respectively connected to and separated from a plurality of power supplying contacts provided on the main body and electrically connected to a power source. , Each of which is vertically movably supported on the contact mounting base, and has the same number of relay conductive metal fittings as the power receiving contacts in the mounting base, and these metal fittings and the power receiving contacts are separately connected by relay lead wires. At the same time, a device-side lead wire led from an electric device connected to the lifting body is connected to the relay conductive fitting.

[0011]

According to the above construction, the power receiving contact and the equipment-side lead wire are electrically connected to each other via the relay lead wire and the relay conductive metal fitting without directly connecting them. By shortening at least the amount corresponding to the relay lead wire and the relay conductive metal fitting, the length of the lead wire accommodated in the lifting body can be shortened. In addition, when the electrical equipment is attached to the lifting body, the pulling force applied when the equipment-side lead wire is pulled during the work is stopped by acting on the relay conductive metal fittings, and is applied to the relay lead wire and the power receiving contact. It does not extend.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS. Electric lifting device 21 shown in FIGS.
Is provided with a lifting device main body 22 and a lifting body 24 that is suspended below the main body 22 via a wire rope 23 and is lifted and lowered during maintenance and inspection. Lifting device body 22
Is located at a high place on the ceiling side of a gymnasium. A lighting fixture A is connected to and supported by the lift 24 as shown in FIG.

A motor 25 and a winding drum 26, which is rotated forward and backward by the motor 25, are fixed to the lifting / lowering device body 22. The motor 25 has a non-excitation actuated electromagnetic brake and a deceleration portion. A winding drum 26 is connected to the output end of the deceleration portion. As shown in FIG. 9, the drum 26 has a first winding portion 26a and a second winding portion 26b partitioned by a separator 27.

An elevating body holder 28 for supporting the elevating body 24 from being accidentally dropped is fixed to the elevating device body 22. The holder 28 has a rotatable locking claw 29 that engages with and disengages from a pair of locking step portions 24 a formed on the outer periphery of the elevating body 24, and a coil spring 30 that urges the claw 29.

As shown in FIG. 10, the locking claw 29 is engaged with the locking step portion 24a from an obliquely lower side so that the lifting body 2 is moved.
4 is supported, and the coil spring 30 is bent in this state. Therefore, when the elevating body 24 is moved further upward so that the tip of the locking claw 29 faces the lower peripheral surface 24b of the elevating body 24, at that time, the peripheral surface 24b and the locking stepped portion 24a are separated. Due to the difference in the position in the radial direction, the locking claw 29 is rotated downward by the force of the coil spring 30 so as not to interfere with the downward movement of the elevating body 24.

Reference numeral 50 in FIGS. 8 and 10 designates a contact mounting plate made of synthetic resin disposed inside the lifting body holder 28, to which a plurality of feeding contacts 31 are mounted.
These contacts 31 are connected to a power supply. Contact mounting plate 5
0 and a ceiling wall 22a of the lifting / lowering device main body 22 are provided with a plurality of coil springs (not shown). The spring force pushes the lifting / lowering body 24 supported by the locking claws 29 downward, The elevating body 24 is prevented from moving carelessly.

In FIGS. 9 and 10, reference numeral 32 is a printed wiring board on which a switch and other electric parts 33 are mounted, and 34.
Is a circuit board to which the relay 35 is attached, and 36 is a detection device that detects tension and looseness of the wire rope 23, and is fixed to a pair of seesaw levers 38 urged by a spring 37 and a base 39 pivotally supporting the levers 38. The micro switch 40 is turned on and off by the seesaw lever 38.
And are formed.

The lifting device main body 22 has first and second rotatable guide pulleys located around the lifting body holder 28.
The fifth wire guides 41 to 45 are attached. The first and second wire guides 41 and 42 are the lift holder 28.
It is arranged on the opposite side of the motor 25 with
The third wire guide 43 is arranged close to the side surface of the lifting body holder 28 on the printed wiring board 32 side. The fourth wire guide 44 is arranged close to the side surface of the lift holder 28 on the side of the detection device 36, and the fifth wire guide 45 is arranged between the detection device 36 and the first wire guide 41. ing.

First, second and fifth wire guides 4
1, 42 and 45 are horizontal ceiling walls 22 of the lifting device body 22.
The third and fourth wire guides 43 and 44 are mounted vertically along the outer surface of the vertical side wall of the lifting body holder 28 while being mounted in such a posture as to follow a.

The wire rope 23 is wound with its one end fixed to the first winding portion 26a of the winding drum 26, and the other end of the second winding portion 2 of the winding drum 26.
It is fixedly wound on 6b and wound around, and is routed by hanging the intermediate portion on the first to fifth wire guides 41 to 45.

That is, as shown in FIG. 9, the end portion of the wire rope 23 extends from the first winding portion 26a to the detecting device 3a.
The first to third wire guides 41 to 43 are sequentially passed through one of the seesaw levers 38 of 6, and the other end side portion of the wire rope 23 extends from the second winding section 26b to the other side of the detection device 36. 5th and 4th through the seesaw lever 38 of
The wire guides 45 and 44 are successively wound around. Further, an intermediate portion of the wire rope 23 located between the third and fourth wire guides 43, 44 is stretched over a pair of rotatable guide pulleys 46 (see FIG. 9) built in the lifting body 24.

Therefore, both winding parts 2 of the winding drum 26 are
The wire rope 23 is simultaneously wound around 6a and 26b, so that the elevating body 24 is raised, and conversely, both winding portions 2
When the wire rope 23 is simultaneously unwound on the 6a and 26b, the elevating body 24 is lowered. In addition, the lifting body 2
In the final stage of the ascending of 4, the locking claw 29 is automatically engaged with the locking step portion 24a, and the lifting body 24 is lifted by the lifting device body 22.
Mechanically supported by. When the descent is started, the descent operation is first performed after the elevating body 24 is slightly raised until the locking claw 29 faces the lower peripheral surface 24b of the elevating body 24.

As shown in FIGS. 6 and 8, the lifting / lowering body 24 is made of a short cylindrical metal lifting / lowering body 51 having upper and lower ends opened, and a heat-resistant composite having the upper end opening closed. A resin contact mount 52 and a synthetic resin bottom cover 53 attached by closing the lower end opening of the lifting body 51.
It is formed by and. In addition, 54, 5 in FIG. 2 and FIG.
Denoted at 5 are mounting screws which can be respectively attached and detached.

As shown in FIG. 2, a pair of pulley installation grooves 56 are formed on the upper surface of the lift body 51, and the guide pulley 46 is provided in these grooves via a pivot shaft 57 (see FIG. 10). Is rotatably attached. The wire rope 23 hung on these pulleys 46 is passed through a notch groove 56 provided in the peripheral portion of the contact mount 52.

As shown in detail in FIGS. 1 to 6, the contact mount 52 has a disk-shaped lid 57 for closing the upper opening of the lifting body 51, and a frame on the lower surface of the lid 57, which is integrally formed. It is formed of a pair of protruding contact mounting frames 58.
As shown in FIG. 4, the contact point mounting frame 58 has, for example, two partition walls 59, and the inside thereof has first to third small chambers 60 to 6 inside.
It is divided into two. Each of the small chambers 60 to 62 is provided with a metal fitting mounting portion 63 and a contact mounting portion 64 as shown in FIG. The metal fitting mounting portion 63 provided at the lower position has a step shape, and the contact mounting portion 64 at a position higher than this is formed by the thick portion of the lid portion 57.

A relay conductive metal fitting 65, which is bent in a stepwise manner along the metal fitting mounting portion 63, is mounted via first and second screws 66 and 67. The first screw 66 passing through the piece 65a of the relay conductive metal fitting 65 is fastened together with the crimp terminal 69 fixed to the tip of the device-side lead wire 68 led from the lighting fixture A, and the terminal 69 and the relay conductive The metal fitting 65 is electrically connected. Similarly, the second screw 67 passing through the other piece 65b of the relay conductive metal fitting 65 is tightened together with the crimp terminal 71 fixed to one end of the relay lead wire 70 to electrically connect the terminal 71 and the relay conductive metal fitting 65. Connected.

A guide hole 72 (see FIGS. 4 and 5) is vertically penetrated through the contact mounting portion 64. This hole 7
A power receiving contact 73 that comes into contact with and separates from the power feeding contact 31 is penetratingly supported by 2 so as to be vertically slidable. This contact 73
Is always biased upward by a coiled spring 74, and a screw portion 73 formed at the lower end of the power receiving contact 73 is
A flat washer 76 fitted to a and fixed with a nut 75 prevents the upward disengagement. Another crimp terminal 77 fixed to the other end of the relay lead wire 70 and a spring washer 78 are fitted to the screw portion 73a. The crimp terminal 77 and the spring washer 78 are sandwiched between the flat washer 76 and the nut 75. Therefore, the power receiving contact 73 is electrically connected to the device-side lead wire 68 via the relay lead wire 68 and the relay conductive fitting 65.

The relay conductive fitting 65 and the power receiving contact 73 as described above are mounted in at least one small chamber of the both-contact mounting frame 58. 1 to 3 show an example in which each of the small rooms 60 to 62 is implemented so that the wiring is suitable for the lighting fixture A for three lights.

As shown in FIG. 9, the bottom lid 53 is provided with a plurality of through holes 79 facing the portion of the metal fitting mounting portion 64 into which the first screw 66 is screwed. These through holes 79
An instrument side lead wire 68 is passed through.

The lifting body 24 of the electric lifting device having the above-mentioned structure is
For maintenance and inspection of the lighting equipment A connected to it,
As described above, both winding portions 26a and 26b of the winding drum 26 are provided.
The wire rope 23 is lifted up by simultaneously winding the wire rope 23 around it, and conversely, the wire rope 23 is wound around the winding portions 26a and 26b.
It is lowered by rewinding at the same time.

When the lifting / lowering body 24 is raised and engaged and held by the lifting / lowering device main body 21, the power receiving contact 73 contacts the power feeding contact 31, and the power receiving contact 73 moves downward against the spring 74. While being pressed against the power supply contact 31. Thereby, the lighting fixture A and the power supply are electrically connected. In addition,
The pressure contact is strengthened by not only the biasing force of the spring 74 but also the biasing force of a coil spring (not shown) that biases the contact mounting plate 50 downward. Further, when the lifting body 24 descends, the power receiving contact 73 separates from the power supplying contact 31, the lighting fixture A is disconnected from the power source, and the power receiving contact 73
Is pushed up by the spring 74. The up-and-down movement of the power receiving contact 73 associated with the ascending / descending is smoothly performed for the following reason, so that the contact portion can be used without fear of being burned after maintenance and inspection.

That is, the power receiving contact 73 and the appliance side lead wire 68 are electrically connected to each other via the relay lead wire 70 and the relay conductive metal fitting 65 without being directly connected. Therefore, the length of the instrument side lead wire 68 can be shortened by at least the amount corresponding to the relay lead wire 70 and the relay conductive metal fitting 65, and accordingly, the instrument side lead wire 68.
It is possible to shorten the length in which the is housed in the lifting body 24. Therefore, the appliance-side lead wire 68 is not housed in the lifting body 24 in an overcrowded state, and the interference between the lead wire 68 and the power receiving contact 73 and the relay lead wire 70 can be prevented. The relay lead wire 70 alone moves up and down, and the appliance-side lead wire 68 does not hinder the operation.

Moreover, in this embodiment, each of the small rooms 60 to 62 is
Is partitioned by the partition wall 59 formed integrally with the contact mounting frame 58, the movement of one relay lead wire 70 does not affect the other relay lead wires 70.

When the lighting fixture A is attached to the lift 24, when the person involved in the construction pulls the lead wire 68 on the fixture side, the pulling force is the first
The relay lead wire 70 and the power receiving contact 73 are prevented from reaching the fixing portion by the screw 66.

Therefore, since the power receiving contact 73 can be smoothly moved up and down without causing the malfunction thereof, when the lifting body 24 is raised, the contact failure of the power receiving contact 73 with the power feeding contact 31 occurs. There is no fear. Therefore, there is no increase in contact resistance between the contacts 31 and 73 during conduction, and it is possible to prevent the contact portion from being burned.

It should be noted that the present invention is not limited to the above-described embodiment, but the lifting / lowering body of the lifting / lowering body has a circular cup shape with an opening on the lower surface as in the conventional case, and a bush-shaped electric insulator on the upper wall thereof. It is also applicable to the one using an elevating body in which a power receiving contact is attached so as to move up and down.

[0037]

As described above in detail, in the electric lifting apparatus of the present invention, the equipment side lead wire is not housed in the lifting body in an overcrowded state, and the lead wire, the power receiving contact, and the relay lead wire are provided. It can prevent interference with
When the electric equipment side lead wire is pulled when the electric equipment is attached to the lifting body, the pulling force does not affect the relay lead wire and the electric power receiving contact, so that the smooth vertical movement of the electric receiving contact can be guaranteed. The contact failure between the power feeding contact and the power receiving contact is eliminated, and the contact portion can be prevented from burning due to an increase in contact resistance between the two contacts when conducting.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a main part of an electric lifting device according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing the lift body and the contact mount of the lift body included in the electric lift device according to the same embodiment separately.

FIG. 3 is a rear view showing the contact mount of the elevating body according to the same embodiment with wiring.

FIG. 4 is a rear view showing the contact mount according to the same embodiment.

FIG. 5 is a view showing the contact mount according to the same embodiment as Z in FIG.
-A sectional view taken along the line Z.

FIG. 6 is a front view showing the entire lifting body according to the same embodiment in an exploded manner.

FIG. 7 is a perspective view showing a state in which an electric lifting device according to the same embodiment supports a lighting fixture.

FIG. 8 shows an electric lifting device according to the same embodiment as YY in FIG.
Sectional drawing shown along a line.

FIG. 9 is a diagram showing an electric lifting device according to the same embodiment, with its covers removed, looking up from the direction of arrow X in FIG.

FIG. 10 is a side view showing an electric lifting device according to the same embodiment with its covers removed.

FIG. 11 is a diagram schematically showing a configuration of an electric lifting device.

FIG. 12 is an exploded perspective view of a lifting body portion of a conventional electric lifting device.

FIG. 13 is a cross-sectional view showing a mounting portion of the conventional power receiving contact.

[Explanation of symbols]

21 ... Electric lifting device, 22 ... Lifting device main body, 23 ... Wire rope, 24 ... Lifting body, 25 ... Motor, 26 ... Winding drum, 31 ... Feed contact, 52 ... Contact mount, 65 ... Relay conductive metal fitting , 68 ... Device side lead wire, 70 ... Relay lead wire, 73 ... Power receiving contact, A ... Lighting fixture (electrical device).

Claims (1)

Claim: What is claimed is: 1. An elevating device main body provided with a motor for driving a winding drum for winding and unwinding a wire rope, which is arranged at a high place on a ceiling side, and a main body provided in the main body. A plurality of power supply contacts electrically connected to a power source, and an elevating body that is suspended by the wire rope and that is elevated by connecting an electric device,
In an electric lifting device including a plurality of power receiving contacts which are provided on the lifting body and are respectively brought into contact with and separated from the power feeding contacts and electrically connected to the electric equipment, the lifting body is provided with the plurality of power receiving contacts. An electrically insulating contact mounting base that supports up and down movement is provided, and the same number of relay conductive metal fittings as the power receiving contacts are mounted in this mounting base, and these metal fittings and the power receiving contact are separately connected by relay lead wires. At the same time, a device-side lead wire led from the electric device is connected to the relay conductive metal fitting.