JPH0528816A - Motor-driven elevating and sinking device - Google Patents

Abstract

PURPOSE:To provide a motor-driven elevating/sinking device, which ensures contacting of current feeding contacts and receiving contacts so as to permit them to be structured small and with which the electric contacts are prevented from burning out. CONSTITUTION:A motor-driven elevating/sinking device concerned comprises a bottom wall 61 equipped with a current feeding contact 31, in which a contact table 60 provided on the body 22 of the elevating/sinking device is energized downward by a table pushing spring 76, a pair of side walls 62, and a pair of stopper projections 63 provided on the side walls where a groove 64 is formed for admitting fit of a part of an elevating/sinking body 24 hung at the device body through a wire rope. A pair of fit projections 78 to be fitted between the mating surfaces of the two side walls are furnished on the peripheral surface of this elevating/sinking body, and a tapered surface is provided at least either of the ends in longitudinal direction of these fit projections and the bottoms of stopper projections. A contact spring having a smaller resilience than the pushing spring 76 is installed to energize one of the abovementioned current feeding contacts and current receiving contacts 82 furnished on the elevating/sinking body toward the other, and also a switch 77 is furnished to sense the contact table on the device body and stop the rising operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric lifting device for moving up and down a lighting device, a speaker, and other electric devices that are installed on a high ceiling such as a ceiling of a factory or a gym.

[0002]

2. Description of the Related Art FIG. 14 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 5 and also suspends an elevating body 7 to which a lighting fixture 6 is connected and supported. By winding and unwinding the rope 3 around the winding drum 4, the lighting fixture 6 is moved up and down at a slow speed, so that maintenance and inspection of the fixture 6 and the like can be easily performed. A limit switch 8 is attached to the lifting / lowering apparatus main body 1, and when the switch 8 is pushed by the lifting / lowering body 7, the winding operation of the winding drum 4 by the motor 2 is stopped.

A contact block 1 made of metal provided on the main body 1 of the lifting device.
A plurality of power feeding contacts 15 are attached to 6. That is, the feeding contact 15 penetrates the bush-shaped electric insulator 18 attached via the retaining ring 17a as shown in FIG. The crimp terminal 17 is attached to the screw portion 15 a of the contact 15.
b and the spring washer 17c are fitted together, and the nut 19 is screwed. The power supply side lead wire is connected to the crimp terminal 17b which is pressed against the power supply contact 15 by tightening the nut 19.

The elevator 7 is provided with a plurality of power receiving contacts 9 which are urged upward and can move up and down. That is, as shown in detail in FIG. 15, the power receiving contact 9 penetrates through the metal top wall 7a of the lifting body 7 and vertically penetrates the bush-shaped electrical insulator 11 that is stopped by the retaining ring 10a. The contact 9 is constantly urged upward by a contact spring 12 and has a screw portion 9a formed at the lower end of the power receiving contact 9.
Flat washer 10b fitted to the base and fixed with nut 13a
It is prevented from slipping upward. A crimp terminal 14a attached to the tip of the device-side lead wire 14 of the lighting fixture 6 is fitted to the screw portion 9a, and the spring washer 1 that sandwiches the terminal 14a with the nut 13a.
0c is fitted. Further, a nut 13b is screwed into the screw portion 9a, and the crimp terminal 14a is pressed against the power receiving contact 9 by tightening the nut 13b, and the contact 9 and the lighting fixture 6 are electrically connected.

The power receiving contacts 9 are provided in the main body 1 when the lifting body 7 is placed in the raised position, in other words, when the lifting body 7 is supported by the lifting device main body 1, the plurality of power feeding contacts 15 connected to the power source. Are contacted separately. At that time, the power receiving contact 9 is pushed down against the contact spring 12, so that the contacts 9 and 15 are pressed against each other. Further, when the lifting / lowering body 7 is lowered, the power receiving contact 9 is separated from the power feeding contact 15 and simultaneously pushed up by the force of the contact spring 12.

[0006]

As described above, in the electric lifting device for lifting the lifting body 7 via the wire rope 3, when the lifting body 7 is set in the lifting device body 1, the lighting fixture 6 is raised. And the lifting / lowering body 7 may shake or rotate. When the lifting body 7 is set on the lifting body 1 by such a movement, the position of the power receiving contact 9 with respect to the power feeding contact 15 may be displaced and the contacts 9 and 15 may not be connected. In order to deal with this, the diameters of both contact points 9 and 15 have conventionally been increased.
There was a problem with the high cost.

Further, since the lifting of the lifting / lowering body 7 is stopped by detecting the lifting / lowering body 7 by the limit switch 8, the wire rope 3 is affected by the variation of the mounting position of the switch 8 and the variation of the operation of the switch 8. The height position of the lifting / lowering body 7 at the time when the winding is stopped varies depending on the electric lifting device. Accordingly, the amount of bending of the contact spring 12 cannot be made constant, so that the contact pressure between the contacts 9 and 15 due to the amount of bending of the contact spring 12 may be insufficient. In such a case, the contact resistance of both contacts 9 and 15 becomes large, and these contacts 9 and 15 become high temperature. Therefore, there is a problem that the electrical insulators 11 and 18 of the contact parts are highly likely to burn out. It was

SUMMARY OF THE INVENTION An object of the present invention is to provide an electric lifting device capable of reliably contacting a power feeding contact and a power receiving contact to make them compact and eliminating the risk of burning the contact.

[0009]

In order to achieve the above object, the present invention is directed to a lifting device body provided with a motor for driving a winding drum which is arranged at a high place on the ceiling side and which winds and unwinds a wire rope. A plurality of power supply contacts provided on the main body and electrically connected to a power source; 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 that are respectively connected to and separated from a power feeding contact and are electrically connected to the electric device, a bottom wall to which the power feeding contact is attached to the lifting device body, and a bottom wall of the bottom wall. A pair of side walls protruding downward from the wall and facing each other, and a pair of side walls formed with a recessed groove provided apart from each other in the lengthwise direction and into which a part of the elevating body is fitted. With stopper protrusion With made the provision of the contact base,
This mounting base is urged downward by the contact block pressing spring,
A pair of fitting projections that are fitted between the facing surfaces of the both side walls are provided on the outer peripheral surface of the elevating body, and both ends of the fitting projections in the length direction and the lower end of the stopper projection are provided. At least one of the contact bases is provided with an inclined surface, and one of the power supply contact and the power reception contact is biased toward the other by a contact spring having an elastic force smaller than that of the contact base pushing spring, and the contact base is detected. A switch for stopping the operation of the motor is attached to the lifting device body.

[0010]

According to the above construction, when the lifting body is lifted and supported by the lifting / lowering device main body, the fitting projections of the lifting body are located between the opposing stopper projections of the contact block just before the lifting is completed. It is fitted smoothly while being guided by the inclined surface. Then, both side walls of the contact base and the stopper projections thereof prevent the elevator body from swinging and rotating, and also prevent the elevator body from moving in a direction orthogonal to the length direction of the side wall. The two upper end portions of the lifting body that are further raised under such regulation conditions are fitted into the recessed grooves of the contact base, so that the recessed groove side portion of the stopper protrusion is engaged with the lifting body to form the side wall. To prevent the lifting body from moving in the length direction. As described above, since the lifting body can be positioned on the contact base so that the receiving contact is accurately opposed to the feeding contact, the receiving contact can be pressed against the feeding contact while compressing the contact spring as the lifting body rises. .. Moreover, since the upper surface of the ascending / descending body contacts the inner end surface of the concave groove, the contact spring is not compressed by the ascending force of the ascending / descending body after that time, and the amount of bending of the contact spring can be made constant. .. Then, after this, the lifting body is raised together with the contact block against the urging force of the contact block pressing spring, so the operation of the motor is stopped by the switch that detects the rise, and the lifting body is supported by the lifting device body. It

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The 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.
This fixture A is equipped with a mercury lamp (not shown) which is turned on when a lamp driving voltage is applied as a pulse.

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. 3, 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 mechanically supporting the elevating body 24 on the elevating device body 22 so as not to accidentally drop.
Is fixed. As shown in FIGS. 1 to 3, four downward guides 71 are integrally projected on the holder 28,
Each guide 71 has a slope 71a as shown in FIG. As shown in FIG. 2, each guide 71 has a lifting body holder 28.
Long protruding length B to the lower end of the lifting body 24 supported by
have. The slope 71a of the guide 71 is the guide 71
It is formed with an inclination that gradually separates from the peripheral surface of the lifting / lowering body 24 supported by the lifting / lowering body holder 28 from the root to the tip.

Shafts 72 are installed between guides 71 facing each other in the width direction of the lifting body holder 28. On these shafts 72, rotatable locking claws 7 that engage with and disengage from a pair of fitting protrusions 78 that are integrally projected from the outer peripheral surface of the upper end portion of the lifting body 24.
3 and a coil spring 74 for urging the claw 73 are attached. As shown in FIGS. 1 and 4, the fitting protrusion 78
Is an overhang-shaped hooking surface 7 on which the hooking claw 73 is disengaged.
8a is provided in the middle part, and the shape seen from the end face is an inverted L-shape, and is fitted in a pair of side walls 62 of the contact point base 60 described later so as to be insertable and removable between the opposing faces. The length (the length along the circumferential direction of the elevating body 24) is slightly shorter than the dimension C (see FIG. 7) between the facing surfaces. Inclined surfaces 78b are formed at both ends of the fitting protrusion 78 in the length direction.

The engaging claw 73 supports the elevating body 24 by engaging the engaging surface 78a obliquely from the lower side, and the coil spring 74 is bent in this state. Therefore, when the lifting body 24 is moved further upward so that the tip of the locking claw 73 faces the lower peripheral surface 24b of the lifting body 24, the lower peripheral surface 24b and the locking surface 78a are then separated. Due to the difference in the position in the radial direction, the locking claw 73 is rotated downward by the force of the coil spring 74 so that it does not interfere with the downward movement of the elevating body 24.

In FIG. 1 and FIG. 2, reference numeral 60 designates a lift holder 28.
PBT that has high heat resistance with the contact block placed inside the
It is made of synthetic resin such as (poly / butylene / terephthalate). As shown in detail in FIG. 7, the contact point base 60 includes a rectangular bottom wall 61 having a flat plate shape, and opposite side walls 62 integrally protruding downward from both side edges along the length direction of the wall 61. The side wall 62 is formed with stopper projections 63 provided at both ends thereof so as to extend further downward. Left and right stopper protrusions 63 provided on each side wall 62
The space is a recessed groove 64 into which a part of the lifting body 24 is fitted, and the stopper projection 63 has a sloped surface on the recessed groove 64 side.

As shown in FIG. 5, a plurality of feeding contacts 31 formed by providing a contact layer 66 made of cadmium silver oxide on the lower end surface of a contact body 65 are attached to the bottom wall 61 as follows. There is. That is, the power feeding contact point 31 is fixed to the contact point block 60 by penetrating the mounting hole 60 a provided in the contact point block 60 and screwing and tightening the nut 67 to the screw portion 65 a of the contact point body 65. In FIG. 5, reference numerals 68 and 69 denote a crimping terminal and a spring washer fitted in the screw portion 65 a, and the nut 67 is tightened to feed the power feeding contact 3
The crimp terminal 68, which is pressure-contacted with 1, is attached to the tip of a power supply side lead wire (not shown) connected to the power supply.

The contact table 60 and the ceiling wall 2 of the lifting device body 22
A plurality of contact point pressing springs 76 (see FIGS. 1 and 3) made of coil springs are attached between the contact points 2a and 2a. The spring force of these springs 76 presses the stopper projection 63 of the contact block 60 against the shaft 72 when the lifting / lowering body 24 is not supported, and the locking claw 7 when the lifting / lowering body 24 is not supported.
The elevating body 24 supported by 3 is pressed downward to move the elevating body 2
I'm trying to prevent 4 from moving carelessly.

A limit switch 77 (see FIGS. 8 and 9) is arranged inside the lift holder 28 on the back side (upper side) of the contact base 60. The switch 77 is operated by being pushed by the lifting / lowering body 24 when the lifting / lowering body 24 is raised and arranged at a predetermined position, thereby stopping the winding operation of the wire rope 23 by the motor 25. It has become.

2 and 3, reference numeral 32 denotes a printed wiring board on which a switch and other electric parts 33 are mounted,
Reference numeral 34 is a circuit board to which the relay 35 is attached, 36 is a detection device for detecting tension and looseness of the wire rope 23, and a spring 37
It is formed by a pair of seesaw levers 38 urged by the levers and a micro switch 40 fixed to a base 39 pivotally supporting the levers 38 and turned on / off by the seesaw lever 38.

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 section 26a of the winding drum 26, and the other end of the second winding section 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. 3, 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 and 44 is stretched around a pair of rotatable guide pulleys 46 (see FIG. 1) 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
4 in the final stage of ascent, the engaging surface 7 of the fitting projection 78 is
The engaging claw 29 is automatically engaged with 8a, and the lifting body 24 is mechanically supported by the lifting device body 22. 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. 1 and 3, the lifting / lowering body 24 has a high heat resistance with a short cylindrical metal lifting / lowering body 51 having upper and lower ends opened and a top end opening closed. It is formed of a contact mount 52 made of synthetic resin such as PBT, and a bottom cover 53 made of synthetic resin attached by closing the lower end opening of the lift body 51. The fitting protrusion 78 is integrally provided on the upper portion of the outer peripheral surface of the lift body 51. A pair of notch grooves (not shown) are provided in the peripheral portion of the contact mount 52, and the wire rope 23 hung on the pulley 46 is passed through these notch grooves.

The contact mount 52 has a plurality of thick portions 52a.
(See FIG. 5), and the guide holes 81 are vertically penetrated through these portions 52a. A power receiving contact 82 that comes into contact with and separates from the power feeding contact 31 is penetratingly supported in the hole 81 so as to be vertically slidable. The contact 82 is constantly urged upward by a coil-shaped contact spring 83, and is fitted into a screw portion 82a formed at a lower end portion of the power receiving contact 82 with a diameter smaller than that of an upper portion thereof, as shown in FIG. A flat washer 85 fixed together by a nut 84 prevents the upper washer from coming off. A crimp terminal 86 fixed to a device-side lead wire (not shown) is fitted to the screw portion 82a. The crimp terminal 86 is a flat washer 85 and a nut 8.
It is sandwiched between 4 and.

As shown in FIG. 5, each power receiving contact 82 has a nut 87 serving as a spring receiver fixed to the outer periphery of the upper end portion thereof, and has the threaded portion 82a at the lower portion thereof to form a stepped rod-shaped contact body. A contact layer 89 made of silver cadmium oxide is provided on the upper end surface of 88. The elastic force of the contact springs 83 for urging the power receiving contacts 82 is weaker than that of the contact point pressing springs 76.

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.

Next, the operation of raising and lowering the lifting body 24 and supporting it by the lifting and lowering device main body 21 will be described in detail. As the lifting body 24 suspended as shown in FIG. 8 rises, the lifting body 24 first enters the inside of the holder 28 while being guided by the guide 71 of the lifting body holder 28. At this time, since it is suspended by the wire rope 23, it is easily lifted up and down 2 under the influence of the wind.
4 is displaced with respect to the contact base 60 as shown in FIG. 11, due to the guiding action of the four long guides 71, FIG.
As shown in FIG. 5, the lifting body 24 can be roughly positioned with respect to the lifting body holder 28.

As the lifting / lowering body 24 subsequently rises, the lifting / lowering body 24
The fitting protrusions 78 are fitted between the stopper protrusions 63 facing each other in the width direction of the contact base 60. In this fitting, even if the state immediately before that is slightly displaced from the contact base 60 as shown in FIG. 11, the slanted surfaces 78c provided at both ends of the fitting projection 78 cause the stopper projection. Since the lifting body 24 is slightly rotated while sliding on the lower end of the portion 63, the lifting body 24 can be accurately positioned with respect to the contact base 60 as shown in FIG.

As described above, since the pair of fitting projections 78 of the lifting body 24 are smoothly fitted between the stopper projections 63 facing each other in the width direction of the contact base 60, both side walls 6 of the contact base 60.
2 and the stopper projection 63 thereof prevent the lifting / lowering body 24 from swinging and rotating, and also prevent the lifting / lowering body 24 from moving in a direction orthogonal to the length direction of the side wall 62.
Further, in the state of FIG. 12, the power receiving contact 82 contacts the power feeding contact 31.

Then, under the regulated conditions shown in FIG. 12, the lifting / lowering body 24 is further raised, and the upper surface of the contact base 60 is located at two positions on the back end surface 64a of the concave groove 64 as shown in FIG.
And the outer peripheral surface of the elevating body 24 is engaged with the portion of the stopper projection 63 on the concave groove 64 side. Therefore, movement of the lifting body 24 in the length direction of the side wall 62 is prevented. At the same time, the power receiving contact 82 moves downward against the contact spring 83 as the lifting body 24 moves upward, and the power feeding contact 31 moves.
Is pressed against. Thereby, the lighting fixture A and the power supply are electrically connected. This state is shown in FIG.

While maintaining this electrical connection, the lifting / lowering body 24 is raised while bending the contact point pressing spring 76 and pushing up the contact point 60. Then, when it is raised to a predetermined position, the engaging surface 78 of the fitting projection 78 is
The engaging claw 73 is engaged with a, and the elevating body 24 is attached to and supported by the elevating device body 21. At the same time, the lifting body 24 pushes the limit switch 77 due to the above rise,
The winding operation of the wire rope 23 by the motor 25, that is, the raising operation of the elevating body 24 is immediately stopped. This state is shown in FIGS.

As described above, the power receiving contact 82 can be brought into pressure contact with the power feeding contact 31 by accurately positioning the elevating body 24 with respect to the contact base 60 irrespective of the shake of the ascending body. Therefore, the mutual contact portions of the contacts 31, 82 can be made smaller, and the costs for the contacts 31, 82 can be reduced accordingly.

Moreover, the side wall 62 serves as a stopper, and the upper surface of the lifting body 24 is brought into contact with the inner end surface 64a of the concave groove 64, so that after that time, the contact spring 83 is irrespective of the lifting of the lifting body 24. Is not compressed, this spring 83
The amount of bending of the can be made constant. After obtaining this constant amount of deflection, in other words, the limit switch 77 is pressed to stop the operation of the motor 25 in a state where the contact pressures of the contacts 31 and 82 are constant. Therefore, both contacts 31,
Since the contact pressure of 82 is not affected by the variation in the mounting position of the limit switch 77 and the variation in the operation of the switch 77, the contact resistance between the contacts 31 and 82 is increased, and the contact portions are heated to a high temperature. There is no danger of burning.

The present invention is not limited to the above embodiment. For example, the lift holder 28 may be omitted. In that case, the upper end of the contact point pressing spring 83 may be fixed to the ceiling wall 22a, and the lower end may be fixed to the contact point 60, and the lifting stop of the elevating body 24 that has reached the raised position is a motor with a brake. Wire rope 2 braked at 25
Made in 3. Contrary to the above-described embodiment, the power receiving contact 82 is attached to the elevating body 24 so that the power receiving contact 82 cannot move up and down.
1 may be attached to the contact base 60 so as to be movable up and down, and the power supply contact 31 may be biased downward by the contact spring 83.

[0038]

As described in detail above, in the electric lifting apparatus of the present invention, the swinging and rotating of the lifting body immediately before the end of lifting, and the movement of the lifting body in the length direction of the side wall of the contact base, Since the lifting body can be positioned on the contact stand by preventing movement of the lifting body in the direction orthogonal to the length direction of the side wall, the power feeding contact and the power receiving contact can be surely brought into contact with each other, and they can be made small. In addition to being inexpensive, the motor can be stopped by a switch that detects the lift of the lifting body while the lifting body is in contact with the inner end surface of the concave groove to keep the amount of deflection of the contact spring constant, so there is variation in the switch. It is possible to secure a constant contact pressure between the power supply contact and the power reception contact by the contact spring without being affected by the variation of the mounting position and the mounting position, and prevent the contact portion from being burned due to poor contact.

[Brief description of drawings]

FIG. 1 shows an electric lifting device according to an embodiment of the present invention in a state in which the lifting body is separated from the lifting device body, Z- in FIG.
Sectional drawing shown along the Z line.

FIG. 2 is a side view showing the electric lifting device according to the same embodiment with its covers removed.

FIG. 3 is a diagram showing an electric lifting device according to the same embodiment, with its covers removed, looking up from the direction of arrow Y in FIG.

FIG. 4 is a perspective view showing a lift body and a contact mount of the lift body separately according to the same embodiment.

FIG. 5 is a cross-sectional view showing a power feeding contact and a power receiving contact according to the same embodiment.

FIG. 6 is a perspective view showing a state where an electric lifting device according to the same embodiment supports a lighting fixture.

FIG. 7 is a perspective view showing a contact base according to the same embodiment.

FIG. 8 is a diagram schematically showing a state where the lifting body is separated from the lifting device body of the electric lifting device according to the same embodiment.

FIG. 9 is a diagram schematically showing a state in which a lifting body is supported by a lifting device body of an electric lifting device according to the same embodiment.

FIG. 10 is a diagram schematically showing the electric lifting device according to the same embodiment when looking up from the direction of arrow X in FIG. 9.

FIG. 11 is a view for explaining a contact positioning operation of the electric lifting device according to the same embodiment.

FIG. 12 is a view for explaining a contact positioning operation of the electric lifting device according to the same embodiment.

FIG. 13 is a view for explaining a contact positioning operation of the electric lifting device according to the same embodiment.

FIG. 14 is a diagram schematically showing a configuration of an electric lifting device.

FIG. 15 is a cross-sectional view showing a power feeding contact and a power receiving contact of a conventional electric lifting device.

[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, 60 ... Contact base, 61 ... Bottom wall, 6
2 ... Side wall, 63 ... Stopper projection, 64 ... Recessed groove, 76 ... Contact base pushing spring, 77 ... Limit switch, 82 ... Power receiving contact, 83 ... Contact spring, A ... Lighting fixture (electrical device).

Claims (1)

Claim: What is claimed is: 1. A lifting device main body provided with a motor for driving a winding drum for winding and rewinding a wire rope, which is arranged at a high place on the ceiling side, and a power supply provided in the main body. A plurality of power supply contacts electrically connected, and an elevating body that is suspended by the wire rope and that is elevated by connecting an electric device,
An electric lifting device, comprising: a plurality of power receiving contacts provided on the lifting body, each of which is brought into contact with and separated from each of the power feeding contacts and is electrically connected to the electric device, wherein the power feeding contacts are attached to the lifting device body. A bottom wall, a pair of side walls projecting downward from the bottom wall and facing each other, and these side walls are provided apart from each other in the longitudinal direction, and a part of the elevating body is fitted between them. A contact stand formed with a pair of stopper projections having concave grooves formed therein, and the contact stand is urged downward by a contact stand pressing spring, and the both side walls are provided on the outer peripheral surface of the elevating body. A pair of fitting projections that are fitted between the facing surfaces of the fitting projections, and at least one of the both ends in the length direction of the fitting projections and the lower end of the stopper projection is provided with an inclined surface, Contact that has less elastic force than the contact block push spring A switch for urging one of the power feeding contact and the power receiving contact toward the other, and a switch for detecting the contact stand and stopping the operation of the motor is attached to the lifting device body. Electric lifting device.