JPH08129906A - Electric hoist - Google Patents

Abstract

PURPOSE: To provide an electric hoist that prevents a wire rope from loading with weight of an elevation body coupled with an electric device, improves safely, and prevents contact inferior of electric contact between the power supply side and a device side. CONSTITUTION: A center guide 31 and a center shaft 51 for positioning are provided in the central position between a hoist main body 22, which is provided with power supply side electric contacts 38 and arranged high in a ceiling side, and an hoisted body 24, which is provided with device side electric contacts 66 and suspended from the main body 22 by a wire rope 23. Two lock shafts 32 positioned in both sides of the guide 31 is made to project to the main body 22 and lock jaws 54 engaged/disengaged with the lock heads 32a of the lock shafts 32 which are positioned in the both sides of the shaft 51 at the ceiling side set position are mounted on the elevating body 41. Rotation stopper projection parts 56 are provided in the inside of wall parts 43b of the elevating body 41, which are opposed to each other across the jaws, and it is characterized that gap(g) between this and the heads 32a, which are inserted between the lock jaws 54, is made small.

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 lifting and lowering electric equipment such as lighting equipment arranged in high places on the ceiling such as factories, gymnasiums, and arenas.

[0002]

2. Description of the Related Art FIG. 10 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 gymnasium. The main body 1 is provided with a winding drum 3 that winds and unwinds the wire rope 2 by being normally and reversely rotated by a motor (not shown). Further, a lock case 4 made of aluminum die-cast and protruding downward is attached to the central position of the lifting device body 1.

The lock case 4 has a trumpet-shaped guide end 4b whose diameter increases toward the lower end of the straight pipe portion 4a.
And has a groove 4c extending in the axial direction on the inner surface. One lock claw 5 is rotatably attached to the straight pipe portion 4a via a pivot shaft 6. The lock claw 5 is always biased by a torsion spring (not shown) so as to be directed obliquely downward, and is rotatable upward against the biasing force.

Reference numeral 7 in FIG. 10 is an elevating body, which is provided with an elevating body 9 having a pair of guide pulleys 8 incorporated therein, and the guide pulley 8 is provided with the wire rope 2 unwound from the winding drum 3. The middle part is stretched over. As a result, the elevating body 7 is suspended by the wire rope 2, and the elevating body 7 is moved up and down by winding and rewinding the wire rope 2 by the winding drum 3. A lighting fixture 10 is attached to the lower surface of the lift body 9. In addition, 11 in FIG.
Is a guide plate, and 12 is a coil spring that supports the plate 11 from below.

An upward lock shaft 13 is provided at the central position of the lifting body 9 so as to project therefrom. At the upper end of this shaft 13,
The downward engaging step portion 14 and the relief concave portion 15 which is continuous to the lower side thereof.
And a pin 16 is provided so as to project in the direction perpendicular to the axis as shown in FIG. This lock shaft 1
3 together with the lock case 4 to which the lock claw 5 is attached serves as a locking means for mechanically supporting the lifting body 7 on the lifting device body 1 when the lifting body 7 is lifted to the ceiling-side set position. There is. The pin 16 is engaged with the groove 4c so as to be able to be taken in and out.

In the above structure, when the lifting / lowering body 7 is lifted, the lock shaft 13 is inserted into the lock case 4 and pushes up the lock claw 5. Then, when the ceiling-side set position is reached, at that time point, the lock claw 5 is obliquely directed upward as shown by the chain double-dashed line in FIG. 10 and is hooked from below on the engaging step portion 14, so that the lifting body 7 is locked. Supported by means. In this supporting state, the pin 16 is inserted into the groove 4c,
The lifting body 7 is prevented from rotating by these engagements (see FIG. 9).

In order to release the locked state, first, the lifting body 7 is slightly lifted to lock the claws 5.
Is made to face the recess 15 and is rotated downward in the recess 15. As a result, the lock claw 5 has a forward posture with respect to the direction in which the lock shaft 13 is pulled out from the lock case 4. Therefore, next, the elevating body 7 can be lowered by unwinding the wire rope 2.

[0008]

However, in the above-mentioned prior art, the locking means for holding the elevating body 7 at the ceiling-side set position is provided only at one central portion.
If the locking function of this one locking means is impaired for some reason, there is a problem that the weight of the lifting body 7 and the lighting fixture 10 is applied to the wire rope 2.

When the lifting / lowering body 7 is lifted to the set position on the ceiling side, the lifting / lowering body 7 to which the lighting fixture 10 is connected is lifted while swinging or tilting. Therefore, a sufficient clearance is provided in these fitting portions so that the lock shaft 13 can smoothly enter the lock case 4 regardless of such behavior, and accordingly, the pin 16 is naturally provided.
Since the clearance between the groove 4c and the groove 4c is also large, the lifting / lowering body 7 can be largely rotated in the axial direction of the lock case 4 according to the large clearance.

Therefore, by this rotation, the device-side electric contact (not shown) on the elevating body 7 side and the power-source-side electric contact (not shown) on the elevating device body 1 side, which is brought into contact with and separated from the elevating body 7 as the contact elevates. Since the contacts are likely to be displaced, there is a high possibility that a contact failure between the contacts is likely to occur.

An object of the present invention is to prevent the weight of a lifting body which is connected to an electric device and is elevated at a ceiling-side set position from being applied to a wire rope for moving the lifting body, thereby improving safety. An object of the present invention is to provide an electric lifting device that can prevent a contact failure between the electric contacts on the power source side and the appliance side.

[0012]

In order to achieve the above object, an electric lifting device according to the present invention comprises a motor for driving a winding drum for winding and unwinding a wire rope, which is arranged at a high place on the ceiling side. It has a lifting device body, a power source side electrical contact arranged on the device body side, and a lifting body body with a pair of guide pulleys incorporated therein, and is suspended by the wire rope suspended on the guide pulleys. In addition, an elevating body that is connected to an electric device and is moved up and down, a device-side electric contact that is supported by the elevating body and that comes in contact with and separates from the power source-side electric contact when the elevating body moves up and down, A trumpet-shaped guide end portion having a larger diameter toward the center is provided, and a center guide projecting downward at the center position of the lifting device body,
At least two lock shafts located on both sides of the center guide and projecting downward from the lifting / lowering device main body, and having a lock head with an engaging step at the lower end;
Center shafts projecting upward from the center of the lifting body and inserted into and removed from the center guide by raising and lowering the lifting body, and inverted C-shapes on the lifting body located on both sides of the center shaft. Two or more sets that are arranged in a rotatably manner and are rotatably provided by being biased by a torsion spring, and that are engaged with and disengaged from the engagement step portion at the ceiling-side set position of the elevating body by the rotation Lock claws and the lock claws that are provided on the inner surfaces of the walls of the elevating / lowering body that face each other with the lock claws interposed therebetween. And a rotation stopper protrusion having an inclined surface.

[0013]

In the above-mentioned structure, the lock shaft on the side of the lifting device, the pair of lock pawls on the lifting body and the torsion spring for urging the pawls form the locking means. The pair of locking claws
The lock shaft is engaged with the engagement step portion of the lock shaft from both sides in the radial direction, and the weight of the lifting body is received so that the tips of the lock shaft are brought closer to each other, and the lock shaft is clamped. This mechanically supports the lifting body raised to the ceiling-side set position with respect to the lifting apparatus body.

The center guide and the center shaft are fitted to each other, and the guiding action thereof raises and lowers the lifting body to the ceiling-side set position while tilting and touching the center position of the lifting body with respect to the center position of the lifting device body. Guide to the set position on the ceiling side while positioning so that they fit together. Further, since the plurality of locking means are separately provided on both sides of the positioning means, even when the locking function of one of the plurality of locking means is impaired, the lifting and lowering by the other locking means is performed. The mechanical support of the body can be maintained.

The inclined surface on the upper portion of the rotation stopper convex portion provided on the lifting body allows the lock head of the lock shaft to be smoothly introduced between these stopper convex portions. Then, the rotation stopper convex portion hits the lock head of the lock shaft introduced between them, and prevents the lifting / lowering body from rotating around the center guide and the center shaft fitted thereto.

In this case, since the rotation stopper convex portion is close to the lock head to narrow the gap between them, and the rotation stopping means is located at a position far from the center guide and the center shaft, it is possible to move up and down. The angle at which the body can rotate around the center guide and the center axis can be made extremely small. As a result, it is possible to prevent the appliance-side electrical contact pressed against the power-source-side electrical contact due to the elevating body being arranged at the ceiling-side set position from largely deviating from the power-source-side electrical contact.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. As shown in FIGS. 1 to 3, the electric lifting device 21 includes a lifting device main body 22 and a lifting and lowering device 22 that is suspended below the main body 22 via a wire rope 23 and is lifted during maintenance and inspection. And a body 24. The lifting / lowering device body 22 is arranged at a ceiling-side high place such as a gym. Lifting body 2
At the bottom of 4 is a lighting device 2 such as a mercury lamp as an electric device.
5 are connected. In addition, reference numeral 26 in FIG. 1 denotes a connecting metal fitting fixed to the lower end of the lifting body 24, and the lighting fixture 25 is attached to the lower surfaces of both end portions in the longitudinal direction of the metal fitting 26.

As shown in FIGS. 3 and 5, a forward / reverse rotatable motor 27 is fixed to the lower surface of the base 22a of the lifting / lowering device main body 22. The motor 27 has a non-excitation actuated electromagnetic brake and a deceleration portion, and a winding drum 28 is connected to the output end of the deceleration portion. In addition, 29 in FIGS. 2 and 3 is a circuit board on which electric parts 29a such as a terminal block, a switch, and a relay are mounted.

As shown in FIG. 3, a stand metal fitting 30 is fixed between the motor 27 and the circuit board 29 on the lower surface of the base 22a of the lifting / lowering device main body 22, and the center of the lower surface of the metal fitting 30 is substantially fixed. A center guide 31 protruding downward is attached to the portion. This center guide 31
Is disposed at the central position of the lifting / lowering device main body 22 and, as shown in FIG. 5, a straight pipe portion 31 having a circular cross section.
The lower end of a is provided with a trumpet-shaped guide end 31b having a larger diameter toward the lower side.

Base 2 as shown in FIGS. 2 and 5.
On the lower surface of 2a, two downward lock shafts 32 are provided on both sides of the center guide 31 and at symmetrical positions about the lock shaft 32. The lower ends of the lock shafts 32 form a lock head 32a having a tapered tip.

The lock head 32a has a diameter larger than that of the shaft portion above the lock head 32a, and the engagement step portion 3 is provided on the upper portion thereof.
2b. The engagement step portion 32b is the lock head 32.
It is formed by an annular upwardly facing step portion formed by removing the entire upper periphery of a. However, instead of this configuration, the upper peripheral surface of the lock head 32b is partially removed from the upper surface of the head 32b to form a pair of engagement step portions positioned corresponding to the radial direction of the lock shaft 32. Good.

As shown in FIGS. 2 and 3, the stand fitting 30 is provided with a plurality of cylindrical support shafts 33 protruding downward. These shafts 33 are parallel to the axis of the lock shaft 32. A contact plate 34 made of a steel plate is arranged below the stand metal fitting 30, and support shafts 33 are respectively loosely inserted in through holes (not shown) provided at the four corners thereof. Washers 35 (see FIG. 2) as retaining members are screwed to the lower ends of the support shafts 33, respectively. A center guide 31 and two lock shafts 32 pass through the contact block 34.

A pair of coil springs 36 around which the lock shaft 32 is wound are sandwiched between the stand fitting 30 and the contact base 34, and the contact base 3 is urged by the springs 36.
4 is pressed and held by the washer 35 in the free state. Further, the contact point base 34 is provided so as to be vertically movable above the washer 35 with the support shaft 33 as a guide, with the elastic deformation of the coil spring 36.

As shown in FIG. 5 and the like, the lower surface of the contact base 34 is electrically insulated from the base 34, and a plurality of power source side electric power sources urged downward by springs 37 are movable up and down. Contact points 38 are respectively attached. These contacts 3
Reference numeral 8 is electrically connected to the circuit board 29 and the like via lead wires.

A reference numeral 39 in FIG. 1 is a cover having an opening 39a through which the contact base 34 is projected, and is attached to the base 22a so as to cover up parts other than the contact base 34.

As shown in FIG. 2 to FIG.
Reference numeral 4 includes an elevating body 41 made of a steel plate. This body 4
1 is formed by connecting a pair of steel plate lock guides 43 on the lifting body base 42 and also connecting a bottom plate 44 to the lifting body base 42 so as to close the lower surface thereof. The bottom plate 44 has the connecting fitting 26.
Is fixed.

The lifting / lowering body base 42 includes a horizontal wall 42a and a pair of side walls 42 bent vertically downward from both side edges thereof.
b, and has a substantially U-shaped cross section with an open lower surface. Pulley shafts 45 spanning both side walls 42b are laterally provided at both ends of the base 42 in the longitudinal direction, and guide pulleys 46 are rotatably supported by the pair of pulley shafts 45, respectively.

Both the lock guides 43 are also composed of a horizontal wall 43a and a pair of side walls 4 which are bent vertically downward from both side edges thereof.
3b and has a substantially U-shaped cross section. These lock guides 43 are connected to the upper surface of the lifting / lowering body base 42 by fixing the side walls 43b to both ends in the longitudinal direction of the wall 42a so as to be separated from each other.

A pair of upper rope passage portions 47 are provided on the walls 43a of both lock guides 43, and a pair of lower rope passage portions 48 opposed to the rope passage portions 47 are provided on the wall 42a of the lift base 42. ing. The upper rope passage portion 47 is formed by a notch groove, and the lower rope passage portion 48 is formed by a through hole.

The wire rope 23 has one end fixed to the winding drum 28 and wound up, and the other end fixed to the stand fitting 30. Note that FIG.
The middle 49 is a rope support fitting for fixing the wire rope 23 to the stand fitting 30. The middle portion of the wire rope 23 has upper and lower rope passage portions 47, 48 of the lifting device body 41.
The wire rope 23 suspends the elevating body 24 by being wound around the pair of guide pulleys 46 and drawn around. Therefore, when the wire rope 23 is wound around the winding drum 28, the elevating body 24 is raised, and conversely, when the wire rope 23 is paid out from the winding drum 28, the elevating body 24 is lowered.

The wall 42 of the lifting / lowering body 41 having the above structure
At the center position of "a", a center shaft 51 which is put in and taken out from the center guide 31 by the elevation of the elevating body 24 is provided so as to project upward. The center shaft 51 has a tapered front end, and this front end is positioned higher than the wall 43 a of the lock guide 43. The diameter of the portion other than the tip portion of the center shaft 51 is slightly smaller than the inner diameter of the straight pipe portion 31a of the center guide 31. The center shaft 51 and the center guide 31 form a positioning unit that positions the central position of the lifting body 24 at the central position of the lifting device body 22.

As shown in FIG. 5, both lock guides 43
Openings 52 are formed in the respective walls 43a of the respective walls 43a so as to correspond to the pair of lock shafts 32. These openings 52 are provided at positions equidistant from the center shaft 51 as a boundary, and the lock shaft 32 is lifted by raising and lowering the elevating body 24.
The lock head 32a has a rectangular hole of a size that can be inserted and removed.

Both lock guides 43 have side walls 43.
A pair of claw shafts 53 extending across b are horizontally mounted, and a lock claw 54 is rotatably attached to each of these shafts 53 so as to face the opening 52. Therefore, in this embodiment, two pairs of lock claws 54 are provided in the lifting device body 41. These two sets of lock claws 54 are provided at positions equidistant from both sides of the center shaft 51 as shown in FIGS. 5 and 6, in other words, at symmetrical positions about the center shaft 51. It is arranged.

The pair of lock claws 54 in each set are biased in the opposite directions by a torsion spring 55 (see FIGS. 6 to 8) provided by winding the claw shaft 53, and thus the inverted c-shape. It is held with the arrangement. The pair of lock claws 54 have the same size, and when they are in a horizontal posture and their toes are closest to each other, the gap between the toes is the engagement of the lock head 32a of the lock shaft 32. The size is smaller than the dimension A (see FIG. 5) between the step portions 32b. Further, the diameter B (see FIG. 5) of the shaft portion of the lock shaft 32 above the lock head 32a is smaller than the gap.

Lock head 3 with the engaging step portion 32b
A lock means is formed by the lock shaft 32 having 2a, and a pair of lock claws 54, claw shafts 53, torsion springs 55, etc. at corresponding positions. By this locking means,
When the lifting body 24 is lifted to the ceiling-side set position, it is mechanically supported by the lifting device body 22.

Both side walls 43b of both the lock guides 43
Respectively have rotation stopper protrusions 56 protruding inside the guides 43. The rotation stopper convex portions 56 facing each other are provided so as to extend in the vertical direction, and most of them which are parallel to each other are close to the lock head 32a passed between the pair of lock claws 54 so that they can come into contact with each other. Is. In other words, the distance between the parallel portions is slightly larger than the diameter of the lock head 32a, so that the gap g between the rotation stopper protrusion 56 and the lock head 32a passed between the pair of lock pawls 54 (see FIG. 7) is formed to be small. In addition, the upper portion of the rotation stopper convex portion 56 has the lock head 32a between them.
The inclined surface 56a (see FIGS. 7 and 8) is formed in order to facilitate the introduction.

The rotation stopper protrusions 56 may be provided on only one of the side walls 43b, but in this embodiment, the rotation stopper protrusions 56 are provided on both side walls 43b.
It is excellent in that the possibility that the lock head 32a is caught on the edge of the opening 52 can be further reduced.

In the present invention, the two lock shafts 32 and the two sets of lock claws 54 facing them are
When provided asymmetrically with respect to the center guide 31 or the center shaft 51, the protrusion width of the rotation stopper convex portion 56 located farther from the center shaft 51 is set to the center shaft 51.
It can be implemented by making it smaller than the protruding width of the rotation stopper convex portion 56 located closer to. However, in the configuration of the present embodiment having the symmetrical arrangement as described above, there is no directivity in attaching the lock guides 43 to which the pair of lock claws 54 are attached to the elevating body base 42. It is excellent in that it can be easily assembled.

On the wall 42a of the lift base 42,
A contact base 63 is floatingly attached via four guide shafts 61 and a coil spring 62 wound around each of them. The contact base 63 has a pair of recesses for escaping the lock guide 43 and has a substantially H-shaped planar shape, and a circular through hole 64 is opened in the center thereof. This through hole 6
Reference numeral 4 has a larger diameter than the guide end portion 31b thereof so that the center guide 31 can be inserted and removed. Also, the through hole 6
The guide shafts 61 pass through around each of the four.

On the upper surface of the contact base 63, as shown in FIG. 5 and the like, a plurality of appliance side electric contacts 66 which are vertically urged by springs 65 are attached. These contacts 66 are provided corresponding to the power source side electrical contacts 38, respectively, and are brought into contact with and separated from the corresponding power source side electrical contacts 38 when the elevator 24 is moved up and down.

Further, as shown in FIG. 4, a terminal block 68 is fixed to the outer surface of one side wall 42b of the lift base 42 with an insulating plate 67 interposed therebetween. Lead wires electrically connected to the appliance-side electrical contacts 66 are connected to the terminal block 68. The terminal 68 is electrically connected to the lighting fixture 25.

In the electric hoisting device 21 having the above-described structure, the wire rope 23 is wound around the winding drum 28 at the time of installation and after the maintenance and inspection of the lighting fixture 25 are completed, and the hoisting body 24 located on the ground side is ceilinged. Raise to the side. When the ascending / descending body 24 reaches near the ceiling-side setting position, the center shaft 51 at the center of the ascending / descending body 24 at that time is inserted into the center guide 31 at the center of the ascending / descending device body 22. .

The lock heads 32a of the two lock shafts 32 are passed through the opening 52 of the lock guide 43 by the subsequent elevation of the lifting / lowering body 24, and the pair of lock claws 54 facing the opening 52 are twisted. While pushing downwards against the spring 55, the appliance-side electric contact 66 and the power-side electric contact 38 come into contact with each other while compressing the springs 65 and 37 for biasing them.

In the above-described operation, the lifting / lowering body 24 is tilted so that one end on the winding drum 28 side is high and the other end on the rope support fitting 49 side is low, or there is a swing that moves in the thickness direction of the lifting / lowering body 24. May be accompanied by an increase. However, since the guide end portion 31b of the center guide 31 is in the shape of a trumpet, the center guide 3 is not affected by the introduction action of the inner peripheral surface thereof regardless of the slight inclination or swing of the elevating body 24.
The center shaft 51 can be smoothly inserted into the shaft 1.
Thereby, the central position of the lifting / lowering device main body 22 and the lifting / lowering body 24
Positioning is performed to match the central position of.

Moreover, the upper power source side contact base 34 is supported by the coil spring 36, and the lower equipment side contact base 63 is supported by the coil spring 62 in a floating manner. Since it elastically deforms in accordance with the inclination and the inclination, the posture of the lifting body 24 can be supplementarily corrected by the reaction force at that time. Of course, the spring 37 as described above,
Due to the bending of 65 and the bending of the coil springs 36 and 62, sudden contact between both contacts 38 and 66 is softened and vibration is softened.
The contacts 38 and 66 can be pressed against each other while preventing a large load from being applied to the contacts 38 and 66.

As described above, the lifting / lowering body 24 is centered while its posture is corrected.
Is straightly lifted by using the straight pipe portion 31a of the center guide 31 as a guide, and thus is lifted to the ceiling-side set position without tilting or touching. Thus the lifting body 2
When 4 reaches the setting position on the ceiling side, at that time, the lifting body 24 is mechanically supported by the locking means.

That is, the two pairs of lock claws 54 attached to the elevating body 24 are held in an inverted C-shape as shown by the solid line in FIG. 5 in the unloaded state. Then, as described above, immediately before the elevating body 24 reaches the ceiling-side set position, first, the lock heads 32a of the lock shafts 32 contact the pair of lock claws 54 held in the inverted C-shape. After that, the lock head 32a is passed between the pair of lock claws 54 while rotating and pushing the pair of lock claws 54 downward against the torsion spring 65.

At the same time when the elevating body 24 reaches the ceiling-side set position, the tips of the pair of lock claws 54 face the engaging stepped portion 32b formed on the upper portion of the lock head 32a. The lock claws 54 are slightly moved upward by the spring force of the torsion spring 65 and are engaged with the engaging step portions 32b. Thereby, the lifting device body 2
An elevating body 24 is mechanically supported with respect to 2. This state is shown by the chain double-dashed line in FIG.

In this mechanically supported state, the pair of lock claws 54 that hold the inverted C-shape receive a force in the upward opening direction due to the weight of the elevating body 24 that supports the lighting fixture 25. Therefore, the pair of lock claws 54 located on both sides in the radial direction of each lock shaft 32 tend to rotate so that their tips approach each other. Therefore, since the pair of lock claws 54 securely holds the lock head 32a of the lock shaft 32 from both sides in the radial direction, the elevating body 24 can be mechanically supported (locked) stably at the ceiling-side set position.

Since the elevating body 24 is locked at the ceiling-side setting position as described above, the normal wire rope 23 is
The weight of the lifting / lowering body 24 supporting the lighting fixture 25 is not applied as a load.

Not only that, the locking means for fixing the lifting / lowering body 24 to the ceiling-side set position as described above is not located at one central position of the electric lifting / lowering device 21, but on both sides of the positioning means for centering. Since each of them is provided, even if the locking function of one of the plurality of locking means is lost for some reason, the lifting body can be supported by the other locking means.

Accordingly, even in the above case, it is possible to prevent the weight of the elevating body 24 to which the lighting fixture 25 is connected from being applied to the wire rope 23 at the ceiling-side setting position. Therefore, the safety of the electric lifting device 21 can be further improved.

Moreover, as described above, the lifting body 2 is provided at a plurality of locations.
4 is supported, the tilt and swing of the lifting / lowering body 24 at the ceiling-side setting position can be reduced as compared with the case where the lifting / lowering body 24 is locked only at its center position, and the set state can be stabilized. Since the load on the support portion of the lock claw 52 due to the weight of the lifting / lowering body 24 to which the lighting fixture 25 is connected can be reduced, the reliability of mechanically supporting the lifting / lowering body 24 at the ceiling-side setting position can be improved.

In the above-described locking operation for the lifting body 24, the lock head 32a of the lock shaft 32 that has passed through the opening 52 of the lock guide 43 of the lifting body 41 is provided on the inner surface of the side wall 43b of the lock guide 43. It is inserted between the rotation stopper convex portions 56. By the way, these convex portions 5
Since the upper portion of 6 has an inclined surface 56a, the lock head 32a is guided to the inclined surface 56a without being caught by the upper portion of the rotation stopper convex portion 56. As a result, the lock head 32a is smoothly introduced between the opposed stopper protrusions 56 and is engaged with the pair of lock claws 54 as described above.

The side wall 43b of the lock guide 43 hits the lock head 32a introduced between them, so that the elevating body 41 of the elevating body 24 locked at the ceiling-side set position is fitted to the center guide. It prevents the shaft 31 and the center shaft 51 from rotating around the axis. In this case, the side wall 43b is provided with a rotation stopper convex portion 56 projecting to the inner surface thereof, and these are provided in the lock head 32a.
And the gap g between them is set narrower.
Moreover, since this rotation stopping portion is located away from the center guide 31 and the center shaft 51, the lifting body 24
The angle θ1 (see FIG. 6) at which the can rotate about the axis can be made extremely small.

Therefore, as described above, the apparatus-side electrical contact 66, which is pressed against the power-source-side electrical contact 38 by being arranged at the ceiling-side set position, can be displaced largely with respect to the power-source-side electrical contact 38. Since they can be suppressed, both contacts 38, 66 can be reliably elastically contacted with a large area. Therefore, the electrical contact 3 between the power supply side and the instrument side
It is possible to prevent the contact failure of Nos. 8 and 66.

Further, in this embodiment, the lifting body 4
1 has the lock guide 43, and the wire rope 23 is passed through the rope passing portion 47 provided therein,
The exit height of the wire rope 23 in 4 is closer to the tip end side of the center shaft 51 depending on the height of the lock guide 43. Therefore, the swing angle θ2 (see FIG. 8) of the center shaft 51 when the lift 24 is raised can be reduced.

That is, the apparent fulcrum about which the center shaft 51 tilts is the root of the shaft 51 (if there is a fulcrum at this root, the lifting body swings with this fulcrum as a fulcrum.
The deflection angle at that time is large. ) Instead of the upper rope passing portion 47, the center shaft 51
The deflection angle θ2 of is reduced. In this way, the swing of the lifting body 24 can be suppressed to a small level, so that when the lifting body 24 is raised,
Even if this shakes, the center shaft 51 of the lifting device body 2
Make sure that it is inserted into the center guide 31 of No. 2,
Accordingly, the lifting body 24 can be easily arranged at the ceiling-side set position.

In order to release the lock when lowering the lifting / lowering body 24 to the ground side, first, the wire rope 23 is wound up to raise the lifting / lowering body 24 slightly, and the lifting / lowering body 24 is arranged in an inverted C shape. The pair of lock claws 54 are removed right above the lock head 32a of the lock shaft 32, whereby the lock is released. By the way, the lock head 3 of the lock shaft 32
The shaft portion above 2a has a diameter smaller than that of the lock head 32a so as not to prevent the pair of lock claws 54 that are about to be arranged in the C-shape from being turned upward.

Therefore, next, when the wire rope 23 is unrolled and the elevating body 24 is lowered, the lock shaft 32 is relatively moved through the pair of lock claws 54 arranged in a V shape. Lock head 32
The a pushes the pair of lock claws 54 upwards while resisting the biasing force of the torsion spring 55, and passes through the lock claws 54. Therefore, the lifting / lowering body 24 is lowered without being disturbed by the locking means.

The present invention is not limited to the above embodiment. For example, although two sets of lock mechanisms are provided in the above-mentioned one embodiment, more lock mechanisms may be provided.

[0062]

As described above in detail, according to the electric hoisting device of the present invention, the hoisting body that is hoisted to the ceiling set position is
Locking means for mechanically supporting the elevating body lifted to the ceiling set position to the elevating device body are provided on both sides of the positioning part including the center guide and the center shaft for positioning with respect to the elevating device body. If the lock function of one of the plurality of locking means is impaired, the lifting body can be supported by the other locking means, and therefore the weight of the lifting body to which the electric device is connected at the ceiling-side setting position is reduced by the wire rope. It is possible to prevent safety and improve safety. In addition, a rotation stopper convex portion that prevents the lifting / lowering body from rotating in the axial direction of the center guide at a position apart from the center guide is provided, and the angle at which the lifting / lowering body can rotate in the axial direction of the center guide is extremely small. As a result, it is possible to prevent the appliance-side electrical contacts pressed against the power-source-side electrical contacts by being placed in the ceiling-side set position from shifting significantly with respect to the power-source-side electrical contacts. It is possible to prevent the contact failure of the electrical contact with.

[Brief description of drawings]

FIG. 1 is a perspective view showing the overall configuration of an electric lifting device according to an embodiment of the present invention.

FIG. 2 is a front view showing a state in which a lifting body is set in a lifting device body of the electric lifting device according to the embodiment.

FIG. 3 is a side view showing a state in which an elevating body is set in the elevating device body of the electric elevating device according to the embodiment.

FIG. 4 is a perspective view showing a disassembled part of an elevating body included in the electric elevating device according to the embodiment.

FIG. 5 is a diagram schematically showing the overall configuration of the electric lifting device according to the embodiment.

FIG. 6 is a schematic cross-sectional view showing a state in which the lifting body is set in the lifting device body of the electric lifting device according to the embodiment, taken along line ZZ in FIG.

FIG. 7 is a side view showing an elevating body included in the electric elevating device according to the embodiment with a lock shaft inserted therein.

8 is a cross-sectional view of a part of the lifting body taken along line YY in FIG.

FIG. 9 is a cross-sectional view showing a locked state by a lock means of an electric lifting device according to a conventional example, taken along line XX in FIG.

FIG. 10 is a diagram schematically showing a configuration of an electric lifting device according to a conventional example.

[Explanation of symbols]

 21 ... Electric lifting device, 22 ... Lifting device main body, 23 ... Wire rope, 24 ... Lifting body, 25 ... Lighting fixture (electrical device), 27 ... Motor, 28 ... Winding drum, 31 ... Center guide, 31a ... Straight pipe Part, 31b ... Guide end part, 32 ... Lock shaft, 32a ... Lock head, 32b ... Engaging step part, 38 ... Power source side electric contact, 41 ... Elevating body, 43b ... Wall provided with rotation stopper convex part, 46 ... Guide pulley, 51 ... Center shaft, 54 ... Lock claw, 55 ... Torsion spring, 56 ... Rotation stopper convex portion, 56a ... Slope, 66 ... Instrument side electric contact.

Claims (1)

[Claims] 1. A lifting 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 the ceiling side, and a power source side electric contact arranged on the device main body side. An elevator body having a pair of guide pulleys built-in, being suspended by the wire rope suspended on the guide pulleys and being elevated by connecting an electric device, and supported by the elevator body The power source side electrical contact is provided with an instrument side electrical contact that is brought into contact with and separated from the power source side lifting and lowering of the lifting body, and a trumpet-shaped guide end portion having a larger diameter toward the lower end of the straight pipe portion. A center guide is provided so as to project downward at a central position of the main body, and a lock head is provided at both sides of the center guide so as to project downward at the elevating device main body and a lock head having an engaging step portion at a lower end portion. Less Also, two lock shafts, a center shaft projecting upward at a central position of the elevating / lowering body, and a center shaft that is moved in and out of the center guide by elevating / lowering the elevating / lowering body, and are respectively positioned on both sides of the center shaft. The lifting step body is arranged in an inverted V shape and is rotatably provided by being biased by a torsion spring, and by the rotation, the engaging step portion is set at the ceiling side set position of the lifting step body. Two or more sets of lock claws that are engaged with and disengaged from the lock head, and a pair of lock claws that are placed between the lock claws that are provided on the inner surfaces of the walls of the elevating body that face each other with the lock claws interposed therebetween. An electric lifting device provided with a rotation stopper convex portion having a sloped surface on the top as close as possible.