JPH1037452A - Operation cage rising and falling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an operation cage rising and falling device capable of making compact and lightweight even if a rising and falling distance is increased. SOLUTION: An operation cage rising and falling device 10 is equipped with four winding drums 11a, 11b, 12a and 12b corresponding to four wire ropes 8a-8d suspending an operation cage 9, and the wire ropes 8a-8d are systematically wound on the drums 11a, 11b, 12a and 12b in three layers by reciprocating two sheaves 30 and 30a of a guide mechanism 25. By the constitution, the whole device can be compact and lightweight.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevating device for a work cage for winding and unwinding a wire rope for suspending a work cage for working on an outer wall surface of a building structure or the like, and making the work cage compact. In addition, the weight is reduced.

[0002]

2. Description of the Related Art One of the methods for performing work on an outer wall surface of a building structure or the like is to use a work cage suspended from a rooftop or the like and use a worker in the work cage or a work device attached to the work cage. There are things that work.

In order to perform work using such a work cage, as shown in FIG. 11, a traveling carriage 4 traveling on a rail 3 laid along the inside of a parapet 2 on a rooftop 1.
The center of the revolving arm 6 is attached to the distal end of the telescopic arm 5 attached to the vehicle, and the distal end of the wire rope 8 wound around the winding drum 7a constituting the elevating device 7 installed in the traveling carriage 4 is attached to the telescopic arm 5. The wire rope 8 is suspended from both ends of the revolving arm 6 and connected to the work cage 9, and the wire rope 8 is lifted up by winding it up on the winding drum 7 a of the lifting device 7. To be lowered.

A conventional working cage lifting / lowering device 7 is shown in FIG.
As shown in the figure, the working cage 9 is connected to two wire ropes 8,
8, the two winding drums 7 are coaxial.
a, 7a, and a guide mechanism 7b that rotates the respective wire ropes 8, 8 in synchronization with the rotation of the winding drum 7a.
Sheaves 7d, 7d screwed into the square screw shaft 7c
To guide in one direction during ascending / descending and in the opposite direction during descending, so as to wind only one stage in an aligned state around the winding drums 7a, 7a, whereby the winding length of the two wire ropes 8, 8 The inclination of the work cage 9 due to the change in the sheath length is prevented.

[0005]

However, in the lifting / lowering device 7 of the work cage 9 for working on the outer wall surface of a high-rise building or a skyscraper, the lifting distance is long and the wire rope 8
The length of the winding drum 7a in the axial direction must be increased or the diameter of the winding drum 7a must be increased. is there.

In particular, for the purpose of further improving safety, 4
In the lifting device for a four-hanging work cage that is raised and lowered using a wire rope, four winding drums are required,
There is a problem that an increase in the ascending and descending distance causes a further increase in size and weight.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and an object thereof is to provide a lifting apparatus for a working cage which can be made compact and lightweight even if the lifting distance is increased. .

[0008]

According to a first aspect of the present invention, there is provided an elevator apparatus for a work cage, wherein one end of the work cage is connected to the work cage and the other end is wound or fed. A plurality of rotatably driven drums around which a wire rope is wound are provided, and a guide mechanism is provided for guiding each of the wire ropes wound around the plurality of drums by reciprocating in the axial direction of the drum. It is characterized by becoming.

According to the lifting device for a working cage, drums are provided in accordance with the number of a plurality of wire ropes for suspending the working cage, and the wire ropes are reciprocated on these drums by a guide of a guide mechanism to form a multilayer structure. The drum is compact and lightweight.

According to a second aspect of the present invention, in addition to the structure of the first aspect, the guide mechanism is arranged in parallel with the axial direction of the drum, and the rotational force of the drum is reduced. A cam shaft having a groove cam to be transmitted and rotated, a guide reciprocated along the groove cam of the cam shaft, and a guide sheave moved integrally with the guide. Things.

According to this working cage elevating device, the guide mechanism is constructed by integrally providing a guide shaft with a cam shaft having a grooved cam and a guide reciprocated by the grooved cam of the camshaft. While rotating the drum in one direction, the wire rope can be reciprocated neatly in synchronism with the rotation and wound up in multiple layers.

[0012] Further, the lifting device for a working cage according to claim 3 of the present invention, in addition to the configuration according to claim 1 or 2, has four wire ropes and two drums on one axis. While the two provided drum shafts are arranged in parallel, a rotation transmitting mechanism is provided between
It is characterized in that the two driving machines synchronously drive each other.

According to the working cage lifting device, when four working cages are suspended, four drums are arranged on two parallel axes, and a rotation transmission mechanism is provided between them. The change in the winding length can be suppressed as much as possible by driving one unit in synchronization with four units.

According to a fourth aspect of the present invention, in addition to the structure of any of the first to third aspects, the work cage is landed upstream of the guide mechanism with respect to the drum. In this case, a gripping mechanism for preventing the wire rope from being loosened and gripping the wire rope is provided.

According to the lifting device for a working cage, a gripping mechanism for gripping a plurality of wire ropes is provided upstream of the guide mechanism, so that even when the working cage lands, the wire wound on the drum is provided. The rope is prevented from loosening to maintain the alignment, and the working cage is prevented from tilting when it is raised.

According to a fifth aspect of the present invention, in addition to the structure of any of the first to fourth aspects, the lifting mechanism for a working cage according to any one of the first to fourth aspects of the present invention further includes a brake mechanism for preventing the working cage from suddenly descending due to excessive rotation of the drum. A braking mechanism provided on the drum, a ratchet wheel provided on the drum, a detecting mechanism for transmitting the rotating force of the drum via a speed increaser to detect an overspeed by increasing the centrifugal force, and a centrifugal force of the detecting mechanism. And a ratchet pawl provided on a fixed side which is locked to the ratchet wheel.

According to this lifting device for a working cage, a brake mechanism is provided to increase the rotation of the drum and detect over-rotation by centrifugal force, thereby locking the ratchet pawl to the ratchet wheel attached to the drum. In this case, a sudden descent in the event of an emergency can be mechanically stopped and prevented.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. Here, an embodiment in which the invention is applied to a lifting and lowering device for a four-hanging work cage will be described with reference to FIGS.

As shown in an exploded perspective view of FIG. 1, the work cage elevating device 10 is for lifting the work cage 9 by suspending it with four wire ropes 8. It is installed in a traveling vehicle 4 traveling on a rail laid along the inside, or installed in a trackless traveling vehicle or a fixed turning type vehicle.

As shown in the side sectional view of FIG. 2 and the plan view of the drum portion of FIG. 4, the working cage elevating device 10 has two sets corresponding to the four wire ropes 8. A total of four winding drums 11a, 11b, 12a,
12b, and two winding drums 11a, 11b
Are integrally attached to one rotating shaft 13, and the other two winding drums 12 a and 12 b are integrally attached to one rotating shaft 14, and these two rotating shafts 13 and 14 are arranged side by side in parallel. Are located.

The four winding drums 11a, 11b, 12 attached to these two rotating shafts 13, 14 are provided.
a and 12b are provided in a main body frame 18 composed of two side frames 15 and 16 and a plurality of connecting rods 17 connecting them. As shown in FIGS. 5 and 6, the two side frames 15 and 16 of the main body frame 18 are formed in a pentagonal shape in which both sides of a rectangular upper portion are cut off obliquely. , 16 are connected by a plurality of connecting rods 17 at a constant interval to form a main body frame 18.

Each of the rotating shafts 13 and 14 has a bearing 19 between two side frames 15 and 16 of the main body frame 18.
It is rotatably supported through.

The winding drum 11 integrated with the rotating shaft 13
a and 11b are provided with one cylindrical drum main body 11c concentrically with the rotary shaft 13 and fixed to the rotary shaft 13 via both side plates 11d. An annular flange plate 11e protruding beyond the winding height in the case of lap winding is attached, and a partition flange 11f having a substantially U-shaped cross section with the same height is also attached to the outer periphery of the central portion to form two windings. Drum 1
1a and 11ba are configured. A semicircular spiral groove for winding the wire rope 8 in an aligned state is formed on the outer periphery of the winding drums 11a and 11b.

Since the winding drums 12a and 12b integral with the other rotating shaft 14 have the same configuration, the same portions are not included.
Although the symbols 2c to 12f are described and the description is omitted, since the rotating shafts 13 and 14 are driven to rotate in mutually opposite directions, the directions of the spiral grooves on the outer periphery of the winding drum are respectively reversed.

To rotate the winding drums 11a, 11b, 12a, 12b integral with the two rotating shafts 13, 14, one flange plate 11 of the winding drum 11a is driven.
and ring gears 20 and 20a are respectively attached to one of the flange plates 12e of the winding drum 12a so as to mesh with each other, and a pinion driven by a motor 22 via a worm speed reducer 21 on one of the ring gears 20. 23, the four winding drums 11a, 11b, 1 of the two rotating shafts 13, 14 are driven by one motor 22.
2a and 12b are rotationally driven in directions opposite to each other.

The four winding drums 11a, 11
A guide mechanism 25 is provided on each of b, 12a, and 12b so as to overlap and wind the wire rope 8 in multiple layers (for example, three layers) in an aligned state.

As shown in FIGS. 2, 3 and 7, the guide mechanism 25 is disposed above the intermediate portion between the two rotating shafts 13 and 14 in parallel with the two rotating shafts 13 and 14. A guide rail 26 having a U-shaped cross section between the 16
Are mounted at a distance from each other with two openings facing each other, and two guide carts 28, 28a having wheels 27 protruding on both sides rolling in the guide rail 26 are mounted on these guide rails 26. And two guide carts 2
8, 28a are connected by a connecting plate 29 so that they can reciprocate integrally in the axial direction of the winding drums 11a, 11b, 12a, 12b. And each guide cart 28, 2
8a has sheaves 30 and 30a having two guide grooves.
7 are rotatably mounted via bearings, and the positions of the two sheaves 30 and 30a are arranged so as not to overlap as shown in FIG. 7, and the four wire ropes 8 are arranged in a horizontal direction. It can be wound around two sheaves 30 and 30a.

The positions of the two sheaves 30, 30a are reciprocated in synchronization with the rotation speeds of the winding drums 11a, 11b, 12a, 12b so that the wire rope 8 can be wound in an aligned state. , A cylindrical camshaft 31 is provided between the guide rails 26 and rotatably supported by the side frame 16 via bearings, and is formed on the outer periphery of the camshaft 31 by two spirals in opposite directions. Cam groove 31
a is formed, and a cam follower 32 rotatable around a vertical axis guided along the cam groove 31a is mounted on the guide cart 28a. The sprocket 33 is mounted on the outer side of the side frame 16 of the camshaft 31, and the rotational force of the sprocket 34 mounted on the outer side of the side frame 16 of the rotary shaft 13 is transmitted to the sprocket 33 via the intermediate sprockets 35 and 35 a. And take-up drum 11
The guide carts 28, 28a are reciprocated by the winding pitch in synchronization with the rotations of a, 11b, 12a, 12b.

Therefore, the four winding drums 11a, 1
When 1b, 12a, and 12b are driven to rotate in opposite directions, the cam shaft 31 is rotated in synchronization with the rotation speed, and the two wire ropes 8a and 8b wound around the front winding drums 11a and 12a. Is wound around the sheave 30 and two wire ropes 8c, 8d wound around the rear winding drums 11b, 12b are wound around the sheave 30a, respectively.
Sheave 3 according to the winding pitch of 2a, 11b, 12b
When the 0, 30a is moved and wound or unwound in the aligned state, and wound up to the end of the drum, the sheaves 30, 30a are moved in the opposite direction by the cam groove 31a, and the multilayer in the aligned state is moved. Is performed.

In this way, the 4 connected to the working cage 9
Four wire ropes 8a to 8d
The work cage 9 is moved up and down by winding and rewinding the work cage 9 with a, 11b, 12a, and 12b. When the work cage 9 lands with the wire rope 8 wound on the winding drums 11, 12, a wire is wound. Since the load such as the weight of the working cage 9 does not act on the rope 8, the wire rope 8 wound on the winding drums 11 and 12 becomes loose, and the winding amount changes at the next winding, so that the working cage 9 becomes unusable. There is a gripping mechanism 40 that detects the landing of the work cage 9 with a limit switch or the like and grips the wire rope 8 because of the possibility of tilting.

As shown in FIGS. 1 to 3, 6 and 8, the gripping mechanism 40 is disposed outside the side frame 15 which is the entrance side of the wire rope 8 to the main body frame 18. 4 for vertically sandwiching the wire ropes 8a to 8d
Upper and lower gripping plates 41 and 42 having two semicircular grooves,
The upper and lower gripping plates 41 and 42 are slidably attached to a support shaft 43 that penetrates the four corners up and down.
A compression coil spring 44 is interposed between the outer end of the wire 3 and the outer sides of the upper and lower gripping plates 41 and 42, and biases the four wire ropes 8a to 8d between the upper and lower gripping plates 41 and 42 so as to vertically sandwich the wire ropes 8a to 8d. It is.

The fixed links 4 are provided above and below the center of the upper and lower gripping plates 41 and 42 at right angles to the insertion direction of the wire rope 8.
The fixed links 45 are connected to one end of each of the fixed links 45, and one end of each of the small links 46 is connected to the other end thereof. The intermediate portions of the drive links 47 are pivotally attached to the side frame 15 by pins 48 so as to serve as fulcrums. On the other hand, holding plates 49 are attached to both sides of the lower end of each drive link 47, and the holding plates 49 A feed nut 50 having a right-hand thread and a left-hand thread formed therebetween is mounted so as to be able to swing with pins 51 from both sides.

A square screw shaft 52 having a right-hand screw and a left-hand screw formed at both ends is screwed into a feed nut 50 at the lower end of these two drive links 47 so as to be rotatable around a central axis. A flexible shaft 53 is connected to an end of the square screw shaft 52 via a coupling, and is connected to a motor 54.

Therefore, the four wire ropes 8a to 8d are inserted between the semicircular grooves of the upper and lower gripping plates 41 and 42, and the motor 54 rotates the square screw shaft 52 in the normal operation state. With the upper ends of the drive links 47 on both sides approaching each other, the two small links 46 are close to a straight line so that the interval between the upper and lower grip plates 41 and 42 is reduced.
4 so that the open wire ropes 8a to 8d pass smoothly.

On the other hand, when the work cage 9 lands and is detected, the motor 54 is driven by the detection signal, and the feed nut 50 at the lower end of the drive link 47 is moved so as to approach each other. The two small links 46 are formed in a C-shape so that the upper ends of the drive links 47 are separated from each other, and the four wire ropes 8a are formed by the upper and lower gripping plates 41 and 42.
Wire ropes 8a to 8d
From the winding drums 11 and 12 is prevented.

Although the gripping mechanism 40 has been described as being driven by a motor using a feed screw shaft, the present invention is not limited to this. The driving is performed using an actuator such as an air cylinder, a hydraulic cylinder, or a solenoid. The link may be gripped by reciprocating drive.

Next, take-up drums 11a, 11b, 12a, 12 which are safety devices of the lifting device 10 for the working cage.
The brake mechanism 60b will be described with reference to FIGS. 2, 4, 9, and 10. FIG.

The brake mechanism 60 is provided on the winding drum 11
a, 11b, 12a and 12b are detected, and the brakes are mechanically actuated by detecting over-rotation.
a, 11b and the winding drums 12a, 12b
Since the gears are engaged with each other at 0 and 20a, they are arranged on one of the winding drums 12a and 12b so that the four winding drums 11a, 11b, 12a and 12b are stopped.

In the brake mechanism 60, the winding drum 1
A ratchet wheel 61 is fixed to the side plate 12d of 2b, and is configured to rotate integrally with the rotating shaft 14 and the winding drums 12a and 12b, and a main frame 18 in which a ratchet pawl 62 meshing with the ratchet wheel 61 is a fixed side. Is attached to the side frame 16 so as to be swingable, and a tension spring 63 is attached so as to urge the ratchet wheel 61 to hold the state in either a brake state in which it meshes with the ratchet wheel 61 or a released state in which it does not mesh. The position has been set.

A roller 64 is attached to the base end of the ratchet pawl 62 so as to protrude outward.
By pushing up, the ratchet pawl 62 is swung so that the ratchet pawl 62 meshes with the ratchet wheel 61 to be brought into the brake state.

Therefore, in order to detect over-rotation of the winding drums 12a and 12b, a rotating plate 66 is rotatably mounted on the rotating shaft 14 via a bearing 65, and a sprocket 67 mounted on an end of the rotating shaft 14 is used. The rotation plate 66 is rotated at a high speed by increasing the speed to a sprocket 69 integrated with the rotation plate 66 via the speed increasing device 68 and transmitting the rotational force.

The rotating plate 66 is provided with two protrusions projecting in the direction of the rotation axis at two locations on the outer periphery and the center side on the diameter passing through the center of rotation, and has a rod 7 having a large diameter head 70a.
Reference numeral 0 penetrates from the outer peripheral side and is slidably mounted in the radial direction, and is attached with a double nut 71 at a distance from the central projection. And the rod 7 between the outer and inner protrusions
The weight 72 is slidably mounted on the middle portion of the zero, and a compression coil spring 73 is interposed between the weight 72 and the outer protrusion to press the weight 72 toward the center. I have.

Therefore, when the rotating shaft 14 is rotated,
The speed of the rotation is increased by the speed increasing device 68 and transmitted to the rotating plate 66 for high-speed rotation, and the centrifugal force applied to the weight 72 compresses the compression coil spring 73 so that the head 70 a of the rod 70 is moved outward by that amount. It will be in the state protruding.

Therefore, by adjusting the spring force of the compression coil spring 73 and the centrifugal force generated by the weight 72, the head 70a of the rod 70 is moved outward when the rotation speed of the rotary shaft 14 is in a predetermined over-rotation state. The roller 64 of the ratchet pawl 62 is pushed up to engage the ratchet pawl 62 with the ratchet wheel 61 to stop the winding drums 12a and 12b. Can hold the locked state.

By stopping the winding drums 12a and 12b, the rotation of the winding drums 11a and 11b engaged with the ring gears 20 and 20a is also stopped.

After the ratchet pawl 62 is engaged with the ratchet wheel 61 and the brake mechanism 60 is operated, the driver confirms and releases the brake. In addition, the winding drum 11a, 1 for winding and rewinding the wire rope 8 with the brake mechanism 60 is used.
The wire rope 8 can be held down by operating each time the rotation of the rotation of 1b, 12a, 12b is stopped. However, when fine adjustment of the elevating position of the working cage is performed, the timing of actuation / release of the brake mechanism 60 is determined. In some cases, the operation cannot be performed smoothly due to a shift in the rotation timing of the take-up drum. In this case, only when the take-up drum is excessively rotated, this is detected and the brake mechanism is operated.

In the lifting device 10 for a working cage constructed as described above, for example, as shown in FIG.
One end of each of the wire ropes 8a to 8d is attached to a corner, and the other end is passed between the upper and lower grippers 41, 42 of the gripping mechanism 40, and the four winding drums 11a are passed through the two sheaves 30, 30a of the guide mechanism 25. , 11b, 12a, 12b
The two wire ropes 8a and 8d at diagonal positions out of the four are wound around the winding drum 11 of one of the rotating shafts 13.
a, 11b, the remaining two diagonal wire ropes 8
b, 8c to the winding drum 12a of the other rotary shaft 14,
The working cage 9 can be safely suspended even if the wire ropes 8a to 8d are broken.

The winding drums 11a, 11b, 12
When the wire ropes 8a to 8d are wound around the wires a and 12b, the wire rope 8a is wound on the winding drum 11b via the sheave 30a, and the wire rope 8d is 30 to the winding drum 11a and the wire rope 8b to the sheave 30.
The wire rope 8c is wound around the winding drum 12a via the sheave 30 and the winding drum 12b via the a.

In this way, the four wire ropes 8a to 8d are connected between the work cage elevating device 10 and the work cage 9 to control the elevating motor 22 to take up the wire ropes 8a to 8d. Then, the work cage 9 is raised, and the work cage 9 is lowered by being rewound, and stopped at a predetermined position to perform work on the outer wall surface.

The winding and rewinding of the wire ropes 8a to 8d is performed while being guided by the guide mechanism 25, and the wire ropes 8a to 8d are layered in three layers in an aligned state and are wound or unwound.

When the work cage 9 lands on the ground, when the landing is detected by a limit switch or the like attached to the bottom of the work cage 9, the winding drums 8a to 8d are provided.
Is stopped, and at the same time, the motor 54 of the gripping mechanism 40 is driven to drive the flexible shaft 5.
3, the lower ends of the two drive links 47 are drawn, and the small link 46 is formed in a C-shape to form the upper and lower gripping plates 41 and 4.
2, the wire ropes 8a to 8d are gripped, and the winding drum 1
Looseness from 1a, 11b, 12a, 12b is prevented.

Further, in the event that the working cage 9 suddenly falls, the rotating plates 66 of the winding drums 12a and 12b may be used.
Is excessively rotated, and the head 70a of the rod 70 of the rotating plate 66
Protrudes outward by centrifugal force against the compression coil spring 73, kicks the roller 64 of the ratchet pawl 62, and engages with the ratchet wheel 61 in the over-rotation state to stop.

As described above, according to the working cage elevating device 10, the winding drums 11a11b, 12a, and the winding drums 11a11b, 12a, even in the case of four suspensions using the four wire ropes 8a to 8d.
12b, the wire ropes 8a to 8d are wound up by a multi-layer lap winding.
As compared with the case where b, 12a, and 12b are wound into one layer, the size can be reduced and the weight can be reduced.

Further, since the wire ropes 8a to 8d are wound up or unwound in an aligned state by providing the guide mechanism 25, the length of the wire ropes 8a to 8d is hardly changed, and the wire ropes 8a to 8d are raised and lowered without causing the working cage 9 to be inclined. be able to.

Further, the four winding drums 11a, 11
b, 12a, 12b and two sheaves 3 of the guide mechanism 25
Since 0 and 30a are driven by one elevating motor 22, the apparatus can be made compact and lightweight.

In this embodiment, the case where the present invention is applied to a four-hanging work cage has been described.
The present invention can also be applied to a hanging work cage.

Further, the number of layers of lap winding on the winding drum is also 3
The number of stages is not limited to four, but may be four or more or two.

[0058]

As described above in detail with one embodiment, according to the working cage elevating device according to the first aspect of the present invention, the number of wire ropes suspended from the working cage depends on the number of wire ropes. The drums are provided, and the wire ropes are reciprocated on these drums by the guide of the guide mechanism so as to be wrapped orderly and multilayered, so that the drums can be made compact and lightweight. It is possible to reduce the size and weight of the entire device.

According to the working cage elevating device of the second aspect of the present invention, the guide mechanism includes a guide sheave for the camshaft having the grooved cam and a guide reciprocated by the grooved cam of the camshaft. Because it was provided integrally,
While rotating the drum in one direction, the wire rope can be reciprocated neatly in synchronism with the rotation and wound up in multiple layers.

Further, according to the lifting device for a working cage according to the third aspect of the present invention, when four working cages are hung, four drums are arranged on two parallel axes. Since the rotation transmission mechanism is provided between the two, the change in the winding length can be suppressed as much as possible by driving the four units in synchronization with one drive unit.

According to the lifting device for a working cage according to the fourth aspect of the present invention, since a gripping mechanism for gripping a plurality of wire ropes is provided upstream of the guide mechanism, even when the working cage lands. It is possible to prevent the wire rope wound around the drum from being loosened, maintain the aligned state, and prevent the work cage from tilting when it is raised.

Further, according to the lifting device for a working cage according to the fifth aspect of the present invention, the rotation of the drum is accelerated to detect an excessive rotation by centrifugal force, and thereby the ratchet wheel having the ratchet pawl attached to the drum. Since the brake mechanism is provided for locking the work cage, a sudden descent in the event of an emergency can be mechanically stopped to safely stop the work cage.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a working cage elevating device according to the present invention.

FIG. 2 is a side sectional view according to an embodiment of the working cage elevating device of the present invention.

FIG. 3 is a plan view showing a part of the working cage elevating device according to an embodiment of the present invention, with parts omitted;

FIG. 4 is a plan view of a winding drum portion according to an embodiment of the working cage elevating device of the present invention.

FIG. 5 is a schematic right side view according to an embodiment of the working cage elevating device of the present invention.

FIG. 6 is a schematic left side view according to an embodiment of the working cage elevating device of the present invention.

FIG. 7 is a schematic cross-sectional view of a guide mechanism portion according to an embodiment of the working cage elevating device of the present invention.

FIG. 8 is a schematic front view of a gripping mechanism portion according to an embodiment of the working cage elevating device of the present invention.

FIG. 9 is a schematic longitudinal sectional view of a brake mechanism according to an embodiment of the working cage elevating device of the present invention.

FIG. 10 is a schematic front view of a brake mechanism according to an embodiment of the working cage elevating device of the present invention.

FIG. 11 is a schematic explanatory view of a working cage to which the working cage elevating device of the present invention is applied.

FIG. 12 is an external perspective view schematically illustrating a conventional lifting device for a working cage.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rooftop 4 Traveling trolley 5 Telescopic arm 6 Revolving arm 7 Elevating device 8 Wire rope 9 Work cage 10 Working cage elevating device 11a, 11b Winding drum 12a, 12b Winding drum 13, 14 Rotating shaft 18 Body frame 20, 20a Ring gear Reference Signs List 21 worm reducer 22 motor (for elevating and lowering) 25 guide mechanism 30, 30a sheave 31 cam shaft 31a cam groove 32 cam follower 40 gripping mechanism 41, 42 vertical gripping plate 45 fixed link 46 small link 47 drive link 52 square screw shaft 54 motor 60 Brake mechanism 61 Ratchet wheel 62 Ratchet pawl 68 Gearbox 70 Rod 72 Weight 73 Compression coil spring

Claims (5)

[Claims] 1. A plurality of rotatably driven drums around which a plurality of wire ropes, one end of which is connected to a working cage and the other end of which is wound or unwound, are provided. And a guide mechanism for reciprocating and guiding each of the wire ropes in the axial direction of the drum. 2. A cam shaft provided with a groove cam which is arranged in parallel with the axial direction of the drum and which is rotated by transmitting a rotational force of the drum, the guide mechanism being arranged along a groove cam of the cam shaft. The lifting device for a working cage according to claim 1, wherein the lifting device comprises a guide that reciprocates and a guide sheave that is moved integrally with the guide. 3. The method according to claim 1, wherein the wire ropes are four, and two drum shafts having two drums on one shaft are arranged in parallel, and a rotation transmission mechanism is provided between these parallel drums. The lifting device for a working cage according to claim 1, wherein the driving devices are driven synchronously by one driving device. 4. A gripping mechanism provided on an upstream side of the guide mechanism with respect to the drum, wherein a gripping mechanism is provided for preventing a wire rope from being loosened and gripping when a work cage lands. The lifting device for a work cage according to any one of the claims. 5. A brake mechanism for preventing a sudden fall of a work cage due to over-rotation is provided on the drum, and the brake mechanism transmits a ratchet wheel provided on the drum and a rotational force of the drum via a gearbox. It is characterized by comprising a detection mechanism for detecting over-rotation by an increase in centrifugal force, and a ratchet claw provided on a fixed side to be locked to the ratchet wheel by an increase in centrifugal force of the detection mechanism. Item 5. The lifting device for a work cage according to any one of Items 1 to 4.