JP3357917B2 - Switching mechanism for the number of wire ropes in jib cranes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jib crane used mainly for construction work and a mechanism for switching the number of wire ropes required for a jib crane, which is carried out in accordance with the weight of a load. About.

[0002]

2. Description of the Related Art Conventionally, a predetermined number (for example, two) of wire ropes are attached to a jib crane installed at a construction site and used for lifting and lowering materials and the like. Is used to lift and lower the heavy goods. In a mobile crane such as a crawler crane, two types of wire ropes, two and one, are pre-arranged and selectively used depending on the load of the suspended load.

[0003]

In a construction site, a single crane is used to handle a variety of loads, so if the weight of the load becomes heavy, the above-mentioned preparatory work is required. Lifting work is difficult and dangerous when hanging with the set number of wire ropes. It is troublesome to prepare another crane having a large number of wire ropes and a large lifting capacity at the work site, and it is extremely dangerous to forcibly lift a heavy lifting object. Therefore, usually, the boom is lowered and the wire rope is changed from the two-hook state to the four-hook state to increase the number of wire ropes to cope with an increase in the hanging load. However, performing such a wire rope changing operation requires a lot of trouble and impairs the workability. In one example, the operation of changing the wire rope may require more than half a day. In particular, there is a case where it is necessary to perform the switching operation several times a week for the convenience of the operation, and the time loss due to the switching operation is large.

[0004] In the case of a mobile crane or the like having the above-described two types of wire hanging suspension structure,
For example, it is necessary to store the work once suspended and temporarily switch to the double suspension operation again. Appropriate. In the present invention, such a problem is solved, and the number of wire ropes required for hoisting can be extremely easily changed according to the weight of the lifted material, that is, automatically switched, so that even a heavy weighted load is impossible. It is an object of the present invention to provide a switching mechanism of the number of wire ropes of a jib crane that can safely lift without any trouble and improve the lifting work efficiency.

[0005]

As a means for solving the above-mentioned problems, a switching mechanism for the number of wire ropes of a jib crane according to the present invention comprises a jib crane boom 6 having a top end supported by a support shaft 5 at an end thereof. Hanging body 1
And a hook block 2 with a hanging hook 23 attached to the lower part.
And a connecting body 3 which can be freely connected to either the hook block 2 or the hanging body 1. The hanging body 1 has a box body 11 having a guide portion 12 which is opened downward. And a locking means 15 having a pair of locking claw pieces 16 and 16 is provided on the upper part of the guide member 12. The hook block 2 has at least two top pulleys attached to the end of the boom. A plurality of pulleys 22 are wound around each of a plurality of wire ropes 8 hanging from 7, and a connecting portion 25 for connecting the connecting body 3 is provided. A rope winding reel 33 for fixing an end of the wire rope 8 wound around the pulley 22 is installed, and a lower portion 31 of the rope winding reel 33 is connected to the hook block 2.
Having a protrusion 35a which can be inserted into the guide portion 12 of the hanging body 1 and locked to the locking claw pieces 16, 16 of the locking means 15 by being connected to the connecting portion 25. A head 35 is mounted on the upper end of the connecting body 3 and an unlocking roller 37b is provided below the locking head 35 so as to release the locking state of the protruding piece 35a locked on the locking claw pieces 16,16. Means 37, and the hanging body 1 of the connecting body 3
The number of wire ropes is switched by locking or detaching from the wire rope.

The locking means 15 of the hanging body 1 has a pair of locking claw pieces 16 and 16 arranged symmetrically with respect to the center line, and has a base end rotatably supported by a pin 18. The upper portions of the locking claw pieces 16, 16 are formed in upward claw portions 16 ', 16', and a substantially middle position inside thereof is formed in a concave portion 16 ".
In addition, the rear surfaces of the locking claw pieces 16 are urged inward by a spring 17, while the locking head 35 of the connecting body 3 is provided with a claw portion 16 ′ of the locking means 15.
A protrusion 35a having a concave portion 35b on the lower surface of the guide plate 32b attached to the upper portion of the connecting body 36 is provided to project from the guide plate 32b.
Rollers 37b, 37b are installed on both left and right sides of a pair of slide pieces 37a, 37a sandwiching
b, so that the rollers 37b, 37b can be engaged with the concave portions 16 'of the locking claw pieces 16, 16.

The hook block 2 is entirely covered by a hook block main body 21 and has a pocket-like connection having a guide 25 "formed at the substantially central position in the hook block main body 21 with an upper end edge opened upward. A connecting pin hole 25 ′ is formed at a position of the hook block body 21 corresponding to a substantially central position in the connecting portion 25, while a lower portion 31 of the connecting body 3 is connected to the hook block 2. Part 2
5 and the connecting pin hole 2
A connecting hole 31 ′ may be formed at a position corresponding to 5 ′, and the pin 3 may be inserted through the connecting hole 31 ′ and the connecting pin hole 25 ′ to restrict the connecting body 3 to the hook block 2. .

Further, at least two rope winding reels 33a for fixing the ends of the wire ropes 8 wound around the hook blocks 2 are rotatably mounted on the connecting body 3, and each of the rope winding reels 33a is rotatable. Gear 3 on the side of reel 33a
4 and an idle gear 34 'which meshes with each of the gears 34 and rotates synchronously in the same direction.

In the box 11 of the hanging body 1,
A plurality of limit switches 60, 61, which detect the position by the contact of the locking head 35 sequentially with the rise of the connecting body 3,
62 were placed at different desired heights. A guide sleeve 45 is bored on the box body 11 of the hanging body 1 on the center line, and a locking ring 38 matching the guide sleeve 45 of the box body 11 is provided on the locking head 35 of the connecting body 3. ,on the other hand,
The guide sleeve 45 is connected to one side of the hanging body 1 through a bell crank 44 connected to a linear actuator 41.
Auxiliary locking means 4 having locking pins 43 for moving forward and backward inside
0, and the locking pin 43 is operated by the operation of the linear actuator 41.
Are inserted through the guide sleeve 45 and the locking ring 38 to lock the locked state.
May be operated by a control signal for confirming that the locking head 35 of the connecting body 3 is locked to the locking means 15 of the hanging body 1 or that the locking is released.

[0010]

[0011]

The hanging member 1 is provided with a locking means 15 following the guiding and guiding portion 12.
5 is provided with a locking head 35 which can be locked,
When the wire rope 8 is pulled and raised in a two-hook state (FIG. 8) in which the connecting body 3 is connected to the hook block 2, the locking head 35 arrives at the hanging body 1 located immediately above and is guided. Claw portions 16 'of the locking means 15 through the portion 12,
16 'is pushed open (FIGS. 9A and 9B). When the connecting body 3 is further pulled up, the locking head 35 is moved to the locking claw 1 of the locking means 15.
It passes through 6, 6 and protrudes upward (FIG. 9C). At the same time, the locking claw pieces 16 and 16 are respectively
The pawls 16 ', 16' are pressed by the urging forces of 7, 17 and come into contact with the guide plate 32b. Then, wire rope 8,8
And the hook block 2 is lowered.
Is lowered by its own weight, and the concave portions 35b, 35b at the lower end of the locking head 35 are claw portions 16 ', 1 of the locking claw pieces 16, 16.
6A, the hook block 2 moves down integrally with the hanging body 1 (FIG. 9D). Therefore, the four wire ropes 8 hanging from the boom tip are in a suspended state (FIG. 2), and a heavy lifting object can be safely lifted with a small force.

In order to return the above-mentioned four-hanging state to the two-hanging state, the hook block 2 is raised again, and the lower portion 31 of the connecting body 3 located immediately above is stored in the connecting portion 25 (connected). ) Raise it further. Then, the locking head 35 is lifted away from the claw portion 16 '. Subsequently, the rollers 37b, 37b of the unlocking means 37 are
6 and 16 are pushed upward while being opened outward, and the recess 16 ″ is formed.
And the self-holding state with the locking claw pieces 16, 16 opened is maintained (FIG. 10A). When the hook block 2 is lowered in this self-holding state, the connecting body 3 is also lowered by its own weight, and the lower end of the locking head 35 engages with the concave portion 16 ″ of the locking claw piece 16 so as to stick together. 10 comes into contact with the roller 37b of the unlocking means 37 (see FIG. 10).
B). When it is further lowered, the locking head 35 pushes the unlocking means 37 downward while passing between the locking claw pieces 16 opened by the unlocking means 37 (FIG. 1).
0C), the engagement state is cut off (FIG. 10D). By lowering the connected body 3 disengaged in this manner while being connected to the hook block 2, a two-hanging state is obtained (FIG. 1), and a relatively light lifting work can be quickly performed. it can.

[0013]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows an overall view of a mechanism for switching the number of wire ropes. 2 and 3 show the internal structure. The mechanism is configured to be able to automatically switch between a two-hook state and a four-hook state according to the weight of the load while substantially using two wire ropes. The basic structure of the boom 6 of the jib crane is such that a hanging body 1 whose upper end is suspended by a support shaft 5 and a hanging hook 23 is attached to a lower part of the boom 6 and two pulleys 22 are mounted on the left and right sides. And a connecting member 3 that can be freely connected to only one of the hook block 2 and the hanging member 1.
It is composed of

The two wire ropes 8, 8 unwound from a hoist mounted on a swivel of a crane body (not shown) are S-twisted on one side and Z-twisted on the other. It is hung around the top pulleys 7, 7 and then drooped,
The hook block 2 is folded upward through the two pulleys 22 and 22 and wound around the connecting body 3 (FIG. 2), and is wound or fed out in synchronization with the drive of the hoisting machine. Thus, the hook block 2 is vertically raised or lowered.

The detailed structure of the hanging body 1 is shown in FIGS. In the hanging body 1, two plates 11a, 11a of the same shape and the same size are arranged back and forth with an interval allowing the tip of the connecting body 3 to be inserted therethrough (see FIG. 5). , 11a are formed in a box body 11 by surrounding the outer periphery with a plate material. The upper end thereof is provided with a mounting hole 13 through which the support shaft 5 at the tip of the boom 6 is inserted. The hanging body 1 is vertically suspended by the support shaft 5 at the tip of the boom 6. (Fig. 1). A guide portion 12 for receiving a locking head 35 described later of the connecting body 3 is provided at a lower portion in the box body 11. The guidance unit 12
A guide introduction port 12a formed in a tapered shape with an upward slope on the suspension center line of the box body 11 is provided at the lowermost portion, and a portion following the guide introduction port 12a has a cylindrical shape having a rectangular cross section. It is formed on the throat 12b. It is to be noted that a plurality of limit switches 60, 61, and 62 are provided at different heights in the box body 11 of the hanging body 1 as means for detecting the position of the locking head 35 of the connecting body 3 ascending. Good (Fig. 5). This is because the locking head 35 of the linked body 3 to be raised is brought into contact with each of the limit switches 60, 61, and 62 in order to detect each raised position, confirm the locked state of the linked body 3, and perform remote control. This is to ensure the wiring.

At the position just above the guide portion 12 of the hanging body 1, a locking means 15 for the locking head 35 of the connecting body 3 is provided.
Is provided. A pair of locking claw pieces 16, 16 constituting the locking means 15 are attached to the throat 12
It is provided at an outer peripheral position just above b and at a symmetrical position across the center line of the box 11. The upper portions of the locking claw pieces 16 are upwardly movable claw portions 16 ', 16' which can be freely moved at all times.
The lower portion is rotatably supported by brackets 11 a provided in the box body 11 with pins 18. A concave arc-shaped concave portion 16 ″ is formed at a substantially intermediate position between the inner edges of the locking claw pieces 16, 16.
Each locking claw 16 is provided on each back surface of the locking claw 16.
Springs 17, 17 are provided to urge the plates 6, 16 in an inwardly closing direction. The outer end of the spring 17 is connected to and fixed to the vicinity of the pin 19 'of a flap 19 which is supported by a pin 19' at the upper end of the body of the box body 11 and which can be opened and closed outward. ing.

The hook block 2 is a box-shaped hook block main body 2 in which two plates 21a, 21a are assembled at regular intervals, as shown below each of FIGS.
1, two suspension pulleys 22 and 2 are provided at symmetrical positions with a space of approximately one pulley at a center position when viewed from the front.
2 are installed. At the center of the lower end of the hook block main body 21, a hanging hook 23 for a lifting object is attached. Between the two suspension pulleys 22 (substantially at the center of the hook block body 21), a concave arc-shaped (pocket-shaped) connecting portion 25 for receiving a lower end portion of the connecting body 3 described below from above is provided. ing. The upper end edge of the connecting portion 25 is formed as a guide 25 ″ that is inclined upward so as to guide the hanging connected body 3 and facilitate storage. A connecting pin hole 25 ′ is provided at a substantially central position in the connecting portion 25. The connecting pin 24 is inserted into or pulled out of the connecting pin hole 25 'to integrate or separate the connecting body 3 and the hook block 2 housed in the connecting portion 25. (FIG. 8
reference).

As shown in FIGS. 6A and 6B, the structure of the connecting body 3 includes a connecting body 36, a rope winding reel 33 provided on the connecting body 36, and an upper part of the connecting body 36. The provided unlocking means 37 and the connecting body 3
6 comprises a locking head 35 provided at the tip end thereof via a guide plate 32b projecting vertically upward from the upper end. The lower part 31 of the connecting body 3 is
1 is formed in an arc shape having an outer dimension that can easily fit into the connecting portion 25 (see FIG. 8), and the central portion 32 is an elongated slender shape having an outer dimension that can be inserted into the throat 12b of the hanging body 1. It is formed on the rod position restricting portion 32a (see FIG. 10A), and its tip is tapered so that it can be easily inserted into the throat 12b. As described above, a connection hole 31 "for connecting to the hook block main body 21 by the connection pin 24 is provided at a substantially central position of the arc-shaped lower portion 31. The connection hole 31" is provided.
A rope winding reel 33 for fixing the terminal of the wire rope 8 is rotatably supported by a shaft 33 'at an upper position of the wire rope 8. Therefore, as shown in FIG. 2, the ends of the two wire ropes 8, 8 are respectively turned on the rope winding reel 33 after the pulleys 22, 22 of the hook block 2 are turned back as follows. Wrap around. That is, when one wire rope 8 is wound from the right direction, the other wire rope 8 is wound from the left direction, but is wound a plurality of times by the same length, and each wire rope tip is wound on the rope winding reel 3.
3 is fixed.

The fixing of the tip of the wire rope may be performed with the structure shown in FIG. That is, the two rope winding reels 33a, 33a are rotatably supported by the shafts 33b, 33b as terminal fixing portions of the wire rope 8 in a symmetric arrangement at a substantially central position of the connecting body 36, and these rope windings are supported. Gears 34, 34 are attached to the side surfaces of the attachment reels 33a, 33a, and the gears 34, 34 are meshed with an idle gear 34 'provided at a lower portion, and are synchronously rotated in the same direction. Therefore, the ends of the wire ropes 8, 8 wrapped around the pulleys 22, 22 of the hook block 2 are connected to the rope winding reel 33.
a and 33a, and are fixed to the rope winding reels 33a and 33a, respectively. Therefore, even if the displacement of the plurality of wire ropes 8 hanging from the pulleys 3 at the tip of the boom 6 is displaced, the displacement is automatically controlled by the synchronous rotation of the two rope winding reels 33a. The wiring operation can be performed stably without tilting the connecting body 3.

As shown in FIG. 6A, a guide plate member 32b is provided on the center line of the position restricting portion 32a. The locking means 1 of the hanging body 1
5 (see FIG. 2) is provided with a locking head 35. The locking head 35 is connected to the guide plate 32b via a locking ring 38 provided at the forefront of the guide plate 32b.
Projecting pieces 35a are provided on both sides of the front end of the projecting part.
5b. Therefore, as shown in FIG.
Locking head 35 inserted into locking means 15 of hanging body 1
Claw portions 16 ', 1 of the locking means 15 in the concave portions 35b, 35b
When 6 'is engaged, it is fixed in the downward direction. An unlocking means 37 is provided on the guide plate 32 below the locking head 35 and at the upper end of the position restricting portion 32a. The unlocking means 37 is a pair of front and rear slide pieces 3 slidably provided on the guide plate 32b.
7a, 37a (FIG. 6B) and the slide pieces 37a, 3a.
Rollers 37b, 37b supported on 7a and disposed on both left and right sides of the guide plate 32b. When the unlocking means 37 is pushed up and enters between the locking claw pieces 16, 16 of the locking means 15, the locking claw pieces 16, 16
Can be pushed outward by opening against the urging force of the spring 17 (see FIG. 10A).

An auxiliary locking means 40 is provided on one side surface of the hanging body 1 shown in FIG. The auxiliary locking means 40 includes a linear actuator 41 such as an electric cylinder wired so that power can be supplied from the jib side of the crane.
And the hanging body 1 operated by the linear working machine 41
And a locking pin 43 for locking the locking head 35 portion of the inner connector 3 as a main element. The locking pin 43 is attached to the box 1
In FIG. 1, it is supported so as to be able to be inserted into a guide sleeve 45 mounted orthogonally on the suspension center line, and is connected to an operating rod 42 of the linear working machine 41 via a bell crank 44. In a state where the locking head 35 of the connecting body 3 is locked by the locking means 15 of the hanging body 1, the locking pin 43 is inserted into the locking ring 38 of the connecting body 3 to lock the connection state. Can be. The auxiliary locking means 40 is connected to the connecting body 3
Is controlled electrically by a control signal of a switch for confirming that the locking head 35 is locked by the locking means 15 of the hanging body 1. In order to release the lock of the connecting body 3 by the locking pin 43, the linear actuator 41 is also operated in reverse by the control signal. In addition, on the opposite side of the box body 11 of the hanging body 1,
Keeping the equilibrium state with respect to the auxiliary locking means 40,
A balance weight 48 may be attached so as not to hinder the attachment and detachment (see FIG. 11). Reference numeral 46 in FIG. 5 is a bracket for attaching the linear actuator 41 to the box 11, reference numeral 46 'is a support bracket for the bell crank 44, and reference numeral 47 is a cover for the auxiliary locking means 40.

Next, the operation of the mechanism for switching the number of wire ropes configured as described above will be described mainly with reference to FIGS. 9 and 10. FIG. At the time of normal lifting work, the wire ropes 8, 8 are in a state of being suspended by two wires, and at this time, the lower half 31 of the connecting body 3 is connected to the connecting portion 25 of the hook block 2 as shown in FIG. Connected pin 2
4 are connected.

FIGS. 9A to 9D show how to switch the wire rope 8 from the two-row state to the four-row state. First, the connecting member 3 is inserted through the connecting pin hole 25 'of the hook block 2.
The connecting pin 24 inserted into the connecting hole 31 "is removed (see FIG. 8). Thereafter, the wire ropes 8, 8 are wound up by the hoist and the connecting body 3 together with the hook block 2 is wound.
Is pulled up, and the locking head 35 of the connecting body 3 enters the hanging body 1 through the guide member 12 (FIG. 9A). Then, the locking head 35 of the connecting body 3 is moved to the claw portion 1 of the locking means 15.
6 'and 16' are pushed open to ascend (FIG. 9B). At this time, since the flaps 19, 19 are pushed outward from the pin 19 'as a starting point, the operator can determine whether the locking head 35 has passed the position of the locking means 15 in the hanging body 1. Can be checked together with the operation of the limit switches 60..., And safety is assured.

When the hook block 2 is further pulled up and the connecting body 3 is pushed up, as shown in FIG. 9C, the locking head 35 of the connecting body 3 moves the position of the locking claw pieces 16 and 16 of the locking means 15. It passes and protrudes upward. Then, the locking claw pieces 16, 16 are pushed by the springs 17, 17 on the back, respectively, and the claw portions 16 ′, 1 are inserted into the guide plate 32 b of the connecting body 3.
6 'is abutted. Thereafter, when the wire ropes 8, 8 are fed out and the hook block 2 is lowered, the connecting body 3 is lowered by its own weight, and the concave portion 3 at the lower end of the locking head 35 is formed.
5b, 35b are the claw portions 16 ', 1 of the locking claw pieces 16, 16
6 ′, and are locked, and the connecting body 3
Is firmly connected while maintaining the locked state (FIG. 9D), and thus the wire rope 8 hanging from the boom tip is
Substantially, four lines are suspended (see FIG. 2).

The locking state in which the connecting body 3 is connected to the hanging body 1 is engaged with the locking ring 38 of the locking head 35 by the operation of the auxiliary locking means 40 as shown in FIG. Stop pin 4
3 is inserted and supported by the box body 11 via the guide sleeve 45, so that safety is improved. Therefore, this 4
There is no danger that the wire rope 8 will come off even if a large lifting load is applied during the work in the final hanging state. Further, even if the length of the wire rope 8 changes due to the winding or rewinding operation during the raising / lowering operation, the end of each wire rope 8 is wound around the rope winding reel 33 from the left and right in the connector 3. When one of the wire ropes 8 is pulled out, the other wire rope 8 is wound and the length is automatically adjusted in the rope winding reel 33, and the connecting body 3 is inclined. The lifting work of heavy lifting materials can be performed easily and safely without fear.

Next, the procedure for returning from the above-described four-row suspension state to the two-row suspension state will be described with reference to FIGS. First, the lock by the locking pin 43 of the auxiliary locking means 40 is released. Thereafter, when the hook block 2 is pulled up, the connecting portion 25 of the hook block 2 reaches and receives the lower portion 31 of the connecting body 3 (see FIG. 8), and the connecting body 3 is pushed up as it is. When the upper limit of the lifting of the hook block 2 is detected by the operation signal of the limit switch previously arranged at the maximum lifting position, the lifting of the hook block 2 is automatically stopped. At this time,
The coupling body 3 is also pushed up to the upper limit, and the locking head 35 at the distal end of the coupling body penetrates above the claw portion 16 ′ of the locking claw piece 16, and instead, the rollers 37 b and 37 of the unlocking means 37.
b is brought into contact with the locking claw pieces 16, 16, and each locking claw piece 16,
16 open outward and as shown in FIG. 10A,
Rollers 37b, 37b are recessed portions 1 of locking claw pieces 16, 16
6 ", and the engagement pawls 16, 16 are kept open. In this self-holding state, both pawls 1 are engaged.
The space between the inner surfaces of the connecting members 6 and 16 is wider than the width of the locking head 35 of the connecting body 3. Also at this time, flaps 19, 19
Is open outward, the worker can visually recognize that the locking of the locking head 35 by the locking means 15 has been released.

Next, when the hook block 2 is lowered in the self-holding state in which the locking claw pieces 16, 16 are opened, the locking head 35 is moved to the claw portion 16 'as the connecting body 3 is lowered by its own weight. , 16 'without any engagement (FIG. 10B). When the lowermost portion of the locking head 35 is engaged with the concave portion 16 "of the locking claw piece 16 and hits the roller 37b, the roller 37b is removed from the concave portion 16" as the locking head 35 is lowered. As a result, the unlocking means 37 is lowered downward along the guide plate member 36b (FIG. 10C), and the locking head 35 also comes out below the hanging body 1 (FIG. 10D).

Therefore, the wire ropes 8, 8 are unwound as they are, the hook block 2 is lowered by its own weight, and the hook block 2 is lowered to the vicinity of the work floor, thereby connecting the connecting pins 2 to each other.
If the connecting body 3 is connected to the hook block main body 21 by 4, the lifting work of a relatively light lifting material can be quickly performed in a two-hanging state. It should be noted that, as is already apparent to those skilled in the art from the above description, the number of the top pulley 7 at the end of the boom and the number of pulleys 22 of the hook block 2 are four or more,
When, for example, four wire ropes 8 are wound around each pulley, switching of wiring from four to eight can be performed, and the lifting of very heavy lifting materials can be performed easily.

[0029]

FIG. 11 shows a different embodiment of the switching mechanism of the number of wire ropes. Its basic configuration is the same as that of the first embodiment shown in FIG. 3, except that the connecting body 3A is not provided with the locking head 35 and the locking means 15 is provided in the suspension 1A. The configuration is not provided. Therefore, the stopper 55 for connecting the connecting body 3A to the hanging body 1A and performing wiring is provided in the box body 11. Further, in the hanging body 1A, the main locking means having the same configuration as the auxiliary locking means 40 of the first embodiment and the locking ring 38 at the distal end of the connecting body 3A are indispensable. . That is, the locking means 1 of the first embodiment.
5, instead of being locked by the locking head 35, the locking is performed only by the main locking means (auxiliary locking means 40). Although the configuration is simpler than that of the first embodiment,
Needless to say, there is an effect of easily performing the wiring in the two-hanging state and the four-hanging state.

[0030]

According to the mechanism for switching the number of wire ropes of a jib crane according to the present invention, the number of wire ropes 8 can be extremely easily and reliably increased by locking or releasing the connecting body 3 from the hanging body 1. Can be switched, which is convenient and greatly contributes to the improvement of the lifting work efficiency. Since the limit switch detects the height position of the locking head 35, the locking can be reliably performed, and the locking state of the connecting body 3 to the hanging body 1 is locked by the locking pin 43. Contributes to improved safety. In addition, there is no need for inspection by changing the crane, and there is also the convenience that the company's own machine can be used as is.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of a mechanism for switching the number of wire ropes.

FIG. 2 is a partially cutaway front view of a mechanism for switching the number of wire ropes.

FIG. 3 is a partially cutaway side view of FIG. 2;

FIG. 4 is a detailed view showing the internal structure of the hanging body.

FIG. 5 is a detailed side view of the hanging body.

FIG. 6A is a front view showing a connected body, and FIG. 6B is a partially cutaway side view of A.

FIGS. 7A and 7B are a front view and a side view showing different embodiments of the connector.

FIG. 8 is an enlarged view showing a connection state between a connection body and a hook block.

FIGS. 9A to 9D are enlarged views showing how to change a wire rope from two to four.

FIGS. 10A to 10D are enlarged views showing how to change a wire rope from four to two.

FIG. 11 is an enlarged view showing a main part of another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hanging body 11 Box 12 Guidance guide part 15 Locking means 16 Locking claw piece 16 'Claw part 16 "Depression 17 Spring 18 Pin 2 Hook block 21 Hook block main body 22 Pulley 23 Suspended hook 24 Pin 25 Connecting part 25' Connection pin hole 25 "Guide 3 Connection body 31 Lower part 31 'Connection hole 32b Guide plate 33, 33a Rope winding reel 34 Gear 34' Idle gear 35 Locking head 35a Projection 35b recess 36 Connection body 37 Unlocking means 37a Slide Piece 37b roller 38 locking ring

──────────────────────────────────────────────────続 き Continued on front page (72) Inventor Ken Mitsui 1-18-22 Nishiki, Naka-ku, Nagoya City Inside Nagoya Branch of Takenaka Corporation (72) Inventor Sadao Tanaka 4-1-1 Honcho, Chuo-ku, Osaka-shi No. 13 Takenaka Corporation Osaka Main Store (72) Inventor Yoshitada Koshihara 1-7-20 Hanazono Minami, Nishinari-ku, Osaka City Co., Ltd. Koshihara Co., Ltd. (56) References JP-A-61-174094 (JP, A (58) Field surveyed (Int. Cl. ⁷ , DB name) B66C 13/00 B66C 23/66 B66D 3/08

Claims (7)

(57) [Claims] 1. A hanging body whose upper end is supported by a support shaft and hung at a tip end of a boom of a jib crane, a hook block having a hanging hook attached to a lower part thereof, and the hook block and the hanging body. The hanging member is formed of a box having a guiding guide portion opened downward, and a pair of engaging members is provided at an upper portion of the guiding guide portion. The hook block is provided with a plurality of pulleys each of which wraps a plurality of wire ropes suspended from at least two top pulleys attached to the end of the boom. And a connecting portion for connecting the connecting member, wherein the connecting member is provided with a rope winding reel for fixing an end of a wire rope wound around a pulley of the hook block, Is formed in a shape that can be connected to the connecting portion of the hook block, and has a projection that is inserted into the guide portion of the hanging body and can be locked by the locking claw of the locking means. A stop head is attached to the upper end of the link,
Below the locking head, there is provided an unlocking means having a roller capable of releasing the locking state of the protruding piece locked by the locking claw piece, and locking the connected body to the hanging body. Or a structure in which the number of wire ropes is switched by detachment. Locking means wherein suspending hook member is disposed proximal portion symmetrically is rotatably supported by a pin across the center line pair of locking pawls, the engagement Tometsumehen Is formed in an upwardly-facing claw portion, a substantially middle position inside the claw portion is formed in a concave portion, and the rear surface of the locking claw piece is biased inward by a spring. The body locking head is formed by projecting a protruding piece having a concave portion on the lower surface that engages with the claw portion of the locking means to protrude from a guide plate material attached to an upper portion of the connecting body, and the unlocking means includes: Rollers are installed on the left and right sides of a pair of slide pieces sandwiching the guide plate material, and are slidably mounted on the guide plate material so that the rollers can engage with the concave portions of the locking claw pieces. wherein, wire rope number of jib crane according to claim 1 Switching mechanism. 3. A full Kkuburokku is entirely covered with hook block body, at a substantially central position of the hook block body, the connecting portion of the shaped pocket provided with a guide upper end edge is formed in the upper opening A connection pin hole is formed at a position of the hook block main body corresponding to a substantially central position in the connection portion, while a lower portion of the connection body is formed in an arc shape that fits in the connection portion of the hook block, A connection hole is formed at a position corresponding to the connection pin hole, and a pin is inserted through the connection hole and the connection pin hole so that the connection body is restrained by the hook block. The mechanism for switching the number of wire ropes of the jib crane according to claim 1 . The method according to claim 4] Consolidated body, rope winding reel is disposed at least two rotatably to fastened the ends of the wound around the wire rope to the hook block, the side surfaces of each of rope winding reel 2. A mechanism for switching the number of wire ropes of a jive crane according to claim 1 , wherein a gear is mounted, and an idle gear meshing with each gear and rotating synchronously in the same direction is provided. . The box body 5. A suspended seat body, a plurality of limit switches for detecting the position locking head with the increase of the coupling body to sequentially contact are arranged in different desired heights The mechanism for switching the number of wire ropes of the jib crane according to claim 1 , characterized in that: The box body 6. hanging hook body, which guide sleeve is bored on the center line, the locking head of the connector and locking ring is provided which matches the guide sleeve of the box body On the other hand, on one side of the hanging body, an auxiliary locking means having a locking pin that moves forward and backward in the guide sleeve via a bell crank connected to a linear actuator is installed, characterized in that in the locking pin is inserted into the guide sleeve and the locking ring is locked state is configured to be locked by the operation of the linear actuator apparatus, according to claim 1
Switching mechanism for the number of wire ropes in a jib crane. 7. The complement Sukegakaritome means, configured to operate by a control signal confirming that the locked things or engagement with the locking means of the connecting member engaging head hanging hook body is released The mechanism for switching the number of wire ropes of a jib crane according to claim 6 , characterized in that: