JPH053291U - Crane hook block fixing device - Google Patents

Abstract

(57) [Summary] [Purpose] The storage holding force is small, and it can be stored with the hook block in close contact with the bottom surface of the boom, thus making the storage form compact. [Structure] A fixing device that stores and holds a hook block that is hung from the tip of a crane boom on the bottom surface of the boom. The boom head is provided with a cam plate that guides and moves to the lower surface side of the boom while swinging and sliding the hook block along with the hoisting operation. On the other hand, the hook block is provided with a driven cam that comes into contact with the cam plate, and the contact point of the driven cam with the cam plate is displaced outward in a direction orthogonal to the line segment connecting the centers of the boom sheave and the hook block sheave. Set to do.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a crane hook block fixing device, and in particular, to a crane hook block suitable for being applied to a crane device such as a truck crane that needs to be fixed and held because it is installed in a vehicle. For fixed devices.

[0002]

[Prior Art]

 With a vehicle-mounted crane, it is dangerous if the hook block shakes when the vehicle is running, so it was common to secure it by hooking a wire between the hook and a part of the vehicle (bumper, etc.). . In such a fixing method, the wire is hung on the hook and the vehicle, and then the hook block is rolled up to apply tension to the wire. In such a method, excessive winding may cause damage to the vehicle. Therefore, it was necessary to make visual adjustments to the wire pulling conditions to the extent that excessive winding would not occur. Alternatively, it is known that a spring is used for the wire-hanging portion on the vehicle body side or a limit switch is used to prevent excessive winding.

However, in the above method, wire hooking is required for fixing the hook block, and workability is poor because connection with the vehicle is required, and there is a high risk of the wire hooking coming off. Alternatively, if the wire is attached in front of the driver's seat, there is a problem that it interferes with safe driving. Therefore, a method of directly storing the crane boom at the tip has been proposed.

In Japanese Laid-Open Patent Publication No. 2-209396, a lever is hung so that it can pivot on the tip of a crane boom, and a hook block rises and is fitted and connected to the tip of this lever. Techniques for lifting and holding fixedly are shown. Further, Japanese Utility Model Laid-Open No. 56-20979 proposes a technique in which a hook block abutting mechanism section is provided directly under the boom head, and the hook block is rotated around this, and the hook block is stowed under the boom. .

[0005]

[Problems to be solved by the device]

 However, in the former case, since a large storage and holding force is required, there is a drawback that a very large wire pulling force must be constantly applied. Also, in the latter case, the hook head is rotated around the impact mechanism provided on the lower end surface of the boom head, and therefore the storage form cannot be reduced, and the hook head does not move at the end of the boom head. It has the disadvantage that it is held in a bent shape and cannot be stored in a good shape.

The present invention focuses on the above-mentioned conventional problems and requires only a small storage holding force, and the hook block can be stored in a state in which the hook block is in close contact with the lower surface of the boom, so that the storage form can be made compact. It is an object of the present invention to provide a fixing device for a crane hook block that has been made into.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, a crane hook block fixing device according to the present invention is a fixing device for storing and holding a hook block suspended from a tip of a crane boom on a lower surface of the boom, and performing a hoisting operation of the hook block. The boom head is provided with a cam plate that guides and moves to the lower surface side of the boom while being swung and slid along with it.The hook block is provided with a driven cam that comes into contact with the cam plate, and the driven cam comes into contact with the cam plate. The points are set so as to deviate outwards orthogonal to the line segment connecting the centers of the boom sheave and the hook block sheave.

[0008]

[Action]

 According to the above configuration, the driven cam at the upper end of the hook block is brought into contact with the cam plate of the boom head by winding up the hook block. The cam plate is formed with a cam curve so as to pivotally move the hook block to the lower surface side of the boom. Therefore, the hook block moves to the lower surface side of the boom as the hoisting operation is performed. This turning movement is properly guided by the contact of the driven cam. Also, the contact point of the driven cam is deviated outward from the center connecting line between the sheave on the boom side and the sheave on the hook block side, so set the hook block so that the direction of rotation is the bottom side of the boom. In addition, when the hook block is stored on the bottom of the boom, the centers of the boom sheave and hook block sheave, and the contact points of the driven cam and cam plate form a triangular apex, and the wire is held by a stable holding mechanism. You can improve your strength.

[0009]

【Example】

 Hereinafter, a concrete embodiment of a fixing device for a crane hook block according to the present invention will be described in detail with reference to the drawings.

1 to 3 are side views of a hook block fixing device according to an embodiment applied to a truck crane in a retracted fixed state, a suspended state, and a rolled-up state. As shown in these drawings, a boom head 12 arranged orthogonally to the tip of the crane boom 10 is attached, and inside the head 12, a boom head 12 is extended from a wire drum (not shown) on the base end side of the boom 10. A sheave 16 around which the wire 14 is wound is attached. A hook block 18 is provided which is connected to the boom-side sheave 16 by a wire 14 and is hung from the wire. A hook 20 is mounted on the hook block 18 and is extended from the boom-side sheave 14. A sheave 22 around which the wire 14 is wound is attached. Therefore, the hook block 18 moves up and down by winding and winding the wire 14 at the tip of the boom 10, and transfers the suspended load hooked.

In such a crane, a cam plate 24 is attached to the lower side surface of the head 12 in order to store and fix the hook block 18 in the boom 10 in the embodiment. The cam plate 24 is mounted so as to project from the lower end of the head 12, and the cam curve thereof is first contacted with the hook block 18 by the hoisting operation, and is swung and slid with the boom side sheave 16 as the center of rotation. The hook block 18 is formed on the lower surface side of the boom 10 so as to be guided and moved in a parallel state. That is, the cam curve has an outer edge portion of the cam plate, which extends downwardly along the outer surface of the head 12 and protrudes from the center position of the boom sheave 16 from the head 12, as an inner radius of the head 12 (the base end of the boom 10). The curve of a quarter arc formed toward the side) is formed in the lower half of the cam plate 24.

On the other hand, on the upper end of the hook block 18, a cam roller 26 as a driven cam which is in rolling contact with a cam plate 24 attached to the boom head 12 is attached. The cam roller 26 is pivotally supported on the upper end portion of the side wall of the hook block 18 so as to come into contact with the cam surfaces of the pair of cam plates 24 when the hook block 18 moves upward due to the winding operation. That is, the cam roller 26 is provided so as to face each cam plate 24 so that a rotation surface is formed on the same plane as each cam plate 24, and when the hook block 18 rises, the cam roller 26 first contacts the cam plate 24. The hook block 18 is attached so that the upper half of the hook block 18 protrudes from the upper edge.

By the way, when the hook block 18 is in the suspended state shown in FIG. 2 or 3, the rotation centers of the sheave 22 and the boom-side sheave 16 are arranged on a vertical line, but the cam roller 26 is at the center thereof. It is attached so as to be offset from the connecting line outward (in the extending direction of the boom 10) by a distance E (see FIG. 3). This deviation distance E is set so that the hook block 18 rises and surely contacts the cam plate 24 of the boom head 12, and is smaller than the width dimension from the center of the boom sheave 16 to the outer edge of the cam plate 24. Is set. Therefore, the cam roller 26 abuts as the hook block 18 is lifted, but the cam roller 26 rolls along the cam surface of the cam plate 24 by continuously winding the wire 14, and the hook block 26 is hooked. It is possible to pivotally move 18 around the boom sheave 16 to the lower surface of the boom 10.

A stopper 28 is attached to the lower surface of the boom 10 so as to mitigate the impact when the hook block 18 pivots and joins. Although not shown, the stopper 28 is provided with a load detector so as to detect the storage of the hook block 18.

The operation of the storage fixing device of the hook block 18 configured as described above is as follows. While the crane is in use, the hook block 18 is in a state of being suspended by the wire 14 fed out from the boom head 12 as shown in FIG. When the crane work is finished from this state and the hook block 18 is to be stored, the wire 14 is wound up and the hook block 18 is raised. Thereby, as shown in FIG. 3, the cam roller 26 attached to the upper end of the hook block 18 is brought into contact with the cam plate 24 of the head 12. Since the contact position of the cam roller 26 is deviated outward from the center connecting line of the boom side sheave 16 and the hook block sheave 22 by E, the hook block 18 initially rotates about the cam roller 26, and The upper block edge 30 of the hook block 18 opposite to the cam roller mounting side abuts the cam plate 24. Then, by continuing to wind the wire 14, the hook block 18 pivotally moves along the cam curve of the cam plate 24, moves to the inner edge side of the boom head 12, and the stopper provided on the lower surface of the boom 10. 28 is abutted. Since the load detector is housed inside the stopper 28 and the stored state is detected, the winding of the wire 14 is finished and the wire is fixed.

With the hook block 18 stored and fixed, the center A of the boom sheave 16, the center B of the cam roller 26, and the center C of the hook block sheave 22 form a triangular apex, and the hook block 18 by the wire 14 is formed. The holding power of the will be strengthened, and stable storage and holding will be possible.

Although the cam curve of the cam plate 24 is formed in an arc in the above embodiment, it can be formed as a simple linearly inclined cam surface (imaginary line in FIG. 1), and further, the cam roller. 26 can also be appropriately changed such as a sliding type.

[0018]

As described above, the fixing device for the crane hook block according to the present invention is a fixing device for holding and holding the hook block suspended from the tip of the crane boom on the lower surface of the boom. The boom head is provided with a cam plate that guides and moves to the lower surface side of the boom while swiveling and sliding the hook block as it winds up.The hook block is provided with a driven cam that comes into contact with the cam plate. The contact point of the cam plate with the cam sheave is set so as to deviate to the outside orthogonal to the line segment that connects the centers of the boom sheave and the hook block sheave. It has the excellent effect that it can be stored in close contact with each other and the storage form can be made compact.

[Brief description of drawings]

FIG. 1 is a side view of a hook block fixing device according to an embodiment in a stored state.

FIG. 2 is a side view of the hook block in a suspended state.

FIG. 3 is a side view of a lifting end of a hook block.

[Explanation of symbols]

 10 Crane Boom 12 Boom Head 14 Wire 16 Boom Sheave 18 Hook Block 20 Hook 22 Hook Block Sheave 24 Cam Plate 26 Cam Roller 28 Stopper 30 Cam Top Edge of Block

Claims (1)

Claims for utility model registration: Claims: 1. A fixing device for storing and holding a hook block suspended from the tip of a crane boom on the lower surface of the boom, and swinging and sliding the hook block as it hoists. While the boom head is provided with a cam plate that guides and moves toward the bottom surface of the boom, the hook block is provided with a driven cam that contacts the cam plate, and the contact point of the driven cam with the cam plate is the boom sheave and the hook block sheave. A device for fixing a crane hook block, characterized in that it is set so as to be displaced outwards orthogonal to a line connecting the centers of the crane hook blocks.