JPH05155585A - Device for storing jib of crane - Google Patents

Abstract

PURPOSE:To easily attach and detach the storage pins of jib supporting mechanisms for storing and supporting a jib in storing or projecting the jib. CONSTITUTION:To store or project a jib 2, the jib 2 is raised by jib raising means 22 and is pushed by jib pushing means 20, 21 toward the end of a boom and thereby deviation of the pin holes of jib supporting mechanisms 9, 10 from each other can be corrected, the jib supporting mechanisms 9, 10 storing and supporting the jib 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jib storage device for a crane, which stores a jib added to the tip of a boom in the boom when not in use.

[0002]

2. Description of the Related Art A jib is stored on a side surface of a boom (horizontal hugging type) or on a lower surface of a boom in a horizontal state (lower hugging type), and the jib can be attached to the boom at a plurality of places (usually, a jib end portion and a base end portion). Supported.

Conventionally, as the jib supporting means, a support fitting having pin holes is provided on both the boom and the jib, and a means for connecting both the support fittings with a storage pin is used.

[0004]

However, when the crane is operated with the jib retracted, the jib tends to slide down due to its own weight, so that a large load acts on the storage pin, making it difficult for the jib to come off when the jib is extended. There was a problem.

Further, when the jib is retracted, the jib may slide down in the same manner as described above when the jib is pulled toward the boom side, so that the pin hole is displaced and it takes time to insert the storage pin.

[0006] Therefore, the present invention provides a jib storage device for a crane in which the displacement of the pin hole can be corrected when the jib is stored and extended so that the storage pin can be easily attached and detached.

[0007]

According to a first aspect of the present invention, a jib is stored on a side surface of a boom provided on an upper swing body so as to be capable of undulating or on a lower surface in a horizontal state of the boom, and the jib is attached to the boom and the jib. In a crane configured to be supported at a storage position by support fittings provided on both sides and a storage pin inserted across the pin holes of both support fittings, a jib lifting for lifting the tip of the jib in the jib retracted state And means for converting the lifting force of the jib lifting means into a jib moving force in the boom tip direction.

According to a second aspect of the present invention, in the structure of the first aspect, as the jib lifting means, a push-up member which comes into contact with the upper revolving structure from below to the tip of the jib stored in the boom in the maximum collapsed state of the boom. Is provided.

According to a third aspect of the invention, in the construction of the first aspect, the jib lifting means is constituted by a winch provided on the boom and a rope which is driven by the winch to pull up the jib tip. Is.

[0010]

According to the above construction, when the jib is stored and extended, the jib is lifted by the jib lifting means and further pushed in the boom tip direction by the jib pushing means.
That is, the jib is pushed back to the position before it slides down by the forces in these two directions. As a result, the shifted pin holes are aligned with each other, so that the storage pin can be easily attached and detached when the jib is stored and extended.

In this case, according to the second aspect of the present invention, the above operation is exhibited only by maximizing the boom, so that the operation is simple.

On the other hand, according to the structure of claim 3, the winch and the rope can be used also as means for overhanging the jib and moving the jib between the retracted position and the drooping position during the retracting operation.

[0013]

Embodiments of the present invention will be described with reference to the drawings.

Reference numeral 1 is a boom mounted on an upper swing body (swing frame) U of the crane so as to be able to rise and fall, and 2 is a jib.

The boom 1 is usually constructed by three or more booms fitted in a telescopic manner, but here, for simplification of the drawing, a two-stage boom consisting of a basic boom 1a and a movable boom 1b. It has a boom configuration.

The boom 1 is provided with a jib mounting shaft (not shown on the right side) 3 horizontally protruding from the left and right ends of the tip of the movable boom 1b.

The jib 2 has a bifurcated rotary jib foot 4 which is rotatable around an axis X (shown in FIGS. 2 and 6) in the length direction of the jib on one side of the base end portion, and a fixed jib foot which is also bifurcated on the opposite side. 5 are provided respectively.

During the jib work, the jib 2 is extended to the tip of the boom while the jib feet 4 and 5 on both sides are engaged and connected to the jib mounting shafts 3 on both sides as shown by the phantom line A in FIG. After the end, it is drooped downward from the position of the phantom line a, then twisted by approximately 270 ° to the state shown by the solid line, and then drawn and stored on the side surface of the basic boom 1a as shown by the phantom line B.

Reference numeral 6 is a winch used for this jib pulling operation (an operation for hanging the jib 2 from the side surface of the boom when the jib is extended), 7 is a jib pulling rope which is wound and rewound by the winch 6, and 8 is This is a rope stopper on the jib 2 side to which the tip of the jib pulling rope 7 is stopped.

As shown in FIGS. 1 to 5, the jib 2 is stored in a horizontal holding manner in a vertical posture in which the rotating jib foot 4 is located on the lower side and the fixed jib foot 5 is located on the upper side. The end side jib support mechanism 9 and the tip end portion thereof are supported by the boom 1a by the tip side jib support mechanism 10, respectively.

The two sided jib supporting mechanisms 9 and 10 will be described. First, the base side jib supporting mechanism 9 for supporting the base end portion of the jib.
As shown in FIGS. 2 and 3, a pair of front and rear boom-side brackets 11 and 11 projecting from a lower portion of the side surface of the basic boom 1a in a horizontal boom state, and a lower portion of the jib 2 (the jib storage and boom. The lower part in the horizontal state, and the jib side brackets 12 and 12 protruding from the lower part of the jib 2 described below are the same. , 12 are inserted across the pin holes 11a, 11a, 12a to support the jib base end.

As shown in FIGS. 1 and 2, the jib 2 is stored in such a positional relationship that the rotating jib foot 4 engages with the left jib mounting shaft 3 in the fully retracted state of the boom. Further, the rotary jib foot 4 is provided with a fixed pin hole 4a, and the jib foot pin 14 is inserted into the fixed pin hole 4a when the jib is extended, so that the rotary jib foot 4 is prevented from coming off from the left jib mounting shaft 3.

On the other hand, the tip side jib support mechanism 10 has a support frame 15 (the winch 6 is attached to the support frame 15) protruding from the side surface of the basic boom 1a as shown in FIG. A link 17 attached to the frame 15 by a horizontal shaft 16 in the left-right direction, a bracket 18 fixed to the upper portion of the jib 2, and these links 17
And the front end side storage pin 19 inserted across the pin holes 17a and 18a of the bracket 18.

When the jib is extended, the link 17 is pivoted upward about the horizontal shaft 16 and fixed by the storage pin 19 as shown by the phantom line in FIG.

A guide frame 20 is provided on the lower surface of the support frame 12 while the guide frame 20 is provided on the upper surface of the tip of the jib 2.
A contact member 21 is provided that contacts the front side of the guide frame 20 at the storage position.

The guide frame 20 and the contact member 2
The surfaces 20a and 21a that are in phase contact with each other are formed as inclined surfaces that can convert the upward force acting on the contact member 21 into a jib moving force in the boom tip direction.

Further, as shown in FIGS. 1, 4 and 5, when the boom 1 is set on the upper revolving structure U in the forward and maximum laid-down state during traveling of the crane, the jib 2 is abutted and pushed up from below. A push bolt 22 as a push-up member is attached upward via a bracket 23.

Next, the operation will be described.

As shown by the phantom line B in FIG. 6, during the crane work in a state where the jib 2 is stored, the jib 2 has a vertically downward force A (force B in the length direction of the jib and a direction perpendicular thereto) due to its own weight. The resultant force of the force C acts on the storage pins 13 and 19 of the jib support mechanisms 9 and 10 on both the base end side and the tip end side.

Therefore, since the storage pins 13 and 19 of the jib support mechanisms 9 and 10 are twisted in this state, it is difficult for the pins 13 and 19 to come out when the jib is extended.

Therefore, when the boom 1 is set to the forward and maximum laid-down state during traveling of the crane when the jib is extended as shown in FIG. 1, the tip of the jib comes into contact with the push bolt 23 and is pushed up. The contact member 21 and the guide frame 20 described above convert the moving force of the jib 2 in the boom tip direction.

That is, the jib 2 is pushed up, and
By being pushed toward the tip of the boom, the storage pin 13,
The pin load due to the bidirectional forces B and C applied to 19 can be canceled. Therefore, the storage pins 13 and 19 can be easily pulled out when the jib is extended.

On the other hand, when the jib is stored after the jib work, the same force A (B, C) as described above acts when the jib 2 is pulled from the solid line position in FIG. 6 to the storage position of the virtual line b. Also, by setting the boom 1 in the state shown in FIG. 1, it is possible to push the jib 2 back to a predetermined position (correct the deviation of the pin hole) by the same action as described above, so that the storage pins 13 and 19 can be easily installed. Can be inserted into.

At this time, the pin load of the jib foot pin 14 shown in FIG. 2 is also reduced, so that the pin 14 can also be easily removed.

Other Embodiments (1) In the above embodiment, the push bolt 22 is provided on the upper revolving structure U as the jib lifting means, but the winch 6 and the jib pulling rope 7 can be used as they are as the jib lifting means. Good. In other words, the jib lifting means (winch 6, rope 7) may also be used as a jib operating means for jutting the jib and storing it (invention of claim 3).

(2) In the above embodiment, the storage pin 13 is inserted in the front-rear direction in the base end side jib support mechanism 9, and the storage pin 19 is inserted in the left and right direction in the front end side jib support mechanism 10. The insertion directions of the storage pins 13 and 19 may be changed appropriately.

(3) In the above embodiment, the rotary jib foot 4 is attached to one side of the base end portion of the jib 2, and the rotary jib foot 4 is attached.
In the state in which the jib 2 is connected to the left jib mounting shaft 3, the case where the jib 2 is suspended and twisted using this connection point as a fulcrum has been described as an example. However, as shown in JP-A-3-158393, etc. A fixed jib foot and a rotary connecting portion for overhanging and storing the jib may be provided on one side of the base end portion, and the jib may be suspended and twisted around the connection point between the rotary connecting portion and the jib mounting shaft as a fulcrum. ..

(4) In the above-mentioned embodiment, the horizontal holding type crane for storing the jib 2 on the side of the boom is taken as an example, but the present invention is also applicable to the lower holding type crane for storing the jib on the boom lower surface. It can be applied similarly.

[0039]

As described above, according to the present invention, when the jib is stored or extended, the jib is lifted by the jib lifting means and further pushed by the jib pushing means in the boom tip direction. It can be pushed back to the position before it slides down by the force of.

As a result, the shifted pin holes can be aligned and the load applied to the storage pin can be significantly reduced. Therefore, the storage pin can be easily attached and detached with almost no resistance when the jib is stored or extended.

In this case, according to the second aspect of the present invention, the above operation can be performed only by maximizing the boom, so that the operation is simple.

On the other hand, according to the third aspect of the present invention, the winch and the rope can be used also as means for overhanging the jib and moving the jib between the retracted position and the drooping position during the retracting operation.

[Brief description of drawings]

FIG. 1 is a side view of a jib stored state showing an embodiment of the present invention.

FIG. 2 is a partial cross-sectional enlarged view of a jib base end portion (boom front end portion) in the state of FIG.

3 is a sectional view taken along line III-III in FIG.

FIG. 4 is an enlarged view of a jib tip portion (boom base end portion) in the state of FIG. 1.

5 is a sectional view taken along line VV of FIG.

FIG. 6 is a side view showing a state in which the jib is being stored (extended) in the same embodiment.

[Explanation of symbols]

1 boom 2 jib 9 base end side jib support mechanism 11, 11 boom side bracket (support metal fitting) 12 of the same support mechanism 12 same jib side bracket (support metal fitting) 13 same storage pin 10 tip side jib support mechanism 17 link of the same support mechanism (Supporting bracket) 18 Bracket (supporting bracket) 19 on the same jib 19 Storage pin 22 Push bolt as jib lifting means 20 Guide frame constituting jib pushing means 21 Contact member

Claims (3)

[Claims] 1. A jib is stored on a side surface of a boom that is provided up and down on an upper swing body or a lower surface when the boom is in a horizontal state, and the jib is provided with a support fitting provided on both the boom and the jib, and both of them. In a crane configured to be supported at a storage position by a storage pin inserted across a pin hole of a support fitting, a jib lifting means for lifting the tip of the jib in the jib storage state and a lifting force by the jib lifting means A jib storage device for a crane, comprising: a jib pushing means for converting into a jib moving force in a boom tip direction. 2. As the jib lifting means, a push-up member is provided on the upper revolving superstructure so as to come into contact with the tip end of the jib stored in the boom from below from the bottom of the boom. The jib storage device of the crane according to 1. 3. The jib of a crane according to claim 1, wherein the jib lifting means is constituted by a winch provided on the boom and a rope which is driven by the winch to pull up the tip of the jib. Storage device.