JP2507256Y2 - Folding boom - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) This invention is designed so that the tip side boom can be undulated between the folded state and the extended state in which the tip side boom is substantially parallel to the base side boom. The present invention relates to a bending boom in which a tip side boom is rotatably and pivotally connected to a tip of the boom.

(Prior Art) As shown in FIG. 3, a conventional folding boom of this type is capable of undulating between a folded state in which a distal boom 2 is substantially parallel to a proximal boom 1 and a stretched extended state. As shown in FIG. 1, the tip side boom 2 is pivotally connected 3 to the tip of the base side boom 1 so that the tip side boom 2 can be raised and lowered.
The first and second links 6 and 7 pivotally connected to the tip end portion of the tip end and the tip end side boom of the tip end boom 2 are arranged on the left and right sides of the base end side boom 1 and the tip end side boom 2, respectively. The left and right ends of the left and right first and second links 6 and 7 are pivotally connected 8 in the space on the folding side, and the base end parts are connected 9a to the left and right positions near the tip of the boom 2 on the tip side. The tip portions of the pair of undulating cylinders 9, 9 are connected to the tip portions of the left and right first or second links 9b, and the pair of left and right undulating cylinders 9, 9 are configured to drive the tip side boom 2 up and down. ing.

By the way, in the conventional bending boom, the base end side boom 1 and the tip end side boom 2 have a hollow rectangular sectional shape. In the folded state of the folding boom, the opposing faces 1a, 2 of the boom 1 on the proximal end side and the boom 2 on the distal end side face each other.
a is configured to be close to each other, and the height dimension of the folding boom in the folded state is reduced. For this reason, the pair of left and right undulating cylinders 9, 9 are arranged so as not to overlap the booms 1, 2 in a plan view.

(Problems of the prior art) Although the conventional folding boom configured as described above has an advantage that the height dimension in the folded state is small, the undulating cylinders 9 and 9 are booms in a plan view. Since it is placed so that it does not overlap with 1 and 2, the width was large, which sometimes hindered the use of the folding boom in narrow spaces.

In the present invention, the base end side boom 1 and the tip end side boom 2 are partially modified in cross-sectional shape, and a pair of left and right undulating cylinders 9,
It is intended to provide a folding boom with a small width by changing the location of 9 and suppressing the height dimension in the folded state as much as possible.

(Means for Solving the Problems) In order to achieve the above object, the folding boom of the present invention is chamfered on the left and right end portions of the respective facing surfaces in the folded state of the base end side boom 1 and the tip end side boom 2. In the folded state, the left and right undulating cylinders 9 and 9 are positioned so that at least a part thereof is located between the chamfered portions facing each other in a state where the left and right undulating cylinders 9 are substantially parallel to the axis of the tip side boom 2. I configured it.

(Operation) With the configuration as described above, at least a part of the pair of left and right hoisting cylinders 9, 9 can be positioned within the width of the booms 1, 2, so the width of the folding boom should be reduced accordingly. Can be done.

(Embodiment) Next, an embodiment of the folding boom of the present invention will be described with reference to Figs.
It will be described with reference to the drawings.

As described above, the present invention partially changes the cross-sectional shapes of the base end side boom 1 and the tip end side boom 2 of the conventional bending boom, and changes the location of the pair of left and right undulating cylinders 9, 9. Therefore, the reference numerals 1, 1a2, 2a, 3 to 9 shown in FIG. 1 and described above as the prior art are also referred to as the same meanings in the following description.

In FIG. 1 and FIG. 2, the folding boom has chamfered portions 1b and 2b formed on the left and right end portions of the respective facing surfaces 1a and 2a in the folded state of the base end side boom 1 and the tip end side boom 2. . Further, the pair of left and right undulating cylinders 9 and 9 have their axes substantially parallel to the axes of the proximal boom 1 and the distal boom 2 in the folded state of the bending boom, and at least a part of each of the chamfered portions is opposed to each other. The positions of the couplings 9a and 9b are set so as to be located (between 1b and 2b).

In the folding boom of the present invention configured as described above, a part of the pair of left and right undulating cylinders 9 and 9 can be positioned within the width of the booms 1 and 2, so that the width of the folding boom can be reduced accordingly. Of.

In the above embodiment, the chamfered portion is formed by forming the facing surfaces 1a and 2a of the base end side boom 1 and the tip end side boom 2 in the folded state by bending plates bent in a mountain fold shape.
Although 1b and 2b are formed, it is needless to say that the chamfered portion may be formed only in the vicinity of both side edges of the facing surfaces 1a and 2a.

(Effect) Since the present invention configured and acting as described above can obtain a folding boom with good workability in a narrow space with a small width while suppressing the height dimension in the folded state as much as possible, The effect is great.

[Brief description of drawings]

1 is a side view of the folding boom of the present invention in a folded state, FIG. 2 is a sectional view taken along the line AA of FIG. 1, FIG. 3 is a side view of a conventional folding boom in a folded state, and FIG. FIG. 4 is a sectional view taken along line BB in FIG. Base end side boom; 1, tip end side boom; 2, first link; 6, second link; 7, undulating cylinder, 9, chamfered portion; 1b, 2b,

Claims (1)

(57) [Scope of utility model registration request] 1. A tip boom 2 is undulated at the tip of the base boom 1 so that the tip boom 2 can be undulated between a folded state in which the boom 2 is substantially parallel to the boom 1 and an extended state. The first and second links 6, 7 in which the base end portions are freely pivotally connected 3, and the base end portions thereof are pivotally connected 4, 5 to the tip end portion of the base end side boom 1 and the base end portion 2 of the tip end side boom 2, respectively. Are arranged on the left and right sides of the base end side boom 1 and the tip end side boom 2, respectively, and the tip ends of the left and right first and second links 6 and 7 are pivotally connected 8 in the space on the folding side, and the tip ends The tip ends of the pair of left and right undulating cylinders 9, 9 whose base end portions are respectively connected to the left and right positions near the tip of the side boom 2 are connected to the respective tip parts of the left and right first or second links, and With a bending boom configured to drive the boom 2 on the tip side by hoisting cylinders 9, 9. I, thereby forming a chamfered portion on the left and right side end portions of the facing surfaces of the folded state of the proximal-side boom and distal side boom, the left and right derricking cylinder in the folded state,
A bending boom, characterized in that its axis is substantially parallel to the axis of the boom on the tip side, and at least a part thereof is positioned between the facing chamfered parts.