JP2508109Y2 - Simultaneous telescopic boom - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention provides a multi-stage telescopic boom having a total of four or more booms, a telescopic cylinder, an extension wire that is linked to the telescopic movement of the telescopic cylinder, and a reduction wire. The present invention relates to a simultaneous telescopic boom that can be telescopically expanded and contracted simultaneously with a wire.

(Prior Art) As a conventional telescopic boom of this type, for example,
There is something like the one shown in the figure. In the conventional simultaneous telescopic boom shown in FIG. 5, a total of five booms 111 to 115 are successively connected in a telescopic manner to form a telescopic boom 101, and a first stage boom 111 and a second stage boom thereof. The telescopic cylinder 102 is provided between the booms 112 and 112, and the booms 113 to 11 in the third stage and thereafter
The boom 5 can be expanded or contracted by boom expansion wires 131 to 133 and contraction wires (not shown) that are interlocked with the expansion and contraction movement of the expansion cylinder 102.
The base ends (indicated by reference numeral 131a) of the respective extension wires (three in total) are connected to the first stage boom 111, respectively.
Further, the wire 131 for extending the third stage boom 113 is wound around one sheave 152B, and then the tip end portion 131b of the wire 131 is connected to the base end portion of the third stage boom 113 to extend the fourth stage boom 114. The wire 132 for use in the wire is wound around two sheaves 153B and 154A in total, and then the tip end portion 132b of the wire is connected to the end of the third stage boom 113, and the wire 133 for extending the fifth stage boom 115 has a total length of 3 in total. After being wound around one of the sheaves 154Ba, 155A, 154Bb, the wire tip portion 133b is connected to the base end portion of the fifth stage boom 115 and stretched.

These extension wires (especially the problem is the 4th and 5th boom extension wires 132 and 13)
In 3), it is necessary to wrap it around a sheave pivotally supported on the boom side and to connect the wire tip end to one of the booms. In the conventional simultaneous telescopic boom shown in FIG. Are directly supported on the boom by individual shafts, and the ends of the respective extension wires are also connected to the boom via individual supports (reference S).

(Problems to be solved by the invention) However, in the conventional simultaneous telescopic boom shown in FIG. 5, each extension wire (especially the wire 132 for extending the fourth stage boom and the wire for extending the fifth stage boom) is used. Each of the sheaves (133) wound around is directly pivotally supported by the boom independently, and the tip ends 132b, 133b of the extension wires 132, 133 are also directly connected to the boom through the dedicated support S. There is a problem that the number of connecting points between the wire tip and the boom increases, and the work of assembling them is troublesome.

The present invention provides a simultaneous telescopic boom capable of simplifying the supporting structure of the extension wire in view of the problems of the assembling structure of the sheave and the extension wire tip portion in the conventional simultaneous telescopic boom described above. The purpose is to do.

(Means for Solving the Problem) The present invention configures a multi-stage telescopic boom by sequentially connecting a total of four or more booms in a telescopic manner, and the first stage boom and the second stage of the telescopic booms. A telescopic cylinder is provided between the boom and the boom, and is located on the tip side of the boom located on the base end side between two booms adjacent to each other from the second stage boom to the final stage boom. The extension wires that act to extend the boom in conjunction with the extension movement of the telescopic cylinder are respectively interposed, and the base ends of the extension wires are connected to the first stage boom, and the extension wires are extended. The extension wire for extending the boom of the fourth and subsequent stages of the extension wire is supported by the front end portion of the boom located on the base end side between the two booms extended by the extension wire. More sheaves And one or more sheaves supported by the base end of the boom located on the tip end side, and then the tip end of the extension wire is connected to one of the two booms. At the same time, a reduction wire that interlocks with the contraction movement of the telescopic cylinder to contract the booms of the third and subsequent stages is provided. A simultaneous telescopic boom capable of simultaneously expanding and contracting the booms of the second and subsequent stages, wherein each boom has two or more sheaves around which a single extension wire is wound, or one sheave. Whether the boom to which the distal end of the extension wire is connected supports the support together with one sheave on a single shaft, and allows the support to support another sheave. It is characterized in that by connecting the distal end of the extension wire.

(Operation) According to the present invention, in the simultaneous telescopic boom having four or more booms, the extension wire for extending the booms of the fourth and subsequent stages is wound around at least two sheaves, and then the wire ends thereof are wound. Part is connected to the boom via a support, but supporting the support with one sheave on the boom on a single axis and allowing the support to support another sheave or the tip of the extension wire. Since they are connected, the sheave or wire tip supported or connected to the support need not be directly attached to the boom. That is, the support can be attached to the boom together with the sheave by the shaft for supporting the sheave while the sheave or the tip of the wire is previously supported or connected to the support.

(Effects of the Invention) Therefore, in the simultaneous telescopic boom of the present invention, the sheave or the wire for extension is attached to the boom by the shaft together with the sheave in a state where the tip of the sheave or the extension wire is attached to the support in advance. There is an effect that the number of man-hours for directly assembling the tip end or the like to the boom is reduced, and the assembling work for the tip end of the sheave or the extension wire is simplified.

(Embodiment) An embodiment of the present invention will be described with reference to FIG. 1 and FIG.

The simultaneous telescopic boom of this embodiment has a total of five booms.
The telescopic boom 1 is a five-stage telescopic type in which 11 to 15 are successively connected in a telescopic manner, and a telescopic drive mechanism for telescopically operating the telescopic boom 1.

The telescopic drive mechanism is linked to the telescopic cylinder 2 provided between the first stage boom (base end boom) 11 and the second stage boom 12 counting from the base end side, and the extension movement of the telescopic cylinder 2. And a total of three extension wires 31, 32, and 33 that act to extend the booms 13 to 15 on and after the third stage, and the third and subsequent stages in conjunction with the contraction movement of the telescopic cylinder 2. Each boom 13-15
And one reduction wire 4 for reducing.

The telescopic cylinder 2 has an appropriate telescopic stroke according to the length of the base boom 11, and the telescopic boom with the cylinder rod 21 side facing the boom base end side and the cylinder tube 22 side facing the boom tip side. 1 and fixes the tip end of the cylinder rod 21 to the base end 11a of the base end boom 11 and attaches the tip end (top side) of the cylinder tube 22 to the base end end 12a of the second stage boom 12. It is fixed. A total of two sheaves 41, 42 are attached to the position near the tip of the cylinder tube 22 so as to be close to each other in the cylinder expansion-contraction direction. The sheaves 41, 42 are for winding the reduction wire 4.

A long support 9 having a length substantially the same as the length of the base boom 11 is installed above the installation position of the telescopic cylinder 2 in the telescopic boom 1. This long support 9
Is for supporting the proximal end boom connecting side end portion 4a of the reduction wire 4 at a position near the distal end of the proximal end boom 11, and the proximal end side of the long support 9 is located at the proximal end of the proximal end boom 11. It is fixed to the section. Further, a sheave 43 for winding the reduction wire 4 around the tip end of the long support 9 as described later.
Is installed.

The extension wire 3 is a first extension wire 31 for extending the third stage boom 13 with respect to the second stage boom 12.
And a second extension wire 32 for extending the fourth stage boom 14 with respect to the third stage boom 13, and a fifth stage boom (tip boom) 15 with respect to the fourth stage boom 14. A total of three wires are used, including a third extension wire 33 for extending the wire. First to third extension wires 31, 32, 33
As shown in FIG. 3, one pair is provided on each of the left and right side portions of the telescopic boom 1. The first extension wire 31 is installed between the second stage boom 12 and the third stage boom 13,
The second extension wire 32 is installed between the third stage boom 13 and the fourth stage boom 14, and the third extension wire 33 is located at the fourth stage.
It is installed between the step boom 14 and the tip boom 15.
These extension wires 31, 32, 33 have their respective proximal end portions 31a, 32
The a and 33a are respectively connected to the base end portion 11a of the base end boom 11. In addition, these extension wires 31, 32, 33 need to be made longer as the boom located on the front side is operated, and the longer the wire is, the more the sheave for winding the wire is increased. It is necessary to increase the number. That is, the first extension wire 31 for extending the third boom 13 is the first extension wire 31.
After winding from the side of the step boom 11 around one sheave 52B pivotally supported on the inner surface of the side wall of the tip portion 12b of the second step boom 12, the wire tip portion 31b is attached to the base end portion 13a of the third step boom 13. The second extension wire 32, which is connected to the outer surface of the side wall of the third stage boom 14 and extends the fourth stage boom 14, extends from the side of the first stage boom 11 to the inner surface of the side wall of the tip portion 13b of the third stage boom 13. After the first sheave 53B pivotally supported and the second sheave 54A pivotally supported on the outer surface of the side wall of the base end portion 14a of the fourth stage boom 14, a total of two sheaves are wound around the wire tip portion 32b. The third extension wire 33, which is connected to the inner surface of the side wall of the third stage boom tip portion 13b (support 71 described later) and is used for extending the tip boom 15, is the first extension wire 33.
A first sheave 54Ba pivotally supported from the side of the step boom 11 to the inner surface of the side wall of the tip portion 14b of the fourth boom 14 and a second sheave 55A pivotally supported to the outer surface of the side wall of the base end 15a of the tip boom 15. Inner surface of the side wall of the fourth boom tip portion 14b (support 73 described later)
After sequentially winding the three sheaves 54Bb pivotally supported on the three sheaves in total, the wire tip 33b is attached to the tip boom base end 1
They are installed by connecting to the outer surface of the side wall of 5a (support 72 described later).

In the telescopic boom 1, the reduction wire 4 has its first end 4a connected to a position near the tip of the long support 9, and has a first sheave 42 pivotally supported by the cylinder tube 22,
A second sheave 43 pivotally supported on the tip of the long support 9,
The wire tip side 4b is connected to the tip portion 15b of the tip boom 15 after being sequentially wound around the third sheave 41 pivotally supported by the cylinder tube 22.

In the simultaneous telescopic boom of this embodiment, when the telescopic cylinder 2 is extended from the contracted state, the second stage boom is expanded.
Simultaneously with the extension of the base boom 11, the tension 12 is generated in each of the first to third extension wires 31, 32, 33 in association with the extension of the boom 11, and each boom 13, 3 14,15
Will be stretched. Further, when the telescopic cylinder 2 is contracted from the extended state of the telescopic boom 1, the telescopic cylinder 2 causes the second stage boom 12 to contract, and at the same time tension is generated on the contraction wire 4 and the tip boom 15 is pulled back. As a result, the entire telescopic boom 1 is contracted.

A sheave 53B pivotally supported on the inner surface of the side wall of the tip portion 13b of the third stage boom 13, a sheave 54Ba pivotally supported on the inner surface of the side wall of the tip portion 14b of the fourth stage boom 14, and a fifth stage boom 15 The sheave 55A axially supported on the outer surface of the side wall of the base end portion 15a of the boom is a single shaft 63B, 64Ba, 65A together with the supports 71, 72, 73, as shown in FIGS. Supported by. A flat plate having a relatively small area is used for each of the supports 71, 72, 73, and the upper and lower edges of the support are bent inward (or outwardly) near the sheave wrapping part to remove the wire. I'm stopping. The tip 71b of the second extension wire 32 is connected to the support 71 located at the tip 13b of the third stage boom 13, and the support 71 is
The support 73 located at the tip 14b of the step boom 14 has a shaft 6
Another sheave 64Bb is pivotally supported by 4Bb, and the sheave 64Bb is further supported by the support 72 located at the base end portion 15a of the tip boom 15 with a third sheave 64Bb.
The distal end portion 33b of the extension wire 33 is connected. In this way, each of the supports 71, 72, 73 can be used as a retainer for the wire wound around the sheave, and as a connecting portion of the wire tip portions 32b, 33b or a mounting portion of another sheave 54Bb,
By attaching the wire tips 32b, 33b or the sheave 54Bb to the support, they do not have to be attached directly to the boom. Therefore, with the wire tips 32b, 33b and the sheave 54Bb being supported in advance on the support (71 to 73) side, the support is attached to the boom together with the sheave by the shaft for the sheave shaft support. Assembling work can be done and the number of assembling steps can be reduced. In particular, since the number of man-hours for assembling on the boom side, which is relatively difficult to work, can be reduced, the assembling work becomes easy.

In the illustrated embodiment, a 5-step telescopic boom is used, but a 4-step telescopic boom or a 6-step telescopic boom is used.
The structure of the present invention can be applied to more than one step. In the case of a 4-stage simultaneous telescopic boom,
The fifth step boom 15 may be omitted from the five-step telescopic type shown in the figure, and the third extension wire 33 may be removed.

[Brief description of drawings]

FIG. 1 is a side view of a simultaneous telescopic boom according to an embodiment of the present invention, FIG. 2 is a partially enlarged view of the simultaneous telescopic boom of FIG. 1, and FIGS. III-III and
IV-IV sectional drawing and FIG. 5 are side views of a conventional simultaneous telescopic boom. 1 ... Telescopic boom 2 ... Telescopic cylinder 4 ... Reducing wire 11 ... 1st stage boom (base end boom) 12 ... 2nd stage boom 13 ... 3rd stage boom 14 ... 4th Stage boom 15 …… 5th stage boom (tip boom) 31,32,33 …… Extension wires 31b, 32b, 33b …… Wire tip 53B, 54A …… Sheave 54Ba, 54Bb …… Sheave 63B, 64Ba …… Axis 65A …… Axis 71,72,73 …… Support

Claims (1)

(57) [Scope of utility model registration request] 1. A multi-stage telescopic boom (1) is constructed by sequentially connecting a total of four or more booms (11 to 15) in a telescopic manner, and the first stage boom (11) of the telescopic boom (1). ) And the second stage boom (12) with the telescopic cylinder (2) interposed, and the second stage boom (12) and the subsequent last stage boom (1).
Two booms (12 and 13, 13 and 1) adjacent to each other up to 5)
Boom (12,13,1) located on its proximal side between 4, 14 and 15)
4) The extension wires (31, 32, 33) for extending the boom (13, 14, 15) located on the tip side with respect to 4) in conjunction with the extension movement of the telescopic cylinder (2) are respectively interposed. Further, the base ends (31a, 32a, 33a) of the respective extension wires (31, 31, 33) are connected to the first stage boom (11), and the respective extension wires (31, 31) Of the extension wire (32, 33) for extending the boom (14, 15) of the fourth and subsequent stages of the
33) is the tip (13b, 14b) of the boom (13, 14) located on the proximal side between the two booms (13, 14, 14 and 15) that are extended by the extension wire (32, 33). ) Supported by one or more sheaves (53B, or 54Ba and 54B)
b) and the base end (14a, 14a, 15) of the boom (14, 15) located on the tip side.
15a) supported one or more sheaves (54A, 55A)
After sequentially winding the wire around the wire, attach the ends (32b, 33b) of the extension wires (32, 33) to the two booms (13 and 14, 14 and 15).
One of the booms (13, 15) is connected to one of the booms (13, 15), and the booms (13, 14, 15) of the third and subsequent stages are contracted in conjunction with the contraction movement of the telescopic cylinder (2). The first-stage boom (11) is provided by the expansion / contraction movement of the expansion / contraction cylinder (2) through the reduction wire (4)
On the other hand, it is a simultaneous telescopic boom capable of simultaneously expanding and contracting the booms (12 to 15) of the second and subsequent stages, wherein a single extension wire (32 or 33) of the booms is used. A boom (13, 3) having two or more sheaves (54Ba, 54Bb) to be wound around or one sheave (53B or 55A) and a tip end portion (32b or 33b) of the extension wire (32 or 33) being connected. 14,15) support (71,72,73) with one sheave (53B, 55A, 54Ba) on single axis (63B, 65A, 64B)
Support in a) and support (71,72,73)
A simultaneous telescopic boom, characterized in that the other sheave (54Bb) is supported by or the tip end portions (32b, 33b) of the extension wires (32, 33) are connected.