JP2580596Y2 - Multi-stage telescopic boom with polygonal cross section - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-stage telescopic boom having a polygonal cross section, which is mounted on an aerial work vehicle and a crane truck, and more particularly, to a lateral movement of an intermediate boom when the multi-stage telescopic boom is extended. Regarding preventive measures.

[0002]

2. Description of the Related Art In general, a multi-stage telescopic boom mounted on an aerial work vehicle or the like is constructed such that a base boom, one or more intermediate booms, and a front end boom are inserted in a stretchable manner in order. Each of the booms is usually a tubular one having a square cross section.

In such a multistage telescopic boom having such a polygonal cross section, when a linear object such as a hydraulic pipe or a cable is arranged from the vehicle side on which the base boom is mounted to the tip of the tip boom, it is usually used. A sheave is provided at each of the distal end of the base boom, the base end of the intermediate boom, etc., and the linear object is wound around these sheaves, and is disposed between the inside of the base boom and the outside of the intermediate boom to the tip of the distal boom. I am trying to do it.

[0004]

By the way, in the multistage telescopic boom having the above-mentioned polygonal cross section, the linear object wound around the sheave at the base end of the intermediate boom is moved along with the extension of each boom. Various devices have been devised for slidably supporting the intermediate boom with respect to the base boom while sliding between the intermediate boom. In that case, as an example, a receiving member having a horizontal surface parallel to the lower surface is provided at the lower end inside the distal end of the base boom having a rectangular cross section, and a pad made of synthetic resin or the like is provided on the horizontal surface of the receiving member. It is conceivable to provide a slidable insertion hole for a linear object in the lower part of the receiving member while supporting the lower surface of the intermediate boom.

[0005] However, in the case of the above, since the lower surface of the intermediate boom is supported via the pad with respect to the horizontal surface of the receiving member, lateral movement of the intermediate boom during extension cannot be prevented.

Further, it is necessary to separately provide a slidable insertion hole of the linear material in the lower portion of the receiving member, becomes cumbersome its manufacturing work tasks.

The present invention has been made in view of the above points, and an object of the present invention is to change the cross-sectional shape of each boom to a polygonal shape and to improve a receiving member in accordance therewith, whereby a multi-stage telescopic boom is provided. An object of the present invention is to dispose the linear object so as to be easily slidable while reliably preventing the intermediate boom from laterally moving when it is extended.

[0008]

Means for Solving the Problems In order to achieve the above object, a solution taken by the present invention is that a base boom, an intermediate boom, and a tip boom are inserted and retracted in a stretchable order,
A sheave is provided at the base end of the intermediate boom, and a linear object such as a hydraulic pipe or a cable is wound around the sheave through the space between the base boom and the intermediate boom, and then extended to the distal end of the tip boom. Assuming that the multi-stage telescopic boom is used, each of the booms is formed in a polygonal cross section. A pair of left and right receiving members, each having a lower portion standing upright and an upper portion inclined outward so as to face the lower surface of the intermediate boom, are provided at a lower portion of each of the receiving members. It arrange | positions so that it may be comprised integrally via the connection member which connects the upright surface which opposes. Further, the lower surface of the intermediate boom corresponding to the inclined surface is slidable on the inclined surface at the upper portion of each of the receiving members, and is substantially orthogonal to the sliding direction.
Is attached to Rupa head to support immovably in an oblique transverse direction, it is obtained by a structure arranging the linear material slidably in the lower space in the inclined surface below the respective receiving member.

[0009]

With the above arrangement, in the present invention, each boom is
For example, the lower surface of the intermediate boom having a cross-sectional polygonal shape such as a hexagonal cross-section, and the lower surface of the intermediate boom having such a cross-sectional shape is inclined to the pair of right and left receiving members inclined outward to face the lower surface. Slidably supported via a pad.
Obliquely transverse to the sliding direction
Because it is immovably supported from direction, the lateral movement of the intermediate boom during extension of the multi-stage telescopic boom is reliably prevented.

Moreover, the linear object wound around the sheave at the base end of the intermediate boom is disposed in the lower space below the inclined surface which becomes an empty space by inclining the upper part outward. The linear object passing between the boom and the multi-stage telescopic boom will slide in the lower space below the inclined surface with the extension of the multi-stage telescopic boom, and the insertion hole for sliding the linear object will be separately worked. It is not necessary to provide on the receiving member.

Further , the left and right receiving members are provided at the lower portions thereof.
Integrally via a connecting member that connects opposing upright surfaces
, So that the left and right receiving members
In addition to being easy to align when arranging on the lower inside,
Due to the load from the intermediate boom acting on the inclined surface of the receiving member
Each receiving member is effectively prevented from being deformed, etc.
The boom is securely supported.

[0012]

As described above, according to the multistage telescopic boom having a polygonal cross section of the present invention, the lower surface of the intermediate boom in which each boom is formed in a polygonal cross section such as a hexagonal cross section,
Move from diagonal lateral direction with the inclined surface of a pair of left and right receiving members
Since the support is slidably and slidably supported, lateral movement of the intermediate boom during extension of the multistage telescopic boom can be reliably prevented. In addition, the linear object passing between the base boom and the intermediate boom is arranged in the lower space below the inclined surface, so that the linear object sliding along with the extension of the multi-stage telescopic boom requires additional work. Can be easily arranged. In addition, the left and right receiving members are
Because it is configured integrally with the connecting member that connects,
The positioning of the receiving member can be performed easily.
Effectively prevent deformation of each receiving member,
Can be reliably supported.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

2 and 3 show a multi-stage telescopic boom A having a polygonal cross section of an aerial work vehicle according to an embodiment of the present invention. The multi-stage telescopic boom A includes a base boom 1 and an intermediate boom. 2 and a front end boom 3, and each of the booms 1 to 3 is configured to be fitted and inserted in a stretchable manner. The mounting portion 1a on the base end side of the base boom 1 is provided with a post (not shown) provided on a turntable of an aerial work vehicle.
And one end is connected to the other end of a cylinder device (not shown) having one end attached to the post,
The elevation angle of the base boom 1 (and, consequently, the extension boom A) is changed by the extension / contraction operation of the cylinder device.
The tip of the tip boom 3 has a hook 3 to be described later.
1 is provided. Each of the booms 1 to 3 is telescopically expanded and contracted by a telescopic device such as a fluid pressure cylinder (not shown).

Further, reference numeral 4 denotes a first sheave provided at the distal end of the base boom 1, reference numeral 5 denotes a second sheave provided at the base end of the intermediate boom 2, and reference numeral 6 denotes a distal end (support) of the distal boom 3. The third sheave 7 provided in the section 3a) is a cable as a linear object. The cable 7 first passes through the outside of the base boom 1 from the turntable side of the aerial work vehicle, and then passes through the third sheave. After being wound around the first sheave 4, the second sheave 5 passes between the base boom 1 and the intermediate boom 2.
And finally wound around the third sheave 6 from the outside of the intermediate boom 2 and the tip boom 3 to extend to the tip of the tip boom 3. Reference numeral 8 denotes a telescopic cylinder that expands and contracts the telescopic boom A. The telescopic cylinder 8 has a base end at which the mounting part 1a of the base boom 1 is attached.
The distal end portions are attached to the support portions 3a of the distal end boom 3, respectively. Reference numeral 9 denotes rollers provided near the distal end of the base boom 1 and at the distal end of the intermediate boom 2.

As a feature of the present invention, as shown in FIGS. 1 and 4, each of the booms 1, 2, and 3 is formed in an octagonal cross-section obtained by chamfering four corners of a cylindrical body having a rectangular cross-section. . Further, a pair of receiving members 11, 11 are provided at left and right symmetrical positions at the lower part on the inner side of the distal end of the base boom 1. Each receiving member 11 has a lower inclined surface 2 with a lower part standing upright and chamfered at a lower part of the intermediate boom 2.
a, 2a (lower surface), a first receiving member 12 having an upper portion inclined outward so as to face the inside of the lower member, and a base end side of the first receiving member 12 in the boom extension direction. A second receiving portion constituting member 13 provided so as to form an extended closed cross section, formed in a shape conforming to the inside of the lower inclined surfaces 1a, 1a chamfered at the lower portion of the base boom 1; A flat third receiving member 1 provided on the distal end side of the receiving member 12 and extending below the second receiving member 13 along the side walls 1b of the base boom 1.
4 are connected to each other, and each receiving member 11 arranged in the facing direction is connected to the lower end of the upright surfaces 12a, 12a of the opposing first receiving portion constituting member 12 at the lower portion thereof. It is integrally formed via a connecting member).

In the upper part of each receiving member 11,
Synthetic resin pads 16 are attached to the inclined surfaces 12b, 12b of the first receiving member 12 which incline outward from the upper end of the upright surface 12a, and intermediate booms corresponding to the inclined surfaces 12b are provided. 2 has a lower inclined surface 2a.
Obliquely slidably through and substantially perpendicular to the sliding direction
It is supported immovably from the lateral direction . In addition, the inclined surface 12 of the first receiving portion constituting member 12 in each of the receiving members 11
b In a lower space below, that is, an empty space between the first receiving member 12 and the second receiving member 13, the cable 7 passing between the base boom 1 and the intermediate boom 2 is provided. It is slidably arranged.

Reference numeral 21 in FIG. 1 denotes a pad attached to the inside of the tip of the upper inclined surfaces 1c, 1c chamfered on the upper part of the base boom 1. In addition, the reference numeral 22 in FIG.
Upper inclined surface 2 chamfered at the upper part of the middle boom 2
b, 2b, between the inside of the tip of the upper inclined surface 3a chamfered at the upper part of the tip boom 3, and the inside of the lower inclined surfaces 2a, 2a and the lower inclined surface 3b chamfered at the lower part of the tip boom 3. Pads respectively attached to the outside of the tip.

Therefore, in the above embodiment, each boom 1
3 are formed in an octagonal cross-section, and a pair of right and left receiving members 11 in which the lower inclined surface 2a of the intermediate boom 2 having such a cross-sectional shape is inclined outward so as to face the lower inclined surface 2a. To the inclined surface 12b of the first receiving portion constituting member 12 through the pad 16 so as to be slidable and obliquely laterally.
Because it is immovably supported, the lower inclined surface 2a of the intermediate boom 2, the lower inclined surface of the first receiving part components 12 12
a, it is supported obliquely from the lateral direction via the pad 16
The intermediate boom 2 when the multi-stage telescopic boom A is extended.
Lateral movement is reliably prevented. Moreover, the cable 7
Since it is arranged in an empty space formed between the first receiving member 12 and the second receiving member 13 whose upper part is inclined outward, that is, in the closed cross section of the receiving member 11, The cable 7 passing between the inside of the base boom 1 and the outside of the intermediate boom 2 slides in the closed cross section of the receiving member 11 with the extension of the multistage telescopic boom A, and slides the cable 7. There is no need to separately provide an insertion hole required for moving the receiving member 11 by a separate operation.

As a result, it is possible to easily arrange the cable 7 that can slide along with the extension of the multi-stage telescopic boom while reliably preventing the intermediate boom 2 from laterally moving when the multi-stage telescopic boom A is extended. it can.

Further, in the above embodiment, the upright surfaces 12a, 12a of the first receiving portion constituting member 12 between the receiving members 11 are provided.
Since the spacers 15 are integrally formed by the spacers 15 that connect the a to each other, by using spacers having different widths between the receiving members 11, the width between the receiving members 11 increases or decreases. The receiving member 11 can be diverted to the telescopic boom, and the receiving member 11 can be shared.

Each receiving member 11 has a lower part
Upright surfaces 12a, 12 of opposed first receiving member 12
a are integrally formed via a spacer 15 connecting the
So that each receiving member 11 is located below the inside of the tip of the base boom 1.
Easy positioning when installing in symmetrical positions in the part
And the inclination of the first receiving member 12
Intermediate blocks acting on the surfaces 12b, 12b via the pads 16
Each receiving member 11 may be deformed by the load from the
Is effectively prevented and the intermediate boom 2 is securely supported.
be able to.

It should be noted that the present invention is not limited to the above embodiment, but includes various other modifications.
For example, in the above embodiment, the multi-stage telescopic boom A in which the cable 7 extends to the support portion 3a at the tip of the tip boom 3 has been described, but as shown in FIGS. 5 and 6, the cable 7 is attached to the support portion 3a. The present invention is applicable to a multi-stage telescopic boom A 'having a hook parallel moving device (not shown) for moving the hook 31 in parallel regardless of the expansion and contraction of each of the booms 1 to 3. Of course it is good. In the drawing, reference numeral 32 denotes a winch drum for winding or rewinding the cable 7.

In the above embodiment, the receiving members 11, 11
Is formed by joining the first receiving member 12, the second receiving member 13, and the third receiving member 14,
Each receiving member may be constituted only by the first receiving portion constituting member of the above embodiment.

Further, in the above embodiment, each of the booms 1 to 3
The cross-sectional shape of each boom was formed in an octagonal cross-section, but the cross-sectional shape of each boom may be a polygonal shape, even if it is a boom in which the sides adjacent to each other are inclined even in a rectangular cross-section. good. Further, in the above embodiment, the cable 7 is used as a linear object, but a linear object such as a hydraulic pipe may be used.

Moreover, in the above embodiment, each receiving member 11
Upright surface of the first receiving member 12 facing the lower part
The lower ends of 12a, 12a are connected by a spacer 15
However, the spacers face each other at the lower part of each receiving member.
Any part of the upright surface, e.g.
1, the upper ends of the upright surfaces of the receiving portion constituting members, that is, the upright
Lower end of inclined surface 12b inclined outward from upper end of surface 12a
(Inner ends) are connected by spacers and left and right receiving members
May be integrally configured.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of the inside of a multistage telescopic boom according to an embodiment as viewed from a distal end side.

FIG. 2 is a side view on the tip side of the multistage telescopic boom according to the embodiment.

FIG. 3 is a side view of the multistage telescopic boom according to the embodiment.

FIG. 4 is an exploded perspective view of a receiving member according to the embodiment.

FIG. 5 is a side view of a multi-stage telescopic boom according to a modified example at the time of contraction.

FIG. 6 is a side view at the time of extension according to FIG. 5;

[Explanation of symbols]

 A, A 'Multi-stage telescopic boom 1 Base boom 2 Intermediate boom 2a Lower inclined surface (lower surface) 3 Tip boom 5 Second sheave 7 Cable (linear object) 11 Receiving member 12a Upright surface 12b Inclined surface 15 Spacer (connection) Materials) 16 pads

Claims (1)

(57) [Scope of request for utility model registration] 1. A base boom, an intermediate boom, and a tip boom are sequentially fitted and inserted in a stretchable manner, a sheave is provided at a base end of the intermediate boom, and a linear object such as a hydraulic pipe or a cable is connected to the base boom. And between the intermediate boom and wound around the sheave, the multi-stage telescopic boom extended to the tip of the tip boom, each boom is formed in a polygonal cross section, the base boom A pair of right and left receiving members, each having a lower portion standing upright and an upper portion inclined outward so as to face the lower surface of the intermediate boom, are provided at the lower portion on the inner side of the tip. Are arranged so as to be integrally formed via a connecting member that connects the lower and upper surfaces of the receiving members, and the lower surface of the intermediate boom corresponding to the inclined surface is slidably and slidably. That sliding
With the Rupa Tsu <br/> de be immovably supported in an oblique transverse direction toward and substantially perpendicular are mounted, it said linear material in the lower space in the inclined surface below the respective receiving material is slidably A multi-stage telescopic boom having a polygonal cross section, wherein the telescopic boom has a polygonal cross section.