JP3388997B2 - Work boom line member arrangement mechanism - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a line member for a working boom having a line member such as a hose and a cable connected to a working device provided at the end of the boom. Related to the installation mechanism. 2. Description of the Related Art In an aerial work vehicle provided with a worktable at the tip of a boom that can be freely raised and lowered, the worktable is always kept at the tip of the boom in order to keep the worktable horizontal regardless of the boom angle. A vertical post for maintaining a vertical state is provided, and a work table is attached to the vertical post. An operating device for raising and lowering the boom is provided on the workbench, and a hose, a cable, and the like extending from the operating device pass through a hollow boom and are disposed below the boom. Connect to the device. [0003] Here, the above-mentioned hose is provided at the tip of the boom as shown in FIGS. 5 to 8.
First, the attachment of the vertical post 14 to the boom 13 will be described. At the tip of the boom 13, an opening 1
A boom head 18 is attached so as to cover the periphery of 3d, and the boom head 18 has a side plate 18
a, 18b, and is formed in a U-shape.
The middle portion of the vertical post 14 is pivotally supported by the head pin 14a so as to be swingable in the front-rear direction. The lower end of the vertical post 14 has a boom 13
The rod-side end of the leveling cylinder 17 disposed therein is pivotally supported, and the vertical post 14 swings by the expansion and contraction operation of the leveling cylinder 17. Here, when the boom 13 is in the raised state as shown in FIG.
Lower end 14d of vertical post 14 from boom head 18
The protrusion amount of the lower end portion 14d is large when the protruding amount of the lower end portion 14d is small, and the protruding amount of the lower end portion 14d is large as shown in FIG. Next, the arrangement of the hose 51 will be described. The hose 51 extending in the internal space of the boom 13
Is moved out of the boom 13 from the opening 13d through a gap 18c between the inner side surface of the left side plate 18a and the left side surface (outer side surface) 14b of the vertical post 14, and then engaged with the lower surface of the arm 15 by the locking member 22. Is stopped. Note that the arm 15 is configured to be horizontally pivotable with respect to the vertical post 14, and a work table (not shown) is provided at the tip of the arm 15, and the hose 51 extends to the work table. [0006] The hose 51 provided in this manner is formed to have a length such that the hose 51 is not pulled even when the boom 13 is laid down. Therefore, boom 1
In a state in which the hose 3 is raised, the slack of the hose 51 is increased from the position where the gap 18c is exited to the position where the locking member 22 is provided. [0007] Here, when the arm 15 is turned while the boom 13 is raised (a state in which the hose 51 is greatly loosened), the loosened portion of the hose 51 is moved to the lower end portion 14d. And the other side of the vertical post 14 (right side)
May be moved to If the boom 13 is turned down in this state, the hose 51 may enter the gap 18d opposite to the gap 18c from which the hose 51 has come out. Is raised, the hose 51 is sandwiched between the inside of the right side plate 18b and the right side surface 14c of the vertical post 14,
The hose 51 may be damaged. Further, even if the hose 51 does not pass through the lower end portion 14d, it is located in the vicinity of the lower end portion 14d.
As shown in FIG. 8, when the boom 13 is moved down, the lower end 14d protrudes and the hose 51 is caught, so that the hose 51 is pulled.
1 may be damaged. Further, regardless of whether the hose 51 has passed through the lower end portion 14d or not, the slack of the hose 51 is reduced as shown in FIG. When the arm 15 is turned, the hose 51 is twisted and kinks are liable to occur, and there is a possibility that the hose 51 may be adversely affected. SUMMARY OF THE INVENTION The present invention has been made in view of such a problem, and a work boom provided with a working device on a swinging member such as a vertical post provided at the tip of a boom that can be raised and lowered is provided. Even if the boom is raised and lowered, the line member such as a hose disposed on the working device from the boom is not damaged, and the line member arrangement mechanism of the work boom that the line member follows without difficulty is provided. It is intended to provide. [0011] In order to achieve the above object, a work boom linear member disposing mechanism according to the present invention comprises:
A linear form such as a hose or a cable extending from the working device to the boom member in the working boom in which the working device is attached to a swing member pivotally supported by a pivot pin in an inner space at a tip end portion of the boom member. This is an arrangement mechanism for disposing members. In this disposing mechanism, at least one round linear member is wound around the outer periphery of the pivot pin in a gap formed between the outer surface of the swinging member and the inner surface of the boom member. The swing member is swingable in a state where the line-shaped member is wound around the outer periphery of the pivot pin, and the dimension is such that the line-shaped member can be loosely arranged. Here, in order to smoothly swing the swinging member and not to damage the line-shaped member, the line-shaped member between the boom member and the working device must be loosened (played).
However, according to the linear member arranging mechanism of the working boom configured as described above, the pivot pin around which the linear member is hung is the swing center of the swing member. Therefore, the play of the linear member can be reduced. Preferred embodiments of the present invention will be described below with reference to the drawings. First, an aerial work vehicle having a work boom line member disposing mechanism according to the present invention will be described with reference to FIG. The aerial work vehicle has a swivel table 12 that can freely turn on a vehicle body 11, and a telescopic boom 13 is attached to the swivel table 12 so as to be able to move up and down. The telescopic boom 13 is formed in a hollow and telescopic (nested) telescopic base boom 13a, intermediate boom 13b and distal boom 13.
The base end boom 13a is pivotally supported on the swivel base 12 so as to be able to move up and down. A vertical post (swinging member) 14 is attached to the tip of the tip boom 13c via a boom head 18. The vertical post 14 is always maintained vertically by a leveling cylinder 17 which expands and contracts in response to the raising and lowering operation of the boom 13. At the upper end of the vertical post 14, an arm 15 extending in the horizontal direction and distant in the horizontal direction is attached so as to be freely rotatable horizontally. At the tip of the arm 15, a worktable 16 is attached via a worktable bracket 16a. The work table 16 is configured so that an operator can board the work table. The work table 16 is moved to an arbitrary work position through a swiveling operation of the swivel table 12, an up-and-down operation of the boom 13, an expansion and contraction operation, or a swiveling operation of the arm 15, thereby performing high-altitude work. It can be carried out. These operations are performed by driving a hydraulic actuator such as a hydraulic cylinder or a hydraulic motor. Control of the driving is performed by an operator operating an operation device 19 attached to the work table 16. The hydraulic oil supplied to each hydraulic actuator is supplied from a hydraulic pump (not shown) disposed on the vehicle body 11, and the supply and discharge of the hydraulic oil are performed by an oil supply hose (line). ). This hose 2
1 is disposed extending from the vehicle body 11 inside the boom 13, protrudes from an opening 13 d (see FIG. 1) of the tip boom 13 c, passes through the inside of the arm 15, and is connected to the operating device 19. Here, in addition to FIG. 1, the operating device 1 corresponding to the working device described in the claims from the tip boom 13c.
The arrangement of the oil supply hose 21 to the hydraulic actuator 9 and the hydraulic actuator will be described. The attachment of the vertical post 14 to the tip boom 13c is the same as that described in the above-mentioned “Prior Art” (the boom 13 corresponds to the tip boom 13c). Omitted. A hose 21 connected to the operating device 19 and the like extends from the tip boom 13c to which the vertical post 14 is attached as described above.
After making a round around the outer periphery of the head pin (pivot pin) 14a, a through hole 14e penetrating in the front-rear direction near the center of the vertical post 14 is formed on the rear side (the upper surface side of the boom 13).
From the front side. The gap 18c allows the hose 21 to be gently disposed (moved freely) in a state where the outer circumference of the head pin 14a is made to go around the circumference, and a dimension that does not hinder the swinging motion of the vertical post 14. Is formed. Then, after being locked and held by the locking member 22 on the lower surface of the arm 15, the arm 15 enters the inside of the arm 15 through an opening (not shown) opened on the lower surface of the arm 15, and the turning operation of the arm 15 is performed. It is connected to a swing motor to be performed, or passes through the inside of the arm 15, goes out of the opening on the side of the worktable 16, and is connected to the operation device 19. By arranging the hose 21 in this manner, the lower end 14d of the vertical post 14 does not loosen when the boom 13 is raised as shown in FIG. Further, since the hose 21 does not move to the front of the lower end portion 14d or move to the opposite side through the lower end portion 14d even when the arm 15 is turned, the boom 13 is moved as shown in FIG. In this state, the hose 21 is not pulled or caught between the vertical post 14 and the boom head 18. Further, even when the boom 13 is in the down state, the hose 21 has play, so that even if the arm 15 is turned, no kink occurs in the hose 21. In the above embodiment of the present invention, only one hose 21 is shown for convenience of explanation, but a plurality of hoses may be used. In this case, the hose may be provided around the circumference of the head pin 14a.
Here, the hose having at least one circumference around the outer circumference of the head pin 14a does not necessarily need to be disposed toward the work table 16 after penetrating the vertical post 14, and is directly passed through the gaps 18c and 18d without passing through the through hole 14e. Arm 15
It may be arranged toward. Further, in the above-described embodiment, the case where the hose is provided as an example of the linear member has been described. However, the linear member having another configuration such as an electric wire or an optical fiber cable may be used. Good. Further, the arm 15 is not always necessary, and the work table 16 or the work table bracket 1 is directly attached to the vertical post 14.
Of course, it can also be used for a work boom provided with 6a. According to the mechanism for disposing the linear member of the work boom as described above, the linear member such as the oil supply hose can be used.
It is wrapped around the outer periphery of a head pin, which is the swing center of a swing member such as a vertical post. For this reason, the line-shaped member can easily follow the boom when the up-and-down operation, that is, the swinging movement of the swinging member is performed, and the play of the line-shaped member for improving the followability is reduced. be able to. Therefore, the line-shaped member does not get caught on the swinging member or is caught between the swinging member and the boom when the swinging member is operated.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a linear member arranging mechanism of a working boom according to the present invention. FIG. 2 is a side view of an aerial work vehicle equipped with a line-shaped member arranging mechanism for the work boom. FIG. 3 is an enlarged view of a boom tip in a state in which the boom is raised. FIG. 4 is an enlarged view of a tip end portion of the boom in a state where the boom is lying down. FIG. 5 is a perspective view of a tip end portion of a boom showing an arrangement state of a conventional linear member. FIG. 6 is an enlarged view of a state in which the boom is lying down. FIG. 7 is an enlarged view of a state in which the boom is raised. FIG. 8 is an enlarged view of the boom in the down state. [Description of Signs] 13 Boom 14 Vertical Post (Swinging Member) 15 Arm 16 Worktable 18 Boom Head 21, 51 Hose (Linear Member)

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B66F 9/06 B66F 9/08

Claims (1)

(57) [Claim 1] A boom member formed in a hollow, and a pivot pin is pivotally supported by a pivot pin in an inner space at a distal end portion of the boom member. A swinging member, a working device located outside the boom member and attached to the swinging member, and a hose and a cable arranged so that one end extends to the working device and the other end extends to the boom member. In a working boom comprising a linear member such as the above, the linear member at least on the outer periphery of the pivot pin in a gap formed between the outer surface of the swing member and the inner surface of the boom member. The swing member can be swung in a state where the dimension of the gap is wound around the circumference of the pivot pin, and the line member can be gently disposed. Size Working boom of the linear member disposed mechanism, characterized in that.