JPH0798465B2 - Work vehicle with workbench - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention mounts a swivel base on a traveling base so that the swivel base is rotatable.
The present invention relates to a work vehicle including a work platform, which is a work vehicle including a boom having a base end portion rotatably supported on the swivel base.

(Prior Art) As a work vehicle equipped with this work table, the technique described in Japanese Utility Model Laid-Open No. 49-69731 is known.

As shown in FIG. 3, this technique is such that a swivel is mounted on a traveling base so that the swivel can be swiveled, and the swivel is provided with a boom that pivotally supports the base end of the swivel so that the boom can extend and contract. The middle portion of the support column is tiltably supported, and a workbench is arranged at the telescopic end of the telescopic column so that the workbench can be moved up and down by the telescopic motion of the telescopic column.

(Problems to be Solved by the Invention) However, in the work vehicle provided with the work platform described above, the load loaded on the work platform causes a force in the direction of overturning the work vehicle. There is a problem that the load that can be loaded on top is significantly limited.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to remarkably enhance the load carrying capacity on a workbench in a work vehicle equipped with a workbench.

(Means for Solving Problems) As means for solving the above problems, the present invention mounts a swivel on a traveling base so that the swivel is freely rotatable, and a base end portion of the swivel is freely undulated. In a work vehicle having a pivotally supported boom, a work of attaching a guide column whose lower end is installed on the ground via a ground plate to the tip of the boom and moving up and down along the guide column to the guide column. A table is provided, and the swivel table or the guide column is provided with an elevating means for elevating the work table along the guide column.

(Operation) With this configuration, in the present invention, the workbench can be freely raised or lowered along the guide column by driving the elevating means. In addition, the load loaded on the workbench and the weight of the workbench are transmitted to the ground via the guide columns.

(Example) Next, this invention is demonstrated in detail based on 1 concrete implementation.

FIG. 1 is a side view of a work vehicle equipped with a workbench when a mobile crane is used as the work vehicle. In FIG. 1, reference numeral 1 is a traveling base, and 2 is an outrigger device which is located at the front and rear positions of the traveling base 1 and carries the traveling base 1 in place of tires during work. Reference numeral 3 denotes a swivel base mounted on the traveling base 1 so as to freely swivel. Reference numeral 4 denotes a multi-stage telescopic boom whose base end is pivotally supported on the swivel base 3. 5 is swivel base 3
A first winch (corresponding to an elevating means in the claims) arranged above, and a second winch 6 arranged on the swivel base 3 in parallel with the first winch. The rope unreeled from the first winch 5 suspends a main hook (not shown) from the tip of the multi-stage telescopic boom 4 during crane work. In this embodiment, a workbench described later is used. I'm hanging. The rope unwound from the second winch 6 suspends a sub-hook (not shown) from the tip of the add-on boom (not shown) that is added to the tip of the multi-stage telescopic boom 4 during crane work. However, in this embodiment, it is used for loading a load on a workbench, which will be described later, after passing through a pulley provided at an upper end portion of a guide column, which will be described later. A pair of pin insertion portions 7 are arranged on the lateral side of the tip of the multi-stage telescopic boom 4 and are vertically separated from each other, and at the time of crane work, the base end portion of the boom to which the joint is added is added to these pin insertion portions. Be pivoted. Reference numeral 8 denotes a guide strut support portion, the base end portion of which is formed to be pivotally attached to the pin insertion portion 7 via a pin 9, and the tip end portion thereof pivotally supports a guide strut A described later. Is formed. Reference numeral A denotes a guide strut, which is formed of three cylinders, an outer cylinder 10, an intermediate inner cylinder 11, and an innermost cylinder 12, and the intermediate inner cylinder 11 is inside the outer cylinder 10 and the innermost cylinder 12 is inside the intermediate inner cylinder 11.
Are located respectively. A hydraulic cylinder (not shown) is internally provided between the cylinders, and the guide column A is expanded and contracted by the expansion and contraction of the hydraulic cylinder. Reference numeral 13 is a ground plate which is swingably arranged at the lower end of the innermost cylinder 12. Reference numeral 14 is the outer cylinder of the guide support 8 and the guide support A.
It is a hydraulic cylinder whose both ends are pivotally supported between 10 and the mounting angle of the guide strut A with respect to the multi-stage telescopic boom 4 can be freely changed in association with the expansion and contraction movement of the hydraulic cylinder 14. Reference numeral 15 denotes a pulley (corresponding to a rope guide tool in the claims) arranged at the upper end of the outer cylinder 10 of the guide column A.

Reference numeral B denotes a triple guide cylinder arranged in a pair on the left and right along the guide column A, and a first guide 16 whose upper end and lower end are fixed to the upper end and lower end of the outer cylinder 10, respectively. A second guide 17 in which the lower end of the second guide 17 is slidably fitted into the intermediate inner cylinder 11 and fixed to the lower end of the intermediate inner cylinder 11.
The third guide 18 is slidably inserted into the inside 17 and has its lower end fixed to the lower end of the innermost cylinder 12. Therefore, the triple guide cylinder B expands and contracts in conjunction with the expansion and contraction of the guide column A. C is a workbench, and this workbench C has guide pipes 16, 1 forming the triple guide cylinder B on its back surface.
Relative movement restriction part with recess 19 'that slides along 7,18
It has a pair of left and right 19. Further, the workbench C is provided with a rope fastening portion 21 for fastening the rope 20 which is repeated from the first winch 5 and hangs down via the pulley 15.

Next, the operation of this product will be described.

First, the guide strut support 8 is attached to the tip of the multi-stage telescopic boom 4 together with the guide strut A from which the workbench C has been removed, via the pin 9. Next, the multi-stage telescopic boom 4 is telescopically or undulated to move the guide column A to a desired work position. At this time, the rope 20 paid out from the first winch 5 is fixed to a proper position of the innermost cylinder 12 of the guide strut A after passing the pulley 15. Next, the hydraulic cylinder 14 and the guide strut A are driven to position the guide strut A in the vertical posture and the ground plate 13 is grounded. The first winch 5 is driven in the unwinding direction of the rope 20 in association with the extension of the guide column A. Then workbench C
The concave portion 19 ′ of the above is brought into contact with the lower end of the third guide 18, and the rope 20 is fixed to the rope fixing portion 21 of the workbench C. If the first winch 5 is driven and the rope 20 is wound up and driven from this state, the workbench C is guided by the triple guide cylinder B and ascends along the guide column A. When the workbench C moves up and down along the guide strut A or when the workbench C is held at an arbitrary position on the guide strut A, the guide strut A loads the workbench C on the pulley 15 and the guide strut A. To the ground via. Therefore, the load of the workbench C does not act on the tip portion of the multi-stage telescopic boom 4, so that the workbench C can be made into a large size so that several workers can board at the same time. Further, the rope unwound from the second winch 6 is provided on the floor surface of the work table C via a pulley (not shown) provided so as to project from the upper end portion of the guide column A to a position directly above the work table C. By hanging down to the ground through the openable / closable opening, it is possible to use the second winch 6 to load a work onto the workbench C.

Further, when a coating nozzle is attached to an appropriate place on the workbench C and the workbench C is vertically moved up and down along the wall surface of the building, even when painting this wall surface, the heavy load of any painting equipment such as a compressor for painting is directly applied. It can be placed on the workbench, and a door on the front side of the workbench C (the side opposite to the relative movement restricting portion 19) is provided, and the workbench C is brought close to the window of the building, and this door is opened to open the building. It is also possible to load a work onto the workbench C from the window.

In the above embodiment, since the guide strut A is formed of the outer cylinder 10, the intermediate inner cylinder 11, and the innermost cylinder 12, the total length of the guide strut A can be shortened when the guide strut A is fully contracted. When the crane is traveling, the guide pillar A may be folded under the lower surface of the multi-stage telescopic boom 4 which is collapsed and collapsed, and the innermost cylinder 12 may be provided on the traveling base 1. Needless to say, the guide column A may be a non-expandable type.

Further, in the above embodiments, the first winch is used as the raising and lowering means for raising and lowering the workbench, but a hydraulic cylinder may be arranged on the guide column and the workbench may be raised and lowered by expanding and contracting the hydraulic cylinder. At this time, as a driving source for driving the hydraulic cylinder, a pump provided in the mobile crane may be used for both the hydraulic cylinder and the hydraulic cylinder 14 internally provided in the guide column A.

(Effect of the Invention) The present invention has an effect that the allowable load of the workbench can be remarkably increased as compared with the conventional load.

[Brief description of drawings]

FIG. 1 is a side view of a work vehicle equipped with a workbench showing an embodiment of the present invention, FIG. 2 is a view taken in the direction of arrow H in FIG. 1, and FIG. 3 is a side view of a conventional example. 1; traveling base, 3; swivel base, 4; boom, 5; first winch drum, 20; rope, 15; pulley (rope guide tool), C; work platform

Claims (1)

[Claims] 1. A revolving base is mounted on a traveling base so as to be freely rotatable,
In a working vehicle including a boom, the base end of which is rotatably supported on the swivel base, a guide column whose lower end is installed on the ground via a ground plate is attached to the tip of the boom. A work platform is provided on the guide column, and the work platform is arranged to move up and down along the guide column. The swivel base or the guide column is provided with a work platform including an elevating means for moving the work platform up and down along the guide column. Work vehicle.