JPH078089U - Construction vehicle step equipment - Google Patents

Abstract

(57) [Summary] [Purpose] Make it easier to get on and off the cabin of a construction vehicle. [Structure] In the mobile crane 1, the step device 11 is composed of an upper step 12 and a lower step 13, and these steps 12 and 13 are stepped between the main members 12a and 13a which are arranged left and right separately. The members 12b and 13b are attached, the upper end of the upper step 12 is pivotally supported on the vehicle body 2, and the upper step 12 is attached to the lower step 1.
3 is slidably held so that it can be retracted to and from the lower end side of the upper step, and the vehicle body 2 and the lower step 13 are connected by a swingable link 14, so that the lower step 13 By the protrusion, the step device 11 is projected toward the outside of the vehicle around the pivot 15 to the vehicle body 2 of the upper step 12.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a step device used for getting on and off a construction vehicle.

[0002]

[Prior art]

 In a construction vehicle, a swivel is placed on the lower traveling structure that is configured to be self-propelled, and a cabin on which an operator rides is installed on the swivel, so the cabin position is set higher than the road surface. Has been done.

Therefore, conventionally, in a construction vehicle, a ladder is vertically fixed to a side surface of a vehicle frame of a lower traveling body of the construction vehicle for the convenience of an operator getting on and off the cabin.

[0004]

[Problems to be solved by the device]

 However, in the conventional ladder of this type, the operator has to get on and off the cabin while using both hands, and the riding posture is not good.

Further, since a construction vehicle of this type is generally driven by a hydraulic device, if oil or the like adheres to the ladder, it is necessary to get on and off the vehicle more carefully.

The present invention has been made under such circumstances, and an object thereof is to make it easy to get on and off a cabin of a construction vehicle.

[0007]

[Means for Solving the Problems]

 In order to achieve this object, the invention according to claim 1 is a construction vehicle in which a swivel base is arranged on a lower traveling body configured to be self-propelled, and a cabin on which an operator rides is installed on the swivel base. In the above, the step device is composed of an upper step and a lower step, and the upper step and the lower step are formed by connecting the upper step and the lower step in a bridge shape between the main members which are arranged separately on the left and right sides. The upper end of the upper step is pivotally supported by the lower traveling body of the construction vehicle, and the lower step is slidably held by the upper step so that the upper step can be retracted to and from the lower end side of the upper step. The traveling body and the lower step are connected by a swingable link, and the lower step of the lower step causes the lower step of the upper step to move the step device. And wherein the projecting outwardly of the vehicle at pivot point around to.

[0008]

[Action]

 According to the first aspect of the present invention, when the step device is used, when the lower step is projected downward, the entire step projects to the outside of the vehicle and is close to the stairs. It will be easier to do.

Since such a step device is projected to the outside of the vehicle in conjunction with the downward projection of the lower step, there is an advantage that the operation is not complicated.

In addition, since the step device is stored along the vehicle and the lower step is immersed in the upper step when not in use, there is no overhang to the outside of the vehicle when the construction vehicle travels, and there is no load clearance. Since it can be secured sufficiently, no trouble will occur.

[0011]

【Example】

 The present invention will be described below with reference to an embodiment applied to a mobile crane.

First, referring to FIG. 2, the general outline of the crane vehicle will be described. 1 is a crane vehicle, 2 is a vehicle body as a lower traveling body, and 3 is an upper swing body.

The vehicle body 2 is configured to be self-propelled, and an upper revolving structure 3 is rotatably mounted on the vehicle body 2 via a revolving base 4.

The upper swing body 3 is provided with a telescopic boom 5, a telescopic and undulating drive device for the telescopic boom, and a winch device 6, and a cabin 7 for an operator to perform these operations and a driving operation as a vehicle. ing.

A step device 11 according to the present invention is installed at a position on the vehicle body 2 just below the cabin 7.

As shown in FIGS. 1 and 3, the step device 11 has an upper step 12, a lower step 13, and a swingable link 14.

Each of the upper step 12 and the lower step 13 is configured by installing step members 12b and 13b in a bridge shape between main members 12a and 13a that are installed on both left and right sides and extend in the vertical direction.

The main member 12a installed on both sides of the upper step 12 is formed of a square pipe material, and the upper end of the main member 12a is pivotally supported on the vehicle body 2 via a pivot 15 installed horizontally. Each main member 13a of the lower step 13 is slidably held in the main member 12a of the upper step 12 so as to be retractable from the lower end thereof.

In addition, the step member 13b of the lower step 13 has two end portions of the step member 13b on the body 2 side surface of the main member 13a of the lower step 13 so as to avoid the position of the step member 12b of the upper step 12. The upper step 12 and the lower step 13 can be expanded and contracted as shown in FIGS. 1 and 3 because they are connected via a slit 12c described later.

The slits 12c are formed in the main members 12a on both sides of the upper step 12 and allow the step members 13b of the lower step 13 and a bracket 13c described later to move back and forth.

In each of the main members 13a on both sides of the lower step 13, a bracket 13c is installed on the surface of each main member 13a facing the vehicle body 2 side, and a guide roller 13d is provided at the tip of each main member 13a. In addition to being installed and smoothing the expansion / contraction operation, stoppers 16 projecting outward are installed at the lower ends of the main members 13a.

The stopper 16 prevents the lower step 13 from being excessively accommodated in the upper step 12.

Further, a tip end of a swingable link 14 pivotally supported by the vehicle body 2 is pivotally supported by the bracket 13c.

The link 14 is axially supported by the vehicle body 2 via a shaft 17, and the link 14 and the driven gear 18 are integrally formed on the shaft 17.

A driven gear 19 driven by an electric motor is meshed with the driven gear 18.

In the step device 11 configured as described above, by driving the driving gear 19, the link 14 swings through the driven gear 18, whereby the lower step 13 is driven forward and backward, It emerges from the lower end of the upper step 12.

With the operation of the link 14, the upper step 12 to which the lower step 13 is fitted is driven to swing around the pivot 15, and the projecting operation of the lower step 13 causes the upper step 12 to project. , It is stored in the storage position along the vehicle body 2 with the immersion operation.

Next, a second embodiment will be described with reference to FIG. 4. In the second embodiment, the hydraulic cylinder 31 is expanded and contracted without using the driving gear 19 and the driven gear 18 by the electric motor of the first embodiment. Is used to drive the lower step 13 and the like, and the other points are the same as in the first embodiment.

That is, in the second embodiment, the hydraulic cylinder 31 is installed across the pivot 15 in the main member 12a of the upper step 12 and the main member 13a of the lower step 13.

When the hydraulic cylinder 31 extends, as shown in FIG. 4, the lower step 13 projects from the lower end of the upper step 12 and the link 14 is driven to swing, so that the outer step of the vehicle body 2 is prevented. When the step device 11 overhangs and contracts, the lower step 13 is accommodated in the upper step 12, and at the same time, the link 14 is swung upward to reduce the overhang, and finally the vehicle body according to FIG. It will be in the storage state according to 2.

Next, a third embodiment will be described with reference to FIG. 5. In the third embodiment, the main member 13a of the lower step 13 is fitted on the outside of the main member 12a of the upper step 12, Further, it differs from each of the above-described embodiments in that the lower step 13 is configured to be expanded and contracted manually.

Therefore, in the third embodiment, since the driving gear 19 of the first embodiment and the hydraulic cylinder 31 of the second embodiment are not provided at all, the stopper device 32 is provided and the step device is provided. 11 can be held in the storage position along the vehicle body 2.

The stopper device 32 is composed of a locking portion 33 fixed to the upper step 12 and a catcher portion 34 fixed to the vehicle body 2. The catcher portion 34 is a coil spring 34a that projects the steel ball 34b in the protruding direction. The steel ball 34b holds the locking portion 33 by sandwiching it (see FIG. 6).

Therefore, in the third embodiment, if necessary, the lower step 13 is manually pulled out or retracted downward, whereby the link 14 swings similarly to the above, and the stopper device 32 is moved. While being attached or detached, the step device 11 can be installed so as to project, or can be stored along the vehicle body 2, and the same effect as described above can be obtained.

[0035]

[Effect of device]

 As described above, according to the first aspect of the invention, when the step device is used, when the lower step is projected downward, the entire step is projected to the outside of the vehicle, and the step is close to the stairs. Therefore, getting on and off the cabin is easier than before.

Since such a step device is projected to the outside of the vehicle in conjunction with the downward projection of the lower step, there is an advantage that the operation is not complicated.

Moreover, when not in use, the step device is stored along with the vehicle, and the lower step is immersed in the upper step. Therefore, when the construction vehicle travels, there is no overhang to the outside of the vehicle, and there is no load clearance. Since it can be secured sufficiently, no trouble will occur.

[Brief description of drawings]

1 is a cross-sectional view taken along the line AA of FIG.

FIG. 2 is an overall schematic view of a mobile crane equipped with the step device of the first embodiment.

FIG. 3 is a sectional view of the first embodiment in a stored state.

FIG. 4 is a sectional view of a second embodiment in an overhanging state.

FIG. 5 is a sectional view of a third embodiment in an overhanging state.

FIG. 6 is a partial cross-sectional view of a stopper device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Crane vehicle (construction vehicle) 2 Vehicle body (lower traveling body) 4 Revolving platform 11 Step device 12 Upper step 12a, 13a Main member 12b, 13b Step member 13 Lower step 14 Link 15 Axis

Claims (1)

[Scope of utility model registration request] 1. A construction vehicle in which a swivel base is arranged on a lower traveling body configured to be self-propelled, and a cabin on which an operator rides is installed on the swivel base, and a step device is provided for the upper step and the lower step. The upper step and the lower step are formed to be expandable and contractable, and a step member is attached in a bridge shape between the main members arranged to be separated from each other on the left and right, and the upper end of the upper step is formed by the construction vehicle. Pivotally supports the undercarriage of
The lower step is slidably held by the upper step so that the lower step can be retracted to and from the lower step side of the upper step, and the lower traveling body and the lower step are connected by a swingable link. A step device for a construction vehicle, wherein the step device projects toward the outside of the vehicle around a pivot point of the upper step toward the lower traveling body by the downward projection of the lower step.