JPH0612202U - Boarding equipment for construction vehicles - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent the danger of getting on and off the cab 2 of a construction vehicle. [Constitution] A lower door 12 constituted by vertically dividing a cab door of a construction vehicle into two parts is opened diagonally downward or downward, and when the lower door 12 is opened, it stands upright and becomes horizontal. The treads 15 and 16 which are folded when the door 12 is closed and are attached to the inner surface of the lower door 12 are installed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a boarding / alighting device suitable for a construction vehicle such as a hydraulic excavator, a bulltozer, or a loader having a crawler type traveling device.

[0002]

[Prior art]

 FIG. 3 shows a conventional equipment for getting on and off a construction vehicle. In FIG. 3, 1 is a crawler belt, 2 is a cab, 3 is a track frame for supporting the crawler belt 1, and 4 is an upper frame. A cab 2 is provided on the upper frame 4, and an operator entrance / exit 5 is provided on the side surface of the cab 2. A handrail 6 is attached to the left side of the doorway 5, a handrail 7 is attached to the right side, and a cab door 8 that opens rearward is attached. A tread plate 9 is provided on the track frame 3 so as to project laterally, and a foot rest 10 is formed on the upper frame 4. An operator can get on and off the cab 2 by using the treads 9 and the upper surfaces of the crawler belt 1 and the foot rests 10.

[0003]

[Problems to be solved by the device]

 In the above conventional device, there is a risk that the operator slips or slips off when stepping on the tread 9 or the foot rest 10, and it is even more dangerous to use the slippery track 1 as a step. there were. Therefore, the following dimensions are defined in the international standard ISO2867 “Access” as necessary items for safety, but it was extremely difficult to satisfy all of these dimensions. Step, foot rest (step board) First step height 700 or less Lift 400 or less Diameter or width 19 or more Left and right width (one leg) 160 or more Foot clearance 150 or more (both legs) 320 or more Foot rest depth 150 or more There is a problem that not only mud easily accumulates, but also this tread 9 is easily damaged by collision with rocks.

[0004]

[Means for Solving the Problems]

 The present invention has been proposed to solve the above problems, and the gist of the present invention is to divide the cab door of a construction vehicle having a crawler-type traveling device into two parts, an upper door and a lower door. When the upper door is attached to the cab so as to open backward, forward or upward, the lower door is attached to the cab so as to open diagonally downward or downward, and the lower door is opened at the lower door. It is a boarding / alighting device for construction vehicles, which is erected to be horizontal and is folded when the lower door is closed and installed with one or more treads attached to the inner surface of the lower door.

[0005]

[Action]

 Since the present invention has the above configuration, the operator opens the upper door and opens the lower door diagonally downward or downward when getting on and off the cab. Then, one or more treads stand upright and become horizontal, and the operator steps on these treads to get on and off the cab. When the lower door is closed, the tread is folded and attached to the inner surface of the lower door.

[0006]

【Example】

 1 and 2 show one embodiment of the present invention. As shown in FIG. 1, the upper door 11 and the lower door 12 are formed by dividing the cab door into upper and lower parts. The upper door 11 is attached to the right side of the doorway 5 so as to open rearward via a hinge. The lower door 12 is attached below the doorway 5 so as to open diagonally downward. A plurality of (two in the figure) treads 15 and 16 are attached to the inner surface of the lower door 12.

FIG. 2 shows details of the lower door 12. The lower door 12 is provided with side plates 14 on both sides thereof, and one end of the pair of side plates 14 is installed at the lower end of the doorway 5 and is rotatably mounted around a horizontally extending pin 13. The inner edges of both ends of the treads 15 and 16 are rotatably supported by the pair of side plates 14 by pins 23 and 25. On the other hand, one end of the link 17 is pivotally attached to the cab 2 by a pin 20, and the other end of the link 17 is pivotally attached to one end of the link 18 by a pin 21. The other end of the link 18 is pivotally attached to the outer edge of the tread 15 by a pin 22. Both ends of the link 19 are pivotally attached to the outer edges of the treads 15 and 16 by pins 22 and 24. In addition, 26 is a stopper.

Then, when the lower door 12 is opened, the treads 15 and 16 rotate around the pins 23 and 25 and stand up, as shown by the solid line in the figure, and the tread 15 comes into contact with the stopper 26 to be level. Becomes Along with this, the tread 16 also becomes horizontal, and the links 17, 18, and 19 occupy the positions shown by the solid lines. Then, the operator can step on and off the cab 2 by stepping on these treads 15, 16. On the other hand, when the lower door 12 is closed, the treads 15, 16 and the links 17, 18, 19 are folded and occupy the positions shown by the one-dot chain line in the figure, and are attached to the inner surface of the lower door 12.

Although the upper door 11 is opened rearward and the lower door 12 is opened downward in the above embodiment, the upper door 11 is opened frontward or upward, and the lower door 12 is opened downward. You can do it. Further, in the above-mentioned embodiment, the treads 15 and 16 are automatically erected or folded when the lower door 12 is opened or closed, but they may be erected or folded by an operator's operation.

[0010]

[Effect of device]

 In the present invention, the bottom door is provided with a tread that stands upright when opened, which makes it easy to comply with ISO standards, and the crawler is covered by the lower door, so the operator can use the crawler as a tread. You can eliminate the risk of using it. Also, since the tread is folded when the lower door is closed and contacts the inner surface of the lower door, the tread does not interfere with the operator when the lower door is closed, and the tread collides with rocks and is damaged. It is possible to avoid this and to prevent mud from adhering to the treads, thus improving the safety when getting on and off.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 shows details of a lower door in the above embodiment,
(A) is a side view, (B) is a partial front view taken along the arrow F of (A).

FIG. 3 is a perspective view showing a conventional equipment for getting on and off a construction vehicle.

[Explanation of symbols]

 1 crawler track 2 cab 5 doorway 11 upper door 12 lower door 15, 16 tread

Claims (1)

[Scope of utility model registration request] 1. An upper door and a lower door are formed by vertically dividing a cab door of a construction vehicle having a crawler type traveling device into upper and lower doors, and the upper door is attached to the cab so as to open backward, forward or upward. The lower door is attached to the cab so as to open diagonally downward or downward, and when this lower door is opened, it stands upright and becomes horizontal, and when the lower door is closed, it is folded and placed on the inner surface of the lower door. A boarding / alighting device for a construction vehicle, wherein one or two treads to be spliced are installed.