JPH03213445A - Step locking device for ultra-compact excavator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to the step of a working vehicle.
In particular, the present invention relates to a step locking device for a micro excavator.

[Prior Art] Conventionally, there has been no ultra-compact excavator car that can perform excavation work in narrow spaces. When manufacturing this type of ultra-compact excavator car, in order to make the car body smaller, there was no driver's seat, and workers stood behind the car body and excavated while operating the work boom and packet. It is conceivable that the excavation work or the forward and backward movement of the vehicle body may be carried out by riding on a step provided at the rear of the vehicle body.

[Problems to be Solved by the Invention] In the above-mentioned ultra-compact excavator car, the operator performs digging and driving operations while standing on the steps at the rear of the vehicle, but there are times when the operator performs the above operations while standing at the rear of the vehicle. When doing so, move the step upward so that it does not interfere with the work.

Therefore, a technical problem arises that must be solved in order to make the step freely movable upward and to simplify the movement operation of the step, and the present invention aims to solve this problem. .

[Means for Solving the Problems] This invention has been proposed in order to achieve the two-layered objective, and includes a step arm provided at the rear of the vehicle body so as to be movable up and down, and a step arm at the rear end of the step arm. The step is pivotally attached so that it can be folded freely, a recess with an open top and rear surface is provided at the rear end of the step, and a locking rod is installed inside the step so as to be movable back and forth, and the front end of the locking rod is A step in an ultra-compact excavator car, characterized in that the step arm can be freely locked to the rear end of the step arm, and a handle is provided at the rear end of the locking rod, and the handle is disposed in a recess of the step. The purpose of this invention is to provide a locking device.

[Operation] When the step is not in use, the present invention moves the step arm upward, folds the step, and flips it up, thereby securing the ground clearance of the step portion. The step is fixed by moving the locking rod back and forth, and the front end of the locking rod engages with the rear end of the step arm to lock the step. The handle of the locking rod is disposed in a recess provided at the rear end of the step, and the recess has an open top and rear surface for easy discharge of dirt. There is no risk of dirt accumulating inside the handle and making it impossible to operate the handle.

[Embodiment] An embodiment of the present invention will be described below with reference to the accompanying drawings. Figure 1 shows an ultra-compact excavator car, with the work boom attachment part (2) at the front of the frame (+).
An engine (3) is mounted on the rear of the frame (1). A swing bracket (4) is attached to the attachment part (2), and the base (5a) of the boom (5) is pivotally attached thereto. This swing bracket (
An arm bracket (6) is provided protruding from the negative side of 4).
Swing cylinder (7) installed on the - side of the frame (+)
) is pivotally connected to the arm bracket h (6), and the boom (5) swings left and right by the expansion and contraction of the swing cylinder (7). Then, the boom (5) is moved by the boom cylinder (8) installed between the swing cylinder l-(4) and the intermediate portion (5b) of the boom (5).
rotates vertically around the base (5a). One end (9) of the arm (9) is attached to the tip (5c) of the boom (5).
a) is pivotally connected to the arm cylinder (ID
) to rotate up and down. Furthermore, the tip of the arm (9b
) is pivotally attached to the packet θ+), and the packet θl) is configured to be rotated by the packet cylinder θ→.

At the bottom of the engine (3) is a transmission case (1).
is fixedly installed, and the drive shaft (
+4) protrudes, and drive sprockets 0 on the left and right sides respectively.
0θ is provided. Passive wheels (+6) (10) are pivotally mounted on the left and right sides of the front lower part of the frame (1), respectively, and crawlers (r7) (r
? ).

Also, the arms (19) (19) of the soil removal plate (G) are pivotally connected between the passive wheels (16) (+6), and the arms (19) (+9)
Fix the arm (A) to the rotating base of the (A).

Brackets (21) (21) are hung on both left and right sides of the mission case (1), and the front end of the step arm @) is pivotally connected to the step arm (G), and the rear part of the step arm (G) is connected to the step cylinder. (c). A step (1/I) is pivotally attached to the rear end of the step arm (A) so as to be able to rotate up and down, and a locking rod (C) which will be described later
It locks into the folded position. In addition, there is an arm (A) (4) at the rotation base of the step arm (To) (A).
), and one end of this arm (A) (A) and one end of the arm (20) (2φ) are connected by a force equal to the rod Q. As shown in the figure, the oil tank is installed at the bottom of the frame (1) by penetrating both left and right sides in the front and back direction.Therefore, when the step cylinder (c) is extended, the step arm () is installed. It descends, and the rod Q'b is pulled rearward to remove the earth from the earth removal plate (
The evil arm (19) (0) rotates downward. By setting the length of the rod (2f) appropriately, the slope of the earth removal plate (day arm (+9) (+9) and step arm @ (6) The step arm (22) @ step 0) is formed so as to be grounded later.

Moreover, the fishing rod Q is arranged on both sides of the oil tank (A) without reducing the capacity of the oil tank (A),
Since the rod (27) is not exposed at the bottom of the frame (1), it is possible to prevent damage to the rod (27) due to scattering of pebbles, etc. even when the vehicle body is made low. can.

In FIGS. 3 and 4, to describe the step (G) in more detail, bearings (291 (A)) are provided on the left and right sides of the front end surface of the step (24),
1G! → Insert the pin (A) installed between the rear ends into the bearing part (G) and (A), and pivot the shaft () to the step so that it can rotate up and down. A support plate 01 is provided at the center of the pin (toward).
) 0θ is erected, and the lower end of the step cylinder (G) described above is pivotally connected to the hole @ (2) drilled in the support plate (3+) (3+). A curved guide plate (to) is fixed to the rear upper surface of the support plate (3+) (31), and holes (34a) and (34b) are bored in the upper and lower parts of the guide plate (g), respectively.

On the other hand, inside the step (2), reinforcing plates 05) (a) are hardened at appropriate positions, and a recess (1) with an open top and rear surface is formed at the rear end of the step (b). establish. Then, the locking rod (C) described above is installed inside the step (2).
A locking piece 0'/) is fixed to the front end of the hole (34a) or (34) of the guide plate (c).
b), and a spring (a) is interposed to bias the locking piece Q'b so as to constantly press it forward. Further, a handle (G) is provided at the rear end of the locking rod (0), and this handle (0) is disposed in the recess (G) of the step (2).

Then, grasp the handle () and pull the locking rod (c) backward to remove the locking piece 0'' from the hole (34b).

In this case, the step (b) can be rotated up and down around the pin (a), and by flipping up the step (b) and loosening the grip, as shown by the chain line in Figure 4, the spring ( The locking rod (C) moves forward due to the bias of A), and the locking piece Of) is inserted into the hole (34a) at the top of the guide plate (C).
to engage. Thus, the step) is locked in the folded position as shown by the dashed line.

Note that this invention can be modified in various ways without departing from the spirit of the invention, and it goes without saying that this invention extends to such modifications.

[Effects of the Invention] As described in detail in the above-mentioned embodiment, the present invention can secure the ground clearance of the step portion by folding the step and raising the step arm when the step is not in use. The engagement and disengagement work in this step can be performed extremely easily by pulling the handle of the locking rod. Moreover, since the handle is disposed in a recess with open top and bottom surfaces, even if the recess is filled with dirt, it can be easily discharged. This invention has various effects such as being able to reliably perform the step locking operation without becoming disabled.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which Fig. 1 is a partially cutaway side view of an ultra-compact excavator, Fig. 2 is a vertical sectional view of the main part showing the arrangement of the rods, and Fig. 3 The figure is a plan view of the main parts of the step arm and step, and Figure 4 is A-A in Figure 3.
FIG. (1)...Frame (2)...
・Step arm)・・・−・・Step (
A) - ... Locking rod (G) ... Concave part
0η... Locking piece (a)... Handle patent Applicant: Iseki Agricultural Machinery Co., Ltd. Kobe Steel, Ltd.

Claims (1)

[Claims] A step arm is provided at the rear of the vehicle body so as to be movable up and down, a step is foldably pivoted to the rear end of the step arm, a recess with an open top and rear surface is provided at the rear end of the step, and A locking rod is provided inside so as to be movable back and forth, and the front end of the locking rod can be freely locked to the rear end of the step arm, and a handle is provided at the rear end of the locking rod. A step locking device for an ultra-compact excavator car, characterized in that it is disposed in a recessed portion of the step.