JPH03144025A - Rear step elevation safety device for subminiature shovel car - Google Patents

Abstract

PURPOSE:To secure the safety of an operator by restraining the turning of an elevating lever with a lock arm, and locking one end of the lock arm and a restraining tool of a hear step with a wire, and operating the restraining tool to cancell the restraint of the elevating lever. CONSTITUTION:A rear step elevating device, which consists of an elevating lever 16, a link 17, a hydraulic cylinder 21, a rear step 22, a restraining tool 23 and a lock am 25 or the like, is provided in the rear of a rear frame 1. The lock arm 25 is turnably provided on the way of the link 17 of the elevating lever 16, and is energized so as to always restrain the turning of the elevating lever 16. One end of a wire 24 is locked with the lock arm 25, and the end of the wire 24 is locked with the restraining tool 23. Next, the restraining tool 23 is operated to turn the lock arm 25 connected to the wire 24 to cancel the restraint of the elevating lever 16. The elevating lever 16 can be thereby turned only at the time of treading the restraining tool 23.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a rear step lifting/lowering safety device for a super heavy excavator, and in particular, to a rear step lifting/lowering safety device for restraining the rotation of the lifting lever on the rear step side. This relates to a lifting safety device.

Until now, there has been no super heavy excavator that can perform excavation work in narrow spaces with obstacles on either side. In manufacturing this type of ultra-compact excavator car, in order to make the car body smaller, there is no driver's seat, and the worker stands behind the car body and excavates while operating the work boom and packet.
Alternatively, it is conceivable to carry out the excavation work or move the vehicle back and forth while riding on a rear step provided at the rear of the vehicle. and,
A hydraulic cylinder is connected to the rear step, and the hydraulic cylinder is expanded and contracted by rotating an elevator lever, thereby raising and lowering the rear step.

[Problems to be Solved by the Invention] In the above-mentioned ultra-compact excavator car, the operator performs digging and driving operations while riding on the rear step of the vehicle body. When moving the machine back and forth, the rear step is raised so that it does not get in the way of work. At this time, it is possible that the worker operates the lift lever while remaining on the rear step, and in such a case, an accident such as the worker's foot getting caught between the vehicle body and the rear step may occur due to operator error. There is a possibility that this may occur.

Therefore, a technical problem arises that must be solved in order to prevent such a danger and prevent the rear step from rising or falling unexpectedly, and the present invention aims to solve this problem. .

[Means for Solving the Problems] The present invention has been devised to achieve the above object, and a hydraulic cylinder is connected to the rear step provided at the rear of the frame, and the lift lever is rotated to 111
1. In the rear step elevating device in which the pressure cylinder is configured to expand and contract, a lock arm is provided at the rotary mechanism 7 in the middle of the link of the elevating lever so as to constantly check the rotation of the elevating lever. 14 of the wire is engaged with the lock arm, and the other end of the wire is engaged with a restraining device provided on the rear step, and by inserting d/1 of the restraining device. The present invention aims to provide a rear step elevating safety device for an ultra-compact excavator car, characterized in that the opening/trick arm connected to the wire is rotated to release the restraint on the elevating lever. be.

[Function] The lock arm provided in the middle of the link of the lift lever is biased so as to restrain the rotation of the lift lever.
Normally, the elevator is in a locked state. Therefore, even if an operator accidentally touches the lift lever while standing on the rear step, there is no risk of the rear step being moved up or down incorrectly.

On the other hand, when it is desired to raise or lower the rear step, the user depresses the restraining device provided on the rear step, pulls the wire of the lock arm, and rotates the lock arm to release the restraint on the raising/lowering lever. When the lift lever is then rotated, the hydraulic cylinder expands and contracts, and the rear step moves up and down.

[Embodiment] Hereinafter, an embodiment of the present invention will be described in detail with reference to attached drawing 1. Figure 1 shows a stripped down ultra-compact excavator.
The mounting part (3) of 2) is provided protrudingly, and the frame (
Crawler frames (4) (4) are installed below on both the left and right sides of 1). A mission case (5) is installed below the rear part of the upper frame (+).
The drive sprocket (6) (6) shaft support (
7) In addition to providing (7), each shaft support (7) (7)
are connected to the rear ends of the left and right crawler frames (4) (/l). Furthermore, the left and right crawler frames (4) (
Passive wheels (8) (8) are pivotally attached to the front end of 4), and crawlers (Q) (Q) are mounted between the driving sprockets (6) (6) and the driven wheels (8) (8).
Wrap it around. Then, the engine (10) is mounted on the upper part of the mission case (5).

A bonnet frame (11) is fixedly attached to the upper part of the upper frame (+).
A bonnet cover (12) is attached to the bonnet cover (12) to cover engine parts such as the engine (10).The left and right extraction pressure operation levers (133 (I) are attached to the top surface of the bonnet cover (I2).
n, a travel lever (14) for switching forward and backward, and 0 sub-shift levers are provided protrudingly provided, and a step elevation lever (Ill) is provided protruding from the rear surface of the bonnet cover (12). 10 is freely rotatable downward, and the link (r
7) is connected to the hydraulic control valve (4 operating rods (0).

On the other hand, the front end of the step arm [phase] is pivotally connected to the lower part of the mission case (5), and the step arm (4)
A hydraulic cylinder (2+) is attached to the step arm so that it can freely rotate up and down, and a rear step @ is attached to the rear end of the step arm [phase]. A restraining device @ is pivotally mounted at an appropriate position on the rear step @, and one end of the wire (B) is locked to the restraining device (to), and the wire (C) is
The other end is locked to a lock arm (01) provided inside the bonnet frame (01).

Fig. 2 shows the connection between the link (r7) of the lift lever (10) and the operating rod, and a bell crank (6) is pivotally attached to the bin (4), and one end of the bell crank Q force is shown in Fig. 2. The front end of the link (r7) is pivotally connected to (27a), and the operating rod (0) is connected to the other end (27b) of the bell crank (27b).The position near the other end (27b) is A guide groove (1) is opened in the lock arm, and a lock pin (to) protruding from the lock arm is loosely inserted into the guide groove. A lock 1 (28b) is cut out in the direction of the pin (4) from the lock arm and has a substantially T-shape.Also, a spring (not shown) is attached to the lock arm so that the lock 1 (28b) is cut out in the direction of the pin (4). It is biased to rotate clockwise, and normally the lock pin (to) is in contact with the end of the lock iM (28b), so the bell crank Q'b is in a locked state. It has become. Therefore, the rotation of the lift lever (16) is restrained, and the rear step does not move up or down.

Here, by stepping on the restraining device (to) on the rear step @ shown in Fig. 1, the wire (〇) is pulled, and as shown by the chain line in Fig. 2, the lock arm @ is pushed into the pin (
(to) in the counterclockwise direction. Therefore, the lock pin (28b) moves from the lock R (28b) to the length 7M (28a), the zero force of the bell crank is released, and the restraint of the lift lever (10) is released.

Then, as shown in the chain line in Fig. 3, the elevator lever (10
When attempting to rotate upward, the bell crank 0 force is rotated clockwise through the link (0), and the lock pin (to) slides to the lower end of the length (28a). .In this way, the operating lever (O) is pulled upward, pressure oil is pumped from the control knob (see Fig. 1), the hydraulic cylinder (21) contracts, and the rear step @ rises. Thereafter, when the restraint member (1) is released, the wire (2) is relaxed, and the lock arm (2) is rotated clockwise by the bias of the spring.

The lock pin (8) then comes into contact with the end of the lock 1 (28b) of the bell crank (g), locks the bell crank (2), and prevents the rotation of the lift lever (10) again. Ru.

In this way, the lift lever (10 degrees) can be rotated only when the restraining device @ of the rear step @ is depressed, and it becomes possible to raise and lower the rear step @, and when the restraining device @ is stopped being depressed, the lifting lever (10 is in a locked state, and the rear step (to) will not be raised or lowered accidentally.

It should be noted 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 allows the elevating lever to be rotated only when the restraining device is depressed. Therefore, even if the worker tries to operate the lift lever by mistake, the rotation of the lift lever will be checked and the rear step will not move up or down accidentally, preventing the worker's foot from getting caught in the car body. Accidents can be avoided. Furthermore, since the restraint device is provided on the rear step, the restraint can be released while remaining on the step. Therefore, this invention has various effects, such as improving work safety and reliability, and making operation easier.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a side view of a micro-excavator, and FIGS. 2 and 3 are side views of essential parts for explaining the operation of the lock arm. (＋＞・・・・・・Upper frame (10・・・・・・
・Lifting lever (■...link (21)...-hydraulic cylinder@...to rear step)...to restraint device)... Lock arm patent applicant Iseki Agricultural Machinery Co., Ltd. Kobe Steel, Ltd.

Claims (1)

[Claims] In a rear step lifting device in which a hydraulic cylinder is connected to a rear step provided at the rear of the frame, and the hydraulic cylinder is expanded and contracted by rotating the lifting lever, the lifting lever is locked in the middle of the link. An arm is rotatably provided and always biased to check the rotation of the lift lever, one end of the wire is locked to the lock arm, and the other end of the wire is provided on the rear step. An ultra-compact excavator car, characterized in that it is configured to be locked to a restraint tool, and when the restraint tool is stepped on, a lock arm connected to the wire is rotated to release the restraint on the lifting lever. Rear step lift safety device.