JPH0525840A - Safety device for earthwork machine - Google Patents

Abstract

PURPOSE:To permit a working machine to be used when an operating section becomes safely protected by a protective frame as well as enable the protective frame to be smoothly introduced into the machine body without obstruction at the inlet. CONSTITUTION:A protecting frame 12 having a protecting attitude covering the upper part of an operation section 5 on the machine body 3 is erectly provided. The frame 12 is also divided in such a way as to enable it to switch to a protective attitude and a lower attitude lower then the protective attitude. A detection means 14 to detect whether the frame 12 is in protective attitude is provided. On the basis of the detected results of the detection means 14, a working machine 6 set on the machine body 3 is put into inactive when the frame 12 is not in a protective attitude by a containment means provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety device for an earthworking machine for protecting earth and sand from falling into a control section.

[0002]

2. Description of the Related Art Conventionally, as a structure of this type, in an earthmoving machine such as a backhoe, the upper part of the control section is covered between the control section and a working device arranged on the side of the control section. It is known that a protective frame is provided upright so as to take a protective posture.

[0003]

However, in the above-mentioned conventional structure, the protection frame having an integral structure is fixed to the machine body. There is a risk that a protective frame may be used at the entrance of the building, and the earthmoving machine could not be introduced into the house depending on the height of the entrance.

The present invention has been made in view of the above-mentioned circumstances, and a state in which the body can be smoothly introduced into the house without the protective frame sticking to the entrance, and the control section is safely protected by the protective frame. The purpose of the present invention is to provide a safety device for an earthmoving machine that enables the working device to be used when it becomes.

[0005]

In order to achieve the above object, a safety device for an earthmoving machine according to the present invention is provided with a protection frame which is constructed so as to take a protective posture to cover an upper portion of a control section on a machine body. In addition, the protection frame,
The protective posture and the posture that is lower than the protective posture are divided so that the posture can be switched, and a detecting unit that detects whether the protective frame is in the protective posture is provided, and the detecting unit detects the detecting posture. On the basis of the result, when the protective frame is not in the protective posture, a restraint means for disabling the working device mounted on the machine body is provided. The actions and effects of this characteristic configuration are as follows.

[0006]

In other words, the protective frame formed by dividing the protective frame into a posture lower than the protective posture of the normal protective frame can prevent the protective frame from obstructing the entrance of the house or the like. Also, when the protective frame is not in the protective posture, a check mechanism is provided to disable the working device equipped on the aircraft, so if you forget to return the lowered protective frame to the normal protective posture, start the work Even if you try, the work device does not work, so you cannot work unless you put the protective frame in the proper protective posture.

[0007]

Therefore, since the machine body can be introduced into a house or the like having a small entrance, the versatility of the work place can be enhanced, and whether the work device can be operated depending on whether the protection frame is in a normal protection posture or not. As it can be understood by whether or not it is possible to work only when the control part is protected by the protective frame, and the safety of the operator can be improved.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show a backhoe as a kind of earthmoving machine according to the present invention. This backhoe is provided with a swivel base 3 as a machine body that can freely swivel around a longitudinal axis with respect to a traveling machine base 2 having a pair of left and right crawler traveling devices 1, 1, and a driving unit 4 for the swivel base 3. , A control unit 5, and a backhoe device 6 as a working device.

The backhoe device 6, as shown in FIG.
The boom 7, the offset arm 8 and the arm 9 are connected in series in a bendable / extendable state, and the bucket 10 is pivotally connected to the tip end of the boom 7 to the boom 7 to Each bucket 10 is configured to be operated by a hydraulic cylinder.

Between the control unit 5 and the backhoe device 6,
As shown in FIG. 1, a protection frame 12 provided with an eaves-shaped portion 11 is provided upright on the upper portion in a cantilever manner so as to cover the upper portion of the control portion. The protective frame 12 includes a lower frame portion 1 in which a frame member made of a plate-like member is fixed to a swivel base 3.
2A and the upper frame portion 12B provided with the eaves-shaped portion 11 in a row and provided with a window portion are divided into upper and lower parts. The upper frame portion 12B is pivotally supported by the hinge structure 13 at the rear end portion of the lower frame portion 12A so that the upper frame portion 12B can oscillate and swing around the horizontal axis, and the upper frame portion 12B is also supported.
A lock portion is provided at the front end portion for fixedly supporting the lower frame portion 12 </ b> A in the upright posture. further,
At the front end of the lower frame portion 12A, the upper frame portion 1
When 2B is in an upright posture and is in a connected state with the lower frame portion 12A, a limit switch 14 is provided as a detection means that is pressed by an operation arm attached to a front end portion of the upper frame portion 12B to perform a switching operation in an ON state. . The limit switch 14 is connected to a control circuit 15 and sends a pilot signal for opening a pressure oil passage from the control circuit 15 to an electromagnetic valve that supplies pressure oil to each hydraulic cylinder for driving the backhoe device 6. A control circuit is connected to the solenoid of the electromagnetic valve so as to output. Further, the control circuit 15 allows the backhoe device 6 to be normally operated by the output signal when the limit switch 14 is turned on, and the output signal when the limit switch 14 is turned off by the output signal. A check circuit 16 is provided as a check means for checking so as not to output a pilot signal for opening the pressure oil passage to the electromagnetic valve.

Therefore, according to the above construction, the upper frame portion 12B is raised so that the eaves-shaped portion 11 covers the upper portion of the control portion 5 to prevent the earth and sand from falling from the backhoe device 6 and the like. In addition, as shown in FIG. 1, when the height of the protective frame 12 is lowered by lowering the upper frame portion 12B with respect to the lower frame portion 12A by the hinge structure 13 at the rear of the body, the entrance of a house or the like is reduced. You can prevent the protection frame 12 from hitting with
If the upper frame portion 12B is left in the lying position,
The restraint means actuated by the detection result of the limit switch 14 restrains the operation of the backhoe device 6.

The detecting means may be one which mechanically detects and mechanically restrains the backhoe device, and the restraining means supplies a hydraulic pump for supplying pressure oil for driving the backhoe device. It may be a means for stopping.

In the claims for utility model registration, reference numerals are given for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a front view showing the vicinity of a steering section of a backhoe.

FIG. 2 is a plan view showing a backhoe.

FIG. 3 is an overall side view showing a backhoe.

[Explanation of symbols]

 3 Aircraft 5 Control Section 6 Working Device 12 Protective Frame 14 Detecting Means

Claims (1)

Claims: What is claimed is: 1. A protection frame (12) configured to take a protective posture that covers an upper portion of a control section (5) on a body (3) is erected, and the protection frame (1) is provided.
A detection means (14) for dividing the protective posture (2) into a protective posture and a posture lower than the protective posture so that the protective frame (12) is in the protective posture. And, based on the detection result of the detection means (14), when the protective frame (12) is not in the protective posture, the working device (6) mounted on the machine body (3) is made inoperable. A safety device for earthworking machines equipped with a check mechanism.