JPH08209745A - Back-hoe - Google Patents

Abstract

PURPOSE: To make it possible to carry out work safely while preventing the collision between a back-hoe device and obstacles with the swivel even in a space with narrow width having obstacles on both side thereof in a back-hoe mounting the back-hoe device to the front end of a swivel base. CONSTITUTION: In a back-hoe mounting a swivel base 3 providing a back-hoe device 5 to the front end thereof on a traveling car body equipped with a pair of both right and left crawler type traveling devices 1 in a fully turnable manner, both right and left crawler type traveling devices 1 are separately capable of projecting and recessing operation in the horizontal direction. A swiveling path X of the swivel base 3 passes around the horizontal outside end within the horizontal outside end of each of the crawler type traveling devices 1 in a maximum recessing state in a plan view, and the back-hoe device 5 and crawler type traveling devices 1 are relatively arranged so that a swiveling path Y around the axial core of the swiveling base in a state to fold the back- hoe device 5 passes around the horizontal outside end within the horizontal outside end of each of the crawler type traveling devices 1 in a maximum projecting state in a plan view.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small backhoe in which a revolving base having a backhoe mounted at a front end is mounted on a traveling vehicle body having a pair of left and right crawler type traveling devices so as to be fully rotatable.

[0002]

2. Description of the Related Art Conventionally, in this type of small backhoe, by deploying a crawler type traveling device such that the turning trajectory of a swivel base does not come out from the lateral outer end of the crawler type traveling device in plan view, The swivel base does not collide with other objects when turning.

[0003]

However, when the work is carried out by entering a narrow width place, it is recognized that the swivel does not collide with other objects at the time of turning, so that the crawler type traveling device can enter. Therefore, it is easy to judge that it is possible to work while turning the swivel base.Therefore, if the crawler type traveling device can approach the narrow place in the narrow space where there are obstacles such as sidewalls on both sides, There is a possibility that the backhoe device may collide with an obstacle by a work based on the misunderstanding that there is no collision with, and there is room for improvement in terms of preventing a collision accompanying a turning work. An object of the present invention is to enable work while effectively preventing a collision of a backhoe device and an obstacle due to turning while being able to enter a place having a width as narrow as possible.

[0004]

A characteristic configuration of the present invention is a backhoe in which a swivel having a backhoe mounted at a front end is mounted on a traveling vehicle body having a pair of left and right crawler type traveling devices so as to be fully rotatable. The left and right crawler type traveling devices can be individually extended and retracted in the lateral direction, and the turning trajectory of the swivel base is within the lateral outer end of the crawler type traveling device in the most retracted state in plan view. Passing near the edge, the turning locus around the center of the turning base in the most folded state of the backhoe device should pass within the lateral outer end of the crawler type traveling device in the state of maximum extension in plan view and near the lateral outer end. The backhoe device and the crawler type traveling device are arranged relative to each other.

[0005]

According to the above construction, when entering a narrow width place where obstacles exist on both sides to perform work, one or both of the crawler type traveling devices should be set in the maximum overhang state before entering. , When one of the crawler type traveling devices is in the maximum extension state, it can be made into a manual so that the backhoe device can make a one-sided turning operation passing over the crawler type traveling device that is extended, and the correct operation can be surely executed based on the manual. It is possible to effectively prevent the backhoe device from colliding with an obstacle in a narrow space where obstacles are present on both sides. In addition, since the left and right crawlers can be independently extended, it is possible to work with one of the crawlers in the maximum extension state even in a narrow place where it cannot enter if the left and right crawlers are extended in synchronization. You can work safely in a narrow space.

[0006]

As a result, it is possible to enter a place as narrow as possible in width, and work safely even in a narrow place where there are obstacles on both sides while preventing the collision of the backhoe device with the obstacle due to turning. I was able to construct a backhoe that can be used.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a swivel base 3 having a substantially circular plan shape is provided on a traveling vehicle body having a pair of right and left crawler type traveling devices 1 and a dozer 2 which can be raised and lowered, and a vertical axis which is the center of the circle. The swing bracket 4 is mounted so as to be freely rotatable around P, and is swingably driven by a swing cylinder Cs. A swing bracket 4 is attached to the front end of the swivel base 3, and a boom 5a is driven up and down by a boom cylinder C1, and an extension / contraction drive is performed by an arm cylinder C2. Attached to the swing bracket 4 is a backhoe device 5 composed of a movable arm 5b and a bucket 5c driven by a bucket cylinder C3, and
The swivel base 3 is equipped with the driving part 6 and the boarding operation part 7 to form a small backhoe with a dozer.

As shown in FIGS. 2 and 3, each of the left and right crawler type traveling devices 1 is constructed so that it can be laterally extended and retracted separately by a hydraulic cylinder C4, and a swivel locus X of a swivel base 3 is formed. The crawler type traveling device 2 in the most retracted state in plan view passes within the lateral outer end and near the lateral outer end,
In addition, with the boom cylinder C1, the arm cylinder C2, and the bucket cylinder C3 being most extended and the backhoe device 5 being folded most, the turning locus Y around the center of the turning base of the backhoe device 5 is the maximum in plan view. The backhoe device 5 and the crawler type traveling device 1 are arranged so as to pass within the lateral outer end of the crawler type traveling device 2 in the overhanging state and pass near the lateral outer end thereof.

Therefore, for example, as shown in FIG. 2, one of the crawler type traveling devices 1 is set to the most extended state, and
At the work site where the other crawler type traveling device 1 is in the fully retracted state and the body can barely enter, the backhoe device 5
In the most folded state, the swivel base 3 can be swung back and forth on one lateral side of the machine body, and the earth and sand excavated at the front part of the machine body can be taken out to the rear of the machine body and discharged or loaded on a truck or the like.

Needless to say, at a work site having a lateral width where both the left and right crawler type traveling devices 1 can be entered with the crawler type traveling devices 1 being in the most extended state, the backhoe device 5 is most folded and the swivel base 3 is moved from either direction. But you can work by turning all the way around.

It should be noted that the left and right ends 2a of the dozer 2 are constructed so that they can be independently extended and retracted laterally outward by hydraulic cylinders C5, and in synchronization with the extension and retraction operations of each crawler type traveling device 1, the left and right sides are formed. The dozer end portion 2a is configured to be extended and retracted so that the soil discharging work and the leveling work having the same width as the machine body traveling width can be performed.

[Other Embodiments] The bucket 5c in the most folded state of the backhoe 5 is preferably in a horizontal position in which the scooped earth and sand can be lifted and conveyed without spilling. In this case, strictly speaking, the bucket cylinder C3. Is a little shorter than the maximum extension state, and the amount of extension of the crawler type traveling device 1 may be set in accordance with the turning locus Y at this time. The backhoe device 5 may be attached to the fixed bracket at the front end of the swivel base 3 in a state where the left and right swings are not possible.

It should be noted that reference numerals are given in the claims 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]

1] Overall side view of backhoe

FIG. 2 is a partially cutaway front view of a state in which the backhoe device is in the most folded state and the swivel base is swung.

FIG. 3 is a plan view of a state in which the backhoe device is in the most folded state and the swivel base is swung.

[Explanation of symbols]

 1 crawler type traveling device type traveling device 3 swivel base 5 backhoe device X swivel locus of swivel base Y swivel locus of backhoe device folded

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akira Takashima 64 Ishizukita-machi, Sakai City, Osaka Prefecture Kubota Sakai Factory Co., Ltd. (72) Kenji Hida 64, Ishizukita-machi, Sakai City, Osaka Prefecture Kubota Sakai Manufacturing Co., Ltd. In-house

Claims (1)

[Claims] 1. A backhoe in which a swivel base (3) having a backhoe device (5) at its front end is mounted on a traveling vehicle body having a pair of left and right crawler type traveling devices (1) so as to be fully swivelable. Each of the left and right crawler type traveling devices (1) is separately configured to be laterally extended and retractable, and the swivel locus (3) of the swivel base (3) is in the most retracted state in plan view (1). ) Within the lateral outer edge, pass near the lateral outer edge,
When the backhoe device (5) is folded most, the turning locus (Y) around the turning base axis is within the lateral outer end of the crawler type traveling device (1) in the state of maximum extension in plan view, and the lateral outer end thereof. A backhoe in which the backhoe device (5) and the crawler type traveling device (1) are relatively arranged so as to pass in the vicinity.