JPH06330538A - Boom structure of back hoe - Google Patents

Abstract

PURPOSE:To perform stable and balanced one-point hanging with sufficient strength and simplify and facilitate the hanging and transfer motion and increase the efficiency of the hanging and transfer work of a back hoe, by simply remodeling by making use of the boom in the erected and contained posture. CONSTITUTION:A hook member 15 for hanging a machine body is fitted so as to freely swing at a pair of bracket plates 12, 12 for supporting the arm cylinder 9c of a boom 8. The posture of boom is freely exchanged to either the hanging posture in which the hook member 15 is extended backward than the upper face 8u of the boom 8 in the erected posture moved upward or the contained posture along the longitudinal direction of the boom 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for hanging a backhoe by a crane or the like so that the backhoe can be hung in one place with good balance.

[0002]

2. Description of the Related Art Conventionally, a backhoe has been suspended by three points for movement. That is, with the swivel facing backward, wire cables are hooked at three points, that is, the arm cylinder pivot support bracket of the boom and the hooking portions formed at the left and right ends of the dozer, and these three wire cables are connected to the crane. It was to hang it on the hook.

[0003]

The means using three wire cables has an advantage of being able to suspend and move in a well-balanced manner, but on the other hand, it is necessary to install the wire cables at a plurality of positions and adjust the cable length. It was troublesome. Therefore, it is conceivable to move the swivel table near the center of gravity of the entire backhoe by only one place, so-called one-point suspension, but since the suspension place corresponds to a floor step part made of thin sheet metal, the strength is increased. It was impossible. Further, the means for separately preparing the strength member and mounting it on the step is also difficult to realize because the arrangement space is limited and the mounting portion also requires considerable strength. An object of the present invention is to make it possible to easily perform one-point suspension, which is advantageous in terms of handling and maintenance, by paying attention to the boom, and to make it possible to suspend in a well-balanced manner.

[0004]

In order to achieve the above object, the present invention is to attach a hook member for suspending a machine body to an intermediate portion in the longitudinal direction of a boom, and to raise the hook member in an upright posture. It is characterized in that the posture can be freely changed between a hanging posture that extends rearward from the upper surface of the boom in and a storage posture that extends along the longitudinal direction of the boom.

[0005]

Operation will be described with reference to FIG. 1. In a retracted posture in which a boom suitable for turning and carrying is raised and the excavation work apparatus A is moved to the swivel base 1 side, the position of the center of gravity of the front and rear as a whole is substantially the swivel center. Boom 8 that is on X and folded
The intermediate portion of the is located at a position quite close to the center of rotation X. Therefore, by providing the hook member 15 protruding rearward from the boom 8, the wire cable 17 can be hooked at a position near the center of gravity at a relatively high position, and even if it is hung at one point, it is well-balanced and stably hung. Will be available. Since the boom 8 is a strength member, it is not necessary to separately reinforce it for suspending it, and the hook member 15 can be small in size, so that it is easy to provide strength. Further, when the hook member 15 is in the retracted posture, the amount of protrusion from the boom 8 becomes small, and normal excavation work is not hindered.

[0006]

As a result, it is possible to carry out a stable one-point suspension with sufficient strength and a good balance by a simple remodeling using the boom in the upright retracted posture, which facilitates the suspension movement operation. It has become possible to improve the efficiency of the backhoe hanging and moving work.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. A small backhoe is shown in FIG. 1, A is an excavation work device, 1 is a swivel platform, 2 is a traveling platform, 3 is a crawler traveling device, 4 is a dozer, 5 is a control tower, 6 is an engine hood, and 7 is a floor. It is a step. The excavation work device A includes a boom 8, an arm 9, a bucket 10, and a swing bracket 1.
1, a boom cylinder 8c, an arm cylinder 9c, a bucket cylinder 10c, and the like.

As shown in FIG. 2, a pair of left and right bracket plates 12, 12 for pivotally supporting the arm cylinder 9c are fixed to the upper surface 8u of the boom 8, and the shaft pin 13 and the stopper are extended across the left and right bracket plates 12, 12. The pin 14 is installed. Then, the arm-shaped hook member 15 is attached to the shaft pin 13.
The boom 8 is pivotally supported on the upper side of the boom 8, and the boom 8 is in a standing posture in which the boom 8 is in a standing posture. The swinging posture can be freely changed to (the state of an imaginary line), and the spring 16 wound around the shaft pin 13 urges the storing posture. Boom upper surface 8u of the hook member 15
It is convenient to attach a cushion rubber to the contact surface with and to prevent the collision noise and the vibration noise when self-returning to the stored posture.

Normally, however, the hook member 15 is in the retracted posture, and when the excavation work is performed in this state, and when the hook member 15 is hung and moved by a crane to be loaded on a truck or a container, the hook member 15 is resisted against the winding spring 16. Swing to a suspended posture. When the wire cable 17 is lifted in this state, the back surface of the hook member 15 abuts on the stopper pin 14 to fix the posture, and the hanging point Q at that time is located slightly forward from the center of gravity of the entire machine body. The backhoe is in the position, and as shown in FIG. 1, the backhoe is hung and moved in a slightly rearwardly lowered posture.

As shown in FIG. 3, the shaft pin 13 has a collar 18 formed by a retaining pin 19 having a retaining ring 19A on the tip side thereof.
It has been secured by equipping. And
As shown in FIG. 4, the snap ring 19A is formed with straight line portions 19a, 19a which are drawn so that a tip end portion thereof coincides with the outer diameter of the collar 18, and the backlash with the collar 18 is reduced to prevent the collar from coming off. I am doing it. Note that, as shown in FIG. 5, the retaining ring 19A may be formed in a shape in which a bypass portion 19b that bypasses the tip of the retaining pin 19 is provided.

[Other Embodiments] As shown in FIG. 6, the hook member 15 may be in contact with the end surface of the arm cylinder 9c in the suspended posture, and the pivot shaft 20 may also function as a stopper pin. In this case, the shaft pin 13 is pulled out and the hook member 15 is directed in the opposite direction to the retracted position along the boom 8, and then the preliminary hole 15 in the middle of the longitudinal direction of the member.
The shaft pin 13 is passed through a, and the boom upper surface 8u and the arm cylinder 9c store the boom pin without rattling.

It should be noted that although reference numerals are given in the claims for convenience of comparison with the drawings, the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a side view of a backhoe showing a suspended state.

FIG. 2 is a partially cutaway side view of an essential part showing a hook member mounting structure.

FIG. 3 is a sectional view showing a mounting structure of a shaft pin.

FIG. 4 is a side view showing a retaining pin.

FIG. 5 is a side view of a retaining pin having a retaining ring of another shape.

FIG. 6 is a side view of an essential part showing another structure for attaching a hook member.

[Explanation of symbols]

 8 boom 15 hook member

Claims (1)

[Claims] 1. A boom member (15) for suspending an airframe is attached to an intermediate portion in the longitudinal direction of a boom (8), and the hook member (15) is oscillated upward and is in an upright posture. ) A boom structure of a backhoe configured so that the posture can be freely changed to a hanging posture that extends rearward of the upper surface of the above) and a storage posture that extends along the longitudinal direction of the boom (8).