JPH09125443A - Hydraulic shovel with front fork - Google Patents

Abstract

PROBLEM TO BE SOLVED: To carry out various works like grabbing, breaking, etc., by fitting simple attachments to a hydraulic shovel. SOLUTION: A hydraulic shovel is provided with a front fork 2 pivotted at the middle position 16 of an arm, between the axial hole 6 for pivotting a bucket at the front end of the support arm 5 of the bucket 1 and the axial hole 7 pivotting a tilt lever turning the bucket 1 to the arm 5, moving from the lower part of the arm 5 to the front face of the bucket 1 so as to cover them. A hydraulic cylinder 4 turning the front fork 2 is provided independently from the hydraulic cylinder turning the bucket 1.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a hydraulic shovel with a front fork.

[0002]

2. Description of the Related Art The role of construction machinery in current civil engineering works is diverse. Among such construction machines, hydraulic excavators are the most general-purpose ones. Hydraulic excavators are used not only for basic excavation and loading operations but also for various operations by replacing their buckets with various attachments. Above all, there is a method in which a bucket is replaced with a pair of upper and lower forks, and the pair of forks is operated by a hydraulic cylinder to dismantle a house.

[0003]

In the above-mentioned fork attachment ment, the bucket is removed, and the boss for mounting the bucket is attached with one.
Since a pair of forks is attached, it is troublesome and time-consuming, and when the bucket is used, it has to be replaced every time.

In addition, one of the conventional fork attachments
The pair of forks has a structure that opens and closes in synchronization with each other by a single hydraulic cylinder, so it is not possible to retract one of them and use the other fork alone, which is inconvenient. there were.

An object of the present invention is to attach a simple attachment to a hydraulic excavator so that various operations such as grasping and crushing can be performed.

[0006]

According to the present invention, the above-mentioned problem is solved as follows. (1) Between a position where a front fork covers the opening of the bucket at the tip of an arm that supports a work bucket, and a retracted position that is close to or overlaps with the arm and does not hinder the work of the bucket. Is attached to the arm separately from the hydraulic cylinder for rotating the bucket.

(2) In the above item (1), the front fork is pivotally mounted between the bucket pivot shaft of the arm and the pivot shaft of the chilled lever that pivots the bucket.

(3) In the above item (1) or (2), the other end of a pivot lever having one end fixed to a main shaft fixed to the rear end of the front fork is pivotally supported on the arm,
The other end of the operating lever having one end fixed to the main shaft is connected to the hydraulic cylinder.

(4) In the above item (3), the main shaft of the front fork is a round rod, and the pivot lever and the actuating lever are fixed to the rod.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION A hydraulic excavator (A) according to an embodiment of the present invention shown in FIG. 1 has a front fork (2) below a working bucket (1). The front fork (2) is operated by a hydraulic cylinder (4) different from the hydraulic cylinder (3) for operating the bucket (1), and cooperates with the bucket (1) to grasp an object, You can do crushing work.

FIG. 2 is an enlarged view showing a tip portion of an arm (5) to which the front fork (2) and the bucket (1) are attached, and FIG. 3 is a view for explaining an operation state of the front fork (2). Things.

As shown in FIGS. 2 and 3, the bucket (1) of the excavator is rotatably mounted on a boss or shaft hole (6) provided at the tip of an arm (5) by a pivot (6a). Have been. The arm (5) has a boss or a shaft hole (7) provided at a distance from the front side of the shaft hole (6), and a tilt arm.
One end of (8) is rotatably mounted on a pivot (7a). The other end of the tilt arm (8) is connected to the hydraulic cylinder (3) on the one hand and to the link (9) for tilting the bucket on the other hand, and by this conventional mechanism, the bucket (1) is connected to the hydraulic cylinder (3). Is tilted.

According to the present invention, a front fork (2) is mounted on the lower side of the arm (5), that is, on the opposite side of the bucket (1) as described above. The front fork (2) is composed of a pair of forks (10) having a concave / convex portion for gripping articles on the side opposite to the bucket, and a round bar (for example, having a diameter of 90 mm) fixed to the base end of these forks (10). Spindle made of round steel)
And a pivot lever (12) having one end fixed to the main shaft (11) and the other end pivotally connected to the arm (5) and one end fixed to the main shaft (11) and the other end fixed to the hydraulic cylinder (4). ) And an actuating lever (13) pivotally attached to the main member. These are fixed by welding. In addition to the main members, a reinforcing member (14) and an auxiliary fork (15) as shown in the figure can be provided at the front of the fork (10).

As described above, the other end of the pivoting lever (12) is pivotally connected to the arm (5), and the position of the boss or shaft hole (16) for the pivoting is determined by the aforementioned bucket ( Boss for 1) or midway between shaft holes (6) (7). This is a fork (10)
This is to prevent the attachment from being hindered when the other attachment is mounted. In the illustrated embodiment, the position of the shaft hole (16) is shifted downward from the line connecting the centers of the shaft holes (6) and (7), but it may be on the center line.

With such a construction, for example, the bucket (1) is held at the tilting position shown in FIG. 2, and in this state, the front fork (2) is operated by the hydraulic cylinder (4) and the bucket (1) is operated. , The object such as the roof or wall of the house to be dismantled can be grasped or broken between the bucket (1) and the front fork (2).

When the bucket (1) is used for its original digging work and loading work, the front fork (2)
As shown by the imaginary line in FIG. 3, if the arm is brought into contact with, close to, or greatly retracted from the retracted position where the arm overlaps with the arm, it does not become an obstacle,
Work can be performed without any trouble. When transporting a hydraulic excavator, the arm can be folded and transported with the front fork attached. The attachment and detachment of the front fork can be easily performed only by pulling out three pins.

[0017]

According to the present invention, without removing the bucket of the hydraulic excavator, it can be used as it is, and by attaching the front fork, it is possible to perform work such as grasping and crushing objects in cooperation with the basket. In addition, when excavating or loading, the bucket can be used as it is by retracting the front fork to the retracted position without removing it.

Therefore, for example, in a demolition operation of a wooden house, an integrated operation such as timber crushing, waste disposal, loading operation, and the like can be performed by one hydraulic excavator without requiring any attachment replacement.

According to the second aspect of the present invention, the original operation of the bucket is not hindered by the rotation and attachment / detachment of the front fork.

According to the third aspect of the present invention, the other end of the pivot lever, one end of which is fixed to the main shaft fixed to the rear end of the front fork, is pivotally supported by the arm and the other end is fixed to the main shaft. By connecting the other end of the actuating lever to the hydraulic cylinder, the front fork can be operated as freely as a bucket.

When the main shaft of the front fork is a round bar and the pivot lever and the actuating lever are fixed to the main shaft of the front fork, the skeleton of the front fork can be accurately constructed by a simple basic member having a small number of points. It can be formed easily and is easy to install. Furthermore, since the round bar is used as the main shaft, the contact parts with the pivot lever and the actuating lever are all circular or cylindrical surfaces. This type of hydraulic excavator can be adapted and welded and fixed. In addition, the width of the front fork can be freely selected with the width of the round bar centered around the round bar, and it can be firmly installed on the round bar.

[Brief description of the drawings]

FIG. 1 is a schematic side view of one embodiment of the present invention.

FIG. 2 is an enlarged perspective view of a tip portion of an arm of the hydraulic excavator shown in FIG.

FIG. 3 is an enlarged side view showing only a relationship between a front fork and an arm shown in FIG. 2;

[Explanation of symbols]

 (A) Hydraulic excavator (1) Bucket (2) Front fork (3) (4) Hydraulic cylinder (5) Arm (6) Boss or shaft hole (6a) Axis (7) Boss or shaft hole (7a) Axis (8 ) Tilt arm (9) Link (10) Fork (11) Main shaft (12) Pivoting lever (13) Activating lever (14) Reinforcing member (15) Auxiliary fork (16) Boss or shaft hole

Claims (4)

[Claims] 1. A position at which a front fork covers an opening of the bucket at the tip of an arm that supports a bucket for work, and a retracted position that is close to or overlaps with the arm and does not hinder the work of the bucket. A hydraulic excavator with a front fork, wherein a hydraulic cylinder pivotally mounted between the two is pivotally mounted, and a hydraulic cylinder for rotating the front fork is attached to the arm separately from the hydraulic cylinder for rotating the bucket. 2. A hydraulic excavator with a front fork according to claim 1, wherein the front fork is pivotally mounted between a bucket pivot shaft of the arm and a pivot shaft of a chilled lever for pivoting the bucket. . 3. A main shaft fixed to the rear end of the front fork has one end fixed to a pivot lever, the other end pivotally supported by an arm, and the main shaft fixed to the other end has a hydraulic pressure applied to the other end. The hydraulic excavator with a front fork according to claim 1 or 2, wherein the hydraulic excavator is connected to a cylinder. 4. The hydraulic excavator with a front fork according to claim 3, wherein the main shaft of the front fork is a round bar, and the pivot lever and the actuating lever are fixed to this.