JPS621932A - Arm-fitting structure for back hoe - Google Patents

Abstract

PURPOSE:To improve the operability of a back hoe by a method in which a working arm is provided in a rocking manner to a swing bracket attached in a laterally turnable manner through a vertical shaft to a slewing base, and the positional relation between the widthwise center line of the arm and the vertical shaft is specified. CONSTITUTION:An operator section 4 and an oil tank 7 are bilaterally set in parallel on a slewing base 3 attached in a freely driving and slewing manner around the vertical shaft core P to a traveling vehicle 2. A swing bracket 8 is also provided in a bilaterally slewing manner through the vertical shaft P1 on a base 3 in front of an operator section 4, and an arm A for excavating work is attached in a vertically rocking manner to the bracket 8. In this case, the vertical shaft P1 is relatively set by biasing it to one of the left and right sides, or to the left side, for example, rather than the center line O in the widthwise direction of the arm A, thereby avoiding the intrusion of the arm A into the operation section 4 during the turning period of the bracket 8.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a swivel base that is provided so as to be able to drive and rotate around a vertical axis with respect to a traveling vehicle body, and a tip edge of a boarding and driving section that is provided on the swivel base. This invention relates to a backpaw in which a swing bracket is attached to the swing bracket so as to be rotatable left and right via a vertical shaft located forward of the back paw, and a working arm is provided on the swing bracket so as to be swingable upward.

[Conventional technology]

Conventionally, in the above-mentioned backhoe, the vertical axis for the swing bracket is placed on the center line of the arm in the 11 directions, and the vertical axis is arranged so that the arm can be rotated 90 degrees to the left or right with respect to the swivel base. The shaft was placed at a position that protruded sufficiently beyond the leading edge of the boarding and driving section.

[Problem that the invention seeks to solve]

However, when performing normal excavation work in which the arm is raised and lowered forward with the arm facing forward without rotating relative to the swivel table, the turning radius becomes large because the arm tip protrudes a large amount from the swivel table. When operating the swivel base in a narrow space, the tip of the arm may easily collide with other objects.
There was a risk that workability would deteriorate.

The object of the present invention is to move the arm 90 degrees to the left and right with respect to the swivel base.
It is at the offset point so that it can be rotated by 0 degrees and the vertical axis can be placed in a position that does not protrude too much from the leading edge of the boarding and driving section.

[Means for solving problems]

The characteristic configuration of the Huckhou arm and handle 91 structure in the present invention is that the vertical axis is disposed relative to the swing bracket so that it is offset to one side of the left and right from the center line in the width direction of the arm. There is a certain thing, and its effect is,
It is as follows.

[For production]

In other words, when making it possible to rotate the arm 90 degrees to the side where the vertical axis is deviated from the swing bracket,
Since the distance between the side surface of the swing bracket in the rotational direction and the vertical axis is smaller than that of the conventional structure, the vertical axis can be placed at a position where it does not protrude too much from the tip end edge of the riding and operating section.

〔Effect of the invention〕

Therefore, with a simple modification that allows the arm to be rotated 90 degrees from left to right to the left, making it easier to perform ditch digging work in narrow spaces, the 1ffl By reducing the turning radius during regular excavation work, it is now possible to work in narrow spaces without the arm colliding with other objects.

〔Example〕

Next, embodiments of the present invention will be described based on the drawings.

As shown in FIG. 2, a swivel base (3) is attached to a traveling vehicle body (2) equipped with a crawler traveling device (1) so as to be able to rotate freely around the vertical axis (P), and on this swivel base (3), cabin(
6) The boarding operation section (4) and oil tank (7) are installed side by side on the left and right, and the engine equipment (5) is installed behind them.
), the swing bracket I-(8 ) is attached to the swing bracket (8), and an excavation work arm (8) is provided on the swing bracket (8) so as to be swingable up and down, thereby constructing a backhoe capable of digging side ditches.

As shown in FIG. 1, the swing bracket (8) has its vertical axis (P1) aligned with the working arm (A).
They are relatively arranged so as to be offset to the left of the center line (O) in one direction. In other words, even if the vertical axis (P1) is not placed in a position that protrudes forward, the swing bracket 1-(8) can be I-(8) and working arm (
A) is constructed so that it does not enter the operating section (4).

Two wooden link members (9A) are pivotally connected to the swivel base (3) and the side of the swing bracket (8).
, (9B), the two ends of the bent link (9) are pivotally connected to each other, and the link member (9B) on the swivel base (3) side is connected.
A hydraulic cylinder (10
) with a small stroke hydraulic cylinder (10
) is also configured so that the swing bracket (8) can be largely rotated around the vertical axis (p, ).

To configure the working arm (8), a boom (16) is connected to a swing bracket (8), and an arm (1) equipped with a bucket (17) at the tip is attached to the boom (16).
), and these booms (16) and arms (
18) and a hydraulic cylinder (19) for bending and driving the brush saw 1-(17) around the horizontal axis.

[Another example]

The vertical axis (P1) is the center of the working arm (8) in the width direction with respect to the swing bracket (8)! l,'
In addition to being deviated to the left side of 1 (O), it may also be deviated to the right side; in this case, the swing bracket (8)
All you have to do is turn it 90 degrees to the right.

The boarding and operating section (4) may be of an open type without a cabin (6).

BRIEF DESCRIPTION OF THE DRAWINGS The drawings show an embodiment of the backhoe arm attachment structure according to the present invention, and FIG. 1 is a plan view of the main parts, and FIG. 2 is an overall side view of the backhoe. (2)...Traveling vehicle body, (3)...Swivel base, (4)...Boarding and operation section, (8)...
・Swing bracket, (A)...Work arm, (O)...Center line, (P)...Vertical axis, (P1)...・Vertical axis.

Claims (1)

[Claims] A swivel base (3) is provided on a swivel base (3), which is provided so as to be able to freely rotate around a vertical axis (P) with respect to the traveling vehicle body (2), and is located forward of the leading edge of a boarding/driving unit (4) provided on the swivel base (3). Vertical axis (P_1
), a swing bracket (8) is attached to the swing bracket (8) so as to be rotatable left and right, and a working arm (A) is provided on the swing bracket (8) so as to be swingable up and down. and the vertical axis (P
_1) is the center line in the width direction of the arm (A) (
A backhoe arm mounting structure that is relatively arranged so as to be offset to the left or right side from O).