JPS6013868Y2 - Backhoe main boom mounting bracket - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a mounting bracket for a main boom for excavating a backhoe.

Conventionally, in this type of boom, the base of the main boom is pivotally mounted to a U-shaped frame when viewed from above, allowing it to move up and down, and the tip of a hydraulic cylinder is attached to a protrusion provided on either the left or right side of the boom. Excavation work is carried out by pivoting the main boom to swing from side to side and fixing it at a fixed position using the hydraulic cylinder.
7-42082).

However, in this publication, the main boom is not swung to both the left and right ends, and furthermore, if excavation work is attempted with the main boom positioned at both the left and right ends, the main boom cannot be supported reliably. It had drawbacks.

The present invention was devised to eliminate the drawbacks of the prior art, and the configuration of the present invention will be described in detail below based on embodiments shown in the accompanying drawings.

Reference numeral 1 denotes a machine frame body of a power working machine, and an excavating device 2 is mounted on the front part thereof so as to be able to move up and down in the vertical direction and swing freely in the left and right directions.

Reference numeral 3 denotes a main boom that connects the intermediate boom 4 and the excavation packet 5, and its base 6 is attached to a mounting bracket 7, which is a U-shaped frame 30, so that it can move up and down in the vertical direction, that is, it can move up and down.

Reference numeral 8 denotes a U-shaped bracket that supports the mounting bracket 7 so as to be swingable in the left-right direction, and is provided protruding from the front side of the machine frame body 1.

Numeral 9 is a fulcrum pin, and 10 is a hydraulic cylinder interposed between the inside of the machine frame body 1 and the left side of the mounting bracket 7. The main boom 3 is configured to be able to swing from side to side as a whole by expanding and contracting as appropriate. are doing.

11 is a bottle hole bored in the protrusion 12 on the left side of the mounting bracket 7;
The tip of the hydraulic cylinder 10-0) is pivoted at a position closer to the machine frame body 1 than the position of the bottle hole 11.

13 is a bottle hole drilled in the protrusion 14 on the right side, 15 is a bottle hole drilled in the protrusion 16 protruding from the left side of the front end of the machine frame body 1;
Reference numeral 17 denotes a bottle hole bored in the protrusion 18 protruding from the right side.

The pin holes 15 and 17 on the side of the machine frame body 1 are connected to the mounting bracket 7.
When the bottle hole 13 swings significantly to the left or right, the bottle hole 13
15, and these constitute connecting portions 19 and 20.

21 is a fixing pin.

Further, 22 is a traveling device that supports the machine frame body 1 in a rotatable manner, and 23 is an engine mounted at the rear.

The present invention has the above-mentioned configuration, and therefore, during normal work, the machine frame body 1 is fixed and only the main boom side is swung left and right by the hydraulic cylinder 10 during excavation work. When digging a trench, etc., when carrying out excavation work in a position where the mounting bracket of the main boom 3 is moved largely to either the left or right side, when the mounting bracket of the main boom 3 is moved to the left side, the bin hole 11 is
The fixing pin 21 is fitted by aligning the bottle hole 15 with the bottle hole 15, and the fixing pin 21 is fitted by aligning the bottle hole 13 and the bottle hole 17 when the bottle is moved to the right.

Therefore, excavation work can be performed by moving the main boom 3 up and down only in the vertical direction without the hydraulic cylinder 10 operating.

Since the present invention described above adopts the configuration described in the scope of claims for utility model registration, it has achieved the following effects.

■ Even when the main boom 3 of the excavation rig is moved widely to both the left and right ends, the main boom 3 can be securely fixed to the machine frame body 1, and therefore the main boom 3 can be prevented from accidentally falling down or vibrating. This allows work to be carried out safely and efficiently without having to do anything.

■ Pin holes 11 and 13 are provided in the protrusions 12 and 14 in the left and right direction, and protrusion seats 16 are provided on both left and right sides of the front end of the machine frame body 1.
Since there are no members obstructing the upper part, the work of inserting the fixing pin 21 can be made simple, and the structure is simple.

■ Hydraulic cylinder 1 pivoted to protrusion 12 or 14
Since the tip of 0 is located closer to the machine frame body than the position of the bottle hole 11 or 13, the left and right rocking of the machine frame body 1 can be made larger due to the presence of the protruding mounting bracket 7. The main boom 3 can be largely rotated with respect to the machine frame body 1 to expand the excavation range of the backhoe, and the extension of the hydraulic cylinder 10 can be reduced to prevent buckling failure of the hydraulic cylinder 10. As a result, the bending moment generated in the mounting bracket 7 can be reduced and the mounting bracket 7 can be made more robust.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 shows a backhoe equipped with the device of the invention, Fig. 2 is an enlarged sectional view of the main parts of the invention, and Fig. 3 shows the same operating state. FIG. 4 is a sectional view of a main part. 1...Machine frame body, 3...Main boom, 5
...Drilling packet, 6...Base, 7
......Mounting bracket, 10...Hydraulic cylinder, 11...Bottle hole, 12...Protrusion, 1
3...Bottle hole, 14...Protrusion, 3o...
Open frame, 33...protrusion.

Claims (1)

[Scope of utility model registration request] The base 6 of the main boom 3, on which the excavation packets 5 are connected, is pivoted to a mounting bracket 7 so as to be able to move up and down freely, and the mounting bracket 7 is provided protruding from the front end of the machine frame body 1, and is capable of swinging in the left and right directions. In a movably pivoted backhoe, the mounting bracket 7
Protrusions 12 and 14 are integrally extended in the left and right direction, and fixing pins 21 are fitted into these protrusions 12 and 14 to be fixed by protrusions 16 on both left and right sides of the front end of the machine frame body 1, Bottle hole 1
1. Attach the main boom of a backhoe by drilling holes 13 and pivoting the tip of the hydraulic cylinder 10 provided in the machine frame body 1 at the protrusion 12 to a position closer to the machine frame body 1 than the position of the bottle hole 11. Metal fittings.