JPH044053Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a power shovel used in construction work and civil engineering work, and more specifically, to a power shovel that has an expanded scope of work when demolishing buildings.

[Conventional technology]

Power shovels were originally used in the architecture and civil engineering fields.
It has been developed to perform excavation work, and an example thereof is shown in FIG. 6 and will be explained.

The power shovel includes a main body 1 having a turning table, a boom 2 bent in an F-shape, an arm 3 that can be exchanged to various lengths, and a bucket or crusher 4. Base end 2a of main body 1 and boom 2
are pivotally connected, and the tip 2b of the boom 2 and the arm 3
The proximal end 3a of the arm 3 is pivotally connected to the distal end 3a of the arm 3.
b and the crusher 4 are pivotally connected to each other, and hydraulic cylinders 5 are connected to each other.

As the piston rod 5a of the hydraulic cylinder 5 expands and contracts, the boom 2, the arm 3, the bucket or the crusher 4 are lifted up, and excavation work or the like is performed.
During excavation work, the bucket 4 is attached to excavate the ground. At this time, the boom 2 is bent downward in an F-shape so that the bucket 4 can excavate deep underground.

However, when the power shovel is used for building demolition work, the crusher 4 is attached and the main body 1
Crush the object above. Therefore, if the boom 2 is bent downward in an F-shape, it is disadvantageous when crushing objects at high places.

On the other hand, if boom 2 is manufactured for the above two purposes,
It's cumbersome and expensive.

A power shovel for solving the above-mentioned problems is disclosed in Japanese Patent Laid-Open No. 60-238530.

In this power shovel, the boom 2 is divided near the bent portion, and a triangular block-shaped distance piece is detachably attached to the divided portion. When the distance piece is attached, the boom 2 extends and contracts linearly, and the crusher a
This is advantageous for crushing objects above, and when the distance piece is removed, the boom 2 bends in an F-shape, making it advantageous for digging deep underground with the bucket 4.

[The problem that the idea attempts to solve]

The distance piece is a triangular block shape that extends the boom 2, which is bent in an F-shape, in a straight line, and is actually heavy at 200 kg. Therefore, it could not be installed manually, and a crane was used for installation, resulting in poor workability.

In addition, the distance piece and the boom are separated by forming a flange at both connecting parts, and are fastened together with a large number of bolts, which makes the fastening work complicated.

Furthermore, it is not easy to form a complicated flange on the distance piece, which is one of the causes of increased costs.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a power shovel whose F-shaped boom can be easily extended linearly.

[Means to solve the problem]

In order to achieve the above purpose, a F-shaped boom whose base end is pivotally mounted on the power shovel body, whose base end is pivotally mounted to the tip of the boom, and a crusher is pivotally attached to the tip. The first idea is to divide the bent part of the F-shaped boom into a proximal boom and a distal boom, and screw the outer sides of both booms with pins. The second idea is to separate the bent part of the F-shaped boom and create a proximal boom and a distal boom. The outside of both booms are screwed together with pins, and a hydraulic cylinder is connected to the inside of both booms.

[Effect]

According to the first invention, when a long rod is connected to the inside of a divided F-shaped boom, the boom extends linearly, and when a short rod is connected, or when no rod is connected, The boom bends in an F-shape.

According to the second invention, when the hydraulic cylinder connected to the inside of the divided F-shaped boom extends, the boom extends linearly, and when the hydraulic cylinder retracts, the boom expands into a F-shaped boom. bend.

[Embodiment 1] An embodiment of a power shovel according to the first invention will be described with reference to FIGS. 1 to 3.

However, parts that are the same as those in the prior art are given the same reference numerals, and their explanations will be omitted.

The boom 20 of this power shovel has a bending portion 2
The arm 3 is divided into two parts: a proximal end boom 21 which is pivoted to the main body 1, and a distal end boom 22 to which the proximal end 3a of the arm 3 is pivoted. Both booms 21, 2
A boss receiving part 21a and a boss part 22a are provided protrudingly on the outside of the abutment part 1, and both 21a and 22a are connected to the pin 2.
3, and boss receiving parts 21b and 22b are provided protrudingly on the inside of the abutting part, respectively, and the boss receiving parts 21
Connect the rod 10 to b and 22b. rod 10
As shown in FIG. 3, it is composed of a pair of bossed rods 11, 11 and an intermediate rod 12 connected between the bossed rods 11, 11. The bossed rod 11 is composed of a boss portion 11a and a flange portion 11b, and the pair of boss portions 11a are attached to the boss receiving booms 21b and 22b of the proximal boom 21 and the distal boom 22, respectively, using pins 13 and 13. Screw on. The intermediate rod 12 has a pair of flange portions 12.
a, 12a, and a leg portion 12b standing between the flange portions 12a, 12a. Leg 1
Since 2b can be manufactured in various lengths,
By replacing intermediate rod 12, rod 1
The length of 0 can be adjusted. The flange portion 11b of the bossed rod 11 and the flange portion 12a of the intermediate rod 12 have continuous bolt fastening holes 11.
c, 12c, both flanges 11b, 12a
are fastened with bolts (not shown).

When the long intermediate rod 12 is fastened, as shown in FIG. The booms 21, 22 extend linearly. Therefore, it becomes possible for the crusher 4 to rise to a high place. When the intermediate rod 12 is not fastened, the base end boom 21 and the distal end boom 2
The opposing surfaces of 2 abut against each other, and a pair of bossed rods 11,
The flange portions 11a, 11a of No. 11 are fastened with bolts. Then, as shown in Figure 2, boom 2
0 is bent into an F-shape.

Note that even the long intermediate rod 12 weighs about 50 kg, and if the arm 3 and crusher 4 are placed on the ground and the boom 20 is laid down, the rod 10 can be easily installed by hand without using a crane. be able to.

[Embodiment 2] An embodiment according to the second invention will be described with reference to FIG. 4. However, parts that are the same as those of the prior art and the first embodiment are given the same reference numerals, and their explanations will be omitted.

This boom 20 also has a bent portion 20a divided into a proximal end boom 21 and a distal end boom 22, and has a boss receiving portion 21a and a boss portion 22a on the outside of the abutting portion.
are provided protrudingly, and both 21a and 22a are screwed together with a pin 23. On the other hand, boss receiving parts 21b and 22b are provided on the inner side of the abutting part, respectively, and these both 21b,
A hydraulic cylinder 14 is pivotally mounted between 22b to connect the proximal boom 21 and the distal boom 22.

When the piston rod 14a of the hydraulic cylinder 14 is extended, as shown in FIG. 20 extends in a straight line. Therefore, it becomes possible for the crusher 4 to rise to a high place.

When the piston rod 14a of the hydraulic cylinder 14 is retracted, the abutment surfaces of the proximal boom 21 and the distal boom 22 come into close contact, and the boom 10 is bent into an F-shape.

The boom 20 is divided into a proximal boom 21 and a distal boom 22, and a boss receiving portion 2 is provided at the abutting portion.
1a, 21b, 22b and the boss portion 22a, as shown in FIG.
An intermediate boom 24 is connected between 1 and 22 with a pin 25, making it possible to extend the boom 20.

[Effect of idea]

According to the power shovel according to claim 1, since the divided booms are connected by a rod that is much lighter than a conventional distance piece,
The workability of extending the boom is improved, and the simple shape of the rod facilitates manufacturing, making it possible to reduce the cost of the power shovel.

According to the power shovel according to the second aspect, since the divided booms are connected by a lightweight hydraulic cylinder, the workability of extending the boom is improved, and the boom can be extended and retracted by extending and contracting the piston rod of the hydraulic cylinder. Since it can be bent, its versatility in the field is improved.

[Brief explanation of drawings]

Fig. 1 is a side view of the power shovel according to the invention as claimed in claim 1, Fig. 2 is a side view similarly showing different operating states, Fig. 3 is an exploded perspective view of the rod which is also a component, and Fig. 4 is the claim. FIG. 5 is a side view of a power shovel to which the invention of the present invention is applied, and FIG. 6 is a side view of a conventional power shovel. 1...Body, 3...Arm, 4...Crusher, 1
0... Rod, 11... Rod with boss, 12...
Intermediate rod, 20...boom, 21...base end boom, 22...distal end boom, 23...pin.

Claims (1)

[Claims for Utility Model Registration] (1) An F-shaped boom whose base end is pivotally attached to the main body of a power shovel, and whose base end is pivotally attached to the tip of the boom, and which is crushed at the tip. In a power shovel equipped with an arm to which the machine is pivotally connected, the bent part of the F-shaped boom is divided into a proximal boom and a distal boom, and the outsides of both booms are screwed together with pins. , inside both booms,
A power shovel characterized by connecting rods that can be exchanged for long or short lengths. (2) An F-shaped boom whose base end is pivotally mounted on the power shovel body, and an arm whose base end is pivotally mounted to the tip of the boom and a crusher is pivotally attached to the tip. In the power shovel equipped with the above, the bent part of the F-shaped boom is divided into a base end boom and a distal end boom, the outsides of both booms are screwed together with pins, and the insides of both booms have a A power shovel characterized by connected hydraulic cylinders.