Parallel linkage-type working apparatus for construction equipment

Patent metadata

Field	Value
Publication number	US-9447560-B2
Application number	US-201214369062-A
Country	US
Kind code	B2
Filing date	Dec 24, 2012
Priority date	Dec 27, 2011
Publication date	Sep 20, 2016
Grant date	Sep 20, 2016

Abstract

The present disclosure relates to a parallel linkage-type working apparatus for construction equipment in which a parallel lever and a parallel link operate to prevent a working tool from bending inward so that, even if the working tool is raised, a tilting phenomenon in which the working tool is inclined inward may be prevented, and an amount of change in posture of the working tool at each height may be reduced. Also, the parallel linkage-type working apparatus is capable of increasing excavation ability or power with a posture on the ground surface by supplying a larger amount of hydraulic fluid at one time when working hydraulic pressure is supplied to each cylinder head, in comparison with a case in which working hydraulic pressure is supplied to a cylinder rod.

First claim

The invention claimed is:

1. A parallel linkage-type working apparatus for use with construction equipment, comprising:
a base frame which is configured to connect to a front side of a traveling apparatus;
a lift arm which has one end configured to rotatably connect to the base frame, and the other end configured to rotatably connect to a bucket;
a lift cylinder which has one end configured to rotatably connect to the base frame, and the other end configured to rotatably connect to a central side in a length direction of the lift arm;
a parallel link which has one end configured to rotatably connect to the base frame;
a parallel lever which has a lower portion configured to rotatably connect to the other end of the parallel link;
a bucket cylinder which has one end configured to rotatably connect to an upper portion of the parallel lever;
a tilt lever which has an upper portion configured to rotatably connect to the other end of the bucket cylinder, and a lower portion configured to rotatably connect to the bucket through a push link configured to rotatably connect to the bucket; and
connecting shaft portions which have end portions configured to rotatably connect to a central side of the parallel lever, and the other end portions are configured to rotatably connect to a central side of the tilt lever;
wherein the parallel link and the parallel lever are configured to rotate relatively to each other in a direction in which a first hinge axis between the parallel link and the base frame and a second hinge axis between the parallel lever and the bucket cylinder move toward each other when the lift arm is raised without operating the bucket cylinder.

2. The parallel linkage-type working apparatus of claim 1 , wherein the connecting shaft portions include:
a fixed shaft which has both ends that are fixed to a pair of lift arms, respectively;
a first connecting shaft which has one end fixed to the fixed shaft, and the other end configured to rotatably connect to the central side of the parallel lever; and
a second connecting shaft which has one end fixed to the fixed shaft, and the other end configured to rotatably connect to the central side of the tilt lever.

3. The parallel linkage-type working apparatus of claim 2 , wherein a side cross section of the parallel lever has an isosceles triangle shape, and the parallel link, the bucket cylinder, and the first connecting shaft are configured to rotatably connect in the vicinity of vertices of the isosceles triangle shape, respectively.

Assignees

• Doosan Infracore Co Ltd
• Snu R&Db Foundation
• Doosan Infacore Co Ltd

Inventors

• Kim Hyuk Joong
• Yoo Young Sun
• Hwang Kyung Ho
• Kim Jong Won
• Han Yong Hee
• Kim Sun Ho
• Park Heung Keun

Classifications

• E02F3/3408 Primary

  of the parallelogram-type · CPC title

• E02F9/2271

  Actuators and supports therefor and protection therefor · CPC title

• E02F3/433

  horizontal, e.g. self-levelling · CPC title

• B66F9/065

  non-masted (mobile jacks of the garage type mounted on wheels or rollers B66F5/00) · CPC title

• E02F3/40

  Dippers; Buckets {; Grab devices, e.g. manufacturing processes for buckets, form, geometry or material of buckets (devices to connect tools to arms or booms E02F3/3604; teeth therefor E02F9/28)} · CPC title