Structure for working unit for bucket excavators and method for manufacturing the same
US6349489B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 18, 2000 |
| Grant date | Feb 26, 2002 |
| Priority date | — |
| Expiry date | Jan 18, 2020 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE02F3/38
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An arm body of a working machine has a hollow and triangular cross-section. A bucket-connection bracket is jointed to one longitudinal end of an arm body, and an arm cylinder bracket is jointed to another longitudinal end of the arm body, thereby forming an arm. With the triangular cross-sectional structure, the arm body is less prone to deformation under the stress of a load. The improved triangular cross-sectional structure permits the plate thickness of the arm body to be reduced, and the rigidity of the arm body to be increased without mounting a cross-section restraint material in the arm body. The cross-section of the boom will not deform even though the plate thickness is reduced. Therefore, it is possible to reduce the weight of the boom and still prevent deformation of the boom under heavy load. A method of producing an arm body is efficient and simplified since a single sheet of metal may be formed into a triangular shape, with a single welded seem being formed at the seem between abutting edges of the metal material. The various corners of the triangular cross-section may be arc shaped or flat as is desired.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.