Working machine with improved jib section
US4355477A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 20, 1981 |
| Grant date | Oct 26, 1982 |
| Priority date | — |
| Expiry date | Mar 20, 2001 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE02F3/966
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A working machine which is intended for demolishing and excavating work comprises a chassis, an upper part carried by said chassis and arranged for rotational movement relative thereto about a vertical axis, and an arm arrangement carried by the upper part and including a jib structure which is connected at one end thereof to the upper part and the other end of which carries, via an intermediate arm, a fitting for a tool, such as an excavator bucket, a chiseling device or like tool. The jib structure and the intermediate arm are connected to the upper part and to each other respectively via pivots and can be pivoted in a vertical plane by means of first and second pressure piston-cylinder devices active between the upper part and the jib structure and between the jib structure and the intermediate arm respectively. The jib structure is divided into a first, short jib section which is pivotally connected to the upper part, and a second, longer jib section which is pivotally connected to the first jib section. The first jib section is connected to the first pressure cylinder device, while the second jib section is connected to the second pressure cylinder device. Further, the jib sec…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.