Power arm fitted with coupling devices for a member provided to control its position
US4297815A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 12, 1979 |
| Grant date | Nov 3, 1981 |
| Priority date | — |
| Expiry date | Dec 12, 1999 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE02F9/006
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The invention relates to a power arm comprising four faces, two of which being constituted by plates, which arm is mounted for pivotment about an axis and with respect to a structure, and is fitted with the coupling lug of a jack comprising a pivoting axis of said jack and its support, permitting a deflection of said jack which is parallel to the deflection of the arm, said support being constituted by extended portions of the plates. The arm comprises a cross piece of which the length 1 is substantially equal to the spacing between the said extended portions and which is situated between the said extended portions, and transversed by the axis, a threaded end of which cooperates with a nut to hold the cross piece in position between the said extended portions. An application is found in the production of a shovel boom.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.