Hydraulic excavator
US4301607A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 11, 1980 |
| Grant date | Nov 24, 1981 |
| Priority date | — |
| Expiry date | Apr 11, 2000 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE02F3/425
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A hydraulic excavator comprising a vehicle, a boom pivotally connected at one end to the vehicle, a stick pivotally connected at one end to the other end of the boom, a bucket pivotally connected to the other end of the stick. A bucket attitude maintaining arrangement is provided to maintain a substantially fixed preselected attitude of the bucket with respect to the ground upon movement of the stick about its pivotal connection to the boom. The bucket attitude maintaining arrangement includes a lever pivotally mounted at one end to the stick and a compensating cylinder pivotally connected at one end to the stick and at the other end to the lever.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.