Power shovel having improved front end assembly
US4221531A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 6, 1978 |
| Grant date | Sep 9, 1980 |
| Priority date | — |
| Expiry date | Oct 6, 1998 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE02F3/382
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A power shovel comprising a support unit: a stiffleg operatively connected to the support unit for pivotal movement about a stiffleg pivot axis, the stiffleg comprising a pair of transversely spaced, longitudinally disposed side beams each having an I-shaped cross-sectional configuration including upper and lower flange portions and an interconnecting web portion, a cross-piece section interconnecting the side beam sections and a web section interconnecting the web portions of the side beam sections; a handle operatively connected to the stiffleg for pivotal movement about a handle pivot axis; a dipper mounted on the handle; a crowd system operatively connected to the handle for crowding and retracting the dipper; and a hoist system for hoisting and lowering the dipper comprising at least one upper fluid actuated rod and cylinder assembly operatively connected at a lower end thereof to the stiffleg and operatively connected at an upper end thereof to the handle on one side of the handle pivot axis, at least one lower fluid actuated rod and cylinder assembly operatively connected at a lower end thereof to the stiffleg and operatively connected at an upper end thereof to the handle o…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.