Scraper bowl with hydraulic safety lock
US3947981A · kind A · utility
3Cited by
4References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 9, 1974 |
| Grant date | Apr 6, 1976 |
| Priority date | — |
| Expiry date | Dec 9, 1994 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE02F3/652
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Frame-drawn scraper having a bowl with hydrospring suspension and hydraulic pump, comprising: bowl raise-lower means disposed between and connecting the scraper draft frame and bowl; and an intervening hose, accumulator, and motion sensitive blocking safety valve connected in circuit in that order from the pump to the bowl means, responsive to extreme lowering movement of the bowl if the hose ruptures, to hydraulically lock the bowl from farther lowering by automatically blocking the circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.