Post driving machine
US4124081A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 8, 1976 |
| Grant date | Nov 7, 1978 |
| Priority date | — |
| Expiry date | Apr 8, 1996 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B7/028
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An improved portable hydraulically powered driving machine, for driving posts, ground anchors, concrete breakers, core drills, and the like work pieces into the ground, pavements or wall structure, has a tower in the form of a stanchion carried by an extensible pedestal mounted boom rig on a mobile base such as a conventional truck and in its working position is adapted to rest on the ground, pavement or wall structure at a controlled attitude relative thereto to guide a hydraulically powered hammer and hold an anvil against the work piece and, in its transporting position is adapted to be secured horizontally at a low level in a truck-mounted frame. The stanchion down-crowds the hammer guide to load a compression spring which maintains the anvil continuously against the work piece even after the impact force of the hammer blow is expended and the work piece advances a considerable distance. The hammer is also spring-loaded, a hydraulic jack lifts the hammer and stretches the spring and the stroke of the hammer together with the rapidity of the hammer blows is controlled by a rotating dump valve for the jack. The speed of rotation of the dump valve is controlled by the machine oper…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.