Double-acting accelerator for use with hydraulic drilling jars
US5232060A · kind A · utility
Inventor
Key dates
| Filing date | Aug 15, 1991 |
| Grant date | Aug 3, 1993 |
| Priority date | — |
| Expiry date | Aug 15, 2011 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B31/113
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A double acting accelerator 1 includes a mandrel 2 arranged in a housing 3 for sliding longitudinal movement. A pair of pistons 89, 111 are positioned radially between the housing 3 and mandrel 2 to form a substantially sealed chamber 88 longitudinally therebetween. Movement of the mandrel 2 in a first direction urges the first piston 89 toward the second piston 111, thereby greatly increasing the pressure of fluid in the chamber 88. Movement of the mandrel 2 in a second, opposite direction urges the second piston 111 toward the first piston 89 to, likewise, greatly increase the pressure of fluid in the chamber 88. Thus, a large amount of energy is stored in the accelerator 1 independent of the relative direction of movement of the mandrel 2 and housing 3.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.