Anchor torque controller for anchor installing machines
US5570577A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 11, 1995 |
| Grant date | Nov 5, 1996 |
| Priority date | — |
| Expiry date | Sep 11, 2015 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B44/04
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A torque controller which limits the output of a hydraulic motor is provided. The torque controller includes a by-pass circuit which allows the hydraulic fluid in the hydraulic fluid circuit to by-pass the motor. A valve manifold is placed in the by-pass and includes a main chamber having a main valve member and one (and preferably two or more) poppet valves in communication with the main chamber. The pressure at which the poppet valves and the main valve open are individually adjustable and are set for different pressures. Inlets to the poppet valves are closed with electrically operated solenoids such that the inlet to a selected poppet valve can be opened to activate that poppet valve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.