Pressure plate for mines, in particular anti-tank mines, and mine comprising same
US4718347A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 27, 1987 |
| Grant date | Jan 12, 1988 |
| Priority date | — |
| Expiry date | Jan 27, 2007 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF42C7/06
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A pressure plate for a mine comprises a hydraulic circuit. The mine is triggered by complete depression of the pressure plate. The hydraulic circuit comprises a pressure chamber containing a fluid that is compressed by a force applied to the pressure plate. The fluid is evacuated from the pressure chamber in a controled manner through a depressurization unit in response to a sustained force greater than a predetermined threshold being applied to the pressure plate. A bistable member moves between a first position in which it prevents communication between the pressure chamber and the depressurization unit and a second position in which it establishes communication between the pressure chamber and the depressurization unit. The bistable member is initially in the first position when no force is exerted on the pressure plate. It remains in the first position so long as the pressure plate is subjected to an increasing or stable force. It switches to the second position when the pressure of the fluid decreases after it has increased due to a force of this kind. Thus, after increasing to a maximum value and then decreasing to a minimum value, any increase in the force results in depress…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.