Hydraulic spring vehicle barricade and hydraulic circuit therefor
US4850737A · kind A · utility
34Cited by
10References
25Claims
0Family size
Inventors
Key dates
| Filing date | May 4, 1988 |
| Grant date | Jul 25, 1989 |
| Priority date | — |
| Expiry date | May 4, 2008 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE01F13/08
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A vehicle barricade comprises a frame to which a barrier plate is pivotally mounted for being moved between a passage and a blocking position. First and second hydraulic motors operably interconnect the plate and the frame. An hydraulic power supply is operably connected with the hydraulic motors and includes an uninterrupted line for assuring constant power supply to the first hydraulic motor for thereby biasing the first hydraulic motor into extension and control valve means for selectively supplying power to the second motor for thereby causing selective pivoting of the plate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.