Sweep frequency vibrator
US5331607A · kind A · utility
Inventor
Key dates
| Filing date | Feb 23, 1993 |
| Grant date | Jul 19, 1994 |
| Priority date | — |
| Expiry date | Feb 23, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V1/155
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A sweep frequency vibrator is set forth. It has an elongate cylindrical housing closed at the top and bottom ends. On the interior, there is a reactionary mass fixed to identical upper and lower piston ends. They are received in seal isolated chambers, one being formed in a moveable plug. The plug is moved to thereby vary the spacing of the chambers. As the frequency is changed, plug is moved to assure sufficient clearance from the excursion of the reactionary mass. Hydraulic oil under pressure is delivered to control valves, one for each piston end. The two control valves and piston ends have very short flow lines. Moreover the excursion permitted for the plug assures operation without bottoming out.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.