Hand-operated hardness meter
US4444045A · kind A · utility
Inventor
Key dates
| Filing date | Mar 12, 1982 |
| Grant date | Apr 24, 1984 |
| Priority date | — |
| Expiry date | Mar 12, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N3/42
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The hardness meter is so designed as to render the applied measurement load independent from the force that the operator is capable to exhert and as to provide an instantaneous load permitting a precise measure even if the equipment is shifted during the operation. Such hardness meter includes, between the mobile structure operated by the user's hands and the penetrating pin, a device capable of exherting an instantaneous force on the penetrating pin. This device is formed by a plated spring (49) carried by an inertia mass (45) sliding along the guiding columns (10 and 11) and presenting a convexity which may be released from one side to the other of the median plane; when it is arranged on one side of the plane it is loaded and when it turns to the other side provides the instantaneous force which throws along said columns the inertial mass braked, however by friction means (50, 51 and 52) thus preventing the discharge of the reaction forces against the operator's hands.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.