System for testing firmness
US4140008A · kind A · utility
25Cited by
3References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 27, 1977 |
| Grant date | Feb 20, 1979 |
| Priority date | — |
| Expiry date | Dec 27, 1997 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA47C31/123
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A system for measuring or testing the firmness of a resilient object such as a mattress. A pressure applying platen or the like is driven by a motor into the object, and the pressure applied is measured through the utilization of a pressure sensitive transducer or the like. This generates electrical power proportional to the pressure, and a recorder displays information to provide a reading of the power generated. The generating means is also connected to control means for the motor, and a threshold circuit or the like is adapted to shut off and reverse the motor when the power generated reaches a predetermined level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.