Fail-safe bed motion control circuit having a microprocessor
US5195198A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 3, 1992 |
| Grant date | Mar 23, 1993 |
| Priority date | — |
| Expiry date | Aug 3, 2012 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61G7/018
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A hospital bed has a movably supported part, a selectively actuable drive arrangement for moving the part, a manually actuable control switch, and a control circuit coupled to the switch and drive arrangement. The control circuit includes a microprocessor having an input coupled to the control switch and having an output, and the program executed by the microprocessor selectively actuates the output of the microprocessor based on a function which takes into account the current state of a signal being applied to the microprocessor input. The control circuit also includes a further arrangement which actuates the drive arrangement when the signals from the control switch and microprocessor are both actuated, and which deactuates the drive arrangement when either of these two signals is deactuated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.