Safety appliance for movable parts
US5734244A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 15, 1996 |
| Grant date | Mar 31, 1998 |
| Priority date | — |
| Expiry date | May 15, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H7/0851
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An appliance which, through motor-driven operation, is movable toward a closing edge, in particular, for use with window regulators and sliding roofs of automotive vehicles. For this purpose, the number of revolutions of the motor is permanently detected, with the number of revolutions of the motor being measured in successive measuring intervals. The number of revolutions is to be a measure of the force acting on the pane. Respectively the last four measured values are detected in a sliding register and are subjected to evaluation. For this purpose, first a start-up value is detected. The start-up value respectively is the third last measured value n.sub.i-3 if the difference D between the current measured value and the third last measured value does not exceed a predetermined differential threshold D.sub.max. For, in that case, the start-up value remains unchanged. Subsequently, the difference A is formed between the start-up value and the current value n.sub.i. If the latter is above a predetermined response threshold A.sub.max, the anti-clamping system responds. This means that the driving motor is turned off and, optionally, is inverted in the direction of rotation thereof. Mo…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.