Vehicle window wipers with dynamic symmetrical overlap
US4900996A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 26, 1989 |
| Grant date | Feb 13, 1990 |
| Priority date | — |
| Expiry date | Jun 26, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S318/02
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A pair of wiper blades on a vehicle window are oscillated in opposing movement between an overlapping inner wipe arrangement, in which one of the blades overlaps the other, and separated outer wiper positions. In dynamic symmetrical overlap (DSOL) operation, the first blade during each cycle to reach its outer wipe position is brought back first to be overlapped by the other for the start of the next cycle. This will normally produce alternating symmetrical overlap (ASOL) operation with its advantages of lower maximum blade acceleration and stress, since the overlapping blade precedes the other on the way out. However, if the leading blade is occasionally slowed, the other blade will not be forced to wait in its outer wipe position; and the cycle time will be minimized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.