Wiper blade rubber
US4912803A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 31, 1983 |
| Grant date | Apr 3, 1990 |
| Priority date | — |
| Expiry date | Mar 31, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/30
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A wiper blade rubber provided with a surface layer containing more than 50% by volume of lubricative fine powder at least on the surface of a sliding portion thereof including a lip. The surface layer is integrally press-formed with the substrate of wiper blade rubber in one body so as to be vulcanized. The wiper blade rubber having such a surface layer is produced by a method according to the present invention which is characterized in that a starting article as the substrate of wiper blade rubber and a cavity provided in a separate mold used for this purpose has such a dimensional relationship therebetween that the thickness of the starting article at the center in the transverse section thereof is 0.9 to 1.0 times the thickness of the corresponding central portion of the cavity, where the lip of wiper blade rubber is defined. And the starting article has such a shape in the transverse section thereof that the central thin portion thereof is connected to the respective thick end portions thereof at an angle ranging from 20.degree. to 45.degree., which is defined by a line elongated along the central thin portion thereof and another line elongated along the connecting portion ther…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.