Piston for disc brakes
US4928579A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 8, 1985 |
| Grant date | May 29, 1990 |
| Priority date | — |
| Expiry date | Apr 8, 2005 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16D2125/06
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An improved disc brake plastic piston is described which has a metallic cap or face which provides a means of attaching a brake shoe or a brake shoe assembly, or provides a dust boot groove, or, in a most preferred mode, the metallic cap component provides both a brake shoe retaining means and a dust boot groove. The piston is comprised of a cylindrical plastic body having an open end and a closed end. At least one ring bead can extend from the wall of the piston body contiguous to, or near, the open end. A metallic cap extends over the end wall of the open end of the cylindrical body and is secured to the body by being snap fit or clamped over the ring bead. Alternative means for anchoring the metallic cap are provided, such as by crimping the interior lip of the metallic cap or by providing threads on the internal or external walls of the piston adjacent to the open end of the piston, and corresponding or matching threads on the metallic cap.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.