Master cylinder with return spring
US5560206A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 24, 1995 |
| Grant date | Oct 1, 1996 |
| Priority date | — |
| Expiry date | Apr 24, 2015 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60T11/20
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
An object of the present invention is to provide a master cylinder in which the buckling of spring is prevented and the packing is not damaged. To achieve this object, in a master cylinder in which a return spring is disposed between the end wall of a cylinder and a piston, and a packing fitted to the piston slides on the inner peripheral wall of the cylinder, the return spring 30 comprises a cylindrical large-diameter coil portion A with a diameter almost in contact with the inner peripheral wall of the cylinder 12 and a small-diameter coil portion B with a diameter enough smaller than the diameter of the inner peripheral wall of the cylinder 12, and the installation length of the small-diameter coil portion B is set so as to be nearly equal to a length of the range in which the packing 24 slides.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.