Vacuum brake booster
US4233884A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 9, 1979 |
| Grant date | Nov 18, 1980 |
| Priority date | — |
| Expiry date | Apr 9, 1999 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60T13/577
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
In prior art vacuum brake boosters embodying a two-stage reaction, the magnitude of the two-stage reaction is limited because of the small space available for the reaction-delaying spring. Moreover, the lost motion present in the reaction lever mechanism has to be overcome when the braking operation is initiated. These disadvantages are overcome in a vacuum brake booster including a reaction mechanism constructed in accordance with the present invention wherein the reaction-delaying spring is positioned on the side of the reaction levers adjacent the vacuum chamber and by having the point of contact of the spring on the reaction levers at a greater radius than the point at which the levers are in engagement with the movable wall.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.