Device for discontinuing and automatically restoring the operational function of a spring brake actuator
US3994206A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 10, 1975 |
| Grant date | Nov 30, 1976 |
| Priority date | — |
| Expiry date | Dec 10, 1995 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60T17/086
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A manual disconnecting device is provided for disengaging the brake push rod in a spring brake actuator having a movable piston holding the spring compressed by fluid pressure during normal operation. The device once manually disconnected is automatically reconnected upon a normal spring compression stroke of the piston. The disconnecting device provides a clutching device between the piston and the push rod engaging a nut threaded on the push rod with non-self-locking threads. In one embodiment the nut us journalled in the piston. In another embodiment there are clutch surfaces on both the piston and nut which are disengaged by a rotary motion from a special tool.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.