Retractable pantograph for downward withdrawal in the event of an abnormal frontal load
US4413710A · kind A · utility
1Cited by
1References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 10, 1981 |
| Grant date | Nov 8, 1983 |
| Priority date | — |
| Expiry date | Jun 10, 2001 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60L2200/26
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A movable structure for supporting a current-collector bow is pivotally mounted on a frame and lifted by means of a spring attached to the structure and to the frame. Upper members of the bow support structure permit displacement of the bow independently of the structure. Hook-engagement means or valve units are provided for neutralizing the lifting spring and transmission means are provided for connecting the bow-displacement means to the spring-neutralizing means. A load limiter inhibits the bow-displacement means below a predetermined load threshold value and releases the bow above this value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.