Check rail lock
US4801164A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 30, 1987 |
| Grant date | Jan 31, 1989 |
| Priority date | — |
| Expiry date | Apr 30, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T292/1091
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A check rail lock having a housing with an interior space which rotatably mounts a shaft connected to a handle and a cam and with stop members associated with the cam and the housing for limiting rotation of the cam between locked and unlocked positions. The cam is releasably held in either of these positions by mounting of a spring washer on the shaft to which the cam is fixed, and with the spring washer and the housing having coacting detent structure which releasably holds the cam in either the locked or unlocked position. The spring is generally concave for predetermined spring loading and has planar sections with detents to assure good engagement with detent notches on the housing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.