Apparatus and method for controlling barrier movement
US8100163B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 16, 2008 |
| Grant date | Jan 24, 2012 |
| Priority date | — |
| Expiry date | May 5, 2029 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE06B2009/807
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An apparatus for controlling the movement of a barrier is provided. The apparatus includes a governor with a preload member. The preload member provides a preload force that releasably and magnetically couples the preload member to the governor. The preload member is configured and arranged to provide a sufficient holding force to the governor in order to hold the barrier in place. The governor is configured and arranged to, upon the preload force being selectively decoupled from the preload member, allow for the downward movement of the barrier while also forming and applying an intentional braking force to the barrier to slow the downward movement of the barrier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.