HVAC damper
US6237630A · kind A · utility
Inventors
Key dates
| Filing date | Jul 13, 1999 |
| Grant date | May 29, 2001 |
| Priority date | — |
| Expiry date | Jul 13, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/87507
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A fail-safe HVAC damper apparatus comprises a duct channel with a closure comprising one or more quadri-panel hinged elements, each with four panels connected by four parallel hinge pins. A gear shaft with a toothed gear is controllably rotated to linearly drive a spring-biased plate to move one of the hinge pins of each quadri-panel element between an open and a closed position. A drive motor may be activated to open or close the closure, e.g. by a smoke detector or other controller. A meltable fuse in the duct channel may be connected to a disconnect which uncouples the gear shaft and toothed gear, and a spring moves the closure to a default closed or open position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.