Automatic stack damper
US4039123A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 19, 1975 |
| Grant date | Aug 2, 1977 |
| Priority date | — |
| Expiry date | Aug 19, 1995 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF23N2225/02
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
An improvement in a system comprising a heat stack, a damper having a vane in said heat stack, actuating means for opening and closing said damper, the actuating means being electrically connected to and responsive to a thermostat in an electrical circuit containing the heating means for generating heat, the by-products from which pass through the heat stack, the improvement residing in that the actuating means comprises an electric motor which is spring biasedly connected to the vane, the electric motor being in a normally "On" position having current passing therethrough and holding said vane against the action of said spring in a closed position. Means are provided to deactivate the motor and allow the spring to return the vane so that the stack is in an open position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.