Water spray fire protection for hoods over cooking units
AssigneeGaylord Industries, Inc.
InventorsEdson C. Gaylord, David K. Black, Russell L. Anderson, Philip O. Morton
Life of this patent
Estimating the term…
Abstract
A water spray system applied directly to cooking units in a kitchen rather than to the ventilating duct for the cooking units. The system may be a wet system with water pressure maintained at spray nozzles which open in case of fire, or an open head, or dry, system controlled by thermostats and a solenoid water valve. Safeguards are provided against loss of water pressure, surges in the water supply line, flare ups after partial cooling of the thermostats, closing of a solenoid gas valve supplying gas burners in the cooking units as a result of momentary outages in the electric service supplying the control circuits, and other contingencies.
Claims17
A fire protection system for hoods over cooking units comprising a water spray nozzle under the hood arranged to spray water downward toward said cooking units, a hand valve for turning off the water supply for said spray nozzle;
- a normally energized operating condition signal light, a system not operational signal light, a fire condition signal light and audible alarm;
- fire responsive means under said hood arranged to respond to a fire on said cooking units and actuate said spray nozzle;
- means responsive to the operation of said spray nozzle to turn off both said operating condition signal light and an energy supply for said cooking units and turn on said fire condition signal light and audible alarm;
- and a manual reset switch arranged to turn on said operating condition signal light and said energy supply for said cooking units and turn off said fire condition signal light and audible alarm, a valve switch actuated by turning said hand valve to off position and a water pressure switch actuated by low pressure in said water pressure system;
- and means operated by said actuation of said valve switch or pressure switch to turn off said operating condition signal light and said energy supply for said cooking units, turn on said audible alarm and flash said system not operational signal light on and off continuously, a manual bypass test switch arranged to make said valve switch and water pressure switch ineffective, said signal lights, test switch and hand valve being mounted in a cabinet having normally closed doors, said test switch and valve being arranged to prevent the closing of said doors when said test switch is in test position and said valve is in closed position.
A fire protection system for cooking equipment comprising a water spray nozzle arranged to spray water on said equipment, a water pressure system arranged to supply said nozzle, fire responsive means arranged to respond to a fire on said cooking equipment and actuate said spray nozzle, means responsive to the operation of said spray nozzle to turn off an energy supply for said cooking equipment, a hand valve for turning off said water supply, a valve switch actuated by said hand valve, a pressure switch actuated by low pressure in said water supply, a reset switch arranged in a control system to restore said energy supply for said cooking equipment after the fire has been extinguished, and circuit means in said control system connected with said valve switch and pressure switch to prevent restoration of said energy supply for said cooking equipment while said hand valve is closed or low pressure exists in said water supply, a solenoid gas valve in a gas line supplying said energy for said cooking equipment, and a time delay relay continuously energized directly from the supply wires for said control system and arranged to shunt said reset switch for a short interval during a power interruption in said supply wires, to re-energize and re-open said solenoid valve if power is restored to said supply wires during said interval, said solenoid valve having a slow closing action to maintain a flow of gas to said cooking equipment during said interval.
A fire protection system for cooking equipment comprising a water spray nozzle arranged to spray water on said equipment, a water pressure system arranged to supply said nozzle, fire responsive means arranged to respond to a fire on said cooking equipment and actuate said spray nozzle, means responsive to the operation of said spray nozzle to turn off an energy supply for said cooking equipment, a hand valve for turning off said water supply, a valve switch actuated by said hand valve, a pressure switch actuated by low pressure in said water supply, a reset switch arranged in a control system to restore said energy supply for said cooking equipment after the fire has been extinguished, and circuit means in said control system connected with said valve switch and pressure switch to prevent restoration of said energy supply for said cooking equipment while said hand valve is closed or low pressure exists in said water supply, a solenoid gas valve in a gas line supplying said energy for said cooking equipment, and a small bypass gas line around said solenoid valve to maintain a reduced flow of gas to gas burners in said cooking equipment during intervals when said solenoid valve is closed.
A fire protection system for cooking equipment comprising a water spray nozzle arranged to spray water on said equipment, a water pressure system arranged to supply said nozzle, fire responsive means arranged to respond to a fire on said cooking equipment and actuate said spray nozzle, means responsive to the operation of said spray nozzle to turn off an energy supply for said cooking equipment, a hand valve for turning off said water supply, a valve switch actuated by said hand valve, a pressure switch actuated by low pressure in said water supply, a reset switch arranged in a control system to restore said energy supply for said cooking equipment after the fire has been extinguished, circuit means in said control system connected with said valve switch and pressure switch to prevent restoration of said energy supply for said cooking equipment while said hand valve is closed or low pressure exists in said water supply, and a manual bypass test switch arranged to make said valve switch and water pressure switch ineffective, said test switch and hand valve being mounted in a cabinet having normally closed doors, said test switch and valve being arranged to prevent the closing of said doors when said test switch is in test position and said valve is in closed position.
Dependencies are inferred from the claim text.