Ventilation – Having inlet airway – Including automatic control means
Reexamination Certificate
1999-05-12
2001-04-24
Joyce, Harold (Department: 3749)
Ventilation
Having inlet airway
Including automatic control means
C405S036000, C454S338000
Reexamination Certificate
active
06220957
ABSTRACT:
FIELD OF THE INVENTION
The invention pertains to the field of air handling devices. More particularly, the invention pertains to a reversing shuttle for an air handling device that reverses air flow in part of the device.
BACKGROUND OF THE INVENTION
In a system for treating soil and turf by blowing and/or vacuuming through a duct network located underneath the turf, a low-pressure high-volume fan is typically used to move air into the soil profile or suck moisture out of the soil profile. U.S. Pat. Nos. 5,433,759; 5,507,595; 5,542,208; 5,617,670; 5,596,836; and 5,636,473 show different variations on equipment used for this purpose. Since a non-reversing fan always rotates in the same direction, changing the system from a blowing function to a vacuuming function requires disconnecting the duct network from the blowing outlet of the fan unit and connecting it to the vacuum inlet of the unit. In some variations, a 4-way valve is used to avoid the hassles involved with selectively connecting and disconnecting the duct network from the various ports of the fan unit.
SUMMARY OF THE INVENTION
Briefly stated, a fan unit has inlet and outlet ducts facing in the same direction. A reversing shuttle is connected to the inlet and outlet ducts of the fan unit and includes a diverter damper and two opposing dampers. The reversing shuttle further includes an outlet that is connectable to a duct network that is under a sports field or portions of a golf course. When the fan unit is running, depending on how the opposing dampers and diverter damper are positioned, air is either blown into the duct network, thereby causing air and possibly other additives to enter the soil profile of the field, or sucked (vacuumed) from the duct network, thereby draining moisture through the soil profile and into the duct network. Moving the diverter damper from a first position to a second position while changing which of the opposing dampers is open and which is closed reverses the air flow in the duct network.
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Brown & Michaels PC
Joyce Harold
SubAir, Inc.
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