Electricity: motive power systems – Automatic and/or with time-delay means
Reexamination Certificate
1999-11-12
2001-04-17
Ro, Bentsu (Department: 2837)
Electricity: motive power systems
Automatic and/or with time-delay means
C318S446000, C015S301000, C454S238000
Reexamination Certificate
active
06218798
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates generally to vacuum powered cleaning systems for buildings. More specifically, the present invention relates to central vacuum systems having an interface to an air exchanger.
Modern residential and commercial buildings, especially single family homes, are built to resist external weather conditions. Construction techniques and materials are chosen to seal buildings so that air exchange between the interior and the exterior of the building is minimized to reduce heating and cooling costs. As a convenience, many buildings are also provided with a central vacuum system used to clean floors and other surfaces in the building. Briefly, a central vacuum system includes a motor driven vacuum unit, vacuum ports located throughout the structure, duct work placed in the walls of the building to connect the vacuum unit to the vacuum ports and a user manipulable cleaning attachment which mates with the vacuum ports. The vacuum source is typically placed in a somewhat remote location, such as a garage. Electrical cabling can be installed with the duct work to provide an electrical connection between the vacuum unit and the cleaning attachment. Such an electrical connection is used to switch the vacuum unit on or off. Other electrical connections can be used to power a rotary brush mounted on the cleaning attachment.
As the central vacuum system operates, air is exhausted from the building. This depletes the air inside the building, especially in buildings that are well sealed to prevent air transfer between the interior and exterior of the building. Various ways to introduce air into buildings are known in the art of building ventilation. As an example, U.S. Pat. No. 2,725,113, incorporated herein by reference, discloses a central vacuum system where both a fresh air supply opening and a vacuum source opening are provided on panels throughout the building. When the central vacuum is operating, a common motor supplies fresh air and suction to the panel being used by an operator. However, this example system does not balance the air flow of exhausted air and fresh air.
Air exchangers, otherwise referred to as air to air heat exchangers or heat recovery ventilators, for providing a balanced flow of air into and out of a building are also known. For example, U.S. Pat. No. 5,257,736, incorporated herein by reference, discloses an air exchanger having a pressure sensor. If the sensor detects a negative pressure in the building, the air exchanger stops pumping air out of the building to balance the air pressure. Air exchangers typically provide a range of functions such as reducing air contamination, heating or cooling air entering the building, and/or humidifying or dehumidifying air entering the building. Accordingly, the air exchanger is usually connected to the rest of the building's ventilation system and operates independently of other appliances. Therefore, there are no provisions for an electrical connection between the central vacuum system and the air exchanger for controlling an air exchanger. Operation of the vacuum is determined by sensing the resulting pressure differentiation rather than by an electrical connection.
SUMMARY OF THE INVENTION
The present invention overcomes these disadvantages by providing a central vacuum cleaner system having a motor driven vacuum source which is selectively turned on or off. The central vacuum cleaner has an interface connector for establishing a connection between the central vacuum and an air exchanger. The interface connector is connected to be activated by the central vacuum when the motor is turned on so as to activate the air exchanger.
REFERENCES:
patent: 2431726 (1947-12-01), Bechtler
patent: 2725113 (1955-11-01), Fagyas
patent: 2979755 (1961-04-01), McCaskill
patent: 3635282 (1972-01-01), Watanabe
patent: 3849866 (1974-11-01), Mol
patent: 3951336 (1976-04-01), Miller et al.
patent: 4497362 (1985-02-01), Teague, Jr.
patent: 4991253 (1991-02-01), Rechsteiner
patent: 5173646 (1992-12-01), Reid
patent: 5257736 (1993-11-01), Roy
patent: 5902182 (1999-05-01), Kramer
patent: 5924163 (1999-07-01), Burns, Jr.
patent: 6131571 (2000-10-01), Lampotang et al.
Cunningham Vern
Johnson Douglas E.
Koestner Mitch
Price Tamara
Pearne & Gordon LLP
Ro Bentsu
White Consolidated Industries, Inc.
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