Pumps – Motor driven – Electric or magnetic motor
Reexamination Certificate
1999-03-26
2001-10-30
Tyler, Cheryl J. (Department: 3746)
Pumps
Motor driven
Electric or magnetic motor
C416S24400R, C415S213100, C417S423800
Reexamination Certificate
active
06309192
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to an insulated box fan of the type wherein the motor is electrically insulated from the rest of the fan by an isolator ring.
2. Description of the Prior Art
Box fans are perhaps the most common fan in the industry. Historically, box fans are constructed of metal and plastic and are one of the least expensive fans, they provide a high volume of air, are of relatively light weight, are sturdy and long lasting, are versatile in that they can be placed on virtually any flat surface, and are stable and resist toppling.
With the use in fans of six pole motors and the increasing use of four pole motors, which use capacitors and consequent higher operating voltages, problems can arise if the fan is placed into a window, and the air being moved by the fan becomes moisture laden air, or if water comes directly onto the fan.
One of the problems from moisture laden air is that the water may provide a current leakage path to parts of the fan that come into contact with the user.
Box fans typically mount the motor, which has a metal outer casing, directly to vertical metal brackets in the fan, so that if the motor casing is electrically charged, the fan housing will also become charged, and present a hazard to the user.
The fan of the invention is designed to isolate the motor housing from the fan mounting brackets to prevent the fan housing from becoming electrically charged, and provides other positive advantages.
SUMMARY OF THE INVENTION
It has now been found that an insulated box fan is available, wherein the fan motor is electrically insulated from the fan housing by an isolator ring.
The principal object of the invention is to provide a box fan that has a fan motor that is electrically insulated from the fan housing.
A further object of the invention is to provide a box fan that is simple and inexpensive to construct.
A further object of the invention is to provide a box fan which maintains the mechanical and structural integrity of the metal bracket portion of the fan.
A further object of the invention is to provide a box fan wherein the basic fan housing structure is not modified, and which provides a slim streamlined box fan.
A further object of the invention is to provide a box fan that can be safely placed in a window.
A further object of the invention is to provide a box fan with improved air flow to the fan motor for better cooling.
Other objects and advantageous features of the invention will be apparent from the description and claims.
REFERENCES:
patent: 2867377 (1959-01-01), Lasko
patent: 3310698 (1967-03-01), Krell
patent: 4120615 (1978-10-01), Keem et al.
patent: 4636669 (1987-01-01), Plunkett et al.
patent: 5788566 (1998-08-01), McAnally et al.
patent: 5955955 (1999-09-01), Corcoran, Jr. et al.
patent: 6015265 (2000-01-01), Lasko et al.
Lasko Holdings Inc.
Tyler Cheryl J.
Wobensmith, III Zachary T.
LandOfFree
Insulated box fan does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Insulated box fan, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Insulated box fan will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2585019