Drying and gas or vapor contact with solids – Apparatus – For hair on head
Reexamination Certificate
2000-01-07
2001-08-07
Gravini, Stephen (Department: 3749)
Drying and gas or vapor contact with solids
Apparatus
For hair on head
C034S101000
Reexamination Certificate
active
06269549
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates generally to devices for drying the hair. More particularly, the present invention relates to hair dryers having a hood within which the user's head is placed.
DESCRIPTION OF THE PRIOR ART
Devices for drying the hair are well known in the art. It is also known in the art to provide hair dryers having hoods or bonnets that serve to direct the heated air used to dry the hair and scalp. The term hood is used herein to describe a rigid, dome-shaped receptacle that has a double-walled construction, wherein the inner wall has one or more air-discharge apertures.
Typically, a hood-type hair dryer includes a motor-driven fan unit for creating an air flow within the hair dryer, a device for heating the airflow (e.g., a heating coil), a hood within which the user's head is positioned, and a conduit directing the heated airflow into the hood.
The amount of time needed to dry a given amount of hair varies as a function of the both the temperature and volume of the air delivered by the hair dryer. The temperature of the air delivered by a hair dryer is limited by the comfort of the user to about 150° F., since experience shows that temperatures above 150° F. cause the hair that dries first to become uncomfortably warm while the user waits for the remaining hair to dry. On the other hand, the temperature of the air should be at least about 100° F. in order to provide an acceptable drying time.
The flow rate of the air delivered by a hair dryer is a parameter that is given considerable attention. Some methods for increasing flow rate are more effective than others. For example, enlarging the air inlet to the fan does not correspondingly increase the flow rate of air delivered by the fan because larger air inlets create more turbulence in the airflow. Moreover, practical constraints, such as size and weight, limit the flow rate of air that a hair dryer can deliver.
Thus, there remains a need for a hair dryer that increases the volume of delivered air, while maintaining comfort and convenience for the user.
Accordingly, it is an object of the present invention to provide a device for drying hair.
It is another object of the present invention to provide a hair drying device that can deliver an increased flow rate of air.
It is still another object of the present invention to provide a hair drying device that can deliver increased air volume and that allows that user to conveniently adjust the volume of air actually delivered.
It is a further object of the present invention to provide a hair drying device that is portable.
SUMMARY OF THE INVENTION
A hair dryer incorporating the invention includes a hood, two staggered or asymmetrically placed fans in a base, and an airflow conduit therebetween. The hood of the device may also have an adjustable vent for regulating the amount of air delivered to the head. Moreover, the hood may be secured to the base so as to close the device into a compact form for carrying and storage.
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patent: 4118874 (1978-10-01), Morane
patent: 4413428 (1983-11-01), Roos
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Carlucci Vito
DaCosta Sergio
Taylor Harold R.
Conair Corporation
Gravini Stephen
Ohlandt, Greeley, Ruggerio & Perle, LLP
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