Drying and gas or vapor contact with solids – Apparatus – For hair on head
Patent
1987-11-03
1990-01-02
Bennet, Henry A.
Drying and gas or vapor contact with solids
Apparatus
For hair on head
A45D 2006
Patent
active
048903957
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a hair dryer according to the preamble of the main claim.
The current state of the art includes hair dryers having either a gas tank and a complicated control and ignition mechanism or a heat accumulator provided with heating wires. Both versions have a high weight and complicated expensive components. They are awkward to handle and not very convenient for travelling.
Based on this state of the art, the object underlying the present invention is to design a hair dryer which is suitable for travelling, safe, light weight and simple, using a conventional disposable or quartz pocket lighter or an exchangeable gas tank.
In accordance with the invention, this object is accomplished by a hair dryer incorporating the feature of the main claim. In a hair dryer housing equipped with an intake and an exit vent as well as a battery-operated blower, an ordinary gas-operated pocket lighter or a gas tank constituting the heat-producing part is used. The lighter or the gas tank is to be inserted into the hair dryer housing through a recess such that the thumb pressure applied to the base causes actuation of the gas lever on the gas lever abutment tab, the gas lever incorporating both the igniting and the gas discharge functions. The lighter or gas tank serves at the same time for actuation of a switch, starting also the blower briefly before ignition takes place. The air guide plate received in the housing cooperates with the air baffle plate to form a connecting clearance between the receptacle and the airflow channel having a curve in the direction of the hot air exit nozzle. The gas burns in the connecting clearance in such a manner that, due to the supply of air or oxygen, an ideal combustion leaving no residues takes place. The resulting heating of the airflow is sufficient for drying the hair.
The hair dryer of the invention affords the following advantages and effects:
a. Safety, because it obviates the need for an electricity supply;
b. Independence of limited cord lengths and different electrical outlet versions in different countries; as a result, ready for use anywhere, as, for example, in the car, on campsites, beaches, etc.;
c. Dimensions hardly larger than a pack of cigarettes and low weight (prototypes weigh about 250 g, which is about 30% less than the weight of conventional travel dryers);
d. No need to wait until the air flow is heated; hot air is delivered promptly;
e. When the appliance is not in use, the lighter or the gas tank may be withdrawn to be employed as usual; with the lighter removed, the hair dryer is completely safe, even in the hands of children;
f. No flames emerging from the hot air exit nozzle because the supply of fresh air or oxygen reduces the size of the lighter flame to about one tenth of its original length, the flame burning ideally in the connecting clearance. Since the ignition process is initiated after the blower is turned on, the partial vacuum prevailing in the combustion chamber ensures a safe ignition by preventing detonations. Thus, the excess pressure normally resulting from the ignition of gas does not cause the gas flame to be extinguished;
g. As soon as the air exit nozzle of the hair dryer becomes blocked by hair or some other object, the flame will be extinguished immediately. This is accomplished in that the air which accumulates as a result of the blocked hot air exit nozzle blows the lighter flame out by flowing back through the connecting clearance. Thereby, additional safety is ensured;
h. The heat-producing gas lighter or gas tank may be recharged or, where a disposable lighter or disposable gas tank is used, exchanged whenever necessary;
i. The thermodot applied to the surface of the housing provides a visual safety feature. Should a critical temperature be attained for any reason, the thermodot will change its color. In this event, the appliance has to be turned off. This is achieved by easing thelight thumb pressure applied to the lighter. Thus, the spring pressure of its gas lever causes the lighter to retract from its position
REFERENCES:
patent: 4321934 (1982-03-01), Diederich
Bennet Henry A.
Braun Aktiengesellschaft
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