DE2011818A1 - Electric hair dryer - Google Patents

Description

73 Esslingen (Neckar), Fabrikstrasse 9, Postfach 348 March 12, 1970

PA 64 nale telephone

fi \ O <* Haie Stuttgart (0711) 356539

Telegrams patent protection Esslingenneckar

General Electric Company, 1 River Road, Schenectady, Hew York, 12 305, TU. Y. / USA

Electric hair dryer

The invention relates to an electric hair dryer, consisting of a co-operating with a heating device Blower for the drying air, a drying hood and a further heating device containing Steam generator, which is connected to the dryer hood, and a control switch through which the fan can be activated for the dry air and the steam generator can be made effective. ■

Two different types of hair dryers are generally known and in use. One kind is from the hair dryers used for professional purposes, such as those used in hairdressing salons. The other way consists of the household hair dryers, which are generally small portable devices. The one for professional purposes The hair dryer used is heavy and expensive and must be operated by a member of the hairdressing salon who makes all the necessary settings on the hair dryer and operates it during the treatment supervised. In contrast, the household hair dryer is almost always operated by the user, and this also makes all the necessary settings for the desired hair treatment. That is why it is particularly desirable to have available household hairdryers that are light and efficient can be operated and with which the hair is on

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can be treated in different ways. 'If you can Hair the warning or the via steam and preferably both .; exposing, the hard outer layer of the individual hair is softened, so that the hair when you put it in the state Lets dry, so it stays in the desired shape for durability, usually the water vapor is with it Applied to the hair using a steam generator, which is generally combined with a hairdryer. A Such a hair dryer is described in the earlier patent application P 19 49 793.4 of the applicant of October 2, 1969 and shown.

Electric hair dryers that incorporate a steam generator are known. However, they have various disadvantages on. One of these disadvantages is that their operation is inconvenient for the user. It is Z. B. general It is common practice to roll the Ilaare in curlers and then apply steam to the curled hair to soften it, then apply warm air to dry the coiled hair and finally remove the curlers. In the known hair dryers, the user has to manually switch a control switch Operate to turn on the drying fan when the application of steam and its generation is complete. This is quite inconvenient as the switch is on the base of the hair dryer, which is generally behind the User stands. In addition, the user must ensure that he correctly sets the switch to the appropriate one To maintain the temperature of the dry air.

Another disadvantage of the known hair dryers is that the user does not know for a while that the Liquid has boiled away in the steam generator and therefore da3 blower must be switched on to apply the drying air to the hair. As the user dio liquid in the steam generator, he only realizes

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after a certain time that the liquid has boiled away and the drying fan has to be switched on. This is how it goes considerable time lost, which increases the total treatment time. Even with hair dryers that do Switch on the drying fan automatically, after the steam treatment has ended, the control takes place such that the steam generator is switched off first

gust
/ some time later the drying fan comes into effect.

This also results in a loss of time.

Another disadvantage of known hair dryers, the contain a steam generator is that their Control means do not respond quickly enough to the rise in temperature after the liquid in the steam generator is overcooked. The consequence of this is that the temperature of the steam generator rises very sharply before the heating element the steam generator is switched off. This deficiency is particularly serious in the case of proportionate small portable steam generators whose housing is made of plastic exists and can be held in the hand.

The object of the invention is to provide an electric hair dryer that contains a steam generator as described at the outset has been characterized in detail to be improved in such a way that the hair hair fell as a whole as possible plays for a short time, and the user does not pay special attention to the operation of the device during the treatment needs to devote.

According to the invention, the steam generator is assigned a heat switch, which in the case of boiling in the Steam generator contained liquid automatically under the influence of the resulting temperature increase first turns on the fan motor for the dry air and the associated heating device and only then the heating device of the steam generator switches off.

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Preferably, the thermal switch is set so that it responds to a temperature slightly above the boiling point of the liquid contained in the steam generator.

The invention makes it unnecessary for the user of the hair dryer to boil the liquid in the steam generator monitors and detects that the blower for the dry air is switched on automatically at the right moment and also the drying air with an optional setting option for the temperature correct (highest) temperature. This saves time for the user. Through this, that the heat switch already responds to a temperature a little above the boiling point in the The liquid contained in the steam generator will be damaged, preferably made of plastic Steam generator is avoided by excessively high temperatures and also prevents nuisance to the user, who may take the steam generator by hand.

An exemplary embodiment of the invention is shown in the drawing. Show it:

Fig. 1 shows a hair dryer according to the invention in perspective Depiction,

2 shows a control switch for actuating the hair dryer in a perspective view,

3 shows the heat switch assigned to the steam generator in a side view, and FIG

4 shows the electrical circuit of the hair dryer in a schematic representation.

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Fig. 1 shows the hair dryer in the state of use. It consists of a base 10, a rigid hood 11, which Is placed over the head of the user, and an air duct 12 connecting these two parts, the telescopic is adjustable in order to be able to arrange the hood at a suitable height above the head of the user. Finally contains he still has a steam generator 13, which the steam through the Air shaft 12 and the hood 11 blows on the user's head. The hair dryer can have a structure as shown in Fig. 1 is shown. The hair dryer is designed in this case that it is on a table or as a whole a similar suitable mat can be placed while the user is seated in a chair with his head holds in the rigid hood 11. However, the invention can also be used for other types of hair dryers, and the hair dryer shown in Fig. 1 is only to be regarded as an example. The invention can e.g. B. also at Hair dryers used v / earths in which the steam generator is built into the base so that it does not, as with the hair dryer according to Fig. 1, can be removed.

In the case of the hair dryer shown, the base 10 is formed by a housing which has the usual means for generating a stream of hot air. Accordingly, the housing contains a heater for heating the air Electric motor-driven fan for generating the air flow and switching and control means for the heating device and the fan, which includes a manually operated control switch that is externally accessible. In the case Suitable air ducts are also formed with an inlet for the outside air and an outlet for the heated air connected to the air duct 12. The housing forming the base 10 consists of a Container 14 and a lid 15 made of a rigid plastic of a suitable type. At the top 16 of the cover 15 is in the middle an air inlet

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grid 17 formed. On the top IG of the lid the rotary knob 18 of the control switch is also arranged, so that it can be reached by the user in order to regulate the processes of hair drying and steam application by hand. The heating device of the steam generator 13 receives voltage via a connecting cable 19, which is fed into the lower linden tree of the steam generator 13 goes in and over the base 10 of the hair dryer with an external power source, z. E. one Wall socket, is connected.

In order to be able to operate the hair dryer in various ways, a five-position switch 30 is provided (FIG. 2), which can assume the positions "off", "cool", "warm", "hot" and "steam". The switch 30 will only be described generally in the following as it does not constitute a particular part of the invention and any suitable five position switch would serve the purpose. How such a switch works in connection with the present invention will be explained below in connection with FIG. As the person skilled in the art knows, the five-position switch contains an insulating housing 31 with four openings 32 for the electrical lines on two opposite sides of the housing. An insulating cover plate 33 is inserted between the dome housing 31 and a component 34 holding the individual parts of the switch. A nut 35 is screwed onto a collar 36 through which the switch shaft (not shown) passes, which connects the Hopf 18 with the inner components of the switch < _v . The nut 35 is used to fasten the switch 30 on the top 16 of the cover 15.

In Fig. 3, the heat switch 40 is shown, which is automatic turns on the drying device at the correct temperature when the liquid in the steam generator boils off before the steam generator is switched off. The heat switch is expediently in the immediate vicinity of the heating device of the steam generator arranged so that their

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Temperature is quickly and effectively transferred to the thermal switch. The heat switch 40 is a base plate on which the various electrical contacts and line connectors are mounted, through ceramic insulating washers 42 are separated from each other. There are three line fittings 43 for attaching wires, preferably by soldering, provided. The heat switch 40 is constructed such that the contact spring 44 with the contact button 45 is in contact with the contact spring 55, which carries the contact rail 46. The contact rail helps to solidify the contact spring 55 and ensures good electrical contact. The contact spring 55 is under tension, such that it is normally with the contact spring 4 via the contact rail 46 and the contact button 45 is in contact. The contact voltage can be adjusted with the help of an adjusting screw 47 can be set over the contact springs 55 and 44 is electrically insulated a bimetal

49
strip that responds to heat, arranged, which works in the usual way. When the bimetal strip is exposed to heat, the difference in the expansion coefficients of the two strip-shaped metal parts that make up the bimetal strip 49 causes the bimetal strip to bend. The bimetallic strip 49 • carries an elongated button 50, which extends downwards towards the contact spring 55, but remains at a distance therefrom. As the temperature rises, the bimetal strip 49 bends gradually and, since the metal with the lower coefficient of expansion is on the side of the elongated button 50, the bimetal strip bends against the contact spring 55 and the button 50 makes electrical contact with the rail 46 on the contact spring 55. The bimetal strip 49 also carries a band-shaped heating element 51 of low resistance, the outer end of which rests against the top of the bimetal strip and is electrically connected to it

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is, the inner end of which is isolated from the bimetallic strip by an insulating washer 52. The mode of action this band-shaped heating element 51 is explained below will.

The entire thermal switch is held together by a sleeve (not shown), which is in the middle through the insulating washers 42, through the line connecting pieces 43, the contact springs 55 and 44, the bimetallic strip 49 and the base plate 41 passes through. The sleeve 48 has flanges 53 at its ends to keep all of the components in the correct position to stick together. A screw bolt which protrudes beyond the flange 53 passes through the sleeve. He doesn't educate part of the thermal switch, but merely represents a means that serves to keep the thermal switch in the correct position Position opposite the heating device of the steam generator. In the particular case at hand, the Screw bolt 54 attached to the bottom of the liquid container of the steam generator, in which the heating device is located.

For a precise explanation of the function of the control switch 3O and the thermal switch 40, reference is made to FIG. 4, in which the electrical circuit diagram of the hair dryer is reproduced is.

The control switch 30 is shown in Fig. 4 with an upper half 102 and a lower half 103, which are electrically insulated from one another in all respects. The outer one Part of the two halves of the switch always consists of insulating material and carries the connecting pieces in the upper half L2, Sl and B and in the lower half the connectors Ll, 1, -2 and 3. In the upper half, L2 is with a Series of contacts 83, 88, 94 and 100 connected, with the contacts approximately 18 ° apart on an arc of a circle are arranged. Sl is with a single contact

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while B is connected to three contacts 82, 87 and 93 in Connection. In the lower half 103, the connector Ll is connected to four contacts 80, 84, 89 and 95, these contacts in turn being arranged at a distance of 18 ° on an arc of a circle. The connector 1 is connected to the three contacts 85, 91 and 97. The connector 2 is connected to the contacts 81, 86, 92 and 89 in connection, and the connector 3 is connected to the contacts 90 and 96. Inside each of the Switch halves, a rotating body made of electrically conductive material is arranged axially, the radially extending Has contact arms that can slide over the aforementioned contact sets. These independent electrically conductive Rotary bodies 104 for the upper and 105 for the lower half of the switch are mechanically connected to the operating button connected in such a way that they can be incremented by 18 °. This ensures that that the radial contact arms on each rotating body slidingly touch the stationary contacts. In Fig. 4 the control switch is shown in the "off" position, and the switch * is set up in such a way. that he was in four Steps can be rotated counterclockwise.

When the connector 56 connects to the mains and the operating button 18 counterclockwise from the "off" position to the "cool ·" position has been twisted, then the lower conductive rotating body 105 provides an electrical connection between the connecting piece Ll via the contacts 80 and 81 to the connecting piece 2, while the upper conductive Rotary body 104 connects the connector L2 to the connector B via the contacts 82 and 83. In this way a circuit comes about, which from the Nctzleltung via the connector Ll, the connector 2, the multiple connector 58, the electric motor 60, the multiple

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connecting piece 59, the connecting piece B and the connecting piece L2 to the connecting line 68 leads back. The remaining . The device's electrical circuits are open. Therefore, when the switch is in the "cool" position, only the motor 60 actuates which blows air through the hair dryer which is only given the heat imparted to the Ilotor delivers.

If the actuating button 18 is turned counterclockwise by a further 18 ° into the "warm" position, the lower rotating body 105 produces an additional connection to the connection piece 1, namely via the contact 85. In addition to the circuit for the cooling position described above, there is now another more complete circuit The circuit is established via the mains connection line 57, connection piece Ll, contact 84, rotating body 105, contact 85, Connector 1, 500 watt heater 61, fuse 67, thermostat 66, multiple connector 59, connector B, contact 87, upper rotating body 104, contact 83, connector L2 and power cord 68. In the "warm" position therefore the motor works together with the heater 61 to get warm air through the hair dryer to blow.

If the actuating button 13 is rotated by a further detent segment of 18 ° into the "hot" position, another circuit is established via the lower rotating body 105 to the contact 90 and the connector 3, the rotating body also being in conductive connection via the contact 89 to the connection piece Ll and via the contact 92 to the connection piece 2 is located. This creates a circuit from the mains connection line 57 via the connector Ll, connector 3, 300 watt heater 62, fuse 67, thermostat 66, multiple connector 59, connector B, rotating body 104, contact 93, connector L2 (via contact 94) to the Natzanschluöleitung 60. In

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the "hot" position of the switch is therefore the motor 60 and both heating devices with a total of 800 watts below Tension. . . -

When the operating button 18 is opposite by a further step has been rotated clockwise to the "steam" position, the lower rotating body 105 connects the connector Ll via the contacts 95, 98, 97 and 96 with the connecting pieces 1, 2 and 3. The upper rotating body 104 connects only the connector S1 via the contacts 99 and 100 with the connector L2. Therefore, initially only the circuit to the heating device 65 in the steam generator 13 is closed. This circuit runs from the Mains connection line 57 via connection piece Ll, connection piece 2, multiple connection piece 58, connection cable 19, heating device 65, fuse 64, contact spring 44, usually closed contacts 45 and 46, under bias standing contact spring 55, back via the connecting cable 19, connecting piece S1 and connecting piece 12 to the mains connection line 68. In the "steam" position, in which the steam is generated, the motor 60 and the heating devices are located 61 and 62 not energized, since there is no closed circuit via the connection piece B to the upper rotating body 104 runs and since the rotating body 104 makes no electrical contact with the connector B in the "steam" position. However, if the liquid in the steam generator has boiled away, the temperature may increase near the heating device 65 increase to a predetermined and preset size that is slightly above the boiling point of the liquid lies. At this lateral point, the bimetallic strip 49 of the heat switch 40 bends downward, like this has been explained above, whereupon the extended contact button 50 · of the bimetallic strip 49 makes electrical contact with the contact rail 46 and that normally open circuit via the motor 60 and the parallel circuits via the heaters 61 and 22 closes.

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The circuit to the heating devices runs through Ll of the lower rotating body 105, the connecting pieces 1 and 3, parallel via the heating devices 61 and 62, fuse 67 and thermostat 66 to the multiple connector 59. The motor circuit runs through Ll, rotating body 105, Contact 98, connector 2 to motor 60 and then to the same 'multiple connector 59. From this ^ ird der Circuit for motor and heating devices to L2 completed via connection cable 19, heating element 51, Contact 50, contact bar 46, connecting cable 19 to Sl and then via contact 99 to the upper rotating body 104 and contact 100 to L2. Therefore, when the liquid in the steam generator is boiled away, it becomes the one to dry the hair serving part of the device is switched on automatically, and the full heat capacity of the hair dryer is used for this Purpose exploited. When the electrical contact between the contact button 50 and the contact rail 46 is established is, the circuit via the steam generator is also closed, so that the heating device of the steam generator is still under tension. If necessary, the heat holder could also be designed such that it causes the normally open contacts to close at the same time and the normally closed contacts are opened. The heating element 51, whose resistance is only a fraction of one ohm is attached to the bimetal strip 49 of the thermal switch and receives voltage when the contact button 50 and the contact bar 46 make contact to complete the circuit, so that the heating element 51 generated directly on the bimetal strip 49 heat. This heat causes the bimetal strip 49 to be in increased Bend dimensions so that the contact button 50 exerts a sufficient force on the contact rail 46, which on the spring-preloaded contact spring 55 is seated in order to separate the contact rail 46 from the contact button 45 and the circuit through the heater 65 of the steam " create su open. This arrangement is the

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Hair drying device before switching off the Effective steam generator. The heating element 51 also serves to continuously supply heat to the bimetal strip 49 and this causes a return or repeated opening and closing of the circuit to the heating device 51 of the To prevent steam generator.

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Claims (5)

- 14 claims [l J Electric hair dryer consisting of a fan for the drying air that interacts with a heating device, a drying hood and a steam generator containing another heating device, which is connected to the drying hood, as well as a control switch through which the fan for the drying air and the steam generator can be activated can be made, characterized in that the steam generator (13) is assigned a heat switch (40) which, in the event of boiling of the liquid contained in the steam generator (13) under the influence of the resulting temperature increase, automatically first activates the fan motor (60) for the dry air and the associated heating device (61, 62) switches on and only then switches off the heating device of the steam generator (13). 2. Electric hair dryer according to claim 1, characterized characterized in that the thermal switch (40) is set to respond to a temperature which a little above the boiling point in the steam generator (13) contained liquid lies. 3. Electric hair dryer according to claim 1, characterized in that the heat switch (40) is a bimetal switch is. 4. Electric hair dryer according to claim 3, characterized marked that in the immediate lieh of the bimetal strip (49) of the dimetal switch (40) is a heating element (51) is arranged, which is effective when the bimetal switch the circuit for the Gehläsemotor (60) and the Haizaineinrichtung (61, 62) has closed to the 009840/1368 - 15 Effectiveness of the bimetal switch in the following to open the contacts of the circuit for the heating device of the steam generator (13). 5. Electric hair dryer according to claim 1, characterized marked, dad the heat switch (40) all cooperate with the fan for the dry air Turns on heating devices (61, 62). 0Q9S4O / 13S8