CN205282711U - Supply socket and car cigar lighter thereof - Google Patents

Abstract

The utility model discloses a supply socket, including socket shell, electrical connection portion, bimetallic element and first insulator. Socket shell has the inner chamber of opening in the socket shell upper end. Electrical connection portion includes the bench insulator and is used for being connected to first, the electric terminal of second of power. The bench insulator is fixed in socket shell's lower extreme, and first electric terminal switches on with socket shell is electric. Bimetallic element and first insulator all set up in socket shell's inner chamber, bimetallic element and socket shell are insulating, its have at least two upwards or downwardly extending's joint press from both sides. First insulator's top is located bimetallic element's top, and first insulator's top is equipped with the recess, is equipped with electrical contact portion in the recess, electrical contact portion and bimetallic element all with electric the switching on of the electric terminal of second. The utility model also discloses an adopt this supply socket's car cigar lighter.

Description

Supply socket and automobile cigarette lighter thereof

Technical field

The utility model relates to the supply socket that can be used for vehicle and the automobile cigarette lighter adopting this supply socket.

Background technology

Der zigarrenanzunder is a kind of common car-mounted device, can be used for lighting cigarette. Der zigarrenanzunder forms primarily of cigarette lighter plug and socket. Socket is connected with vehicle power. When cigarette lighter plug is inserted socket, forming circuit loop, the heating unit in cigarette lighter plug is heated because there being electric current to flow through. When being heated to predetermined temperature, bimetallic element deforms, and cigarette lighter plug is ejected by spring, it may also be useful to cigarette lighter plug can be extracted by person from socket, and lights cigarette with the heating unit in cigarette lighter plug.

The development of and technology more and more universal along with automobile, the function of Der zigarrenanzunder and safety performance be it is also proposed higher requirement by people.

Practical novel content

In view of this, the utility model embodiment provides a kind of supply socket, comprises jack housing, electrical connection portion, bimetallic element and the first isolator; Jack housing has an inner chamber, and this lumen openings is in the upper end of jack housing; Electrical connection portion comprises bench insulator and the first electric terminal and the 2nd electric terminal for being connected to outside power supply; Bench insulator is fixed on the lower end of jack housing, the first electric terminal and jack housing electrically conducting; Bimetallic element and the first isolator are all arranged in the inner chamber of jack housing; Bimetallic element and jack housing keep insulation, and this bimetallic element has at least two joint folders upwards extended or extend downwards; The top of the first isolator is positioned at the top of bimetallic element, and the top of the first isolator is provided with groove, is provided with electrical contacts in groove; Electrical contacts and bimetallic element all with the 2nd electric terminal electrically conducting.

Of the present utility model another embodiment still provides a kind of automobile cigarette lighter, comprises cigarette lighter plug and above-mentioned supply socket; Cigarette lighter plug comprises plug casing, Handleset and electric heating component; Plug casing can insert in the inner chamber of the Socket casing of supply socket, and with Socket casing electrically conducting; Handleset is arranged on the upper end of plug casing, and this Handleset comprises an operation handle arm, and operation handle arm can carry out flexible motion by resisting the bias voltage of elastic element; Electric heating component is arranged on the lower end of plug casing, and electric heating component comprises heating unit, conducting sleeve and central fastener; Conducting sleeve is centered around heating unit periphery, and heating unit and conducting sleeve and Handleset are linked together by central fastener, and central fastener and plug casing electrically conducting; Heating unit has the 3rd electric terminal and the 4th electric terminal, the 3rd electric terminal and central fastener electrically conducting, the 4th electric terminal and conducting sleeve electrically conducting; Heating unit can be followed operation handle arm and be moved together, and has stand-by station and on-position; Wherein, when operation handle arm is not pressed, heating unit is in stand-by station, conducting sleeve does not contact with the bimetallic element in supply socket and heating unit is not energized, when operation handle arm is pressed, heating unit is in on-position, and at least two joint folders of the bimetallic element in the sidewall of conducting sleeve and supply socket are engaged with each other so that heating unit is energized.

The utility model at least reaches one of following useful effect:

1, in supply socket of the present utility model, the top of the first isolator is positioned at the top of bimetallic element, and the upper surface of the first isolator is higher than bimetallic element. When the plug insertion supply socket of external electronic device, bimetallic element can not be encountered, thus serve the effect avoiding bimetallic element to be subject to external force deformation. In addition, when there being the foreign matter of such as coin and so on to fall in supply socket, owing to foreign matter by gap between the first isolator and the inwall of jack housing, thus short circuit cannot can not occur, it is to increase supply socket security in use;

2, the bimetallic element in the utility model supply socket can for cigarette lighter plug power taking time, the groove on the first isolator in the utility model supply socket and be arranged in this groove electrical contacts can for the plug power taking of other electronics time so that supply socket of the present utility model has good versatility;

Radially-inwardly bend when 3, being clipped in be heated to preset temperature according at least two joints of the bimetallic element of the utility model one embodiment, contribute to reducing the volume of supply socket.

Accompanying drawing explanation

In order to the technical scheme being illustrated more clearly in the utility model embodiment, below the accompanying drawing used required in embodiment being described is briefly introduced, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for the those of ordinary skill of this area, under the prerequisite not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.

Fig. 1 shows the diagrammatic cross-section of the supply socket according to the utility model one embodiment;

Fig. 2 shows the diagrammatic cross-section of the supply socket according to the utility model one embodiment from Fig. 1 to rotate in the way of in the of 90 ��;

Fig. 3 shows the exploded perspective view of the supply socket according to the utility model one embodiment;

Fig. 4 shows the diagrammatic cross-section of the cigarette lighter plug according to the utility model one embodiment;

Fig. 5 shows the exploded perspective view of the heating component according to the utility model one embodiment;

Fig. 6 shows the diagrammatic cross-section of the heating component according to the utility model one embodiment;

Fig. 7 shows the exploded perspective view of the handle assembly according to the utility model one embodiment and plug casing;

Fig. 8 shows the diagrammatic cross-section of the Der zigarrenanzunder according to the utility model one embodiment, and wherein, heating unit is in stand-by station;

Fig. 9 shows the diagrammatic cross-section of the Der zigarrenanzunder according to the utility model one embodiment from Fig. 8 to rotate in the way of in the of 90 ��, wherein, heating unit is in stand-by station;

Figure 10 shows the diagrammatic cross-section of the Der zigarrenanzunder according to the utility model one embodiment, and wherein, heating unit is in on-position;

Figure 11 shows the diagrammatic cross-section of the cigarette lighter plug according to another embodiment of the utility model.

Embodiment

Below in conjunction with accompanying drawing, the utility model made further explanation.

First it should be noted that, the direction used in the application and position terms " on ", D score, " top ", " end ", " interior ", " outward " etc. be all based on present specification direction shown in the drawings and position relation, it is only used to simplified characterization, and not indicate the device of the application and element with this specific direction structure or operation, therefore must can not be interpreted as the restriction to the application.

At present, owing to the use frequency of automobile cigarette lighter is not high, the supply socket of Der zigarrenanzunder usually can be used for as electronics power takings such as mobile phone, portable computer, panel computer, audio player, USB interfaces by car owner. Owing to the bimetallic element in existing supply socket is directly exposed to the oral area of supply socket, thus it is easy to be subject to external force and be out of shape in the process, and then causes supply socket cannot realize power supply for cigarette lighter plug; In addition, in the process using supply socket, once there be the foreign matter of such as coin and so on to fall in supply socket, also it is easy to phenomenon short circuit occurring and then blowing safety fuse.

Fig. 1 to Fig. 3 shows a kind of supply socket according to the utility model one embodiment. As shown in Figure 1 to Figure 3, supply socket comprises jack housing 11, electrical connection portion 12, bimetallic element 13, first isolator 14, the 2nd isolator 15 and center conductive plug-in unit 16.

Described jack housing 11 is made up of conducting metal, and it has inner chamber 110, and inner chamber 110 is opened on the upper end of jack housing 11, with the plug of acceptance point smoke device plug and other electronics.

Electrical connection portion 12 comprises bench insulator 120 and the first electric terminal 121 and the 2nd electric terminal 122 for being connected to outside power supply. Bench insulator 120 is fixed on the lower end of jack housing 11, the first electric terminal 121 and jack housing 11 electrically conducting. In the present embodiment, the first electric terminal 121 and the 2nd electric terminal 122 preferably respectively positive pole with outside power supply be connected with negative pole, but be not limited to this. The tab portion 121b that first electric terminal 121 comprises horizontal-extending terminal body 121a and bends downwards by the side of terminal body 121a, terminal body 121a directly contacts with the diapire 111 of jack housing 11, thus realizes the electrically conducting of the first electric terminal 121 with jack housing 11.

Bimetallic element 13 and the first isolator 14 are all arranged in the inner chamber 110 of jack housing. Bimetallic element 13 keeps insulation by the 2nd isolator 15 being clamped between this bimetallic element 13 and diapire 111 of Socket casing with jack housing 11. Bimetallic element 13 has at least two joint folders 131 upwards extended, and in example in the drawings, the quantity engaging folder 131 is two, and toward each other.

The top of the first isolator 14 is positioned at the top of bimetallic element 13, and the upper surface of the first isolator 14 is higher than the clamping part 131a of the joint folder 131 of bimetallic element, and the upper surface of the first isolator 14 is positioned at the top of the clamping part 131a engaging folder 131. When the plug insertion supply socket of external electronic device, bimetallic element 13 can not be encountered, thus serve the effect avoiding bimetallic element to be subject to external force deformation. In addition, when there being the foreign matter of such as coin and so on to fall in supply socket, owing to foreign matter by the gap between the first isolator 14 and the inwall of jack housing 11, thus short circuit cannot can not occur. The top of the first isolator 14 is provided with groove 140, is provided with electrical contacts 122a in groove 140; Electrical contacts 122a and bimetallic element 13 all with the 2nd electric terminal 122 electrically conducting. Groove 140 can receive the insertion of the plug of external electronic device, this kind of plug is usually in lip pencil, the first electrical contact body and the 2nd electrical contact body it is respectively equipped with in the bottom of plug and sidewall, when this plug inserts in groove 140, it is positioned at the first electrical contact body and the electrical contacts 122a electrically conducting of plug bottom, it is positioned at the 2nd electrical contact body of plug sidewall and the sidewall electrically conducting of jack housing 11, thus forms circuit loop.

The diapire 111 of bench insulator 120, Socket casing, the 2nd isolator 15, bimetallic element 13, first isolator 14 are equipped with centre hole, center conductive plug-in unit 16 is through the centre hole 14h of the centre hole 111h of the diapire 111 of the centre hole 120h of bench insulator 120, Socket casing, the centre hole 15h of the 2nd isolator 15, the centre hole 13h of bimetallic element and the first isolator 14, bench insulator 120 and Socket casing 11 are connected and fixed, and bimetallic element 13 and the first isolator 14 are fixed in the inner chamber 110 of jack housing. The top and bottom of center conductive plug-in unit 16 respectively with electrical contacts 122a and the 2nd electric terminal 122 electrically conducting.

Preferably, supply socket also comprises conductive spacer 17 and conducting plug pad 18, conductive spacer 17 is clamped between the first isolator 14 and bimetallic element 13, conducting plug pad 18 is between terminal body 121a and the top of bench insulator 120, conductive spacer 17, conducting plug pad 18 and terminal body 121a are provided with a centre hole, and center conductive plug-in unit 16 passes the centre hole 121h of the centre hole 17h of conductive spacer, the centre hole 18h and terminal body 121a of conducting plug pad 18. Wherein, the centre hole 17h shrink-fit of center conductive plug-in unit 16 and conductive spacer, thus realize the electrically conducting of center conductive plug-in unit 16 with conductive spacer 17. Simultaneously, preferably, the centre hole 13h running fit of center conductive plug-in unit 16 and bimetallic element, so that center conductive plug-in unit 16 keeps insulation with bimetallic element 13, the electric current flowed into by the 2nd electric terminal 122 is so made to flow into bimetallic element 13 via conductive spacer 17, the problem that the bimetallic element that the direct shrink-fit of centre hole 17h of center conductive plug-in unit 16 and bimetallic element 13 can be avoided to cause easily deforms.

In example shown in the figure, center conductive plug-in unit 16 is connected with electrical contacts 122a and the 2nd electric terminal 122. That is, this center conductive plug-in unit 16 itself is also the 2nd electric terminal, and the top of center conductive plug-in unit 16 forms above-mentioned electrical contacts 122a, is also provided with pad 19 between electrical contacts 122a and the bottom surface of groove 140.

In other embodiments, as shown in figure 11, it is also possible to engage folder 131 by least two of bimetallic element 13 and be set to downward extension, be now only provided with the first isolator 14a, the 2nd isolator is not set. First isolator 14a is set directly on the diapire 111 of jack housing 11, the top of the first isolator 14a is provided with the groove 140a of the body 130 of accommodating bimetallic element 13, the upper surface 141a of the first isolator 14a is higher than bimetallic element 13, that is first the top of isolator 14a be positioned at the top of bimetallic element 13, the upper surface of the first isolator 14a is positioned at the top of the clamping part 131a engaging folder 131. Center conductive plug-in unit 16 is through the centre hole of the centre hole of bench insulator 120, the centre hole of diapire 111 of Socket casing, the centre hole of the body 130 of bimetallic element and the first isolator 14a, the top of center conductive plug-in unit 16 forms electrical contacts 122a, bimetallic element 13 is fixed on the first isolator 14a by center conductive plug-in unit 16, simultaneously center conductive plug-in unit 16 also with bimetallic element 13 electrically conducting.

Fig. 4 to Fig. 7 shows the structure of the cigarette lighter plug according to the utility model one embodiment. Cigarette lighter plug comprises plug casing 21, Handleset and electric heating component.

Plug casing 21 is made up of conducting metal, in its inner chamber 110 that can insert the Socket casing 11 of supply socket, and with Socket casing 11 electrically conducting.

Handleset is arranged on the upper end of plug casing 21. This Handleset comprises operation handle arm 221, anti-scald circle 223, spring pad 225, compression spring 227 and location basin 229. Operation handle arm 221 comprises handle 221a and metal shaft 221b, and handle 221a is arranged on metal shaft 221b. Anti-scald circle 223 is fixed on the upper end of plug casing 21, and around handle 221a. Metal shaft 221b is successively through spring pad 225, compression spring 227 and location basin 229, metal shaft 221b and location basin 229 electrically conducting. Wherein, the multiple snap arm portion 229b that radially extends locating that basin 229 comprises base dish portion 229a and be disposed on base dish portion 229a periphery and multiple blocking arm portion 229c upwards turning over folding. Plug casing 21 is provided with the card groove 21b corresponding with multiple snap arm portion 229b, and multiple snap arm portion 229b inserts in multiple card groove 21b respectively, and can move up and down in card groove 21b. Multiple blocking arm portion 229c contacts slippingly with the inwall of plug casing 21, and electrically conducting. Compression spring 227 is between spring pad 225 and location basin 229, and operation handle arm can carry out flexible motion by resisting the bias voltage of compression spring 227.

Electric heating component is arranged on the lower end of plug casing 21. Electric heating component comprises heating unit 231, conducting sleeve 233 and central fastener 235; It is peripheral that conducting sleeve 233 is centered around heating unit 231, and heating unit 231 and conducting sleeve 233 are linked together by central fastener 235 with above-mentioned Handleset, and central fastener 235 and plug casing 21 electrically conducting.

Preferably, electric heating component comprises insulation pad 232, electric heating basin 234, the bi-metal plate 236 being stacked in successively from bottom to up on the roof of conducting sleeve 233, insulation pad 237 and conductive spacer 238 further, and the roof 234a of insulation pad 232, electric heating basin 234, conducting sleeve 233, the roof 233a of conducting sleeve, bi-metal plate 236, insulation pad 237, conductive spacer 238 are equipped with centre hole. Central fastener 235 is the screw that a conducting metal is made, central fastener 235 is successively through centre hole 234h, the centre hole 233h of conducting sleeve roof 233a, centre hole 236h, the centre hole 237h of insulation pad of bi-metal plate and the centre hole 238h of conductive spacer of the insulation centre hole 232h of pad, electric heating basin roof 234a, the upper end of central fastener 235 is worn in the screwed hole of centre 221h being opened on metal shaft 221b bottom surface, and is threaded with screwed hole of centre 221h. Nut 239 rotation set in central fastener 235, for electric heating component is carried out fastening. The lower end of central fastener 235 and the center of heating unit 231 are interconnected by the mode of riveted joint. Central fastener 235 is also provided with annular boss 235a, in order to supports insulative pad 232. Wherein, centre hole 234h, the centre hole 233h of conducting sleeve roof of central fastener 235 and electric heating basin roof and all non-electrical contact of centre hole 236 of bi-metal plate, thus make central fastener keep insulation with electric heating basin, conducting sleeve and bi-metal plate respectively, and preferably by nut 239 and conductive spacer electrically conducting. It is peripheral that electric heating basin 234 is centered around heating unit 231, and between heating unit 231 and conducting sleeve 233. Electric heating basin 234 and conducting sleeve 233 contact with each other, and therefore the two is electrically conducting. Heating unit 231 is played the effect supporting further and protecting by electric heating basin 234, it is necessary to explanation, it is not required element.

Bi-metal plate 236 is provided with breach with insulation pad 237 in corresponding position, is provided with socle girder 236b in the breach 236a of bi-metal plate. The active layers of this bi-metal plate is arranged on the lower section of passive layer, and therefore when bi-metal plate is heated to predetermined safety temperature, socle girder 236b can be bent upwards, and contacts through corresponding breach 237a on insulation pad with conductive spacer 238.

Heating unit 231 has the 3rd electric terminal and the 4th electric terminal, the 3rd electric terminal and central fastener electrically conducting, the 4th electric terminal and conducting sleeve electrically conducting. Heating unit is made up of the resistive material silk of spirrillum or resistive material band, and the 3rd electric terminal is positioned at the resistive material silk of this spirrillum or the center of resistive material band, and is connected with the lower end of central fastener 235; 4th electric terminal is positioned at the resistive material silk of this spirrillum or the periphery of resistive material band, with the sidewall contact of electric heating basin 234.

Fig. 8 and Fig. 9 shows the cross-sectional view when Der zigarrenanzunder according to the utility model one embodiment is in standby state. Figure 10 shows the cross-sectional view when Der zigarrenanzunder according to the utility model one embodiment is in switch-on regime. The heating unit 231 of cigarette lighter plug can be followed operation handle arm 221 and be moved together, and has stand-by station and on-position. As shown in Figure 8 and Figure 9, when operation handle arm 221 is not pressed, heating unit 231 is in stand-by station, and the conducting sleeve 233 of cigarette lighter plug does not contact with the bimetallic element 13 in supply socket and heating unit 231 is not energized. As shown in Figure 10, when operation handle arm 221 is pressed, heating unit is in on-position, at least two of the sidewall of conducting sleeve 233 and the bimetallic element in supply socket engage folder 131 and are engaged with each other, the engaged folder 131 of conducting sleeve 233 remains on the position of energising, and heating unit 231 is energized. Concrete current flow path is: the electric current flowing into the 2nd electric terminal 122 from positive source, successively through center conductive plug-in unit 16, conductive spacer 17, bimetallic element 13, conducting sleeve 233 and electric heating basin 234, then flow into the 4th electric terminal of heating unit 231. Heating unit 231 is heated because there being electric current to pass through. The electric current flowed out from the 3rd electric terminal of heating unit 231 flows into the first electric terminal 121 successively after central fastener 235, metal shaft 221b, spring pad 225, compression spring 227, location basin 229, plug casing 21 and Socket casing 11, then returns power cathode by the first electric terminal 121.

In the present embodiment, the active layers of bimetallic element 13 is positioned at the outside of driven layer, and when heating unit 231 is in on-position, the inner side-wall of conducting sleeve 233 is engaged with each other with at least two outer sides engaging folder 131 of the bimetallic element in supply socket. When bimetallic element 13 is heated to preset temperature, at least two of bimetallic element 13 engage folder 131 and curve inwardly, thus discharging conducting sleeve 233, operation handle arm 221 drives electric heating component to move up together under the bias effect of compression spring 227, heating unit power-off.

When Der zigarrenanzunder exception in use occurs, cause the temperature of bimetallic element 13 after higher than preset temperature still cannot power-off time, bi-metal plate 236 can continue heat temperature raising until predetermined safety temperature, now socle girder 236b can be bent upwards, and contact through corresponding breach 237a on insulation pad with conductive spacer 238, thus cause short circuit, make to be fused for the safety fuse in electric line, thus avoid the risk of fire.

Although having described preferred embodiment of the present utility model, but those skilled in the art once the substantially creative concept of cicada, then these embodiments can be made other change and amendment. Therefore, it is intended that the appended claims shall be construed comprise preferred embodiment and fall into all changes and the amendment of the utility model scope.

Obviously, the utility model can be carried out various change and modification and not depart from spirit and scope of the present utility model by the technician of this area. Like this, if these amendments of the present utility model and modification belong within the scope of the utility model claim and equivalent technologies thereof, then the utility model also is intended to comprise these change and modification.

Claims (11)

1. a supply socket, it is characterised in that, comprise jack housing, electrical connection portion, bimetallic element and the first isolator;

Described jack housing has an inner chamber, and described lumen openings is in the upper end of described jack housing;

Described electrical connection portion comprises bench insulator and the first electric terminal and the 2nd electric terminal for being connected to outside power supply; Described bench insulator is fixed on the lower end of described jack housing, described first electric terminal and described jack housing electrically conducting;

Described bimetallic element and described first isolator are all arranged in the inner chamber of described jack housing; Described bimetallic element and jack housing keep insulation, and this bimetallic element has at least two joint folders upwards extended or extend downwards; The top of described first isolator is positioned at the top of described bimetallic element, and the top of the first isolator is provided with groove, is provided with electrical contacts in described groove; Described electrical contacts and described bimetallic element all with described 2nd electric terminal electrically conducting.

2. supply socket as claimed in claim 1, it is characterised in that, at least two joints of described bimetallic element are clipped in and radially-inwardly bend when being heated to preset temperature.

3. supply socket as claimed in claim 1 or 2, it is characterised in that, described supply socket comprises center conductive plug-in unit;

The diapire of described bench insulator, described Socket casing, described bimetallic element and described first isolator are equipped with centre hole; Described center conductive plug-in unit is through the centre hole of the centre hole of diapire of the centre hole of described bench insulator, described Socket casing, the centre hole of described bimetallic element and described first isolator, described bench insulator and described Socket casing are connected and fixed, and described bimetallic element and described first isolator are fixed in the inner chamber of described jack housing; The top and bottom of described center conductive plug-in unit respectively with described electrical contacts and described 2nd electric terminal electrically conducting.

4. supply socket as claimed in claim 3, it is characterised in that, described center conductive plug-in unit is connected with described electrical contacts and described 2nd electric terminal.

5. supply socket as claimed in claim 3, it is characterised in that, described supply socket comprises conductive spacer, and described conductive spacer is clamped between described first isolator and described bimetallic element, and described conductive spacer is provided with a centre hole;

Described center conductive plug-in unit is through centre hole, this center conductive plug-in unit and the described conductive spacer electrically conducting of conductive spacer.

6. supply socket as claimed in claim 3, it is characterised in that, at least two of described bimetallic element engage folder and upwards extend; Described supply socket also comprises the 2nd isolator, and described 2nd isolator is clamped between the diapire of described bimetallic element and described Socket casing, and described 2nd isolator is provided with centre hole; Described center conductive plug-in unit is through the centre hole of the 2nd isolator.

7. supply socket as claimed in claim 1, it is characterised in that, at least two of described bimetallic element engage folder and extend downwards, and the top of described first isolator is positioned at the top of described bimetallic element.

8. an automobile cigarette lighter, it is characterised in that, comprise cigarette lighter plug and such as supply socket as described in any one in claim 1 to 7;

Described cigarette lighter plug comprises plug casing, Handleset and electric heating component;

Described plug casing can insert in the inner chamber of the Socket casing of described supply socket, and with described Socket casing electrically conducting;

Described Handleset is arranged on the upper end of described plug casing, and this Handleset comprises an operation handle arm, and described operation handle arm can carry out flexible motion by resisting the bias voltage of elastic element;

Described electric heating component is arranged on the lower end of described plug casing, and described electric heating component comprises heating unit, conducting sleeve and central fastener; It is peripheral that described conducting sleeve is centered around described heating unit, and described heating unit and described conducting sleeve and described Handleset are linked together by described central fastener, and described central fastener and described plug casing electrically conducting; Described heating unit has the 3rd electric terminal and the 4th electric terminal, described 3rd electric terminal and described central fastener electrically conducting, described 4th electric terminal and described conducting sleeve electrically conducting;

Described heating unit can be followed described operation handle arm and be moved together, and has stand-by station and on-position; Wherein, when described operation handle arm is not pressed, described heating unit is in described stand-by station, described conducting sleeve does not contact with the bimetallic element in described supply socket and described heating unit is not energized, when described operation handle arm is pressed, described heating unit is in described on-position, and at least two joint folders of the bimetallic element in the sidewall of described conducting sleeve and described supply socket are engaged with each other so that described heating unit is energized.

9. automobile cigarette lighter as claimed in claim 8, it is characterised in that, when heating unit is in described on-position, the inner side-wall of described conducting sleeve is engaged with each other with at least two outer sides engaging folder of the bimetallic element in described supply socket.

10. automobile cigarette lighter as claimed in claim 8, it is characterized in that, described cigarette lighter plug comprises the bi-metal plate on the roof being stacked in described conducting sleeve from bottom to up successively, insulation pad and conductive spacer, the roof of described conducting sleeve, described bi-metal plate, described insulation pad, described conductive spacer is equipped with centre hole, described central fastener is through the centre hole of the roof of conducting sleeve, the centre hole of bi-metal plate, the centre hole of insulation pad and the centre hole of conductive spacer, this central fastener keeps insulation with conducting sleeve and bi-metal plate respectively, and with conductive spacer electrically conducting,

Described bi-metal plate is provided with breach with described insulation pad in corresponding position, it is provided with socle girder in the breach of bi-metal plate, when described bi-metal plate is heated to predetermined safety temperature, described socle girder can be bent upwards, and contacts through corresponding breach on described insulation pad with described conductive spacer.

11. automobile cigarette lighters as claimed in claim 8, it is characterized in that, described heating unit is made up of the resistive material silk of spirrillum or resistive material band, and described 3rd electric terminal is positioned at the resistive material silk of this spirrillum or the center of resistive material band, and is connected with described central fastener; Described 4th electric terminal is positioned at the resistive material silk of this spirrillum or the periphery of resistive material band.