JPS6143104Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a cigarette lighter with a circuit breaker. Specifically, when the heater element overheats, heat is quickly transferred to the breaker to open the circuit, and the circuit can be closed and repaired with a simple operation. This is what I did.

In cigarette lighters for automobiles and the like, if the knob is pressed in incorrectly, there is a risk that the heater element will overheat. To prevent this, various types of thermal fuses have been conventionally provided in which a temperature fuse is interposed in the circuit between the power supply and the bimetal that holds the heater element, and the fuse blows to open the circuit. Heat transfer was slow and it sometimes did not work effectively, and there were also problems that could not be easily repaired after the fuse blew and the circuit opened.

This invention aims to solve the above-mentioned problems.As a cigarette lighter with a circuit breaker, a pair of heater case holding parts that fit and hold the heater case on the plug side when pushed in are made of bimetallic metal that protrudes forward from both sides of the bottom wall. A front end surface of a breaker having a pair of rearward protrusions protruding backwards opposite to the heater case holding part is coupled to the bimetal bottom wall, and a bent movable piece is formed at the tip of the rearward protrusions of the breaker. On the other hand, a fixed contact cup is attached to the terminal connected to the power source of the vehicle body, and an engaging part that engages with the movable piece is formed on the fixed contact cup, and the bimetal and breaker are fixed to the bimetal terminal attached to the bottom wall of the body. A spring is compressed between each contact cup through an insulator, and when the movable piece disengages from the engaging part during overheating, the spring separates the fixed contact cup from the movable piece to open the circuit, and the spring The device is characterized in that when the fixed contact cup is pushed in against the resistance, the movable piece and the engaging part engage to close the circuit. To provide a cigarette lighter with a circuit breaker, in which a kit breaker is bonded so that heat is quickly transferred to the breaker, and after the circuit breaker opens the circuit, the circuit can be closed and restored with a simple manual connection. It is something to do.

This invention will be explained in detail below with reference to embodiments shown in the drawings.

A body case 2 is attached to a hole 1a formed in a mounting panel 1 of an automobile, and a plug 3 is loaded into the body case 2 so as to be pushable and pullable. The structure of the plug 3 is conventionally known, and when a knob 5 fixed to a plug holder 4 is pressed, the plug holder 4 protrudes inward against a compression spring 6 and connects the heater connected with a rivet via an insulator 7. A case 8 is pushed into the body case 2 and fitted with a bimetal 10. A heater element 9 is connected and built into the heater case 8.

As shown in the figure, the bimetal 10 has a pair of heater case holding parts 10 protruding from both ends of the bottom part 10a.
b, 10b are provided, and a bimetal terminal mounting hole 10c is bored in the bottom portion 10a. The front ends 17a of the inverted breakers 17 are arranged so as to overlap with each other on the bottom 10a of the bimetal 10, and are fixedly attached with rivets 23. A pair of rear protrusions 17 are provided at both ends of the front end 17a of the breaker 17 in the direction opposite to both ends of the bimetal bottom 10a.
b, 17b are provided, and movable pieces 17c, 17c bent outward are formed at the tips of the protrusions 17b, 17b. The rear protruding parts 17b, 17b are the heater case holding parts 10b, 10 of the bimetal 10.
b and in the opposite direction to the mounting hole 10c, respectively,
Moreover, it protrudes in the front-back direction. The breaker 17
A mounting hole 17d is also formed in the front end portion 17a of the bimetallic mounting hole 17a so as to communicate with the bimetal mounting hole 10c.

On the body case 2 side, the breaker 17 and the bimetal 10 are arranged inside the case bottom wall 2a through a bimetal insulator 11, and a hole 10c is bored in the center of the bimetal 10, the breaker 17, and the bimetal insulator 11. , 17d, 11
A bimetal terminal 12 is passed through a, and a stopper is attached to the tip of the bimetal terminal 12 to lock it to the bimetal. The rear side part of the bimetal terminal 12 is made to protrude outward from the case bottom wall 2a, and after passing the protruding part through each hole of the cover 13, washer 14, and insulator 15, the nut 16 is tightened via a washer. , the bimetal 10 and the like are fixed to the body bottom wall 2a.

Since the breaker 17 is provided with the rear protrusion 17b, the bimetal insulator 11, the washer 14,
Notch grooves 10b, 1 facing insulator 15
4a and 15a, and after passing the rear protrusion 17b through the holes of the body bottom wall 2a and cover 13 from the notch groove 11c, and inserting the notch grooves 14a and 15a,
A movable piece 17c at the tip protrudes rearward.

On the other hand, a fixed contact cup 20 is attached via an insulating cover 19 to the front side of the terminal 18 whose rear end is connected to a power source on the vehicle body side. As shown in the figure, the fixed contact cup 20 has a cylindrical shape with an opening at the front.
The terminal mounting hole 20b is provided in the bottom wall 20a, and an annular engagement portion 20d bent outward is formed at the tip (front end) of the peripheral wall 20c, and the breaker rear protrusion 17b is formed in the engagement portion 20d. The terminal 18 is connected to the bimetal 10 via the fixed contact cup 20 and the breaker 17. Further, an insulator 21 is disposed on the inner surface of the bottom wall 20a of the fixed contact cup 20 so as to fit into the head of the terminal 18, and the insulator 21 has a front recess 21a.
A spring 22 is compressed between the insulator 15 and the insulator 15 attached to the bimetal terminal 12. Therefore, when the engaging portion 20d of the fixed contact cup 20 disengages from the movable piece 17c of the breaker 17, the fixed contact cup 20 is pushed rearward together with the cover 19 and the terminal 18.
The peripheral wall 20c of the fixed contact cup 20 is surrounded by the insulating cover 19 with a gap therebetween, and the insulating cover 19 is surrounded by the cover 13, and the movable piece 17c and the engaging portion are surrounded by the insulating cover 19. 20d is disengaged, and the fixed contact cup 20 and cover 1
9 is pushed backward, the bottom wall 19 of the cover 19
a is held in contact with the rear end locking portion 13a of the cover 13.

In the cigarette lighter with the above structure,
Normally, as shown in the figure, the engaging portion 20d of the fixed contact cup 20 and the movable piece 17c of the breaker 17 are in a state of engagement against the biasing force of the spring 22, and the power supply current is supplied from the terminal 18 to the fixed contact. Bimetal 10 via cup 20 and breaker 17
flows directly to. Then push in knob 5,
The heater case 8 is attached to the holding part 10b of the bimetal 10.
When the two are fitted together, current flows from the bimetal 10 to the heater element 9 via the heater case 8 and heats the heater element 9. When the specified temperature is reached,
The bimetal holding portion 11b opens and the heater element 9 is automatically returned to the front by the spring 5. If you make a mistake and continue to push the knob 5 even after the predetermined temperature has been reached, the heater element 9 will overheat and the heat will be transferred to the heater case 8, bimetal 10,
It is transmitted to the breaker 17 and the fixed contact cup 20,
As the movable piece 17c of the breaker 17 opens outward in the same way as the bimetal holding part 10b, it disengages from the engaging part 20d of the fixed contact cup 20, and the fixed contact cup 20 is pushed rearward by the spring 22. , away from the movable piece 17c of the breaker 17. Therefore, the power supply current circuit is in an open state to prevent overheating.

When the circuit is open, the fixed contact cup 20 is held by the insulating cover 19, and the insulating cover 19 is maintained in contact with the cover locking portion 13a. In this state, when the terminal 18 is pushed forward against the spring 22, the insulating cover 1
9. The fixed contact cup 20 moves forward and engages the engaging portion 20d.
is fitted into the movable piece 17c of the breaker 17 and returns to the state of closing the circuit.

Furthermore, in the embodiments described above, the bimetal 10 and the breaker 17 were stacked on top of each other and fixed with rivets 23, as shown in FIGS.
As shown in the exploded perspective view of FIG. 6, the bimetal 10 and the breaker 17 can be joined together and caulked with the bimetal terminal 12 through the bottom center holes 10c and 17d.

Further, in the above embodiment, when the protruding portion 17b of the breaker 17 is overheated, the movable piece 17 of the breaker deforms in the outer radial direction of the fixed contact cup 20.
However, by changing this, the direction in which the breaker material is laminated is reversed, that is, when it is overheated, the protrusion 17b' of the breaker 17 is fixed. It is also possible to deform the contact cup 20 in the inner diameter direction and fit the movable piece 17c' of the breaker 17 to the inner diameter side of the fixed contact cup 20, as shown in FIG.

Furthermore, the movable pieces 17c and 17c' of the breaker 17 can be bent inward, and the bimetal 1
0 and the breaker 17 can be fixed perpendicularly to each other.

As is clear from the above explanation, according to the cigarette lighter of this invention, a circuit breaker is bonded to a bimetal, a movable piece is formed on the breaker, and a fixed contact is attached to a terminal that connects the movable piece to a power source. By engaging with the engaging portion of the cup, when the heater element heats up to a predetermined temperature or higher, the heat is quickly transferred to the movable piece of the breaker integrally joined to the bimetal, opening the circuit.
The breaker operates effectively. Therefore, overheating is quickly and reliably prevented, and even after the circuit is opened, the terminal can be restored to its original state with an extremely simple operation of pushing in the terminal.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the cigarette lighter according to this invention, Fig. 2 is an enlarged view of the main part of Fig. 1, Fig. 3 is a perspective view of the bimetal and breaker, Fig. 4 is a sectional view of Fig. 3, and Fig. 5 is a sectional view of the cigarette lighter of this invention. 6 is an exploded perspective view of other main components, FIG. 6 is a perspective view of a bimetal and a breaker, and FIG. 7 is an enlarged view of essential parts showing a modification of FIG. 2. 2...Body, 3...Plug, 5...Knob, 8
... Heater case, 9 ... Heater element, 1
0... Bimetal, 10b... Heater case holding part, 12... Bimetal terminal, 17... Breaker, 17c... Movable piece, 18... Terminal, 19... Insulation cover, 20... Fixed contact cup, 20d ...Engagement part, 22...Spring.

Claims (1)

[Scope of utility model registration request] A pair of heater case holding parts that fit and hold the heater case on the plug side when pushed in are made of bimetal that protrudes forward from both sides of the bottom wall, and have a pair of rearward protruding parts that protrude to the rear opposite to the heater case holding parts. The front end surface of the breaker is connected to the bimetal bottom wall, and a bent movable piece is formed at the tip of the rear protrusion of the breaker, while a fixed contact cup is attached to the terminal connected to the power supply of the vehicle body, and a fixed contact cup is attached to the fixed contact cup. In addition to forming an engaging part that engages with the movable piece, a spring is compressed via an insulator between the bimetal terminal and the fixed contact cup, which attach the bimetal and breaker to the bottom wall of the body, so that the movable piece is movable when overheated. When the contact piece disengages from the engaging part, the spring separates the fixed contact cup from the movable piece to open the circuit, and when the fixed contact cup is pushed against the spring, the movable piece and the engaging part engage. A cigarette lighter with a circuit breaker, characterized in that it has a configuration in which the circuit is closed.