JPS6143103Y2 - - 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, and forms the movable piece of the circuit breaker integrally with the bimetal that holds the heater element, so that heat can be quickly transmitted to the breaker, and the above-mentioned circuit To provide a cigarette lighter with a circuit breaker which can be restored by closing the circuit with a simple manual operation after the breaker opens the circuit.

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.

On the body case 2 side, the bimetal 11 is arranged inside the case bottom wall 2a via a bimetal insulator 10, and holes 10a, 1 are bored in the center of the bimetal 11 and the bimetal insulator 10.
A bimetal terminal 12 is passed through 1a, and a stopper is attached to the tip of the bimetal terminal 12 to lock it to the bimetal 11. The rear side of the bimetal terminal 12 projects outward from the case bottom wall 2a, and the projecting part is connected to the cover 13, washer 14,
After passing through each hole of the insulator 15, a nut 17 is tightened via a washer 16, thereby fixing the bimetal 11 and the like to the body bottom wall 2a.

The bimetal 11 has a shape as shown in the figure, and is provided with a pair of heater case holding parts 11c protruding forward from both sides of a bimetal insulator fitting part 11b with the hole 11a bored in the center. A pair of rear protrusions 11d are provided that are bent and protrude rearward from both sides of the central portion. The heater case holding portion 11c is provided with an inwardly bent portion to fit and hold the heater case 8, while an outwardly bent portion is provided at the tip of the rear protrusion 11d, and the bent portion is bent outward. A circuit breaker movable piece 11e is used. Bimetal 1
By providing the rear protrusion 11d in 1,
Notch grooves 10b, 14a, 1 facing the bimetal insulator 10, washer 14, and insulator 15
5a, the bimetal rear protrusion 11d is passed through the holes in the body bottom wall 2a and the cover 13 from the cutout groove 10b, and after the cutout grooves 14a and 15a are inserted, the movable piece 11e at the tip is made to protrude 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 engaging portion 20d bent outward is formed at the tip (front end) of the peripheral wall 20c, and the bimetal rear protruding portion 11d is formed in the engaging portion 20d. The movable piece 11e is formed so as to fit therein, and the terminal 18 is connected to the bimetal 11 via a fixed contact cup 20. Further, an insulator 21 is provided on the inner surface of the bottom wall 20a of the fixed contact cup 20.
is arranged so as to fit into the head of the terminal 18, and the insulator 1 is attached to the front recess 21a of the insulator 21 and the bimetal terminal 12.
A spring 22 is compressed between 5 and 5. Therefore, when the engaging portion 20d of the fixed contact cup 20 disengages from the movable piece 11e of the bimetal 11,
Cover 19 with fixed contact cup 20, terminal 1
It is made to push out backwards together with 8. The peripheral wall 20c of the fixed contact cup 0 is surrounded by the insulating cover 19 with a gap, and the insulating cover 19 is surrounded by the cover 13, and the movable piece 11e and the engaging portion are surrounded by the insulating cover 19. 20d is disengaged and the fixed contact cup 20 and the cover 19 are pushed out rearward, the bottom wall 19a of the cover 19 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 11d of the bimetal 11 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. It flows directly to the bimetal 11 via the cup 20. Then, push in knob 5 and press bimetal 11.
When the heater case 8 is fitted into the heater case holding portion 11c, the heater case 8 is removed from the bimetal 11.
A current flows through the heater element 9 through the heater element 9 to heat the heater element 9. When the predetermined temperature is reached, the heater case holding portion 11c opens and the heater element 9 is automatically returned forward 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 11,
It is transmitted to the fixed contact cup 20, and the bimetal 11
The movable piece 11e deforms inward and disengages from the engaging portion 20d of the fixed contact cup 20, and the fixed contact cup 20 is pushed rearward by the spring 22 and separated from the movable piece 11e of the bimetal 11.
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 onto the movable piece 11e of the bimetal 11 and returns to the state where the circuit is closed.

Moreover, by changing the above embodiment, the bimetal 11
The movable piece 11e can also be bent inward.

As is clear from the above explanation, according to the cigarette lighter of this invention, a movable piece for a circuit breaker is formed integrally with a bimetal, and the movable piece is engaged with a fixed contact cup attached to a terminal connected to a power source. By engaging with the joint,
If the heater element overheats above the specified temperature,
Heat is quickly transferred to the movable breaker piece formed integrally with the bimetal, opening the circuit and effectively operating the breaker. Therefore, overheating is quickly and reliably prevented, and even after the circuit is opened, the current state can be restored with an extremely simple operation of pushing in the terminal.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a cigarette lighter according to this invention, FIG. 2 is an enlarged view of the main parts of FIG. 1, and FIG. 3 is an exploded perspective view of the main components. 2...Body, 3...Plug, 5...Knob, 8
... Heater case, 9 ... Heater element, 1
1... Bimetal, 11b... Heater case holding part, 11d... Rear protrusion part, 11e... Movable piece,
12... Bimetal terminal, 18... Terminal, 19... Insulating cover, 20... Fixed contact cup, 20d... Engaging portion, 22... Spring.

Claims (1)

[Scope of utility model registration request] For circuit breakers, a rear protrusion that protrudes rearward is integrally formed with the bimetal that fits and holds the heater case on the plug side when it is pushed in, and the protrusion protrudes rearward from the bottom wall of the body and is bent at the protruding end. A bimetal that forms a movable piece, has a fixed contact cup attached to a terminal connected to a power source of the vehicle body, forms an engaging part on the fixed contact cup that engages with the movable piece, and attaches the bimetal to the bottom wall of the body. A spring is compressed between the terminal and the terminal via an insulator, and when the movable piece and the engaging part disengage from each other when the movable piece is overheated, the spring separates the fixed contact cup from the movable piece, opening the circuit, and resisting the spring. A cigarette lighter with a circuit breaker, characterized in that when the fixed contact cup is pushed in, the movable piece and the engaging part engage to close the circuit.