JPH0412366Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention consists of overlapping a temperature fuse and a contact plate spring, installing them inside the bottom of an inner case, and then using the overlapping temperature fuse and contact plate spring. The present invention relates to an abnormal overheat prevention structure for a vehicle cigarette lighter in which a combination body with a spring is interposed between the inner bottom surface of an inner case and a bimetal support base.

[Conventional technology]

Traditionally, abnormal overheating prevention devices for automobile cigarette lighters have an insulating heat-melting member for preventing abnormal overheating that melts during abnormal overheating and cuts off power supply, as disclosed in Japanese Utility Model Application No. 60-50360. It is something to do. The insulating heat-melting member, insulator, etc. are arranged in a lid-shaped thermosilter connected to the end face of the inner case. Inside the lid-shaped thermosilter, there are an insulating heat-melting member, a leaf spring, an insulator, a ground terminal, a positive insulator,
A thermo cover, a spring washer, and a power terminal are provided.

[Problem that the invention attempts to solve]

The above-mentioned abnormal overheating prevention device for an automobile cigarette lighter has a problem in that it requires a large number of parts to prevent abnormal overheating and requires a large number of assembly steps.

[Means for solving problems]

The abnormal overheating prevention structure for a vehicle cigarette lighter according to the present invention includes a bimetal that elastically fits into the heater cap of the cigarette lighter, a shaft to which the bimetal is crimped and fixed, and a bimetal support for fixing the shaft. In this cigarette lighter, a temperature fuse and a contact leaf spring are superimposed and interposed between the inner case and a bimetal support base. This provides an abnormal overheat prevention structure for a vehicle cigarette lighter that reduces the number of parts configured to prevent abnormal overheating and reduces the number of assembly steps.

[Effect]

The structure for preventing abnormal overheating of a vehicle cigarette lighter according to the present invention has a temperature fuse, a contact plate spring, etc. arranged inside the inner case to protect the temperature fuse, etc., so there is no need for components such as a thermosilter, and parts Reduces the number of points and assembly man-hours, and
The overall length of the inner case can be designed to be short, allowing for miniaturization.

〔Example〕

First, an embodiment of the structure for preventing abnormal overheating of a vehicle cigarette lighter according to the present invention will be described in detail based on the accompanying drawings.

1 is an inner case that is inserted into an instrument panel (not shown). 2 is the inner case 1
It is a power terminal arranged at the end of the mounting bracket 3.
It is fixed by 4 is a set screw for fixing the mounting fitting 3 to the inner case 1, and is screwed onto the temperature fuse 6 via a spring washer 5. The temperature fuse 6 is formed from an insulating heat-melting member,
It is approximately disk-shaped. A cylindrical portion 6a that fits into the inner case 1 and the insulating plate 7 is formed in the center, and a stepped portion 6b that engages with the protruding piece 8a of the contact plate spring 8 is formed at the end. The height of the stepped portion 6b is equivalent to the thickness of the contact plate spring 8. The insulating plate 7 is an insulating member that is fixed to the outer surface of the bottom of the inner case 1 and prevents the terminal welded portion 8b of the contact plate spring 8 from coming into contact with the inner case 1. The insulating plate 7
A shaft hole 7a for inserting the shaft 9 through the center and a hole 7b for protruding the terminal welded portion 8b of the contact plate spring 8 are formed on the outside. The contact plate spring 8 is a substantially ring-shaped member, with two projecting pieces 8a and 8c protruding toward the center, and an L-shaped member extending outwardly.
A terminal welding portion 8b bent into a shape is provided protrudingly, and the insulator 1 is provided between the protruding piece 8a and the terminal welding portion 8b.
A hole 8d into which the protruding rod 10a of No. 0 is inserted is bored. The contact plate spring 8 has a protrusion 8a and a hole 8d.
is fixed by the bimetal support stand 11 and the insulator 10, and the protruding piece 8c is connected to the temperature fuse 6.
is in pressure contact with the stepped portion 6b. The vicinity of the protruding piece 8c of the contact plate spring 8 is in pressure contact with the inner wall of the inner case 1. The terminal welding portion 8b passes through the shaft hole 7a of the inner case 1 and the insulating plate 7, projects outside the inner case 1, and welds the arm harness 12 thereto. Axis 9
, a crimping part 9a for fixing the bimetal 13 on one side, a bimetal support stand 11, a temperature fuse 6, an inner case 1, an insulating plate 7, a spring washer 5, and the other side.
A screw rod 9b is formed through which the mounting bracket 3 is inserted and the set screw 4 is screwed. The contact leaf spring 8 and the insulator 10 are attached to the shaft 9.
By fixing the bimetal support stand 11 to the inner case 1, the bimetal support stand 11 is sandwiched between the bimetal support stand 11 and the inner case 1 with the contact leaf spring 8 interposed therebetween.
The protruding rod 10a of the insulator 10 is inserted through the hole 8d of the contact plate spring 8, and the bimetal support base 11
The temperature fuse 6 is inserted into the fixing hole 11a, and is fitted into the substantially C-shaped drift prevention portion 10b. The thickness of the anti-slopping portion 10b of the insulator 10 is designed to be approximately equal to the thickness of the temperature fuse 6. The width of the temperature fuse 6 is approximately equal to the width when the contact plate spring 8 and the fixed portion 10c of the insulator 10 are superimposed. The anti-slopping portion 10b of the insulator 10 has a shape that loosely fits inside the contact plate spring 8. The insulator 10 is formed of a heat-resistant insulating member, and serves to prevent members such as the contact leaf spring 8 and the inner case 1 fixed by the shaft 9 from loosening when the temperature fuse 6 is melted by heat. There is. Reference numeral 11 designates a bimetal support stand for supporting the bimetal 13, and has a fixing hole 11a formed on the temperature fuse 6 side, and a housing portion 11b for accommodating each of the temperature fuse 6, the contact plate spring 8, and the insulator 10. There is. The center portion of the bimetal 13 is crimped and fixed to the shaft 9. Reference numeral 14 represents a plug that fits into the inner case 1. Reference numeral 15 represents a heater cap that has a heater (not shown) installed therein. mate. The operating knob 16 is inserted into a knob 18 that is integrally formed at the end of the hood 17, and is fixed to the plug 14 by press-fitting the shaft 19 into the fixing member 20. The hood 17 is a substantially cylindrical member, and has a spring receiver 2 in the center.
1, and a falling-off prevention part 1 which has a curved part 17a near the approximate center to restrain the stopper 22 of the plug 14, and which engages the restraining protrusions 1a and 1b of the inner case 1 at the ends.
7b respectively. The fixed member 20 is
The resin body 23 is integrally molded inside the plug 14 . Reference numeral 21 denotes a spring receiver, which is a member for supporting the inner side of the operating knob 16 and one end of the spring 24 wound around the plug 14. The stopper 22 is engaged with the curved portion 17a of the hood 17, is formed on the plug 14, and is attached to the flange 1.
It has the role of preventing it from falling out of the hole d.

The structure for preventing abnormal overheating of a vehicle cigarette lighter according to the present invention has the above structure, and its operation will be described in detail next.

The operator holds the knob 18 at each end and inserts the plug 14 into the opening of the inner case 1 provided in the instrument panel.

Therefore, the drop-off prevention portion 17b at the tip of the plug 14
The proximal end of the knob 18 comes into contact with the surface of the flange 1d of the inner case 1 and comes to rest. Next, the operator pushes the operating knob 16 with his finger. Plug 14 in hood 17 while spring 24 is compressed
And the heater cap 15 moves to the bimetal 13 side. The plug 14 is connected to the curved portion 17 of the hood 17.
It comes to rest by hitting the stopper 22 which is in pressure contact with a. Then, the heater cap 15 can be fitted and locked to the bimetal 13. Thus, the power terminal 2, the mounting bracket 3, the set screw 4, the shaft 9, the bimetal 13, the heater, the shaft (not shown), the plug 14,
A closed circuit consisting of the stopper 22, hood 17, inner case 1, contact plate spring 8, and arm harness 12 is energized, and the heater is heated. The heat of the overheated heater is conducted to the heater cap 15, bimetal 13, etc. When the heat of the heater rises to a predetermined temperature at which the cigarette can be ignited, the bimetal 13 deforms, and due to the repulsive force of the spring 24, the heater cap 15, which has been fitted and locked to the bimetal 13, is disengaged and the inside of the hood 17 is released. The plug 14 and operation knob 16 are connected to the stopper 22.
hits the curved portion 17a of the hood 17 and comes to rest, and the hood 17 and the knob 18 move to the second position.
It protrudes outward from the inner case 1 from position A to position B shown in the figure. As for the movement of the hood 17, the fall prevention portion 17b of the hood 17 is engaged with the restraining protrusions 1a, 1b of the inner case 1, so that the hood 17 remains stationary. The knob 18 has a short skirt portion and protrudes from the instrument panel to position B, so that the operator can easily grip it and the overall length of the plug 14 can be set short.

If the heater of the cigarette lighter is overheated to a predetermined temperature due to a malfunction of the bimetal 13 while the heater is energized, the heater cap 15
If it does not release from 3, the heater will generate abnormal heat and
The area near the heater is also overheated. When the area near the heater is abnormally heated, the conductive heat is transferred to the bimetal 13.
and is transmitted to the shaft 9. When the shaft 9 is overheated, the temperature fuse 6 inserted into the shaft 9 melts or blows out.

Then, the vicinity of the protruding piece 8c of the contact plate spring 8, which was in contact with the bottom inner wall of the inner case 1 and in pressure contact with the stepped portion 6b of the temperature fuse 6, crushes the temperature fuse 6. The contact leaf spring 8 is separated from the inner case 1 by crushing the temperature fuse 6 and pushing the temperature fuse 6 out from between the bimetal support 11 and the contact leaf spring 8 . Therefore, the closed circuit can be opened and the flow of current can be interrupted. Also, the melted temperature fuse 6
is accumulated in the drift prevention portion 10b of the insulator 10, etc.

[Effect of idea]

As explained above, the structure for preventing abnormal overheating of a vehicle cigarette lighter according to the present invention includes a temperature fuse, a contact leaf spring, etc. installed inside the inner case, and
By shortening the length of the operating knob and knob, the vehicle cigarette lighter can be made smaller. Furthermore, the amount of protrusion of the operation knob and knob from the instrument panel can be reduced.

[Brief explanation of the drawing]

The attached drawings are drawings showing an embodiment of the abnormal overheating prevention structure for a vehicle cigarette lighter according to the present invention. Figure 3 is a side view, Figure 3 is a rear view, Figure 4 is an exploded perspective view of the inner case, Figure 5 is a view taken in the direction of arrow Y in Figure 1.
- It is a sectional view in the Y line direction. 1...Inner case, 6...Temperature fuse, 7...
Insulating plate, 8...Contact plate spring, 9...Shaft, 1
0...Insulator, 11...Bimetal support stand.

Claims (1)

[Scope of utility model registration request] a bimetal that fits into the heater cap of a cigarette lighter; a shaft to which the bimetal is crimped and fixed;
A bimetal support for fixing the shaft, an inner case with the bimetal support in the inner bottom, the heater cap housing the heater, the heater cap at the tip, and a cap that can be inserted into and removed from the inner case. It comprises a freely attached plug, a temperature fuse interposed between the inner bottom wall of the inner case and the bimetal support, and a contact leaf spring made of a conductive leaf spring material, and the contact leaf spring has a protrusion, and a terminal welded portion connected to the grounding harness, and constitutes an energizing circuit passing through the shaft, bimetal, heater cap, heater, plug, inner case, and contact plate spring, and when the temperature fuse melts. . An abnormal overheat prevention structure for a vehicle cigarette lighter, characterized in that the contact leaf spring is separated from the inner case.