JPH0227337Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a cigarette lighter with an improved assembly structure at the rear of the cigarette lighter body so as to be suitable for automatic assembly.

[Prior Art] In a conventional cigarette lighter body, a power supply terminal to which a bimetal is fixed to the front end for supplying power to the lighter plug is passed through the rear end of the cigarette lighter body through an insulating material. Insert the insulating stand, first terminal, insulating washer, second terminal, flat washer, and spring washer in order from the rear, and then screw the nut onto the rear end of the power supply terminal to tighten the whole thing together. I was trying to do that.
However, such a conventional structure has the disadvantage that it is difficult to automate the assembly due to the large number of parts that are inserted into the power supply terminal from the rear, and the assembly cost is high. In addition, although both ends of the temperature fuse are fixed to the first and second terminals in advance by caulking, since the first and second terminals are inserted into the power supply terminal separately, it is difficult to assemble them. The temperature fuse was twisted, which had a negative effect on the caulked portion.

[Purpose of the invention] The present invention was made in view of the above circumstances, and its purpose is to automatically attach to the cigarette lighter body by assembling a plurality of parts fixed to the rear surface of the cigarette lighter body in advance to form a subunit. To provide a cigarette lighter that can be easily assembled, can reliably prevent a temperature fuse from being twisted during assembly, and does not adversely affect a caulked part.

[Summary of the invention] The present invention includes a power supply terminal that is electrically connected to the power supply part of the cigarette lighter body and has a threaded portion formed on the outer periphery, which protrudes from the rear surface of the cigarette lighter body, and a through hole that allows the power supply terminal to pass through. an insulating stand that is in contact with the rear surface of the cigarette lighter main body, and an insulating washer is interposed between the first and the second
a temperature fuse having both ends electrically connected to the first and second terminals, and a temperature fuse formed in a cylindrical shape to allow the power supply terminal to pass through the second terminal. By fixing the second terminal to the inner surface of the insulating stand by open caulking, the second terminal is integrated with the insulating stand together with the first terminal and the insulating washer to form a caulking part that constitutes a subunit, and the power supply terminal A nut is provided to fix the subunit to the rear surface of the cigarette lighter main body by being screwed onto the threaded part of the cigarette lighter, so that a plurality of parts integrated as a subunit can be fixed to the rear surface of the cigarette lighter main body at once, It is characterized by easy automatic assembly.

[Example] An example of the present invention will be described below with reference to the drawings. Reference numeral 1 denotes a mounting panel located, for example, in front of the driver's seat of an automobile, in which a substantially circular mounting hole 2 is bored. Reference numeral 3 denotes a cigarette lighter body formed in a substantially cylindrical shape, which is fitted into the inner peripheral part of the mounting hole 2 from the front side, and the flange 3a at the front edge of this is in contact with the front side of the mounting panel 1. There is. 4
is a cylindrical holder, which is fitted onto the outer periphery of the cigarette lighter body 3 from the rear. Reference numeral 5 designates a male threaded portion provided on the outer circumference of the rear end of the cigarette lighter body 3, and a nut 6 is screwed into the male threaded portion 5 to press the holder 4 against the back side of the mounting panel 1, thereby attaching the cigarette lighter body 3 to the mounting panel 1. It is fixed.
Reference numeral 7 denotes a lighter plug that can be attached and removed from the front side of the cigarette lighter body 3. This lighter plug has a body 10 having a knob 9 slidably provided in a cylindrical attachment guard 8, and a rear end of the body 10 on the opposite side from the knob 9. A shallow container-shaped heater case 11 is electrically insulated and fixed to the body 10, and a heater 12 with a heating wire wound in a spiral is housed in the heater case 11. The outer peripheral end of the heater 12 is electrically connected to the heater case 11, and the inner peripheral end of the heater 12 is electrically connected to the body 10 via a rivet 13 and an end plate 14. A compression coil spring 15 is installed between them to always bias the body 10 outward, and when the knob 9 is not pressed, the outer end of the body 10 (the left end in FIG. 1) is the left end of the attachment guard 8. The situation is even. Reference numeral 16 denotes a bimetal as a power feeding section provided in the cigarette lighter body 3 so as to face the lighter plug 7, and this is electrically insulated from the cigarette lighter body 3 via an insulator 17. 18 is insulator 1
A bimetal terminal as a power supply terminal that passes through the through hole 17a of No. 7, and has an insulator 17 at the front end.
The bimetal 16 has a brim 18a that comes into contact with the front side of the brim 1, and the center portion of the bimetal 16 is caulked and fixed to the front end side of the brim 18a, so that the bimetal 16 is attached to the brim 1.
It is held between 8a and 8a. This bimetal terminal 18 is connected to a through hole 3 provided in the rear plate 3b of the cigarette lighter body 3 via an insulator 17.
c is an electrically insulated subunit, which will be explained below. That is, 20 is an insulating stand having a tapered through hole 20a in the center,
A recess 20b is formed on one side of this. 2
1 is a first plate in which the flat part 21a is fitted into the recessed part 20b.
In this terminal, a through hole 21b having a larger diameter than the recess 20a is formed in the center of the flat part 21a, and a male terminal part 21c is formed by bending one end of the flat part 21a at a substantially right angle. , and the other end is bent into a substantially U-shape to form a connecting portion 21d and a holding portion 21.
e is formed. A second terminal 22 is superimposed on the rear surface of the flat part 21a of the first terminal 21 via an insulating washer 23 formed in a thin annular shape, and one end of this is bent into a substantially U-shape for connection. A portion 22a and a holding portion 22b are provided. Reference numeral 24 denotes a temperature fuse whose circumferential portion is covered with a coating 24a, which is cut into a predetermined length in advance, the coating 24a is peeled off at both ends, and the central portion is bent at a substantially right angle. Both ends are connection parts 21
d and 22a, and both ends of the covering 24a are caulked and fixed to the holding parts 21e and 22b, respectively. 25 is the second terminal 22
This caulking part 25 is formed into a cylindrical shape by burring at the center of the insulating washer 23.
The through hole 20a is inserted through the inner circumference of the through hole 20a and the through hole 21b.
The through hole 20a is inserted into the through hole 20a by opening and caulking.
The first terminal 21, the insulating washer 23, and the second terminal 22 are integrated into the insulating base 20. Thus, the subunit 19 is attached to the threaded portion 1 of the bimetal terminal 18.
By inserting the through hole 20a and the caulking part 25 into the outer circumference of the cigarette lighter body 3, the insulating stand 20 is brought into contact with the rear plate 3b of the cigarette lighter main body 3, and the threaded part 18
It is fixed to the cigarette lighter main body 3 by inserting the washer 26 into the cigarette lighter body 3 and screwing the nut 27 into the threaded portion 18b. And male terminal part 2
A power cord wire (not shown) is connected to 1c, and the power supplied to the male terminal portion 21c is transmitted through the first terminal 21, the temperature fuse 24, and the second terminal 22 in this order. It is supplied to the bimetal terminal 18.

Next, the operation of the above configuration will be explained. First, in normal use, when the knob 9 of the lighter plug is pushed in, the body 10 and heater case 11
is moved in the direction of arrow A against the spring force of the compression coil spring 15, so that the outer circumference of the heater case 11 is held in the pressed state by the bimetal 16, and the heater 12 is moved in the direction of arrow A against the spring force of the compression coil spring 15. One end is connected to the positive terminal of the battery via the heater case 11, bimetal 16, bimetal terminal 18, second terminal 22, temperature fuse 24, first terminal 21, and a power cord (not shown). Rivets 1 at the end
3. The body is grounded through the end plate 14, the body 10, the battery guard 8, and the cigarette lighter main body 3, and the heater 12 of the lighter plug 7 is energized and generates heat. When the heater 12 generates heat and reaches a predetermined temperature, the bimetal 16 is bent and released from the heater case 11, and the body 10 and the heater case 11 return to their original positions as shown in FIG. Since it is ready for ignition, the lighter plug is pulled out from the cigarette lighter body 3 by gripping the handle 9, and the cigarette is ignited.

Next, the action at the time of failure will be explained. That is,
For example, if the bimetal 16 is deformed due to improper handling and the lighter plug remains pushed in and does not return, causing an abnormal temperature rise in the heater 12 of the lighter plug 7, the heat from the heater 12 will be transferred to the bimetal terminal 18, The temperature is transmitted to the temperature fuse 24 through the second terminal 22, and the temperature fuse 24 is immediately blown, cutting off the current-carrying path between the first terminal 21 and the second terminal 22, and the power supply to the heater 12 is interrupted. Since the supply is cut off, the heater 12 is prevented from overheating further. In this case, the coating 24a also melts as the temperature fuse 24 melts, but the coating 24a comes to cover the outer periphery of the melted temperature fuse 24.
It is possible to prevent the melted temperature fuse 24 from short-circuiting the power supply parts of other electric circuits.

According to the above configuration, it is only necessary to insert the pre-integrated subunit 19 from the rear of the bimetal terminal 18, insert the spring washer 26, and then screw the nut 28 onto the threaded portion 18b. The number of parts to be inserted into the bimetal terminal serving as the power supply terminal can be significantly reduced compared to the conventional structure, and therefore automatic assembly can be easily performed using an automatic assembly machine. Also, in the above configuration,
With the first and second terminals 21 and 22 overlapped in a plane, both ends of the temperature fuse 24 can be caulked and fixed to the connecting parts 21d, 22a and the holding parts 21e, 22b, and the first and second terminals can be fixed in that state.
Since the terminals 21 and 22 of the terminals 21 and 22 can be caulked and fixed to the insulating base 20, twisting of the temperature fuse 24 can be reliably prevented, and therefore, any adverse effects on the caulked portions can be prevented.

[Effects of the invention] As is clear from the above description, the present invention facilitates automatic assembly of the cigarette lighter body by pre-assembling a plurality of parts fixed to the rear surface of the cigarette lighter body to form a subunit. To provide a cigarette lighter which can reliably prevent a temperature fuse from being twisted during assembly and which does not adversely affect a caulked part.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a longitudinal sectional view, FIG. 2 is a rear view, and FIG. 3 is an exploded perspective view of a subunit. In the drawing, 3 is a cigarette lighter body, 7 is a lighter plug, 12 is a heater, 16 is a bimetal (power supply part), 18 is a bimetal terminal (power supply terminal), 19 is a subunit, 20 is an insulating stand,
21 is a first terminal, 22 is a second terminal, 23 is an insulating washer, and 24 is a temperature fuse.

Claims (1)

[Scope of utility model registration request] In a device that generates heat by supplying power to the heater of the lighter plug from a power supply part of the cigarette lighter body, the power supply is electrically connected to the power supply part, protrudes from the rear surface of the cigarette lighter body, and has a threaded part formed on the outer periphery of the rear end. a terminal, an insulating stand having a through hole passing through the power supply terminal and abutting against the rear surface of the cigarette lighter main body, and first and second insulating bases disposed on the rear side of the insulating stand with an insulating washer interposed therebetween. 2 terminals and
A temperature fuse is electrically connected at both ends to the first and second terminals, and the second terminal is formed into a cylindrical shape to allow the power supply terminal to pass through, and is opened and caulked to the inner surface of the insulating base. A caulking part that integrates the second terminal with the first terminal and the insulating washer to the insulating base to form a subunit by fixing it to the side, and a caulking part that is screwed onto the threaded part of the power supply terminal to form the subunit. and a nut fixed to the rear surface of the cigarette lighter body.