JPS5833739Y2 - Parts storage structure for small electrical equipment - Google Patents

Description

[Detailed description of the invention] This invention relates to the improvement of small electric devices such as dry cell discharge gas lighters, flashlights, and electric razors. This relates to a structure for storing necessary parts such as electronic circuit parts in a cylindrical case, and its purpose is to easily store and hold a chassis for supporting a printed circuit board on which the above-mentioned necessary parts are mounted. It provides:

For example, in conventional dry battery-powered discharge gas lighters, in order to simplify the structure, electrical components for generating high voltage such as a capacitor, inverter, and pulse transformer for generating high voltage are mounted on a single printed circuit board, and the main body In order to easily and securely store this part in the case, we divided the above case into two parts, attached the printed circuit board to one case with screws, and covered it with the other case to store and hold it. It's intimidating.

However, this kind of two-part woos (1) is,
Although the assembly process is simplified, on the other hand, 2
Due to the abutted parts of the split cases, products that generate high voltage, such as discharge gas lighters, have gaps in the abutted parts, making it easy for dust to enter the case and damage the high voltage generation circuit. This two-divided case storage structure is not recommended because it tends to cause internal short circuits or deterioration of characteristics, or when used in the kitchen, water droplets may seep in and cause electrical leakage, creating a dangerous situation for the user. Discharge gas lighters mentioned above have such drawbacks that are not desirable! , including but not limited to
For example, electric shavers equipped with a control circuit for charging a rechargeable battery have the same drawbacks as in the past.

In order to eliminate the above-mentioned drawbacks, this invention consists of integrally molding the main body case into a cylindrical shape, and making the other end of the cylindrical case with an open end a slightly smaller diameter than the one end, so that the inner wall is A synthetic resin chassis that is tapered and has elasticity is formed into a semi-cylindrical shape with a slightly larger diameter than the inner wall shape on the other end side, and a printed circuit board with required parts mounted on this chassis. In the installed state, the chassis is pushed into the cylindrical case from the opening side at one end, and the chassis is contracted in the radial direction to be elastically held within the cylindrical case.

Embodiments of this invention will be described below with reference to the drawings, taking a dry battery type discharge gas lighter as an example.

1 and 2, reference numeral 1 denotes a cylindrical case made of ABS resin with a circular cross section, with one end 2 open, and a battery replacement lid 4 attached to a threaded part 3 provided in the one end opening 2. It can be opened and closed by screwing it on.

Also, this cylindrical case 1 has one end 2 (inner diameter 31.5 mm)
The other end side 5 (inner diameter 29.5 mm) is made slightly smaller in diameter, and the inner wall is tapered from one end side 2 to the other end side 5 so that this diameter difference is 2 mm.

6 is a synthetic resin chassis having insulation resistance and elasticity, such as polypropylene resin, polypropylene resin, or acrylic styrene resin with high elasticity, and has a slightly larger diameter (inner diameter 29 .8mm
), and a printed circuit board 7 is fixed to this chassis 6 with screws 36.

An inverter transformer 8, an oscillation transistor 9, a drive resistor 10, a capacitor 11, a control element 12, and a high voltage generation transformer 13 are mounted on the printed circuit board 7, and an L-shaped contact plate 14 is soldered to the front end side. and
Further, on the rear end side of the battery receiver of the chassis 6, a conductive plate 17 is soldered to the center of the plate portion 15 with an eyelet 16.

The L-shaped contact plate 14 is fixed by locking the locking protrusion 14b at the lower part of the rising part 14a to the boss 18 of the chassis 6, and by curling the upper part of the rising part 14a to form a cylindrical case. It is always in elastic contact with a brass lead pipe 21 which is inserted into the front wall 19 of 1 and fixed with a nut 20.

A lead wire 22 connected to the output end of the high voltage generating transformer 13 is inserted through the lead pipe 21, and a discharge plug 23 is connected to the tip of the lead wire 22.

The discharge plug 23 consists of an insulating piece 24 made of Teflon resin and a discharge pin 25.
The pointed portion 25a of the discharge pin 25 is inserted from the opposite side into the node wire 22 inserted into the node wire 4a to establish electrical continuity.

The exposed portion of the discharge pin 25 is set at the center of the discharge window 26 at the tip of the lead pipe 21.

27 is a lead plate which also serves as a switch contact plate, and has a switch knob 28 so that its tip comes into contact with and separates from the lead pipe 21; It is electrically connected to the conductive plate 29 of No. 4.

30 is an eyelet for fixing the lead plate 27. Conduction plate 29
A conductive spring 31 is mounted to press the battery 32 toward the chassis 6, and the battery receiver of the chassis 6 is brought into contact with the conductive plate 17 of the plate portion 15.

The chassis 6 is pressed by this battery 32, and the chassis 6
The front end thereof abuts against the front wall 19 on the other end side 5 of the cylindrical case 1.

In the figure, 33 is a decorative plate, 34 is a hanger pivotally attached between the decorative plate 33 and the cylindrical case 1, and 35 is a lead pipe 2.
1. This is a washer for fixing.

Next, the storage structure of the chassis 6 in which the printed circuit board 7 is installed will be specifically explained.

First, place the printed circuit board 7 on the chassis 6, and
The L-shaped contact plate 14 is press-fitted into the boss 18 of the chassis 6, and the tip of the conductive plate 17 of the plate part 15 of the battery receiver of the chassis 6 is inserted into the printed circuit board 7, and soldered from the opening A of the chassis 6. Then, using screws 8, the printed circuit board 7 is completely fixed and installed.

Next, if this chassis 6 is inserted through the opening 2 on the one end side of the cylindrical case 1 and the insertion force is gradually increased, this chassis 6 will be slightly larger than the inner wall shape of the other end side 5 of the cylindrical case 1. Since it has a semi-cylindrical shape with elasticity, the chassis 6 contracts in the radial direction as shown by the broken line arrow B in FIG. 4, and exhibits repulsion elasticity as shown by the solid line arrow C. and is elastically held within the cylindrical case 1.

In this case, since the parts of the chassis 6 that are most likely to be elastically deformed are the ends of the semi-cylindrical chassis 6, a recessed groove 37 is formed in the center of the chassis 6 in order to make this elastic repulsive force act more effectively. At the same time, a guide protrusion 38 is provided on the inner wall of the cylindrical case 1, and the upper surface of the guide protrusion 38 is brought into contact with the recessed groove 37, so that the central portion of the chassis 6 floats above the inner wall of the cylindrical case 1. so that both end edges of the chassis 6 are brought into positive contact with each other.

Further, the printed circuit board 7 is fixed to the chassis 6 with screws 36, and the screw holes 39 of the printed circuit board 7 are elongated holes on the elastic deformation side of the chassis 6, that is, in the lateral direction.
Regardless of this, elastic deformation of the chassis 6 is facilitated.

If the through-holes 39 for screws are provided at positions corresponding to the center portion of the chassis 6, the printed pattern will not be restricted as would be the case if they were made in the form of long holes, and two holes would be provided in the longitudinal direction of the printed circuit board 7. You can also do that.

Figures 5 and 6 show a structure in which the printed circuit board 7 is installed in the chassis 6 without using the spring 36, and when the chassis 6 is pushed into the cylindrical case 1 and stored, the printed circuit board 7 is It has a structure that strengthens the installation force.

That is, in FIG. 5, a plurality of elastic tongues 40 are provided on both end edges of the semi-cylindrical chassis 6, a hook-shaped protrusion 41 is provided at the tip of the tongue 40, and a guide pin 42 is provided protrudingly. When the board 7 is strongly pressed against the chassis 6, the elastic tongues 40 deform outward, and the hook-shaped protrusions 41 embrace and fix the printed board 7.

If the chassis 6 is pushed into the cylindrical case 1 in this state, both end edges of the chassis 6 will contract in the radial direction as shown by broken line arrows B in FIG. 6, and the elastic tongues 40 will also elastically deform inward. ,
The holding force of the hook-shaped projection 41 indicated by the solid arrow C is increased.

If a stronger holding force than both ends of the chassis 6 is required, this can be overcome by providing a protrusion 43 on the outer surface of the elastic tongue piece 40 that projects outward from both ends of the chassis 6.

As described above, according to this invention, the inner wall of the cylindrical case 1 is tapered and inclined from the opening 2 at one end, and the chassis 6 on which the printed circuit board 7 is installed is made semi-cylindrical. By making the chassis 6 a slightly larger diameter than the other end 5 of the cylindrical case 1, when the chassis 6 is pushed into the cylindrical case 1, the chassis 6 contracts in the radial direction and exerts an elastic reaction force, causing the cylindrical It can be easily elastically held and stored in the shaped case 1.

In addition, since it can be easily stored in the cylindrical case 1,
Even if the stored parts generate high voltage, such as a discharge gas lighter, they will not cause a sense of danger to the user, and in the case of a two-part case, it will also prevent water droplets from entering from the mating surfaces, which will prevent the characteristics of the stored parts from deteriorating. There is no invitation.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view of a dry battery type gas lighter implementing this invention, Fig. 2 is a top sectional view, Fig. 3 is an exploded perspective view of a main part of the same embodiment, and Fig. 4 is a main part of the same embodiment. FIG. 5 is an exploded perspective view of a main part of another embodiment, and FIG. 6 is an explanatory view of a main part of the same embodiment. 1...Cylindrical case, 2...One end side, 5
...Other end side, 6...Chassis, 7...
····Printed board.

Claims (1)

[Scope of utility model registration request] The other end side 5 of the cylindrical case 1 with one end side 2 open has a slightly smaller diameter than the one end side 2, the inner wall is tapered, and the chassis 6 is made of elastic synthetic resin. The cylindrical case 1 is formed into a semi-cylindrical shape having a slightly larger diameter than the inner wall shape of the other end side 5, and a printed circuit board 7 with required parts mounted on the chassis 6 is installed.
A component storage structure for a small electric device, in which the chassis 6 is pushed in from the opening side 2 at one end, and the chassis 6 is contracted in the radial direction to be elastically held within the cylindrical case 1.