JP2001086753A - Ac adapter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an AC adapter for preventing coming-off of an AC blade using a simple constitution, after being press fitted. SOLUTION: An AC blade coming-off lock means 5 is provided in one major arm side of a rectangular groove 1 for press fitting an AC blade formed in a coil bobbin 2, this coming-off lock means 5 is formed with an engaging part 7 in a back surface thereof, formed into a hook shape to protrude to the other major arm side of the groove 1 to prevent coming-off in a press fit direction by abutting to an outer end face 8 of the press fitted AC blade 4, and the AC blade coming-off lock means 5 in its upper surface, is fomred with an engaging surface 7a abutting to a lower surface in a side of an inner end part 11 of an upper horizontal memebr 10 formed upward of the AC blade 4 to prevent coming-off in the downward direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an AC adapter for converting AC to DC.

[0002]

2. Description of the Related Art Devices such as small tape recorders used in homes are provided with an AC adapter so that they can be used with an AC commercial power supply.

[0003] This AC adapter is provided with an AC blade for insertion into a power outlet.

In this case, as shown in FIG. 7, the AC blade 4 'is pressed into the AC blade press-fitting groove 1' formed in the thick portion of the flange 17 'of the coil bobbin 2' from the direction of the arrow, as shown in FIG. Installed. FIG. 8 shows a front view after mounting.

[0005]

Conventionally, AC
There is a problem that the blade 4 'is simply press-fitted into the groove 1' and mounted, and since there is no special fixing means, the blade 4 'may come off in the press-fitting direction or fall down.

The present invention has been proposed in view of the above, and has as its object the purpose of press-fitting an AC blade.
An object of the present invention is to provide an AC adapter which has a simple structure and prevents its removal.

[0007]

According to the present invention, an AC blade retaining means 5 is provided on one long side of a substantially rectangular groove 1 formed on a coil bobbin 2 for press-fitting an AC blade. Reference numeral 5 has a hook shape, protrudes from the other long side of the groove 1, and has an engaging portion 7 formed on the rear surface thereof for contacting the outer end surface 8 of the press-fit AC blade 4 to prevent the AC blade 4 from coming off in the press-fitting direction. And the upper part of the engaging portion 7
The above object is achieved by forming an engagement surface 7a which contacts the lower surface of the upper horizontal member 10 formed above the blade 4 on the inner end portion 11 side and prevents the lower surface from falling off.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention is provided with a retaining means 5 for preventing the AC blade press-fitting groove 1 formed on the coil bobbin 2 from coming off in the press-fitting direction and downward when it is press-fitted.

[0009]

FIG. 1 is an exploded perspective view of a main part of the present invention, FIG. 2 is an assembled perspective view of a main part of the present invention, FIG. 3 is a front view of a coil bobbin used in the present invention, and FIG. FIG. 5 is a right side view of a coil bobbin used in the present invention, FIG.
Shows a bottom view.

In FIG. 1, reference numeral 1 denotes an AC blade press-fitting groove formed in the coil bobbin 2. When viewed from the front, the groove 1 has a vertically elongated substantially rectangular shape, and a tapered portion 3 for facilitating press-fitting is formed on the long side on the left side in the illustrated state of the groove 1. Further, a part of the long side of the right side is provided with a substantially hook-shaped stopper means 5 for preventing the inserted AC blade 4 from falling off.

The retaining means 5 is formed from a position slightly above the center to the lower end with respect to the length of one long side corresponding to the right side in the state shown in the drawing and to the other long side on the left side. A tapered portion 6 is formed on the outer surface to facilitate press-fitting of the AC blade 4 into the groove 1. An engaging portion 7 is formed on the rear surface of the engaging member 7 so as to slightly protrude toward the other long side and to come into contact with the outer end surface 8 when the AC blade 4 is press-fitted to prevent the AC blade 4 from coming off.

The hatched portion of the AC blade 4 is pressed into the groove 1.

The AC blade 4 has an elongated plate-shaped AC blade main body 9, and the AC blade main body 9 is provided on both upper sides thereof.
An upper horizontal member 10 which extends substantially orthogonally and in the horizontal direction so as to form a T-shape is integrally formed. The hatched inner end portion 11 of the upper horizontal member 10 is pressed into the groove 1 together with the upper portion of the AC blade body 9. The outer end 12 side of the upper horizontal member 10 projects outside from the groove 1.

A rectangular groove 1 is formed in a lower portion on the tip side of the outer end portion 12.
3 is formed, and a lead wire (not shown) of the coil wound around the coil bobbin 2 is tied through the groove 13. A protruding portion 14 extending in the vertical direction is formed outside the protruding portion.
It is possible to prevent the lead wire that is entangled via the cable from slipping out.

A positioning member 15 is formed at a lower position slightly separated from the upper horizontal member 10 so as to protrude horizontally in a flange shape. This positioning member 15
Is located below the groove 1 of the coil bobbin 2.

FIG. 2 shows a state in which the AC blade 4 is pressed into the groove 1. The coil bobbin 2 is formed by molding an insulating resin, and a thin portion such as the retaining means 5 has flexibility due to its material.

The width of the groove 1 is substantially equal to or slightly smaller than the width of the AC blade 4, so that the AC blade 4 can be pressed into the groove 1. The AC blade 4 is easily press-fitted into the groove 1 by the tapered portions 3 and 6 formed on both sides of the groove 1 and inclined from the outside to the inside at the time of press-fitting. At the time of press-fitting, the retaining means 5 slightly protruding into the groove 1 is pressed by the AC blade 4, and in this case,
Since it has flexibility, it is slightly bent inward, so that the AC blade 4 can be pressed into the groove 1.

After press-fitting, the AC blade 4 located in the groove 1
The outer end surface 8 abuts with the engaging portion 7 on the back surface of the retaining means 5 to reliably prevent the press-fitting direction from coming off.

Further, the AC blade 4 is pulled down in the downward direction.
Since the lower surface 11a on the inner end portion 11 side of the upper horizontal member 10 contacts the upper surface 7a of the engaging portion 7 of the retaining means 5, it can be prevented.

The rattling of the AC blade 4 in the vertical direction is prevented by the lower surface 11a of the upper horizontal member 10 and the positioning member 15 projecting below and positioned below the coil bobbin 2. Can be.

Below the winding drum section 16 of the coil bobbin 2, there is formed a flange 17 extending horizontally and outwardly. The flange 17 is formed with a thick portion, and the thick portion is formed as described above. The groove 1 is formed. On the rear surface of the thick portion, a wall 18 erected vertically below the flange 17 is formed with a groove 19 for guiding a lead line.

FIGS. 3 to 6 show the entirety of the coil bobbin 2. FIG. The flange 17 is formed at one end of the winding drum portion 16, and a pair of grooves 1 for press-fitting an AC blade is formed on both sides of the thick portion 17 a, and a lead wire is guided to the outside on both sides of the groove 1. Lead line guide grooves 19 are formed.

An intermediate flange 20 is formed substantially at the center of the outer periphery of the winding drum 16. The intermediate flange 20 functions as a partition that partitions a primary coil and a secondary coil (not shown) wound on the winding drum section 16. As is well known, a central leg of a core (not shown) is inserted into a hollow portion inside the winding drum portion 16. The upper part of the coil bobbin 2 serves as a mounting part 21 for a rectifying circuit (not shown) in which a rectifying diode and a smoothing capacitor are mounted on a printed circuit board. Reference numeral 22 denotes a protrusion having a tapered portion 22a for guiding a printed circuit board (not shown), and reference numeral 23 denotes a groove for locking the printed circuit board inserted through the tapered portion 22a.

Since these are not directly related to the gist of the present invention, detailed description will be omitted.

The coil is wound around the lead wire guide groove 1
9 is connected to the press-fitted AC blade 4, and the assembly incorporating the core and the rectifier circuit is housed in a case (not shown) as is well known. An AC adapter is configured. An AC blade main body 9 is protruded from the case to the outside, and is inserted into a power outlet (not shown) at the time of use, as is well known. DC output cord (not shown) in the rectifier circuit
Is connected, and a DC output can be supplied to the electronic device via the cord extending from the case to the outside.

[0026]

As described above, according to the present invention, the AC blade press-fitting groove 1 is provided with the retaining means 5 for preventing the AC blade 4 from coming off in the AC blade press-fitting direction and in the downward direction. The blade 4 can be securely mounted.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a main part of the present invention.

FIG. 2 is a perspective view of a main part of the present invention in an assembled state.

FIG. 3 shows a front view of a coil bobbin according to one embodiment of the present invention.

FIG. 4 is a sectional view taken along line AA in FIG.

FIG. 5 shows a side view of the same coil bobbin of the present invention.

FIG. 6 shows a bottom view of the same.

FIG. 7 shows a side view of a conventional example.

FIG. 8 shows a front view of a conventional example.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 groove 2 coil bobbin 3 tapered portion 4 AC blade 5 retaining means 6 tapered portion 7 engaging portion 7a engaging surface 8 AC blade outer end surface 9 AC blade body 10 upper horizontal member 11 inner end portion 12 outer end portion 13 groove 14 protrusion Part 15 Positioning member 16 Winding part 17 Flange 17a Thick part 18 Wall 19 Lead wire guide groove 20 Intermediate flange 21 Rectifier circuit mounting part 22 Projection 23 Printed circuit board locking groove

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yuji Haga 5-5-30 Chiyoda, Sakado-shi, Saitama Pref. Inside the Saitama Plant of Tamura Corporation (72) Inventor Toshihiko Jiroshiro 5-5-30 Chiyoda, Sakado-shi, Saitama No. F-term (reference) at Tamura Seisakusho Saitama Plant 5E043 EB06 5E087 EE10 FF02 GG06 HH01 JJ05 PP08 QQ03 RR25 RR49 5H006 CC01 HA08 HA09

Claims (1)

[Claims] 1. An AC blade retaining means (5) is provided on one long side of a substantially rectangular groove (1) for press-fitting an AC blade formed in a coil bobbin (2). ) Has a hook shape, protrudes from the other long side of the groove (1), and abuts against the outer end surface (8) of the press-fitted AC blade (4) on the back surface thereof to prevent slipping in the press-fitting direction. A joining portion (7) is formed, and the upper portion of the engaging portion (7) is in contact with the lower surface of the upper horizontal member (10) formed above the AC blade (4) on the inner end (11) side. An AC adapter characterized by being formed with an engagement surface (7a) that is in contact with and prevents a downward drop.