JPH11288757A - Plug pulling-out preventing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a cord from being pulled out with a simple structure and to reduce the number of manufacturing processes to reduce the cost by forming a plug pullout-preventing cut groove and a tongue piece for engaging a cord integrally with a case for electronic equipment. SOLUTION: A plug pulling-out preventing device 21 is formed of a U-shaped cut groove 21A formed on the plate surface of a case 11 and a tongue piece 21B surrounded by the slit 21A. The tongue piece 21B is protruded to the outside by the thickness portion from the plate surface of the case 11 to engage a cord connected to a plug inserted to a plug insert port 12. Further, cutout parts 21C extended outward are provided on both terminal parts of the cut groove 21A, whereby the cord engaged with the tongue piece 21B is further engaged with the cutout parts 21B by its own elasticity to strengthen the engagement. Inward slits 21D are also provided on the tongue piece 21B, whereby the cord is fitted to the cutout parts 21B, when a tension is given to the cord, and prevented from being slipped out from the tongue piece 21B. In order to prevent the penetration of a foreign matter into the case 11 through the cut groove 21A, a back plate is formed on the reverse side of the cut groove 21A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plug stopper for use in various electronic devices.

[0002]

2. Description of the Related Art Conventionally, in various electronic devices, an adapter is connected to a leading end of a power cord, and a plug 13 is connected to a tip of a cord 14 (FIG. 7) pulled out from the adapter. There are many devices that are supplied with power by being inserted into a plug insertion port 12 provided in the device 11.

When the power receiving structure having this structure is employed, there is a disadvantage that the plug 13 is easily pulled out. In particular, in the field of electronic musical instruments, there is a control box for controlling volume, timbre switching and the like with a foot. 9 and 10 show an example thereof.
A foot-operated pushbutton switch 16 is provided on the upper surface of the flat case 11.
And a petal 17 mounted so as to be capable of seesaw movement. A tone is switched by operating a push button switch 16 and the volume is controlled by causing the petal 17 to perform seesaw movement. It is configured to be able to change the setting state of. Reference numeral 18 shown in FIG. 9 indicates a display for displaying the setting state of the musical instrument and the like.

In such a device operated by the foot, since the device is handled in a rough manner during practical use, an accident that the plug 13 comes off easily occurs. For this reason, a device for preventing the plug 13 from being removed has conventionally been provided. This plug removal device is shown in FIGS.
As shown in the figure, a resin block 15 having a groove 15A formed in the vicinity of the plug insertion port 12 toward the plate surface of the case 11.
Composed of This resin block 15 is a screw 15
B attaches to the case 11 and is used as a plug removal prevention device.

That is, the groove 1 formed in the resin block 15
The power cord 14 is engaged with the plug 5A as shown in FIG. 7 so that even if tension is applied to the cord 14 by the engagement of the cord 14, the tension is not transmitted directly to the plug 13. It is structured to prevent slipping out of the frame 12.

[0006]

Since the plug retaining device shown in FIGS. 6 to 8 is constituted by the resin block 15 molded separately from the case 11, the number of resin molding dies increases. However, there is a disadvantage that the cost increases. Further, since the resin block 15 is mounted on the case 11 by the screws 15B, there is a disadvantage that the assembling is troublesome.

An object of the present invention is to propose a structure of a plug retaining device which can be manufactured at a low cost by reducing the number of molds used.

[0008]

According to the present invention, a U-shaped notch having a groove width larger than the outer diameter of a cord connected to a plug to be retained is formed on a plate surface of a case. The present invention proposes a plug retaining device having a structure in which a tongue piece is formed by forming the tongue piece, and the cord is engaged with the tongue piece to receive the tension applied to the cord by the tongue piece.

According to the structure of the present invention, the plug removal preventing device is constituted by simply forming a U-shaped cut groove on the plate surface of the case, so that it is formed integrally with the case when the case is formed. be able to. As a result, there is no need for a special mold for resin molding in order to constitute the plug retaining device. Further, since there is no need to take extra time for mounting, cost reduction can be expected in these respects.

[0010]

FIG. 1 to FIG. 4 show an embodiment of the present invention. 6 and 7 are denoted by the same reference numerals, and redundant description is omitted, but reference numeral 21 shown in FIGS. 1 to 4 indicates a plug removal device proposed by the present invention.
The plug retaining device 21 according to the present invention includes a U-shaped cut groove 21A formed on the plate surface of the case 11, and a tongue piece 21B formed by being surrounded by the cut groove 21A by forming the cut groove 21A. Can be configured by

When the tongue piece 21B is formed so as to protrude outward from the plate surface of the case 11 by an amount corresponding to the plate thickness, as shown in FIG. 2, the operation for engaging the cord 14 can be easily performed. become. Further, a notch 21C is formed at both ends of the cut groove 21A so as to extend outward. By providing this notch 21C, it is possible to prevent the cord 14 engaged with the tongue piece 21B from engaging with the notch 21C due to the elasticity of the cord 14 itself and coming off the engagement state with the tongue piece 21B. be able to.

Further, the tongue piece 21B is also cut inwardly 21D.
It is also conceivable to form By providing the notch 21D, it is possible to prevent the cord 14 from entering the notch 21D when tension is applied to the cord 14 and causing the cord 14 to come off the tongue piece 21B. A back plate 22 is formed on the back side of the portion where the cut groove 21A is formed, as shown in FIGS. 3 and 4, so that foreign matter is prevented from entering the case 11 from the cut groove 21A portion. be able to.

In the examples shown in FIGS. 1 to 3, the case where the cut groove 21A is formed in an arc shape is shown, but a square U-shaped cut groove may be used as shown in FIG. Even if the square U-shaped cut groove 21A is formed in this manner, the same operation and effect as described above can be obtained.

[0014]

As described above, since the plug retaining device 21 according to the present invention can be formed integrally with the case 11, a mold for forming the plug retaining device is not particularly required. As a result, the cost required for the mold can be reduced. Further, since the plug removal preventing device can be formed integrally with the case 11 at the time of molding the case, no trouble is required particularly for mounting the plug removal preventing device. Therefore, cost reduction can be expected in these respects.

[Brief description of the drawings]

FIG. 1 is a rear view for explaining an embodiment of the present invention.

FIG. 2 is a perspective view for explaining the structure of a main part of the present invention.

FIG. 3 is a sectional view of the present invention taken along the line AA shown in FIG. 1;

FIG. 4 is a sectional view taken along line BB shown in FIG. 1;

FIG. 5 is a rear view for explaining a modified embodiment of the present invention.

FIG. 6 is a rear view for explaining a conventional technique.

FIG. 7 is a perspective view for explaining a conventional technique.

FIG. 8 is a cross-sectional view for explaining a structure of a main part of a conventional technique.

FIG. 9 is a plan view for explaining an example of an apparatus used in a conventional technique.

FIG. 10 is a side view of FIG. 9;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Case 12 Plug insertion port 13 Plug 14 Cord 21 Plug removal prevention device 21A Cut groove 21B Tongue piece 21C, 21D Notch

Claims (2)

[Claims] 1. A. First Embodiment B. A U-shaped cut groove formed by selecting a groove width larger than an outer diameter of a cord connected to a plug to be retained on a plate surface of an electronic device case formed of a resin material. And a tongue formed by being surrounded by the U-shaped incision. 2. The plug retaining device according to claim 1, wherein the tongue is formed to protrude outward from a plate surface of the case having the cut groove.