JP2009259552A - Fall-off prevention tool of plug - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a plug-fall-off prevention tool capable of preventing a plug from falling off a linear receptacle, in a simple work. <P>SOLUTION: The plug-fall-off prevention tool 1 is formed by providing a pair of engagement parts 2, 2 each equipped with engagement pawls to be engaged with a surface plate 12 of a linear receptacle 10 in passing at least one of the plurality of linear grooves 11 of the surface plate 12, contact parts 4, 4 formed of a flexible member for contacting the pair of engagement parts 2, 2, and a pressing part 5 integrally formed with the contact parts 4, 4 for pressing a plug 20 onto the surface plate 12 when the pair of engagement parts 2, 2 get engaged with the surface plate 12 taking a given position against the plug 20. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a plug removal prevention tool that prevents a plug from being removed from a so-called linear outlet.

  2. Description of the Related Art Conventionally, a structure using an outlet connected to the power source side and a plug connected to the electric device side is widely used as a power feeding structure for connecting a power source and an electric device using the power source. This structure basically consists of an outlet having a plurality of blade receptacles connected to a power source (in many cases, two corresponding to two electrodes, or three with grounding added thereto) and an electric device. And a plug having plug blades that are respectively received by the blade receiving portions.

  Moreover, what is called a linear outlet is also well-known as one of the outlets which comprise the above electric power feeding structures (for example, refer nonpatent literature 1). Hereinafter, the linear outlet will be described with reference to FIG. 8 showing a perspective shape and FIG. 9 showing a cross-sectional shape of a portion along the line AA. The linear outlet 10 has a front plate 12 having a plurality of linear grooves 11 parallel to each other, and blade receiving portions 13 respectively disposed along the linear grooves 11 on the back side of the front plate 12. is there. In this example, two of the three blade receiving portions 13 are connected to the power source via an electric wire (not shown), and the central one is connected to the ground. The front plate 12 may be formed from a single member, or may be formed by combining a plurality of members. The blade receiving portion 13 is formed of an elastic plate member, and elastically holds a plug blade of a later-described plug inserted therethrough.

  On the other hand, as shown in FIG. 10, the plug 20 connected to the linear outlet 10 is connected to a main body 22 to which three covered electric wires 21 are connected and one of the three electric wires 21 as an example. Three plug blades 23 and a handle portion 24 are provided.

  The plug 20 is connected to the linear outlet 10 as shown in FIG. That is, the plug 20 is combined with the outlet 20 so that the three plug blades 23 enter the linear grooves 11 and the bottom surface 22a of the plug body is in contact with the front plate 12. Then, the plug blades 23 that have passed through the linear grooves 11 are respectively received and clamped by the blade receiving portions 13 of the outlets 20. In this state, since the blade receiving portion 13, the plug blade 23, and the electric wire 21 are electrically connected to a power source (not shown), it is possible to supply power to the electrical equipment connected to the electric wire 21.

When using a linear outlet as described above, the plug blade of the plug can be received anywhere on the blade receiving portion extending along the linear groove, so the plug connection position with respect to the outlet can be changed arbitrarily. Can do. Since there is such an advantage, the linear outlet is preferably used for, for example, power supply for a lighting device under a shelf for illuminating a product on a display shelf of a store.
“Explanation of Technical Standards for Electrical Appliances” edited by Electric Power Technology Division, Public Works Division, Agency for Natural Resources and Energy, Ministry of International Trade and Industry 9th edition July 25, 1998 p. 265

  By the way, when the linear outlet having the above-described structure is used, the plug blade can be moved in the blade receiving portion, so that the problem that the plug is easily detached is recognized. When the plug is completely removed from the linear outlet (more specifically, the plug blade of the plug is removed from the blade receptacle of the linear outlet), the power supply to the electric device is naturally cut off. Further, even if the plug does not completely come out of the linear outlet, if a part of the plug is removed as shown in FIGS. 11 and 12, the gap formed between the linear outlet 10 and the plug 20 Foreign matter may get into the. In this case, if the foreign material is made of metal, it may contact the plug blade 23 and the blade receiving portion 13 (see FIG. 9) to cause a short circuit, resulting in a burnout accident.

  To prevent such a problem, if a plug is connected to a linear outlet, the plug may be tied and fixed with a vinyl wire or the like. However, when doing so, troublesome work is required, and when changing the connection position of the plug, a very troublesome work of releasing and fixing the wire is necessary.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a plug removal prevention tool that can prevent a plug from being removed from a linear outlet by a simple operation.

The plug prevention device according to the present invention is
A linear outlet as described above, that is, a front plate having a plurality of linear grooves parallel to each other, and an outlet having a blade receiving portion disposed along the linear groove on the back side of the front plate,
In the power feeding structure comprising plug blades that are respectively received by the blade receiving portions through the linear grooves and comprising plugs connected to the outlets,
A plug prevention tool for preventing a plug connected to the outlet from coming out of the outlet,
A pair of engaging portions each having an engaging claw that passes through at least one of the plurality of linear grooves of the front plate and engages with the front plate;
A communication part for communicating the pair of engagement parts;
A pressing portion that is formed integrally with the connecting portion and that presses the plug against the front plate when the pair of engaging portions are engaged with the front plate by taking a predetermined position with respect to the plug; It has.

  In addition, it is desirable that the connecting portion is formed of a bendable member made of, for example, a soft synthetic resin.

  The communication portions are arranged in a pair so as to be located on both outer sides of the plug connected to the outlet in a state where the pair of engaging portions are engaged with the front plate, and the pressing portion It is preferable that the part is formed so that one end and the other end are coupled to the pair of connecting parts, and the plug is pressed at a portion between the ends.

  In addition, the length of the connecting portion makes it impossible for both engaging claws of the pair of engaging portions to engage with the front plate when the plug is not completely connected to the outlet. It is desirable to be a value.

  On the other hand, it is particularly desirable that the engaging claw has a cross-sectional arrow shape that passes through a portion close to the linear groove of the front plate while being elastically deformed and is hooked on the portion after passing.

  As described above, the plug disconnection preventing device according to the present invention includes a pair of engaging claws that pass through at least one of the plurality of linear grooves on the front plate of the outlet and engage with the front plate. Formed of a bendable member, and a communication part that communicates with the pair of engagement parts, and is formed integrally with the communication part, and the pair of engagement parts is connected to the plug. And a pressing portion that presses the plug against the front plate when engaged with the front plate when the predetermined position is taken. The plug can be pressed and held against the outlet plate by a simple operation of simply engaging the plate. Thereby, it is possible to reliably prevent the plug from being disconnected from the outlet.

  Further, in the plug removal prevention device according to the present invention, particularly when the length of the connecting portion is such that the plug is not completely connected to the outlet, both engaging claws of the pair of engaging portions are connected to the front plate. If it is set to a value that makes it impossible to engage, the operator will notice that the plug is not properly connected to the outlet because the engaging pawl cannot engage the front plate. Become. Therefore, in this case, it is possible to prevent the plug from being held and fixed by the prevention tool while it is in an illegal position.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows a plug removal prevention device 1 according to an embodiment of the present invention. As shown in the figure, the plug removal prevention tool 1 includes a pair of engaging portions 2 and 2, engaging claws 3 and 3 provided in each of the engaging portions 2 and 2, and a pair of engaging portions. 2 and 2 which are connected to each other at the left and right ends, and a pressing portion 5 formed so that one end is connected to one of the connecting portions 4 and 4 and the other end is connected to the other. It is.

  Most of the engaging portion 2 is formed in a flat plate shape, and an engaging claw 3 projects from one surface thereof. The engaging claw 3 is a long and narrow cross-section having a substantially arrow shape, and the longitudinal direction of the engaging claw 3 is arranged to coincide with the direction in which the connecting portion 4 extends.

  Each of the above elements 2 to 5 is made by integrally molding a soft synthetic resin as an example. This soft synthetic resin has a certain degree of elasticity in the state after molding, and therefore the connecting portion 4 can be bent by an external force.

  Hereinafter, the operation of the plug removal preventing device 1 of the present embodiment having the above-described configuration will be described. This disconnection prevention tool 1 is used in a power feeding structure including a linear outlet 10 and a plug 20 shown in FIGS. Since the linear outlet 10 and the plug 20 are basically the same as those described above with reference to FIGS. 8 to 10, detailed description thereof will be omitted unless particularly necessary.

  For example, a plug 20 connected to an electric device (not shown) such as a fluorescent lamp for display shelf illumination via a covered electric wire 21 is connected to a linear outlet 10 as shown in FIG. Accordingly, the three blade receiving portions 13 (see FIG. 9) of the linear outlet 10 are received by the three plug blades 23 (see FIG. 10) of the plug 20, and both of them can be electrically connected. . At this time, the plug 20 can be disposed at any position on the linear groove 11 of the linear outlet 10 as described above.

  After the plug 20 is thus connected to the linear outlet 10, one engaging portion 2 of the plug removal prevention tool 1 is engaged and fixed to the front plate 12 of the linear outlet 10 as shown in FIG. . This engagement is performed by inserting the engaging claw 3 protruding from the engaging portion 2 into the linear groove 11 of the linear outlet 10 (in this case, the middle one of the three). That is, the maximum width of the engaging claw 3 whose cross-sectional shape is an arrow shape, that is, the distance between the tips of the left and right projecting portions is set slightly larger than the width of the linear groove 11. When the claw 3 is pushed into the linear groove 11 with a certain strong force, the protruding portion of the engaging claw 3 passes through the linear groove 11 while elastically deforming the portion of the front plate 12 close to the linear groove 11. And the engaging claw 3 after passing the linear groove | channel 11 is hooked in the part near the linear groove | channel 11 of the surface board 12 which returned to the original state. In this way, one engagement portion 2 is engaged and fixed to the front plate 12.

  Thereafter, the plug removal prevention tool 1 is bent in the direction of arrow B in FIG. 2 so that the other engagement portion 2 approaches the linear outlet 10. The other engaging portion 2 is also engaged and fixed to the front plate 12 in the same manner as described above. At this time, the two connecting portions 4, 4 are bent and are respectively located on the outer sides of the plug 20. 3 and 4 show this state. In this state, the pressing portion 5 of the removal preventing tool 1 presses the plug 20 against the front plate 12. Thus, since the plug 20 is pressed onto the front plate 12 by the removal prevention tool 1, it does not easily come out of the linear outlet 10.

  The length of the connecting portion 4 is set to a minimum value within a range in which the pressing portion 5 is positioned on the plug 20 that is normally connected to the linear outlet 10. Therefore, if the plug 20 is in a state of being slightly lifted on the linear outlet 10, it is impossible for both the engaging portions 2 and 2 to engage with the front plate 12. Therefore, an operator who attaches the removal prevention tool 1 is improper when the plug 20 is improper when the engagement portion 2 of the two engagement portions 2, 2 to be engaged later cannot be engaged with the front plate 12. It is noticed that it is in a proper posture, and it can be properly restored to a normal connection state.

  If the plug 20 is pressed against the surface plate 12 of the linear outlet 10 as described above, there will naturally be no gap between the plug 20 and the linear outlet 10, and foreign matter will enter the gap. It is possible to prevent problems such as a short circuit. Further, the removal preventing tool 1 that holds down the plug 20 is firmly fixed to the linear outlet 10 by the action of the two engaging claws 3, so that the plug 20 moves in a direction along the linear groove 11. This is also prevented.

  In addition, even when there is a slight gap between the plug 20 and the linear outlet 10, as shown in FIG. 4, the front and rear of the gap (the left side and the right side in the figure) are thick engaging portions. Therefore, the foreign matter can be prevented from entering before and after the gap.

  In the embodiment described above, only one engagement claw 3 is provided in one engagement portion 2, but two engagement claws 3 are provided in one engagement portion 2 as shown in FIG. , Engage them with the two linear grooves 11, or provide three engaging claws 3 in one engaging portion 2 as shown in FIG. It is also possible to engage them. In order to make the engagement between the engagement portion 2 and the front plate 12 more reliable, it is preferable to provide more engagement claws 3.

  Moreover, as shown in FIG. 7, you may make it provide the part 2a which rose from the upper surface of the engaging part 2, and put them together through the covered electric wire 21 there. In that case, if this portion 2a is made into a complete box shape, a troublesome operation of passing the covered electric wire 21 through the inside is required in advance, so that the notched portion 2b is not shown as shown in the figure. It is preferable that the covered electric wire 21 is pushed in from there. Further, as shown in the figure, a notch portion 2c is also provided in a part of the engaging portion 2 so that the engaging portion 2 is easily deformed when the engaging claw 3 is engaged with the front plate 12. Thus, this engagement work can be performed more easily.

  Furthermore, the plug removal prevention device according to the present invention may be formed in a shape as shown in FIG. 3 or FIG. 4 by using a hard material. However, as in the above-described embodiment, the connecting portion that can be bent by forming it from a soft material can be used in common for plugs that are somewhat different in size, and the entire preventive device is generally formed into a single sheet. Since it is possible, the effect that the space required for storage and transportation can be reduced is more desirable.

The perspective view which shows one Embodiment of the removal prevention tool of the plug by this invention. The figure explaining the mode of the operation | work which attaches the plug removal prevention tool of FIG. The figure explaining the mode of the operation | work which attaches the plug removal prevention tool of FIG. The side view which shows the plug holding state by the plug removal prevention tool of FIG. The fragmentary sectional view which shows another embodiment of the removal prevention tool of the plug by this invention The fragmentary sectional view which shows another embodiment of the removal prevention tool of the plug by this invention The fragmentary sectional view which shows another embodiment of the removal prevention tool of the plug by this invention Perspective view showing wire outlet and plug Partial sectional view showing the main part of the wire outlet Perspective view showing plug for wire outlet Side view showing an example of the plug disconnected state Side view showing another example of the plug disconnected state

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Plug removal prevention tool 2 Engagement part 3 Engagement claw 4 Connection part 5 Pressing part
10 outlet
11 Linear groove
12 Outlet cover
13 Blade holder
20 plug
23 Blade

Claims (6)

A front plate having a plurality of linear grooves parallel to each other, and an outlet having a blade receiving portion disposed along the linear groove on the back side of the front plate,
In the power feeding structure comprising plug blades that are respectively received by the blade receiving portions through the linear grooves and comprising plugs connected to the outlets,
A plug prevention tool for preventing a plug connected to the outlet from coming out of the outlet,
A pair of engaging portions each having an engaging claw that passes through at least one of the plurality of linear grooves of the front plate and engages with the front plate;
A communication part for communicating the pair of engagement parts;
A pressing portion that is formed integrally with the connecting portion and that presses the plug against the front plate when the pair of engaging portions are engaged with the front plate by taking a predetermined position with respect to the plug; The plug removal prevention tool which has.   The plug disconnection prevention tool according to claim 1, wherein the connecting portion is formed of a bendable member.   3. The plug removal prevention device according to claim 2, wherein the bendable member is made of a soft synthetic resin. A pair of the connecting portions are disposed so as to be located on both outer sides of the plug connected to the outlet, with the pair of engaging portions engaged with the front plate,
4. The pressing portion according to claim 1, wherein one end and the other end are coupled to the pair of connecting portions, respectively, and the plug is pressed at a portion between the end portions. Item 1. A plug prevention tool according to item 1.   The length of the connecting portion is a value that makes it impossible for both engaging claws of the pair of engaging portions to engage with the front plate when the plug is not completely connected to the outlet. The plug removal prevention tool according to any one of claims 1 to 4, wherein the plug removal prevention tool is provided.   6. The cross-sectional arrow according to claim 1, wherein the engaging claw has a cross-sectional arrow shape that passes while elastically deforming a portion near the linear groove of the front plate and is hooked on the portion after passing. The plug removal prevention tool according to claim 1.

Images