JP6771242B2 - Plug attachment - Google Patents

Description

The present invention relates to a plug attachment having a plug blade on the main body. In particular, the present invention relates to an attachment in a plug having an outlet that supplies electric power obtained from the plug blade to a load-side electric circuit in the main body.

It is well known that a plug that supplies power to a load-side electric circuit by inserting and connecting a plug blade to an outlet arranged in a construction material or the like. On the other hand, a plug having a function of selectively switching the power supply to the load-side electric circuit inside the plug body is described in, for example, an earth leakage breaker with a plug blade as disclosed in Patent Document 1 and Patent Document 2. Leakage protection plugs as disclosed are known. Further, a plug having a mechanism inside the plug body that can increase or decrease the number of plug blades according to the wiring form of the outlet is a 2P3P combined plug as disclosed in Patent Document 3 (2P is 2 poles, 3P is 2). (It is said to have a polar ground terminal) is known.

The earth leakage breaker with a plug blade of Patent Document 1 electrically connects an outlet and a load device, and when an earth leakage occurs in the load device, it instantly detects the leakage and shuts off the energization of the load device. The earth leakage protection plug of Patent Document 2 is the same as that of Patent Document 1.

Jikkai Sho 63-079043 Japanese Unexamined Patent Publication No. 2002-216613

As described above, in a plug with additional functions that has a function to switch the power supply and a function to increase or decrease the number of blades inside the plug body, it is necessary to store the parts that make up these additional functions. Therefore, the size of the plug body tends to be larger and the weight tends to be heavier than that of the plug not having the above-mentioned function.

In a plug having such an additional function, when the main body is connected to an outlet, it is necessary to firmly connect the plug so as not to cause a connection failure. That is, in the plugs disclosed in Patent Document 1 and Patent Document 2, the surface on which the plug blade is arranged is configured to be in close contact with the outlet to support the size and weight of the main body.

However, in order for the plug body to be more firmly connected to the outlet, it is desired to provide the plug body with an attachment that assists in maintaining the connection to improve the electrical connection reliability.

In view of the above points, it is an object of the present invention to provide an attachment of a plug body capable of maintaining connection reliability even after the plug body is inserted into an outlet and connected.

In the plug structure of the present invention, a base portion having a first width forming a predetermined surface having a plug blade and a second width larger than the first width are connected to the base to load the load. Attached to a plug that has a main body with a stepped portion formed by the difference in width between the outlet to be connected by inserting the plug of the device and the content storage section that houses the leakage detection section that detects the leakage caused by the insulation deterioration of the load device. An attachment that supports the main body of the plug, and has a base portion that abuts on the predetermined surface and an arm portion that extends from both sides of the base portion in a direction opposite to the protruding direction of the plug blade. The main body of the attachment is formed, and the step portion of the main body of the plug between the engaging portion that engages with the main body of the plug at the tip of the arm and the base and the engaging portion of the arm. It is characterized in that a main body support portion for supporting the main body of the plug is provided in contact with the main body.

As a result, the plug body can be supported by both the engaging portion and the body support portion of the attachment, so that the plug body can be firmly supported even after the plug body is inserted into the outlet and connected. Thereby, it is possible to provide an attachment of a plug body capable of maintaining connection reliability.

Further, a support portion of the base portion for supporting the side surface of the base portion in the width direction may be provided between the main body support portion and the base portion of the arm portion.

As a result, the side surface of the base portion of the plug body in the width direction can be supported, so that the connection reliability is further improved.

According to the present invention, connection reliability can be maintained even after the plug body is plugged into an outlet and connected.

It is an external view of the plug which concerns on this embodiment. It is an external view seen from the upper surface of a plug. It is the schematic when the attachment is attached to the plug body. It is a perspective view of an attachment. It is a schematic diagram when the plug body is divided. It is a figure which showed the conventional example. It is a figure which showed the conventional example.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following preferred embodiments are merely exemplary in nature and are not intended to limit the invention, its scope of application or its use.

(Outline of plug)

First, the outline of the plug will be described. The plug 10 according to the present embodiment is a plug used by being plugged and connected to an outlet 200 (referred to as a primary side outlet for distinction) arranged on a construction material or the like. Outlets 31 and 33 (referred to as secondary outlets for distinction) are arranged on the main body of the plug 10, and the load is loaded by inserting a plug of a load device or the like into the outlet of the main body of the plug 10 and connecting the plug 10. Supply power to equipment.

Further, when an electric leakage occurs in the main body of the plug 10 due to insulation deterioration of the load device, electrical wiring, etc., this is detected instantly and the supply of electric power from the primary side outlet 200 to the load device is cut off. It houses an earth leakage detection unit and an earth leakage breaker, and the plug 10 as a whole constitutes a plug-type earth leakage breaker. In particular, the plug 10 is a plug having a total of three plug blades, each of which is connected to the voltage phase and the neutral phase, and a plug blade (called an earth pin) connected to the ground electrode. The outlet 200 on the side is a plug that can be used both when it is a 3-pole outlet having a ground pin insertion hole and when it is a 2-pole outlet without a ground pin insertion hole.

In the following, when the plug 10 is inserted into the primary outlet 200, the surface of the plug 10 facing the front side is referred to as "front surface", and the surface facing the outlet is referred to as "rear surface". Each direction of "up", "down", "left", and "right" is defined based on the state in which the plug 10 is inserted into the outlet.

As shown in FIG. 1, the plug 10 includes a substantially cylindrical plug body 20 having a size (for example, 110 × 50 × 55 mm) that can be grasped by a user (operator) with one hand and fingers. The contents of the earth leakage detection unit, the shutoff mechanism, and the like are housed inside the plug body 20.

The outer shape of the main body of the plug 10 has a substantially cylindrical shape formed by a base portion 20b2 having a plug blade on a predetermined surface and content accommodating portions 20b1 and 20a connected to the base portion 20b2.

The base portion 20b2 is formed to have a width (for example, 30 mm) sufficient to include a plug blade. Further, the content accommodating portion 20b1 connected to the base portion 20b2 is formed to have a width (for example, 50 mm) larger than that of the base portion 20b2.

Due to these differences in width, a step portion 20b3 is formed on the main body 20 of the plug 10. The stepped portion 20b3 allows the hook portion of the fingers to be provided on the main body as an outer shape, and the grip portion of the main body 20 of the plug 10 is formed in combination with the shapes of the contents accommodating portions 20a and 20b having a substantially cylindrical shape. ..

On the other hand, the step portion 20b3 is provided with a finger accommodating portion 20b4 for accommodating the fingers gripping the main body 20 in the protruding direction of the plug blade. The finger storage portion 20b4 is formed by recesses between the left and right side surface portions of the base portion 20b2 and the left and right side surface portions of the content storage portion 20b.

Since the width of the left and right side surfaces of the base portion 20b2 is formed smaller than the width of the content accommodating portion 20 in the left-right direction, when the periphery of the content accommodating portion 20 is grasped by a finger, the recess is formed. Hands and fingers are stored. Fingertips are located on the left and right side surfaces of the base portion 20b2 so that the main body 20 can be firmly gripped and the fingertips are prevented from wrapping around to the rear surface of the base portion 20b2.

Further, on the left and right side surfaces of the plug main body 20, recesses shown by 20b5 formed by notching a part of the content accommodating portion 20b are formed. In the figure, the recess 20b5 on the left side is shown, but the recess 20b5 is also formed on the right side at the same positions in the vertical direction and the front-rear direction.

The plug main body 20 can be separated back and forth at the central portion in the front-rear direction, and FIG. 5 shows a state in which the plug main body 20 is separated back and forth.

The plug body 20 includes a front cover 20a forming the front half and a rear cover 20b forming the rear half. The front cover 20a has a bottomed box shape with an opening on the rear side and the rear cover 20b on the front side. Further, an engaging claw portion 20c is provided at the left end portion of the front cover 20a, and an engaging recess 20d capable of engaging with the engaging claw portion 20c is provided at a position corresponding to the engaging claw portion 20c on the rear cover 20b. Has been done. Then, with both covers 20a and 20b abutting against each other, the engaging claw portion 20c of the front cover 20a and the engaging recess 20d of the rear cover 20b are engaged with each other. As a result, both covers 20a and 20b are integrally assembled to form the plug body 20, and a closed space is formed inside the plug body 20. After the above assembly, the front cover 20a and the rear cover 20b are screwed and fixed at the four corners on the rear surface side of the rear cover 20b by tapping screws (not shown).

Hereinafter, the term “plug body 20” simply refers to the plug body after screwing and fixing. That is, the plug main body 20 after being fixed by screwing has a front wall portion formed of the bottom wall of the front cover 20a, a rear wall portion formed on the rear side of the front wall portion, and a rear wall portion formed of the bottom wall of the rear cover 20b. It is composed of the peripheral walls of both the front cover 20a and the rear cover 20b, and has four side wall portions connecting the front wall portion and the rear wall portion. The side wall portion is composed of upper and lower wall portions and left and right wall portions. The covering wall portion is composed of a front wall portion and four side wall portions.

Although not shown, the earth leakage protection unit 50 includes an earth leakage detection unit that detects an earth leakage and a connection cutoff unit that cuts off the connection between the input and output of the plug when the earth leakage detection unit detects an overcurrent / leakage. .. Conventional techniques can be applied to the configurations of the earth leakage protection unit and the connection cutoff unit, and detailed description thereof will be omitted here.

On the rear wall portion of the plug main body 20, a plug 25 composed of two electrode plugs 29 and 29 and a ground plug 27 is projected at a position near the upper end. Further, a crimp terminal 26 having a function of a ground terminal of the plug 10 is provided at the lower left corner of the same rear wall portion. The plug 10 electrically connects the outlet and the load device by inserting the plug 25 into the outlet and inserting the plug of the load device into the three-pole outlet portions 31 and 31 described later.

On the front wall portion of the plug main body 20, push-type ON buttons 23 and test buttons 24 are arranged in the order described from the top at intermediate positions in the vertical and horizontal directions. The ON button 23 is a switch that turns on (makes a connection state) the supply of commercial power to the load device. The test button 24 is in a state where the supply of commercial power to the load device is turned off in order to confirm whether the plug 10 operates normally (that is, whether the supply of commercial power to the load device is cut off in the event of an electric leakage). It is a switch to set (blocked state).

Further, on the front wall portion of the plug main body 20, one insertion port 31 (corresponding to a 3-pole plug) for inserting a plug of a load device or the like is provided under the test button 24. Although not shown, a similar insertion port is provided in the center of the lower wall portion which is a part of the side wall portion of the plug main body 20. At the lower part of the plug main body 20, a common blade receiving metal fitting 32 into which a power plug of a load device or the like inserted from both insertion ports 31 and a ground plug is fitted is provided.

On the front wall of the plug body 20, the power supply display unit 21 is provided at a position closer to the left end on the upper side of the ON button 23, and the pole number display unit 22 is provided at a position closer to the right end so that they are at the same height. ing.

The power display unit 21 is composed of, for example, an LED, and when it is detected that the power display unit 21 is inserted into an outlet by pressing the ON button 23, that is, electricity can be supplied between the outlet and the load device via the plug 10. Lights up when the condition is reached. As a result, the user who uses the plug 10 can grasp that the commercial power and the load device are normally conducted. On the other hand, the power display unit 21 is turned off when the plug 10 cannot be energized, such as when a cutoff operation is performed by the earth leakage protection unit 50 that has detected an overcurrent or an electric leakage. This allows the user to know that an overcurrent or earth leakage has occurred, or that the test has been performed successfully.

After an overcurrent or an electric leakage occurs, and after the operation check of the plug 10 by the test button 24 is completed, the plug 10 can be used again as an electric leakage detection circuit breaker by pressing the ON button 23 again. Become.

The pole number display unit 22 represents the state of the number of poles of the insertion plug 25, and is a pole number display window 22a formed through the front wall portion of the plug body 20 and a plug on the rear side of the pole number display window 22a. It is composed of a color display unit 46a, which will be described later, arranged in the main body 20. In other words, the pole number display unit 22 is configured so that the display color of the color display unit 46a can be seen through the pole number display window 22a.

On the left side wall portion of the plug main body 20, a circular recess 28a having a peripheral wall portion having an arcuate cross section is formed at a position near the upper end. From the bottom to the front end of the recess 28a, a rectangular button insertion hole 28b is formed so as to penetrate the left wall portion. A push-type release button 41 as an operating means is movably inserted into the button insertion hole 28b. The release button 41 has a rod portion 41c extending in the right direction, and the tip portion (left end portion) of the rod portion 41c protrudes outside the plug body 20 (hereinafter, also referred to as a button reference position) to prevent the release button 41 from coming off the plug body 20. Has been done. The release button 41 is always urged in the protruding direction by a release button spring 42 (see FIG. 2) around the rod portion 41c. That is, the release button 41 is configured to be pushed into the plug main body 20 when an operating force is applied, and to return to the protruding position when the operating force is released.

(attachment)

Next, the attachment will be described. The main body 300 of the attachment has a base 301 on a flat plate that abuts on a predetermined surface on which the plug blade projects from the main body of the plug, and an arm extending from both sides of the base 301 in a direction opposite to the protruding direction of the plug blade. It is provided with a unit 302.

The base 301 and the arm 302 are formed in a flat plate shape with a height along the vertical direction of the plug body, and the height of the arm 302 is about 2 minutes with respect to the height of the base 301. It is formed in 1.

The arm portion 302 includes an engaging portion that engages with a recess 20b5 formed on the side surface of the main body 20 of the plug at its tip portion. The end of the engaging portion is formed in the shape of a key claw, and the return portion is formed in the direction in which the arms are opposed to each other. The return portion makes it easier to engage with the recessed portion of the recess.

Further, a main body support portion 302b is provided between the base portion 301 of the arm portion 302 and the engaging portion 302a to abut on the stepped portion 20b3 of the main body 20 of the plug to support the main body of the plug. The main body support portion 302b is formed in a curved shape along the outer shell of the plug main body having a substantially cylindrical shape, and is formed so as to increase the contact area.

Further, between the main body support portion 302b of the arm portion 302 and the base portion 301, a support portion 302c of the base portion 20b2 that supports the side surface of the base portion 20b2 in the width direction is provided. The support portion 302c of the base portion is formed by projecting ribs in a direction in which the arm portions 302 face each other. Since the arm portion 302 is formed in a flat plate shape, it can be elastically displaced in the direction in which the arm portions 302 face each other, and the engaging portion 302a provided on the arm portion 302 and the main body s current affairs. The plug body 20 can be firmly supported from both side surfaces by the branch switch 302b and the support portion 302c of the base portion.

The base 301 can improve the contact property between the plug main body 20 and the outlet disposed on the construction material or the like, and can maintain the connection reliability even after the plug main body is inserted into the outlet and connected.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to firmly support a main body formed in a substantially cylindrical shape of a plug having an outlet that supplies electric power obtained from a plug blade to a load-side electric circuit. Therefore, the present invention is widely applied and useful not only to a plug-type earth leakage breaker having an earth leakage detection function and an earth leakage function inside, but also to a plug having other functions.

10 Plug 20 Main body 20a Contents storage part 20b Contents storage part 20b2 Base part 20b3 Step part 300 Attachment 301 Base part 302 Arm part 302a Engagement part 302b Main body support part 302c Base part support part

Claims (2)

A base part having a first width forming a predetermined surface with a plug blade and a second width larger than the first width are connected to the base, and a plug of a load device is inserted and connected. The main body of the plug is attached to a plug having a main body having a stepped portion formed by a difference in width between a content accommodating portion containing an electric leakage detection unit that detects an electric leakage caused by deterioration of insulation between an outlet and a load device. It is an attachment that supports
A base that abuts on the predetermined surface and
The main body of the attachment is formed by having an arm portion extending from both sides of the base portion in a direction opposite to the protruding direction of the plug blade, and at the same time.
An engaging portion that engages with the main body of the plug at the tip of the arm
An attachment of a plug, characterized in that a main body support portion that abuts on a stepped portion of the main body of the plug and supports the main body of the plug is provided between the base portion of the arm portion and the engaging portion. In claim 1,
An attachment of a plug, characterized in that a support portion of a base portion for supporting the widthwise side surface of the base portion is provided between the main body support portion and the base portion of the arm portion.

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