JP6692243B2 - Protective device for electrical plug - Google Patents

Description

  The present invention relates to an electric plug for an electric outlet, in which at least a part of the periphery of an electric plug that includes a handle portion that is connected to an electric cord of an electric device and a blade portion that protrudes from the handle portion toward a tip side is provided. Of the present invention relates to a protective device for an electric plug which surrounds an axis of a removal shaft along a removal direction of a blade part of the.

  Patent Document 1 describes a protective device for an electric plug that surrounds at least a part of the periphery of the electric plug. Specifically, Patent Document 1 describes that a bellows-shaped cover made of an insulator such as rubber or vinyl is attached to the root portion of the electric plug. This cover has a structure that covers from the base portion of the electric plug to the handle portion of the electric plug and the blade portion protruding from the handle portion in a state where no external force is applied (Patent Document 1). (Fig. 1). Then, when the blade portion of the electric plug with the cover is inserted into the electric outlet, the bellows-like cover is compressed and contracted between the root portion and the electric outlet (see FIG. 2 of Patent Document 1). ).

Japanese Utility Model Publication No. 62-86083

In the protective device for an electric plug described in Patent Document 1, the cover is always in a compressed state while the blade portion of the electric plug is inserted into the electric outlet. Therefore, if the blade portion of the electric plug remains plugged into the electric outlet for a long period of time, the cover may have a compression tendency, and the compressed state may not be restored. In that case, even if the blade part of the electric plug is removed from the electrical outlet next time, the blade part cannot be covered with the cover that remains compressed due to the compression tendency, and the blade part is protected. Can no longer play the role.
In order to solve such a problem, the elastic force of the cover can be increased so as not to have a compression tendency. However, in doing so, when the blade portion of the electric plug is inserted into the electric outlet, the blade portion of the electric plug may naturally come off from the electric outlet due to the strong elastic force.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a protective device for an electric plug, which can serve to protect the electric plug for a long period of time.

The characteristic configuration of the protective device for an electric plug according to the present invention to achieve the above-mentioned object is a handle portion connected to an electric cord of an electric device and a blade portion protruding from the handle portion toward a tip side. A protective device for an electric plug, which encloses at least a part of the periphery of an electric plug comprising and around an axis of a pull-out shaft along a pulling direction of the blade portion of the electric plug with respect to an electric outlet,
A mounting portion mounted to the electric plug,
Insulation that is connected to the mounting portion and extends from the mounting portion toward the rear end side opposite to the tip end side from which the blade portion protrudes, and is expandable / contractible along the pull-out direction by elastic deformation. The inner elastic part of
It is connected to the inner elastic portion arranged on the inner diameter side at the rear end side and extends from the rear end side to the front end side while surrounding the periphery of the electric plug around the axis of the removable shaft and elastically deforms. By including an insulating outer elastic portion that can be expanded and contracted along the slip-on direction,
The outer elastic portion, the length from the front end side in the state not contracted by external force to the rear end side is formed longer than the protruding length from the handle portion of the blade portion,
When the blade portion of the electric plug is left inserted in the electric outlet, the outer elastic portion surrounds the handle portion around the shaft. It is in the point that is configured.

  According to the above characteristic configuration, when the blade portion of the electric plug is left inserted in the electric outlet, the outer elastic portion is directed toward the front end side with the rear end side being connected to the inner elastic portion. The handle portion is extended around the axis of the slide shaft. In other words, in the plugged-in state, the periphery of the handle part of the electric plug is surrounded by the outer elastic part, so in order to hold the handle part with a contact body such as a finger, the outer elastic part should be attached to the rear end of the electric plug. It is necessary to expose the handle part by contracting it by pushing it from the side toward the tip side. Also, with the electric plug removed from the electrical outlet, if the handle part is held by the contact body, that is, if the rear end side of the outer elastic part is pushed toward the tip side, The length of the elastic part from the front end side to the rear end side when it is not contracted by external force is longer than the protruding length of the blade part from the handle part. Also extends toward the tip side, and the outer elastic portion surrounds all or most of the blade portion. Therefore, if the handle part is held by the contact body when the electric plug is pulled out from the electric outlet, the outer elastic part encloses all or most of the blade part, so that the human body may come into contact with the blade part. It can be prevented.

Further, when the blade portion of the electric plug is left inserted in the electric outlet, the outer elastic portion extends toward the front end side with the rear end side being connected to the inner elastic portion. , The handle part is in a state of being surrounded around the slip-on shaft. That is, in the inserted state, the outer elastic portion surrounds the handle portion around the pull-out shaft in a state where the length in the pull-out direction is equal to or longer than the length of the handle portion. In this way, even if the blade part of the electric plug is inserted into the electric outlet for a long period of time, the outer elastic part is at least longer than the length of the handle part and greatly contracts. It's not. Therefore, even if the outer elastic part has a contraction habit, the length of the handle is kept longer than the length of the handle, so the handle will be held by the contact body when the electric plug is removed from the electrical outlet next time. In this case, all or most of the blade portion can be surrounded by the outer elastic portion, and the human body can be prevented from coming into contact with the blade portion.
Therefore, it is possible to provide a protection device for an electric plug that can protect the electric plug for a long period of time.

  Another characteristic configuration of the protective device for an electric plug according to the present invention is that, in the inserted state, when the outer elastic portion and the inner elastic portion are pushed by a contact body from a rear end side to a front end side, the outer side The elastic portion contracts by being sandwiched between the contact body and the electrical outlet with the rear end side contacting the contact body and the tip side contacting the electric outlet, and the inner elastic portion is When the end side is in contact with the contact body and the tip side is fixed to the electric plug by the mounting portion, the grip portion is sandwiched between the contact body and the mounting portion and contracts, so that the handle portion is the outer side. It is configured such that a region not surrounded by the elastic portion and the inner elastic portion is created.

  According to the above characteristic configuration, when the blade portion of the electric plug is inserted into the electric outlet, the outer elastic portion and the inner elastic portion are contact bodies in order to hold the handle portion with a contact body such as a finger. When pushed from the rear end side toward the front end side, the outer elastic portion is sandwiched between the contact body and the electrical outlet and contracts, and the inner elastic portion is sandwiched between the contact body and the mounting portion. The contraction creates a region in which the handle is not surrounded by the outer elastic part and the inner elastic part. As a result, the handle portion can be held by a contact body such as a finger.

  Still another characteristic configuration of the protective device for an electric plug according to the present invention is that the handle portion of the electric plug in the inserted state is held by the contact body and the blade portion of the electric plug is the electric outlet. In the process of withdrawing from, as the blade portion is withdrawn from the electrical outlet, the outer elastic portion, by expanding the distance between the electrical outlet and the contact body having the handle portion of the electrical plug, The rear end side starts contacting the contact body and the front end side begins to expand while keeping contact with the electric outlet, and finally the rear end side contacts the contact body and the front end side separates from the electric outlet and extends the most. In this state, the outer elastic portion extends beyond the handle portion toward the tip side of the electric plug.

  According to the above characteristic configuration, in the process of holding the handle portion of the electric plug in the inserted state with the contact body and pulling it out of the electric outlet, as the blade portion is pulled out of the electric outlet, the rear end side of the outer elastic portion contacts. It starts to expand while keeping contact with the body and the tip side is in contact with the electric outlet, and finally the rear end side comes into contact with the contact body and the tip side is away from the electric outlet and becomes the most extended state. It is in a state of extending toward the tip side of the handle portion. Therefore, the outer elastic part can always surround all or most of the blade part while the handle part of the electric plug in the inserted state is held by the contact body and after and after it is pulled out from the electrical outlet. It is possible to prevent the human body from coming into contact with the part.

Still another characteristic configuration of a protective device for an electric plug according to the present invention is a structure in which the mounting portion has an elastically deformable plate-shaped member in which a hole portion through which the blade portion of the electric plug is inserted is formed. Has become
When the blade portion of the electric plug is inserted into the hole of the mounting portion, the mounting portion comes into close contact with the electric plug due to the elastic force of the mounting portion, and the mounting portion is attached to the electric plug. In contrast, it is fixed.

  According to the above characteristic configuration, since the protective device is fixed to the electric plug by the elastic force of the mounting portion, the protective device can be easily attached to and detached from the electric plug as compared with the case where the protective device is fixed with an adhesive or the like. It can be carried out.

  Yet another characteristic configuration of the protective device for an electric plug according to the present invention is that the outer elastic portion is formed of a bellows-shaped tubular body that is capable of expanding and contracting in the slipping direction.

  According to the above characteristic configuration, when the outer elastic portion is formed of the bellows-shaped tubular body, it becomes difficult to hold the side surface portion of the tubular body, that is, the bellows-shaped portion with a contact body such as a finger. As a result, when trying to hold the handle part of the electrical outlet with a contact body such as a finger, the outer elastic part and the inner elastic part are pushed by the contact body from the rear end side to the front end side and contracted. The method of having a section will be naturally carried out. Then, when such a holding method is implemented, the handle portion of the electric plug in the inserted state is held by the contact body while pulling it out of the electrical outlet, and at all times, the outer elastic portion always keeps all of the blade portion. Alternatively, most of them can be surrounded, and the human body can be prevented from coming into contact with the blade.

  Yet another characteristic configuration of the protective device for an electric plug according to the present invention is that a weight is provided on the rear end side of the outer elastic portion or the inner elastic portion.

  According to the above characteristic configuration, when the electric plug is inserted from the lower side to the upper side in an outdoor outlet or the like with the insertion port facing downward, the weight of the weight causes the rear end side of the outer elastic portion to move downward. That is, it is urged in a direction that extends away from the electrical outlet. In addition, the rear end side of the inner elastic portion, which is connected to the rear end side of the outer elastic portion, also moves downward due to the weight of the inner elastic portion, that is, in the direction in which it extends away from the electrical outlet. Be energized. That is, both the outer elastic portion and the inner elastic portion are urged in the extending direction. Therefore, there is an advantage that it is difficult for the outer elastic portion and the inner elastic portion to have a compression tendency.

It is a perspective view showing the state where the protection device of a 1st embodiment was attached to the electric plug. It is sectional drawing of the protection apparatus of 1st Embodiment. It is a perspective view of the protection device of 1st Embodiment. It is sectional drawing which shows the state which inserted the electric plug with which the protection device of 1st Embodiment was mounted in the electric outlet. It is sectional drawing which shows the state which contracted the protective device with a finger | toe in the state which inserted the electric plug with which the protective device of 1st Embodiment was mounted in the electrical outlet. It is sectional drawing which shows the state which pulled out the electric plug with which the protective device of 1st Embodiment was mounted | worn from the electric outlet. It is sectional drawing which shows the state which inserted the electric plug with which the protective device of 2nd Embodiment was mounted in the electric outlet. It is a perspective view of the protection device of another embodiment. It is a perspective view of the protection device of another embodiment.

<First Embodiment>
Hereinafter, a protection device 10A (10) for an electric plug according to a first embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing a state in which the protection device 10A is attached to the electric plug 2. FIG. 2 is a sectional view of the protection device 10A. FIG. 3 is a perspective view of the protection device 10A. As shown in the figure, the protection device 10A includes a handle portion 2a connected to an electric cord 3 of an electric device such as a power consumption device or a power supply device (for example, a power generator or a charging / discharging device), and the handle portion 2a. At least a part of the periphery of the electric plug 2 provided with the blade portion 2b protruding toward the tip side is along the direction of insertion and removal of the blade portion 2b of the electric plug 2 with respect to the electric outlet 1 (indicated by a thick arrow in the figure). Further, it is configured so as to be surrounded around the axis of the slip-off shaft X. The protection device 10A includes a mounting portion 11, an inner elastic portion 12, and an outer elastic portion 13.

  The mounting portion 11 is a component mounted on the electric plug 2. The protection device 10 </ b> A is fixed to the electric plug 2 by the mounting portion 11. In the present embodiment, the mounting portion 11 has a structure in which a hole portion 11a through which the blade portion 2b of the electric plug 2 is inserted is formed in an elastically deformable plate-shaped member formed of an insulating resin material or the like. ing. Then, when the blade portion 2b of the electric plug 2 is inserted into the hole 11a of the mounting portion 11, the mounting portion 11 is brought into close contact with the electric plug 2 due to the elastic force of the mounting portion 11, so that the mounting portion 11 is electrically plugged. Fixed to 2. That is, the protection device 10A is fixed to the electric plug 2 at the mounting portion 11.

  The inner elastic portion 12 is connected to the mounting portion 11 and extends from the mounting portion 11 toward the rear end side opposite to the front end side from which the blade portion 2b protrudes, and along the sliding direction due to elastic deformation. It can be expanded and contracted. In the present embodiment, the inner elastic portion 12 is a tubular member made of an insulating resin material or the like. Since the inner elastic portion 12 is connected to the mounting portion 11 at the tip end side, as long as the mounting portion 11 is fixed to the electric plug 2 even if an external force is applied along the removal direction of the protection device 10A. The tip end side of the inner elastic portion 12 is hardly displaced along the insertion / removal direction. That is, the inner elastic portion 12 is elastically deformed with the tip side thereof fixed.

  The outer elastic portion 13 is connected to the inner elastic portion 12 arranged on the inner diameter side on the rear end side, and is directed from the rear end side to the front end side in a state of surrounding the electric plug 2 around the axis of the slip-off shaft X. It is configured so as to extend and contract along the pull-out direction by elastic deformation. In the present embodiment, the outer elastic portion 13 is a tubular member made of an insulating resin material or the like. In addition, the outer elastic portion 13 is formed of a bellows-shaped tubular body that can be expanded and contracted in the sliding direction. In addition, regarding the length of the outer elastic portion 13 along the insertion / removal direction, the length (“Lb” in FIG. 2) from the front end side to the rear end side in a state where the outer elastic portion 13 is not contracted and extended by an external force is the blade portion. The protruding length of 2b from the handle portion 2a (“La” in FIG. 2) is formed longer. However, regarding the length along the pulling direction, “the length of the handle portion 2a” + “the length of the blade portion 2b: La”> “the length of the outer elastic portion 13: Lb”.

  Further, as shown in FIGS. 1 and 2, the blade portion 2b of the electric plug 2 is pulled out from the electric outlet 1, and an external force is applied to the outer elastic portion 13 and the inner elastic portion 12 from a finger or the like. In the state where the handle 2a is not held, the blade 2b is surrounded by the outer elastic portion 13, but the blade 2b is not covered by the outer elastic portion 13 and the inner elastic portion 12 and is exposed. Therefore, when inserting the blade portion 2b of the electric plug 2 into the insertion port of the electric outlet 1, it is possible to easily align the positions while visually observing the both.

Next, the process until the electric plug 2 with the protection device 10A attached is pulled out from the electric outlet 1 will be described.
FIG. 4 is a sectional view showing a state in which the electric plug 2 with the protection device 10A attached is inserted into the electric outlet 1. Thus, when the blade portion 2b of the electric plug 2 is left inserted in the electric outlet 1, the outer elastic portion 13 has the rear end side connected to the inner elastic portion 12 and the front end side. The handle portion 2a is extended toward and surrounds the handle shaft 2a around the axis of the slide-in shaft X. Furthermore, since the outer elastic portion 13 is formed in a bellows shape, it becomes difficult to hold the side surface portion of the tubular body, that is, the bellows-shaped portion with a contact body such as a finger. That is, even if the contact body such as a finger tries to firmly grip the handle portion 2a of the electric plug 2 from the outside of the outer elastic portion 13, the bellows-shaped outer elastic portion 13 is disturbed and cannot be firmly gripped. As a result, when trying to hold the handle portion 2a of the electric plug 2 with a contact body such as a finger, the outer elastic portion 13 and the inner elastic portion 12 are pushed from the rear end side to the front end side by the contact body and contracted. As a result, the technique of holding the handle portion 2a is naturally performed.

  FIG. 5 is a cross-sectional view showing a state in which the protection device 10A is attached to the electrical plug 1 and the protection device 10A is contracted by a finger in a state where the protection device 10A is inserted into the electrical outlet 1. As described above, when the user grasps the handle portion 2a of the electric plug 2 inserted in the electric outlet 1, the outer elastic portion 13 and the inner elastic portion 12 are pushed into the electric outlet 1 by the fingers. It is necessary to contract to expose the handle portion 2a. In order to hold the handle portion 2a surrounded by the outer elastic portion 13 with the finger when the blade portion 2b of the electric plug 2 is inserted into the electric outlet 1, the outer elastic portion 13 and the inner elastic portion 12 are held. When is pushed by the finger from the rear end side to the front end side, the outer elastic portion 13 is sandwiched between the finger and the electric outlet 1 with the rear end side being in contact with the finger and the front end side being in contact with the electric outlet 1. The inner elastic portion 12 contracts between the finger and the mounting portion 11 while the rear end side is in contact with the finger and the front end side is fixed to the electric plug 2 by the mounting portion 11. This creates a region in which the handle portion 2a is not surrounded by the outer elastic portion 13 and the inner elastic portion 12.

  Then, in the process of pulling out the blade portion 2b of the electric plug 2 from the electric outlet 1 by holding the handle portion 2a of the electric plug 2 in the inserted state with a finger, the electric outlet becomes as the blade portion 2b is pulled out from the electric outlet 1. 1 and the finger holding the handle portion 2a of the electric plug 2 are widened, the outer elastic portion 13 is extended while keeping the rear end side in contact with the finger and the front end side in contact with the electric outlet 1. Begin to.

  FIG. 6 is a cross-sectional view showing a state in which the electric plug 2 with the protection device 10A attached is pulled out from the electric outlet 1. As shown in FIG. 6, in the process of pulling out the blade portion 2b of the electric plug 2 from the electric outlet 1, the outer elastic portion 13 extends while keeping the rear end side in contact with the finger and the front end side in contact with the electric outlet 1. Finally, the rear end side comes into contact with the finger and the front end side is separated from the electrical outlet 1 and is in the most extended state. At this time, the inner elastic portion 12 is sandwiched between the contact body and the mounting portion 11 and is in a contracted state. In this way, when the handle portion 2a is held by a finger in a state where the electric plug 2 is pulled out from the electric outlet 1, that is, the rear end side of the outer elastic portion 13 is pushed into the front end side. Then, as described above, the length (“Lb” in FIG. 2) from the front end side to the rear end side of the outer elastic portion 13 in the state where the outer elastic portion 13 is not contracted by the external force is greater than the handle portion 2a of the blade portion 2b. Is formed to be longer than the protruding length (“La” in FIG. 2) of the blade, the outer elastic portion 13 extends toward the tip side of the handle portion 2a, and the outer elastic portion 13 forms the blade portion 2b. All or most of it will be enclosed. Therefore, when the handle portion 2a is held by a finger when the electric plug 2 is pulled out from the electric outlet 1, the outer elastic portion 13 surrounds all or most of the blade portion 2b, so that the blade portion 2b is covered by the human body. Can be prevented. In particular, even if a power supply device such as a power generator or a charging / discharging device is connected to the electric cord 3 of the electric plug 2, the blade portion 2b of the electric plug 2 is very unlikely to cause an electric shock to the human body. Become.

  As described above, when the blade portion 2b of the electric plug 2 is left inserted in the electric outlet 1, the outer elastic portion 13 has the front end in a state where the rear end side is connected to the inner elastic portion 12. The handle portion 2a extends toward the side and surrounds the handle portion 2a around the axis of the slide-in shaft X. That is, the outer elastic portion 13 surrounds the handle portion 2a around the pull-out axis X with the length in the pull-out direction being equal to or longer than the length of the handle portion 2a. Thus, even if the blade portion 2b of the electric plug 2 is inserted into the electric outlet 1 for a long period of time, the outer elastic portion 13 is at least longer than the length of the handle portion 2a during that time. , It is not in a greatly contracted state. Therefore, even if the outer elastic portion 13 has a contraction tendency, since the length equal to or longer than the length of the handle portion 2a is maintained, the handle portion 2a will be removed when the electric plug 2 is pulled out from the electric outlet 1 next time. When it is held by a finger, all or most of the blade portion 2b can be surrounded by the outer elastic portion 13, and the human body can be prevented from coming into contact with the blade portion 2b.

  In particular, when a power supply device such as a power generator or a charging / discharging device is connected to the electric plug 2 through the electric cord 3, the power supply device has an islanding prevention function when the electric plug 2 is pulled out from the electric outlet 1. Even if the output operation of electric power is stopped due to, for example, the electric power may still be slightly output from the power supply device to the blade portion 2b of the electric plug 2 immediately after the electric plug 2 is pulled out from the electric outlet 1. is there. Even in such a case, if the protective device according to the present invention is attached to the electric plug 2, the outer elastic portion 13 surrounds all or most of the blade portion 2b so that the human body comes into contact with the blade portion 2b. It is possible to prevent the electric shock of the human body.

<Second Embodiment>
The protection device 10B (10) of the second embodiment is different from the protection device 10A described in the first embodiment in that a weight 14 is provided on the rear end side of the outer elastic portion 13 or the inner elastic portion 12. .. Hereinafter, the protection device 10B of the second embodiment will be described, but the description of the same configuration as the above embodiment will be omitted.

  FIG. 7: is sectional drawing which shows the state which inserted the electric plug 2 with which the protective device 10B of 2nd Embodiment was mounted in the electric outlet 1. As shown in FIG. The figure shows the case where the electrical outlet 1 is an outdoor outlet provided on an outdoor wall surface of a facility such as a house. The outlet of the electric outlet 1 as the outdoor outlet faces downward in order to avoid intrusion of rain or the like. Therefore, the electric plug 2 is also inserted upward from below.

  As shown in the figure, in the protection device 10B of the present embodiment, a weight 14 is provided on the rear end side of the outer elastic portion 13. Therefore, when the blade portion 2b of the electric plug 2 to which the protection device 10B is attached is inserted into the electric outlet 1, the rear end side of the outer elastic portion 13 is moved downward due to the weight of the weight 14, that is, away from the electric outlet 1. It is urged in the extending direction. In addition, the rear end side of the inner elastic portion 12 connected to the rear end side of the outer elastic portion 13 is also moved downward by the weight of the weight 14, that is, away from the electrical outlet 1. Is urged in the direction of extension. In other words, both the outer elastic portion 13 and the inner elastic portion 12 are urged in the extending direction when the blade portion 2b of the electric plug 2 having the protection device 10B is inserted into the electric outlet 1. Become. Therefore, there is an advantage that the outer elastic portion 13 and the inner elastic portion 12 are less likely to have a compression tendency.

<Another embodiment>
<1>
In the above embodiment, the configuration of the protective device for an electric plug of the present invention has been described with reference to specific examples, but the configuration can be changed as appropriate. For example, the shapes of the inner elastic portion 12 and the outer elastic portion 13 are not limited to the specific examples described in the above embodiment, and can be changed as appropriate.
FIG. 8 is a perspective view of a protection device 10C (10) according to another embodiment. As shown in the figure, in the protection device 10C, the inner elastic portion 12 is composed of an elastically deformable strip-shaped member such as a resin material. Then, the mounting portion 11 and the rear end side of the outer elastic portion 13 are connected by the pair of strip-shaped inner elastic portions 12.

  FIG. 9 is a perspective view of a protection device 10D (10) according to another embodiment. As shown in the figure, in the protection device 10D, the inner elastic portion 12 is composed of an elastically deformable spiral member such as a resin material. Further, the outer elastic portion 13 is also composed of an elastically deformable spiral member such as a resin material. Then, the mounting portion 11 and the tip end side of the inner elastic portion 12 are connected, and the rear end side of the inner elastic portion 12 and the rear end side of the outer elastic portion 13 are connected.

<2>
In the above embodiment, an example in which the blade portion 2b of the electric plug 2 is inserted into the hole 11a of the mounting portion 11 to fix the mounting portion 11 to the electric plug 2 has been described. As long as it can be fixed to the electric plug 2, its mounting form can be appropriately changed.
For example, in the above-described embodiment, an example has been described in which the two blade portions 2b of the electric plug 2 are inserted into and closely adhere to the two hole portions 11a of the mounting portion 11, but the mounting portion 11 has one hole. It is also possible to modify such that the holding portion 2a of the electric plug 2 is fitted into the hole, and both are closely fixed by the elastic force of the mounting portion 11.
Besides, the mounting portion 11 may be mounted on the electric plug 2 with an adhesive (adhesive seal) or the like instead of being brought into close contact with the electric plug 2 by its own elastic force. Further, if the mounting portion 11 is mounted on the electric plug 2 with an adhesive, the mounting portion 11 may be made of a material that is not easily elastically deformed.

<3>
The configurations disclosed in the above-described embodiments (including other embodiments, the same applies hereinafter) can be applied in combination with the configurations disclosed in other embodiments as long as no contradiction occurs, and are also disclosed in this specification. The embodiments are exemplifications, and the embodiments of the present invention are not limited thereto, and can be modified as appropriate without departing from the object of the present invention.

  INDUSTRIAL APPLICABILITY The present invention can be used for a protective device for an electric plug that can serve to protect the electric plug for a long period of time.

1 Electric Outlet 2 Electric Plug 2a Handle 2b Blade 3 Electric Cord 10 Protective Device 11 Mounting 11a Hole 12 Inner Elastic 13 External Elastic 14 Weight

Claims (6)

At least a part of the periphery of an electric plug including a handle portion connected to an electric cord of an electric device and a blade portion protruding from the handle portion toward a tip side, and the blade of the electric plug with respect to an electric outlet. A protective device for an electric plug that surrounds the axis of a slip-on shaft along the slip-on direction of a part,
A mounting portion mounted to the electric plug,
Insulation that is connected to the mounting portion and extends from the mounting portion toward the rear end side opposite to the tip end side from which the blade portion protrudes, and is expandable / contractible along the pull-out direction by elastic deformation. The inner elastic part of
It is connected to the inner elastic portion arranged on the inner diameter side at the rear end side and extends from the rear end side to the front end side while surrounding the periphery of the electric plug around the axis of the removable shaft and elastically deforms. By including an insulating outer elastic portion that can be expanded and contracted along the slip-on direction,
The outer elastic portion, the length from the front end side in the state not contracted by external force to the rear end side is formed longer than the protruding length from the handle portion of the blade portion,
When the blade portion of the electric plug is left inserted in the electric outlet, the outer elastic portion surrounds the handle portion around the shaft. Protective device for the configured electrical plug.   In the inserted state, when the outer elastic portion and the inner elastic portion are pushed by the contact body from the rear end side to the front end side, the outer elastic portion has the rear end side contacting the contact body and the front end side The inner elastic part is contracted by being sandwiched between the contact body and the electric outlet in a state of being in contact with an electric outlet, and the inner elastic part has a rear end side contacting the contact body and a front end side by the mounting part. By being sandwiched between the contact body and the mounting portion and being contracted while being fixed to the plug, an area where the handle portion is not surrounded by the outer elastic portion and the inner elastic portion is created. A protection device for an electric plug according to claim 1, which is configured as follows.   In the process of holding the handle portion of the electric plug in the inserted state with the contact body and pulling out the blade portion of the electric plug from the electrical outlet, as the blade portion is pulled out from the electrical outlet, By expanding the distance between the electrical outlet and the contact body having the handle portion of the electric plug, the outer elastic portion has a rear end side in contact with the contact body and a front end side in contact with the electric outlet. It begins to expand while maintaining the state, and finally the rear end side comes into contact with the contact body and the front end side separates from the electric outlet and becomes the most expanded state, and the outer elastic side is directed toward the front end side of the electric plug. 3. The protective device for an electric plug according to claim 2, wherein the part is configured to be extended more than the handle part. The mounting portion has a structure in which an elastically deformable plate member is formed with a hole through which the blade portion of the electric plug is inserted,
When the blade portion of the electric plug is inserted into the hole of the mounting portion, the mounting portion comes into close contact with the electric plug due to the elastic force of the mounting portion, and the mounting portion is attached to the electric plug. 4. A protection device for an electric plug according to any one of claims 1 to 3, which is fixed to the protection device.   The protective device for an electric plug according to any one of claims 1 to 4, wherein the outer elastic portion is formed of a bellows-shaped tubular body that is capable of expanding and contracting in the pull-out direction.   The protective device for an electric plug according to claim 1, wherein a weight is provided on a rear end side of the outer elastic portion or the inner elastic portion.

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