JP2006216334A - Plug for electric wire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To supply a plug for electric wires with freely detachable grounding rod that can be used either with the grounding rod attached or detached, enabling the grounding rod to move without a knob attached, and capable of easily detaching the grounding rod with a simple finger-tip operation. <P>SOLUTION: The plug for electric wires equipped with an insertion part 8 for the grounding rod to be inserted into in a case 1 and capable of mounting the grounding rod 3 in free detachment has an elastic member 15 existing in the insertion part 8 for biasing the grounding rod in a pushing-out direction from the insertion part 8. It is also provided with a locking structure each fitted at the grounding rod and the insertion part for regulating the grounding rod 3 from coming out of the insertion part by reactive force of the elastic member when the inserted grounding rod 3 is made rotated by a given angle with an axis line as a center. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electric wire plug mainly used for electrical work or the like.

There is a plug device in which a single device can be used as both a double plug and a single plug (see, for example, Patent Document 1).
JP-A-9-204966

  It is an object of the present invention to provide an electric wire plug that can be used with a grounding rod, and that can be used even when the grounding rod is removed.

  Patent Document 1 is a plug device in which a single plug can be used as both a double plug and a single plug, and does not use a plug having a ground bar and a plug not having a ground as in the present invention. However, it is common in technical content.

The plug device of Patent Document 1 includes a three-pole plug and a two-pole plug. When the two-pole plug is not necessary, the two-pole plug is inserted into the case.

  The configuration for inserting and removing the two-pole plug of Patent Document 1 includes a plug movable mechanism for moving the plug, and this plug movable mechanism has a knob portion for operating from the outside of the case. To insert and remove the 2-pole plug. Therefore, since the device of the knob portion must be provided in the case, the structure becomes complicated and the manufacturing cost increases. Also, it takes time and effort to move the plug with the knob when inserting and removing the plug.

  As a device other than the plug device disclosed in Patent Document 1, there is a device in which a grounding rod is coupled to a case with a screw to be removable. Although the structure is simple, the grounding rod is formed thin, and when the screw is tightened tightly, the finger slides when removed with the finger, so it cannot be easily removed. It must be rotated with a grounding pin sandwiched between hand tools such as pliers. Therefore, an object of the present invention is to enable the movement of the grounding rod without providing a knob portion, and to easily attach and detach the grounding rod with a very simple operation of a fingertip.

  Claim 1 of the present invention is an electric wire plug having an insertion portion for inserting a grounding rod in the case and capable of detachably mounting the grounding rod, wherein the grounding rod is inserted into the insertion portion. In some cases, there is an elastic member in the insertion portion that urges the ground rod in the direction of pushing out the insertion portion, and when the inserted ground rod is rotated by a predetermined angle about the axis, the elastic member Locking structure for restricting the ground bar from coming out of the insertion part due to the reaction force is provided in the ground bar and the insertion part, and the latching structure cooperates to restrict the ground bar from coming out It is.

According to a second aspect of the present invention, the locking structure provided on the grounding rod is a protruding portion of the grounding rod formed so as to protrude outward from the outer peripheral surface of the grounding rod, and the engagement member provided in the insertion portion. The stop structure is a through hole formed by providing a protrusion on the inner surface of the insertion part, and the through hole passes with the protrusion of the ground bar only when the ground bar is inserted into the through hole at a fixed position. A projecting portion that is formed into a shape that is possible, and that forms the projecting portion of the grounding rod and the through-hole by rotating the grounding rod about its axis after the projecting portion of the grounding rod has completely passed through the through-hole. And an element that restricts the ground bar from being pulled out by the urging force of the elastic member is added to claim 1.

According to a third aspect of the present invention, a grounding rod is integrally provided with a locking barrel portion whose outer periphery is formed in an oval shape, and at least both end portions of the oval shape of the locking barrel portion protrude beyond the outer circumferential surface of the grounding rod. An oval through hole that is larger than the locking body is formed in the insertion portion, and after the projecting portion of the ground bar has passed through the through hole, the ground bar is rotated around its axis. In some cases, an element in which the protruding portion of the ground bar overlaps with the protruding portion forming the through hole is added to the second aspect.

According to a fourth aspect of the present invention, when the grounding rod is rotated about its axis after the projecting portion of the grounding rod has passed through the through hole, the grounding rod does not rotate further after rotating a predetermined rotation angle. The element in which the means for restricting is provided in the insertion portion is added to the third aspect.

According to a fifth aspect of the present invention, there is provided a protruding portion on the inner surface that is deeper than the through hole of the insertion portion, and when the locking barrel rotates a predetermined rotation angle, the locking barrel is a protruding portion at the back. The element in which the protrusion part of the back is provided in the position which hits is the structure added to Claim 4.

According to a sixth aspect of the present invention, an element in which means for restricting the rotation of the ground bar in the direction opposite to the predetermined rotation direction is provided in the insertion portion is added to the fourth or fifth aspect.

According to a seventh aspect of the present invention, when the second inner protrusion is provided on the inner surface deeper than the insertion port of the insertion portion, and the locking barrel portion is about to rotate in the direction opposite to the predetermined rotation direction, An element in which the second back protrusion is provided at a position where the stop body abuts against the second back protrusion is added to claim 6.

According to the eighth aspect of the present invention, an element provided with means for preventing further intrusion of the ground bar after the projecting portion of the ground bar has passed through the through hole is added to the second to seventh aspects. is there.

According to a ninth aspect of the present invention, a circular bulging portion is formed at a distance closer to the front end than the locking body portion of the ground rod, and the ground rod is further in contact with the protruding portion forming the through hole. An element for restricting entry into the insertion portion is added to claim 8.

Claim 1 is an electric wire plug that has an insertion portion for inserting a ground rod in the case and can be detachably attached to the ground rod, and when the ground rod is inserted into the insertion portion, There is an elastic member in the insertion portion that urges the ground rod in the direction of pushing out the insertion portion, and the reaction force of the elastic member when the inserted ground rod is rotated by a predetermined angle about its axis. The grounding rod and the insertion portion are provided with a locking structure for restricting the grounding rod from coming out of the insertion portion, and the latching structure cooperates to restrict the grounding rod from coming out. . Therefore, when attaching the grounding rod to the case, the grounding rod is inserted into the insertion portion against the elastic member in the insertion portion, and then the grounding rod is rotated by a predetermined angle about its axis. As a result, a locking action for restricting the ground bar from being pulled out of the insertion portion by the reaction force of the elastic member works, so that the ground rod is mounted without being pulled out of the insertion portion. Thereby, it can be used as a plug having a grounding rod. The structure is simple because there is no knob for moving the grounding rod. The cost can be reduced accordingly. Since the slipping out can be restricted by simply rotating the inserted ground rod by a predetermined angle, the operation for locking the ground rod in the insertion portion is simple and easy to handle. Since the ground bar is automatically pushed out by the elastic member when the lock is released, the ground bar can be easily removed.

According to a second aspect of the present invention, the locking structure provided on the grounding rod is a protruding portion of the grounding rod formed so as to protrude outward from the outer peripheral surface of the grounding rod, and the engagement member provided in the insertion portion. The stop structure is a through hole formed by providing a protrusion on the inner surface of the insertion part, and the through hole passes with the protrusion of the ground bar only when the ground bar is inserted into the through hole at a fixed position. A projecting portion that is formed into a shape that is possible, and that forms the projecting portion of the grounding rod and the through-hole by rotating the grounding rod about its axis after the projecting portion of the grounding rod has completely passed through the through-hole. And the ground bar is prevented from being pulled out by the biasing force of the elastic member. Accordingly, the locking structures provided on the grounding rod and the insertion part are simple in structure because they only provide the protrusions. Manufacturing is easy and costs can be reduced. Moreover, what is necessary is just to perform operation contrary to the time of locking, when unlocking a grounding rod. That is, the ground bar is rotated in the reverse direction around the axis. Even if the rotation is not stopped halfway, when the grounding bar locking structure reaches a position that passes through the through hole, the grounding bar locking structure automatically passes through the through hole by the reaction force of the elastic member. The ground can be removed.

According to a third aspect of the present invention, a grounding rod is integrally provided with a locking barrel portion whose outer periphery is formed in an oval shape, and at least both end portions of the oval shape of the locking barrel portion protrude beyond the outer circumferential surface of the grounding rod. An oval through hole that is larger than the locking body is formed in the insertion portion, and after the projecting portion of the ground bar has passed through the through hole, the ground bar is rotated around its axis. Sometimes, the projecting portion of the ground bar overlaps with the projecting portion forming the through hole. An oval shaped locking body may be formed as the locking structure of the ground bar, and the manufacturing of the locking structure is easy and the cost can be reduced. Moreover, since it is an oval shape, there is no possibility of hurting the hand when holding the grounding rod. The locking structure of the insertion portion is an oval through hole, which is easy to manufacture and can reduce costs. Since the ground bar is locked at least at both ends of the oval shape, the lock is stable.

According to a fourth aspect of the present invention, when the grounding rod is rotated about its axis after the projecting portion of the grounding rod has passed through the through hole, the grounding rod does not rotate further after rotating a predetermined rotation angle. It is the structure by which the means to regulate is provided in the insertion part. Therefore, since the rotation is automatically stopped, it can be used without wondering how much the user rotates the grounding rod. Moreover, if it is rotated too much, it takes time and effort since it must be reversed at a large angle when unlocking. If it can be stopped naturally at a predetermined rotation angle, the angle of reversal can be small and no labor is required.

According to a fifth aspect of the present invention, there is provided a protruding portion on the inner surface that is deeper than the through hole of the insertion portion, and when the locking barrel rotates a predetermined rotation angle, the locking barrel is a protruding portion at the back. It is the structure by which the protrusion part of the back is provided in the position which hits. The means for restricting the rotation angle of the locking body is a protrusion provided on the inner surface behind the through hole, and the configuration is simple, and the cost can be reduced.

According to a sixth aspect of the present invention, means for restricting the ground bar from rotating in a direction opposite to the predetermined rotation direction is provided in the insertion portion. Means are provided for restricting the rotation of the ground bar when it is rotated by a predetermined rotation angle. However, when the grounding rod is inserted, there is a risk that it will rotate in the opposite direction without rotating in the direction to rotate. At this time, the locked state is entered, but when returning to the original state, it is troubled as to which direction the ground bar can be rotated. Therefore, if the inserted ground bar rotates only in a certain direction and does not rotate to the opposite side, there is no problem when returning it to its original position.

According to a seventh aspect of the present invention, when the second inner protrusion is provided on the inner surface deeper than the insertion port of the insertion portion, and the locking barrel portion is about to rotate in the direction opposite to the predetermined rotation direction, It is the structure by which the 2nd back protrusion part is provided in the position where a stop drum part contacts the 2nd back protrusion part. Therefore, the means for restricting the rotation in the reverse direction is the second rear protrusion, which is easy to manufacture and can reduce the cost.

According to the eighth aspect of the present invention, there is provided a means for preventing further intrusion of the ground bar after the protruding portion of the ground bar has passed through the through hole. Therefore, when the grounding rod is inserted into the grounding hole of the outlet after locking, even if the grounding hole is tight, the grounding rod is securely supported and does not go into the case. Further, when the grounding rod is inserted into the insertion portion, when the grounding rod is inserted to an appropriate position, the grounding rod does not enter any further, so that the grounding rod is not unnecessarily inserted.

According to a ninth aspect of the present invention, a circular bulging portion is formed at a distance closer to the front end than the locking body portion of the ground rod, and the ground rod is further in contact with the protruding portion forming the through hole. It is the structure which controls entering the insertion part. Therefore, when the earth bar is formed, it is only necessary to form a circular bulge part integrally with a part of the bar, so that the structure is simple and the cost is not much.

  Next, the best mode for carrying out the present invention will be described. In this embodiment, two blades 2 and 2 and a detachable grounding rod 3 are mounted on the front surface of the case 1. As shown in FIG. 3, the basic shape of the ground bar 3 is a long and narrow bar with a circular cross section, and a locking body 4 is formed at the rear. The cross-sectional shape of the locking body 4 is an oval shape as shown in FIG. The thickness between the pair of planar side surfaces 5 and 5 of the locking body 4 is substantially equal to the outer diameter of the circular cross section of the ground bar 3. The distance between the pair of arcuate ends 6 and 6 of the locking body 4 is longer than the outer diameter of the circular cross section of the ground bar 3. Therefore, the arc-shaped end portions 6 and 6 protrude outward from the circular outer peripheral surface of the ground bar 3. A circular bulging portion 7 is integrally formed with a little space ahead of the locking body 4.

  A ground bar insertion portion 8 is provided inside the case 1. The insertion portion 8 is a hollow portion having a circular cross section and is formed elongated. Crescent-shaped first protrusions 10 and 10 are formed to face each other slightly from the opening 9 of the insertion portion 8. As shown in FIG. 5, the first protrusions 10 and 10 are formed to form an oval through hole 11. The insertion portion 8 is divided into a front insertion portion 12 and a rear insertion portion 13 with the first protrusions 10 and 10 as a boundary. The inner diameter of the rear insertion portion 13 is longer than the inner diameter of the front insertion portion 12. The width of the first projecting portions 10 and 10 measured in the length direction of the insertion portion 8 is slightly shorter than the gap portion 17 between the locking barrel portion 4 and the bulging portion 7 of the ground bar. Therefore, the first protrusions 10 and 10 can enter the gap portion 17.

  Adjacent to the back of the first protrusions 10, 10 described above, crescent-shaped second protrusions 14, 14 are provided in the rear insertion part 12 so as to face each other. The 2nd protrusion parts 14 and 14 are provided in the position rotated 30 degrees from the 1st protrusion parts 10 and 10 to the right. Since the inner diameter of the rear insertion portion 13 provided with the second protrusions 14 and 14 is larger than the inner diameter of the front insertion portion 12 provided with the first protrusions 10 and 10, the second insertion portion 13 as shown in FIG. The protrusions 14 and 14 hardly block the through hole 11. Therefore, when the locking body 4 of the ground bar 3 is inserted from the opening 9 and is further inserted through the through-hole 11, the locking body 4 passes through the second protrusions 14 and 14 without being obstructed. FIG. 8 is a view in which the coil spring 15 and the cover 16 in the insertion portion 8 are omitted. As shown in FIGS. 6 and 7, by providing the second protrusions 14, 14, the width of the insertion portion therebetween becomes narrower and a narrow insertion portion 18 is formed. The narrow insertion portion 18 has a shape and the like that are the same as those of the through hole 11, but is different.

  A coil spring 15 is disposed in the rear insertion portion 13. A cover 16 is covered on the front end of the coil spring 15. The coil spring 15 is in a compressed state in the rear insertion portion 13, and the cover 16 is locked to the second projecting portions 14 and 14 so that the coil spring 15 does not jump out.

  Next, a method of using the present invention will be described. First, a method for attaching the ground bar 3 to the case 1 will be described. As shown in FIG. 8, when the blades 2 and 2 are above the insertion portion 8, the through hole 11 is horizontally long. Therefore, as shown in FIG. 1, when the case 1 is held in the hand as shown in FIG. 1, the oval shaped locking body 4 is also held in the hand so as to be horizontally long. Then, the locking body 4 is inserted into the front insertion portion 12 as it is in the opening 9. Since the locking body 4 and the through hole 11 have the same oval shape and are horizontally long, the locking body 4 passes through the through hole 11 and hits the cover 16. Therefore, the ground bar 3 is pushed in against the elasticity of the coil spring 15. The coil spring 15 is further compressed, and the locking body 4 is completely inserted through the through hole 11 and inserted into the rear insertion portion 13. However, the front portion of the locking barrel 4 remains in the narrow insertion portion 18, and this state is shown in FIGS. In addition, when the locking barrel 4 is inserted into the rear insertion portion 13, a state where the portion between the locking barrel 4 and the bulging portion 7 of the ground bar exists in the through hole 11 is shown. FIG. 5 shows the result.

  The state of the narrow insertion portion 18 when the locking body portion 4 is inserted into the rear insertion portion 13 is as shown in FIG. Therefore, the corner of the locking body 4 hits the inner surface of the through hole 11 and cannot be rotated to the left rear. Therefore, when the locking body 4 is rotated approximately 45 degrees to the right, the state shown in FIG. 6 is obtained. The corner portion of the locking body 4 hits the inner surface of the through hole 11 and does not rotate any further. A part of the rotated locking body 4 overlaps the first protrusions 10 and 10 shown in FIG. The grounding rod 3 biased in the direction of exiting from the insertion portion 8 by the coil spring 15 does not come out due to the locking action caused by the overlap between the locking body 4 and the first protrusions 10 and 10. As a result, the case 1 can be used with the ground bar 3 attached thereto.

  When the ground bar 3 is attached to the case 1 and is in the state shown in FIG. 6, when the ground bar 3 is removed from the case 1, the ground bar 3 is rotated to the left. The force of the coil spring 15 that presses the ground bar 3 is not so strong, and the force for rotating the ground bar 3 is in a plane perpendicular to the ground bar 3, whereas the force that the coil spring 15 presses is the ground bar. Is in the same direction. Therefore, the resistance due to the force of the coil spring 15 is very small when the ground bar 3 is rotated. Therefore, even if the ground bar 3 is biased by the coil spring 15, the ground bar 3 can be easily rotated with a small force. When the earthing rod 3 is rotated to the left, the state returns to the state shown in FIG. 7 and the position of the locking body 4 coincides with the narrow insertion part 18 shown in FIG. Get out naturally. As a result, the ground bar 3 can be removed from the case 1. By attaching a grounding rod holding piece formed of a flexible resin and having a hole into which the grounding rod 3 is tightly inserted to the case 1, if the grounding rod is inserted into the hole when not needed, the grounding rod Can be lost.

Sectional view before attaching grounding rod of the present invention Sectional view after attaching the grounding rod of the present invention Perspective view before inserting the grounding rod Perspective view with grounding rod inserted AA sectional end view in FIG. BB cross-sectional end view in FIG. Sectional end view at the BB line position before rotating the inserted grounding rod Front view of case without coil spring and cover Case top view

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Case 2 Blade 3 Grounding rod 4 Locking trunk | drum 5 Planar side surface 6 Arc-shaped edge part 7 Swelling part 8 Insertion part 9 Opening 10 1st protrusion part 11 Through-hole 12 Front insertion part 13 Back insertion part 14 Second protrusion part 15 Coil spring 16 Cover 17 Clearance 18 Narrow insertion

Claims (9)

An electric wire plug that has an insertion part for inserting the grounding rod in the case and can be detachably attached to the grounding rod. When the grounding rod is inserted into the insertion part, the grounding rod is inserted into the insertion part. There is an elastic member in the insertion portion that urges in the direction of pushing out from the ground, and when the inserted ground rod is rotated by a predetermined angle about the axis, the ground rod is inserted by the reaction force of the elastic member. A plug for electric wire, wherein a locking structure for restricting slipping out of the grounding rod is provided in the ground bar and the insertion portion, and the locking structure cooperates to restrict the grounding rod from slipping out. The locking structure provided on the ground bar is a protruding part of the ground bar formed so as to protrude outside the outer peripheral surface of the ground bar, and the locking structure provided on the insertion part is inserted The through hole is formed by providing a protrusion on the inner surface of the part, and the through hole has a shape that can be passed with the protrusion of the ground bar only when the ground bar is inserted into the through hole at a fixed position. After the protrusion of the grounding rod has completely passed through the through-hole, the grounding rod overlaps with the projection forming the through-hole by rotating the grounding rod about its axis. The electric wire plug according to claim 1, wherein the wire is prevented from being pulled out by an urging force of the elastic member. The grounding rod is integrally provided with a locking barrel portion whose outer periphery is formed in an oval shape, and at least both end portions of the oval shape of the locking barrel portion are protruding portions of the grounding rod that protrude beyond the outer peripheral surface of the grounding rod. When the through hole having an oval shape larger than the locking body is formed in the insertion portion, and the ground rod is rotated about its axis after the projecting portion of the ground rod passes through the through hole, the ground rod The electric wire plug according to claim 2, wherein the protruding portion forming the through hole overlaps with the protruding portion. Means for restricting the ground bar from rotating further after rotating a predetermined rotation angle when the ground bar rotates around its axis after the projecting portion of the ground bar passes through the through-hole. The electric wire plug according to claim 3, which is provided in the insertion portion. A rear protrusion is provided on the inner surface deeper than the insertion port of the insertion section, and when the locking barrel rotates a predetermined rotation angle, the locking barrel is in a position where it hits the rear protrusion. The electric wire plug according to claim 4, wherein the protruding portion is provided. The electric wire plug according to claim 4 or 5, wherein means for restricting the earth bar from rotating in a direction opposite to a predetermined rotation direction is provided in the insertion portion. A second inner protrusion is provided on the inner surface behind the insertion port of the insertion portion, and when the locking barrel is about to rotate in a direction opposite to the predetermined rotation direction, the locking barrel is The electric wire plug according to claim 6, wherein a second inner protrusion is provided at a position where the second inner protrusion protrudes. 8. The electric wire plug according to claim 2, further comprising means for preventing further intrusion of the ground bar after the projecting portion of the ground bar passes through the through hole. A circular bulging portion is formed at a distance closer to the front end than the locking body portion of the grounding rod, and the grounding rod hits the protruding portion forming the through hole, and the grounding rod further enters the insertion portion. The plug for electric wires of Claim 8 which regulates this.

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