JP2002056929A - Magnet plug - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable to be taken off by a tensile force with an angle acting on a power cord even in the case a contact recess part is formed deep for electrical safety reason with a magnet plug used for a power cord for an electric pot or the like. SOLUTION: With the magnet plug 1 having a plug case 2 held in free attachment and detachment by attraction force of a magnet to a plug receptacle 12, a protrusion 8 having a slanting face 8a on the outside face of the plug case 2, to keep in contact with the opening end of the plug receptacle at a slanting movement of the plug, so that it can be taken off from the plug receptacle 12 by an outward horizontal component force P2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnet plug used for home electric appliances such as electric pots.

[0002]

2. Description of the Related Art In a household electric appliance such as an electric pot, a magnet plug has been conventionally used in order to prevent the household electric appliance from falling down and other accidents when a power cord is caught by a person. When a certain amount of pulling force acts on the power cord, if the pulling direction is inclined with respect to the attracting surface of the magnet plug,
The magnet plug is inclined in the pulling direction and the attractive force of the magnet is weakened and detached. When a tensile force acts on the attracting surface at right angles, the magnet plug does not tilt and comes off when the tensile force exceeds the attracting force of the magnet.

In the above magnet plug, an iron piece magnetized by a magnet is attached to the center of the front end face of the plug case, and contacts are provided on the inner bottom surfaces of contact recesses provided on both sides thereof. The plug receiver has an iron piece inside, and electrodes facing the contact recess are protruded on both sides of the iron piece.

As described above, when the magnet plug is inclined and comes off, if the contact recess is too deep, there is a problem that the electrode and the inner surface of the contact recess are twisted to make it difficult to come off. This makes it easier for the fingertip to touch the contact point, which causes a problem in terms of safety. The depth of the contact recess is set to an appropriate depth in consideration of these points.

However, in recent years, in the above-described magnet plug, there is a demand for forming the contact recess more deeply from the viewpoint of electrical safety that a fingertip does not touch a contact of the plug. As an example of the countermeasure, as shown in FIG. 1 showing an embodiment of the present invention, it is considered to provide an annular protrusion 6 around the opening of the contact recess 4. The contact recess 4 becomes deeper by the height of the annular projecting portion 6, and safety is increased.

[0006]

When the magnet plug provided with the annular protrusion 6 as described above is used, an upward pulling force is applied to the magnet plug 1 inserted into the plug receiver 12 as shown in FIG. And the plug receiver 12
The electrode 16 on the side interferes with the inside of the contact recess 4 and the inner periphery of the annular protrusion 6, causing so-called torsion, thereby limiting the inclination of the magnet plug 1. Therefore, the plug receiving side 1
Since the opening of the attracting surface between the iron piece 15 and the iron piece 3 magnetized by the magnet on the side of the magnet plug 1 does not become sufficiently large, the magnet plug 1 becomes difficult to come off, which may cause a situation such as a fall of the home electric appliance. is there.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a magnet plug which can be reliably detached even when the contact recess 4 is deepened by applying an angled and more than a certain tensile force.

[0008]

According to another aspect of the present invention, there is provided a magnet plug having a plug case which is detachably held by a magnet attracting force to a plug receiver. A projection having an inclined surface is provided on the outer surface of the plug case, and the inclined surface is brought into contact with the opening end of the plug receiver when the plug is tilted.

According to the above structure, when an angled or more intense tensile force acts on the magnet plug,
Before the magnet plug is tilted and the electrode and the contact recess are twisted, the inclined surface of the projection comes into contact with the opening end of the plug receiver, and the horizontal outward component force acting on the inclined surface causes the magnet plug to be bent. The force in the pull-out direction works. When the force in the disengagement direction exceeds the attraction force of the magnet, the magnet plug separates from the attraction surface of the magnet and separates from the plug receiver.

The height of the projection is set to a height at which the inclined surface of the projection can come into contact with the opening end of the plug receiver before the tilting of the magnet plug is restricted by the twisting of the electrode and the contact recess. Shall be set.

It is possible to adopt a configuration in which the above-mentioned projections are provided on any one of four sides of the upper, lower, left and right sides of the magnet plug, or on a plurality of arbitrary sides. According to this configuration,
By the action of the pulling force in any one of a specific direction or a plurality of directions provided with the projections, the magnet plug can be reliably removed in the same manner as described above.

Further, a configuration in which a pair of the protrusions are provided corresponding to a pair of contact recesses provided on the front end surface of the plug case can be adopted. According to this configuration, since the magnet plug is supported by the pair of projections, the posture is stabilized.

Further, by providing an annular projection in the opening of the contact recess provided on the front end face of the plug case, the distance from the opening to the contact in the contact recess is set to a predetermined size. A configuration can be employed. According to this configuration, the contact recess becomes deeper by the height of the annular projecting portion, but the projection comes into contact with the plug receiver before the electrode is twisted, so that the magnet plug is easily detached. You.

[0014]

Embodiments of the present invention will be described below with reference to the accompanying drawings. As shown in FIG. 1, a magnet plug 1 of the first embodiment is for an electric pot, and iron pieces 3, 3 which are magnetized by a pair of magnets are exposed at the center of the front surface of a plug case 2. Contact recesses 4, 4 are provided on both sides of the iron pieces 3, 3, respectively. Resilient contacts 5, 5 are provided on the inner bottom surfaces of the contact recesses 4, 4, and annular protrusions 6, 6 are provided in the openings of the contact recesses 4, 4.
The protruding height of the annular protruding portions 6, 6 is
It is only slightly protruding forward (see FIG. 4D).

The slopes 7 and 7 as positioning portions are provided at both ends of the corner formed by the front and top surfaces of the magnet case 2.
Is formed. A pair of triangular protrusions 8 are formed on the upper surface of the magnet case 2 behind the inclined surface 7 in correspondence with the contact recesses 4. Each projection 8
On the front surface thereof, inclined surfaces 8a, 8a having a constant inclination angle are formed, and in use (see FIG. 3A), the inclined surfaces 8a, 8a are slightly spaced from the inner periphery of the open end of the plug receiver 12. Is formed at the position and height facing each other.

In addition, a power cord 11 is inserted into the rear end of the plug case 2 via an insulating bush 9 and connected to the contacts 5 and 5 in the contact recesses 4 and 4 inside.

The plug receiver 12 is provided below the pot body 13 as shown in FIGS. The plug receiver 12 has an iron piece 15 provided inside a rectangular frame portion 14, and electrodes 16, 16 are provided on both sides of the iron piece 15. The inner surface of the frame portion 14 is formed such that a portion near the opening end becomes a tapered surface 17 which spreads outward. The above frame portion 14
At the corners formed by the upper surface and both side surfaces, there are provided inclined ribs 18, 18 as positioning fitting portions matching the positioning inclined surfaces 7, 7 of the magnet plug 1.

The magnet plug 1 is inserted into the plug receiver 12 along the inclined ribs 18, 18 and the slopes 7, 7, and the electrodes 16, 16 of the plug receiver 12 are contact recesses of the magnet plug 1. 4 and 4 and contact the contacts 5 and 5 inside. This results in a conductive state. The iron pieces 3, 3 of the magnet plug 1 are held by being attracted to the iron pieces 15 on the plug receiver 12 side.

Now, an upward pulling force acts on the power cord 11 for any reason, and the magnet plug 1
As shown in (b), if the projection 8 is tilted upward, the inclined surface 8 a of each projection 8 comes into contact with the inner periphery of the open end of the plug receiver 12. Since the inclination angle at this time is small, the electrode 16 and the inner surface of the contact recess 4 and the electrode 16 and the annular protrusion 6 do not twist. In other words, the height of each projection 8 is set so that the inclined surface 8a hits the inner periphery of the open end of the plug receiver 12 before the twisting is restricted due to the occurrence of twisting in these portions.

As described above, the inclined surface 8a is connected to the plug receiver 1
In the state where it hits the inner periphery of the opening end of the iron piece 15, the iron piece 15
The attraction surface between the iron piece 3 and the iron piece 3 is opened at an angle, but since the angle is small, the attraction force is greater. Therefore, the magnet plug 1 does not come off. Further, a drag P0 acts on the inclined surface 8a due to the pulling force from the power cord 11, and the outward horizontal component P2 exceeds the above-mentioned suction force, so that both suction surfaces are separated from each other. In fact,
Since the pulling force acting on the power cord 11 has a horizontal outward component, this force is added to the horizontal component force P2.
As shown in FIG. 4, the magnet plug 1 comes off the plug case 12.

When the pulling force acting on the power cord 1 is perpendicular to the suction surface of the iron piece 15 and has no angle, it is directly separated at the suction surface as in the conventional case.

[0022]

As described above, according to the present invention, the projection having the inclined surface is provided on the outer surface of the plug case, and the inclined surface is brought into contact with the opening end of the plug receiver when the plug is tilted. Even when the contact recess is deepened, the magnet plug can be easily and reliably removed from the plug receiver by the angled pulling force acting on the power cord, thereby preventing the electric pot or the like from falling over.

[Brief description of the drawings]

FIG. 1A is a front view of an embodiment of a magnet plug. FIG. 1B is a side view of the embodiment. FIG. 1C is a perspective view of the embodiment. FIG.

FIG. 2 is a front view of an embodiment of a plug receiver.

3A is a cross-sectional view in a state of use; FIG. 3B is a cross-sectional view of the same when the magnet plug is tilted;

FIG. 4 is a sectional view of a separated state of a magnet plug.

FIG. 5 is a cross-sectional view of a state of use of a conventional magnet plug.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magnet plug 2 Plug case 3 Iron piece 4 Contact recess 5 Contact 6 Annular protrusion 7 Slope 8 Projection 8a Inclined surface 9 Insulation bush 11 Power cord 12 Plug receiver 13 Pot body 14 Frame part 15 Iron piece 16 Electrode 17 Tapered surface 18 Inclined rib

 ──────────────────────────────────────────────────の Continued on the front page F term (reference) 4B055 AA34 BA38 CA63 CC14 CC38 DB01 FD10 5E021 FA03 FA14 FA16 FB07 FB21 FC31 FC36 HB15 HC27

Claims (5)

[Claims] 1. A magnet plug having a plug case which is detachably held by a magnet attracting force with respect to a plug receiver, wherein a projection having an inclined surface is provided on an outer surface of the plug case. A magnet plug, which is brought into contact with an opening end of a plug receiver. 2. The height of the projection is set to such a height that its inclined surface can contact the opening end of the plug receiver before the tilting of the magnet plug is restricted. Item 2. The magnet plug according to Item 1. 3. The magnet plug according to claim 1, wherein a pair of the projections are provided corresponding to a pair of contact recesses provided on a front end surface of the plug case. 4. A distance from the opening to the contact in the contact recess is set to a predetermined size by providing an annular projection in the opening of the contact recess provided on the front end face of the plug case. The magnet plug according to any one of claims 1 to 3, wherein: 5. The magnet plug according to claim 1, wherein positioning portions are formed at both ends of a corner formed by a front end surface of the plug case and an upper surface thereof.