JPH0739179Y2 - Plug device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Use The present invention relates to a plug device in which a blade is rotatably provided to facilitate insertion of the blade into an outlet located in a narrow space, and particularly to a power supply. The present invention relates to a plug device provided integrally with an adapter or the like.

(B) Conventional Technology As a plug to be inserted into an outlet located in a narrow space such as a shadow of an object, there is a plug provided with a rotatable blade as disclosed in JP-A-60-50875. In this way, by rotatably providing the blade in the plug or adapter, the attitude of the plug or adapter with respect to the outlet can be changed according to the space, and the blade can be easily installed even in an outlet located in a narrow space. Can be inserted.

(C) Problem to be Solved by the Invention However, in the conventional plug, the blade is rotatably caulked to the conductor wire inside the housing such as the plug, and the blade is made rotatable at the caulking portion. Also, only in this portion is the conductor electrically connected. As described above, since the electrical connection and the mechanical support are made only by the crimping of the blade and the conductive wire, the mechanical support is loosened due to deterioration with time due to the rotation of the blade. Due to this looseness, the electrical connection state is deteriorated, and there is a problem that heat is generated in the caulked portion. Such a problem becomes a serious problem particularly in a plug provided in a power supply adapter including a transformer circuit.

The purpose of this invention is to realize the respective functions of mechanical support and electrical connection of the blade in the housing by using different members, and to enable the rotation of the blade to be selectively regulated. In addition to preventing loosening due to deterioration over time in the mechanical support part, this loosening also prevents the electrical connection state from easily deteriorating, so that there is no poor connection between the blade and the conductor, and accidents such as heat generation. It is to provide a plug device that can prevent the utterance of.

(D) Means for Solving the Problems A plug device according to the present invention is a lever that is restricted from rotating with respect to a housing and is axially movable, and a plug blade that is rotatable around a peripheral surface of the lever. A support fixed to the lever, a protrusion formed on a part of the peripheral surface of the lever, and a recess formed at two locations on the support having a rotation angle of 90 degrees, and the protrusion is fitted in the axial direction of the lever. A spring for urging the lever in the direction in which the protrusion fits in the recess.

(E) Action In the present invention, the blade together with the support is rotatable around the peripheral surface of the lever. When the protrusion of the lever is axially fitted into one of the recesses of the support, the rotation of the support with respect to the lever is restricted. Since the protrusion of the lever is biased by the elastic force of the spring in the direction of fitting into the recess of the support, the protrusion fits into the recess in a normal state, and the rotation of the support with respect to the lever is restricted. . in this way,
Since the blade is rotatably attached to the lever via the support, the terminal electrically connected to the blade can be provided without considering the mechanical support state.

(F) Embodiment FIG. 1 is an external view of a power adapter to which a plug device according to an embodiment of the present invention is applied.

The power supply adapter 21 has a switching power supply circuit therein and converts a commercial power supply voltage into a predetermined DC voltage. In the power supply adapter 21, the blade 1 is rotatable in the plug portion 2. That is, the supports 3a, 3b to which the blade 1 is fixed in the plug portion 2 are rotatable on the peripheral surface of the shaft 4.

FIG. 2 is an assembly diagram showing a configuration of a main part of the plug portion of the power adapter.

A shaft 4a is integrated with the lever 4. The shaft 4a has chamfered upper and lower surfaces, and the chamfered portion is engaged with and supported by the casing of the power supply adapter 21 so that it cannot rotate and can move in the axial direction. Supports 3a and 3b are externally fitted on the peripheral surface of the shaft portion 4a. That is, the shaft portion 4
The outer diameter of a is substantially equal to the inner diameters of the holes 10a and 10b of the supports 3a and 3b. Therefore, the supports 3a and 3b are rotatable around the peripheral surface of the shaft portion 4a when the protrusions 5a formed on the shaft portion 4a do not interfere with each other.

The support 3a has a recess 6 formed on one end surface thereof,
Before the lever 4a is integrated with the lever 4, it is fitted onto the shaft portion 4a from the end surface on the lever 4 side. Further, the support body 3b is externally fitted from the end surface on the other end side of the shaft portion 4a. In this way, the support bodies 3a and 3b externally fitted to the shaft portion 4a are integrated by sandwiching the projections 5a formed on the shaft portion 4a from both sides in the axial direction. At the time of this integration, protrusions and engagement holes (not shown) are provided on the opposing surfaces of the supports 3a and 3b. In addition, another protrusion 5b is formed on the shaft portion 4a at a position rotated from the protrusion 5a by 180 degrees about the axial direction of the shaft portion 4a. Also, the supports 3a, 3b
Steps 9a and 9b formed on the side surfaces of the
The blade 1 is fixed. For this fixing, the supports 3a, 3b
The plug blade 1 may be insert-molded at the time of molding.

In the plug portion 2, one end of the spring 8 is in contact with the other end of the shaft portion 4a. As a result, the shaft portion 4a together with the lever 4 is always urged in the arrow A direction. This urging force acts when the shaft 4a and the supports 3a, 3b described above are assembled, so that the projections 5a, 5b formed on the shaft 4a are urged in the direction of the support 3a.

FIG. 3 is a plan sectional view of the plug portion of the power adapter.

In the plug portion, the lever 4 is movable along with the shaft portion 4a in the directions of arrows A and B within a predetermined range. Also,
As described above, the lever 4 is urged in the arrow A direction together with the shaft portion 4a by the elastic force of the spring 8. By this urging force, the protrusions 5a and 5b formed on the shaft portion 4a are fitted into the recesses 6 formed on the support body 3a. As is clear from the sectional view taken along the line X--X in FIG. 3 shown in FIG. 4A, the recess 6 formed in the support 3a has a square shape circumscribing the shaft 4a. The protrusions 5a and 5b formed on the shaft portion 4a are
In, the shape is formed so as to substantially fit in each of the two corners on the diagonal line. In this way, the projections 5a, 5
When b is fitted, the support 3a cannot rotate with respect to the shaft 4a. This also applies to the support 3b integrated with the support 3a. As mentioned above, shaft 4a
Is not rotatable within the plug portion 2, the support members 3a and 3b whose rotation is restricted by the shaft portion 4a cannot rotate relative to the plug portion 2 either.

On the other hand, as shown in the sectional view taken along the line YY of FIG. 3 shown in FIG. 4 (B), the concave portion 7 formed in the support 3b has a shape in which a circular part is cut out. That is, the concave portion 7 is composed of the circular arc portion 7a and the linear portion 7b. The straight line portion 7b is made to be a tangent to the shaft portion 4a, and the diameter of the arc portion 7a is made substantially equal to the diameter of the projections 5a and 5b formed on the shaft portion 4a. From the above, when the lever 4 is pressed in the direction of the arrow B against the elastic force of the spring 8 and the projections 5a and 5b are fitted into the recess 7, a part of the projection 5b is formed below the straight portion 7b of the recess 7. Will come into contact. This contact allows the support 3a to rotate only in the direction of arrow C shown in FIG. 4 (B) with respect to the shaft 4a. Further, this rotation is restricted by the upper portion of the linear portion 7b coming into contact with a part of the protrusion 5a. Therefore, the concave portion 7 restricts the rotation range of the supports 3a and 3b to 90 degrees by engaging with the protrusions 5a and 5b.

In addition, a terminal connected to an electric circuit (not shown) is fitted into the recess of the housing of the power adapter. This terminal is a support 3a, 3b
It contacts the blade 1 fixed to the side surface.

5 (A) to (D) are diagrams showing the operation of the main part of the plug portion of the power supply adapter, and are partial cross-sectional views in the front direction (plug blade direction) shown in FIG.

In a normal state, the lever 4 and the shaft portion 4a are biased in the direction of the arrow A by the elastic force of the spring 8 described above, and the protrusions 5a and 5b are fitted into the concave portion 6 of the support body 3a. This fitting restricts the rotation of the supports 3a and 3b (Fig. 5 (A)).

When the lever 4 is pressed in the direction of the arrow B, the supports 3a and 3b slide relative to the shaft 4a, and the projections 5a and 5b move to the support 3b.
It is fitted into the concave portion 7 (Fig. 5 (B)). When the blade 1 is in the state shown in FIG. 1, that is, in the state where it is projected horizontally in the housing of the power supply adapter 21, as shown in FIG. Part abuts and supports 3a, 3
b can rotate only in the direction of arrow C with respect to the shaft portion 4a.

With the lever 4 still pressed in the direction of arrow B, the blade 1
Is rotated 90 degrees in the direction of arrow C with the supports 3a and 3b,
In FIG. 4 (B), the linear portion 7b of the recess 7 does not come into contact with a part of the projection 5b, while the portion of the projection 5a comes into contact with the linear part 7b (FIG. 5 (C)). This restricts the rotation of the supports 3a, 3b in the direction of arrow C. At this time, the blade 1 projects in a direction orthogonal to the housing of the power adapter 21. When the blade 1 is projected in the direction orthogonal to the housing and the pressing of the lever 4 in the direction of the arrow B is released, the protrusion is projected.
5a and 5b are again fitted into the recesses 6 of the support 3a (FIG. 5 (D)).

Due to this fitting, the blade 1 is made non-rotatable again together with the supports 3a and 3b. At this time, when the lever 4 is pressed in the direction of the arrow B, the state shown in FIG. It can rotate only in the direction. That is, the blade 1 is rotatable with the supports 3a and 3b in the directions of arrows C and D within a range of 90 degrees. Further, the projections 5a and 5b cannot be fitted into the recesses 6 except at the position where the blade 1 is projected in a horizontal state or in a state orthogonal to the housing. Therefore, the rotation of the supports 3a and 3b is restricted only at the two positions.

As described above, according to this embodiment, the blade 1 can be rotated with respect to the housing only by pressing the lever 4. The rotation range of this blade 1 is limited to the range of 90 degrees by the engagement of the projections 5a, 5b and the concave portion 7, and the projections 5a, 5b
By fitting the b and the concave portion 6, the fixing is performed only at both end positions in the rotation range of 90 degrees. In this way, the blade 1 is a support
The rotation operation is realized only by the engagement between the shaft portions 4a and 3a, 3b. Therefore, the terminal inserted in the recess 22 shown in FIG. 3 can be exclusively electrically connected to the blade 1.
If the shape of the plug blade 1 inside the plug portion 2 is partially cut away as shown in FIG.
The power supply voltage can be applied to the switching power supply circuit of the power supply adapter 21 only at a position where the rotation of the blade 1 can be restricted. This means that power can be supplied only when the power adapter 21 is fixed to the outlet, which is extremely effective in safely using the power adapter 21.

(G) Effect of the Invention According to this invention, the mechanical support for the rotation operation of the blade can be performed by the support and the lever, and the rotation operation of the blade can be performed by fitting the protrusion and the recess. Can be regulated. Therefore, it is possible to prevent the blade from rotating unnecessarily, prevent loosening of the mechanical support even after long-term use, and the electrical connection state is independent of the mechanical support. This has the advantage that this can be maintained robustly and the occurrence of accidents such as heat generation can be prevented.

[Brief description of drawings]

FIG. 1 is an external view of a power adapter to which a plug device according to an embodiment of the present invention is applied, FIG. 2 is an assembly view showing the configuration of the main part of the plug portion of the power adapter, and FIG. 3 is the power adapter. FIG. 4A and FIG. 4B are plan sectional views of the plug part of FIG.
5A to 5D are front sectional views showing the operation of the main part of the plug portion of the power adapter. FIG. 6 is a side view showing the shape of a blade of another plug device of the present invention. 1 ... Blade, 2 ... Plug, 3a, 3b ... Support, 4 ...
… Lever, 4a… Shaft, 5a, 5b… Protrusion, 6,7… Recess,
8 ... Spring.

Claims (1)

[Scope of utility model registration request] 1. A lever whose rotation is restricted with respect to a housing and which is movable in an axial direction, a support body which is rotatably mounted on a peripheral surface of the lever and has a blade fixed thereto, and a peripheral surface of the lever. A protrusion formed in a part and a recess formed in two places on the support having a rotation angle of 90 degrees, the protrusion is fitted in the axial direction of the lever, and the lever is attached in the direction in which the protrusion is fitted in the recess. A plug device, which is provided with a biasing spring.