JP2010251199A - Plug cover, and blower - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plug cover to be smoothly opened in a covering part (a surrounding elastic film part, a skirt part) thereof to prevent it from being twisted and torn in the state of using it for a fall-stopper outlet. <P>SOLUTION: This plug cover includes: a sheath part 21a to be fitted to a front part of a plug body 11a of an insert plug 11; a bottom plate 21b covering the front end of the plug body and formed with bottom holes for passing plug blades 11b; a pyramid-shaped skirt part 21d provided in the periphery of the bottom part of the sheath part; and an annular skirt end part 21f formed in the end of the skirt part and having a round cross section. An angle formed by an axis of the plug blade and the skirt part is an obtuse angle more than 45° and less than 90°, and when the insert plug is inserted into the outlet 31, the nearly whole surface of the inner surface of the skirt is tightly fitted to the outlet. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a plug cover for preventing plugging plug tracking and a blower in which a plug cover is attached to a power plug (plug plug).

  2. Description of the Related Art Conventionally, a leakage prevention cover that is attached to an insertion plug that is inserted into an outlet for taking out electric power from an outlet provided at a terminal of a branch circuit of a power supply, and includes a fitting portion that fits into the insertion plug, and a ring A sealing portion that connects the fitting portion and the sealing portion and simultaneously presses the sealing portion around the insertion plug, and dust or the like enters the gap between the outlet and the insertion plug. An electrical leakage prevention cover for plugs that prevents this is disclosed (for example, see Patent Document 1).

  Also, a bottom plate having a pair of bottom holes into which a pair of plug terminals are inserted, and an upper wall, a lower wall, a left sheath portion, and a right wall connected to the bottom plate and substantially surrounding the plug, Discloses a plug cover in which an encircling elastic membrane portion is formed so as to protrude forward (see, for example, Patent Document 2).

JP 2003-323933 A JP 2003-282176 A

  However, according to the conventional technique described in Patent Document 1, when the insertion plug is inserted into the outlet, the covering portion that presses the ring-shaped seal portion around the insertion plug is curved and floated, Only touch the power outlet. For this reason, there is a problem that a gap is formed in the step of the outlet or the curved surface of the design panel, so that dust can easily enter. Further, when the plug is used with a retaining outlet that rotates to prevent the plug from coming off, there is a problem that the covering portion is easily twisted and torn.

  Further, according to the conventional technique described in Patent Document 2, the angle formed by the surrounding elastic membrane portion and the plug terminal is an acute angle. For this reason, when the plug terminal is inserted into the outlet, the surrounding elastic membrane portion does not spread well and is bent. Therefore, there is a problem that a gap is formed between the outlet and the surrounding elastic membrane part, and dust is likely to enter. Further, when the plug is used with a retaining outlet that rotates the plug to prevent it from being detached, there is a problem that the surrounding elastic membrane portion is easily twisted and torn.

  The present invention has been made in view of the above, and is a plug cover that can be smoothly opened without difficulty and the cover portion (enclosed elastic membrane portion, skirt portion) can be twisted and torn even when used with a retaining outlet. The purpose is to obtain.

  In order to solve the above-described problems and achieve the object, the present invention includes a sheath portion that fits in the front portion of the plug body of the plug-in plug, and a bottom hole that covers the front end of the plug body and passes the plug blade. The plug blade having a bottom plate formed, a pyramidal hem provided on the outer periphery of the bottom of the sheath, and a circular hem end having a circular cross section formed at an end of the hem. The angle formed between the axis of the skirt and the hem is an obtuse angle greater than 45 ° and less than 90 °, and when the plug is inserted into the outlet, substantially the entire inner surface of the hem is in close contact with the outlet. And

  The plug cover according to the present invention has the effect that when the plug is inserted into the outlet, the hem portion opens smoothly without difficulty and is not twisted and torn even when used with a retaining outlet. In addition, since almost the entire inner surface of the hem is in close contact with the outlet, the contact area with the outlet is wide and the dustproof performance is high.

FIG. 1 is a rear view showing an embodiment of a plug cover according to the present invention. FIG. 2 is a side view of the plug cover according to the embodiment. FIG. 3 is a cross-sectional view of the plug cover of the embodiment. FIG. 4 is an enlarged view of a portion A in FIG. FIG. 5 is a cross-sectional view showing a state in which the plug cover of the embodiment is attached to the insertion plug. FIG. 6 is a cross-sectional view showing a state in which the plug with the plug cover attached is inserted into the outlet. FIG. 7 is a cross-sectional view showing a state in which the plug is inserted into the outlet protruding from the decorative panel. FIG. 8 is a cross-sectional view showing the force acting on the plug cover when the plug is inserted into the outlet. FIG. 9 is a perspective view showing a state in which a plug cover is attached to the plug of the blower.

  Hereinafter, embodiments of a plug cover and a blower according to the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment FIG. 1 is a rear view showing an embodiment of a plug cover according to the present invention, FIG. 2 is a side view of the plug cover of the embodiment, and FIG. 3 is a plug cover of the embodiment. FIG. 4 is an enlarged view of a portion A in FIG. 3, and FIG. 5 is a cross-sectional view showing a state in which the plug cover of the embodiment is attached to the insertion plug.

  The plug cover 21 according to the embodiment is formed of silicon rubber or the like having elasticity, flame retardancy, and tracking resistance. As shown in FIGS. 1 to 5, the plug cover 21 includes a rectangular tube-shaped sheath portion 21 a that fits into a rectangular parallelepiped front portion of the plug body 11 a of the plug 11, and a bottom plate that covers the front end of the plug body 11 a. 21b, a bottom hole 21c formed in the center of the bottom plate 21b and through which the plug blade 11b passes, a pyramidal hem portion 21d provided on the outer periphery of the bottom portion of the sheath portion 21a, and a circular cross section formed at the end of the hem portion 21d And an annular hem end 21f. The angle formed by the axis of the plug blade 11b and the skirt portion 21d is an obtuse angle exceeding 45 ° and less than 90 °.

  The plug cover 21 is usually attached to a power plug (insertion plug 11). The power plug is inserted and twisted into a retaining outlet that is twisted to prevent it from being pulled out.

  FIG. 6 is a cross-sectional view showing a state in which the plug with the plug cover attached is inserted into the outlet. As shown in FIG. 6, when the plug blade 11b is inserted into the outlet 31, the hem end 21f expands so as to slide on the outlet 31 and the decorative panel 32, and the substantially entire surface of the hem inner surface 21e is the outlet 31 and the decorative panel. 32 is in close contact with the front surface.

  FIG. 7 is a cross-sectional view showing a state in which the plug is inserted into the outlet protruding from the decorative panel. As shown in FIG. 7, even if the outlet 31 protrudes slightly from the decorative panel 32 and there is a slight level difference 31a between them, any part of the hem inner surface 21e is in close contact with the outlet 31 and the decorative panel 32, and the plug Dust proofing against the blade 11b is ensured. Further, since the skirt end 21f is formed in an annular shape having a circular cross section, the skirt end 21f is not caught by the step 31a.

  Silicone rubber has a property of being easily torn, but the bottom end 21f is formed in a circular cross section having a diameter larger than the wall thickness of the bottom 21d to eliminate corners, thereby reducing stress concentration and making it difficult to tear. When the diameter of the circular cross section of the hem end 21f is 1.2 to 2 times the wall thickness of the skirt 21d, the strength is about 1.7 to 8 times, and the structure is difficult to tear.

  The bottom hole 21c is formed in a size that does not contact the plug blade 11b so that the edge of the bottom plate 21b does not come into contact with the pair of plug blades 11b when the plug cover 21 is attached to the insertion plug 11. . Further, the inner dimension of the sheath portion 21a is made about 1 mm smaller than the outer dimension of the plug body 11a. When the plug cover 21 is attached to the plug 11, the sheath 21 a is widened. Since the sheath portion 21a fastens and closely contacts the plug body 11a, no gap is formed between the sheath portion 21a and the plug body 11a, and high dustproof performance is obtained.

FIG. 8 is a cross-sectional view showing the force acting on the plug cover when the plug is inserted into the outlet. As shown in FIG. 8, the force F that plugged the attachment plug 11 into the outlet 31 is transmitted to the skirt portion 21d, the wall parallel to the force F ₁ of the skirt 21d is generated. The force F ₁ is a force F _{2 in a} direction to push the surface of the outlet 31 or the decorative panel 32 vertically at a point P where the hem end 21 f and the outlet 31 or the decorative panel 32 come into contact, and the surface of the outlet 31 or the decorative panel 32. parallel, to generate a force F ₃ to widen the skirt portion 21d and.

The ratio of the magnitudes of the force F ₂ and the force F ₃ is determined by the angle θ formed by the axis of the plug blade 11b and the skirt portion 21d, and when the angle θ is in the range of 0 ° ≦ θ ≦ 45 °, F ₂ ≧ F _{3. In} the range of 45 ° <θ <90 °, F ₂ <F ₃ is satisfied. If the angle θ is greater than 45 °, the force F _{3 in the} direction of expanding the skirt portion 21d becomes larger than the force F _{2 in the} direction of pushing the surface of the outlet 31 or the decorative panel 32 vertically, so that the skirt portion 21d. Becomes easier to open. The angle θ formed by the axis of the plug blade 11b and the skirt portion 21d is preferably an obtuse angle exceeding 45 ° and less than 90 °. For example, if the angle θ is 50 °, the force F ₃ is about 1.2 times as large as the force F ₂ , so that the skirt portion 21 d can be easily opened.

Further, as shown in FIG. 4, the bottom end 21f is formed so that the cross-sectional circle of the bottom end 21f is in contact with the bottom inner surface 21e at the contact 21g. The diameter of the circular cross section skirt edge 21f against the wall thickness of the skirt portion 21d, than to 1.2 times or more, as shown in FIG. 8, the wall parallel to the force F ₁ of the skirt portion 21d is, skirt end against circular section parts 21f, it joined larger the contact point P (contact point 21g) side, the rotational force _{F 4} is generated in the circular cross section Susotan portion 21f.

Rotational force _{F 4} generates a force _{F 5} for pressing the skirt portion 21d into the outlet 31 or the decorative panel 32 side, as a result, the skirt portion 21d is longer float from the outlet 31 or the decorative panel 32, the skirt inner surface 21e are outlets 31 or Adheres closely to the decorative panel 32. As a result of the test, the angle θ of the skirt portion 21d is approximately 50 °, the thickness of the skirt portion 21d is 0.5 mm or more and 0.75 mm or less, and the diameter of the circular cross section of the hem end portion 21f is relative to the thickness of the skirt portion 21d. By setting it to 1.2 times or more and 2 times or less, the skirt portion 21 d is easily opened, and the substantially entire surface of the skirt inner surface 21 e is in close contact with the outlet 31 and the decorative panel 32.

  FIG. 9 is a perspective view showing a state in which a plug cover is attached to the plug of the blower. As shown in FIG. 9, the plug 11 according to the embodiment is used as a power plug of the blower 41. The plug cover 21 of the embodiment is attached to the plug 11.

  The blower 41 is an installation machine and is often installed in a place such as a ceiling where the user does not directly touch, and the power plug is always connected to the power source and accumulates dust. By attaching the plug cover 21 of the embodiment to the plug 11, tracking is prevented and safety is improved.

  As described above, the plug cover and the blower according to the present invention are suitable for connection to a retaining outlet.

DESCRIPTION OF SYMBOLS 11 Plug 11a Plug main body 11b Plug blade 21 Plug cover 21a Sheath part 21b Bottom plate 21c Bottom hole 21d Bottom part 21e Bottom inner surface 21f Bottom end part 21g Contact 31 Outlet 31a Step 32 Cosmetic panel 41 Blower

Claims (5)

A sheath that fits into the front of the plug body of the plug,
A bottom plate that covers the front end of the plug body and has a bottom hole through which the plug blade passes;
A pyramidal hem provided on the outer periphery of the bottom of the sheath;
An annular skirt end having a circular cross section formed at the end of the skirt,
The angle between the axis of the plug blade and the skirt is an obtuse angle of more than 45 ° and less than 90 °, and when the plug is inserted into an outlet, substantially the entire inner surface of the hem is Plug cover characterized by close contact with the outlet.   The plug cover according to claim 1, wherein an angle formed by the axis of the plug blade and the skirt is approximately 50 °.   The plug cover according to claim 1 or 2, wherein the material is silicon rubber, and the thickness of the skirt is 0.5 mm or more and 0.75 mm or less.   The plug cover according to any one of claims 1 to 3, wherein a diameter of a circular cross section of the skirt end portion is 1.2 times or more and 2 times or less of a thickness of the skirt portion.   A blower comprising the plug cover according to any one of claims 1 to 4 attached to an insertion plug.

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