JP2006120330A - Power plug - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To dispense with a double structure of outer and inner cases, by providing an insulating cap for preventing a receiving terminal communicating with a connecting port (insertion port) from being short-circuited, in a power plug having the connecting port (insertion port) for an insertion terminal and other power plugs. <P>SOLUTION: A cap 32, surrounding the opposing piece of one receiving terminal 30 of a pair of receiving terminals 30, 30 arranged in a body case 22, is provided. The cap 32 made of a thermosetting resin can be mounted easily by inserting the facing piece into the insertion hole 33 to prevent short-circuiting with an adjacent receiving terminal 30. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a power plug with a simple structure that can be used safely in a power plug with a connecting portion used in electronic equipment, wiring devices, and the like.

  In general, for example, in order to supply power to an electronic device or the like, the power plug of the electronic device is inserted into an outlet (socket) and used. However, in order to easily connect other electronic devices in the vicinity of the electronic device, A power plug (addon plug) provided with a connection port in the plug body is used. Therefore, power can be supplied to other electronic devices by inserting the terminal of the power plug into the connection port (insertion terminal insertion port) of the power plug (addon plug).

A commercially available example of a conventional power plug (Adon plug) is shown in FIG. The power plug (addition plug) 1 has an outer main body case 2, an outer cover case 3, an inner main body case 4, and an inner cover case 5. The inner body case 4 is inserted into the outer body case 2, the inner cover case 5 is attached to the inner body case 4, and the outer cover case 3 covers the inner cover case 5 and is welded to the outer body case 2.
The inner cover case 5 has a pair of terminal insertion ports 6 and 6, and a wall portion defining the insertion ports 6 and 6 is carried by the outer cases 2 and 3.

The inner body case 4 includes a pair of insertion terminals 7, 7, a pair of conductors 8, 8 having a conductive relationship with the terminals 7, 7, and core wires 9, 9 individually connected to the conductors 8, 8. It has a power cord 10 and receiving terminals 11 and 11 that are electrically connected to the conductors 8 and 8 individually.
Each receiving terminal 11, 11 leads to the insertion openings 6, 6, and by inserting the insertion terminals 7, 7 of other power plugs into the insertion openings 6, 6, the electrical continuity relationship between them is established. The cord bush 12 is held by the butted surfaces of the outer main body case 2 and the outer cover case 3.

Japanese Utility Model Publication No. 48-57683 Japanese Utility Model Publication No. 50-14988 Japanese Utility Model Publication No. 51-141391 Japanese Utility Model Publication No. 60-59490

  A conventional power plug (Adon plug) with a connection port has a connection port in the inner cover case of the power plug, so the space inside the power plug body is limited, and the internal conductive part of the connection port is short-circuited. In order to prevent this, there has been a problem that the structure becomes complicated by further covering the inner body formed of a thermosetting resin with a thermoplastic resin in order to prevent insulation and increase the strength of the power plug body.

  In order to solve the above-described problem, the present invention employs a configuration in which a short-circuit prevention cap is disposed inside the power connection port of the power plug body.

  Furthermore, according to the present invention, the main body case, the pair of insertion terminals extending from the main body case, the pair of conductors arranged in the main body case and electrically connected to the insertion terminal, and a conductive core wire are provided. A power cord, a pair of receiving terminals electrically connected to each conductor individually, a cap for isolating at least one receiving terminal from the other receiving terminal, and a pair of receiving terminals fixed to the body case There is provided a power plug including a cover case having an insertion port for an insertion terminal of another power plug that communicates therewith.

  Preferably, the cap is held by the inner wall portion of the cover.

  According to the power plug of the present invention, in order to prevent an electrical short circuit between the connection terminal (receiving terminal) and the connection port (insertion port) in the power plug, the case of the power plug main body has a double structure by having an insulating cap. For example, if the material of the main body case is made of thermosetting resin, a power plug with a heat-resistant structure and high strength can be made, and the number of parts can be reduced, and highly safe products can be supplied. Become. Further, the power plug main body can be easily downsized.

As shown in FIGS. 1 to 3, a power plug 21 according to an example of the present invention includes a box-shaped main body case 22, a box-shaped cover case 23, a power cord 24 with a bush 25, and a pair of main body cases 22. It has connection terminals 26, 26 and connection ports provided in the cover case 23, that is, terminal insertion ports 27, 27. Both cases 22 and 23 are made of a thermosetting resin material.
The plug-in terminals 26 and 26 are individually electrically connected to the pair of conductors 28 and 28 in the main body case 22. The conductors 28 and 28 are connected to the core wires 29 and 29 of the power cord 24 in a conductive relationship.

A pair of spaced receiving terminals 30, 30 are arranged in the main body case 22. The receiving terminals 30 and 30 are press-molded in a substantially U-shape in a plan view of the conductive plate, and have a shape in which the opposing piece approaches and the opposing piece has elasticity.
The bush 25 of the power cord 24 is held on the side wall of the main body case 22. The main body case 22 has a substantially U-shaped partition wall 31 in a plan view, and one receiving terminal 30 is arranged in the partition wall 31 so that the opening of the partition wall 31 is oriented in the same direction as the direction of the insertion port 27.

A cap 32 made of synthetic resin is arranged in the main body case 22 so as to surround at least the opposing piece of the other receiving terminal 30. As shown in FIG. 4, the cap 32 is molded separately from the main body case 22.
The cap 32 has a rectangular through hole 33, a front wall portion 34, a side wall portion 35, and an inclined surface 36 of the other side wall portion. The front wall portion 34 and the side wall portion 35 are arranged so as to contact the inner wall surface of the corner portion of the main body case 22. The cap 32 is an electrical insulator that plays a role of preventing a short circuit between adjacent receiving terminals 30. In order to hold the cap 32, the upper side of the cap 32 may be sandwiched between the inner walls of the cover case 23.

  The cap 32 is attached by pushing up one of the insertion terminals 26 arranged on the main body case 22 and the conductor 28 and the receiving terminal 30 connected to the terminal 26 so that the one receiving terminal 30 is connected. This is done by lifting and inserting the opposing piece of one receiving terminal 30 into the through hole 33 of the cap 32 and pushing the cap 32 into the main body case 22. Preferably, the body case 22 is provided with a recess for receiving the lower portion of the cap 32 so that the position of the cap 32 with respect to the body case 22 is constant.

  After the cap 32 is attached so as to surround one of the receiving terminals 30, both the cases 22 and 23 are screwed. In use, power is supplied to the receiving terminals 30 and 30 by inserting the insertion terminals 26 and 26 into an outlet. For this reason, it becomes possible to supply power to the other electronic devices by inserting the power plugs of the other electronic devices into the insertion openings 27 and 27. One receiving terminal 30 can safely use the power plug 21 without short-circuiting the other receiving terminal 30 from the cap 32. The cap 32 may be thin and does not make the main body case 22 large.

It is a perspective view of the power plug of an example of the present invention. It is a disassembled perspective view of the example of FIG. It is a top view of a main body case. It is a perspective view of a cap. It is a disassembled perspective view which shows the power plug of a prior art example.

Explanation of symbols

21 Power Plug 22 Body Case 23 Cover Case 24 Power Cord 26 Plug Terminal 27 Insertion Port (Connection Port)
28 Conductor 29 Core wire 30 Receiving terminal 31 Bulkhead 32 Cap 33 Through-hole

Claims (5)

  A power plug having a power connection portion, wherein the power connection portion has a short-circuit prevention cap.   2. The power plug according to claim 1, wherein the power plug body is made of a thermosetting resin material.   A main body case, a pair of insertion terminals extending from the main body case, a pair of conductors arranged in the main body case and electrically connected to the insertion terminals, and a power cord having a conductive core, and each conductor individually A pair of receiving terminals electrically connected to each other, a cap for isolating at least one receiving terminal from the other receiving terminal, and a plug terminal for another power plug that is fixed to the main body case and communicates with the receiving terminal of the pair A power plug comprising a cover case having a slot for insertion.   The power plug according to claim 3, wherein the cap is held by an inner wall portion of the cover. The power plug according to claim 4, wherein at least a part of the other receiving terminal is covered with a partition wall integral with the main body case.

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