JP2834857B2 - Tabletop - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial applications]

TECHNICAL FIELD The present invention relates to a table tap provided with a blade receiving spring for receiving an insertion plug, and more particularly to a table tap whose body includes an inner case and an outer shell that covers the inner case.

[Prior art]

In a table tap, an arc may be generated when the plug blade of the insertion plug is inserted into and removed from the blade receiving spring, and heat may be generated at the contact portion between the plug blade and the blade receiving spring. On the inner peripheral surface of the case that houses the receiving spring,
Heat resistance and tracking resistance are required. Further, since the table tap is used movably, it may drop or hit another article, and the outer peripheral surface of the case is required to have impact resistance. By the way, since it is difficult to satisfy heat resistance, tracking resistance and impact resistance with the same material, a material having heat resistance and tracking resistance (generally, thermosetting synthetic resin) has been conventionally used. ) To form the inner case,
A conductor provided with a blade receiving spring in the inner case and an outer shell formed of a material having impact resistance (generally, a thermoplastic synthetic resin) on the outer periphery of the inner case is provided. I have. An example is shown in FIG. 4 and FIG. This table tap has an inner case 10 formed of a material having excellent heat resistance and tracking resistance, and an outer shell 20 formed of a relatively soft material having excellent impact resistance and surrounding the inner case 10. In addition, a portion of the inner case 10 where the blade insertion port 11 is provided is exposed at a key point of the outer shell 20. A power cord 30 is drawn out of the outer shell 20, and a plug 31 is connected to the other end of the power cord 30. As shown in FIG. 5, the inner case 10
It is formed by connecting a body 12 on which the bodies 2 and 32 are mounted and a cover 13 fitted on the body 12 with a connecting member 14 such as an assembly screw or a rivet. At the two places on the upper surface and one place on the front surface on the outer peripheral surface of the inner case 10,
15 are formed, and a pair of blade insertion holes 11 are opened in these protruding portions 15. Both conductors 32, 32 disposed in the inner case 10 are formed in a shape having a blade receiving spring 33 at a portion corresponding to each blade insertion slot 11, and a power cord is crimped at one end by crimping.
An electric wire connection portion 34 to which the electric wire 30 is connected is formed. Also,
The nail piece is cut and raised at the middle part in the longitudinal direction of each conductor 32.
35, 35 are formed, and both conductors 32, 32
5 and 35 are fixed to the body 12 by press-fitting into the locking holes 17 and 17 provided in the body 12. In the figure, reference numeral 19 denotes a partition wall that separates the conductors 32 from each other in the body 12. Then, when the cover 13 is put on the body 12 to which the conductor 32 is fixed as described above, and the body 12 and the cover 13 are coupled with the coupler 14, the electric wire connection portion 34 formed at one end of the conductor 32 is The power cord 30 protrudes from one end of the inner case 10, and is connected to the electric wire connecting portion 34 in this state by caulking. The outer shell 20 has a power cord as described above.
After connecting 30, it is formed by secondary molding on the outer circumference of the inner case 10, and wraps substantially the entire circumference excluding the surface of the protruding portion 15. The outer shell is also used for the split part of the wire connection part 34 and the power cord 30
Covered with 20.

[Problems to be solved by the invention]

In this case, after forming the inner case, the outer shell must be further formed in a dedicated mold,
And the molding die for forming the outer shell 20 covering the inner case 10 by secondary molding has a large capital investment compared to the ordinary molding die, because the power cord is already connected. Is needed. SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object thereof is to provide a table tap having an inner case and an outer shell that covers the inner case, which is easy to manufacture and improves productivity. To provide.

[Means for Solving the Problems]

Thus, the present invention provides a pair of conductors having a blade receiving spring,
An inner case containing these conductors and an outer shell covering the outer surface of the inner case. The inner case is formed of both a body and a cover, and the outer shell is a body of the inner case. It is characterized by comprising an outer body formed of two layers on the outer surface and an outer cover formed of two layers on the outer surface of the cover of the inner case. [Operation] According to the present invention, since the outer shell is also formed when the inner case is formed, a separate step for forming the outer shell is not required. EXAMPLES The present invention will be described below based on illustrated examples.
3 to 3, the inner case 10 and the conductor 32 are configured in the same manner as in the conventional example, but the body 12 and the cover 13 that constitute the inner case 10 are formed of a thermoplastic synthetic resin at the time of molding. The body 21 and the outer cover 22 are integrally formed by two-layer molding (plus tapping method), and the outer shell 20 includes the body 12 and the cover 13.
When combined with the fittings 14 with the
21 and an outer cover 22. Reference numeral 26 in the figure denotes an engagement portion provided on the outer body 21 to prevent the outer body 21 from peeling off from the body 12. cover
The same structure is adopted for the outer cover 13 and the outer cover 22. FIG. 3 shows a state in which a conductor 32 is mounted in the body 12 whose outer surface is covered by the outer body 21. When molding the body 12 and the cover 13 constituting the inner case 10, the outer body 21 and the outer cover 22 are also molded in each mold, and do not require a molding die dedicated to the outer shell 20. When the body 12 and the cover 13 are formed, the conductor 32 is not attached, and thus the power cord 30 is not connected. Therefore, it is not necessary to work on the power cord 30 at the time of molding. In the figure, reference numeral 39 denotes a code bushing.

【The invention's effect】

As described above, in the present invention, since the outer shell can also be formed at the time of molding the inner case, a separate step for forming the outer shell is not required, thereby improving productivity and reducing capital investment. It can be provided at low cost to save time, and the parts management is easier than when the body and cover of the inner case and the outer body and outer cover of the outer shell are formed separately, and the outer shell is turned up. There is no peeling and the quality is good.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of one embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA in FIG. 1, FIG. 3 is a perspective view of a body incorporating the same conductor, and FIG. FIG. 5 is an exploded perspective view of the same inner case as in the prior art, and FIG.
20 is the outer shell, 12 is the body, 13 is the cover, 21 is the body,
Reference numeral 22 denotes a cover, 32 denotes a conductor, and 33 denotes a blade receiving spring.

Claims (1)

(57) [Claims] 1. A pair of conductors having a blade receiving spring, an inner case in which these conductors are provided, and an outer shell covering an outer surface of the inner case. The outer shell comprises an outer body formed in two layers on the outer surface of the body of the inner case, and an outer cover formed in two layers on the outer surface of the cover of the inner case. Tabletop.