Electrical cord adapter

• US 4,273,406 A
• Filed: 12/28/1978
• Issued: 06/16/1981
• Est. Priority Date: 12/28/1978
• Status: Expired due to Term

• Current Assignee: Mitsuba Electric Manufacturing Company Limited
• Original Assignee: Mitsuoka Electric Manufacturing Company Limited
• Inventors: Okagami, Kuni
• Primary Examiner(s): McQuade, John
• Assistant Examiner(s): Brown, John S.
• Application Number:
  US05/974,023
• Time in Patent Office: 901 Days
• Field of Search: 339/147, 339/139, 339/196, 339/209, 339/206, 339/63, 339/138, 339/140
• US Class Current: 439/620.21
• CPC Class Codes: H01F 27/02 Casings
• CPC Class Codes: H01R 13/6675 with built-in power supply

Abstract

An adapter male electrical fitting to be received in a plug receptacle and connected to the end of the power cord of a household electric appliance, such as an electric shaver, radio or television set. The adapter is cylindrical, in which a transformer for ac-dc conversion or for stepping up or down the voltage is received, which transformer has a pair of plug blades or contact-making blades integrally attached thereto, thereby improving the efficiency of adapter assembly and reducing the size of the adapter.

Claims

1. An adapter for electric cords, comprising a transformer with a coil bobbin, having plug blades integrally attached thereto;

a bottomed, generally cylindrical casing having apertures for receiving said blades and at least one screw inserting aperture formed in its front wall;

a bottomed, generally cylindrical lid complementary to said casing and having an internally threaded lid pillar extending from a rear wall surface of said lid toward an open side;

temporary fixing means provided on said casing and said lid, respectively, for engagement with each other;

wherein said temporary fixing means include first inner and outer clamp walls to define a guide groove therebetween, provided on a peripheral wall of said casing, second inner and outer clamp walls to define a guide groove therebetween, provided on a peripheral wall of said lid, for engaging said first clamp walls, L-shaped apertures formed by notching said first clamp walls, and claws projecting from said second clamp walls for engaging said apertures; and

at least one screw for interconnecting said casing with said lid.

2. The adapter as defined in claim 1, wherein said bobbin has flanges, one of which is thickened to serve as a pedestal formed with slots for receiving therein inner ends of said blades.

3. The adapter as defined in claim 2, wherein said flanges are formed with positioning projections.

4. The adapter as defined in claim 1, wherein said casing is provided with a partition wall extending from said front wall toward said open side, and an electrical part and said transformer are received in said casing with said partition wall intervening therebetween.

5. The adapter as defined in claim 4, wherein said partition wall has a support portion for mounting said electrical part thereon.

6. The adapter as defined in claim 1, wherein said L-shaped apertures have end surfaces for engaging said claws, said end surfaces being tapered in the fixing direction.

7. The adapter as defined in claim 1, further comprising a power cord inserting aperture formed in said casing, which aperture has a small lateral projection for engaging a power cord.

8. The adapter as defined in claim 1, wherein said lid pillar extends from said rear lid wall surface toward said open side relative to said screw inserting aperture which latter is in a casing pillar, so that upon temporary fixing of said lid, said lid pillar is positioned as an extension of said casing pillar.

9. The adapter as defined in claim 8, wherein opposed end surfaces of said casing pillar and of said lid pillar are respectively provided with small recesses and small mating projections.