Coil retaining case

• US 4,118,678 A
• Filed: 05/24/1977
• Issued: 10/03/1978
• Est. Priority Date: 12/22/1976
• Status: Expired due to Term

• Current Assignee: TDK Corporation
• Original Assignee: TDK Electronics (TDK Corporation)
• Inventors: Osada, Hisashi, Goshima, Yoshio
• Primary Examiner(s): Smith, Alfred E.
• Assistant Examiner(s): Nussbaum, Marvin
• Application Number:
  US05/799,998
• Time in Patent Office: 497 Days
• Field of Search: 333/70 R, 333/70 S, 333/77, 333/78, 333/29, 336/65, 336/68, 336/90, 336/92, 336/96, 336/199, 336/205, 336/208, 336/209, 336/210, 336/211, 174/45, 174/46, 174/52 R, 174/52 PE, 174/52 S, 174/50
• US Class Current: 333/185
• CPC Class Codes: H01F 27/027 specially adapted for combination of signal type inductors or transformers with electronic circuits, e.g. mounting on printed circuit boards

Abstract

An electronic part comprises a plastic core holder having a sectional ] shape which has an opening part and a stopper in one side and a bottom; and a plurality of drum cores having windings which are arranged in the core holder to contact the flanges of the adjacent drum cores.

Claims

1. An electronic part comprising:

a plastic core holder having a rectangular bottom wall, a pair of side walls appending at right angles from opposite lengthwise edges of said bottom wall, one of said side walls having a core retaining wall appending therefrom and extending toward the other of said side walls, and an end blocking wall appending at a right angle from a widthwise edge of said bottom wall, wherein said bottom wall, said side walls, said core retaining wall and said blocking wall are formed integrally of a plastic material and define an end access opening opposite said end blocking wall, and a side access opening between said other of said side walls and said retaining wall; and

a plurality of drum cores, each having top and bottom flanges separated by a cylindrical body section, and windings wrapped around said body section, said drum cores disposed in said core holder through said end access opening with said flanges of adjacent cores contacting each other and said bottom wall, said side walls, and said retaining wall such that said drum cores are maintained in precise position within said holder, and said entire body section and said windings of said cores are completely visible and accessible through said side access opening, said drum cores bonded and sealed in said core holder at said end opening after disposition therein such that said drum cores are securely retained in said holder;

whereby the electrical coupling of adjacent cores are controlled as a result of the precise positioning of said cores within said holder, and electrical connection is made to said windings completely visible and accessible through said side access opening.

2. An electronic part according to claim 1, wherein the windings wound on each drum core have a distinct color.