Electric noise absorber

• US 4,885,559 A
• Filed: 06/06/1988
• Issued: 12/05/1989
• Est. Priority Date: 08/29/1986
• Status: Expired due to Term

• Current Assignee: Kitagawa Industries Company Limited
• Original Assignee: Kitagawa Industries Company Limited
• Inventors: Nakano, Yoshihito
• Primary Examiner(s): Kozma, Thomas J.
• Application Number:
  US07/205,578
• Time in Patent Office: 547 Days
• Field of Search: 324/127, 174/92, 333/81 R, 333/12, 333/182, 333/243, 333/183, 336/174, 336/233, 336/175, 336/176, 336/92, 336/229, 336/212, 336/210, 336/90, 335/303, 335/285, 335/299
• US Class Current: 336/92
• CPC Class Codes: H01F 17/06 with core substantially closed in itself, e.g. toroid
• CPC Class Codes: H01F 2017/065 Core mounted around conductor to absorb noise, e.g. EMI filter
• 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
• CPC Class Codes: H01F 27/33 Arrangements for noise damping
• CPC Class Codes: H03H 1/0007 of radio frequency interference filters
• CPC Class Codes: H03H 2001/0028 RFI filters with housing divided in two bodies
• CPC Class Codes: H04B 15/00 Suppression or limitation of noise or interference by means associated with receiver H04B1/10

Abstract

An electric noise absorber for clamping to a cord of an electronic device comprises a holding case composed of two box-shaped case members. Each case member contains a magnet having a hemi-cylindrical groove at the upper part of the magnet for receiving the cord. It is possible to easily and securely attach and detach the electric noise absorbing magnet to the cord by simply closing and opening the case members.

Claims

1. An electric noise absorber for surrounding a cord of an electronic device comprising:

two bodies of magnetic substance, each having a hemi-cylindrical groove for receiving the cord;

two case members for covering the cord when interlocked, each case member containing one said body; and

means for selectively interlocking said case members such that said bodies surround said cord,

wherein each said body has side grooves and each said case member has flexible projections for securing the body in the case member by engaging with the side grooves.

2. The electric noise absorber according to claim 1, wherein the two case members form halves of one body and are connected by a hinge and each said case member has means for engaging with the other such that the case members clamp around the cord.

3. The electric noise absorber according to claim 2, wherein:

each said case member is box-shaped with one open surface;

the hinge is formed along a longitudinal edge of the open surface;

the engaging means are formed on another longitudinal edge of the open surface;

a semi-hole is formed on each of narrow edges of the open surface for passing the cord; and

teeth are formed on an edge of each of the hemi-holes for securing the cord when the cases are closed.

4. The electronic noise absorber according to claim 3, wherein each said case member has biasing means on a surface opposite to the open surface for biasing the body to the cord when the case members are closed.

5. The electric noise absorber according to claim 4, wherein one of the case members has a hook projecting outside of the case member on the surface opposite to the open surface for securing a case to a circuit board.

6. The electric noise absorber according to claim 1, wherein the two case members are formed separately and same to each other and said each case member has means for engaging with each other such that the case members clamp around the cord.

7. The electric noise absorber according to claim 6, wherein:

said each case member is box-shaped with one open surface;

the engaging means are formed along a longitudinal edge of the open surface;

a hemi-hole is formed on each of narrow edges of the open surface for passing the cord; and

teeth are formed on an edge of each of the hemi-holes for securing the cord when the case members are closed.

8. The electric noise absorber according to claim 7, wherein each said body has side grooves and each case member has flexible projections for securing the body in the case member by engaging with the side grooves.

9. The electric noise absorber according to claim 8, wherein said each case member has biasing means on a surface opposite to the open surface for biasing the body to the cord when the case members are closed.

10. The electric noise absorber according to claim 9, wherein one of the case members has a hook projecting outside of the case member on the surface opposite to the open surface for securing the case to a circuit board.