Electromagnetic pulse rotary seal

• US 4,807,891 A
• Filed: 07/06/1987
• Issued: 02/28/1989
• Est. Priority Date: 07/06/1987
• Status: Expired due to Fees

• Current Assignee: The United States of America As Represented By The Secretary of Agriculture
• Original Assignee: United States Of America As Represented By The Secretary Of The Air Force
• Inventors: Neher, Clarence W.
• Primary Examiner(s): Shoap, Allan N.
• Application Number:
  US07/069,999
• Time in Patent Office: 603 Days
• Field of Search: 277/80, 277/1, 277/901, 277/212 FB, 277/89, 277/90, 277/96.2, 277/95, 174/35 GC, 174/35 C
• US Class Current: 277/392
• CPC Class Codes: F16J 15/3456 without external means for pressing the ring against the face, e.g. slip-ring with a resilient lip
• CPC Class Codes: H05K 9/0015 Gaskets or seals
• CPC Class Codes: Y10S 277/92 Seal including electromagnetic shielding feature
• CPC Class Codes: Y10S 277/935 Seal made of a particular material

Abstract

An rotary seal for protection against electromagnetic interference and electromagnetic pulses is disclosed. An electrically conductive resilient bellows surrounds a shaft extending through an opening in an enclosure. The bellows is attached at one end to the shaft and biased against the enclosure at the other end. The attachment of the bellows to the shaft includes a static electromagnetic seal.

Claims

1. An electromagnetic pulse rotary seal for a shaft extending through an opening in an enclosure, comprising an electromagnetically conductive resilient bellows surrounding the shaft outside the enclosure opening, the bellows having a first open end attached to the shaft, a second open end biased against the enclosure around the enclosure opening, and wherein the bellows has a passivated surface area in contact with the enclosure for reducing electromagnetic leakage past said surface area.

2. An electromagnetic pulse rotary seal for a shaft extending through an opening in an enclosure, comprising an electromagnetically conductive resilient bellows surrounding the shaft outside the enclosure opening, the bellows having a first open end attached to the shaft, a second open end biased against the enclosure around the enclosure opening, and wherein the enclosure has a passivated surface area in contact with the bellows for reducing electromagnetic leakage past said surface area.