×

Acoustic ear muff

  • US 4,944,361 A
  • Filed: 08/29/1988
  • Issued: 07/31/1990
  • Est. Priority Date: 09/02/1987
  • Status: Expired due to Term
First Claim
Patent Images

1. An acoustic ear muff including a pad or cup (2) made of a rigid material and incorporating an opening for accommodating an ear of a wearer, and a resilient sealing annulus (10) which is located around a defining edge of said opening and which is intended to be brought into abutment with a head of the wearer, and further includes spring pressure exerting means (5) connected to a shell of a protective helmet (1) or to a head strap, characterized in that the spring pressure-exerting means is configured to produce a low pressing force which is substantially independent of head sizes which vary within given limits and in that the pressure exerting means includes a spring element (5), said spring element comprising a pair of elongate leaf spring having legs spaced apart from one another, one end of each of said leaf spring legs being secured to said shell while the other end of each of said spring legs are biased towards one another in a plane of said springs so as to impart a given twist thereto.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×