Ear defenders for fastening to a protective helmet, in particular for forestry workers

Abstract

An ear protection to be fastened to a protective helmet, particularly for forestry workers, is described. The ear protection comprises two ear protectors each of which comprises a fork-like supporting bracket comprising ear protection capsule pivotably supported thereon and a rotary plate connected to the supporting bracket by a tilting joint in relation to which the supporting bracket can be bistably tilted into an extended and into a retracted position. The rotary plate is rotatably supported in a receiving part attached to the helmet. A yoke spring disposed between the rotary plate and the supporting bracket pre-stresses the supporting bracket to abut on stoppers defining the extended and the retracted position of the supporting bracket. The receiving part is attached to the inside of the helmet. The ear protectors are therefore rotatable into a parking position within the helmet.

1 . An ear protection to be fastened to a protective helmet comprising two ear protectors each of which comprises:
 a fork-like supporting bracket on which an ear protection capsule is pivotably supported,   a rotary plate jointedly connected to the supporting bracket in relation to which the supporting bracket can be bistably tilted into an extended and into a retreated position, and   a receiving part attachable or attached a to a helmet in which the rotary plate is rotatably supported and pivotable between a protecting position and a parking position defined by stoppers,   
       wherein the supporting bracket and the rotary plate are connected to each other by a tilting joint a tilting axis of which penetrates the supporting bracket and the rotary plate, 
       in that a yoke spring disposed adjacent to the tilting joint between the rotary plate and a free end of the supporting bracket pre-stresses the supporting bracket to abut on further stoppers defining the extended and the retracted position and ensures its bistable tiltability in this way, and 
       in that the receiving part is designed to be attached to the inside of a helmet. 
     
     
         2 . The ear protection according to  claim 1 , wherein an eccentric bolt rotatably disposed in the rotary plate and in contact with the yoke spring for adjusting the initial load applied to the supporting bracket by the yoke spring. 
     
     
         3 . The ear protection according to  claim 1 , wherein at the free end of the supporting bracket, a slide pre-stressed in the direction towards the rotary plate by a pressure spring is shiftably supported on an extension of the rotary plate which comprises a retaining lug which can be brought in contact with a slide path on the receiving part and is prevented from shifting by the supporting bracket in its retracted position and not prevented from shifting by the supporting bracket in its extended position and releasably retains the supporting bracket in its parking position by means of an engagement in a recess in the slide path of the receiving part. 
     
     
         4 . The ear protection according to  claim 1 , wherein by a groove which is formed in the receiving part and extends over at least a semi-circle for receiving a circular arc-shaped shoulder of the rotary plate. 
     
     
         5 . The ear protection according to  claim 4 , wherein a resilient tongue protruding from the receiving part for engaging in a complementary depression in the rotary plate for locking the mutual engagement of the receiving part and the rotary plate and for releasing the retainment by means of a push button disposed in the rotary plate.