Patent ID: 8443467
Filing Date: 2013-05-21
Classification: A61F

Abstract:
1. An earmuff assembly, comprising: a headband consisting of two reversed headband elements, each said headband element comprising two constraint lugs bilaterally located on one end thereof, an insertion groove defined in each said constraint lug, a coupling portion located on an opposite end thereof, and two sliding grooves bilaterally extending along the length between the two opposite ends thereof, said coupling portion having two chamfered edges bilaterally located on a distal end thereof and a through hole spaced between said two chamfered edges, the coupling portion of one of said two headband elements being inserted through the insertion grooves of the constraint lugs of the other of said two headband elements to have the respective sliding grooves of one of said two headband elements be relatively slidably coupled to the respective insertion grooves of the other of said two headband elements, each said headband element having a thickness gradually increasing in direction from the constraint lugs toward the coupling portion; two ear cups, each said ear cup comprising an elongated base frame, a rim, an insertion hole cut through two distal ends of said elongated base frame, a plurality of locating holes transversely formed in said elongated base frame across said insertion hole, a stop block located on one end of said insertion hole near the center of the respective ear cup, a plurality of ribs extending in transverse and radial directions and connected with one another between said base frame and said rim, a rounded accommodation space surrounded by said rim and said ribs, and a straight cutting edge located on the periphery of said rim adjacent to one end of said insertion hole and remote from said stop block; two connection devices adapted for connecting said ear cups to said headband elements of said headband, each said connection device comprising a substantially U-shaped connection plate, an elongated connection strip and a pivot member, said U-shaped connection plate comprising a flat positioning space defined between two parallel ends thereof for receiving the coupling portion of one said headband element, a pivot hole cut through each of said two parallel ends across said flat positioning space, said pivot member pivotally connecting the pivot hole on each of the two parallel ends of said U-shaped connection plate to the through hole of the coupling portion of one said headband element, a round rod groove transversely located on a middle part of said U-shaped connection plate inside said positioning space, and an insertion slot cut through the middle part, said elongated connection strip comprising a strip body inserted through the insertion slot of said U-shaped connection plate, a round rod transversely located on and formed integral with one end of said strip body and pivotally positioned in the round rod groove of said U-shaped connection plate, and a plurality of locating teeth transversely located on and spaced along each of two opposite sides of said strip body remote from said round rod and selectively engaged with the locating holes of the elongated base frame of one said ear cup; and soft fabric cover means covering at least each of said two ear cups.