Earmuff assembly

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.

2. The earmuff assembly as claimed in claim 1 , wherein the through hole of the coupling portion of each said headband element is pivotally connected to the pivot hole on each of the two parallel ends of the U-shaped connection plate of the respective connection device by the respective pivot member such that each said ear cup is biasable with the U-shaped connection plate of the respective connection device relative to said headband horizontally (in X-axis direction) to any one of 90°, 0° and 180° positions.

3. The earmuff assembly as claimed in claim 1 , wherein said chamfered edges of said coupling portion of each said headband element are so made that each said ear cup is biasable with the U-shaped connection plate of the respective connection device relative to said headband horizontally (in X-axis direction) to any one of 90°, 0° and 180° positions.

4. The earmuff assembly as claimed in claim 1 , wherein the connection arrangement between the round rod of each said connection device and the round rod groove of the associating U-shaped connection plate enables each said ear cup to be biased with the elongated connection strip of the respective connection device relative to said headband vertically (in Y-axis direction).

5. The earmuff assembly as claimed in claim 1 , wherein each transversely extending locating tooth of the elongated connection strip of each said connection device comprises a beveled guide face located on a front side thereof and a vertical stop edge located on a rear side thereof.

6. The earmuff assembly as claimed in claim 1 , wherein each said ear cup further comprises a plurality of plug holes defined in between said rim and said ribs and disposed adjacent to said straight cutting edge.

7. The earmuff assembly as claimed in claim 1 , wherein each said ear cup further comprises a plurality of plug holes defined in between said rim and said ribs and disposed remote from said straight cutting edge.

8. The earmuff assembly as claimed in claim 1 , wherein said soft fabric cover means comprises two soft fabric coverings, each said soft fabric covering comprising two pieces of soft fabric material respectively attached to one said ear cup and peripherally stitched together at the edges and a finding tape seamed to the stitched peripheral edges of said two pieces of soft fabric material.

9. The earmuff assembly as claimed in claim 1 , wherein said soft fabric cover means comprises two soft fabric coverings, each said soft fabric covering comprising two pieces of soft fabric material peripherally stitched together to form a pocket having an opening for the insertion of one said ear cup.

10. The earmuff assembly as claimed in claim 1 , wherein said soft fabric cover means is a single piece member covering said two ear cups, said headband and said two connection devices.