| 摘要 |
A strap assembly for controlling the inward pressure on ear cups (14) mounted on a helmut (10). A rear strap (22) is rotatably secured to the helmut (10). At each end of the rear strap (22) are a pair of opposed buckles tabs (27). Each buckle defines a slot (36). The tabs (27) have a flexbile pawl (48) formed in a movable cover (44). There are a pair of opposed straps (60) having one end secured to the forward portion of the helmut. The other end of the strap (60) passes through the ear cups (14) and through the slots (36) in the buckle tabs. Each of the straps (60) has a ratchet track (64). When the straps (60) are moved toward one another to increase the inward pressure of the associated ear cups (14) the ratchet track slides under and displaces outwardly the pawl (48) in the tabs (27). Reversal movement of the strap (60) is prevented when the cover (44) is in its closed position. |
