| 摘要 |
A VENTING DEVICE (28) FOR A DRUM (10). THE VENTING DEVICE (28) INCLUDES A BODY (30) HAVING A PAIR OF OPPOSING SIDES AND DEFINING A PLURALITY OF VENT PASSAGES. THE VENT PASSAGES EXTEND THROUGH THE BODY AND EACH AN OPENING OF EACH OF THE PAIR OF OPPOSING SIDES. THE VENT PASSAGES ARE SPACED APART AND ARRANGED AROUND A CENTER PORTION OF THE BODY. A MEMBRANE STRUCTURE (74) IS POSITIONED SO AS TO COVER THE OPENINGS OF THE VENT PASSAGES ON ONE OF THE PAIR OF OPPOSING SIDES OF THE BODY. THE MEMBRANE STRUCTURE IS SEALINGLY AFFIXED TO THE BODY PORTION IN A SEALING BAND (80) SURROUNDING THE OPENING OF THE VENT PASSAGES. A PORTION OF THE MEMBRANE STRUCTURE IS FURTHER AFFIXED TO THE CENTER PORTION OF THE BODY. A PROTECTIVE STRUCTURE MAY BE ATTACHED TO THE BODY AND POSITIONED OVER THE MEMBRANE STRUCTURE.FIG. 1
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