| 摘要 |
The subject invention includes a plurality of projections ( 46 ) for sandwiching fabric ( 42 ) between inner and outer members ( 22, 24 ). Each of the projections ( 46 ) extends laterally from the inner member ( 22 ) to a distal rim ( 48 ) and defines a hollow passageway ( 50 ). The outer member ( 24 ) defines a plurality of circular holes ( 58 ) having a hole diameter (E) for receiving the projections ( 46 ) and maintaining the members ( 22, 24 ) in a clamping engagement with the fabric ( 42 ). The projections ( 46 ) define a cylindrical exterior surface ( 54 ) extending from the inner member ( 22 ) and having an outer diameter (B). A nipple ridge ( 56 ) projects radially from the exterior surface ( 54 ) of each of the projections ( 46 ) to a ridge diameter (A), which is larger than the outer diameter (B) and snaps into a recessed shelf ( 62 ) disposed about the holes ( 58 ) on the outer member ( 24 ) retain the projections ( 46 ) in the holes ( 58 ).
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