Cassette screw bosses having ribbed surfaces

摘要

A videocassette housing includes a base connected to a cover. Cover bosses are received within respective base bosses, and the cover is connected to the base by fasteners passing through the base bosses and cover bosses. The cover bosses extend only slightly beyond the centerline of the cassette and seat at the bottom of the base bosses. There is very little clearance between the bosses and the base boss has an inner surface defined by a plurality of ribs axially and equiangularly located along a circle.