Collapsible bobbin for wire or thread - has detachable flanges held to core by lugs wedged into position

摘要

The bobbin has a core(3)(4) made up from two halves located between two flanges(1, 2). The flanges have a central hole(8) and four rectangular slots. The edges of the core pieces are fitted with a rib (5) ending in a rectangular lug which fits through the rectangular slot in the flange. The lugs are held into position by the wedges (7) inserted behind the lugs.