Magnetic clasp for wristwatch strap
AssigneeTimex Corporation
InventorsNorman Sherman, Victor Shiff
Life of this patent
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Abstract
A strap for holding a wristwatch has a pair of separable flexible strap ends adapted to curve around the wrist and to overlap one another to provide an overlapped section. At least one strap end of thermoplastic material has particles of permanently magnetizable material embedded in the thermoplastic material and magnetized to provide rows of alternating magnetic poles. The strap ends have surfaces contacting one another throughout the overlapped section and mutually nesting uniformly spaced interlocking teeth, whereby the magnetized particles provide a holding force resisting separation of the strap ends, while the nested teeth prevent sliding disengagement movement between strap ends.
Claims10
An improved strap and clasp assembly comprising a strap having a pair of separable flexible strap ends adapted to curve around the wrist of a wearer and to overlap one another to provide an overlapped section, at least one of said strap ends including at least one ply of flexible thermoplastic material having embedded particles of permanently magnetizable material, said particles being magnetized to provide a first plurality of rows of alternating magnetic poles, the other of said strap ends including embedded particles of magnetizable material, said strap ends having surfaces contacting one another within said overlapped section, said contacting surfaces defining mutually nesting, uniformly spaced, protuberances and indentations, whereby said magnetized particles provide a holding force resisting separation of the strap ends, while said nesting protuberances and identations prevent sliding movement between strap ends.
Dependencies are inferred from the claim text.