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Apparatus for closing wrist straps

  • US 5,701,640 A
  • Filed: 11/06/1995
  • Issued: 12/30/1997
  • Est. Priority Date: 03/07/1994
  • Status: Expired due to Fees
First Claim
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1. A strap closure apparatus for wrist straps, in particular straps of wrist watches, said apparatus having a magnetic closure and an automatic mechanical lock for two closure parts and comprising at least one permanent magnet for providing magnetic force and a yoke forming part of a magnetic circuit, and a shield (6) comprising ferromagnetic material of comparatively high permeability substantially enclosing said magnetic circuit and being magnetically isolated from said magnetic circuit by air gaps (22, 23) and elements (14) whose permeability is lower than the permeability of the shield.

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