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US 4,077,242 AGranted
Metal magnetic key
OwnerBruce S. Sedleyinventor
Life of this patent
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Abstract
A substantially indestructible magnetic card key having an exterior formed completely of metallic material such as stainless steel. In the preferred form, one side of the key is of magnetizable material and the other of nonmagnetizable material to enhance the operation of the key and simplify its encoding.
Claims4
A generally planar metal card key comprising:
- a pair of sheets of metallic material,
- a planar member of magnetizable material interposed between said sheets and coded with magnetic spots,
- means fixedly securing said sheets together along their peripheries and clamping said member between said sheets,
- one of said sheets being of nonmagnetizable material.
1 more element
A generally planar metal card key adapted for use with a lock which includes at least one locking pin adapted to be moved from a locking position to an unlocking position by a magnetic spot on such key when the latter is inserted in said lock,
- said key comprising:
- a pair of sheets of metallic material,
- a planar member of magnetizable material interposed between said sheets and coded with at least one magnetic spot in a predetermined location,
- means fixedly securing said sheets together along their peripheries and clamping said member between said sheets,
- one of said sheets being of magnetizable metal and the other of nonmagnetizable metal.
2 more elements
Dependencies are inferred from the claim text.