Cutlery – Cutting tools – Plural cooperating blades
Patent
1993-05-14
1995-05-30
Seidel, Richard K.
Cutlery
Cutting tools
Plural cooperating blades
30350, 76119, B26B 1700
Patent
active
054190479
ABSTRACT:
Plier-type cutters for cutting metal objects having a pair of plier halves which are each of one piece construction and made of a hardenable stainless steel. Each plier half has a cutting edge hardened to a cutting hardness suitable for cutting the metal object, such as an orthodontic metal appliance, without fracturing during normal use. Each plier half has at least one fracture sensitive portion, excluding its cutting edge, which would be susceptible to fracturing during normal use if hardened to the cutting hardness. Each fracture sensitive portion has a working hardness which is sufficiently lower than the cutting hardness to substantially limit, if not eliminate, the likelihood of fracture during normal use. The present plier-type cutters with differently hardened regions may be obtained by fully hardening each plier half to the desired cutting hardness and then selectively tempering at least the fracture sensitive portions of each while keeping at least the cutting edges relatively cool to prevent significant softening thereof.
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Ormco Corporation
Seidel Richard K.
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