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US 4,145,587 AGranted
Snap action switches
AssigneeRanco Incorporated
InventorRobert F. Purssell
Life of this patent
Estimating the term…
Abstract
A snap action switch blade has a pair of resiliently flexible arms projecting cantilever fashion from a support and drawn together to prestress the blade for snap action, the blade being anchored to the support by two lugs projecting in the opposite direction to the arms and an electrical contact being mounted off-axis near one of the arms of the blade.
Claims14
A snap action switch blade comprising:
- a single piece of resilient sheet metal formed with a base portion, two longitudinally extending arms projecting in one direction from one side of the base portion, a central longitudinally extending tongue projecting from the same side of the base portion symmetrically between the two arms and having a free end disposed between the two arms, and two fixing lugs projecting from the opposite side of the base portion each lug supporting the blade in cantilever fashion;
- means interconnecting the ends of the two arms remote from the base portion and to predispose the blade for snap movement in response to the application of an operating force to the tongue, and a single contact carried at the ends of the arms remote from the base portion and located in a position spaced from the longitudinal axis of symmetry of the blade which passes through the tongue.
A snap action switch comprising:
- a switch blade of resilient sheet metal formed with a base portion, two longitudinally extending arms projecting in one direction from one side of the base portion, a central longitudinally extending tongue projecting from the same side of the base portion symmetrically between the arms, and having a free end between the two arms, and two lugs projecting outwardly from the opposite side of the base portion from the respective arms, said lugs individually effective to provide a cantilever support for said blade;
- means interconnecting the ends of the two arms remote from the base portion and beyond the free end of the tongue to induce dish stressing of the base portion;
- an electrical contact carried at the ends of the arms remote from the base portion;
- a support to which the two lugs of the blade are anchored and from which the blade projects cantilever-fashion;
- a fixed contact carried by the support and cooperating with said electrical contact carried by the switch blade, and
- an operating element acting upon the central tongue of the blade in a sense to cause snap transition thereof towards an opposite dish deformation to effect snap movement of the contact carried by the blade relative to the fixed contact.
3 more elements
Dependencies are inferred from the claim text.