Patent ID: 7754989

Claim:
An electrical switch comprising: a body; a fixed contact supported by the body; a moving contact bar slidably supported by the body for linear sliding within the body; a contact mounted on the contact bar and movable with the contact bar between a first position, in contact with the fixed contact, and a second position, out of contact with the fixed contact; a slider, partially disposed within the body, sliding linearly, substantially parallel to the moving contact bar, and including a first pin extending from the slider, transverse to the direction of sliding of the slider; a bracket linking the slider and the moving contact bar, sliding the moving contact bar in response to sliding of the slider, and including a second pin protruding from and transverse to the bracket and substantially parallel to the first pin; and a spring unit selectively resiliently biasing the moving contact toward the first position and toward the second position and including a helical spring having a linear central axis and opposed first and second ends, and first and second end pieces respectively attached to the first and second ends of the helical spring, each of the first and second end pieces including a stem coaxial with and frictionally engaging the helical spring at the respective end and a head covering the respective end of the helical spring, each head including a linear groove having an axis transverse to the central axis of the helical spring and extending diametrically across the head of the respective end piece, wherein the first pin is received within the groove of the first end piece for rotation of the first end piece relative to the first pin, and the second pin is received within the groove of the second end piece for rotation of the second end piece relative to the second pin.