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Rolling-ball switch

  • US 7,465,893 B2
  • Filed: 12/04/2006
  • Issued: 12/16/2008
  • Est. Priority Date: 09/29/2006
  • Status: Expired due to Fees
First Claim
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1. A rolling-ball switch comprising:

  • an insulative housing having an outer surface, a tubular wall that has an axial hole and two opposite open-end portions, each of said open-end portions having an end face and a retaining portion, said retaining portion having an annular engaging groove formed in an inner wall face of said tubular wall;

    two lead terminals covering respectively said open-end portions, each of said lead terminals being a one-piece conductive body and being provided with an engaging portion; and

    a ball unit disposed rollably in said axial hole to contact said lead terminals;

    wherein each of said lead terminals includes an insert portion disposed in said axial hole, and an end cap portion extending outwardly of the respective one of said open-end portions and abutting against said end face, said engaging portion having an annular protrusion formed on an outer surface of said insert portion to engage said annular engaging groove;

    wherein said outer surface of said insert portion is further formed with a plurality of axial ribs to contact frictionally said inner wall face of said tubular wall, an annular receiving groove adjacent to said end cap portion, and a sealing gasket disposed in said annular receiving groove; and

    wherein said outer surface of said insulative housing has a middle portion higher than portions at two opposite sides of said middle portion.

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