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Automatic orientation circuit indicator device for portable power tools and the like

  • US 4,189,726 A
  • Filed: 10/27/1977
  • Issued: 02/19/1980
  • Est. Priority Date: 10/27/1977
  • Status: Expired due to Term
First Claim
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1. An automatic orientation circuit indicator for portable power tools and the like, comprising in combination, a thin cylindrical case having opposing end walls for sealing the case and defining therewith an interior chamber, a thin-walled cylindrical ring member having opposing end faces, said ring member concentrically positioned against the inside of one end wall and extending into said chamber to form one electrical contact, a thin T-shaped member positioned against the inside of the other end wall, the center of said T-shaped member being coaxial with the center of the cylindrical case and the legs radially extending a distance at least equal to the radius of said cylindrical ring member, said T-shaped member forming another electrical contact, a spherical steel ball freely rotatable within said chamber capable of forming an electrical connection between the interiorly directed end face of the ring member and the remote ends of the legs of the T-shaped member when the indicator is in preselected positions, wiring respectively connected to each of said electrical contacts and extending outwardly through said case and connecting to an electrical circuit including a lamp and a power source.

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