公开(公告)号：US3617977A

公开(公告)日：1971-11-02

申请号：US3617977D

申请日：1969-09-05

Applicant: BUNKER RAMO

Inventor： SCHEITERBAUER ADOLF K ,  STICKDORN HELMUT

IPC: H01C1/022 ,  H01C10/32 ,  H01C9/02 ,  H01C5/02

CPC classification number: H01C10/32 ,  H01C1/022 ,  Y10S338/01

Abstract: Electrical device having snap together housing parts, one part having a cylindrical outside surface formed with an annular projection to snap into an annular groove of a cylindrical inside surface of the other part. The projection and the groove have rounded cross-sectional shapes and the radius of curvature of the projection is greater than that of the groove, providing restricted areas interengaged with a high unit pressure to provide an effective seal. Impedance means are provided on one part in the form of an annular resistance element engaged by a wiper contact rotatable about the axis of the cylindrical surfaces and connected to a worm gear which is engaged by a worm on the other part when the parts are assembled.