Patents Assigned to Sigma Electric Manufacturing Corp.
  • Reducer bushing for weatherproof outlet boxes
    Patent number: 6992252
    Abstract: A removable reducer bushing is carried in a threaded port of an outlet box for coupling with a small threaded conduit and electively removable for coupling with a large threaded conduit thereby permitting a single box to handle multiple conduit sizes without separately procured parts. The bushing includes a deformable thread interruption resisting bushing rotation during removal of the small threaded conduit and frontal slots for manual removal of the bushing with a screwdriver against the resistance of the thread interruption.
    Type: Grant
    Filed: March 29, 2005
    Date of Patent: January 31, 2006
    Assignee: Sigma Electric Manufacturing Corp.
    Inventors: C. Gireesh Rao, David L. Scheer, Ashok Sathyanarayana Alilughatta
  • Compact ground clamp
    Patent number: 6976857
    Abstract: A ground clamp having upper and lower clamp members interconnected by clamping screws for mechanical and electrical connection with a grounding member, and a frontally projecting boss on the lower clamp member having a downwardly opening slot for receiving a ground wire which is retained by a set screw forward of the clamping screws whereby the various screws may be independently tightened without interference from adjacent screws.
    Type: Grant
    Filed: July 14, 2005
    Date of Patent: December 20, 2005
    Assignee: Sigma Electric Manufacturing Corp.
    Inventors: Shuklesh Shukla, Krishnan S. Iyer, Neville N. Kharas