Tamper resistant plug
AssigneeS&C Electric Company
InventorsEliseo Navarrete, Lawrence S. Semel, James F. Fargo, Rahul Jain
Life of this patent
Estimating the term…
Abstract
A tamper resistant plug that has particular application for sealing a fill port in a hermetically sealed and gas-insulated tank associated with medium-voltage switchgear. The plug includes a body portion and a top annular rim defining a central recess and having an internal surface facing the recess, where the internal surface has a polygon shape with only rounded edges. In one embodiment, the polygon shape is a trilobe.
Claims20
A plug for sealing a fill port in a tank, the plug comprising:
- a body portion;
- and
- a top annular rim defining a central recess, the rim having an internal surface facing the recess, the internal surface having a polygon shape with only rounded edges.
A plug for sealing a fill port in a tank, the plug comprising:
- a body portion;
- and
- a top annular rim defining a central recess, the rim having an internal surface facing the recess, the internal surface having a polygon shape with no corners.
Switchgear including a hermetically sealed tank having a fill port and a plug for sealing the fill port, the plug comprising:
- a body portion;
- and
- a top annular rim defining a central recess, the rim having an internal surface facing the recess, the internal surface having a polygon shape with only rounded edges.
Dependencies are inferred from the claim text.