Method and apparatus for observing, indicating and maintaining fluid level
Well drilling tool with lubricant level indicator Patent #: 4114702
ApplicationNo. 06/168504 filed on 07/14/1980
US Classes:411/373, Attachable cap structure116/270, Flexible indicator184/103.1, Constant level184/109, MISCELLANEOUS411/431, Resiliently retained411/910ANTITAMPER MEANS
ExaminersPrimary: Britts, Ramon S.
Attorney, Agent or Firm
International ClassesF16B 37/14 (20060101)
F16B 37/00 (20060101)
F16B 1/00 (20060101)
AbstractMethods and apparatus are provided for protecting nuts and protruding threads of bolts from corrosion and damage. A cup-shaped cap is provided for sealingly enclosing the exposed threads. A suitable protecting fluid may be introduced through a charging port, and an expandable bladder protruding from the side of the cap indicates that the cap is maintaining the protective fluid under pressure. A nut cover is slidably mounted to the cap, and serves to protect the nut from the environment.