Resources Contact Us Home
Method and tool for plugging a service connection in a gas main

Image Number 8 for United States Patent #6142166.

A tool and method for plugging a service connection to a gas main in preparation for removal of the service tee removes the perforator, mills the hole in the main to provide a smooth seat for a sealing plug, and inserts a gas-tight sealing plug into the hole. The tool of the invention is operable through a narrow "keyhole" excavation, which decreases the risk to service personnel and significantly reduces costs of repairing the excavation. In the preferred embodiment the tool is loaded with a milling bit and a sealing plug before attachment to the service tee. The tool head is engaged to the service tee in a gas-tight fit to prevent the escape of gas during the procedure, and an adapter plate is pivoted between three working positions to perform the three steps of the service connection plugging method. In the preferred embodiment a pneumatic gear motor drives a hexagonal driver bit actuated by a linear actuator located in the shaft of the tool, the driving bit providing the required mechanical interface with each of the accessories involved in each step of the procedure. A separate pneumatic motor pivots the adapter plate between working positions, and specialized adapter is provided at each working position of the adapter plate allowing the same actuators to be used for the perforator removal, milling and plugging operations.

  Recently Added Patents
Apparatus and sensor for adjusting vertical sensor-alignment
Differentiated PSIP table update interval technology
Hedge shear
DKK1 oncogene as therapeutic target for cancer and a diagnosing marker
Tri-material dual-species neutron spectrometer
Antenna support device
Low-staining room temperature curable coating composition
  Randomly Featured Patents
Rule creation method and rule creating apparatus
Digital image reading apparatus
Process for intermediates for the synthesis of LHRH antagonists
Aryl- and arylamino- substituted heterocycles as corticotropin releasing hormone antagonists
Rotatable gaming display interfaces and gaming terminals with a rotatable display interface
Programmable logic device multispeed I/O circuitry
Reduced profile drive assembly for garage door operator and method of assembly
Image acquiring device with positioning assisting functionality
Process for the production of shaped components of wood material, especially boards, bound with a hydraulic binder, preferably cement
Circuit for measuring the difference between two successive periods in a waveform