Resources Contact Us Home
Earth boring system

Image Number 16 for United States Patent #7293615.

An earth boring apparatus for sinking shafts and removing shaft material from the shaft, the apparatus having at least two decks; hydraulic means for allowing movement of the decks relative to one another; releasable anchoring means associated with the decks for engaging walls of the shaft to secure the apparatus in a stationary position; whereby the releasable anchoring means of one of the decks engages the wall while the releasable anchoring means of the other deck is released from the wall to allow motion of the other deck along the shaft, in cooperation with the hydraulic means. The apparatus also includes guide means for forcing a bucket for hoisting shaft material from the shaft along a predetermined path, and an in-stage cut-boom drill.

  Recently Added Patents
Biological array holder
Tubing expansion
Smart web services security policy selection and validation
Combined floating point adder and subtractor
Protection circuit
Method and system for packet filtering for local host-management controller pass-through communication via network controller
Solid-state imaging device and method of manufacturing the same
  Randomly Featured Patents
Closing device for drawers
Foreign object insertion detector device
Reverse grip tricep push-down bar
Water heater cleaning apparatus
Sensitizers for photopolymerization
Sawhorse connector
Hydroponic irrigation system
High-assurance architecture for routing of information between networks of differing security level
Apparatus for use in the prophylaxis or treatment of tissue
Waterski sailboat