Resources Contact Us Home
Method and a device for deep hole drilling

Image Number 2 for United States Patent #4889194.

A device for drilling deep holes in the ground has at least two axial drill bits and an equal number of plates each having three shafts axially interconnecting the plates. Two of the shafts are rigidly attached to both plates and the third shaft is pivotably attached to both plates. The two rigid shafts are separable from the upper plate by pulling a locking pin separating a telescopic head of each shaft from the plate. At the separation, the shafts are telescopically shortened by springs and the drilling liquid is automatically shut off to the worn-out drill bit and opened to the new drill bit. The remaining third shaft eccentrically interconnects the plates, whereby the lower worn-out drill bit, at rotation, wears a semicircular evacuation pocket in the wall of the hole. The third shaft is successively pivoted outwards until it forms an angle of e.g. with the axis of the hole. An axle pin having rectangular cross-section retains the upper end of the third shaft via a sleeve with a slit. The slit has such a dimension that the narrowest cross-section of the axle pin can pass through the slit at said angle for releasing the third shaft from the second plate for placing the worn-out drill bit with three legs and plate in the evacuation pocket thus formed.

  Recently Added Patents
Methods and devices for enforcing network access control utilizing secure packet tagging
Refuelable battery-powered electric vehicle
2,2'-binaphthalene ester chiral dopants for cholesteric liquid crystal displays
Case for electronic device
Switching module and switching synchronization system
Estimating stack distances
Bluetooth headset
  Randomly Featured Patents
Composite gasket and fitting including same
Automobile tire
Method for pairwise sequencing of target polynucleotides
Imaging system
Garment hanger
Packaging system with hollow package and method for the same
System and method for informing network of terminal-based positioning method capabilities
Hay feeding apparatus
Multiple compartment multiple seal container
Toner image density detecting mechanism for image forming apparatus