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
Bicyclic azaheterocyclic carboxamides
Extreme ultraviolet light source device and method for generating extreme ultraviolet light
Visually tracking an object in real world using 2D appearance and multicue depth estimations
Liquid crystal display and method of driving the same
Motor vehicle, toy and/or replica
Braided boomerang pet toy
Preparation and use of meristematic cells belonging to the Dendrobium phalaenopsis, Ansellia, Polyrrhiza, Vanilla, Cattleya and Vanda genera with high content of phenylpropanoids, hydrosoluble
  Randomly Featured Patents
Distributor for improved water therapy
Orthopedic sitting device
Perforating device of stamp unit
Setup condition recorder for a color scanner
Sectional door operator alignment method
Nonvolatile semiconductor memory with a source line potential level detection circuit
Method for measuring the yaw velocity of a vehicle
Child safety device for looped cords
Electronic still camera for converting and recording still image signal into a plurality of streams
Solid state lighting package structure