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
Phone messaging using audio streams
Architectural panel with millet and grass
Location estimation of wireless terminals through pattern matching of deduced signal strengths
Lead frame array package with flip chip die attach
Method and apparatus for an active low power mode of a portable computing device
Method and system for establishing enhanced key when terminal moves to enhanced universal terminal radio access network (UTRAN)
Horizontal card holder
  Randomly Featured Patents
Color image processing device and color image processing method
Pet toy
Filter plate, filter plate element, and filter comprising same
Air pump
Modular dental chair equipment mounting system
Treatment of polyvinylchloride
Knife system
Passive remote loop-back method and apparatus for optical circuit verification
7.beta.-Arylalkyl-6.alpha., 7 .alpha.-oxymethylene-3-methoxy or 3-hydroxy-4, 5.alpha.-epoxy-17 methyl or 17-cycloalkyl-methyl morphinans
Stabilization of color in heated electroluminescent phosphor