Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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. 80.degree. 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
Soybean cultivar CL0911610
Memory device having collaborative filtering to reduce noise
Efficient relay automatic repeat request procedure in broadband wireless access system
Cell reselection and handover with multimedia broadcast/multicast service
Bit error mitigation
System for purifying air through germicidal irradiation and method of manufacture
Image reading apparatus and image forming apparatus
  Randomly Featured Patents
Method and circuit arrangement for detecting short pulses of a digital input signal
Bath composition and method of electrodepositing utilizing the same
Polyurethanes and their use for the thickening of aqueous systems
Protectors
Headgear for cervical traction system
Process for calcining pulverulent material
Automobile tire
Method for genotyping microsatellite DNA markers
Magnetic deflection cathode ray tube system with electron gun having focus structure of a deposited resistive material
Method for preparing cupric ion-free cuprous chloride