CLAMPING UNIT FOR BOREHOLE TRANSDUCERS OF ELASTIC VIBRATIONS Russian patent published in 1997 - IPC

FIELD: borehole seisometry. SUBSTANCE: clamping unit has central rod 1 with head 2 and tail part 3 and pressing mechanism mounted on it which includes upper and lower mobile couplings 4 and 5 spring-loaded in axial direction by spiral compression springs 6 and 7. One of them is rigidly fixed on head, while the other, on tail part. Counter movement of couplings along rod under action of springs is limited by rests 8 and 9 positioned on it. Couplings are hinged with the aid of system of levers 10 and 11 to transducers 12. Plate-shaped couplings are fitted with holes 13 and 14 for overflow of drilling fluid with movement of unit along borehole and are made from reinforced rubber. EFFECT: generation of seismic recordings undistorted by cable waves within wide range of change of borehole diameter; reliable protection of transducers against mechanical injuries. 3 dwg