Rotary shock absorbing sub unit

Claim 1

A SHOCK ABSORBING SUB UNIT ADAPTED TO BE COUPLED IN THE DRILL STRING OF A ROTARY EARTH-BORING DRILL FOR ABSORBING VIBRATIONS CREATED BY THE BIT DURING DRILLING OPERATIONS SO AS TO PREVENT THEM FROM BEING TRANSMITTED TO THE DRILL STRING, COMPRISING AN INNER DRIVEN OPEN ENDED HOLLOW MANDREL CONNECTIBLE AT ITS BOTTOM END TO THE BIT, AN OUTER OPEN-ENDED HOLLOW MANDREL IN COAXIAL SURROUNDING RELATION TO THE INNER MANDREL HAVING A VERTICAL SLIDABLE RELATION TO THE INNER MANDREL AND CONNECTIBLE AT ITS TOP END TO THE DRILL STRING, SHOCK ABSORBING MEANS SLIDABLY DISPOSED BETWEEN THE INNER AND OUTER MANDRELS PROVIDING ALTERNATELY ARRANGED COMPRESSIBLE RESILIENT MEMBERS AND PRESSURE TRANSMITTING MEMBERS IN SLEEVED RELATION TO THE INNER MANDREL AND SUPPORTING THE OUTER MANDREL UPON THE INNER MANDREL, A SHOULDER ON THE INNER MADREL DEFINING A SEAT FOR ONE END OF THE SHOCK ABSORBING MEANS, AN OPPOSED SHOULDER INTERNALLY OF THE OUTER MANDREL SEATED UPON THE OPPOSITE END OF THE SHOCK ABSORBING MEANS, THE INTERIOR OF THE INNER MANDREL PROVIDING A FLUID PASSAGE TO THE BIT, A PIPE IN THE OUTER MANDREL PROVIDING A FLUID PASSAGE FROM THE DRILL STRING, A SLEEVE SECURED TO THE INNER MANDREL AT ONE END HAVING A SLIDABLE CONNECTION AT ITS OTHER WITH THE PIPE PROVIDING COMMUNICATION OF THE FLUID PASSAGES WITH ONE ANOTHER AND ALLOWING SLIDABLE AXIAL MOVEMENT OF THE INNER MANDREL RELATIVE TO THE PIPE, MEANS SEALING THE SLEEVE RELATIVE TO THE OUTER MANDREL AND THE PIPE AGAINST LEAKAGE OF FLUID AROUND THE PIPE AND SLEEVE TO THE SHOCK ABSORBING MEANS, AND MEANS INDEPENDENT OF THE SHOCK ABSORBING MEANS FORMING A SOLE DRIVING CONNECTION BETWEEN THE OUTER AND INNER MANDRELS FOR TRANSMITTING TORQUE OF THE OUTER MANDREL TO THE INNER MANDREL.