Hydraulically operated well pipe extracting apparatus

Claim 1

APPARATUS FOR EXTRACTING A LINEAR BODY FROM THE GROUND INCLUDING, IN COMBINATION, A BASE, CYLINDER MEANS MOUNTED ON THE BASE, PISTON MEANS RECIPROCABLE IN SAID CYLINDER MEANS, A BODY EXTRACTING HEAD SUPPORTED BY THE PISTON MEANS, A BODY GRIPPING ELEMENTS CARRIED BY THE EXTRACTING HEAD HAVING LATERALLY PROJECTING TRUNNIONS, SAID HEAD BEING PROVIDED WITH CONVERGINGLY ARRANGED GUIDE SURFACES, SAID TRUNNIONS ENGAGING THE GUIDE SURFACES TO BIAS THE GRIPPING ELEMENTS INTO ENGAGEMENT WITH A BODY TO BE EXTRACTED UPON UPWARD MOVEMENT OF THE EXTRACTING HEAD RELATIVE TO A LINEAR BODY, PASSAGE MEANS FOR CONVEYING FLUID INTO AND AWAY FROM THE CYLINDER MEANS, EACH OF SAID BODY GRIPPING ELEMENTS BEING FORMED WITH A PLURALITY OF BODY ENGAGING REGIONS, EACH OF SAID BODY ENGAGING REGIONS OF EACH OF THE GRIPPING ELEMENTS BEING AT A DIFFERENT DISTANCE FROM THE TRUNNIONS OF EACH SAID ELEMENTS TO ACCOMMODATE LINEAR BODIES OF VARYING SIZES, SAID BODY ENGAGING REGIONS OF THE GRIPPING ELEMENTS BEING FASHIONED WITH A PLURALITY OF TEETH OF ARCUATE CONFIGURATION FOR ENGAGEMENT AND GRIP THE BODY UPON UPWARD MOVEMENT OF THE ENGAGE AND GRIP THE BODY UPON UPWARD MOVEMENT OF THE EXTRACTING HEAD RELATIVE TO A LINEAR BODY.