Flexible well jar

Claim 1

IN A WELL JAR INNER AND OUTER TELESCOPINGLY ARRANGE TUBULAR PARTS MOVABLE LONGITUDINALLY RELATIVE TO EACH OTHER, MEANS FOR CONNECTING ONE OF SAID PARTS TO THE LOWER END OF AN UPPER SECTION OF A STRING OF WELL PIPE, MEANS FOR CONNECTING THE LOWER END OF THE OTHER PART TO THE UPPER END OF LOWER SECTION OF SAID STRING, SAID PARTS HAVING ELONGATED PORTIONS POSITIONED TO FORM AN ANNULAR FLUID CHAMBER BETWEEN THE PARTS, SEALING MEANS POSITIONED BETWEEN THE PARTS AT THE ENDS OF THE CHAMBER, SAID PARTS HAVING ELONGATED PORTIONS RADIALLY SPACED FROM EACH OTHER TO ALLOW RELATIVE LATERAL MOVEMENT BETWEEN THE PARTS AT A LOCATION EXTERNALLY OF THE CHAMBER, YIELDABLE MEANS BETWEEN THE PARTS AT SAID LOCATION POSITIONED FOR COACTION WITH THE PARTS TO YIELDINGLY RESIST SUCH RELATIVE LATERAL MOVEMENT, AND MEANS ON THE PARTS POSITIONED FOR COACTION UPON RELATIVE LONGITUDINAL MOVEMENT OF THE PARTS TO DELIVER A LONGITUDINAL IMPACT TO THE STRING.