Patent ID: 7281575

Claim:
A method of dislodging down-hole equipment from a well-bore, comprising: coupling an impact jar to the down-hole equipment, the impact jar including: an impactor coupled to a tensioning device; an impactee slidably coupled to the impactor and coupled to the down-hole equipment, the impactee having a plurality of flexible coupling fingers; and a biasable member detachably engaged by the plurality of flexible coupling fingers in a pre-impact position and configured to disengage the plurality of flexible coupling fingers in response to a tensile force applied by the tensioning device reaching a predetermined quantity, wherein the impactor and impactee are configured to impact in response to the disengagement of the biasable member and the plurality of flexible coupling fingers; operating the tensioning device to increase the tensile force towards the predetermined quantity; and reducing the tensile force applied by the tensioning device after the biasable member and the impactee disengage.