Patent ID: 8561688

Claim:
A jar having a longitudinal axis, the jar comprising: a first housing member including a release collet comprising a plurality of circumferentially spaced finger members, each finger member having a radially inner surface comprising a plurality of axially spaced tabs; a second housing member coupled to the first housing member; a mandrel extending through the first housing member and into the second housing member, wherein the mandrel has a hammer surface configured to impact an anvil surface in the second housing member; and a collet sleeve mounted to the mandrel and radially positioned between the mandrel and the finger members, wherein the collet sleeve has a radially outer surface comprising a plurality of axially spaced grooves configured to releasably engage the tabs; wherein each finger member has a first position with the tabs radially withdrawn from the grooves and a second position with the tabs radially advanced into the grooves; wherein the second housing member is configured to move axially relative to the first housing member in response to the finger members transitioning from the first position to the second position.