In the event that too much tension is pulled on the tool string while in the lubricator, the Model “B” Mechanical Head Catch will latch on to the fishing neck at the top of the string. If the wireline is pulled out of rope socket, the Head Catch will hold onto the fishing neck in the lubricator instead of letting the tool string fall down into the well.
Mounts in the bottom of the greasehead union
Uses stainless steel tensile screws to determine latch point of the head
Tensile screws can be added or deleted at 390 lbs each to calculate latch point.
Damper spring can exert 750 lbs of force to slow upward movement of the tool string.