Apparatus for recovering objects in a well

Claim 2

IN AN APPARATUS FOR RECOVERY OF OBJECTS LODGED IN A WELL THE IMPROVEMENT COMPRISING, AN ELONGATED WASHOVER PIPE ADAPTED TO BE MOVED IN A WELL, AN ELONGATED MANDREL IN SAID WASHOVER PIPE, ENGAGING MEANS CONNECTED TO THE LOWER END OF THE MANDREL ADAPTED TO ENGAGED THE OBJECT IN THE WELL, SAID MANDREL INCLUDING AN ENLARGED DIAMETER PORTION, RELEASABLE CONNECTING MEANS RELEASABLY SECURING THE MANDREL IN THE WASHOVER PIPE, A FIRST J-SLOT IN THE ENLARGED DIAMETER PORTION OF THE MANDREL BELOW ITS UPPER END, A LUG ON THE INNER WALL OF THE WASHOVER PIPE ADAPTED TO BE SLIDABLY RECEIVED IN SAID FIRST J-SLOT, A SECOND J-SLOT IN THE MANDREL BELOW THE ENLARGED DIAMETER PORTION OF SAID MANDREL, AND A LUG CONNECTED TO SAID ENGAGING MEANS AND ADAPTED TO BE SLIDABLY RECEIVED IN SAID SECOND J-SLOT, AND SHEARABLE MEANS RELEASABLY SECURING THE ENGAGING MEANS TO THE MANDREL.

Claim 3

IN AN APPARATUS FOR RECOVERY OF OBJECTS IN A WELL BORE, SAID APPARATUS INCLUDING A WASHOVER PIPE, A MANDREL MOVABLE IN THE WASHOVER PIPE, AND ENGAGING MEANS CONNECTED TO THE LOWER END OF THE MANDREL ADAPTED TO ENGAGE THE OBJECT IN THE WELL, THE IMPROVEMENT COMPRISING, AN OPEN ENDED CYLINDER AT THE UPPER END OF THE MANDREL, A PISTON SLIDABLY MOUNTED IN THE CYLINDER, A SLIP ASSEMBLY SLIDABLY SECURED TO THE MANDREL, SAID SLIP ASSEMBLY INCLUDING SLIPS, SAID MANDREL INCLUDING A VERTICAL SLOT ADJACENT THE SLIP ASSEMBLY, SAID MANDREL BEING TAPERED ADJACENT ITS UPPER END TO FORM A SLIP EXPANDER ADAPTED TO EXPAND THE SLIPS INTO ENGAGEMENT WITH THE WASHOVER PIPE UPON RELATIVE MOVEMENT OF THE SLIPS TOWARDS THE SLIP EXPANDER AND TO RELEASE THE SLIPS UPON RELATIVE MOVEMENT OF THE SLIPS AWAY FROM THE SLIP EXPANDER, SPRING MEANS URGING THE SLIP ASSEMBLY TOWARD THE SLIP EXPANDER, A RIGID CONNECTION SECURED BETWEEN THE PISTON AND THE SLIP ASSEMBLY THROUGH THE VERTICAL SLOT WHEREBY ON APPLICATION OF FLUID PRESSURE ON THE PISTON THE SLIP ASSEMBLY IS MOVED IN ONE DIRECTION RETRACTING THE SLIPS.

Claim 4

IN AN APPARATUS FOR RECOVERY OF OBJECTS IN A WELL BORE, SAID APPARATUS INCLUDING A WASHOVER PIPE, A MANDREL MOVABLE IN THE WASHOVER PIPE, AND ENGAGING MEANS CONNECTED TO THE LOWER END OF THE MANDREL ADAPTED TO ENGAGE THE OBJECT IN THE WELL, THE IMPROVEMENT COMPRISING, AN OPEN ENDED CYLINDER AT THE UPPER END OF THE MANDREL, A PISTON SLIDABLY MOUNTED IN THE CYLINDER, A SLIP ASSEMBLY SLIDABLY SECURED TO THE MANDREL, SAID SLIP ASSEMBLY INCLUDING SLIPS, SAID MANDREL INCLUDING A VERTICAL SLOT ADJACENT THE SLIP ASSEMBLY, SAID MANDREL BEING TAPERED ADJACENT ITS UPPER END TO FORM A SLIP EXPANDER ADAPTED TO EXPAND THE SLIPS INTO ENGAGEMENT WITH THE WASHOVER PIPE UPON RELATIVE MOVEMENT OF THE SLIPS TOWARDS THE SLIP EXPANDER AND TO RELEASE THE SLIPS UPON RELATIVE MOVEMENT OF THE SLIPS AWAY FROM THE SLIP EXPANDER, SPRING MEANS URGING THE SLIP ASSEMBLY TOWARD THE SLIP EXPANDER, A RIGID CONNECTION SECURED BETWEEN THE PISTON AND THE SLIP ASSEMBLY THROUGH THE VERTICAL SLOT WHEREBY ON APPLICATION OF FLUID PRESSURE ON THE PISTON THE SLIP ASSEMBLY IS MOVED IN ONE DIRECTION RETRACTING THE SLIPS.