Tool saver
AssigneeFrontier Oilfield Sales Ltd.
InventorRobert Boscher
Life of this patent
Estimating the term…
Abstract
A housing, having at least a top wall and a spaced parallel bottom wall, has aligned openings in the top and bottom walls and a path extending between the aligned openings. The housing is mounted over a well bore so that the openings are aligned with the well bore. In the housing are a pair of blocks which are pivotable from an open position, in which the path is cleared, to a closed position, in which the blocks extend across the path. Wire line tools are mounted through the housing into the bore and thence into the well. When the tools are raised from the well, the blocks are in their closed position whereby to prevent the tools from falling back into the well should the wire break.
Claims5
A tool saver for mounting over a well bore, comprising:
- a housing having at least a top wall and a spaced parallel bottom wall;
- aligned openings in said top and bottom walls defining a path through said housing;
- said housing being mountable over said well bore so that said openings are aligned with said well bore such that tools may be lowered into and withdrawn out of said well through said aligned openings by a wire line;
- a pair of pivoting blocks mounted in said housing, said blocks being pivotable from a closed position, wherein said blocks extend across said path to partially block said path, to an open position wherein the blocks are removed from said path to open said path;
- each said block being mounted on a separate shaft for pivoting therewith;
- a respective handle being fixedly connected to each said shaft, each handle having one end connected to its respective shaft and a free end;
- whereby pivoting said handles will cause said blocks to pivot;
- and further including spring means, said spring means having a first end and a second end, said first end of said spring means being connected to the free end of one of said handles and said second end being connected to the free end of the other one of said handles whereby said spring means biases said handles towards each other into said closed position;
- adjacent ends of said blocks being spaced from each other to permit the passage of said wire line therethrough even when said blocks are in said closed position;
- wherein, when a tool is withdrawn from said well with said blocks being in said closed position, the force of the upward motion of said tool will force apart said blocks, against the bias of said spring, so that said tool can be moved upwardly along said path;
- and
- after the tool has passed the blocks in the upper movement thereof, said blocks will automatically be returned to said closed position by the biasing action of said spring means;
- whereby, when a tool has been pulled above said pivoting blocks, the pivoting blocks in the closed position will prevent the tool from falling back into said well.
Dependencies are inferred from the claim text.