| 摘要 |
In the preferred and illustrated embodiment found in the drawings herein, tool retaining apparatus is disclosed. It is a catch mechanism for catching and securing wireline tools. It incorporates an elongate tubular body to be attached at the well head and works above a producing well. It is axially hollow to pass a wireline supporting a down hole tool. The elongate tubular body surrounds a sleeve positioned within it. The sleeve has a shoulder around its exterior to define upper and lower pressure receiving chambers, thereby enabling external pressure to be applied to drive the sleeve up or down. The sleeve supports a pair of opposing pivotally mounted flaps at the top end. The flaps have laterally projecting tabs which are positioned in cavities to enable the flaps to extend toward one another. They are supported on a shoulder to maintain a catch position. Because they are pivotally mounted, a wireline supported down hole tool can be retrieved upwardly through or past the flaps. The flaps, however, extend across the center and are positioned adjacent to one another. They bottom support the tool once it is above the flaps. The flaps can selectively be retracted to a withdrawn position.
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