Importance

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Abstract

A combined well casing spider and elevator has a body defining a bowl inner wall tapered to reduced diameter from the top to bottom end and defining first external guide surfaces being inclined upwardly and outwardly and having a kicker element defining a second coextensive external guide surface being inclined upwardly and outwardly to a greater extent than the first external guide surface. A gate member is pivoted to the body for movement of a well casing to and from the bowl. A circumferential array of casing gripping slips is located within the bowl and form a circular hole to receive a well casing. The slips are vertically movable along the bowl inner wall to effect radial enlargement and contraction of the circular hole to release and grip the casing. A slip actuating mechanism is provided having a cross-rod extending across the body and having end portions received within journal bushings fixed within the body and also having crank arms fixed to the cross-rod and lift arms being moved by the lift arms for raising and lowering the slips. Wear resistant polymer guide pads of the lift arms have guiding engagement with the first and second external guide surfaces of the body during upward movement of the lift arms to cause first and second segments of upward spreading movement of the lift arms and the slips during upward lift arm movement to cause first and second segments of upward and radially spreading movement of the slips. The cross-rod incorporates positioning shoulders and jamb nuts which ensure maintenance of proper adjustment of the crank arms relative to the cross-rod. A wear resistant latch mechanism is also provided for latching and releasing the slips.

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First Claim