E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/61, 255/14.2
E21B 19/06 (2006.01) E21B 19/07 (2006.01) E21B 19/10 (2006.01)
Patent
CA 1109054
COMBINED WELL CASING SPIDER AND ELEVATOR ABSTRACT OF THE DISCLOSURE A combined well casing spider and elevator is formed of a main body including a base wall, a top wall, a pair of lateral walls, a first end wall, and a second end wall, the second end wall having two sections spaced from one another. The main body has a bowl inner wall tapered to reduce the diameter from the top wall to the bottom wall. A gate member is pivotally secured to one of the sections of the second end wall and releasably secured to the other of the sections to connect the two sections when in a secured position. The gate member pivots laterally when released to permit the lateral entry of a well casing within the area defined by the bowl inner wall. The gate member has a gate inner wall co-operating with the bowl inner wall to comprise a bowl section. A circumferential array of casing gripping slips are arranged in opposing pairs for vertical and radial mounting in surface contact with the bowl inner wall. The gripping slips form a circular hole within the center thereof to receive a well casing and are vertically movable along the bowl inner wall to effect radial enlargement and contraction of the circular hole formed thereby by upward and downward movement respectively to release and grip the casing. A cross rod spans the main body and extends into bearing journals which are attached to the lateral walls of the main body. A lever is fixedly attached to the cross rod and vertically movable to rotate the cross rod in the bearing journals. Two crank arms are fixedly attached to the cross rod adjacent either lateral wall and movable with the cross rod to rotate in respective vertical planes. Two lift arms are pivotably connected at one end to the crank arms and at the other end to the upper end of a diametrically opposed pair of casing gripping slips. The array of the casing gripping slips comprise four arcuate segments, the pair of slips the one of which is mounted on the gate inner wall being floating segments with the other pair of slips which are connected to the lift arms being driven segments. A pair of C-shaped members are mounted on the tops of the floating segments and project beyond the edges thereof towards the tops of the driven segments. A pair of arcuate channel members are mounted on the tops of the driven segments and receive the ends of the C-shaped members so that as the driven segments are moved vertically, the floating segments also move vertically.
333715
Gowling Lafleur Henderson Llp
Gray Emma D. (executrix)
LandOfFree
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