Patent GB-468085-A (GB)
Title: Improvements in elevators for handling pipes and the like in wells
IPC: E21B19/10
Filed: 1936-03-20
Abstract: 468,085. Handling pipes &c. in wells. MARRIOTT. H. L. (Byron Jackson Co.) March 20, 1936, No. 8389. [Class 85] [Also in Group XXX] An elevator for raising and lowering pipes &c. in wells comprises a pair of hinged members adapted to be locked about the pipe &c. and having inwardly and downwardly inclined inner seats supporting wedge slips adapted to grip the pipe &c. and means responsive to opening movement of the members for lifting the slips out of pipe engaging position. In Figs. 1, 3 and 8, members 1, 2, hinged on a pin 3, are adapted to be held closed by a spring-pressed latch 10 pivoted at 12 and engaging a shoulder 11 on the member 1, the latch carrying an auxiliary spring-pressed latch 14 pivoted at 15 and adapted to hook into a recess in the shoulder 11. Each member 1, 2 carries a pair of slips 24, 25 on stepped conical seats 20, the slips of a pair having lug and recess engagement 41 ensuring simultaneous movement. Each slip has a rectangular passage 26, Fig. 8, receiving a square, round or oblong guide pin 27 anchored between a lower flanged bushing 29 and an upper bushing 31 held by screws 33. A floating cam 43 surrounds the hinge pin 3 and has a flange 44 engaging recesses in the adjacent slips and provided at its ends with inclines 46 co-operating with inclines 47 on the members 1 2, whereby on opening the latter, the slips are lifted. The slips are then held in raised position by a latch 54 pivoted at 55 to an arm 52 integral with or welded to one of the slips and pressed by a spring 60 in a housing 50 into engagement with a shoulder 56. On closing the members 1, 2 round a pipe 65 and raising the device, contact with a pipe collar 66 trips the latch and the slips fall. Each slip has a bifurcated serrated plunger 70 embracing the guide rod 27 and pressed by spring 72 to engage the pipe 65 to hold the slip to its seat. The springs 72 may be of such strength as to assist in setting or raising the slips. In another form, Figs. 11 and 13, body member 81, pivoted to member 82, has at opposite ends ears 84 to receive supporting links, and each ear has a pivoted latch 85 with an arm 86 which is engaged by an entering link to close the latch ; a catch 87, pressed by spring 90, co-operates with shoulders on the latch to hold the latter in open or closed position. Each latch has shoulders 91 engaging below shoulders 92 on the body member 81 to distribute strain. The members 81, 82, each carry a pair of linked slips 93, 94, 95, 96, each slip being guided by a pin 99, Fig. 16, and supported, if desired, by a spring 102. Each member 81, 82 has a cam 105 engaging below a projection 106 on a slip carried by the other member so as to lift the slips on opening the device. The slip 96 has an arm 111, Fig. 14, projecting into a housing 110 on the body member 82 and carrying a pivoted latch 115 pressed by a spring 116 so that when the slips are raised, the latch engages a shoulder 126 to hold the slips 95, 96 in raised position and also, through an arcuate arm 95a, Fig. 11, to hold slips 93, 94 in raised position. The latch is tripped when desired either by contact with a pipe collar 150 or by a cord attached to eye 124. A spring-pressed latch 130, Fig. 11, co-operates with noses 132, 133, to hold the device closed and may have a screw 140 adapted for adjustment so as to engage a ridge 139 on nose 132 and prevent freeing of the latch until the slips have been raised.