US1541669A - Casing spider - Google Patents

Description

June 9, 1925; 1,541,669

R. B. SUMMERS CASING SPIDER Filed NOV. 10, 1924 4 Sheets-Sheet 1 INVENTOR .ATTORNEY WITNESS:

June '9, 1925. 1,541,669

R. B. SUMMERS CASING SPIDER Filed NOV. 10, 1924 4 Sheets-Sheet 2 WITNESS:

ATTORNEY June 9, 1925. 1,541,669

R. B. SUMMERS GAS ING SPIDER Filed Nov. 10. 1924 4 She ets-Sheet 5 INVENTOR WITNESS:

ATTORNEY R. B. SUMMERE CASING SPIDER Filed NOVv 10. 1924 4 Sheets-Sheet Patented June 9, 1925.

UNITED STATES PATENT OFFICE.

Application filed November 10, 1924. Serial No. 749,070.

To all whom it may concern:

Be it known that I, ROBERT B. SUMMERS, a citizen of the United States, residing at Tulsa, in the county of Tulsa and State of Oklahoma, have invented new and useful Improvements in Casing Spiders, of which the following is a specification.

This invention relates to a casing sup porting device for the casing of oil wells and the like, the general object of the invention being to provide means whereby the device will be self-adjusting, and thusprevent damage to the casing due to an uneven arrangement of the parts.

This invention also consists in certain other features of construction and in the combination and arrangement of the several parts, to be hereinafter fully described, illustrated in the accompanying drawings and specifically pointed out in the appended claims. r

In describing my invention in detail, reference will be had to the accompanying drawings wherein like characters denote like or corresponding parts throughout the several views, and in which Figure 1 is a side view showing how the invention is used and with the parts held at an incline by the jacks.

Figure 2 is a sectional view through the device.

Figure 3 is a plan view.

Figure 4 is an elevation of the inner member.

Figures 5, 6 and 7 are views showing a modification.

Figures 8, 9 and 10 are views showing another modification. I

In the drawings, 1 indicates the spider which is provided with a central opening and 2 indicates the bowl which fits in the opening and which carries'the tapered ring 3 in which are located the toothed slips 4 which are of arc-shape and have their outer walls tapered to fit the ring with the inner walls toothed to engage a casing, such as shown at A.

As will be seen the parts are so shaped that the slips will tend to move downwardly in the tapered ring and thus have their toothed faces pressed against the casing to grip the same. The bowl 2 has diametrically arranged trunnions 5 adjacent its upper edge which engage bearing recesses 6 in the top of the spider so that the bowl has rocking movement in the spider and it is guided in this movement by the diametrically arranged ribs 7 on the bowl engaging the grooves 8 in the spider, the outer faces of the ribs and the inner wall of the grooves being curved so as to prevent play of the parts in the rocking movement of the bowl. The spider is provided with the handles 9 so that it can be attached to a crane or the like. Instead of having the bowl supported by the trunnions, the outer wall of the bowl may be of semi-spherical shape, as shown at 10, to engage a similar shaped wall of the opening in the spider 1. as shown in the modification illustrated in Figures 5, 6 and 7. In this case the bowl engages the curved wall of the opening in the spider so that it is firmly supported and the ribs 7 act to prevent rotary movement of the bowl in the spider.

In both cases it will be seen that the bowl is self-aligning and if one'jack B should be raised to a greater extent than the other jack C so that the spider would be tilted the bowl would move in the spider and thus keep the casing A straight, as shown in Figures 1 and 5. This arrangement of parts will prevent damage to the casing through an uneven pulling strain which tends to strip the top joint or part the casing at the top joint. The bowl with its gripping members will align itself in the spider if the jacks are unevenly operated so that one side of the spider is raised quicker than the other side or the dirt or mud sills give way or sink under the weight on one side more than the other.

. In the modifications shown in Figures 8, 9 and 10 I rotatably arrange the ring 3' and the slips 4 in the bowl 2 so that the string of casings can be rotated, while being supported by the device, in order to tighten the joints between the casings by turning one casing in relation to the other to make the screw threaded connections tight. In carrying out this arran ement I provide a member 12 which is p aced between the bowl and ring and place antifriction bearings 13 between said member and the bow-l so that the member can rotate in the bowl with the minimum amount of friction. The member is provided with a flan e 14 at its'upper end which overlaps the owl and acts to prevent dirt and other foreign matter from reaching the bearings. I alsoprovide a latch member for locking the member to'the bowl when the swiveling action is not desired. These latch means each consists of a bracket 15 fastened to the top of the bowl and projecting over the member so as to hold the member in place. An angle-shaped latch bar 16 is pivoted to each bracket and is adapted to engage any one of a number of notches 17 formed in. the flange 14 of the member so as to hold the memberagainst rotary movement. The upper ,end of each latch bar is weighted, as at 18, so that the latch bar Will'be held in either its operative or inoperative position when moved to such position. In Figure 8 I show ball bearings at the upper and lower ends of the member and roller bearings at the sides of the member though it will of course be understood that ball bearings may be used at the sides as well as at the ends.

Figure 9 shows the member 12 made of stepped formation at its exterior and the interiorof the bowl of like formation with the ball bearings 13 between the stepped parts.

I desire it to be understood that the antifriction bearin s may be of any desired type or form so as to permit rotary movement. of the casings, with the least possible friction on the bowl.

As before stated this arrangement will permit the casings to be rotated so as to permit one section to be screwed to another and this arrangement also permits the bowl to move. in the spider to align the parts as in the first construction.

It is thought from the foregoing description that the advantages and novel features of my invention will be readily apparent.

I desire it to be understood that I may make changes in the construction and in the combination and arrangement of the several parts, provided that such changes fall within the scope of the appended claims.

What I claim is 1. A device of the class described comprising a supporting member, a bowl movably mounted therein, means for preventing rotary movement of the bowl in the meniber, means carried by the bowl for gripping a casing, such means comprising a ring of tapered shape engaging the tapered interior of the bowl and tapered slips in the ring for engaging the casing.

2-. A device of the class described comprising a spider having an opening therein with oppositely arranged grooves in the wall of the opening, a bowl fitting in the opening and rockably supported therein, ribs on the bowl for engaging the grooves and casing engaging means inthe b w 3. A device of the class described comprising a spider having an opening therein with a pair of oppositely arranged grooves in the wall of the opening, a bowl having trunnions therein fitting within the opening, with the trunnions engaging bearings in the spider, ribs on the bowl for engaging the grooves and easing engaging means .n the bowl.

4. A device of the class described comprising a supporting member, a bowl movably mounted therein, a member rotatably mounted in the bowl and means carried by the member for gripping the casing.

5. A device of the class described comprising a supporting member, a bowl movably mounted therein, a member rotatably mounted in the bowl, means carried by the member for gripping the casing and anti friction means arranged between the bowl and the member.

6. device of the class described comprising a supporting member, a bowl movably mounted therein, a member rotatably mounted in the bowl, means carried by the member for gripping the casing, anti-friction means arranged between the bowl and the member and means for locking the memher to the bowl when desired.

In testimony whereof I afiix my signature.

ROBERT B. SUMMERS.

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