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Title: Retractable landing shoulder for downhole devices
Claims: I claim: 1. A selectively functionable downhole tool rest device comprising an annular housing means having a longitudinal bore therethrough for passage of fluids and tools, and inner sleeve member slideably received in said housing means; co-active detent means carried by said sleeve member and housing means and defining first and second resiliently detented longitudinal positions of said sleeve member within said housing means; a plurality of circumferentially disposed resilient collet finger members depending from an upper section of said sleeve member and extending longitudinally therefrom; a plurality of radially inward extending bosses carried individually on the respective free-end extremes of said collet members; said sleeve member having inside diameter defining extremes defining a bore equal that of the longitudinal end-extreme bore of said housing means with the radially inward extremes of said collet-carried bosses defining said housing means longitudinal extreme end bore with said sleeve member in a first detented longitudinal position; said housing means being formed with a bore transition with which camming surface means on the longitudinal end-extremes of said bosses engage to urge said bosses radially inwardly upon said sleeve member being positioned to said second detented longitudinal position at which the radially inward extremes of said bosses define a bore less than that of said housing longitudinal end-extreme bore. 2. The tool rest device of claim 1, wherein the inner wall of said housing means is formed with a first annular inclined-surface transition between a sleeve member outer diameter defined portion to a portion having a lessor bore intermediate than that of said sleeve member outer diameter and that of said housing means; said inner wall of said housing means being formed with a second annular inclinded-surface transition between said intermediate bore and that of said housing means; said collet-carried bosses being formed with an inclined end-extreme surface for camming engagement with said first housing bore transition upon said sleeve being shifted from said first detented longitudinal position to said second detented longitudinal position whereupon the radial outward extremes of said bosses ride on said intermediate bore portion of said housing. 3. The tool rest device of claim 2, wherein said sleeve member upper portion is formed with a pair of longitudinally displaced radially inwardly extending internal stop shoulders respective ones of which comprise a downhole facing shoulder and an uphole facing shoulder for respective co-acting positioning engagement with a downhole positioning tool for selective longitudinal positioning of said sleeve member to said first and second detented positions within said housing means. 4. The tool rest device of claim 3, wherein said housing means is formed with an annular internal stop shoulder against which the upper extreme of said sleeve member abutts with said sleeve member in said first detented longitudinal position within said housing means. 5. The tool rest device of claim 4, wherein the upper portion of said housing means is formed with a bore intermediate that of said housing longitudinal extreme bore and the larger bore section of said housing means defined by the outer diameter of said sleeve member, with a radially outwardly extending annular recess formed therein; said annular recess having respective oppositely inclined surface side walls; and said sleeve member carrying radially outwardly extending spring loaded bosses conformingly engageable with said housing annular recess with said sleeve member in said first longitudinal position thereof, and outer extremes of said bosses engaging said housing means larger bore portion with said sleeve member in said second longitudinal position thereof. 6. The tool rest device of claim 5, wherein said sleeve member upper section is formed of first and second space-separated annular members between which a plurality of longitudinally extending resilient web members depend; each of said web members carrying thereon one of said spring-loaded bosses; and with said resilient collet members depending from the lower one of said first and second annular members. 7. The tool device of claim 4, wherein said housing means larger bore portion is formed with a radially-outward, circumferentially extending recess therein; said sleeve member upper section comprising a hollow cylindrical member, the outer surface of which is formed with first and second longitudinally displaced annular recesses having inclined-surface side walls; and a resilient snap-ring confinably carried in said housing recess to effect a longitudinal position detent for daid sleeve member by being resiliently seated in respective ones of said cylinder member recesses, with said sleeve in said first and second longitudinal positions within said housing means. 8. The tool rest device of claim 7, wherein said snap-ring is formed with beveled inner edges to conform with the cross-section of said cylinder member annular recesses and effects, by camming action, expanding deformation of said snap-ring upon said sleeve member being moved between said first and second longitudinal positions thereof. 9. The tool rest device of claim 7, wherein said housing means is formed of an upper section and a lower section each with means on the extremes thereof for interconnection with a tubing string; means for threadedly interconnecting said housing upper and lower sections with one section extending longitudinally beyond the threaded interconnection and concentrically within the bore of the other section with the inserted end extreme thereof defining one wall of the recess into which said snap-ring is confinably received. 10. The tool rest device of claim 9, further comprising 0-ring sealing means confined between the outer wall of the inner concentric one of said housing sections and the inner wall of the outer concentric one of said housing sections. 11. In a tubular housing threadedly connectable to a pipe string, internal shoulder means on resilient collet arm extensions from a sleeve member movable radially inwardly and outwardly between inward restrictive bore opening and outward full-bore opening positions; and collet arm extension shoulder positioning cam means in said tubular housing for camming said collet arm extensions between the radially outward and inward positions, using primarily straight longitudinal movement of the sleeve member, with the resilient collet arm extensions, through a camming range of movement. Other info: Inventors: Raulins, George M. (Dallas, TX, US) Application Number: 535958 Filing Date: 1974-12-23 Publication_date: 1976-02-10 Assignee: Otis Engineering Corporation (Dallas, TX) Primary Class(es): 166/214 Other Classes: US Patent Ref:
Other Refs: Primary Examiner: Leppink, James A. Assistant Examiner: Attorney: Kintzinger; Warren H. |
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