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Publication numberUS1999279 A
Publication typeGrant
Publication dateApr 30, 1935
Filing dateMay 7, 1934
Priority dateMay 7, 1934
Publication numberUS 1999279 A, US 1999279A, US-A-1999279, US1999279 A, US1999279A
InventorsErwin Burns, Wickersham Harry P
Original AssigneeErwin Burns, Wickersham Harry P
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Slip
US 1999279 A
Abstract  available in
Images(1)
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Claims  available in
Description  (OCR text may contain errors)

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E. URNS EE' @AL SLIP Filed May '7, 1934 Patented Apr. 30, 1935 UNITED STATES PATENT OFFICE SLIP Application May 7, 1934, ASerial N0. 724,296

15 Claims.

This invention relates to! slips and relates more particularly to slips for arrangement in a rotary table bushing. It is a general object of this invention to provide improved rotary drill pipe slips having effective and readily replaceable pipe engaging liners.

Another object of the `invention is to provide a slip having two or more liners for engaging the pipe and a simple dependable means for retaining the removable liners in their proper operative positions.

Another object of the invention is to provide a slip of the character mentioned in which the means for retaining the removable liners the body is simple and inexpensive and does not involve screws or similar parts.

Another object of the invention is to provide a rotary drill pipe slip of the character mentioned involving replaceable liners which cannot become wedged or tightly set in the body of the slip and, therefore, may be easily and quickly replaced.

Another `object of the invention is to provide a slip of the character mentioned in which a single plate is arranged in a groove in they body of the slip to hold the removable liners against displacement, which plate is held in place by a simple, practical means which is not subjected to any breaking strains `or forces.

A further object of the invention is to provide a slip of the character mentioned that is light in weight and that is inexpensive of manufacture.

vOther objects and features of the invention will be better and more fully understood from the following detailed description of a typical preferred form and application of the invention, throughout which description reference may be had to the accompanying drawing, in which: Fig. 1 is a plan elevation of a set of slips of the present invention arranged in the master bushing of a rotary table. Fig. 2 is an enlarged longitudinal detailed sectional view of one of theslips removed from the master bushing. Figs. 3 and 4 are transverse detailed sectional views taken as indicated by lines 3-3 and 4 4, respectively, on Fig. 2 and Fig. 5 is a fragmentary elevation view taken as indicated by line 5 5 on Fig. 3.

The slips of the present invention are adapted to be arranged in the master bushing of a rotary table to engage and support adrill pipe extending into the well. In the drawing we have illustrated a typical master bushing I D arranged in the central opening II of a typical rotary table I2. The bushing Il! has a central opening I3 with downwardly and. inwardly inclined walls. In the typical assembly illustrated in Fig, l of the drawing there are three like slips S arranged intheopening I3 of the bushing I0. It is to be understood that the slips may be designed and proportionedA for vuse in sets of three or more. As the several slips S may be identical We,V will proceed with aY detailed description of a single slip, it being understood that such description may apply equally well to the other slipsv of the series or set illustrated in Fig. 1.

'Ihe slip S includes, generally, a body I5 for arrangement in the opening of a master bushing, replaceable liners I 5 on the body for engaging the drill pipe P and means I'I for removably retaining the liners I6 on the body.

The body I5 is arcuate in its general plan coniiguration having curved inner and outer sides and flat vertical sides I8. The inner surface or side I9 of the body I5 is vertical and is shaped or channeled to receive the liners I5 as will be subsequently described. The outer side of the body i5 has its major portion 20 inclined downwardly and inwardly to t on or cooperate with the wall of the bushing opening I I. The upper outer surface of the body I0 may be cylindrically curved about the same axis of curvature as the inner side I9. Where there are three slips Sv arranged in the master bushing the body I5 is slightly less than extent. The opposite sides I8 of the body I5 may be parallel as illustrated in Figs. 3 and 4 of the drawing. Vertical and radial faces 2l are provided on the opposite sides of the body I5 to cooperate with the opposing corresponding faces 2I on the adjacent slips. Horizontal wings 22 are provided on the upper end of the body I5. The wings 22 project outwardly adjacent the upper end of the body and their outer sides form continuations of the radial end faces 2l. The wings 22 facilitate the equal spacing of the slips S in the bushing opening I3. The wings 22 extend only a short distance vertically of the body I5 and the body in being provided with the parallel sides I8 is light in weight. In practice the wings 22 may be spaced from the upper end of the body and may have curved or inclined upper and lower ends as illustrated.

In accordance with the invention the body I5 is hollow or provided with an internal space or chamber 23. The' chamber the reduced lower end of the body I5 and one or more radialwebs 24 extend through the chamber to reinforce the body. The body I5 is being hollow as just described, is light in weight and easy to lift. A handle H is provided for facilitating the lifting and handling of the slip. The top or upper end of the slip body I5 has a vertical shoulder 26 and two pairs of spaced lugs 2l project outwardly from this shoulder. The handle H includes spaced substantially parallel arms 23 whose ends are received between the lugs 2T. A pin 29 extends through openings in the lugs 2'! and the arms 28 to pivotally attach the handle to the slip body. The handle H has a grip portion or head 30 projecting laterally from the outer ends of the arms 28. Downwardly curved members 3l connect the arms 28 with the head 30 23 may be open atV to strengthen the handle structure. The members 3i project downwardly to form stops to space the handle above the surface of the rotary table I to facilitate the easy grasping and lifting of the handle.

The liners I6 are arranged'on the inner side i9 of the slip body I5 to engage and grip the drill pipe P and in accordance with the invention are readily replaceable. of the invention illustrated inthe drawing there are two spaced independent liners I5 on each slip body I5. The liners I6 constitute the wear taking elements of the slip and are preferably hardened. The two liners I6 of the slip S may be alike or identical and are arranged in longitudinally extending grooves or channels 32 in the curved inner side I9 of the body I5. The liner carrying channels 32 are preferably of uniform depth and width throughout their lengths and have their inner walls concentric with the inner side I9 of the body. The Vertical side walls 33 cf the channels 32 are radial with respect to the axis of curvature of the side IS and the inner walls of the channels. The two channels 3 2 are spaced a short distanceapart and are suitably spaced from the radial end faces 2l of the body.

The liners IE are shaped and proportioned to lit the channels 32 having curved inner sides for bearing againstA the curved inner walls of the channels and having flat radial vertical ends 3ft for cooperating with the end walls 33 of the channels. This cooperation of the radial ends 3d with the walls 33 is in effect a dove-tailed fitting or engagement of the liners in the channelsA which opcrates to hold the liners-against lateral or inward displacement from the channels. The liners I5 are of uniform. thickness except for the gripping ribs or teeth 35 on their exposed sides which project inwardly beyond the inner surfaces I9 of the body. The teeth 35 extend circumferentially or horizontally and present upwardly facing points or edges for engaging the drill pipe P. The lower walls of the channels 32 are formed by an upwardly facing shoulder 36. The shoulder 36 has its majorportion inclined upwardly and outwardly and the lower ends of the liners it are correspondingly inclined to cooperate with this shoulder. It will be seen that the cooperation of the lower ends 3l' of the liners iii with the shoulder 3%* further retainsV the liners against displacement from the channels. In practice a transverse or circumferential groove 33 may be provided in the inner side I9 of the'body to facilitate the subsequent forming or cutting'of the channels 32 and to provide the inclined shoulder 36. The upper inner corner of the slip body I5 is cut back at the surface 3S Yto permit the liners IB to be slid or passed downwardly into the channels 32. vIt is believed that it will be apparent `how the liners It may be readily passed downwardly or longitudinally into the channels 32 to positions where their lower ends 3l seat on the shoulder et.

rlihe means II for releasably locking or retaining the liners i6 against displacement from the channels 32 includes a plate. iii) for cooperating with the upper ends of the liners. A circumferentially extending recess or groove d! of rectangular cross section is provided in the inner side of the slip body I5 at the lower end of the surface 39 to receive the retaining plate fit. The plate il is arcuate in plan elevation and may have its radial ends at or adjacent the radial ends of the wings 22. The plate lill ts the groove @I with suitable clearance and its lower side is adapted to cooperate with the upper ends of the In the preferred form liners I5 to prevent the liners from passing upwardly or longitudinally from the channels 32. As clearly illustrated in Fig. 5 of the drawing the curved exposed edge of the liner retaining plate e!! is spaced inwardly with respect to the teeth 35 so that it does not contact with the drill pipe P.

A central rearwardly projecting tongue d2 is provided on the plate 6E! and extends through an opening 3 in the body I5. The opening 43 extends from the groove 4i to a vertical notch 44 in the shoulder 2S. The tongue l2 is cylindrical and projects into the notch 44. The opening 43 is of round cross section and intersects the upper wall of the slot ffii to readily receive the cylindrical tongue. A transverse or vertical opening 45 is provided in the tongue d2 to receive a cotter key de. The cotter key 116 cooperates with the wall of the notch @4to lock the plate li against displacement from the groove L be entirely received within the notch 44 so that it is not liable to injury or displacement. The plate is held in the groove `4I and cooperates with the upper ends of the slips I6 to positively prevent upward shifting or displacement of the liners it. The cotter key 46 in turn prevents unintentional shifting or displacement of the plate di). The upper end of the cotter key 46 is readily engageable from the upper end of the slip body l5 whereby the plate 40 and liners I6 may be readily removed from the body. f

It is believed that the utility and practicability of they slips provided by this invention will be readily apparent from the foregoing detailed description. As illustrated in Fig. l of the drawing the set' or plurality of slips S is arranged in the opening I3 ofthe master bushing I0 to engage or grip the drill pipe P. The teeth 35 of the liners i6 project from the curved inner sides of the slip bodies to effectively contact and grip the pipe. The slip bodies I5 in being made hollow as above described, and in having the parallel sides |85 are light in weight so that the slips are easy to handle. The wings 22 insure the proper spacing of the set of slips about the pipe P but do not materially increase the weight of the slips. tion of the flat radial ends 34 of the liners I6 with the vertical walls 33 of the channels 32 hold the liners against outward or forward displacement from the channels. The shoulder 36 limits the downward movement of the liners and aids in retaining the liners. The plate 40 is held against upward movement through its cooperation with the groove 4I and cooperates with the upper ends of the liners to prevent upward or longitudinal displacement of the liners fromv the channels. The cotter keys Q6 which removably hold the plates d against displacement are not subjected to any severe usage. The cotter keys i6 are easily engageable and removable to allow theplates 4B to be withdrawn forwardly out of the groovesl 4 I. The liner assembly and the linerretaining means The key 46 may:

The cooperav of the invention are simple and dependable and are inexpensive of manufacture.

Having described only a typical form and application of our invention, we do not wish to limit ourselves to the specific details set forth, but wish to reserve to ourselves any changes or variations that may appear to those skilled in the art or that fall within the scope of the following claims:

Having described our invention, we claimt" A LA slip of the character described including a body having spaced longitudinal channels in-.its inner side, a liner in each of the channels engaging the side walls thereof to be held against lateral displacement therefrom, and a single means removably securing the liners in the channels.

2. A slip of the character described including a body having spaced longitudinal channels, a removable liner in each of the channels cooperating with the walls thereof to be held against outward displacement therefrom, and a detachable plate holding the liners against longitudinal displacement from the channels.

3. In a slip of the character described, a body having spaced longitudinal channels, a removable liner in each channel cooperating with the walls thereof to be held against outward displacement and longitudinal displacement in one direction, and a detachable plate holding the liners against longitudinal displacement from the channels in the other direction.

v 4. In a slip of the character described, a body having spaced longitudinal channels and a transverse groove, a removable liner in each channel cooperating with the walls thereof to be held against outward displacement and longitudinal displacement in one direction, and a removable plate in the groove for holding the liners against longitudinal displacement in the other direction.

5. In a slip of the character described, a body having spaced longitudinal channels and a groove intersecting the upper portions of the channels, a removable liner in each channel cooperating with the walls thereof to be held against outward displacement and downward displacement, a plate in the groove for preventing upward displacement of the liners, and means for removably retaining the plate in the groove. c

6. In a slip of the character described, a body having spaced longitudinal channels adapted to retain removable liners against outward displacement and downward displacement and having a groove intersecting the upper portions of the channels, a removable plate in the groove for preventing upward displacement of the liners, a tongue on the plate extending through an opening in the body, and a removable key on the tongue for holding the plate in the groove.

7. A slip of the character described including a body having a channel in its inner side, a transverse groove in said side intersecting the upper portion of the channel and an outwardly extending opening joining the groove, a liner in the channel retained against outward and downward displacement therefrom through contact with its walls, a removable plate in the groove for preventing upward displacement of the liner, a tongue on the plate projecting through said opening, and a removable key on the tongue cooperating with the body to retain the plate in the groove.

8. A slip including an arcuate body having a longitudinal channel in its inner side and a transverse groove in its inner side intersecting the upper portion of the channel, the channel having radial side walls, a liner in the channel, the liner having radial sides cooperating with said walls whereby it is held against outward displacement, a removable plate in the groove retaining the liner in the channel, and removable means for holding the plate in the groove.

9. A slip including an arcuate body having spaced longitudinal channels in its inner side with radialside wallsand having a groove intersecting the channels and an opening joining the groove, removable liners in the channels having radial sides cooperating with said radial walls whereby they are held against outward displacement from the channels, a removable plate in the groove preventing longitudinal displacement of the liners, a tongue on the plate extending through said opening, and a removable key on the tongue retaining the plate in the groove.

10. In a slip of the character described a body for arrangement in the opening of a rotary table, the body having a curved convex outer surface for seating in the opening, a curved concave inner surface for carrying pipe engaging means, substantially parallel opposite sides, and radial surfaces on said sides adjacent the inner surface for cooperating with adjacent slips.

11. A slip including an arcuate body having spaced longitudinal channels in its inner side with radial side walls and having a groove intersecting the channels and an opening joining the groove, removable liners in the channels having radial sides cooperating with said radial walls whereby they are held against outward displacement from the channels, a removable plate in the groove preventing longitudinal displacement of the liners, a tongue on the plate extending through said opening, the body having an open recess into which the end portion of the tongue projects, and a removable key arranged in an opening in said portion of the tongue and adapted to cooperate with the walll of the recess t hold the plate in the groove.

l2. In a slip of the character described a body for arrangement in the opening of a rotary table, the body having a curved convex outer surface for seating in the opening, a curved concave inner surface for carrying pipe engaging means, substantially parallel opposite sides, and wings projecting from the said opposite sides and having surfaces for cooperating with the corresponding surfaces of adjacent slips.

13. In a slip of the character described a body for arrangement in the opening of a rotary table, the body having a curved convex outer surface for seating in the opening, a curved concave inner surface for carrying pipe engaging means, substantially parallel opposite sides, and wings projecting from the said opposite sides and having surfaces for cooperating with the corresponding surfaces of adjacent slips, the wings being of relatively small extent longitudinally of the body.

14. In a slip of the character described, a body having a channel in its inner side, and a transverse groove adjacent its upper end intersecting the channel, a removable liner in the channel held against lateral displacement therefrom through cooperation with its walls, anda plate in the groove preventing longitudinal displacement of the liner from the channel.

15. In a slip of the character described, a body for arrangement in the opening of a rotary table, the body having an outer surface for seating in the opening of the table and having pipe engaging means on its inner surface, the opposite sides of the body being substantially parallel, and wings projecting from the said opposite sides and having surfaces for cooperating with the corresponding surfaces of adjacent slips.

ERWIN BURNS. HARRY P. WICKERSHAM.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2785454 *Dec 29, 1952Mar 19, 1957Mission Mfg CoSlips for supporting pipe in wells
US6264395 *Jun 19, 2000Jul 24, 2001Jerry P. AllamonSlips for drill pipe or other tubular goods
US6471439Jan 8, 2002Oct 29, 2002Jerry P. AllamonSlips for drill pipes or other tubular members
Classifications
U.S. Classification175/423
International ClassificationE21B19/00, E21B19/10
Cooperative ClassificationE21B19/10
European ClassificationE21B19/10