US2771957A - Retrieving tool fitting in and engaging wash pipe - Google Patents

Description

J. H. WEBER Nov. 27, 1956 RETRIEVIHG TOOL FITTING IN AND ENGAGING WASH PIPE 3 sham-sheet. 1

Filed Dec. 9, 19 54 J. H. WEBER Nov. 27, 1956 3 Sheets-Sheet 2 Filed Dec. 9, 1954 l n I 0/! 8 5 i W I 5 5 415 11/11 4/ 5 m V/I/ H w 7 f////// 5 l 7 I IN V EN TOR.

J. H. -WEBER Nov. 27, 1956 RETBIEVING TOOL FITTING IN AND "ENGAGING WASH PIPE Filed Dec. 9, 1954 8 Sheets-sheaf. 3

wall/VI IN VEN TOR.

United States Patent RETRIEVENG TOOL FITTING IN AND ENGAGING WASH PIPE John Hugh Weber, Abilene, Tex.

Application December 9, 1954, Serial No. 474,197 a 7 Claims. (Cl. 166-218) My invention relates to a retrieving tool fitting into and cooperating with the wash pipe which 1s used in recovery operations in the drilling of deep wells such as 011 wells, and especially to such wells as are drilled with a rotary bit. For such operations the wash pipe, of larger diameter, and of suificient length to complete the recovery operation, is attached to the bottom end of the stem of drill pipe and lowered into the hole. has attached to its lower end the fishing tool which has a diameter smaller than the inside diameter of the wash pipe, and may be any one of several types of tools used in such recovery operations. The cooperatlon with the My retrieving tool wash pipe serves to cause to be pressed outwardly on oc- V casion a set of slips or toothed jaws engaging the inside of the pipe and holding the retrieving tool against sliding in the pipe, and a second set of slips engaging the nside of the pipe and holding the retrieving tool for rotat on in one direction.

The objects of my invention are: First, to provide a sliding slip assembly carrying wiper strips to engage the inside of the wash pipe, which assembly is movable as a whole up and down on the retrieving tool through the txiction of said wiper strips, and carries slips which are made to hold the tool against sliding in the pipe by rela tive motion between the parts of the assembly; second, to provide a rotational drive slip assembly fastened on said tool above said sliding slip assembly having slips or vertical teeth which may be pressed outward to engage the inside of the pipe and hold the tool against rotation, such pressing outward being controlled by wiping fingers which frictionally engage the inside of the wash pipe as same is rotated, but said wiping fingers being kept out of such engagement by means on said rotational drive slip assembly when the top of the sliding assembly is not in contact with the bottom of the rotational drive slip assembly; third, to provide for holding the sliding slip assembly at an upper position just under its contact with the rotational drive slip assembly, and for releasing it from that hold by causing it to turn through a small arc; and fourth, provide for locking the parts of the sliding slip assembly against sliding on each other so that the slips having horizontal teeth may not engage the wash pipe until after such locking is released.

With these and other objects in view my invention resides in the construction and arrangement of parts, herein fully described, and particularly pointed out in the claims.

Referring now to the drawings, which are a part of this specification, and in which like characters indicate like parts:

Fig. 1 is an elevation of my retrieving tool with'the slid-' ing slip assembly in bottom position;

Fig. 2 is a plan view of the rotational drive slip assembly with the top disk 22 removed, the slips 42 and,

the .wiping fingers 46 being placed outside of the disk 23;

' Figj31is a plan view of the top disk 22;

Fig. 4 is a side view of the press pin 30;

I Fig. 5 is a front elevation of the slip 42, wiping finger 46. and press pin 30;

Fig. 6 is an elevation of the lower end of the tool with sliding slip assembly in contact with the rotational drive slip assembly; I

Fig. 7 is a plan View of the clutch 19;

Fig. 8 is a vertical section on the line 88 of Fig. 7; Fig. 9 is a plan view of the upper sliding ring 62;

Fig. 10 is a plan view of the lower sliding ring 63;

Fig. 11 is a section of the gland 16 on the line 11-11 of Fig. 6;

Fig. 12 is a bottom view of the disk 23;

Fig. 13 is a detail of the slip ring 63 in normal position just above the gland 16;

Fig. 14 is a view similar to Fig. 13 with the slip ring 63 resting on top of the gland 16;

Fig. 15 is a view similar to Fig. 13 with the slip ring 63 turned to latch under the latch pin Fig. 16 is a plan view of the slip ring 63, the sleeve 18 being shown in section;

Fig. 17 is a vertical section showing the fastening of the gland 16 to the sleeve 18; and, a i

Fig. 18 is a vertical section of the rotational drive slip assembly taken through the key 21a.

The shank 10 of my retrieving tool is hollow, having a bore 11 running through it full length through which may be passed liquids or the wires leading to a backofi shot as is usual. At its bottom end the shank 10 has a thread 13 to be screwed into a thread in the fishing tool 14 and just above the thread 13 a stop collar 15 is welded or fastened to the shank 10.

Above the stop collar 15 is a cone shaped gland 16 increasing in diameter from bottom to top, and above the gland 16 is the sleeve 18 having its threaded end screwed into a recess in the top of the gland 16 and made fast by a set screw 81. The gland 16 has at its top a shoulder 17. The sleeve 18 extends upward a considerable distance and has at its top end a clutch 19 integral with it, the clutch 19 being a truncated cone having its larger diameter at the top. The gland 16, sleeve 18 and clutch 19 move together as a single piece sliding on the shank 10, and on these members is mounted the mechanism operating the horizontal slips 74, and the term sliding slip assembly is applied to these members and to the mechanism mounted thereon.

A short distance above the clutch 19 is mounted the rotational drive slip assembly which has a cam sleeve 20 provided with a keyway 21 to receive a key 21a fitted into a keyway cut in the shank 10. The cam sleeve 20 has three cylindrical cam surfaces 24, 24 spaced degrees apart, each increasing in distance from the center in clockwise direction, and has at the top an upstanding annular flange 25 to fit into the enlarged inside diameter of the upper disk 22. This upper disk and the lower disk 23 have greater diameters so that they extend outward beyond the cam surfaces 24, 24, and each disk hasthree countersunk holes through which are passed screws 27, 27 threaded into tapped holes 28, 28 in the cam sleeve 20 by which the disk is fastened to the cam sleeve.

At the middle point of each of the three cam surfaces 24 there is cut inwardly a vertical groove 29, which is shown as dovetailed, but which could as well be rectangular, in which the wedging pin 30 may slide up and down. Each wedging pin 30 has at its upper end a is' substantially squarein cross section;

' 39 medi ine. i kzz nsh e;

shines?- T 77 Site press'aga'inst the upper disk 22.: The shelf 33 and all the lower parts of the wedge pin 30 are rectangular in jcross section and the'back of the pin toward the center 7 being in a. vertical plane surface. i The portion fit 'jpst below the shel f 331s: thin, having: agsmall radialf. rne'n sion, and is followed by a curved orw'edging portion 35' increasingin thickness so thatithe next; portion 36 79 willppi ess the; shoulders, sea-gag of'thevdisl; t downward beyond the disk23. t

In the upper disk 22 .are cutthree arcuat'e g 40, and in th e lower. disk 23' are ciit'th're corresponding a'rcila te' guide slots 41$ These guide slots" are oiitside'vof and parallel toithe cam surfaces and begin just be;

' yoncl in clockwise ro'tationthe, point from which the. cam

surface increases in, distanceffrom'i tuecemer-i Y Into the 'g uideslot 40" fits the. upper slip guide 43" for. sliding V therein, and into the guide. s'l'ot 41"fitsflthe -liiwer-slip uts-e44. tThese'slip guidesaie preterab1y ime ia1with thevslip 42, but 'of less thickness alongflthe radius; and extend into the slots 40 and 41,. to, guide the-slip 42 along thetcylindrical camnsurface tz tf which its inside surface is shaped to fit. The outer surface of the slip t 42 is cut into angular Vertical teeth whichfare adapted rounded-portion 31 which fits into and slides ina-roundhole 32 in-the, upper disk 22. Below the rounded potttion 31 there is a shelf 33' which serves as astop for an expansion spring .79 placed on the rounded portion her side to engage the inside of the wash. pipe '12, in order. to

hold against rotation. A horizontal groove or. zone i is channeled across the, teeth, of the slip' 42fatL theirf middle to receive'en d. of; the wipiiig finger 46. wiiic ena is fastened'to the slip 42 by a rivet 47; V t I The wiping finger 46 is a thin s triplof resilient material bentto conform to the cylindrical snrface. of the. inside of the wash pipe 12,, and is .of such overall'tlength thatit reaches-horizontally across the thickest portion of Cam surfae'e l to be in centact with the. wedge; pin 30wh en' the slip fizisf at starting position with referenceto the guide slots', 40jand- .41. 'Aihorizontal groove or; zone a t is channeled across. thethickest portion of cam su t-r face is-sonnet, that the: wiping fingert 46 may. seat therein and not vberorced. against. the inside-of the wash' pipe'12; The wi ingnngerte as a double bend pear its ,free end so} that the freetend.presents a fiat feot 49 whichiisradiallitinward for. the rest of thewipin-g finger 16v towardsfthe; Wedgepin ;30. In normalpo'sitionjfor the wedge pin 30 the fiat foot 49 will rest on thethin portion 374 oft wedge pin when the slip, guide s,.- 43 a ti ai g n' i g n s op is -vt a wip. n -;fin 46 isn'ot pressed; outwardly into -contactrwith' thewaslr pipe .12; biit-lshouldvthe wedge pirr .30ebemoved upward thick: portion 36 thereof: will 2 press the: foot 49 out-t wa'rdto bring the iper strip into such-contact.

Tl"ie u'nde'r sideiof'the lower disk 23 has-two cam sure V race-S151 nearits edge- Teachtendingr-in atvertical'shoulder 52; to provide half of a cliitch' jaw andv the-uppersside of the; clutch 1'9 'hasstwo cama surfaces 53 i to -r'natchi the cain,surfa'ces1. 51near its edge ending each in :a-Lsliouldef '54; These four cam surfaces fit together? a'szazclutcl'i whereby the clutchlQ-cari be tuinedllin aicounterclock Wise direction. when: it: is (in engagement with" disk 23? The,- rest ofthe toptsideof clutch '19 inward rein} the the shanks-c37 may-race. i

t .7 ram n e 23 the vs'edge'pins '30 atepressed iiipwardlj against the springs-'79 so 'that'the full widthportion 36 ofeaeh-pinpresses the foot 49 outward bringing the'wiping finger 46 into contact with theinside of the, wash pipe 12. 'By turning the 'wash pipe 12 to the right the slips 42 are caused to slide on the cam surfaces 24 so that they engage firmly the inside of the pipet12 and cause the retrieving tool to turn with the pipe 12 to the right, oriin V clockwise direction, and be held against movement upward or downward 'in the pipe.. Should the pipe 12 be turned to the left, orin counter clockwise direction, the slips 42'will be backed oif from engaging the pipe 12, and, unless the wedge pins 30 are again raised by moving will remain out-'of contact'with'the" inside of the pipe 12.

Just below the upper surface of the clutch member 19 a two aligning arcu'a'te grooves 55"'refctaiigular in cross section arecutiit-the sdrea sn; eacheoveringineaily a half circle and ending inanaabutment'78. at the counterclockwise end of the groove. At thebe'ginning of each of the grooves a slot is cut through to the top of the clutch member 19.' The shank 10=has a notch 79 extending; inward to contain a detent 57' swinging on a' piiitSS; and pressed outwardly by a sp'iiriglSQL The fcle t tent S Thas attapered surface on its underside' jso that matinee-191 eanrp'ass ove'r' it and press itinw rdi and a fiat s urface norn 'sl'tq the. shank 101m fit and hold-in one of uthetwoshalf grooves 55. and thereby prevent down-t wardlinovementofjthe clutch 19 on the shank- 10. Upon mrning; ;he. 1u h 19 n; counter clockwise directionthe detent 57 willbe stopped by the abutment 78, andTu'p'on' turning; the, clutch 19 to the right. the detent 57 will hebrought under the slot 60 and theclutch 19 can he slid downward alonglthe'shank 10." The position. of,

detent 57,- on the shankl10 is suchfthat when it engages the clutch thalatterzwilltheheldslightly apart from tthe disk 231withthe wedge pins-30not raisedu j 7 7 The sleeve ISha'sLa key 6 1 extendingfrom its outer surfaeefor' the full length of the sleeve" Slidable on the t sleeve 18 are an upper sliding ring 62 andalower; slid ingring 63,: eaeh having awide' keywayj tto fit the t key 61 loosely and. thereby permit. 'a' limited turning of the ring;s, .62 and. 63, about the sleeve 18. Thesesliding rings; 6 2 -and r63,- are connected by; three wiper strips 65,-

'ofresilienhmetaljhaving at each end a short portion parallelto the sleeve 18' fastened; in a notch on thepcircumfe rencewo f one of the slip rings; 62-or (Sig-bya-grive't 66,,then a bent portion slantingoutwardly; andrinthe middle a long; wiper: portionv parallel to the sleeve '18 V V and far: enough out from the center toimake 'frictional f contact'withthe inside-of wash'pipe12; Thelowei' sliding ring 63 has'a notch 67- cut upward from; its iunder side to the left or the 'keyway 64th receive the:dowell;pin 68e'fastened on the shoul'deri17,=and a verti= cal slot 69ieutithroug'hit to the-rig'ht-nf 'tHe'keywayiM through-which= will pass-'the.:latch pin 7ti'which eiteiids upward from the? shoulder: 17. when' thei sliding fin is gioQve-sjs's'smiit e clutch"nienfber l9"isgfstopped froin in sueh alignment off rotation about-its aids the end wiii -reseu enthetep of-theslidiiigringfilwhen a, ring has?- been turned* in co'uiiter clockwise" .directionjso ingofjthe sliding iin'g'63 movies the yertic'a'l slot'6 9with reference tothe latch'pin" a'nd;brings' its meander:

turningjiii counter clockwise} direction by the detent'corilingin'to contact'with the' abutment 78, as will be hereina ftertexplainede t: v 7' t V V Theslidin'g'riiighlhasnhiee horizontahslotssfll its middle toireceive th'e 'ends" 3,-bent at a right angle the sire" "i sl y i bwfii e;s -1 -1 e oinhsse slots 71 is tii l jo'ii an arc wider than the strap end 73 so i thatthe strap end may slide in the slot when the sliding ring 63'is turned slightly on the sleeve 18. j

The slips 74 slide up and down on the'gland'16. Each slip has its inner surface cut so that it may slide on the conical surface of the gland 16 and has a keyway to permit sliding on a dovetailed key 75 vertically disposed and fastened on the gland 16. The outer cylindrical surface of each slip 74 is vertical, and is cut to providea series of horizontal teeth to grip the inside of the wash pipe 12 and hold the retrieving tool against'sliding down in the pipe. A vertical channel 76 is cut across the upper teeth into which the strap 72 is inserted and fastened byarivet77.

In the operation of my device the retrieving tool is held vertical, as by being threaded into the fishing tool which is held at the platform above ground by the slips on the platform, and the wash pipe 12 is lowered over it. Raising the wash pipe causes the slip rings, 62 and 63, to be raised by friction of the wiper strips 65, and lift the" slips 74 along the gland 16. so that they spread out and their teeth engage the wash pipe thereby holding the retrieving tool against sliding downward in the wash pipe 12. Raising the wash pipe 12 still further lifts the clutch 19 into contact with the disk 23 causing the wedge pins to slide upward and bringing the wiping fingers 46 intofrictional contact with the inside of wash pipe 12. Ashort turn of the wash pipe 12 in clockwise direction will then bring the slips 42 into engagement with the inside of the wash pipe to hold the retrieving tool for clockwise turning with the pipe, and also to hold it against sliding in-the pipe, especially against sliding upward. The clutch member 19, being held in angular position about the shank 10 by the setting of the slips 74 against the wash pipe 12 will not necessarily be rotated at all about the-shank 10 as the rotary grip and its lower disk'23 are turned slightly in clockwise direction, since the lower disk 23 and shank 10 can rotate so as to take a different angular position from that of the clutch 19;

The clutch 19 can now be permitted to slide down a shortdistance away from the disk 23 to where the detent 57 will engage in one of the grooves in the clutch member 19 and hold it against further downward'sliding; 'Iheslips 74, being in engagement with the wash pipe 12, will tend to hold the sliding rings, 62 and 63, in the same vertical position with reference to the wash pipe 12, and the gland 16 sliding down a short-distance along with the clutch 19 will tend to force the slips 74 more firmly outward.

The retrieving tool is now threadedinto the fishing tool 14 and locked to the wash pipe 12, and is ready to go down into the drilled hole. Suflicient lengths of wash pipe to effect the recovery operation are made up together, and the top joint attached to the drill pipe, which is of smaller diameter; then the whole string of fishing tool, retrieving tool, wash pipe and drill pipe is lowered into the hole until the bottom end of the fishing tool 14 reaches the top of the lost tool or lost work piece. Then by some manipulation, turning the wash pipe from above, and applying some of theweight of the string the fishing tool can be threaded into the lost tool or lost work piece.

After connection has been made with the lost tool it will be desirable to start the washovcr operation to wash oif the dirt from around it. For this it will be desirable torelease the retrieving tool from gripping the wash pipe so that the Wash pipe can be passed downward over the tool. To accomplish thisallow some of the weight of the string and the wash pipe 12 to bear down on the re-' trieving tool and give the wash pipe a slight counter clockwise rotation of about half a turn. This will loosen the grip of the slips'42 on the wash pipe 12 and'bring the wiping fingers 46'back to where their feet 49 rest upon the thin; portions 34 of the wedge pins 30. The clutch 19 willthen'b e held against sliding down on the shank It! by the detent 57 engaging in one of the grooves 55. By thep giving the wash pipe'l'2 a slight turn in'clockwise' direction the friction of e wiper strips 65 will cause the clutch 19 to turnin clockwise direction about the shank 10 bringing the slot 60 over the detent 57." This permits the clutch 19 and the whole sliding slip assembly to slide downward on the shank 10, and, with the downward movement of the wash pipe 12 it slides down until the bottom of gland 16 is in contact with the stop collar 15. The retrieving tool will then ofier no resistance to the downward movement of the wash pipe 12, and when the latter reaches the stuck point the dirt can be washed from around the lost tool.

It may be also desirable to set the retrieving tool so that the wash pipe 12 can be pulled upward over it without causing the slips 74 to come into contact with the wash .pipe. To accomplish this the drill string and wash pipe are raised a distance suflicient for the friction of the wiper strips to bring the clutch 19 upward to where the detent 57 engages and holds in one of the grooves 55. Then the wash pipe 12 is given less than a half turn in counter clockwise direction to cause the clutch 19 to rotate in counter clockwise direction about the shank 10 until the detent 57 is in contact with the abutment 78 so that the clutch 19, the sleeve 18 and the gland 16 are held against rotation in a counterclockwise direction. Next the wash pipe 12 is lowered so that the wiper strips 65 will bring the sliding ring 63 down on the sleeve 18 into position for latching, which position is just above the dowel pin 68 with the latch pin 70 extending through the slot 69; Finally the Wash pipe 12 is given a short turn in counter clockwise direction so that the wiper strips 65 will cause the sliding ring 63 to move slightly in that direction as far as is permitted by the extra width of the keyway 64, and become latched under the latch pin.7.0. With this latching accomplished the slips 74 cannot slide upward on the gland-16 to come into engagement with the inside of the wash pipe 12 and the latter can be raised to a point where it is desired that the retrieving tool engage it at a new position.

To reengage the retrieving tool with the wash pipe 12 the latter is rotated slightly in clockwise direction suflicient to cause the Wiper strips 65 to move the sliding ring 63 in clockwise direction and unlatch it from the pin 70. The slips 74 can then slide on the gland 16 and be brought into engagement with the wash pipe 12 by lifting same as above shown. It will then be desirable to effect the grip of the slips 42 by rotating the wash pipe 12 as above shown to hold the retrieving tool from sliding upward in the wash pipe as well as against relative rotation. Whether the grip of the slips 74 was effective can be told by the additional indicated weight of the string. After both slips 74 and 42 have engaged the whole string with the lost tool at, the end can be lifted out.

What I claim as new, and desire to secure by Letters Patent of the United States, is:

l. A grip against rotation fitting inside of a pipe, comprising a longitudinal shank, a sleeve fastened on said shank having a plurality of cam surfaces each increasing in distance from the axis. in one direction of rotation, a slip for each cam surface adapted to slide thereon having extensions upward and downward beyond said cam surfaces and having longitudinal teeth to engage the inside of the pipe, means fastened to said shank disposed above and below said cam surfaces for guiding said extensions as each of said slips slides on its cam surface, a wiping finger extending transverse to the axis attached to each slip at one end having the free end adapted to be pressed outwardly to bring the wiping finger into frictional contact with the inside of the pipe, said sleeve having a groove cut longitudinally in each cam surface, a wedge pin having a thin portion and a thick portion mounted toslidein each groove from the point where a thin portion of the pin underlies the free end of the wiping finger to the point where a thick portion thereof underlies and presses outward the free end of the wiping 7 amps? wed e Pin and m weqh n n its ew tqwh its k; p ni n e ie the nd fr hewipi finger; v

i-s naa a s m en; n le; p p wm:

eas ng-alongit1dinal shank, a sleeve tastened'on said shankfand a disk fastened to each end of the sleeve, said sleeve-having,Qamluralitwof; cam suIfaces each inCIeaSing in edist-aneerfromitheaxis in one direction I of rotation, at

t slip {preach earn si rfaee adapted =to slide thereonhaving V lengitudinabteeth?togengagethe inside-of;the'gpipe a guide portion "ateach end-ofaslim-a guide 'slotin each of-the disks; said guide slots receivin'g an'd holding said guide portions so; that eachslip may. slide on the cam surface,

awipinggfinger extending transverse to the axis attached to-eacli slip; at= one: end =havi-ng=-1the free nd adapted to be pressed" outwardly? f0: bringethe Wiping finger into:-

frictional contactwithlthe'insideofithe pipe; a groovecut lohg itudinally-irieach cam surfaceeach of the disks havingian opening;aligningwithsaid groove, a-we'dge pin fiibunted to :sli'de in said groove'with'its ends-extending the inside 'of ithe 'pipe 'and having-at: one: end a normalsurface t'd contact said wedg'epins and move.each pin in itsgrbove to Where its thick portion u'nderlie's' the end of the wipin'gfingef; t t

' 3: grip against :rotation"as-described'in claim l wh'eie'in each wedgeipin ha :an abu'tment to'- engage the disk whichis on one side of tlieisleeve; and a spring pressing against the other disk and against a" second abutment on the'wed'g'e' pin holding its thinportion under the free end; of th'e vviping fihger, but permitting -the Wedge pin to be'moved -a'g'ainstsaid spring to bring its thick portion under-said free end. v

- 4'; A' meniher-"slidable upon-a verticalshankyboth posh' tidned within a-vertical pipe; stops on said shank above andbelowsaid rr'ien'lber' to limit itssliding; said member havingat its-lower enda gland increasiri'gtin its conical diameter from h'ottorn to top, a sleeve above said gland having a key for its "entire length, and a member of large? diain'etef than the'topbf said-gland slidable'on'said' shaft above said sleeve; two slidihg rings; each 'havin'g' I akeyway for said key joined by vviper strips which extendoutwar d tocontact theinside of said fiip'e; said twdslid ing ringssliding on said sleeve,a plurality of slipsb elow said sleeve "s'upport'e'd by straps from' the lower 'o'f':said

sliding rings, each slip having a'n inside surface contactifigfsaid' -glandto-permit the sliptd slidethereon and a cylindricalouter surface provided with horizontal teeth vvhicli engage the inside of said pipe when the slip is lifted ithe Irnemher 'abo've" said" sleeve having an annular I s. -A'-member s lidableup'on a ver ical shank; both we sitioned Withitl; a vertical pi-pe stops n said shank above and below said member to limititssliding; said member havingat its; lowerend -agglandin ci eas ng; inIi ts colical I diameter from bottom to top, a sleeve abhve said gland face contacting p "slide tlifreo'nj nd a cyl ndricalon surfa v'ififhfliorfz ontalffeefli-vvliieh en the? in'fsidei'bfsaidpi ttvi hentliesl'ifi is lift ed theIsa I slidiiig' firig 'hziviiigfor eaeh strapa Wide "hcir'iz biit I I t p ernlittin' slight rotationof the ringawitht refereiicitbf 15' riiiIz irgYtio eciit outwardly f nfilar gfodvebein I I I I each": poriion having an escap hatchout new to 1 I the toiifof th'e frflemhei at 'its'hjeginning' a d: an slimme t I I closingmli gfo'dve' its end; saidsha having a rece'ss 20 cufifivvardlyQ f roni-its surtacegadetent tiivoted-in s drecess a'da jtd "t6" prniit the slida -ble' r fieml ier; to I slide upg wardydvet fit hut itoengage in's aid annular groove l a' ble n r eni ber' n r the top' of its traveI on theshan but perini ttlie said=mernbertd slide down ward t. A 21 i t flbi e l i g nsh a est al $1 1; a latch prn rnountedon thefshoulder at the top} ofs a'i d gland adapteclto pass' thr ough,said slot'when the lower .7 i a 1? t l d i s-t nse fsa th P sme i 9 a d-s eeve- 18 9 2 h li sl hsv r s d defnt w tact with-said abutnfent in-said ia'hnular; groove.

lidable member asset forth side of said sleeve and against'a second -aibutmentton t he 'wedgemin "holding-tits thin portion under the free end --of the Wiping-finger; but permitting the wedge pin ,to be moved-againstsaid springztoihring its thick-p'ortionunder said free end, the member-slidable-onsaidshank-beinghelovvsaid'gi ig against rotation; a -stop onsaid shanl; lief 71m s a idmengber to limit its sliding said slidalble" rfiemberlhaving at i ts aws; my a gland ineieasing its conical diaineter above said -g lnd havinglliy tori-ts entire length, and a iiiember of larger 'di'ainet'r above saidfsleev hang. s an its -toi ha-namin 'faceror contactin 'saidwex ige i 'girir'i'gsfac haviiiga key-way 'fdr "said key iiiei sfriPsQ-siid t wb slidin'g'fiingsfslidiiig "of {slips below said sleeve 'e' ldwe'r of aid sliding 'rifig's; I I V n-insr e s ur-faee contacting said gland to' fieriiiit the slip to" slidet hefeoh "an'd a cylindricaljou'tef sunset rbv'ided'witti ribr dma teemwhich engage-dia j nieifiber it s' escape hatchin alignment vv i thf' V g: restson said shoulder-land further adagted from' {the bottom I to top; -a sleeve 7 ii its surf ce, a detent pivoted in said recess adapted to perthe slidahle member to slide upward over it, but to engage in said annular groove to hold said 'slidable member near the top of its travel on the shank but permit the said member to slide downward when said member has its escape hatch in alignment with said detent, said lower sliding ring having a vertical slot, a latch pin mounted on the shoulder at the top of said gland adapted to pass through said slot When the lower sliding ring rests on said shoulder and further adapted to hold said lower 10 2,647,008

sliding ring when the ring is turned on said sleeve against the holding of said detent in contact with said abutment in said annular groove.

References Cited in the file of this patent UNETED STATES PATENTS Phipps July 6, 1937 Hammer Oct. 24, 1944 Stewart et al. July 28, 1953

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