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8/11/2019 US2463353.pdf http://slidepdf.com/reader/full/us2463353pdf 1/10 March 1, 1949. Filed June 6, 1944 L. C. C. BROWN ET AL 2,463,353 BUMPER SUBSAFETY JOINT U \VAYYQ WW N gW/AWAWAK V 5 Sheets-Sheet 1 32 3o 24 3/ 27 25' 2a, 2.2 35 328 24 34 2/ 23 20 .2. C’. C‘. BPow/v 650/7: (hwy. INVEN ORS. El 6CO7'78_ Y 4.; t 6 f m “J
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Page 1: US2463353.pdf

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M a r c h 1 , 1 9 4 9 .

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P a t e n t e dM a r . 1 , 1 9 4 92 , 4 6 3 , 3 5 3

U N I T E DS TAT E SPAT E N To r n c aBUMPER SUB SAFETY O IN T

C i c e r o C .B r o w n .H o u s t o n ,G e o r g e M c C r a y ,A l v i n ,a n d F l o y d L . S c o t t , J r . , H o u s ' o n .T e x . , a s s i g no r s t o B r o w n O i l Toolsc o r p o r a t i o n o f Texas

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A p p l i c a t i o nJ u n e 6 , 1 9 4 4 ,S e r i a lN o . 5 3 8 , 9 3 2

5 C l a i m s . ( 0 1 .255-47)1 .

T h i s i n v e n t i o n r e l a t e s g e n e r a l l y t o deep w e l la p p a r a t u s . a n d p a r t i c u l a r l y t o bum pers a n d s a f et y j o i n t s .

I t w i l l b e f o u n d p a r t i c u l a r ly u s e f u l i n connect i o n with r o t a r y d r i l l s t e m s , b u t i t may» a l s o b eu s e d i n connect ion with t u b i n g a n d other s t r i n g s .

A rotary d e e p w e l l d r i l l seldom, i f e v e r , d r i l l s at r u l y v e r t i c a l h o l e o r a h o l e f o l lo w i n g p r e d e t e rm i n e d c u r v e s . Th e u s u a l h o l e i s q u i t e c r o ok e d ,as a r e s u l t o f w h i c h the d r i l l s t e m often b e c o m e ss t u c k i n the h o l e a n d i t s r emova l i s d i i l l c u l t a n da t t i m e s i m p o s s i b l e .

Va r i o u s d e v i c e s have h e r e t o f o r e b e e n p r o v i d e dt o j a r t h e s t u c k p o r t i o n o f t h e d r i l ls tem t o l o o s e n

i t s o that the e n t i r e d r i l l s t e m a n d b i t may b er e m o v e d f r o m the h o l e . D e v i c e shave a l s o ' b e e nprovided t o pe rmi t severance o f the d r i l ls t e m a ta p o i n t above t h e s t u c k p o r t i o n , t o t h e e n d t h a tthe s e c t i o n s o f the d r i l l s t em ab o v e the stuckp o r t i o n may e removed. -

T h e d e v i c e s f o r j a r r i n g the p i p e l o o s e a r ek n o w n i n the a r t a s j a r s o r b u mp er s , a n d the d ev i c e s f o r s e v e r i n g t h e p i p e a b o v e t h e p o i n t a twhich i t c anno t b e j a r r e d l o o s e a r e k n o w n i n thea r t a s s a f e t y j o i n t s .

O n e o f the o b j e c t s o f t h i s i n v e n t i o n i s t o prov i d e a n e w a n d i m p r o v e d b u m p e r i n c l u d i n g e l ements which norma l ly c o n s t i t u t e a s t r o n g a n dr i g i d s e c t i o n o f t h e d r i l ls tem during d r i l l i n g o p

e r a t i o n s , a n d w h i c h , i n t h e e v e n t t h e d r i l l s temb e c o m e s stuck i n the h o l e , may e rendered mowa b l e with r e s p e c t t o each o t h e r b y a p r e d e t e rm i n e d u p w a r d p u l l o n the d r i l l stem, s o that thes t u c k p o r t i o n o f the s t e m may b e j a r r e d l o o s e .

Another o b j e c t o f t h i s i n v e n t i o n i s t o p r o v i d e an e w a n d i m p r o v e d s a f e t y j o i n t t o permit s e v e ran ce o f the d r i l l s t e m s hou ld i t b e i m p o s s i b l et oj a r l o o s e t h e s t u c k s e c t i o n , t h e j o i n t i n c l u d i n gm e m b e r s n o r m a l l y c o n n e c t e dt o g e t h e r t o p r o v i d ea r i g i d u n i o n d u r i n g d r i l l i n g o p e r a t i o n s , b u twh ich w i l l no t b e c o m e l o c k e d t o g e t h e r b u t o n thec o n t r a r y m a y be r e a d i l y d i s e n g a g e dt o p e r m i tseverance o f the d r i l l s t e m w h e n d e s i r e d .

This i n v e n t i o n a l s o has f o r i t s o b j e c t the prov i s i o n o f a new a n d ' i m p r o v e d co m b i n e d b u m p e ra n d s a f e t y j o i n t a s s e m b l ywhich m a y b e r e a d i l ya s s e mble d a n d disassembled a n d w h i c h when ssembled w i l l norma l ly c o n s t i t u t e a s t r o n g a n dr i g i d p a r t o f t h e d r i l l s tem d u r i n g d r i l l i n g o p e ra t i o n s b u t which m a y r e a d i l y a n d c e r t a i n l y ' b e

2a t a p o i n t above t h e s t u c k p o r t i o n t o permit t h er emova l o f t h a t p a r t o f the d r i l ls tem t h e r e a b o v e .

A u r t h e r o b j e c t o f t h e i n v e n t i o n i s t o p r o v i d en e w a n d i m p r o v e d m e a n s t o s e a l the o p e r a b l ee le me n t s a n d m e m b e r s o f t h i s n e w device 'andt h e r e b y p r e v e n t i n j u r y t o t h e p a r t s b y t h e mudl a d e n ?u id which i s u s u a l l y p u m p e d through t h ed r i l l stem.

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o p e r a t e d in t h e ev en t t h e d r i l l s t e m b e c o m e ss t u c k ? r s t t o j a r the s t u c k p o r t i o n o f the d r i l ls tem i n a n e f f o r t t o e f f e c t i t s r e l e a s e , a n d i n thee v e n t t h a t i s u n s u c c e s s f u lthen t o s e v e r t h e p i p e 55

I t i s a l s o a n o b j e c t o f t h i s i n v e n t i o n t o p r o v i d ea d e v i c e o f t h i s genera l type inc luding a n e w a n di m p r o v e d common m e a n s f o r p r e ve n t i ng the p rema t u r e o p e r a t i o n o f the b u m p e r a n d f o r p r ev e n t i n g t h e premature d i s c o n n e c t i o no f t h e r el e a s a b l e e l emen t s o f the s a f e t y j o i n t .

Anothe r o b j e c t i s t o prov ide su ch a d e v i c e i nwhich t h e s t r e s s e s a n d s t r a i n s o f d r i l l i n g w i l l n o tb e a l l owe d t o act u p o n the common m e a n s f o rp r e v e n t i n g o p e r a t i o n o f t h e j a r a n d g r a d u a l l yw e a k e n i t d u e t o f a t i g u e , a n d i n which t h e c o mmon m e a n s f o r p r e ve n t i ng the p r e m a t u r e o pe ra t i o n o f t h e j a r a n d s a f e t y j o i n t canno t be r el e a s e d u n l e s s a n d u n t i l the d r i l l s t e m has b ec o m e s t u c k i n t h e h o l e .

Other o b j e c t s a n d a d v a n t a g e so f t h i s i n v e n t i o nw i l lbecom e a p p a r e n t f rom t h e f o l l ow i n g d e s c r i pt i o n t aken i n c o n n e c t i o nwith t h e a c c o mp a n y i n gdrawings i n which o n e e m b o d i m e n t o f t h e i nv e n t i o n has been s h o w n b y wa y o f i l l u s t r a t i o n

a n d e x a m p l e .In the d r a w i n g :

F i g . 1 i s a view i l l u s t r a t i n g t h e l o w e r p o r t i o no f the d r i l l s t e m with a d r i l l b i t o n the lower e n dt h e r e o f , t h e s a m e b e i n g p o s i t i o n e d i n a h o l e b ei n g d r i l l e d i n a n e a r t h f o r m a t i o n .

F i g . 2 i s a n enlarged view p a r t l y i n l o n g i t u d i n a lc r o s s s e c t i o n a n d p a r t l y i n s i d e e l e v at i o n i l l u st r a t i n g t h e b u m p e r a n d s a f e t y j o i n t c o n s t r u c t e di n a c c o r d a n c e w i t h t h i s i n v e n t i o n .

F i g . 3 vi s a v i e w s i m i l a r t o t h e upper p o r t i o n o fF i g . 2 b u t o n a s u b s t a n t i a l l y l a r g e r s c a l e a n d h a vi n g a d d i t i o n a l p a r t s b r o k e n away and s how n i nc r o s s s e c t i o n f o r p u r p o s e so f i l l u s t r a t i o n .

F i g . 4 i s a view s i m i l a r t oFig . 3 but showingt h e l o w e r p o r t i o n o f t h e c o n s t r u c t i o n i l l u s t r a t e dinli‘ig. 2. .

F i g . 5 i s a v i e ws i m i l a r t o F i g . 3 but showing t h ep a r t s i n t h e r e l a t i o n which t h e y b e a r t o e a c h o t he r ‘ a f t e r t h e m e a n s f o r holding the b u m p e r a n ds a f e t y j o i n t i n o p e r a t i v eh a s b e e n r e l e a s e d a n d t h ed e v i c e i s i n p o s i t i o n f o r u se a s ‘ a b u m p e r a n d f o rr e l e a s e o f t h e s a f e t y j o i n t w h e n d e s i r e d .

F i g . 6 i s a view s i m i l a r t o F i g . 5 but showingt h e l o w e r p o r t i o n o f t h e dev ice . v

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2 , 4 6 8 , 8 5 8

F i g . 7 i s a t r a n s v e r s e c r os s s e c t i o n t a k e n ' a l o n st h e l i n e 1 - 1 o f F i g . 6 .

F i g . 8 i s a t r a n s v e r s e c r o s s s e c t i o n t a k e n a l o n g

t h e l i n e 3-8 f F i g . 6 .F i g . 9 i s a v iew s h o w i n g the lower p o r t i o n o f ad r i l ls t e m h av in g a d e v i c e c o n s t r u c t e di n accordance w i t h t h i s i n v e n t i o n i n c o r p o ra t e dt h e r e i n .a n d i l l u s t r a t i n g the m a n n e r i n which the lowerp o r t i o n o f the d r i l l s t e m may b e c o m e stuck i n aw e l l h o l e d u r i n g t h e p r o c e s s o f removal o f thed r i l l s t e m f r o m the h o l e .

F i g . 1 0 i s a v i ew s i m i l a r to F i g . 9 b u t i l l u s t r a t i n gt h e a p p a r a t u s a f t e r o p e r a t i o n o f t h e s a f e t y j o i n tf o r t h e p u rp o se o f d i s c o n n e c t i n gt h e upp e r port i o n o f t h e d r i l l s t e m f r o m the l o w e r p o r t i o nt h e r e o f .

F i g . 1 1 i s a t r a n s v e r s e c r o s s s e c t i o n t a k e n a l o n gt h e l i n e l l - I l o f F i g . 9 .

Refer r ing now m o r e i n d e t a i l t o the d rawings ,t h e n u me r a l l i n F i g . 1 d e s i g n a t e s the u s u a l

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t h e s e a l i n g r i n g I 5 i s a d a p t e d t o p r o t e c t t h eth readed z o n e s 9 a n d I I f r o m c o n t a c t with a n de r o s i o n b y t h e d r i l l i n g ?u id which i s p u m p e dthrough t h e d r i l ls tem d u r i n g t h e d r i l l i n g o p e r at i o n . T h e t o o l s e c t i o n s 1 a n d I 5 f o r m s a f e t yj o i n t c o n n e c t i n gm e m b e r s .

A b o v e t h e e lemen t 1 the p in m e m b e r 1 5 i s e x -t e n d e d u p w a r d l y a s u b s t a n t i a l d i s t a n c e a n d prov i d e d o n i t s o u t e r s u r f a c e with s p l i n e s l ' l . Abovet h e s p l i n e s i ‘ l i t has a p a r t o f r e l a t i v e l y l a r g ed i amet e r s h o w n at l 8 w h i c h Provides a n u pwardly f a c i n g s h o u l d e r a g a i n s t which i s d i s p o s e da s e a l i n g r i n g i a h e l d i n p l a c e b y a n u t 2 3th readed o n the e x t e r i o r o f t h e p in m e m b e r I S .T h e p u r p o s eo f t h i s s e a l i n g r i n g I w i l l p r e s e n t l ybe e x p l a i n e d . .

On t s u p p e r e n d , the p i n . m e m b e r I 5 i s p r o‘ , v i ' d e d wi t h a n ex ternal su rface w h i c h i s s l i g h t l y

rotary type o f d r i l l i n g b i t which i n the cu s to mary ‘

manner s mounted o n the lower e n d o f . a d r i l lc o l l a r o r d r i l l c o l l a r s 2 . 7v ' I ‘ h e s e d r i l l c o l l a r s arec a r ri e d p r e f e r a b l y b y a s h o r t length o f r i l l p i p e3 a n d o n the u p p e r e n d o f such leng th o f d r i l lpipe there i s m o u n t e d a d e v i c e 4 constructed i na c c o r d a n c e with t h i s i n v e n t i o n , t h e d e t a i l s o fwhich w i l l p r e s e n t l y b e d e s c r i b e d ‘ .

Secured t o the u p p e r e n d o f the d e v i c e 4 i s a no t h e r l e n g t h o f d r i l l p i p e 5 a n d other l e n g t h s 6may b e a d d e d t h e r e t o i n order t o make u p ther emain d er o f the d r i l l s t e m ex t en d i n g t o the s u rf a c e o f t h e e a r t h .

Refer r ing now more n d e t a i l t o the dev ice c o n

s t r u c t e d i n accordance with t h e p r e s e n t in v ent i o n , t h e r e i s s h o w n .i n F i g s . 2 t o 8 i n c l u s i v e thed e t a i l s o f c o n s t r u c t i o n t h e r e o f . I t w i l l b e seentha t there i s a n e l e m e n t o r s e c t i o n ‘ I w h i c h ha sa threaded p in 8 o n i t s lower e n d a d a p t e d t o b esecured t o the lower length o f d r i l l s t e m 3 a n dwhich s provided o n i t s u p p e r inner s u r f a c e witht w o t h re a de d zo n es 9 a n d I 0 . One o f the zo n es9 o r I I I , ( t h e z o n e 9 i n the case o f a t o o l f o r us ewith a d r i l l s t e m ad ap ted t o b e r o t a t e d c l o c kw i s e i n d r i l l i n g ) i s th readed with a r igh t-handt h r e a d , whereas the o t h e r z o n e I n i s th readedwith a lef t -hand t h r e a d . I t w i l l b e n o t e d thatthe th read ed zo n e 9 i s s l i g h t l y l a rg e r i n diametert h a n the t h re a de d z one I t . A ocking m e a n s inthe f o r r n ' o f a r i n g o r nut l l o f ‘ a s i z e t o ?t w i t h i nthe t h re a de d z one I l l a n d h a v i n g threads o n i t so u t e r s u r f a c e adap ted t o c o o p e r a t e with t h et h r e a d s I 0 i s p r o v i d e d w i t h i n t e r n a l s l o t s l 2 b ywhich i t 'may b e threaded i n t o t h e c o n n e c t i o n 1w i t h i n the th read ed zo n e I l l . B e y o n d i t s t h r e a d s .a n d a d j a c e n t i t s l o w e r e n d , t h i s r i n g I I i spro

. , v ld ed w i t h a smooth o u t e r z o n e a d a p t e d to re

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c e i v e a n d coopera te wi th the s e a l i n g r i n g l 3 car-r i e d i n a . s u i t a b l e g ro o v e w i t h i n , the e l e m e n t 1 s oa s t o prevent ?u id f r o m b e i n g f o r c e d ' i n t o t h espace b e t w e e n the r i n g I I a n d th e e lemen t 1from t h e l o w e r end o f t h e r i n g l l . ‘

On t s u p p e r e n d the r i n g I I i sprov ide d wi th a?ared s e a t l 4 adapted t o r e c e i v e a n d c l o s e l y s e a ta g a i n s t t he tapered e n d o f the ma n d r e l o r t o o ls e c t i o n I 5 . This ma n d r e l I 5 i s th readed e x t e rn a l l y a d j a c e n t i t sl o w e re n d t o e n g a g et h e t h r e a d s8 w i t h i n t h e e l ement ‘ I , a n d ab o v e such t h r e a d si s ‘ p r o v i d e d with a s m o o t h z o n e a d a p t e d . t o coo p e r a t e w i t h t h e s e a l i n g r i n g i t c a r r i e d w i t h i na s u i t a b l e g r o o v e i n t h e element 1 . The tapereds u r f a c e s o n the u p p e r e n d o f the r i n g H a n d thelower e n d o f t he p in l 5 a r e ad ap ted t o f o r m as e a l i n g c o n n e c t i o na g a i n s t e a c h o t h e r , an d t h i sc o n n e c t l o n ' t a k e n w i t ht h e s e a l i n g r i n g l 3 a n d

t a p e r e d toward i t s e n d a n d adap ted t o r e c e i v ea n d wedging ly engage w i t h i n t he c o r r e s p o n di n g l y t a p e r e d e n d p o r t i o n o f the uppe r connection 2 2 . >

. I n t e r n a l l y , the u p p e r e n d o f the p i n member‘ I5 i s th readed a t 2 3 t o r e c e i v e the lower threadede n d o f the h o l d i n g m e a n s i n the f o r m o f a frang i b l e member r s l e e v e 24 h a v i n g o n i t s u p p e r

‘ e n d a h e a d 2 5 with a d o w n w a r d l y f a c i n g e x t e r n a lshoulder 2 6 a d a p t e d t o e n g a g e a correspondings h o u l d e r within the u p p e r c o n n e c t i o n . 2 2 . S l o t so r s p l i n e s are p ro v i d ed o n the i n t e r i o r o f t h i ss l e e v e 2 4 with in the h e a d 25 as s h o w n a t 2 1 , s ot h a t a s u i t a b l e wrench may e i n s e r t e d t o t i g h t e nt h i s s l e e v e i n t o t h e t h r e a d s 2 3 a n d a g a i n s t t h es h o u l d e r 2 6 a n d thus hold the p i n m e m b e r I S i n

t i g h t e n g a g e m e n t with t h e u p p e r connection 2 2a t the tapered z o n e 2 | . T h e s l e e v e 2 4 i s p r o v i d e dwith a w e a k e n e d s e c t i o n f o r m e d i n a n y s u i t a b l emanner s u c h as b y means o f t h e ex ternal g r oove2 8 ,t h i s g r o ov e b e i n go f such depth a s t o p r e d et e rmine the s t r e s s necessary to b r e a k the s l e e v ea t t h i s p o i n t .

In o r d e r t o p r e v e n t the a c c i d e n t a l l o o s e n i n go f the s l e e v e 2 4 d u r in g d r i l l i n g o p e r a t i o n , a n ex

‘ t e r n a l l y t h r e a d e d r i n g 2 3 i s e n g a g e d w i t h s u i t a b l et h r e a d s 3 0 p r o v i d e df o r t h e purpose a n d t l g h t e n e da g a i n s t t h e h e a d 2 5 o f the r i n g 2 9 . T h e r i n g 2 9i s provided with g r o o v e s o r s p l i n e s i n t e r n a l lyt h e r e o f a s s h o w n a t 3 | so that t may e t ightenedi n t o p l a c e . I t w i l l b e noted t h a t the p i t c h o f t h et h r e a d s 3 0 i s s u b s t a n t i a l l y d i f f e r e n t f r o m t h a t o ft h e t h r e a d s 2 3 by which t h e s l e e v e 2 4 i s t h r e a d e di n t o t h e p i n i t , t h u s g r e a t l y i n c r e a s i n g t h e l o o ki n g e f f e c t o f t h e r i n g 2 3 because o f t h e f a c t t h a ti n order t o b a c k out o f i t s th r ead ed connect ion2 3 the s l e e v e 2 4 w o u l d h a v e t o t u rn a t a d i f f e r e n tr a t e f r o m t h a t a t which the r i n g 2 9 would havet o t u r n t o p e r m i t such b a c k i n go u t . There wouldt h e r e f o r e have t o b e s l i d i n g b e t w e e n the l o w e re n d o f t h e r i n g 2 9 and t he u p p e r e n d of t h e

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s l e e v e 2 4 i n o r d e r f o r t h i s t o o c c u r .T h e u p p e r e n d o f the u p p e r connect ion 2 2 i s

i n t e r n a l l y th r ead ed a t 3 2 f o r the purpose o fr e c e i v i n g t h e upper p o r t i o n o f ’t h e d r i l ls t e m .

E x t e r n a l l y a d j a c e n t i t s l o w e r e n d t h e upperco n n ec t i o n 2 2 has c onne c te d t h e r e t o a s l e e v e 3 3 ,th e s a m e b e i n g t h re a de d o n t o the u p p e r c o n n e ct i o n as s h o w n a t 34 a n d t h i s t h re a de d c o n n e ct i o n be ing s e a l e d i n a n y s u i t a b l e m a n n e r b y m e a n so f c e me n t such a s s h o w n a t 3 5 o r b y a n y others u i t a b l e m e a n s so as t o p rev en t l eak ag e b e t w e e nthe u p p e r connection 2 2 a n d the s l e e v e 3 3 .

Adjacent i t s ‘ lowerend , t h e s l e e v e 3 3 i s p r ov i d e dw i t h i n w a r d l y e x t e n d i n gs p l i n e s 3 1 a d a p t e dt o i n t e r e n g a g e with the s p l i n e s I ‘ o n t h e p inm e m b e r l 5 . whereby r o t a t i o n o f t h e s l e e v e 3 3

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5w i l l b e caused t o p ro d u ce r o t a t i o n o f t h e p i nm e m b e r I I , b u t whereby r e c i p r o c a t i n g m o v em e n t b e t w e e n t h e s e two p a r t s w i l l n o t b e i n t e rf e r e d w i t h . In o r d e r t o permit f r e e r e c i p r o c a ti n g m o v e m e n t without a n y h y d r a u l i c l o c k b etween t h e s e p a r t s a n o p e n i n g3 8 i s provided inthe s l e e v e 3 3 ab o v e the uppe r en d s o f the s p l i n e s3 1 . T h e u p p e r c onne c t i on 2 2 a n d the s l e e v e3 3 , t aken t o g e t h e r p r o v i d e a t o o l s e c t i o n c o n s t it u t i n g o n e o f t h e b u m p e r j a r r i n g elements whichmay b e r e f e r r e d t o a s the h a m m e r , w h i l e thet o o l s e c t i o n s ‘ I a n d I 5 , - t a k e n t o g e t h e r p r i o r t ot h e r e l e a s e o f t h e s a f e t y j o i n t , c o n s t i t u t e t h eo t h e r bumperv j a r r i n g e l e m e n t wh ic h - m a y b etermed the a n v i l . .

0n " h e lower e n d o f the s l e e v e 3 3 a n d providing a c o n t i nua t i o n o f the lower e n d o f e a c ho f the s p l i n e s 3 1 are a p l u r a l i t y o f c l u t c h t e e t h3 9 which p r o j e c t d o w n w a r d l y a n d a r e adap tedt o e n g a g e a n d ?t s n u g l y be tween t h e upward lyp r o j e c t i n g corresponding c l u t c h t e e t h 4 0 o n theu p p e r e n d o f the e l e m e n t ‘ I . I t w i l l b e s e e n thatw h e n the c l u t c h t e e t h 3 9 a n d 4 9 are i n t e r en g ag edthey w i l l f o r m a jaw c l u t c h e n g a g e m e n t b et w e e n the s l e e v e 3 3 a n d the e l e m e n t ‘ I s o thatt h e s l e e v e 3 3 may b e e mp l o y e d t o d r i v e t h e e l em e n t ‘ I d i r e c t l y i n r o t a r y m o v e m e n t i n e i t h e rd i r e c t i o n . I t w i l l further b e seen tha t the s l e e v e3 3 w i l l b e h e l d i n . i t s lo w ermo s t p o s i t i o n withrespect t o t h e e l e m e n t ‘ I so tha t the teeth 3 9

e a c h o t h e r so l o n g a s t h e p i n ‘

i n the s a f e t y j o i n t b o x e lemen t ‘ I a n d the s l e e v e2 4 i s t i g h t e n e d i n t o i t s t h r e a d s 2 3 . I t w i l l f u rt h e r b e seen that w h e n t h e tapered s u r f a c e s o n 'the u p p e r e n d o f the r ing I I a n d the lower e n do f the p in e lemen t I 5 a r e i n t i g h t e n g a g e m e n twith each o t h e r a f t e r h av in g b e e n b ro u g h t i n t os uc h t i g h t e n g a g e m e n t b y m e a n s o f a w r e n c hen g ag eab le w i th the s p l i n e s o r s l o t s l 2 p r e v io u s l y mentioned , such e n g a g e m e n t w i l l not i nt e r f e r e with the ready r e l e a s e o f the p in memb e r I f r o m t h e s a f e t y j o i n t b o x m e m b e r ‘ I b ecause w h e n the p i n member I 5 i s rotated to w ardthe l e f t t o d i sen g ag e i t f r o m the b o x m e m b e r‘ I , a s i m i l a r r o t a t i o n o f the r i n g I I w i l l b e p e rmitted w i t h i n i t s l e f t - h a n d thread I I I ,t h i s r o t at i o n t e n d i n g t o m o v e t h e r i n g l l downward lya n d away f r o m t h e p i n l 5 . Thus . there w i l l b e ‘

n o n e c e s s i t y f o r f r i c t i o n al s l i d i n g o f o n e o f t h e s etapered s u r f a c e s over the o t h e r .

In the assemb ly o f the d e v i c e ab o v e d e s c r i b e d .t h e s e a l i n g r i n g w i l l f i r s t b e s e c u r e d i n p l a c eo n t h e p i n m e m b e r I 5 b y m e a n s o f t h e _ n u t . 2 9a n d the pin m e m b e r 1 5 w i l l th en be p la c e d i n t ot h e s l e e v e m e m b e r 3 3 f rom t h e upper e n d t h e r eo f . T h e r e u p o n t h e u p p e r connect ion 2 2 w i l l bet h readed i n t o t h e u p p e r e n d o f t h e s l e e v e 3 3 b ym e a n s o f the th reads 3 4 . a n d the cement i t iousmater ia l 35 app l ied o r o ther s e a l i n g m e a n s e m —p l o y e d t o f o r m a s e a l be tween t h e s e p a r t s a n dp r e v e n t t h e i r r e a d y ' d i s e n g a g e m e n tf rom e a c ho t h e r . At t h i s p o i n t i t i s a d v i s a b l e t o i n s e r t t h es l e e v e 2 4 t h rough t h e upper c o n n e c t i o n 2 2 a n d

t i g h t e n i t i n t o t h e threads 2 3 t o d r a w the taperedj o i n t 2 | t o g e t h e r a n d t h e n p l a c e a g a u g e m a r ko n the o u t e r ‘ s u r f a c e o f the p i n s e c t i o n I 5 atthe lower e n d o f o n e o f the teeth 39 t o serve asa g u i d e i n t h r e a d i n g t h e p i n s e c t i o n 1 5 i n t o t h eb o x s e c t i o n ‘ I . S l e e v e 2 4 m u s t t hen b e r e mo v e dt o p ermi t the pin l 5 t o b e ex ten d ed b e y o n d t h es l e e v e 33 so that i t c a n b e sc r ewed i n t o b o x - ‘ I .

T h e r i n g I I w i l l then b e t h r e a d e d l y e n g a g e dwith the th readed zone I 9 w i t h i n t h e s a f e t y j o i n tb o x _ e l e m e n t ‘ I a n d s c r e w e ddownwardly t o t h e

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lower e n d o f the th r ead ed en g ag emen t , a f t e rwhich t h e p in m e m b e r l 5 w i l l b e i n s e r t e d i n t othe b o x e l e m e n t 1 a n d screwed i n t o the s a m e

u n t i l the g a u g e m a r k o n the p in s e c t i o n i s f a i r l yv i s i b l eb e t w e e ntwo o f t h e t e e t h 4 9 ,b e i n g s t o p p e da t such a p o s i t i o n that t h e t e e t h 3 9 a n d 4 0 w i l lin terengage with each o t h e r . T h e s l e e v e 3 3 w i l lt hen be m o v e d t oward t h e b o x e lemen t ‘ I u n t i lt h e t e e t h 3 9 a n d 4 0 a r e f u l l y i n t e r e n g a g e d .

Wi t h t h e t e e t h 3 9 a n d 4 0 f u l l y e n g a g e d w i t heach other the s l e e v e 2 4 w i l l th en b e i n t r o d u c e df r o m the u p p e r e n d o f the u p p e r ‘ connect ion 2 2a n d t h r e a d e d l y engaged a t 2 3 w i t h t h e p i n l 5a n d t h e n t igh tened s o a s t o d r a w the tapereds u r f a c e s a t 2 | i n t o t i g h t e n g a g e m e n t w i t h eacho t h e r a n d f a i r l y r i g i d l y h o l d t h e p i n m e m b e r I Si n e n g a g e m e n t with the u p p e r c o nne c t i on 2 2 .The r i n g 2 9 w i l l then b e i n s e r t e d a n d t i g h t e n e d

a g a i n s t the h e a d 2 5 o f the s l e e v e 2 4 t o hold t h es l e e v e a g a i n s t a c c i d e n t a l d i s p l a c e m e n t , a f t e rwhich t h e r i n g i i w i l lb e ‘ t i g h t e n e d a g a i n s t t h el o w e r e n d o f p in I 5 t o l o c k t h e p i n r i g i d l y a g a i n s t ‘screwing f u r t h e r i n t o t h e b o x I but without o f f e ri n g g r e a t r e s i s t a n c e t o i t s r e a d y r e m o v a l f romthe b o x I onc e the te e th 3 9 a n d 4 0 are d i sen g ag edfrom each ther . v ’ .

I t w i l l b e ‘ seen tha t w h e n the d e v i c e j u s t des c r i b e d . i s a s s e m b l e d in t h e manner o u t l i n e d , i tw i l l s uppor t a l o ad w h i c h does no t exceed thestrength o f the w e a k e n e d s e c t i o n 2 8 o f the s l e e v e2 4 , a n d t h i s s e c t i o n w i l l b e s o designed that i tw i l l v s u p p o r t a l o ad s o m e w h a t exceeding t h eweight o f the d r i l l s tem wh ich i s t o b e co n n ectedt o the l o wer e n d o f t h i s d e v i c e . So l o n g a s the

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s l e e v e 2 4 remains i n t a c t a n d i n t h e p o s i t i o ni l l u s t r a t e d i n F i g s . 2 , 3 a n d 4 , the teeth 3 9 a n d -4 9 w i l l b e held i n e n g a g e m e n t with each o t h e rs o that torque may b e transmitted f r o m the u pp e r c o n n e c t i o n 2 2 through t h e s l e e v e 3 3 t o t h es a f e t y j o i n t b o x e l e m e n t‘ I b y m e a n s o f t h e t e e t h3 9 a n d 4 9 . I t w i l l b e n o t e d ‘ t h a t whereas t h ethreads 9 a n d I I I w o u l d no t i n t e r f e r e with thel e f t - h a n d r o t a t i o n o f t h e p i n e lemen t l 5 f o r t h er e a s o n s a b o v e s t a t e d , t h e y w i l l d e ? n i t e l y l o c kt h e p i n e l e m e n t I 5 a g a i n s t r i g h t - h a n d r o t a t i o nwithin the b o x e lemen t ‘ I because such r i g h th a n d r o t a t i o n w o u l d t e nd t o m o v e the e le me n tI 5 a n d t h e r i n g l l toward each o t h e r a n d t h e yw o u l d thus c o m e i n t o l o c k i n g e n g a g e m e n t witheach o t h e r . I t w i l l f u r t h e r b e s e e n ' t h a t t o r q u emay b e t r a n s m i t t e d f r o m the s l e e v e 3 3 t h rough

3 the i n t e r e n ga g i n g s p l i n e s I I a n d 3 1 t o t h e p i ne l ement l 5 a n d thence through t h e threadede n g a g e m e n t 9 a n d I I ) t o t h e b o x v e lemen t ‘ I .

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c e p t i o n o f t h e s l e e v e 2 4 t en d t o c o n t r i b u t e t othe t ransmiss ion o f to rque f r o m the u p p e r c onn e c t i o n 2 2 t o t h e s a f e t y j o i n t b o x e l e m e n t ‘ I .

I t i s t o b e n o t e d , h o w e v e r , t h a t t h e s l e e v e2 4 w i l l b e s u b s t a n t i a l l y v p ro t e c t e d f r o m a l l s u c hs t r e s s e s d u e t o t o r q u e a n d a l s o due t o ' b e n d i n gs t r e s s e s ’e n c o u n t e r e di n d r i l l i n g o p e r a t i o n s b ecause the w e i g h t o r the d r i l l s t e m u p o n the

u p p e r c onne c t ion 2 2 w i l l t e nd a t a l l t imes t om o r e f u l l y e n g a g e t h e t a p e r e d s u r f a c e s a t 2 ia n d thus r e l i e v e a n y t ens ion o n the s l e e v e 2 4r a t h e r than p l a c i n g a d d i t i o n a l t e n s i o n t h e r e o n .v A tthe v s a m e t i m e , the t i g h t e n g a g e m e n t o f t h et a p e r e d s u r f a c e s 2 a n d t h e r e l a t i v e l y l o n g s l e e v e33 w i l l t e n d t o r e m o v e a n y b e n d i n g s t r e s s e s f r o mt he s l e e v e 2 4 a n d cause t h e m t o b e t ransmit ted

. d i r e c t l y from‘ the p i n e l e m e n t i i t o the u p p e r

7 6c o n n e c t i o n ' 2 2 w i t h o u t p a s s i n g t h r o u g h t h es l e e v e 2 4 .

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I t has been foun d t h a t i n d r i l l i n g o p e r a t i o n sw i t h t h e d e v i c e d e s c r i b e d b u t wi thout t h e p r e sence o f the r i n g 2 3 there w a s s o m e t en d en cy f o r

t h e s l e e v e 2 4 t o b a c k out a n d e v e n t u a l l y b e c o m ed i s e n g a g e dp r e m a t u r e l y , b u t t h a t with t h e l o c k —i n g r i n g 2 3 i n p l a c e t h i s t endency w a s overcome.

I t w i l l f u r t h e r b e seen that l eak ag e f r o m thei n t e r i o r o f the d r i l l s t e m a n d o f the dev icei l l u s t r a t e d a n d d e s c r i b e d w i l l b e p r e v e n t e d b yt h e t i g h t t a p e r e d engagem en t a t t h e p o i n t 2 | ,a n d b y t h e s e a l i n g r i n g I a d j a c e n t t h e r e t o .F u r t h e r m o r e ,t h e l e a k a g e f r o m t h e l o w e r p o r t i o no f t h e d e v i c e w i l l b e e f f e c t i v e l y p r e v e n t e d b ym e a n s o f the s e a l i n g r i n g s l 3 a n d i 3 a n d thee n g a g e m e n t be tween the t a p e r e d s u r f a c e s a t I I .I t i s f u r t h e r t o be no ted that t h e s e l a s t s e a l i n gm e a n s e f f e c t i v e l y prevent the a c c e s s o f the d r i l li n g ?u id t o the th readed z one s 3 a n d I 0 o f thes a f e t y J o i n t , a n d t h i s i s o f g r e a t impor tancebecause o f t h e f a c t that i t i s impera t ive t h a tt h e s e t h r e a d s b e r e a d i l y o p e r a b l e w h e n i t i sd e s i r e d t o disconnect the u p p e r p o r t i o n o f thed r i l l s t e m f r o m the lower e n d t h e r e o f .

Reference i s n o w h a d t o F i g s . 9 , 1 0 a n d 1 1 i nw h i c h are i l l u s t r a t e d the cond i t ions u n d e r w h i c hmany t imes a d r i l l s t e m w i l l b e c o m e s tuck i na w e l l .

D e s p i t e t h e t a k i n g o f a l l p o s s i b l e p r e c a u t i o n sa n d the us e o f s u i t a b l e d r i l l c o l l a r s a n d otherapparatus a v a i l a b l e , w e l l h o l e s a r e s e l d o m d r i l l e de x a c t l y s t r a i g h t . R a t h e r , t h e y u s u a l l y b e n d a n dt w i s t a b o u t i n t h e i r d o w n w a r d course t o a greatero r l e s s extent e v e n t h o u g h they may n o t deviatef r o m t h e d e s i r e d d r i l l i n g d i r e c t i o n b y a n y very

g r e a t d i s t a n c e . During t h e v d r i l l i n go p e r a t i o nt h e d r i l l s tem r e a d i l y f o l l o w s such c r o o k s a n dc u r v e s i n the w e l l h o l e be c a us e a l o n g leng tho f d r i l l s t e m t h o u g h made o f s t e e l i s r e l a t i v e l yq u i t e ? e x i b l e . However, d u r i n g t h e r o t a t i o n o fthe d r i l l s t e m i n d r i l l i n g i t t en d s t o w e a r m o r eagainst the i n s i d e o f a cu rv ed por t ion s u c h asi l l u s t r a t e d a t 4 | a n d t o s t r a i g h t e n u p such curvedp o r t i o n o f the h o l e a s d r i l l i n g p r o c e e d s . I t w i l lb e n o t e d , h o w e v e r , t h a t t h i s s t r a i g h t e n i n g u po p e r a t i o n i s c a r r i e d out b y wear o f t h e s i d e o fthe d r i l l s tem a g a i n s t the s i d e w a l l o f the h o l e ,a n d t h a t t h e d r i l l s t e m i s o f s u b s t a n t i a l ly l e s sd i amet e r t h a n e i t h e r the d r i l l b i t o r the d r i l lc o l l a r s . Thus, w h e n the d r i l l s t e m t e nds t os t r a i g h t e n the h o l e i t fo rms a r e l a t i v e l y n a r r o ws l o t t e d p o r t i o n such a s i l l u s t r a t e d a t 4 2 i n thedrawing a n d a f t e r a l o n g t ime the d r i l l s t e m w i l lb e found t o ex tend through t h i s s l o t t e d p o r t i o ni n which i t w i l l o p e r a t e s a t i s f a c t o r i l y but whichs l o t t e d p o r t i o n i s narrower t h a n th e d iamete ro f t h e d r i l lb i t a n d r i l l c o l l a r s .

I t w i l l b e o b v i o u s that w h e n a n a t temp t i smade t o r e m o v e f r o m s u c h a ho l e a d r i l l s t e mo f the nature s e t f o r t h , the d r i l l c o l l a r s a n d d r i l lb i t w i l l t end t o b e d r a w n ‘upwardly i n t o t h enarrow p o r t i o n 4 2 o f the h o l e which i s o r d i n a r i l yr e f e r r e d t o as a k e y s e a t . I n a s m u c h as theya r e o f t o o g r e a t diameter t o pass t h r o u g h t h i sr e l a t i v e l y nar row p o r t i o n o f t h e h o l e t h e r e i s

g r e a t l i k e l i h o o d t h a t t h e y w i l l b e c o m e s t u c kt h e r e i n r a t h e r than b e i n g d e ? e c t e d s i d e w a y sthrough t h e c u r v e d p o r t i o n l l o f t h e h o l e whichi s o f l a r g e r d i a m e t e r .

Wi t h a d e v i c e constructed in accordance witht h e p r e s e n t i n v e n t i o n i n c o r p o r a t e di n t o the d r i l ls tem a s h o r t d i s t a n c e above the d r i l l c o l l a r s , i ti s p o s s i b l e t o cope with such a s i t u a t i o n i n thefollowing manner:

B e f o r e e x e r t i n g a n u p w a r d p u l l o n t h e d r i l l

20

2 5

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4 5

50

6 0

6 5

7 0

7 6

p i p e sumcient t o break t h e s l e e v e 2 4 a t t h e p o i n t2 8 . i t m a y b e p o s s i b l e b y p l a c i n g t h e w e i g h t o fthe u p p e r e n d o f the d r i l l s t e m o n the lower

p o r t i o n t h e r e o f , through m e r e l y s l a c k i n g o f f o nt h e h o i s t i n g appara tus a t t h e s u r f a c e o f t h ee a r t h , t o l o o s e n t h e d r i l ls tem f r o m the k e y s e a ta n d t h e n work i t o u t b y g r a d u a l l y r o t a t i n g i twhi le l i f t i n g i t in order to cause i t t o w o r k i t sw a y p a s t t h e key s e a t 4 2 . However, i f t h e d r i l ls t e m d o e s no t c o m e l o o s e b y v i r t u e o f i t s o w nw e i g h t b e i n g p l ac e du p o n i t t h e b u m p e r o p e ra t i o n t o J a r t h e s tem l o o s e may e e f f e c t e d . Thisi s e?ected b y p u l l i n g upward ly o n t h e d r i l ls temu n t i l s u f f i c i e n t f o r c e i s exer ted t o b r e a k the s l e e v e2 4 a t the p o i n t 2 8 . When h i s o c c u r s , i t w i l l b es e e n that the s l e e v e 33 w i l l b e l e f t f r e e t o m o v eupward ly with r e s p e c t t o t h e p i n e l ement i 5 a n dwith r e s p e c t t o t h e b o x e l ement ‘ I , t h e r e b y sepa r a t i n g t h e t e e t h 3 9 a n d 4 0 . These t e e t h , h o we v e r , w i l l b e r e t a i n e d i n a l ig n men t w i th eacho t h e r b e c a u s e o f t h e l o c k i n g e f f e c t o f t h e r i n gl l u p o n the p in e lemen t I S . T h e u p p e r p o r t i o no f the d r i l l s t e m may th en b e l i f t e d t o the e xt e n t o f m o v e m e n t o f the s l e e v e 3 3 u p o n the p i ne lemen t I t a n d su d d en ly d r o p p e d t o cause thelower e n d o f the s l e e v e 3 3 t o hammer a g a i n s t ‘t h e u p p e r e n d o f t h e b o x e l ement ‘ I , a n d thelower e n d o f the u p p e r co n n ec t i o n 2 2 t o hamm e r a g a i n s t the u p p e r e n d o f t he p in e lemen tI t . This h a m m e r i n g can b e repeated a n y d es i r e d n u m b e r o f t imes i n a n e f f o r t t o hammerthe lower p o r t i o n o f the d r i l l s t e m l o o s e f r o mi t s s t u c k p o s i t i o n w i t h i n t h e key s e a t 4 2 .

I f i t b e f o u n d i m p o s s i b l e t o l o o s e n the s t u c k

lower p o r t i o n o f the d r i l l s tem f r o m within t h ekey s e a t 4 2 , then t h e s a f e t y j o i n t o p e r a t i o n m a yb e e f f e c t e d to c a us e a severance o f the p i p e a b o v ethe stuck p o r t i o n . To e f f e c t su ch s e v e r a n c e , theo p e r a t o r w i l l t hen r o t a t e the uppe r p o r t i o n o fthe d r i l l s t e m t o the l e f t while the s l e e v e 3 3i s b e i n g h e l d i n s o m e p o s i t i o n a b o v e i t s lowerm o s t p o s i t i o n s o that the t e e t h 33 a n d l l w i l lb e d i s e nga ge d f r o m each o t h e r . Wi t h t h e s et e e t h d isen g ag ed f r o m each o t h e r the p in I Iw i l l b e f r e e t o t u rn with in the b o x e l e m e n t 1e x c e p t f o r t h e e n g a g e m e n t with t h e r i n g I I , b u ta s above s t a t e d , t h i s e n g a g e m e n t w i l l n o t s u bs t a n t i a l l y hinder l e f t - h a n d r o t a t i o n o f t h e p i ni t with in the b o x 1 be c a us e such r o t a t i o n w i l lt en d t o m o v e apart the e leme nts l 5 a n d I I . I t

w i l l b e r e a d i l y appa ren t t h a t b y continued r ot a t i o n t o the l e f t t h e u p p e r p o r t i o n o f the d r i l ls t e m may t h u s b e r e a d i l y disconnected f r o m thel o w e r p o r t i o n t h e r e o f b y d isengagemen t o f t h ep in e lemen t i 5 f r o m the b o x e l ement ‘ I a t thethreaded e n g a g e m e n t 9 . The u p p e r p o r t i o n o ft h e d r i l l s t e m with the s l e e v e 3 3 may t h e n b er e m o v e d f r o m the h o l e a s i l l u s t r a t e d i n F i g . 1 0 .

A f t e r such d i sengagement a n d r emova l i t i sp o s s i b l e t o r u n a d i f f e r e n t s o r t o f t o o l known asa washove r ?sh in g t o o l ( n o t s h o w n i n t h i s a pp l i c a t i o n ) i n t o the w e l l a n d w a s h d o w n over theu p p e r e n d o f the s tuck d r i l l p i p e u n t i l i t i s r eleased from ts stuck position. ' 7 ~

While t h e e l e m e n t smay b e r e a d i l y a n d c e r

t a i n l y operated a s above i n d i c a t e d w h e n a p i p eb e c o me s s t u c k , they a r e assembled a n d held t og e t h e r t o f o r m a s t r o n g a n d r i g i d p a r t o f t h ep i p e d u r i n g d r i l l i n g o p e r a t i o n . Thus i t w i l l b eseen that a s l o n g a s the s l e e v e 2 4 r e m a i n s i nt a c t , t h e p i n e l ement I w i l l be h e l d i n t i g h te n g a g e m e n t a t 2 | with t h e upper c o n n e c t i o n

‘ 2 2 , a n d tha t t h i s w i l l h o l d t h e s l e e v e 33 in i t sl o w e r m o s tp o s i t i o n with r e s p e c t z t o t h e p i n e l em e n t i t . i n which p o s i t i o n t h e t e e t h o r d o g s 3 3 '

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2,468,858 ‘

a n d 4 0 w i l l b e i n f u l l e n g a g e m e n t with eacho t h e r . T h i s e n g a g e m e n t be tween t h e d o g s 3 9a n d 4 0 w i l l prevent r e l a t i v e r o t a t i o n o f t h es l e e v e 3 3 a n d t h e b o x e l ement ‘ I , a n d i n a s mu c h

a s the p i n e lemen t 1 5 a n d t h e s l e e v e 3 3 canno tr o t a t e with r e s p e c t t o each o t h e r b e c a u s e o f t h ei n t e rengagement o f t h e s p l i n e s 1 1 a n d 3 1 , t h i se n g a g e m e n t be tween t h e dogs 3 9 a n d 4 0 w i l lp r e v e n t di sengagement o f t h e p i n element l 5f r o m the b o x e lemen t 1 . Th e s l e e v e 2 4 w i l l thush o l d t h e s l e e ve 3 3 a n d t h e p i n e l e m e n t 1 5 a g a i n s tr e l at i v e s l i d i n g e n g a g e m e n t with each o t h e r u nt i l the s l e e v e 2 4 has b e e n b r o k e n , a n d thus t h e r ec a n b e n o h a m m e r i n g o f the lower e n d o f thes l e e v e 3 3 against the u p p e r e n d o f the b o x memb er ‘ 1 u n t i l a f t e r the s l e e v e 2 4 h as b een b r oke n .L i k e w i s e , there c a n b e n o d i s e n g a g e m e n t o f thelower e n d o f the p i n e le me n t l 5 f r o m the b o xe le me n t 1 u n t i l a f t e r the s l e e v e 2 4 h as b eenbroken -

On t h e o t h e r hand, t h e s l e e v e 2 4 canno t b eb r o k e n merely b y t h e w e i g h t o f t h e d r i l l c o l l a r sa n d d r i l l i n g t o o l s suspended t h e r e f r o m b e c a u s ei t i s s o des ignedas t o support c o n s i d e r a b l ym o r ethan the weighL o f such p a r t s . I t can n o t b eb r o k e n d u r i n g t h ed r i l l i n g o p e r a t i o n b e c a u s eduri n g t h e d r i l l i n g o p e r a t i o n w e i g h t i s p l a c e d u p o nthe d r i l l i n g t o o l f r o m a b o v e d u e t o the u p p e r port i o n o f the d r i l l s t e m a n d the d e v i c e constructedi n accordance with t h i s invent ion w i l l b e i n comp r e s s i o n d u r i n g t h e d r i l l i n g o p e r a t i o n . Therew i l l thus b e n o tension a v a i l a b l e t o b r e a k thes l e e v e 2 4 . L i k e w i s e , t h e s l e e v e 2 4 cannot b ec o m e f a t i g u e d d u e t o b e n d i n g s t r e s s e s d u r in g t h ed r i l l i n g o p e r a t i o n b e c a u s e o f t h e t a p e r e d e ng a g e m e n t a t 2 | a n d because o f the r emain d er o fthe c o n s t r u c t i o n which s u b s t a n t i a l l y r emo v esf r o m the s l e e v e 2 4 a l l o f the s t r e s s e s a n d s t r a i n so f d r i l l i n g .

There has t h e r e f o r e b e e n prov ided a t o o l whichi s c a p a b l e o f a c c o m p l i s h i n ga l l o f t h e o b j e c t s a n dadvantages s e t f o r t h i n c o n n e c t i o n with t h i si n v e n t i o n .

H a v i n g d e s c r i b e d our i n v e n t i o n , w e c l a i m :1 . A u m p e r sub a n d s a f e t y j o i n t with a ?u id

p a s s a g e w a yt h e r e t h r o u g h h a v i n gt e l e s c o p i n gt ub u l a r s e c t i o n s adap ted f o r r e l a t i v e l o n g i t u d i n a la n d r o t a t i v e movement, c o o p e r a t i n gj a r r i n g e l eme n t s c a r r i e d b y s a i d s e c t i o n s , a c l u t c h b e t w e e ns a i d s e c t i o n s p r e v e n t i n g t h e i r r e l a t i v e r o t a t i o n

w h e n e n g a g e d ,a n d a t u b u l a r f r a n g i b l e m e m b e rm o u n t e d b e t w e e n the s e c t i o n s t o ho ld t h e ma g a i n s t r e l a t i v e l o n g i t u d i n a l movement , s a i dmember serv ing a s b o t h a f r a n g i b l e m e a n s f o rh o ld i n g t h e s e c t i o n s i n t e l e s c o p e d r e l a t i o n s h i pa n d a s a p o r t i o n o f the ?u id p assag ew ay th ro u g ht h e j o i n t .

2 . A e v i c e a s i n claim 1 i n which the m o u n ti n g o f t h e t u b u l a r f r a n g i b l e m e m b e r c o m p r i s e sa t h re a de d connect ion with o n e s e c t i o n a n d c o r

1 0

1 5

20

25

30

35

10r e s p o n d i n gs h o u l d e r s be tween t h e m e m b e r a n dt h e o t h e r s e c t i o n , s a i d s h o u l d e r s adap ted t o abuto n t e l e s c o p e d a s s e mbly o f the t o o l a n d a l o c kn u t th r ead ed t o s a i d l a s t s e c t i o n a n d en g ag in g

s a i d m e m b e r .3 . A b u m p e r s u b a n d s a f e t y j o i n t with a f l u i dpassageway t h e r e t h r o u g h h a v i n g t e l e s c o p i n g t ub u l a r - s e c t i o n s adapted f o r r e l a t i v e l o n g i t u d i n a la n d r o t a t i v e movement , c o o p e r a t i n g j a r r i n g e l e

me n t s c a r r i e d b y s a i d s e c t i o n s , a c l u t c h b e t w e e ns a i d s e c t i o n s p r e v e n t i n g t h e i r r e l a t i v e r o t a t i o nw h e n e nga ge d , a t u b u l a r f r a n g i b l e m e m b e rm o u n t e d b e t w e e n t h e s e c t i o n s t o ho ld t h e ma g a i n s t r e l a t i v e l o n g i t u d i n a l m o v e m e n t , s a i dmember serv ing as b o t h a f rangib le m e a n s f o rh o l d i n g t h e s e c t i o n s i n t e l e s c o p e d r e l a t i o n s h i pa n d as a port ion o f the ? u i d p a s s a g e w a y t h r o u g ht h e j o i n t , a n d a tapered w e d g e - l i k ej o i n t b e t w e e nt h e s e c t i o n s adap ted t o t r a n s m i t t h e b e n d i n gs t r e s s e s d i r e c t ly be tween t h e s e c t i o n s w h e n t h e ya r e t e l e s c o p e d t h u s r e l i e v i n g t h e f r a n g i b l e member f r o m s a i d s t r e s s e s .

4 . In a b u m p e r su b a n d s a f e t y j o i n t havingt e l e s c o p i n g s e c t i o n s adapted f o r r e l a t i v e l o n g it u d i n a l a n d r o t a t i v e m o v e m e n t , a c l u t c h b e t w e e nthe s e c t i o n s o p e r a b l e o n e n g a g e m e n t t o hold t h es e c t i o n s a g a i n s t r e l a t i v e r o t a t i o n w h e n they a r et e l e s c o p e da n d a tubular f r a n g i b l e member hold—i n g t h e s e c t i o n s i n t e l e s c o p e d r e l a t i o n s h i p w i t hthe c l u t c h e n g a g e d the i m p r o v e m e n t w h i ch r es i d e s i n a tapered w e d g e - l i k ej o i n t be tween t h es e c t i o n s adapted t o t r a n s m i t t h e bend ing s t r e s s e sd i r e c t l y b e t w e e n the s e c t i o n s w h e n t h e s e c t i o n sa r e t e l e s c o p e d t h u s r e l i e v i n g t h e f r a n g i b l e member t h e r e f r o m .

5 . A e v i c e a s i n c l a i m 4 , wherein the w e d g el i k e j o i n t c o m p r i s e sa n i n t e r n a l annu la r t a p e r e dsh o u ld e r o n o n e s e c t i o n a n d a n exte rna l a n n u l a rt a p e r e d s h o u l d e ro n t h e o t h e r s e c t i o n , s a i d s h o u ld e r s adap ted t o ?t snugly w h e n t h e s e c t i o n s a r et e lescoped a n d the clutch e n ga ge d . "

- CICERO C. BROWN

GEORGE McCRAY.FLOYD . S C OTT, J a .

REFERENCES CITED

T h e f o l l o w i n g r e f e r e n c e s are o f record i n thet i l e o f t h i s p a t e n t :

UNITED STATES PATENTSNumber Name - Date

1,796,611 Montgomery ____ -_ M a r. 1 7 , 1 9 3 01,839 ,690 Malenowski _ _ _ _ _ _ _ _- J a n . 5 , 1 9 3 21,855,363 P e t e r s o n . . . . . . . . __ A p r. 2 6 , 1 9 3 21 , 982 , 915 Jenks _ _ _ _ _ _ _ _ _ _ _ _ _ __ D e c . 4 , 1 9 3 41,989,907 Beck ____________ _ F e b . 5 , 1 9 3 52,029,609 Burns e t a l . ______ __ F e b . 4 , 1 9 3 6

- 2 , 049 , 290 Burns e t a l . _ _ _ _ _ _ . - J u l y 28, 1 9 3 6