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Патент USA US3061020

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Oct. 30, 1962
M. B. CONRAD ETAL
3,061,010
LOCATOR FOR COLLARS JOINING PIPE LENGTHS
Filed Aug. 15, 1958
4 Sheets-Sheet l
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Oct. 30, 1962
M. B. CONRAD ETAL
3,061,010
LOCATOR FOR COLLARS JOINING PIPE LENGTHS
Filed Aug. 15, 1958
4 Sheets-Sheet 3
45’
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20,
27
24
26
IINVENTORS.
Menu B. 60/1/1640
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3}’ 7/7444; “Ma/1564M)
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Oct. 30, 1962
M. B. CONRAD ETAL
3,061,010
LOCATOR FOR COLLARS JOINING PIPE LENGTHS
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44%144pW4 4
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4770244575. .
United States Patent O?ice
1
3 ,06 1,010
Patented Oct. 30, 1 962
2
FIG. 5 is a fragmentary view similar to FIG. 3 but
3,061,010
illustrating a dog in active tilted position, cooperating
LO-CATUR FER CULLARS JOINTNG
with the upper edge of a pipe length;
PIPE LENGTH-IS
FIG. 6 is a view similar to FIG. 4, illustrating a dog
Martin B. Conrad, Downey, and John B. McElheny, 5
of the ?rst set in tilted active position and capable of
Fullerton, Calif; said Conrad assignor to said Mc
cooperating with the lower edge of well casing, the ap
Elheny
paratus being shown as it would appear during descent
Filed Aug. 15, 1958, Ser. No. 755,253
into the well;
6 Claims. (Cl. 166-64)
FIG. 7 is a sectional view, taken along a plane corre
This invention relates to oil well casing; and more 10 sponding to line 7—7 of FIG. 2;
particularly to means for locating casing collars after the
FIG. 8 is a sectional view, similar to FIG. 2, of a
casing is in place.
modi?ed form of the invention;
Well casing comprises lengths of pipe, externally
‘FIG. 9 is an enlarged fragmentary sectional view of
threaded at both ends and joined together by collars
the modi?ed form, illustrating a dog in active position
threadedly engaging these ends. The pipe lengths are 15 and cooperating with the upper edge of a pipe length;
not uniform; they may be as short as twenty feet or as
‘FIG. 10 is an enlarged sectional view, taken along a
long as forty feet. The pipe is sunk into the well, a length
plane corresponding to line 10-110 of FIG. 8;
‘FIGS. 11 and 12 are sectional views taken along planes
corresponding respectively to lines 1i1—-"11 and 12—12
of FIG. 10‘; and
FIG. 13 is a fragmentary sectional view, taken along
at a time.
By appropriate well-known means, the depth of signi?
cant oil-bearing strata encountered during drilling opera
tions is determined; after the casing is in place, the well
is “logged” by appropriate apparatus, so that the depths
a plane corresponding to line 13—13 of FIG. 9.
Well casing 1 (FIG. 1) comprises a series of pipe
at which the collars are located with respect to these
strata are determined. Now when it is desired, for ex
ample, to perforate the well casing at a de?nite level cor
lengths 2, 3, 4, etc. joined by collars 5. These collars
extend around the ends of the pipe lengths. As shown
responding to a signi?cant stratum, the perforator ap
most clearly in FIG. 6, the adjacent pipe lengths are not
paratus should be quite accurately positioned in the well,
in contact; their opposed end edges 6 and 7 form shoul
especially if the stratum is quite shallow.
ders capable of engagement to make it possible to deter—
It is one of the objects of this invention to make it
mine the location of the ends of pipe lengths or of the
possible to obtain such accurate positioning, utilizing the 30 collars joining them.
logged depths of the collars as reference points. For
Apparatus is lowered into the well casing provided
example, if the desired depth at which a casing perfora
with two sets of dogs, a ?rst set being adapted to engage
tor is to be used lies between two collars identi?ed on
downwardly directed edge 6 of a pipe length 2, as shown
the well log, then in accordance with this invention, a
in FIG. 2. When thus engaged, there is a restraint
dog or the like lowered into the well, can be caused to 35 against upward movement of the apparatus, and this is
engage either one or the other of the opposed edges of
perceivable at the top of the well, as hereinafter described.
Another set of dogs is adapted to engage the upper edge
the desired location. Such engagement of the dog re
7 of a pipe length, should it be desired to place a restraint
strains movement of the dog in one or the other direc
against downward movement of the apparatus. How
tion along the well. This restraint is translated into a 40 ever, but one set of dogs is active at any time, the other
de?nite signal, such as greatly increased resistance to rais
set being rendered inactive in a manner to be described.
ing or lowering of the collar locator.
The support for the two sets of dogs is provided by
Accordingly, it is another object of this invention to
a pipe or tubing 8 threaded within a socket member 9.
make it possible to engage the edges of the pipe lengths,
This socket member 9 in turn is threadedly connected to
and to release them, as desired.
the upper end of a supporting body 10. Appropriate
This invention possesses many other advantages, and
sealing means may be provided between the socket mem
has other objects which may be made more clearly ap
ber 9 and the upper end of the body 10 as by the aid of
parent from a consideration of several embodiments of
O-ring 11. This ring is disposed in an annular slot formed
the invention. For this purpose, there ‘are shown a few
in shoulder 10a engaging the upper end of body 10.
for-ms in the drawings accompanying and forming part of 50 Furthermore, as shown most clearly in FIG. 2, the lower
the present speci?cation. These forms will now be de
end of the socket member 9 has a tapered conical cam
scribed in detail, illustrating the general principles of the
surface 12 forming a continuation of the conical cam
invention; but it is to be understood that this detailed
surface 13 carried by the body 10.
description is not to be taken in a limiting sense, since
Adjacent its lower end, the body 10 carries a ?ange
the scope of the invention is best de?ned by the appended 55 14 having an opposed conical cam surface 15. These
claims.
two opposed conical surfaces 12-13‘ and 15 are utilized
adjacent pipe lengths at one of the collars neighboring
eferring to the drawings:
for operating the dogs to disengage the end edges 6 and
7 of the pipe length, all as hereinafter described.
TTGURE 1 is a View in elevation of apparatus incor
porating the invention, and in well casing, the well cas
ing being shown in section; the length of well casing be
The body 10 carries at its lower end a socket mem
60 ber 16 which may carry any appropriate apparatus.
ing cut away to reduce the size of the ?gure;
FIG. 2 is an enlarged sectional view of the apparatus,
shown in use in well casing, the position of the apparatus
being such as to render detectable a casing collar by en
gagement of a set of dogs with the lower edge of a length 65
Between the Socket 16 and the ?ange 14 there is con~
?ned an annular bowed spring structure 17. This may
be in the form of upper and lower ?anges 18 and 19
carried by spring elements 20 so bent as to form a crest
21 intermediate the ?anges 18 and 19.
of pipe;
Slidably mounted on the exterior cylindrical surface
FIG. 3 is a sectional view taken along a plane corre
of the socket member 9 is a cage 22 (see also FIG. 7).
sponding to line 3-3 of FIG. 2 and illustrating the re
A collar 23 is attached to the upper end of the cage
tracted position of a second set of dogs which are adapted
member in any appropriate manner. It is in sliding con~
to cooperate with the upper edge of a pipe length;
70 tact with the socket member 9. The lower end of the
FiG. 4 is a fragmentary view similar to FIG. 2, illus
cage member has an internally threaded aperture 24 into
tratinv the ?rst set of dogs in retracted position;
which is threaded the upper end of a skirt member 25.
3,061,010
4
3
40. Accordingly, when the tube 8 has moved upwardly
to the position of FIG. 4 (releasing dogs 32, 33), the
second set of dogs 42, 43 is placed in active position.
This skirt 25 has an internal cylindrical surface adapted
to contact the crest 21 of the spring structure 17. An
inwardly radially directed projection 26 is also formed
on the skirt. This projection is adapted to ride over the
FIG. 5 thus illustrates one of these dogs of the sec
ond set in such position to restrain downward movement
of the cage structure 22. In this position, the sloping
surface 12—13 has moved upwardly away from the dog
crest 21 to compress the spring structure 17 as the pro
jection passes from one side of the crest to the other.
This produces a greatly increased resistance to relative
movement between the cage member 22 and the support
42, permitting the compression springs 38 associated with
dogs 42 and 43 to move them from the position of FIG.
ing body member 10. The utility of this arrangement
10 3 to the position of FIG. 5.
will be explained hereinafter.
Downward movement of the cage 22 is restrained as
soon as dogs 42, 43 engage an upper edge 7. From the
The cage member 22 has an internal cylindrical sur
face 27 (FIGS. 3 and 7) spaced from support 10; but
this surface is joined to cylindrical surfaces 28 and 29
(FIGS. 3 and 4) by the sloping surfaces 30 and 31.
position of FIG. 5, tube 8 can move downwardly. This
movement ultimately causes the sloping surfaces 12 and
13 to engage the upper end of the dogs 42 and 43 and
return them to the retracted position of FIG. 3 against
the force of springs 38. Engagement of the sloping sur
faces 12—13 when the sloping surface 30 of the cage
structure 22 limits this relative downward movement.
At the same time, the spring structure 17 has moved
from the position of FIG. 5 to the position of FIG. 3.
Again the projection 26 passes over the crests 21 of the
spring structure, causing a de?nite indication at the top
of the well that there is an obstruction to downward
movement of the cage member 22. In other words, the
upper end edge of a pipe length such as pipe 3 has been
located.
These sloping surfaces are adapted to coact with the
conical surfaces 12-13 and 15 to limit the sliding move
ment of the cage structure 22 ‘with respect to the sup
porting structure 8——9—10.
The cage structure is provided with slots within which
are pivotally supported two sets of dogs.
The ?rst of
these sets includes the diametrically opposite dogs 32 and
33 (FIGS. 2, 4 and 6). These dogs are located in slots
34 and 35 (FIG. 7) and pivoted by the aid of pins 36
and 37 so that they may be tilted to the active position
indicated in FIG. 2. Each of the dogs 32 and 33 has an
upper surface shown in FIG. 2 as in contact with the lower
edge of pipe length 2. These dogs are furthermore urged
toward the tilted active position by the aid of compression
The excursion of the tubing 8 between the limiting
positions of FIGS. 3 and 5 thus alternately releases one
springs 38 located in sockets 39 in the cage structure 22.
Struts 40 transmit the spring forces to the dogs. The 30 set of dogs and retracts another set of dogs. In the
position of FIG. 3, as hereinbefore explained, the dogs
upper portion of each dog 32, 33 has a pair of apertures
32 and 33 will be in the active position while the dogs 42
32a—32b and 33a-—33b. The struts 40 engage the outer
and 43 are in the retracted or inactive position. The
most apertures 32a, 33a so as to cause the upper ends
dogs 32, 33, 42, 43 all have identical forms, simplifying
of both dogs to swing outward. These struts are urged
manufacture. The struts 40, however, are so connected
outwardly of the socket 39 by the aid of the spring fol
lowers 41. These followers have ball and socket con
nections with the upper ends of struts 40. ‘The lower
ends of these struts are appropriately pivotally connected
to the dogs 32, 33.
In FIG. 6, these dogs 32 and 33 are in tilted or active
to them that in every instance the compression springs
23, 38 urge the dogs toward active position.
Furthermore, either ends of the dogs can be made to
cooperate with the edges of the pipe lengths. For ex
ample, the lower ends are effective for dogs 32, 33; and
the upper ends are effective for dogs 42, 43. This is
position, and they do not interfere with the downward
made possible by making the dog outlines symmetrical
movement of the apparatus. As these dogs pass the
upper edges 7 of lengths of pipe, the springs 38 are com
about a line normal to the axis of the pivot for the dogs.
When the cage structure 22 is restrained against up
ward movement as in FIG. 2, the upward movement of
the tubular member 8 causes ultimate retraction of the
dogs 32 and 33 to the position of FIG. 4 and at the same
time the other set of dogs 42 and 43 is placed in active
tilted position, capable of engaging the upper end of a
pressed; the dogs being urged inwardly within the slots
34 and 35.
However, upward movement of the tubular structure
8 will ‘bring the dogs 32 and 33 into engagement with
the lower edge 6 of the ?rst pipe length encountered.
In this upward movement there is suf?cient friction
pipe length.
between the spring structure 17 and the skirt 25 to move
The manner of use of quite obvious from the foregoing.
the cage structure 22 upwardly along with the tubular
As soon as the dogs 32 and 33 engage an
Assuming that the apparatus is in the position of FIG.
edge surface 6, the cage structure 22 is restrained from
further upward movement. Accordingly, as the tube 8
and its associated parts move upwardly relative to the
cage structure 22, the projection 26 carried by the skirt
25 passes over the crests of the spring structure 17. The
pressure exerted by the projection 26 on the spring struc
ture is'clearly perceptible at the top of the casing and
indicates to the observer that a collar has been located.
After the crest 21 is passed, the conical cam surface 15
engages the lower end of the dogs 32 and 33 and urges
them to the retracted position of FIG. 4.
Upward movement of the tubular member 8 relative
to cage 22 causes outward tilting of‘ another set of dogs
42, 43 (FIGS. 3, 5 and 7). These dogs 42 and 43 are
2, the tube 8 may be gradually lowered into a well. The
active dogs 32 and 33 then click past the ends 6 and 7 of
. successive lengths of pipe until approximately the desired
depth is reached between two collars to be located, the
two collars being identi?ed on the well log. Then the
structure 8.
equiangularly spaced from dogs 32, 33. They are piv
oted in the same fashion as dogs 32 and 33 but have
tubing 8 is pulled upwardly against gravity until the
dogs 33 engage the lower edge 6 of a length of pipe.
Further upward pull on tube 8 causes the crest 21 to
pass from one side to the other of projection 26, thereby
giving an indication that the cage member 22 is restrained
' against upward movement. This additional necessary
pull may be of the order of thousands of pounds, as
determined by the design of spring 17. It is thus easy to
observe this condition, and thereby to know that a col
lar has been located at a depth corresponding to the
length of the tubing 8 in the well.
After this occurrence, the relative position of the cage
downwardly directed engaging ends. In this case, how
ever, the lower portions of the dogs are urged outwardly on their pivots by the struts 40. The dogs 42 and 43
are identical with dogs 32, 33, and likewise have two
apertures 42a-42b and r43a--43b._ Therefore, to urge
these dogs 42, 43 so as to assume the position of FIG. 5,
the inner apertures 42b and 43b are engaged by struts 75
structure 22 and tube 8 is illustrated in FIG. 4.
Dogs
32, 33 are retracted, and dogs 42, 43 are in active posi
tion (FIG. 5). Further upward movement simply causes
the second set of dogs 42 and 43 to click past the edges
of the adjacent pipe lengths. However, downward move
ment of tubing 8 brings the dogs 42 and 43 to the posi
3,061,010
tion of FIG. 5 against the upper edge of the pipe 3.
Here again, increasing the weight on tube 8 su?iciently
(5
to move the crest 21 of spring 17 past the projection 26
is an indication that the cage structure 22 has been
be quite conventional. It may include a cage 78 (FIG.
11) having a lower enlarged head 79' threaded into the
bottom 67 of the cylinder 63. This cage provides a
valve seat 80 at its upper end adapted to be engaged
stopped in its downward movement. The dogs 42 and
43 are then urged by cam surfaces 12, 13 to the retracted
position as indicated in FIG. 3 and the ?rst set of dogs
by the conical closure member 81 urged to closing
position by compression spring 82. The cage 78 has a
through port 78a communicating with port 76a and with
32 and 33 are released by the cam surface 15 to tilt into
the interior of the cage.
active position, as illustrated in FIG. 2.
Appropriate sealing means such as O-rings 83 and 84
Up and down movement of the tube 8 can thus sense 10 are provided for the cage 78 to maintain ?uid-tight seal
the location of the collars 5. By appropriate coordina
between the cage and the wall 67. Furthermore, the
tion with the log of the well, it is possible to locate those
clostn'e member 81 is carried by a stem 85 around which
two collars which are signi?ant in connection with the
the compression spring ‘82 extends. The lower end of
operation to be performed in the well.
stem 85 is guided in head 79.
In the form of the invention illustration in FIGS. 8 15
By making the spring 82 strong enough, a substantial
to 13, inclusive, only one set of dogs is utilized, and
resistance to the downward movement of the piston '71 is
relative movement between the cage structure and the
supporting structure is opposed not by spring pressure
but by hydraulic means.
effected. This in turn means that the weight that must be
imposed on tubing 48 to open the check valve 77 must
be quite large. The rate at which relative movement is
In FIG. 8 a set of three dogs (two of which are shown 20 permitted between the stationary cylinder 63 and the
at 44 and 45) is in retracted neutral position. The dogs
are equiangularly disposed about the axis of the cage
support member 50 is also controlled by this check valve.
Flow of liquid past the check valve structure 77 to the
structure 47. The tubing in this case includes an upper
port 76 causes liquid to be supplied to the interface be
section 48 coupled as by a collar 49 to the supporting
tween the ?ange 60 and the surface 74. Ultimately all
body 50. Carried on a reduced portion 51 of the support 25 the liquid from chamber 73 is accommodated in the
ing body 50 are the three cams 52 as by the aid of a ring
chamber 75, as indicated in FIG. 9.
53 and machine screws 54 (see also FIG. 13).
FIG. 11 illustrates an intermediate position of the piston
The cam surfaces 55 in the position of FIG. 8 cooperate
or ?ange 71, being urged downwardly to force the liquid
with corresponding surfaces 55a of the three dogs 44,
past the check valve structure 77. As this occurs, the
45, etc. to retract them to the position of FIG. 8 against 30 ?ange or piston 60 is urged downwardly and ultimately
the pressure of the enclosed springs 56. Each of the dogs
into contact with the upper surface of the piston 71 as
44, 45, etc. is located in its slot such as 57, 58.
illustrated {in FIG. 9.
The cage structure 47 at its lower end threadedly en
gages the upper end of a sleeve 59. At its lower end, the
Under such circumstances, the sleeve 59 being joined
to the piston 60 moves ‘downwardly and pulls the cage
sleeve 59 has a ?ange 60 which operates as a piston in a 35 structure 47 away from the cam surfaces 55, permitting
surface 61 of cylinder structure 63. An appropriate seal
ing means such as the O-ring 62 may be provided between
the surface ‘61 and the piston 60.
The upper end of cylinder structure 63 is threaded to
outward tilting of the dogs 44, 45, etc.
Because the cylinder chamber 75 is long and narrow,
as compared with the cylinder chamber 73, the piston 69
moves through a greater distance than piston 71 when
receive a cap 64 that overlies the upper edge of this 40 there is an interchange of liquid between these chambers.
cylinder structure 63 and forms and end annular surface
This accordingly proivdes for a separation between the
74 for the cylinder surface 61. Cap 64 is sealed against
cam surfaces 55 and the dogs 45 to permit the dogs to be
the outer periphery of the sleeve 59, as well as against
cocked to the position of FIG. 9.
the cylindical surface 61. This may be accomplished by
The dogs 44, 45 in the cooked position restrain the
the aid of O-rings 65 and 66.
45 cage structure 47 from further downward movement upon
The cylinder structure 63 includes a relatively thick
engagement with an upper edge of a pipe length 95
lower head 67. This head 67 is connected by a lower
(FIG. 9).
hollow threaded extension 68 to a pipe or tube 69, the
After the dogs are thus cocked, the entire assembly
purpose of which will be hereinafter explained.
may be moved upwardly ‘to a desired depth. For this
The surface 70 of the lower head 67 serves as an end 50 purpose, tubular member 69 is released so that it may
surface for the cylinder space.
move upwardly.
Also operating within the cylinder 63 is a ?ange 71,
Now, when support 50‘ is pulled up, the cylinder 63
forming a piston integrally joined to the body 50. This
is also moved up by raid of the column of liquid in
?ange or piston 71 may be sealed against the cylindrical
chamber 75 as pistons 60 and 71 move in unison up
surface 61 by the aid of an O-ring 72.
55 wardly. Since only the weight of the cylinder 63 and
A cylinder chamber 73 is formed between the ?ange
attached pipe 69 is effective to urge the wall 74 toward
71 and the surface 70 (see FIGS. 8, 11 and 12). When
piston 60, another check valve 86 (FIG. 12) effectively
the ?ange 60 is spaced from the lower surface 74 of cap
prevents escape of liquid from chamber 75 while ‘the as
64 (FIG. 9), there is another annular cylinder chamber
sembly is moving upwardly. The location and further
75 formed between the ?ange 60 and surface 74. Hy 60 function of this valve will be hereinafter described. Up
draulic ?uid, in a manner to be hereinafter described,
ward movement of the support 50 thus carries with it the
may be interchanged between these two chambers 73
sleeve 59 and the cage 47 in unison so that the outer
and 75, for controlling the retraction and tilting of the
lower ends of the dogs 44 and 45 simply click over the
dogs 44, 45, etc.
edges of the pipe lengths as the dogs move past these
Let us assume that the member 69 is stationary, that
edges.
is, by being bottomed in the well or by the aid of a packer
When it is desired to observe the location of a collar,
carried by it. Thus, in order to move the dogs 44, 45, etc.
the upward motion is reversed and now the entire struc
to the active position of FIG. 9, weight may be added
ture moves downwardly until the ‘dogs 44, 45, etc. are
to the tubing 48 so as to urge the liquid from the cylinder
restrained by the top edge of a pipe length. Now the
chamber 73 into the cylinder chambers 75 (FIG. 9).
cylinder structure 63 is urged downwardly by the ?ange
This interchange of liquid is effected through ports 76
71. Thus in this movement, the liquid is urged outwardly
and 76a (see also FIGS. 10, 11 and 12) provided in the
from the cylinder chamber 75 into the cylinder chamber
wall of the cylinder structure 63. The cylinder chamber
73 is in communication with port 76a by the aid of a
73. Check valve 86 ‘is used for this purpose, illustrated
check valve structure 77. This check valve structure may 75 in FIGS. 10 and 12. This check valve‘structure 86 com- 7
3,061,019
7
8
municates with the port 76 via port 76b. It has a body
lar con?guration; the interior of said hollow member
being unobstructed; a cage member slidably supported
87 having a threaded head 88 engaging a ‘threaded aper
ture in the head 67. The body 87 is sealingly accom
for movement within limits on the exterior of said sup
modated in a bore 89 communicating with an inlet port
port member; one or more dogs carried by the cage
member and movable optionally to extend outwardly
90 to the space 73.
The body 87 extends into a bore 89 in communication
of the cage member or to be retracted therein; resilient
means urging said one or more dogs outwardly; said
with port 90. The body 87 at its upper end has a seat 91
cooperating with a conical closure member d2 disposed
dog or dogs being adapted, when in their outward posi
‘above the seat. This conical closure member 92 is urged
tions, to engage an end edge of a length of pipe as the
strongly downwardly to seated position by the aid of a 10 support member and cage member are moved in one di
strong compression spring 93 located in the bore 89.
rection and thereby to arrest the movement of the cage
Closure 92 has a stem extending in the central port of
member; a resilient structure encircling the support
body 87 and guided therein. A transverse port 8712
member and encircled by the cage member; means car
extends from the central port and communicates with
ried by one of the members to cause the resilient struc
port 76b.
15 ture to be momentarily compressed when said support
~By appropriate choice of the spring 93, the resistance
member is moved relative to the arrested cage member,
to downward movement of the piston 71, body 50, and
said compression occurring at an intermediate point in
the cylinder 63 may be made quite high. When this re
the relative movement of the support member and cage
sistance is overcome by added weight, the valve closure
member; and means carried by the support member for
92 is unseated, and the liquid slowly moves via ports 76
retracting the dog or dogs upon continued movement
and 76b to the chamber 73 (FIG. 8). The greatly in
of the support member in said one direction.
creased resistance to downward movement may be ob
4. In a locator for collars joining tubular lengths of
served at the top of the Well to indicate that the dogs 44,
pipe: a hollow rigid support member of generally tubu
45, etc. are in restraining position.
lar con?guration; :the interior of said hollow member
Ultimately the parts reach the position of FIG. 8. The 25 being unobstructed; a cage member slidably supported
cam surfaces 55 now retract the dogs 44 and 45.
The
for movement within limits on the exterior of said sup
operations may now be repeated.
port member; one or more dogs carried ‘by the cage
The inventors claim:
member and movable optionally to extend outwardly
1. In a locator for collars joining tubular lengths of
of the cage member or to be retracted therein; resilient
pipe: a support member; a cage surrounding the member 30 means urging said one or more dogs outwardly; said
and slidable thereon within limits; said cage having a slot
dog or dogs being adapted, when in their outward posi
or slots that extend longitudinally of the cage; a dog or
tions, to engage an end edge of a length of pipe as the
dogs respectively pivotally mounted in said slot or slots
support member and cage member are moved in one
whereby ‘the dog or dogs may be tilted to engage the
direction and thereby to arrest the movement of the cage
end edge of a pipe length or retracted to disengage said 35 member; a resilient structure encircling the support mem
dog or dogs from said end edge and thereby respectively
ber and encircled by the cage member; said resilient
to restrain movement of the cage or to permit movement
structure having a crest intermediate its ends; means
of said cage; said support member having a tapered sur
car-ried by one of the members for depressing the crest
face adapted to engage the dog or dogs to retract the dog
when said support member is moved relative to the ar
or dogs; resilient means for tilting said dog or dogs into 40 rested cage member, said compression occurring at an
engaging position, said cage having a surface correspond
intermediate point in the relative movement of the sup
ing to said tapered surface and engageable with the tap
port member and the cage member; and means carried
ered surface on the support member for imposing a
by the support member for retracting the dog or dogs
limit on the relative sliding motion; said cage having a
upon continued movement of the support member in
skirt; a bowed spring structure of annular form carried
said one direction.
by the support member and having a crest engaging the
5. In a locator for collars joining tubular lengths of
skirt; and a projection carried by the skirt and adapted
pipe: a hollow rigid support member of generally tubu
lar con?guration; the interior of said hollow member
being unobstructed; a cage member slidably supported
to ride over the crest ‘to provide a temporary increased
resistance to sliding movement.
2. In a locator for collars joining tubular lengths 50 on the exterior of said support member; means for limit
of pipe: a hollow rigid support member of generally
tubular con?guration; the interior of said hollow mem
ber being unobstructed; a cage member slidably sup
ported on the exterior of said support member; means
for limiting relative sliding movement between the mem 55
bers; one or more dogs carried by the cage member and
ing relative sliding movement between the members; a
?rst set of one or more dogs carried by the cage mem
ber and capable of tilting and moveable into engage
ment with an edge of a length of pipe when the support
member and cage member are moved in one direction; a
second set of one or more dogs carried by the cage mem
movable optionally to extend outwardly of the cage
ber and capable of tilting and moveable into engage
member or to be retracted therein; resilient means urg
ment with an end edge of a length of pipe when the
support member and cage member are moved in the
ing said one or more dogs outwardly; said dog or dogs
being adapted, when in their outward position, to engage 60 other direction; resilient means for urging the dogs of
an end edge of a length of pipe as the support mem
the sets into tilting position; said dogs serving to arrest
ber and cage member are moved in one direction and
means interposing a. resilient force resisting movement in
the movement of the cage member; means interposing a
resilient force resisting relative movement of the sup
port member and cage member after movement of the
said direction of the support member after the cage
movement is stopped by the dog or dogs, comprising a
a spring structure constructed to provide a maximum
thereby to arrest the movement of the cage member;
spring structure carried by one of said members con
structed to provide a maximum resilient resisting force
against relative movement between the cage member and
the support member, occurring intermediate said rela
tive movement; and means carried by the support mem
ber for retracting the dog or dogs upon continued move
ment of the support member in said one direction.
3. In a locator for collars joining tubular lengths of
pipe: a hollow rigid support member of generally tubu
latter member is stopped by the dog or dogs, comprising
resilient resisting vforce against said relative movement
occurring at an intermediate point in said relative move
ment; and means carried by the support member for re
70 tracting the dog or dogs upon continued movement of
the support member after movement of the cage member
is stopped by the dog or dogs.
6. In a locator for collars joining tubular lengths of
pipe: a hollow rigid support member of generally tubu
lar con?guration; the interior of said hollow member
3,061,010
10
being unobstructed; a cage member slidably supported
within limits on the exterior of said support member; a
tion for the other surface and the other set of dog or
dogs; a resilient structure encircling the support mem
?rst set of one or more dogs carried by the cage member
ber; and means carried by one of the members to cause
and capable of tilting into engagement with an end edge
of a length of pipe when the support member and cage
the resilient member to be momentarily compressed at
an intermediate point in said relative movement, for
either direction of relative movement.
References Cited in the ?le of this patent
UNITED STATES PATENTS
member are moved in one direction; a second set of one
or more dogs carried by the cage member and capable of
tilting into engagement with an end edge of a length of
pipe when the support member and cage member are
moved in the other direction; resilient means for urging 10
the dogs of the sets into tilting position; said dogs serv
ing to arrest the movement of the cage member; said
2,091,750
2,199,020
Brown ______________ __ Feb. 27, 1940
Barrett et a1. ________ __ Apr. 30, 1940
2,280,769‘
Page ______________ __ Apr. 21, 1942
Burt ________________ __ July 10, 1945
support member having two surfaces limiting the rela
2,380,022
tive sliding movement of said support and cage members,
2,613,746
each said surface being also adapted to urge respective 15 2,741,316
set of dog or dogs to retracted position upon completion
of said relative movement in one direction for one sur
face and one set of dog or dogs and in the other direc
2,746,550
2,856,007
2,924,278
Whitney ____________ __ Oct. 14, 1952
Long ______________ __ Apr. 10, 1956
Mitchell ____________ __ May 22, ‘1956
Fredd ______________ .._. Oct. 14, 1958
Garrett et a1. __________ __ Feb. 9, 1960
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