close

Вход

Забыли?

вход по аккаунту

?

код для вставки
' Dec. 3, 1946.
-
w. D. WALTERS
'
2,412,020v
WORKING PLATFORM ARRANGEMENT FOR PORTABLE DERRICKS
'
Filed June 15, ‘1945
'
2 Sheets-Sheet 1
3
27
2F
'
‘712
vl2
5
6’,
4
INVENTOR.
WILLIAM
BY
'
I
o.
WALTERS
I
ATTORNEY
Dec. 3, 1946.
2,412,020
w. D. WALTERS
WORKING PLATFORM ARRANGEMENT FOR PIORTABLE DERRICKS
- Filed June 15,‘ 1945
2 Sheets-‘Sheet 2
24 2|
24
2O
‘ ' “ 111211111
\27
WILLI ‘ \
IN VEN TOR.
D WALTE RS
,8?!’
ATTOR NEY
2,412,020
Patented Dec. 3, 1946
oan‘so STATESPATEM orrlcs
WORKING PLATFORM ARRANGEMENT FOR
PORTABLE DERRICKS
William D. lilalters, ‘Garden Villas, Tex., assignor
to Emsco Derrick 8; Equipment Company, Los
Angeles, Calif., a corporation of California
Application June 15, 1945, Serial No. 599,714
1-9 Claims. (01. 304—14)
1
2
My invention relates to derricks or masts em
ployed in conjunction with the ‘drilling and
maintenance of wells, and the invention relates
>
I
be rested during a part of the operation of rack
ing or unracking the pipe.
A further object of the invention is to provide
in the upper part of a derrick a ‘pair of oppositely
in particular to a derrick having in the upper
part thereof means for facilitating the handling Ca disposed inwardly projecting platforms, with
means for adjusting these platforms toward and
and racking of pipe.
away from the center of the working zone, and a
A string of pipe used in a well for rotary
further object of " the invention is to provide a
drilling consists of a plurality of stands of pipe,
simpli?ed means for ‘guiding or positioning the
each stand of pipe comprising a number of sepa
upper ends of the racked pipe, which means will
rate lengths of pipe connected together by
also serve as a footrest or platform on which the
couplings. It is an object of the invention to
workman may stand.
_
provide in the upper part of a derrick an im
proved working platform and racking arrange
Further objects and advantages of the in.
vention will be brought out in the following part
ment for facilitating the handling of these pipe
of the speci?cation.
v
'
stands during the operation of lowering the pipe
Referring to the drawings which are for illus
into or withdrawing the pipe from the well.
trative purposes only,
1
An object of the invention is to provide a work
Fig. 1 is a side elevation of a derrick having
ing platform arrangement on which a workman
my present invention therein.
'
may work with safety, speci?c parts of the ar
Fig. 2 is an enlarged cross section taken as
rangement being so placed as to facilitate the 20
indicatedjby the line 2—2 of Fig. 1. .
p
‘
handling of the pipe during the racking of the
Fig. 3 is an enlarged sectional view taken. as
pipe or during the removal of the pipe fromthe
indicated by the line 3+3 of Fig. 2., f
_
rack and the assembling of the pipe stands in a
Fig. 4 is an enlarged sectional View taken as
continuous string, as such string is lowered into
the well.
1
aCl indicated by the line 4-4 of Fig, 2. '
The derrick 2 shown in Fig. 1 comprises legs
. An object cf the invention is to provide in the \
3 connected by suitable girts and cross bracing A.
upper part of .a‘ derrick a platform assembly which
The derrick 2 is laterallyv enlarged as ‘indicated
comprises a pair of platforms projecting into the
at 5 to provide a racking space for pipe stands
derrick area from opposite sides of the derrick
6. The upper portion of the derrick structure in
structure so that a passage or mouth is de?ned
between the adjacent portions of these platforms,
cludes girts l and~8 disposed in opposed pairs‘ as
this mouth connecting a working zone .anda pipe
racking zone de?ned in the derrick area by the
shown in Fig. 2 so as to form an upper frame
platforms.
.
An object of the invention is to provide .a pair -'
of working platforms as described in the pre
ceding paragraph, these platforms being placed
work de?ning in the upper part of the derrick a
rectangular derrick area v9. For the purpose of
this description, the derrick area .9 is the area
which lies within the girts 1 and 8. A portion
of this area 9 ‘traverses the upper part of the
pipe racking space and also intersects the pro
so that their inner edges will be suficiently close
jected axis A of the well l0.
,
together to enable a workman to stand in a posi—
Platforms ii and 52 of substantially the same
tion straddling the space or mouth between the 40
shape and area are extended into the area 9
adjacent edges of the platforms. When in this
from the girts ‘i so as to divide the area
and
position, the workman faces the projected axis
de?ne therein a working zone 53 surrounding
of the well, in centralized relation so that he may
the projected axis A of the well, and a racking
apply to best advantage ‘such force .as is neces
zone is which is situated in the upper portion of
sary to produce movement of the upper end of
the pipe racking space of the derrick. The work
a stand of pipe.
ing and racking zones lie within the frame work
A further object of the invention is to provide
formed by'the pairs of girts l‘ and 8, and, lying
a dual platform arrangement ‘for the upper. part
in side by side relation have a common side along
‘of aderrick wherein apath of movement for the
upper end 'of the stand ‘of pipe is de?nedlby the 50 which the platforms H and H are extended... The
inner edges 85 of the platforms ii and H are
adjacent ‘edges of the ‘platforms, and a stop or
rest which extends into or along this path of
movement in a position between ‘the projected
axis of the well and the racking space, ‘against
which the upper portion ‘of the pipe stand may '
spaced apart'so as to define .a contracted passage
mouth it connecting the zones 53 and 1.4 and
forming a part ‘of a path of movement for the
upper-portions of the pipefrcm the projected well
2,412,020
axis A to the racking zone I4. Each platform II
and I2 has a rectangular frame IT and a reticu
lated ?oor I8 through which the workman stand
ing on either of the platforms, or both of them,
may view the proceedings in the lower part of
4
which they are shown in to vertical positions
retracted from the racking zone I4. The left
hand girt 8 is shown as a H structural section
capable of supporting a plurality of brackets 28
which pivotally support the ?ngers 21. Each
bracket 28 includes a pair of vertical plates 29
which project upward from a base plate 33 which
handling the upper portions of the pipe. At the
is clamped against the upper portion of the girt 8,
outer edge of each platform I I and I2 there is
as shown in Fig. 3. This clamping of the brack
a member, shown as a structural angle, I9 having
hinged members 20 projecting therefrom to en 10 ets in desired positions is accomplished by use
of bolts 3I which extend through the base plates
gage a horizontal bar 2I, supported upon the
30 and cooperating clamping plates 32 which
contiguous girt ‘I by means of brackets 22. When
extend across the lower face of the girt 8. The
the platforms are in horizontal positions,v the
plates 39 and 32 have therein several sets of bolt
lower legs of the angles I9 will engage the girts
openings 33, through which the bolts 3| may be
‘I, as shown at 23 in Fig. 4, to support theplat
extended, these several sets of bolt openings 33
forms in horizontal positions without need for
making it possible to shift the brackets 28 toward
additional bracing. The platforms may be swung
or away from the racking zone I4. Also, it is
into upright, retracted positions on the bars 2I,
possible to slide the brackets 28 along the girt 8
when desired, and the hinge members 20 may be
slid along the bars 2I for the purpose of adjust 20 so as to change the spacing of the ?ngers in
keeping with the diametral dimension of the pipe
ing the platforms II and I2, which are common
which is racked. Each of the brackets 28 has a
to the zones I3 and I4, toward and away from
block 34 for supporting the cooperating ?nger 21
the center of the working Zone I3, or, in other
in horizontal position, and the plates 29 are pro
words, this adjustment makes possible the chang
ing of the space between the platforms and the 25 vided with openings 35 through which pins may
be extended as indicated at 35 in Fig. 3, to hold
projected axis A of the well as may be required
the ?ngers 21 in vertical position as indicated
for greatest facility in the handling of the upper
by dotted lines 21’. The pins 36 are positioned
portions of the pipe during the making up of
so that they will also serve as stops to prevent
the string of pipe or the racking of the pipe as
the string is removed from the well. The hinge 30 the ?ngers 21 from being raised from the hori
zontal positions in which they are shown in full
members 20 are provided with stud screws 24
lines. A workman may’ progressively lower the
‘ whereby the platforms may be locked in place
?ngers 21 from vertical position to horizontal
after they are adjusted.
position as the pipe racking proceeds, or he may
A ?nger or stop 25 is provided in a position
projecting into the path of movement of the 35 retain all or most of the ?ngers in horizontal
position. The upper faces of the ?ngers 2‘! are
upper portions of the pipe from the working zone
substantially level with the platforms II and I2
I3 to the racking zone I4. This stop 25 comprises
so that/the workman may readily step from the
a plate or bar having the outer end thereof en
platforms onto the ?ngers or, in guiding the upper
larged, as shown in Fig. 2,‘ so as to provide a
hook effect which will prevent a pipe from slid 40 portion of a pipe to or from the space between
adjacent ?ngers, the workman may stand with
ing off the stop, when the upper portion of the
one foot on a platform and the other foot on a
pipe is rested against the stop, as indicated at
the derrick as a guide to his own activities in
6b in Fig. 2.
'
V
The inner end‘of the stop 25 is hinged to a
plate 26 which is bolted onto the platform I2
?nger or upon a board which is placed across a
number of ?ngers 21.
When going out of the well—that is to say,
when the string of pipe is being pulled from the
near the edge of the platform nearest the work
well-and the pipe stands are consecutively un
ing zone I3, and in such position that the stop
may project into the mouth I6 which is formed
screwed and stacked in the racking space of the
between the inner edges of the platforms II and
derrick, the workman may stand with one foot on
I2. The stop 25 may be swung into retracted 50 each of the platforms II and I2, so as to straddle
the opening I6 facing the block, as the hoisting
equipment pulls the pipe into the upper part of
may kick the same over into extended position
the derrick. The workman is thus positioned on
the center line of the derrick and so close to the
with one foot, while his hands are employed for
holding or guiding the upper portion of the pipe. 55 projected axis A of the well that he may readily
handle the upper end of the pipe, For example,
The means provided for guiding or holding the
when the lower end of the raised pipe stand is
upper ends of the pipe when it is racked as indi
uncoupled from the remainder of the string
cated at 6' in Fig. 2 comprises a plurality of ?n
which extends into the well, he may without difii
gers 21 which are extended from the left hand
girt 8, in parallel relation to and On opposite 60 culty exert a force against the upper end of the
pipe or against the elevator to swing the pipe
sides of the extended axis of the passage I6, into
away from him. The return swing of the pipe
the racking zone I 4 toward and in similar relation
willrbring it close to him so that he can bring
or in the same direction with reference to the
it to rest against the stop 25, as indicated at 6b,
platforms II and I2, the length of these ?ngers
2'! being such that a lateral space or passage 28 65 Fig. 2, and then unlatch the elevators after the
position, indicated by dotted lines 25', Fig. 4, and
when use of the stop is required, the workman
workmen on the derrick ?oor have properly po
is left between the ends of the ?ngers 2'! and the
sitioned the lower end of the pipe in the pipe
platforms II and I2 through which the upper
racking space of the derrick. The upper portion
portions of the pipe may be moved from the
of the pipe may be then moved through the
mouth IE to the spaces between the ?ngers ‘21
or between the ?ngers 2‘! and the adjacent por 70 mouth I6 and the space 28 into .the selected space
between or adjacent ?ngers 21. In going into
tions of the girts ‘I.
the hole, the upper portion of the pipe is moved
In Fig. 3 I have shown means for adjustab-ly
from its position in the rack and placed behind
supporting the ?ngers 21 so that the spacing
or against the stop 25 so as to be then in posi
therebetween may be varied and so that the fin-'
gers may be swung from horizontal positions in 75 tion for attachment of the elevators.
iaurrzgoao
:5
Ircl'a'im: as my ‘invention:
-
1. In a derrick having in the upper'llfart‘itl'iereof
astructure de?ning qaderrijck area, ‘the ‘combina
tionof: a pair of ‘platforms, eachextending vIin
‘from an intermediate portion of an opposite side
‘of-the derrick structure with the ‘inner edges
rear :ends. thereof spaced from theends of'the
uernckiarea and the inner edges thereof spaced, '
apartf‘so» as to ide?ne in said derrick area a work
ing zone Ianda‘racking zoneand a mouth con
necting said zones through which the upper por
‘tio'n‘lof ‘a pipe may be passed from one of said
‘zones to, the other, said platforms ‘having, their
thereof spaced apart so as to'de-?ne ‘in said der
inner edges spaced soatha‘t a workman can stand
‘riok'areavaworking'zone and ‘a rackingzone and
straddling'l'said ‘mouth; and a plurality of sub“a mouth -'co'nnecting said zones ‘through which
the upper portion of 'aipipe may be passed from 10 stantially horizontal ?ngers projecting toward
said Working (zone and disposed in spaced rela-v
one ‘of said ‘zones to ‘the other, said platforms
tioninisaidracking zone ‘so as to de?ne spaces to
having their "inner vedges spaced ‘so that a work
receive the upper portions of said pipeand su?i
man can stand vstraddling ‘said mouth and said
cie'ntly close to the'level of said platforms as to
working and racking zones expanding adjacent
the ends of said platforms ‘to the ‘full width of 15' ‘provide 'f‘ootrests on‘which the workman may
the d'err-ick'are'a.
'
'
stand.
‘6. In alderrick having in the upper part there32. ‘In a derrick having in “the upper part thereof
of astructure de?ning a derrick area, the com
a ‘structure-de?ning ~a‘derrick area, the combina
bination of: a ‘pair of platforms, each extending
tion of: ‘a pair of platforms, each extending in
‘from "an opposite side of the derrick structure 120 in from an intermediate portion of an opposite
side of the derrick structure with the front andv
with the inner edges thereof spaced apart so as
rear "ends thereof spaced from the ends of the
to de?ne in said derrick area a working zone and
derrick area ‘and the inner edges thereof spaced
1a racking zone and a mouth connecting said
apart so as to de?ne in said derrick area a work
zones through which-the upper portion of a pipe
may be ‘passed fromrone'of said zones to the '
ing zone and a racking zone and a mouth ‘con
other; and a stop hingedly connected to'one of
necting said‘zones through which the upper por
said platforms so as to swing .upwardly from a
tion of "a pipe may be passed from one of said
zones to ‘the other, said platforms having their ‘
inner edges-spaced so that a workman can stand
position projecting into said mouth ‘to a retracted
‘position above the platform to which it is con- v
nected.
‘3. 'In'a’derri'ck having in the upper part there
of "a structure de?ning a ‘clerrick'area, the com
bination of: a .pairof platforms, each extending
in from an intermediate portion of an‘oppo'site
side for-the derrick structure with the inner edges ~“
straddling ‘said mouth; and a plurality of sub
stantially horizontal ?ngers extending in said,
racking zone so as to have the free ends thereof
faced‘ toward said working zone and spaced from
the ‘adjacent ends ‘of the platforms so as to pro
vide ‘a lateral passagew'communicatin‘g interme
thereof ‘spaced ‘apart so as to de?ne in said der
diate iits ends with vsaid mouth, said ?ngers de
rick ‘area a‘working ‘zone and a racking zone and
a mouth connecting said zones through vwhich the
upper portion of a .pipe'may be passed 'from one
In: “' "g spaces to receive the upper portions of said
e ‘and su?iciently‘close to the level of said plat
forms ‘as ‘to provide footrests on which the work
‘of said "zones to the other, said mouth forming ‘
‘part of ‘a ‘path of vmovement through which the
manim‘ay stand.
upperportion of the pipe is normally moved from
a structure de?ning a derrick area, ‘the ‘combina
tion of: a "pair of platforms, each extending .in
the Working zone to the racking zone and said
"7. In aderrick having in the upper part thereof
working and racking zones expanding vadjacent a‘ from an intermediate portion of an opposite side
“the ends ‘of said platforms to the full width of
ofth'e derrick structure‘ with the inner "edges
the derrick area: and a stop extending into said
path of ‘movement against which‘the upper por
thereof spaced apart so as to de?ne in said der- .
rick area-a ‘Working zone and a racking zone and
tion of the ‘pipe may be rested,'said stop being
from the platform to a retracted position above
a mouth connecting said zones‘through‘which the
upper portion of a pipe may be passed from one
of-said zones to the other; and means adjustably
connecting said platforms to said structure so
the platform to which it is connected.
‘that they maybe translated horizontally toward
4. “In a derrick having in ‘the upper part there
of a structure ‘de?ning a derrick ‘area, the combi
‘and away from'th‘e center of said working zone.
8. ‘In a derrick having in the upper part thereof
hingedly ‘connected to one of said ‘platforms so as
vto ‘swing upwardly from a ‘position extending
nation of: 9’ pail‘ of platfdl‘ms, each ‘extending in "a '7 a structure defining a derrick area, the combina- ’
tion or: a pair of platforms, each extending in
from an opposite side of the derrick structure
with ‘the inner edges thereof spaced apart vso as
‘to de?ne in saidderrick area a working zoneand
'a mouth connecting said zones through which 61.) a racking zone and a mouth connecting said zones
through which the upper portion of a ‘pipe ‘may
the upper ‘portion of va pipe may be passed from
be passed ‘from one of said zones to the other, ‘said
one of said zones to the other, said incuthff'orm
platforms having their inner edges spaced so that
ing part of a path of movement "through which
‘a workman can stand straddling said mouth; a
‘the upper portion of the pipe is normally moved
plurality of substantially horizontal ?ngers ex
from the working Zone ‘to the racking zone; a
tending in said racking zone so as ‘to have the
stop ‘extending into said path of movement
‘free ends thereof faced toward said platforms,
‘against ‘which the upper portion of the pipe may
fingersde?ning spaces to receive the upper
be ‘rested; and racking guides supported in said
‘from ‘an intermediate portion of an opposite side
of "the derrick structure with the inner edges‘
thereof spaced apart so as to define in said der
fri'ck area a ‘working zone and a racking zone and
racking zone in positions projecting ‘toward said '
portions or said ‘pipe vand sufficiently closeto the
working zone.
5. In a derrick 'having in the upper part there
level of said platforms as to provide'footre'sts on
which the workman may stand‘; and means ad
'of a structure de?ning a derrick area, the com
justably connecting said platforms to ‘said vstruc
tare ‘so that they may be movedtoward'an‘d away >
bination of t a pair of platforms, ‘each. extending
7 I
in from an intermediate portion of an opposite _ _ from the center'o'f said working zone.
side of the derrick structure with the front and - " ‘ e. In-adérrick having in the'upperipart thereof
2,412,020
7
a structure de?ning a derrick area, the combina
8
working zone; and pipe ‘racking guides in said
racking zone.
13. In a derrick having in the upper part there
of, a structure de?ning a derrick area, the com
to de?ne in said derrick area a working zone and Cu bination of : a pair of horizontal, substantially
tion of: a pair of platforms, each extending in
from an opposite side of the derrick structure
with the inner edges thereof spaced apart so as
a racking zone and a mouth connecting said zones
through which the upper portion of a pipe may
be passed from one of said zones to the other,
parallel, bars carried by the opposite sides of said
structure on the opposite sides of said derrick
area; a pair of platforms each extending inward
from one of said bars so as to de?ne in said der
so that a workman can stand straddling said 10 rick area a working zone connected to a racking
said platforms having their inner edges spaced
mouth; a plurality of substantially horizontal
?ngers extending in said racking zone so as to
have the free ends thereof faced toward said
zone by a mouth through which the upper portion
of the pipe may, be moved; means adjustable
platforms, said ?ngers de?ning spaces to receive
the uppe‘r‘portions of said pipe and sufficiently
along said bars comiecting said platforms respec
tively to said bars to support said platforms and
enable adjustment of said platforms toward and
close to the level of said platforms as to provide
footrests on which the workman may stand;
rality of substantially horizontal ?ngers extend
means adjustably connecting said platforms to
said structure so that they may be moved toward
and away from the center of said working zone;
and a stop extensible into the path of movement
of the upper portion of the pipe from said work
ing zone to said racking zone, against which the
upper portion of the pipe may be rested.
10. In a derrick having in the upper part there 25
away from the center of the working zone; a plu
ing in said racking zone so as to have the free
ends thereof faced toward said platforms, said
?ngers de?ning spaces to receive the upper por
of, a structure de?ning a derrick area, the com
bination of : a pair of horizontal, substantially
tions of said pipe and sufficiently close to the level
of said platforms as to provide footrests on which
the workman may stand; and a stop extensible
from one of said platforms into the path of move
ment of the upper portion of said pipe from said
working zone to said racking zone against which
said pipe may be rested.
ing zone to said racking zone against which said
pipe may be rested.
plurality of substantially horizontal ?ngers ex
14. In a derrick having in the upper part there
parallel, bars carried by the opposite sides of said
of a structure de?ning a derrick area, the com
structure on the opposite sides of said derrick
area; a pair of platforms each extending inward 30 bination of: a pair of horizontal, substantially
parallel, bars carried by the opposite sides of said
from one of said bars so as to de?ne in said der
structure on the opposite sides of said derrick
rick’ area a working zone connected to a racking
area; a pair of platforms each extending inward
zone by a mouth through which the upper por
from one of said bars so as to de?ne in said der
tion of the pipe may be moved; means adjustable
rick area a working zone connected to a racking
along said bars connecting said platforms re
zone by a mouth through which the upper portion
spectively to said bars to support said platforms
of the pipe may be moved; means adjustable
and enable adjustment of said platforms toward
along said bars connecting said platforms re
and away from the center of the working zone;
spectively to said bars to support said platforms
and a stop extensible into the path of movement
and enable adjustment of said platforms toward
of the upper portion of said pipe from said work
" 11'. ' In a derrick having in the upper part there
'of a structure de?ning a derrick area, the com
and away from the center of the working zone; a .
tending in said racking zone so as to have the free
ends thereof faced toward said platforms, said
bination of: a pair of horizontal, substantially 45 ?ngers de?ning spaces to receive the upper por- I
tions of said pipe and sufficiently close to the level
of said platforms as to provide footrests on which
structure on the opposite sides of said derrick
the workman may stand; hinges connecting the
area; a pair of platforms each extending inward
ends of said ?ngers to said derrick structure so
from one of said bars so as to de?ne in said der
rick area a working zone connected to a racking 50 that they may be swung into retracted positions
with relation to said racking space; and a stop
zone by a mouth through which the upper por
extensible from one of said platforms into the
tion of the pipe may be moved; means adjustable
path of movement of the upper portion of said
along said bars connecting said platforms respec
pipe from said working zone to said racking zone
tively to said bars to support said'platforms and
enable adjustment of said platforms toward and 55 against which said pipe may be rested.
15. In a derrick having the upper part thereof
away from the center of the working zone; pipe
formed so as to de?ne a rectangular derrick area,
racking guides in said racking zone; and a stop
the combination of: a pair of platforms, each
extensible into the path of movement of the
extending in from the intermediate portion of an
upper portion of said pipe from said working zone
to said racking zone against which said pipe 60 opposite side of the derrick structure with the
front and rear ends thereof spaced from the ends
may be rested.
of the derrick area and the inner edges thereof
1-2. In a derrick having in the upper part there
spaced apart, so as to de?ne in the opposite ends
of a structure de?ning a derrick area, the combi
of said derrick area respectively working and
nation of: a pair of horizontal, substantially par
allel, bars carried by the opposite sides of said 65 racking zones which extend substantially full
width of the end portions of the derrick area, and
structure on the opposite sides of said derrick
a relatively narrow mouth connecting said zones
area; a pair of platforms each extending inward
through which the upper portion of a pipe may
‘from one of said bars so as to de?ne in said
be passed from one of said zones to the other,
derrick area a working zone connected to a rack
platforms having their inner edges spaced so that
ing zone by a- mouth through which the upper
a workman can stand straddling said mouth; and
portion of the pipe may be moved; means adjust
racking guides in said racking zone in spaced re
able alcng said bars connecting said platforms
lation to the rear ends of said platforms so as to
respectively to said bars to support said platforms
provide a lateral pipe passage communicating in
and enable horizontal translation of said plat
forms toward and away from the center of the 75 termediate its ends with said mouth.
parallel, bars carried by the opposite sides of said
2,412,020
9
16. In a derrick structure having an upper
framework de?ning a working zone and a rack
ing zone having a common side, the combination
of: a pair of confronting platforms extending
along the common side and positioned in spaced
apart relation to de?ne a contracted passage con
necting said zones through which the upper por
tion of a pipe may be passed from one of said
zones to the other, and a plurality of substan
tially horizontal spaced apart ?ngers in the rack
ing zone de?ning spaces to receive the upper por
tions of said pipe, said ?ngers being similarly dis
posed in relation to each of said platforms.
17. In a derrick structure having an upper
framework de?ning a working zone and a racking
zone, the combination of: a pair of confronting
platforms common to said zones and positioned in
spaced apart relationship to de?ne a contracted
passage connecting said zones through which the
upper portion of a pipe may be passed from one
‘ of said zones to the other, and a plurality of sub
stantially horizontal spaced apart ?ngers in the
racking zone de?ning spaces to receive the upper
portions of said pipe, said ?ngers being supported
and extending in the same direction with refer
ence to said platforms.
18. In a derrick structure having an upper
10
framework de?ning a working zone and a rack
ing zone, the combination of: a pair of confront
ing platforms of'substantially the same shape and
area common to said zones and positioned in
spaced apart relationship to de?ne a contracted
passage connecting said zones through which the
upper portion of a pipe may be passed from one
I of said zones to the other, and a plurality of sub
stantially horizontal spaced apart ?ngers in the
10 racking zone de?ning spaces to receive the upper
portions of said pipe, said ?ngers being supported
and extending in the same direction with refer
ence to said platforms.
19. In a derrick structure having an upper
framework de?ning a working zone and a racking
zone, the combination of: a pair of confronting
.
platforms common to said zones and positioned
in spaced apart relation to de?ne va contracted
passage connecting said zones through which the
20 upper portion of a pipe may be passed from one
of said zones to the other, and Ya plurality of
spaced ?ngers extending into areas of the racking
zone lying on each side of the extended axis of
said contracted passage to de?ne spaces therein
25 for receiving the upper portions of said pipe.
WILLIAM D, WALTERS.
Документ
Категория
Без категории
Просмотров
0
Размер файла
930 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа