US3494484A - Tilting elevator - Google Patents

Tilting elevator Download PDF

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Publication number
US3494484A
US3494484A US748700A US3494484DA US3494484A US 3494484 A US3494484 A US 3494484A US 748700 A US748700 A US 748700A US 3494484D A US3494484D A US 3494484DA US 3494484 A US3494484 A US 3494484A
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United States
Prior art keywords
elevator
pipe
bore
door
cam
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US748700A
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English (en)
Inventor
Edward J Mcfadden
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hughes Tool Co
Byron Jackson Inc
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Byron Jackson Inc
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Assigned to HUGHES TOOL COMPANY, A CORP. OF DEL. reassignment HUGHES TOOL COMPANY, A CORP. OF DEL. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: BJ-HUGHES INC.,
Anticipated expiration legal-status Critical
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
    • E21B19/14—Racks, ramps, troughs or bins, for holding the lengths of rod singly or connected; Handling between storage place and borehole
    • E21B19/15—Racking of rods in horizontal position; Handling between horizontal and vertical position
    • E21B19/155—Handling between horizontal and vertical position
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
    • E21B19/02—Rod or cable suspensions
    • E21B19/06—Elevators, i.e. rod- or tube-gripping devices

Definitions

  • An elevator for Well pipe and the like having cam mechanism thereon adapted to tilt the elevator automatically for mounting on a horizontally racked pipe, and illustrated as applied to a side opening elevator, the cam means comprising an upstanding pair of cam arms with a counterweighted pipe receiving saddle on the top rear portion of the elevator body, and a door with a detent retaining it in open position during tilting, with a finger projecting into the elevator bore adapted to contact a pipe being engaged and close the door automatically, the door having self-latching and locking mechanism.
  • the saddle remains engaged on the pipe until approximately the position where the joint seats in the bore, whereupon the saddle disengages from the pipe and the cam means becomes inoperative.
  • This invention has to do with an improved elevator for picking up a stand or section of drill pipe which has been horizontally racked.
  • an improved elevator for picking up a stand or section of drill pipe which has been horizontally racked.
  • it has been necessary to manually tilt the elevator for this purpose and this required considerable effort and usually the use of special tools inasmuch as the elevator is very heavy and difficult to tilt for placing on a pipe which is in a horizontal position.
  • one or more holes into the elevator body have been provided and the operator has had to insert a rod or bar therein and exert considerable eifort to swing the elevator on the links so that the pipe receiving bore is in horizontal alignment.
  • such arrangement usually required that the operator had to pull the elevator away from the end of the pipe and then push it onto the pipe, while at the same time controlling the hoisting mechanism to align the elevator bore with the pipe.
  • FIG. 1 is a fragmentary side elevational view illustrating schematically a well derrick and hoisting equipment, a horizontal racking arrangement, and means for positioning a stand of pipe for engagement by an elevator;
  • FIG. 2 is an enlarged elevational view showing an elevator forming the su-bject matter of the present invention with a pipe positioned for engagement thereby, the pipe and links of the elevator being illustrated in a fragmentary manner;
  • FIG. 3 is a view similar to FIG. 2 but illustrating the elevator in the position where it is being tilted for placing on the pipe;
  • FIG. 4 is an elevational View, partly in cross section, taken on the line 4-4 of FIG. 3 looking in the direction of the arrows;
  • FIG. 5 is a side elevational View similar to FIGS. 2 and 3 but illustrating the elevator engaged on the pipe, With the door closed, certain portions of the view having been cut away to better illustrate the mechanism and parts thereof being shown in dotted lines;
  • FIG. 6 is a view similar to FIG. 5 but illustrating the relative position of the mechanism in a continued lifting of the elevator with the pipe held therein;
  • FIG. 7 is a fragmentary view, taken on the line 7-7 of FIG. 6 looking in the direction of the arrows;
  • FIG. 8 is a view similar to FIG. 6 but showing the relative positions of the parts of the mechanism when the elevator has reached its uppermost position and the pipe is hanging vertically therein;
  • FIG. 9 is a fragmentary top plan view, certain parts which are shown in full line being shown in phantom in another position.
  • FIG. 10 is a front elevational view, the supporting links being broken away to better illustrate the arrangement, certain portions of the elevator being shown in dotted lines.
  • FIG. 1 there is shown schematically a well derick 21 such as that used for oil wells, the showing being fragmentary.
  • a block 22 and its attached hook 23, which block and hook may be conventional, are shown as suspended by the wireline 24.
  • the wireline 24, as shown, is fragmentary, and in normal practice extends to the crown block and to a drawworks in the conventional manner for raising and lowering the block and hook assembly.
  • the crown block and drawworks are ⁇ not illustrated inasmuch as they are common in well drilling operations.
  • the hook 23 has suspended therefrom the usual elevator links (link 25 being illustrated in FIG. 1), to which is attached an elevator 26 of the type herein described.
  • a rotary table 27 is shown on the floor of the derrick and has illustrated therein a pipe 28 extending into a well bore (not shown) and retained suspended in the rotary table by slips 29 in position to have attached thereto an additional stand of pipe to be placed in position by the elevator.
  • a stand of pipe 31 (usually threethirty feet long sections joined together) has been horizontally racked and is to be raised to a vertical position.
  • Pipe 31 has been tilted upwardly, preferably to an angle from the horizontal of approximately at its inner end which has a shouldered tool joint or box end 30, by the lifter or support 32 (shown schematically), and has been moved longitudinally inwardly toward the well bore or center from a horizontal rack 33 by means of a dolly 34, which dolly supports the outer end of said stand and which dolly 34 operates on a track 35.
  • FIGURE l illustrates schematically how the pipe may be elevated slightly at its inner end on support 32 and moved by dolly 34 into a position where the pipe is between the links of the elevator and extends across the top of the elevator 26, with the pipe tool joint 30 extended laterally past the elevator, the pipe 31 being in position to be engaged by the elevator 26 for hoisting into the derrick by means of the block 22, hook 23 and links (illustrated by links 25 and 36; see FIGS. 9 and 10i).
  • FIGS. 9 there is here disclosed an elevator known to the trade as a side-door elevator with the present invention illustrated thereon and with which the present invention is particularly useful.
  • the elevator 26 here disclosed is similar to that shown and described in U.S. Letters Patent No. 2,215,649, to G. E. Mullinix, issued Sept. 24, 1940.
  • the elevator 26 is shown as suspended by the links 25 and 36, which, in turn, are suspended from hook 23.
  • the elevator includes a body 37, having lwhat may be termed a substantially semicircular bore 38 extending vertically through the body, and with an open throat or front 40 for receiving a pipe (not shown in'FIGS. 9 and 10), such as pipe 31 as shown in FIG. 1.
  • the body 37 has a pair of laterally disposed link arms 43 and 44, one on each side thereof, which are bifurcated or slotted as shown at 45 and 46, respectively, into which the eyes of the links 25 and 36 are loosely held forming the support for the elevator 26.
  • Keeper 47 extends across the slot 45 and keeper 48 extends across the slot 46, to prevent displacement of the links 25 and 36 from their respective slots. This arrangement is conventional.
  • a closure member herein usually referred to as a door or gate 41, is hingedly connected to the body 37 at one side of the open throat 40 of the bore 38 and is shown as mounted on a vertical hinge pin ⁇ 42.
  • This door 41 is preferably of arcuate form so as to present a substantially semicircular pipe receiving socket or half bore 49 which, when the door 41 is in its closed position, extends across the open throat 40 and completes the circumferential extent of the closure .of the bore 38 through the elevator.
  • Such arrangement retains any included pipe in the bore 38"against lateral displacement from the elevator.
  • the bore 38 has an arcuate seat 39
  • the door 41 has an arcuate seat 51 which, in the illustration shown in FIGS. 9 and 10, comprise a taper extending downwardly and inwardly of the bore 38 and half bore 49.
  • This taper is for receiving the tapered end or what is generally called the shouldered tool joint or box end 30 of a pipe section, and accepted standards usually call for this taper to be approximately 18 from the vertical.
  • pipe tool joint 30 when pipe tool joint 30 is seated in the bore 38, it will be limited in.. its downward movement-so that the pipe joint is held against dropping through the elevator and thus supports the depending stand .or section of pipe.
  • the half bore 49 when the door 41 is closed, also assists in supporting the pipe by its joint or box end 30 against such downward movement.
  • the combined seat means 39 and 51 usually will be referred to as a joint seat, although the seat 39 is adequate to retain the pipe box end in the elevator against purely vertical downward movement.
  • the door 41 may be opened by swinging the door outwardly around the hinge pin 42 until a shoulder hits the body 37, as shown at 52, thus serving as a stop to position the door in its opened attitude.
  • the door has a handle 53, and a latch lug 54 adapted to be engaged by the latch 55.
  • the latch 55 is pivoted on a pin or bolt 56 and is urged into the latching position by the spring 57. In other words, when the door is closed the lug 54 strikes the latch 55 and moves past the outer end or margin thereof, allowing the latch to seat in position to hold the door closed.
  • a latch lock 58 which is spring urged to a locking position, is carried on the end of the latch 55 and is mounted thereon by means of a lock pin 5-9 which extends through end lugs ⁇ 61 on the latch 55; and latch lock spring 62 urges the latch lock 58 toward engagement Awith a catch pin 60, into the locking position.
  • Handle 63 which is integral with the latch lock 58 enables the operator to swing the latch lock 58 to the open position at which point a stop 64 will engage the latch 55 and will cause the latch 55 to swing to the open position releasing the door 41 and allowing it to be swung open. This arrangement is generally similar in most respects to that in the above-mentioned Mullinix patent.
  • a door closing nger 65 which is integral with the door ⁇ 41 and is adapted to extend into the opening or throat y40 of the bore 38 when the door 41 is open, and rest in the-recess 66, shown in dotted lines in FIG. 9, when the door is closed, as shown in the broken line phantom position in FIG. 9.
  • a detent 67 which engages a complementary recess 70.
  • a detent is desirable inasmuch as the tilting of the elevator would tend to close the door before the pipe would be in proper position if the door ⁇ was not held in open position.
  • the detent is overcome and releases the door4 when the linger 65 is contacted by the pipe 31 to allow or cause the door to close. The importance of this feature will be more clearly evident from further descripton of the operation of the device.
  • the detent v67 is holding the door open, by the detent engaging recess 70.
  • the description heretofore is primarily directed to structure which is well known and disclosed in the prior art.
  • a cam assembly -68 I which is operable to tilt the elevator automatically for picking up a horizontally racked stand of pipe.
  • the structure comprises upstanding cam arms 69- and 71 which are welded or otherwise attached to, or may be formed integrally with, the body 37.
  • a bolt or shaft '72 Extending between the cam arms -69 and 71 at the upper ends thereof is a bolt or shaft '72 on which is mounted for pivotal movement a counterweighted cam 73, the bottom 74 of which is weighted or constructed so as to be com..
  • cam 73 paratively heavy, and the upper part of which counterweighted cam 73 preferably has a saddle 75 in the form of a V-shaped trough.
  • the cam assembly 68 is preferably positioned on the rear portion of the top of the body 37, spaced from the bore 38 a distance giving clearance with respect to the box end or joint of pipe seated in said bore on seat 39 for the purpose hereinafter sho-wn. It is noted that, because the cam 73 is heavier on the bottom than on the V-shaped trough portion, the V-shaped trough or saddle 75 remains upright unless acted on by forces causing it to move about the shaft 72.
  • the elevator 26 is lowered to a position near the derrick floor, preferably just above the rotary table as shown in FIG. l.
  • the stand of pipe 31 has had its inner or tool joint end 30 lifted by the support 32 and has been moved longitudinally (to the left, as shown in FIG. 1) by use of the dolly 34 or any other convenient means, extending the left-hand end, the tool joint end, of the pipe between the links 25 and 36 a short distance past the elevator, the pipe being above the top of the elevator 26, as indicated in FIGS. 1 and 2.
  • the elevator 26 moving around the pipe 31 to a position where the pipe 31 enters the bore 38 (see FIG. 3), brings the linger 465 into contact with the pipe and causes the finger 65 to move toward the recess 66. This overcomes the detent 67, allowing or causing the door 41 to close and latch, as shown in FIG. 5.
  • the counterweighted cam 73 has remained with its saddle f 75 engaging the pipe 31; and the cam 73 extends generally perpendicular to the pipe 31 in the positions illustrated in FIGS. 3 and 5.
  • the upward movement of the elevator 26 under the influence of the links 25 and 36 caused the elevator to assume the position illustrated in FIG. 5, in Iwhich position the counterweighted cam 73 is generally perpendicular to the pipe 31, the elevator having been placed around the pipe and the door having been automatically closed and latched, thus attaching the elevator firmly to the pipe 31.
  • the stand of pipe 31 has assumed essentially a vertical position and is being supported by the elevator 26.
  • the pipe 31 is ready to be joined to the well string by attaching it to the pipe 28 in the Well-known manner.
  • the elevator is then used to lower the string including the stand 31 into the well, the slips 29 having been released for that purpose.
  • the operator opens the door 41 in the manner previously described and the elevator is released from the string, the slips 29 having been replaced t0 hold the string for attachment of another stand of pipe.
  • the detent 67 engages the recess 70 and the door remains open until the elevator is attached to another stand of pipe. This eliminates the need for the operator to hold the door open while the elevator is placed on the stand.
  • the elevator may be used for lowering the stand into the well, or for laying down pipe in a horizontal racking operation.
  • the cam assembly herein disclosed or its equivalent may be applied to other forms of elevators, with or without the automatic means for closing the door, inasmuch as it is of value for the purpose of tilting the elevator and eliminating the dangers to the operator, and the effort required for that purpose.
  • Other forms of door opening and closure means can be adapted to the arrangement, especially power operated door manipulating devices, without detracting from the merits of the invention disclosed.
  • Other forms of camming devices are feasible, but the device herein shownV is believed to be superior to any other form for the purpose disclosed in respect to the side-opening elevator here illustrated.
  • a well pipe elevator for raising, supporting and lowering pipe, an elevator body; means for lifting said elevator body including a link receiving and retaining means on each side of said elevator body; a bore through said elevator open at the front for the entry and exit of pipe laterally thereof; closure means operable to clear the front of said bore to the lateral entry and exit of pipe with respect thereto, and to close across the front of said bore to retain pipe in said bore against lateral displacement; seat means adapted to receive and support a pipe joint to limit the downward movement of pipe through said bore; those improvements for positioning the elevator to a pipe extending across and above said elevator in a generally horizontal angle aligned with said bore, such as horizontally racked pipe, comprising:
  • cam means mounted on said elevator body and offset to the rear of said bore, said cam means including a pivoted member adapted to engage such pipe, said cam means operable to tilt said elevator to a generally horizontal position.
  • cam means are positioned on the top of said elevator body and extend vertically upwardly therefrom, said cam means being offset to the rear of said elevator in alignment with the closed side of said bore.
  • cam means comprises a pair of upstanding cam arms having shaft means extending therebetween
  • pivoted member comprises a counterweighted cam having a pipe receiving saddle mounted for pivotal movement on said shaft.
  • cam means comprises upstanding support means for said pivoted member, said pivoted member being pivoted to said support means on a horizontal axis olset to the rear of said bore and having a pipe receiving saddle spaced from said axis a distance substantially equal to the distance that said axis is offset to the rear of said bore.
  • an elevator body for raising, supporting and lowering pipe, an elevator body; means receiving and retaining an elevator supporting link on each side of said elevator body; a bore through said elevator open at the front for entry and exit of pipe laterally thereof; closure means movable across the open front of said bore, adapted to open to allow the lateral entry and exit of pipe with respect to said bore, and to close to retain pipe in said bore against lateral displacement; seat means adapted to receive and support a pipe joint to limit the downward movement of said pipe through said bore; those improvements for positioning and attaching the elevator to a horizontally racked pipe comprising:
  • cam means carried by said elevator body on the rear thereof and opposite said open front of said bore, said cam means including a pivoted member adapted to engage a pipe aligned with said bore and extending from front to rear across the top of said elevator body, and to which pipe said elevator is to be latched, and to tilt said elevator with the open front of said bore up when said elevator is raised against said pipe with said closure means open, whereby said bore is moved around said pipe; and
  • cam means comprises spaced upstanding cam arms
  • pivoted member comprises a counterweighted pipe receiving saddle mounted between said cam arms for pivotal movement.
  • said cam means includes spaced upstanding cam arms and said pivoted member comprises a counter-weighted pipe receiving saddle pivotally mounted therebetween, the method wherein said pipe is seated on said saddle by raising said elevator, causing said saddle to pivot in contact with said pipe, and continuing the raising of said elevator whereby said pipe moves vertically downward into said elevator seat, and thereby causing said pipe receiving saddle to disengage from said pipe rendering said cam means inoperative with respect to further handling of said pipe.

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  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Maintenance And Inspection Apparatuses For Elevators (AREA)
  • Lift-Guide Devices, And Elevator Ropes And Cables (AREA)
  • Earth Drilling (AREA)
US748700A 1968-07-30 1968-07-30 Tilting elevator Expired - Lifetime US3494484A (en)

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US74870068A 1968-07-30 1968-07-30

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US3494484A true US3494484A (en) 1970-02-10

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US748700A Expired - Lifetime US3494484A (en) 1968-07-30 1968-07-30 Tilting elevator

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US (1) US3494484A (de)
AT (1) AT290438B (de)
DE (1) DE1938457C3 (de)
FR (1) FR2014782A1 (de)
GB (1) GB1271250A (de)
NL (1) NL6911615A (de)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3795326A (en) * 1972-05-22 1974-03-05 Armco Steel Corp Apparatus for handling drill pipe
US4035012A (en) * 1975-12-31 1977-07-12 Guier William C Dual elevators
US4269554A (en) * 1979-08-14 1981-05-26 Jackson Lewis B Well pipe handling equipment
US4800968A (en) * 1987-09-22 1989-01-31 Triten Corporation Well apparatus with tubular elevator tilt and indexing apparatus and methods of their use
US20080202812A1 (en) * 2007-02-23 2008-08-28 Atwood Oceanics, Inc. Simultaneous tubular handling system
US20100054895A1 (en) * 2008-09-02 2010-03-04 Anderson Vaughn J Casing and rod handler
US20110091304A1 (en) * 2009-10-16 2011-04-21 Friede & Goldman Marketing B.V. Cartridge tubular handling system
US20150361738A1 (en) * 2009-06-22 2015-12-17 Frank's International, Llc Large diameter tubular lifting apparatuses and methods
US20150369034A1 (en) * 2014-06-18 2015-12-24 Sercel Sa Device and method for fast deployment of downhole tool
US20220136342A1 (en) * 2020-11-03 2022-05-05 Huangshan Huaneng Petrochemical Machinery Co., Ltd. Hydraulic rotary side-swing elevator
US11428056B1 (en) 2020-03-11 2022-08-30 Forum Us, Inc. Pipe puller for drilling and service rig pipe handlers

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1135576B8 (de) * 1999-10-01 2009-03-11 Frank's International, Inc. Rohrhebevorrichtung und verfahren zu dessen benutzung
US7303021B2 (en) * 2005-09-20 2007-12-04 Varco I/P, Inc. Wellbore rig elevator systems
DE102006020337A1 (de) * 2006-04-28 2007-10-31 Blohm + Voss Repair Gmbh Vorrichtung zur vertikalen Halterung von Rohren
DE102014110118A1 (de) * 2014-07-18 2016-01-21 Mhwirth Gmbh Vorrichtung zum Halten eines Rohrsegments

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2215649A (en) * 1936-08-03 1940-09-24 Byron Jackson Co Well pipe elevator
US2237856A (en) * 1938-07-11 1941-04-08 William W Wilson Elevator

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2215649A (en) * 1936-08-03 1940-09-24 Byron Jackson Co Well pipe elevator
US2237856A (en) * 1938-07-11 1941-04-08 William W Wilson Elevator

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3795326A (en) * 1972-05-22 1974-03-05 Armco Steel Corp Apparatus for handling drill pipe
US4035012A (en) * 1975-12-31 1977-07-12 Guier William C Dual elevators
USRE29995E (en) * 1975-12-31 1979-05-15 Dual elevators
US4269554A (en) * 1979-08-14 1981-05-26 Jackson Lewis B Well pipe handling equipment
US4800968A (en) * 1987-09-22 1989-01-31 Triten Corporation Well apparatus with tubular elevator tilt and indexing apparatus and methods of their use
US8584773B2 (en) 2007-02-23 2013-11-19 Atwood Oceanics, Inc. Simultaneous tubular handling system and method
US20080202812A1 (en) * 2007-02-23 2008-08-28 Atwood Oceanics, Inc. Simultaneous tubular handling system
US7802636B2 (en) 2007-02-23 2010-09-28 Atwood Oceanics, Inc. Simultaneous tubular handling system and method
US10612323B2 (en) 2007-02-23 2020-04-07 Friede & Goldman United B.V. Simultaneous tubular handling system
US9410385B2 (en) 2007-02-23 2016-08-09 Friede Goldman United, Ltd. Simultaneous tubular handling system
US8186455B2 (en) 2007-02-23 2012-05-29 Atwood Oceanics, Inc. Simultaneous tubular handling system and method
US20100054895A1 (en) * 2008-09-02 2010-03-04 Anderson Vaughn J Casing and rod handler
US7946798B2 (en) * 2008-09-02 2011-05-24 Anderson Vaughn J Casing and rod handler
US20150361738A1 (en) * 2009-06-22 2015-12-17 Frank's International, Llc Large diameter tubular lifting apparatuses and methods
US10006259B2 (en) * 2009-06-22 2018-06-26 Frank's International, Llc Large diameter tubular lifting apparatuses and methods
US8215888B2 (en) 2009-10-16 2012-07-10 Friede Goldman United, Ltd. Cartridge tubular handling system
US8696289B2 (en) 2009-10-16 2014-04-15 Friede Goldman United, Ltd. Cartridge tubular handling system
US9476265B2 (en) 2009-10-16 2016-10-25 Friede Goldman United, Ltd. Trolley apparatus
US20110091304A1 (en) * 2009-10-16 2011-04-21 Friede & Goldman Marketing B.V. Cartridge tubular handling system
US20150369034A1 (en) * 2014-06-18 2015-12-24 Sercel Sa Device and method for fast deployment of downhole tool
US9677395B2 (en) * 2014-06-18 2017-06-13 Sercel, Sa Device and method for fast deployment of downhole tool
US11428056B1 (en) 2020-03-11 2022-08-30 Forum Us, Inc. Pipe puller for drilling and service rig pipe handlers
US20220136342A1 (en) * 2020-11-03 2022-05-05 Huangshan Huaneng Petrochemical Machinery Co., Ltd. Hydraulic rotary side-swing elevator
US11598162B2 (en) * 2020-11-03 2023-03-07 Huangshan Huaneng Petrochemical Machinery Co., Ltd. Hydraulic rotary side-swing elevator

Also Published As

Publication number Publication date
GB1271250A (en) 1972-04-19
DE1938457A1 (de) 1970-02-05
DE1938457B2 (de) 1973-02-22
FR2014782A1 (de) 1970-04-17
AT290438B (de) 1971-06-11
NL6911615A (de) 1970-02-03
DE1938457C3 (de) 1973-09-13

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AS Assignment

Owner name: HUGHES TOOL COMPANY, P.O. BOX 2539, HOUSTON, TX. 7

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:BJ-HUGHES INC.,;REEL/FRAME:004098/0273

Effective date: 19821231