US3015142A - Friction gripping device - Google Patents
Friction gripping device Download PDFInfo
- Publication number
- US3015142A US3015142A US773885A US77388558A US3015142A US 3015142 A US3015142 A US 3015142A US 773885 A US773885 A US 773885A US 77388558 A US77388558 A US 77388558A US 3015142 A US3015142 A US 3015142A
- Authority
- US
- United States
- Prior art keywords
- shoes
- gripping
- gripping device
- column
- wall
- Prior art date
- 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
Links
- 239000012530 fluid Substances 0.000 description 6
- 239000002184 metal Substances 0.000 description 2
- 235000011449 Rosa Nutrition 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000009194 climbing Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
- E02B17/04—Equipment specially adapted for raising, lowering, or immobilising the working platform relative to the supporting construction
- E02B17/08—Equipment specially adapted for raising, lowering, or immobilising the working platform relative to the supporting construction for raising or lowering
- E02B17/0836—Equipment specially adapted for raising, lowering, or immobilising the working platform relative to the supporting construction for raising or lowering with climbing jacks
- E02B17/0845—Equipment specially adapted for raising, lowering, or immobilising the working platform relative to the supporting construction for raising or lowering with climbing jacks with inflatable clamping rings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C1/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles
- B66C1/10—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by mechanical means
- B66C1/42—Gripping members engaging only the external or internal surfaces of the articles
- B66C1/44—Gripping members engaging only the external or internal surfaces of the articles and applying frictional forces
- B66C1/46—Gripping members engaging only the external or internal surfaces of the articles and applying frictional forces by inflatable elements
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G11/00—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs
- E04G11/06—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs for walls, e.g. curved end panels for wall shutterings; filler elements for wall shutterings; shutterings for vertical ducts
- E04G11/20—Movable forms; Movable forms for moulding cylindrical, conical or hyperbolical structures; Templates serving as forms for positioning blocks or the like
- E04G11/22—Sliding forms raised continuously or step-by-step and being in contact with the poured concrete during raising and which are not anchored in the hardened concrete; Arrangements of lifting means therefor
- E04G11/24—Construction of lifting jacks or climbing rods for sliding forms
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S294/00—Handling: hand and hoist-line implements
- Y10S294/902—Gripping element
Definitions
- the present invention relates to an improved friction gripping device for elongated articles such as columns, pipes and the like.
- the invention is especially suitable for use in a pushing and pulling apparatus such as is described in United States Patent No. 2,830,788 for climbing the columns or caissons slidably inserted through wells in a decked barge to lift the barge above water level so it may serve as a dock.
- FIGURE 1 is a partial plan view
- FIGURE 2 is a vertical sectional view
- FIGURE 3 is a view similar to FIGURE 2 showing a column under stress being gripped by the device of the invention
- FIGURE 4 is an enlarged perspective view of a top or bottom shoe of the device of the invention.
- FIGURE 5 is a view similar to FIGURE 4 of an intermediate shoe.
- FIGURE 6 is a plan view of a modified embodiment of the invention.
- reference numeral 2 designates generally a housing having a continuous annular fluid chamber 4 therein.
- the fluid chamber is open on its inner side and contains a contractible wall or ring 6 of rubber or similar material which forms the inner wall of the chamber.
- Retainer plates 8, 8 are bonded to the top and bottom of the wall 6 and project inwardly of the housing therefrom.
- a plurality of rows of segmental metal gripping blocks or shoes 10 are aligned along the inner face of the wall 6 between the projecting portions of the retainer plates 8, 8.
- the shoes in each row are held together loosely by means of a bolt 12 which extends through oversized holes in the bodies of the shoes.
- the end shoes 10 in each row are cut-away in one outer corner as at 14 to form a shoulder which engages a shoulder 16 formed on the projecting end of each of the retaining plates 8, 8 for positively retaining each row of shoes between the retainer plates and limiting the inwardly movement of the end shoes 10' in each row.
- Each of the shoes 10 and It) is provided with a toothed outer face 18 adapted to engage a column C or other elongated article received in the gripping housing.
- FIGURE 1 The corresponding shoes it or 10' in adjacent rows are spaced apart as shown in FIGURE 1 at 19 so that the shoes can move radially inwardly without binding.
- FIGURES 1, 4 and 5 there are twelve rows of segmental shoes and each shoe has a circular extent of less than 30 degrees so as to provide the spaces 19.
- fluid which may be liquid or gas
- chamber 4 In operation, to grip a column C around which housing 2 has been disposed, fluid, which may be liquid or gas, is admitted under pressure to chamber 4 through a port 4'.
- the fluid pressure causes the inner wall 6 to contract and move slightly laterally and inwardly away from the outer wall of the housing.
- Such movement of the wall 6 causes radial movement of the shoes 10 and 10 so that the shoes, by means of toothed faces 18, take a firm grip on the periphery of column C.
- a cylindrical column or other elongated shell-like member will deflect radially under the application of a radial and longitudinal load.
- the degree of the curve is dependent upon the amount of load applied and the size of the column.
- prior art gripping devices such as is disclosed by the above mentioned Patent No. 2,830,788, are used such curving reduces the effectiveness of the gripping device inasmuch as only a relatively small portion of the gripping surface of the gripping device can engage the periphery of the curved column. This condition occurs because the rigid metal gripping shoes of the gripping device cannot conform to the curved surface of the column under load.
- the segmental gripping shoe arrangement of our invention overcomes this difiiculty since the rows of shoes 18 and In from an articulated gripping surface backed up by the contractible wall 6.
- the articulated gripping surface thus formed permits the toothed shoes 1% and it) to follow the deflection curve of column C, as shown in FIGURE 3, as well as any irregularities that may exist on the outer surface of column C.
- Reference numeral 26 designates, generally a modified embodiment of our invention which is suitable for use in handling columns or other elongated members which are rectangular in cross section.
- the housing 2a is similar in cross section to the embodiment shown in FIGURES 2 and 3 but is rectangular in shape instead of circular and is provided with a fluid chamber containing a contractible wall on opposite sides of the housing. Rows of gripping shoes disposed between retaining plates are provided on each of the two opposite sides of the housing 2a arranged in a manner similar to that shown in FIGURE 2.
- a friction gripping device comprising achamber for fluid adapted to be disposed circumferentially around an elongated member, said chamber having an open inner side adjacent said member, a contractible wall slidable laterally in said chamber closing said open inner side, end plates bonded to the top and bottom of said wall, respectively, and projecting outwardly of said open inner side of said chamber, a plurality of independent rigid gripping shoes mounted between and confined by said end plates and movable with said wall, said shoes being arranged in substantially parallel spaced vertical rows disposed circumfcrentially along said inner wall, the adjacent shoes in each vertical row being separate and movable relative to each other, a bolt extending through oversize holes in the shoes in each row whereby said shoes are retained loosely in substantial axial alignment, said end plates each having a shoulder formed on the projecting portion thereof, and the end shoes in each row adjacent said end plates each being cut away at an outer corner thereof forming a shoulder thereon adapted to engage the shoulder on the end plate adjacent thereto to thereby limit the movement of
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
Description
Jan. 2, 1962 R. A. ROSANOFF ETAL 3,015,142
FRICTION GRIPPING DEVICE Filed Nov. 14, 1958 2 Sheets-Sheet 2 RICHARD A. ROSA/VOFF; LEROY .5. THOMAS A flame? United States Patent 3,015,142 FRICTION GREPPING DEVICE Richard A. Rosanoif, Rosemead, Calif. (16948 E. Pocono, La Puente, Calif), and Leroy S. Thomas, 1448 W: 111th St., Los Angeles, Calif.
Filed Nov. 14, 1958, Ser. No. 773,885 1 Claim. (Cl. 24263) The present invention relates to an improved friction gripping device for elongated articles such as columns, pipes and the like.
The invention is especially suitable for use in a pushing and pulling apparatus such as is described in United States Patent No. 2,830,788 for climbing the columns or caissons slidably inserted through wells in a decked barge to lift the barge above water level so it may serve as a dock.
It is the primary object of the present invention to improve upon the gripping means shown and described by the above patent by providing a friction gripping device having an articulated gripping face which readily conforms to the curved surface of an elongated article deflected under stress.
This and other objects will become more apparent after referring to the following specification and attached drawings, in which:
FIGURE 1 is a partial plan view;
FIGURE 2 is a vertical sectional view;
FIGURE 3 is a view similar to FIGURE 2 showing a column under stress being gripped by the device of the invention;
FIGURE 4 is an enlarged perspective view of a top or bottom shoe of the device of the invention.
FIGURE 5 is a view similar to FIGURE 4 of an intermediate shoe; and
FIGURE 6 is a plan view of a modified embodiment of the invention.
Referring more particularly to the drawings reference numeral 2 designates generally a housing having a continuous annular fluid chamber 4 therein. The fluid chamber is open on its inner side and contains a contractible wall or ring 6 of rubber or similar material which forms the inner wall of the chamber. Retainer plates 8, 8 are bonded to the top and bottom of the wall 6 and project inwardly of the housing therefrom.
A plurality of rows of segmental metal gripping blocks or shoes 10 are aligned along the inner face of the wall 6 between the projecting portions of the retainer plates 8, 8. The shoes in each row are held together loosely by means of a bolt 12 which extends through oversized holes in the bodies of the shoes. The end shoes 10 in each row are cut-away in one outer corner as at 14 to form a shoulder which engages a shoulder 16 formed on the projecting end of each of the retaining plates 8, 8 for positively retaining each row of shoes between the retainer plates and limiting the inwardly movement of the end shoes 10' in each row.
Each of the shoes 10 and It) is provided with a toothed outer face 18 adapted to engage a column C or other elongated article received in the gripping housing.
The corresponding shoes it or 10' in adjacent rows are spaced apart as shown in FIGURE 1 at 19 so that the shoes can move radially inwardly without binding. As best shown in FIGURES 1, 4 and 5 there are twelve rows of segmental shoes and each shoe has a circular extent of less than 30 degrees so as to provide the spaces 19.
In operation, to grip a column C around which housing 2 has been disposed, fluid, which may be liquid or gas, is admitted under pressure to chamber 4 through a port 4'. The fluid pressure causes the inner wall 6 to contract and move slightly laterally and inwardly away from the outer wall of the housing. Such movement of the wall 6 causes radial movement of the shoes 10 and 10 so that the shoes, by means of toothed faces 18, take a firm grip on the periphery of column C.
As is well known, a cylindrical column or other elongated shell-like member will deflect radially under the application of a radial and longitudinal load. The degree of the curve is dependent upon the amount of load applied and the size of the column. When prior art gripping devices, such as is disclosed by the above mentioned Patent No. 2,830,788, are used such curving reduces the effectiveness of the gripping device inasmuch as only a relatively small portion of the gripping surface of the gripping device can engage the periphery of the curved column. This condition occurs because the rigid metal gripping shoes of the gripping device cannot conform to the curved surface of the column under load. Although a resilient collar without rigid gripping shoes could conform to the curved surface of the column, a column under load cannot be supported by a resilient collar alone. The segmental gripping shoe arrangement of our invention overcomes this difiiculty since the rows of shoes 18 and In from an articulated gripping surface backed up by the contractible wall 6. The articulated gripping surface thus formed permits the toothed shoes 1% and it) to follow the deflection curve of column C, as shown in FIGURE 3, as well as any irregularities that may exist on the outer surface of column C.
Reference numeral 26 designates, generally a modified embodiment of our invention which is suitable for use in handling columns or other elongated members which are rectangular in cross section. In this embodiment the housing 2a is similar in cross section to the embodiment shown in FIGURES 2 and 3 but is rectangular in shape instead of circular and is provided with a fluid chamber containing a contractible wall on opposite sides of the housing. Rows of gripping shoes disposed between retaining plates are provided on each of the two opposite sides of the housing 2a arranged in a manner similar to that shown in FIGURE 2.
While one embodiment of our invention has been shown and described, it will be apparent that other adaptations and modifications may be made without departing from the scope of the following claim.
We claim:
A friction gripping device comprising achamber for fluid adapted to be disposed circumferentially around an elongated member, said chamber having an open inner side adjacent said member, a contractible wall slidable laterally in said chamber closing said open inner side, end plates bonded to the top and bottom of said wall, respectively, and projecting outwardly of said open inner side of said chamber, a plurality of independent rigid gripping shoes mounted between and confined by said end plates and movable with said wall, said shoes being arranged in substantially parallel spaced vertical rows disposed circumfcrentially along said inner wall, the adjacent shoes in each vertical row being separate and movable relative to each other, a bolt extending through oversize holes in the shoes in each row whereby said shoes are retained loosely in substantial axial alignment, said end plates each having a shoulder formed on the projecting portion thereof, and the end shoes in each row adjacent said end plates each being cut away at an outer corner thereof forming a shoulder thereon adapted to engage the shoulder on the end plate adjacent thereto to thereby limit the movement of said end shoes outwardly of said chamber.
(References on foliowing page) References Cited in the file of this patent UNITED STATES PATENTS Townsend June 1, 1926 Kaough Mar. 11, 1930 McLagan Dec. 1, 1931 Fortune Dec. 25, 1934 Church Feb. 11, 1936 Fontaine June 24, 1941 UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent N0 3 015, 1 42 January 2;, 1962 Richard A5 Rosancff at al,
It is hereby certified that error appears in the above numbered petent requiring correction and that the said Letters Patent should read ee corrected below.
Column .2 line 24,, for "from" read form "a Signed and sealed this 1st day of May 1962.,
(SEAL) Attest:
ERNEST w TSWIDER DAVID LADD Attesting Officer 7 Commissioner of Patents
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US773885A US3015142A (en) | 1958-11-14 | 1958-11-14 | Friction gripping device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US773885A US3015142A (en) | 1958-11-14 | 1958-11-14 | Friction gripping device |
Publications (1)
Publication Number | Publication Date |
---|---|
US3015142A true US3015142A (en) | 1962-01-02 |
Family
ID=25099625
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US773885A Expired - Lifetime US3015142A (en) | 1958-11-14 | 1958-11-14 | Friction gripping device |
Country Status (1)
Country | Link |
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US (1) | US3015142A (en) |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3229619A (en) * | 1962-08-24 | 1966-01-18 | Machf A Bijlenga Nv | Press |
US3343371A (en) * | 1965-01-25 | 1967-09-26 | Mcdermott & Co Inc J Ray | Locking device for establishing a loadbearing joint between two structures |
FR2386720A1 (en) * | 1977-04-08 | 1978-11-03 | Menard Louis | Hydraulic grab for heavy tubular object - has flexible wall inflated hydraulically for clamping object radially |
DE3508839A1 (en) * | 1985-03-13 | 1986-09-18 | Alfred Teves Gmbh, 6000 Frankfurt | Friction-lining carrier with exchangeable friction linings, in particular for full disc brakes |
US4713952A (en) * | 1986-02-05 | 1987-12-22 | Westinghouse Electric Corp. | Tool and method for rotopeening the peripheral tubes in a tubesheet |
US5451084A (en) * | 1992-09-03 | 1995-09-19 | Weatherford/Lamb, Inc. | Insert for use in slips |
US5730471A (en) * | 1995-12-09 | 1998-03-24 | Weatherford/Lamb, Inc. | Apparatus for gripping a pipe |
US6082224A (en) * | 1997-01-29 | 2000-07-04 | Weatherford/Lamb, Inc. | Power tong |
US6332377B1 (en) | 1997-01-30 | 2001-12-25 | Weatherford/Lamb, Inc. | Gripping arrangement for gripping casing |
US20040194967A1 (en) * | 2003-02-27 | 2004-10-07 | Manfred Jaensch | Insert for gripping apparatus |
EP1889998A1 (en) * | 2003-02-27 | 2008-02-20 | Weatherford/Lamb, Inc. | Insert for gripping apparatus |
WO2009112853A2 (en) * | 2008-03-13 | 2009-09-17 | National Oilwell Varco, L.P. | Gripping element for gripping a tubular in the construction and maintenance of oil and gas wells |
US10695904B2 (en) * | 2017-12-19 | 2020-06-30 | Yanshan University | Bionic pneumatic soft gripping device |
Citations (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1586923A (en) * | 1924-02-18 | 1926-06-01 | Elvin E Townsend | Well-drilling equipment |
US1749945A (en) * | 1928-06-07 | 1930-03-11 | Joseph W Kaough | Sectional wedge slip |
US1834316A (en) * | 1929-12-07 | 1931-12-01 | Abegg & Reinhold Co | Drill pipe slip |
US1985367A (en) * | 1933-05-09 | 1934-12-25 | James C Fortune | Drive for drill pipe |
US2030499A (en) * | 1933-11-10 | 1936-02-11 | Walter L Church | Slip |
US2247168A (en) * | 1940-02-21 | 1941-06-24 | Robert A Fontaine | Brick grab |
US2298507A (en) * | 1939-10-06 | 1942-10-13 | Arthur J Penick | Elevator |
US2589101A (en) * | 1948-03-23 | 1952-03-11 | Goodrich Co B F | Lift truck fork tube |
US2609113A (en) * | 1948-03-16 | 1952-09-02 | Service Caster And Truck Corp | Fork structure for lift trucks and hoists |
US2708994A (en) * | 1951-03-23 | 1955-05-24 | Gen Tire & Rubber Co | Expanded clutch |
US2756883A (en) * | 1953-06-17 | 1956-07-31 | Irvin F Schreck | Vat lifting and dumping truck |
US2830788A (en) * | 1954-09-10 | 1958-04-15 | United States Steel Corp | Pushing and pulling apparatus |
US2864148A (en) * | 1957-01-28 | 1958-12-16 | Jersey Prod Res Co | Safety collar |
US2934804A (en) * | 1955-03-17 | 1960-05-03 | De Long Corp | Releasable gripper for jack assemblies |
-
1958
- 1958-11-14 US US773885A patent/US3015142A/en not_active Expired - Lifetime
Patent Citations (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1586923A (en) * | 1924-02-18 | 1926-06-01 | Elvin E Townsend | Well-drilling equipment |
US1749945A (en) * | 1928-06-07 | 1930-03-11 | Joseph W Kaough | Sectional wedge slip |
US1834316A (en) * | 1929-12-07 | 1931-12-01 | Abegg & Reinhold Co | Drill pipe slip |
US1985367A (en) * | 1933-05-09 | 1934-12-25 | James C Fortune | Drive for drill pipe |
US2030499A (en) * | 1933-11-10 | 1936-02-11 | Walter L Church | Slip |
US2298507A (en) * | 1939-10-06 | 1942-10-13 | Arthur J Penick | Elevator |
US2247168A (en) * | 1940-02-21 | 1941-06-24 | Robert A Fontaine | Brick grab |
US2609113A (en) * | 1948-03-16 | 1952-09-02 | Service Caster And Truck Corp | Fork structure for lift trucks and hoists |
US2589101A (en) * | 1948-03-23 | 1952-03-11 | Goodrich Co B F | Lift truck fork tube |
US2708994A (en) * | 1951-03-23 | 1955-05-24 | Gen Tire & Rubber Co | Expanded clutch |
US2756883A (en) * | 1953-06-17 | 1956-07-31 | Irvin F Schreck | Vat lifting and dumping truck |
US2830788A (en) * | 1954-09-10 | 1958-04-15 | United States Steel Corp | Pushing and pulling apparatus |
US2934804A (en) * | 1955-03-17 | 1960-05-03 | De Long Corp | Releasable gripper for jack assemblies |
US2864148A (en) * | 1957-01-28 | 1958-12-16 | Jersey Prod Res Co | Safety collar |
Cited By (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3229619A (en) * | 1962-08-24 | 1966-01-18 | Machf A Bijlenga Nv | Press |
US3343371A (en) * | 1965-01-25 | 1967-09-26 | Mcdermott & Co Inc J Ray | Locking device for establishing a loadbearing joint between two structures |
FR2386720A1 (en) * | 1977-04-08 | 1978-11-03 | Menard Louis | Hydraulic grab for heavy tubular object - has flexible wall inflated hydraulically for clamping object radially |
DE3508839A1 (en) * | 1985-03-13 | 1986-09-18 | Alfred Teves Gmbh, 6000 Frankfurt | Friction-lining carrier with exchangeable friction linings, in particular for full disc brakes |
US4713952A (en) * | 1986-02-05 | 1987-12-22 | Westinghouse Electric Corp. | Tool and method for rotopeening the peripheral tubes in a tubesheet |
US5451084A (en) * | 1992-09-03 | 1995-09-19 | Weatherford/Lamb, Inc. | Insert for use in slips |
US5730471A (en) * | 1995-12-09 | 1998-03-24 | Weatherford/Lamb, Inc. | Apparatus for gripping a pipe |
US6082224A (en) * | 1997-01-29 | 2000-07-04 | Weatherford/Lamb, Inc. | Power tong |
US6332377B1 (en) | 1997-01-30 | 2001-12-25 | Weatherford/Lamb, Inc. | Gripping arrangement for gripping casing |
US20040194967A1 (en) * | 2003-02-27 | 2004-10-07 | Manfred Jaensch | Insert for gripping apparatus |
US7231984B2 (en) | 2003-02-27 | 2007-06-19 | Weatherford/Lamb, Inc. | Gripping insert and method of gripping a tubular |
EP1889998A1 (en) * | 2003-02-27 | 2008-02-20 | Weatherford/Lamb, Inc. | Insert for gripping apparatus |
WO2009112853A2 (en) * | 2008-03-13 | 2009-09-17 | National Oilwell Varco, L.P. | Gripping element for gripping a tubular in the construction and maintenance of oil and gas wells |
WO2009112853A3 (en) * | 2008-03-13 | 2010-09-10 | National Oilwell Varco, L.P. | Gripping element for gripping a tubular in the construction and maintenance of oil and gas wells |
CN102016221A (en) * | 2008-03-13 | 2011-04-13 | 国民油井华高有限合伙公司 | Gripping element for gripping a tubular in the construction and maintenance of oil and gas wells |
CN102016221B (en) * | 2008-03-13 | 2014-11-05 | 国民油井华高有限合伙公司 | Gripping element for gripping a tubular in the construction and maintenance of oil and gas wells |
US10695904B2 (en) * | 2017-12-19 | 2020-06-30 | Yanshan University | Bionic pneumatic soft gripping device |
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