US2986422A - Plate lifting clamp - Google Patents

Plate lifting clamp Download PDF

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Publication number
US2986422A
US2986422A US833163A US83316359A US2986422A US 2986422 A US2986422 A US 2986422A US 833163 A US833163 A US 833163A US 83316359 A US83316359 A US 83316359A US 2986422 A US2986422 A US 2986422A
Authority
US
United States
Prior art keywords
jaw
slot
casing
bolt
clamp
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
Application number
US833163A
Other languages
English (en)
Inventor
Raymond L Renfroc
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.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to GB914831D priority Critical patent/GB914831A/en
Application filed by Individual filed Critical Individual
Priority to US833163A priority patent/US2986422A/en
Priority to DER26801A priority patent/DE1148053B/de
Application granted granted Critical
Publication of US2986422A publication Critical patent/US2986422A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B66C1/48—Gripping members engaging only the external or internal surfaces of the articles and applying frictional forces to vertical edge portions of sheets, tubes, or like thin or thin-walled articles
    • 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
    • Y10S294/901—Plate lifting clamp

Definitions

  • An object of the invention is to provide a clamp having the qualities of efficiency and ruggedness and capable of grasping and lifting plates of various sizes and weights, without marring the surfaces of the plates.
  • An additional object is to provide a clamp having a pivoted jaw, and a secondary jaw of special construction whereby the pivoted jaw has a minimum of movement, i.e. a short stroke.
  • a further object is to provide structure in a clamp which includes the pivoted jaw and a slidable jaw, the said jaws being retained within a unitary type of housing in their various positions of adjustment.
  • Another object is to provide in the penultimate construction a slidable wedge whereby to increase the grasping action of the clamp during the lifting operation, the clamp being so constructed that the heavier the weight, the tighter the grasp of the clamping jaws on the opposite sides of the plate or workpiece.
  • Yet another object is a clamp having a minimum number of parts for a clamp of this type which has both pivoted and slidable jaws for the purpose of grasping a plate on the opposite sides thereof.
  • Figure 1 is a front elevational view of the clamp of this invention
  • Figure 2 is a vertical section of the clamp, taken on the line 22 of Figure 4;
  • Figure 3 is a rear elevational view of the clamp of Figure 1;
  • Figure 4 is a side elevation showing one side of the clamp
  • Figure 5 is a side elevation showing the opposite side of the clamp from that shown in Figure 4;
  • Figure 6 is a perspective view of the wedge jaw construction
  • Figure 7 is a perspective view of the clamp casing with all parts removed
  • Figure 8 is a perspective view of the connecting link with the lifting shackle attached thereto, the latter being partly broken away;
  • Figure 9 is a perspective view of the pivoted jaw.
  • Figure 10 is a perspective view of the wedge adjusting guide nut.
  • the present invention is characterized by its ability to lift heavy loads without marring the surfaces of the plate or other workpiece during the lifting operation.
  • the clamp is of the suspended type, i.e. it preferably is suspended from a traveling hook which is attached to a lifting crane.
  • 10 indicates the housing which, although preferably made from'a singlecast- 2,986,422 Patented May 30, 1961 ing, may be composed of a plurality of parts held together by threaded bolts.
  • the housing 10 comprises a pair of platelike sides 12 and 14 which are held to each other by an integral connecting web 16. It will be noted that the side plates are provided on one side with lower curved ends 18 that extend below the lower curved ends 20, seen in Figures 3 and 4 for instance. The said ends 18 and 20 are spaced from each other for forming a slot 22, the latter being adapted to receive the plates or other workpiece designated by the letter A.
  • the hollow casing 10, as shown in Figure 2, is provided with pivoted jaw 24 having a plate-engaging surface 26.
  • the pivoted jaw has an opening 28 which receives a pin 30 that may be a headed bolt having head 32 at one end and a cotter pin 34 at its opposite end.
  • the pivoted jaw has an upper portion provided with a slot 36 for the reception of a part, such as pin 38 of the connecting link 40. It will be understood, however, that instead of providing a slot on the pivoted jaw 24 and a pin on the connecting link 40, the connecting link 40 may be provided with the slot and the pivoted jaw 24 provided with a pin, without affecting the operation of the pivoted jaw 24.
  • Connecting link 41) is pivotally held in position by a pin 42 which connects the plates 12 and 14 and extends through sleeve 42a, see Figure 2.
  • the opposite endof the link 40 is connected by a pivot 44 to the lifting shackle 46.
  • the upper end of the lifting shackle may be provided with an opening 48, or the shape of the upper end of the shackle may be that of a hook, not shown. However, I prefer to provide the opening 48, which may be engaged by the hook end of a hoist.
  • Stop pins 50 limit the upward swinging movementof the connecting link 48 and thereby restrict the movement of the pivoted jaw into and out of the slot or opening 22.
  • the stop pins 50 also restrict the upward movement of the shackle 46.
  • a sliding wedge 52 having an extended gripping surface 54 which faces the surface 26 of pivoted jaw 24 at the opposite end of the slot.
  • the gripping surface normally extends into the slot as seen in Figures 1 and 2.
  • the wedge 52 is guided in its upward and downward movement of adjustment in the casing 10 by means of a nut 56, as seen in Figures 2, 6 and 10.
  • the sides of the nut 56 are provided with stepped portions 58 that slide on facing grooves 68 of the wedge 52.
  • Nut 56 is further anchored in position by means of a bolt 62 having threads 64 that engage threads 66 of nut 56.
  • Bolt 62 is provided with a knurled head 68 and a hexagonal socket 70 whereby this bolt may be adjusted either by hand or by a socket wrench when using the socket 70.
  • the bolt 62 extends loosely and non-threadedly through the opening 72 of the web 16 that connects side plates IZ-and 14.
  • Wedge 52 is adjustable vertically in the casing 10, as seen in Figure 2, by means of the bolt 74.
  • This bolt is provided with an octagonal head '76 and a screw-threaded shank portion 78 which threadedly engages the nut 80.
  • the sliding wedge 52 has flat sides 82 that clear the flat sides of the side plates 12 and 14 of the housing.
  • the nut 88 is connected to the wedge sides by means of a pin and hole connection shown at 84 in Figures 4 and 6.
  • the bolt 74 is guided by a sleeve 86.
  • This sleeve extends between the upper portions of the plates 12 and 14 and'is held between the side plates 12 and 14 by means of knurled stud members 88 and $8, each one of which threadedly engages the side plates and is provided with a stud member 92, only one of which is shown in Figure 4, that engages a central aperture 94 in the sleeve 86.
  • This sleeve therefore, is rotatable on the stud members 92.
  • Extending transversely through this sleeve, with reference to opening 94 of sleeve 86, is an opening 96 that freely supports and. guides the bolt 74.
  • the bolt is held in position on the sleeve 86 by the head 76, and a locking nut 98, which is held in locking position on the bolt 74 by means of a threaded pin 100.
  • the workpiece A may be inserted in the slot 22.
  • the head 76 of bolt 74 is then engaged by a suitable tool and the bolt is rotated to cause the wedge 52 to move downwardly and inwardly of the slot 22 from the full line position to the dotted line position of Figure 2, for example.
  • the work is firmly engaged between the surface 26 of the pivoted jaw 24 and surface 54 of the wedge 52.
  • the opening 48 of the lifting shackle 46 is now engaged by a hook of the hoist, not shown.
  • the pivoted jaw 24 tends to move from the dotted line position to the full line position, both shown in Figure 2.
  • any tendency of the workpiece to shift or move downwardly would be opposed by the action of the wedge 52 on one side and the pivoted jaw 24 on the opposite side, the result being a positive clamping engagement along an extended surface of the workpiece by the wedge 52 and a positive grasp on the opposite side by the surface 26 of the pivoted jaw 24.
  • An additional locking effect may be had by inserting a socket wrench in the socket 70 and operating the bolt 62 to positively lock the wedge 52 in engagement with the workpiece.
  • the movement of the pivoted jaw 24 may be reduced to a minimum about the pin or pivot 30, in order to positively and graspingly engage the work by the pivoted jaw 24.
  • wedge 52 is both slidingly and pivotally supported in casing 10 by bolt 74 through the threaded engagement of bolt 74 with nut 80, and sleeve 86 with its pivoted supporting stud members 92.
  • the wedge may be caused to pivot and lockingly engage the work in its pivoted movement by means of the engagement of nut 56 by bolt 62.
  • a clamp comprising a housing having sides, said sides having aligned substantially transverse openings forming an upwardly extending slot when the longitudinal axis of said casing is in a vertical plane, a first jaw, means pivoting said jaw in said casing adjacent one side of said slot for movement in said slot whereby to engage the work, means for moving said first jaw into and out of work-engaging position including lever means, one end of said lever means and said first jaw comprising members, one of said members having a slot engaging part and the other of said members having a slot into which said slot engaging part extends, actuating link means adapted to support said casing with its longitudinal axis in a vertical plane, means pivotally connecting the lower end of said actuating link means to the opposite end of said first named lever means from said end connected to said pivoted first jaw, and a second jaw located on the opposite side of said slot from said first jaw and adapted to extend into said first named slot when actuated to thereby engage the work, and means for slidably supporting and adjustably moving said second jaw in said
  • said locking means comprises a bolt mounted in said casing, said bolt having a screw-threaded connection with said second jaw.
  • said means for slidably supporting and adjustably moving said second jaw further includes juxtaposed grooves on said second jaw, a nut having means engaging said grooves, and a bolt supported on said casing threadedly engaging said nut.
  • said means for slidably supporting and adjustably moving said second jaw additionally includes a nut on said wedge, said nut having threads, a bolt having threads adjacent its end engaging said nut, and means for supporting said bolt in said casing comprising a sleeve having an aperture through which said bolt freely extends, said sleeve having a transverse passageway, and stud means engaging said passageway for pivotally supporting said sleeve in said casing.
  • a clamp comprising a housing having sides, said sides having aligned substantially transverse openings forming an upwardly extending slot when the longitudinal axis of said casing is in a vertical plane, a first jaw, means pivoting said jaw in said casing adjacent one side of said slot for movement in said slot whereby to engage the work, means for moving said first jaw into and out oi work-engaging position including lever means, one end of said lever means having a slot engaging part, and said first jaw having a slot into which said slot engaging part extends, actuating link means adapted to support said casing with its longitudinal axis in a vertical plane, means pivotally connecting the lower end of said actuating link means to the opposite end of said first named lever means from said end connected to said pivoted first jaw, and a second jaw located on the opposite side of said slot from said first jaw and adapted to extend into said first named slot when actuated to thereby engage the work, and means for slidably supporting and adjustably moving said second jaw in said casing including a threaded member and
  • said locking means comprises a bolt mounted in said casing, said bolt having a screw-threaded connection with said second jaw.
  • said means for slidably supporting and adjustably moving said second jaw additionally includes cooperating engaging wedge surfaces on said casing and second jaw.
  • said means for slidably supporting and adjustably moving said second jaw further includes juxtaposed grooves on said second jaw, a not having means engaging said grooves, and a bolt supported on said casing threadedly engaging said nut.
  • said means for slidably supporting and adjustably moving said second jaw additionally includes a nut on said wedge, said nut having threads, a bolt having threads adjacent its end engaging said nut, and means for supporting said bolt in said casing comprising a sleeve having an aperture through which said bolt freely extends, said sleeve having a transverse passageway, and stud means engaging said passageway for pivotally supporting said sleeve in said casing.
  • a clamp comprising a housing having sides, said sides having aligned substantially transverse openings forming an upwardly extending slot when the longitudinal axis of said casing is in a vertical plane, a first jaw, means pivoting said jaw in said casing adjacent one side of said slot for movement in said slot whereby to engage the work, means for moving said first jaw into and out of work-engaging position including lever means, one end of said lever means and said first jaw comprising members, one of said members having a slot engaging part and the other of said members having a slot into which said slot engaging part extends, actuating link means adapted to support said casing with its longitudinal axis in a vertical plane, means pivotally connecting the lower end of said actuating link means to the opposite end of said first named lever means from said end connected to said pivoted first jaw, and a second jaw located on the opposite side of said slot from said first jaw and adapted to extend into said first named slot when actuated to thereby engage the work, and means for slidably and pivotally supporting and adjustably moving said second
  • a clamp comprising a housing having sides, said sides having aligned substantially transverse openings forming an upwardly extending slot when the longitudinal axis of said casing is in a vertical plane, a first jaw, means pivoting said jaw in said casing adjacent one side of said slot for movement in said slot whereby to engage the work, means for moving said first jaw into and out of work-engaging position including lever means, one end of said lever means having a stud, and said first jaw having a slot into which said stud extends, actuating link means adapted to support said casing with its longitudinal axis in a vertical plane, means pivotally connecting the lower end of said actuating link means to the opposite end of said first named lever means from said end connected to said pivoted first jaw, and a second jaw located on the opposite side of said slot from said first jaw and adapted to extend into said first named slot when actuated to thereby engage the work, and means for slidably and pivotally supporting and adjustably moving said second jaw in said casing including a threaded member and a

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Clamps And Clips (AREA)
  • Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
  • Load-Engaging Elements For Cranes (AREA)
US833163A 1959-08-12 1959-08-12 Plate lifting clamp Expired - Lifetime US2986422A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB914831D GB914831A (enrdf_load_stackoverflow) 1959-08-12
US833163A US2986422A (en) 1959-08-12 1959-08-12 Plate lifting clamp
DER26801A DE1148053B (de) 1959-08-12 1959-11-26 Greifvorrichtung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US833163A US2986422A (en) 1959-08-12 1959-08-12 Plate lifting clamp

Publications (1)

Publication Number Publication Date
US2986422A true US2986422A (en) 1961-05-30

Family

ID=25263615

Family Applications (1)

Application Number Title Priority Date Filing Date
US833163A Expired - Lifetime US2986422A (en) 1959-08-12 1959-08-12 Plate lifting clamp

Country Status (3)

Country Link
US (1) US2986422A (enrdf_load_stackoverflow)
DE (1) DE1148053B (enrdf_load_stackoverflow)
GB (1) GB914831A (enrdf_load_stackoverflow)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3189377A (en) * 1962-05-21 1965-06-15 Merrill Brothers Steel plate lifting clamps
US3264030A (en) * 1964-08-11 1966-08-02 Albert Herman Clamps
US3824653A (en) * 1973-06-13 1974-07-23 R Sholler Wire grip
US4492401A (en) * 1983-06-14 1985-01-08 J. C. Renfroe And Sons, Inc. Non-marring lifting clamp
EP0233386A1 (en) * 1986-01-13 1987-08-26 Eagle Clamp Co. , Ltd. A lifting clamp
US4818004A (en) * 1987-11-16 1989-04-04 Mcdonnell Douglas Corporation Rotor blade sling
US5772269A (en) * 1996-09-30 1998-06-30 Mcconnell Douglas Corporation Hoisting tool
USD443489S1 (en) 2000-01-13 2001-06-12 Walter Zimmermann Gmbh Hand carrying device for plates
EP1221425A3 (en) * 2001-01-05 2004-02-04 Europromecc Engineering S.n.c., di Trevisan Fabio, Seghetto e Sbabo Self-blocking forceps for raising slabs
US20090166498A1 (en) * 2007-12-28 2009-07-02 Alion Science And Technology Corporation Trailing edge blade clamp
CN104261241A (zh) * 2014-09-12 2015-01-07 上海电气核电设备有限公司 水室隔板起吊装置
US20150225077A1 (en) * 2014-02-10 2015-08-13 Davis Aircraft Products Co., Inc. Helicopter Rotor Blade Clamp
JP2015209319A (ja) * 2014-04-29 2015-11-24 イーグルクランプ株式会社 横吊り用クランプ
EP3208042A1 (fr) 2016-02-22 2017-08-23 Entrepose Group Outil pour le retournement et la manutention de tôles
CN108483244A (zh) * 2018-03-29 2018-09-04 宁波蒙曼生物科技有限公司 一种高效板材搬运装置
US10457422B2 (en) * 2016-12-07 2019-10-29 Sikorsky Aircraft Corporation Weights for water immersion testing

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1221400A (en) * 1916-02-03 1917-04-03 Great Lakes Dredge & Dock Company Gripping device for withdrawing sheet-piling.
US2284006A (en) * 1941-06-13 1942-05-26 Samuel T Mclellan Plate clamp or grapple
US2347361A (en) * 1943-05-11 1944-04-25 Nelson Lee Load hoisting tong
US2347922A (en) * 1943-04-12 1944-05-02 Nelson Lee Hoisting tong
US2360602A (en) * 1944-02-19 1944-10-17 Rodney S Waldrup Plate clamp
US2387408A (en) * 1945-02-01 1945-10-23 Hector V Pertuit Grapple
US2446610A (en) * 1946-08-10 1948-08-10 Joseph C Renfroe Plate lifting clamp
US2461394A (en) * 1946-01-03 1949-02-08 Davila Cloutier Hoist clamp

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE170999C (enrdf_load_stackoverflow) *
US2370411A (en) * 1944-05-19 1945-02-27 Monaco Otino Grapple
DE1772202U (de) * 1958-05-24 1958-08-14 Weser Ag Transportklaue.

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1221400A (en) * 1916-02-03 1917-04-03 Great Lakes Dredge & Dock Company Gripping device for withdrawing sheet-piling.
US2284006A (en) * 1941-06-13 1942-05-26 Samuel T Mclellan Plate clamp or grapple
US2347922A (en) * 1943-04-12 1944-05-02 Nelson Lee Hoisting tong
US2347361A (en) * 1943-05-11 1944-04-25 Nelson Lee Load hoisting tong
US2360602A (en) * 1944-02-19 1944-10-17 Rodney S Waldrup Plate clamp
US2387408A (en) * 1945-02-01 1945-10-23 Hector V Pertuit Grapple
US2461394A (en) * 1946-01-03 1949-02-08 Davila Cloutier Hoist clamp
US2446610A (en) * 1946-08-10 1948-08-10 Joseph C Renfroe Plate lifting clamp

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3189377A (en) * 1962-05-21 1965-06-15 Merrill Brothers Steel plate lifting clamps
US3264030A (en) * 1964-08-11 1966-08-02 Albert Herman Clamps
US3824653A (en) * 1973-06-13 1974-07-23 R Sholler Wire grip
US4492401A (en) * 1983-06-14 1985-01-08 J. C. Renfroe And Sons, Inc. Non-marring lifting clamp
EP0131396A1 (en) * 1983-06-14 1985-01-16 J.C. Renfroe and Sons, Inc. Non-marring lifting clamp
EP0233386A1 (en) * 1986-01-13 1987-08-26 Eagle Clamp Co. , Ltd. A lifting clamp
US4818004A (en) * 1987-11-16 1989-04-04 Mcdonnell Douglas Corporation Rotor blade sling
US5772269A (en) * 1996-09-30 1998-06-30 Mcconnell Douglas Corporation Hoisting tool
USD443489S1 (en) 2000-01-13 2001-06-12 Walter Zimmermann Gmbh Hand carrying device for plates
EP1221425A3 (en) * 2001-01-05 2004-02-04 Europromecc Engineering S.n.c., di Trevisan Fabio, Seghetto e Sbabo Self-blocking forceps for raising slabs
US20090166498A1 (en) * 2007-12-28 2009-07-02 Alion Science And Technology Corporation Trailing edge blade clamp
US7980522B2 (en) 2007-12-28 2011-07-19 Alion Science And Technology Corporation Trailing edge blade clamp
US20150225077A1 (en) * 2014-02-10 2015-08-13 Davis Aircraft Products Co., Inc. Helicopter Rotor Blade Clamp
US9421673B2 (en) * 2014-02-10 2016-08-23 Davis Aircraft Products Co., Inc. Helicopter rotor blade clamp
JP2015209319A (ja) * 2014-04-29 2015-11-24 イーグルクランプ株式会社 横吊り用クランプ
CN104261241A (zh) * 2014-09-12 2015-01-07 上海电气核电设备有限公司 水室隔板起吊装置
EP3208042A1 (fr) 2016-02-22 2017-08-23 Entrepose Group Outil pour le retournement et la manutention de tôles
US10457422B2 (en) * 2016-12-07 2019-10-29 Sikorsky Aircraft Corporation Weights for water immersion testing
CN108483244A (zh) * 2018-03-29 2018-09-04 宁波蒙曼生物科技有限公司 一种高效板材搬运装置

Also Published As

Publication number Publication date
GB914831A (enrdf_load_stackoverflow)
DE1148053B (de) 1963-05-02

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