US3680907A - Tiltable lifting tongs - Google Patents

Tiltable lifting tongs Download PDF

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Publication number
US3680907A
US3680907A US145716A US3680907DA US3680907A US 3680907 A US3680907 A US 3680907A US 145716 A US145716 A US 145716A US 3680907D A US3680907D A US 3680907DA US 3680907 A US3680907 A US 3680907A
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United States
Prior art keywords
jaw member
tong lever
support arm
grappling
tong
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
US145716A
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English (en)
Inventor
Robert V Siegwart
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.)
Heppenstall Co
Blaw Knox Corp
Original Assignee
Heppenstall Co
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Filing date
Publication date
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Publication of US3680907A publication Critical patent/US3680907A/en
Assigned to MESTA AND MELLON BANK, N.A. reassignment MESTA AND MELLON BANK, N.A. SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MESTA MACHINE COMPANY
Assigned to WHITE CONSOLIDATED INDUSTRIES, A DE CORP. reassignment WHITE CONSOLIDATED INDUSTRIES, A DE CORP. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: MESTA MACHINE COMPANY
Assigned to BLAW KNOX CORPORATION, A CORP OF DELAWARE reassignment BLAW KNOX CORPORATION, A CORP OF DELAWARE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: WHITE CONSOLIDATED INDUSTRIES, INC., A CORP OF DE.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • B66C1/485—Coil lifting devices

Definitions

  • the specification discloses tiltable lifting tongs of the type having opposing grappling jaws for grasping and releasing a load, such as a coil of sheet steel, and having a power driven cable sling for tilting the tongs through an angle, such as 90, to correspondingly change the orientation of the load between pick-up and set-down thereof.
  • a toggle linkage is employed whereby the load reaction force acting in the cable sling is applied to one of the tong levers controlling the gripping pressure of the grappling jaws in such a manner as to provide an amplification of the forces exerted on the tong lever and also to maintain a substantially constant and near maximum lever arm ratio therefor throughout the entire angle of change in orientation.
  • This invention relates to tiltable lifting tongs of the type having opposed jaws for grasping and releasing a load, such as a coil of sheet steel or aluminum, and operable to change the orientation of the load between pick-up and set-down.
  • Tiltable lifting tongs heretofore known, as exemplified by that described in U.S. Pat. No. 3,436,l16issued Apr. 1, 1969 to J. R. Anderson and assigned to the assignee of this invention, are known and used in industries.
  • the strip In the steel industry, by reason of the orientation of strip mills and processing lines, the strip is necessarily coiled on a horizontal axis to form a coil which is ordinarily banded to hold it in the form of a coil.
  • Such coils are of varying weight, and may attain weights as high as one hundred thousand pounds.
  • the coils are wound on a horizontal axis because of mill designs, and are wound on a horizontal axis because of mill designs, and are unwound on a horizontal axis for the same reason, the coils are preferably stacked with the coil axis in a vertical position to avoid rolling and possible breaking of the bands.
  • the tiltable tongs illustrated in U.S. Pat. No. 3,436,116 provided a desirable improvement over the tilting apparatus theretofore employed for the purpose of changing the coils from a horizontal to a vertical orientation.
  • the existing tiltable tongs are provided with an adjustable outboard tilting leg extension to obtain full capacity or effectiveness of the turning torque designed into the unit.
  • variations in the material and gripping areaof the outer gripping shoe may be had to accommodate highly finished or soft material type of coils.
  • the inherent design of the existing tiltable tongs with respect to the manner of application of load reaction force to the tong levers is such, however, that the gripping force on a coil during the transition from horizontal axis orientation to vertical axis orientation may not provide the necessary factor of safety under certain conditions, especially when the operating personnel endeavor to employ the lifting tongs under circumstances where the weight of the coil is excessive in relation to the capacity of the unit, or when the gripping jaws are unsuited to the material of which the coils are made.
  • I provide means for applying the load reaction force to one of the tong levers controlling the gripping force of the movable grappling jaw so as to intensify the effective gripping force and thereby insure an adequate factor of safety.
  • a toggle linkage by which the load reaction force is applied to the tong lever controlling the gripping force of the movable grappling jaw, thereby to effect an amplification of the force to which the tong lever is subject under minimum load reaction force conditions while limiting to a small amount the increase in the force on the tong lever under conditions of greatest load traction force.
  • the lever arm ratio by which the tong lever applies force to the movable grappling jaw is maintained substantially constant throughout the entire angle of change in orientation.
  • FIGS. 1, 2 and 3 are elevational views showing tiltable lifting tongs, embodying the invention, in the respective positions assumed by the unit with the axis of the coil in a horizontal, an inclined and a vertical position;
  • FIGS. 4, 5 and 6 are elevational views showing tiltable lifting tongs of the prior design in positions corresponding respectively to the positions shown in FIGS. 1, 2 and 3.
  • the unit is generally designated by reference numeral 10 and includes a grappling arm portion 12 having a rigid base member 14 made up of two laterally spaced parallel angle plates 15, only one of which is shown.
  • Base member 14 supports an inner grappling jaw 16 which is suitably fixed thereto.
  • An outer grappling jaw 17 is supported by base member 14 in spaced relation to the inner jaw 16 and is reciprocatively movable with respect thereto for gripping therebetween the wall of a coil 18 of sheet steel.
  • Outer jaw 17 is pivotally mounted on one end of an L-shaped grappling arm 20, made up of two parallel spaced plates.
  • the other end of the arm 20 extends between the plates 15 of base member 14 and is suitably slidably arranged therein.
  • a power drive assembly including a reversible electric motor (not shown).
  • the power drive assembly also includes a screw and nut arrangement via which movement of the outer grappling jaw 17 with respect to the inner jaw 16 is effected.
  • a generally L-shaped lever arm 50 consisting of two laterally spaced identical plates only one of which is shown, has a long leg that extends longitudinally of the base member 14 and to one side of the housing member 41.
  • Lever arm 50 has a short leg that is pivotally connected to a thrust block (not shown), at a point designated by the reference numeral 51, the thrust block in turn being slidably supported by a key and slot arrangement between the two side plates of grappling arm 20.
  • the long leg of lever arm 50 is connected by a link member 54, comprising two identical laterally spaced plates, to the base member 14.
  • One end of the link 54 is pivotally connected to the base member and the other end is pivotally connected to the lever arm by a pin 56 which slides in a longitudinally extending closed slot 55 adjacent the end of the two side plates of link 54. Slots'55 define the limits of movement of lever arm 50 relative to the base member 14.
  • Lever arm 50 has a main pivot pin 53 by which a pivotal connection is formed with a support arm 57.
  • Support arm 57 comprises two laterally spaced L- shaped plates, one of which is shown.
  • Each of the side plates of support arm 57 has an arm fixed to the inner face of a corresponding one of the angle plates forming base member 14.
  • Each of the side plates of support arm 57 also has a leg transverse to the base member and paralleling the movable grappling jaw 17.
  • Suitably secured, as by a key and slot arrangement, between the side plates of the support arm 57 is an adjustable extension member 66.
  • Suspending means 74 Disposed above the grappling arm portion 12 of the lifting tongs assembly 10 is a suspending means 74 in the form of a power-driven sling arrangement.
  • Suspending means 74 comprises a housing which includes two laterally spaced generally triangular plates 78, only one of which is shown. At the upper end of plates 78 are coaxial openings in which a tubular generally cylindrical shaped spool 80 is fixedly supported. Spool 80 is necked at its midpoint between plates 78 to accommodate a crane hook 83.
  • a pair of toothed drive sprockets 96 Suitably mounted externally with respect to the plates 78 are a pair of toothed drive sprockets 96, only one of which is shown.
  • Sprockets 96 are keyed to opposite ends of the output shaft of a speed reducer (not shown) which is, in turn, driven by a reversible electric motor (not shown).
  • the speed reducer and the electric motor are suitably mounted between the plates 78 in parallel relation to each other and operatively connected as specifically described in US. Pat. No. 3,436,116.
  • each of the plates 78 Rotatably mounted externally of each of the plates 78 are a pair of identically shaped idler sprockets 102, in laterally spaced coplanar relation to each other and with respect to the drive sprocket 96 on the corresponding side of the suspension means housing plates
  • a pair of identical roller chains 107 are provided by which to suspend the grappling portion assembly from the suspension means, one chain for each side of the suspension means. Since the connections and path of each roller chain 107 are in parallel and similar, only the connections and path for one chain will be here described.
  • one end of a chain 107 is suitably connected to the end of the extension member 66 on support arm 57, thence it is reaved around the inner surface of one idler sprocket 102, over the drive sprocket 96, and returning back on the inner side of the second idler sprocket 102 and outwardly of the suspension means, over a support shaft or pin 71 on the support arm 57, and back to the end of lever arm 50 where it is suitably pivotally anchored.
  • roller chains 107 there are provided a pair of identical wire ropes similarly connected at opposite ends to support arm 57 and lever arm 50 and reaved around pulleys coaxially mounted and keyed to the same shafts as the sprockets 102 and 96.
  • a so-called toggle link 110 is provided between the base member 14 and the free outer end of lever arm 50.
  • Toggle link 110 comprises two arms 111 and 112, each arm consisting of two laterally spaced parallel elements only one of which is shown. Arms 111 and 112 are pivotally connected together by a suitable hinge pin 113 extending through cooperating ends thereof. The other end ,of arm 111 is pivotally connected by a suitable pin to a clevis bracket 114 attached to base member 14. The other end of arm 112 is pivotally connected, as by a suitable pin-1 15, to the outer end of lever arm 50.
  • a pair of roller chains 107 and wire cables (not shown) are provided by which to suspend the grappling portion assembly, in a manner similar to that described for the prior design of FIG. 4.
  • the one end of roller chains 107 and of counterpart wire cables are connected pivotally to the hinge pin 113 coupling the two arms of toggle link 1 10.
  • the moment arm for the load reaction force effective on the lever arm 50 is designated by the reference letter D and shown in each of the Figures of the drawings.
  • the moment arm of the gripping force applied to grappling jaw 17 is designated by the reference letter d and shown in each of the Figures.
  • the force moments active may be expressed by the equation:
  • leverage ratio refers to the ratio of the moment arms D and d. As will be evident from equation (2), therefore, the gripping force exerted by the grappling jaw 17 is proportional to the leverage ratio D/d.
  • connection of the roller chain 107 and wire cables to the toggle link 110 causes an amplification of the force effectively exerted by the load reaction force on the lever arm 50, by reason of the relatively greater component of force applied norma] to lever arm 50 instead of longitudinally thereof as in the case of the prior design shown in FIGS. 4, 5 and 6.
  • FIGS. 4, 5 and 6 it will be apparent by inspection of the relative lengths of moment arms D and d in these Figures that in FIGS. 4 and 5 the leverage ratio D/d is approximately equal to 1, whereas in FIG. 6 the leverage ratio D/d is equal to a multiple of 1. Thus in the prior design of tilting lifting tongs, the leverage ratio D/d does not begin to increase greatly over 1 until the inclination of the axis of coil 18 approaches the vertical position shown in FIG. 6.
  • the leverage ratio D/d is a multiple of 1 regardless of the orientation of the axis of coil 18.
  • the leverage ratio D/d is a substantially uniform value starting with the horizontal position of the axis of the coil 18, through all angles of inclination of the coil axis up to and including the vertical position of the coil axis shown in FIG. 3.
  • the characteristic essential to operativeness of the toggle link 110 lies in the arms 111 and 112 always remaining at angle to each other which is less than 180, for should the arms 111 and 112 become aligned at 180 or pass such point of alignment the efiective force on the tong lever 50 is lost or even reversed.
  • the slotted link member 54 thus serves the additional function of insuring the maintaining of the arms of the toggle link 110 always at an angle less than 180 by reason of the fact that the length of the slot 55 in the link member 54 prevents sufficient outward movement of the end of lever 50 to allow the arms of the toggle link 110 to reach an aligned position.
  • toggle link 110 remains constantly effectively to exert an amplified component of the load reaction force on the end of lever 50.
  • the embodiment of tiltable lifting tongs constructed according to the invention functions in exactly the same manner as the prior design so far as pickup, tilting and release of the coil 18 is concerned.
  • pick-up of the coil may be effected by placing the grappling jaws l6 and 17 in straddling relation to the wall of the coil, energizing the motor in housing member 41 to shift grappling jaw 17 toward the fixed jaw 16 to effect a gripping of the wall of the coil, and elevating the suspension means 74 by means of the crane.
  • the load reaction force effective in the roller chains 107 and paralleling wire cables on the lever arm 50 causes application of substantially the maximum gripping force by grappling jaw 17 to support the coil.
  • energization of the tilting motor in the suspension means 74 causes shortening of one end of the roller chains 107 and lengthening of the other end, thereby shifting the coil axis through a substantially angle to the vertical position shown in FIG. 3.
  • Reversal of the motor in housing 41 may be effected to move the grappling jaw 17 away from fixed jaw 16, thus releasing the grip on the coil wall and allowing the lifting tong assembly 10 to be elevated away from the coil.
  • the tiltable lifting tongs embodying a toggle link whereby the load reaction force is applied to the lever arm of the grappling portion not only provides a greater effective force applicable to the movable grappling jaw for the same weight of load but also maintains a substantially uniform leverage ratio for the grappling portion regardless of the orientation of the axis of the coil being lifted, thereby obviating the possibility of slippage of the grappling jaws on the coil at a critical angle of inclination of the coil axis.
  • Tiltable lifting tongs comprising a grappling portion having a fixed jaw member and a cooperating jaw member movable with respect to said fixed jaw member to grip a load element therebetween or to release said load element, a support arm,a tong lever pivoted on said support arm so as to activate said movable jaw member, and suspension means including flexible elongated means connected at its opposite ends to said support arm and to said tong lever whereby to support said grappling portion, wherein the improvement comprises toggle linkage interposed between the flexible elongated means and the tong lever.
  • Tiltable lifting tongs according to claim 1, wherein the said grappling portion comprises an elongated base member on which the said support arm is fixed, and wherein said toggle linkage comprises a pair of members, hinged together at an angle less than one member being anchored to said base member and the other member being anchored to said tong lever, the load reaction force in said flexible elongated means being effectively exerted at the hinge of the toggle linkage to intensify the gripping force exerted by the tong lever on the movable jaw member.
  • Tiltable lifting tongs according to claim 2, wherein a slotted link member connected between said base member and said tong lever limits the relative movement of the hinged members so as to maintain the angle between the hinged members always less than 180.
  • Tiltable lifting tongs comprising a grappling portion having a fixed jaw member and a movable jaw member in substantially parallel relation to each other, power means for moving said movable jaw member relative to said fixed jaw member to grip a load element therebetween or to release said load element, a support arm, a tong lever pivoted on said support arm so as to activate said movable jaw member; a suspension portion having flexible elongated means connected at its opposite ends to said support arm and to said tong lever whereby to support said grappling portion, said tong lever being activated responsively to the load reaction force thereon to apply a gripping force to said movable jaw member, and power driven means for shifting said flexible elongated means longitudinally in opposite directions to effect corresponding tilting of the grappling portion and the load supported thereby, wherein the improvement comprises toggle linkage via which the load reaction force in the flexible elongated means is applied to said tong lever.
  • Tiltable lifting tongs according to claim 4, wherein the said grappling portion comprises an elongated base member on which the said support arm is fixed, and wherein the said toggle linkage comprises two members hinged together at an angle less than 180, one of said

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Load-Engaging Elements For Cranes (AREA)
  • Manipulator (AREA)
US145716A 1971-05-21 1971-05-21 Tiltable lifting tongs Expired - Lifetime US3680907A (en)

Applications Claiming Priority (1)

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US14571671A 1971-05-21 1971-05-21

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US145716A Expired - Lifetime US3680907A (en) 1971-05-21 1971-05-21 Tiltable lifting tongs

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US (1) US3680907A (it)
CA (1) CA935472A (it)
DE (1) DE2220639C3 (it)
FR (1) FR2138716B1 (it)
GB (1) GB1362760A (it)
IT (1) IT952409B (it)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4492402A (en) * 1983-03-28 1985-01-08 Bradley Lifting, Corp. Coil up-ending grab
US4611844A (en) * 1984-06-16 1986-09-16 Industriewerk Nachf. Seifert & Co. Kg Tilting harness for handling heavy rolls
US5059087A (en) * 1989-05-15 1991-10-22 Murata Kikai Kabushiki Kaisha Bobbin conveying system
US6056340A (en) * 1998-08-31 2000-05-02 Ingersoll-Rand Company Load-handling apparatus with end effector and center-of-gravity shifting device
US20040161324A1 (en) * 2002-12-10 2004-08-19 Illinois Tool Works, Inc. Clamp for coil handler device
US20040217610A1 (en) * 2003-05-01 2004-11-04 Hollman Bert D. Coil hook
US8480145B2 (en) * 2011-10-10 2013-07-09 Eastall Precision Engineering Pty Ltd. Vertical bore coil lifting apparatus
WO2021064451A1 (en) * 2019-10-02 2021-04-08 Arcelormittal System and method for handling semi-finished metal products
US20210310465A1 (en) * 2018-07-26 2021-10-07 Deme Offshore Be Nv Coupling Tool for Connection to an Outer End of a Tubular Element for Upending the Element
US20220041418A1 (en) * 2020-08-04 2022-02-10 Corbins Service Electric, LLC Spool tipper systems and methods

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2534235A1 (fr) * 1982-10-12 1984-04-13 Siamp Cedap Reunies Pince pour la manutention de bobines
GB2240084A (en) * 1990-01-05 1991-07-24 Fielden Engineers Limited Improvements in or relating to load handling
CN102897517B (zh) * 2012-09-29 2014-12-10 王志敏 立卧钢卷在线翻卷装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2945609A (en) * 1959-04-23 1960-07-19 Cullen Friestedt Company Coil lifting and positioning mechanism
US3076674A (en) * 1960-07-21 1963-02-05 Heppenstall Co Tongs
US3436116A (en) * 1967-07-12 1969-04-01 Heppenstall Co Tiltable lifting tongs

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2945609A (en) * 1959-04-23 1960-07-19 Cullen Friestedt Company Coil lifting and positioning mechanism
US3076674A (en) * 1960-07-21 1963-02-05 Heppenstall Co Tongs
US3436116A (en) * 1967-07-12 1969-04-01 Heppenstall Co Tiltable lifting tongs

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4492402A (en) * 1983-03-28 1985-01-08 Bradley Lifting, Corp. Coil up-ending grab
US4611844A (en) * 1984-06-16 1986-09-16 Industriewerk Nachf. Seifert & Co. Kg Tilting harness for handling heavy rolls
US5059087A (en) * 1989-05-15 1991-10-22 Murata Kikai Kabushiki Kaisha Bobbin conveying system
US6056340A (en) * 1998-08-31 2000-05-02 Ingersoll-Rand Company Load-handling apparatus with end effector and center-of-gravity shifting device
US6966739B2 (en) * 2002-12-10 2005-11-22 Illinois Tool Works, Inc. Clamp for coil handler device
US20040161324A1 (en) * 2002-12-10 2004-08-19 Illinois Tool Works, Inc. Clamp for coil handler device
US20040217610A1 (en) * 2003-05-01 2004-11-04 Hollman Bert D. Coil hook
US8480145B2 (en) * 2011-10-10 2013-07-09 Eastall Precision Engineering Pty Ltd. Vertical bore coil lifting apparatus
US20210310465A1 (en) * 2018-07-26 2021-10-07 Deme Offshore Be Nv Coupling Tool for Connection to an Outer End of a Tubular Element for Upending the Element
US11828265B2 (en) * 2018-07-26 2023-11-28 Deme Offshore Be Nv Coupling tool for connection to an outer end of a tubular element for upending the element
WO2021064451A1 (en) * 2019-10-02 2021-04-08 Arcelormittal System and method for handling semi-finished metal products
CN114222713A (zh) * 2019-10-02 2022-03-22 安赛乐米塔尔公司 用于处理金属半成品的系统和方法
US12448253B2 (en) 2019-10-02 2025-10-21 Arcelormittal System and method for handling semi-finished metal products
US20220041418A1 (en) * 2020-08-04 2022-02-10 Corbins Service Electric, LLC Spool tipper systems and methods
US11897739B2 (en) * 2020-08-04 2024-02-13 Corbins, LLC Spool tipper systems and methods

Also Published As

Publication number Publication date
DE2220639B2 (de) 1974-06-20
DE2220639A1 (de) 1972-11-30
CA935472A (en) 1973-10-16
FR2138716B1 (it) 1976-08-06
IT952409B (it) 1973-07-20
DE2220639C3 (de) 1979-02-08
FR2138716A1 (it) 1973-01-05
GB1362760A (en) 1974-08-07

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AS Assignment

Owner name: MESTA AND MELLON BANK, N.A., MELLON SQUARE, PITTSB

Free format text: SECURITY INTEREST;ASSIGNOR:MESTA MACHINE COMPANY;REEL/FRAME:003861/0980

Effective date: 19810529

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Owner name: WHITE CONSOLIDATED INDUSTRIES, A DE CORP.,OHIO

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Owner name: WHITE CONSOLIDATED INDUSTRIES, CLEVELAND, OH A DE

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Effective date: 19830929

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Owner name: BLAW KNOX CORPORATION, ONE OLIVER PLAZA, PITTSBURG

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST. EFFECTIVE SEPT. 27, 1985;ASSIGNOR:WHITE CONSOLIDATED INDUSTRIES, INC., A CORP OF DE.;REEL/FRAME:004532/0913

Effective date: 19851017