US3582128A - Lifting tongs for handling heavy products - Google Patents

Lifting tongs for handling heavy products Download PDF

Info

Publication number
US3582128A
US3582128A US724816A US3582128DA US3582128A US 3582128 A US3582128 A US 3582128A US 724816 A US724816 A US 724816A US 3582128D A US3582128D A US 3582128DA US 3582128 A US3582128 A US 3582128A
Authority
US
United States
Prior art keywords
suspension member
tongs
lifting
gripping arms
pivot
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
US724816A
Other languages
English (en)
Inventor
Ghislain Antoine Jean Martelee
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.)
Cockerill SA
Cockerill Ougree Providence et Esperance Longdoz
Original Assignee
Cockerill SA
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
Application filed by Cockerill SA filed Critical Cockerill SA
Application granted granted Critical
Publication of US3582128A publication Critical patent/US3582128A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • B66C1/22—Rigid members, e.g. L-shaped members, with parts engaging the under surface of the loads; Crane hooks
    • B66C1/28—Duplicate, e.g. pivoted, members engaging the loads from two sides
    • B66C1/30—Duplicate, e.g. pivoted, members engaging the loads from two sides and also arranged to grip the sides of the loads

Definitions

  • Lifting tongs for handling heavy rigid loads such as coils of sheet metal comprise two gripping arms each provided with a lug for supporting said load and a suspension member with two pivots on which are articulated two pairs of arms crossed in scissors fashion articulated to said gripping arms so that the tongs may be pivoted in relation to said suspension member, by an angle of at least a few degrees, between certain limits determined by stops.
  • This invention relates to lifting tongs for handling heavy rigid loads such, for example, as coiled metal sheets.
  • lifting tongs For handling heavy rigid loads and, in particular, coils or bundles of metal sheets, it is known to utilize lifting tongs so arranged that the gripping arms remain parallel to one another as they are brought-together or drawn apart in order to seize the heavy rigid load in question. Further, the said lifting tongs are sometimes provided with a device permitting them to be pivoted round the axis defined by the intersection of the plane determined by the axes of the said gripping arms on the one hand and the plane extending perpendicularly to this plane midway between these two gripping arms on the other hand and which in what follows will be termed the center plane of the tongs.
  • these known lifting tongs are provided with a suspension member which frequently consists of a rigid metal rod.
  • this rod is replaced by a complex device comprising a part of the locking mechanism of the said gripping arms and of the mechanism for pivoting the tongsround the axis defined above.
  • the said suspension member is maintained in position relatively to the remaining part of the tongs, due to mechanism controlling the action of the tongs.
  • the axis of this suspension member coincides with the pivotal axis defined above.
  • lifting tongs for handling heavy rigid loads such as, for example, ls of sheet metal comprising two gripping arms each provided with a lug designed to support the said heavy rigid loads, the said tongs being provided with a suspension member adapted to be coupled to a lifting device, wherein the suspension member being pivoted, in relation to the remaining portion of the tongs, on an axis perpendicular to the plane determined by the axes of the said two gripping arms and maintained between certain limits of angular rotation by stops fixed to the remainder of the tongs, the said stops being such that they permit the said suspension member to move away, in relation to the center plane of the tongs, by an angle of at least a few degrees.
  • the tongs suspension member will pivot round the said perpendicular axis in such a way as to bring the tractive force being exerted on the tongs into coincidence with said axis. Consequently the said axis approaches the center of gravity of the tongs and this in direct proportion to the closeness of the said perpendicular axis to the said gripping arms of the tongs.
  • the lateral force mentioned above is therefore considerably less for the tongs in accordance with the invention than for conventional tongs.
  • the bending stresses on the suspension member are reduced, because this member is positioned in the line of the tractive force being exerted on the tongs.
  • FIG. 1 is a diagrammatic view in elevation of one embodiment of the tongs in accordance with the invention
  • FIG. 2 is a partly broken away diagrammatic view in perspective of part of a spring box forming a further embodiment of the tongs in accordance with the invention.
  • the tongs shown in FIG. 1 comprise two gripping arms 1 and 2 each provided with lugs 3 and 4 respectively, designed to support a heavy rigid load such as 5. These two gripping arms 1 and 2 extend upwardly to form two guides 6 and 7 pierced respectively by a slot 8 and a slot 9.
  • the two gripping arms 1 and 2 are articulated to the ends of two pairs of arms and links, that is to say the arm 10 and link 11, articulated round a pivot 12, and the arm 13 and link 14, articulated round a pivot 15, respectively.
  • the links 11 and 14 are each articulated at their remote ends to the gripping arms 1 and 2 respectively on pivots 16 and 17.
  • the other ends ofthese links 11 and 14 are articulated on a common pivot 18.
  • the arms 10 and 13 are mutually articulated at one of their ends on a pivot 19.
  • the other ends of the arms 10 and 13 are each provided with a lug, 20 and 21 for sliding engagement in slots 8 and 9 respectively.
  • To the arm 10 is attached a rod 22 on which there acts ajack 23 by means of which the gripping arms 1 and 2, articulated to the arms and links 10,11,13 and 14, are caused to move apart or closer.
  • a rod 24 forming part of the tongs suspension member and designed to engage a hook 25 of a lifting device.
  • This suspension rod 24 can pivot around the axis of the said pivot 19, perpendicularly to the plane defined by the axes of the gripping arms 1 and 2.
  • a box 26 provided with two laminated springs 27 and 28 fixed rigidly to the boy 26, and which are pretensioned, that is to say they already exert equal and opposite forces on the rod 24 when the said rod is vertical.
  • These springs 27 and 28 act in opposition on the rod 24 is such a way as to tend to bring the rod 24 towards the center plane of the tongs, when the said rod 24 has pivoted round the axis of the pivot 19.
  • the said springs 27 and 28 are under maximum compression against the walls of the box 26, they constitute stops fixed to the remainder of the tongs.
  • the suspension rod 24 is bifurcated about the pivot 18 to provide two parallel rods 29 and 30 which pass on either side of the pivot 18 and whose axes define a plane perpendicular to the plane defined by the axes of the gripping arms 1 and 2.
  • To the ends of the pivot 18 are fixed two identical boxes 31 and 32 through which pass the rods 29 and 30 respectively.
  • Each of these two boxes 31 and 32 are provided with two laminated springs, that is to say 33 and 34, and 35 and 36, respectively.
  • the springs 33 and 34 are fixed rigidly to the box 31 while the springs 35 and 36 are fixed rigidly to the box 32.
  • the springs 33,34 act in opposition on the rod 29 and the springs 35,36 act similarly on the rod 30, tending to bring the rods 24,29 and 30 simultaneously towards the center plane of the tongs, when the rod 24 has pivoted by an angle of at least a few degrees round the axis of the pivot 19.
  • the springs 33,34 and 35,36 are preloaded and press on the stop pieces such as 37 and 38. Thus wear on the rods 29 and 30 is minimized and the tongs are always returned to the vertical in spite of the friction of the pivot 18 in respect of the suspension rod.
  • Lifting tongs for handling a heavy rigid load such as a coii of sheet metal,- comprising two parallel movable gripping arms, a lug on each of said gripping arms for supporting said heavy rigid load, a suspension member for engaging a hook of a lifting device, a lower pivot on said suspension member, two arms connected between said lower pivot and said gripping arms, an upper pivot on said suspension member, two links connected between said arms and said upper pivot, a box carried on said upper pivot; biasing means in said box on both sides of said suspension member so that said gripping arms are pivotally movable on said lower pivot relative to said suspen sion member, said biasing means acting in opposition on said suspension member to normally maintain said suspension member in a neutral position between said biasing means, and stop means in said box on both sides of said suspension member for limiting said pivoting movement to an angle of approximately a few degrees.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manipulator (AREA)
US724816A 1967-05-31 1968-04-29 Lifting tongs for handling heavy products Expired - Lifetime US3582128A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE6041380 1967-05-31

Publications (1)

Publication Number Publication Date
US3582128A true US3582128A (en) 1971-06-01

Family

ID=3874294

Family Applications (1)

Application Number Title Priority Date Filing Date
US724816A Expired - Lifetime US3582128A (en) 1967-05-31 1968-04-29 Lifting tongs for handling heavy products

Country Status (5)

Country Link
US (1) US3582128A (en))
DE (1) DE1756470B1 (en))
FR (1) FR1583514A (en))
LU (1) LU55825A1 (en))
SE (1) SE343565B (en))

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4093298A (en) * 1977-01-17 1978-06-06 The Raymond Lee Organization, Inc. Compressor tongs
US4929012A (en) * 1988-05-12 1990-05-29 Rjs Corporation Creel loading apparatus
US5024477A (en) * 1988-05-12 1991-06-18 Rjs Corporation Creel loading apparatus
US5163727A (en) * 1988-05-12 1992-11-17 Rjs Corporation Creel loading apparatus
US5370268A (en) * 1992-08-07 1994-12-06 Adams; George R. Remotely operated drum punch
US20240010471A1 (en) * 2021-03-29 2024-01-11 Riken Kogyo Inc. Coupling device and coupling method for coupling subject member

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3139302A (en) * 1961-09-08 1964-06-30 Molins Machine Co Ltd Mechanical handling apparatus
GB953810A (en) * 1962-01-03 1964-04-02 Atkron Inc Improved self-centering article grippers
BE685783A (en)) * 1966-08-19 1967-02-01

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4093298A (en) * 1977-01-17 1978-06-06 The Raymond Lee Organization, Inc. Compressor tongs
US4929012A (en) * 1988-05-12 1990-05-29 Rjs Corporation Creel loading apparatus
US5024477A (en) * 1988-05-12 1991-06-18 Rjs Corporation Creel loading apparatus
US5163727A (en) * 1988-05-12 1992-11-17 Rjs Corporation Creel loading apparatus
US5370268A (en) * 1992-08-07 1994-12-06 Adams; George R. Remotely operated drum punch
US20240010471A1 (en) * 2021-03-29 2024-01-11 Riken Kogyo Inc. Coupling device and coupling method for coupling subject member
US12049386B2 (en) * 2021-03-29 2024-07-30 Riken Kogyo Inc. Coupling device and coupling method for coupling subject member

Also Published As

Publication number Publication date
LU55825A1 (en)) 1968-06-28
DE1756470B1 (de) 1972-12-07
SE343565B (en)) 1972-03-13
FR1583514A (en)) 1969-11-07

Similar Documents

Publication Publication Date Title
US1807360A (en) Paper roll handling mechanism
US3103282A (en) Article grab
US3044819A (en) Sheet-metal handling apparatus
US3582128A (en) Lifting tongs for handling heavy products
US3001812A (en) Tongs
US2539233A (en) Lift truck and attachment therefor
US3436116A (en) Tiltable lifting tongs
US3341243A (en) Material handling apparatus
US3155416A (en) Automatic leveling device for tongs
US3674302A (en) Ingot and mold handling tongs
US3455593A (en) Lifting tongs
GB747526A (en) A lifting device
US2646305A (en) Fulcrum grab
US2916164A (en) Sheet inverter
US3807783A (en) Cable-operated mechanical grapple
US3186752A (en) Lifter with substantially constant inward jaw pressure
US2985481A (en) Adjustable opening tongs
US1962700A (en) Grab
US3330590A (en) Adjustable stabilized crane tongs
US2812972A (en) Grapple
US3172694A (en) Grapple
US3863971A (en) Adjustable support for a material handling fork
JP2793355B2 (ja) 吊 具
SU388994A1 (ru) Захват-кантователь для грузов цилиндрической формы
US3698757A (en) Lifting tongs