EP0463838A1 - Hubgreifer - Google Patents

Hubgreifer Download PDF

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Publication number
EP0463838A1
EP0463838A1 EP91305682A EP91305682A EP0463838A1 EP 0463838 A1 EP0463838 A1 EP 0463838A1 EP 91305682 A EP91305682 A EP 91305682A EP 91305682 A EP91305682 A EP 91305682A EP 0463838 A1 EP0463838 A1 EP 0463838A1
Authority
EP
European Patent Office
Prior art keywords
plates
casing
shackle
pin
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.)
Withdrawn
Application number
EP91305682A
Other languages
English (en)
French (fr)
Inventor
William Davies
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.)
J C Renfroe and Sons Inc
Original Assignee
J C Renfroe and Sons Inc
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 J C Renfroe and Sons Inc filed Critical J C Renfroe and Sons Inc
Publication of EP0463838A1 publication Critical patent/EP0463838A1/de
Withdrawn legal-status Critical Current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

Definitions

  • This invention relates to lifting clamps. More particularly, it relates to clamps for lifting and turning material such as metal plates.
  • the prior art contains numerous types of clamps for lifting material such as metal plates. It is generally agreed that most difficulties arise when a clamp is turning a material (moving a shackle parallel to clamp side plates) or side lifting (lifting the shackle perpendicular to clamp side plates) a material from a horizontal to a vertical. The difficulties arise, because the known devices are not flexible enough to exert a sufficient and reliable gripping force when turning or side lifting a material while still quickly releasing the member after it has been moved.
  • U.S. Patent No. 4,647,098 to Hoyer teaches a shackle parallel to side plates of the clamp which rides considerably up and along the side plates of the clamp during side lifting before a sufficient force is exerted to grip material with the jaw. Also in Hoyer, this shackle can be leveraged about bracing points on the inside of the casing when turning a plate. With a leveraging action, however, it may be difficult to get a reliable tight grip on the material. This is especially true when the plate material is thick and very little leveraging or prying action is obtained. Since turning or lifting of large metal plates requires assurance of sufficient gripping, this structure may not always meet that objective.
  • the present invention includes a clamp for lifting material comprising a casing having a longer length than width and a slot, disposed along the length and across the width of the casing, for receiving material to be lifted, and means, operatively positioned within the casing, for releasably holding the material in the slot.
  • the clamp also includes means, extending within and outward from the casing, for forcing the material holding means against the material.
  • This forcing means includes means for engaging a clamp lifting element having surfaces disposed outside of the casing and adjacent end surfaces of the casing which pivot about one of the adjacent end surfaces of the casing when the surfaces of the engaging means move along the width of the casing and which slide along the adjacent end surfaces of the casing when the surfaces of the engaging means move along the length of the casing; and means, connected to said engaging means and primarily disposed within the casing, for moving the material holding means against the material when the engaging means surfaces are pivoting about or sliding along at least one of the end surfaces of the casing.
  • Figure 1 shows four-way fully flexing clamp 5 for perpendicular side lifting and for parallel turning of material such as steel plates. It includes casing 10 having generally an inverted U-shaped configuration when in normal vertical lifting orientation and defining slot 11 open at its lower end.
  • material holding assembly 60 Disposed within casing 10 is material holding assembly 60. Included in the assembly is stationary holder 64 and movable jaw 62. Jaw 62 is held by cam jaw pivot pin 70 for releasably engaging the material in slot 11.
  • Stationary holder 64 can have a relatively smooth material resting surface as shown or other surfaces such as a toothed surface like jaw 62. Also, the assembly 60 may have two movable jaws and still obtain the advantages described herein.
  • cam jaw pivot pin 70 extending through jaw 62 and apertures of internal bosses 12 of casing 10. These bosses 12 are on both sides of jaw 62. A pair of holding pins 130 extend through apertures in bosses 12 and pin 70 to strongly secure the jaw 62. Strongly securing jaw 62 and pin 70 is desirable, because jaw 62 and pin 70 will undergo considerable stresses while being required to work reliably to avoid dropping large heavy plates during lifting.
  • Extending within and outward from casing 10 is another assembly for forcing material holding assembly 60 against the material. Included in this assembly is an element 80 for engaging a clamp lifting mechanism such as an external hook on a crane.
  • This clamp engaging element 80 includes a surface 82 disposed outside of casing 10 and disposed adjacent an end surface 22 of the casing.
  • an optional lock 120 for locking jaw 62 against material in slot 11.
  • This lock includes a connection 121 to movable jaw 62, a resilient member 122 between connection 121 and connection 124 on arm 123.
  • engaged to arm 123 are loosely fitting handle elements 125 and 126.
  • Figures 2 and 3 show spaced plates 20 and 30 of casing 10 and rods 16, 17 and 18 for connecting the spaced plates. Shown in Figure 3 is a planar piece 19 for connecting spaced plates 20 and 30. Plates 20 and 30 and connecting elements 16, 17, 18 and 19 may be integral to each other.
  • clamp 5 has a longer length along casing 10 of Figure 1 than a width between plates 20 and 30 of figures 2 and 3. Also, it can be appreciated that slot 11 is disposed along the length and across the width of the casing. In addition, it is preferred that top surfaces 22 and 32 of plates 20 and 30 are opposite to the lower end surfaces having slot 11.
  • the preferred element 80 for engaging a clamp lifting mechanism is a shackle as shown in Figures 1-3. As more clearly seen in Figures 2 and 3, shackle 80 is disposed perpendlcular to plates 20 and 30 (i.e., perpendicular to the length of the casing). To facilitate engagement with a clamp lifting mechanism, shackle 80 includes a relatively large eye-ring 81.
  • surfaces 82 and 84 disposed outside of and adjacent top surfaces 22 and 32 of plates 20 and 30 define lower shoulders of shackle 80.
  • Lower surfaces of shoulders 82 and 84 are defined in the preferred embodiments as under surface portions of shackle 80 beginning along the curve between lowermost projection 86 of the shackle and extending along the underside of the shoulder through where there is a curve leading to the side of the shackle.
  • FIG. 3 Also shown in Figure 3 is a nut 65 for bolting stationary holder 64 to casing plate connecting element 19.
  • Figures 2 and 3 show the adjacent, second or top end surfaces 22 and 32 of the plates including grooves 23 and 33.
  • lower shoulders 82 and 84 of shackle 80 are advantageously disposed adjacent grooves 23 and 33. More preferably, lower shoulders 82 and 84 are disposed directly adjacent top surfaces 22 and 32 of the spaced plates so that when shackle 80 is moved perpendicular to or parallel to the plates, a lower shoulder of shackle 80 immediately contacts a top end surface of one of the spaced plates.
  • lower shoulders 82 and 84 move along the length or width of the casing, that they immediately contact adjacent end surfaces of the casing near the end of grooves 23 and 33.
  • One way to accomplish such immediate contact near the end of grooves 23 and 33 is to have lower shoulders 82 and 84 resting (i.e., no activation of jaw 62 against the material) in an area defined by grooves 23 and 33 and below the line of curvature of plate top surfaces 22 and 32. This latter structure also allows the shackle to sit lower in the casing to assure that jaw 62 is moved to its fully open position.
  • Figure 4 illustrates an exploded perspective view of primarily internal elements of the lifting clamp of Figure 1.
  • plate 30 of the casing having interior wall 34 with internal recess 36.
  • a central pin 50 is to be slidably disposed in recess 36. This pin 50 is prevented from lateral movement in the recess. Thus, central pin 50 moves only towards and away from top end surfaces 22 and 32 of the plates.
  • link 90 for transferring motion of shackle 80 in both a perpendicular and a parallel direction relative to the plates to effectively direct jaw 62 towards the material.
  • Link 90 is connected to shackle 80 and central pin 50 for transferring both the sliding and pivoting motions of shackle lower shoulders 82 and 84 against at least one of top surfaces 22 and 32 of the plates to a pull on central pin 50 towards top surfaces 22 and 32 of the plates.
  • link 90 includes lower portion 91 disposed about central pin 50 and upper portion 93 supporting lowermost projection 86 of the shackle.
  • clevis link wherein upper portion 93 of the link includes two projections 94 and 95 extending from lower portion 91 of the link and a shackle pin 100 extending through a lowermost aperture 89 of the shackle and through apertures 96 and 97 of projections 94 and 95.
  • pins 110 and 112 extend through apertures 98 and 99 in link projections 94 and 95 and through shackle pin 100.
  • lower portion 91 having aperture 92, at a right angle to apertures 96 and 97, through which central pin 50 extends.
  • Figure 4 also shows arms 40 and 42 connected about central pin 50 and rocking pin 74 of the material holding movable jaw 62. These arms are for directing jaw 62 towards the material when central pin 50 within recess 36 is moved towards adjacent top surfaces 22 and 32 oft the plates. These jaw directing arms 40 and 42 are preferably disposed about a rocking pin 74 from which an end of movable jaw 62 is pulled upward. O-rings 75 and 76 are disposed between pin 74 and arms 40 and 42.
  • FIGS 5 and 6 illustrate the operation for side lifting material such as a steel plate from a horizontal to a vertical position.
  • lifting shackle 80 has been moved perpendicular to side plates 20 and 30 of the casing.
  • a portion of lower shoulder 84 of shackle 80 pivots about adjacent top surface 32 of plate 30 to pull central pin 50, within oppositely facing internal recesses 26 and 36 of plate interior walls 24 and 34, toward top surfaces 22 and 32.
  • recess 26 for pin 50 is preferably disposed directly above slot 11 of the casing. With this structure, pin 50 is held in a centered position of casing 10.
  • Figure 7 illustrates the clamp in a fully closed position and Figure 8 illustrates the clamp closed about material 2.
  • Figures 7 and 8 also illustrate lower shoulder 82 of shackle 80 sliding along top surface 22 of plate 20 to pull central pin 50 toward top surface 22 of plate 20. It can be appreciated from Figures 1-8 that during the motions of the shackle shown in Figures 7 and 8, the opposite lower shoulder 84 is sliding along top surface 32 of plate 30 to pull central pin 50 toward top surface 32 of plate 20.
  • Adjacent top surfaces 22 and 32 of plates 20 and 30 have a first radius of curvature.
  • Lower shoulder 82 and 84 of the engaging shackle 80 have a second radius of curvature which is less than the first radius of curvature of the adjacent top surfaces of the plates.
  • Figures 7 and 8 also illustrate link 90, pin 50, arm 40 and locking pin 74, primarily disposed within the casing, for moving material holding jaw 62 against material 2 when the engaging shackle lower shoulder 82 and 84 are pivoting about or sliding along at least one of top surfaces 22 and 32 of the plates.
  • gripping jaw 62 can preferably only be moved to the full open position when the lifting shackle is in the centered position. Furthermore, except for when optional lock 120 is used, the movable jaw 62 does not hold the material until the engaging shackle lower shoulders are moved either along the length or width of the casing. When the shackle is moved, however, its shoulders 82 and 84, by being adjacent to plate top surfaces 22 and 32, facilitate rapid movement of the jaw towards the material. This speed is especially advantageous when a thin plate in the slot must be held by the jaw before too much lifting or turning of the clamp occurs.
  • both the pivoting effect on a lower shoulder of the shackle and the camming effect due to the combination of the two radii planes are in effect for even tighter gripping.
  • Figures 7 and 8 also show elements 121-126 in the locked position. By comparing Figures 7 and 8 to Figure 1, it can be seen that when handle elements 125 and 126 rotate arm 123 upwards, resilient member 122 and its connection 121 pull jaw 62 into its material engaging positions.
  • the working parts are preferably disposed inside the body of the casing.
  • cam jaw pin 70 disposed in the casing for pivotally supporting the cam jaw, does not extend beyond the outer wall of the casing.
  • the casing further includes an inwardly directed boss 12 of Figure 1 on one side of the holding jaw 62 and an opposing boss (not shown) on the other side of jaw 62.
  • Each of the bosses include an aperture for receiving cam jaw pivot pin 70 and apertures for receiving holding pins 130.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Load-Engaging Elements For Cranes (AREA)
EP91305682A 1990-06-22 1991-06-24 Hubgreifer Withdrawn EP0463838A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US54243990A 1990-06-22 1990-06-22
US542439 1995-10-12

Publications (1)

Publication Number Publication Date
EP0463838A1 true EP0463838A1 (de) 1992-01-02

Family

ID=24163844

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91305682A Withdrawn EP0463838A1 (de) 1990-06-22 1991-06-24 Hubgreifer

Country Status (1)

Country Link
EP (1) EP0463838A1 (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2453121B2 (de) * 1974-11-08 1980-02-28 Eagle Clamp Co., Ltd., Nara (Japan) Hebeklaue
US4647098A (en) * 1984-06-23 1987-03-03 Firma Pfeifer Seil-Und Hebetechnik Gmbh & Co. Hoist clamp
US4834442A (en) * 1988-03-03 1989-05-30 Choung Moon M Lifting clamp

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2453121B2 (de) * 1974-11-08 1980-02-28 Eagle Clamp Co., Ltd., Nara (Japan) Hebeklaue
US4647098A (en) * 1984-06-23 1987-03-03 Firma Pfeifer Seil-Und Hebetechnik Gmbh & Co. Hoist clamp
US4834442A (en) * 1988-03-03 1989-05-30 Choung Moon M Lifting clamp

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