EP1560782A1 - Dispositif de prehension pour soulever une dalle, un panneau, ou un materiau en feuille - Google Patents

Dispositif de prehension pour soulever une dalle, un panneau, ou un materiau en feuille

Info

Publication number
EP1560782A1
EP1560782A1 EP03729200A EP03729200A EP1560782A1 EP 1560782 A1 EP1560782 A1 EP 1560782A1 EP 03729200 A EP03729200 A EP 03729200A EP 03729200 A EP03729200 A EP 03729200A EP 1560782 A1 EP1560782 A1 EP 1560782A1
Authority
EP
European Patent Office
Prior art keywords
pulley
clamping
plate
cam
sliding plate
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Withdrawn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
EP03729200A
Other languages
German (de)
English (en)
Other versions
EP1560782A4 (fr
Inventor
Nhon Hoa Nguyen
Nhon Hau Nguyen
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.)
Abaco Machines Australasia Pty Ltd
Original Assignee
Abaco Machines Australasia Pty Ltd
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 Abaco Machines Australasia Pty Ltd filed Critical Abaco Machines Australasia Pty Ltd
Publication of EP1560782A1 publication Critical patent/EP1560782A1/fr
Publication of EP1560782A4 publication Critical patent/EP1560782A4/fr
Withdrawn legal-status Critical Current

Links

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
    • B66C1/442—Gripping members engaging only the external or internal surfaces of the articles and applying frictional forces actuated by lifting force
    • 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

  • the present invention relates to clamping devices that may find use in hoisting and handling heavy slab, panel or sheet materials such as stone, masonry, concrete, marble, metal and the like materials.
  • the invention relates to an improvement for lifting clamps of the type having a rigid frame having a fixed jaw plate that provides a first clamping surface, a movable jaw plate that provides a second clamping surface and which is supported at the frame for reciprocating movement towards and away from the fixed jaw plate, and an actuating mechanism to bias the movable jaw plate towards the fixed jaw plate whereby the respective clamping surfaces abut onto opposite faces of the sheet material and frictionally clamp same against displacement.
  • a lifting clamp of the type with which the present invention is concerned is known from US Patent 5,893,595 (Corbett).
  • the lifting device includes a rigid frame comprising vertical, parallel spaced apart side plates, the upper ends of which are rigidly secured together by four tubular cross-members.
  • the lower portion of one of the side plates is angled away in downward orientation from the other side plate, the latter providing a fixed clamping jaw of the device.
  • a vertically extending plate is mounted for horizontal sliding movement on the cross-members between the side plates and provides a movable jaw of the device.
  • An actuator carriage which is disposed for guided vertical up and down movement is located between the movable jaw and the lower, angled portion of the frame side plate, whereby a set of rollers of the carriage respectively engage the facing surfaces of the movable jaw plate and the angled portion of the frame side plate.
  • the carriage is connected to a strip member that extends beyond the upper end of the frame and has a lifting lug to which is attachable a lifting cable or chain.
  • the device In order to lift (or otherwise handle) sheet material, the device is placed over the upper edge of the sheet so that it is received between the fixed and movable jaw plates, the carriage is raised by lifting the strip member through pulling the lifting cable upwards, whereby the carriage travels on the angled frame side plate portion and displaces the movable jaw horizontally until it abuts on the facing surface of the sheet material. Upon increasing the upward pulling force, the sheet material is frictionally clamped sufficiently tightly for it to be lifted with the device. In essence, clamping of the sheet material between the plate jaws is achieved by wedging the carriage between the frame side plate and the movable jaw, and the clamping force is maintained for as long as there is upward force being on the lifting cable.
  • a lifting clamp of similar design to that of Corbett is disclosed in German patent publication DE 199 23 788 A1 (Scheibenbogen GmbH & Co KG), where, however, the mechanism employed to move the movable jaw into gripping engagement with the sheet material comprises a cam pulley instead of a wedging carriage.
  • the pulley is mounted on the movable jaw plate with its axis of rotation perpendicular to the plane of the movable jaw plate, four rollers serving to support the pulley in parallel relationship at the facing jaw surface.
  • Two cams are arranged on the opposite face of the pulley, concentrically with and symmetrical about the rotation axis. The cams extend equiradially over a sector of the of the pulley circumference.
  • the hight of the cams increase from near the pulley face to a maximum hight that is dictated by the maximum spacing between the fixed and movable jaws of the clamp in their fully spaced apart position.
  • the cams thus provide sloping guide and bearing surfaces for respective actuator rollers that are secured in fixed relationship on the frame plate of the device that faces the pulley.
  • An actuator cable that is secured to the pulley perimeter is used to rotate the pulley, the actuator cable advantageously terminating in a hoop on which a hoisting cable or chain may be attached.
  • One object of the present invention is to provide a lifting device of the aforementioned type in which the tendency of the clamp of swaying into an inclined position during lifting of sheet material is minimised.
  • a clamping device suitable for lifting and handling of sheet like-objects, having a rigid frame with a fixed jaw that provides a first clamping surface, a movable jaw that provides a second clamping surface that is substantially parallel to the first clamping surface, the movable jaw being supported at the frame for reciprocating, linear movement towards and away from the fixed jaw, and an operating mechanism arranged to bias the movable jaw towards the fixed jaw in response to an actuating force being exerted on a tensile force transmitting member of the operating mechanism, thereby to abut the respective clamping surfaces onto opposite faces of an object received between the jaws and frictionally clamping same against displacement, characterised in that the movable jaw comprises a sliding plate on which the second clamping surface is provided, the sliding plate being inclined at an angle of about 8 to 12 degrees with respect to the first and second clamping surfaces and being supported at the frame to maintain said angle during movement to and from the fixed jaw, and in that the tensile force transmitting member is guided and
  • the operating mechanism of the lifting clamp comprises a cam pulley system whose operating principle (but not necessarily its constructional layout) is similar to the one described in above mentioned German document, the contents of which is incorporated herein by way of cross- reference.
  • Such actuating system provides for a more uniform and even clamping load distribution as compared to the solution of Corbett.
  • the operating mechanism includes a drive pulley that Is mounted on the sliding plate of the movable jaw with its axis of rotation perpendicular to the plate plane, a plurality (preferably four or more) of bearing rollers arranged to support the pulley in parallel relationship at the facing sliding plate surface, at least one, preferably two actuating cams protruding from the pulley surface that faces away from the sliding plate, the actuating cams being symmetrically disposed about the rotation axis of the pulley and extending along an arc sector radially inwards of the pulley circumference, the cams having a hight that increases from near the pulley face to a maximum hight that is related to the maximum spacing between the fixed and movable jaws of the clamp in their fully spaced apart position, the cams each defining a sloped guide and bearing surface for respective actuator rollers that are secured in fixed relationship on a stationary part of the clamp frame that faces the pulley, the arrangement
  • the tensile force transmitting member used to rotate the pulley is preferably an actuator cable that is suitably secured to the pulley perimeter and partially wound on and running in a peripheral groove of the pulley.
  • the actuator cable may advantageously terminate at its other, free end in a hoop on which a hoisting cable or chain may be attached.
  • the clamp In operation of the clamp, when a pulling force is exerted on the actuator cable, eg when hoisting a slab, rotation of the pulley causes the actuator rollers to travel along the bearing surfaces of the cams.
  • the hight increase of the cams can be constant, progressive or decreasing, ie the contour of the bearing surfaces can be rectilinear, curved or otherwise shaped, thereby to achieve a desired displacement movement of the sliding plate away from the stationary frame part, eg a frame plate, towards the fixed jaw.
  • the sheet material received between the jaws is thus clamped with a force that is a function of the pulley diameter, the distance of the arc-shaped cams from the axis of rotation of the pulley, and the weight of the material being hoisted with the clamp.
  • the rigid frame may preferably be an assembly consisting of a side plate that provides the fixed jaw, a substantially rectangular parallelepiped shaped housing part with an open side disposed to face the side plate, whereby a bottom wall or side walls of the housing may provide the stationary frame part that supports and locates the actuating rollers that engage the cam pulley, and a plurality of (preferably four) cross struts rigidly joining the side plate and the housing part in spaced apart relation ship at upper ends thereof, the housing part having a cavity in which the cam pulley of the operating mechanism locates when the clamp is in a fully open state, eg non-clamping state, in which the movable sliding plate comes to rest adjacent the housing part and covers the open side face.
  • the partially encased operating mechanism is thus protected from damage to its moving parts.
  • the clamping device may incorporate a locking mechanism that is arranged to lock the cam pulley against rotation.
  • the locking mechanism may be designed to be engageable only when the movable jaw is in its non-clamping position, or in any position.
  • One embodiment of the locking mechanism includes a rotatable locking plate attached to or otherwise operably connected to a handle, knob or other manual actuating member, the locking plate being supported at the housing part in a location where it can be rotated or displaced in and out of engagement with a locking receptacle provided either on the cam pulley or a support shaft thereof.
  • Fig. 1a is a side view of a lifting clamp in accordance with a first embodiment of the invention, its gripping position with a sheet material suspended there from;
  • Fig. 1b is a front elevation of the clamp of fig. 1a;
  • Fig. 2 is a longitudinal section of the clamp along line A-A of fig. 1b;
  • Fig. 3 is a plan section of the clamp taken along line B-B of fig. 2;
  • Figs.4a to 4c are, respectively, a front elevation, a side view and a section along line D-D of a housing part of the clamp that provides a stationary clamp part and protective cover for the operating and clamping mechanism of the clamp device of fig. 1a;
  • Figs. 5a to 5 c are, respectively, a front elevation, a side section along line E-E and a side view of a sliding plate that forms part of a movable jaw member of the clamp device of fig 1 a;
  • Fig. 6 shows in cross-section a partial view of the cam pulley of the operating and clamping mechanism for actuating the movable jaw of the clamp device
  • Figs. 7a and 7b are an isometric top and bottom view of the cam pulley of the operating and clamping mechanism of the clamp device.
  • Fig. 8 is a plan section similar to fig. 3 of the clamp device incorporating a second embodiment of a cam pulley locking device in accordance with an aspect of the present invention.
  • Fig 1 a illustrates a clamping device 10 in accordance with the present invention as used for lifting and hoisting sheet-like materials 15 of substantial dimensions and weight.
  • sheet materials is here generically also used herein to describe slabs of stone, marble, sheet or sheets of metal tightly bundled into a stack, or the like.
  • the lifting clamp 10 illustrated in greater detail in figs 1b to 3 comprises substantially three subassemblies or groups, a fixed, stationary jaw section 20, a movable jaw section 22 and a stationary housing section 24, wherein an actuating mechanism 90 employed to move the movable jaw section 22 with respect to the fixed jaw section and housing section 24 is located between the housing and movable jaw sections.
  • Jaw section 20 and housing section 24 define a rigid clamp frame and are joined together at an upper end in spaced apart relationship by means of 4 cross bars 26 and 28, the terminal ends of which are fixedly secured to the respective sections 20 and 24 by appropriate screws 30, 32, see below.
  • the upper pair of cross bars 28 also serve to suspend in guided manner the movable jaw section 22 so that it may be caused to slide there along upon actuation of the operating and clamping mechanism described below toward and away from the stationary jaw section 20 of the device.
  • Stationary jaw section 20 is comprised of a substantially rectangular steel plate member 34, having four bores disposed on an upper section to receive and secure the screws for fixing the cross bars 26, 28 to it.
  • a rubber glove 36 is fitted to the lower portion of steel plate member 34. As shown in Fig.
  • the rubber glove 36 has a trapezoidal cross-section with a lower portion that is angled slightly inwardly to allow for easy manoeuvring of the jaw 20 onto the work piece or slab and into gripping position for lifting.
  • Glove 36 provides a high friction material between the stationary jaw and the slab being lifted to prevent the slab from slipping or being damaged during lifting operation.
  • housing section 24 includes a substantially rectangular parallelepiped shaped housing box 38, that has a solid material upper portion 40 that is angled in side view about 9 to 12, preferably 11 degrees with respect to a lower housing portion 42.
  • Upper portion has formed therein four bores of stepped diameter that serve to form-fittingly receive the terminal ends of cross rods 26 and 28 and secure same against displacement therein using screws 30, 32 (fig. 2).
  • Lower portion 42 includes an open cavity 44 bordered by opposing side walls 50, a bottom wall 51, a base wall 48 and said upper solid material portion 40.
  • actuating rollers 86 are supported on respective shafts that extend substantially parallel to base wall 42, the shafts being secured in known manner to the pedestals.
  • Cavity 44 in lower housing portion 42 is dimensioned such as to cover and receive therein a cam pulley 94 of the operating mechanism 90 described below.
  • a protective rubber shoe 54 covers the lower terminal end of housing box 38.
  • housing section 24 also carries the components of a locking or arresting mechanism 65 employed to lock the movable jaw section 22 of the clamp against axial displacement along cross rods 28, whilst an additional arresting mechanism 60, described in greater detail below, serves to lock the actuating mechanism 90.
  • the movable jaw section 22 comprises a sliding plate (assembly) 70 that includes a generally rectangular base plate 72 to which are welded at the upper width-wise edges thereof two side plates 73, 74 that extend perpendicular to base plate 72. Parallel to the latter and received between side plates 73, 74 is welded a smaller face plate 75.
  • Guide tubes 76 that extend parallel to one another are received in openings in the face and base plates 72, 75 and welded to the plates. Ring seals 78 and a guide bush 79 are secured within the guide tubes as illustrated in fig. 5b.
  • Guide tubes 76 serve the purpose of guiding and suspending the sliding plate assembly 70 in a defined orientation at the upper pair of cross rods 28 that extend between fixed jaw section 20 and housing section 24, that is with the plate assembly 70 maintaining an inclined attitude with respect to a vertical line as shown in figs 1a and 2 whilst it displaces along the horizontally orientated cross rods (bars) 28.
  • This angle is preferably set to about 11 degrees.
  • the tubes 78 are welded to the base plate 72 with their longitudinal axis inclined about 11 degrees with respect to a line that extends orthogonally with respect to the plate's plane.
  • an additional pair of openings 76a and 76b is respectively provided in face and base plates 72 and 75 below the guide tubes 76 thereby to allow the lower pair of cross rods 26 to pass extend through the sliding plate assembly 70 with play, as seen in fig. 2.
  • a clamping plate 77 which in longitudinal section is about triangular, is mounted in fixed manner to the lower portion of base plate 72 of sliding plate assembly 70.
  • the clamp plate 77 is rubber coated and defines the clamping surface of the movable jaw section 22, wherein the inclination angle at the pointed upper end of clamping plate is about 11 degrees, such that the inclination angle maintained between guide tubes 76 and base plate 72 is off-set and the clamping surface 77a of clamp plate 77 is held about parallel to the clamping surface 36a provided at the fixed jaw plate 34; this parallel relation ship being maintained as the sliding plate assembly 70 moves along cross rods 28 of the clamp device 10.
  • a set of tension springs 80, 82 is located between the movable jaw section 22 and the housing section 24 such as to bias the sliding plate assembly 70 towards the housing box portion 42 and cover cavity 44.
  • This position represents the fully open clamp jaws position, and depending on the spring constants of the tension springs employed, see below, an additional locking member may be required to secure the open position.
  • four tension springs are used, located and secured in appropriate and known manner at the respective retention elements 84 at the corners of sliding base plate 72 (see fig. 5a) and receptacle bores 83 in the housing part / section 38 (see fig. 4). It is noted that the number of springs, the type of springs and the spring constants of the springs used to pull the movable jaw into the open position varies depending on several design parameters set for the lifting devices such as its size and weight, etc.
  • the sliding plate assembly 70 also carries at its lower portion a mounting axle 92 for a cam pulley 94 of the operating mechanism 90 of the clamp device, as will now be described with reference to figs. 2, 3, 6 and 7 in particular.
  • Mounting axle (or shaft) 92 is welded onto the side of base plate 72 that faces away from the fixed jaw section 20, and supports in axially fixed manner a cam pulley 94 for rotation.
  • Cam pulley 94 has a disc portion 97 with a peripheral groove 91 , a lower circular face that is held with small clearance parallel to the facing surface of base plate 72 and a protruding hub portion 95 on the opposite face housing a pair of thrust bearings 96 that serve to support pulley 94 at shaft 92 and react forces in axial direction of the shaft.
  • a set of four, additional bearing wheels or rollers 98 are provided to maintain the clearance gap, reduce frictional load on the shaft bearings 96 and more evenly distribute loads past the pulley 94 onto the adjoining sliding plate assembly 70.
  • Each roller 98 is received in a respective one of four housing openings 99 that extend through the disc portion 97 and which are located equidistantly spaced apart and with equal radius about the axis of rotation represented by the pulley shaft 92.
  • Rollers 98 are supported at the disc portion 97 via respective axles 101 that are press-fitted or treaded into respective radially extending sack bores 102 whose axis extend radially away from and perpendicular to the pulley's axis of rotation, such that the outer surfaces of the rollers are in rolling contact with the facing surface of base plate 72 of the sliding plate assembly 70.
  • Cam pulley 90 includes, on the face spotting the hub portion 95, two identical cam members 105 symmetrically located about the axis of rotation of the pulley.
  • cam members 105 In plan view (as per fig. 3) cam members 105 have a curved or arcuate shape and are equiradially and concentrically spaced from the rotation axis of the pulley.
  • Each of the two curved cam members 105 extends along an arc of at least 90 degrees and defines a sloped guiding surface 106 (see fig. 7a) on its free terminal ridge.
  • each guiding cam surface 106 increases in height from its lowest point at 107a, where it is at the level with the top surface of pulley disc portion 97, to a highest point at 107 b, where it is farthest from the surface of the pulley disc, a planar end portion 107c of constant hight adjoining the highest point.
  • the slope direction of the guide surface 106, ie in clockwise or anticlockwise direction, at the cams will be dictated by the rotational direction in which the pulley disc is rotated by an operating cable 110 received in the pulley's groove 91 in order to displace the movable jaw section 22, ie whether the actuating cable unwinds clock or anticlockwise.
  • cable 110 is wound to cause anti-clockwise rotation of pulley 94 upon cable 110 being pulled upwards.
  • the upper portion of the base plate 72 of sliding plate assembly 70 carries a pair of guide rollers 87 in between which actuating cable 110 is guided at the upper end of the assembly 70 so that the cable extends therefrom in a line that coincides with the axis of rotation of cam pulley 94 and avoids an unsymmetrical loading of the clamp assembly 10 when hoisted (suspended).
  • a deflection roller 88 is located below guide rollers 87, the centre of rotation of deflection roller 88 is vertically aligned with the right upper roller 87 because, in this embodiment, the cam rotates counterclockwise when force is exerted upwardly on cable 110 in order displace the movable jaw into its clamping position.
  • the upper portion of cable 110 is formed into a loop such that the clamp device 10 can be hooked and lifted by a lifting crane or the like (not shown) during lifting operation.
  • the other (lower) terminal end of actuating cable 110 is removably secured to the perimeter of cam pulley 74 at a recess using known fastening techniques.
  • the operating mechanism 90 includes the actuating rollers
  • rollers 86 that are mounted in fixed locations in cavity 44 of stationary housing part 38.
  • the location of these rollers 86 is such that these bear on and can travel along the bearing and guiding surface 106 of the respectively associated one of the cams 105, wherein the arrangement is such that rotation of the pulley 74 causes axial displacement of the sliding plate assembly 70 (with the attached cam pulley 74) along the upper guide cross bars 28 of the clamp frame and coaxial with the axis of rotation of the pulley.
  • the length and the sloping angel of the cam surface maybe chosen as desired, depending on the space or gap between the gripping surfaces 36a and 77a of the fixed jaw and the movable jaw, and thus the distance the movable jaw travels from its open position toward the fixed jaw in order to clamp the thinnest slab the device is designed to grip. It should be noted also that in its closed position for gripping the thinnest slab the device is designed to lift, the actuating rollers 86 must not contact the cam surfaces at their highest point 107b.
  • a locking mechanism 60 is provided which when activated prevents the cam pulley 74 from being rotated and consequently keeps the jaw members 20, 22 in a fixed relation to one another.
  • the locking mechanism 60 includes a locking bar 64 that is excentrically fixed to the terminal end of the shaft of a knob 62 that extends through and is secured in axially fixed but rotation permitting manner at the bottom wall 48 of housing part 38.
  • Locking bar 64 is disposed to co-operate with a notched slot or groove 63 provided at the terminal free end of cam pulley support shaft 92.
  • the shaft 92 must hereby be long enough to allow locking bar 64 to engage slot or groove 63 of the support shaft when the movable jaw section 22 is in the fully open position.
  • the manual actuating member 161 includes a spring-loaded actuator rod 162 attached outside to the housing part 38.
  • a latching plate 164 is fixed within the housing part cavity 44 for rotation about an axis parallel to the rotation axis of the cam pulley 74.
  • An actuator arm 163 is secured rigidly to latching plate 164 and extends through an opening in the housing part 38 into engagement with the terminal end of actuator rod 162.
  • the cam pulley 74 has a cut-out 166 formed in its periphery into which the latching plate may be rotated into form-locking engagement to prevent rotation of the pulley 74.
  • the entire device 10 may be hoisted through actuating cable 110 being secured to a hoisting cable.
  • actuating cable 110 Normally, a lifting force exerted on cable 110 will cause cam pulley 74 to rotate and force the movable sliding plate assembly 70 which carries clamping plate 77 at its lower end to move toward the fixed jaw section 20 and thus close the clamp's jaws.
  • the movable jaw assembly 22 plate will or will not move when "normal" lifting force is initially exerted on cable 110: If springs 80, 82 are relatively weak, then the cam pulley 74 of operating mechanism 90 will rotate and drive the movable jaw toward the fixed jaw.
  • the gravity force exerted by device 10 on the cable 110 by itself will not be sufficient to overcome the bias force of the springs when the device 10 is lifted.
  • the pulley-cam mechanism 90 will not move and the movable jaw 22 will remain open and stationary until an actuating force is exerted that is greater than the weight of the device as a whole.
  • This additional force element can be exerted by an operator pulling the clamping frame downwards over the slab to be lifted
  • the locking bar or plate When operating the clamp device with activated locking mechanism 60, regardless of spring type employed, the locking bar or plate must be disengaged from engagement with the cam pulley in order to allow rotation thereof and close the movable clamping jaw 22.
  • the lifting clamp device 10 When the lifting clamp device 10 is located directly above the slab material to be lifted, a human operator will pull the device down toward the slab material whilst the hoop of actuating cable 110 is kept stationary. A downward directed pulling force exerted by an operator will causes the cam pulley to rotate, resulting in the movable jaw being displaced and moved into gripping position. The entire clamp device 10 is hereby lowered as the actuating cable 110 is unwound from the pulley.
  • the movable jaw 22 contacts the sheet and, together with the fixed jaw 20, grips the slab for lifting and transporting.
  • the lifting force is released form the cable 110 allowing the cam pulley 74, which advantageously is provided with a helical winding spring to induce rotation of the pulley in a direction counter the cable unwinding direction, to turn and partially wind cable 110 around pulley 74, thereby allowing the movable jaw 22 to return to the open/rest position under the influence of the biasing springs 80, 82.
  • the lifting operation is repeated in the same manner.
  • the lifting force exerted upwardly on the upper portion of the cable 110 and the centre of gravity of the slab and the lifting device are substantially aligned vertically by inclining the movable jaw member at an angle with respect to the vertical. It has been found that an angle between 9 degrees to 11 degrees with respect to the vertical gives the best results in term of enhancing the stability of the device during lifting operation.
  • the even distribution of the gripping force provided by the cam mechanism and the substantial alignment of the lifting force and the gravity force of the device and slab material being lifted of the improved lifting device result in the device being able to lift large and heavy slab material with less incident of breakage and/or deforming of the slab material, depending on whether the material is stone, marble or metal.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Load-Engaging Elements For Cranes (AREA)

Abstract

La présente invention concerne un dispositif de préhension (10) conçu pour soulever et manipuler des objets de type feuille (15). Ledit dispositif présente un bâti rigide possédant une mâchoire fixe (20) qui constitue une première surface de préhension, une mâchoire mobile (22) qui constitue une seconde surface de préhension qui est sensiblement parallèle à la première surface de préhension, la mâchoire mobile étant supportée sur le bâti pour alterner des mouvements linéaires de rapprochement et d'éloignement par rapport à la mâchoire fixe, et un mécanisme (90) conçu pour solliciter la mâchoire mobile en direction de la mâchoire fixe en réponse à une force d'actionnement exercée sur un élément de transmission de force de traction (110) du mécanisme, de manière à ainsi abouter les surfaces de préhension respectives sur les faces opposées d'un objet logé entre les mâchoires et prendre par frottement ledit objet de manière à empêcher tout déplacement. Ledit dispositif est caractérisé en ce que la mâchoire mobile comprend une plaque de préhension (72) sur laquelle est présente la seconde surface de préhension, la plaque de préhension étant inclinée selon un angle d'environ 8 à 12 degrés par rapport aux première et seconde surfaces de préhension et étant supportée au niveau du bâti pour conserver ledit angle lors du mouvement d'éloignement et de rapprochement par rapport à la mâchoire fixe. Ledit dispositif est également caractérisé en ce que l'élément de transmission de force de traction est guidé et supporté au niveau d'un emplacement supérieur de la plaque de préhension qui, sensiblement, s'aligne ou est en porte-à-faux avec la seconde surface de préhension.
EP03729200A 2002-01-14 2003-01-14 Dispositif de prehension pour soulever une dalle, un panneau, ou un materiau en feuille Withdrawn EP1560782A4 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
VN402 2002-01-14
VN200200402 2002-01-14
PCT/AU2003/000032 WO2003057613A1 (fr) 2002-01-14 2003-01-14 Dispositif de prehension pour soulever une dalle, un panneau, ou un materiau en feuille

Publications (2)

Publication Number Publication Date
EP1560782A1 true EP1560782A1 (fr) 2005-08-10
EP1560782A4 EP1560782A4 (fr) 2008-04-30

Family

ID=34063707

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03729200A Withdrawn EP1560782A4 (fr) 2002-01-14 2003-01-14 Dispositif de prehension pour soulever une dalle, un panneau, ou un materiau en feuille

Country Status (3)

Country Link
EP (1) EP1560782A4 (fr)
AU (1) AU2003201203A1 (fr)
WO (1) WO2003057613A1 (fr)

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CN108455448A (zh) * 2017-02-21 2018-08-28 霍.N.阮 用于提升和转移物体的夹紧装置

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Publication number Priority date Publication date Assignee Title
US7156436B2 (en) * 2005-03-07 2007-01-02 Abaco Machines (Australasia) Pty Ltd Clamping device having an actuating carriage which moves a movable jaw toward a stationary jaw
CN108481720B (zh) * 2018-04-24 2023-09-01 安徽鲲鹏装备模具制造有限公司 一种用于汽车内饰件片材成型的四面自动拉伸装置
CN110803620B (zh) * 2019-12-06 2023-08-22 大连华锐重工起重机有限公司 自动开闭式阳极焙烧夹具

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Publication number Priority date Publication date Assignee Title
JP3325701B2 (ja) * 1994-04-05 2002-09-17 株式会社スーパーツール 吊下装置
AUPN186295A0 (en) * 1995-03-21 1995-04-13 Herdgraph Pty Ltd Lifting device
JP2000062930A (ja) * 1998-08-24 2000-02-29 Tateyama Gokin Kogyo Kk 形材のクランプ装置
DE19923788C2 (de) * 1999-05-25 2001-06-21 Scheibenbogen Gmbh & Co Kg Plattenhebevorrichtung
US7156436B2 (en) * 2005-03-07 2007-01-02 Abaco Machines (Australasia) Pty Ltd Clamping device having an actuating carriage which moves a movable jaw toward a stationary jaw
CA2500249A1 (fr) * 2005-03-10 2006-09-10 Abaco Machines ( Australasia) Pty Ltd Dispositif de serrage permettant de soulever des plaques, panneaux ou feuilles

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108455448A (zh) * 2017-02-21 2018-08-28 霍.N.阮 用于提升和转移物体的夹紧装置
CN108455448B (zh) * 2017-02-21 2021-01-05 N·H·阮 用于提升和转移物体的夹紧装置

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EP1560782A4 (fr) 2008-04-30
WO2003057613A1 (fr) 2003-07-17

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