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WO1992007199A1 - Crochet de levage de securite - Google Patents

Crochet de levage de securite Download PDF

Info

Publication number
WO1992007199A1
WO1992007199A1 PCT/SE1991/000687 SE9100687W WO9207199A1 WO 1992007199 A1 WO1992007199 A1 WO 1992007199A1 SE 9100687 W SE9100687 W SE 9100687W WO 9207199 A1 WO9207199 A1 WO 9207199A1
Authority
WO
WIPO (PCT)
Prior art keywords
hook
catch
locking
latching
lever
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.)
Ceased
Application number
PCT/SE1991/000687
Other languages
English (en)
Inventor
Rolf BERGSTRÖM
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.)
Gunnebo Lifting AB
Original Assignee
Gunnebo Lifting AB
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 Gunnebo Lifting AB filed Critical Gunnebo Lifting AB
Publication of WO1992007199A1 publication Critical patent/WO1992007199A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B45/00—Hooks; Eyes
    • F16B45/02—Hooks with pivoting or elastically bending closing member
    • F16B45/024—Hooks with pivoting or elastically bending closing member and having means biasing the closing member about the pivot
    • F16B45/026—Hooks with pivoting or elastically bending closing member and having means biasing the closing member about the pivot and including a coil type spring
    • 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
    • B66C1/34—Crane hooks
    • B66C1/36—Crane hooks with means, e.g. spring-biased detents, for preventing inadvertent disengagement of loads
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B45/00—Hooks; Eyes
    • F16B45/02—Hooks with pivoting or elastically bending closing member
    • F16B45/023—Hooks with pivoting or elastically bending closing member the closing member pivoting about an axis perpendicular to the plane of the hook

Definitions

  • the present invention relates to a safety-lifting hook of the kind which includes a hook element provided with an opening, a two-arm lever element which is connected pivotally to the hook element by means of a pivot shaft in a manner such that when the lifting hook is subjected to load, one arm of the lever element forms a barrier which automatically closes the opening of said hook element while the other arm forms a suspension element by means of which the hook can be coupled to a hook supporting device, such as rope, chain or the like, and further includes a locking element which is journalled on the hook element and which is biased towards a posi ⁇ tion in which it is in locking engagement with the lever element so as to lock the barrier arm in its hook- opening closing position.
  • Lifting hooks of this kind are known to the art and, because of their self-locking function when subjected to load and because of the locking mechanism which holds the barrier arm locked in its closed position irrespec ⁇ tive of whether the load is then relieved or not, afford a high degree of safety in the event of unintentional release of load-carrying lines or lifting chains from the hook, such unintentional release being liable to cause accident or injury to those in the vicinity.
  • this positive safety function however, there is a risk, although a very small risk, in certain extreme situations that the locking mechanism may be uninten ⁇ tionally released with subsequent opening of the barrier arm, so as to enable the load-carrying line to move out of engagement with the hook. This may occur, for in- stance, when the hook is temporarily relieved of load during a lifting operation and adopts an unfavourable
  • An object of the present invention is to eliminate such risk situations, or to render such situations almost impossible.
  • the present invention solves this problem by coordinating with the locking element a latching element which, in a first position, functions to prevent the locking element from leaving its position of locking engagement with the lever ele ⁇ ment, and in a second position functions to permit the locking element to move to a free position in which the barrier arm is able to expose the opening in the hook element when the lifting hook is relieved of load.
  • the barrier arm which in one posi- tion latches the locking element has, in turn, a latch ⁇ ing element which is so constructed as to necessitate first moving the latching element away from its first, latching position to its second, non-latching position before it is possible to bring the locking element to a position in which the barrier arm can be released.
  • the locking element in accordance with one suitable em ⁇ bodiment of the invention, has the form of a pin which can be moved axially generally parallel with the pivot shaft about which the catch pivots, so as to engage the hook element in said first position in a manner to prevent pivotal movement of the catch.
  • This requires the latching element to be moved generally perpendicular to the pivotal plane of the locking catch. This mini ⁇ mizes the risk of unintentional release of the locking catch.
  • the pin is preferably spring-biased towards its first, catch-locking position, in which it abuts an outer wall of the hook element. In its second, catch-release position, one end surface of the pin will suitable abut one side wall of the groove.
  • the latching element in accordance with another embodiment of the invention, has a part which, in the first posi ⁇ tion of said latching element, fills a space between the catch and a bottom wall of the groove, wherein at least this part of the latching element can be moved to the second position of said latching element generally parallel with the shaft about which the catch pivots.
  • the latching element is preferably supported on a pivot shaft on which the catch is pivotally mounted. This enables the latching element to be integrated with the locking element and to be con- structed as an additional part which can be readily fitted to an existing lifting hook which includes a locking catch which lacks a latching element.
  • the latching element may suitably have the form of a blade-like arm or may comprise a wire spring having a round-coiled outer end which substantially fills the space between the catch and the bottom wall of the groove, said catch having a recess which, when the latching element is in said second position, accommo ⁇ dates at least the space-filling part of the latching element when the catch is swung away from its position of locking engagement with the lever element, therewith enabling the barrier arm to be swung away from the opening in the hook element when the lifting hook is relieved of load.
  • Figure 1 is a side view of a first preferred embodiment of an inventive safety hook
  • Figure 2 illustrates an opening phase of the hook, in which the latching element is activated to release the locking mechanism from its position of locking action with the barrier arm
  • Figure 3 is a view taken on the line III-III in Figure l
  • Figure 4 is a side view of a second embodiment of an inventive lifting hook
  • Figure 4a illustrates the locking catch in a latched position, the view being taken according to the arrows A-A in Figure 4
  • Figure 4b is a view similar to Figure 4a, but shows the locking catch in a non-latching position
  • Figure 5 is a side view of a lifting hook in which the latching element has an alternative construction
  • Figures 5a and 5b are views of the Figure 5 embodiment corresponding to Figures 4a and 4b.
  • Figure 1 illustrates a lifting hook which comprises a hook part 10, whose upper end is pivotally connected to a two-arm lever element 12 by means of a pivot shaft 14.
  • the one lever arm of the lever element 12 forms, in a known manner, a clapper or barrier 16, which is intended to close the opening of the hook part 10 during load- lifting operations.
  • the outer end of the barrier arm is configured for complementary engagement with the outer end of the hook part 10, so as to be able to share the load placed on said hook part.
  • the other arm of the lever element 12 forms a suspension part 18 which is intended to be coupled to a lifting line, lifting chain or the like (not shown) that extends from a crane for instance.
  • the centre of the pivot shaft 14 is displaced to the right of the load symmetry line B of the hook, so that the barrier arm 16 will be brought automatically to its closing position when the hook is subjected to load.
  • the hook includes a locking mechanism which functions to hold the barrier arm 16 latched in its hook-closing position independently of the load on the hook, so as to prevent a load-carrying line suspended from the hook from being released unintentionally from said hook when the load thereon is relieved.
  • the locking mechanisms includes a locking catch 20 which is pivotally mounted on a pivot shaft 22 in a groove 24 provided in the upper part of the hook part 10.
  • the locking catch 20 includes a nib or tip 26 which is intended to engage a corresponding recess 28 in the lever element 12.
  • the catch 20 is biased towards its position of engagement with the lever element 12 by means of a torsion spring 30.
  • the nib 26 of the catch 20 engages the recess 28 in the lever element 12
  • the barrier arm 16 is latched in its hook-closing posi ⁇ tion.
  • the catch 20 also includes an operating part 32 which projects slightly from the upper side of the hook part 10. In order to release the catch 20 from its locking position, and therewith enable the barrier arm 16 to be swung to a hook-open position, it is necessary to apply pressure to the operating part 32 in the direction of the arrow C, so as to rotate the catch 20 anti-clockwise in Figure 1 against the action of the spring 30, until the nib 26 leaves the recess 28.
  • this additional safety device which when occupy ⁇ ing a first, normal position functions to prevent the locking catch 20 from rotating in a hook-releasing direction, and which when occupying a second position functions to permit the locking catch to move to a free position.
  • this additional safety device comprises a latching element which is arranged in the operating part 32 of the locking catch 20.
  • the latching element has the form of a latching pin 34 which can be moved axially, parallel with the pivot shaft 22, between a normal, outwardly projecting position in which one side surface of the latching pin 34 abuts the upper, outer side 35 of the hook part 10, or a recess provided in said hook part ( Figures 1 and 3) , so as to prevent pivotal movement of the catch 20, and a second position in which the latching pin 34 is located in the catch 20 so as to enable the catch to pivot in a manner to re- lease the barrier arm 16, as illustrated in Figure 2.
  • the latching pin 34 is biased towards its first, latch ⁇ ing position by means of a spring 36, as illustrated in Figure 3.
  • the pin 34 is thus depressed in the direction of the arrow D in Figure 3, and the lock ⁇ ing catch 20 is then pressed down by exerting a pressure on the operating part 32 in the direction of the arrow C in Figure 2.
  • the end surface of the pin 34 will then slide on the side wall of the hole 24, at the same time as the nib 26 of the locking catch 20 leaves the recess 28 in the lever element 12, so as to enable the lever element to be swung anti-clockwise, as shown in Figure 2, until the nib snaps into a recess 38 provided in the upper part 18 of the lever element, therewith holding the hook open.
  • the latching element of the locking catch 20 has the form of an extension 31 of the torsion spring 30.
  • the outer end 40 of the spring extension is thick ⁇ ened by means of a round-winding so that said outer end will generally fill the space defined between the under ⁇ side of the operating part 32 and the bottom wall of the groove 24. This prevents the catch 20 from being swung down to a release position, as shown in Figure 4a.
  • the outer end 40 of the spring can be moved manually in a direction parallel with the axis of the pivot pin 22, as shown by the arrow E in Figure 4a, to a central position in a recess 44. It is not until the catch 20 is located in this position that the catch 20 can be pressed downwards in the direction of the arrow C in Figures 4 and 4b, so as to free the barrier arm 16.
  • the aforedescribed spring latching means 30, 40 is preferably biased towards the position in which it latches the catch 20, shown in Figure 4a.
  • Figure 5 illustrates an alternative embodiment of the latching element which differs from the torsion spring 30 and has the form of a blade-like arm 46 which is journalled on the pivot pin 20 and has an enlarged outer end 48, similar to the spring latches 30, 40.
  • the arm 46 is also preferably biased towards the position in which it latches the catch 20, shown in Figure 5a, and can be moved to a catch release position, by applying a finger pressure in the direction indicated by the arrow E, as shown in Figure 5b.
  • the respective latching elements 30, 40 and 44 are constructed to enable them to be subsequently fitted to existing lifting hooks provided with a barrier-arm lock ⁇ ing mechanism without need to modify the hook part 10.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Hooks, Suction Cups, And Attachment By Adhesive Means (AREA)
  • Load-Engaging Elements For Cranes (AREA)

Abstract

La présente invention se rapporte à un crochet de levage pourvu d'un mécanisme de verrouillage qui fonctionne de manière à verrouiller un bras formant une barrière (16) en une position où le bras ferme l'ouverture du crochet. Selon cette invention, le crochet de sécurité comprend un élément de verrouillage additionnel (34) qui fonctionne de manière à bloquer le mécanisme de verrouillage (20) dans sa position de verrouillage.
PCT/SE1991/000687 1990-10-12 1991-10-11 Crochet de levage de securite Ceased WO1992007199A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9003268-1 1990-10-12
SE9003268A SE9003268D0 (sv) 1990-10-12 1990-10-12 Lyftkrok

Publications (1)

Publication Number Publication Date
WO1992007199A1 true WO1992007199A1 (fr) 1992-04-30

Family

ID=20380633

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1991/000687 Ceased WO1992007199A1 (fr) 1990-10-12 1991-10-11 Crochet de levage de securite

Country Status (2)

Country Link
SE (1) SE9003268D0 (fr)
WO (1) WO1992007199A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0577240A1 (fr) * 1992-07-01 1994-01-05 Maclaren Limited Mécanisme de verrouillage
GB2379478A (en) * 2001-04-20 2003-03-12 Steven Hong Coupling self-locking hook
DE102008033431A1 (de) * 2008-07-16 2010-01-28 Faszinatour Touristik - Training - Event Gmbh Anschlagelement für eine Sicherungseinrichtung
US8657068B2 (en) 2006-10-27 2014-02-25 Edelrid Gmbh & Co. Kg Securing device
TWI482732B (zh) * 2012-10-03 2015-05-01 Yoke Ind Corp Lock the hook

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1497504A (en) * 1975-02-10 1978-01-12 Columbus Mckinnon Corp Safety hook
EP0080955A1 (fr) * 1981-11-30 1983-06-08 FORGES DE LA BECQUE société anonyme Crochet de levage avec dispositif de sécurité
EP0085631A1 (fr) * 1982-02-02 1983-08-10 Blaise Henrion Perfectionnements apportés aux crochets à verrouillage

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1497504A (en) * 1975-02-10 1978-01-12 Columbus Mckinnon Corp Safety hook
EP0080955A1 (fr) * 1981-11-30 1983-06-08 FORGES DE LA BECQUE société anonyme Crochet de levage avec dispositif de sécurité
EP0085631A1 (fr) * 1982-02-02 1983-08-10 Blaise Henrion Perfectionnements apportés aux crochets à verrouillage

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0577240A1 (fr) * 1992-07-01 1994-01-05 Maclaren Limited Mécanisme de verrouillage
GB2379478A (en) * 2001-04-20 2003-03-12 Steven Hong Coupling self-locking hook
US8657068B2 (en) 2006-10-27 2014-02-25 Edelrid Gmbh & Co. Kg Securing device
DE102008033431A1 (de) * 2008-07-16 2010-01-28 Faszinatour Touristik - Training - Event Gmbh Anschlagelement für eine Sicherungseinrichtung
DE102008033431B4 (de) * 2008-07-16 2010-03-04 Faszinatour Touristik - Training - Event Gmbh Anschlagelement für eine Sicherungseinrichtung
US8281895B2 (en) 2008-07-16 2012-10-09 fazinatour Touristik-Training-Event GmbH Stop element for a securing device
TWI482732B (zh) * 2012-10-03 2015-05-01 Yoke Ind Corp Lock the hook

Also Published As

Publication number Publication date
SE9003268D0 (sv) 1990-10-12

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