EP3696132A1 - Crochet port-charge de sécurité - Google Patents

Crochet port-charge de sécurité Download PDF

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Publication number
EP3696132A1
EP3696132A1 EP20151672.1A EP20151672A EP3696132A1 EP 3696132 A1 EP3696132 A1 EP 3696132A1 EP 20151672 A EP20151672 A EP 20151672A EP 3696132 A1 EP3696132 A1 EP 3696132A1
Authority
EP
European Patent Office
Prior art keywords
hook
load
mouth
opening
marking
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.)
Granted
Application number
EP20151672.1A
Other languages
German (de)
English (en)
Other versions
EP3696132B1 (fr
Inventor
Bernhard Oswald
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.)
Pewag Austria GmbH
Original Assignee
Pewag Austria GmbH
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 Pewag Austria GmbH filed Critical Pewag Austria GmbH
Publication of EP3696132A1 publication Critical patent/EP3696132A1/fr
Application granted granted Critical
Publication of EP3696132B1 publication Critical patent/EP3696132B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B66C1/22—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
    • 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
    • B66C1/40—Crane hooks formed or fitted with load measuring or indicating devices

Definitions

  • the invention relates to a safety load hook, comprising a lower part which forms a curved hook mouth with a hook opening of a predetermined nominal width and on which an upper part that can be pivoted into an open position, in which the hook opening is open for inserting or removing a load, and into a closed position is attached, which in this covers the hook opening to the outside so that the introduction of a load to be picked up in the hook mouth or the removal of a load contained therein is prevented.
  • a common checking method is to first determine the nominal width of the hook opening according to the manufacturer's specifications or with the aid of a product catalog and then to measure the actually existing hook opening with a suitable measuring device. The widening of the hook mouth that has already occurred can be determined from the resulting difference, after which it can be decided whether the safety load hook has already reached the deformation limit and is to be eliminated. In addition to the measurement to be carried out, a corresponding computational effort has to be carried out in order to be able to make the final decision.
  • Safety load hooks have also become known in the market in which forged wear marks are attached to the lower part of the hook in the area of the hook mouth, to the left and right of this. An additional text is attached there that defines a maximum distance between these two markings. When the hook mouth widens and reaches the specified maximum distance for the maximum permitted mouth opening the safety load hook must be eliminated. Here too, however, it is necessary to measure the distance by means of a suitable measuring device in order to be able to determine when the hook is ready for discard.
  • the invention aims to provide an improvement in the design of the hook in order to save both the measurement of a distance and thus time for the ongoing tests and to be able to carry out a purely visual inspection.
  • a safety load hook of the type mentioned in that a marking is provided on each of the end regions of the upper part and lower part facing each other when the upper part is closed, with the marking on the lower part being changed from the marking on the upper part in the closed position of the upper part a distance is offset in the direction of the hook opening, which is chosen so that both markings are aligned directly next to one another when a predetermined maximum widening of the hook mouth occurs compared to its predetermined nominal width in the closed state of the upper part.
  • the wear indicators in the form of corresponding markings attached to the safety load hook according to the invention both on the upper part of the hook and on the lower part are in the new condition of the safety load hook, i.e. when the hook opening still has the specified nominal width, so that when the upper part of the hook is closed, they are not in a line, but are offset from each other at a distance. If, however, the hook mouth widens in the course of use as a result of deformation, for example due to overloading, the distance by which the two markings are offset from one another is smaller when the upper part is closed, and when a predetermined size of the widening is reached, the two markings are aligned directly next to each other.
  • the tester can immediately visually recognize that the hook in question has reached the permissible deformation limit and must be eliminated if the two markings are directly next to each other when the permissible deformation limit is reached, i.e. when a predetermined size of the widening of the hook mouth occurs and there is no longer any distance between them, seen in the plane of the hook opening.
  • the examiner neither needs to use a suitable measuring device to determine the size of the opening of the hook mouth, nor is any computational effort required.
  • this visual inspection can also be carried out optically extremely quickly and requires almost no expenditure of time.
  • the wear marks on the upper part and the lower part can be provided or attached in any suitable form, but it is particularly advantageous to forge them on the upper part and the lower part during manufacture.
  • a particularly preferred design of the wear markings is that they are each designed in the form of a line and, if they are directly next to one another, run in a common line which optically shows that the permissible deformation limit has been reached very quickly.
  • the distance between the markings is chosen so that they are next to each other in the closed position of the upper part when the hook mouth is widened by 10% compared to its specified nominal width, because this is usually the case when widened by this size During the ongoing review, it is necessary to determine whether the relevant safety load hook is ready for discard.
  • a side view of a safety load hook 1 according to the invention is shown, which comprises a fixed lower part 2 and an upper part 5 which is attached to the lower part 2 so as to be pivotable about a swivel joint 10.
  • the upper part 5 is provided with a suitable connection (above), for. B. with a dome connection (as in Fig. 1 shown) or with an eyelet or a swivel (not shown in the figures).
  • the upper part 5 around the swivel joint 10 can be both in a closed position ( Fig. 1 ) are pivoted, as well as into an open position (not shown) in which the upper part 5 is opened upwards relative to the lower part 2 about the swivel joint 10.
  • the lower part 2 forms a hook mouth 3 which defines a hook opening 4 at the top, which when new has a predetermined nominal width n .
  • Fig. 1 how out Fig. 1 can be seen, in the closed state of the upper part 5, the hook opening 4 is covered to the outside, while in the open state of the upper part 5, when this is folded up from the lower part 2, from the outside through the hook opening 4 a (not shown) load into the Hook mouth 3 can be brought in or removed from this again to the outside.
  • FIGS. 1 to 3 show a state in which the hook opening 4 has the specified nominal width n assigned to the relevant safety load hook 1, that is to say a state which corresponds to the new state of such a safety load hook 1.
  • the end regions 6 and 7 of the upper part 5 and lower part 2 are aligned with their mutually facing ends, as shown in the illustrations in FIG Figures 1 , 2 and 3 show in detail, with express reference being made to the graphic representation in these figures.
  • the loads held in the hook mouth 3 cause a continuous deformation of the hook mouth 3, in particular in the case of overloads, such that it expands. If a permissible size of the widening of the hook mouth and thus a corresponding deformation limit is reached, the safety load hook may no longer be used and must be eliminated.
  • the permissible widening of the hook mouth 3 is specified for such safety load hooks 1 in detail by appropriate regulations or standards. B. in accordance with EN 818-6 and ⁇ NORM M9611 corresponds to a widening of the hook mouth 3 by 10% compared to its specified nominal width n .
  • the wear marks 8 and 9 are in the Figures 1 to 3 shown initial state of the safety hook 1 in its closed position, so according to its new condition, attached so that the offset of the wear mark 9 on the lower part 2 relative to the wear mark 8 on the upper part 5 is chosen so that the distance between the two a is just as large that the two Wear marks 8 and 9 when the maximum permissible widening of the hook mouth 3 is reached lie directly next to each other (or perhaps better said: one above the other), as shown in FIG Fig. 4 is shown.
  • the markings 8 and 9 are each, as the figures show, formed in a straight line shape and provided on the respective upper part 5 or lower part 2 carrying them that they when the predetermined maximum allowable expansion of the hook mouth 4 is reached, as they Fig. 4 shows run in mutual alignment along a common line b .
  • the wear markings 8 and 9 can be provided in any suitable form on the upper part 5 or lower part 2, whereby it is particularly advantageous if the respective mark 8 or 9 on the upper part 5 or lower part 2 is forged during its manufacture .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Hooks, Suction Cups, And Attachment By Adhesive Means (AREA)
  • Emergency Lowering Means (AREA)
EP20151672.1A 2019-02-12 2020-01-14 Crochet port-charge de sécurité Active EP3696132B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE202019100795.8U DE202019100795U1 (de) 2019-02-12 2019-02-12 Sicherheitslasthaken

Publications (2)

Publication Number Publication Date
EP3696132A1 true EP3696132A1 (fr) 2020-08-19
EP3696132B1 EP3696132B1 (fr) 2021-08-25

Family

ID=65728007

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20151672.1A Active EP3696132B1 (fr) 2019-02-12 2020-01-14 Crochet port-charge de sécurité

Country Status (4)

Country Link
US (1) US11161719B2 (fr)
EP (1) EP3696132B1 (fr)
DE (1) DE202019100795U1 (fr)
TW (1) TWI825273B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110759225A (zh) * 2019-11-14 2020-02-07 杨鑫 一种可实时监测预防断裂的起重机吊钩

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2604615A1 (de) * 1975-02-10 1976-08-19 Columbus Mckinnon Corp Sicherheits-lasthaken
FR2409956A1 (fr) * 1977-11-25 1979-06-22 Roiron Jacques Crochet de securite pour engin de levage
WO2016079488A1 (fr) * 2014-11-17 2016-05-26 Tiger Lifting Uk Limited Procédé et appareil pour détecter une distorsion de surcharge

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5193480A (en) * 1991-01-22 1993-03-16 The Crosby Group, Inc. Hoisting line fittings with working load limit indicia
US5452679A (en) * 1994-01-26 1995-09-26 Columbus Mckinnon Corporation Hoisting device with stressing indicia

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2604615A1 (de) * 1975-02-10 1976-08-19 Columbus Mckinnon Corp Sicherheits-lasthaken
FR2409956A1 (fr) * 1977-11-25 1979-06-22 Roiron Jacques Crochet de securite pour engin de levage
WO2016079488A1 (fr) * 2014-11-17 2016-05-26 Tiger Lifting Uk Limited Procédé et appareil pour détecter une distorsion de surcharge

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110759225A (zh) * 2019-11-14 2020-02-07 杨鑫 一种可实时监测预防断裂的起重机吊钩
CN110759225B (zh) * 2019-11-14 2021-04-30 广西建工集团建筑机械制造有限责任公司 一种可实时监测预防断裂的起重机吊钩

Also Published As

Publication number Publication date
US11161719B2 (en) 2021-11-02
DE202019100795U1 (de) 2019-02-22
TW202030143A (zh) 2020-08-16
EP3696132B1 (fr) 2021-08-25
TWI825273B (zh) 2023-12-11
US20200255266A1 (en) 2020-08-13

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