EP3736243A1 - Crochets de levage de sécurité - Google Patents

Crochets de levage de sécurité Download PDF

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Publication number
EP3736243A1
EP3736243A1 EP20151671.3A EP20151671A EP3736243A1 EP 3736243 A1 EP3736243 A1 EP 3736243A1 EP 20151671 A EP20151671 A EP 20151671A EP 3736243 A1 EP3736243 A1 EP 3736243A1
Authority
EP
European Patent Office
Prior art keywords
locking
lever
locking lever
load
load hook
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
EP20151671.3A
Other languages
German (de)
English (en)
Other versions
EP3736243B1 (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 EP3736243A1 publication Critical patent/EP3736243A1/fr
Application granted granted Critical
Publication of EP3736243B1 publication Critical patent/EP3736243B1/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

Definitions

  • the invention relates to a safety load hook with a lower part which forms a suspension bend and to which an upper part is pivotably attached via a connecting bolt which, in an open position pivotable with respect to the lower part, allows the suspension of a load on the suspension bend and in a closed position the suspension bend of the Covering the lower part to the outside in such a way that the introduction of a load to be absorbed into the suspension bend or the removal of a load contained therein is prevented.
  • Safety load hooks are load hooks that are designed in such a way that, in the closed position of the load hook, the bending of the lower part is completely or almost completely covered by the upper part (with a remaining small opening gap of up to 3 mm in accordance with EN 818-6) is held in this closed position by a locking arrangement. This prevents unintentional unhooking of a load or other element received in the hook.
  • the locking For the open position of the lower part, the locking must first be released in order to be able to rotate the upper part and thereby to be able to unhook or hang up the picked up or picked up load or the like on the hook mouth.
  • the locking arrangement can consist of a locking lever, a spring that holds it in a locking position, and a support bolt with which the locking lever and the spring are connected to the lower part of the hook.
  • the locking effect can also be omitted and the upper part can open. This occurs when, due to the dynamics of the process, the mass of the locking lever results in such a large inertial force that it overcomes the force of the pretensioning spring and the locking lever opens, which in turn releases the upper part.
  • a completely pivotable hook is provided, which can be brought into a closed position and an open position. In the closed position, the hook is positively held by a locking element which can be locked into a latching recess and which in turn can be released again via a remote control, the hook itself being biased into its release position by a spring.
  • a remote control is expensive.
  • the invention aims to propose a load hook of the type mentioned above, in which the above-mentioned undesired unlocking of the locking lever if too great a force is incorrectly applied to the upper part of the safety load hook or if it hits you with great dynamism without the use of a remote-controlled lock Object can be avoided in an almost vertical direction downwards.
  • a safety load hook of the type mentioned in which, in the closed position, the upper part can be blocked with respect to the lower part by means of a locking arrangement which comprises a locking lever with a receiving bore, which around a support bolt arranged in this bore in a release position and in a The locking position is pivotable, can be preloaded into the locking position by means of a tension spring, is fastened together with the tension spring via the support bolt on the lower part and in the locking position with a shaped projection engages in an assigned shaped receptacle on the upper part, the locking lever being designed with a lever section on its side opposite the shaped projection with respect to the receiving bore so that the center of gravity of the locking lever is essentially on the outer surface of the receiving bore for the support bolt or within which is enclosed by this cross-sectional area, and the locking lever is supported in the locking position via the free end of its lever portion on the lower part.
  • the center of gravity of the locking lever is particularly preferably located on the center axis of the receiving bore for the support bolt.
  • a locking lever is now used, which is formed on its side opposite the shaped projection with respect to the receiving bore with a lever section such that the center of gravity of the locking lever is essentially on the outer surface of the receiving bore for the support bolt or within the cross-sectional area enclosed by this, thus comes to lie directly or almost in the pivot point of the locking lever.
  • the lever section provided there is also designed so that the locking lever is supported in its locking position via the free end of the lever section on the lower part and thus with the occurrence of incorrect use too high a force on the tip of the upper part of the load hook due to the support of the locking lever on the lower part, an undesired shearing of the support bolt of the locking lever is prevented.
  • the center of gravity of the locking lever can lie not only within the cross-sectional area enclosed by the surface of the receiving hole for the support bolt, but also "essentially" on the surface of the receiving hole, then this should take into account that a training with a center of mass is exactly the lateral surface in the practical case is often not exactly achieved because of the inevitable in the production of such locking levers, even if only slight tolerance deviations in the shape of the locking lever, so that as a result, a slight Deviation of the position of the center of gravity of the locking lever should be detected slightly outside of the cross section enclosed by the lateral surface.
  • a particularly preferred embodiment of the invention is that the lever portion of the locking lever is provided with a recess within which the tension spring is securely held in the assembly position, which makes assembly much easier and the often required use of an assembly aid to hold the tension spring in the Makes mounting position dispensable.
  • the lever portion of the locking lever is supported in its locking position via a substantially straight or only slightly curved, spherical end surface at its free end on a correspondingly assigned counter surface on the lower part, which compared to the case of a rounded or point-like support point a particularly effective support of the locking lever on the lower part is achieved.
  • the recess of the lever section for receiving the tension spring is also delimited on both sides of the lever section by one side flank of the same, whereby a pocket-like recess for the tension spring that is easy to manufacture is created.
  • the locking lever is particularly preferably designed so that its center of gravity is located centrally between these two side flanks of the lever section.
  • FIG. 1 a central cross-section of a safety load hook is shown as it is known from the prior art, while the representations of FIG Figures 2 to 6 show an embodiment of a load hook according to the invention, the description of the known load hook according to Fig. 1 for understanding the in the Figures 2 to 6 illustrated embodiment of a safety load hook according to the invention is helpful.
  • a safety load hook 1 which has a lower part 2 which allows a suspension bend 3 for hanging a load (which is not shown in all figures) for transportation with the safety load hook 1.
  • an upper part 4 is provided which is pivotably attached to the lower part 2 via a connecting bolt 5 and in turn is connected to a suitable connection, such as, for. B. a coupling connection (as in the Figs. 1 to 3 shown), or an eyelet or a swivel.
  • a suitable connection such as, for. B. a coupling connection (as in the Figs. 1 to 3 shown), or an eyelet or a swivel.
  • the upper part 4 can be brought into a closed position by pivoting, as in the Figures 1 and 4th is shown: In this the hanging bend 3 is completely covered to the outside (as in Fig. 2 shown). Instead, however, a small residual gap could also remain such that in any case a load attached to the suspension bend 3 is always securely held by the load hook 1 during handling and cannot unintentionally get out of the suspension bend 3. Such a residual gap can be up to 3 mm according to EN 818-6.
  • the upper part 4 of the load hook 1 is opened outwards around the connecting bolt 5 opposite the lower part 2, as shown in the side view of FIG Fig. 3 is shown, which also applies to the in Fig. 1 shown safety hook 1 applies.
  • a locking arrangement which is provided overall with the reference numeral 6, and which, like the Figures 1 , 2 and 4th show, comprises a pivotable locking lever 7 which can be pivoted about a support pin 9 relative to the lower part 2 and has a receiving bore 8 (cf. Fig. 5 ), through which the support bolt 9 runs and serves as a pivot axis for the locking lever 7.
  • the locking arrangement 6 also comprises a tension spring 10 which, in the locking position of the locking arrangement 6, in which the lower part 2 and the upper part 4 are locked relative to one another in the closed position of the load hook 1, biases the locking lever 7 into a locking position in which a The shaped projection 11 attached to the locking lever 7 engages in an associated shaped receptacle 12 on the side of the upper part 4 facing it to form a latch.
  • a tension spring 10 which, in the locking position of the locking arrangement 6, in which the lower part 2 and the upper part 4 are locked relative to one another in the closed position of the load hook 1, biases the locking lever 7 into a locking position in which a The shaped projection 11 attached to the locking lever 7 engages in an associated shaped receptacle 12 on the side of the upper part 4 facing it to form a latch.
  • the shaped projection 11 is designed in the form of an outwardly protruding small lever arm, which forms a V-shaped end face at its protruding end in cross section, with which it can be inserted into a correspondingly designed shaped receptacle 12 on the facing side of the upper part 4 engages in the form of a recess, whereby the desired locking is achieved.
  • the locking lever 7 is biased into its locking position by the biasing spring 10, so that when the locking position is reached, as shown in FIG Fig. 1 is shown, an undesired release of the locking effect is avoided.
  • the arrangement can be made from Fig. 1 also lead to the fact that the load hook 1, when it hits a stop in the vertical direction with relatively great dynamics, as a result of the inertial energy of the locking bolt 7 can lead to an opening moment acting on this in the opening direction, counter to the biasing action of the tensioning spring 10 and exceeding its biasing moment, whereby the shaped projection 11 is unscrewed from the shaped receptacle 12 and thus in turn an undesired loss of the locking effect between upper part 4 and lower part 2 entry.
  • the locking lever 7 is provided with a lever section 13 on its side opposite the shaped projection 11 with respect to the receiving bore 8 for the support bolt 9, which opposite the shaped projection 11 with respect to the receiving bore 8 is a counterweight as part of the construction of the locking lever 7 forms and is designed so that the center of gravity S of the locking lever 7 lies on the outer surface M of the receiving bore 8, as shown in FIG Fig. 5 is shown, or within the cross-sectional area Q of the receiving bore 8 enclosed by the lateral surface M.
  • the locking lever 7 should very preferably be designed in such a way that the center of gravity S is also centered in the direction of view A Fig. 5 seen view of the locking lever 7, as shown in Fig. 6 is shown lies.
  • the locking lever 7 By designing the locking lever 7 so that its center of gravity S is to lie essentially on the lateral surface M of the receiving bore 8 or within the surface cross-section Q of the receiving bore 8 enclosed by this lateral surface M , a state is created which is also maintained in the event of a violent vertical impact Load hook 1 on a collision element creates a situation in which it suddenly affects the center of gravity S. acting mass moment of inertia of the locking lever 7 is so low that its effect in the opening direction of the locking lever 7 can no longer exceed the biasing effect of the same by the tension spring 10 in the locking direction. This is particularly true when (as not shown in the figures) the locking lever 7 is designed so that its center of gravity S lies on the central axis of the receiving bore 8 or also within the opening area of the receiving bore 8 enclosed by the lateral surface M.
  • the shape of the locking lever 7 and the opposite end surface of the lower part 2 of the load hook 1 in the load hook 1 shown is designed so that the locking lever 7 also holds the upper part 4 in its open position in this open position by the shaped projection 11 here with its side flank 14 facing away from the outside of the safety load hook 1 comes to rest against an outer contact surface 15 on the outside of the upper part 4 and is held in this contact by the tension spring 10, whereby an undesired folding back of the upper part 4 is prevented in its closed position.
  • the corresponding shapes of the shaped projection 11 and the upper part 4 are expressly referred to in the Figs. 2 and 3 Shown designs of these parts referenced.
  • the load hook of the Figs. 2 to 4 the tension spring 10 sits within a recess 19 in the lever section 13, which is delimited on both sides by a side flank 20 and forms a type of receiving pocket in which the tension spring is held in its assembly position.
  • a lever arm 18 is attached to the locking lever 7, by means of which it is possible to open the locking arrangement 6 from its locking position and thereby release the upper part 4, so that this, as in Fig. 3 shown, can be rotated into its open position in order to hang a load in the hanging bend 3 of the lower part 2 or to pull out a load hanging there.
  • the tension spring 10 presses the shaped projection 11 with its side surface 14 again in the direction of the facing side of the upper part 4 until the side surface 14 rests against the outer contact surface 15 there, whereby the in Fig. 3 The position shown occurs, in which the upper part 4 is held in its open position.
  • This holding position of the upper part 4 can then, as soon as desired, either again by actuation of the lever arm 18 or by a somewhat larger closing moment acting on the upper part 4, and the latter is returned to its in Fig. 2 Shown closed position are transferred, in which then the locking lever 7 is its locking position, as in the Fig. 2 and 4th is shown, under the action of the tension spring 10 can resume.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Hooks, Suction Cups, And Attachment By Adhesive Means (AREA)
EP20151671.3A 2019-02-12 2020-01-14 Crochets de levage de sécurité Active EP3736243B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102019103517.1A DE102019103517B4 (de) 2019-02-12 2019-02-12 Sicherheitslasthaken

Publications (2)

Publication Number Publication Date
EP3736243A1 true EP3736243A1 (fr) 2020-11-11
EP3736243B1 EP3736243B1 (fr) 2021-08-18

Family

ID=69174305

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20151671.3A Active EP3736243B1 (fr) 2019-02-12 2020-01-14 Crochets de levage de sécurité

Country Status (4)

Country Link
US (1) US11142432B2 (fr)
EP (1) EP3736243B1 (fr)
DE (1) DE102019103517B4 (fr)
TW (1) TWI825272B (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2425867A1 (de) * 1973-06-01 1974-12-19 Bulten Kanthal Ab Sicherheitshaken
FR2491901A3 (fr) * 1980-10-10 1982-04-16 Charlet Sa Crochet de securite
EP0080955B1 (fr) * 1981-11-30 1986-03-19 FORGES DE LA BECQUE société anonyme Crochet de levage avec dispositif de sécurité
SE8500447L (sv) * 1985-02-01 1986-08-02 Thomas Berglund Sekerhetslastkrok
CA2489760A1 (fr) 2003-12-10 2005-06-10 Cranston Diversified Industries, Inc. Crochet de levage de charge telecommande et methodes connexes
DE102007027746A1 (de) 2007-06-15 2008-12-18 Ludwig Giritzer Vorrichtung mit einem Haken zum Anhängen eines Gegenstandes

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US731162A (en) * 1902-12-31 1903-06-16 Charles W Carter Snap-hook.
US1514781A (en) * 1923-03-15 1924-11-11 Muse John Birt Fastening device
US1520576A (en) * 1924-05-01 1924-12-23 Keaton James Ralph Hook
US2027376A (en) * 1934-08-10 1936-01-14 Byron Jackson Co Safety hook
US2705357A (en) * 1952-09-09 1955-04-05 Davick Einar Closed hooks
US3940173A (en) * 1975-02-10 1976-02-24 Columbus Mckinnon Corporation Safety hook
US4309052A (en) * 1980-03-07 1982-01-05 Acco Industries Inc. Safety hook
FR2520711B1 (fr) * 1982-02-02 1986-07-25 Henrion Blaise Perfectionnements apportes aux crochets a verrouillage
GB2116624B (en) * 1982-03-11 1985-03-20 Rfd Ltd Releasable connector
US4977647A (en) * 1989-10-27 1990-12-18 D.B. Industries, Inc. Double locking snap hook
JPH0967079A (ja) * 1995-08-31 1997-03-11 Unie Concept:Kk 重量物吊上げ用フック装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2425867A1 (de) * 1973-06-01 1974-12-19 Bulten Kanthal Ab Sicherheitshaken
FR2491901A3 (fr) * 1980-10-10 1982-04-16 Charlet Sa Crochet de securite
EP0080955B1 (fr) * 1981-11-30 1986-03-19 FORGES DE LA BECQUE société anonyme Crochet de levage avec dispositif de sécurité
SE8500447L (sv) * 1985-02-01 1986-08-02 Thomas Berglund Sekerhetslastkrok
CA2489760A1 (fr) 2003-12-10 2005-06-10 Cranston Diversified Industries, Inc. Crochet de levage de charge telecommande et methodes connexes
DE102007027746A1 (de) 2007-06-15 2008-12-18 Ludwig Giritzer Vorrichtung mit einem Haken zum Anhängen eines Gegenstandes

Also Published As

Publication number Publication date
DE102019103517A1 (de) 2020-08-13
US11142432B2 (en) 2021-10-12
TW202030142A (zh) 2020-08-16
DE102019103517B4 (de) 2021-04-22
US20200255265A1 (en) 2020-08-13
TWI825272B (zh) 2023-12-11
EP3736243B1 (fr) 2021-08-18

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