WO1987006568A1 - Mecanisme de verrouillage a deblocage automatique - Google Patents

Mecanisme de verrouillage a deblocage automatique Download PDF

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Publication number
WO1987006568A1
WO1987006568A1 PCT/SE1987/000207 SE8700207W WO8706568A1 WO 1987006568 A1 WO1987006568 A1 WO 1987006568A1 SE 8700207 W SE8700207 W SE 8700207W WO 8706568 A1 WO8706568 A1 WO 8706568A1
Authority
WO
WIPO (PCT)
Prior art keywords
catch
locking mechanism
lifting
release member
lifting arm
Prior art date
Application number
PCT/SE1987/000207
Other languages
English (en)
Inventor
Sven-Göran ERIKSSON
Original Assignee
Artic Nova 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 Artic Nova Ab filed Critical Artic Nova Ab
Publication of WO1987006568A1 publication Critical patent/WO1987006568A1/fr

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
    • B66C1/422—Gripping members engaging only the external or internal surfaces of the articles 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
    • B66C1/62—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 comprising article-engaging members of a shape complementary to that of the articles to be handled
    • B66C1/625—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 comprising article-engaging members of a shape complementary to that of the articles to be handled for gripping drums or barrels

Definitions

  • This invention relates to an automatically releasable locking mechanism for a lifting device intended for lifting and handling objects, also cylindrical ones, said lifting de ⁇ vice having at least two opposite clamping members, at least one of which is supported by a lifting arm connected with a lifting means in the form of an eye or hook, said lifting arm being pivotally connected with a yoke member to move its clamping member, at turning relative to the yoke member, away from or towards the opposite clamping means for releasing - opening the lifting device - and gripping - closing the lift ⁇ ing device, respectively - an object, said locking mechanism comprising catches, one of which is supported by the lifting arm and the other by the yoke member and which are operative, when hooked to each other, to lock the lifting arm relative to the yoke member in an open position for applying the lifting device to an object to be gripped and lifted.
  • Lifting devices of the kind indicated above are pre ⁇ viously known in a lot of different designs for lifting and handling objects of different kinds, e.g. bales, pipes, paper rolls, barrels, plane-parallel building elements etc.
  • Lifting devices of this kind comprise in each case two opposite clamping members supported either by each their lift ⁇ ing arm pivotally connected to a yoke member or by a yoke mem ⁇ ber and a lifting arm pivotally connected to this so that at lifting of the lifting device each lifting arm is made to swing relative to the yoke member to move the clamping members towards each other and in this way to make these grip and clamp an object between themselves.
  • each lifting arm is locked against motion relative to the yoke member by means of a locking mechanism which, as a rule, consists of two catches, one disposed on the lifting arm and the other on the yoke member and which provide said lock ⁇ ing effect in engagement with each other.
  • Fig. 1 is a lateral view of a lifting device provided with a lock ⁇ ing mechanism according to the invention in a position to be applied to an object to be gripped and lifted
  • Fig. 2 shows the lifting device in Fig. 1 in lifting position
  • Fig. 3 shows a section taken along the line III-III in Fig. 1
  • Fig. 4 shows the locking mechanism in locking position
  • Fig. 5 shows the locking mechanism at the start of the release phase
  • fig. 6. shows it at the end of the release phase.
  • the lifting device illustrated in Figs. 1-3 as a barrel lifter is only one among many examples of a lifting device in which a locking mechanism according to the invention can be used to make this type of lifting device operate quite auto- matically. Before an embodiment of the locking mechanism is described in greater detail the illustrated lifting device as such will be described more closely to make it easier to understand what is unique in the locking mechanism of this in ⁇ vention.
  • the lifting device shown on the drawings as an example serves as a barrel lifting means and comprises an L-shaped lifting arm 1 and a likewise substantially L-shaped yoke mem ⁇ ber 2.
  • the lifting arm 1 is at its short section la pivotally connected to one end of the yoke member formed as a fork- shaped ear 3 through a joint 4 for limited pivoting motion in the plane of the drawing around the joint 4.
  • the lifting arm 1 as well as the yoke member 2 are at the free end of their short sections formed or provided with each their clamping member 5 which are shown in the form of a clamping shoe with a gripping surface adapted to the shape of the object to be gripped and lifted.
  • These clamping shoes face each other and are substantially at the same distance beneath the yoke member 2 in the gripping and lifting position of the lifting device shown in Fig. 2, in which they grip and clamp an object be- tween themselves which consists of a barrel in Figs. 1-3, the outer contour of which is marked by dot-and-dash lines 6.
  • the lifting arm 1 In its long section lb the lifting arm 1 is provided with a slit 7 extending from the free end of the section to about its middle.
  • a lifting means 8 in the form of a lifting eye is disposed in this slit 7 freely movable.
  • Two links 9 located on each their side of the lifting arm 1 and extending from the lifting eye to the end section of the yoke member turned from its point of attachment at the lifting arm are articulatedly connected to the lifting eye 8.
  • the two links 9 are guided there movably through slits 10 formed in said end section by means of a guide pin 11 extend ⁇ ing through the yoke member 2 and the links 9.
  • the guide pin is shown in the form of a bolt.
  • the inventive locking mechanism comprises two catches 13, 14, one of which 13 is pivotally arranged in a restricted way at the lifting arm between the ends of its long section, for example in the vicinity of the slit 7 of the lifting arm, while the other catch 14 is fixedly arranged on the yoke member 2.
  • the catch 13 is pivotally suspended in a pin 15 and has an underside 16 serving as guide surface.
  • the fixed catch 14 has an upper side 17 serving as guide surface for coaction with the guide sur ⁇ face 16 of the pivotable catch when the lifting arm 1 is turned down towards the yoke 2 about its joint 4.
  • the catch 13 is turned relative to its pin 15 so that when coac ⁇ tion between the guide surfaces 16, 17 ceases it can swing back by itself into engagement with the fixed catch 14.
  • a force for example from a plate spring 18, as shown in Figs. 1 and 2, another spring or another force-exerting means tend ⁇ ing to swing the catch 13 anti-clockwise in Figs. 1 and 2 and consequently into engagement with the fixed catch 14 as soon as coaction between the guide surfaces 16, 17 of the catches stops.
  • a hook-shaped release means 23 is therefore arranged in accordance with the invention at such a distance under the locking surface 20 of' the fixed catch 14 that the pivotable catch 13 is allowed to swing unprevented into engagement with the fixed catch 14.
  • the release means 23 is supported pivot ⁇ ally by a shaft journal 24 in the same plane as the two catches 13, 14 and has its hook-shaped portion 23a facing the same direction as the catch 14.
  • the release means is so balanced that it tends to abut the shaft portion 14a of the fixed catch with its edge side 23b turned from the hook-shaped portion 23a, the release means 23 being prevented from swing- ing anti-clockwise from the position shown in Fig. 4.
  • the release means 23 has its hook- shaped portion 23a extending by the tip of the fixed catch 14 and has its upper side 25 formed as a guide surface with which the pivotable catch 13 is made to coact at said further down- ward swinging motion of the lifting arm towards the yoke mem ⁇ ber 2.
  • the catch 13 is then swung outwards from the fixed catch 14 against the action of the spring 18, if any, in order to be finally brought into engagement with the hook-shaped portion 23a of the release means, the tip of which is to be at a radial distance from the pivotal point 24 of the release means which is greater than " the radial distance from said pivotal point 24 to the tip of the fixed catch.
  • the lifting device After a gripped object has been lifted and transported to the intended place of deposit the lifting device is lowered until the object is resting on the ground, after which the lifting arm 1 is swung downwards towards the yoke member 2 about its joint 4. The two catches 13, 14 of the locking mechanism will then get in contact with each other and the pivotable catch 13 is ' again brought into engagement with the fixed catch 14. In this position the clamping members 5 of the lifting device are brought apart and losened from the object and the lifting device can be lifted with the lifting arm 1 locked against motion relative to the yoke member 2. The lift ⁇ ing device will then be in its open or fetching position and is prepared to grip the next object to be lifted.
  • catch .13 of the lifting arm fixedly arranged and the catch 14 of the yoke member with associated release means 23 pivotable in a restricted way - for example about the point 25 - clockwise from the position shown in Figs. 4-6 and against the action of a spring force which should then always tend to return the catch 14 to the starting position shown in the last-mentioned figure and to maintain it therein.
  • release means 23 arranged in connection with the upper catch 13, however this being fixed or the corresponding means arranged between the catch and the release means in order to maintain this in its starting position and to return it to the starting position after the release of the catch and conse ⁇ quently the connection between lifting arm and yoke member.
  • the catches 13, 14 can be applied on each their holder 26 and 27, respectively, which are posi- tioned by means of screws 28 or similar attaching means and, moreover, can comprise covering plates, between which and the respective holder 26, 27 the shaft journals 15, 24 can be ar ⁇ ranged, the covering plate covering the fixed catch being so embodied that it is part of the guide surface 17 of the fixed hook and extends above this guide surface to serve as a lateral guide for the pivotable hook 13.
  • the shaft journal 24 of the release means is disposed between a projection 29 connected with the hook 14 and the holder 27.

Landscapes

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

Abstract

Mécanisme de verrouillage pour un dispositif de levage, comportant deux éléments de serrage (5) mutuellement opposés, dont l'un est porté par un bras de levage (1) pourvu d'un moyen de levage (8), ledit bras de levage étant connecté de manière pivotante à un élément de liaison (2) pour déplacer son élément de serrage (5), lors d'une rotation par rapport à l'élément de liaison (2) de manière à l'écarter ou l'approcher de l'élément de serrage (5) opposé, ledit mécanisme de verrouillage comportant des cliquets (13, 14), dont l'un est porté par le bras de levage (1) et l'autre par l'élément de liaison (2) et qui servent à bloquer le bras de levage (1) et l'élément de liaison (2) contre un mouvement relatif dans une position d'ouverture pour l'application du dispositif de levage à des objets qui doivent être soulevés. Pour que le mécanisme de blocage soit automatiquement déblocable un élément de déblocage (23) est disposé au niveau d'un cliquet (13 ou 14), ledit élément de déblocage étant conçu pour être déplaçable par rapport à ce dernier cliquet (13 ou 14) et étant pourvu d'une surface de guidage (25) pour guider l'autre cliquet (14 ou 13) depuis sa position de blocage afin de s'engager dans l'élément de déblocage (23), qui est ainsi amené dans une position où il empêchera l'autre cliquet (14 ou 12) d'entrer dans le cliquet (13 ou 14) au niveau duquel est disposé l'élément de déblocage (23).
PCT/SE1987/000207 1986-04-22 1987-04-22 Mecanisme de verrouillage a deblocage automatique WO1987006568A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8601846-2 1986-04-22
SE8601846A SE460414B (sv) 1986-04-22 1986-04-22 Automatiskt utloesbar spaerrmekanism

Publications (1)

Publication Number Publication Date
WO1987006568A1 true WO1987006568A1 (fr) 1987-11-05

Family

ID=20364296

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1987/000207 WO1987006568A1 (fr) 1986-04-22 1987-04-22 Mecanisme de verrouillage a deblocage automatique

Country Status (3)

Country Link
EP (1) EP0268607A1 (fr)
SE (1) SE460414B (fr)
WO (1) WO1987006568A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991013825A1 (fr) * 1990-03-14 1991-09-19 Accurate Welding Works Pty. Ltd. Appareil de soulevement de produits
ES2133049A1 (es) * 1996-04-10 1999-08-16 Perez Ausejo Amado Dispositivo para manipular barricas.

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE284898C (fr) *
CH432765A (de) * 1966-03-05 1967-03-31 Brand Hans Rundholz-Greifzangengehänge
DK112046B (da) * 1967-11-08 1968-11-04 H Schelde Mekanisk virkende løftetang.
DE1456452A1 (de) * 1966-03-18 1969-02-20 Eckart & Soehne Josef Vorrichtung zum Verladen und Transportieren von Stapelgut,insbesondere Ziegeln
US3561812A (en) * 1969-01-29 1971-02-09 Dixon Automatic Tool Grapple with locking mechanism
DE1958215A1 (de) * 1969-11-19 1971-07-01 Paul Gerhards Sperr- und Ausloesevorrichtung fuer eine Zange zum Bewegen schwerer Lasten

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE284898C (fr) *
CH432765A (de) * 1966-03-05 1967-03-31 Brand Hans Rundholz-Greifzangengehänge
DE1456452A1 (de) * 1966-03-18 1969-02-20 Eckart & Soehne Josef Vorrichtung zum Verladen und Transportieren von Stapelgut,insbesondere Ziegeln
DK112046B (da) * 1967-11-08 1968-11-04 H Schelde Mekanisk virkende løftetang.
US3561812A (en) * 1969-01-29 1971-02-09 Dixon Automatic Tool Grapple with locking mechanism
DE1958215A1 (de) * 1969-11-19 1971-07-01 Paul Gerhards Sperr- und Ausloesevorrichtung fuer eine Zange zum Bewegen schwerer Lasten

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991013825A1 (fr) * 1990-03-14 1991-09-19 Accurate Welding Works Pty. Ltd. Appareil de soulevement de produits
ES2133049A1 (es) * 1996-04-10 1999-08-16 Perez Ausejo Amado Dispositivo para manipular barricas.

Also Published As

Publication number Publication date
SE8601846D0 (sv) 1986-04-22
SE8601846L (sv) 1987-10-23
SE460414B (sv) 1989-10-09
EP0268607A1 (fr) 1988-06-01

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