EP2463226B1 - Teleskopgabel - Google Patents

Teleskopgabel Download PDF

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Publication number
EP2463226B1
EP2463226B1 EP11192272.0A EP11192272A EP2463226B1 EP 2463226 B1 EP2463226 B1 EP 2463226B1 EP 11192272 A EP11192272 A EP 11192272A EP 2463226 B1 EP2463226 B1 EP 2463226B1
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EP
European Patent Office
Prior art keywords
flanges
telescopic fork
fork according
opening
optical device
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.)
Active
Application number
EP11192272.0A
Other languages
English (en)
French (fr)
Other versions
EP2463226A1 (de
Inventor
Maurizio Traversa
Pier Franco Combina
Vanni Ughetto
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.)
Eurofork Srl
Original Assignee
Eurofork Srl
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Publication date
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/075—Constructional features or details
    • B66F9/12—Platforms; Forks; Other load supporting or gripping members
    • B66F9/14—Platforms; Forks; Other load supporting or gripping members laterally movable, e.g. swingable, for slewing or transverse movements
    • B66F9/141—Platforms; Forks; Other load supporting or gripping members laterally movable, e.g. swingable, for slewing or transverse movements with shuttle-type movement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/075—Constructional features or details
    • B66F9/12—Platforms; Forks; Other load supporting or gripping members
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/075—Constructional features or details
    • B66F9/20—Means for actuating or controlling masts, platforms, or forks

Definitions

  • Telescopic forks are used in the fields of automatic manipulation and industrial automation, and are widely applied, for example, in automated warehouses, typically in association with automated lift trucks for moving pallets.
  • a telescopic fork is composed of a fixed lower base and one or more overlapping extendable elements which move in a bilateral telescopic manner for the movement of loads.
  • the number of mobile telescopic elements (two, three or four) is chosen to suit the desired overall length of travel and the size of the loads to be handled.
  • the fork includes a lower fixed base 10 having two vertical central flanges 11, 12 which carry a first set of rollers 13 with horizontal axes.
  • the rollers 13 support, in a telescopically slidable manner, an intermediate slide or travelling element 20.
  • the intermediate slide supports in a telescopically slidable manner, a top slide or travelling element 30 which can directly support the loads to be transferred when in use.
  • the ends of two chains 27 are fixed to the flanges 11, 12 in laterally outer positions, these chains transferring to the top slide 30 the longitudinal sliding motion which is imparted to the intermediate slide 20 by a rack and pinion drive mechanism.
  • This mechanism includes a rotating gear wheel (not shown) carried on the lower base 10 and a longitudinal rack 25 which runs centrally along the whole length of the bottom of the intermediate slide 20 between the flanges 11 and 12.
  • the chains 27 are guided by parallel grooves 26a, 26b formed in the intermediate slide 20.
  • control systems having mechanical or inductive end of stroke switches D mounted outside the body of the fork. This external location makes these end of stroke switches particularly vulnerable during the use of the fork, and increases the overall transverse horizontal dimension of the fork by about 5 to 10 cm.
  • GB 1 383 185 A discloses a telescopic fork according to the preamble of claim 1.
  • the object of the invention is to optimize the available space in a telescopic fork, and, in particular, to place an optical control unit in a protected position for the purpose of controlling the position of the top slide.
  • a preferred embodiment of a telescopic fork according to the invention includes a lower base 10, an intermediate slide 20 which is telescopically mobile with respect to the base 10, and a top platform or slide 30, which in turn is telescopically mobile with respect to the intermediate slide 20.
  • the lower base 10 has a lower horizontal plate 16 from which a pair of vertical lateral flanges 11, 12 extend, the flanges being transversely equidistant from a vertical central or mid-plane P. Viewed in cross section, the base 10 is approximately in the form of an inverted ⁇ symbol.
  • the overall structure of the fork is symmetrical with respect to the vertical mid-plane P.
  • the flanges 11, 12 extend from the base plate 16 symmetrically with respect to the mid-plane P, in intermediate positions between the plane P and the respective opposite longitudinal sides or longitudinal edges 16a, 16b of the plate 16. More specifically, the flanges 11 and 12 are located approximately 1/3 and 2/3 of the way along the distance between the edges 16a, 16b.
  • the flanges 11 and 12 are connected rigidly to one another by a horizontal plate 17, preferably formed by a horizontal plate portion which is made in one piece with the flanges 11 and 12 and which forms, together with the flanges, a single shaped member which is H-shaped when viewed in cross section.
  • a first set of rollers 13 with horizontal axes is mounted in positions transversely outside the flanges 11, 12, in order to support the intermediate slide 20 in a telescopically slidable way on the base 10.
  • the rollers 13 engage in a rolling manner in two guides in the form of lateral longitudinal cavities 21 in the intermediate slide 20.
  • the cavities 21 face the mid-plane P.
  • the intermediate slide has a second pair of lateral longitudinal cavities 22, facing in opposite, transversely outer, directions.
  • the intermediate slide 20 includes a flattened central portion 24 in the form of a horizontal plate which extends in a bridge-like manner above the flanges 11, 12.
  • a longitudinal rack 25 runs centrally along the whole length of the bottom of the intermediate slide 20, projecting from the lower face of the central portion 24 of the slide 20.
  • Parallel longitudinal grooves 26a, 26b are formed in the intermediate slide 20, and act as guides for respective chains (not shown) forming part of a transmission mechanism which transfers to the top slide 30 the sliding motion imparted to the intermediate slide 20 by the rack mechanism.
  • Each of these chains has one end fixed to the lower base 10 and a second end fixed to the top slide 30.
  • the chain transmission mechanism in the fork according to the present invention is located nearer the mid-plane P than it is in the known fork shown in Figure 2 .
  • the vertical flanges 11, 12 are placed farther apart from one another transversely in order not to interfere with the transmission chains (not shown).
  • the chain guiding grooves 26a, 26b are formed in a position nearer the mid-plane P of the fork, in transversely intermediate positions between the vertical planes P11 and P12 in which the flanges 11 and 12 extend from the base 10.
  • the aforesaid configuration enables an optical control unit to be placed in a protected position near the centre of the fork, for directly controlling the position of the top slide.
  • the greater transverse distance between the flanges 11 and 12 increases the lateral space between the rack and at least one of the lateral flanges 11, 12.
  • a first optical device F such as a photocell, mounted at one of the longitudinal ends of the lower base 10 in a laterally protected position between the flanges 11 and 12.
  • a second optical device C for example a reflective element such as a reflector, affixed to the lower face at one of the longitudinal ends of the top slide 30, can be read directly by the photocell F when the opening 23 is aligned between the reflector C and the photocell F.
  • the photocell F, the opening 23 and the reflector C are located in the same plane, preferably a vertical plane.
  • the two optical devices F, C and the opening 23 are aligned along the same ideal straight line when the fork reaches a specified working position, for example the fully retracted end of stroke position.
  • the optical system is protected from impact and does not increase the overall dimensions.
  • the rack 25 extends along the whole length of the intermediate slide, it does not impede the passage of the light rays R emitted by the photocell F and reflected by the reflector C.
  • the plate 17 is optional, and that, if present, it is fixed to the photocell F and must have a through hole 18 or other opening such that the rays R are not blocked.
  • the hole 18 is vertically aligned with the photocell F. It will be understood that the vertical direction of the rays R is not essential.
  • the invention can be applied equally satisfactorily by directing the rays R in an inclined manner with respect to the vertical, and by inclining the reflector C in a corresponding manner if necessary.
  • a relative advantage of the use of a reflector is that it diffuses the reflection towards the receiver in an effective manner without requiring a condition of absolute verticality. If the rays R are inclined with respect to the mid-plane P, the opening 23 in the intermediate slide will be designed or placed in a position such that the passage of the emitted ray and the reflected ray is permitted in a specified position of the fork, typically in the end of stroke position in which the fork is fully retracted.
  • the invention is not necessarily limited to an optical device F comprising a single photocell acting as transmitter and receiver.
  • the incident ray and the reflected ray can form an acute angle between them in a plane confined laterally between one of the vertical planes (P11 or P12) in which one of the flanges 11 (or 12) lies and the side of the rack facing the flange in question.
  • a transmitting optical device and a separate receiving optical device are provided; the opening 23 is in all cases designed so as to permit the passage of both the incident ray and the reflected ray in the end of stroke position.
  • the opening 23 is in the form of a slot, in other words slightly elongate in the longitudinal direction, in order to allow for the mechanical play between the slides in the longitudinal direction.
  • the invention is not limited to the embodiment described and illustrated herein, which is to be considered as an example; in fact, the invention can be modified in respect of shape, dimensions, arrangements of parts, details of construction, and operation.
  • the option of providing a fork with only two mobile slides may be preferred in certain conditions of use, but it is not in any way essential for the purposes of the application of the invention.
  • the invention can be applied in the form of a fork including three or more mobile slides.
  • the intermediate slides between the top slide and the base must have openings such that the passage of the emitted ray and of the reflected ray is permitted in a specified position of the fork, typically in the end of stroke position when the fork is fully retracted.

Landscapes

  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Warehouses Or Storage Devices (AREA)
  • Fluid-Damping Devices (AREA)

Claims (13)

  1. Teleskopgabel, die eine untere Basis (10) und eine Mehrzahl von mobilen Schiebern oder teleskopisch ausfahrbaren Elementen (20, 30) enthält bzw. umfasst, wobei jeder Schieber (20, 30) mittels eines jeweiligen Rollensatzes (13, 14) verschiebbar ist, der symmetrisch zu einer vertikalen Symmetrieebene (P) angeordnet ist, und wobei
    die Basis (10) ein Paar parallele vertikale Flansche (11, 12) aufweist, die sich in jeweiligen vertikalen Ebenen (P11, P12) von einer Basisplatte (16) nach oben erstrecken, wobei die Flansche einen Rollensatz (13) halten, der sich quer bzw. transversal außerhalb der Flansche (11, 12) befindet, um einen Zwischenschieber (20) auf verschiebbare Weise bezüglich der Basis (10) zu stützen bzw. zu tragen,
    dadurch gekennzeichnet, dass
    der Zwischenschieber (20) Längsnuten bzw. -rillen (26a, 26b) aufweist, die als Führungen für Ketten zum Übertragen einer Längsverschiebungsbewegung auf einen oberen Schieber (30) dienen;
    - die Kettenführungsnuten bzw. -rillen (26a, 26b) in transversalen Zwischenpositionen zwischen den vertikalen Ebenen (P11) und (P12) gebildet sind, in denen sich die Flansche (11, 12) der Basis (10) erstrecken, und dadurch, dass
    - zumindest eine erste optische Vorrichtung (F) an der unteren Basis (10) in einer transversalen Zwischenposition zwischen den Flanschen (11) und (12) fixiert bzw. befestigt ist;
    - eine zweite optische Vorrichtung (C) an einer unteren Fläche bzw.
    Oberfläche des oberen Schiebers (30) fixiert bzw. befestigt ist;
    - zumindest eine Öffnung (23) in dem Zwischenschieber oder den Zwischenschiebern (20) zwischen dem oberen Schieber (30) und der unteren Basis (10) gebildet ist, wodurch die Öffnung (23) zwischen er ersten (F) und der zweiten (C) optischen Vorrichtung in zumindest einer Arbeitsposition der Gaben ausgerichtet ist.
  2. Teleskopgabel nach Anspruch 1, dadurch gekennzeichnet, dass sie ferner ein Gestell (25) umfasst, dass sich im Wesentlichen über die gesamte Länge des Zwischenschiebers (20) erstreckt, und dadurch, dass die optischen Vorrichtungen (F, C) und die Öffnung (23) quer bzw. transversal oder längs bzw. lateral zwischen einer idealen vertikalen Ebene (P12), in der sich einer (12) der Flansche erstreckt (11, 12), und einer anderen idealen vertikalen Ebene begrenzt sind, in der sich die Seite des Gestells (25), die diesem Flansch (12) zugewandt und am nächsten ist, erstreckt.
  3. Teleskopgabel nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Öffnung (23) longitudinal länglich ist.
  4. Teleskopgabel nach Anspruch 1 oder 2 oder 3, dadurch gekennzeichnet, dass die Öffnung (23) in einem zentralen Abschnitt (24) gebildet ist, der sich brückenartig über die Flansche (11, 12) erstreckt.
  5. Teleskopgabel nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass in der Arbeitsposition der Gabel die Öffnung (23), die erste (F) und die zweite (C) optischen Vorrichtung in einer vertikalen Ebene ausgerichtet sind.
  6. Teleskopgabel nach Anspruch 5, dadurch gekennzeichnet, dass in der Arbeitsposition der Gabel die Öffnung (23), die erste (F) und die zweite (C) Vorrichtung entlang einer vertikalen geraden Linie ausgerichtet sind.
  7. Teleskopgabel nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Flansche (11, 12) symmetrisch zu der Ebene (P) an transversalen Zwischenpositionen zwischen der mittleren Ebene (P) und den gegenüberliegenden bzw. entgegensetzten longitudinalen Kanten bzw. Rändern (16a, 16b) der Basisplatte (16) angeordnet sind.
  8. Teleskopgabel nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Flansche (11, 12) durch einen horizontalen Plattenabschnitt (17) starr miteinander verbunden sind, der sich über der ersten optischen Vorrichtung (F) befindet und eine Durchgangsöffnung oder Durchgangsloch (18) aufweist, die bzw. das im Wesentlichen vertikal über der optischen Vorrichtung (F) ausgerichtet ist.
  9. Teleskopgabel nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die erste optische Vorrichtung (F) ein optischer Sender/Empfänger, wie eine Photozelle ist.
  10. Teleskopgabel nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die erste optische Vorrichtung (F) an einem der longitudinalen Enden der unteren Basis (10) montiert ist.
  11. Teleskopgabel nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die zweite optische Vorrichtung (C) ein reflektierendes Element, wie einen Reflektor umfasst.
  12. Teleskopgabel nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass sich die zweite optische Vorrichtung (C) an einem der longitudinalen Enden des oberen Schiebers (30) befindet.
  13. Teleskopgabel nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Arbeitsposition der Gabel eine Ende-des-Hubs-Position ist, wenn die Gabel teleskopisch eingefahren ist.
EP11192272.0A 2010-12-10 2011-12-07 Teleskopgabel Active EP2463226B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITTO2010A000985A IT1403012B1 (it) 2010-12-10 2010-12-10 Forcola telescopica

Publications (2)

Publication Number Publication Date
EP2463226A1 EP2463226A1 (de) 2012-06-13
EP2463226B1 true EP2463226B1 (de) 2014-03-19

Family

ID=43737377

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11192272.0A Active EP2463226B1 (de) 2010-12-10 2011-12-07 Teleskopgabel

Country Status (4)

Country Link
EP (1) EP2463226B1 (de)
KR (1) KR101780826B1 (de)
CN (1) CN102556902B (de)
IT (1) IT1403012B1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202017103231U1 (de) 2016-05-31 2017-06-29 Eurofork S.R.L. Teleskopische Gabel
IT202200010799A1 (it) 2022-05-24 2023-11-24 Eurofork S P A Coppia di forcole telescopiche
IT202200010787A1 (it) 2022-05-24 2023-11-24 Eurofork S P A Forcola telescopica

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103991822B (zh) * 2014-06-10 2016-04-06 山西东杰智能物流装备股份有限公司 可精确定位的伸缩式轻型货叉
CN104310281B (zh) * 2014-08-28 2016-09-14 缪慰时 内燃驱动大吨位静液压四向叉车

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1527570A (fr) * 1967-06-16 1968-05-31 Demag Zug Gmbh Appareil de gerbage à plateforme télescopique développable des deux côtés ou d'un seul côté
SE366009B (de) * 1972-07-11 1974-04-08 Bygg Och Transportekonomie Ab
DD102367A1 (de) * 1973-03-12 1973-12-12
JP4674080B2 (ja) 2004-12-14 2011-04-20 株式会社ダイフク スライド式のフォーク装置
CN101885456B (zh) 2010-06-24 2013-05-22 西安航天动力机械厂 一种能够伸缩的货叉

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202017103231U1 (de) 2016-05-31 2017-06-29 Eurofork S.R.L. Teleskopische Gabel
IT202200010799A1 (it) 2022-05-24 2023-11-24 Eurofork S P A Coppia di forcole telescopiche
IT202200010787A1 (it) 2022-05-24 2023-11-24 Eurofork S P A Forcola telescopica
DE102023113382A1 (de) 2022-05-24 2023-11-30 Eurofork S.P.A. Teleskopgabel

Also Published As

Publication number Publication date
EP2463226A1 (de) 2012-06-13
ITTO20100985A1 (it) 2012-06-11
KR101780826B1 (ko) 2017-09-21
IT1403012B1 (it) 2013-09-27
CN102556902A (zh) 2012-07-11
KR20120065227A (ko) 2012-06-20
CN102556902B (zh) 2016-01-20

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