EP0367356B1 - Gabelhubwagen mit Vorschubmechanismus - Google Patents

Gabelhubwagen mit Vorschubmechanismus Download PDF

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Publication number
EP0367356B1
EP0367356B1 EP19890202766 EP89202766A EP0367356B1 EP 0367356 B1 EP0367356 B1 EP 0367356B1 EP 19890202766 EP19890202766 EP 19890202766 EP 89202766 A EP89202766 A EP 89202766A EP 0367356 B1 EP0367356 B1 EP 0367356B1
Authority
EP
European Patent Office
Prior art keywords
mast
forklift
reach mechanism
load
auxiliary
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.)
Expired - Lifetime
Application number
EP19890202766
Other languages
English (en)
French (fr)
Other versions
EP0367356A1 (de
Inventor
Hessel Kooi
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.)
KOOI BV
Original Assignee
KOOI BEHEER BV
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
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Application filed by KOOI BEHEER BV filed Critical KOOI BEHEER BV
Publication of EP0367356A1 publication Critical patent/EP0367356A1/de
Application granted granted Critical
Publication of EP0367356B1 publication Critical patent/EP0367356B1/de
Anticipated expiration legal-status Critical
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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
    • B66F9/122—Platforms; Forks; Other load supporting or gripping members longitudinally movable

Definitions

  • the invention relates to a forklift with a reach mechanism as defined in the introductory part of claim 1.
  • the reach mechanism serves to be able to pick up or set down a load at a distance from the forklift, for instance when the truck cannot come close enough because of obstacles on the ground, or when work is being carried out with a rack in which pallets are disposed in two rows behind each other.
  • a drawback of the known reach mechanism is that the carrying capacity of a forklift provided with such a mechanism is strictly limited.
  • the load engaging means are situated at a distance from the main mast, which corresponds with the design reach distance plus the distance which the load engaging means already have in relation to the main mast in the retracted position of the reach mechanism, as a result of the space taken up thereby.
  • the invention has for its object to provide a forklift of the sort described in the preamble wherein the carrying capacity, taking into account the design reach distance, is as large as possible.
  • this object is achieved with a forklift having the characterizing measures as mentioned in the characterizing portion of claim 1.
  • the parts of the reach mechanism in the retracted position thereof, hereby lie at least virtually inside the main mast.
  • the load engaging means are therefore situated at practically the same distance from the main mast as in a similar forklift without reach mechanism. In the extended position of the reach mechanism the load engaging means are thus not situated further from the main mast than the design reach distance.
  • An additional advantage of the forklift according to the invention is that in the retracted position of the reach mechanism a load on the load bearer is situated as closely as possible to the main mast, so that driving the forklift according to the invention with a load involves no greater danger of tipping over than is the case with a similar forklift without reach mechanism.
  • a further important advantage of the invention is that the reach mechanism in the retracted position thereof does not increase the total length of the forklift. This is particularly important for transportable forklifts, which are carried behind a truck. In accordance with traffic regulations such a transportable forklift qualifies as a load protruding behind the truck. Stringent limitations are applied to the distance over which a load may protrude.
  • a further improvement of the torsional stiffness is obtained when according to the invention the pivoting points of the pairs of scissor levers are mutually connected in torsion stiff manner by a connecting shaft.
  • Fig. 1 shows a schematic side view of a forklift according to the invention, with extended reach mechanism.
  • Fig. 2 shows a partially broken away perspective view of a portion of the forklift from fig. 1.
  • Fig. 3 shows a front view according to arrow III in fig. 2.
  • Fig. 4 shows a vertical section along line IV-IV in fig. 3.
  • the forklift 1 shown in the figures comprises a frame 2 which can move over a ground surface by means of wheels 3 connected thereto.
  • the forklift 1 is of the transportable type, wherein the front wheels 3 normally lie at a distance in front of the mast construction 4, so that the centre of gravity of a transported load lies within the support surface defined by the wheels. Therefor, no counter weight is necessary and the forklift can have a light construction.
  • load bearer 5 which is provided with load engaging means such as forks 6.
  • Drive means here in the form of piston cylinder devices 7, engage the load bearer to move the load bearer 5 up and downward along the mast 4.
  • the load bearer 5 comprises a reach mechanism here generally designated 8, which makes it possible to displace the lifting forks 6 between a retracted position, wherein the lifting forks are situated close to the mast 4, and an extended position, as shown in fig. 1.
  • the reach mechanism 8 is operated using a piston cylinder device 15.
  • the lifting forks 6 can be moved to a position in front of the front wheels 3, by extending the reach mechanism 8.
  • the lifting forks 6 can thus be inserted into a pallet on the load carrying floor of the truck and this pallet can be picked up, even when the wheels 3 cannot travel beneath the truck because for instance a wheel of the truck is situated at that location.
  • the reach mechanism 8 comprises an auxiliary mast 23 guided movably along the main mast 4, a reach mechanism mast 22 supporting the load engaging means 6 and two pairs of scissor levers, each comprising two scissor levers 9, 10.
  • the scissor levers 9 are connected with their lower ends to the auxiliary mast 23 in a fixed point of rotation 11, while the scissor levers 10 are connected with their lower ends to the reach mechanism mast 22 in a fixed point of rotation 12.
  • the main mast 4 As can be seen from the figures the main mast 4, the auxiliary mast 23 and the reach mechanism mast 22 are each assembled from two pillars placed at a mutual distance.
  • the upper ends of the levers 9 and 10 are connected respectively to the reach mechanism mast 22 and the auxiliary mast 23 by means of a point of rotation slidable along the respective mast.
  • the main mast 4 comprises an outer mast 25 connected to the frame and an inner mast 24 slidable therein.
  • the auxiliary mast 23 is again mounted slidably in the inner mast 24 by means of rollers 31, 32.
  • the piston cylinder devices 7 are connected with a bottom end to the outer mast 25 and with their top end to a beam connecting the inner masts 24.
  • On either side at the top and bottom the inner mast 24 supports the respective pulleys 26 and 28.
  • a cable 27 is tensioned around each pair of associated pulleys 26 and 28.
  • the outer portion of the cable 27 is fixedly connected in each case to the outer mast 25, close to the upper end thereof.
  • the inner portion of the cable 27 is connected in each case to the auxiliary mast 23, close to the upper end thereof.
  • the upper ends of the pairs of scissor levers 9 and 10 are in each case connected to each other in torsion stiff manner by the respective connecting shafts 19 and 18.
  • the ends of these shafts carry rollers slidable in the respective reach mechanism mast 22 and auxiliary mast 23.
  • the lower ends of the scissor levers 9 are likewise connected to each other in torsion stiff manner by means of a connecting shaft 18.
  • the ends of this connecting shaft are mounted rotatably in the auxiliary mast 23 and in line therewith rollers 31 are arranged, by means of which the auxiliary mast 23 can be moved in the inner mast 24.
  • rollers 32 Arranged at the upper end of the auxiliary mast 23 are corresponding rollers 32.
  • the scissor levers 9 and 10 are rotatably connected to each other in a pivoting point 16.
  • the levers 9 are mutually connected in the pivoting point 16 in torsion stiff manner by the connecting shaft 20, while the levers 10 are rotatably mounted in line with this shaft 20.
  • each scissor lever 9, 10 is arranged out of the middle between the points of rotation at the ends.
  • the distance between the point of rotation 12 and the pivoting point 16 is smaller than the distance between the point of rotation 13 and the pivoting point 16 of the lever 10.
  • the distance between the point of rotation 14 and the pivoting point 16 is smaller than the distance between the point of rotation 11 and the pivoting point 16 of the levers 9.
  • the mentioned distances of the respective levers 9 and 10 are in each case equal on the same side of the pivoting point 16. For proper operation, that is, a guiding such that the reach mechanism mast 22 remains in each case parallel to the auxiliary mast 23, it is sufficient that only the ratio of these distances is equal in each lever.
  • the respective pillars of the reach mechanism mast 22 are disposed at a distance such that in the folded in state the outer scissor levers 10 again fall inside them.
  • the pillars of the auxiliary mast 23 are again placed at a distance such that the pillars of the reach mechanism mast 20 again fall between them. The whole reach mechanism therefore falls in the retracted position at least virtually within the space defined by the outer mast 25 of the main mast 4.
  • the mast construction according to the invention can be used in combination with a so-called "side shift".
  • this comprises a transverse guide bar 36 arranged in the frame and on which the mast construction rests using wheels 33. These wheels 33 are mounted in a beam fixedly connected to the outer mast 25. This construction is per se known and will not be further described in detail.

Landscapes

  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Forklifts And Lifting Vehicles (AREA)

Claims (4)

  1. Gabelhubwagen (1) mit einem Rahmen (2), der einen Hauptmast (4) trägt, mit einem Lastträger, der Lastträgermittel (6), wie z.B. Gabeln aufweist und mit einem Antrieb (7), der mit dem Lastträger verbunden ist, um den Lastträger längs des Mastes (4) nach oben und unten zu bewegen, wobei der Lastträger einen Vorschubmechanismus (8) aufweist, der einen Hilfsmast (23) besitzt, der beweglich längs des Hauptmastes (4) geführt ist und ein Mast (22) für den Vorschubmechanismus die Lastträgermittel (6) und zwei Paare von Scherenhebelmechanismen (8) trägt, die den Mast (22) des Vorschubmechanismus verbinden und parallel auf den Hilfsmast (23) hin und von diesem zurück beweglich sind, wobei der Anlenkpunkt (16) eines jeden Paares von Scherenhebeln (9,10) außerhalb der Mitte zwischen den Drehpunkten an den Enden derart angeordnet ist, daß in der zurückgezogenen Stellung die Achsen der Drehpunkte der Scherenhebel (9,10) eines jeden Paares vertikal relativ zueinander versetzt sind,
    dadurch gekennzeichnet, daß der Hauptmast (4), der Hilfsmast (23) und der Mast des Vorschubmechanismus jeweils aus zwei Säulen bestehen, die in einem gegenseitigen Abstand zueinander angeordnet sind, wodurch die Scherenhebel (9,10) innerhalb des Mastes (22) des Vorschubmechanismus zu liegen kommen, der Mast (22) des Vorschubmechanismus innerhalb des Hilfsmastes (23) zu liegen kommt und der Hilfsmast (23) innerhalb des Hauptmastes (4) zu liegen kommt.
  2. Gabelhubwagen nach Anspruch 1,
    dadurch gekennzeichnet, daß wenigstens eine der entsprechenden Enden der Paare von Scherenhebeln miteinander torsionssteif über eine Verbindungswelle verbunden sind.
  3. Gabelhubwagen nach den Ansprüchen 1 oder 2,
    dadurch gekennzeichnet, daß die Schwenkpunkte der Paare von Scherenhebeln miteinander torsionssteif durch eine Verbindungswelle verbunden sind.
  4. Gabelhubwagen nach einem der vorhergehenden Ansprüche,
    dadurch gekennzeichnet, daß der Gabelhubwagen transportabel ist, um hinter einem Lastwagen mitgeführt werden zu können.
EP19890202766 1988-11-04 1989-11-02 Gabelhubwagen mit Vorschubmechanismus Expired - Lifetime EP0367356B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8802712A NL8802712A (nl) 1988-11-04 1988-11-04 Vorkhefwagen met reikschaar.
NL8802712 1988-11-04

Publications (2)

Publication Number Publication Date
EP0367356A1 EP0367356A1 (de) 1990-05-09
EP0367356B1 true EP0367356B1 (de) 1993-04-07

Family

ID=19853171

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890202766 Expired - Lifetime EP0367356B1 (de) 1988-11-04 1989-11-02 Gabelhubwagen mit Vorschubmechanismus

Country Status (3)

Country Link
EP (1) EP0367356B1 (de)
DE (1) DE68905899T2 (de)
NL (1) NL8802712A (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL9400340A (nl) * 1994-03-04 1995-10-02 Blom R Beheer Bvr Reikinrichting voor het in een richting dwars op een hefmast, translerend verplaatsen van een last.
IE20030193A1 (en) 2003-03-14 2004-09-22 Moffett Res & Dev Ltd A forklift loading support
NL1030868C2 (nl) * 2006-01-06 2007-07-09 Quick Group B V Inrichting en werkwijze voor het heffen van lasten.
US20140219758A1 (en) * 2013-02-04 2014-08-07 Crown Equipment Corporation Reach assembly with improved operator visibility for a materials handling vehicle
CN105365868B (zh) * 2015-11-30 2018-06-19 惠安君献石业有限公司 一种实木地板用木材烘干搬运车
CN110758501A (zh) * 2019-10-31 2020-02-07 如皋市宝象叉车有限公司 一种便携式电动手推车
CN114537493A (zh) * 2022-03-01 2022-05-27 南京晓庄学院 一种具有适用环境影响功能的工程机械转移装置

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2752058A (en) * 1953-07-22 1956-06-26 Raymond Corp Material handling lift truck
DE1134029B (de) * 1959-02-10 1962-07-26 Steinbock G M B H Hublader mit einem mittels Scheren vorschiebbaren Lasttraeger
US3082894A (en) * 1960-06-09 1963-03-26 Raymond Corp Lift truck reach mechanism
US3048293A (en) * 1960-09-16 1962-08-07 Walton W Cushman Side-loading counterbalanced industrial lift truck
GB1030788A (en) * 1962-12-06 1966-05-25 Aloysius Thedorus Van Huet A transporting device for a stack of bricks for mounting on a fork-lift truck
US3219210A (en) * 1963-09-06 1965-11-23 Steinbock Gmbh Mast assembly for a side loading truck
DE1506446A1 (de) * 1966-01-27 1969-06-26 Dso Balkancar Gabelstapler
US3757977A (en) * 1971-09-30 1973-09-11 Brudi Equipment Tote pan handler attachment for lift trucks

Also Published As

Publication number Publication date
DE68905899D1 (de) 1993-05-13
DE68905899T2 (de) 1993-07-15
NL8802712A (nl) 1990-06-01
EP0367356A1 (de) 1990-05-09

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