EP2295366B1 - Mât pour chariot élévateur à fourche - Google Patents

Mât pour chariot élévateur à fourche Download PDF

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Publication number
EP2295366B1
EP2295366B1 EP10176891A EP10176891A EP2295366B1 EP 2295366 B1 EP2295366 B1 EP 2295366B1 EP 10176891 A EP10176891 A EP 10176891A EP 10176891 A EP10176891 A EP 10176891A EP 2295366 B1 EP2295366 B1 EP 2295366B1
Authority
EP
European Patent Office
Prior art keywords
mast
pair
profiles
forklift truck
profile elements
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.)
Not-in-force
Application number
EP10176891A
Other languages
German (de)
English (en)
Other versions
EP2295366A1 (fr
Inventor
Harold Antonetta de Gouw
Hubertus Antonius de Gouw
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.)
Max Holland Forklift Europe
Original Assignee
Max Holland Forklift Europe
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 Max Holland Forklift Europe filed Critical Max Holland Forklift Europe
Publication of EP2295366A1 publication Critical patent/EP2295366A1/fr
Application granted granted Critical
Publication of EP2295366B1 publication Critical patent/EP2295366B1/fr
Not-in-force legal-status Critical Current
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
    • B66F9/08—Masts; Guides; Chains

Definitions

  • This invention relates to a mast for forklift trucks, and similar machines. More specifically this invention relates to a telescopic mast with an increased visibility range, through the middle of the mast.
  • a particular object of the invention is to provide an alternative mast structure that allows the mast to be positioned partially above the wheels of a forklift truck. Alternatively it is also an object of the invention to at least provide the public with a useful choice.
  • the invention provides a telescopic mast for a vehicle such as a forklift truck including at least an outer mast part and an inner mast part, which outer and inner mast parts are slidable with respect to each other, wherein the outer and inner mast parts are each provided respectively with an outer pair and an inner pair of left and right profile elements, wherein the inner pair of left and right profile elements of the inner mast part are mounted in between the outer pair of left and right profile elements of the outer mast part, and wherein the left and right profile elements of the outer pair are shorter in length than the left and right profile elements of the inner pair.
  • the operator's visibility range is increased with the mast according to this invention, by placing the guiding profiles, also called mast profiles, more outwardly.
  • the outer mast profile is therefore positioned above the tyres of the forklift truck.
  • this profile will be shorter than the inner mast profile(s), so that the fork carriage will be able to be lowered right down to the ground.
  • the characteristics of this invention are that the outer mast profile(s) is situated above the tyres or wheels and the fact that there is a difference in length between the different mast profiles.
  • the mast profiles When all parts have been lowered and the mast is therefore in its lowest position, all parts of the mast profiles will be lined up at the top, whereas at the base, the inner profile(s) extends between the tyres and wheels, and the outer one not.
  • the outer mast profiles are partially or entirely positioned above the wheels or tyres to create a wider opening to the inner mast section.
  • the increased mast opening offers a significantly better view of the forks compared to the conventional forklift mast with comparable clearance height.
  • a comparable lifting height can easily be re-established by adding additional shorter mast parts outwardly of the inner mast part.
  • the telescopic mast according to the invention can also optionally be provided with an additional middle mast part with a middle pair of left and right profile elements, arranged to be slidable in a position with the left and right profile elements of the outer pair outwardly and with the left and right profile element of the inner pair inwardly of the left and right profile elements of the middle pair of the middle mast part.
  • the middle mast profiles may also be positioned above the front wheels of a forklift truck.
  • the telescopic mast further includes a fork carriage, adapted to carry at least one single fork, clamp, or other attachment for carrying a load.
  • This fork carriage can be attached to the inner mast part, when the outer mast part's lower end is adapted to be attached to a vehicle, such as a forklift truck, preferably with the option of being tilted with respect thereto.
  • the fork carriage can also be attached to the outer mast part, when only the inner mast part and not the outer mast part's lower end is adapted to be attached to a forklift truck.
  • a general benefit of telescopic masts for forklift trucks is that an increased lifting height does not need to result in an increased height of the forklift truck. There is some freedom in design as to whether the innermost mast part or the outermost mast part is attached to the truck. As a consequence the fork carriage will then be carried by the other of the inner and outermost mast part.
  • the telescopic mast preferably has the individual pairs of left and right mast profiles arranged to be unequal in length, with respect to each other, and with a front view of the assembled mast being wider at its top and narrower at its bottom and being inherently funnel shaped.
  • the invention thus relates to a new specific construction of the outer mast part i.e. the outer mast parts for forklift trucks, reach trucks, stackers and otherwise of machines which move pallets and/or goods in a vertical manner, with a particular purpose of creating a better view through the mast of the goods to be moved or lifted.
  • the outer mast part i.e. the outer mast parts of a triple mast
  • the outer mast part are positioned partially or entirely above the tyres which causes the mast profiles to be a bit wider apart, thus resulting in a wider opening in the inner mast part.
  • the wider opening provides a significant improvement in visibility of the forks and the load to be lifted. Therefore, an important aspect of this invention is positioning the outer mast profiles entirely or partially above the tyres or the conveying means of the forklift truck.
  • the invention also provides a combination of a forklift truck and a telescopic mast having the technical features of the invention.
  • a forklift truck and a telescopic mast having the technical features of the invention.
  • the pair of inner mast profiles is positioned in between front wheels while the outer pair of left and right mast profiles is positioned above the wheels, wherein the individual pairs of left and right mast profiles are unequal in length and wherein a frontal view of the assembled mast is inherently funnel shaped, being wider at its top and narrower at its bottom.
  • each outer mast part's lower end joins the lower narrowest part of the funnel construction, the lower narrowest part of the outer mast profile, which has no guiding function, thereby serves to mount the mast to the forklift truck and pivotably connects to a titling point at a front axle of the forklift truck.
  • the combination according to the invention may also advantageously have the outer left and right mast profiles, positioned either entirely or partially above the wheels or like conveying means of the forklift truck.
  • the lower narrow part of the outer mast part can advantageously be mounted towards the back, diagonally above the axle.
  • the titling point of the mast may be positioned higher than the lower narrow part of the outer mast part.
  • the combination according to the invention may also preferably be equipped with a triple or multiple part mast and have the middle pair of mast profiles substantially the same length as the outer mast part, but shorter than the mast profiles of the inner mast part, so that the middle pair of mast profiles, similar to the outer pair of mast profiles, can be positioned above the wheels.
  • FIG. 1 is a schematic top view of a conventional triple mast, in which the limited visibility of an operator 1 has been indicated by sight lines 2.
  • the sight lines 2 represent the visibility range of a conventional forklift mast (not considering a possible additional obstruction by presence of any lift cylinders).
  • a forklift mast includes of several mast guiding parts, these are called mast profiles 3, 4 and 5, each being in pairs to the left and right.
  • the respective left and right outer mast guiding profiles can also be referred to as 3L and 3R.
  • the respective left and right middle mast guiding profiles can also be referred to as 4L and 4R.
  • the respective left and right inner mast guiding profiles can also referred to as 5L and 5R.
  • the pairs of left and right mast guiding profiles are interconnected by upper connecting bridges at the top 6, 7, 8 and by further connecting bridges at the bottom (not illustrated, but generally conventional).
  • An outer upper connecting bridge 6 connects the outer pair of mast profiles 3 of an outer mast part CM1.
  • a middle upper connecting bridge 7 connects the middle pair of mast profiles 4 of a middle mast part CM2.
  • An inner upper connecting bridge 8 connects the inner pair of mast profiles 5 of an inner mast part CM3. Together these form the mast parts CM1, CM2 and CM3, respectively.
  • a complete mast always includes a minimum of two mast parts CM1 and CM2, which slide in and out of each other in order to lift the cargo. Triple-and four part masts are available to lift to higher heights.
  • a triple mast is the most common one and will be described as an example in relation to the accompanying drawings.
  • the invention can also be applied to any other mast type.
  • the various mast parts CM1, CM2 and CM3 slide up and down in each other, driven by two hydraulic lift cylinders or cables (not illustrated but known to the skilled person) which have been positioned to the left and right behind the mast parts CM1, CM2 and CM3.
  • a free lift cylinder 9 may be placed for free lifting. This means that a fork carriage 10 will be lifted without the mast parts CM2 and/or CM3 sliding up.
  • Mast rollers 11 are used to enable mast parts CM1, CM2 and CM3, which contribute to the guiding inside the u-shaped mast profile 3, 4 and 5, to slide in and out.
  • the outer mast part CM1 is mounted to the machine and the inner mast part CM3 carries the fork carriage 10 on which forks 12 are mounted.
  • a middle mast part CM2 can be placed in between the inner and outer mast part.
  • Characteristic of these conventional masts, as indicated in Figure 1 is that all mast profiles 3, 4 and 5 are situated in between the tyres of the forklift truck, that the lengths of the different mast profiles 3, 4, 5 are essentially the same and that these are straight in shape.
  • FIG 2 in a schematic top view shows a triple mast, according to the invention, in which the wider visibility range of the operator 1 is indicated by sight lines 14.
  • a pair of outer mast profiles 15 of an outer mast part CM4 are each positioned above the wheels or tyres, such as the front wheels 16 of the forklift truck.
  • the outer upper connecting bridge 6 interconnects the individual left and right mast guiding profiles (15L and 15R in Figure 3 ) of the outer mast part CM4.
  • FIG 3 is a perspective illustration of a complete three part telescopic mast according to the invention, in which the fork carriage and the fork is partially deleted where it meets with the outer mast part, to better show the shape of the outer mast part at its bottom.
  • the outer mast part CM4 has been narrowed at its bottom, a pair of mast profiles 15 of this outer mast part ends just beneath the mounting 17 for a tilt cylinder.
  • the tilt cylinder mounting 17 is a welded on part for fixation of tilt cylinders (not shown, but conventional).
  • Each right hand and left hand guiding profile 15R, 15L of the mast profiles pair 15 is narrowed at this point to form a kind of supporting frame, constructed from first and second plates 18 and 19, which support the mast profile 15 in such a way that the narrowed supporting frame is situated in between the wheels or tyres of the forklift truck and the mast profiles 15 being arranged on top thereof.
  • the first and second supporting frame plates connect the pair of outer mast guiding profiles 15 to a mast tilting point, for tilting about a front axle of a forklift truck.
  • the mast thereby takes a funnel-like shaped as a result of being wider at its top and narrower at its bottom.
  • the bottom mast rollers 11 have been placed on the mast part which is placed inside CM2, in such a way that these, with a descended mast, stay just above the narrow part of the outer mast CM4 thus resulting in a difference in length of the mast profile (guiding parts) of the outer mast part CM4 and the inner and outer mast parts CM2, CM3 which are situated inwardly thereof.
  • a significant aspect of this mast according to the invention is that the inner mast profiles 4 and/or 5 are situated in between the tyres whilst the outer mast profile 15 has been placed above the tyres, that the length of the different mast profiles 15, 4 and 5 are not equal and that a frontal view of this assembled mast has a funnel shape.
  • the right and left guiding mast profiles 15R, 15L are considerably shorter as these only extend from above the wheels.
  • the including lower narrow part of the outer mast part CM4 is mainly situated in between the wheels, has no guiding function and connects the outer mast profile to the tilting point for the mast at or near a front axle of a forklift truck.
  • Figure 4 is a frontal view of an entire mast mounted to a forklift truck, but with the forks and the fork carriage deleted for clarity.
  • the funnel shape is clearly recognisable as well as the fact that the right hand and left hand mast profiles 15R, 15L are positioned above the wheels 16 and that the guiding mast profiles 15R, 15L does not extend from the bottom.
  • the middle mast part CM2 at its bottom extends beyond the guiding mast profiles 15R, 15L of the outer mast part CM 4 and that the guiding mast profiles 4 of this mast part CM2 is the first guiding part which is situated in between and adjacent to the wheels 16.
  • the outer mast part is narrower at the bottom in between the tyres or wheels and wider at the top above the wheels.
  • the mast profile of the outer mast part CM4 is situated above the funnel construction, the lower narrower part which has no guiding function, is for mounting the mast to the forklift machine at the titling point of its the axle.
  • This part can also be constructed differently, for example by arranging it toward the back (slanted) above the axle, or in the event that the tilting point of the mast would be higher.
  • FIG 5 is a side view of the second mast part CM2.
  • the pair of mast profiles 4 of this mast part CM2 are situated nearest to the wheels (16 in Figure 4 ).
  • Shown clearly in Figure 5 is that the bottom mast roller 11 has been placed at a higher level to engage with the shorter outer mast part profiles (15 in Figure 4 ), which is positioned higher above the wheels (16 in Figure 4 ).
  • This bottom part of the guiding profile 4 mainly serves the purpose of an internal guiding profile for the fork carriage.
  • the invention provides a widened forklift mast with better visibility and relates to an improved construction of the outer mast parts for forklift trucks offering an increased visibility range in or through the mast compared to the conventional constructions.
  • the outer mast profiles are partially or entirely positioned above the wheels or tyres to create a wider opening at the inner mast section.
  • the increased mast opening offers a significantly better view of the forks compared to the conventional forklift mast with comparable lifting and clearance height.
  • the funnel shape is visible. Extra visibility can be obtained by placing the middle mast parts of a three part mast above the front wheels as well. Conventional masts, have up until now, been placed in between the front wheels and go straight up from there, not taking into account the welded on parts.
  • a telescopic mast for a vehicle such as a forklift truck that includes at least an outer mast part (CM4) and an inner mast part (CM3).
  • the outer and inner mast parts are slidable with respect to each other and the outer and inner mast parts (CM4, CM3) are each provided respectively with an outer pair (15) and an inner pair (5) of left and right profile elements (15L, 15R; 5L, 5R).
  • the inner pair (5) of left and right profile elements (5L, 5R) of the inner mast part (CM3) are mounted in between the outer pair (15) of left and right profile elements (15L, 15R) of the outer mast part (CM4).
  • the left and right profile elements (15L, 15R) of the outer pair (15) are shorter in length than the left and right profile elements of the inner pair (5).

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  • 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 (14)

  1. Mât télescopique pour un véhicule comme un engin élévateur à fourche incluant au moins une partie de mât extérieure (CM4) et une partie de mât intérieure (CM3), lesdites parties de mât extérieure et intérieure étant capables de coulisser l'une par rapport à l'autre, dans lequel les parties de mât extérieure et intérieure sont dotées chacune respectivement d'une paire extérieure (15) et d'une paire intérieure (5) d'éléments profilés gauche et droit (15L, 15R ; 5L, 5R), tels que la paire intérieure (5) d'éléments profilés gauche et droit (5L, 5R) de la partie de mât intérieure (CM3) sont montés entre la paire extérieure (15) d'éléments profilés gauche et droit (15L, 15R) de la partie de mât extérieure (CM4), et
    caractérisé en ce que les éléments profilés gauche et droit (15L, 15R) de la paire extérieure (15) sont plus courts en longueur que les éléments profilés gauche et droit (5L, 5R) de la paire intérieure (5).
  2. Mât télescopique selon la revendication 1, dans lequel une partie de mât médiane (CM2) avec une paire médiane (4) d'éléments profilés gauche et droit (4L, 4R) est agencée de manière à pouvoir coulisser dans une position avec les éléments profilés gauche et droit (15L, 15R) de la paire extérieure (15) vers l'extérieur et avec les éléments profilés gauche et droit (5L, 5R) de la paire intérieure (5) vers l'intérieur des éléments profilés gauche et droit (4L, 4R) de la paire médiane (4) de la partie de mât médiane (CM2).
  3. Mât télescopique selon la revendication 2, dans lequel les éléments profilés gauche et droit (4L, 4R) de la paire médiane (4) sont plus courts que les éléments profilés gauche et droit (5L, 5R) de la paire intérieure (5).
  4. Mât télescopique selon la revendication 1, 2 ou 3, incluant en outre un chariot à fourche (10), adapté pour porter au moins une fourche unique (12) ou un accessoire pour porter une charge.
  5. Mât télescopique selon l'une des revendications 1 à 4, dans lequel l'extrémité inférieure de la partie de mât extérieure est adaptée à être attachée à un véhicule, comme un engin élévateur à fourche, de préférence avec l'option d'être basculée par rapport à celui-ci.
  6. Mât télescopique selon l'une des revendications 1 à 4, dans lequel seule la partie inférieure de la partie de mât intérieure (CM3) et non pas l'extrémité inférieure de la partie de mât extérieure est adaptée à être attachée à un véhicule, comme un engin élévateur à fourche.
  7. Mât télescopique selon l'une des revendications 1 à 6, dans lequel les paires individuelles de profilés de mât gauche et droit (5L, 15L ; 5R, 15R) sont de longueurs inégales l'une par rapport à l'autre, et dans lequel une vue frontale du mât assemblé est plus large à son sommet et plus étroite à sa partie basse, et présente de manière inhérente une forme en entonnoir.
  8. Combinaison d'un engin élévateur à fourche et d'un mât télescopique selon l'une des revendications 1 à 7.
  9. Combinaison selon la revendication 8, dans laquelle la paire de profilés de mât intérieur (5) est positionnée entre des roues avant (16) alors que la paire extérieure de profilés de mât gauche et droit (15) est positionnée au-dessus des roues (16), dans laquelle les paires individuelles de profilés de mât gauche et droit (5L, 15L ; 5R, 15R) sont de longueurs inégales, et dans laquelle une vue frontale du mât assemblé présente de manière inhérente une forme en entonnoir, plus large à son sommet et plus étroite à sa partie basse.
  10. Combinaison selon la revendication 9, dans laquelle les profilés de mât gauche et droit (15L, 15R) de chaque extrémité inférieure de la partie de mât extérieure joignent la partie inférieure plus étroite de la construction en entonnoir, et la partie inférieure étroite du profilé de mât extérieure, qui ne présente aucune fonction de guidage, sert ainsi à monter le mât sur l'engin élévateur à fourche et est connectée en pivotement à un point de basculement au niveau d'un essieu avant de l'engin élévateur à fourche.
  11. Combinaison selon la revendication 8, 9 ou 10, dans laquelle les profilés de mât gauche et droit (15L, 15R) sont positionnés soit entièrement soit partiellement au-dessus des roues (16) ou d'organes de convoyage analogues de l'engin élévateur à fourche.
  12. Combinaison selon la revendication 11, dans laquelle la partie inférieure étroite de la partie de mât extérieure (CM4) est montée vers l'arrière, en diagonale au-dessus de l'essieu.
  13. Combinaison selon la revendication 11 ou 12, dans laquelle le point de basculement du mât est plus élevé que la partie inférieure étroite de la partie de mât extérieure.
  14. Combinaison selon l'une des revendications 8 à 13, équipé d'un mât triple ou à parties multiples, dans laquelle la paire médiane des profilés de mât (4) a sensiblement la même longueur que la partie de mât extérieure (CM4), mais est plus courte que les profilés de mât de la partie de mât intérieure (CM3), de sorte que la paire médiane des profilés de mât (4), de manière similaire à la paire extérieure de profilés de mât (15), est positionnée au-dessus des roues (16).
EP10176891A 2009-09-15 2010-09-15 Mât pour chariot élévateur à fourche Not-in-force EP2295366B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL1037284A NL1037284C2 (nl) 2009-09-15 2009-09-15 Heftruck mast.

Publications (2)

Publication Number Publication Date
EP2295366A1 EP2295366A1 (fr) 2011-03-16
EP2295366B1 true EP2295366B1 (fr) 2012-06-06

Family

ID=42102148

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10176891A Not-in-force EP2295366B1 (fr) 2009-09-15 2010-09-15 Mât pour chariot élévateur à fourche

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EP (1) EP2295366B1 (fr)
NL (1) NL1037284C2 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019022681A1 (fr) 2017-07-25 2019-01-31 Boylu Tuna Mât triple de lève-palette à levée libre totale présentant une vue d'opérateur optimisée
WO2019204608A1 (fr) * 2018-04-20 2019-10-24 Jlg Industries, Inc. Plateforme de travail/ de picking logistique élévatrice mobile

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59123096A (ja) 1982-12-28 1984-07-16 グローリー工業株式会社 集中管理警報装置
JPS59123096U (ja) * 1983-02-08 1984-08-18 ティー・シー・エム株式会社 荷役車両の荷役装置
JPS62132099A (ja) 1985-12-04 1987-06-15 Japan Metals & Chem Co Ltd 水素吸蔵合金用容器
JPS62132099U (fr) * 1986-02-08 1987-08-20
US5000293A (en) * 1988-11-03 1991-03-19 Clark Equipment Company Upright for lift truck
US6505710B1 (en) 1997-10-14 2003-01-14 Nissan Motor Co., Ltd. Mast apparatus for fork lift trucks
US7096999B2 (en) * 2003-08-05 2006-08-29 The Raymond Corporation Mast construction for a lift truck

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Publication number Publication date
EP2295366A1 (fr) 2011-03-16
NL1037284C2 (nl) 2011-03-16

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