WO2005105657A1 - Gerbeur et fourche de gerbeur - Google Patents

Gerbeur et fourche de gerbeur Download PDF

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Publication number
WO2005105657A1
WO2005105657A1 PCT/NL2005/000322 NL2005000322W WO2005105657A1 WO 2005105657 A1 WO2005105657 A1 WO 2005105657A1 NL 2005000322 W NL2005000322 W NL 2005000322W WO 2005105657 A1 WO2005105657 A1 WO 2005105657A1
Authority
WO
WIPO (PCT)
Prior art keywords
fork
suspension
piston rod
piston
tube
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.)
Ceased
Application number
PCT/NL2005/000322
Other languages
English (en)
Inventor
Sjoerd Meijer
Hendrik Meijer
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of WO2005105657A1 publication Critical patent/WO2005105657A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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 present invention relates to a fork-lift truck and a fork for such a fork-lift truck.
  • a fork of a fork-lift truck comprises a suspension for connecting or connected to a fork beam of the fork-lift truck, and at least one fork carrier.
  • the fork carrier is associated with the suspension and is extendable and retractable relative thereto in a common longitudinal direction.
  • Such a fork can be telescopically extendable and retractable with the suspension.
  • the suspension herein comprises at least one cylinder oriented in the longitudinal direction and having a piston and a piston rod coupled to the fork carrier. This serves to drive the movements of the fork carrier along the suspension. For feed to the cylinder at least one channel runs through the suspension to the cylinder.
  • Oil or another fluid can be carried through the channel to the cylinder.
  • two channels normally run through the suspension to the cylinder to enable provision of a double-action cylinder.
  • four channels run through the suspension to the two cylinders.
  • the production process is adversely affected in terms of cost and possibly also time, while forks with such a construction have the particular drawback that they are voluminous, particularly because of the channels, which must extend along the cylinders through the suspension to be able to realize the double-action function.
  • the present invention has for its object to obviate or at least alleviate the drawbacks of the above mentioned known forks, for which purpose the forks according to the invention, just as a fork-lift truck according to the invention, is distinguished by the feature that a tube connected to the channel is arranged in the cylinder and the piston and the piston rod are hollow and movable round the tube.
  • the function of a channel extending along the cylinder can thus be fulfilled by the tube, which results in space being saved and a simplification of the production process because fewer cylinder holes and channel holes need to be drilled.
  • the space-saving can result in narrower, more elegant forks, and the space that comes available can also be applied and utilized for additional components, measures and features, such as measuring equipment in the fork and so on.
  • Claim 2 thus relates to the feature that the outer end of the tube directed toward the fork carrier is open in order to bring about a connection to the space in the cylinder on the side of the piston rod relative to the piston.
  • the tube does not have to be open per se for this purpose but can also comprise holes or passages.
  • Claim 3 relates to the feature that the tube extends substantially over the full length of the cylinder. The range of movement of the piston rod in the cylinder can thus be maximized.
  • Claim 4 relates to the measure that the piston is arranged sealingly and the piston rod with clearance round the tube.
  • Claim 5 subsequently relates to the measure that the piston rod comprises a passage between the spaces in and around the piston rod. Oil can thus be carried from the tube through the hollow piston rod into the space in the cylinder around the piston rod. This will normally correspond with retraction of the fork.
  • the passage in the piston rod is arranged in close proximity to the piston.
  • a maximum range of movement of the fork carrier is also provided herewith. This is associated with a maximum stroke of the cylinder without leakage of oil or other fluid.
  • Claims 7 relates to the measure that the channel comprises two parts, of which a first part is connected to the tube and a second part is connected to the space in the cylinder opposite the piston rod relative to the piston.
  • the two-part channel preferably comprises two concentric channel parts, which also results in a considerable space-saving.
  • the two-part channel can comprise separate channel parts which are arranged adjacently of each other and which then each lead to one of at least two substantially synchronous cylinders arranged adjacently of each other, wherein the at least two cylinders are connected close to the outer ends thereof. It is thus not necessary to drill four channels, two channels for each of the at least two cylinders, through the suspension, which in turn produces a further simplification.
  • the present invention also relates to a fork-lift truck with all per se known elements, such as a displaceable frame, a mast on the frame, a carriage movable along the mast and a fork beam on the carriage, but also having at least one fork according to the present invention on the fork beam.
  • the present invention will be further elucidated hereinbelow on the basis of a description of a number of embodiments shown in the drawings, wherein the same or similar components are designated with the same reference numerals, and in which: fig. 1 is a perspective view of a fork-lift truck according to the present invention; fig. 2 is a perspective, exploded view of a fork of a fork-lift truck of fig.
  • fig. 3 is a cut-away perspective view of a suspension of a fork according to the present invention
  • fig. 4 and fig. 5 each show a detail of the view of fig . 3
  • fig. 6A and fig. 6B show different operating positions in a cut-away or cross-sectional view of the fork according to fig. 2, 3, 4 and 5
  • fig. 7 is a perspective, cut-away view of a fork in an alternative embodiment of the present invention
  • fig. 8 and fig. 9 each show a view of a detail of the embodiment of a fork according to the invention shown in fig. 7
  • fig. 10A and fig. 10B each show an operating position of the fork of fig.
  • Fig. 1 shows a fork-lift truck 1.
  • the fork-lift truck comprises a displaceable frame 2 having a mast 3 thereon.
  • a carriage 4 is displaceable along mast 3 and a fork beam 5 is arranged on carriage 4.
  • Fork beam 5 thus moves up and downward with carriage 4 along mast 3.
  • each of the forks 6 comprises a suspension 7 and a fork carrier 8.
  • Fork carrier 8 is an extendable and retractable component which fits over the part 9 of suspension 7 which extends substantially in horizontal direction.
  • the part 10 of suspension 7 which extends substantially in upward direction can be coupled or is fixed to fork beam 5 by means of fixing means (not further shown) .
  • the channels run through the upward extending part 10 to the parts 9 extending substantially in horizontal direction, in which in the embodiment shown here two cylinders are arranged, as will be described below in more detail.
  • FIG. 3 shows a perspective view in cross-section of suspension 7, wherein channels 12 are drilled in the upward part 10 and wider cylinders 13 are drilled in horizontal part 9.
  • a combination of a piston rod 14 with a piston 15 is placed in the left-hand cylinder 13 and the drilled hole forming the left-hand cylinder 13 is closed with a plug 16.
  • the right-hand cylinder 13 is also closed with a plug 16, but piston rod 17 is hollow and a tube 18 is placed therein which runs through piston 19, wherein piston 19 connects sealingly to tube 18, while piston rod 17 fits round the tube with clearance.
  • Tube 18 is further connected to the right-hand channel 12 in the upward part 10 of suspension 7.
  • the left-hand cylinder 13 is connected directly onto the left-hand channel 12.
  • suspension 7-10 show an alternative embodiment, in particular of a suspension 7 of a fork 6 according to the present invention.
  • suspension 7 comprises a single cylinder 13 which in general and in detail is the same as cylinder 13 of fig. 3-6 with the hollow piston rod 17 therein.
  • tube 18 is extended into channel 12, as shown most clearly in fig. 9.
  • a concentric embodiment of a two-part channel is thus provided, wherein tube 18 forms part of this two-part configuration of channel 12. Because tube 18 extends in a drilled hole 25, which is a single drilled hole 25, this is a concentric, two-part construction of channel 12.
  • a T-shaped coupling piece 26 is arranged on the top side of the upward extending part 10 of suspension 7.
  • This coupling piece 26 has two inlets 27 and 28 which are connected, each with a separate valve (not shown) , for introducing oil under pressure therethrough through either drilled hole 25 or tube 18.
  • the view of fig. 8 is not essentially different from the view of fig. 4 in respect of the cylinder 13 with the hollow piston rod 17 therein.
  • the difference between fig. 4 and 8 lies in the presence of respectively two cylinders and one cylinder.
  • the operation of the configuration shown in fig. 7- 9 is represented schematically in fig. 10A and fig. 10B. When oil is forced under pressure through tube 18, as shown in fig. 10A, it enters the interior of hollow piston rod 17.
  • the hollow piston rod 17 in turn forms a unit with piston 19 via a coupling piece 24, along which the oil can flow out of the interior of hollow piston rod 17 to the space in the cylinder 13 therearound so as to exert a pressure on piston 19 and thus bring about a movement in the direction of arrow A. If, on the other hand, oil under pressure passes through the channel 12 formed by a drilled hole 25, around tube 18, piston 19 will then be pressed in the other direction of arrow B so as to extend piston rod 17.
  • the tube 18 applied in each case does not have to be open at the end thereof, but can also comprise radially oriented passages.
  • the fork carrier 8 is shown in fig. 2 as a telescopically slidable component which fits round the substantially horizontally oriented part 9 of the suspension 7. In an alternative embodiment the fork carrier 8 can also be slidable along this part 9.
  • Channels 12 and cylinders 13 are formed substantially as drilled holes, but alternative embodiments thereof are likewise possible. Laser techniques and other methods can for instance be used to realize the desired passages, channels and cylinder holes.

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)
  • Fluid-Damping Devices (AREA)

Abstract

L'invention porte sur une fourche (6) de gerbeur comportant une suspension (7) se fixant aux traverses élévatrices (5) du gerbeur et au moins une dent (8) de fourche solidaire de la suspension et extensible et rétractable longitudinalement. La dent (8) comporte au moins un vérin (13) longitudinal, un piston (19) et une tige (17) de piston et au moins une conduite (12) d'alimentation du vérin traversant la suspension (7). Un tube (18) relié au conduit (12) est disposé dans le vérin (13) et la tige (17) de piston est creuse et mobile autour du tube (18).
PCT/NL2005/000322 2004-04-29 2005-04-28 Gerbeur et fourche de gerbeur Ceased WO2005105657A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1026092A NL1026092C2 (nl) 2004-04-29 2004-04-29 Vorkheftruck en vork daarvoor.
NL1026092 2004-04-29

Publications (1)

Publication Number Publication Date
WO2005105657A1 true WO2005105657A1 (fr) 2005-11-10

Family

ID=34967357

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NL2005/000322 Ceased WO2005105657A1 (fr) 2004-04-29 2005-04-28 Gerbeur et fourche de gerbeur

Country Status (2)

Country Link
NL (1) NL1026092C2 (fr)
WO (1) WO2005105657A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202016003279U1 (de) 2016-05-21 2016-06-23 Durwen Maschinenbau Gmbh Verstellbare lastaufnehmende Vorrichtung für Flurförderzeuge, insbesondere Gabelstapler

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB902898A (en) * 1957-11-21 1962-08-09 C Coupler & Engineering Co Ltd Improvements in or relating to pallet trucks
GB1246525A (en) * 1969-09-09 1971-09-15 Hunslet Holdings Ltd Load lifting forks
US4294572A (en) * 1978-04-10 1981-10-13 Pattison Jack E Internal fluid communication system for power cylinders
US4498837A (en) * 1980-02-19 1985-02-12 Selectiebedrijf Kooi Beheer B.V. Fork lifter comprising a slidable fork
DE8118843U1 (de) * 1981-06-27 1990-06-07 Kaup GmbH & Co KG Gesellschaft für Maschinenbau, 63741 Aschaffenburg Gabelstapler
US5573366A (en) * 1992-03-30 1996-11-12 Meijer; Sjoerd Hydraulic device with synchronously operating jacks
GB2313590A (en) * 1996-05-31 1997-12-03 Moffett Res & Dev Ltd Extendable fork for forklift trucks
DE29823710U1 (de) * 1998-05-08 1999-09-23 Schwiers, Willi, 57234 Wilnsdorf Anbaugerät für Flurförderfahrzeuge, wie Stapler o.dgl.
NL1012574C1 (nl) * 1999-07-12 2001-01-15 Parosha Holding B V Hefvork voor een vorkheftruck.

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB902898A (en) * 1957-11-21 1962-08-09 C Coupler & Engineering Co Ltd Improvements in or relating to pallet trucks
GB1246525A (en) * 1969-09-09 1971-09-15 Hunslet Holdings Ltd Load lifting forks
US4294572A (en) * 1978-04-10 1981-10-13 Pattison Jack E Internal fluid communication system for power cylinders
US4498837A (en) * 1980-02-19 1985-02-12 Selectiebedrijf Kooi Beheer B.V. Fork lifter comprising a slidable fork
DE8118843U1 (de) * 1981-06-27 1990-06-07 Kaup GmbH & Co KG Gesellschaft für Maschinenbau, 63741 Aschaffenburg Gabelstapler
US5573366A (en) * 1992-03-30 1996-11-12 Meijer; Sjoerd Hydraulic device with synchronously operating jacks
GB2313590A (en) * 1996-05-31 1997-12-03 Moffett Res & Dev Ltd Extendable fork for forklift trucks
DE29823710U1 (de) * 1998-05-08 1999-09-23 Schwiers, Willi, 57234 Wilnsdorf Anbaugerät für Flurförderfahrzeuge, wie Stapler o.dgl.
NL1012574C1 (nl) * 1999-07-12 2001-01-15 Parosha Holding B V Hefvork voor een vorkheftruck.

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202016003279U1 (de) 2016-05-21 2016-06-23 Durwen Maschinenbau Gmbh Verstellbare lastaufnehmende Vorrichtung für Flurförderzeuge, insbesondere Gabelstapler
DE102017004737A1 (de) 2016-05-21 2017-11-23 Durwen Maschinenbau Gmbh Verstellbare lastaufnehmende Vorrichtung für Flurförderzeuge, insbesondere Gabelstapler
DE102017004737B4 (de) 2016-05-21 2024-09-19 Durwen Maschinenbau Gmbh Verstellbare lastaufnehmende Vorrichtung für Flurförderzeuge, insbesondere Gabelstapler

Also Published As

Publication number Publication date
NL1026092C2 (nl) 2005-11-01

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