GB2387376A - Lifting mast for an industrial truck - Google Patents

Lifting mast for an industrial truck Download PDF

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Publication number
GB2387376A
GB2387376A GB0208306A GB0208306A GB2387376A GB 2387376 A GB2387376 A GB 2387376A GB 0208306 A GB0208306 A GB 0208306A GB 0208306 A GB0208306 A GB 0208306A GB 2387376 A GB2387376 A GB 2387376A
Authority
GB
United Kingdom
Prior art keywords
mast
lifting
extending
fixed
industrial truck
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.)
Granted
Application number
GB0208306A
Other versions
GB2387376B (en
GB0208306D0 (en
Inventor
Barry Michael Warner
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.)
Linde Material Handling UK Ltd
Original Assignee
Lansing Linde Ltd
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 Lansing Linde Ltd filed Critical Lansing Linde Ltd
Priority to GB0208306A priority Critical patent/GB2387376B/en
Publication of GB0208306D0 publication Critical patent/GB0208306D0/en
Priority to DE2003112247 priority patent/DE10312247A1/en
Publication of GB2387376A publication Critical patent/GB2387376A/en
Application granted granted Critical
Publication of GB2387376B publication Critical patent/GB2387376B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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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

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)

Abstract

A lifting mast for an industrial truck, preferably for a reach truck, has a fixed mast (12) and at least one extending mast (13, 14). The at least one extending mast (13, 14) can be raised relative to the fixed mast (12) by means of the force of at least one lifting cylinder (17, 20). At least one lifting cylinder (17), as viewed in the longitudinal direction of the industrial truck, is arranged within the extent of the fixed mast (12), on the side of the extending mast (13, 14) facing away from the load. In the case of the conventional design of a lifting mast, the latter has a fixed mast (12), a first extending mast (13) and a second extending mast (14). At least one lifting cylinder (20), as viewed in the longitudinal direction of the industrial truck, is then located within the extent of the first extending mast, on the side of the fixed mast facing the load. Preferably, the operating cylinder and/or a power or hydraulic line or chain are confined within both the width and length of the fixed part. Preferably, the moving part(s) of the mast are provided on the outside of the fixed mast to provide better vision for the operator. Preferably, the fixed and first moving mast parts have a longitudinal extent at least twice the diameter of guide rollers.

Description

Liftino mast for an industrial truck The invention relates to a lifting
mast for an industrial truck, preferably for a reach truck, having a fixed mast and at least one extending mast, it being possible for the at 5 least one extending mast to be raised relative to the fixed mast by means of the force of at least one lifting cylinder. The invention also relates to an industrial truck, preferably a reach truck, having a lifting mast of the above kind.
An industrial truck generally has a right-hand and a left-hand lifting mast, which 10 together form a lifting frame. In this case, each lifting mast has a stationary fixed mast.
The vertical movement of the extending masts of the two lifting masts is always carried out synchronously, which is ensured by a mechanical connection between the extending masts. Each lifting mast is equipped with at least one, but normally with two extending masts. Industrial trucks of an extremely wide range of types, for example 15 counter- balanced fork-lift trucks, reach-type fork-lift trucks, reach trucks or high-lift trucks are equipped with lifting frames of this type. A load lifting means can be raised along the lifting frames. In the case of reach trucks, there is additionally the possibility of displacing the load lifting means in the horizontal direction relative to the lifting frame. The lifting frame itself, on the other hand, is then fixed in the horizontal direction 20 to a frame of the industrial truck.
The document GB 2 331 054 A discloses an industrial truck in which the lifting masts of a lifting frame are arranged in the immediate vicinity of a driver position of the industrial truck, the lifting masts being spaced apart from each other in the transverse 25 direction of the industrial truck, so that the width of the lifting frame corresponds to the width of the industrial truck.
An object of the invention is to provide a lifting mast for an industrial truck which is optimised for the application in the above-described industrial truck and, with the 30 lowest possible hindrance to the view of the driver, has a high rigidity.
According to the invention, at least one lifting cylinder, as viewed in the longitudinal direction of the industrial truck, is arranged within the extent of the fixed mast, on the side of the extending mast facing away from the load. The lifting'cylinder is therefore
located beside the profile of the fixed mast and, as viewed from the driver position of the industrial truck, in front of the extending mast. This arrangement results in an integrated and therefore space-saving design, in particular a low width of the lifting mast, so that the field of view of the driver is hardly restricted at all by the lifting frame.
This advantage is reinforced by a development of the invention, according to which the lifting mast has a fixed mast, a first extending mast and a second extending mast, at least one lifting cylinder, as viewed in the longitudinal direction of the industrial truck, being arranged within the extent of the first extending mast, on the side of the fixed 10 mast facing the load. This second lifting cylinder is therefore arranged beside the first extending mast and, as viewed from the driver position, behind the fixed mast.
As viewed in the transverse direction of the industrial truck, the fixed mast is arranged on the inside of the lifting mast. The extending masts are therefore located on the 15 outsides of the lifting frame. This has the effect that no movable parts of the lifting frame of the industrial truck are accessible from the driver position. Access to these parts is prevented by the appropriately shaped fixed masts.
A more compact design results if at least one lifting cylinder is arranged within the 20 extent of the width of the fixed mast. The lifting cylinders, as viewed in the transverse direction of the industrial truck, therefore do not project beyond the width of the fixed mast. The advantages with regard to a compact design and therefore a good view for the 25 driver are reinforced if at least one lifting chain and/or at least one hydraulic or electric line, as viewed in the longitudinal direction of the industrial truck, is arranged within the extent of the fixed mast, on the side of the extending mast facing away from the load.
The aforementioned components are therefore located in the area of the first lifting cylinder, beside the fixed mast and on the driver-position side of at least one extending 30 mast.
Furthermore, it is advantageous if at least one lifting chain and/or at least one hydraulic or electric line is arranged within the extent of the width of the fixed mast.
35 Particular rigidity of the lifting mast is achieved if an extending mast is guided on the fixed mast by means of guide rollers such that it can be moved in the vertical direction, and if the extent of the fixed mast in the longitudinal direction of the industrial truck is
at least 2.0 times the diameter of the guide rollers. This achieves high flexural rigidity with respect to a torque loading about a transverse axis of the industrial truck.
The same advantage results if the second extending mast is guided on the first 5 extending mast by means of guide rollers such that it can be moved in the vertical direction, and if the extent of the first extending mast in the longitudinal direction of the industrial truck is at least 2. 0 times the diameter of the guide rollers.
A lifting carriage is provided, which is guided on the outside of the extending mast such 10 that it can be displaced in the vertical direction. This is necessitated by the present arrangement, in which the fixed mast is arranged on the inside and the extending mast on the outside of the lifting frame.
In addition, a reach carriage may be provided, which is guided on the outside of the 15 lifting carriage such that it can be displaced in the substantially horizontal direction.
The reach carriage with a load lifting means fixed to it can therefore be displaced relative to the lifting carriage in the longitudinal direction of the industrial truck.
In this case, the reach carriage is designed in such a way that the end of the reach 20 carriage facing away from the load, as viewed in the longitudinal direction of the industrial truck, is located in front of that end of the fixed mast which faces away from the load, in every position of the reach carriage. The reach carriage therefore does not project beyond the fixed mast in the direction of the driver position in any operating situation. Further advantages and details of the invention will be explained in more detail using the exemplary embodiments illustrated in the accompanying schematic drawings, in which: 30 Figure 1 shows a reach truck with lifting masts according to the invention in plan view, Figure 2 shows a lifting mast according to the invention in cross section.
Figure 1 shows a reach truck with a lifting frame having two lifting masts 1 according to 35 the invention. It is possible to see a driver position 2, which is located above a drive wheel 3 and a battery block 4 and extends into the space between the lifting masts 1.
Also illustrated is a driver's seat 5 and a driver 6 seated on it. On the outsides of the
lifting masts 1, a lifting carriage 7 is guided such that it can be displaced in the vertical direction. Relative to the lifting carriage 7, a reach carriage 8 can be displaced in the substantially horizontal direction, on which reach carriage 8 the load lifting means 9 is fixed, designed as a load fork. Rigidly connected to the lifting masts 1 are two wheel 5 arms 10, which extend underneath the reach carriage 8 in the direction of the load and on which in each case a wheel 11 (or two wheels arranged in tandem) which can be braked is mounted.
In Figure 2, the lifting mast 1 depicted at the bottom in Figure 1 is illustrated in detail. It 10 is possible to see the fixed mast 12, a first extending mast 13 and a second extending mast 14. The first extending mast 13 is guided on the fixed mast by guide rollers 15, and the second extending mast 14 is guided on the first extending mast 13 by guide rollers 16. The lifting carriage 7 in turn is guided on the second extending mast 14 by guide rollers 22 such that it can move in the vertical direction.
According to the invention, a first lifting cylinder 17 is located within the extent a of the fixed mast 12 in the longitudinal direction of the reach truck and on that side of both extending masts 13, 14 which faces away from the load. The first lifting cylinder 17 is connected to the lifting carriage 7 via a first lifting chain 18 and can lift the lifting 20 carriage 7 relative to the extending masts 13, 14 when the latter are lowered. Also connected to the first lifting cylinder 17 are hydraulic and electric lines 19. A first lifting cylinder 17, likewise the first lifting chain 18 and the lines 19, are arranged in a space saving manner within the outer contours of the lifting mast.
25 According to the invention, a second lifting cylinder 20 is located within the extent b of the first extending mast 13 in the longitudinal direction of the reach truck and on the load side of the fixed mast 12. The second lifting cylinder 20 raises the first extending mast 13 relative to the fixed mast 12. A second lifting chain 21 then effects the raising of the second extending mast 14 relative to the first extending mast 13.
As compared with a conventional lifting mast, in which the longitudinal extent of the fixed mast and the extending masts is substantially dimensioned in accordance with the diameters of the guide rollers, the present fixed mast 12 and the present first extending mast 13 have large extents a, b in the longitudinal direction of the industrial 35 truck. This imparts great rigidity to the lifting mast in the loading direction which occurs during the operation of the reach truck. The arrangement of the second lifting cylinder 20 on the load side of the fixed mast 12 is additionally suitable to produce a counter
torque acting on the fixed mast 12, counteracting elastic deflection on account of the weight of a raised load.

Claims (15)

Claims:
1. Lifting mast for an industrial truck, having a fixed mast and at least one extending mast, it being possible for the at least one extending mast to be raised relative to the fixed mast by means of the force of at least one lifting cylinder, wherein at 5 least one lifting cylinder, as viewed in the longitudinal direction of the industrial truck, is arranged within the extent of the fixed mast, on the side of the extending mast facing away from the load.
2. Lifting mast according to Claim 1, wherein the lifting mast has a fixed mast, a first 10 extending mast and a second extending mast, at least one lifting cylinder, as viewed in the longitudinal direction of the industrial truck, being arranged within the extent of the first extending mast, on the side of the fixed mast facing the load.
3. Lifting mast according to Claim 1 or Claim 2, wherein the fixed mast, as viewed in 15 the transverse direction of the industrial truck, is arranged on the inside of the lifting mast.
4. Lifting mast according to Claims 1 to 3, wherein at least one lifting cylinder is arranged within the extent of the width of the fixed mast.
5. Lifting mast according to any one of Claims 1 to 4, wherein at least one lifting chain and/or at least one hydraulic or electric line, as viewed in the longitudinal direction of the industrial truck, is arranged within the extent of the fixed mast, on the side of the extending mast facing away from the load.
6. Lifting mast according to any one of Claims 1 to 5, wherein at least one lifting chain and/or at least one hydraulic or electric line is arranged within the extent of the width of the fixed mast.
30
7. Lifting mast according to any one of Claims 1 to 6, wherein an extending mast is guided on the fixed mast by means of guide rollers such that it can be moved in the vertical direction, and in that the extent of the fixed mast in the longitudinal direction of the industrial truck is at least 2.0 times the diameter of the guide rollers.
8. Lifting mast according to Claim 2 or any one of Claims 3 to 7 when dependent on Claim 2, wherein the second extending mast is guided on the first extending mast by means of guide rollers such that it can be moved in the vertical direction, and in that the extent of the first extending mast in the longitudinal direction of the 5 industrial truck is at least 2.0 times the diameter of the guide rollers.
9. Lifting mast according to any one of Claims 1 to 8, wherein a lifting carriage is provided, which is guided on the outside of the extending mast such that it can be displaced in the vertical direction.
10. Lifting mast according to Claim 9, wherein a reach carriage is provided, which is guided on the outside of the lifting carriage such that it can be displaced in the substantially horizontal direction.
15
11. Lifting mast according to Claim 10, wherein the reach carriage is designed in such a way that the end of the reach carriage which faces away from the load, as viewed in the longitudinal direction of the industrial truck, is located in front of that end of the fixed mast which faces away from the load, in every position of the reach carriage.
12. Lifting mast for an industrial truck substantially as hereinbefore described with reference to and as shown in the accompanying drawings.
13. Industrial truck having a lifting mast according to any one of Claims 1 to 12.
14. Industrial truck according to Claim 13, wherein the industrial truck is a reach truck.
15. Industrial truck substantially as hereinbefore described with reference to and as 30 shown in the accompanying drawings.
GB0208306A 2002-04-10 2002-04-10 Industrial trucks having lifting masts Expired - Fee Related GB2387376B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB0208306A GB2387376B (en) 2002-04-10 2002-04-10 Industrial trucks having lifting masts
DE2003112247 DE10312247A1 (en) 2002-04-10 2003-03-19 Lift mast for a reach truck

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0208306A GB2387376B (en) 2002-04-10 2002-04-10 Industrial trucks having lifting masts

Publications (3)

Publication Number Publication Date
GB0208306D0 GB0208306D0 (en) 2002-05-22
GB2387376A true GB2387376A (en) 2003-10-15
GB2387376B GB2387376B (en) 2005-12-21

Family

ID=9934625

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0208306A Expired - Fee Related GB2387376B (en) 2002-04-10 2002-04-10 Industrial trucks having lifting masts

Country Status (2)

Country Link
DE (1) DE10312247A1 (en)
GB (1) GB2387376B (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB972352A (en) * 1962-01-19 1964-10-14 Gen Engineering Company Aktieb Improvements in or relating to lift trucks
GB2016409A (en) * 1978-03-20 1979-09-26 Jungheinrich Kg Hoisting structure for hoisting equipment
WO1983003406A1 (en) * 1982-03-22 1983-10-13 Macnab, John, E. Lift mast assembly
GB2199302A (en) * 1986-12-22 1988-07-06 Carelift Equipment Limited Telescopic mast assembly
EP0283637A1 (en) * 1987-03-13 1988-09-28 ELECAR S.p.A. Mast for fork lifts having the lifting cylinders located inside the lateral shapes
JPH08282987A (en) * 1995-04-10 1996-10-29 Nippon Yusoki Co Ltd Lift cylinder supporting structure for cargo handling vehicle

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI111626B (en) * 2001-10-19 2003-08-29 Rocla Oyj Reach truck

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB972352A (en) * 1962-01-19 1964-10-14 Gen Engineering Company Aktieb Improvements in or relating to lift trucks
GB2016409A (en) * 1978-03-20 1979-09-26 Jungheinrich Kg Hoisting structure for hoisting equipment
WO1983003406A1 (en) * 1982-03-22 1983-10-13 Macnab, John, E. Lift mast assembly
GB2199302A (en) * 1986-12-22 1988-07-06 Carelift Equipment Limited Telescopic mast assembly
EP0283637A1 (en) * 1987-03-13 1988-09-28 ELECAR S.p.A. Mast for fork lifts having the lifting cylinders located inside the lateral shapes
JPH08282987A (en) * 1995-04-10 1996-10-29 Nippon Yusoki Co Ltd Lift cylinder supporting structure for cargo handling vehicle

Also Published As

Publication number Publication date
DE10312247A1 (en) 2003-12-04
GB2387376B (en) 2005-12-21
GB0208306D0 (en) 2002-05-22

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20160410