EP0574615B1 - Telescopic upright for a lift truck - Google Patents
Telescopic upright for a lift truck Download PDFInfo
- Publication number
- EP0574615B1 EP0574615B1 EP19920201755 EP92201755A EP0574615B1 EP 0574615 B1 EP0574615 B1 EP 0574615B1 EP 19920201755 EP19920201755 EP 19920201755 EP 92201755 A EP92201755 A EP 92201755A EP 0574615 B1 EP0574615 B1 EP 0574615B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- upright
- upright section
- movable
- section
- fixed
- 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
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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
- the invention relates to a telescopic upright according to the preamble of claim 1.
- Such an upright is known from WO 82/03215.
- An upright is also known from NL-C-165 992.
- the load carrier is guided relative to the movable upright section by means of rotatable rollers mounted on the load carrier, which rollers can roll over the movable upright section in longitudinal direction.
- a drawback of this known upright is that the guides thereof must be kept greasy so as to prevent corrosion and undue friction. This last in turn entails the drawback that the guides become fouled rapidly, in particular when the lift truck which the upright is a part of is used as an accessory lift truck belonging to a lorry, suspended from the back of the lorry, as is also known from the patent specification referred to. Grease falling off the guides and fouled grease that is left when the grease has been changed constitute a burden on the environment. Further, changing the grease and cleaning the guides is a time-consuming, dirty and unpleasant job.
- the object of the invention is to provide an upright which may be of lighter construction and whose guides become fouled less rapidly.
- both guides are designed as sliding guides with cooperating guide elements made of plastics and of corrosion-resistant metal, they need not be greased. As a consequence, they do not become fouled rapidly, they are simple to clean with water, optionally under high pressure, and a burdening of the environment through grease falling from the guides and fouled grease that is left when the grease has been changed, is avoided.
- a further advantage of the use of plastic sliding guides is that they distribute the force exerted on the upright sections over a larger part of the upright section in question than the known rollers do. Accordingly, the upright sections need to be less resistant to a locally exerted high pressure. This in turn makes it possible to design the upright sections so as to have a slighter wall thickness or to make them of a lighter and softer metal, such as aluminium.
- Figs 1 and 2 are overall views of a lift truck with an upright according to one embodiment of the invention.
- the lift truck comprises a main frame 1, two front wheels 2 and a driven rear wheel 4 to be steered by means of a steering pole 3.
- the upright 6 comprises a fixed upright section 7, an upright section 8 which can be moved relative to the fixed upright section 7 in the longitudinal direction thereof, and a load carrier 10 which is movable relative to the movable upright section 8 in the longitudinal direction thereof.
- the movable upright section 8 and the load carrier 10 are approximately in the lowest position and can be moved telescopically in the direction indicated by an arrow 9.
- the load carrier 10 may be provided with one or more forks 15 mounted on a fork board 16.
- the load carrier can also be of different design, for instance without a separate fork board or with differently shaped forks.
- the upright 6 can be tilted and moved laterally relative to the frame 1.
- two double-acting working cylinders 12 are included between a rail 11 extending across the frame and the upright 6.
- the lift truck comprises a combustion engine 13 for driving a hydraulic pump (not shown) for driving the different working cylinders and a hydromotor (not shown) connected to the wheel 4.
- a combustion engine for driving a hydraulic pump (not shown) for driving the different working cylinders and a hydromotor (not shown) connected to the wheel 4.
- an electric motor can be used instead of a combustion engine.
- the steering pole 3 is fitted with a group of control handles 5 for controlling the vertical displacement of the load carrier 10 as well as the lateral displacement and the tilt in the direction of travel of the upright 6.
- a control panel 14 mounted further on the frame 1 is a control panel 14 with control means for starting and stopping the engine 13.
- Fig. 3 For a further description of the upright, reference is made to Fig. 3, where it is shown in more detail.
- Fig. 3 the forks have been dismounted from the load carrier, so that only the fork board 16 is shown.
- first guide for guiding the movable upright section 8 relative to the fixed upright section 7.
- This first guide comprises plastic sliding shoes 17 and metal slideways 18.
- the metal slideways 18 extend substantially throughout the length of the fixed upright section 7 and the movable upright section 8.
- This second guide comprises plastic sliding shoes 19 and metal slideways 20.
- This second guide does not all sliding shoes and slideways are indicated with reference numerals.
- the upright 6 further comprises means for displacing the movable upright section 8 relative to the fixed upright section 7. These means are designed as a pair of working cylinders 21 which are mounted between a cross beam 22 of the fixed upright section 7 and a bridge member 23 (see Fig. 2) of the movable upright section 8.
- the upright 6 For displacing the load carrier 10 relative to the movable upright section 8, the upright 6 comprises pulleys 24 rotatably mounted on the bridge member 23 at the top of the movable upright section.
- Running over each of the pulleys 24 is a strand 25 (see Fig. 2; not shown in Figs 1 and 3) which, according to the present embodiment, is a chain.
- each strand is connected to a cross beam 26 of the fixed upright section 7 and another end is connected to the load carrier 10.
- the load carrier 10 moves over twice that distance, the movable upright section 8 being guided relative to the fixed upright section 7 and the load carrier 10 being guided relative to the movable upright section 8.
- both guides are designed as sliding guides with cooperating guide elements 17-20 made of plastic and of corrosion-resistant metal, they need not be greased, so that they do not become fouled rapidly and, moreover, can simply be cleaned with water, optionally under high pressure. A burdening of the environment through grease falling off the guides and fouled grease that is left when the grease has been changed, is avoided.
- plastic sliding guides 17 and 19 are used to distribute the force exerted on the upright sections 7 and 8 over a larger part of the upright section in question than the known rollers do. Accordingly, standards 27 and 28 of the upright section 7 and 8 need to be less resistant to a locally exerted high pressure. This in turn enables the standards 27, 28 to be formed with a slighter wall thickness or to be made of a lighter and softer metal, such as aluminium. A slight weight of the upright leads to a lowering of the centre of gravity of the lift truck and hence to improved stability. A slight weight of the lift truck is of particular importance for lift trucks which are taken along with means of transportation, in particular lorries, as well as for lift trucks which are to drive over soft terrain.
- the movable upright section 8 which in the extended position is located at a great height above the ground, is substantially made of aluminium, a considerable lowering of the centre of gravity in the most critical operative position of the lift truck is achieved.
- the fixed upright section 7 substantially of aluminium, because in that way the greatest reduction of the weight of the upright can be achieved.
- Making the upright sections 7 and 8 of aluminium offers a further advantage in that the upright is less sensitive to corrosion. Electrolytic corrosion of the aluminium parts of the upright can be prevented by insulating them from the parts of the lift truck that consist of more precious metals. Such an insulation is for instance obtained when the aluminium parts are connected to the other parts of the lift truck by means of glued joints.
- each sliding guide comprise a stainless steel slideway 18, 20, glued to one of the upright sections 7, 8, respectively, and sliding shoes 17, 19, respectively, which are movable along the slideway.
- the sliding shoes 17, 19, respectively, form relatively compact and cheap parts which can easily be replaced when they are worn.
- the stainless steel slideways 18, 20 are highly wear- and corrosion-resistant and have a life which is at least as long as that of the upright 6 as a whole. Inasmuch as the slideways are glued to the corresponding upright section, they can be narrow without attachment means being located in the paths of the sliding shoes.
- the fixed and the movable upright section 7 and 8 each comprise two standards 27 and 28, respectively, which have an open profile. These standards 27, 28 are arranged so as to have their open sides facing each other, the standards 27, 28 of the fixed and the movable upright sections 7 and 8, respectively, being mutually nested when the upright is in the retracted position.
- the means for moving the movable upright section 8 relative to the fixed upright section 7, which are designed as a pair of working cylinders 21, are each at least partly recessed in one of the standards 28.
- the standards each have a U-shaped profile, while the slideways 18, 20 of corrosion-resistant material are arranged along the flanges and the web of each of the U-shaped sections. Thus, a stable guidance is obtained, with minimal loading of the slideways.
- the standards 27, 28 can also be shaped differently, for instance V-shaped or as sections of a circle.
- the pulleys 24 are positioned obliquely, such that the median planes of the pulleys 24 diverge in the direction of the side of the upright 6 where the load carrier 10 is disposed.
- the ends of the strands 25 that are connected to the load carrier 10 are close to the standards 27, 28 of the upright 6, where they are less obtrusive within the field of vision of the operator of the lift truck than in the case where they extend more centrally.
- Fig. 2 an upright is obtained that affords a proper view through it.
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)
Description
- The invention relates to a telescopic upright according to the preamble of claim 1. Such an upright is known from WO 82/03215.
- An upright is also known from NL-C-165 992. In this known upright, the load carrier is guided relative to the movable upright section by means of rotatable rollers mounted on the load carrier, which rollers can roll over the movable upright section in longitudinal direction.
- A drawback of this known upright is that the guides thereof must be kept greasy so as to prevent corrosion and undue friction. This last in turn entails the drawback that the guides become fouled rapidly, in particular when the lift truck which the upright is a part of is used as an accessory lift truck belonging to a lorry, suspended from the back of the lorry, as is also known from the patent specification referred to. Grease falling off the guides and fouled grease that is left when the grease has been changed constitute a burden on the environment. Further, changing the grease and cleaning the guides is a time-consuming, dirty and unpleasant job.
- The object of the invention is to provide an upright which may be of lighter construction and whose guides become fouled less rapidly.
- This object is realized according to the invention by using the characterizing features according to claim 1 in an upright of the type described in the preamble.
- Inasmuch as in the upright according to the invention both guides are designed as sliding guides with cooperating guide elements made of plastics and of corrosion-resistant metal, they need not be greased. As a consequence, they do not become fouled rapidly, they are simple to clean with water, optionally under high pressure, and a burdening of the environment through grease falling from the guides and fouled grease that is left when the grease has been changed, is avoided.
- A further advantage of the use of plastic sliding guides is that they distribute the force exerted on the upright sections over a larger part of the upright section in question than the known rollers do. Accordingly, the upright sections need to be less resistant to a locally exerted high pressure. This in turn makes it possible to design the upright sections so as to have a slighter wall thickness or to make them of a lighter and softer metal, such as aluminium.
- Hereinafter the invention will be further explained on the basis of a most preferred embodiment, with reference to the accompanying drawings, in which:
- Fig. 1 is a side elevation of a lift truck with an upright according to the invention;
- Fig. 2 is a view of the lift truck shown in Fig. 1 viewed from the operating side; and
- Fig. 3 is a cutaway top plan view of the upright of the lift truck shown in Figs 1 and 2.
- Figs 1 and 2 are overall views of a lift truck with an upright according to one embodiment of the invention. The lift truck comprises a main frame 1, two
front wheels 2 and a drivenrear wheel 4 to be steered by means of asteering pole 3. - Mounted on the frame is an upright 6. The upright 6 comprises a fixed
upright section 7, anupright section 8 which can be moved relative to the fixedupright section 7 in the longitudinal direction thereof, and aload carrier 10 which is movable relative to the movableupright section 8 in the longitudinal direction thereof. In the lift truck shown, the movableupright section 8 and theload carrier 10 are approximately in the lowest position and can be moved telescopically in the direction indicated by an arrow 9. - With the lift truck according to the embodiment shown, the
load carrier 10 may be provided with one ormore forks 15 mounted on afork board 16. Depending on the field of application, the load carrier can also be of different design, for instance without a separate fork board or with differently shaped forks. - The upright 6 can be tilted and moved laterally relative to the frame 1. For varying the tilt of the upright 6, two double-acting working
cylinders 12 are included between arail 11 extending across the frame and the upright 6. - The lift truck comprises a
combustion engine 13 for driving a hydraulic pump (not shown) for driving the different working cylinders and a hydromotor (not shown) connected to thewheel 4. Naturally, instead of a combustion engine, an electric motor can be used. - The
steering pole 3 is fitted with a group ofcontrol handles 5 for controlling the vertical displacement of theload carrier 10 as well as the lateral displacement and the tilt in the direction of travel of the upright 6. Mounted further on the frame 1 is acontrol panel 14 with control means for starting and stopping theengine 13. - For a further description of the upright, reference is made to Fig. 3, where it is shown in more detail. In Fig. 3 the forks have been dismounted from the load carrier, so that only the
fork board 16 is shown. - Arranged between the fixed and the movable
upright sections upright section 8 relative to the fixedupright section 7. This first guide comprises plasticsliding shoes 17 andmetal slideways 18. For the sake of clarity, not all sliding shoes and slideways are indicated by reference numerals. Themetal slideways 18 extend substantially throughout the length of the fixedupright section 7 and the movableupright section 8. Mounted on the fixedupright section 7, adjacent the top end thereof, are slidingshoes 17 which can slide over the associatedslideways 18 mounted on the movableupright section 8. Mounted on the movableupright section 8, adjacent the bottom end thereof, are slidingshoes 17 which can slide over the associatedslideways 18 mounted on the fixedupright section 7. - It is observed that it is also possible, for instance, to use plastic slideways and metal sliding shoes or to provide both upright sections with cooperating slideways extending at least substantially throughout the length thereof, one slideway of any two cooperating slideways being made of plastic while the other is made of metal.
- Mounted between the movable
upright section 8 and theload carrier 10 is a second guide for guiding the load carrier relative to the movableupright section 8. This second guide comprises plasticsliding shoes 19 andmetal slideways 20. For clarity's sake, of this second guide, too, not all sliding shoes and slideways are indicated with reference numerals. - The upright 6 further comprises means for displacing the movable
upright section 8 relative to the fixedupright section 7. These means are designed as a pair of workingcylinders 21 which are mounted between across beam 22 of the fixedupright section 7 and a bridge member 23 (see Fig. 2) of the movableupright section 8. For displacing theload carrier 10 relative to the movableupright section 8, the upright 6 comprisespulleys 24 rotatably mounted on thebridge member 23 at the top of the movable upright section. Running over each of thepulleys 24 is a strand 25 (see Fig. 2; not shown in Figs 1 and 3) which, according to the present embodiment, is a chain. One end of each strand is connected to across beam 26 of the fixedupright section 7 and another end is connected to theload carrier 10. When the movableupright section 8 is displaced over a given distance, theload carrier 10 moves over twice that distance, the movableupright section 8 being guided relative to the fixedupright section 7 and theload carrier 10 being guided relative to the movableupright section 8. - Inasmuch as in the upright 6 according to the invention, both guides are designed as sliding guides with cooperating guide elements 17-20 made of plastic and of corrosion-resistant metal, they need not be greased, so that they do not become fouled rapidly and, moreover, can simply be cleaned with water, optionally under high pressure. A burdening of the environment through grease falling off the guides and fouled grease that is left when the grease has been changed, is avoided.
- A further advantage of the use of plastic
sliding guides upright sections standards upright section standards - Especially if the movable
upright section 8, which in the extended position is located at a great height above the ground, is substantially made of aluminium, a considerable lowering of the centre of gravity in the most critical operative position of the lift truck is achieved. - It is also advantageous, however, to make the fixed
upright section 7 substantially of aluminium, because in that way the greatest reduction of the weight of the upright can be achieved. Making theupright sections - In the upright 6 shown, the guide elements 17-20 of each sliding guide comprise a
stainless steel slideway upright sections shoes sliding shoes stainless steel slideways - The fixed and the
movable upright section standards standards standards upright sections movable upright section 8 relative to the fixedupright section 7, which are designed as a pair of workingcylinders 21, are each at least partly recessed in one of thestandards 28. - As a result, with the
upright 6 according to the embodiment shown, a particularly good view through the standards is provided. This is particularly evident in Fig. 2. This design is made possible owing to the circumstance that the sliding guides of the upright according to the invention can be particularly compact so that within thestandards 28 space can be left for the workingcylinders 21. - The standards each have a U-shaped profile, while the
slideways upright 6 are less high, thestandards - The
pulleys 24 are positioned obliquely, such that the median planes of thepulleys 24 diverge in the direction of the side of theupright 6 where theload carrier 10 is disposed. Thus, the ends of thestrands 25 that are connected to theload carrier 10 are close to thestandards upright 6, where they are less obtrusive within the field of vision of the operator of the lift truck than in the case where they extend more centrally. As appears in particular from Fig. 2, an upright is obtained that affords a proper view through it.
Claims (4)
- A telescopic upright for a lift truck comprising a fixed upright section (7), an upright section (8) movable in the longitudinal direction of the fixed upright section (7), a load carrier (10) movable in the longitudinal direction of the movable upright section (8), a first guide (17, 18) for guiding the movable upright section (8) relative to the fixed upright section (7), a second guide (19, 20) for guiding the load carrier (10) relative to the movable upright section (8), means (21) for displacing the movable upright section (8) relative to the fixed upright section (7) and means (24, 25) for moving the load carrier (10) relative to the movable upright section (8), the first and the second guides being designed as sliding guides, comprising cooperating slideways (18 and 20) and plastic slide shoes (17 and 19, respectively) movable along the slideways, characterized in that the movable upright section (8) and the fixed upright section (7) are each substantially made of aluminium, and the slideways (18 and 20) are each made of stainless steel and glued to one of the aluminium upright sections (7, 8).
- An upright according to claim 1, characterized in that the fixed and the movable upright sections (7, 8) each comprise two standards (27 and 28, respectively) with an open profile whose open sides face each other, the standards (27, 28) of the fixed and the movable upright section (7 and 8, respectively) being nested relative to each other when the upright (6) is in the retracted position and the means for displacing the movable upright section (8) relative to the fixed upright section (7) are designed as a pair of working cylinders (21) which are each at least partly recessed in one of the standards (28).
- An upright according to claim 2, characterized in that the standards (27, 28) each have a U-shaped profile, the tracks (18, 20) made of corrosion-resistant metal being arranged along the flanges and the connecting portion of each of the U-shaped sections.
- An upright according to any one of the preceding claims, characterized in that the means for displacing the load carrier (10) relative to the movable upright section (8) comprise a pair of strands (25) and a pair of pulleys (24) located adjacent the top of the movable upright section (8) and connected to said upright section (8), each of the strands (25) running over one of the pulleys (24) and the centrelines of the pulleys (24) being located obliquely, such that median planes of the pulleys (24) diverge in the direction of the side of the upright (6) where the load carrier (10) is disposed.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP19920201755 EP0574615B1 (en) | 1992-06-15 | 1992-06-15 | Telescopic upright for a lift truck |
DE1992608248 DE69208248T2 (en) | 1992-06-15 | 1992-06-15 | Telescopic mast for a lift truck |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP19920201755 EP0574615B1 (en) | 1992-06-15 | 1992-06-15 | Telescopic upright for a lift truck |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0574615A1 EP0574615A1 (en) | 1993-12-22 |
EP0574615B1 true EP0574615B1 (en) | 1996-02-07 |
Family
ID=8210692
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19920201755 Expired - Lifetime EP0574615B1 (en) | 1992-06-15 | 1992-06-15 | Telescopic upright for a lift truck |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0574615B1 (en) |
DE (1) | DE69208248T2 (en) |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3208556A (en) * | 1962-02-19 | 1965-09-28 | Towmotor Corp | Multiple stage masts for lift trucks |
DE1960674U (en) * | 1967-02-11 | 1967-05-18 | Hans H Meyer O H G | CLAMPING DEVICE FOR FORKLIFT OD. DGL. |
US3961689A (en) * | 1975-04-18 | 1976-06-08 | Towmotor Corporation | Spacer and noise suppressor cushions for lift truck mast units |
WO1982003215A1 (en) * | 1981-03-16 | 1982-09-30 | Johannson Richard J | Adjustable slider bearing assembly |
JPS59500414A (en) * | 1982-03-22 | 1984-03-15 | トウモ−タ− コ−ポレ−シヨン | lift mast assembly |
-
1992
- 1992-06-15 DE DE1992608248 patent/DE69208248T2/en not_active Expired - Fee Related
- 1992-06-15 EP EP19920201755 patent/EP0574615B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE69208248T2 (en) | 1996-07-04 |
EP0574615A1 (en) | 1993-12-22 |
DE69208248D1 (en) | 1996-03-21 |
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