WO1993023326A1 - Forklift truck - Google Patents

Forklift truck Download PDF

Info

Publication number
WO1993023326A1
WO1993023326A1 PCT/EP1993/001207 EP9301207W WO9323326A1 WO 1993023326 A1 WO1993023326 A1 WO 1993023326A1 EP 9301207 W EP9301207 W EP 9301207W WO 9323326 A1 WO9323326 A1 WO 9323326A1
Authority
WO
WIPO (PCT)
Prior art keywords
forklift truck
chassis
truck
tubular members
forklift
Prior art date
Application number
PCT/EP1993/001207
Other languages
French (fr)
Inventor
Frederick George Wilson
Original Assignee
Frederick George Wilson
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 Frederick George Wilson filed Critical Frederick George Wilson
Publication of WO1993023326A1 publication Critical patent/WO1993023326A1/en

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
    • B66F9/08—Masts; Guides; Chains
    • B66F9/10—Masts; Guides; Chains movable in a horizontal direction relative to truck
    • 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
    • B66F9/07563—Fork-lift trucks adapted to be carried by transport vehicles

Definitions

  • This invention relates to a forklift truck, particularly of a type suitable for carrying on trucks or trailers.
  • Demountable forklift trucks are well known, being widely used in delivery of building materials and farm produce.
  • the forklift mast is mounted on horizontally opposed channels with rollers.
  • the mast When lifting a load the mast is extended forwardly to provide the maximum counterbalance.
  • the mast When the load is raised the mast is retracted over and above the wheels for travelling.
  • a forklift truck comprising front and rear chassis sections connected together by at least three tubular members which can slide telescopically within one another to vary the overall length of the chassis.
  • the invention has the advantage that the overall length of the chassis may be contracted to a minimum when it is desired to carry the forklift on another vehicle, yet extended to a maximum to provide stability when carrying a load. Further, -the telescopic construction is relatively simple and may be manufactured at relatively low cost, yet provides a forklift of light weight relative to its lifting capacity.
  • Figure 1 shows a first embodiment of forklift truck with a three-part telescopic connection between front and rear chassis sections, in its extended position
  • Figure 2 shows the truck of figure 1 in its closed position
  • Figure 3 shows the hydraulic mechanism associated with the telescopic connection of figures 1 and 2 .
  • Figure 4 is a side view, partially in cross-section, of a second embodiment of forklift truck in its extended position
  • Figure 5 shows the truck of figure 4 in its closed position and ready to be raised to a transport position on a carrying vehicle
  • Figure 7 shows brackets welded or bolted to the underrun guard of a carrying vehicle
  • Figure 8 shows the forklift truck of figure 5 in an elevated position for transport.
  • a forklift truck has front and rear chassis sections 10 and 11 respectively.
  • the front section 10 includes front road wheels 12, a lift mast 13 and forks 14, and the rear section 11 includes steerable wheels 15 and, inside a rear cover 16, the equipment such as engine or batteries to power the forklift.
  • the front and rear chassis sections 10 and 11 are coupled together by a telescopic connection 17 consisting of three steel tubes 18, 19 and 20, the tube 18 being connected to the front chassis section 10 and the tube 20 being connected to the rear chassis section 11.
  • the tubes 18 to 20 are of rectangular, square or other substantially constant cross-section and can slide within one another in the manner of telescopic rings to vary the overall length of the chassis.
  • the telescopic connection 17 is extended and contracted by two double acting hydraulic rams 21 and 22.
  • the cylinder 23 of each hydraulic ram is fixed to the centre tube 19, while the piston rod 24 of one ram is fixed to the tube 18 and the piston rod 24a of the other ram is fixed to the tube 20.
  • the full bore sides of the rams are connected by pipes 25 and the annular sides of the rams are connected by pipes 26 so that the rams extend and contract together.
  • the rams are operated by the hydraulic system of the forklift truck, and by extending the piston rods 24 and 24a the overall length of the forklift truck chassis can be extended to provide a long wheelbase for stability when working, figure 1. By retracting the piston rods 24 and 24a the front and rear chassis sections can be closed up to reduce the overall length and hence the wheelbase of the forklift truck for storage or carrying on a vehicle, figure 2.
  • FIGS 4 and 5 show a second embodiment of forklift truck according to the invention in its extended and closed positions respectively.
  • the same reference numerals have been used as in figures 1 to 3 for like parts.
  • the principle difference from the first embodiment is in the arrangement of the hydraulic rams.
  • the cylinders 23 of the rams are fixed to the front and rear tubes 18 and 20 respectively, while the piston rods 24 and 24a are fixed to the centre tube 19.
  • the hydraulic rams are maintained under pressure by a pilot valve or by an accumulator in the hydraulic pipe system.
  • the maximum extension of the tubes 18 to 20 is defined by stops 27a and 27b welded on the internal surfaces of the tubes 18 and 19 respectively which come to abut against stops 28a and 28b welded on the external surfaces of the tubes 19 and 20.
  • stops 27a and 27b welded on the internal surfaces of the tubes 18 and 19 respectively which come to abut against stops 28a and 28b welded on the external surfaces of the tubes 19 and 20.
  • the use of a three-part telescopic connection as shown permits the overall length of the chassis to be extended from its closed
  • the tubes 18 to 20 are a relatively loose fit within one another so that when they are fully extended they form a slight arch as shown in figure 4. In this position, when a load is carried on the forks 14, the left hand ends (as viewed in figure 4) of the tubes 19 and 20 become frictionally jammed inside the right hand ends of the tubes 18 and 19, forming a very rigid chassis. Further, the greater the load the greater the tension on the upper surfaces of the tubes 18 to 20, increasing the rigidity of the chassis.
  • the forklift truck has a seat 30 and steering wheel 31 which can be swung up out of the way in order to permit the forklift truck to be closed.
  • the mast 13 of the forklift truck, figure 6 has a fixed section 32 and an upwardly slidable section 33.
  • Upper and lower pulleys 34 and 35 respectively are mounted at the top and bottom of the slidable section 33.
  • the forks 14 are mounted on an upwardly slidable fork carrier in the form of a plate 36 having a shallow T-shaped cross-section with upper and lower flanges 37 and 38 engaging the forks 14.
  • a first chain 39' is connected at its lower end to the plate 36 and at its upper end to the fixed mast section 32 and passes round the upper pulley 34.
  • a second chain 39' ' is connected at its upper end to the fixed mast section 32 and at its lower end to the plate 36 and passes around the lower pulley 35.
  • a double acting hydraulic ram 40 is connected between the fixed and slidable sections 32 and 33 of the mast.
  • the ram 40 is operated by the hydraulic system of the forklift truck, and when it is extended the slidable mast section 33 is raised and when it is contracted the slidable mast section 33 is lowered. Raising or lowering of the mast section 33 causes the fork carrier 36 to move twice as far in the same direction.
  • the forklift truck may be mounted on the rear of a vehicle such as a truck or trailer using the fitment shown in figure 7, in which the horizontal bars 4.1 and 42 represent the cross-bars of an underrun guard commonly fitted at the rear of trucks, trailers and other commercial high-bottom vehicles.
  • a pair of U-shaped brackets 43 are welded or bolted at laterally spaced positions to the lower bar 42, and a further bracket 44 is mounted on the upper bar 41 centrally between the brackets 43.
  • the bracket 44 is rotatable about a horizontal axis A normal to the bar 41 and comprises a tongue 45 and an eccentric cam 46 welded together for co-rotation.
  • the bracket 44 When one wishes to mount the forklift truck on the rear of a truck or other vehicle, the bracket 44 is first rotated until the tongue 45 and cam 46 are pointing upwards, as indicated by dashed lines in figure 7. Then the forklift truck is driven slowly towards the rear of the truck and by manipulation of the height of the mast 13 and the position of the forklift truck the flange 38 of the plate 36 is eased into the U-shaped brackets 43. Now the bracket 44 is rotated 180 degrees to the position shown in solid lines in figure 7, whereupon the cam 46 engages and pushes down on the edge of the upper flange 37 of the plate 36 to force the lower flange 38 properly down into engagement with the brackets 43. At the same time the tongue 45 engages behind the flange 37. Now the bracket 44 is rotated 180 degrees to the position shown in solid lines in figure 7, whereupon the cam 46 engages and pushes down on the edge of the upper flange 37 of the plate 36 to force the lower flange 38 properly down into engagement with the brackets 43.

Abstract

A forklift truck comprises front and rear chassis sections (10, 11) telescopically connected together by at least three tubular members (18, 19, 20) which can slide within one another to vary the overall length of the chassis.

Description

FORKLIFT TRUCK
This invention relates to a forklift truck, particularly of a type suitable for carrying on trucks or trailers.
Demountable forklift trucks are well known, being widely used in delivery of building materials and farm produce.
Generally the forklift mast is mounted on horizontally opposed channels with rollers. When lifting a load the mast is extended forwardly to provide the maximum counterbalance. When the load is raised the mast is retracted over and above the wheels for travelling. There are a number of disadvantages in this type of construction.
First, it is complex and therefore expensive. Secondly, it is of considerable weight and thirdly, because of the fixed length chassis, expensive modifications are required to the rear of the carrying vehicle so that at least part of the forklift is within the vehicle body length when travelling.
It is an object of the invention to provide a construction of forklift truck which mitigates at least some of these disadvantages.
SUBSTITUTE SHEET According to the present invention there is provided a forklift truck comprising front and rear chassis sections connected together by at least three tubular members which can slide telescopically within one another to vary the overall length of the chassis.
The invention has the advantage that the overall length of the chassis may be contracted to a minimum when it is desired to carry the forklift on another vehicle, yet extended to a maximum to provide stability when carrying a load. Further, -the telescopic construction is relatively simple and may be manufactured at relatively low cost, yet provides a forklift of light weight relative to its lifting capacity.
Embodiments of the invention will now be described, by way of example, with reference to the accompanying drawings, in which:
Figure 1 shows a first embodiment of forklift truck with a three-part telescopic connection between front and rear chassis sections, in its extended position,
Figure 2 shows the truck of figure 1 in its closed position,
Figure 3 shows the hydraulic mechanism associated with the telescopic connection of figures 1 and 2 ,
Figure 4 is a side view, partially in cross-section, of a second embodiment of forklift truck in its extended position,
Figure 5 shows the truck of figure 4 in its closed position and ready to be raised to a transport position on a carrying vehicle,
SUBSTITUTE SHEET Figure 6 shows the mechanical construction of the mast of the forklift truck of figure 4,
Figure 7 shows brackets welded or bolted to the underrun guard of a carrying vehicle, and
Figure 8 shows the forklift truck of figure 5 in an elevated position for transport.
Referring first to figures 1 and 2, a forklift truck has front and rear chassis sections 10 and 11 respectively. The front section 10 includes front road wheels 12, a lift mast 13 and forks 14, and the rear section 11 includes steerable wheels 15 and, inside a rear cover 16, the equipment such as engine or batteries to power the forklift.
The front and rear chassis sections 10 and 11 are coupled together by a telescopic connection 17 consisting of three steel tubes 18, 19 and 20, the tube 18 being connected to the front chassis section 10 and the tube 20 being connected to the rear chassis section 11. The tubes 18 to 20 are of rectangular, square or other substantially constant cross-section and can slide within one another in the manner of telescopic rings to vary the overall length of the chassis.
As shown in figure 3, the telescopic connection 17 is extended and contracted by two double acting hydraulic rams 21 and 22. The cylinder 23 of each hydraulic ram is fixed to the centre tube 19, while the piston rod 24 of one ram is fixed to the tube 18 and the piston rod 24a of the other ram is fixed to the tube 20. The full bore sides of the rams are connected by pipes 25 and the annular sides of the rams are connected by pipes 26 so that the rams extend and contract together.
SUBSTITUTE SHEET The rams are operated by the hydraulic system of the forklift truck, and by extending the piston rods 24 and 24a the overall length of the forklift truck chassis can be extended to provide a long wheelbase for stability when working, figure 1. By retracting the piston rods 24 and 24a the front and rear chassis sections can be closed up to reduce the overall length and hence the wheelbase of the forklift truck for storage or carrying on a vehicle, figure 2.
Figures 4 and 5 show a second embodiment of forklift truck according to the invention in its extended and closed positions respectively. In these figures the same reference numerals have been used as in figures 1 to 3 for like parts.
The principle difference from the first embodiment is in the arrangement of the hydraulic rams. In this embodiment the cylinders 23 of the rams are fixed to the front and rear tubes 18 and 20 respectively, while the piston rods 24 and 24a are fixed to the centre tube 19. As before the full bore sides of the rams and the annular sides of the rams are connected by pipes so that the rams extend and contract together. The hydraulic rams are maintained under pressure by a pilot valve or by an accumulator in the hydraulic pipe system.
The maximum extension of the tubes 18 to 20 is defined by stops 27a and 27b welded on the internal surfaces of the tubes 18 and 19 respectively which come to abut against stops 28a and 28b welded on the external surfaces of the tubes 19 and 20. Typically, allowing for the necessary overlap of the tubes 18 to 20 in the extended position, the use of a three-part telescopic connection as shown permits the overall length of the chassis to be extended from its closed
SUBSTITUTE SHEET position by one and a half times the length of the front tube 18.
The tubes 18 to 20 are a relatively loose fit within one another so that when they are fully extended they form a slight arch as shown in figure 4. In this position, when a load is carried on the forks 14, the left hand ends (as viewed in figure 4) of the tubes 19 and 20 become frictionally jammed inside the right hand ends of the tubes 18 and 19, forming a very rigid chassis. Further, the greater the load the greater the tension on the upper surfaces of the tubes 18 to 20, increasing the rigidity of the chassis.
As seen in figures 4 and 5, the forklift truck has a seat 30 and steering wheel 31 which can be swung up out of the way in order to permit the forklift truck to be closed.
The mast 13 of the forklift truck, figure 6 has a fixed section 32 and an upwardly slidable section 33. Upper and lower pulleys 34 and 35 respectively are mounted at the top and bottom of the slidable section 33. The forks 14 are mounted on an upwardly slidable fork carrier in the form of a plate 36 having a shallow T-shaped cross-section with upper and lower flanges 37 and 38 engaging the forks 14. A first chain 39' is connected at its lower end to the plate 36 and at its upper end to the fixed mast section 32 and passes round the upper pulley 34. A second chain 39' ' is connected at its upper end to the fixed mast section 32 and at its lower end to the plate 36 and passes around the lower pulley 35. A double acting hydraulic ram 40 is connected between the fixed and slidable sections 32 and 33 of the mast.
SUBSTITUTE SHEET The ram 40 is operated by the hydraulic system of the forklift truck, and when it is extended the slidable mast section 33 is raised and when it is contracted the slidable mast section 33 is lowered. Raising or lowering of the mast section 33 causes the fork carrier 36 to move twice as far in the same direction.
The forklift truck may be mounted on the rear of a vehicle such as a truck or trailer using the fitment shown in figure 7, in which the horizontal bars 4.1 and 42 represent the cross-bars of an underrun guard commonly fitted at the rear of trucks, trailers and other commercial high-bottom vehicles. A pair of U-shaped brackets 43 are welded or bolted at laterally spaced positions to the lower bar 42, and a further bracket 44 is mounted on the upper bar 41 centrally between the brackets 43. The bracket 44 is rotatable about a horizontal axis A normal to the bar 41 and comprises a tongue 45 and an eccentric cam 46 welded together for co-rotation.
When one wishes to mount the forklift truck on the rear of a truck or other vehicle, the bracket 44 is first rotated until the tongue 45 and cam 46 are pointing upwards, as indicated by dashed lines in figure 7. Then the forklift truck is driven slowly towards the rear of the truck and by manipulation of the height of the mast 13 and the position of the forklift truck the flange 38 of the plate 36 is eased into the U-shaped brackets 43. Now the bracket 44 is rotated 180 degrees to the position shown in solid lines in figure 7, whereupon the cam 46 engages and pushes down on the edge of the upper flange 37 of the plate 36 to force the lower flange 38 properly down into engagement with the brackets 43. At the same time the tongue 45 engages behind the flange 37. Now the
SUBSTITUTE SHEET forklift truck is locked onto the rear underrun guard, which is the position shown in figure 5.
Now, by attempting to lower the sliding section 33 of the mast 13, the forklift truck is raised off the ground into a position for transport, as shown in figure 8.
SUBSTITUTE SHEET

Claims

CLAIMS :
1. A. forklift truck comprising front and rear chassis sections connected together by at least three tubular members which can slide telescopically within one another to vary the overall length of the chassis.
2. A forklift truck as claimed in claim 1, wherein the tubular members fit loosely within one another such that when the chassis is fully extended the tubular members form an arch.
3. A forklift truck as claimed in claim 1 or 2, further including a hydraulic mechanism comprising at least one double acting hydraulic ram for extending and contracting the chassis.
4. A forklift truck as claimed in claim 3, wherein the truck has only three tubular members and the hydraulic mechanism comprises a first hydraulic cylinder connected between the front and middle tubular members and a second hydraulic cylinder connected between the middle and rear tubular member.
SUBSTITUTE SHEET
PCT/EP1993/001207 1992-05-14 1993-05-13 Forklift truck WO1993023326A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB929210384A GB9210384D0 (en) 1992-05-14 1992-05-14 Demountable fork lift truck for road vehicles
GB9210384.5 1992-05-14

Publications (1)

Publication Number Publication Date
WO1993023326A1 true WO1993023326A1 (en) 1993-11-25

Family

ID=10715515

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1993/001207 WO1993023326A1 (en) 1992-05-14 1993-05-13 Forklift truck

Country Status (3)

Country Link
AU (1) AU4068493A (en)
GB (1) GB9210384D0 (en)
WO (1) WO1993023326A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102815643A (en) * 2012-09-10 2012-12-12 朱红蔚 Lorry-mounted cargo loading and unloading operation device
CN109704237A (en) * 2019-01-16 2019-05-03 安徽宇锋智能科技有限公司 A kind of AGV traction forklift with intelligent decision identification perceptional function
WO2024074624A1 (en) * 2022-10-05 2024-04-11 Jungheinrich Aktiengesellschaft Reach truck

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE528055A (en) *
US2996206A (en) * 1953-08-12 1961-08-15 Otis Elevator Co Vehicular loader
DE1907750A1 (en) * 1968-04-18 1969-11-06 Ernst Wagner Appbau Lifting and conveying vehicle with adjustable wheel length
FR2090093A1 (en) * 1970-05-16 1972-01-14 Fork Lift Truck Patente
US3710965A (en) * 1970-12-21 1973-01-16 J Joosten Material handling vehicle and method of storing same
DE2249622A1 (en) * 1971-10-11 1973-04-19 John Robson Shipley CHARGING DEVICE
US3933218A (en) * 1973-10-11 1976-01-20 Ab Bofors Container handling truck
AU8652275A (en) * 1974-11-11 1977-05-19 Hill L D Fork lift truck
US4033625A (en) * 1975-03-28 1977-07-05 Fikse Tyman H Adjustable-length semitrailer chassis and method of semitrailer maneuvering
NL8005192A (en) * 1980-09-17 1982-04-16 Kooi Bv Forklift truck transportable on lorry - has chassis in two parts movable together into transport position

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE528055A (en) *
US2996206A (en) * 1953-08-12 1961-08-15 Otis Elevator Co Vehicular loader
DE1907750A1 (en) * 1968-04-18 1969-11-06 Ernst Wagner Appbau Lifting and conveying vehicle with adjustable wheel length
FR2090093A1 (en) * 1970-05-16 1972-01-14 Fork Lift Truck Patente
US3710965A (en) * 1970-12-21 1973-01-16 J Joosten Material handling vehicle and method of storing same
DE2249622A1 (en) * 1971-10-11 1973-04-19 John Robson Shipley CHARGING DEVICE
US3933218A (en) * 1973-10-11 1976-01-20 Ab Bofors Container handling truck
AU8652275A (en) * 1974-11-11 1977-05-19 Hill L D Fork lift truck
US4033625A (en) * 1975-03-28 1977-07-05 Fikse Tyman H Adjustable-length semitrailer chassis and method of semitrailer maneuvering
NL8005192A (en) * 1980-09-17 1982-04-16 Kooi Bv Forklift truck transportable on lorry - has chassis in two parts movable together into transport position

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102815643A (en) * 2012-09-10 2012-12-12 朱红蔚 Lorry-mounted cargo loading and unloading operation device
CN102815643B (en) * 2012-09-10 2016-01-20 朱红蔚 Vehicle mounted type handling goods implement
CN109704237A (en) * 2019-01-16 2019-05-03 安徽宇锋智能科技有限公司 A kind of AGV traction forklift with intelligent decision identification perceptional function
CN109704237B (en) * 2019-01-16 2020-09-04 安徽宇锋智能科技有限公司 AGV pulls fork truck with intelligence is judged discernment perception function
WO2024074624A1 (en) * 2022-10-05 2024-04-11 Jungheinrich Aktiengesellschaft Reach truck

Also Published As

Publication number Publication date
AU4068493A (en) 1993-12-13
GB9210384D0 (en) 1992-07-01

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