US3565273A - Lift truck construction - Google Patents

Lift truck construction Download PDF

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Publication number
US3565273A
US3565273A US810549A US3565273DA US3565273A US 3565273 A US3565273 A US 3565273A US 810549 A US810549 A US 810549A US 3565273D A US3565273D A US 3565273DA US 3565273 A US3565273 A US 3565273A
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US
United States
Prior art keywords
chassis
carrier
load
mast
piston
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Expired - Lifetime
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US810549A
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English (en)
Inventor
Erich Hahn
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ERNST WAGNER APPARATEBAV
Original Assignee
Wagner Appbau Ernst
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Publication of US3565273A publication Critical patent/US3565273A/en
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    • 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

Definitions

  • a lift truck includes a wheeled vehicle having divided longitudinal frames which may be extended or retracted for adjusting the longitudinal spacing between the front and rear wheels.
  • a forklift carried by the vehicle is arranged to actuate a sensing device such as a dynamometer to measure the load to be lifted and the dynamometer is connected to a system to actuate means for shifting the divided frame elements carrying the wheels for the purpose of extending or retracting the wheel chassis in accordance with the value of the load to be lifted.
  • a sensing device such as a dynamometer to measure the load to be lifted
  • the dynamometer is connected to a system to actuate means for shifting the divided frame elements carrying the wheels for the purpose of extending or retracting the wheel chassis in accordance with the value of the load to be lifted.
  • a truck construction which includes an adjustable wheelbase which can be used in practice without any difiiculties because it includes a dynamometer between the load carrier and the treads of the vehicle wheels which can be employed for determining the size of a load to be lifted.
  • the driver can readily determine whether the load moment corresponds to the respective wheelbase setting by observing the dynamometer and he may increase the wheelbase .setting if necessary.
  • the tipping dangers which were inherent in vehicles of this nature is eliminated.
  • the dynamometer is designed as a hydraulic cylinder having a movable piston andthe hydraulic cylinder is connected through a line to an indicator arranged in the drivers cabin.
  • the dynamometer can also be arranged, for example, between the chassis and the wheel axles.
  • the dynamometer is arranged on the tilting device itself. For example, it can be connected between the tilting device and the mast at the center of gravity of the tilting device on the chassis.
  • the hydraulic cylinder for tilting the mast is designed as a dynamometer.
  • the dynamometer is connected to an operating mechanism or switching device for changing the wheelbase in accordance with the load which is sensed and this eliminates any possible errors of judgement by the driver.
  • the switching mechanism is advantageottsly arranged so that the dynamometer will prevent the lifting of a load at a certain load moment when the wheel base does not correspond to the load moment sensed or when the maximum admissible load moment is exceeded. In this way, it is possible to adapt the wheelbase automatically to the ioacl to be lifted.
  • several switching devices which act on mechanism to move the wheelbase elements sense the position of the relatively shiftable wheel frame portions and provide a corresponding extension or retraction of these portions in accordance with the load requirements.
  • locking devices are provided which act on. one or several of the switching devices in dependence on the orientation of the adjustable parts of the wheelbase.
  • cam strips or similar devices designed as blocking elements are arranged on one of the mutually displa'ccable chassis parts and they cooperate with the movable switching devices arranged on the other part, for example, at a location perpendicularly to the longitudinal axis of the truck. Depending on the position in which the cam strips or other devices are located relative to the respective switching devices, there will either be a release or a blocking of the switching devices.
  • the switching devices are advantageously designed as electrohydraulic switches having a hydraulic part which is connected with the dynamometer and having an electrical part which is connected into the circuit of one or several drives for shifting the relatively movable parts of the chassis.
  • damping elements particularly chokes, are provided in the hydraulic feedlines.
  • the electrohydraulic switches are preferably connected with several switches of which at least one is inserted into the circuit of the wheelbase drive for shifting the relatively movable parts of the wheelbase in order to achieve the automatic adjustment of the wheelbase to the desired wheel spacmg.
  • a forklift truck having an adjustable wheelbase and which includes dynamometer means for sensing a loadtp be lifted for the purpose of determining the spacing between the front and rear wheels for adequately supporting and lifting a given load.
  • a further object of the invention is to provide a forklift truck which includes a forklift portion which advantageously actuates dynamometer means, in accordance with the size of the load being lifted, to determine the load size; the dynamometer means being, for example, a hydraulic drive for tilting the support mast or frame of the truck load carrier.
  • a further object of the invention is to provide a forklift truck which is simple in design, rugged in construction, and economical to manufacture.
  • the invention embodied therein comprises a forklift truck having a chassis frame 1 over which is mounted a driver's seat and motor enclosure 2.
  • the chassis frame 1 includes side frame members 4 and S, which may be adjusted relative to each other in a longitudinal direction and which are arranged on each side of the chassis frame.
  • the chassis frame 1 may be elongated or contracted in the directions of the double arrow 3 in order to vary the spacing between the front wheel set 8 and the rear wheel set 9.
  • the side frame member 4 advantageously carries the main drive motor below the drivers seat and it is shifted on the frame 4 either toward or away from the lifting element or carrier 10 at the front of the vehicle for the purposes of providing a counter load of a size sufficient to overcome the weight of the load being lifted.
  • the shifting of the side frame members 4 and 5 relative to each other is accomplished by means of a hydraulic piston and cylinder combination com prising a cylinder 6 having a piston 7 slidable therein which are connected between the two parts 4 and 5 to provide for the shifting thereof and the adjustment of the spacing between the forward wheels 8 and the rear wheels 9.
  • the forklift truck includes a mast or lifting frame 11 having the carrier 10 associated therewith which advantageously may be raised and lowered thereon.
  • the mast 11 can be tilted by means of a hydraulic cylinder 12 having a piston 13 slidable therein which is connected between the chassis and the lower end of the mast 11 to permit it to pivot about its pivotal mounting 16.
  • the cylinder '12 is designed as a dynamometer and when the carrier engages the load and the mast 11 is tilted to engage the carrier to lift the load, the amount of the load can be readily determined by the lifting force which is required.
  • the dynamometer cylinder is provided with the usual hydraulic feed and discharge lines (not shown) and it is connected by a line 35 as indicated in FIG. 2 to a plurality of electrohydraulic switches generally designated 14 which are arranged at spaced locations along the length of one of the frame members, for example, the frame member 4.
  • a load 15 bearing on the load carrier 10, as represented by broken lines if FIG. 1, will produce a moment of rotation about the mast 11 and its supporting pivotal mounting 16 which will be manifest in a corresponding pressure in the hydraulic cylinder 12.
  • the pressure which is sensed can be used to determine the value of the load 15 and can also be used to actuate the electrohydraulic switches 14 or an indicator (not shown) which is located adjacent the drivers seat 2.
  • the position shown in solid lines in FIG. 1 is retracted state of the chassis and the dotted line position shows the maximum extended state.
  • the extended state is assumed when a particularly heavy load is to be raised.
  • the switches 14 include electrical portions or contact elements 18 which are connected to an electrical circuit 19 which is provided for the control of the operation of the lifting and driving cylinder 12.
  • Each switch 14 also includes corresponding piston and cylinder arrangements 21, 22 and 23 which are set for response at different load movements.
  • the switch cylinder 21 closer to the rear axle responds to a lower load moment and the following switches 22 and 23 are set to the next higher values progressively.
  • the switch 21 responds, its electrical part opens to affect the control circuit 19 which is connected to the lifting cylinder 12 and the driving cylinder 6.
  • the switch 21 is prevented from responding by a strip or cam 24 which is carried on the frame part5 and moves with the frame part 5 relatively to the frame part 4 of the chassis.
  • the movement of the electrohydraulic switch on which the strip 24 bears is blocked so that the electrical part 18 cannot close the circuit 19 to effect a further drive of the cylinder 6 to either extent or retract the frame parts 4 and 5.
  • hydraulic switches 14' are provided which correspond to the switches 14 but which include a reversing switch portion engageable in a cir cuit 26 in series with the circuit 19' which is adapted to be connected to actuate mechanism for the lifting cylinder 12 and the driving cylinder 6. If the load is too low for one of the electrohydraulic switches 14 to respond, the latter will remain in the represented bottom position so that the lifting and driving drive to the respective cylinders 12 and 16 is connected and the wheel drive receives its voltage. As soon as one of the switches is actuated, the circuit 19' of the lifting and driving drive is stopped and the wheelbase drive is connected.
  • the chassis part 5 thus is displaced relative to the part 4 and the strip 24 is correspondingly displaced in respect to the switches 14 back to an original position so that the increase of the wheelbase is completed and the lifting and driving drive is connected again.
  • an additional electrohydraulic switch 27 is provided at a location at which it will not cooperate with the locking strip 24 and which releases when a maximum load moment is attained which prevents the lifting and driving of the truck.
  • a choke l7. is connected in the line 35 to the switches 14' to prevent actuation by impacts or collision shocks, for example.
  • a load dependent blocking device for the circuit closer of the wheelbase drive (which is not represented).
  • a gearshift lever shaft 28 of the drive carries a shift lever 29 and it is provided with a locking cam 30 which is adapted to cooperate with a plunger 31 of a hydraulic switching device 32.
  • the hydraulic switching device 32 is connected to the pressure line 35 which is connected to the cylinder 12, and it responds only at a pressure corresponding to a certain load moment.
  • the gearshift lever 29 can only be moved in one direction, that is, in the direction of the arrow 33. The opposite direction 34 is blocked.
  • FIG. 4 operates similar to the embodiments of FIGS. 2 and 3 and several switching devices 32 are arranged along the length of one of the movable frame parts. Each switching device includes a locking cam 30 of a different length.
  • a lifting device comprising a wheeled chassis frame having an extensible and retractable side frame for changing the wheelbase length, a carrier supported on said chassis and being movable to lift a load, shifting means connected to said side frame for extending and retracting said frame to vary the wheelbase length, and dynamometer means connected to said carrier for actuation thereby in accordance with the load moment acting on said carrier and connected to said shifting means to extend and to retract said frame in accordance with the load movement acting on said carrier.
  • a lifting device including a carrier mast pivotally mounted on said chassis for pivotal movement about a substantially horizontal axis and extending upwardly from said chassis, said lift carrier being supported on said mast, hydraulic piston and cylinder means carried on said chassis and connected to said mast for pivoting said mast to effect lifting of said carrier with a load thereon, said dynamometer means comprising said hydraulic piston and cylinder means.
  • a lifting device according to claim 2, wherein said dynamometer means includes switching means connected to said fluid piston and cylinder and being responsive to the pressure in said fluid cylinder to actuate means for moving said extensible and retractable side frame for changing the wheelbase length.
  • said wheel chassis includes a front wheel set having a wheel axis and a rear wheel having a rear wheel axis, said dynamometer means being arranged between said chassis and said front and rear wheel axes.
  • a lifting device according to claim 1, wherein said dynamometer means comprises a fluid pressure cylinder, and a piston slidable in said cylinder connected to said carrier.
  • a lifting device including means associated with said dynamometer means for indicating the load which is engaged by said carrier.
  • a lifting device comprising a wheeled chassis having front and rear wheels and two chassis portions carrying respective ones of said front and rear wheels which are extensibly and retractably movable in relation to one another for changing the wheelbase length, a mast pivotally mounted on and extending upwardly from said chassis, said mast being pivotal about a substantially horizontal axis, a lift carrier supported on said mast and extending outwardly therefrom, and being movable to lift a load, a first fluid cylinder and piston combination connected between said chassis and said mast for pivoting said mast and shifting said carrier therewith for engaging and lifting a load and for lowering and disengaging a load, a second fluid piston and cylinder combination carried on said chassis and connected to said relatively movable chassis portions for shifting them relatively to change the wheelbase length, and dynamometer means connected to said carrier for measuring the load moment acting on said carrier and being connected to actuate said second fluid piston and cylinder combination for extending and retracting said two chassis portions in accordance with the load moment on said carrier.
  • said dynamometer means comprises said first fluid cylinder and piston combination, a driving circuit for controlling the movement of said movable frame by actuating said second fluid cylinder and piston combination, and a plurality of switches connected in said operating circuit and being responsive to the pressure in said first fluid cylinderjand-piston combination as determined by the load engaged by said carrier to actuate said drive circuit by separate and distinct proportional amounts.
  • a lifting device comprising a wheeled chassis having front and rear wheels and two chassis portions carrying respective ones of said front and rear wheels which are extensibly and retractably movable in relation to one another for changing the wheelbase length, a mast pivotally mounted on and extending upwardly from said chassis, saidmast being pivotal about a substantially horizontal axis, a lift carrier supported on said mast and extending outwardly therefrom, and being movable to lift a load, a first fluid cylinder and piston combination connected between said chassis and said mast for pivoting said mast and shifting said carrier therewith for engaging and lifting a load and for lowering and disengaging a load, a second fluid piston and cylinder combination carried on said chassis and connected to said relatively movable chassis portions for shifting them relatively to change the wheelbase length, dynamometer means connected to said carrier for measuring the load moment acting on said carrier, said dynamometer means comprising said first fluid cylinder and piston combination, a driving circuit for controlling the movement of said movable frame by actuating said second fluid cylinder and piston combination and
  • a lifting device comprising a wheeled chassis having front and rear wheels and two chassis portions carrying respective ones of said front and rear wheels which are extensibly and retractably movable in relationto one another for changing the wheelbase length, a mast pivotally mounted on and extending upwardly from said chassis, said mast being pivotal about a substantially horizontal axis, a lift carrier supported on said mast and extending outwardly therefrom, and being movable to lift a load, a first fluid cylinder and piston combination connected between said chassis and said mast for pivoting said mast and shifting said carrier therewith for engaging and lifting a load and for lowering and disengaging a load, a second fluid piston and cylinder combination on said chassis and connected to said relatively movable chassis portions for shifting them relatively to change the wheelbase length, dynamometer means connected to said carrier for measuring the load moment acting on said carrier, said dynamometer means comprising said first fluid cylinder and piston combination, a driving circuit for controlling the movement of said movable frame by actuating said second fluid cylinder and piston combination, and
  • a lifting device according to claim 10, wherein said electrical switch portions of said switches includes a reversing circuit for effecting a reversing movement of said movable frame relative to said other frame.
  • said dynamometer means includes a plurality of electrohydraulic switches adapted to be connected to said first fluid cylinder and piston combination for operating said first fluid cylinder and piston combination and damping means associated with said switches.
  • a lifting device comprising a wheeled chassis having front and rear wheels and two chassis portions carrying respective ones of said front and rear wheels which are extensibly and retractably movable in relation to one another for changing the wheelbase length, a mast pivotally mounted on and extending upwardly from said chassis, said mast being pivotal about a substantially horizontal axis, a lift carrier supported on said mast and extending outwardly therefrom, and being movable to lift a load, a first fluid cylinder and piston combination connected between said chassis and said mast for pivoting said mast and shifting said carrier therewith for engaging and lifting a load and for lowering and disengaging a load, a second fluid piston and cylinder combination carried on said chassis and connected to said relatively movable chassis portions for shifting them relatively to change the wheelbase length, dynamometer means connected to said carrier for measuring the load moment acting on said carrier, said dynamometer means including a hydraulic switch connected to said first fluid cylinder and piston combination and being movable in accordance with the pressure in said first fluid cylinder and piston combination as determined by

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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)
  • Vehicle Body Suspensions (AREA)
  • Invalid Beds And Related Equipment (AREA)
US810549A 1968-04-18 1969-03-26 Lift truck construction Expired - Lifetime US3565273A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT378868A AT285439B (de) 1968-04-18 1968-04-18 Hub- und Förderfahrzeug mit verstellbarem Radstand

Publications (1)

Publication Number Publication Date
US3565273A true US3565273A (en) 1971-02-23

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US810549A Expired - Lifetime US3565273A (en) 1968-04-18 1969-03-26 Lift truck construction

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US (1) US3565273A (de)
AT (1) AT285439B (de)
DE (1) DE1907750C3 (de)
FR (1) FR2006412A1 (de)
GB (1) GB1239148A (de)
NL (1) NL6902812A (de)
SE (1) SE345645B (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3703969A (en) * 1971-06-21 1972-11-28 Towmotor Corp Process of placing a head in a space with a lift truck
US4132317A (en) * 1977-04-12 1979-01-02 Spetsialnoe Konstruktorskoe Bjuro Gazstroimashina Pipe laying crane
US4690610A (en) * 1986-04-24 1987-09-01 Caterpillar Industrial Inc. Lift mast transport arrangement
US5788452A (en) * 1997-07-14 1998-08-04 Gerardus J. Brouwer Forklift vehicle
US6065556A (en) * 1994-08-30 2000-05-23 Van William Concepts Pty. Ltd. Variable wheel base vehicle
US20090038186A1 (en) * 2007-08-06 2009-02-12 Extendquip, Llc Extendable frame work vehicle
US20090206589A1 (en) * 2007-08-06 2009-08-20 Extendquip, Llc Extendable frame work vehicle having lift member movable in a true vertical fashion
CN103204447A (zh) * 2013-04-03 2013-07-17 同济大学 蜂窝式液压顶推装置
US20150151952A1 (en) * 2012-05-31 2015-06-04 Ponsse Oyj Stabilizing of forest work unit

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9210384D0 (en) * 1992-05-14 1992-07-01 Wilson Frederick G Demountable fork lift truck for road vehicles
GB2356624B (en) * 1999-10-30 2004-04-14 Jungheinrich Ag Fork-lift truck
DE10004622B4 (de) * 1999-10-30 2005-05-12 Jungheinrich Ag Gegengewichtstapler
DE10327478A1 (de) * 2003-06-18 2005-02-03 Deere & Company, Moline Selbstfahrende Erntemaschine
DE102007046868B9 (de) * 2007-09-28 2023-08-31 Universität Stuttgart Transportvorrichtung für Ladungsträger und Verfahren zu deren Steuerung
DE102013000259B4 (de) * 2013-01-10 2020-09-10 Sew-Eurodrive Gmbh & Co Kg Fahrzeug

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2320601A (en) * 1943-01-20 1943-06-01 Roy C Howell Industrial truck
GB751269A (en) * 1953-04-29 1956-06-27 Th Pernin & Fils Improvements in or relating to mechanical handling trucks
US2767394A (en) * 1954-04-08 1956-10-16 Emmanuel Kaye Tipping moment indicator for lifting trucks
FR1148019A (fr) * 1956-02-03 1957-12-03 Châssis de roulement servant de support d'engins mécaniques pour le terrassement et le transport
US2851171A (en) * 1955-07-25 1958-09-09 Jourdan Concrete Pipe Co Material handling apparatus
US2916172A (en) * 1958-06-13 1959-12-08 Burton H Locke Fork lift truck with shiftable ballast

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2320601A (en) * 1943-01-20 1943-06-01 Roy C Howell Industrial truck
GB751269A (en) * 1953-04-29 1956-06-27 Th Pernin & Fils Improvements in or relating to mechanical handling trucks
US2767394A (en) * 1954-04-08 1956-10-16 Emmanuel Kaye Tipping moment indicator for lifting trucks
US2851171A (en) * 1955-07-25 1958-09-09 Jourdan Concrete Pipe Co Material handling apparatus
FR1148019A (fr) * 1956-02-03 1957-12-03 Châssis de roulement servant de support d'engins mécaniques pour le terrassement et le transport
US2916172A (en) * 1958-06-13 1959-12-08 Burton H Locke Fork lift truck with shiftable ballast

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3703969A (en) * 1971-06-21 1972-11-28 Towmotor Corp Process of placing a head in a space with a lift truck
US4132317A (en) * 1977-04-12 1979-01-02 Spetsialnoe Konstruktorskoe Bjuro Gazstroimashina Pipe laying crane
US4690610A (en) * 1986-04-24 1987-09-01 Caterpillar Industrial Inc. Lift mast transport arrangement
US6065556A (en) * 1994-08-30 2000-05-23 Van William Concepts Pty. Ltd. Variable wheel base vehicle
USRE43943E1 (en) 1994-08-30 2013-01-29 Extendquip, Llc Variable wheel base vehicle
US5788452A (en) * 1997-07-14 1998-08-04 Gerardus J. Brouwer Forklift vehicle
US20090206589A1 (en) * 2007-08-06 2009-08-20 Extendquip, Llc Extendable frame work vehicle having lift member movable in a true vertical fashion
US8103418B2 (en) 2007-08-06 2012-01-24 Extendquip Llc Extendable frame work vehicle having lift member movable in a true vertical fashion
US20090038186A1 (en) * 2007-08-06 2009-02-12 Extendquip, Llc Extendable frame work vehicle
US8602153B2 (en) 2007-08-06 2013-12-10 Extendquip Llc Extendable frame work vehicle
US9308939B2 (en) 2007-08-06 2016-04-12 Extendedquip, LLC Extendable frame work vehicle
US20150151952A1 (en) * 2012-05-31 2015-06-04 Ponsse Oyj Stabilizing of forest work unit
US9550656B2 (en) * 2012-05-31 2017-01-24 Ponsse Oyj Stabilizing of forest work unit
RU2617897C2 (ru) * 2012-05-31 2017-04-28 Понссе Ойй Стабилизация лесозаготовительной машины
CN103204447A (zh) * 2013-04-03 2013-07-17 同济大学 蜂窝式液压顶推装置

Also Published As

Publication number Publication date
DE1907750C3 (de) 1974-05-30
NL6902812A (de) 1969-10-21
AT285439B (de) 1970-10-27
DE1907750A1 (de) 1969-11-06
SE345645B (de) 1972-06-05
DE1907750B2 (de) 1973-10-25
GB1239148A (de) 1971-07-14
FR2006412A1 (de) 1969-12-26

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