US3738502A - Fork lift leveling control - Google Patents

Fork lift leveling control Download PDF

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Publication number
US3738502A
US3738502A US00175236A US3738502DA US3738502A US 3738502 A US3738502 A US 3738502A US 00175236 A US00175236 A US 00175236A US 3738502D A US3738502D A US 3738502DA US 3738502 A US3738502 A US 3738502A
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United States
Prior art keywords
load
stabilizer
mast
vehicle
sensing device
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Expired - Lifetime
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US00175236A
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English (en)
Inventor
F Noller
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Massey Ferguson Inc
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Massey Ferguson Inc
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Assigned to J. HENRY SCHRODER BANK & TRUST COMPANY, A NEW YORK BANKING INSTITUTION AS TRUSTEE, SIEVERS, GEORGE R., AS INDIVIDUAL TRUSTEE reassignment J. HENRY SCHRODER BANK & TRUST COMPANY, A NEW YORK BANKING INSTITUTION AS TRUSTEE SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MASSEY-FERGUSON, INC.
Assigned to J. HENRY SCHRODER BANK & TRUST COMPANY, A NY BANKING INSTITUTION (TRUSTEE), SIEVERS, GEORGE R. (INDIVIDUAL TRUSTEE) reassignment J. HENRY SCHRODER BANK & TRUST COMPANY, A NY BANKING INSTITUTION (TRUSTEE) SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MASSEY-FERGUSON INC., A MD. CORP.
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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
    • B66F9/07559—Stabilizing means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D37/00—Stabilising vehicle bodies without controlling suspension arrangements

Definitions

  • ABSTRACT A load-lifting mechanism for fork-lift type load handling device which is equipped with power actuated extendable links for adjustable support of the device on the ground and automatic control means including a vertical level sensing device interconnected between the load lifting mechanism of the device and the extendable links for automatic adjustment of the extendable links in response to an inclined position of the load lifting device while simultaneously interrupting movement of the load until the lifting device is brought back into level position.
  • the present invention relates to control-mechanism for fork-lifts or the like and more in particular to an automatic adjustment mechanism for the load lifting mast of a load handling device.
  • Forklift trucks are commonly known and widely employed in industry for transport of a load from one location to another. Most of the fork-lift trucks are provided with vertical columns or masts along which the load can be lifted to a predetermined height level for deposit or removal of the load at high locations.
  • the present invention provides improved automatically operable load levelling means for a load handling device of the type employing an upright column or mast along which the load has to be raised or lowered, preferably along a vertical center relative to the ground surface on which the device is operating.
  • the present improved mechanism can be comparatively easily installed and can be advantageously coordinated with already existing vehicle support and levelling means.
  • the improved control means of the invention for vertical adjustment of the load lifting means are incorporated in a tractor-type vehicle having front steering wheels and a pair of rear driving wheels.
  • the load lifting device is attached to the rear end of the vehicle adjacent the rear driving wheels and the vehicle includes a pair of laterally extending stabilizer arms which are fluid actuated for stabilizing support on the ground.
  • the load lifting means is in the form of an extendable mast which supports a load carrying member for vertical movement of the load along the mast to deposit a load onto or remove a load from elevated locations.
  • the load lifting device is similarly fluid actuated from a common source of fluid under pressure and an automatic fluid control means in conjunction with a sensing device is incorporated between the fluid mechanism of the load lifting device and the fluid mechanisms of the stabilizer arms to (1 individually adjust anyone or both of the stabilizer arms in response to an inclinedposition of the load lifting device and (2) prevent vertical movement of the load along the load lifting device when the load lifting device is in an inclined position to thereby prevent spilling of the load or subsequent tipping-over of the vehicle.
  • FIG. 1 is a side elevation of a load handling device including an upright load lifting means shown in extended position and incorporating the features of the present invention
  • FIG. 2 is a rear end view of the load handling device of FIG. 1 shown in laterally adjusted operating position and;
  • FIG. 3 is a fluid diagram of the hydraulic system embodied in the present invention.
  • the load handling device illustrated in FIG. 1 and 2 comprises a tractor 10 having an engine compartment 12 and an operator station 14.
  • the tractor vehicle 10 is suitably supported for movement on a pair of ground engaging front wheels 16 and a pair of rear driving wheels 18.
  • tractor vehicle 10 may be of the front-end loader type commonly employed on construction sites for material removing and may thus be equipped with a front end bucket mechanism 2t Bucket mechanism 20, however, does not form any part of the present invention other than conveniently providing a counter-balancing means as will be described.
  • front-end loaders of the type herein illustrated may be selectively provided with a rear attachment, such as a back-hoe implement or the like, to provide various operating functions, for convenience and economy.
  • the rear end of tractor is provided with an auxiliary support frame 22 extending transverse to a longitudinal center line X of the tractor.
  • auxiliary support frame 22 Mounted to the rear end frame 22 are a pair of opposite laterally extending brackets 24 and 26 respectively as seen in FIG. 2. 1
  • each of the brackets 24-26 pivotally secure each an outwardly extending stabilizer arm 28 and 30 respectively and each is provided at its outer end with a pivotable ground support pad 32.
  • stabilizer arms 28-30 will be swung upwardly away from the ground whereas in stationary operating position of tractor vehicle 10, as illustrated in FIG. 1 and 2, stabilizer arms 28-30, as is known, will be swung downwardly for contact of support pads 32 upon the ground surface G to laterally stabilize tractor vehicle 10.
  • ground surface G may be relatively uneven in both transverse and longitudinal direction of tractor vehicle 10 requiring either stabilizer arm 28 or 30 to be disposed at a different angle relative to the other stabilizer arm.
  • stabilizer arms 28-30 are actuated for swinging movement towards or away from ground G by means of extendable link members 34 and 36 respectively which each have one end pivoted to the outer end of the respective stabilizer arm whereas the opposite ends of extendable links 34-36 are pivotally secured to the upper end of the respective side brackets 24-26 as most clearly shown in FIG. 2.
  • the auxiliary rear end frame 22 of tractor vehicle 10 supports a load lifting device generally indicated at 38.
  • Load lifting device 38 comprises a vertically extendable column or mast assembly 40 comprised of a series of telescoped sections extendable from or retractable relative to a primary mast portion 42.
  • the extendable mast assembly 40 supports a load carrying means as, for instance, a fork lift assembly 44.
  • Load support means 44 is adapted to carry a load L" for deposit on or removal from an elevated location such as the upper deck of a structure generally indicated at S to the left in FIG. 1.
  • the load L" is adapted to be moved in vertical direction along extendable mast assembly 40 between the ground G and a designated elevated position, as is known in practice. Vertical movement of load L along mast assembly 40 is provided for by means of an extendable link 46 connected between the rear end frame 22 and the load L as seen in FIG. 2.
  • mast assembly 40 may be pivotable around a horizontal axis Z relative to rear end frame 22 and is supported for for and aft tilting movement by means of extendable links 48 connected between the mast assembly and tractor vehicle 10.
  • the load lifting device 38 is operated by means of controls 50 at the rear of tractor vehicle 10 forming a part of the operators station l4.
  • each of the extendable links 34-36 for the stabilizer arms 28-30 comprise a fluid cylinder 52 and 54 respectively having a piston 56 reciprocably supported therein to which is attached a piston rod 58 for extension outwardly therefrom.
  • the rear end of fluid cylinder 52 of left hand stabilizer arm 28 is in communication with a conduit 60 and the front end of cylinder 52 is in communication with a conduit 62 for connection to the source of fluid under pressure by means of common conduit 64.
  • the source of fluid under pressure may comprise a pump 66 and a reservoir 68 supported in the tractor vehicle 10.
  • fluid cylinder 54 of right hand stabilizer arm 30 is in communication with rear end conduit 70 and front end conduit 72 for selective fluid connection to the pump 66 by means of conduit 74.
  • the left hand stabilizer assembly 28-34 includes a left hand stabilizer selector valve 76 between the conduits 62-60 and conduit 64 for selective fluid communication of either conduit 62-60 with conduit 64 and pump 66.
  • Left hand selector valve 76 is normally spring biased in closed position as shown in FIG. 3 and is manually shiftable between two operating positions 76a and 76b.
  • position 76a of valve 76 the rear end conduit 60 is connected to reservoir 68 and front end conduit 62 will be in fluid connection with conduit 64 and pump 66 to apply fluid pressure to the front end of cylinder 52 for raising movement of stabilizer arm 28.
  • Shifting valve 76 to position 76b connects rear end conduit 60 with pump conduit 64 to apply fluid pressure at the rear of piston 56 for lowering of stabilizer arm 28. In this position, front end conduit 62 will be connected to the reservoir 68.
  • the right hand stabilizer assemly 30-36 is similarly provided with a right hand stabilizer selector valve 78 normally closed and manually shiftable between two operating positions 78a and 78b. Operation of right hand stabilizer selector valve 78 is identical to that of selector valve 76 as described above and, therefore, does not need to be repeated. conventionally, manual control of stabilizer selector valves 76 and 78 is provided for at the control 50 in operator station 14 of the vehicle (FIG. 1). 7
  • Tilt selector valve 80 is of identical construction as valves 76-80 and manually shiftable between two operative positions 80a or 80b for selective application of fluid pressure to either the front end or rear end of tilt cylinders 48 as previously described in connection with stabilizer selector valves 76-78.
  • the extendable link 46 of load lifting device 38 similarly comprises a fluid cylinder 82 having a piston 84 reciprocable thereinand a piston rod 86 for extension outwardly of cylinder 82 for connection to the load.
  • Cylinder 82 of load lifting device 38 is selectively connectable by means of single fluid conduit 88 at the rear of piston 84 to a pump conduit 90 for selective application of fluid pressure to the rear end of cylinder 82 for raising of the load or, conversely, bleeding fluid from the rear of cylinder 82 back into reservoir 68 by means of pressure of the load on piston 84 to lower the load.
  • Lift selector valve 92 is similarly manually operable between two operative positions 920 or 92b from the normally closed position shown in FIG. 3 by provision of suitable control means at the control station 50, the same as selector valves 76, 78 and 80.
  • conduit 88 will be connected to pump conduit 90 to apply fluid pressure behind piston 84 of cylinder 82 for lifting of the load. It will be understood that it is conventional practice to provide the front end of lift cylinder 82 with suitable air venting means (not shown) in order to dissipate atmospheric pressure in front of piston 84.
  • the primary feature of the present invention lies in the provision of automatic controls to automatically shift and retain the load in correct vertical position along a vertical line Y" normal to the horizontal axis Z of the load handling device 10.
  • the present improved automatic load levelling control means comprises a load levelling control valve 94 disposed between the lift cylinder 82 and lift selector valve 92.
  • load levelling control valve 94 In the normal operating position of load levelling control valve 94, as shown in FIG. 3, fluid communication is provided between the rear end of lift cylinder 82 and conduit 88 so that upon shifting of selector lift valve 92 into the appropriate position fluid communication is established between lift cylinder 82 and pump 66, or reservoir 68, as previously described.
  • Automatic load levelling control valve 94 is shiftable between two alternate positions, indicated at 94a and 94b, for selective fluid communication of pump 66 with either left hand stabilizer cylinder 52 or right hand stabilizer cylinder 54 in response to an inclined position of load lifting device 38.
  • conduit 88 will be fluidly connected to conduit 96 which is in direct communication with conduit 60 of the left hand stabilizer cylinder 52 and by-passing left hand stabilizer selector valve 76.
  • this position of load levelling control valve 94 as indicated in FIG. 3 by means of dot and dash lines, fluid pressure communication is provided to the rear of piston 56 of left hand stabilizer cylinder 52.
  • Front end conduit 62 of stabilizer cylinder 52 in thisposition, is connected by means of conduit 98, and conduit 100 to the reservoir 68 by means of a by-pass through valve 94.
  • conduit 98 conduit 98
  • conduit 100 conduit 100 to the reservoir 68 by means of a by-pass through valve 94.
  • conduit 88 When load levelling control valve 94 is shifted to the position 94b conduit 88 will be fluidly connected to the rear end of right hand stabilizer cylinder 54 by means of conduit 102; by-passing the right hand stabilizer selector valve 78. In this position of load levelling control valve 94, which is indicated in dash lines in FIG. 3, the
  • Fluid conduits 98 and 104 communicate with the reservoir 68 in either shifted position of load levelling control valve 94 and are protected against back-flow of fluid pressure by means of appropriate conventional check valves 106 and 108 respectively.
  • Load levelling control valve 94 is automatically shifted from its normal position shown in FIG. 3, to either position 94a or 94b by means of an actuator such as solenoid 110 which in turn is connected for push or pull actuation to a position sensing device 112 of conventionally known structure.
  • sensing device 112 may be of the hydraulically damped pendulum type or may be an electrical mercury switch for appropriate push or pull energization of solenoid 110 in response to either right or left lateral inclination of load lifting device 38 due to uneven ground conditions upon which the vehicle 10 is supported.
  • Sensing device 112 is appropriately attached to the lifting device 38, as shown in FIG. 1 and FIG. 2, so as to be operable to pick-up a designated degree of inclination of the load lifting device 38 in response to the uneven ground conditions as illustrated in FIG. 1 and 2.
  • the vehicle 10 (conventional lift truck or tractor as the case may be) is moved into operating position adjacent a load receiving or storage station 8.
  • the opposite stabilizer arms 28-30 are then swung downwardly by means of actuation of stabilizer cylinders 52-54 through manipulation of stabilizer cylinder valves 76-78 for contact of pads 32 upon the ground G.
  • the front end implement 20 is lowered onto the ground surface G by suitable hydraulic or mechanical means to provide a convenient counterbalance for the rear end load lifting device 38 during load lifting operation.
  • the conventional front implement 20 may be substituted by an appropriatecounterbalancing device, as is known.
  • ground G provides uneven surface elevations relative to the horizontal axis Z" of the vehicle 10.
  • the stabilizer arms 28-30 will have to be adjusted independently of each other to move the mast assembly 40 into a safe vertical position i.e., parallel to vertical line Y.
  • the load lifting device 38 would be sharply inclined towards the right in FIG. 2 due to the uneven ground condition. Such an inclination of load lifting device 38 will be detected by sensing device 112 which then functions to energize solenoid 110 for appropriate repositioning of load levelling control valve 94. Repositioning of control valve 94 from normal to the position 94b (indicated by dash lines in FIG. 3) causes temporaryinterruption of fluid communication between lift cylinder 82 and pump 66. Such interruption will occur in either position 94a or 92b of lift selector valve 92 to stop movement of the load along the mast assembly 40.
  • conduit 88 is connected through conduits 102 and 70 to the rear end of right hand stabilizer cylinder 54 for further extension of extendable link assembly 36 in order to upright load lifting device 38 until it is parallel to vertical line Y.
  • valve 94b the front end of the right hand stabilizer cylinder 54 in the position 94b of valve 94 will then be connected by conduits 72, 104, 98 and 100 to the reservoir 68 for back-flow of fluid from the front end of cylinder 54 due to reduced chamber volume by fluid pressure at the front end of cylinder 54.
  • check valve 108 effectively prevents any backflow of fluid from reservoir 68.
  • the present invention provides an improved, fully automatic, load levelling means for a vertical load lifting device which is immediately responsive to a predetermined inclination of the load lifting device to correct this condition by utilization of existing levelling means associated with the load handling device while at the same time temporarily interrupting load movement along the load lifting device until the inclined position is corrected.
  • an automatic control system for stabilizing the mast comprising: a sensing device for detecting angular deviation of the mast to either side of the vehicle of the load handling apparatus to a vertical axis, an actuator for receiving a signal from said sensing device, a hydraulic valve operated by said actuator for overriding the stabilizer arm manual valve by directing twoway flow to either one of the stabilizer arms around the manual control valves by connecting the stabilizer arms to the power source whenever said sensing device detects angular deviation of the mast in the direction of either one of the stabilizer arms.
  • a load leveling system comprising a source of power for actuation of the adjustable stabilizer arms and power control means including an inclination sensing device for detecting angular deviation to either side of the vehicle of the load handling apparatus to a vertical axis, a leveling control and an actuator connecting said sensing device with said leveling control, said leveling control selectively connecting said power source to the adjustable stabilizer arms and the load lifting device upon a signal from said sensing device to said actuator to automatically prevent movement of the load lifting device and actuate an adjustable stabilizer arm whenever a predetermined side inclination of the load handling apparatus toward an adjustable stabilizer arm occurs.

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Forklifts And Lifting Vehicles (AREA)
US00175236A 1971-08-26 1971-08-26 Fork lift leveling control Expired - Lifetime US3738502A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US17523671A 1971-08-26 1971-08-26

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US3738502A true US3738502A (en) 1973-06-12

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US00175236A Expired - Lifetime US3738502A (en) 1971-08-26 1971-08-26 Fork lift leveling control

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US (1) US3738502A (it)
AU (1) AU4509672A (it)
CA (1) CA965770A (it)
DE (1) DE2240552A1 (it)
FR (1) FR2150522B1 (it)
GB (1) GB1408906A (it)
IT (1) IT963561B (it)
SE (1) SE371173B (it)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4867277A (en) * 1988-09-29 1989-09-19 Sloan William C Portable lifting device and cart
US4913458A (en) * 1986-04-24 1990-04-03 Hamilton Mark L Surveillance vehicle control system
US6345854B1 (en) 1998-12-23 2002-02-12 Vt Holdings Ii, Inc. Mechanism for synchronizing and controlling multiple actuators of a slide out room of mobile living quarters
US6575514B2 (en) 2000-11-22 2003-06-10 Vt Holdings Ii, Inc. Hydraulic synchronizer mechanism for a slide-out room
CN102616702A (zh) * 2012-03-26 2012-08-01 三一集团有限公司 一种集装箱堆高机
CN104326404A (zh) * 2014-10-20 2015-02-04 苏州先锋物流装备科技有限公司 一种具有自平衡功能的结构

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE415018B (sv) * 1977-11-30 1980-09-01 Sven Petersson Indikator for visande av lutningen hos griporganen pa en gaffeltruck
FR2568236B1 (fr) * 1984-07-30 1987-11-13 Noirot Yves Chargeur-elevateur
KR19980028699A (ko) * 1996-10-23 1998-07-15 이해규 상하역 장비의 마스트 경사안정화 장치 및 방법
US20100178144A1 (en) * 2007-06-25 2010-07-15 Martin Vestergaard Pendular cargo displacer
CN116354275B (zh) * 2023-03-28 2023-10-13 湖北中宸建筑安装有限公司 一种装载平衡叉车

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU152556A1 (it) *
US2713402A (en) * 1949-07-15 1955-07-19 Mccabe Powers Auto Body Co Tower vehicle leveling device
GB1048723A (en) * 1964-02-25 1966-11-16 Priestman Brothers Improvements relating to tilt-sensitive devices
US3494494A (en) * 1968-01-02 1970-02-10 Allis Chalmers Mfg Co Forward tilt protection system for lift truck
US3630317A (en) * 1968-10-16 1971-12-28 Knut Folke Jacobsson Arrangement for stabilization of trucks

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU152556A1 (it) *
SU235266A1 (ru) * В. Ф. Кузин , А. Ф. Кузин Устройство для стабилизации равновесного положения подъемной вышки
US2713402A (en) * 1949-07-15 1955-07-19 Mccabe Powers Auto Body Co Tower vehicle leveling device
GB1048723A (en) * 1964-02-25 1966-11-16 Priestman Brothers Improvements relating to tilt-sensitive devices
US3494494A (en) * 1968-01-02 1970-02-10 Allis Chalmers Mfg Co Forward tilt protection system for lift truck
US3630317A (en) * 1968-10-16 1971-12-28 Knut Folke Jacobsson Arrangement for stabilization of trucks

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4913458A (en) * 1986-04-24 1990-04-03 Hamilton Mark L Surveillance vehicle control system
US4867277A (en) * 1988-09-29 1989-09-19 Sloan William C Portable lifting device and cart
US6345854B1 (en) 1998-12-23 2002-02-12 Vt Holdings Ii, Inc. Mechanism for synchronizing and controlling multiple actuators of a slide out room of mobile living quarters
US6575514B2 (en) 2000-11-22 2003-06-10 Vt Holdings Ii, Inc. Hydraulic synchronizer mechanism for a slide-out room
CN102616702A (zh) * 2012-03-26 2012-08-01 三一集团有限公司 一种集装箱堆高机
CN104326404A (zh) * 2014-10-20 2015-02-04 苏州先锋物流装备科技有限公司 一种具有自平衡功能的结构

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Publication number Publication date
FR2150522A1 (it) 1973-04-06
SE371173B (it) 1974-11-11
FR2150522B1 (it) 1978-04-21
CA965770A (en) 1975-04-08
AU4509672A (en) 1974-01-31
GB1408906A (en) 1975-10-08
IT963561B (it) 1974-01-21
DE2240552A1 (de) 1973-03-01

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AS Assignment

Owner name: J. HENRY SCHRODER BANK & TRUST COMPANY, A NEW YOR

Free format text: SECURITY INTEREST;ASSIGNOR:MASSEY-FERGUSON, INC.;REEL/FRAME:004164/0687

Effective date: 19830217

Owner name: SIEVERS, GEORGE R., AS INDIVIDUAL TRUSTEE

Free format text: SECURITY INTEREST;ASSIGNOR:MASSEY-FERGUSON, INC.;REEL/FRAME:004164/0687

Effective date: 19830217

AS Assignment

Owner name: SIEVERS, GEORGE R. (INDIVIDUAL TRUSTEE)

Free format text: SECURITY INTEREST;ASSIGNOR:MASSEY-FERGUSON INC., A MD. CORP.;REEL/FRAME:004583/0684

Effective date: 19860509

Owner name: J. HENRY SCHRODER BANK & TRUST COMPANY, A NY BANKI

Free format text: SECURITY INTEREST;ASSIGNOR:MASSEY-FERGUSON INC., A MD. CORP.;REEL/FRAME:004583/0684

Effective date: 19860509