US3802589A - Dual extensible reach truck - Google Patents

Dual extensible reach truck Download PDF

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Publication number
US3802589A
US3802589A US00250697A US25069772A US3802589A US 3802589 A US3802589 A US 3802589A US 00250697 A US00250697 A US 00250697A US 25069772 A US25069772 A US 25069772A US 3802589 A US3802589 A US 3802589A
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United States
Prior art keywords
boom
truck
extensible
attachment
load
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
Application number
US00250697A
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English (en)
Inventor
D Holtkamp
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Doosan Bobcat North America Inc
Original Assignee
Clark Equipment Co
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 Clark Equipment Co filed Critical Clark Equipment Co
Priority to US00250697A priority Critical patent/US3802589A/en
Priority to DE2318463A priority patent/DE2318463A1/de
Priority to CA169,444A priority patent/CA985221A/en
Priority to AU54599/73A priority patent/AU476607B2/en
Priority to JP48044259A priority patent/JPS4920811A/ja
Priority to AR247832A priority patent/AR200867A1/es
Priority to FR7316087A priority patent/FR2183782B1/fr
Priority to BE130742A priority patent/BE799095A/xx
Priority to GB2140173A priority patent/GB1399572A/en
Priority to BR3232/73A priority patent/BR7303232D0/pt
Application granted granted Critical
Publication of US3802589A publication Critical patent/US3802589A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/065—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 non-masted
    • B66F9/0655—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 non-masted with a telescopic boom

Definitions

  • ABSTRACT An extensible mechanism for reach trucks in which the mechanism has an extensible and retractable vertical member pivotally attached to the rear portion of the vehicle for pivoting forwardly and rearwardly, a boom connected to the upper end of the vertical member and extending forwardly for supporting a load attachment such as a fork, and an extensible and retractable member spaced forwardly from the vertical member for supporting and pivoting the boom.
  • Power cylinders are preferably used to extend and retract the two extensible and retractable members, and a power means is provided for pivoting the vertical member forwardly and rearwardly.
  • the two extensible members may be moved in unison to lift the boom vertically on a plane, or one of the members may be moved while the other remains stationary, or they may be moved at different rates in order to lift, move and place a load on the boomattachment in a desired location.
  • Either single or multiple extensible and retractable vertical and power members may be used to control the operation of the boom.
  • This type of truck has the further special advantage of being able to pick up a load immediately in front of the truck where the ground is firm, transport the load to the' work site, and deliver it to the scaffolding platform or partially completed building and yet avoid driving onto the usual soft backfill around the outside of the building.
  • the extended reach trucks of the standard or well known construction utilize a parallelogram arrangement for the members supporting the forwardly extending support or boom, with the members pivoted to one another and to the truck frame.
  • an extended reach truck having a boom structure in which the boom is pivoted at its rear end to extensible posts and is supported midway by an extensible power means, thus permitting the boom to be lifted and lowered and extended and retracted on a plane, thereby providing good maneuverability and maximum reach of the boom at various load pick up and discharging levels.
  • Another object of the invention is to provide a truck having-an extended reach mechanism which has the ability to pick up a load below ground level, and which can be. controlled either manually or automatically to compensate for compression of the truck tires by the load or downwardly or upwardly tilting of the forward end of the truck as a result of the terrain, to obtain movement of the load on the horizontal plane under those conditions.
  • Still another object of the invention is to provide a material handling truck having an extended load mechanism of the aforesaid type which is so constructed and designed that it has maximum stability in all load handling positions and can be adapted to various types of truck designs without any appreciable modifications in the basic structure of the mechanism. 7
  • FIG. 1 is a perspective view of an extended reach truck embodying the present invention and showing the extended reach mechanism in its lowered position in full lines and in an elevated position in broken lines;
  • FIG. 2 is a side elevational view of the present lift truck showing the extended reach mechanism in its lowered and elevated positions;
  • FIG. 3 is a front elevational view of the truck shown in FIGS. 1 and 2;
  • FIG. 4 is a rear elevational view of the truck shown in the'preceding figures.
  • FIG. 5 is a schematic diagram of the operating system of the extended reach mechanism.
  • numeral 10 indicates generally a lift truck on which the present extended reach mechanism 12 is mounted, the truck having front drive wheels 14 and 16 and rear steerable wheels 18 and 20. While only the front wheels are driven and the rear wheels are steerable, the truck may be one in which the front and rear wheels are steerable and in which both sets of wheels are drive wheels.
  • the motor driving the truck and providing the power for operating the extended reach mechanism is under hood cover 22 and is mounted on frame24, and the truck is controlled by an operator from cab 26 wherein the manual controls shown in FIG. 5 are located.
  • the extended reach mechanism may be mounted on various types of trucks and truck frames, the one shown has two longitudinal side members and a plurality of cross members formingthe support for the motor, controls and cab, and also forming the basic support for the extended reach mechanism.
  • Various changes in the truck structure can be made to adapt it to the desired operation to be performed thereby.
  • the extended lift mechanism 12 includes a pair of posts 30 and 32 normally assuming a substantially upright position and being pivotally mounted on a shaft 34 secured to the rear end of frame 24 by mounting fixture 36.
  • the two posts are rigidly joined to one another by a steel plate 38 to form a bifurcated structure which is adapted to tilt forwardly and rearwardly on the two pivot means 40 and 42, respectively, at opposite ends of shaft 34.
  • Boom or arm 44 consisting of two longitudinal members 45 and 46 is pivotally connected to the upper ends of posts 30 and 32, respectively, and extends forwardly therefrom parallel to the sides of frame 24, the two members being adapted to pivot on the upper ends of the posts from a position such as that shown in solid lines in FIG. 2 to an elevated position shown in broken lines.
  • Arm member 45 is pivotally connected to the upper end of post 30 by a shaft 48
  • arm member 46 is pivotally connected to the upper end of post 32 by a shaft 50.
  • a plurality of cross members 52 tie the two arm members together so that they operate in unison in moving loads from one position to another, both forwardly and rearwardly and up and down.
  • extensions 54 and 56 Joined to the forward end of the arms and forming a part thereof are extensions 54 and 56 joined rigidly at one end to the main portion of the arms and pivotally supporting a load attachment 60 at the other end.
  • Pivot pins 62 and 64 connect the forward end of the extensions to fixtures 66 and 68, respectively, on the attachment.
  • the load attachment which may be considered conventional for the purpose of the present description, is shown as a fork lift, and is moved to various angular positions by a suitable power mechanism such as a hydraulic cylinder 76.
  • the fork attachment is provided with two spaced forks 77 and 78 rigidly connected to and supported by body or back structure 79.
  • Posts and 32 are of a telescopic construction, i.e., are extensible and contractable between the contracted position shown in full lines in FIG. 2 and the extended position shown in phantom in the same figure, the posts each having a conventional hydraulic cylinder assembly 80, consisting of an external cylinder 81, and a piston and piston rod 84 and 86, respectively, the latter being connected to the rear end of the boom 44.
  • Posts 30 and 32 are pivoted forwardly and rearwardly on pivots 40 and 42 by cylinder assemblies 90 on opposite sides of the truck, which are connected at one end to frame 24 by fixtures 92, and connected at the other end through the piston rod 93 to pivot means 94, the two hydraulic cylinders being operated together from the same hydraulic system.
  • Boom 44 is raised and lowered and pivoted relative to posts 30 and 32 by a pair of extensible and contractable legs 96 and 98, each consisting of hydraulic cylinder assemblies 100, the lower end.
  • each cylinder being connected to the frame by a fixture 102 and the upper end through piston rod 103 to the arm members by a fixture 104.
  • Fixture 104 for the upper end of cylinder assembly 100 is spaced further from pivot 48 than fixture 102 for the lower end of the assembly is from pivot means 40. Movement of the hydraulic mechanism in the two posts 30 and 32 moves the rear end of the boom upwardly or downwardly, causing the fixture 104 to which hydraulic cylinders 100 are connected to function as the fulcrum for the boom.
  • the hydraulic cylinder 76 which is pivoted to extension 54 by a fixture 112 and to one of the side members of the upright by a fixture 114, may be operated from the hydraulic system of the truck as part of the system which operates the hydraulic cylinders of the extended reach mechanism, or by a separate hydraulic system, as described.
  • the hydraulic system for operating cylinder assemblies 80, 90 and 100 is shown schematically in FIG. 5, numeral 118 indicating generally the portion of the system controlling cylinder 80 in the posts, numeral 120 indicating generally the portion of the system controlling the cylinder 90, and numeral 122 indicating generally the portion of the system controlling cylinder 100.
  • System 120 is connected to hydraulic pump 124 which delivcrcs oil from a tank or sump 126 through linel28 to a valve 130.
  • the valve is connected to the cylinder on opposite sides of piston 132 by lines 134 and 136, and line 128 is connected through the valve to the sump byline 138.
  • Line 128 is also connected to the valve by a branch line 140 which has a check valve 142 therein, and the return line for the valve is connected to line 138 and to the sump by a line 144.
  • branch line 140 which has a check valve 142 therein
  • the return line for the valve is connected to line 138 and to the sump by a line 144.
  • a pressure relief valve indicated generally by numeral connects line 128 with line 138, thus limiting the maximum pressure in line 128 for operating the piston when the pump is in operation.
  • Hydraulic system 122 is connected to pump 124 by line 128, which is an extension of line 128.
  • Line 128' is connected to valve 158 by a branch line 160 containing a check valve 161, and to the return line 138 by a line 162 when the valve is in its centered position.
  • the valve is connected to cylinder 100 by lines 164 and 166.
  • the valve 158 is moved upwardly, as viewed in FIG. 5, thus connecting branch line 160 with line 164 and with the cylinder on the under side of piston 168, and connecting line 166 with return line 169, thus causing piston rod 103 to move the arm upwardly.
  • valve 158 When the boom is to be lowered, the valve is moved downwardly, connecting branch line 160 with line 166 and line 164 with return line 169. Since system 122 depends on valve 130 being in its neutral position for operation, valve 158 cannot control cylinder 100 while valve 130 is being controlled to operate cylinder 90, since movement of the latter valve in either direction disrupts the flow of fluid to valve 158.
  • Hydraulic system 118 which controls the operation of hydraulic cylinder assembly 80 consists of a valve connected to sump 126 or other suitable source of hydraulic fluid, by pressure line 182 and pump 184 and return line 186.
  • a pressure relief valve 188 connects lines 182 and 186, thus limiting the maximum pressure in line 182 for operating the cylinder 82.
  • the valve which is shown as operated manually by a lever 189, is connected to the cylinder on opposite sides of piston 84 by lines 190 and 192. When the rear end of the boom is to be elevated, the valve is moved downwardly as viewed in FIG.
  • Cylinder assembly 100 may be held in a stationary position while cylinder assembly 80 is operated to tilt the boom upwardly or downwardly, and hence move the attachment 60 downwardly or upwardly, or the two cylinder assemblies 80 and 100 may be operated simultaneously to lift or lower the boom while maintaining the boom at a flxed angular position.
  • the two hydraulic assemblies 80 and 100 operate to raise the load directly upwardly or downwardly without attachment can be lowered to a point beneath the ground level on which the truck rests, and it can be retracted or advanced at various levels for raising and discharging a load by the operation of cylinder 90. This permits a load to be picked up without the wheels of 'the truck traversing the earth around the building under construction and to be placed in a door, window or other opening, or on-a platform at a level substantially above the height of the truck. I
  • a compensating mechanism such as the hydraulic system indicated generally by numeral 180 in copending U.S. Pat. application Ser. No. 221,346, filed Jan. 27, 1972, and owned by a common assignee, can be incorporated in the present extensible reach mechanism to prevent drooping of the load on the attachment and, under certain operating conditions, to maintain the movement of the boom and load on a horizontal plane.
  • an adjustment means such as a hydraulic cylinder which extends and contracts with cylinder 80, maintains the mechanism in proper relationship with the posts and boom regardless of any temporarily adjusted length of the posts.
  • the compensation 'for droop can be performed entirely by the manual controls if desired.
  • An extensible reach mechanism for a truck having a frame with a forward end and a rearward end comprising a telescoping extensible and retractable post pivotal in either direction from a substantially vertical position, at its lower end to the rear end of the truck frame, a boom pivotally connected to the upper-end of upper surface of the platform, cylinder 90 is operated to move attachment 60 and the load thereon onto the platform. Cylinder 100 is then lowered sufficiently to place the load on the platform, and cylinder 90 is operated to withdraw the attachment from the load and the platform.
  • Cylinders 80 and 100 are operatedby separate and independent controls so that the load can be maneuvered effectively, either by raising the boom upwardly or downwardly while maintaining it on a substantially horizontal plane, or one cylinder may be moved while holding the other cylinder fixed, thereby pivoting the boom at the center or at the rear end, de pending upon which of the two cylinders is moved.
  • the tines of the attachment are maintained'on a substantially horizontal plane by cylinder 76 as the boom is moved from the position shown in full lines in FIG. 2 to the position shown in broken lines.
  • the present extended reach mechanism places a substantial part of the mechanism near the rear of the vehicle, thus counterbalancing at least a portion of the load attachment- 60 and at the same time giving the driver a good forward view and a good view of the load and the attachment, so that the truck can be easily maneuvered and the lift mechanism can be operated effectively to place the load in any desired elevated position, without interference from any upright or other mechanism which could seriously obscure the view.
  • the mechanism permits the load to be readily placed in any desired location on a scaffolding platform or through an elevated door or window of the building being constructed, without requiring the truck to move directly beneath the scaffolding or building wall and without requiring special handling of the load.
  • An extensible reach mechanism for a truck as defined in claim 1 in-which a pair of said posts and a pair of said second legs-support and operate said boom, and said posts and second power means include hydraulic cylinders.
  • An extensible reach mechanism for a truck as defined in claim 1 in which a hydraulic cylinder is connected to said load attachment and to said boom to position said attachment angularly with respect to said boom.
  • An extensible reach mechanism for a truck as defined in claim 1 in which said leg is spaced further from said post at the top than at the bottom, and said boom includes a downwardly extending portion to facilitate lowering said load carrying attachment to a point below the level of the ground on which the truck is supported.
  • An extensible reach mechanism for a truck as defined in claim 3 in which said leg is spaced further from said post at the top than at the bottom and said boom includes a downwardly extending portion to facilitate lowering said load carrying attachment to a point below the level of the ground on which the truck is supported.
  • An extensible reach mechanism for a truck as defined in claim 7 in which a hydraulic cylinder is connected to said load attachment and to said boom to position said attachment angularly with respect to said boom.
  • An extensible reach mechanism for a truck as defined in claim 8 in which a hydraulic cylinder is connected to said load attachment and to said boom to position said attachment angularly with respect to said boom.

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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)
  • Jib Cranes (AREA)
US00250697A 1972-05-05 1972-05-05 Dual extensible reach truck Expired - Lifetime US3802589A (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
US00250697A US3802589A (en) 1972-05-05 1972-05-05 Dual extensible reach truck
DE2318463A DE2318463A1 (de) 1972-05-05 1973-04-12 Hubfahrzeug mit zweifach erstreckbarer reichweite
CA169,444A CA985221A (en) 1972-05-05 1973-04-13 Dual extensible reach truck
AU54599/73A AU476607B2 (en) 1972-05-05 1973-04-17 Dual extensible reach truck
JP48044259A JPS4920811A (ja) 1972-05-05 1973-04-20
AR247832A AR200867A1 (es) 1972-05-05 1973-05-03 Mecanismo de alcance extensible para una zorra
FR7316087A FR2183782B1 (ja) 1972-05-05 1973-05-04
BE130742A BE799095A (fr) 1972-05-05 1973-05-04 Chariot elevateur de grande portee,
GB2140173A GB1399572A (en) 1972-05-05 1973-05-04 Trucks having an extensible reach mechanism
BR3232/73A BR7303232D0 (pt) 1972-05-05 1973-05-04 Mecanismo extensivel de duplo alcance para tanque de suspensao

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00250697A US3802589A (en) 1972-05-05 1972-05-05 Dual extensible reach truck

Publications (1)

Publication Number Publication Date
US3802589A true US3802589A (en) 1974-04-09

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ID=22948788

Family Applications (1)

Application Number Title Priority Date Filing Date
US00250697A Expired - Lifetime US3802589A (en) 1972-05-05 1972-05-05 Dual extensible reach truck

Country Status (10)

Country Link
US (1) US3802589A (ja)
JP (1) JPS4920811A (ja)
AR (1) AR200867A1 (ja)
AU (1) AU476607B2 (ja)
BE (1) BE799095A (ja)
BR (1) BR7303232D0 (ja)
CA (1) CA985221A (ja)
DE (1) DE2318463A1 (ja)
FR (1) FR2183782B1 (ja)
GB (1) GB1399572A (ja)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1986005606A1 (en) * 1985-03-19 1986-09-25 Sundstrand Corporation Boom control system
US5709523A (en) * 1995-06-07 1998-01-20 Ware; Emmet P. Material handling lift
US6474933B1 (en) 1995-06-07 2002-11-05 Clark Equipment Company Extended reach vertical lift boom
US20040228715A1 (en) * 2003-05-16 2004-11-18 Clark Equipment Company Folding lift arm assembly for skid steer loader
WO2015127025A1 (en) * 2014-02-21 2015-08-27 Pettibone/Traverse Lift, Llc Reaching loader

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4216869A (en) * 1977-09-21 1980-08-12 Jlg Industries, Inc. Industrial crane
FR2520715A1 (fr) * 1982-01-29 1983-08-05 Cadillon Chariot elevateur a bras telescopiques articules
JPS592016U (ja) * 1982-06-25 1984-01-07 松下電工株式会社 昇降装置用吊下索
US4690030A (en) * 1982-12-09 1987-09-01 Israel Aircraft Industries Ltd. Mine field clearing apparatus
JPS6264797U (ja) * 1985-10-07 1987-04-22
EP0397076A1 (en) * 1989-05-11 1990-11-14 Vickers Incorporated Electrohydraulic system
US5931265A (en) * 1997-03-27 1999-08-03 Otis Elevator Company Rope climbing elevator
US6401871B2 (en) * 1998-02-26 2002-06-11 Otis Elevator Company Tension member for an elevator
US6860367B1 (en) * 1998-09-29 2005-03-01 Otis Elevator Company Elevator system having drive motor located below the elevator car
DE29924760U1 (de) * 1998-02-26 2005-06-23 Otis Elevator Co., Farmington Zugelement für einen Aufzug

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US560086A (en) * 1896-05-12 Alexander dobkins
US2788139A (en) * 1951-11-26 1957-04-09 Tendresse Phillip E La Retractive loader
US3024933A (en) * 1958-03-03 1962-03-13 Pettibone Mulliken Corp Multi-action front end loaders
US3288316A (en) * 1965-06-03 1966-11-29 William S West Boom for loading device
US3338438A (en) * 1966-05-23 1967-08-29 Pak Mor Mfg Company Refuse collecting vehicle with front end container lifting and dumping mechanism
US3410433A (en) * 1966-12-23 1968-11-12 Pettibone Mulliken Corp Servo self-leveling mechanism
US3432050A (en) * 1967-04-17 1969-03-11 Pettibone Mulliken Corp Reaching loader with guided lift cylinders

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US560086A (en) * 1896-05-12 Alexander dobkins
US2788139A (en) * 1951-11-26 1957-04-09 Tendresse Phillip E La Retractive loader
US3024933A (en) * 1958-03-03 1962-03-13 Pettibone Mulliken Corp Multi-action front end loaders
US3288316A (en) * 1965-06-03 1966-11-29 William S West Boom for loading device
US3338438A (en) * 1966-05-23 1967-08-29 Pak Mor Mfg Company Refuse collecting vehicle with front end container lifting and dumping mechanism
US3410433A (en) * 1966-12-23 1968-11-12 Pettibone Mulliken Corp Servo self-leveling mechanism
US3432050A (en) * 1967-04-17 1969-03-11 Pettibone Mulliken Corp Reaching loader with guided lift cylinders

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1986005606A1 (en) * 1985-03-19 1986-09-25 Sundstrand Corporation Boom control system
US4722044A (en) * 1985-03-19 1988-01-26 Sundstrand Corporation Boom control system
US4791549A (en) * 1985-03-19 1988-12-13 Sundstrand Corporation Boom control system
US4910662A (en) * 1985-03-19 1990-03-20 Sundstrand-Sauer Boom control system
US5709523A (en) * 1995-06-07 1998-01-20 Ware; Emmet P. Material handling lift
US6474933B1 (en) 1995-06-07 2002-11-05 Clark Equipment Company Extended reach vertical lift boom
US20040228715A1 (en) * 2003-05-16 2004-11-18 Clark Equipment Company Folding lift arm assembly for skid steer loader
WO2004104304A2 (en) * 2003-05-16 2004-12-02 Clark Equipment Company Folding lift arm assembly for skid steer loader
WO2004104304A3 (en) * 2003-05-16 2005-01-20 Clark Equipment Co Folding lift arm assembly for skid steer loader
US6866466B2 (en) 2003-05-16 2005-03-15 Clark Equipment Company Folding lift arm assembly for skid steer loader
WO2015127025A1 (en) * 2014-02-21 2015-08-27 Pettibone/Traverse Lift, Llc Reaching loader

Also Published As

Publication number Publication date
FR2183782B1 (ja) 1979-01-12
BE799095A (fr) 1973-08-31
CA985221A (en) 1976-03-09
GB1399572A (en) 1975-07-02
AR200867A1 (es) 1974-12-27
AU5459973A (en) 1974-10-17
FR2183782A1 (ja) 1973-12-21
JPS4920811A (ja) 1974-02-23
AU476607B2 (en) 1976-09-30
BR7303232D0 (pt) 1974-06-27
DE2318463A1 (de) 1973-11-15

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