US3394778A - Lift truck mast assembly - Google Patents

Lift truck mast assembly Download PDF

Info

Publication number
US3394778A
US3394778A US596922A US59692266A US3394778A US 3394778 A US3394778 A US 3394778A US 596922 A US596922 A US 596922A US 59692266 A US59692266 A US 59692266A US 3394778 A US3394778 A US 3394778A
Authority
US
United States
Prior art keywords
ram
uprights
mast
upright
truck
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
US596922A
Other languages
English (en)
Inventor
Caleb J Brinton
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.)
Yale Materials Handling Corp
Original Assignee
Eaton Yale and Towne Inc
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 Eaton Yale and Towne Inc filed Critical Eaton Yale and Towne Inc
Priority to US596922A priority Critical patent/US3394778A/en
Priority to GB26977/67A priority patent/GB1178867A/en
Priority to DE6605077U priority patent/DE6605077U/de
Priority to JP42044469A priority patent/JPS4929661B1/ja
Priority to FR1555619D priority patent/FR1555619A/fr
Application granted granted Critical
Publication of US3394778A publication Critical patent/US3394778A/en
Assigned to YALE MATERIALS HANDLING CORPORATION ROUTE 523 AND 31 FLEMINGTON NEW JERSEY 08822 reassignment YALE MATERIALS HANDLING CORPORATION ROUTE 523 AND 31 FLEMINGTON NEW JERSEY 08822 ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: EATON CORPORATION
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • B66F9/075—Constructional features or details
    • B66F9/08—Masts; Guides; Chains

Definitions

  • ABSTRACT OF THE DISCLOSURE Relates to a mast for a lift truck having a flange member at the upper end of the fixed uprights and at least one ram fixed at its upper end to the flange with the ram piston bearing against a similar flange connected to the upper end of the secondary upright.
  • One end of a chain is fixed to the flange member to counteract the thrust of the ram as it lifts a third upright via a sprocket attached to the upper end of the secondary upright.
  • This invention relates to an industrial or lift truck having extendible uprights, a lifting load carriage and hydraulic ram means for elevating the uprights and load carriage.
  • the lift truck of the present invention utilizes a series of telescoping uprights, more particularly three or more sets of telescoping uprights, which, when extended, permit high lifting of a load while allowing the truck to have relatively low overall height when the uprights are lowered.
  • the load carriage In truck-s of this type it is desirable that the load carriage have substantial free lift, i.e., vertical movement of the load carriage without extension of the uprights. This allows the load carriage to be lifted without increasing the overall height of the truck, thereby permitting operation of the loaded truck in areas of low overhead.
  • the uprights and load carriage can be fully extended to their uppermost position with the shortest possible lift ram.
  • Prior lift truck designs known in the art have utilized lift ram arrangements having relatively long rams and requiring involved mounting schemes for the ram and uprights.
  • Another prime object of the present invention is to provide a new and improved lift truck assembly wherein the assembly includes a load supporting carriage movably mounted on one of said mast sections and separably movable along substantially the whole length of its supporting mast section to thus obtain a full free lift of said load supporting carriage without any extension of the mast upright sections.
  • Another main object of the present invention is to provide an improved lift truck mechanism having vertically disposed telescopic mast uprights with one of said uprights being fixed and the others mounted for relative longitudinal movement and actuated by lifting chains and a lift ram means mounted on a flange integral with said fixed upright in a manner such that the reaction force 3,394,778 Patented July 30, 1968 of said ram means acting on said flange is in part balanced by a lifting chain attached to the flange.
  • Another object of the present invention is to provide a mast assembly which is designed to afford the operator a clear view through the mast assembly and a full unobstructed view around other portions of the vehicle.
  • Another important object of the present invention is to provide a new and novel lift truck device having vertically disposed mast uprights and a hydraulic ram fixed to a first upright at its upper end, a second upright of said lift truck assembly having integral means proximate said ram piston for engagement thereby, said ram being so mounted that its piston moves but a relatively short distance to engagement with said second upright integral member effecting lifting of said second upright.
  • FIGURE 1 is a perspective view of a lift truck constructed in accordance with the present invention, showing the uprights and load carriage in the lowered position;
  • FIGURE 2 is a perspective view similar to that of FIG- URE 1 but showing the uprights and load carriage in an elevated position;
  • FIGURE 3 is a diagrammatic side elevational view of the mast assembly of the present invention showing the mast sections thereof removed from their nested assembly and disposed one in front of the other to more clearly illustrate the inner-connection between the same;
  • FIGURE 4 is -a partial side elevational view showing details of the mast assembly of the present invention with the uprights and load carriage in an elevated position;
  • FIGURE 5 is a sectional view taken on line 5-5 of FIGURE 4;
  • FIGURE 6 is a sectional view taken on line 6-6 of FIGURE 4;
  • FIGURE 7 is a perspective view showing details of the ram cylinder mounting and chain attachment on the fixed upright of the mast assembly of the present invention.
  • the mast assembly of the present invention is designed for use with an industrial or lift truck generally indicated as T in FIGURES 1 and 2.
  • T an industrial or lift truck generally indicated as T in FIGURES 1 and 2.
  • the details of the truck as the transmission, engine, body design, etc., are not a part of the present invention and therefore, are not described in detail.
  • the mast assembly of the present invention is mounted in a generally vertical plane on the front end of the truck T as shown in FIGURES 1 and 2.
  • the rear of the mast assembly of the present invention is provided with suitable bearing blocks 5 and bearing caps 6 (see FIGURE 4) by which the mast assembly is mounted for limited swinging movement relative to the front axle housing of the lift truck; such a mounting arrangement of the mast assembly to provide forward and reverse tilting of the mast assembly is well-known in the lift truck art.
  • the primary upright 10 of the mast assembly is fixedly attached to the bearing blocks 5 as seen in FIGURE 4, and thus, mounted to the front end of the truck T.
  • the primary upright assembly has a pair of channel uprights 10 arranged with the channeled portions facing in an inward direction toward the center of the assembly.
  • the primary uprights are joined at their bottom ends by a plate member 11 and at their upper ends by a U-shaped flange member 12.
  • the plate'member 11 and the U-shaped flange member 12 provide lateral support to the primary uprights 10 although the flange member 12 has a more important function to be described hereinbelow.
  • FIGURES 5 and 6 Mounted within the opposing pair of open face prim-ary uprights 10 are nested pairs of second or secondary uprights 13, third or tertiary uprights 14, and fourth or quad uprights 15 as best seen in FIGURES 5 and 6.
  • the second, third, and fourth pairs of uprights are I-beam shaped in cross-section and disposed in parallel spaced relation and rigidly connected together at their respective ends by bracing members.
  • mast sections 13, 14 and 15 are equipped with rollers 13, 14, and 15' respectively, that ride in the channel of the adjacent I-beam sections.
  • each of the mast sections are substantially identical in length and arranged to be telescoped within one another for a compact structure.
  • the channel shaped primary member is mounted to the truck T.
  • the second or secondary upright 13 is slightly smaller in its dimension than channel shaped member 10 and nested within the primary section and disposed in slightly inwardly spaced relation thereto by means of roller 13' so as to be freely slidable longitudinally therealong.
  • upright members 14 and 15 are arranged in step-like fashion from secondary member 13 and tertiary member 14 respectively, and disposed for relative longitudinal slidable movement by rollers 14' and 15.
  • the stepped arrangement of sections 13, 14 and 15 permits a substantial area of vision through the center of the mast structure for the operator.
  • a load oanriage generally indicated as 21 is supported on the fourth or quad section 15, the carriage having spaced pairs of rollers 22 (see FIGURE 4) which are disposed so as to be rollably engageable with the inwardly facing section of quad mast 15 to advance the load carriage 21 t-herealong.
  • a hydraulic ram 23 is provided for raising or lowering the load carriage 2-1 within its supporting mast section 15 between its fully raised position as shown in FIGURE 2 and its lowermost position as shown in FIGURE 1.
  • the ram cylinder is mounted between the pair of the I- beam members comprising quad section 15 by welding or other suitable means of attachment.
  • the ram cylinder is so mounted on a cross support member 26 which extends between the pairs of upright members comprising quad section 15 in a manner so that the ram piston faces upwardly.
  • a transverse shaft 27 is provided on the upper end of ram piston for mounting thereon a load sheave or roller 28, the particular type mounting of the transfer shaft 27 and sheave 28 on the upper end of the ram piston 25 to be utilized in the present invention is thoroughly described in Patent 2,979,162 issued on April 11, 1961, to the common assignee.
  • the particular mounting of the before-described shaft and sheave on the upper end of the piston ram does not comprise a part of the present invention and thus, will not be described in detail herein.
  • a pair of flexible members such as link chains 32 have one end anchored at 30 to a plate carried by quad section 15, and pass over the sheave 28, extending downwardly and being securely anchored at 31 to the load carriage 21.
  • the before-described movement of the load carriage 21 is accomplished with the mast assembly in its collapsed condition, as seen in FIGURE 1, and is referred to in the art as the full free lift of the load carriage.
  • Such free lift is highly desirable to permit operation of the lift truck in areas of low overhead in carrying loads in some intermediate position along the length of quad mast 15 without any extension of the mast assembly from its collapsed height.
  • a pair of secondary hydraulic rams are disposed rearwardly of the primary ram 23 and in such manner to have their cylinder upper ends mounted to the before-described flange member 12 which interconnects the upper ends of primary uprights 10.
  • the secondary ram cylinders 42 are provided with a flange 41 at their upper ends which is connected to the underside of the primary upright flange member 12 by bolt means. Such a mounting of the ram cylinders at their upper end permits their lower ends 43 to be unsupported which is important for reasons to be set forth hereinbelow.
  • the particular mounting of the instant invention does not require a plate or support memher for receiving the lowermost ends 43 of ram cylinder 42, thus permitting a ram cylinder length of the full 'height of the primary upright 10.
  • the ram cylinder 42 does not extend for the full length of the primary upright 10 as shown in FIGURE 4, but terminates at its end 43 adjacent bearing blocks 5.
  • the secondary ram cylinders 42 for effecting uplifting of the mast uprights, are mounted in the side areas of the lift truck adjacent the primary or fixed upright.
  • This novel mounting arrangement of the secondary ram cylinders of the present invention permits a more open line of sight vision for the operator in the central area of the lift truck over corresponding mounting arrangements in the lift truck prior art.
  • Bracing member 50 has a U-shaped configuration with side bearing portions 51 secured to the secondary uprights 13.
  • the bearing portions 51 of bracing member 50 are positioned closely adjacent the upper end of secondary ram pistons 44.
  • a pair of flexible members, such as link chains 55 are provided each of which are secured at their one end to the ram cylinder flange 41 at 54 and extend over a sheave 56 carried by the secondary upright 13 and are secured at their other end at anchor plate 57 secured to the lower portion of the third or tertiary upright 14 as seen in FIGURES 3 and 4.
  • Another pair of flexible members as link chains 60 are provided having their one end secured by anchor means 61 attached to bracing member 50 and extending over sheave or roller 62 mounted on the third or tertiary section 14, with their other end being connected to anchor plate 63 secured to the lower portion of the quad or fourth upright 15 as seen in FIGURES 3 and 4.
  • the quad or fourth mast is also raised, the velocity of this latter movement being subtantially three times the speed of the aforesaid movement of the piston ram 44 due to the reaving arrangement of the link chains 60 described hereinabove.
  • the secondary ram 44 is approximately as long as; the mast sections of the assembly and through the above-described reaving arrangement is effective upon actuation to extend said assembly a distance equal to at least approximately three times the height of any one of said mast sections.
  • the secondary uprights may weave or move relative to the ram pistons without affecting the operation of the ram pistons or the relation of the pistons to the secondary ram cylinders.
  • the primary and secondary rams 23 and 40 respectively are each preferably of the single action type as referred to in the art, being actuated by hydraulic fluid to raise the load carriage 21 and the several mast sections 13, 14 and of the above-described assembly, the rams upon being drained of their actuating fluid permitting said elements to return gravitationally to their lowered and collapsed positions respectively, as illustrated in FIGURE 1. It is desirable to connect the primary and secondary rams 23 and 40 into a single hydraulic control circuit (not shown) which may be manually operable at the usual operator station on the lift truck, whereby hydraulic fluid is supplied simultaneously to each of said rams.
  • the primary ram 23 is preferably larger in diameter than the secondary ram 40, whereby the primary ram is actuated at a somewhat lower hydraulic pressure than the secondary ram, it being intended that for any one mast assembly the primary ram 23 is actuable so as to raise the load carriage in the manner above described to its full free lift position prior to the secondary ram 40 being actuated to begin to raise some mast sections of said assembly.
  • the ram sizes are such that they permit the mast sections to move to their fully collapsed position of FIGURE 1 prior to the hydraulic pressure being lowered sufficiently in the primary ram 23 to initiate the lowering movement of the load carriage.
  • primary and secondary rams of equal or of desired different sizes to control the sequence of movement for the respective load carriage and mast sections of the assembly.
  • the instant mast assembly may be provided with conventional latching means to retain the mast sections in their collapsed position during the free lift movement of the load carriage and to retain the load carriagein its uppermost free lift position during collapsing of the mast section; such latch means for retaining the respective load carriage and mast sections in their desired positions being conventional and not forming a part of the instant invention are not described in detail herein.
  • a lifting mast having fixed uprights and movable uprights mounted forwardly of said fixed uprights for movement relative to said fixed uprights, a lift ram for actuating said movable uprights, a flange member fixed to the upper end of said fixed uprights and extending rearwardly of said fixed uprights, the upper end of said ram being rigidly secured to and suspended from said fixed flange member, said movable uprights including secondary uprights mounted for movement on said fixed uprights, a bearing portion fixed to the upper end of said secondary uprights and extending in overlying relationship to said lift ram, said ram bearing against said bearing portion to actuate said secondary uprights.
  • said movable uprights include tertiary uprights mounted for movement on secondary uprights and a flexible memher is fixed at one end to said flange member and at its other end to said tertiary uprights, a guide means for said flexible member mounted on said secondary uprights, the said flexible member applying a force to said flange member opposite in direction to the reaction force of said ram on said flange member.
  • said movable uprights include secondary uprights mounted for movement on said primary uprights and tertiary uprights movably mounted on said secondary uprights, a bearing portion fixed to the upper end of said secondary uprights and extending in overlying relationship to each 7 of said rams, said rams bearing against said bearing portion to actuate said secondary uprights.
  • said movable uprights include tertiary uprights mounted for movement on secondary uprights, a pair of flexible members are each fixed at one end to said flange member and at the other end to said tertiary uprights, a guide means for said flexible member mounted on said secondary uprights, the said flexible members applying a force to said flange member opposite in direction to the reaction force of each ram on said flange member.

Landscapes

  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Conveying And Assembling Of Building Elements In Situ (AREA)
US596922A 1966-11-25 1966-11-25 Lift truck mast assembly Expired - Lifetime US3394778A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US596922A US3394778A (en) 1966-11-25 1966-11-25 Lift truck mast assembly
GB26977/67A GB1178867A (en) 1966-11-25 1967-06-12 Lift Truck Mast Assembly
DE6605077U DE6605077U (de) 1966-11-25 1967-07-11 Hubmast fuer hublader
JP42044469A JPS4929661B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1966-11-25 1967-07-12
FR1555619D FR1555619A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1966-11-25 1967-09-08

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US596922A US3394778A (en) 1966-11-25 1966-11-25 Lift truck mast assembly

Publications (1)

Publication Number Publication Date
US3394778A true US3394778A (en) 1968-07-30

Family

ID=24389286

Family Applications (1)

Application Number Title Priority Date Filing Date
US596922A Expired - Lifetime US3394778A (en) 1966-11-25 1966-11-25 Lift truck mast assembly

Country Status (5)

Country Link
US (1) US3394778A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
JP (1) JPS4929661B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (1) DE6605077U (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
FR (1) FR1555619A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
GB (1) GB1178867A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Cited By (37)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3612221A (en) * 1969-09-04 1971-10-12 Raymond Corp Lift truckload carriage safety device
JPS4712659U (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * 1971-03-13 1972-10-14
US3934681A (en) * 1974-04-12 1976-01-27 Baker-Roos Overhead service unit
US4219302A (en) * 1978-02-13 1980-08-26 Towmotor Corporation Cylinder arrangement for raising a carriage and uprights of a mast
DE3013286A1 (de) * 1979-04-09 1980-10-23 Clark Equipment Co Hubmast
JPS55140492A (en) * 1979-04-09 1980-11-01 Clark Equipment Co Mast device for lift truck
US4261438A (en) * 1979-07-18 1981-04-14 Cascade Corporation Lift truck mast having high visibility and extensibility
US4310072A (en) * 1979-12-17 1982-01-12 Clark Equipment Company Fluid line coupling for fluid actuated extensible structure
US4325464A (en) * 1979-03-09 1982-04-20 Kalmar Last Maskin Verkstad Ab Lifting stand of a motor-driven truck
US4355703A (en) * 1979-03-08 1982-10-26 Clark Equipment Company Upright for lift truck
US4356893A (en) * 1980-04-14 1982-11-02 Towmotor Corporation Load lifting carriage and mast assembly
US4365693A (en) * 1982-08-30 1982-12-28 Towmotor Corporation High visibility lift apparatus
US4369861A (en) * 1980-11-10 1983-01-25 Allis-Chalmers Corporation Multiple section mast with a pair of lift jacks behind the primary section uprights
US4374550A (en) * 1977-10-17 1983-02-22 Clark Equipment Company Upright for lift truck
US4401191A (en) * 1977-10-17 1983-08-30 Clark Equipment Company Upright for lift truck
WO1983003406A1 (en) * 1982-03-22 1983-10-13 Macnab, John, E. Lift mast assembly
US4421208A (en) * 1981-02-09 1983-12-20 Clark Equipment Company Upright fork lift truck
US4432438A (en) * 1981-02-09 1984-02-21 Clark Equipment Company Upright for lift truck
WO1984001765A1 (en) * 1982-10-25 1984-05-10 Bushnell Sherman W Jr Lift
US4476960A (en) * 1982-08-09 1984-10-16 Towmotor Corporation Adjustable chain anchor for lift trucks
US4491196A (en) * 1981-09-23 1985-01-01 Albert Bocker Gmbh & Co. Kg Telescopic beam
US4505635A (en) * 1978-08-17 1985-03-19 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Load lifting unit for a lift truck
US4506764A (en) * 1981-10-22 1985-03-26 Firma Jungheinrich Unternehmensverwaltung Kg Lift truck
US4593791A (en) * 1984-04-17 1986-06-10 Allis-Chalmers Corporation Automatic sequencing circuit for lift cylinders
US4703834A (en) * 1984-09-14 1987-11-03 Linde Aktiengesellschaft Multiply extensible lift frames
US4721187A (en) * 1987-03-23 1988-01-26 The Raymond Corporation Lift truck mast structure
US4762203A (en) * 1987-06-25 1988-08-09 The Raymond Corporation Lift truck lowering system
US5586619A (en) * 1994-11-25 1996-12-24 Young; Roland O. Lifting apparatus
US6505710B1 (en) * 1997-10-14 2003-01-14 Nissan Motor Co., Ltd. Mast apparatus for fork lift trucks
US20050133311A1 (en) * 2003-11-10 2005-06-23 Linde Aktiengesellschaft Lifting framework for an industrial truck
US20060027094A1 (en) * 2004-05-06 2006-02-09 Jungheinrich Aktiengesellschaft Industrial truck having a piston/cylinder arrangement and improved cylinder mounting
US20060151249A1 (en) * 2004-09-23 2006-07-13 Kluver Leroy M Materials handling vehicle having substantially all hydraulic components mounted on a main frame assembly
US7096999B2 (en) 2003-08-05 2006-08-29 The Raymond Corporation Mast construction for a lift truck
US20070221450A1 (en) * 2006-03-22 2007-09-27 Tomonori Futamura Mast assembly in forklift truck
US20080217109A1 (en) * 2007-03-08 2008-09-11 Jungheinrich Aktiengesellschaft Bearing assembly for lift chain rollers in a multiple lift mast for high-lift fork trucks
RU212857U1 (ru) * 2022-01-12 2022-08-11 Публичное акционерное общество "Машиностроительный завод имени М.И. Калинина, г. Екатеринбург" Подъемный механизм штабелера
EP4414316A1 (en) 2023-02-08 2024-08-14 L.T.E. Lift Truck Equipment S.p.A. Lift truck upright

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2206267B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * 1972-11-10 1976-08-20 Braud & Faucheux
MX147688A (es) * 1977-10-17 1983-01-05 Clark Equipment Co Mejoras en estructura de montante para carretillas elevadoras de carga
DE2926657A1 (de) 1979-07-02 1981-01-15 Jungheinrich Kg Hubmast fuer hublader
DE19516416B4 (de) * 1995-05-04 2005-11-24 Still Gmbh Flurförderzeug mit einem Hubgerüst

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2250321A (en) * 1940-02-12 1941-07-22 Moto Sway Corp Vehicle lifting and vibrating device
US2581791A (en) * 1949-06-18 1952-01-08 Shepard Co Lewis Industrial lift truck
US2582999A (en) * 1949-05-18 1952-01-22 Baker Raulang Co Industrial truck
US2877868A (en) * 1956-05-31 1959-03-17 Multi Lift Co Hydraulic lift for industrial trucks and tractors
US2915143A (en) * 1953-10-23 1959-12-01 Simmons Ind Inc Automobile lift
US2979162A (en) * 1957-01-28 1961-04-11 Yale & Towne Mfg Co Upright assembly for industrial trucks
CA659933A (en) * 1963-03-26 E. Mitchell Maurice Mobile service equipment for overhead utility equipment
US3208556A (en) * 1962-02-19 1965-09-28 Towmotor Corp Multiple stage masts for lift trucks
US3338335A (en) * 1966-05-13 1967-08-29 Otis Elevator Co Latch mechanism for lift trucks

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA659933A (en) * 1963-03-26 E. Mitchell Maurice Mobile service equipment for overhead utility equipment
US2250321A (en) * 1940-02-12 1941-07-22 Moto Sway Corp Vehicle lifting and vibrating device
US2582999A (en) * 1949-05-18 1952-01-22 Baker Raulang Co Industrial truck
US2581791A (en) * 1949-06-18 1952-01-08 Shepard Co Lewis Industrial lift truck
US2915143A (en) * 1953-10-23 1959-12-01 Simmons Ind Inc Automobile lift
US2877868A (en) * 1956-05-31 1959-03-17 Multi Lift Co Hydraulic lift for industrial trucks and tractors
US2979162A (en) * 1957-01-28 1961-04-11 Yale & Towne Mfg Co Upright assembly for industrial trucks
US3208556A (en) * 1962-02-19 1965-09-28 Towmotor Corp Multiple stage masts for lift trucks
US3338335A (en) * 1966-05-13 1967-08-29 Otis Elevator Co Latch mechanism for lift trucks

Cited By (50)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3612221A (en) * 1969-09-04 1971-10-12 Raymond Corp Lift truckload carriage safety device
JPS4712659U (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * 1971-03-13 1972-10-14
US3934681A (en) * 1974-04-12 1976-01-27 Baker-Roos Overhead service unit
US4401191A (en) * 1977-10-17 1983-08-30 Clark Equipment Company Upright for lift truck
US4374550A (en) * 1977-10-17 1983-02-22 Clark Equipment Company Upright for lift truck
US4219302A (en) * 1978-02-13 1980-08-26 Towmotor Corporation Cylinder arrangement for raising a carriage and uprights of a mast
US4657471A (en) * 1978-08-17 1987-04-14 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Load lifting unit for a lift truck
US4505635A (en) * 1978-08-17 1985-03-19 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Load lifting unit for a lift truck
US4356891A (en) * 1979-03-08 1982-11-02 Clark Equipment Company Upright for lift truck
US4355703A (en) * 1979-03-08 1982-10-26 Clark Equipment Company Upright for lift truck
US4325464A (en) * 1979-03-09 1982-04-20 Kalmar Last Maskin Verkstad Ab Lifting stand of a motor-driven truck
JPS55140492A (en) * 1979-04-09 1980-11-01 Clark Equipment Co Mast device for lift truck
DE3013286A1 (de) * 1979-04-09 1980-10-23 Clark Equipment Co Hubmast
US4261438A (en) * 1979-07-18 1981-04-14 Cascade Corporation Lift truck mast having high visibility and extensibility
US4310072A (en) * 1979-12-17 1982-01-12 Clark Equipment Company Fluid line coupling for fluid actuated extensible structure
US4356893A (en) * 1980-04-14 1982-11-02 Towmotor Corporation Load lifting carriage and mast assembly
US4369861A (en) * 1980-11-10 1983-01-25 Allis-Chalmers Corporation Multiple section mast with a pair of lift jacks behind the primary section uprights
US4421208A (en) * 1981-02-09 1983-12-20 Clark Equipment Company Upright fork lift truck
US4432438A (en) * 1981-02-09 1984-02-21 Clark Equipment Company Upright for lift truck
US4491196A (en) * 1981-09-23 1985-01-01 Albert Bocker Gmbh & Co. Kg Telescopic beam
US4506764A (en) * 1981-10-22 1985-03-26 Firma Jungheinrich Unternehmensverwaltung Kg Lift truck
WO1983003406A1 (en) * 1982-03-22 1983-10-13 Macnab, John, E. Lift mast assembly
US4476960A (en) * 1982-08-09 1984-10-16 Towmotor Corporation Adjustable chain anchor for lift trucks
US4365693A (en) * 1982-08-30 1982-12-28 Towmotor Corporation High visibility lift apparatus
US4458785A (en) * 1982-10-25 1984-07-10 Bushnell Jr Sherman W Lift
WO1984001765A1 (en) * 1982-10-25 1984-05-10 Bushnell Sherman W Jr Lift
US4593791A (en) * 1984-04-17 1986-06-10 Allis-Chalmers Corporation Automatic sequencing circuit for lift cylinders
US4703834A (en) * 1984-09-14 1987-11-03 Linde Aktiengesellschaft Multiply extensible lift frames
US4721187A (en) * 1987-03-23 1988-01-26 The Raymond Corporation Lift truck mast structure
US4762203A (en) * 1987-06-25 1988-08-09 The Raymond Corporation Lift truck lowering system
US5586619A (en) * 1994-11-25 1996-12-24 Young; Roland O. Lifting apparatus
US6505710B1 (en) * 1997-10-14 2003-01-14 Nissan Motor Co., Ltd. Mast apparatus for fork lift trucks
US7096999B2 (en) 2003-08-05 2006-08-29 The Raymond Corporation Mast construction for a lift truck
US7984793B2 (en) * 2003-08-05 2011-07-26 The Raymond Corporation Mast construction for a lift truck
US20110048860A1 (en) * 2003-08-05 2011-03-03 Robert Lewis Lift Truck With Mast
US20080196976A1 (en) * 2003-08-05 2008-08-21 Robert Lewis Mast construction for a lift truck
US7398859B2 (en) 2003-08-05 2008-07-15 The Raymond Corporation Mast construction for a lift truck
US7407038B2 (en) * 2003-11-10 2008-08-05 Linde Material Handling Gmbh Lifting framework for an industrial truck
US20050133311A1 (en) * 2003-11-10 2005-06-23 Linde Aktiengesellschaft Lifting framework for an industrial truck
US7340989B2 (en) 2004-05-06 2008-03-11 Jungheinrich Aktiengesellschaft Industrial truck having a piston/cylinder arrangement and improved cylinder mounting
US20060027094A1 (en) * 2004-05-06 2006-02-09 Jungheinrich Aktiengesellschaft Industrial truck having a piston/cylinder arrangement and improved cylinder mounting
US7610977B2 (en) * 2004-09-23 2009-11-03 Crown Equipment Corporation Lift truck having hydraulically separate main frame and power unit assembly
US20060151249A1 (en) * 2004-09-23 2006-07-13 Kluver Leroy M Materials handling vehicle having substantially all hydraulic components mounted on a main frame assembly
US7523808B2 (en) * 2006-03-22 2009-04-28 Kabushiki Kaisha Toyota Jidoshokki Mast assembly in forklift truck
US20070221450A1 (en) * 2006-03-22 2007-09-27 Tomonori Futamura Mast assembly in forklift truck
US20080217109A1 (en) * 2007-03-08 2008-09-11 Jungheinrich Aktiengesellschaft Bearing assembly for lift chain rollers in a multiple lift mast for high-lift fork trucks
US8424649B2 (en) 2007-03-08 2013-04-23 Jungheinrich Aktiengesellschaft Bearing assembly for lift chain rollers in a multiple lift mast for high-lift fork trucks
RU212857U1 (ru) * 2022-01-12 2022-08-11 Публичное акционерное общество "Машиностроительный завод имени М.И. Калинина, г. Екатеринбург" Подъемный механизм штабелера
EP4414316A1 (en) 2023-02-08 2024-08-14 L.T.E. Lift Truck Equipment S.p.A. Lift truck upright
WO2024165969A1 (en) * 2023-02-08 2024-08-15 L.T.E. Lift Truck Equipment S.P.A. Lift truck upright

Also Published As

Publication number Publication date
DE6605077U (de) 1970-04-16
JPS4929661B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1974-08-06
FR1555619A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1969-01-31
GB1178867A (en) 1970-01-21

Similar Documents

Publication Publication Date Title
US3394778A (en) Lift truck mast assembly
US3208556A (en) Multiple stage masts for lift trucks
US3202242A (en) Industrial truck with an elevatable operator platform that is movable with and relative to the load handling means
US3172500A (en) Load-lifting trucks
US3688931A (en) Straddle truck for containers
US3786902A (en) Load-lifting mechanism for a lift truck
JPH06227798A (ja) リフトトラック及びこのリフトトラック用の伸縮自在のマスト構造体並びにこのマスト構造体の操作運動を制御するための方法
US3127956A (en) Lift truck
US4219302A (en) Cylinder arrangement for raising a carriage and uprights of a mast
US2877868A (en) Hydraulic lift for industrial trucks and tractors
US4355703A (en) Upright for lift truck
US4356891A (en) Upright for lift truck
US3727781A (en) Lift truck load lifting mechanism
US4325464A (en) Lifting stand of a motor-driven truck
IL23417A (en) Triple stage upright for lift truck
US4374550A (en) Upright for lift truck
US3077951A (en) Lift truck mast operation sequence mechanism
US2514052A (en) Industrial truck
US2747689A (en) Tier lift truck
US3709393A (en) Lift truck mast
US3235034A (en) Triple lift truck with continuous lift chain
US4238004A (en) Hidden chain assembly for lift truck mast
US4280592A (en) Full free-lift upright for lift truck
FI68600C (fi) Trippelstativ foer gaffeltruckar
US4312427A (en) Extra lift mast for lift trucks

Legal Events

Date Code Title Description
AS Assignment

Owner name: YALE MATERIALS HANDLING CORPORATION ROUTE 523 AND

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:EATON CORPORATION;REEL/FRAME:004261/0903

Effective date: 19831231