US3759409A - Crane - Google Patents

Crane Download PDF

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Publication number
US3759409A
US3759409A US00121050A US3759409DA US3759409A US 3759409 A US3759409 A US 3759409A US 00121050 A US00121050 A US 00121050A US 3759409D A US3759409D A US 3759409DA US 3759409 A US3759409 A US 3759409A
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United States
Prior art keywords
crane
elements
portals
cylinder
traverse
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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
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US00121050A
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English (en)
Inventor
J Wenzel
H Rieschel
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.)
HAAMANN FREUDENBERGER J HEBEZE
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HAAMANN FREUDENBERGER J HEBEZE
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Priority claimed from DE19702010945 external-priority patent/DE2010945C/de
Application filed by HAAMANN FREUDENBERGER J HEBEZE filed Critical HAAMANN FREUDENBERGER J HEBEZE
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Publication of US3759409A publication Critical patent/US3759409A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D90/00—Component parts, details or accessories for large containers
    • B65D90/12—Supports
    • B65D90/18—Castors, rolls, or the like; e.g. detachable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C19/00—Cranes comprising trolleys or crabs running on fixed or movable bridges or gantries
    • B66C19/007—Cranes comprising trolleys or crabs running on fixed or movable bridges or gantries for containers

Definitions

  • a gantry or portal crane has two longitudinally spaced portals which are connected by longitudinally extending structural members to form therewith a selfsupporting structure.
  • the lower ends of the uprights of the portals are provided with wheels which can be swung to a lower position engaging the ground and an upper position removed from the ground in which the lower ends of the portals rest directly on the ground.
  • the upper ends of the portals are provided with traverse members each carrying two transversely spaced hydraulic and cylinder piston units which are connected for universal pivoting movement to them, and which are provided at their free ends with engaging portions for engaging a load.
  • a hydraulic system is provided utilizing four separate hydraulic circuits each connected with one of the cylinder and piston units, a central control by means of which all of the cylinder and piston units can be operated in unison, and individual control valves located on the uprights of the portals by means of which each of these cylinder and piston units can be individually operated.
  • the present invention relates generally to a lifting apparatus, and more particularly to a crane. Still more particularly, the present invention relates to a gantry or portal crane.
  • Cranes of this type are already known. They utilize two longitudinally spaced portals which are connected by structural members extending between them and uniting them into a self-supporting structure. The uprights of the portals are provided with wheels or rollers so that when the crane engages a load, it can be displaced from one location to another to which it is intended to deliver the load.
  • This latter feature poses a problem, because due to the forces acting upon the crane during such displacement, resulting both from the load the crane carries and also from stresses originating on uneven surfaces over which it must move, these known cranes are exceedingly massive and strong in their construction and therefore cumbersome. They are, and necessarily must be, provided with a central hydraulic system which acts both upon the drive,
  • An additional object of the present invention is to provide such an improved crane which can be operated in a simple manner and which requires less and simpler servicing than was known heretofore.
  • An additional object is to provide such an improved crane which can more readily be used in different situations and which can be transported more easily than those known.
  • a concomitant object is to provide such an improved crane which can be controlled by a single operator despite its own size and the size and weight of loads which it is capable of handling.
  • a crane comprising a pair of longitudinally spaced portals each having at least two uprights provided with upper end portions connected by a traverse, and with lower end portions.
  • Longitudinally extending structural members connect the portals to form therewith a self-supporting structure and displacing means at the lower end portions is provided for displacing the structure along the ground.
  • At least a pair of load-engaging elements are pivotably connected to and depend from each traverse and these elements each comprise a hydraulic cylinder connected to the respective traverse, a piston displaceable on the cylinder and having an outwardly projecting piston rod provided with a free end, and an engaging portion on the free end for engaging a load.
  • the novel crane comprises a hydraulic circuit for the elements including a plurality of hydraulic circuits each associated with one of the elements, central control means associated with all of these circuits for operating all of the elements in unison, and individual control means each associated with one of these circuits for operating the elements individually.
  • a crane constructed in accordance with the present invention overcomes the disadvantages outlined above with respect to the prior art. It also achieves the advantages which have been set forth as desirable, and in particular it makes possible the handling of largedimensioned and heavy loads under the control of only a single operator. This is highly advantageous, not only because it avoids the expense involved in having a second operator connect and disconnect the load from the crane, but also in that it avoids the danger to such a second operator which exists where a crane is centrally controlled by the first operator and where the second operator can communicate with the first operator at the central control stand only by shouting whereas visual communication may often be completely lacking, for instance if the crane engages large-dimensioned containers which block the view.
  • the individual control means is preferably provided within ready reach of the engaging portions on the free end of the respective piston rods, so that the operator can manipulate the engaging portion of a given piston rod with one hand, and control the cylinder and piston unit with which the piston rod is associated,'with the other hand.
  • the individual control means will advantageously be located on the: uprights of the respective portals. They will usually be in form of control valves interposed in the hydraulic circuit associated with the respective cylinder and piston unit.
  • the cylinder and piston units utilized according to the present invention are pivoted for universal movement, for instance by means of ball-joint connections.
  • the use of hydraulically controlled cylinder and piston units in itself is not novel, but it is known from the prior art only to use them individually or to mount them at the four corners of a load-lifting structure where they are always engaged at one and the same point.
  • the utilization of a universal pivot mount has not heretofore been proposed.
  • FIG. 1 is a diagrammatic perspective view illustrating a crane, according to the present invention, with a load in lifted condition;
  • FIG. 2 is a side view of a further embodiment
  • FIG. 3 shows the embodiment of FIG. 2 in a telescoped condition
  • FIG. 4 is an enlarged detailed view of FIG. 2, seen from the left-hand side thereof;
  • FIG. 5 is an enlarged detailed view illustrating the wheel mount of the crane according to the present invention in a position in which the wheel is ready for displacement of the crane;
  • FIG. 6 is a viewsimilar to FIG. 5 but illustrating the wheel mount in a position in which the crane rests on the lower end portions of the uprights in the portals.
  • FIG. 1 DESCRIPTION OF THE PREFERRED EMBODIMENTS Discussing now the drawing in detail, and firstly the embodiment illustrated in FIG. 1, it will be seen that the crane shown there is a crane construction of light steel tubes which, however, are sufficiently strong for lifting and operating purposes.
  • the crane has two portals which are longitudinally spaced and which each have two upright posts 1 and a traverse 2 connecting the upper end portions.
  • the portals are connected by longitudinally extending structural members 3,3 which in turn are connected by diagonal braces 4.
  • a control platform or gondola S is suspended from one of the structural members 3 so as to be located closely above the ground and carries a seat 6 for an operator and a central hydraulic control unit 7 including the not separately illustrated hydraulic pump and drive therefor.
  • each of the transverses 2 has connected to it by means of known ball and socket joints two hydraulically operable cylinder andpiston units 8.
  • these units 8 can be universally pivoted which makes it possible to move the connecting elements 82 provided at the free end portions of their piston rods 81 to various different locations, making it possible to engage the load 10 which is shown in FIG. 1 in broken lines at different locations depending upon individual requirements.
  • the portals are spaced from one another longitudinally by a distance of 6 meters, the units 8 can engage the load 10 at different locations within the range of 5 and 7.5 meters.
  • the hydraulic system for raising or lowering the load 10 utilizes four independent hydraulic circuits each of which is associated with one of the units 8. This assures that the units 8 cannot influence one another, for instance, as a result of differential loading. Each of these circuits can be controlled from the central control, so that all of the units 8 can be controlled and operated in unison.
  • each of the units 8 can be indi' vidually controlled, for which purpose there is located within reach of the operator of the respective piston rod 81 -preferably, and as illustrated in FIG. 1 on the upright 1 adjacent to the respective unit 8 is mounted an individual control valve 78 which is interposed in the associated circuit and permits raising or lowering of the piston and piston rod to make it possible for the operator to engage the engaging portion 82 at a desired location of the load 10.
  • an individual control valve 78 which is interposed in the associated circuit and permits raising or lowering of the piston and piston rod to make it possible for the operator to engage the engaging portion 82 at a desired location of the load 10.
  • the cylinders 8 will all operate in unison and entirely equally, and the speed of lowering will advantageously be maintained constant via flow-limiting valves of known construction.
  • the individual control valves 78 make it possible to operate the units 8 rapidly for extending or retracting the piston rods when the units 8 are not connected with a load or when they are connected only with a light load.
  • each of the uprights 1 is provided with a wheel 9 which is tumably joumalled in a bifurcated mounting member 91.
  • the mounting members 91 in turn are pivotably connected, as shown by comparison of FIGS. 5 and 6, via an arm 92 to member 11 secured to the lower end portion of the respective upright l.
  • the member 11 may for instance be welded to the respective upright l and the latter are each provided with a base plate 12.
  • a traversely positioned hydraulic cylinder 71 In each of the uprights 1 there is mounted a traversely positioned hydraulic cylinder 71, the piston rod 711 of which abuts against the arm 92 as shown in FIG.
  • Hydraulic motors 71 with associated gear drives are provided for driving the wheels of one of the portals and it is advantageous that the construction of these drives is such that the crane can negotiate the commonly-used ramps having an incline of 14.
  • hydraulic brakes (not illustrated) which are so dimensioned that they can reliably hold the device under operating circumstances.
  • the hydraulic system When the crane is to be moved on its wheels, the hydraulic system is switched to drive mode in which one of the the four independent hydraulic circuits acts to supply the cylinders 71 and the non-illustrated steering mechanism.
  • the remaining three circuits can be individually or jointly switched for supplying the hydraulic motors 73 and this makes it possible to obtain three different drives speeds within which by suitable drive control the speed can be continuously varied.
  • the location of the central control means 7 on the gondola 5 has an additional advantage beyond those mentioned earlier, namely that the entire gondola with the control unit, as well as the pump and the drive therefor, can be constructed as a unit and can be replaced in case of necessity. Also, this construction facilitates maintenance work.
  • the cylinder and piston units which normally lift the load, and which as previously pointed out are universally mounted by means of ball and socket joints or the like, are constructed as doubleacting cylinder and piston units capable of providing both push and pull action.
  • sections can be provided which can be connected with the free ends of the piston rods of these units, and the cylinders of the units can be arrested in upright position by being secured to the upper end portions of the respectively associated uprights of the portals.
  • This construction makes it unnecessary to provide separate hydraulic means for moving the portal uprights from the transport position because the piston rods, extended by the extending sections, can now bear against the ground when their associated pistons are operated, thereby causing the uprights which of course in this construction consist of telescopical sectionsto be upwardly extended or telescoped apart. Once they have reached the desired extended positions, the telescopic sections of the uprights are then arrested with reference to one another and the cylinders can be retracted and the extending sections removed so that the cylinders will now be used for engaging a load in the manner discussed earlier.
  • the traverses in such a construction may also be made telescopic in that each is provided with a separate cylinder and piston unit, the cylinder of which is connected with one and the piston or piston rod of which is connected with the other telescopic section of the respective traverse, so that the traverses may be shortened or lengthened in dependence upon operation of the respectively associated cylinder and piston unit.
  • the filled cylinder chamber that is the cylinder chamber filled with fluid, here eliminates the need for a separate mechanical arresting arrangement for arresting the telescopic sections of the traverses in desired position. It is advantageous to have the traverses be connected with the upper ends or laterally thereof of the uprights,
  • the portals may be made both narrower and lower, and when the unit has been transported to the location where it is to be used, the portals can then be restored to their original size.
  • the posts of the portals can be telescoped apart while the units are stationary, and the traverses may be telescoped apart while the unit moves slowly on its wheels.
  • the unit can move on its own wheels, driven by its own drive, both as its various components are telescoped apart and as they are telescoped together to reduce the size of the unit. It can thus move onto and off conventional ramps, including to and from a transporter which may be used for transporting the unit over substantial distances where moving of the unit under its own drive would not be practicable.
  • each portal is each composed of two telescopic sections 1 and 1 and the traverse of two telescopical sections 2 and 2.
  • the sections are preferably of quadratic or rectangular cross section.
  • the longitudinally extending structuralmembers are not telescoped and are again identified with reference numerals 3 and 3', being connected by the diagonal braces 4.
  • the control gondola is again identified with reference numeral 5 and has the seat 6,'being provided with the drive 51 for a hydraulicpump 52 and the central control means 7.
  • a hydraulic cylinder 22 is accommodated in the telescopic sections 2,2 of a traverse and has a piston rod 221 which is connected with one section and a cylinder 222 which is connected with the other section of the traverse.
  • the unit 22 can be activatedfrom the gondola 5 as shown in FIG. 4. After its piston rod 221 is extended from the cylinder, fluid flow is blocked and the fluid-filled cylinder chamber makes it unnecessary to provide mechanical arresting means for arresting the sections 2,2 against other telescopic movement.
  • the crane is advanced on its wheels over a short distance, and during this time the necessary telescoping action is carried out.
  • the uprights composed of the sections 1,1 are telescoped by means of the hydraulic cylinder and piston units 8' which replace the units 8 of the preceding figures.
  • the units 8 are of the double-acting typeand their cylinders can be arrested at the upper end portions of the sections 1 by means of arresting means 13.
  • Extending sections83 are releasably secured to the connecting portions 82 on the pistonrods 81 and, when fluid is now supplied to the cylinders, the piston rods 81 move downwardly until the extending sections abut against the ground, thereby raising the traverse 2,2 with the upper sections 1 with reference to the lower sections 1', that is telescoping the upper sections out of the lower sections 1'.
  • the sections 1,1 are mechanically connected with one another in suitable manner which does not in itself form a part of the present invention, and the device is now ready for use.
  • FIG. 2 the crane according to the embodiment of FIGS. 2-4, is shown supported on its uprights and holding the lifted load 10.
  • FIG. 3 the crane is shown in telescoped collapsedcondition rolling onto a flatbed 101 up a ramp 100 with its wheels 9 and under the action of its own drive.
  • a crane comprising a pair of longitudinally spaced portals each having at least two uprights provided with upper end portions connected by a traverse, and with lower end portions; longitudinally extending structural members connecting said portals to form therewith a self-supporting structure; displacing means at said lower end portions for displacing said structure along the ground; at least a pair of load-engaging elements pivotably connected to and depending from each traverse, said elements each comprising a hydraulic cylinder connected to the respective traverse, a piston displaceable in said cylinder and having an outwardly projecting piston rod provided with a free end, and an engaging portion on said free end for engaging a load; and a hydraulic system for said elements, comprising a plurality of hydraulic circuits each associated with one of said elements, central control means associated with all of said circuits for operating all of said elements in unison, and individual control means comprising individualvalves each located on one of said uprights and interposed in said circuits for operating said elements indiv'idually.
  • said hydraulic system further comprising a pump, and a drive for said pump; and a control platform suspended from at least one of said structural members intermediate said portals and located proximal to the ground, said control platfonn supporting thereon said pump, drive and central control means of said hydraulic system.
  • a crane as defined in claim I, said displacing means comprising a plurality of wheel units.
  • each of said wheel units comprising a bifurcated wheel support, pivot means mounting the respective wheel support to one of said lower end portions for vertical movement about a pivot axis, andat least one wheel mounted in the respective bifurcated wheel support.
  • a crane comprising a pair of longitudinally spaced portals each having at least two uprights provided with upper end portions connected by a traverse, and with lower end portions; longitudinally extending structural members connecting said portals to form therewith a self-supporting structure; displacing means at said lower end portions for displacing said structure along the ground; at least a pair of load-engaging elements pivotably connected to and depending from each traverse, said elements each comprising a double-acting hydraulic cylinder connected to the respective traverse, a piston displaceable in said cylinder and having an outwardly projecting piston rod provided with a free end, and an enegaging portion on said free end for engaging a load; a hydraulic system for said elements, comprising a plurality of hydraulic circuits each associated with one of said elements, central control means associated with all of said circuits for operating all of said elements in unison, and individual control means each associated with one of said circuits for operating said elements individually; arresting means for arresting said cylinders in upright orientation; and extension sections connectable
  • each traverse is composed of at least two telescopable tubular sections.
  • said displacing means comprising a plurality of wheel units each having a bifurcated wheel support pivotably mounted to one of said lower end portions for vertical movement about a pivot axis, at least one wheel mounted in said wheel support, and a hydraulic cylinder and piston unit mounted in the respective upright and having a piston rod acting upon the associated wheel support for pivot-'- ing the same about said pivot axis.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Conveying And Assembling Of Building Elements In Situ (AREA)
  • Bridges Or Land Bridges (AREA)
  • Jib Cranes (AREA)
  • Leg Units, Guards, And Driving Tracks Of Cranes (AREA)
US00121050A 1970-03-07 1971-03-04 Crane Expired - Lifetime US3759409A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19702010945 DE2010945C (de) 1970-03-07 Fahrbares Portalhebezeug mit hohen und breitenverstellbarem Portal fahrgestell

Publications (1)

Publication Number Publication Date
US3759409A true US3759409A (en) 1973-09-18

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US00121050A Expired - Lifetime US3759409A (en) 1970-03-07 1971-03-04 Crane

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US (1) US3759409A (sv)
FI (1) FI51583C (sv)
GB (1) GB1322626A (sv)

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4158416A (en) * 1975-05-27 1979-06-19 Container Cargo Carriers Corporation System for handling container cargo and a novel ship and lifting device
US4202529A (en) * 1978-02-01 1980-05-13 William L. Fitting Small vehicle lift
US4218174A (en) * 1977-02-18 1980-08-19 Valmet Oy Load-transporting method and apparatus
US4286914A (en) * 1977-12-16 1981-09-01 Davidson Douglas M Jun Means and method for connecting large pipe
US4318632A (en) * 1980-05-22 1982-03-09 Fortmeyer George W Retractable wheel attachment for boat lift
US4378072A (en) * 1980-06-16 1983-03-29 Rpc Corporation Gantry crane
US4546891A (en) * 1983-02-24 1985-10-15 Mi-Jack Products, Inc. Grappler system for lifting apparatus
US4706825A (en) * 1985-05-22 1987-11-17 Harsco Corporation Portable folding bridge crane
US4740131A (en) * 1987-03-09 1988-04-26 Mayle Steven R Apparatus for lifting and carrying heavy loads
WO1988006986A1 (en) * 1987-03-09 1988-09-22 Mayle Steven R Improvements in an apparatus for lifting and carrying heavy loads
US4854804A (en) * 1987-03-09 1989-08-08 Mayle Steven R Lifting and carrying heavy loads
US4861219A (en) * 1987-03-09 1989-08-29 Mayle Steven R Apparatus for lifting and carrying heavy loads
US4927034A (en) * 1988-07-18 1990-05-22 Holden John A Steerable power drive for gantry crane
US4971506A (en) * 1988-05-06 1990-11-20 Shakbar Investments Ltd. Vehicle parking system
USD381178S (en) * 1995-05-26 1997-07-15 Marine Travelift, Inc. Operator cab for a crane
US5803280A (en) * 1993-06-03 1998-09-08 Krupp Fordertechnik Gmbh Lifting and transport apparatus for transcontainers
US5810183A (en) * 1995-05-26 1998-09-22 Marine Travelift, Inc. Gantry crane with elevating operator cab
US6030168A (en) * 1996-03-22 2000-02-29 Mannesmann Aktiengesellschaft Lifting device
US20030180132A1 (en) * 2002-02-14 2003-09-25 Steven Morreim Mobile lift
US6832870B1 (en) * 2002-05-15 2004-12-21 Paul Jules Krivoy Barrier transporter and positioner
US20060133906A1 (en) * 2004-12-17 2006-06-22 Wilt H W B Transport vehicle with loading channel that extends for the entire length of the vehicle
US20090097935A1 (en) * 2007-10-11 2009-04-16 Noell Mobile Systems Gmbh Gantry stacker with two side-by-side spreaders
US20120047821A1 (en) * 2010-05-31 2012-03-01 Feature Walters Assembly system for modular building units
US20130112504A1 (en) * 2011-11-03 2013-05-09 Agm Container Controls, Inc. Low profile wheelchair lift with direct-acting hydraulic cylinders
US8910374B2 (en) * 2012-10-04 2014-12-16 General Electric Company Service apparatus for turbomachine

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2338505B1 (es) * 2007-10-16 2011-04-18 Pacadar S.A. Metodo de carga, transporte y descarga de elementos de gran tonelaje en una campa o zona no equipada para la descarga y portico de desplazamiento autonomo.
CN107055341A (zh) * 2017-05-26 2017-08-18 程保平 一种全地形多功能起重门机

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2831588A (en) * 1954-05-03 1958-04-22 Unibox Corp Inc Freightage means
DE1033233B (de) * 1955-01-15 1958-07-03 Demag Greiferfabrik G M B H Abhebevorrichtung fuer Tiefofendeckel
GB909994A (en) * 1958-10-30 1962-11-07 Materials Handling Equipment G Improvements in or relating to straddle carrier vehicles
US3080196A (en) * 1957-11-12 1963-03-05 James W Darby Vehicle with retractable wheels
US3362553A (en) * 1965-06-23 1968-01-09 Weinmann Karl Carriage for trailers and the like
US3513999A (en) * 1968-03-27 1970-05-26 William H Schwartz Lifting and carrying vehicle
US3536161A (en) * 1968-09-09 1970-10-27 Autoquip Corp Portable servicing lift for vehicle

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2831588A (en) * 1954-05-03 1958-04-22 Unibox Corp Inc Freightage means
DE1033233B (de) * 1955-01-15 1958-07-03 Demag Greiferfabrik G M B H Abhebevorrichtung fuer Tiefofendeckel
US3080196A (en) * 1957-11-12 1963-03-05 James W Darby Vehicle with retractable wheels
GB909994A (en) * 1958-10-30 1962-11-07 Materials Handling Equipment G Improvements in or relating to straddle carrier vehicles
US3362553A (en) * 1965-06-23 1968-01-09 Weinmann Karl Carriage for trailers and the like
US3513999A (en) * 1968-03-27 1970-05-26 William H Schwartz Lifting and carrying vehicle
US3536161A (en) * 1968-09-09 1970-10-27 Autoquip Corp Portable servicing lift for vehicle

Cited By (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4158416A (en) * 1975-05-27 1979-06-19 Container Cargo Carriers Corporation System for handling container cargo and a novel ship and lifting device
US4218174A (en) * 1977-02-18 1980-08-19 Valmet Oy Load-transporting method and apparatus
US4286914A (en) * 1977-12-16 1981-09-01 Davidson Douglas M Jun Means and method for connecting large pipe
US4202529A (en) * 1978-02-01 1980-05-13 William L. Fitting Small vehicle lift
US4318632A (en) * 1980-05-22 1982-03-09 Fortmeyer George W Retractable wheel attachment for boat lift
US4378072A (en) * 1980-06-16 1983-03-29 Rpc Corporation Gantry crane
US4546891A (en) * 1983-02-24 1985-10-15 Mi-Jack Products, Inc. Grappler system for lifting apparatus
US4706825A (en) * 1985-05-22 1987-11-17 Harsco Corporation Portable folding bridge crane
US4740131A (en) * 1987-03-09 1988-04-26 Mayle Steven R Apparatus for lifting and carrying heavy loads
WO1988006986A1 (en) * 1987-03-09 1988-09-22 Mayle Steven R Improvements in an apparatus for lifting and carrying heavy loads
US4854804A (en) * 1987-03-09 1989-08-08 Mayle Steven R Lifting and carrying heavy loads
US4861219A (en) * 1987-03-09 1989-08-29 Mayle Steven R Apparatus for lifting and carrying heavy loads
US4971506A (en) * 1988-05-06 1990-11-20 Shakbar Investments Ltd. Vehicle parking system
US4927034A (en) * 1988-07-18 1990-05-22 Holden John A Steerable power drive for gantry crane
US5803280A (en) * 1993-06-03 1998-09-08 Krupp Fordertechnik Gmbh Lifting and transport apparatus for transcontainers
USD381178S (en) * 1995-05-26 1997-07-15 Marine Travelift, Inc. Operator cab for a crane
US5810183A (en) * 1995-05-26 1998-09-22 Marine Travelift, Inc. Gantry crane with elevating operator cab
US7070060B1 (en) 1995-05-26 2006-07-04 Mi-Jack Products, Inc. Gantry crane with elevating operator cab
US6030168A (en) * 1996-03-22 2000-02-29 Mannesmann Aktiengesellschaft Lifting device
US20030180132A1 (en) * 2002-02-14 2003-09-25 Steven Morreim Mobile lift
US6832870B1 (en) * 2002-05-15 2004-12-21 Paul Jules Krivoy Barrier transporter and positioner
US20060133906A1 (en) * 2004-12-17 2006-06-22 Wilt H W B Transport vehicle with loading channel that extends for the entire length of the vehicle
US20090097935A1 (en) * 2007-10-11 2009-04-16 Noell Mobile Systems Gmbh Gantry stacker with two side-by-side spreaders
US7731041B2 (en) * 2007-10-11 2010-06-08 Noell Mobile Systems Gmbh Gantry stacker with two side-by-side spreaders
US20120047821A1 (en) * 2010-05-31 2012-03-01 Feature Walters Assembly system for modular building units
US8863444B2 (en) * 2010-05-31 2014-10-21 Feature Walters Assembly system for modular building units
US20130112504A1 (en) * 2011-11-03 2013-05-09 Agm Container Controls, Inc. Low profile wheelchair lift with direct-acting hydraulic cylinders
US8783419B2 (en) * 2011-11-03 2014-07-22 Agm Container Controls, Inc. Low profile wheelchair lift with direct-acting hydraulic cylinders
US8910374B2 (en) * 2012-10-04 2014-12-16 General Electric Company Service apparatus for turbomachine

Also Published As

Publication number Publication date
FI51583C (sv) 1977-02-10
FI51583B (sv) 1976-11-01
GB1322626A (en) 1973-07-11
DE2010945A1 (de) 1971-09-16

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