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Publication numberUS3247974 A
Publication typeGrant
Publication dateApr 26, 1966
Filing dateMay 11, 1964
Priority dateMay 11, 1964
Publication numberUS 3247974 A, US 3247974A, US-A-3247974, US3247974 A, US3247974A
InventorsDechantsreiter Max
Original AssigneeHarnischfeger Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Grab stabilizer for cranes
US 3247974 A
Abstract  available in
Images(2)
Previous page
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Claims  available in
Description  (OCR text may contain errors)

April 1966 M. DECHANTSREITER 3,247,974

GRAB STABILIZER FOR CRANES Filed May 11, 1964 2 Sheets-Sheet l &

A r-roeivEy April 1966 M. DECHANTSREITER 3,247,974

GRAB STABILIZER FOR CRANES 2 Sheets-Sheet 2 Filed May 11, 1964 W) INVENTOR Mfix DECHHNTfiPE/TEK Em A 7'7'0ENEY United States Patent 3,247,974 GRAB STAIHLIZER FOR CRANE Max Dec-hantsreiter, Milwaukee, Wis, assignor to Harnischfeger QOrpOration, Milwaukee, Wis., a corporation of Wisconsin Filed May 11, 1964. Ser. No. 366,241 3 Claims. (Cl. 212--11) The present invention relates generally to mobile gantry cranes of the anti-sway type. More particularly, the invention relates to an anti-sway, telescopic mast for such a gantry crane, which mast is rotatable about a vertical axis and has load levelling mechanism.

Anti-sway mechanisms have heretofore been used with some degree of success, but they have had certain shortcomings and disadvantages. For example, they required a complex system of cross weaved cables, such as shown in US. Patent No. 3,081,884, or required extra motors and braking means. These prior art devices were not sufficiently positive and accurate in preventing all sway, and furthermore did not permit flexibility of movement of the load, particularly in a rotational direction about a vertical axis, or in leveling of the load.

Accordingly, the present invention provides a mobile gantry crane which has a vertically telescoping mast that positively prevents sway in all directions and which insures accurate and positive control of the load at all times. This mast is mounted for rotation about its own vertical axis to permit the load to be rotated 180 degrees to facilitate picking up, moving, and stacking of the load. Another more limited aspect relates to a gantry crane having a mast of the above type and which has mechanism for leveling the load in at least one direction.

Generally, the invention provides an improved mobile gantry crane having a vertical, rigid and telescoping mast which mast is also rotatable about a vertical axis; a more specific aspect relates to a crane of this type in which the mast is carried by a turret on a transversely movable trolley, and which trolley also carries the load leveling means.

These and other objects and advantages of the present invention will appear later as this disclosure progresses, reference being had to the accompanying drawings, in which:

FIGURE 1 is a front elevational view of a mobile gantry crane which embodies the present invention;

FIGURE 2 is a plan view of the crane shown in FIG- URE 1.

Referring in greater detail to the drawings, the crane has four vertical shear legs 1, 2, 3 and 4. These legs depend downwardly from the large, rigid and rectangle frame F that is comprised of two transverse main girders 5, 6 and two longitudinal cross beams 7 and 8. The legs,

girders and cross beams are all rigidly welded or otherwise secured together to form a single, rigid mobile frame having ground engaging wheel means 10 and 11 at the lower ends of the legs. These ground engaging wheels may be of different types or a combination of types. For example, all legs may be equipped with rubber tired wheel means 10 or with flanged wheel means 11 which travel on tracks 12. In the embodiment shown for illustrative purposes, a combination of different wheel means is used, two of the legs 3 and 4 having the flanged wheel means type while legs 1 and 2 are equipped with the rubber tired wheel means.

The drive for the gantry crane is conventional and comprises two separate drive trains, one for .each drive wheel. For example, two squirrel cage electric motors M (only one shown) drive through a speed reducer 13 and a chain drive 14 to the rubber wheels 10.

The crane also has a transversely movable trolley T which moves along tracks 16 and 17 that extend adjacent along and are secured to the girders S and 6, respectively. More particularly, the trolley has four flanged wheels 19 which ride on and are guided by the tracks 16 and 17.

The drive for the trolley takes the form of a hoist 20 at one side of the crane and having squirrel cage electric motors 21 with conventional electrical-mechanical brakes (not shown). This hoist, through gear means 22, drives a shaft 23 having rope drums 24 and 25 fixed at the ends thereof. Wire ropes 26 and 27 are wound on drums 24 and 25 respectively, are trained over idler pulleys 28 at the opposite side of the crane. The wire ropes 26 and 27 are fixed at their opposite ends to the trolley at 29, 30 and 31, 32, respectively.

The drums are thus rotated in either direction to cause the trolley to move in either transverse direction across the crane in the conventional manner.

A rotatable turret is mounted on the upper side of the trolley by six wheels 36 which ride on and are guided by a circular track 37 secured to the upper side of the trolley. Four side thrust rollers 37a (FIGURE 2) are mounted on vertical axes on the turret and bear against the inner vertical side 37b of the channel iron roller circle 370 which forms part of the trolley. This construction insures that the turret remains concentric on the trolley circle and sidewise shifting of the turret cannot occur. The turret is fabricated from two straight members 33, 39, and a large arcuate member 40, all of which are welded together. The wheels or rollers 36 are rotatably mounted on the arcuate member. Suitable cross-braces 42, 43, 44, and are also welded across the members to form a rigid, single turret.

The turret is rotated by the electric, motor drive, rope drum 47 which is carried by the trolley. A wire rope 48 extends around the drum 47, around suitable idler pulleys 4), and its free ends are secured to opposite sides of the turret. The drum can be rotated in either direction to rotate the turret selectively in either direction to any degree. Suitable and conventional limit switches prevent overtravel and rotational speed may be in the order of 1 rpm.

A vertical mast 50 is rigidly secured to and extends downwardly from the turret 35. This mast is of rectangular cross-sectional shape and is of telescoping construction. The mast includes a relatively short upper section 51 which is rigidly secured as by welding to the turret, and more specifically to braces 42, 43, 44, and 45 thereof. An intermediate section 52 is vertically slidable within section 51, and a third or lower section 53 in turn is vertically slidable within the intermediate section. Thus, a considerable range of vertical extension and contraction of the mast is possible. Due to the relatively large cross section of the mast and its rectangular form, no swaying or twisting of the mast or its load can occur.

A grapple means is provided at the lower end of the mast and this includes a grapple frame which is pivotally mounted by two separate axes 6i and 62 which are arranged at right angles to one another. Telescoping grapple arms 64 extend downwardly from the grapple frame 60 and their lower shoes 65 engage the bottom of the load L. The length of the arms can be adjusted by the pins 66 which extend through alignable holes in the parts 64a and 64b of the arms.

Means are provided for actuating the graple arms but as it, per se, forms no part of the present invention, it is believed suflicient to say that a hydraulic power pack is powered by an electric motor and supplies pressure fluid to grapple arm clamp and raise cylinders.

The load is thus capable of swinging within limits from side to side about pivot shaft 62, and in a longitudinal di- G rection about shaft 61. This facilitates the gentle lowering of the load on an uneven surface.

Means are also provided for leveling the load in a transverse direction, that is, about the pivot shaft 62. This means takes the form of a pair of elevating mechanisms 68 and 69, one mounted at either side of the top of the turret. These mechanisms are similar to one another and each include an electric motor 70 which drives a winch drum 72, suitable pulleys 74 mounted on the grapple frame and pulleys 75 on the turret. Wire ropes 73 and 73a are trained over the drums and pulleys. The mechanisrns 68 and 69 can be operated independently of one another to thereby effect load leveling.

RECAPITULATION The present invention provides a mobile gantry crane having a vertical, rigid and telescoping mast that positively prevents sway and permits accurate handling of the load. The mast can be rotated above a vertical axis which greatly facilitates picking up, moving and stacking the load, at either side of the crane, and provision is also made on the mast and turret for leveling the load.

Various modes of carrying out the invention are contemplated as being within the scope of the following claims particularly pointing out and distinctly claiming the subject matter which is regarded as the invention:

1. A mobile crane comprising, an elevated frame, a trolley movable along said frame, a turret rotatably mounted about a vertical axis on said trolley, a vertical mast rigidly fixed at its upper end to said turret and extending downwardly therefrom, said mast being of rectangular cross section and having a plurality of telescoping sections, grapple means at the lower end of said mast for engaging a load to be elevated by contraction of said mast, two pivot axes arranged at right angles to one another at the lower end of the mast for connecting the grapple means thereto, and a pair of load elevating mechanisms carried by said turret and connected to said grapple means, said mechanisms being located one on each side of said turret and operable independently of one another whereby a load carried by said grapple means can be levelled about one of said pivot axes.

2. A crane as defined in claim 1 including four downwardly extending legs for supporting said elevated frame above the ground and wheel means at the lower ends of said legs.

3. A crane as defined in claim 2 further characterized in that there are at least three telescoping sections, the uppermost section being shorter than the others and less than one-quarter the length of the said legs to thereby give a considerable range of vertical extension.

References Cited by the Examiner UNITED STATES PATENTS 979,173 12/1910 Kruger 212-67 2,306,055 12/ 1942 Harry 212127 2,553,378 5/1951 Miller 21221 2,869,734 1/1959 Erenestus 21221 3,051,321 8/1962 Ramsden 212-14 3,175,085 3/1965 Avery 212 X FOREIGN PATENTS 1,277,706 10/ 1961 France. 1,068,628 11/ 1959 Germany. 1,074,241 1/ 1960 Germany. 125,312 6/ 1949 Sweden.

SAMUEL F. COLEMAN, Primary Examiner.

A. IL. LEVINE, Assistant Examiner.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US979173 *Aug 2, 1910Dec 20, 1910Albert M KrugerDerrick bull-wheel.
US2306055 *Oct 24, 1940Dec 22, 1942Robert J HarrySoaking pit crane
US2553378 *Jul 9, 1947May 15, 1951Du PontMaterial handling device
US2869734 *Sep 12, 1955Jan 20, 1959Smith Corp A OHoist unit
US3051321 *Nov 23, 1959Aug 28, 1962Pacific Coast Eng CoGantry type crane assembly
US3175085 *Jul 13, 1961Mar 23, 1965Varian AssociatesX-ray hoisting apparatus with automatic securing means
DE1068628B * Title not available
DE1074241B * Title not available
FR1277706A * Title not available
SE125312A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3433366 *Oct 22, 1965Mar 18, 1969Southern Iron & Equipment Co IGantry cranes
US3474800 *Nov 21, 1966Oct 28, 1969Electrical & Mechanical ServicTransfer apparatus
US3501022 *Jul 28, 1967Mar 17, 1970Adriano & F Lli Rossi SpaOverhead transporter for oriented goods
US3568859 *Dec 5, 1968Mar 9, 1971Avery Products CorpAligning means for package labeling
US3655232 *Jun 13, 1969Apr 11, 1972Ghislain Antoine Jean Marie MaGripper for handling heavy products and specifically horizontal-axis coils
US3771666 *Jun 30, 1972Nov 13, 1973Harnischfeger CorpLoad grab mechanism having separable rotatable grab arms
US3805967 *Sep 5, 1972Apr 23, 1974Renner Mfg CoDual hook hoist apparatus
US3874513 *Aug 20, 1973Apr 1, 1975Wilson RayCrane structure
US3874514 *Jan 15, 1973Apr 1, 1975Wilson RayCrane arrangement and ladle structure
US3887080 *Jun 29, 1973Jun 3, 1975Wilson RayCrane structure
US3888808 *Nov 30, 1973Jun 10, 1975Mobil Oil CorpTall oil epoxy ester exterior coating for lap-seam beverage cans
US3949895 *Feb 24, 1975Apr 13, 1976Mobil Oil CorporationEpoxy exterior coating for lap-seam beverage cans
US3987905 *Jan 27, 1975Oct 26, 1976Harnischfeger CorporationOverhead crane including grapple means
US4121955 *Sep 7, 1976Oct 24, 1978Foseco Trading A.G.Treatment of electrodes
US4496063 *Oct 22, 1982Jan 29, 1985Kawasaki Steel CorporationMethod of handling slabs by an overhead traveling crane provided with a slab grip lifter
US5915906 *Dec 19, 1997Jun 29, 1999Krupp Fordertechnik GmbhApparatus for loading and unloading a ship
US6158602 *Nov 5, 1999Dec 12, 2000Mi-Jack Products, Inc.Railwheel system for supporting loads on a road-traveling gantry crane
US6230911 *Oct 5, 2000May 15, 2001Mi-Jack Products, Inc.Rail wheel system for supporting loads on a road-traveling gantry crane
US7267239 *Aug 12, 2003Sep 11, 2007Toru TakeharaMethod for nonintrusive scanning of cargo containers in a buffer operation
US7370768 *Jun 28, 2007May 13, 2008Nigel ChatteyCrane apparatus for direct transshipment of marine containers between transportation modes without need of ground placement
US7677857 *Mar 16, 2010Paceco Corp.Mobile cargo container scanning buffer crane
US7731041 *May 12, 2008Jun 8, 2010Noell Mobile Systems GmbhGantry stacker with two side-by-side spreaders
US8087867Jan 3, 2012Shanhai Zhenhua Port Machinery Co. Ltd.Loading/unloading system for container terminal
US8646630Nov 30, 2009Feb 11, 2014Gottwald Port Technology GmbhBridge crane or gantry crane comprising a cable length-adjusting element fastened to the load accepting means
US8800791 *Nov 30, 2009Aug 12, 2014Gottwald Port Technology GmbhBridge crane or gantry crane comprising a revolving arrangement and lifting frames suspended thereunder
US8967403 *Nov 28, 2012Mar 3, 2015Samsung Electronics Co., Ltd.Hoist apparatus and hoist transporting system
US9090436 *Nov 3, 2010Jul 28, 2015Terex MPHS GmbHHandling system for ISO containers having a gantry crane
US9096294 *Jun 20, 2011Aug 4, 2015The United States Of America As Represented By The Secretary Of The NavyTrolley-payload inter-ship transfer system
US20020092820 *Nov 14, 2001Jul 18, 2002Nigel ChatteyCrane apparatus for direct transshipment of marine containers between transportation modes without need of ground placement
US20050036853 *Aug 12, 2003Feb 17, 2005Paceco Corp.Method for nonintrusive scanning of cargo containers
US20050036854 *Aug 12, 2003Feb 17, 2005Paceco Corp.Mobile cargo container scanning crane
US20070246437 *Jun 28, 2007Oct 25, 2007Nigel ChatteyCrane apparatus for direct transshipment of marine containers between transportation modes without need of ground placement
US20090000111 *Jun 21, 2005Jan 1, 2009Reinhard SchneiderTranslatory Manipulator, Processing Line and Method of Processing Work Pieces
US20090097935 *May 12, 2008Apr 16, 2009Noell Mobile Systems GmbhGantry stacker with two side-by-side spreaders
US20090191028 *Jul 30, 2009Hong TianLoading/unloading system for container terminal
US20100314346 *Dec 16, 2010Hong TianRear yard crane for automatic terminal
US20110240584 *Nov 30, 2009Oct 6, 2011Gottwald Port Technology GmbhBridge crane or gantry crane comprising a revolving arrangement and lifting frames suspended thereunder
US20120243966 *Nov 3, 2010Sep 27, 2012Gottwald Port Technology GmbhHandling system for iso containers having a gantry crane
US20130134120 *May 30, 2013Samsung Electronics Co., Ltd.Hoist apparatus and hoist transporting system
CN101837932A *May 28, 2010Sep 22, 2010江苏能建机电实业集团有限公司Retracting device of protective rope for boiler maintenance platform
DE3710436A1 *Mar 28, 1987Oct 13, 1988Gutehoffnungshuette ManTrolley of a crane for either grab or packaged-goods operation
DE4120923A1 *Jun 25, 1991Jan 7, 1993Krupp IndustrietechStueckgutumschlageinrichtung
DE19700469A1 *Jan 9, 1997Jul 16, 1998Krupp Foerdertechnik GmbhEinrichtung für das Ent- und Beladen von Schiffen
DE20013245U1 *Aug 1, 2000Dec 13, 2001Optus Container Handling GmbhEinrichtung zum Umschlag von Containern
EP2757065A1 *Apr 1, 2011Jul 23, 2014Par Systems, Inc.Tensile truss mast
WO1999041094A1 *Feb 17, 1999Aug 19, 1999Mi-Jack ProductsRailwheel system for supporting loads on a road-traveling gantry crane
WO2010066603A1 *Nov 30, 2009Jun 17, 2010Gottwald Port Technology GmbhBridge crane or gantry crane comprising a cable length-adjusting element fastened to the load accepting means
WO2010066604A1 *Nov 30, 2009Jun 17, 2010Gottwald Port Technology GmbhBridge crane or gantry crane comprising a revolving arrangement and lifting frames suspended thereunder
WO2011123816A2 *Apr 1, 2011Oct 6, 2011Par Systems, Inc.Tensile truss mast
WO2011123816A3 *Apr 1, 2011Oct 26, 2012Par Systems, Inc.Tensile truss mast
Classifications
U.S. Classification414/591, 212/326, 212/318
International ClassificationB66C19/02, B66C13/00, B66C13/06
Cooperative ClassificationB66C19/02, B66C19/007, B66C13/00, B66C13/06, B66C2700/017
European ClassificationB66C13/00, B66C13/06, B66C19/02, B66C19/00F