US3552793A - Automatically self-leveling gripping device suspended from the hoisting ropes of a crane - Google Patents

Automatically self-leveling gripping device suspended from the hoisting ropes of a crane Download PDF

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Publication number
US3552793A
US3552793A US728206A US3552793DA US3552793A US 3552793 A US3552793 A US 3552793A US 728206 A US728206 A US 728206A US 3552793D A US3552793D A US 3552793DA US 3552793 A US3552793 A US 3552793A
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US
United States
Prior art keywords
axles
carriage
arms
container
crane
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
US728206A
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English (en)
Inventor
Keijo Lehtonen
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Individual
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Individual
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Filing date
Publication date
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Publication of US3552793A publication Critical patent/US3552793A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C1/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles
    • B66C1/10—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by mechanical means
    • B66C1/101—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by mechanical means for containers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C13/00—Other constructional features or details
    • B66C13/18—Control systems or devices
    • B66C13/50—Applications of limit circuits or of limit-switch arrangements

Definitions

  • a gripping device is suspended from the hoisting ropes of a crane and the device is composed of two parts one above the other, the lower part being suspended from a carriage with two axles, which are in turn suspended by pivoted arms from the upper part.
  • the lower part in its suspension by the carriage is movable by an actuating device in a horizontal direction with reference to the upper part.
  • the wheels of the carriage are journalled on the axles eccentrically with respect to the bearing carrying the pivoted arms and on either axle there is integrally fixed a protruding arm, the ends of which arms cooperate with limit switches for starting or stopping the actuating device.
  • a gripping element which is composed of two parts located one above the other, with the lower part suspended from a carriage with two axles which have been suspended from the upper part by pivoted arms, and whereby the lower part in suspension by the carriage can be moved with the aid of an actuating device in a horizontal direction with reference to the upper part.
  • the actuating device may consist of a hydraulic cylinder or of a mechanical device, screw, tooth rack, etc. operated by an electric motor.
  • An object of the present invention is to provide a device which immediately and automatically on raising the container displaces the upper and lower parts of the gripping element horizontally with respect to each other so that the hoisting point and the center of gravity of the container come to be on the same vertical line.
  • the invention is characterized in that the wheels of the carriage in the gripping element have been journalled on axles eccentrically with reference to the bearings supporting the pivoted arms and that to either axle a protruding arm has been integrally fixed, the ends of these arms cooperating with limit switches which start or stop the said actuating device.
  • FIG. 1 schematically illustrates the gripping element in elevation view, and partly in section, FI151G. 2 is a sectional view along the line II-'II in
  • the gripping element comprises upper part 1 and lower part 2.
  • the upper part 1 is suspended from hoisting ropes, which have been indicated by arrows 3.
  • the lower part 2 is suspended from the upper part 1 by pivoted arms 4.
  • the lower ends of these pivoted arms are journalled on the axles 6 of a carriage 5 each with two wheels 7.
  • a track 8 is provided on the lower part 2 of the gripping element.
  • the ends of the lower part 2 of the gripping element have not been shown in the drawing because they have no significance in the present invention.
  • the wheels 7 of the carriage 5 and the bearings 9 supporting the pivoted arms 4 are carried on the axle 6 eccentrically with reference to each other.
  • the dash-dot line 10 indicates the centerline of the wheel 7 and the dash-dot line 11, the centerline of the support bearing 9.
  • a protruding arm 12 is fixed with a key and which is directed toward the opposite end of the carriage.
  • the end of this arm 12 rests on one arm of a two-armed lever 13- carried in bearings in the lower part 2 of the gripping element.
  • On the opposite arm 14 of the two-armed lever rests an arm 15 similarly fixed to the other axle of the carriage 5.
  • Both arms 13, 14 of the lever are loaded by springs 16, 17.
  • On the body of the carriage 5 above the two-armed lever 1 ⁇ , 14 two limit switches 18, 19 are fixed, their pushers being located immediately above the lever arms 13, 11'
  • the center of gravity is located under the hoisting point, or the center of the hoisting ropes 3.
  • the axles 6 are loaded byforces different in magnitude, whereby also the moments tending to turn them diifer in magnitude. Both axles are then rotated in the direction determined by the greater of the two moments.
  • the arms 12 and 15 fixed to the axles 6 are turned. These arms in their turn cause the two-armed lever 13, 14 to turn. Assuming that the lever is turned in clockwise direction in FIG. 1.
  • the lever arm 13 then depresses the pusher of limit switch 18.
  • This limit switch in its turn opens a pressure mediumgoverning valve (not depicted) so that a double-acting pressure cylinder 20 begins to operate.
  • Embodiments of the invention may naturally vary within the scope of the invention.
  • the wheels 7 of the carriage 5 may be replaced with sliding shoes journalled on the axles 6.
  • an electric motor as an actuating device, in lieu of pressure cylinder 20.
  • I. 'A"'g'ri'ppingdevice adapted for Being-srrspende-crfrom hoisting ropes of a crane ;,to engage a container, said gripping device comprising first and second parts located one above the other, a pair of arms pivotably connected to,the upper parta carriage including two spacedfixles, hearings on said axles suspending said carriage from aid arms, support means on said carriage -forsuspending the lower part from vthe carriage and enabling 'relative displacement therebetween, act'uatormeans for providing relative horizontal displacement between tl 1e*1ower part and the upper part, said support means being supported on said axles eccentrically .with .respect to said bearings such that if the center of gravityof the lower part and any load thereon is not centrally disposed between the afxles, the axles will undergo'rotation, and means coupled to said axles for sensing rotation of said axles to activate the actuator means to centrally locate the cente'fof gravity between the axles
  • a device as claimed in claim- 1 whe'rein said-support means comprises wheels.
  • a device as claimed in-claim 1, wherein said means for sensing rotation of the axles to activate-the" actuator means comprises a protruding arm fixedon each axle, and'switch means operatively positioned with respect to each arm to control the opeation of the 'actilatonmeans.
  • a device as claimed in claim 3 wherein the protruding arms of the axles extend towards each other, said means for sensing-rotation of the axles further comprising a two arm lever pivotably connected to' said lower part, each arm of said lever facing a respective protruding arm and a respective switch means.
  • a device as claimed in claim 4, wherein said means for sensing rotation of the axles comprises spring means acting on each arm of said two arm lever to resist rotat on of the lever under the action of said protruding arms.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Carriers, Traveling Bodies, And Overhead Traveling Cranes (AREA)
  • Load-Engaging Elements For Cranes (AREA)
US728206A 1968-04-02 1968-05-10 Automatically self-leveling gripping device suspended from the hoisting ropes of a crane Expired - Lifetime US3552793A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI0899/68A FI43633B (de) 1968-04-02 1968-04-02

Publications (1)

Publication Number Publication Date
US3552793A true US3552793A (en) 1971-01-05

Family

ID=8504808

Family Applications (1)

Application Number Title Priority Date Filing Date
US728206A Expired - Lifetime US3552793A (en) 1968-04-02 1968-05-10 Automatically self-leveling gripping device suspended from the hoisting ropes of a crane

Country Status (4)

Country Link
US (1) US3552793A (de)
DE (1) DE1756297A1 (de)
FI (1) FI43633B (de)
SE (1) SE334722B (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6048012A (en) * 1997-06-12 2000-04-11 Selby; Cloyd R. Understructure lifting beam
US7017963B1 (en) 2004-05-17 2006-03-28 Selby Arm, Inc. Counter weighted lifting beam
US20160221811A1 (en) * 2012-02-20 2016-08-04 Elme Spreader Ab Side lift spreader
US11654989B2 (en) * 2019-04-11 2023-05-23 Hall Labs Llc Load leveling hanger

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE350230B (de) * 1970-08-27 1972-10-23 Haegglund & Soener Ab

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6048012A (en) * 1997-06-12 2000-04-11 Selby; Cloyd R. Understructure lifting beam
US7017963B1 (en) 2004-05-17 2006-03-28 Selby Arm, Inc. Counter weighted lifting beam
US20160221811A1 (en) * 2012-02-20 2016-08-04 Elme Spreader Ab Side lift spreader
US9751739B2 (en) * 2012-02-20 2017-09-05 Elme Spreader Ab Side lift spreader
US10377616B2 (en) 2012-02-20 2019-08-13 Elme Spreader Ab Side lift spreader
US11654989B2 (en) * 2019-04-11 2023-05-23 Hall Labs Llc Load leveling hanger

Also Published As

Publication number Publication date
FI43633B (de) 1971-02-01
SE334722B (de) 1971-05-03
DE1756297A1 (de) 1970-03-12

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