US3486784A - Magnet lifting yoke - Google Patents

Magnet lifting yoke Download PDF

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Publication number
US3486784A
US3486784A US676252A US3486784DA US3486784A US 3486784 A US3486784 A US 3486784A US 676252 A US676252 A US 676252A US 3486784D A US3486784D A US 3486784DA US 3486784 A US3486784 A US 3486784A
Authority
US
United States
Prior art keywords
shaft
magnets
girder
magnet
slings
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
US676252A
Other languages
English (en)
Inventor
Bent N Ejlertsen
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.)
MAGNEMAG HAGOU AS
Original Assignee
H Nielsen and Son Maskinfabrik AS
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 H Nielsen and Son Maskinfabrik AS filed Critical H Nielsen and Son Maskinfabrik AS
Application granted granted Critical
Publication of US3486784A publication Critical patent/US3486784A/en
Assigned to MAGNEMAG HAGOU A/S, reassignment MAGNEMAG HAGOU A/S, ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: H. NIELSEN & SON MASKINFABRIK A/S
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/20—Electromagnets; Actuators including electromagnets without armatures
    • H01F7/206—Electromagnets for lifting, handling or transporting of magnetic pieces or material
    • 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
    • B66C1/04—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 magnetic means
    • B66C1/06—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 magnetic means electromagnetic

Definitions

  • a yoke for lifting iron bars consisting of a box-shaped girder beneath which a number of long, narrow electromagnets are rotatably suspended by means of a shaft in the girder.
  • Each magnet carries at its ends end pins suspended by means of slings or ropes.
  • These slings are connected with spring means in the girder and with said shaft so that slings can be moved for vertical displacement and for turning the magnet.
  • each sling is passed around its separate pulley in its separate spring means and then down and attached to the shaft.
  • the object of the invention is to provide a magnet lifting yoke whose shaft for turning the magnets may be securely m-ounted in the magnet yoke, and to provide a shaft which may be manufactured as a long undivided length.
  • the yoke may be adapted in such manner that the shaft for turning the magnets rests in fixed bearings provided in the girder, each of the slings or ropes being passed up around its separate pulley in its separate spring means and then down and attached to the shaft.
  • the latter does thereby not take part in the resilient movement, but may be supported in fixed bearings provided in the yoke.
  • the slings or ropes may be wound at least once around the shaft and attached to same.
  • the magnets can be turned through a desired angle by turning the shaft, and if, more particularly, the shaft is made with a diameter somewhat smaller than the diameter of the end pins of the magnets, an advantageous ratio of gearing between shaft and end pins will be obtained.
  • the magnets can therefore be turned exactly into such position that they are caused to rest with their entire supporting surface in abutment against the iiange of the steel joist involved when the said ange forms an angle to a horizontal plane.
  • the shaft may further according to the invention carry twin arms to which the ends of the slings are fastened. Windings of the slings around the twin arms are thereby avoided.
  • the shaft may in a suitable embodiment according to the invention carry rope pulleys to which the ends of the slings are attached.
  • the result obtained in that case is proportionality between the turning angles of the shaft and the magnets.
  • the shaft may be mechanically connected with a driving motor, for example a gear motor which is m-ounted on or in the magnet lifting yoke at its central part.
  • a driving motor for example a gear motor which is m-ounted on or in the magnet lifting yoke at its central part.
  • FIGURE 1 shows fractions of a magnet lifting yoke with supension means and magnets and a rolled steel joist carried by these and viewed from the side
  • FIGURE 2 shows on a larger scale a section taken upon the line II-II of FIGURE 1, and
  • FIGURE 3 in corresponding manner shows a modication of a magnet lifting yoke in which the shaft carries twin arms.
  • FIGURE 1 shows a magnet lifting yoke which is suspended in known manner by suspension means 1 from the crab of a hoisting apparatus.
  • the magnet yoke is designed as a box-shaped girder 2 consisting of a main beam 3 and a foot beam 4.
  • the said beams are interconnected by means of two lattice sections 5.
  • Beneath and along the girder 2 are mounted a number of electromagnets 6 lifting a steel joist 7 as shown in FIGURE l.
  • the magnets 6 carry at each of their ends end pins 8 in which the magnets are rotatably suspended by means of slings or ropes 9.
  • the said slings are connected with spring means 10 (FIGURE 2) mounted in the main beam 3 of the girder 2 so that the springs 11 of the spring means are protected from damage.
  • spring means 10 FIG. 1
  • the slings 9 serve both as suspension elements and as rotational elements for the magnets 6.
  • a driving motor 12 for example a gear motor, which is connected by means of a chain 13 with a shaft 14 for turning the magnets 6.
  • the shaft 14 is carried by xed bearings (not shown) provided in the girder beneath the spring means 10, and it extends ,along the girder in the entire length of same.
  • the sling 9 is passed from the electromagnet 6 through the foot beam 4 up around a pulley 15 which rests in a fork 16 mounted in the spring means 10. From the pulley 15 the sling 9 is passed down and attached to the shaft 14. The sling 9 may be wound at least once around the shaft 14. The said shaft may carry a rope pulley 17 indicated by dots on FIGURE 2, the ends of the sling 9 being attached to the said pulley.
  • FIGURE 3 shows an embodiment in which the shaft 14 carries twin arms 18 to which the ends of the sling 9 are attached.
  • Apparatus for lifting elongated members of magnetizable material such as rolled steel joists comprising in combination; a girder, a plurality of magnets disposed below the girder in end to end relationship, and means suspending said magnets below the girder for rotation relative to the girder about the axes of the magnets, said means including pulleys, resilient means suspending the pulleys from the girder, and slings received about the pulleys and portions on said magnets to rotate said magnets in response to rotation of the pulleys.
  • said means further includes a shaft mounted on said girder in generally parallel relationship therewith and for rotation relative to the girder, and wherein said -slings are connected around said shaft to be moved in response to rotation of said shaft.
  • the apparatus defined in claim 2 further including a motor mounted on said girder and means operatively connecting said motor to said shaft to drive the shaft in rotation.
  • said resilient means includes yoke members with said pulleys rotatably mounted therein; .and means including springs suspending said yoke members from the girder.
  • said girder includes an upper main beam, a lower foot beam and means interconnecting said beams to form a generally rectangular girder, and wherein said pulleys are suspended from said main beam and said magnets are located below said foot beam with said slings passing through said foot beam.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Load-Engaging Elements For Cranes (AREA)
US676252A 1966-11-02 1967-10-18 Magnet lifting yoke Expired - Lifetime US3486784A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DK570466AA DK111837B (da) 1966-11-02 1966-11-02 Magnetåg.

Publications (1)

Publication Number Publication Date
US3486784A true US3486784A (en) 1969-12-30

Family

ID=8144625

Family Applications (1)

Application Number Title Priority Date Filing Date
US676252A Expired - Lifetime US3486784A (en) 1966-11-02 1967-10-18 Magnet lifting yoke

Country Status (5)

Country Link
US (1) US3486784A (da)
DE (2) DE6608824U (da)
DK (1) DK111837B (da)
GB (1) GB1134980A (da)
SE (1) SE312654B (da)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3658372A (en) * 1969-05-23 1972-04-25 Nielsen & Son Maskinfab As H Magnet yoke for lifting iron bars
US3805978A (en) * 1972-01-06 1974-04-23 Nielsen & Son Maskinfab As H Transport apparatus
US3968986A (en) * 1974-08-08 1976-07-13 Kohan Sendan Kikai Kabushikikaisha Electromagnetic lifting device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202012103280U1 (de) * 2012-08-29 2013-12-04 Scheffer Krantechnik Gmbh Lastaufnahmemittel für magnetische Langgüter

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1141061B (de) * 1961-01-23 1962-12-13 Joergen Jensen Hansen Tragbalken mit beweglich angeordneten Magneten zum Heben von Eisenstangen

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1141061B (de) * 1961-01-23 1962-12-13 Joergen Jensen Hansen Tragbalken mit beweglich angeordneten Magneten zum Heben von Eisenstangen

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3658372A (en) * 1969-05-23 1972-04-25 Nielsen & Son Maskinfab As H Magnet yoke for lifting iron bars
US3805978A (en) * 1972-01-06 1974-04-23 Nielsen & Son Maskinfab As H Transport apparatus
US3968986A (en) * 1974-08-08 1976-07-13 Kohan Sendan Kikai Kabushikikaisha Electromagnetic lifting device

Also Published As

Publication number Publication date
SE312654B (da) 1969-07-21
DE1531237A1 (de) 1969-12-11
GB1134980A (en) 1968-11-27
DK111837B (da) 1968-10-14
DE6608824U (de) 1971-12-09

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Legal Events

Date Code Title Description
AS Assignment

Owner name: MAGNEMAG HAGOU A/S,, STATELESS

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:H. NIELSEN & SON MASKINFABRIK A/S;REEL/FRAME:003854/0872

Effective date: 19810305

Owner name: MAGNEMAG HAGOU A/S, METERBUEN 6-12, DK-2740 SKOVLU

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:H. NIELSEN & SON MASKINFABRIK A/S;REEL/FRAME:003854/0872

Effective date: 19810305