US3618066A - Actuator and signal device for a lifting magnet - Google Patents

Actuator and signal device for a lifting magnet Download PDF

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Publication number
US3618066A
US3618066A US826398A US3618066DA US3618066A US 3618066 A US3618066 A US 3618066A US 826398 A US826398 A US 826398A US 3618066D A US3618066D A US 3618066DA US 3618066 A US3618066 A US 3618066A
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United States
Prior art keywords
electromagnet
circuit
actuator
signal device
switch
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Expired - Lifetime
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US826398A
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English (en)
Inventor
Harald Brommont
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Heinrich Koppers GmbH
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Heinrich Koppers GmbH
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    • 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

Definitions

  • ABSTRACT An electromagnet-lifting device employed to remove metallic charging hole covers includes a movable actuator member that has a length greater than the thickness of the magnet. When the bottom surface of the magnet is positioned on top of a charging hole cover the actuator is displaced upwardly relative to the magnet and closes a switch in the circuit to energize the magnet and engage the charging hole cover. A relay in the circuit closes a separate switch in another circuit to actuate a signal device that indicates the charging hole cover is engaged by the lifting device.
  • the charging machine operators compartment is usually positioned at a location where it is difficult for the charging machine operator in the operator's compartment to visually observe whether all of the charging hole covers have been removed so that the feed pipes may be positioned in the charging holes.
  • indicating apparatus is provided in the cover-lifting magnets for indicating when the charging hole cover is engaged by the lifting magnet.
  • the indicating apparatus includes a magnetically actuated switch that actuates a signalling device.
  • the magnetic switches must be accurately adjusted and at times are inoperative with various charging hole covers because of the different magnetic properties present in the various charging hole covers.
  • Other indicating devices have signaling switches which are operated by eccentric pins of small diameter when the coversare engaged and suspended.
  • the eccentric-type pin is inoperable with a lifting device that includes a cover-turning device for rotating the charging hole cover because the pins jam when the turning device is actuated.
  • Both the magnetically actuated switch and the eccentric switch actuator require a separate circuit fromthe operators compartment to a location on the lifting magnet. The separate circuits frequently are damaged by the. high temperatures present adjacent the charging holes.
  • the instant invention is directed to a signaling device that does not require a separate signal circuit adjacent the electromagnet and is not dependent on a magnetic actuator or an eccentric actuator.
  • the signaling device includes an actuator that is movably mounted on the electromagnet and depends below the bottom surface of the magnet. When,the electromagnet is positioned in overlying relation with the charging hole cover, the actuator moves upwardly relative to the electromagnet and closes a switch in the circuit to the electromagnet and thus completes the circuit.
  • a remotely positioned signal device is provided that is responsive to the flow of current in the first circuit to indicate the engagement of the electromagnet to the charging hole cover. The electromagnet is thus not energized until the actuator closes the normally open switch in the electromagnet circuit. With this arrangement a separate circuit to the electromagnet for a signal device is eliminated.
  • the principal object of this invention is to provide a signal device to indicate the engagement of the electromagnet to a charging hole cover that does separate signal circuit to the electromagnet.
  • Another object of this invention is to provide an actuator for a signal device that is associated with the electromagnet and is not dependent on either magnetic forces between the switch and the charging hole cover or an eccentric pin-type actuator.
  • FIG. I there is diagrammatically illustrated a coking chamber 10 having a cylindrical charging hole 12 that extends downwardly into the chamber 10 from the battery roof 14.
  • a metallic charging hole cover 16 is positioned in the charging hole 12 and abuts the annular lip 18 to seal the charging hole 12.
  • the charging hole cover 16 has an upper surface 20 with a circular central opening 22 forming a recess 24.
  • a transverse member 26 is formed in the recess 24 for manually handling the charging hole cover 16.
  • An annular electromagnet generally designated by the numeral 28 has a body portion 30 with an annular coildiagrammatically illustrated at 32 therein.
  • the body portion 30 has an upper surface 34, a lower surface 36 and a central axial passageway 38.
  • the electromagnet 28 is suspended from the larry car by cables 29 and is arranged to be lowered by the cables onto the upper surface 20 of the charging hole cover 16.
  • a cylindrical actuator 40 is movably positioned in the electromagnet axial passageway 38 and has a bottom wall 42 and a top wall 44.
  • the actuator 40 may be fabricated from various materials, preferably nonmagnetizable materials. The actuator 40 should, however, have sufficient mass or weight to assume the positions illustrated in FIGS.
  • the actuator 40 hasan annular recessed portion 46 adjacent the top wall 44 in which a ring member 48 is positioned.
  • the ring member 48 has a peripheral dimension greater than the dimension of the axial passageway 38 and limits the downward movement of the cylindrical actuator 40 as illustrated in FIG. 1 by abutting the electromagnet upper surface 34.
  • the longitudinal dimension of the cylindrical actuator 40 is greater than the dimension of the electromagnet between the top surface 34 and the bottom surface 36 so that the lower portion of the bottom wall 42 extends below the electromagnet bottom surface 36 when the electromagnet 28 is suspended as illustrated in FIG. I.
  • a source of current for a plurality of lifting electromagnets 28 on each larry car is supplied through conductors 50 and 52.
  • a circuit generally designated by the numeral 72 includes branch conductors 54 and 56 that connect the source of current with the coil 32 to supply current thereto.
  • a double pole switch 58 is connected to a switch actuator 60 such as a relay in the operator's compartment.
  • a second switch 62 is provided in conductor 54 adjacent the electromagnet 28.
  • the switch 62 has a housing 64 with an arm 66 extending laterally therefrom.
  • a roller 68 is rotatably secured to the end of arm 66 and is positioned on the upper surface 44 of actuator 40.
  • the switch 62 is normally open and is arranged to be closed by upward pivotalmovement of arm 66.
  • a relay diagrammatically illustrated at 70 is actuated by current flowing through the conductor 56.
  • a second signal circuit generally designated by the numeral 74 is connected to conductors 76 and 78 of a second power source and includes conductors 80 and 82.
  • a switch 84 in conductor 80 is also connected to the actuator 60 in the operator's compartment or at a location remote to the electromagnet 28.
  • the connection between actuator 60 and switch 84 is diagrammatically illustrated as a rod and designated by the numeral 86.
  • a second switch 88 in circuit 74 is controlled by the relay 70 in circuit 72 and a signal device 90 is positioned in series with the switch 72 in circuit 74.
  • the operator energizes the actuator 60 which may be a relay or the like to close the double switch 58 in circuit 72 and the switch 84 in circuit 74.
  • Current from the main power source is supplied to the circuit 72 through the conductors 54 and 56.
  • the switch 62 maintains the circuit 72 open so that current is not supplied to the coil 32 until the switch 62 is closed.
  • the relay 70 in circuit 72 is deenergized until the circuit 72 is complete by the closing of switch 62.
  • the actuator 40 moves vertically upwardly in the axial passageway 38 to thus pivot the arm 66 and close switch 62 to thereby close the circuit 72 and supply current to the coils 32 and exert an electromagnetic force to magnetically engage the charging hole cover 16 to the electromagnet 28.
  • FIG. 2 illustrates the charging hole cover 16 after it has been magnetically engaged by the electromagnet 28 and lifted by the electromagnet 28 from its covering position, as illustrated in FIG. 1.
  • switch 62 in circuit 72 When switch 62 in circuit 72 is closed, the relay 70 is energized to close the switch 88 in the second circuit 74. Closing switch 88 energizes the remotely positioned signal device 90 to indicate that the charging hole cover 16 is magnetically engaged by the electromagnet 28.
  • relay 70 Other means can be associated with relay 70 to provide both an audio signal and an interlock with the charging machine when the relay 70 is subsequently deenergized while switch 58'is closed to indicate that the charging hole cover 16 is no longer engaged by the electromagnet 28 as may occur when the charging hole cover 16 is inadvertently released by the electromagnet 28 while the charging hole cover is in a suspended position.
  • the transverse radial dimension of the actuator 40 is such that positive closing of the switch 62 is assured even though theelectromagnet 28 is not centered in relation to the charging hole cover 16 and an edge portion of the actuator 40 is in overlying relation with the recess 24.
  • the radial dimension of the actuator 40 is greater than the radial dimension of the annular opening 22 in the charging hole cover top surface 20.
  • the actuator 40 drops downwardly to the position indicated in H6. 1 and switch 62 is opened to interrupt the supply of current to the electromagnet coil 32.
  • the opening of circuit 72 deenergizes the relay 70 and switch 88 in circuit 74 is opened and the signal 90 is deenergized.
  • Another signal can be transmitted by other actuators in the relay 70 to indicate that the cover has dropped. Also, contacts within relay 70 can interrupt subsequent charging operations until the charging hole cover 16 is again engaged by the electromagnet 28.
  • a signal device for an electromagnet comprising,
  • an actuator movably secured to said electromagnet and having an end portion extend beyond a surface of said electromagnet a preselected distance
  • said actuator operable to move relative to said electromagnet upon positioning said metallic member adjacent said surface a distance less than said preselected distance to thereby close said first normally open switch in said circuit to complete said circuit and supply current to said coil and energize said electromagnet
  • a remotely positioned signal device responsive to the flow of current in said first circuit to indicate the engagement of said metallic member to said electromagnet.
  • said first normally open switch includes a switch arm having an end portion in overlying relation with said actuator so that movement of said actuator pivots said switch arm to close said first normally open switch.
  • a signal device for an electromagnet as set forth in claim 1 which includes,
  • said relay operable upon flow of current through said first circuit to close said switch in said second circuit and energize said signal device.
  • said electromagnet includes an annular body member housing an annular coil and having an axial aperture therethrough,
  • a signal device for indicating the engagement of a lifting magnet to a metallic coking chamber charging hole cover comprising,
  • an electromagnet arranged to be suspended from a larry car for magnetically removing a metallic charging hole cover
  • a first normally open switch mounted on said electromagnet and arranged to be closed by said actuator
  • said actuator operable to be displaced vertically relative to said electromagnet upon lowering said electromagnet into overlying relation with said charging hole cover to thereby close said first normally open switch in said first circuit and complete said circuit to supply current to said coil and energize said electromagnet
  • a signal device positioned remotely from said electromagnet and responsive to the fiow of current in said first circuit to indicate the engagement of said electromagnet to said charging hole cover.
  • a signal device for indicating the engagement of a lifting magnet to a metallic coking chamber charging hole cover as set forth in claim Sin which,
  • said first normally open switch is mounted on the upper surgize said signal device.
  • a relay positioned in said first circuit, 10 a second circuit for energizing a signal device positioned remotely from said electromagnet, a normally open switch in said second circuit controlled by said relay in said first circuit, said relay operable upon flow of current through said first l5 circuit to close said switch in said second circuit and enersaid actuator including a cylindrical rod member having a longitudinal dimension greater than the dimension between the top surface and bottom surface of said electromagnet so that said actuator bottom portion extends beyond the bottom surface of said electromagnet,
  • said actuator having an enlarged top portion that limits downward movement of said actuator.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coke Industry (AREA)
  • Load-Engaging Elements For Cranes (AREA)
  • Audible And Visible Signals (AREA)
US826398A 1968-05-30 1969-05-21 Actuator and signal device for a lifting magnet Expired - Lifetime US3618066A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19681756503 DE1756503C3 (de) 1968-05-30 1968-05-30 Vorrichtung zur Anzeige von an Lasthebemagneten haengenden Lasten

Publications (1)

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US3618066A true US3618066A (en) 1971-11-02

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ID=5694053

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US826398A Expired - Lifetime US3618066A (en) 1968-05-30 1969-05-21 Actuator and signal device for a lifting magnet

Country Status (6)

Country Link
US (1) US3618066A (enrdf_load_stackoverflow)
JP (1) JPS494186B1 (enrdf_load_stackoverflow)
BE (1) BE732632A (enrdf_load_stackoverflow)
DE (1) DE1756503C3 (enrdf_load_stackoverflow)
FR (1) FR1596179A (enrdf_load_stackoverflow)
GB (1) GB1181649A (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4287512A (en) * 1980-03-31 1981-09-01 Dynametric, Inc. Magnetic locking methods and apparatus
US4530028A (en) * 1982-04-02 1985-07-16 Emag Maschinenfabrik Gmbh Electromagnet with expandible cores for exciting coils
US4647268A (en) * 1976-11-16 1987-03-03 Emag Maschinenfabrik Gmbh Part handling device
US4682801A (en) * 1984-08-31 1987-07-28 Securitron-Magnalock Corp. Electromagnet access control circuit
US6284990B1 (en) * 1997-05-19 2001-09-04 The United States Of America As Represented By The Secretary Of The Navy Bore rider switch
US20060119119A1 (en) * 2002-08-08 2006-06-08 Danilo Molteni Mobile-pole lifter for moving ferromagnetic loads
US20150116062A1 (en) * 2010-05-25 2015-04-30 Ixtur Oy Magnet, attaching device, attaching arrangement and method for attaching to an object

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB50797A (enrdf_load_stackoverflow) * 1971-11-02
FR2317049A1 (fr) * 1975-07-11 1977-02-04 Sosolic Freres Organe de prehension magnetique
JPS57115119U (enrdf_load_stackoverflow) * 1981-01-09 1982-07-16
DE3822928A1 (de) * 1987-07-17 1989-01-26 Tiefenbach Gmbh Lastmagnet
NO300439B1 (no) * 1994-11-30 1997-05-26 Maritime Hydraulics As Fremgangsmåte og anordning for å detektere full magnetisering av elektro-permanent-magneter

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3047688A (en) * 1959-11-12 1962-07-31 Jacob Salzman Universally adjustable control device
US3140475A (en) * 1960-12-30 1964-07-07 Gen Electric Electromagnetic position translating device

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1219320A (fr) * 1958-12-23 1960-05-17 Cfcmug Dispositif de signalisation pour électro-aimant
NL256081A (enrdf_load_stackoverflow) * 1959-09-22 1900-01-01
DE1218312B (de) * 1964-08-04 1966-06-02 Steinert Elektromagnetbau Signaleinrichtung zum Anzeigen von Eisenteilen, die von einem Elektromagneten gefasst werden

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3047688A (en) * 1959-11-12 1962-07-31 Jacob Salzman Universally adjustable control device
US3140475A (en) * 1960-12-30 1964-07-07 Gen Electric Electromagnetic position translating device

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4647268A (en) * 1976-11-16 1987-03-03 Emag Maschinenfabrik Gmbh Part handling device
US4287512A (en) * 1980-03-31 1981-09-01 Dynametric, Inc. Magnetic locking methods and apparatus
US4530028A (en) * 1982-04-02 1985-07-16 Emag Maschinenfabrik Gmbh Electromagnet with expandible cores for exciting coils
US4682801A (en) * 1984-08-31 1987-07-28 Securitron-Magnalock Corp. Electromagnet access control circuit
US6284990B1 (en) * 1997-05-19 2001-09-04 The United States Of America As Represented By The Secretary Of The Navy Bore rider switch
US20060119119A1 (en) * 2002-08-08 2006-06-08 Danilo Molteni Mobile-pole lifter for moving ferromagnetic loads
US20150116062A1 (en) * 2010-05-25 2015-04-30 Ixtur Oy Magnet, attaching device, attaching arrangement and method for attaching to an object

Also Published As

Publication number Publication date
BE732632A (enrdf_load_stackoverflow) 1969-10-16
GB1181649A (en) 1970-02-18
FR1596179A (enrdf_load_stackoverflow) 1970-06-15
DE1756503B2 (de) 1972-12-28
DE1756503A1 (de) 1971-01-28
JPS494186B1 (enrdf_load_stackoverflow) 1974-01-30
DE1756503C3 (de) 1973-07-19

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