US1767458A - Lifting magnet - Google Patents

Lifting magnet Download PDF

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Publication number
US1767458A
US1767458A US420377A US42037730A US1767458A US 1767458 A US1767458 A US 1767458A US 420377 A US420377 A US 420377A US 42037730 A US42037730 A US 42037730A US 1767458 A US1767458 A US 1767458A
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Prior art keywords
pole
pieces
plate
annular
high magnetic
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Expired - Lifetime
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US420377A
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Francis W Jessop
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Ohio Electric & Controller Co
Ohio Electric & Controller Com
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Ohio Electric & Controller Com
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Priority to US420377A priority Critical patent/US1767458A/en
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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

  • This invention relates to an electric lifting magnet of the type used for handling scrap iron and the like.
  • Fig. 1 is a bottom plan view of a magnet embodying my improvement
  • Fig, 2 is a fragmentary sectional view corresponding substan,- tially to a section on line 2-1-2 of Fig. 1.
  • the magnet comprises the central pole piece 10, the outer annular pole piece 12, and an upper plate 14 to which such pole pieces are attached.
  • the pole pieces 10 and 12 and the upper plate 14 are composed of material of high magnetic susceptibility, preferably cast steel or the like.
  • the central pole piece is provided with a shoulder 11 extending outwardly and the annular outer pole piece is provided with a corresponding shoulder 13 extending inwardly.
  • These two pole pieces are attached to the plate 14 by means of suitable studs 16 and 18 extending therethrou h.
  • the plate 14 is also provided with a ss 17 adapted to anchor the samefirmly to the central pole piece.
  • An upstanding rib l9 havi a hole 20 drilled therein is provided for the attachment of a suitable chain which cooperating with two or more similar ribs serves as means for attaching the m at to a lifting device.
  • a plate 21 composed of material of high magnetic reluctance, preferably manganese steel, since that material also gives a great resistance to abrasion.
  • a suitable coil designated by C Positioned in the space between the plates 14 and 2 1 is a suitable coil designated by C and adapted to magnetize the pole pieces, causing a magnetic circuit from one of the pole pieces through the plate l t to the other pole piece and across the gap between the shoulders 11 and 13.
  • the plate 21 Since the plate 21 has high magnetic reluctance there will be a great tendency to hold pieces of ferrous metal between the pole pieces and against the plate 21. It has been found in practice that a considerable abrasion of the pole pieces results from the magnetic action upon the material handled causing same to be pulled into more or less violent contact with the pole pieces and the plate 21.
  • the plate 21 being of much tougher metal than the pole pieces suffers the least damage and when provided with the annular ribs 22 and 23 serves to prevent the abrasion on the pole pieces from cutting away the shoulders 11 and 13 entirely. It has been found that when these ribs are notprovided the shoulders will be cut away along lines corresponding somewhat to the line A although the Wear on the two shoulders is somewhat unequal.
  • a lifting magnet including spaced pole-pieces composed of material of high magnetic susceptibility, means for attaching said pole-pieces together, a shoulder carried by each of said pole pieces, a plate composed of material of high magnetic reluctance carried by said shoulders and means tending to cause a magnetic flux between said spaced pole-pieces, said plate having a projection near one of said pole-pieces.
  • a lifting magnet including spaced pole-pieces composed of material of high magnetic susceptibility, means for attaching said pole-pieces together, a shoulder carried by each of said pole-pieces, a plate composed of material of high magnetic reluctance carried by said shoulders and means tending to cause a magnetic flux between said spaced pole-pieces, said plate having a projection near one of said polepieces, said plate being composed of a material more resistant to abrasion than said pole-pieces.
  • a lifting magnet including spaced pole-pieces composed of material of high magnetic susceptibility, means for attaching said pole-pieces together, a shoulder carried by each of said pole-pieces, a plate composed of material of high magnetic reluctance carried by said shoulders and means tending to cause a magnetic flux between said spaced pole-pieces, said plate having a projection near one of said pole-pieces, said plate being composed of manganese steel.
  • a lifting magnet including spaced pole-pieces composed of material of high magnetic susceptibility, means for attaching said pole-pieces together, a shoulder carried by each of said pole-pieces, a plate composed of material of high magnetic reluctance carried by said shoulders and means tending to cause a magnetic flux between said spaced pole-pieces, said plate having a projection near each of said pole-pieces.
  • a lifting magnet including spaced pole-pieces composed of material of high magnetic susceptibility, means for attaching said pole-pieces together, a shoulder carried by each of said pole-pieces, a plate composed of material of high magnetic reluctance carried by said shoulders and means tending to cause a magnetic flux between said spaced pole-pieces, said plate having a projection near each of said pole-pieces, said plate being composed of a material more resistant to abrasion than said pole-pieces.
  • a lifting magnet including spaced pole-pieces composed of material of high magnetic susceptibility, means for attaching said pole-pieces together, a shoulder carried by each of said pole-pieces, a plate composed oi material of high magnetic reluctance carried by said shoulders and means tending to cause a magnetic flux between said spaced pole-pieces, said plate having a projection near each of said pole-pieces, said plate being composed of manganese steel.
  • a lifting magnet including a circular central pole-piece and a spaced annular pole piece concentric therewith, said pieces being composed of a ferrous metal of high magnetic susceptibility, an upper plate composed of material having the same characteristics and connecting said pole-pieces, an outer shoulder on said central piece and an inner shoulder on said annular piece, an annular plate composed of material of high magnetic reluctance and resting on said shoulders, said plate having an annular rib near one of said pole- )ieces.
  • a li ting magnet including a circular central pole-piece and a spaced annular pole piece concentric therewith, said pieces being composed of a ferrous metal of high magnetic susceptibility, an upper plate composed of material having the same characteristics and connecting said pole-pieces, an outer shoulder on said central piece and an inner shoulder on said annular piece, an annular plate composed of material of high magnetic reluctance and resting on said shoulders, said plate having an annular rib near each of said pole-pieces.
  • a lifting magnet including a circular central pole-piece and a spaced annular polepiece concentric therewith, said pieces being composed of a ferrous metal of high magnetic susceptibility, an upper plate composed of material having the same characteristics and connecting said pole-pieces, an outer shoulder on said central piece and an inner shoulder on said annular piece, an annular plate composed of material of high magnetic reluctance and resting on said shoulders, said plate having an annular rib near one of said pole-pieces, said plate being composed of manganese steel.
  • a lifting magnet including a circular central pole-piece and a spaced annular polepiece concentric therewith, said ieces being composed of a ferrous metal of ighmagnetic susceptibility, an upper plate composed of material having the same characteristics and connecting said pole-pieces, an outer shoulder on said central piece and an inner shoulder on said annular piece, an annular plate composed of material of high magnetic reluctance and resting on said shoulders, said plate having an annular rib near each of said pole-pieces, said plate being composed of manganese steel.
  • annular plate of material of high magnetic reluctance having a pro jefcting portion spaced from an edge there- 0 12.
  • annular plate of material of high magnetic reluctance having a projecting portion spaced from each edge thereof.
  • annular plate of material of high magnetic reluctance havin jectin annular rib portion spaced edge t ereof.
  • annular plate of material of high magnetic reluctance having a proj ecting annular rib portion spaced from each edge thereof.
  • annular plate of manganese steel havin a pro ecting portlon spaced from an e ge thereof.
  • annular plate of manganese steel having a projecting portion spaced from each edge thereof.
  • annular plate of manganese steel havin a projecting annular rib portion spaced ilOl'Il an ed e thereof.
  • annular plate of manganese steel having a projecting annular rib portion spaced from each edge thereof.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Load-Engaging Elements For Cranes (AREA)

Description

June 24, 1930. F. w; JESSOP 1,767,458
LIFT ING MAGNET Filed Jan. 13, 1950 Fig. 2. H ,3
BY M M MM ATTORNEYS.
INVENTOR.
Patented June 24, 1930 UNITED STATES PATENT OFFICE FRANCIS w. mssor, 0.1 CLEVELAND unrsnrs, omo, nssrsnoa r run 0310 nrncrnrc RQIQLEQB MPA Y F EVE N 9 1 OR AT O OF H O LIFHHG MAGNET Application filed January 13, 1930. Serial 110.420.377.
This invention relates to an electric lifting magnet of the type used for handling scrap iron and the like.
In the use of magnets of this type it has been found that there is a tendency for the shoulders corresponding to shoulders 11 and 13, seen in Fig. 2 of the drawings, to wear away completely as indicated by the dotted line A which causes loosening or warping of the non-magnetic plate corresponding to 21 in the drawings with the consequence of damage to the electric coil and to the plate and a much reduced life of the magnet as compared with one in which provision is made to avoid the difliculty. The principal object of this invention is to provide by a simple mechanism for the overcoming of this difiiculty.
Referring to the drawings, Fig. 1 is a bottom plan view of a magnet embodying my improvement; and Fig, 2 is a fragmentary sectional view corresponding substan,- tially to a section on line 2-1-2 of Fig. 1.
The magnet comprises the central pole piece 10, the outer annular pole piece 12, and an upper plate 14 to which such pole pieces are attached. The pole pieces 10 and 12 and the upper plate 14: are composed of material of high magnetic susceptibility, preferably cast steel or the like. The central pole piece is provided with a shoulder 11 extending outwardly and the annular outer pole piece is provided with a corresponding shoulder 13 extending inwardly. These two pole pieces are attached to the plate 14 by means of suitable studs 16 and 18 extending therethrou h. The plate 14 is also provided with a ss 17 adapted to anchor the samefirmly to the central pole piece. An upstanding rib l9 havi a hole 20 drilled therein is provided for the attachment of a suitable chain which cooperating with two or more similar ribs serves as means for attaching the m at to a lifting device. Supported on the s oulders 11 and 13 is a plate 21 composed of material of high magnetic reluctance, preferably manganese steel, since that material also gives a great resistance to abrasion. Positioned in the space between the plates 14 and 2 1 is a suitable coil designated by C and adapted to magnetize the pole pieces, causing a magnetic circuit from one of the pole pieces through the plate l t to the other pole piece and across the gap between the shoulders 11 and 13. Since the plate 21 has high magnetic reluctance there will be a great tendency to hold pieces of ferrous metal between the pole pieces and against the plate 21. It has been found in practice that a considerable abrasion of the pole pieces results from the magnetic action upon the material handled causing same to be pulled into more or less violent contact with the pole pieces and the plate 21. The plate 21 being of much tougher metal than the pole pieces suffers the least damage and when provided with the annular ribs 22 and 23 serves to prevent the abrasion on the pole pieces from cutting away the shoulders 11 and 13 entirely. It has been found that when these ribs are notprovided the shoulders will be cut away along lines corresponding somewhat to the line A although the Wear on the two shoulders is somewhat unequal. When a large portion of one of the shoulders wears away ahead of the other the result is in many cases a warping of the plate 21 which causes one edge thereof to be loosened which not only damages the r plate but may cause very serious damage to the coil 0 by reason of water and other foreign material entering. The most important feature of the present invention is the provision of the ribs 22 and 23 which,
being much tougher than the pole pieces, tend to prevent the shoulders from wearing away, causing wear corresponding somewhat to the dotted line B and giving a much greater life to the magnet than would be obtained without said ribs.
While I have not shown the leads to the coil C nor the electrical connections, it is obvious that these may be of usual construction well known to those skilled in the art.
Having thus described my invention, what I claim is 1. A lifting magnet including spaced pole-pieces composed of material of high magnetic susceptibility, means for attaching said pole-pieces together, a shoulder carried by each of said pole pieces, a plate composed of material of high magnetic reluctance carried by said shoulders and means tending to cause a magnetic flux between said spaced pole-pieces, said plate having a projection near one of said pole-pieces.
2. A lifting magnet including spaced pole-pieces composed of material of high magnetic susceptibility, means for attaching said pole-pieces together, a shoulder carried by each of said pole-pieces, a plate composed of material of high magnetic reluctance carried by said shoulders and means tending to cause a magnetic flux between said spaced pole-pieces, said plate having a projection near one of said polepieces, said plate being composed of a material more resistant to abrasion than said pole-pieces.
3. A lifting magnet including spaced pole-pieces composed of material of high magnetic susceptibility, means for attaching said pole-pieces together, a shoulder carried by each of said pole-pieces, a plate composed of material of high magnetic reluctance carried by said shoulders and means tending to cause a magnetic flux between said spaced pole-pieces, said plate having a projection near one of said pole-pieces, said plate being composed of manganese steel.
4. A lifting magnet including spaced pole-pieces composed of material of high magnetic susceptibility, means for attaching said pole-pieces together, a shoulder carried by each of said pole-pieces, a plate composed of material of high magnetic reluctance carried by said shoulders and means tending to cause a magnetic flux between said spaced pole-pieces, said plate having a projection near each of said pole-pieces.
5. A lifting magnet including spaced pole-pieces composed of material of high magnetic susceptibility, means for attaching said pole-pieces together, a shoulder carried by each of said pole-pieces, a plate composed of material of high magnetic reluctance carried by said shoulders and means tending to cause a magnetic flux between said spaced pole-pieces, said plate having a projection near each of said pole-pieces, said plate being composed of a material more resistant to abrasion than said pole-pieces.
6. A lifting magnet including spaced pole-pieces composed of material of high magnetic susceptibility, means for attaching said pole-pieces together, a shoulder carried by each of said pole-pieces, a plate composed oi material of high magnetic reluctance carried by said shoulders and means tending to cause a magnetic flux between said spaced pole-pieces, said plate having a projection near each of said pole-pieces, said plate being composed of manganese steel.
7. A lifting magnet including a circular central pole-piece and a spaced annular pole piece concentric therewith, said pieces being composed of a ferrous metal of high magnetic susceptibility, an upper plate composed of material having the same characteristics and connecting said pole-pieces, an outer shoulder on said central piece and an inner shoulder on said annular piece, an annular plate composed of material of high magnetic reluctance and resting on said shoulders, said plate having an annular rib near one of said pole- )ieces.
8. A li ting magnet including a circular central pole-piece and a spaced annular pole piece concentric therewith, said pieces being composed of a ferrous metal of high magnetic susceptibility, an upper plate composed of material having the same characteristics and connecting said pole-pieces, an outer shoulder on said central piece and an inner shoulder on said annular piece, an annular plate composed of material of high magnetic reluctance and resting on said shoulders, said plate having an annular rib near each of said pole-pieces.
9. A lifting magnet including a circular central pole-piece and a spaced annular polepiece concentric therewith, said pieces being composed of a ferrous metal of high magnetic susceptibility, an upper plate composed of material having the same characteristics and connecting said pole-pieces, an outer shoulder on said central piece and an inner shoulder on said annular piece, an annular plate composed of material of high magnetic reluctance and resting on said shoulders, said plate having an annular rib near one of said pole-pieces, said plate being composed of manganese steel.
10. A lifting magnet including a circular central pole-piece and a spaced annular polepiece concentric therewith, said ieces being composed of a ferrous metal of ighmagnetic susceptibility, an upper plate composed of material having the same characteristics and connecting said pole-pieces, an outer shoulder on said central piece and an inner shoulder on said annular piece, an annular plate composed of material of high magnetic reluctance and resting on said shoulders, said plate having an annular rib near each of said pole-pieces, said plate being composed of manganese steel.
11. As a sub-combination of an electric lifting magnet, an annular plate of material of high magnetic reluctance having a pro jefcting portion spaced from an edge there- 0 12. As a sub-combination of an electric lifting magnet, an annular plate of material of high magnetic reluctance having a projecting portion spaced from each edge thereof.
13. As a sub-combination of an electric lifting magnet, an annular plate of material of high magnetic reluctance havin jectin annular rib portion spaced edge t ereof.
14. As a sub-combination of an electric lifting magnet, an annular plate of material of high magnetic reluctance having a proj ecting annular rib portion spaced from each edge thereof. a
15. As a sub-combination of an electric lifting magnet, an annular plate of manganese steel havin a pro ecting portlon spaced from an e ge thereof.
16. As a sub-combination of an electric lifting magnet, an annular plate of manganese steel having a projecting portion spaced from each edge thereof.
17. As a sub-combination of an electric lifting magnet, an annular plate of manganese steel havin a projecting annular rib portion spaced ilOl'Il an ed e thereof.
18. As a sub-combination 0 an electric lifting magnet, an annular plate of manganese steel having a projecting annular rib portion spaced from each edge thereof.
In testimony whereof, I hereunto afiix my signature.
FRANCIS W. JESSOP.
a proom an
US420377A 1930-01-13 1930-01-13 Lifting magnet Expired - Lifetime US1767458A (en)

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