US3773185A - Flexible magnet yoke for a crane - Google Patents
Flexible magnet yoke for a crane Download PDFInfo
- Publication number
- US3773185A US3773185A US00039773A US3773185DA US3773185A US 3773185 A US3773185 A US 3773185A US 00039773 A US00039773 A US 00039773A US 3773185D A US3773185D A US 3773185DA US 3773185 A US3773185 A US 3773185A
- Authority
- US
- United States
- Prior art keywords
- mast
- support
- crane
- magnet
- suspension
- 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
Links
- 239000000725 suspension Substances 0.000 claims abstract description 23
- 230000001419 dependent effect Effects 0.000 abstract description 2
- 230000006978 adaptation Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
Images
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
- B66C1/04—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
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C2700/00—Cranes
- B66C2700/01—General aspects of mobile cranes, overhead travelling cranes, gantry cranes, loading bridges, cranes for building ships on slipways, cranes for foundries or cranes for public works
- B66C2700/012—Trolleys or runways
- B66C2700/017—Installations characterised by their destination or by the load-engaging element for as far as the trolley is essential
Definitions
- ABSTRACT A crane having a pair of trolleys supported on its bridge and a mast dependent from each trolley has a support pivotally mounted on the mast for movement about a horizontal axis.
- a suspension bar is pivotally mounted on each end of the support for movement about an axis parallel to the support axis.
- a magnet is suspended from each of the suspension bars by means of a resilient support at each end of the bar.
- the supports for the magnets were of rigid construction so that the bottoms of the magnets were always horizontal and the magnets supported by any one mast were always in the same horizontal plane.
- the beams were perfectly square with its top in a single horizontal plane no problem resulted since there was full contact with the magnets.
- the beams it is very common for the beams to be out of square for various reasons. For example, the beam may have some twist in it or it may deflect due to its own weight. When this occurred the magnets could not be in full contact with the beam. This resulted in air gaps between the magnets and the beam which reduced the lifting power of the magnets drastically. This loss of lifting power sometimes resulted in dropping of the beam, thus damaging the beam and other materials or equipment. In addition, this presented a serious hazard to the workmen.
- FIG. 1 is a schematic elevation showing how the device of our ivnention is used in lifting a beam
- FIG. 2 is an elevation of a crane with the lifting yoke of our invention incorporated therein;
- FIG. 3 is a side view of FIG. 2;
- FIG. 4 is a sectional view showing a portion of the lower end of FIG. 2;
- FIG. 5 is a view taken on the line V ⁇ / of FIG. 4.
- reference numeral 2 indicates tracks on which a crane bridge 4 moves.
- Rails 6 are mounted on top of the bridge 4 for supporting two trolleys 8.
- the trolleys 8 are identical so that only one will be described in detail.
- a mast 10 is mounted on trolley 8 for vertical movement with respect thereto.
- a drum 12 is mounted on the trolley and is rotated by means of a motor l4.
- Sheaves-l6 are supported on each side of the bottom of mast 10 and a cable 18 surrounds the drum and sheaves.
- operation of the motor causes the mast to raise or lower.
- a magnet support or bracket 20 is secured to the bottom of mast 10.
- the support 20 has an opening 22 therethrough with aligned holes 24 through the walls of the opening.
- a magnet suspension support 26 is received in opening 22 and has a bushing 28 extending between side walls 30 of the support 26.
- the bushing 28 is arranged between and in axial alignment with the holes 24 and a pivot pin 32 passes therethrough with the suspension support 26 being free to pivot around the pin 32.
- the magnet suspension support 26 has an opening 33 therethrough with aligned holes 34 in the walls of the opening at each end of the magnet suspension support 26.
- a magnet suspension bar 36 is received in each end of opening 33 and includes a bushing 38 extending between side walls 37 of the bar 36.
- the bushing 38 is arranged in alignment with holes 34 and a pivot pin 40 passes through the bushing 38 and holes 34 with the suspension bar 36 being free to pivot around the axis of pin 40.
- a vertical sleeve 42 is secured to each end of the bar 36 between side walls 37 and a plate 44 is welded to the suspension bar 36 above the top of each sleeve 42 with a hole 45 being provided therethrough in alignment with the sleeve 42.
- Four pins 46 each having a shoulder 48 and a threaded upper portion 50, are welded to each plate 44 in spaced apart relationship.
- a hanger bolt 52 passes through the sleeve 42 and hole 45 and through hole 54 in a plate 55 resting on springs 56.
- Spring 56 surrounds each pin 46 with its ends bearing against plates 44 and 55.
- Nuts 58 are threaded on the top of pins 46 above the plate 54 and a nut 60 is threaded on bolt 52 above the plate 55.
- the lower end of the bolt 52 which has a hole 62 therethrough, is received between the sides of yoke 64 which have aligned holes 66 therein for receiving a pivot pin 68.
- the yoke 64 has a hole 70 therethrough at right angles to the holes 66.
- a pin 72 is slidably received in holes 66.
- a magnet 74 is secured to the ends of pins 72.
- a separator 76 is fastened to the pin 72 on each side of yoke 64.
- Bolt 52, yoke 64, pins 68 and 72, and separators 76 are made from non-magnetic material so that the magnetic flux is not dissipated above the bottom of the magnet. This insures that the maximum lifting power of the magnet is being used to lift and hold the workpiece.
- the length of pin 72 is slightly less than the width of magnet 74 and separators 76 are locked in place by means of bolts 77 thereby locking pin '72 in place and insuring that the maximum dimension of the magnet is the width of the magnet. It will be seen that the magnet 74 can pivot freely about the pins 68, that the magnet bars 36 can pivot freely about the pins 40, and that the magnet suspension support 26 can pivot freely about the pin 32.
- the springs 56 supporting hanger increases 52 incrases the flexibility of the magnet support and reduces shock loads on the magnet.
- the masts 10 are lowered until the magnets 74 rest on the workpiece W which is to be lifted, the magnets 74 are energized and the masts 10 are raised to bring the workpiece to the required elevation. Because of the pivoted connections the bottoms of the four magnets 74 will contact the top of the workpiece W over practically their entire surface whether the workpiece is on a slope in a direction parallel or at right angle to its length. As shown in FIG. 1, this contact remains even when the workpiece flexes during the lifting operation. Thus, maximum lifting power of the magnets is utilized.
- a crane comprising a mast, an elongated support, a bracket secured to the lower end of said mast, said bracket having generally parallel vertical sides forming an opening for receiving said elongated support, a first generally horizontal pivot pin supported by said parallel vertical sides on which said support is mounted for pivotal movement, a pair of suspension bars, spaced vertical walls in said support for receiving each of said suspension bars, a second generally horizontal pivot pin supporting each of said suspension bars for pivotal movement and supported by said spaced vertical walls, a generally vertical sleeve at each end of each suspenthe suspension bar.
- a crane according to claim 1 including a crane bridge, a pair of trolleys supported on said bridge for movement therealong, means supporting said mast on one of said trolleys for vertical movement, a second mast having an associated structure similar to said first mast, and means supporting said second mast on the other of said trolleys for vertical movement.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Carriers, Traveling Bodies, And Overhead Traveling Cranes (AREA)
Abstract
A crane having a pair of trolleys supported on its bridge and a mast dependent from each trolley has a support pivotally mounted on the mast for movement about a horizontal axis. A suspension bar is pivotally mounted on each end of the support for movement about an axis parallel to the support axis. A magnet is suspended from each of the suspension bars by means of a resilient support at each end of the bar. Thus, when an elongated object is picked up by the four magnets good contact is made by all four magnets.
Description
United States Patent 1191 Johnson et al.
[ Nov. 20, 1973 FLEXIBLE MAGNET YOKE FOR A CRANE [75 Inventors: Archie L. Johnson, Evergreen Park; Herbert H. Post,Chicago,
21 Appl. No.: 39,773
[52] US. Cl. 212/129, 294/655 [51] Int. Cl. 1366c 19/00 [58] Field of Search 212/10, 11, 42, 124,
FOREIGN PATENTS OR APPLICATIONS 211,586 3/1967 Sweden..... 294/655 486,001 3/1918 France ..294/65.5
Primary Examiner-Harvey C. l-lornsby Attorney-Rea C. Helm [57] ABSTRACT A crane having a pair of trolleys supported on its bridge and a mast dependent from each trolley has a support pivotally mounted on the mast for movement about a horizontal axis. A suspension bar is pivotally mounted on each end of the support for movement about an axis parallel to the support axis. A magnet is suspended from each of the suspension bars by means of a resilient support at each end of the bar. Thus,
1 References Cited when an elongated object is picked up by the four UNITED STATES PATENTS magnets good contact is made by all four magnets.
3,104,016 9/1963 l-larry 212 129 2 Claims, 5 Drawing Figures 3,513,987 5/1970 Seyff 212/128 2,204,207 6/1940 Coburn 212/11 PMENTED NOV 2 0 I973 INVENTORS ARCH/EL. JOHNSON 64 a HERBERTH posr Afro/nay PATENTED REV 20 I973 FIG. 3
INVENTORS ARCH/E L. JOHNSON & HERBERT H. POST W A florney PMENTED HUV 2 0 I973 SHIFT l CF 4 v QM l/VVE/VTORS ARCH/E L. JOHNSON a HERBERT H. P057 Attorney FLEXIBLE MAGNET YOKE FOR A CRANE This invention relates to a crane having two flexible magnet yokes and more particularly to such a crane for handling structural beams. in the cranes used prior to our invention the crane had two trolleys, each with a mast supporting two magnets. The supports for the magnets were of rigid construction so that the bottoms of the magnets were always horizontal and the magnets supported by any one mast were always in the same horizontal plane. When the beams were perfectly square with its top in a single horizontal plane no problem resulted since there was full contact with the magnets. However, it is very common for the beams to be out of square for various reasons. For example, the beam may have some twist in it or it may deflect due to its own weight. When this occurred the magnets could not be in full contact with the beam. This resulted in air gaps between the magnets and the beam which reduced the lifting power of the magnets drastically. This loss of lifting power sometimes resulted in dropping of the beam, thus damaging the beam and other materials or equipment. In addition, this presented a serious hazard to the workmen.
It is therefore an object of our invention to provide a crane having its magnets supported in such a manner that the load is supported over most of the bottom surface of the magnet.
This and other objects will be more apparent after referring to the following specification and attached drawings, in which:
FIG. 1 is a schematic elevation showing how the device of our ivnention is used in lifting a beam;
FIG. 2 is an elevation of a crane with the lifting yoke of our invention incorporated therein;
FIG. 3 is a side view of FIG. 2;
FIG. 4 is a sectional view showing a portion of the lower end of FIG. 2; and
FIG. 5 is a view taken on the line V\/ of FIG. 4.
Referring more particularly to the drawings, reference numeral 2 indicates tracks on which a crane bridge 4 moves. Rails 6 are mounted on top of the bridge 4 for supporting two trolleys 8. The trolleys 8 are identical so that only one will be described in detail. A mast 10 is mounted on trolley 8 for vertical movement with respect thereto. For this purpose a drum 12 is mounted on the trolley and is rotated by means of a motor l4. Sheaves-l6 are supported on each side of the bottom of mast 10 and a cable 18 surrounds the drum and sheaves. Thus, operation of the motor causes the mast to raise or lower. The parts so far described are conventional and form no part of the present invention.
A magnet support or bracket 20 is secured to the bottom of mast 10. The support 20 has an opening 22 therethrough with aligned holes 24 through the walls of the opening. A magnet suspension support 26 is received in opening 22 and has a bushing 28 extending between side walls 30 of the support 26. The bushing 28 is arranged between and in axial alignment with the holes 24 and a pivot pin 32 passes therethrough with the suspension support 26 being free to pivot around the pin 32. The magnet suspension support 26 has an opening 33 therethrough with aligned holes 34 in the walls of the opening at each end of the magnet suspension support 26. A magnet suspension bar 36 is received in each end of opening 33 and includes a bushing 38 extending between side walls 37 of the bar 36. The bushing 38 is arranged in alignment with holes 34 and a pivot pin 40 passes through the bushing 38 and holes 34 with the suspension bar 36 being free to pivot around the axis of pin 40. A vertical sleeve 42 is secured to each end of the bar 36 between side walls 37 and a plate 44 is welded to the suspension bar 36 above the top of each sleeve 42 with a hole 45 being provided therethrough in alignment with the sleeve 42. Four pins 46, each having a shoulder 48 and a threaded upper portion 50, are welded to each plate 44 in spaced apart relationship. A hanger bolt 52 passes through the sleeve 42 and hole 45 and through hole 54 in a plate 55 resting on springs 56. Spring 56 surrounds each pin 46 with its ends bearing against plates 44 and 55. Nuts 58 are threaded on the top of pins 46 above the plate 54 and a nut 60 is threaded on bolt 52 above the plate 55. The lower end of the bolt 52, which has a hole 62 therethrough, is received between the sides of yoke 64 which have aligned holes 66 therein for receiving a pivot pin 68. The yoke 64 has a hole 70 therethrough at right angles to the holes 66. A pin 72 is slidably received in holes 66. A magnet 74 is secured to the ends of pins 72. A separator 76 is fastened to the pin 72 on each side of yoke 64. Bolt 52, yoke 64, pins 68 and 72, and separators 76 are made from non-magnetic material so that the magnetic flux is not dissipated above the bottom of the magnet. This insures that the maximum lifting power of the magnet is being used to lift and hold the workpiece. The length of pin 72 is slightly less than the width of magnet 74 and separators 76 are locked in place by means of bolts 77 thereby locking pin '72 in place and insuring that the maximum dimension of the magnet is the width of the magnet. It will be seen that the magnet 74 can pivot freely about the pins 68, that the magnet bars 36 can pivot freely about the pins 40, and that the magnet suspension support 26 can pivot freely about the pin 32. The springs 56 supporting hanger increases 52 incrases the flexibility of the magnet support and reduces shock loads on the magnet.
In operation, the masts 10 are lowered until the magnets 74 rest on the workpiece W which is to be lifted, the magnets 74 are energized and the masts 10 are raised to bring the workpiece to the required elevation. Because of the pivoted connections the bottoms of the four magnets 74 will contact the top of the workpiece W over practically their entire surface whether the workpiece is on a slope in a direction parallel or at right angle to its length. As shown in FIG. 1, this contact remains even when the workpiece flexes during the lifting operation. Thus, maximum lifting power of the magnets is utilized.
While one embodiment of our invention has been shown and described, it will be apparent that other adaptations and modifications may be made without departing from the scope of the following claims.
We claim:
l. A crane comprising a mast, an elongated support, a bracket secured to the lower end of said mast, said bracket having generally parallel vertical sides forming an opening for receiving said elongated support, a first generally horizontal pivot pin supported by said parallel vertical sides on which said support is mounted for pivotal movement, a pair of suspension bars, spaced vertical walls in said support for receiving each of said suspension bars, a second generally horizontal pivot pin supporting each of said suspension bars for pivotal movement and supported by said spaced vertical walls, a generally vertical sleeve at each end of each suspenthe suspension bar.
2. A crane according to claim 1 including a crane bridge, a pair of trolleys supported on said bridge for movement therealong, means supporting said mast on one of said trolleys for vertical movement, a second mast having an associated structure similar to said first mast, and means supporting said second mast on the other of said trolleys for vertical movement.
UNITED STATES PATENT QFFICE CEHHCATE 6i fiREQ'HN November 20, 1973 Dated Patent No. 3, 773, 1 5
Inventor(s) Archie L. Johnson, et a1.
It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:
Signed and sealed this 30th day of April 197A.
(SEAL) Attest:
EDWARD M.FLETCHER,JR. C. MARSHALL DANN Attesting Officer Commissioner of Patents USCOMM-DC 60376-P69 FORM PO-IOSO (10-69) u.s, eovznumzu'r PRINTING OFFICE 19w o-aea-au.
Claims (2)
1. A crane comprising a mast, an elongated support, a bracket secured to the lower end of said mast, said bracket having generally parallel vertical sides forming an opening for receiving said elongated support, a first generally horizontal pivot pin supported by said parallel vertical sides on which said support is mounted for pivotal movement, a pair of suspension bars, spaced vertical walls in said support for receiving each of said suspension bars, a second generally horizontal pivot pin supporting each of said suspension bars for pivotal movement and supported by said spaced vertical walls, a generally vertical sleeve at each end of each suspension bar, a hanger bolt extending through each sleeve with a space between the hanger bolt and the sleeve, a plate surrounding each hanger bolt above the top of said suspension bar, springs bearing against the bottom of said plate biasing said hanger bolt upwardly, a magnet associated with each suspension bar, a clevis attached to each end of the associated magnet, and a pivot pin connecting the bottom end of each hanger bolt to the associated magnet, the axis of said pivot pin being normal to the vertical plane through the axis of the suspension bar.
2. A crane according to claim 1 including a crane bridge, a pair of trolleys supported on said bridge for movement therealong, means supporting said mast on one of said trolleys for vertical movement, a second mast having an associated structure similar to said first mast, and means supporting said second mast on the other of said trolleys for vertical movement.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US3977370A | 1970-05-22 | 1970-05-22 |
Publications (1)
Publication Number | Publication Date |
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US3773185A true US3773185A (en) | 1973-11-20 |
Family
ID=21907275
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00039773A Expired - Lifetime US3773185A (en) | 1970-05-22 | 1970-05-22 | Flexible magnet yoke for a crane |
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US (1) | US3773185A (en) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3304515A (en) * | 1958-11-24 | 1967-02-14 | Telefunken Gmbh | Random pulse generator |
US3968986A (en) * | 1974-08-08 | 1976-07-13 | Kohan Sendan Kikai Kabushikikaisha | Electromagnetic lifting device |
WO1995006613A1 (en) * | 1993-09-01 | 1995-03-09 | Krupp Fördertechnik Gmbh | Transfer device for large containers |
US5803280A (en) * | 1993-06-03 | 1998-09-08 | Krupp Fordertechnik Gmbh | Lifting and transport apparatus for transcontainers |
US6428267B1 (en) * | 1998-09-30 | 2002-08-06 | Gilman Engineering & Manufacturing Co., Llc | Pick and place device having two parallel axes |
US20080265498A1 (en) * | 2007-04-25 | 2008-10-30 | Murata Machinery, Ltd. | Work sheet conveying device |
US20080265500A1 (en) * | 2007-04-25 | 2008-10-30 | Murata Machinery, Ltd. | Work sheet conveying system |
US20130309044A1 (en) * | 2012-05-08 | 2013-11-21 | Swick Mining Services Ltd. | Rod Handling Assembly |
RU202746U1 (en) * | 2020-06-18 | 2021-03-04 | Открытое Акционерное Общество "Российские Железные Дороги" | Magnetic traverse for moving metal loads |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR486001A (en) * | 1917-06-30 | 1918-03-05 | Societe Centrale D Entreprises Armand D Riviere & | Electro-magnetic device for lifting pig iron |
US2204207A (en) * | 1938-04-18 | 1940-06-11 | Manning Maxwell & Moore Inc | Method of handling magnetizable plates and apparatus therefor |
US3104016A (en) * | 1957-12-16 | 1963-09-17 | Alliance Machine Co | Coil handling crane |
US3513987A (en) * | 1967-08-12 | 1970-05-26 | Gen Electric Canada | Three-crane lifting beam |
-
1970
- 1970-05-22 US US00039773A patent/US3773185A/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR486001A (en) * | 1917-06-30 | 1918-03-05 | Societe Centrale D Entreprises Armand D Riviere & | Electro-magnetic device for lifting pig iron |
US2204207A (en) * | 1938-04-18 | 1940-06-11 | Manning Maxwell & Moore Inc | Method of handling magnetizable plates and apparatus therefor |
US3104016A (en) * | 1957-12-16 | 1963-09-17 | Alliance Machine Co | Coil handling crane |
US3513987A (en) * | 1967-08-12 | 1970-05-26 | Gen Electric Canada | Three-crane lifting beam |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3304515A (en) * | 1958-11-24 | 1967-02-14 | Telefunken Gmbh | Random pulse generator |
US3968986A (en) * | 1974-08-08 | 1976-07-13 | Kohan Sendan Kikai Kabushikikaisha | Electromagnetic lifting device |
US5803280A (en) * | 1993-06-03 | 1998-09-08 | Krupp Fordertechnik Gmbh | Lifting and transport apparatus for transcontainers |
WO1995006613A1 (en) * | 1993-09-01 | 1995-03-09 | Krupp Fördertechnik Gmbh | Transfer device for large containers |
US6428267B1 (en) * | 1998-09-30 | 2002-08-06 | Gilman Engineering & Manufacturing Co., Llc | Pick and place device having two parallel axes |
US20080265498A1 (en) * | 2007-04-25 | 2008-10-30 | Murata Machinery, Ltd. | Work sheet conveying device |
US20080265500A1 (en) * | 2007-04-25 | 2008-10-30 | Murata Machinery, Ltd. | Work sheet conveying system |
US20130309044A1 (en) * | 2012-05-08 | 2013-11-21 | Swick Mining Services Ltd. | Rod Handling Assembly |
US9926752B2 (en) * | 2012-05-08 | 2018-03-27 | Swick Mining Services Ltd. | Rod handling assembly |
RU202746U1 (en) * | 2020-06-18 | 2021-03-04 | Открытое Акционерное Общество "Российские Железные Дороги" | Magnetic traverse for moving metal loads |
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Legal Events
Date | Code | Title | Description |
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AS | Assignment |
Owner name: USX CORPORATION, A CORP. OF DE, STATELESS Free format text: MERGER;ASSIGNOR:UNITED STATES STEEL CORPORATION (MERGED INTO);REEL/FRAME:005060/0960 Effective date: 19880112 |