GB1372244A - Electromechanically switched permanent magnet holding device - Google Patents
Electromechanically switched permanent magnet holding deviceInfo
- Publication number
- GB1372244A GB1372244A GB5079771A GB5079771A GB1372244A GB 1372244 A GB1372244 A GB 1372244A GB 5079771 A GB5079771 A GB 5079771A GB 5079771 A GB5079771 A GB 5079771A GB 1372244 A GB1372244 A GB 1372244A
- Authority
- GB
- United Kingdom
- Prior art keywords
- keeper
- load
- poles
- magnetic
- pole
- 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
Links
- 125000006850 spacer group Chemical group 0.000 abstract 3
- 238000004804 winding Methods 0.000 abstract 3
- 229910001209 Low-carbon steel Inorganic materials 0.000 abstract 2
- 239000003990 capacitor Substances 0.000 abstract 2
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 230000004907 flux Effects 0.000 abstract 1
- 230000005404 monopole Effects 0.000 abstract 1
- 238000000926 separation method Methods 0.000 abstract 1
- 229910001220 stainless steel Inorganic materials 0.000 abstract 1
- 239000010935 stainless steel Substances 0.000 abstract 1
- 229910052712 strontium Inorganic materials 0.000 abstract 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 abstract 1
- 229910000859 α-Fe Inorganic materials 0.000 abstract 1
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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/02—Permanent magnets [PM]
- H01F7/0231—Magnetic circuits with PM for power or force generation
- H01F7/0252—PM holding devices
-
- 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
- H01F7/064—Circuit arrangements for actuating electromagnets
-
- 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
- H01F2007/208—Electromagnets for lifting, handling or transporting of magnetic pieces or material combined with permanent magnets
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F29/00—Variable transformers or inductances not covered by group H01F21/00
- H01F29/14—Variable transformers or inductances not covered by group H01F21/00 with variable magnetic bias
- H01F2029/143—Variable transformers or inductances not covered by group H01F21/00 with variable magnetic bias with control winding for generating magnetic bias
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Mechanical Engineering (AREA)
- Load-Engaging Elements For Cranes (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
1372244 Load handling MULLARD Ltd 2 Nov 1971 50797/71 Heading B8H [Also in Divisions H1 H2 and H3] A magnetic holding device 1, e.g. for lifting loads comprises strontium ferrite permanent magnets 2 interposed between mild steel plate poles 3, 4, 5, 6; a control winding 7 surrounding the upper parts of poles 4, 5 and stainless steel members with stops 9 being secured to poles 3, 6 to limit movement of a mild steel keeper to and from the pole faces. The keeper has a central lifting eye 11, and non-magnetic headed spacer rods 12 extend from the upper face of the keeper for a distance equal to the length of the poles 3, 4, 5, 6, + a maximum operating airgap, and are a sliding fit in bores of poles 3, 6. A non-magnetic control rod 14 with stop 15 at upper end slides in bore 16 of pole 4, and operates a monopole microswitch S1 and bipole changeover switch S2 (not shown) mounted on top of keeper 10, so that S2 operates before S1; whenever load 17 and keeper 10 are at a critical separation exceeding the length of spacers 12. On lowering the device to a floor to lift or release a load, capacitor C (Fig. 2) previously charged from battery 19 is switched to discharge into base of transistor 20 which conducts batteries 18, 19 to pulse winding 7, so that the magnet switches from a first to a second condition in which the attraction between poles and load is increased and that between poles and keeper is decreased. The keeper plate 10 is released and lifted by spacing rods 12 abutting the load, and after the energizing pulse the magnet flux threads and retains load 17. On lifting, S 1 recharges the capacitor and S 2 remains closed; the keeper bearing on stops 9. On again lowering, the keeper plate 10 is released towards the upper poles, S 2 reverses the connections to winding 7, and S 1 discharges C to reverse the magnetic circuit condition, so that the pole-keeper attraction exceeds the pole-load attraction, and the spacer rods slidably displace the load so that the holding device may be lifted clear (Figs. 3-7, not shown). A graph (Fig. 8, not shown) gives the relationships between load and non-magnetic gap between poles and load, and constructional constants are quoted.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB50797D GB50797A (en) | 1971-11-02 | ||
| GB5079771A GB1372244A (en) | 1971-11-02 | 1971-11-02 | Electromechanically switched permanent magnet holding device |
| US00302132A US3798581A (en) | 1971-11-02 | 1972-10-30 | Electro-mechanically switched permanent magnet holding device |
| FR7243979A FR2209707B1 (en) | 1971-11-02 | 1972-12-11 | |
| DE2261282A DE2261282A1 (en) | 1971-11-02 | 1972-12-15 | ELECTROMECHANICALLY SWITCHED HOLDING DEVICE WITH A PERMANENT MAGNET |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB5079771A GB1372244A (en) | 1971-11-02 | 1971-11-02 | Electromechanically switched permanent magnet holding device |
| FR7243979A FR2209707B1 (en) | 1971-11-02 | 1972-12-11 | |
| DE2261282A DE2261282A1 (en) | 1971-11-02 | 1972-12-15 | ELECTROMECHANICALLY SWITCHED HOLDING DEVICE WITH A PERMANENT MAGNET |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1372244A true GB1372244A (en) | 1974-10-30 |
Family
ID=27184899
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB50797D Active GB50797A (en) | 1971-11-02 | ||
| GB5079771A Expired GB1372244A (en) | 1971-11-02 | 1971-11-02 | Electromechanically switched permanent magnet holding device |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB50797D Active GB50797A (en) | 1971-11-02 |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US3798581A (en) |
| DE (1) | DE2261282A1 (en) |
| FR (1) | FR2209707B1 (en) |
| GB (2) | GB1372244A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2205445A (en) * | 1987-05-22 | 1988-12-07 | Josef David Baumann | Magnetic lifting device for ferromagnetic loads |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2351480A1 (en) * | 1976-05-14 | 1977-12-09 | Materiel Magnetique | MAGNETIC CONTROL DEVICE WITH PERMANENT MAGNETS, CAPABLE OF PRODUCING MAGNETIC INDUCTION IN TWO SEPARATE GAPS |
| JPS55106743A (en) * | 1979-02-08 | 1980-08-15 | Inoue Japax Res Inc | Magnetic chuck |
| US4461207A (en) * | 1980-11-17 | 1984-07-24 | International Business Machines Corporation | Actuator mechanism for a printer or the like using dual magnets |
| JPH053508Y2 (en) * | 1987-06-26 | 1993-01-27 | ||
| US5630634A (en) * | 1994-12-27 | 1997-05-20 | Michael W. Stowe | Device for magnetically engaging objects having variable surface contours |
| FI20105582A0 (en) | 2010-05-25 | 2010-05-25 | Kaarinan Robottileikkaus Oy | Fastening device, arrangement and method for attaching an object to be processed on a machining base |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3257141A (en) * | 1963-06-17 | 1966-06-21 | Indiana General Corp | Magnetic transfer device |
| US3316514A (en) * | 1965-03-29 | 1967-04-25 | Westinghouse Electric Corp | Fail safe electro-magnetic lifting device with safety-stop means |
| US3389356A (en) * | 1965-08-23 | 1968-06-18 | American Chain & Cable Co | Fail-safe permanent magnet lifting device with a movable bias keeper |
| FR1531933A (en) * | 1967-07-19 | 1968-07-05 | Westinghouse Electric Corp | Flux transfer lifting magnet |
| DE1756503C3 (en) * | 1968-05-30 | 1973-07-19 | Koppers Gmbh Heinrich | Device for displaying loads hanging on lifting magnets |
| US3683239A (en) * | 1971-06-17 | 1972-08-08 | Oded E Sturman | Self-latching solenoid actuator |
-
0
- GB GB50797D patent/GB50797A/en active Active
-
1971
- 1971-11-02 GB GB5079771A patent/GB1372244A/en not_active Expired
-
1972
- 1972-10-30 US US00302132A patent/US3798581A/en not_active Expired - Lifetime
- 1972-12-11 FR FR7243979A patent/FR2209707B1/fr not_active Expired
- 1972-12-15 DE DE2261282A patent/DE2261282A1/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2205445A (en) * | 1987-05-22 | 1988-12-07 | Josef David Baumann | Magnetic lifting device for ferromagnetic loads |
| GB2205445B (en) * | 1987-05-22 | 1991-01-23 | Josef David Baumann | Magnetic retaining devices for lifting ferromagnetic loads |
Also Published As
| Publication number | Publication date |
|---|---|
| DE2261282A1 (en) | 1974-06-20 |
| GB50797A (en) | |
| FR2209707A1 (en) | 1974-07-05 |
| US3798581A (en) | 1974-03-19 |
| FR2209707B1 (en) | 1977-07-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |