EP0068988B1 - Locking mechanisms and method of magnetizing a locking magnet therefor - Google Patents

Locking mechanisms and method of magnetizing a locking magnet therefor Download PDF

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Publication number
EP0068988B1
EP0068988B1 EP82401109A EP82401109A EP0068988B1 EP 0068988 B1 EP0068988 B1 EP 0068988B1 EP 82401109 A EP82401109 A EP 82401109A EP 82401109 A EP82401109 A EP 82401109A EP 0068988 B1 EP0068988 B1 EP 0068988B1
Authority
EP
European Patent Office
Prior art keywords
magnet
locking
magnets
strength
opposite
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
Application number
EP82401109A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0068988A1 (en
Inventor
Bruce Samuel Sedley
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to AT82401109T priority Critical patent/ATE15521T1/de
Publication of EP0068988A1 publication Critical patent/EP0068988A1/en
Application granted granted Critical
Publication of EP0068988B1 publication Critical patent/EP0068988B1/en
Expired legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
    • E05B27/00—Cylinder locks or other locks with tumbler pins or balls that are set by pushing the key in
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
    • E05B47/00—Operating or controlling locks or other fastening devices by electric or magnetic means
    • E05B47/0038—Operating or controlling locks or other fastening devices by electric or magnetic means using permanent magnets
    • E05B47/0043—Mechanical locks operated by cards having permanent magnets
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F13/00—Apparatus or processes for magnetising or demagnetising
    • H01F13/003—Methods and devices for magnetising permanent magnets
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/02—Permanent magnets [PM]
    • 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
    • H01F7/0242—Magnetic drives, magnetic coupling devices

Definitions

  • This invention relates to magnetic key operated locks.
  • This invention also relates to a method of magnetizing a locking magnet therefore.
  • the locking mechanisms disclosed in the above noted prior art include a sliding block provided with a plurality of bores or recesses in which cylindrical shaped magnets are slidably received. When the mechanism is locked these magnets are attracted to a position in which they enter corresponding holes in a fixed locking plate thus preventing sliding unlocking movement of the block until a proper magnetic key is inserted in the mechanism to repel the magnets out of the locking plate holes.
  • the spacing between usable holes in the sliding block has been required to be relatively large due to interaction between adjacent magnets. It has been necessary to space adjacent magnets sufficiently far apart so that movement of one magnet does not cause corresponding movement of an adjacent magnet, or the proximity of magnets could prevent desired movement of one or more of them. Naturally this limits the number of magnets that may be employed within a given area and reduces the possible number of code combinations.
  • the purpose of the present invention is to improve magnetic key operated locking devices by permitting adjacent magnets to be placed closer together than has heretofore been possible.
  • the locking mechanism that includes a pair of magnets in side by side spaced apart relationship is characterized in that one pair of corresponding ends (S) of said magnets are each magnetized to provide a magnetic field of relatively low strength while the opposite pair of corresponding ends (N) are magnetized to provide magnetic fields of relatively high strength.
  • the magnetic key operated locking mechanism that includes a slidable core movable from a locked position to an unlocking position by a properly coded magnetic key and formed with a plurality of recesses each containing a magnet with each of said magnets being slidable along said recesses between locking and unlocking positions, is characterized in that one pair of corresponding ends (S) of said magnets are each magnetized to provide a magnetic field of relatively low strength while the opposite pair of corresponding ends (N) are magnetized to provide magnetic fields of relatively high strength.
  • the method of magnetizing a locking magnet for use in the locking mechanism defined above comprising the step of providing a locking magnet having its opposite ends magnetized to provide magnetic fields of substantially equal strength, is characterized in that said method moreover comprises the steps of:
  • a portion of a magnetic card key operated lockset including a nonmagnetic slidable block or core 10 in which are formed a plurality of transversely extending bores 12 in which are slidably received elongated cylindrical magnets 14.
  • core 10 is a stationary nonmagnetic locking plate 16 formed with holes 18 into which the adjacent ends of magnets 14 are adapted to be received to prevent downward movement of core 10 when the lockset is in locked condition.
  • a fixed nonmagnetized cover plate 20 Positioned next to locking plate 16 is a fixed nonmagnetized cover plate 20 which is interposed between locking plate 16 and a fixed magnetizable shield plate 22. This shield plate aids in magnetically anchoring the magnets within holes 18 when the lockset is locked.
  • Fig. 2A the above noted structure is shown in greater detail with the distance between adjacent bores 12 relatively closer than shown in Fig. 1.
  • magnets 14 are magnetized in the conventional manner with the end surfaces of equal and opposite magnetized strengths indicated by N and S then when the magnets are relatively close together there is a magnetic attraction between the north pole of each magnet and the south pole of the adjacent magnet as indicated by the full line arrows in Fig. 2A.
  • the undesirable result of this is that if a properly coded card key 24 is inserted in the lockset and such key is provided with two magnetic north pole spots 23 to repel both the upper and lower magnets out of the locking plate 16 then either the upper or lower magnet may remain in locking position due to the stronger action of the adjacent magnet. This interaction of closely adjacent magnets prevents the lock from being opened by a properly coded key.
  • Another result of having conventionally magnetized magnets too close together is that, after a plurality of adjacent magnets have been repelled into core 10 by a properly magnetized magnetic card key they may not all return to their locking positions in locking plate 16 after the key has been removed despite the attraction of shield plate 22.
  • the full strength magnet 14 is preferably of alnico 6 grade material and is first magnetically connected to another magnet 30 of somewhat stronger field strength than magnet 14, and preferably ceramic.
  • the strength of each pole of magnet 14 is about 500 gauss then the strength of each pole of ceramic magnet 30 should preferably be about 600 gauss.
  • a strong magnetizing field is then applied to the upper mouth pole of magnet 14 by a capacitance discharge device which includes a core 32 and windings 34.
  • This sort of device is disclosed in U.S. Patent No. 4 128 851 and is wired so as to provide a collapsing field to reverse the polarity of the upper pole of magnet 14 from south to north as seen in Fig. 5.
  • the polarity reversal may result in creation of a new north pole of about 450 gauss while the opposite south pole attains a pole strength of 200 gauss or less.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Mechanical Engineering (AREA)
  • Lock And Its Accessories (AREA)
  • Supporting Of Heads In Record-Carrier Devices (AREA)
  • Adornments (AREA)
  • Dc Machiner (AREA)
  • Purses, Travelling Bags, Baskets, Or Suitcases (AREA)
  • Connections Arranged To Contact A Plurality Of Conductors (AREA)
  • Details Of Connecting Devices For Male And Female Coupling (AREA)
  • Burglar Alarm Systems (AREA)
  • Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
  • Buckles (AREA)
  • Walking Sticks, Umbrellas, And Fans (AREA)
  • Magnetic Treatment Devices (AREA)
  • Discharge Heating (AREA)
  • Adhesives Or Adhesive Processes (AREA)
EP82401109A 1981-06-22 1982-06-18 Locking mechanisms and method of magnetizing a locking magnet therefor Expired EP0068988B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82401109T ATE15521T1 (de) 1981-06-22 1982-06-18 Schliessmechanismen und verfahren zum magnetisieren eines schliessmagneten dafuer.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US27597981A 1981-06-22 1981-06-22
US275979 1981-06-22

Publications (2)

Publication Number Publication Date
EP0068988A1 EP0068988A1 (en) 1983-01-05
EP0068988B1 true EP0068988B1 (en) 1985-09-11

Family

ID=23054622

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82401109A Expired EP0068988B1 (en) 1981-06-22 1982-06-18 Locking mechanisms and method of magnetizing a locking magnet therefor

Country Status (12)

Country Link
EP (1) EP0068988B1 (enrdf_load_stackoverflow)
JP (1) JPS584070A (enrdf_load_stackoverflow)
KR (1) KR910002019B1 (enrdf_load_stackoverflow)
AT (1) ATE15521T1 (enrdf_load_stackoverflow)
AU (1) AU549917B2 (enrdf_load_stackoverflow)
CA (1) CA1227654A (enrdf_load_stackoverflow)
DE (2) DE3266179D1 (enrdf_load_stackoverflow)
ES (1) ES513264A0 (enrdf_load_stackoverflow)
HK (1) HK61187A (enrdf_load_stackoverflow)
MX (1) MX156554A (enrdf_load_stackoverflow)
PH (1) PH22562A (enrdf_load_stackoverflow)
SG (1) SG33587G (enrdf_load_stackoverflow)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU570031B2 (en) * 1983-03-17 1988-03-03 Lowe & Fletcher Limited Magnetising apparatus
DE19807663A1 (de) * 1998-02-24 1999-09-09 Baur Verbindungsmittel zum lösbaren Verbinden eines ersten Bauteils und eines zweiten Bauteils und Verfahren zum Lösen einer Verbindung eines ersten Bauteils und eines zweiten Bauteils
US8540292B2 (en) 2002-12-03 2013-09-24 Edward B. Ferguson Reversible magnetic door stop/latch
US6588811B1 (en) 2002-12-03 2003-07-08 Edward B. Ferguson Reversible magnetic door stop/latch

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4133194A (en) * 1976-12-02 1979-01-09 Bruce S. Sedley Magnetic key operated door lock
CH620492A5 (en) * 1977-07-25 1980-11-28 Fichtel & Sachs Ag Magnetically actuable rotary cylinder lock, key and method and device for the magnetic coding of the key

Also Published As

Publication number Publication date
JPS584070A (ja) 1983-01-11
SG33587G (en) 1987-07-17
EP0068988A1 (en) 1983-01-05
ES8307327A1 (es) 1983-07-01
KR910002019B1 (ko) 1991-03-30
AU8508982A (en) 1983-01-06
DE3266179D1 (en) 1985-10-17
DE68988T1 (de) 1983-05-11
PH22562A (en) 1988-10-17
CA1227654A (en) 1987-10-06
JPH03477B2 (enrdf_load_stackoverflow) 1991-01-08
HK61187A (en) 1987-08-28
ATE15521T1 (de) 1985-09-15
KR840000725A (ko) 1984-02-27
MX156554A (es) 1988-09-09
AU549917B2 (en) 1986-02-20
ES513264A0 (es) 1983-07-01

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