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US3314707A - Magnetic door latch - Google Patents

Magnetic door latch Download PDF

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Publication number
US3314707A
US3314707A US471853A US47185365A US3314707A US 3314707 A US3314707 A US 3314707A US 471853 A US471853 A US 471853A US 47185365 A US47185365 A US 47185365A US 3314707 A US3314707 A US 3314707A
Authority
US
United States
Prior art keywords
bolt
guide
door
latch
magnetic
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
Application number
US471853A
Other languages
English (en)
Inventor
Wilhelmus Hendrickus Donselaar
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.)
US Philips Corp
North American Philips Co Inc
Original Assignee
US Philips Corp
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 US Philips Corp filed Critical US Philips Corp
Priority to US471823A priority Critical patent/US3394367A/en
Application granted granted Critical
Publication of US3314707A publication Critical patent/US3314707A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05C—BOLTS OR FASTENING DEVICES FOR WINGS, SPECIALLY FOR DOORS OR WINDOWS
    • E05C19/00—Other devices specially designed for securing wings, e.g. with suction cups
    • E05C19/16—Devices holding the wing by magnetic or electromagnetic attraction
    • E05C19/163—Devices holding the wing by magnetic or electromagnetic attraction a movable bolt being held in the striker by a permanent magnet
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05C—BOLTS OR FASTENING DEVICES FOR WINGS, SPECIALLY FOR DOORS OR WINDOWS
    • E05C19/00—Other devices specially designed for securing wings, e.g. with suction cups
    • E05C19/16—Devices holding the wing by magnetic or electromagnetic attraction
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T292/00—Closure fasteners
    • Y10T292/08—Bolts
    • Y10T292/0876—Double acting
    • Y10T292/0877—Sliding and swinging
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T292/00—Closure fasteners
    • Y10T292/11—Magnetic

Definitions

  • the invention relates to a magnetic latch for a door and the like comprising a bolt which cooperates magnetically with a keeper.
  • the bolt is slideably arranged in a tiltable guide, the bolt and the keeper being separated from one another by tilting of the guide.
  • a blocking mechanism which prevents tilting of the guide is coupled to a door knob shaft which is pushed or pulled in the direc tion of door opening movement, the blocking mechanism being removed by pulling or pushing the knob.
  • the bolt is slideably arranged in the guide so that magnetic attraction extends or retracts the bolt automatically relative to the tilting guide. Since the bolt is extended when the guide tilts, it is necessary that the hole in the cover plate is much wider than the width of the bolt. As a result of this, dirt can enter through the aperture in the cover plate as a result of which the locking device will operate less satisfactorily in time.
  • the invention over-comes this problem since the guide is arranged rotatably within a housing and the axis of rotation of the guide extends parallel to the tilt axis of the bolt. Also the bolt lies inside the rotatable guide and only a slight amount of plate exists so that dust and the like are substantially excluded.
  • An object of the invention is to provide a magnetic latch having a pushepull knob releasing mechanism.
  • Another object of the invention is to provide a latch in which the bolt is entirely retracted when the door is open.
  • Another object of the invention is to provide a magnetic latch in which the bolt extends and retracts solely under the influence of magnetic attraction.
  • the drawing shows a perspective view of a magnetic latch according to the invention partially broken away and in which the parts are shown in the rest position.
  • This magnetic latch a so-called push-pull latch, consists of a metal housing 1 having a brass cover plate 2 in which a rectangular aperture 3 is provided.
  • the magnetic bolt 4 is slideable within a bronze guide 5.
  • the magnetic bolt 4 consists of a sandwich composed of a flat oxide ceramic permanent magnet 6 of Ferroxdure, between two soft iron pole plates 7 and 8.
  • the magnetic bolt 4 can move substantially without friction relative to the guide 5.
  • the bolt When attracted by a keeper, the bolt emerges from the guide 5 and projects through the aperture 3 in plate 2.
  • the distance the bolt projects outwardly beyond the cover plate is determined by a stop member 11 which is secured to the pole plate 8, and a small adjusting screw (not visible in the drawing) provided on the front of the guide 5 extending into a threaded bore in the side 10.
  • the stop 11 moves within the slot 9 within which the end of said screw projects.
  • the guide 5 is suspended in the casing 1 by pivots 12 and 13 and can therefore rotate in a restricted are. In the rest position, the guide 5 engages that side of the casing which is located opposite to the points 12 and 13 (i.e. the side 31).
  • the magnetic lock further comprises a blocking mechanism for the guide.
  • This blocking mechanism comprises a nylon pawl 14, which has a triangular cross section and rotates around the shaft 15 at its apex, and of a coupling arm 16 which is also rotatably connected to the shaft 15 and pawl 14 via the levers 17 and 18.
  • the shaft 15 sup- United States Patent 0 ports a helical spring 19 one end of which is threaded in a hole in the pawl 14, as indicated in the drawing, and the other end 20 loops over the coupling arm 16.
  • a brass sleeve 21 is attached to the inner end of the guide 5 so that it lies behind the pawl 14 in the rest position.
  • Two upright studs 22, form abutment members against which the pawl 14 is held by the spring 19.
  • the coupling arm 16 abuts the wall 31 of the casing 1 against which the guide 5 is also held by magnetic attraction.
  • the coupling arm 16 has an elongated hole 23 which corresponds to two oppositely located holes (not shown) in the walls of the casing 1 through which extends the operating shaft 24 in the of the lock.
  • This shaft 24 is provided with two abutment sleeves 25A and 25B each of which are normally spaced a distance from the coupling arm 16.
  • the shaft 24 is provided at each end with a door knob 27 and can move the coupling arm 16 out of its rest position when a knob is pushed in the direction opening the door or pulled in this direction.
  • a helical spring 26 surrounding sleeve 25B serves for returning the shaft 24 to its initial position.
  • the magnetic latch further comprises a soft iron keeper 28 having a wedge shaped rise 29 and a recess 30. When the latch is mounted in a door, the keeper is attached to the door jamb by means of, for example, wood screws.
  • the appropriate knob is pulled or pushed, as a result of which the coupling arm 16 is moved out of its initial position while simultaneously a force is exerted on the door in the direction for opening. Movement of the coupling arm 16 rotates the pawl 14 so that the guide 5, hinged at points 12 and 13, is no longer held against rotation by the pawl. The force exerted on the door now causes the guide to rotate as the door moves in the direction of the opening.
  • the bolt 4 in the guide 5 will first tilt a little on the keeper 28 around the wedge-shaped rise 29. This strongly reduces the magnetic attraction (on the order of magnitude 10 kg.), since the bolt is inclined as a result of the tilting and side 8 of the bolt readily slides over the rise 29 of the keeper 28.
  • the bolt 4 When the door is further opened the bolt 4 is separated from the keeper and the bolt 4 is automatically retracted into guide 5 by magnetic action, whether the knob 27 has or has not been released.
  • the guide 5, which is still tilted, will return to its initial position as a result of the attraction between the bolt 4 and the iron Wall 31 of the casing.
  • the brass sleeve 21 then passes the pawl 14 if the knob has not yet been released.
  • the brass sleeve 21 engages the pawl 14 and by virtue of the leverage provided by properly dimensioning the appropriate parts the force of spring 19, holding the arm 16 against wall 31, is overcome and the sleeve 21 slips behind the pawl into its blocked position.
  • a latch for a door comprising in combination with a housing, a bolt of permanent magnet material, guide means supporting said bolt for free relative sliding movement, means pivotally supporting said guide means for rotation about an axis substantially normal to the sliding axis of said bolt, door knob :means and means operatively connected with said door knob means for holding said guide means against pivotal movement and releasing said guide means; and a soft iron keeper for engaging said bolt.
  • said means operatively connected with said door knob means comprises a pawl member having an integral coupling lever, means for pivotally supporting said pawl member for movement from a position engaging said guide means to a position remote from said guide means, spring means for biasing said pawl member and coupling lever into said blocking position, and means connecting said coupling lever with said door knob means.
  • a latch according to claim 3 wherein said housing against the Wall 31 of the comprises a soft iron portion located relative to said guide member a distance equal to approximately three quarters of the length of said bolt for attracting said bolt and guide.
  • a latch for a door comprising in combination, a hollow guide member of non-magnetic material, a bolt of permanent magnetic material receivable within said guide member for sliding movement relative thereto, means for pivotally mounting said guide member, a triangular pawl member for blocking pivotal movement of said guide member in a first position thereof, means for pivotally supporting said pawl member at the apex thereof and biasing said pawl member to its blocking position, a knob and associated means, means coupling said pawl member and said knob means for moving said pawl out of said blocking position, and a latch housing member having a soft iron portion positioned relative to said guide member for returning said guide to said first position by magnetic attraction between said bolt and said soft iron portion.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Closing And Opening Devices For Wings, And Checks For Wings (AREA)
  • Lock And Its Accessories (AREA)
  • Basic Packing Technique (AREA)
US471853A 1964-07-29 1965-07-14 Magnetic door latch Expired - Lifetime US3314707A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US471823A US3394367A (en) 1965-07-14 1965-07-14 Symbol generator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6408628A NL6408628A (es) 1964-07-29 1964-07-29

Publications (1)

Publication Number Publication Date
US3314707A true US3314707A (en) 1967-04-18

Family

ID=19790646

Family Applications (1)

Application Number Title Priority Date Filing Date
US471853A Expired - Lifetime US3314707A (en) 1964-07-29 1965-07-14 Magnetic door latch

Country Status (6)

Country Link
US (1) US3314707A (es)
BE (1) BE667471A (es)
DE (1) DE1553415A1 (es)
ES (1) ES315864A1 (es)
GB (1) GB1108996A (es)
NL (1) NL6408628A (es)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4822085A (en) * 1986-12-22 1989-04-18 Texim International Adjustable magnetic door latch system
EP1568836A2 (en) * 2004-02-24 2005-08-31 D & Group Pty Limited A Self-latching magnetic latching device
FR2881166A1 (fr) * 2005-01-21 2006-07-28 Arelec Soc Par Actions Simplif Systeme de verrouillage a liberation par pression ou traction
US20080296915A1 (en) * 2004-02-24 2008-12-04 D & D Group Pty Limited Magnetic latch
USD647782S1 (en) 2011-02-04 2011-11-01 D&D Group Pty Ltd Latch
USD647779S1 (en) 2011-02-04 2011-11-01 D & D Group Pty Ltd Hinge
USD647781S1 (en) 2011-02-04 2011-11-01 D&D Group Pty Ltd Handle
USD649008S1 (en) 2011-02-04 2011-11-22 D & D Group Pty Ltd. Hinge
USD649007S1 (en) 2011-02-04 2011-11-22 D & D Group Pty Ltd Hinge
USD649009S1 (en) 2011-02-07 2011-11-22 D & D Group Pty Ltd Hinge
USD661173S1 (en) 2011-02-04 2012-06-05 D&D Group Pty Ltd. Hinge
USD672631S1 (en) 2011-02-04 2012-12-18 D & D Group Pty Ltd. Striker for latch
USD673024S1 (en) 2011-02-04 2012-12-25 D & D Group Pty Ltd. Hinge
USD675080S1 (en) 2011-02-04 2013-01-29 D & D Group Pty Ltd Handle
US9926729B2 (en) * 2016-01-06 2018-03-27 J & S Company Llc Retractable screen door handle assembly

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992003631A1 (en) * 1990-08-13 1992-03-05 David Doyle A self latching magnetic latching device
CN102794335A (zh) * 2012-08-13 2012-11-28 云南工程建设总承包公司 一种工字钢校直机
EP3299547B1 (de) * 2016-09-23 2020-12-30 ASSA ABLOY Sicherheitstechnik GmbH Verriegelungseinrichtung mit magnetischer riegelaufnahme

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US605170A (en) * 1898-06-07 Latch
US2097232A (en) * 1934-04-09 1937-10-26 Rush S Hartman Door lock
US2696398A (en) * 1951-01-10 1954-12-07 Ralph R Teetor Door latch
US2786702A (en) * 1954-02-23 1957-03-26 Macy O Teetor Magnetic catch
US2970857A (en) * 1957-07-24 1961-02-07 Midwest Mfg Company Magnetic door latch
FR1266060A (fr) * 1960-07-20 1961-07-07 Haushahn Maschinenfabrik C Verrouillage de porte pour portes sans serrure, en particulier pour les portes de cages d'ascenseurs
US3129968A (en) * 1961-03-15 1964-04-21 Percy R Graham Latches and locks

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US605170A (en) * 1898-06-07 Latch
US2097232A (en) * 1934-04-09 1937-10-26 Rush S Hartman Door lock
US2696398A (en) * 1951-01-10 1954-12-07 Ralph R Teetor Door latch
US2786702A (en) * 1954-02-23 1957-03-26 Macy O Teetor Magnetic catch
US2970857A (en) * 1957-07-24 1961-02-07 Midwest Mfg Company Magnetic door latch
FR1266060A (fr) * 1960-07-20 1961-07-07 Haushahn Maschinenfabrik C Verrouillage de porte pour portes sans serrure, en particulier pour les portes de cages d'ascenseurs
US3129968A (en) * 1961-03-15 1964-04-21 Percy R Graham Latches and locks

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4822085A (en) * 1986-12-22 1989-04-18 Texim International Adjustable magnetic door latch system
EP1568836A2 (en) * 2004-02-24 2005-08-31 D & Group Pty Limited A Self-latching magnetic latching device
EP1568836A3 (en) * 2004-02-24 2008-01-23 D & Group Pty Limited A Self-latching magnetic latching device
US20080296915A1 (en) * 2004-02-24 2008-12-04 D & D Group Pty Limited Magnetic latch
CN1661189B (zh) * 2004-02-24 2010-12-15 D&D集团有限公司 自闭锁磁性闭锁机构
US9790708B2 (en) 2004-02-24 2017-10-17 D & D Group Pty. Ltd. Magnetic latch
FR2881166A1 (fr) * 2005-01-21 2006-07-28 Arelec Soc Par Actions Simplif Systeme de verrouillage a liberation par pression ou traction
USD647781S1 (en) 2011-02-04 2011-11-01 D&D Group Pty Ltd Handle
USD647779S1 (en) 2011-02-04 2011-11-01 D & D Group Pty Ltd Hinge
USD649008S1 (en) 2011-02-04 2011-11-22 D & D Group Pty Ltd. Hinge
USD649007S1 (en) 2011-02-04 2011-11-22 D & D Group Pty Ltd Hinge
USD661173S1 (en) 2011-02-04 2012-06-05 D&D Group Pty Ltd. Hinge
USD672631S1 (en) 2011-02-04 2012-12-18 D & D Group Pty Ltd. Striker for latch
USD673024S1 (en) 2011-02-04 2012-12-25 D & D Group Pty Ltd. Hinge
USD675080S1 (en) 2011-02-04 2013-01-29 D & D Group Pty Ltd Handle
USD647782S1 (en) 2011-02-04 2011-11-01 D&D Group Pty Ltd Latch
USD649009S1 (en) 2011-02-07 2011-11-22 D & D Group Pty Ltd Hinge
US9926729B2 (en) * 2016-01-06 2018-03-27 J & S Company Llc Retractable screen door handle assembly

Also Published As

Publication number Publication date
DE1553415A1 (de) 1969-10-16
BE667471A (es) 1900-01-01
NL6408628A (es) 1966-01-31
ES315864A1 (es) 1966-03-16
GB1108996A (en) 1968-04-10

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