US2901278A - Magnetic latch assembly - Google Patents

Magnetic latch assembly Download PDF

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Publication number
US2901278A
US2901278A US666190A US66619057A US2901278A US 2901278 A US2901278 A US 2901278A US 666190 A US666190 A US 666190A US 66619057 A US66619057 A US 66619057A US 2901278 A US2901278 A US 2901278A
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United States
Prior art keywords
pole piece
magnet
aperture
holder
magnetic latch
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Expired - Lifetime
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US666190A
Inventor
Robinson Preston
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US Philips Corp
North American Philips Co Inc
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US Philips Corp
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Publication date
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Priority to US666190A priority Critical patent/US2901278A/en
Application granted granted Critical
Publication of US2901278A publication Critical patent/US2901278A/en
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    • EFIXED CONSTRUCTIONS
    • E05LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05CBOLTS OR FASTENING DEVICES FOR WINGS, SPECIALLY FOR DOORS OR WINDOWS
    • E05C19/00Other devices specially designed for securing wings, e.g. with suction cups
    • E05C19/16Devices holding the wing by magnetic or electromagnetic attraction
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T24/00Buckles, buttons, clasps, etc.
    • Y10T24/32Buckles, buttons, clasps, etc. having magnetic fastener
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T292/00Closure fasteners
    • Y10T292/11Magnetic

Description

5, 1959 P. ROBINSON 2,901,278

MAGNETIC LATCH ASSEMBLY Filed June 17, 1957 Fig. l

26 Fig. 3

INVENTOR. PRESTON ROBINSON AGENT) United States Patent MAGNETIC LATCH ASSEMBLY Preston Robinson, Williamstown, Mass., assignor to North American Philips Company, Inc., New York, N.Y., a corporation of Delaware This invention relates to a magnetic latch assembly and more particularly to a magnetic latch device for doors and other similar applications.

An object of the present invention is to provide a relatively simple magnetic latch assembly which provides a greater distance of useful attractive force than heretofore known.

Another object of the present invention is to provide a latch construction which can be closed and opened with a minimum of effort and which, when closed, securely maintains the door in a latched condition.

The above and other features, objects and advantages of the present invention will be fully understood from the following description considered in connection with the accompanying illustrative drawings.

Fig. 1 is a partial section and a partial side elevation view of the magnetic latch device embodying my invention in an open position and,

Fig. 2 is a partial section and a partial side elevation view thereof in a closed position,

Fig. 3 is a section view of the latch device as applied to a door.

Referring more particularly to the drawings, the magnetic latch device embodying my invention comprises a pole piece 2 which may be attached to a door jamb 4. A magnet 6 is mounted on the pole piece 2. The magnet 6 is provided with a preferably cylindrical aperture 8 which extends completely through the magnet.

An elongated holder 10 is pivoted at one end thereof at 12. Such holder 10 is provided with a portion 11 constituting :a pole piece. At the other end of the holder 10, there is provided an aperture 14 in which a preferably cylindrical pole piece 16 is positioned with a sliding fit. In this regard, the air gap between the pole piece 16 and the pole piece 11 is relatively small. In the posi tion of the device shown in Fig. 1 a leaf spring 18 holds pole piece 16 in its projected or forward position. Rivets 20 fix one end of spring 18 to the holder 10. Pole piece 16 is provided with a shoulder portion 22 and an end portion 24 shaped correspondingly to the aperture 8 of magnet 6. The pole piece 16 may be made of a good magnetic material such as soft iron, while the pole pieces 2 and 11 may be made out of cold rolled steel.

Fig. 3 discloses the latch device in accordance with the present invention as applied to a door. In this instance, the door jamb 4 has the magnet 6 and pole piece 2 mounted therein which function as a strike plate. Pole piece 16 acts as the bolt of the device and is mounted in door 26 having a handle 28.

The operation of my device is as follows: The loose pole piece 16 is held in its forward or projected position by spring 18 when the magnetic latch device is open as seen in Fig. 1. However, as the pole piece 16 is moved toward pole piece 2 the gap G is narrowed. Pole piece 16 then commences to enter the corresponding shaped aperture 8 in magnet 6. The gap G therefore narrows and pole piece 16 becomes attracted by magnet 6 and, is drawn to a seating position on the pole piece 2 secured 2,901,278 Patented Aug. 25, 1959 ice to, for example, a door jamb. The holder 10, therefore, in that instant of time occupies the position shown in broken lines in Fig. 2 and the shoulder 22 immediately thereafter forces the spring 18 in an upwards direction. Thus, since the gap G1 is within the influence of the magnet 6, pole piece 11 is attracted to the magnet against the resistance of spring 18 until pole piece 11 is seated on magnet 6 as shownin full lines in Fig. 2. It should be noted that in the present construction a useful attractive force over the distance (d) is achievedwThe distance is much greater than would be the case if the aforesaid parts were rigidly assembled in accordance with known practice.

While I have shown and described the preferred embodiment of my invention, it will be understood that the latter may be embodied otherwise than as herein specifically illustrated or described and that in the illustrated embodiment certain changes in the details of construction and in the arrangement of parts may be made without departing from the underlying idea or principle oi the invention within the scope of the appended claims.

What is claimed is:

1. A magnetic latch assembly comprising a support, a first pole piece, means securing said first pole piece to said support, an apertured magnet mounted on said first pole piece with at least a portion of said first pole piece forming a seat closing one end of said aperture, a holder mounted for independent limited movement to and from said apertured magnet, a part of said holder being a second pole piece with an aperture therein, a third pole piece having a face portion shaped complementary to said magnet aperture, said third pole piece having a sliding fit in the aperture of said second pole piece whereby when said holder is moved toward said magnet said third pole piece is drawn by magnetic force into said magnet aperture and seated on the seat of said first pole piece and said second pole piece is drawn into engagement with said magnet.

2. A magnetic latch assembly comprising a support, a first pole piece, means securing said first pole piece to said support, an apertured magnet mounted on said first pole piece with at least a portion of said first pole piece forming a seat closing one end of said aperture, a holder mounted for independent limited movement to and from said apertured magnet, a part of said holder being a second pole piece with an aperture therein, a third pole piece having a face portion shaped complementary to said mag net aperture, said third pole piece having a sliding fit in the aperture of said second pole piece, a spring normally biasing said third pole piece toward said first pole piece whereby when said holder is moved toward said magnet said third pole piece is drawn by magnetic force into said magnet aperture and seated on the seat of said first pole piece and said second pole piece is drawn into engagement with said magnet.

3. A magnetic latch assembly comprising a support, a first pole piece, means securing said first pole piece to said support, an apertured magnet mounted on said first pole piece with at least a portion of said first pole piece forming a seat closing one end of said aperture, a holder mounted for independent limited movement to and from said apertured magnet, a part of said holder being a second pole piece with an aperture therein, a third pole piece having a face portion shaped complementary to said magnet aperture, means including a leaf spring for maintaining said third pole piece with a sliding fit in the aperture of said holder whereby when said holder is moved toward said magnet said third pole piece is drawn by magnetic force into said magnet aperture and seated on the seat of said first pole piece and. said second pole piece is drawn into engagement with said magnet.

4. A magnetic latch assembly comprising a door jamb,

3 a first pole piece, means securing said first pole piece to said door jamb, an apertured magnet mounted on said first pole piece with at leastfa portion of said first pole piece forming a seat closing one end of said aperture,

magnet While the same slides over the third pole piece.

5. A magnetic latch assembly as claimed in claim 4 wherein one of said pole pieces is constituted of soft iron and the other of said pole pieces are constituted of cold a-hol'der on a door having'a second pole piece with an 5 rolled steel.

aperture therein, a, third pole piece having'a face portion shaped complementary to said magnetapertnre, said third pole piece haying a slidin fit in the aperture of said holder whereby [when said door .and said holder are moved towardsaid magnet said. third pole piece isdrawn bYhaagheticforce into. said magnet aperture to thereby seat on said first tpolewpiece said apertured second pole piece beingthereafter drawn-into engagement with said References Cited in the file of this patent UNITED. STATES PATENTS 2,288,688 Dubilier July 7, 1942 2,812,203 Scholten Nov. 5, 1957 FOREIGN PATENTS 696,676 .France Oct. .20, 1930

US666190A 1957-06-17 1957-06-17 Magnetic latch assembly Expired - Lifetime US2901278A (en)

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Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3196548A (en) * 1963-02-04 1965-07-27 Harold C Moore Measuring device
US4021891A (en) * 1974-04-18 1977-05-10 Application Art Laboratories Co., Ltd. Magnetic lock closure
FR2397050A1 (en) * 1977-07-04 1979-02-02 Applic Art Lab Co Magnetic locking device
US4184277A (en) * 1976-07-23 1980-01-22 Emboss-O-Prestige LTEE Lockable name plate
US4384375A (en) * 1981-02-27 1983-05-24 Jacques Gerome Means for rapidly fixing seat to water closet bowl
US4458395A (en) * 1981-05-18 1984-07-10 Yoshihiro Aoki Magnet clasp
US4458396A (en) * 1981-05-18 1984-07-10 Yoshihiro Aoki Magnet clasp
US4505007A (en) * 1979-10-24 1985-03-19 Yoshihiro Aoki Magnet clasp
US4779314A (en) * 1986-07-24 1988-10-25 Application Art Laboratories Co., Ltd. Magnetic fastener
US4941235A (en) * 1988-10-14 1990-07-17 Application Art Laboratories Co., Ltd. Magnetic lock closure device
US4989299A (en) * 1988-11-15 1991-02-05 Tamao Morita Fastener means utilizing attraction of permanent magnet
US4991270A (en) * 1988-01-27 1991-02-12 Application Art Laboratories Co., Ltd. Magnetic lock closure
US5008984A (en) * 1990-06-12 1991-04-23 Davida Levy Magnetic jewelry closure with clip
US5092019A (en) * 1990-06-12 1992-03-03 Davida Levy Magnetic jewelry closures with safety features
US5125134A (en) * 1985-12-27 1992-06-30 Tamao Morita Magnetic fastener
US5197168A (en) * 1990-06-12 1993-03-30 Davida Levy Magnetic jewelry closures with wire safety clasp
US5317789A (en) * 1990-06-12 1994-06-07 Davida Levy Magnetic jewelry closures with safety features
US5630258A (en) * 1995-08-07 1997-05-20 Schneider; John R. Magnetic buckle
US5707091A (en) * 1996-06-05 1998-01-13 Tarmo Company, Limited Fastener
US20110191988A1 (en) * 2008-10-08 2011-08-11 The Dual Magnetic Interlocking Pin System, Llc Kits for quick attaching and disconnecting an item
US10036185B2 (en) * 2013-07-29 2018-07-31 Cavity Sliders Limited Latch arrangement

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR696676A (en) * 1930-06-05 1931-01-06 An automatic locking motor vehicles hoods and doors
US2288688A (en) * 1939-08-05 1942-07-07 Dubilier William Magnetic lock
US2812203A (en) * 1956-05-21 1957-11-05 Indiana Steel Products Co Permanent magnet holding arrangement

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR696676A (en) * 1930-06-05 1931-01-06 An automatic locking motor vehicles hoods and doors
US2288688A (en) * 1939-08-05 1942-07-07 Dubilier William Magnetic lock
US2812203A (en) * 1956-05-21 1957-11-05 Indiana Steel Products Co Permanent magnet holding arrangement

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3196548A (en) * 1963-02-04 1965-07-27 Harold C Moore Measuring device
US4021891A (en) * 1974-04-18 1977-05-10 Application Art Laboratories Co., Ltd. Magnetic lock closure
US4184277A (en) * 1976-07-23 1980-01-22 Emboss-O-Prestige LTEE Lockable name plate
FR2397050A1 (en) * 1977-07-04 1979-02-02 Applic Art Lab Co Magnetic locking device
US4505007A (en) * 1979-10-24 1985-03-19 Yoshihiro Aoki Magnet clasp
US4384375A (en) * 1981-02-27 1983-05-24 Jacques Gerome Means for rapidly fixing seat to water closet bowl
US4458395A (en) * 1981-05-18 1984-07-10 Yoshihiro Aoki Magnet clasp
US4458396A (en) * 1981-05-18 1984-07-10 Yoshihiro Aoki Magnet clasp
US5125134A (en) * 1985-12-27 1992-06-30 Tamao Morita Magnetic fastener
US4779314A (en) * 1986-07-24 1988-10-25 Application Art Laboratories Co., Ltd. Magnetic fastener
US4991270A (en) * 1988-01-27 1991-02-12 Application Art Laboratories Co., Ltd. Magnetic lock closure
US4941235A (en) * 1988-10-14 1990-07-17 Application Art Laboratories Co., Ltd. Magnetic lock closure device
US4989299A (en) * 1988-11-15 1991-02-05 Tamao Morita Fastener means utilizing attraction of permanent magnet
US5197168A (en) * 1990-06-12 1993-03-30 Davida Levy Magnetic jewelry closures with wire safety clasp
US5092019A (en) * 1990-06-12 1992-03-03 Davida Levy Magnetic jewelry closures with safety features
WO1991019432A1 (en) * 1990-06-12 1991-12-26 Davida Levy Magnetic jewelry closure with clip
US5317789A (en) * 1990-06-12 1994-06-07 Davida Levy Magnetic jewelry closures with safety features
US5008984A (en) * 1990-06-12 1991-04-23 Davida Levy Magnetic jewelry closure with clip
WO1992018028A1 (en) * 1991-04-19 1992-10-29 Davida Levy Magnetic jewelry closures with safety features
US5630258A (en) * 1995-08-07 1997-05-20 Schneider; John R. Magnetic buckle
US5707091A (en) * 1996-06-05 1998-01-13 Tarmo Company, Limited Fastener
US20110191988A1 (en) * 2008-10-08 2011-08-11 The Dual Magnetic Interlocking Pin System, Llc Kits for quick attaching and disconnecting an item
US8776327B2 (en) * 2008-10-08 2014-07-15 The Dual Magnetic Interlocking Pin System, Llc Kits for quick attaching and disconnecting an item
US10036185B2 (en) * 2013-07-29 2018-07-31 Cavity Sliders Limited Latch arrangement

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