US2809062A - Latch mechanism - Google Patents

Latch mechanism Download PDF

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Publication number
US2809062A
US2809062A US455700A US45570054A US2809062A US 2809062 A US2809062 A US 2809062A US 455700 A US455700 A US 455700A US 45570054 A US45570054 A US 45570054A US 2809062 A US2809062 A US 2809062A
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Prior art keywords
bolt
door
magnet
sleeve
latch
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Expired - Lifetime
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US455700A
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Mainhardt Robert
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Mainhardt Robert
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    • EFIXED CONSTRUCTIONS
    • E05LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05BLOCKS; ACCESSORIES THEREFOR; HANDCUFFS
    • E05B47/00Operating or controlling locks or other fastening devices by electric or magnetic means
    • E05B47/0038Operating or controlling locks or other fastening devices by electric or magnetic means using permanent magnets
    • E05B47/004Operating or controlling locks or other fastening devices by electric or magnetic means using permanent magnets the magnets acting directly on the bolt
    • EFIXED CONSTRUCTIONS
    • E05LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05BLOCKS; ACCESSORIES THEREFOR; HANDCUFFS
    • E05B47/00Operating or controlling locks or other fastening devices by electric or magnetic means
    • E05B2047/0092Operating or controlling locks or other fastening devices by electric or magnetic means including means for preventing manipulation by an external magnetic field, e.g. preventing opening by using a strong magnet
    • 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
    • Y10T292/08Bolts
    • Y10T292/096Sliding
    • Y10T292/1014Operating means
    • Y10T292/1021Motor

Description

Oct. 8, 1957 R. MAINHRDT LATCH MECHANISM Filed Sept. 13, 1954 f Tamil.. ,/5
United States Patent iiice 2,809,062 Patented Oct. 8, 1957 LATCH MECHANISM Robert Mainhardt, Diablo, Calif. Application September 13, 1,954, Serial No. 455,700
1 Claim. (Cl. 292-144) This invention relates to locking or latching elements for releasably securing a movable member, such as a door, Window or drawer, against movement relative to an adjacent frame or support member, and is more particularly directed towards a novel arrangement for selectively placing the lock element in its operative and inoperative positions.
It is an object of the present invention lto provide a latching mechanism for doors, windows, drawers or the like in which an internal bolt element may be axially moved to either a locking position or a released position from exteriorly of the structure Without requiring any mechanical operation such as knob or key rotation, and without necessitating any complicated installation for the mechanism.
Another object of my invention is to provide a lock arrangement of the character described in which a magnetic force is utilized for effecting movement of the latch or bolt in which the presence of the lock is completely unapparent from other side of the door.
A further object of this invention is to provide apparatus as above describedjin which means may be incorporated so that the aforementioned axial bolt movement may be affected from only one side of the structure, thereby permitting the use of such apparatus on windows or the like Without danger of unauthorized opening from the outside of the structure.
A still further object of this invention is to provide a mechanism as hereinabove characterized which may be readily placed on cabinets, windows, doors, drawers, etc. to prevent children or other persons from opening the particular structure, with all of such installations being operable by a single magnet capable of attracting the ferreus bolt, or by a bar of ferrous metal capable of actuating a magnetic bolt.
The invention possesses other objects and features of advantage, some of which, with the foregoing, will be set forth in the following description of the preferred form of the invention which is illustrated in the drawing accompanying and forming part of the specification. It is to be understood, however, that variations in the showing made by the said drawing and description may be adopted within the scope of the invention as set forth in the claim.
Referring to said drawing:
Figure l is a cross-sectional View of a portion of a door and frame structure equipped with the latch of the present invention, the latch being illustrated in its open or inoperative position.
Figure 2 is a view similar to Figure 1, but showing the latch in its closed or operative position.
Figure 3 is a cross-sectional View of a modified form of the invention.
Figure 4 is a perspective view of a bracket shown in Figure 3.
Figure 5 is a view similar to Figure 1, illustrating another form of lock arrangement.
Figure 6 is a cross-sectional view of still another form of the invention.
Figure 7 is a cross sectional view of a further form of the invention.
Before discussing the details of construction and operation of the present mechanism, it will be noted that the drawing, for reasons of simplicity, shows the same in connection with a door and adjacent frame structure. However, it will be apparent that the same arrangement is equally effective on windows, drawers or other structures wherein a movable member is to be releasably secured to a relatively stationary member.
Referring rst to the embodiment of the invention shown in Figures l and 2 of the drawing, a portion of a .door 12 is shown in its closed position relative to a stationary frame or jamb portion 13, and as will be understood, the door is movable about hinges or the like as suggested by the arrow in Figure l. In order to maintain the door in its closed position, the lock mechanism of the present invention is utilized. As here illustrated, such mechanism will be seen to include a bolt member 14, preferably of elongated cylindrical form, which is axially slidable in a sleeve 16 mounted in a bore 17 of the door. The sleeve is suliiciently long to receive the entire length of the bolt so that the bolt may assume the inoperative position illustrated in Figure 1 wherein 'the door is free to move relative to its frame. In order to lock the door, the frame or jamb is provided with a f bore 18 of Va larger diameter than but axially aligned with bore 17 when the door is shut. A sleeve 19 is mounted in bore 18 and as illustrated in Figure 2, when the bolt is moved to the left, a portion thereof will enter sleeve 19 and eectively prevent relative movement between the members 12 and 13.
VWhile the foregoing construction is not particularly novel, the manner ofV effecting the axial bolt movement constitutes an important feature 'of my invention. In accordance with this invention, I have completely eliminated the need for knobs, keys, and associated mechanisms, and control the bolt movement by magnetic forces. More particularly, the bolt elementy 14 is constructed of a ferromagnetic material such as iron, steel, nickel or cobalt, with the sleeves 16 and 19, as well as the members 12 and 13 being constructed of a paramagnetic material. By way of example, if the members 12 and 13 are formed of wood, the sleeves may be formed of brass, copper, plastic material or other metals which exhibit virtually no properties of attraction, repulsion or magnetization when placed near a magnet or in a magnetic field. Thus, with the foregoing in mind, it will be apparent that by moving a magnet 21 along the axes of the sleeves adjacent the outer faces 22 and 23 of the jamb and door, the bolt will be correspondingly moved to selectively lock and release the door. By using a relatively strong permanent magnet, such as alnico, permalloy or hipernik, I have found that the bolt may be readily actuated through approximately one-half inch of paramagnetic material such as wood, plastic, etc.
The foregoing type of latch arrangement has been found highly satisfactory where, for example, the front of a ycabinet or bureau is not provided with a locking mechanism or where there would be a disadvantage in having any portions of a lock mechanism Visible from exteriorly of the cabinet. Also a child could be readily restrained from opening a door or drawer where dangerous substances may be contained, and the magnet or unlocking key can be stored in a convenient though inconspicuous place when not being used.
I also -contemplate that the bolt 14 may be constructed of a permanent magnetic material, such as alnico, so that a mere piece of iron or steel could actnate the same. However, a horseshoe type magnet used exteriorly on a steel or iron bolt has been found more effective and positive in action. Also if a horseshoe magnet is used in l an automatic locking is desired upon door closure.
conjunction with a magnetized bolt, it would not be necessary to require linear movement of the magnet. The mere application of the appropriate pole of the magnet to the appropriate pole of the bolt will produce the required movement of the bolt. Likewise, by using a diamagnetic material such as Ycopper for the bolt, there would be a repelling action when approached by a magnet.
Means may be provided for preventingcomplete Withdrawal of the bolt from sleeve 16, such as by using a lug 26 or inwardly struck portion on the sleeve engageable in an axial slot 27 of the bolt. The lug may be screwed cr knocked through the sleeve after insertion of the bolt therein and the entire assembly may then Ybe installed in the bore provided therefor.
In place of sleeve 19 on the door jamb, an angle bracket .31, best illustrated in Figure 4 may be utilized. The bracket has a pair of tlanges 32 and 33, with the latter provided with an axial slot 34, and may be installed as shown in Figure 3 in a notched portion 36 of the jamb with ange 33 directly opposed to bore 17 when the door is closed. Flanges 32 and 33 together with wall 38 of the notch provides a receiving cavity for the bolt and the slot permits ready adjustment of the bracket along the notched portion, it being understood that a wood screw 39 is used to hold the bracket in position. Here again, the bracket would be constructed of a paramagnetic material.
In Figure 5, another modication is illustrated where The construction may be the same as that shown in Figures l or 3, except that a spring 41 is positioned in the door bore to bear against the innermost end of the bolt. Also, the striking end of the bolt would be beveled as shown at 42 to assist the same in readily entering the jamb opening upon door closure. Here again, a magnet is `used to move the bolt against the spring pressure to permit withdrawal thereof from the jamb opening and subsequent opening of the door.
Figure 6 illustrates a still further embodiment, particularly well adapted to permit actuation of the bolt only from one side of a structure. For example, on a window, it would not be desirable to permit magnetic control of the bolt from exteriorly ofthe building. Accordingly, on one side ofthe bolt, I place a strip or piece 46 of iron, steel or other ferromagnetic material. Thus, a magnet positioned adjacent the faces 22 and 23 would actuate the bolt without interference, while the magnet placed adjacent the opposite faces 47 and 48 could exert no magnetic force on the bolt and hence would be ineffectual in moving the same.
In Figure 7, I have illustrated an arrangement particularly suitable for installations where the surfaces 22 and 23 of the frame and door are not in coplanar relationship. In this instance the magnet cannot be moved along the door and frame, and therefore, the bolt 14 is made of magnetic material so that one end thereof, e. g., the north 'pole may be positioned in one member to be selectively inuenced by the north or south pole of a horseshoe magnet. As shown in the drawing the bolt has been moved into locking position by the repelled movement of the bolt when the two north poles were brought into adjacent relationship. By merely rotating the horseshoe magnet through 180 degrees and bringing the south pole into such position, the bolt will be moved to its unlocked position.
It will also be understood that in many instances it may not be desirable to drill holes in the members for receiving the bolts, and in such instances suitable apertured brackets could be utilized on the inner faces of a drawer, door or thelike.
Iclaim: Y
A latch mechanism for mounting in a member having a bore therein extending to an edge of said member, including a sleeve made of paramagnetic material disposed within said bore, a generally cylindrical latch element axially slidable in said sleeve from a first position entirelywithin said sleeve to a second position extending outwardly lof said sleeve and said edge of said member, Vsaid element being formed of a permanent magnetic material and having aV north and south pole for influence by an exteriorly placed magnetic force, and a strip of ferromagnetic material is positioned between a surface of said member and said sleeve whereby actuation of said element may be aiected only by application of a magnetic force on another surface of the member.
References Cited in the le of this patent UNITED STATES PATENTS 537,746 Boyum e Apr. 16, 1895 1,933,736 Ingersoll Nov. 7, 1933 2,153,088 Knell Apr. 4, 1939 2,468,969 Galey c May 3, 1949 FOREIGN PATENTS 145,325 Germany Nov. 25, 1903 981,307 France Jan. 10, 1951
US455700A 1954-09-13 1954-09-13 Latch mechanism Expired - Lifetime US2809062A (en)

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Cited By (38)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2928272A (en) * 1955-11-07 1960-03-15 Sr Edwin V Statia Lock
US3069193A (en) * 1960-04-12 1962-12-18 Gen Motors Corp Magnetically operated door latch
US3078704A (en) * 1959-06-24 1963-02-26 Rifkin Michael Window latching device
US3642315A (en) * 1970-05-27 1972-02-15 Alan Alpern Magnetic window lock
US3665737A (en) * 1970-08-05 1972-05-30 Starling L Reese Burglar proof method and means
JPS4846010U (en) * 1971-09-29 1973-06-16
JPS4846011U (en) * 1971-09-30 1973-06-16
US3744833A (en) * 1970-04-15 1973-07-10 D Berducone Magnetic latch
JPS4891014U (en) * 1972-02-05 1973-11-01
JPS48110314U (en) * 1972-03-23 1973-12-19
JPS4979595U (en) * 1972-11-01 1974-07-10
JPS5038999B1 (en) * 1969-09-02 1975-12-13
US4343500A (en) * 1980-05-21 1982-08-10 Thunderbolt Corporation Floor imbedded door bolt
EP0211088A1 (en) * 1985-07-20 1987-02-25 Rolf Felskowsky Display frame for flat articles
US4790582A (en) * 1986-10-02 1988-12-13 Edward Keast Concealed window lock
US20030053855A1 (en) * 1998-02-24 2003-03-20 Franz Baur Magnetic drive device for a releasable connection
EP1431239A1 (en) * 2002-12-16 2004-06-23 Wolfgang Jobmann Gmbh Locking device for the lid of a beverage dispenser
US20060049629A1 (en) * 2004-08-17 2006-03-09 Veritas Ag Coupling unit with magnetic latching
GB2421274A (en) * 2004-12-18 2006-06-21 Giovanni Maria Laporta Sash locking system with magnetic key release
WO2006064260A1 (en) * 2004-12-18 2006-06-22 Giovanni Maria Laporta Sash locking system
US7140489B2 (en) 2003-03-26 2006-11-28 Autronic Plastics, Inc. Denial system for securing an asset within a container and methods of use
US7257971B2 (en) 2000-07-31 2007-08-21 Autronics Plastics Inc. Case with internal lock
DE102006020949A1 (en) * 2006-05-05 2007-11-08 Kretzschmar Engineering Limited Connecting device with a locking element
US20080258479A1 (en) * 2004-12-07 2008-10-23 Sensomatic Electronics Corporation Magnetically Actuable Locking Mechanism And Associated Security Device
CN100590287C (en) * 2007-04-30 2010-02-17 庄子平 Door and window lockset
US20100084875A1 (en) * 2008-10-05 2010-04-08 Interlock Usa, Inc. Magnetic lock for windows
FR2952957A1 (en) * 2009-11-23 2011-05-27 Applic Electro Mecaniques Saam Sa D Trap door locking device for street furniture in public path, has bolt returned to unlocking position under effect of external traction electromagnetic force, where component of force is greater than effort exerted by elastic return unit
US8054194B2 (en) 2003-02-10 2011-11-08 Autronic Plastics, Inc. System and method for verifying a security status of a lockable container
DE10106870B4 (en) * 2000-03-10 2013-01-03 Husqvarna Ab Device in a portable motorized tool
US20130321990A1 (en) * 2012-06-01 2013-12-05 Fih (Hong Kong) Limited Latching assembly and electronic device using the same
US20140084762A1 (en) * 2012-09-25 2014-03-27 Inventec Corporation Electronic device and fastening apparatus thereof
US20140091686A1 (en) * 2012-10-02 2014-04-03 Research In Motion Limited Magnetic fastener apparatus and related methods
US20150035417A1 (en) * 2013-08-02 2015-02-05 Htc Corporation Fastening assembly, housing, and disassembling method of housing
US20170335604A1 (en) * 2016-05-19 2017-11-23 Guangzhou Prodigy Daily-Production Co., Ltd Magnetic lock
US9975058B2 (en) 2006-02-20 2018-05-22 Spin Master Ltd. Transformable toy
US20180195771A1 (en) * 2017-01-09 2018-07-12 David Lynn Arrays with Panels Having Magnetically-Controlled Connectors for Attachment to a Support Member
WO2018183554A1 (en) * 2017-03-31 2018-10-04 Kidzlock LLC Magnetic child safety lock
US10407944B2 (en) * 2016-06-03 2019-09-10 Geerpres, Inc. Magnetic lock and utility carts including same

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE145325C (en) *
US537746A (en) * 1895-04-16 Latch
US1933736A (en) * 1931-04-16 1933-11-07 Ingersoll Magnetic Lock Compan Electromagnetic lock
US2153088A (en) * 1936-03-24 1939-04-04 All Steel Equip Company Inc Electric locker control
US2468969A (en) * 1947-07-14 1949-05-03 James O Galey Magnetic doorstop
FR981307A (en) * 1948-12-28 1951-05-24 Locking system, in particular for doors, covers and the like

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE145325C (en) *
US537746A (en) * 1895-04-16 Latch
US1933736A (en) * 1931-04-16 1933-11-07 Ingersoll Magnetic Lock Compan Electromagnetic lock
US2153088A (en) * 1936-03-24 1939-04-04 All Steel Equip Company Inc Electric locker control
US2468969A (en) * 1947-07-14 1949-05-03 James O Galey Magnetic doorstop
FR981307A (en) * 1948-12-28 1951-05-24 Locking system, in particular for doors, covers and the like

Cited By (52)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2928272A (en) * 1955-11-07 1960-03-15 Sr Edwin V Statia Lock
US3078704A (en) * 1959-06-24 1963-02-26 Rifkin Michael Window latching device
US3069193A (en) * 1960-04-12 1962-12-18 Gen Motors Corp Magnetically operated door latch
JPS5038999B1 (en) * 1969-09-02 1975-12-13
US3744833A (en) * 1970-04-15 1973-07-10 D Berducone Magnetic latch
US3642315A (en) * 1970-05-27 1972-02-15 Alan Alpern Magnetic window lock
US3665737A (en) * 1970-08-05 1972-05-30 Starling L Reese Burglar proof method and means
JPS4846010U (en) * 1971-09-29 1973-06-16
JPS4846011U (en) * 1971-09-30 1973-06-16
JPS4891014U (en) * 1972-02-05 1973-11-01
JPS48110314U (en) * 1972-03-23 1973-12-19
JPS4979595U (en) * 1972-11-01 1974-07-10
US4343500A (en) * 1980-05-21 1982-08-10 Thunderbolt Corporation Floor imbedded door bolt
EP0211088A1 (en) * 1985-07-20 1987-02-25 Rolf Felskowsky Display frame for flat articles
US4790582A (en) * 1986-10-02 1988-12-13 Edward Keast Concealed window lock
US20030053855A1 (en) * 1998-02-24 2003-03-20 Franz Baur Magnetic drive device for a releasable connection
US6765330B2 (en) * 1998-02-24 2004-07-20 Franz Baur Magnetic drive device for a releasable connection
DE10106870B4 (en) * 2000-03-10 2013-01-03 Husqvarna Ab Device in a portable motorized tool
US7257971B2 (en) 2000-07-31 2007-08-21 Autronics Plastics Inc. Case with internal lock
US7260962B2 (en) 2000-07-31 2007-08-28 Autronics Plastics Inc. Case with internal lock
WO2004054920A1 (en) * 2002-12-16 2004-07-01 Wolfgang Jobmann Gmbh Blocking device for a beverage dispenser
EP1431239A1 (en) * 2002-12-16 2004-06-23 Wolfgang Jobmann Gmbh Locking device for the lid of a beverage dispenser
US7717298B2 (en) 2002-12-16 2010-05-18 Wolfgang Jobmann Gmbh Blocking device for a beverage dispenser
US8054194B2 (en) 2003-02-10 2011-11-08 Autronic Plastics, Inc. System and method for verifying a security status of a lockable container
US7140489B2 (en) 2003-03-26 2006-11-28 Autronic Plastics, Inc. Denial system for securing an asset within a container and methods of use
US20060049629A1 (en) * 2004-08-17 2006-03-09 Veritas Ag Coupling unit with magnetic latching
US20080258479A1 (en) * 2004-12-07 2008-10-23 Sensomatic Electronics Corporation Magnetically Actuable Locking Mechanism And Associated Security Device
WO2006064260A1 (en) * 2004-12-18 2006-06-22 Giovanni Maria Laporta Sash locking system
GB2421274B (en) * 2004-12-18 2009-08-19 Giovanni Maria Laporta Sash locking system
US20090241609A1 (en) * 2004-12-18 2009-10-01 Giovanni Maria Laporta Sash locking system
GB2421274A (en) * 2004-12-18 2006-06-21 Giovanni Maria Laporta Sash locking system with magnetic key release
US9975058B2 (en) 2006-02-20 2018-05-22 Spin Master Ltd. Transformable toy
US10987604B2 (en) 2006-02-20 2021-04-27 Spin Master Ltd. Transformable toy
DE102006020949A1 (en) * 2006-05-05 2007-11-08 Kretzschmar Engineering Limited Connecting device with a locking element
CN100590287C (en) * 2007-04-30 2010-02-17 庄子平 Door and window lockset
US20100084875A1 (en) * 2008-10-05 2010-04-08 Interlock Usa, Inc. Magnetic lock for windows
FR2952957A1 (en) * 2009-11-23 2011-05-27 Applic Electro Mecaniques Saam Sa D Trap door locking device for street furniture in public path, has bolt returned to unlocking position under effect of external traction electromagnetic force, where component of force is greater than effort exerted by elastic return unit
US20130321990A1 (en) * 2012-06-01 2013-12-05 Fih (Hong Kong) Limited Latching assembly and electronic device using the same
US20140084762A1 (en) * 2012-09-25 2014-03-27 Inventec Corporation Electronic device and fastening apparatus thereof
US20140091686A1 (en) * 2012-10-02 2014-04-03 Research In Motion Limited Magnetic fastener apparatus and related methods
US20150035417A1 (en) * 2013-08-02 2015-02-05 Htc Corporation Fastening assembly, housing, and disassembling method of housing
US9471095B2 (en) * 2013-08-02 2016-10-18 Htc Corporation Fastening assembly, housing, and disassembling method of housing
CN104349629A (en) * 2013-08-02 2015-02-11 宏达国际电子股份有限公司 Housing and disassembling method of housing
CN104349629B (en) * 2013-08-02 2017-07-21 宏达国际电子股份有限公司 Housing and housing method for dismounting
US20170335604A1 (en) * 2016-05-19 2017-11-23 Guangzhou Prodigy Daily-Production Co., Ltd Magnetic lock
US10407944B2 (en) * 2016-06-03 2019-09-10 Geerpres, Inc. Magnetic lock and utility carts including same
US20180195771A1 (en) * 2017-01-09 2018-07-12 David Lynn Arrays with Panels Having Magnetically-Controlled Connectors for Attachment to a Support Member
CN110536993A (en) * 2017-03-31 2019-12-03 儿童锁有限公司 Magnetic force child safety lock
GB2574771A (en) * 2017-03-31 2019-12-18 Kidzlock LLC Magnetic child safety lock
US10533346B2 (en) 2017-03-31 2020-01-14 Kidzlock LLC Magnetic child safety lock
CN110536993B (en) * 2017-03-31 2021-06-11 儿童锁有限公司 Magnetic child safety lock
WO2018183554A1 (en) * 2017-03-31 2018-10-04 Kidzlock LLC Magnetic child safety lock

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