US3420562A - Magnet holder for door closures and the like - Google Patents

Magnet holder for door closures and the like Download PDF

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Publication number
US3420562A
US3420562A US3420562DA US3420562A US 3420562 A US3420562 A US 3420562A US 3420562D A US3420562D A US 3420562DA US 3420562 A US3420562 A US 3420562A
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United States
Prior art keywords
abutment
magnet
housing
magnet holder
plate
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Expired - Lifetime
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English (en)
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Peter Simon
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Individual
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Individual
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    • 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
    • Y10T292/11—Magnetic

Definitions

  • Ec 17/56; E05c I9/16 ABSTRACT OF THE DISCLOSURE Magnet holder for door closures and the like which comprises in combination a housing; a magnet assembly disposed in said housing; an armature plate forming part of said magnet assembly; at least one pole piece arranged for contacting said armature plate under the action of the coersive power of the magnet; an abutment plate for bracing the magnet during its action, the said abutment plate being deflectably disposed in said housing opposite said armature plate so as to permit the Ibase line of the abutment plate to shift in a plane about parallel to the direction of the coersive action of the magnet; abutment surfaces provided on said abutment plate, at least one of said abutment surfaces thus being adapted, upon deflection of said abutment plate, for limited movement relative to said housing; and stop means on said magnet assembly for cooperating with said abutment surfaces.
  • the magnet system in this type of magnet holder consisting of two parallel pole pieces and a permanent magnet arranged between the pole pieces is usually disposed in a housing which is penetrated at its frontal wall partly 'by the pole pieces.
  • the pole pieces have stops at opposite sides which abut in a close t the inside yface of the stationary and rigid frontal wall of the housing.
  • the magnet system therefore cannot move and the pole pieces can come into full contact with the armature plate only if the armature plate is exactly parallel to the Contact faces of the pole pieces.
  • Such alignment usually is not accomplished since door and door frame are apt to get warped.
  • a mounting true to the angle involved of the magnet holder and of the armature plate at the furniture parts is usually not possible.
  • the invention has also the object to iform a magnet holder of the type indicated which consist-s only of comparatively few parts and can easily be assembled without special tools.
  • a magnet holder comprising, in combination a housing; a magnet assembly disposed in said housing; an armature plate forming part of said magnet assembly; at least one pole piece arranged for contacting said armature plate under the action of the coersive power of the magnet; an abutment member for bracing the magnet during its action, the said abutment memlber being deectably disposed in said housing opposite said armature plate so as to permit the base line of the abutment member to shift in a plane about parallel to the direction of the coercive action of the magnet; abutment surfaces provided on said abutment member, at least one of said abutment surfaces thus being adapted, upon deection of Isaid abutment member, for limited movement relative to said housing; and stop means on said magnet assembly for cooperating with said abutment surfaces.
  • FIG. 1 is a part, diagrammatic view of a furniture door and the magnet holder shown in closing position by way of one embodiment of the invention
  • FIG. 2 is a front view of the magnet holder of FIG. l;
  • FIG. 3 is a cross section through the magnet holder of FIG. 2 along lines 3 3;
  • FIG. 4 is a cross section through the magnet holder of FIG. 2 along lines 4--4;
  • FIG. 5 is a bottom view of the housing of the magnet holder shown in FIG. 2 after removal of the magnet assembly from the housing;
  • FIG. 6 is an exploded perspective view of the magnet assembly of the magnet holder of FIG. 2;
  • FIG. 8 is a Side View of the abutment plate of the magnet holder of FIG. 2, the abutment plate being under the coercive action P of the magnet (not shown);
  • FIG. 9 shows a modication of the front wall of the magnet holder of FIG. 2;
  • FIG. 10 shows another modication of the front wall of the magnet holder of FIG. 2;
  • FIG. 1l is a bottom View of the other embodiment of the magnet holder
  • FIG. 12 is a section through the magnet holder of FIG. 11 along lines 12-12;
  • FIG. 15 is an enlarged perspective view of a detail of the magnet holder of FIGS. l1 to 13.
  • the magnet system preferably comprises a magnet and two plate-like pole pieces, the magnet being held between the pole pieces.
  • the stop places are provided only at the pole pieces while the permanent magnet itself is force-locked between the pole pieces. If the magnet system is formed of one piece or if the pole pieces are rigidly connected to the permanent magnet it is of course possible also to provide for a stop on the permanent magnet itself.
  • the movability of the abutment surfaces provided on the abutment plate can be affected in many different ways. Frequently it is preferable to provide the abutment plate for oscillation in the housing.
  • the journalling of the abutment plate can for instance be carried out by means of spring locks for instance in the form of strips or similar which can be formed for torsion or for bending and can be rigidly connected to a stationary part of the housing and to the abutment plate itself.
  • the locks or strips can also be formed in one piece with the abutment plate and the housing. Their width, length and location must be arranged so that the required mobility of the abutment plate and of the abutment surfaces is effected. It may be advantageous to arrange the lugs by means of a universal joint for the abutment plate. Preferably, in this case there are four lugs which may be aligned in pairs.
  • At least part of the abutment plate is formed with at least one springy abutment surface in order to provide ⁇ for at least some of the required movability.
  • the magnet system in order to obtain a smooth close contact with the armature plate must be adapted for oscillating movements about two pivot axes which are directed at right angles to each other or in other words it must be arranged to have two degrees of pivot movement.
  • the axes should extend about parallel to the front face of the housing. This can be accomplished easily in the magnet holder of the invention. It is not necessary in this case to have pivots as physical parts.
  • pivot axes The disposition of the pivot axes relative to the housing need not be immovable since the definition of the movability of the magnet system by means of the mentioned axes is merely a theoretical assumption. However, all this does of course not exclude that there may lbe physical parts constituting pivots vfor the abutment plate.
  • abutment surface there are two spaced abutment surfaces, one for each of the pole pieces.
  • the abutment surface may be in form of a linear plane surface or it may be in form of two aligned surfaces.
  • abutment base lines it is possible to provide -for a suitable number of abutment surfaces along this line.
  • the magnet system has a limited degree of oscillation about the abutment base line. This will permit a really smooth close fitting with the armature plate when used in connection with the oscillation of the abutment base itself.
  • a particularly preferred form provides for a ribbonlike strip in the front face of the housing preferably in an opening in that front face.
  • at least one abutment surface is provided for the abutment base line.
  • the strip is formed in a manner that the abutment surface can elastically yield to the coercive force exerted by the magnet assembly.
  • the length of the strip preferably is larger than its width and the Strip may be connected rigidly at its narrow sides to the housing or may be fastened thereto.
  • the strip can also be subdivided in several parallel segmental strips in which case each of these segmental strips should have at least one abutment surface. It is preferable for the oscillation of the abutment that the abutment base line is procided in the center of the strip and that it extends parallel to the narrow sides of the strip if there is no force exerted upon the strip.
  • the abutment and its suspension can be formed of any suitable material, preferably of a synthetic material with good elastic properties.
  • a plastic such as an acetal resin made of polymerized anhydrous formaldehyde (polyoxymcthylene) may ⁇ be used for this pul. ⁇ pose.
  • FIG. 1 indicates the door of a ⁇ furniture piece and 11 indicates the door frame.
  • An armature 12 consisting of sheet steel is fastened to the door by means of a screw 13.
  • a magnet holder 14 is likewise fastened to the door frame 11 by means of screws such as indicated at 15.
  • a magnet assembly 21 is provided in the magnet holder 14 comprising pole pieces 16 and 17 which abut with their plane contact surfaces 18 and 19 (FIG. 2) smoothly to the armature plate by virtue of the oscillating arrangement.
  • the magnet holder 14 which has illustrated in greater detail in FIGS. 2 to 8, comprises a lhousing 20 in which the magnet assembly 21 is disposed to permit oscillation thereof.
  • the housing has an inner space 22 and an open floor as well as a ceiling 23, a frontal wall 24, a rear wall 25 and two side walls 26 and 27.
  • the usual shoulders for fastening purposes 28 and 29 are provided on the housing and longitudinal slots 30 are provided through which the holding screws 15 extend.
  • a central rib 3-1 is disposed in the rear wall 25.
  • the magnet in released condition will abut against this central rib 31 and will thus be prevented from dropping out of the housing without causing any difficulties to the successive introduction of the various parts of the magnet assembly during mounting.
  • Two wedge-like projections 32 are provided in the ceiling 23.
  • the protruding portions 33 which are close to the face wall 24 also serve as support plates to the magnet assembly 21 without interfering with its oscillation.
  • the projecting portions 33 are therefore disposed slightly above the upper edge 35 of an opening provided in the frontal wall through which the pole piece 16 of the magnet extends.
  • the frontal wall of the housing has a stationary part and a movable abutment member in the form of an abutment plate 41 which parts both are plane and of equal thickness.
  • Both parts are formed in one piece by means of central ribs 42, 42 which permit oscillation of the abutment 41 that is located in the opening of the frontal wall 24 about an axis 70.
  • the abutment member y41 has two rectangular apertures 36 and 39 for the pole pieces 16 and 17.
  • the abutment member is disposed itself in a rectangular opening of the stationary part ⁇ 40 of the front wall at a small spacing from the circumferential Wall 43 of the aperture.
  • the circumferential walls of the openings 36 and 39 surround the pole pieces 16 and 17 in a substantially close iit and therefore form an additional support for the magnet assembly 21.
  • the magnet system 21 itself comprises a parallelepipedon shaped permanent system and two pole plates 53 and 54 that are force-locked on its plane faces of the magnets 51 and 52.
  • the pole plates can also be rigidly connected to the permanent magnet 50, however the assembly will be easier if they are merely locked by force to the magnet 50.
  • the two pole plates are of even shape and are provided on opposite sides each with two stepped ledges.
  • the ledges are indicated by the reference numbers 55, 55", 55"', 56, 56', S6, and 56 and their purpose will be further discussed below.
  • the pole pieces 16 and 17 themselves form parts of the pole plates 53 and 54.
  • abutment surfaces to 63 are provided in the rear face of the abutment plate 41 next to the apertures 36 and 39 for the pole pieces 16 and 17.
  • the abutment surfaces are part of the abutment plate and form the corner points of a rectangular polygon.
  • the stops provided on the magnet pole plates in the form of stepped ledges 55, 55', 55", and 55" are provided for abutment to the abutment surfaces in response to coercive -action of the magnet.
  • spring tongues 46 and 47 are provided parts of the abutment plates as spring tongues 46 and 47. These are the parts laterally of the oscillation axis 70. These spring tongues are adapted to be bent and twisted out of the frontal plane of the housing under the coercive action P of the magnet. This bending and twisting is in addition to the twisting of the ribs 42 and 42. This enables the oscillation of the base line of the abutment which is formed by the abutment surfaces of the abutment plate as has been explained. This is particularly illustrated in FIGS. 7 and 8.
  • the frontal plane of the housing is indicated as 44. As is shown in FIGS.
  • the ledges 56, 56', 56, and 56" of the pole shoes 53 and 54 are provided in a manner to form abutments which are supported on the inner faces 68 of the stationary part 40 of the frontal wall of the housing if the magnet system 21 protrudes or oscillates to a corresponding degree from the frontal plane. Thus, an overloading of the abutment and its suspension upon opening of the door 10 will be prevented.
  • the magnet system 21 in the FIGS. 2 to 8 rests against the rib 31 only when not in action. As soon as the coercive force is exerted in the direction of the arrow A (FIG. 4) the magnet system will be lifted from the rib 31 (FIG. 4) and can then oscillate practically without friction in the described manner. Thus, the coercive force can have its maximum effect.
  • the magnet holder shown in FIG. 9 corresponds in all details to the described embodiment except that the ribs 42 and 42"' are of greater extent. The same reference numbers are therefore used in this figure.
  • the extension of the ribs beyond that shown in the previous figures has the advantage that in itself this permits an oscillation of the magnet system about its two axes 70 and 71 (FIG. 2) since the ribs act not only as torsion springs but also as leaf springs.
  • the ribs 42" and 42 as well as the tongues 46 and 47 have the effect to provide for a journalling of the magnet system which has two freedoms of oscillation. These two effects are added and each oscillating system is therefore under less strain. In certain cases of course only one of these oscillations or deflections will be suiicient.
  • the desired flexibility of the above abutment member can also be obtained by a universal joint suspension of the abutment as indicated in FIG. 10. This would be the case if for some reason it was desired to form the abutment as a substantially rigid plate.
  • the rigid abutment member 41 of this figure is disposed in a ring 73 which forms part of the frontal wall by means of the central ribs 42a, 42b, thus permitting oscillation around a pivot axis 7 0.
  • the ring 73 in turn is provided for oscillation on the stationary part 40 of the frontal wall 24 of the housing 20 by means of the two central ribs 74 and 74', the oscillation taking place around the pivot axis 71 which is at right angles to the pivot axis 70.
  • the magnet holder of which the abutment surfaces are indicated as 60' to 63 and the pole pieces as 16 and 17 is similar to the previous embodiment and does not require further explanation.
  • the magnet holder which is shown in FIGS. 11 to l5 shows a housing 20' in the form of a parallelepipedon in which the magnet system indicated as 21 is located for oscillation.
  • the housing has a floor 12 in which an opening 34 is provided and which has the frontal wall 24", a rear wall 25', a ceiling 23', and lateral walls 26' and 27.
  • Longitudinal apertures 37 and 38 are provided in the lateral walls to permit the application of screws by which the magnet holder can be fastened on the furniture piece.
  • the magnet holder 21 has a permanent magnet in the form of a parallelepipedon 50 which is made of an oxide-ceramic material and which has pole surfaces 51', 52' provided on the pole plates 53 and 54 madev of soft iron and held by force-fit.
  • Each pole plate has a pole piece 48, 49 and each pole piece has a slotted aperture 66, 67 and is thereby subdivided into two segments 75, 78 of equal form and equal polarity.
  • the bottom of each opening forms a support for a stop 66', 67 for the magnet system in cooperation with the abutment 72 as will be explained further below. Both stops are located in a plane of symmetry of the magnet system which is at right angles to the planes of the pole pieces and pole surfaces 18' and 19'.
  • the width of the pole pieces is substantially greater than the distance between them.
  • the pole pieces protrude through longitudinal slots 79 and 80 provided in the front wall 24 of the housing.
  • the upper longitudinal edge 81 of the slot 79 is formed by an edge of the stationary housing in order to facilitate assembly is flush with the inner face 82 of the ceiling 23.
  • This inner face 82 extends from the longitudinal edge 81 in the direction towards the rear wall 25 of the housing and slants upwardly in order to permit oscillation of the magnet system in direction of the arrow B.
  • the assembly of the magnet holder is affected by rst introducing the pole plate 54 in the housing into the position shown in FIG. 12, then placing upon it the permanent magnet 50 and finally introducing the pole plate 53.
  • a ribbon-like strip 90 extends between the pole plates and is provided with two elastic ribs 90 and 90 and is connected in one piece at its small sides 91 and 92 with the housing. In the center it has two lateral pro truding ends 93 and 94 which extend into apertures 66 and 67 of the pole plates.
  • Semi-circular curved rib-like abutment surfaces 95 and 96 are provided on the rear sides of the protruding projections as shown in FIG. 15. These abutment surfaces 95 and 96 are in alignment and the stops 66 and 67 of the pole plates can be caused to come in Contact with them during the oscillation.
  • the abutment surfaces 95 and 96 are clearly shown in FIG. 15 which is an enlarged part perspective rear view of the abutment 93.
  • These support surfaces define a base line 97 of the abutment Iwhich is adapted to adjust itself in the direction of the arrow F in a slanting way towards the frontal ⁇ wall by means of the torsion effects on strip 90.
  • the projections 93 and 94 have the effect that the base line of the abutment is longer than the width of the strip 90 which is favorable for the operation of the device.
  • the abutment surfaces 95y and 96 are formed as one coherent rib to facilitate the manufacture.
  • the abutment surfaces 95 and 96 of the abutment form oscillating pivots for the magnet system.
  • the magnet system therefore is adapted for limited oscillation in the direction of the double arrow C (FIG. l1) about the base line 97 of the abutment. It can thus adjust itself in a second plane of oscillation which is at right angles to the previously mentioned first plane of oscillation and parallel to the armature plate.
  • an optimum contact or abutment between the magnet system and the armature plate is always effected.
  • Spaces are provided between the inner faces 98 and 99 of the housing in the pole plates which spaces are sufliciently large so that the magnet system can oscillate laterally in the direction of the double arrow C as necessary.
  • a semi-circular curved rib 85 is provided on the rear face 89 of the inside of the housing. This rib is also a pivot for the oscillation of the magnet system which is also favorable for the journalling of the magnet system in the housing and does not in any way interfere Iwith the pivoting about the abutment surfaces 95 and 96.
  • a magnet holder for door closures and the like comprising a housing; a magnet assembly disposed in said housing; an armature plate coacting with said magnet assembly; at least one pole piece arranged for contacting said armature plate under the action of the coercive power of the magnet; an abutment member having at least one base line and bracing the magnet assembly during its action, the said abutment member being deectably disposed in said housing opposite said armature plate so as to permit at least said one base line of the abutment member to shift in at least one plane about parallel to the direction of the coercive action of the magnet; at least one abutment surface provided on said abutment member, the said abutment surface thus being adapted for limited movement relative to said housing upon deliection of said abutment member; and stop means on said magnet assembly for cooperating with said abutment surface.
  • the magnet holder of claim 1 wherein apertures are provided in the front wall of the housing opposite the said armature plate and wherein the magnet assembly includes pole pieces that penetrate -through said apertures ⁇ and wherein a support is provided in the rear wall of the housing to prevent disengagement of the magnet and wherein the bottom of the housing is open.
  • magnet assembly includes pole plates carrying said pole pieces and wherein stop means are provided on the pole plates for cooperation with the abutment surfaces of the abutment member.
  • the magnet holder of claim 9 wherein the abutment member is connected with the housing by means of springy tongue pieces, the ends of the tongue pieces being connected at one end to the abutment member and at the other end to the stationary housing.
  • the magnet holder of claim 1 wherein the magnet assembly includes two pole plates and wherein two stops are provided on each pole plate disposed at the lateral sides of the pole pieces.
  • the magnet holder of claim 1 wherein at least one abutment surface is provided at the ceiling of the housing in proximity to the front wall thereof, the said abutment surface being adapted to support the magnet assembly.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
US3420562D 1966-08-31 1967-08-25 Magnet holder for door closures and the like Expired - Lifetime US3420562A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DES0105614 1966-08-31
DES0109310 1966-08-31

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US3420562A true US3420562A (en) 1969-01-07

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AT (1) AT286817B (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100270817A1 (en) * 2009-04-28 2010-10-28 Hong Fu Jin Precision Industry (Shenzhen) Co., Ltd. Collapsible device
US20100279563A1 (en) * 2009-02-18 2010-11-04 Ian Godfrey Heard Magnetic Fin Attachment System
US20160258200A1 (en) * 2015-03-04 2016-09-08 Bobrick Washroom Equipment, Inc. Partition and closing system for partition
US9470032B2 (en) 2014-06-16 2016-10-18 DoorDots, LLC Door stop device and method

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2770759A (en) * 1955-02-08 1956-11-13 Amerock Corp Magnetic assembly
US2896991A (en) * 1956-07-17 1959-07-28 Magni Power Company Magnetic door holder
FR1366145A (fr) * 1963-05-29 1964-07-10 Loqueteau magnétique
US3294433A (en) * 1964-12-17 1966-12-27 Lawrence Brothers Magnetic holding unit

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2770759A (en) * 1955-02-08 1956-11-13 Amerock Corp Magnetic assembly
US2896991A (en) * 1956-07-17 1959-07-28 Magni Power Company Magnetic door holder
FR1366145A (fr) * 1963-05-29 1964-07-10 Loqueteau magnétique
US3294433A (en) * 1964-12-17 1966-12-27 Lawrence Brothers Magnetic holding unit

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100279563A1 (en) * 2009-02-18 2010-11-04 Ian Godfrey Heard Magnetic Fin Attachment System
US20100270817A1 (en) * 2009-04-28 2010-10-28 Hong Fu Jin Precision Industry (Shenzhen) Co., Ltd. Collapsible device
US9470032B2 (en) 2014-06-16 2016-10-18 DoorDots, LLC Door stop device and method
US20160258200A1 (en) * 2015-03-04 2016-09-08 Bobrick Washroom Equipment, Inc. Partition and closing system for partition
US9879461B2 (en) * 2015-03-04 2018-01-30 Bobrick Washroom Equipment, Inc. Partition and closing system for partition

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AT286817B (de) 1970-12-28

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