EP0049580B1 - Magnetic door catches - Google Patents
Magnetic door catches Download PDFInfo
- Publication number
- EP0049580B1 EP0049580B1 EP19810304312 EP81304312A EP0049580B1 EP 0049580 B1 EP0049580 B1 EP 0049580B1 EP 19810304312 EP19810304312 EP 19810304312 EP 81304312 A EP81304312 A EP 81304312A EP 0049580 B1 EP0049580 B1 EP 0049580B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- door
- catch
- frame
- pole pieces
- members
- 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
Links
Images
Classifications
-
- 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
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C15/00—Details
- F24C15/02—Doors specially adapted for stoves or ranges
- F24C15/022—Latches
Definitions
- This invention relates to magnetic door catches and it relates especially, although not exclusively, to a magnetic door catch for use in an oven.
- DE-U-1995429 and DE-C-1067335 both disclose magnetic door catches which typically comprise two main component parts, a first part, which is mounted to the door itself, and includes a permanent magnet, and a second part mounted to the assembly against which the door fits.
- the second part usually comprises a ferromagnetic striking plate which is disposed to engage the first part when the door is closed and to which it is attracted, thereby effecting the latching action of the catch.
- the first part of the catch is generally resiliently mounted by a spring, for example, so as to urge the first part in a direction towards the second part.
- Such catches tend to wear well, and moreover continue to function despite a displacement of the door from its intended mounted position - as often occurs when a heavy door is used.
- an oven door catch subject in use, to temperature variations at least over the range 20°C to 210°C
- the door catch comprising a first member consisting of a permanent magnet and pole pieces, formed of a magnetically soft material, attached to said permanent magnet, a second member consisting of a striker plate, means for mounting the first member to one of said door and a frame therefor and for mounting said second member to the other of said door and said frame, and first resilient means, effective when said door is closed, to urge said pole pieces into contact with said second member, characterized in that said pole pieces are dimensioned to limit the amount of magnetic flux, originating from said permanent magnet, applied to said second member, when the door is closed, to a level commensurate with an amount of flux which is available from said permanent magnet when subjected to temperatures at the upper end of said range; opening of said door thus requiring application thereto of substantially the same amount of force, irrespective of the temperature within said range to which at least said first and second members are subjected.
- an oven door and frame assembly including one or more door catches as described in the immediately preceding paragraph.
- an oven including an oven door and frame assembly as described in the immediately preceding paragraph.
- the first resilient means is preferably a leaf spring which in use is positioned behind the first member in a housing on the door or frame, the spring being arranged to bear against a rear wall of the housing to allow sliding movement of the first member in the housing.
- the first member may be attached to a door or frame by means of a cover plate which extends over the member but allows at least part of the pole pieces to be exposed to attract the second member.
- the cover plate may be fixed to a housing in which the first member is mounted.
- a second resilient means which, in use, biasses one of the first and second members to permit the door to open from the frame before the first and second members are parted from one another.
- the second resilient means therefore, allows a more controlled latching and unlatching operation since it cuts down the initial force required to open the door, by allowing one of the first and second members to move initially against biassing and relative to its fixing on the door or frame.
- the second resilient means preferably, comprises two helical-coiled compression springs mounted on opposed sides of one of the first and second members on rods lying parallel to the force of attraction between the first and second members, said one of the first and second members being movable with the rods as the springs are compressed.
- a first member in the form of main component part 10 of a magnetic door catch which may be mounted to an oven door, comprises a body in the form of a flat plate 11 made of a permanent magnetic material, such as barium ferrite or strontium ferrite, for example, sandwiched between a pair of flat plates 12 and 13 made of a magnetically soft material such as soft iron or mild steel.
- a permanent magnetic material such as barium ferrite or strontium ferrite
- each plate 12, 13 conveniently has a rectangular notch 14, 15 cut into its outer edge (12', 13') so as to create respective upper and lower spaced projections.
- the outer edges 12', 13' overlap the flat plate 11 to form a gap 16.
- a cover plate 30 is provided, which has four rectangular apertures through which the projections protrude.
- the component part 10 may then be mounted in a convenient manner to a door and the cover plate 30 fitted by suitable means such as screws, so as to lie substantially in the plane of the inwardly facing surface of the door.
- FIG. 3 Part of an oven door chassis is shown at 100 in the left hand portion of the figure and this has an aperture 101 which accommodates a housing 102 in which is slidably mounted the door catch component part 10.
- the housing 102 is screwed to the frame by screws 104 which pass through flanges 102' on the housing but alternatively the housing could be integral with the frame.
- the part 10 is shown in partly cut away form so that one of the plates forming a pole piece (shown at, 12, say, in Figure 1) is shown partially in side view at 201 whilst the other plate (13 say) forming the other polepiece is shown in sectional view at 202.
- first resilient means in the form of leaf spring 204 which is seated against a rear wall 103 of the housing 102.
- the body 11 is slidably in the housing 102.
- Other first resilient means a rubber pad or spring, for example, could alternatively be used.
- the striking plate 20, against which the door 100 is latched, in the right hand portion of the drawing is mounted, in a manner to be described below, into a frame 301 of the oven.
- the graph shown in Figure 4 illustrates the variation with temperature of the force required to open the oven door shown in figure 3, that is the force required to overcome the attraction between the main component parts, 10, 11 of the catch.
- the plates 12, 13 which form the pole pieces of the arrangement had a thickness of 2.7 mm and, as shown in curve (a), the force required to open the door was found to decrease from a maximum of 9 kgm at room temperature, to only about 3 kgm at 200°C (a typically operating temperature of the oven). This variation was quite unacceptable for an operative device since although the door may latch reliably at room temperature, when the oven is turned off, the door is relatively easily opened at the higher temperatures.
- this undesirable variation in the opening force was substantially making by reducing the thickness of the plates, 12 and 13, 1.4 mm; the opening force then remaining substantially constant (at 5 kg) over the range of temperature of 20°C to 210°C. It is also envisaged that the opening force would remain substantially constant for temperatures outside this range.
- the thickness of the plates 12, 13 is 1.4 mm the present invention encompasses the provision of pole pieces having alternative dimensions in which the force of attraction between the first and second members does not substantially vary with temperature.
- the striking plate 11 is not fixedly mounted in the body of the oven but is mounted so as to be capable of executing a small movement relative thereto against the action of second resilient means which acts in a direction opposed to the movement of the door as it opens. This is achieved by mounting on opposed sides of the striking plate 11 two spaced rods 302, 303, which pass through holes in the frame 301 of the oven.
- Each rod 302, 303 has a nut 304, and a helical compression spring S is interposed between each nut and the frame 301 to effect a resilient biasing action.
- This arrangement provides for a controlled opening of the door since when the door is initially opened the striking plate remains in contact with the magnetic part of the catch and moves with the rods 302, 303 against the resistance of the compression springs S only, thereby overcoming the inertia of the door.
- Figure 5 shows and alternative arrangement in which the second resilient means S (which is similar to that shown in the figure) is arranged to bias the component part 10 rather than the striking plate 20.
- the component part 10 moves a small distance out of the door with its housing against the action of helical coiled compression springs (only one of which is shown in the figure) until the force is overcome and the striking plate 20 separates from the part 10.
- a rubber pad 305 is positioned between the striking plate 20 and the door frame 301 to cushion the plate on the frame and reduce sound effects.
- a leaf spring could be used instead of one pad.
- the pad 305 is 2 mm thick.
- the cover plate 30 may be, as in this embodiment, fixed to the housing by crimping the ends of the plate over flanges on the housing, and/or so that the housing is capable of moving with the cover plate relative to the door.
- Figure 6 shows a bifurcated spring clip Z which may be used in conjunction with each rod and helical coiled spring S instead of nuts 304.
- the spring clip Z co-operates with an annular notch cut into the rod (which eliminates the need for the rod to be screw-threaded) to limit the movement of the helical coiled spring along the rod.
- first member is to be mounted to a door and the second to a frame it may be preferred to have an arrangement where the first member is mounted to the frame and second to the door.
- One or more door catches may be provided on the same door and frame assembly.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Electric Ovens (AREA)
Description
- This invention relates to magnetic door catches and it relates especially, although not exclusively, to a magnetic door catch for use in an oven.
- DE-U-1995429 and DE-C-1067335 both disclose magnetic door catches which typically comprise two main component parts, a first part, which is mounted to the door itself, and includes a permanent magnet, and a second part mounted to the assembly against which the door fits. The second part usually comprises a ferromagnetic striking plate which is disposed to engage the first part when the door is closed and to which it is attracted, thereby effecting the latching action of the catch. The first part of the catch is generally resiliently mounted by a spring, for example, so as to urge the first part in a direction towards the second part. Such catches tend to wear well, and moreover continue to function despite a displacement of the door from its intended mounted position - as often occurs when a heavy door is used.
- Whilst magnetic door catches of the above- described kind are particularly convenient when used in such applications as drawers or wardrobes, for example, they tend to be unreliable in relatively high temperature applications (up to 200°C, say) - an oven door, for example. This is due to the strong temperature dependence of the permanent magnet, which, as the temperature rises, results in a decrease in the force which needs to be applied to unlatch the door. Thus, whilst the door may be adequately latched at room temperature, say, it is likely to become quite unsafe at relatively high operating temperatures (200°C, say). The size of the permanent magnet could, perhaps, be increased so that the force necessary to open the door, at the elevated temperatures, is sufficiently high, but this would also tend to increase the force required to open the door at low temperature up to an intolerable and/or unworkable level.
- Moreover, where mechanical catches are used, for example, in ovens, problems in opening and closing the oven door properly tend to arise due to the manufacturing tolerances, differential expansion and hinge wear.
- It is an object of the present invention to provide a door catch suitable for use both at ambient and at relatively high temperatures, and which may be used instead of a mechanical catch where the aforesaid problems are likely to arise.
- According to the invention there is provided an oven door catch subject, in use, to temperature variations at least over the
range 20°C to 210°C, the door catch comprising a first member consisting of a permanent magnet and pole pieces, formed of a magnetically soft material, attached to said permanent magnet, a second member consisting of a striker plate, means for mounting the first member to one of said door and a frame therefor and for mounting said second member to the other of said door and said frame, and first resilient means, effective when said door is closed, to urge said pole pieces into contact with said second member, characterized in that said pole pieces are dimensioned to limit the amount of magnetic flux, originating from said permanent magnet, applied to said second member, when the door is closed, to a level commensurate with an amount of flux which is available from said permanent magnet when subjected to temperatures at the upper end of said range; opening of said door thus requiring application thereto of substantially the same amount of force, irrespective of the temperature within said range to which at least said first and second members are subjected. - Further according to the present invention there is provided an oven door and frame assembly including one or more door catches as described in the immediately preceding paragraph.
- Still further according to the present invention there is provided an oven including an oven door and frame assembly as described in the immediately preceding paragraph.
- The first resilient means is preferably a leaf spring which in use is positioned behind the first member in a housing on the door or frame, the spring being arranged to bear against a rear wall of the housing to allow sliding movement of the first member in the housing.
- The first member may be attached to a door or frame by means of a cover plate which extends over the member but allows at least part of the pole pieces to be exposed to attract the second member. The cover plate may be fixed to a housing in which the first member is mounted.
- Preferably, a second resilient means is provided which, in use, biasses one of the first and second members to permit the door to open from the frame before the first and second members are parted from one another. The second resilient means therefore, allows a more controlled latching and unlatching operation since it cuts down the initial force required to open the door, by allowing one of the first and second members to move initially against biassing and relative to its fixing on the door or frame.
- The second resilient means, preferably, comprises two helical-coiled compression springs mounted on opposed sides of one of the first and second members on rods lying parallel to the force of attraction between the first and second members, said one of the first and second members being movable with the rods as the springs are compressed.
- Two embodiments of a magnetic door catch in accordance with the invention will now be described, by way of example only, with reference to the accompanying drawings in which:-
- Figures 1 a and 1 b show isometric views of two main component parts of the first embodiment which are to be respectively attached to the door and frame assembly of an oven,
- Figure 2 shows an end view of one of the two main component parts fitted with a cover plate;
- Figure 3 shows a cut-away sectional side view of the first embodiment in which the two main component parts are respectively mounted on a door and frame assembly of an oven;
- Figure 4 shows a graph illustrating the variation with temperature of the force necessary to open the oven door shown in figure 3;
- Figure 5 shows a sectional side view of the second embodiment which is similar to Figure 3, and
- Figure 6 shows a spring clip.
- Referring firstly to Figure 1 a, a first member in the form of
main component part 10 of a magnetic door catch, which may be mounted to an oven door, comprises a body in the form of aflat plate 11 made of a permanent magnetic material, such as barium ferrite or strontium ferrite, for example, sandwiched between a pair offlat plates - Since the ferrite material is magnetised perpendicularly to its major surfaces the
plates component part 10 is co-operable with a second member in the form of anothermain component part 20 comprising a flat, ferromagnetic striking plate shown at 20 in Figure 1 b, which is attracted thereto so as to effect latching of the door. As shown in figure 1 a, eachplate rectangular notch flat plate 11 to form agap 16. - As shown in Figure 2, a
cover plate 30 is provided, which has four rectangular apertures through which the projections protrude. Thecomponent part 10 may then be mounted in a convenient manner to a door and thecover plate 30 fitted by suitable means such as screws, so as to lie substantially in the plane of the inwardly facing surface of the door. - The attachment of the door catch to an oven door and frame assembly is shown in the sectional side view of Figure 3. Part of an oven door chassis is shown at 100 in the left hand portion of the figure and this has an
aperture 101 which accommodates ahousing 102 in which is slidably mounted the doorcatch component part 10. Thehousing 102 is screwed to the frame byscrews 104 which pass through flanges 102' on the housing but alternatively the housing could be integral with the frame. Thepart 10 is shown in partly cut away form so that one of the plates forming a pole piece (shown at, 12, say, in Figure 1) is shown partially in side view at 201 whilst the other plate (13 say) forming the other polepiece is shown in sectional view at 202. Theplates magnetic body 11 are urged towards the cover plate by first resilient means in the form ofleaf spring 204 which is seated against arear wall 103 of thehousing 102. Thebody 11 is slidably in thehousing 102. Other first resilient means, a rubber pad or spring, for example, could alternatively be used. - The
striking plate 20, against which thedoor 100 is latched, in the right hand portion of the drawing is mounted, in a manner to be described below, into aframe 301 of the oven. - The graph shown in Figure 4 illustrates the variation with temperature of the force required to open the oven door shown in figure 3, that is the force required to overcome the attraction between the main component parts, 10, 11 of the catch. In initial experiments the
plates - It will be appreciated that while in the aforedescribed embodiment the thickness of the
plates - Hitherto, as previously explained, in opening the door, a relatively large initial force is required to overcome the latching force of the catch, but once this latching force has been overcome and the door has started to open the required opening force falls rapidly to zero, resulting in an uncontrolled unlatching operation. To alleviate this problem in the aforedescribed embodiment the
striking plate 11 is not fixedly mounted in the body of the oven but is mounted so as to be capable of executing a small movement relative thereto against the action of second resilient means which acts in a direction opposed to the movement of the door as it opens. This is achieved by mounting on opposed sides of thestriking plate 11 two spacedrods frame 301 of the oven. Eachrod nut 304, and a helical compression spring S is interposed between each nut and theframe 301 to effect a resilient biasing action. This arrangement provides for a controlled opening of the door since when the door is initially opened the striking plate remains in contact with the magnetic part of the catch and moves with therods - Figure 5 shows and alternative arrangement in which the second resilient means S (which is similar to that shown in the figure) is arranged to bias the
component part 10 rather than thestriking plate 20. As thedoor 100 is opened thecomponent part 10 moves a small distance out of the door with its housing against the action of helical coiled compression springs (only one of which is shown in the figure) until the force is overcome and thestriking plate 20 separates from thepart 10. - In addition a
rubber pad 305 is positioned between thestriking plate 20 and thedoor frame 301 to cushion the plate on the frame and reduce sound effects. Alternatively, a leaf spring could be used instead of one pad. Thepad 305 is 2 mm thick. - The
cover plate 30 may be, as in this embodiment, fixed to the housing by crimping the ends of the plate over flanges on the housing, and/or so that the housing is capable of moving with the cover plate relative to the door. - Figure 6 shows a bifurcated spring clip Z which may be used in conjunction with each rod and helical coiled spring S instead of
nuts 304. The spring clip Z co-operates with an annular notch cut into the rod (which eliminates the need for the rod to be screw-threaded) to limit the movement of the helical coiled spring along the rod. - Although, in the two embodiments described the first member is to be mounted to a door and the second to a frame it may be preferred to have an arrangement where the first member is mounted to the frame and second to the door.
- One or more door catches may be provided on the same door and frame assembly.
Claims (10)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8032033 | 1980-10-03 | ||
GB8032033 | 1980-10-03 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0049580A1 EP0049580A1 (en) | 1982-04-14 |
EP0049580B1 true EP0049580B1 (en) | 1984-05-02 |
Family
ID=10516468
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19810304312 Expired EP0049580B1 (en) | 1980-10-03 | 1981-09-21 | Magnetic door catches |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0049580B1 (en) |
JP (1) | JPS5785468A (en) |
DE (1) | DE3163406D1 (en) |
DK (1) | DK438281A (en) |
ES (1) | ES273285Y (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013173660A2 (en) * | 2012-05-16 | 2013-11-21 | Coman Ronald E | Permanent magnet panel fastener |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59174504U (en) * | 1983-05-10 | 1984-11-21 | 株式会社日立ホームテック | Door closing structure for ovens, etc. |
US4981312A (en) * | 1988-06-29 | 1991-01-01 | Harrow Products, Inc. | Electromagnetic shear lock |
BRPI0518369A2 (en) * | 2004-12-07 | 2008-11-18 | Sensormatic Electronics Corp | safety device having a cable |
DE202005004734U1 (en) * | 2005-03-21 | 2005-05-25 | Max Blank Gmbh | Wood stove |
JP2007026771A (en) * | 2005-07-13 | 2007-02-01 | Miwa Lock Co Ltd | Door switch element |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1127509B (en) * | 1957-06-25 | 1962-04-12 | Beteiligungs & Patentverw Gmbh | Holding magnet system with permanent magnet made of oxide material |
DE1995429U (en) * | 1968-07-26 | 1968-10-24 | Vaillant Joh Kg | ADHESIVE MAGNET ARRANGEMENT IN SHEET STEEL SHEATHING OF HOUSEHOLD APPLIANCES. |
US3615499A (en) * | 1968-10-02 | 1971-10-26 | Eastman Kodak Co | Photographic processes |
DE6910587U (en) * | 1969-03-15 | 1973-09-27 | Peter Weigelt | MAGNETIC CLOSURE. |
DE1929907A1 (en) * | 1969-06-12 | 1970-12-17 | Simon Fa Karl | Magnetic snap |
DE7921305U1 (en) * | 1979-07-25 | 1979-10-18 | Bosch-Siemens Hausgeraete Gmbh, 7000 Stuttgart | COOKING APPLIANCE WITH A COOKING COMPARTMENT THAT CAN BE SEALED BY A DOOR |
-
1981
- 1981-09-21 DE DE8181304312T patent/DE3163406D1/en not_active Expired
- 1981-09-21 EP EP19810304312 patent/EP0049580B1/en not_active Expired
- 1981-09-29 JP JP15471581A patent/JPS5785468A/en active Pending
- 1981-10-02 ES ES1981273285U patent/ES273285Y/en not_active Expired
- 1981-10-02 DK DK438281A patent/DK438281A/en not_active Application Discontinuation
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013173660A2 (en) * | 2012-05-16 | 2013-11-21 | Coman Ronald E | Permanent magnet panel fastener |
WO2013173660A3 (en) * | 2012-05-16 | 2014-03-13 | Coman Ronald E | Permanent magnet panel fastener |
Also Published As
Publication number | Publication date |
---|---|
DE3163406D1 (en) | 1984-06-07 |
EP0049580A1 (en) | 1982-04-14 |
DK438281A (en) | 1982-04-04 |
JPS5785468A (en) | 1982-05-28 |
ES273285Y (en) | 1984-06-01 |
ES273285U (en) | 1983-11-16 |
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