EP2175200A1 - Dispositif de fermeture de porte en particulier d'un four à pyrolyse - Google Patents

Dispositif de fermeture de porte en particulier d'un four à pyrolyse Download PDF

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Publication number
EP2175200A1
EP2175200A1 EP08425660A EP08425660A EP2175200A1 EP 2175200 A1 EP2175200 A1 EP 2175200A1 EP 08425660 A EP08425660 A EP 08425660A EP 08425660 A EP08425660 A EP 08425660A EP 2175200 A1 EP2175200 A1 EP 2175200A1
Authority
EP
European Patent Office
Prior art keywords
door
lever
door locking
locking device
holder wheel
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.)
Withdrawn
Application number
EP08425660A
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German (de)
English (en)
Inventor
Onofrio Rocchitelli
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Elettrotecnica Rold SRL
Original Assignee
Elettrotecnica Rold SRL
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Elettrotecnica Rold SRL filed Critical Elettrotecnica Rold SRL
Priority to EP08425660A priority Critical patent/EP2175200A1/fr
Publication of EP2175200A1 publication Critical patent/EP2175200A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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

  • the present invention relates to a so-called door locking device, specifically for an oven.
  • the temperature inside the oven is therefore very high, which makes the operation itself very dangerous should the door of the oven be accidentally opened by the user.
  • the main task of the present invention is therefore to provide a door locking device, specifically for pyrolytic ovens, but not only, with improved effectiveness from the point of view of safety.
  • the object of the present invention is to provide a door locking device that is able to effectively satisfy a plurality of required functional and safety specifications of the component.
  • a further object of the present invention is to provide a door locking device whose safety functions include the presence of an electronic and mechanical redundancy of the control device.
  • the object of the present invention is to provide a door locking device that also includes a "door open” safety function against the start of the pyrolysis function when the oven door is open, a “door opening during the locking step” safety function that prevents the pyrolysis function from starting in the case of the voluntary opening of the oven after the door locking latch begins to close but before the latch engages, a "self-repair” function, and a “reset” function.
  • an automatic door locking device characterised in that it includes a plurality of safety means.
  • the device 1 includes a basic structure 1a which is adapted to be integrally joined to the household electrical appliance, in particular to an oven, and properly shaped so as to contain a plurality of micro-switches A, B, C and D.
  • a basic structure 1a which is adapted to be integrally joined to the household electrical appliance, in particular to an oven, and properly shaped so as to contain a plurality of micro-switches A, B, C and D.
  • micro-switches are placed near the outside edge of the basic device structure 1a, so that the other components illustrated below are accommodated close to the centre of said basic structure 1a.
  • the device according to the present invention includes first safety means to prevent the pyrolysis function from being activated while the oven door is not closed.
  • Said first safety means specifically include a door closing lever 20, which may translate with respect to said basic structure 1a and is adapted to abut, with one end 21 thereof, against an appropriate backing plate 70a provided on the door of the oven 70 when such a door is gradually closed. Closing the oven door firstly causes the end 21 of the lever to abut against the backing plate 70a, followed by the translation of the lever 20 itself, which is pushed by the backing plate 70a.
  • Elastic means act between the lever 20 and the basic structure 1a of said device.
  • a helical spring is provided, which is positioned inside the cavity 24a and adapted to act between a first backing plate on said lever 20 and a second backing plate on said basic structure 1a, so that such a spring opposes the translation of said lever caused by closing the door.
  • a second spring is accommodated in the cavity 24b, as seen in figure 1 , which is substantially identical to the first. The second elastic spring serves the same function as the first.
  • the bias of the springs tends therefore to return the door closing lever 20 to the position shown in figure 1 corresponding to the situation in which the door of the household electrical appliance is open.
  • Said first safety means for preventing the oven door from opening when the pyrolysis function has been initiated also including a lever-holder wheel 40, rotationally connected to said basic structure 1a, and a switch activation lever 30, connected in turn to said lever-holder wheel 40.
  • lever-holder wheel 40 and the activation lever 30 are connected to each other.
  • the lever-holder wheel 40 to which the door lever or closing latch 50 is connected has a central portion 44 adapted to support said switch activation lever 30, as can be clearly seen in figure 4 .
  • the activation lever 30 has a radial extension 30a at one end thereof, in which a guide 34 is cut with a substantially curved shape.
  • connection between the lever-holder wheel 40 and the activation lever 30 is achieved also by means of a pin 43 which is adapted to slide within said guide 34 cut into said switch activation lever 30.
  • the guide or slot 34 has a curved profile, so that the relative rotation of the lever-holder wheel 40 with respect to the activation lever 30 about the same rotation axis I which is substantially perpendicular to the surface of said basic structure 1a is guided by sliding the pin 43 into the guide 34.
  • an elastic element 60 which in the embodiment shown in the figures consists of a helical spring accommodated in a seat provided for the purpose, acts between said switch activation lever 30 and said lever-holder wheel 40 so as to oppose relative rotations in opposite directions of the two elements.
  • an electric motor 90 is connected to said switch activation lever 30 by means of the appropriately shaped central slot 32.
  • the device according to the present invention may also be driven by other means suitable for the purpose according to the known state of the art.
  • the synchronous electric motor may be replaced with a solenoid.
  • the electric motor 90 is therefore adapted to rotate the switch activation lever 30 about the axis A. By means of the pin 43 and the guide 34, the switch activation lever 30 then rotates the lever-holder wheel 40.
  • the electric motor 90 may naturally be replaced by other mechanisms having the same function of moving the device, but without departing from the scope of the present invention.
  • a drive pin 31 substantially cylindrical shaped, which extends perpendicularly from said radial extension 30a towards the surface of said basic structure 1a.
  • Said drive pin 31 is adapted to be inserted into a guide slot 81 specifically made in a slide 80 adapted to slide on the surface of said basic structure 1a.
  • the slide 80 is able to translate due to the rotation of the activation lever 30.
  • the drive pin 31 is inserted indeed into a guide 81 made on said slide 80 and has a substantially curved profile, so that the rotation of the activation lever 30 corresponds to the translation of the slide 80.
  • the slide 80 has a profile specifically shaped to come into contact with and activate in turn one or more micro-switches, in particular the slide 80 is adapted to come into contact with and activate the micro-switch B, which signals the position of the closing latch 50 in the door locking position.
  • the drive pin 31 also serves a mechanical safety function relative to the activation of the door locking device when the oven door is open.
  • a mechanical safety function is obtained due to the particular conformation of the door closing lever 20.
  • the backing plate 22a houses the drive pin 31 thus preventing the rotation of the activation lever 30, and of the lever-holder wheel 40 therewith.
  • the device according to the present invention also includes second safety means adapted to prevent the pyrolysis function from starting when the door 70 is opened during the activation of the device, thus achieving the "door open during the locking step" function.
  • said door closing lever 20 has a second backing plate 23 along its length, which is adapted to house a projection 41a extending in a substantially vertical direction from a radial expansion 41 specifically provided on said lever-holder wheel 40.
  • the view in figure 4 illustrates the situation in which the door closing lever 20 is in the position corresponding to the door open, while the device has started to work and the door closing latch is moving towards the stroke end position.
  • the backing plate 23 in this case strikes the projection 41a preventing the lever-holder wheel 40 from performing the entire rotation and activating the stroke end micro-switch C by means of its profile. Such a situation may only occur in the event of a voluntary opening of the door once the device has been previously activated and has started to work.
  • the backing plate 23 placed on the lever 20 prevents the lever-holder wheel 40 from completing its rotation and activating the stroke end micro-switch C. This achieves the safety function related to the door opening during the locking step.
  • the latch 50 when the latch 50 is closed by the action of the electric motor, the latch engages the backing plate 70a integral with the oven door 70, in particular by means of its end 51 in the shape of a hook.
  • the end of the lever or latch 50 has an internal profile at the end 51 which is substantially perpendicular to the longitudinal extension of the lever 50, while the surface facing the oven door is shaped so that the initial portion 52 has an inclined plane.
  • this inclined surface 52 allows the device to have a self-repair function.
  • the presence of the inclined plane 52 allows the force acting on the lever to be converted into a radial component with respect to the lever-holder wheel 40 to which the lever 50 is connected. This radial component causes a rotation of the lever 50 itself that allows the lever to lift over the backing plate 70a.
  • a further additional function of the device according to the present invention is the reset function.
  • the door closing lever 20 is biased by the spring acting between said lever 20 and said basic structure 1a to be placed in the door open position, which should nevertheless correspond to a position of the lever-holder wheel 40 corresponding to the opening position shown in figure 1 .
  • chute or inclined plane 22b at the end 22 of the door closing lever 20, on the end side opposite to the backing plate 22a, allows the drive pin 31 integral with the activation lever 30 to slip along such an inclined plane overcoming the resistance of the spring, not shown, inserted in the housing 24 and acting between said lever 20 and said basic structure 1a, moving the door closing lever 20 which translates until the drive pin 31 reaches its seat again, close to 22a, thus returning to the correct starting configuration of door open.
  • lever or latch 50 is preferably made of metal material, while all the other parts and components of the device may be made of plastic material.
  • the door locking device 1 operates as follows.
  • the oven door is open and therefore the oven electronics prevent the pyrolysis function from starting due to the fact that the door closing lever 20 detects the door open condition and does not close the contact on the micro-switch A.
  • the lever 20 When the door 70 is manually closed by the user, the lever 20 is pushed towards the inside of the device, into the door closed position shown in figure 2 , and the micro-switch A is activated. At this point, the oven control electronics receive the signal that the door is closed and may start closing the door locking device. The motor 90 is then activated by closing the lever or latch 50. Since the lever 20 is in a position corresponding to the door closed condition, the backing plate 22a does not hold the drive pin 31 and the rotation neither of the lever-holder wheel 40 nor of the activation lever 30 that integrally rotates with the lever-holder wheel 40 because of the pin 43 striking the guide 34.
  • the electric motor then moves the latch 50 to the door locked position, with the end 51 of the latch cooperating with the backing plate 70a as shown in figure 2 .
  • the drive pin 31 integral with said activation lever 30 rotates and moves along the guide 81 provided on the slide 80. Because of the curved profile of the guide 81, the slide 80 translates and activates the auxiliary micro-switch B and the auxiliary micro-switch D, which serve the same function.
  • the lever-holder wheel 40 comes against the contact of the stroke end micro-switch C, which sends the signal to stop the electric motor to the oven control electronics, thus stopping the device in the door locked position, with the auxiliary micro-switch B and door closed micro-switch A closed, which for the control electronics means a condition in which it is possible to start the pyrolysis function.
  • the oven control electronics activate the motor 90 again, thus causing the opening of the door lock 50, and the user can normally open the oven.
  • the door locking device according to the present invention has a multiplicity of safety functions.
  • the door closing lever 20 is thus kept in the position shown in figure 1 , corresponding to the door open condition, by the presence of the elastic spring, not depicted in the figures, which acts between said lever 20 and the basic structure 20.
  • the micro-switch A which is activated by the door closing lever 20 when the lever translates by closing the door and thus by means of the thrust applied to the lever by the backing plate 70a against the end 21 of the lever 20, is not activated, whereby it does not send the door closed signal to the oven control electronics, and the pyrolysis function may not be started.
  • the device according to the present invention has a second, mechanical-type safety control consisting of the described backing plate 22a specifically provided on the lever 20 and adapted to prevent, by holding the drive pin 31, the rotation of the activation lever 30 and, subsequently, of the lever-holder wheel 40, which is held by the pin 43 striking against the wall of the guide 34.
  • the device 1 according to the present invention therefore has a mechanical redundancy on the safety device which prevents the door lock from being activated, and therefore the pyrolysis function, when this is selected with the oven door open.
  • Such a safety function consists in opening the door by the user, once the pyrolysis function has been selected on the oven electronics, but before the latch 50 locks the door 70.
  • the door closing lever 20 will be in a position corresponding to the door open condition, and the backing plate 23 on the lever 20 prevents the further rotation of the lever-holder wheel 40 by striking against the projection 41a and thus preventing the lever-holder wheel 40 from activating the stroke end micro-switch C, by continuing the rotation imposed by the motor 90.
  • the device according to the present invention is also provided with a self-repair function in the event of the forceful closure of the door by the user, even if the door locking lever 50 is in the closed position.
  • the reset function has also been illustrated, which makes it possible to return the device to its initial, correct configuration even in the event that the user forcibly opens the door during rotation of the door lock lever 50.
  • the door locking device according to the present invention is particularly effective from the point of view of safety.
  • An object achieved by the present invention is to provide a door locking device which has both mechanical and electrical-type safety means.
  • a further object achieved by the present invention is to provide a door locking device that includes a plurality of safety functions, while remaining an extremely compact and reliable device.
  • an object achieved by the device according to the present invention is to provide the "door open” safety function, the "door opening during the locking step” function, a “self-repair” function and a “reset” function in a single device.
  • the door locking device according to the present invention is extremely compact and simple to be constructed, despite incorporating a plurality of functions.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electric Ovens (AREA)
EP08425660A 2008-10-10 2008-10-10 Dispositif de fermeture de porte en particulier d'un four à pyrolyse Withdrawn EP2175200A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08425660A EP2175200A1 (fr) 2008-10-10 2008-10-10 Dispositif de fermeture de porte en particulier d'un four à pyrolyse

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08425660A EP2175200A1 (fr) 2008-10-10 2008-10-10 Dispositif de fermeture de porte en particulier d'un four à pyrolyse

Publications (1)

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EP2175200A1 true EP2175200A1 (fr) 2010-04-14

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EP08425660A Withdrawn EP2175200A1 (fr) 2008-10-10 2008-10-10 Dispositif de fermeture de porte en particulier d'un four à pyrolyse

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2450510A2 (fr) 2010-11-08 2012-05-09 Eltek S.p.A. Dispositif de verrouillage de porte pour un appareil ménager et mécanisme bistable
CN109330401A (zh) * 2018-11-28 2019-02-15 黄后君 一种烤箱

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2213462A1 (fr) * 1973-01-10 1974-08-02 Dietrich & Cie De
US5419305A (en) * 1993-09-02 1995-05-30 Hanley; Roger T. Automatic bimetal safety latch for self-cleaning oven doors
DE19846862A1 (de) * 1998-10-12 2000-04-13 Bsh Bosch Siemens Hausgeraete Gargerät für Hochtemperatur- und/oder Mikrowellenbetrieb mit Türverriegelungseinrichtung
US6079756A (en) * 1998-01-28 2000-06-27 Whirlpool Corporation Oven door latch
US20030116975A1 (en) * 2001-12-21 2003-06-26 Cole Ronald E. Door latch mechanism and associated components for a self-cleaning oven
EP1418385A2 (fr) * 2002-11-05 2004-05-12 LTD Locking Technologies and Devices GmbH Dispositif de verrouillage de porte pour four de cuisson
US20050121919A1 (en) * 2003-12-08 2005-06-09 Smock Steve W. Motorized oven lock
DE102004061231B3 (de) * 2004-12-20 2006-04-20 Ellenberger & Poensgen Gmbh Türverriegelung für einen Herd
US20060102166A1 (en) * 2004-11-12 2006-05-18 Bsh Home Appliances Corporation Motor driven oven door latch
EP1703212A2 (fr) * 2005-03-17 2006-09-20 ELTEK S.p.A. Dispositif de verrouillage de porte pour appareil ménager, en particulier four de cuisson

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2213462A1 (fr) * 1973-01-10 1974-08-02 Dietrich & Cie De
US5419305A (en) * 1993-09-02 1995-05-30 Hanley; Roger T. Automatic bimetal safety latch for self-cleaning oven doors
US6079756A (en) * 1998-01-28 2000-06-27 Whirlpool Corporation Oven door latch
DE19846862A1 (de) * 1998-10-12 2000-04-13 Bsh Bosch Siemens Hausgeraete Gargerät für Hochtemperatur- und/oder Mikrowellenbetrieb mit Türverriegelungseinrichtung
US20030116975A1 (en) * 2001-12-21 2003-06-26 Cole Ronald E. Door latch mechanism and associated components for a self-cleaning oven
EP1418385A2 (fr) * 2002-11-05 2004-05-12 LTD Locking Technologies and Devices GmbH Dispositif de verrouillage de porte pour four de cuisson
US20050121919A1 (en) * 2003-12-08 2005-06-09 Smock Steve W. Motorized oven lock
US20060102166A1 (en) * 2004-11-12 2006-05-18 Bsh Home Appliances Corporation Motor driven oven door latch
DE102004061231B3 (de) * 2004-12-20 2006-04-20 Ellenberger & Poensgen Gmbh Türverriegelung für einen Herd
EP1703212A2 (fr) * 2005-03-17 2006-09-20 ELTEK S.p.A. Dispositif de verrouillage de porte pour appareil ménager, en particulier four de cuisson

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2450510A2 (fr) 2010-11-08 2012-05-09 Eltek S.p.A. Dispositif de verrouillage de porte pour un appareil ménager et mécanisme bistable
CN109330401A (zh) * 2018-11-28 2019-02-15 黄后君 一种烤箱

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