Classifications

• • H—ELECTRICITY
  • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
  • H05B6/00—Heating by electric, magnetic or electromagnetic fields
  • H05B6/64—Heating using microwaves
  • H05B6/6414—Aspects relating to the door of the microwave heating apparatus
  • H05B6/6417—Door interlocks of the microwave heating apparatus and related circuits
• • E—FIXED CONSTRUCTIONS
  • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
  • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
  • E05B47/00—Operating or controlling locks or other fastening devices by electric or magnetic means
  • E05B47/0001—Operating or controlling locks or other fastening devices by electric or magnetic means with electric actuators; Constructional features thereof
  • E05B47/0012—Operating or controlling locks or other fastening devices by electric or magnetic means with electric actuators; Constructional features thereof with rotary electromotors
• • E—FIXED CONSTRUCTIONS
  • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
  • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
  • E05B47/00—Operating or controlling locks or other fastening devices by electric or magnetic means
  • E05B47/0046—Electric or magnetic means in the striker or on the frame; Operating or controlling the striker plate
• • E—FIXED CONSTRUCTIONS
  • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
  • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
  • E05B63/00—Locks or fastenings with special structural characteristics
  • E05B63/24—Arrangements in which the fastening members which engage one another are mounted respectively on the wing and the frame and are both movable, e.g. for release by moving either of them
  • E05B63/248—Arrangements in which the fastening members which engage one another are mounted respectively on the wing and the frame and are both movable, e.g. for release by moving either of them the striker being movable for latching, and pushed back by a member on the wing for unlatching, or vice versa
• • 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
• • E—FIXED CONSTRUCTIONS
  • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
  • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
  • E05B47/00—Operating or controlling locks or other fastening devices by electric or magnetic means
  • E05B47/0001—Operating or controlling locks or other fastening devices by electric or magnetic means with electric actuators; Constructional features thereof
  • E05B2047/0014—Constructional features of actuators or power transmissions therefor
  • E05B2047/0018—Details of actuator transmissions
  • E05B2047/0024—Cams
• • E—FIXED CONSTRUCTIONS
  • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
  • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
  • E05B47/00—Operating or controlling locks or other fastening devices by electric or magnetic means
  • E05B2047/0048—Circuits, feeding, monitoring
  • E05B2047/0067—Monitoring
  • E05B2047/0068—Door closed

Definitions

• the present invention relates to a heating cooking apparatus such as an oven and a microwave oven, comprising a door release mechanism.
• a heating cooking apparatus such as an oven and a microwave oven
• the present application claims priority from JP 2019-029568 filed in Japan on February 21, 2019 .
• PTL 1 discloses a door release mechanism including a hold mechanism that can engage with a door of a home appliance such as a heating cooking apparatus and that can shift between a first arrangement in which the door is held in a closed position and a second arrangement in which the door is open, a cam having a plurality of cam surfaces, and a motor for driving the cam in response to a control signal.
• the hold mechanism includes a hook spacer sliding with respect to the cam surface and rotate the hook spacer by rotation of the cam to push up a door key provided to the door. The pushed up door key climbs over an engagement receptacle to release the engagement, and the door is opened.
• an effect is exhibited that the door release mechanism of the heating cooking apparatus can quickly open a door using a motor having a small torque.
• FIG. 1 is a perspective view illustrating an appearance of a heating cooking apparatus 1 according to the present embodiment.
• FIG. 2 is a front view of the heating cooking apparatus 1 illustrated in FIG. 1 in a state in which the front door 3 is opened.
• the heating cooking apparatus 1 is, for example, a microwave oven and includes a front door (door) 3 covering a heating chamber 4 on the front face of a cooking apparatus main body 2.
• the front door 3 is a lateral opening type in which an end portion on the left side (left side as viewed) is hinged. Note that the present invention can also be applied to a door in which the right side, the upper side, or the lower side is hinged.
• the front door 3 is provided with a latch head member 21 (see FIG. 4 ) in the door housing of the right end portion serving as the open end.
• the latch head member 21 includes latch heads (engagement portions) 22 including engagement claw potions 22a at the tip portions at two upper and lower locations.
• the latch heads 22 protrude from openings 3a and 3a formed in the door housing of the front door 3.
• the cooking apparatus main body 2 includes latch hooks (engagement receptacles) 25 and 25 (see FIG. 4 ) engaging with the latch heads 22 and 22 provided in the front door 3 and a door release mechanism 10 in a main body housing on the right front side. Openings 2a and 2a for receiving the latch heads 22 provided in the front door 3 are formed in the main body housing on the right front side of the cooking apparatus main body 2.
• the latch head 22 engages with the latch hook 25, so that the front door 3 is in a closed state.
• the latch head 22 and the latch hook 25 constitute a latch mechanism holding the front door 3 in the closed state.
• the door release mechanism 10 is a mechanism that releases the engagement between the latch head 22 and the latch hook 25 to open the front door 3.
• the door release mechanism 10 includes a motor 12 (see FIG. 4 ), and electrically releases the engagement to open the front door 3.
• the heating cooking apparatus 1 includes an operation panel 5 above the front door 3.
• the operation panel 5 is provided with a door opening switch 6 for opening the front door 3.
• FIG. 3 is a block diagram illustrating a configuration of a control device included in the heating cooking apparatus 1.
• the control device includes a control unit 30 for controlling operations of the heating cooking apparatus 1.
• the control unit 30 is constituted of a microcomputer, for example, and includes a CPU, a ROM, and a RAM. As illustrated in FIG. 3 , the operation panel 5, a heating operation unit 31, a front door open-close detection unit 32, the motor 12 of the door release mechanism 10, and the like are connected to the control unit 30.
• the heating operation unit 31 is an operation unit for heating the food product placed in the heating chamber 4, and is a heating device such as a microwave output device and a heater in a case where the heating cooking apparatus 1 is a microwave oven.
• the control unit 30 When the control unit 30 is instructed to start the cooking by receiving input of the heating cooking condition and the like using the operation panel 5 and determines that the front door 3 is in the closed state, the control unit 30 operates the heating operation unit 31 to start cooking.
• the front door open-close detection unit 32 includes three closed state detection switches SW1 to SW3 described later. In a case where the control unit 30 receives, from all of the three closed state detection switches SW1 to SW3, signals indicating that a knob 60 (see FIG. 5 ) is depressed, the control unit 30 determines that the front door 3 is in the closed state.
• the motor 12 of the door release mechanism 10 rotates a cam 11 described later (see FIG. 5 ).
• the door opening switch 6 of the operation panel 5 is operated, so that the control unit 30 drives the motor 12.
• FIG. 4 is a perspective view illustrating a configuration of the latch mechanism and the door release mechanism 10.
• FIG. 5 is a view illustrating the internal structure of the main portion to which the latch mechanism and the door release mechanism 10 are attached. In FIG. 4 and FIG. 5 , the front door 3 is in the closed state. In FIG. 5 , the illustration of the motor 12 is omitted.
• FIG. 6 is a perspective view of the hook forming body 40 in which the latch hook 25 of the latch mechanism is formed.
• FIG. 7 is an enlarged view of a portion surrounded by a square in FIG. 5 .
• the latch heads 22 and 22 provided to the front door 3 and the latch hooks 25 and 25 provided to the cooking apparatus main body 2 constitute the latch mechanism.
• the latch head member 21 provided with the latch heads 22 and 22 is vertically movably attached in the door housing of the front door 3 and is biased downward by a door spring 23.
• the latch heads 22 and 22 are provided to one latch head member 21, so that the latch heads 22 and 22 integrally move.
• the latch heads 22 and 22 are inclined upward as they are away from the rod-shaped portion of the latch head member 21, and a tip portions thereof are bent downward.
• the bent tip portions are engagement claw portions 22a and 22a that engage with the latch hooks 25.
• the lower end of the engagement claw portion 22a of the upper side that is lifted by the latch lever 13 among the engagement claw portions 22a and 22a is rounded and is formed to slide smoothly with respect to the latch lever 13.
• the latch hooks 25 and 25 are formed on the hook forming body 40.
• the hook forming body 40 is a substrate formed from a vertically elongated resin molded article.
• the closed state detection switches SW1 to SW3 for detecting the closed state of the front door 3, and the cam 11, the motor 12, the latch lever 13, the latch spring 14, the cam position detection switch SW4, and the like that are the components of the door release mechanism 10 are attached to one face of the hook forming body 40.
• the hook forming body 40 is a support body of the closed state detection switches SW1 to SW3 and the components of the door release mechanism 10.
• An inclined surface portions 46 and 46 with which the lower ends of the engagement claw portions 22a and 22a of the latch heads 22 and 22 come into contact when the front door 3 opens and closes are formed on the front door 3 side of the latch hooks 25 and 25 in the hook forming body 40.
• the closed state detection switch (second switch) SW1 is attached on a top stage of the hook forming body 40
• the closed state detection switch (first switch) SW2 is attached on a middle stage
• the closed state detection switch SW3 is attached on a bottom stage.
• the closed state detection switch SW1 on the top stage is positioned such that the knob 60 is depressed by the tip of the engagement claw portion 22a of the latch head 22 of the upper side.
• the closed state detection switch SW3 on the bottom stage is positioned such that the knob 60 is depressed by the lower end of the engagement claw portion 22a of the latch head 22 of the lower side.
• the closed state detection switch SW2 on the middle stage is positioned such that the knob 60 is depressed by the latch lever 13 which is depressed by the engagement claw portion 22a of the latch head 22 of the upper side to move downward (in a second direction) and reaches the lower position.
• the door release mechanism 10 includes at least the motor 12, the cam 11 rotated by the motor 12, and the latch lever (linear moving member) 13 linearly moving upward (in the first direction) by the rotation of the cam 11 to move the latch head 22 of the upper side in a direction in which the latch hook 25 is released.
• the cam 11 and the motor 12 are attached to a vertically central portion of the hook forming body 40.
• the motor 12 rotationally drives the cam 11, and the cam 11 is fixed to a shaft (not illustrated) of the motor 12.
• the cam 11 includes a plurality of cam surfaces 11a sliding with respect to the lower end of the latch lever 13 to move the latch lever 13 upward.
• the cam position detection switch SW4 is provided to detect the position of the cam 11.
• the latch lever 13 is arranged between a guide long wall (guide wall) 41 and a guide short wall (guide wall) 42 formed on the hook forming body 40.
• the latch lever 13 is attached to be linearly movable in the vertical direction along the guide long wall 41 and the guide short wall 42.
• the latch lever 13 has an elongated shape in the vertical direction, which is the direction in which the latch lever 13 lineally moves, and one end portion along the lateral direction slides with respect to the cam 11, and the other end portion along the lateral direction abuts the engagement claw portion 22a of the latch head 22 on the upper side. With such a shape, it is possible to achieve a compact configuration in which the dimension of the front-rear direction (sliding direction, open-close direction) of the door release mechanism 10 is suppressed.
• the latch lever 13 is biased upward (in the first direction) by the latch spring 14.
• the latch spring 14 the upper end thereof is latched to a clamp 45 formed on the hook forming body 40, and the lower end thereof is latched to a clamp 13a formed on the latch lever 13.
• the claw portions 43 and 43 has an L shape and are formed on the end surfaces in the height direction of the wall of the guide long wall 41.
• the claw portions 43 and 43 sandwich the wall portion 13b of the latch lever 13 extending in the vertical direction to restrict the movement of the latch lever 13 only in the vertical direction.
• the claw portions 43 are formed at two locations separated from each other in the vertical direction, but the claw portion 43 may be formed at one location.
• FIG. 8 is a view illustrating a state in which the latch lever 13 is inserted into a predetermined position of the hook forming body 40
• (b) of FIG. 8 is a view illustrating a state in which the closed state detection switch SW2 on the middle stage is attached, so that the latch lever 13 is prevented from falling off.
• the latch lever 13 is inserted between the guide long wall 41 and the guide short wall 42 formed on the hook forming body 40 so that the wall portion 13b is sandwiched between the claw portions 43 and 43.
• the closed state detection switch SW2 on the middle stage is attached. Accordingly, since the closed state detection switch SW2 on the middle stage serves as an obstacle, the latch lever 13 cannot reach a position at the time of attachment and detachment in which the latch lever 13 rotates about the clamp 45 illustrated in (a) of FIG. 8 as a fulcrum, and as a result, the latch lever 13 is prevented from falling off.
• the closed state detection switch SW2 on the middle stage prevents the latch lever 13 in a state in which the claw portions 43 and 43 are engaged from falling out.
• the guide short wall 42 is not necessarily required and may be omitted when the latch lever 13 stably linearly moves by only the guide long wall 41.
• projecting portions 44 coming into line contact with the latch lever 13 are provided to the guide long wall 41 and the guide short wall 42.
• the guide long wall 41 and the guide short wall 42 are each provided with two elongated projecting portions 44 extending in the height direction of the walls, and are configured such that the latch lever 13 always comes into contact with the four projecting portions 44 in the movable range. Accordingly, the contact area with respect to the guide long wall 41 and the guide short wall 42 is reduced to suppress friction, and the latch lever 13 can be moved with a smaller force.
• Rattling of the latch lever 13 in the front-rear direction can be eliminated by always keeping contact with projecting portions 44 provided in at least two locations on one side.
• the projecting portions 44 may be formed to extend in the width direction (direction of linear movement) of the wall, in other words, such that the contact area can be reduced.
• a projecting portion 44 coming into contact with the guide long wall 41 and the guide short wall 42 may be provided on the latch lever 13 side.
• FIG. 9 is a cross-sectional view taken along line B-B of (b) of FIG. 8
• FIG. 9 is a perspective view of the latch lever 13 viewed from the side in contact with the hook forming body 40.
• FIG. 10 and FIG. 11 are views illustrating the internal structures of the main portion to which the latch mechanism and the door release mechanism 10 are attached.
• the illustration of the motor 12 is omitted.
• FIG. 5 illustrates a state in which the front door 3 is closed as described above
• FIG. 10 illustrates a state in which the front door 3 is half opened
• FIG. 11 illustrates a state in which the front door 3 is opened.
• the engagement claw portions 22a and 22a of the latch heads 22 and 22 provided to the front door 3 engage with the latch hooks 25 and 25 provided to the cooking apparatus main body 2.
• the latch lever 13 is in a lower position by being pressed down by the lower end of the engagement claw portion 22a of the latch head 22 of the upper side.
• the closed state detection switch SW1 on the upper stage is depressed by the tip of the engagement claw portion 22a of the latch head 22 of the upper side
• the closed state detection switch SW3 on the lower stage is depressed by the lower end of the engagement claw portion 22a of the latch head 22 of the lower side.
• the closed state detection switch SW2 on the middle stage is depressed by the projection 24 of the latch lever 13 moved to the lower position.
• the latch lever 13 lineally moves upward (in the first direction), so that the upper end of the latch lever 13 lifts (pushes up) the lower end of the engagement claw portion 22a of the latch head 22 of the upper side. Accordingly, the engagement claw portion 22a of the latch head 22 of the lower side moving integrally therewith is also lifted.
• the engagement claw portions 22a and 22a of the latch heads 22 and 22 of the upper side and the lower side climb over the latch hooks 25 and 25, the engagements with the latch hooks 25 and 25 are released and the state illustrated in FIG. 10 sifts to the state illustrated in FIG. 11 .
• the latch lever 13 linearly moves by the rotation of the cam 11 to move the latch head 22 in a direction in which the engagement with the latch hook 25 is released, so that the loss of force can be reduced and the torque required for the motor 12 can be reduced compared to the configuration of PTL 1 in which the force obtained by driving the motor is transmitted by a continuous rotation.
• a motor having a small torque can be used as the motor 12, so that the range of selection of the motor 12 is widened and the front door 3 can be opened in a short period of time (quickly opened) after the door opening switch 6 is pressed.
• FIG. 12 illustrates a second embodiment, and is a view illustrating an internal structure of a main portion to which a latch mechanism and a door release mechanism 10A are attached.
• a heating cooking apparatus of the present embodiment includes the door release mechanism 10A instead of the door release mechanism 10.
• the door release mechanism 10A is the same as the door release mechanism 10 except that an engagement wall 48 is included.
• the engagement wall 48 abuts the latch lever 13 to restrict upward movement of the latch lever 13 and prevents the latch lever 13 from coming into contact with a knob (sensing portion) 60 of a closed state detection switch SW1 on the upper stage.
• the engagement wall 48 is provided below the attachment position of the closed state detection switch SW1 on the upper stage in a hook forming body 40.
• FIG. 13 illustrates a third embodiment, and is a view illustrating an internal structure of a main portion to which a latch mechanism and a door release mechanism 10B are attached.
• a heating cooking apparatus 1 includes the door release mechanism 10B instead of the door release mechanism 10A.
• the door release mechanism 10B is the same as the door release mechanism 10A except that a latch lever 53 is included instead of the latch lever 13.
• the latch lever 53 includes an extending portion 54 extending rearward in the sliding direction on a lower end sliding with respect to the cam surface 11a of the cam 11. Note that the latch lever 53 is the same as the latch lever 13 except that the extending portion 54 is included.
• the latch heads 22 and 22 can ensure a sufficient amount of time when the latch heads 22 and 22 climb over the latch hooks 25 and 25 to slide down the forward inclined surface portions 46 and 46 while the latch lever 53 is configured to have an elongated shape in the vertical direction and a reduced dimension in the front-rear direction (sliding direction) of the door release mechanism 10A.

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• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Electromagnetism (AREA)
• Structural Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Electric Ovens (AREA)

Applications Claiming Priority (2)

Publications (3)

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ID=72143679

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Country Status (3)

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Family Cites Families (8)

• 2020
  • 2020-02-17 JP JP2021501961A patent/JPWO2020170993A1/ja active Pending
  • 2020-02-17 WO PCT/JP2020/005930 patent/WO2020170993A1/ja not_active Ceased
  • 2020-02-17 EP EP20760154.3A patent/EP3929491B1/en active Active

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