Door lock and electrical appliance having the same
By combining a cam, an extension arm, and a limit rod, the problem of opposing forces in the spring assembly of existing door locks is solved, thus achieving both security and convenient maintenance of the door lock.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- WENZHOU TIANJIAN ELECTRIC APPLIANCE
- Filing Date
- 2023-11-23
- Publication Date
- 2026-05-19
AI Technical Summary
In existing door locks, after the door hook is locked, the force of the spring assembly is opposite to the expected force, posing a safety hazard.
The system employs a combination structure of cam, extension arm, limit rod, and elastic element. By rotating and sliding the cam and moving the limit rod between different grooves, the system ensures that the force of the elastic element is consistent with the expected force of locking the door, thus solving the safety problem.
The system ensures that the force of the elastic element after the door hook is locked is consistent with the expected force, thus improving the security of the door lock. The detachable design also facilitates assembly and maintenance.
Smart Images
Figure CN117588111B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of door lock technology, specifically to a door lock and an electrical appliance having the same. Background Technology
[0002] During the engagement of the door lock and the door hook, when the door hook is long, it is usually located inside the door lock and needs to be fitted with a sliding latch to facilitate the insertion of the door hook.
[0003] For example, Chinese patent document CN209145427U discloses a door lock for household appliances, which uses two spring assemblies to push the buckle support towards the opening of the door lock. When the door hook is inserted into the buckle, it continues to be inserted into the door lock by overcoming the elastic force of the spring assembly. Under the pushing force of the door hook, the buckle slides away from the door lock opening, so that the door hook is fully inserted into the door lock.
[0004] However, in the above solution, when the door hook is fully inserted into the door lock and locked by the latch, the spring assembly always maintains an elastic force that pushes the latch toward the unlocking direction. In other words, the force of the elastic assembly after locking the door is opposite to the expected force, which poses a certain safety hazard. Summary of the Invention
[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defect of the prior art door locks, in which the force of the spring assembly is opposite to the expected force after the door hook is locked, thereby providing a door lock and an electrical appliance having the same.
[0006] To address the aforementioned technical problems, the present invention provides a door lock, comprising:
[0007] The base has a socket for inserting a door hook;
[0008] A cam is rotatably disposed within the base, the cam having a slot for inserting the door hook; the base has a first groove extending in a direction away from the slot, and the cam's pivot is slidably disposed within the first groove;
[0009] An extension arm is connected to the cam, the extension arm extends outward in the radial direction along the rotation axis of the cam, and a limit rod is connected to the extension arm, the limit rod being parallel to the rotation axis of the cam; the base has a second slide groove for inserting the limit rod, the first section of the second slide groove extending toward the insertion port away from the base, and the second section of the second slide groove extending toward the bayonet port away from the cam.
[0010] An elastic element, connected to the cam, has an elastic force that moves a limiting rod on the extension arm to the end of the first or second segment of the second slide and holds it in that position.
[0011] Optionally, the extension line of the extension arm is arc-shaped, and the center of the arc of the extension line of the extension arm is located on the side close to the cam.
[0012] Optionally, the first section of the second slide groove is parallel to the first slide groove, and the second section of the second slide groove is arc-shaped, with the center of the arc of the second section coinciding with the rotation axis of the cam.
[0013] Optionally, the second section of the second groove extends toward the insertion port away from the base.
[0014] Optionally, the elastic element is a tension spring, the limiting rod is detachably connected to the extension arm, one end of the elastic element is connected to the limiting rod, and the other end of the elastic element is detachably connected to the base.
[0015] Optionally, the base is provided with a mounting groove having an opening, and a pull rod is detachably mounted on the mounting groove from the opening. The pull rod is parallel to the rotating shaft, and the other end of the elastic element is connected to the pull rod.
[0016] Optionally, the mounting groove is opened in a direction away from the insertion port of the base.
[0017] Optionally, as the first slide extends in a direction away from the socket, it also shifts in a direction away from the second segment of the second slide.
[0018] Optionally, the end of the first groove away from the insertion port of the base has an opening.
[0019] Optionally, the extension arm has two arms, which are symmetrically connected to both sides of the cam.
[0020] Optionally, it further includes: a contact switch mounted on the base, one end of the limiting rod extending out of the base, the limiting rod contacting the contact switch during the second section of the second slide groove, and the limiting rod contacting the contact switch during the first section of the second slide groove.
[0021] The present invention provides an electrical appliance, characterized in that it includes a door lock as described in any one of the above-described solutions.
[0022] The technical solution of this invention has the following advantages:
[0023] 1. The door lock provided by this invention, when engaged with a door hook, has a cam that slides and rotates within a first groove of the base. Simultaneously, an extension arm connected to the cam drives a limiting rod to slide within a second groove of the base. Specifically, when the door hook is not inserted, the limiting rod is located at the end of the second section of the second groove and is held in that position by an elastic element. When the door hook is inserted, the cam is first driven to rotate. During this process, the limiting rod overcomes the elastic force of the elastic element and slides from the end of the second section of the second groove toward the first section. When the cam rotates to the angle for locking the door hook, the limiting rod reaches between the second and first sections of the second groove. Then, the door hook continues to be inserted, the cam slides along the first groove, and the limiting rod slides along the first section of the second groove. Finally, the door hook is locked in the locked position. During this process, when the limiting rod slides in the first section of the second groove, the elastic element provides an elastic force that moves the cam toward the locked position and holds the cam in the locked position after the door hook is in place. The force of the elastic element in this structure is the same as the expected force for locking the door, thereby solving the security problem of existing door locks.
[0024] 2. The door lock provided by the present invention can increase the lifespan of the extension arm during long-term use by setting the extension arm to an arc shape, and enable the extension arm to withstand more reverse pulling force towards the back of the arc shape.
[0025] 3. The door lock provided by the present invention uses a second slide groove to restrict the movement path of the limiting rod. When the cam rotates, it drives the limiting rod to move along the second section of the second slide groove. When the cam moves, it drives the limiting rod to move along the first section of the second slide groove. At the same time, the first section of the second slide groove also restricts the rotation of the cam. When the limiting rod moves within the first section of the second slide groove, the cam is kept at the angle for locking the door hook.
[0026] 4. The door lock provided by the present invention, by setting the second section of the second slide groove to extend toward the insertion direction away from the base, allows the limiting rod to slide toward the end within the second section of the second slide groove to better cooperate with the elastic member, so that the elastic member can better keep the limiting rod at the end position of the second section.
[0027] 5. The door lock provided by the present invention, by setting the elastic element as a tension spring, gives it a greater elastic force stroke on the limiting rod, and by setting the elastic element as detachable, facilitates the replacement of the elastic element.
[0028] 6. The door lock provided by the present invention uses a mounting groove on the base for detachably mounting a pull rod, and uses the pull rod to connect the other end of the elastic element, thereby realizing the detachability of the elastic element.
[0029] 7. In the door lock provided by the present invention, the opening of the mounting groove on the base for mounting the pull rod is oriented away from the insertion direction of the base. That is, the pull rod is installed radially on the mounting groove of the base. With this setting, when connecting the tension spring, the tension spring can be pulled out of the base first, then inserted into the pull rod, and then the pull rod can be positioned so that the pull rod is inserted radially into the mounting groove, thereby facilitating the installation of the tension spring.
[0030] 8. The door lock provided by the present invention, by offsetting the first slide groove, allows the door hook to be inserted into the door lock and cooperate with the cam. As the cam slides along the direction of the first slide groove, the locking effect of the cam on the door hook is improved, that is, the door hook is inserted into the cam more deeply, thus preventing the door hook from coming off.
[0031] 9. The door lock provided by the present invention has an opening at one end of the first slide groove, which facilitates the installation and removal of the cam, thereby providing convenience for the assembly of the door lock and the replacement of the cam.
[0032] 10. The door lock provided by the present invention, through the symmetrical arrangement of two extension arms, can be more stable when limiting the rotation of the cam.
[0033] 11. The door lock provided by the present invention, through the setting of the contact switch, can be used to monitor the engagement state of the cam and the door hook. Specifically, when the cam is driven to rotate by the door hook, the limiting rod slides in the second section of the second slide groove. At this time, the limiting rod contacts the contact switch, and the contact switch is in the open state. When the cam rotates to the position and is driven to move by the door hook, the limiting rod slides in the first section of the second slide groove. The limiting rod releases its contact with the release switch, and the contact switch is in the connected state, thereby determining that the door hook is locked by the cam.
[0034] 12. The electrical appliance provided by the present invention has advantages because it uses the above-mentioned door lock. Attached Figure Description
[0035] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0036] Figure 1 A perspective view of a specific embodiment of the door lock provided in the embodiments of the present invention;
[0037] Figure 2 for Figure 1 3D view of the cam assembly;
[0038] Figure 3 for Figure 1 A three-dimensional view of the central base from an upward angle;
[0039] Figure 4 for Figure 1 Side sectional view;
[0040] Figure 5 for Figure 1 A 3D view of the door lock from the other side.
[0041] Explanation of reference numerals in the attached figures:
[0042] 1. Base; 2. Socket; 3. Cam; 4. Bayonet; 5. First slide groove; 6. Extension arm; 7. Limiting rod; 8. Second slide groove; 9. First section; 10. Second section; 11. Elastic element; 12. Mounting groove; 13. Pull rod; 14. Contact switch; 15. Rotating shaft. Detailed Implementation
[0043] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0044] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0045] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.
[0046] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
[0047] like Figure 1 , Figure 2 As shown, this embodiment provides a specific implementation of a door lock, including: a base 1, the base 1 having a socket 2, in use, a door hook is inserted into the socket 2 of the base 1 to lock the door hook. A cam 3 is rotatably disposed within the base 1, the cam 3 having a latch 4 for inserting the door hook, that is, after the door hook is inserted into the socket 2 of the base 1, it is locked by cooperating with the latch 4 of the cam 3; specifically, the cam 3 locks the door hook by rotating and sliding within the base 1.
[0048] like Figure 3 As shown, in the door lock provided in this embodiment, the base 1 has a first slide groove 5 extending in a direction away from the socket 2, and the rotating shaft 15 of the cam 3 is slidably disposed in the first slide groove 5; that is, when the door hook cooperates with the cam 3, the rotating shaft 15 of the cam 3 rotates and slides in the first slide groove 5 of the base 1.
[0049] like Figure 1 , 2 As shown, an extension arm 6 is connected to the cam 3. The extension arm 6 extends outward along the radial direction of the rotation axis 15 of the cam 3. A limiting rod 7 is connected to the extension arm 6, and the limiting rod 7 is parallel to the rotation axis 15 of the cam 3. The base 1 has a second sliding groove 8 for inserting the limiting rod 7. The first section 9 of the second sliding groove 8 extends away from the insertion port 2 of the base 1, and the second section 10 of the second sliding groove 8 extends away from the bayonet 4 of the cam 3. With this configuration, when the limiting rod 7 is in the second section 10 of the second sliding groove 8, the cam 3 can only rotate; when the limiting rod 7 is in the first section 9 of the second sliding groove 8, the cam 3 can only slide. By setting the limiting rod 7 and the second sliding groove 8 that cooperates with it, the timing of the rotation and sliding of the cam 3 can be restricted. When the door hook is inserted into the cam 3, the cam 3 rotates first and then slides; when the door hook is pulled out, the cam 3 slides first and then rotates. With this configuration, when the door panel is lifted outward a certain distance, the cam 3 can still lock the door hook, and with the help of the elastic element 11, the door panel can be closed automatically.
[0050] like Figure 1 , Figure 2As shown, the cam 3 is connected to an elastic element 11, which has an elastic force that moves the limiting rod 7 on the extension arm 6 to the end of the first segment 9 or the second segment 10 of the second slide groove 8 and holds it in that position. In this embodiment, when the door lock is engaged with the door hook, the cam 3 slides and rotates within the first slide groove 5 of the base 1. Simultaneously, the extension arm 6 connected to the cam 3 drives the limiting rod 7 to slide within the second slide groove 8 of the base 1. Specifically, when the door hook is not inserted, the limiting rod 7 is located at the end of the second segment 10 of the second slide groove 8 and is held in that position by the elastic element 11. When the door hook is inserted, the cam 3 is first driven to rotate. During this process, the limiting rod 7 overcomes the elastic force of the elastic element 11 and slides from the end of the second segment 10 of the second slide groove 8 toward the first segment 9. When the cam 3 rotates to the angle for locking the door hook... The limiting rod 7 reaches between the second section 10 and the first section 9 of the second slide groove 8, and then the door hook continues to be inserted. The cam 3 slides along the first slide groove 5, and the limiting rod 7 slides along the first section 9 of the second slide groove 8. Finally, the door hook is locked in the locked position. During this process, when the limiting rod 7 slides in the first section 9 of the second slide groove 8, the elastic element 11 provides an elastic force that moves the cam 3 toward the locked position. After the door hook moves into place, the cam 3 is held in the locked position. The force of the elastic element 11 in this structure is the same as the expected force after the door is locked, thereby solving the security problem of existing door locks.
[0051] like Figure 2 As shown, in the door lock provided in this embodiment, the extension line of the extension arm 6 is arc-shaped, and the center of the arc of the extension arm 6 is located on the side close to the cam 3. By setting the extension arm 6 to an arc shape, the lifespan of the extension arm 6 during long-term use can be increased, allowing the extension arm 6 to withstand more reverse pulling force towards the arc-shaped back side. In addition, in some alternative embodiments, the extension arm 6 can also be a straight rod, which is not limiting.
[0052] like Figure 2As shown, in the door lock provided in this embodiment, the first segment 9 of the second slide groove 8 is parallel to the first slide groove 5, and the second segment 10 of the second slide groove 8 is arc-shaped, with the center of the arc of the second segment 10 coinciding with the rotation axis 15 of the cam 3. The second slide groove 8 is used to restrict the movement path of the limiting rod 7. When the cam 3 rotates, it drives the limiting rod 7 to move along the second segment 10 of the second slide groove 8. When the cam 3 moves, it drives the limiting rod 7 to move along the first segment 9 of the second slide groove 8. At the same time, the first segment 9 of the second slide groove 8 is also used to restrict the rotation of the cam 3. When the limiting rod 7 moves within the first segment 9 of the second slide groove 8, the cam 3 is kept at the angle for locking the door hook. In addition, in some alternative embodiments, the width of the second slide groove 8 can be made slightly wider, thereby allowing the limiting rod 7 to have a certain range of movement within the second slide groove 8. With this setting, the center of the arc of the second segment 10 of the second slide groove 8 does not need to be restricted.
[0053] like Figure 2 As shown, in the door lock provided in this embodiment, the second segment 10 of the second slide groove 8 extends toward the insertion port 2 away from the base 1; in other words, as the second segment 10 of the second slide groove 8 extends toward the end, it gradually moves away from the opening direction of the insertion port 2 of the base 1. By setting the second segment 10 of the second slide groove 8 to extend toward the insertion port 2 away from the base 1, the process of the limiting rod 7 sliding toward the end within the second segment 10 of the second slide groove 8 can better cooperate with the elastic member 11, allowing the elastic member 11 to better hold the limiting rod 7 at the end position of the second segment 10. In addition, in some alternative embodiments, the second segment 10 of the second slide groove 8 can also extend horizontally toward a direction perpendicular to the opening direction of the insertion port 2.
[0054] like Figure 2 As shown, in the door lock provided in this embodiment, the elastic element 11 is a tension spring, the limiting rod 7 is detachably connected to the extension arm 6, one end of the elastic element 11 is connected to the limiting rod 7, and the other end of the elastic element 11 is detachably connected to the base 1. By setting the elastic element 11 as a tension spring, it has a larger elastic force stroke on the limiting rod 7. By making the elastic element 11 detachable, it is easy to replace the elastic element 11. In addition, as an alternative implementation, the elastic element 11 can also be other elastic elements 11 besides the tension spring, such as a coil spring.
[0055] like Figure 2As shown, in the door lock provided in this embodiment, the base 1 is provided with a mounting groove 12, the mounting groove 12 has an opening, and a pull rod 13 is detachably mounted on the mounting groove 12 from the opening. The pull rod 13 is parallel to the rotating shaft 15, and the other end of the elastic element 11 is connected to the pull rod 13. The mounting groove 12 on the base 1 is used to detachably mount the pull rod 13, and the pull rod 13 is used to connect the other end of the elastic element 11, thereby realizing the detachability of the elastic element 11. In addition, in some alternative embodiments, the base 1 can also adopt other structures for connecting the elastic element 11, such as providing a hook for hooking the elastic element 11.
[0056] like Figure 1-4 As shown, in the door lock provided in this embodiment, the mounting groove 12 opens towards the insertion port 2 away from the base 1. The opening of the mounting groove 12 on the base 1 for mounting the pull rod 13 faces away from the insertion port 2 of the base 1. That is, the pull rod 13 is installed radially in the mounting groove 12 of the base 1. With this arrangement, when connecting the tension spring, the tension spring can be pulled out of the base 1 first, then inserted into the pull rod 13, and then the pull rod 13 can be positioned so that it radially engages with the mounting groove 12, thus facilitating the installation of the tension spring. Alternatively, in some alternative embodiments, the mounting groove 12 can also be a closed perforated structure, etc.
[0057] like Figure 4 As shown, in the door lock provided in this embodiment, as the first slide groove 5 extends away from the socket, it also shifts away from the second segment 10 of the second slide groove 8. By shifting the first slide groove 5, the door hook is inserted into the door lock and engages with the cam 3. As the cam 3 slides along the direction of the first slide groove 5, the locking effect of the cam 3 on the door hook is improved, that is, the door hook is inserted deeper into the cam 3, preventing the door hook from disengaging. Alternatively, in some alternative embodiments, the first slide groove 5 may not be shifted; for example, it may be configured to be parallel to the opening direction of the socket.
[0058] like Figure 3 , Figure 4 As shown, in the door lock provided in this embodiment, the end of the first slide groove 5 away from the insertion port 2 of the base 1 has an opening. By setting one end of the first slide groove 5 to have an opening, the installation and removal of the cam 3 can be facilitated, thereby providing convenience for the assembly of the door lock and the replacement of the cam 3. In addition, in some alternative embodiments, the opening can be sealed and then opened during installation and removal. Alternatively, the base 1 can be set as a separable two-half structure, in which case the opening can be omitted.
[0059] like Figure 2As shown, in the door lock provided in this embodiment, there are two extension arms 6, which are symmetrically connected to both sides of the cam 3. The symmetrical arrangement of the two extension arms 6 provides greater stability when limiting the rotation of the cam 3. Alternatively, in some alternative embodiments, only one extension arm 6 may be provided to save space.
[0060] like Figure 5 As shown, the door lock provided in this embodiment further includes a contact switch 14, which is mounted on the base 1. One end of the limiting rod 7 extends out of the base 1. The limiting rod 7 contacts the contact switch 14 during the sliding process of the second section 10 of the second slide groove 8, and also contacts the contact switch 14 during the sliding process of the first section 9 of the second slide groove 8. The contact switch 14 can be used to monitor the engagement state between the cam 3 and the door hook. Specifically, when the cam 3 is driven to rotate by the door hook, the limiting rod 7 slides within the second section 10 of the second slide groove 8, at which point the limiting rod 7 contacts the contact switch 14, and the contact switch 14 is in an open state. When the cam 3 rotates to its position and is driven to move by the door hook, the limiting rod 7 slides within the first section 9 of the second slide groove 8, releasing its contact with the release switch, and the contact switch 14 is in a connected state, thus indicating that the door hook is locked by the cam 3. In some alternative embodiments, the contact switch 14 can be omitted.
[0061] In addition, this embodiment also provides an electrical appliance, including the door lock described in the above embodiments. Specifically, the electrical appliance can be a dryer, dishwasher, or other household appliances.
[0062] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.
Claims
1. A door lock, characterized in that, include: The base (1) has a socket (2) for inserting a door hook; A cam (3) is rotatably disposed within the base (1), and the cam (3) has a slot (4) for inserting the door hook; the base (1) has a first groove (5) extending in a direction away from the slot (2), and the pivot (15) of the cam (3) is slidably disposed within the first groove (5); An extension arm (6) is connected to the cam (3). The extension arm (6) extends outward in the radial direction along the rotation axis (15) of the cam (3). A limit rod (7) is connected to the extension arm (6). The limit rod (7) is parallel to the rotation axis (15) of the cam (3). The base (1) has a second groove (8) for inserting the limit rod (7). The first section (9) of the second groove (8) extends toward the insertion port (2) away from the base (1). The second section (10) of the second groove (8) extends toward the bayonet (4) away from the cam (3). An elastic element (11) is connected to the cam (3). The elastic element (11) has an elastic force that moves the limiting rod (7) on the extension arm (6) to the end of the first segment (9) of the second slide groove (8) and holds it in that position, and an elastic force that moves the limiting rod (7) on the extension arm (6) to the end of the second segment (10) of the second slide groove (8) and holds it in that position. The elastic element (11) is a tension spring. The limiting rod (7) is detachably connected to the extension arm (6). One end of the elastic element (11) is connected to the limiting rod (7), and the other end of the elastic element (11) is detachably connected to the base (1). The extension line of the extension arm (6) is arc-shaped, and the center of the arc of the extension line of the extension arm (6) is located on the side close to the cam (3); the first segment (9) of the second slide groove (8) is parallel to the first slide groove (5), the second segment (10) of the second slide groove (8) is arc-shaped, the center of the arc of the second segment (10) coincides with the pivot (15) of the cam (3), and the second segment (10) of the second slide groove (8) extends toward the insertion port (2) away from the base (1).
2. The door lock according to claim 1, characterized in that, The base (1) is provided with a mounting groove (12) with an opening. A pull rod (13) is detachably mounted on the mounting groove (12) from the opening. The pull rod (13) is parallel to the rotating shaft (15). The other end of the elastic element (11) is connected to the pull rod (13).
3. The door lock according to claim 2, characterized in that, The mounting groove (12) is opened toward the insertion port (2) away from the base (1).
4. The door lock according to claim 1, characterized in that, As the first groove (5) extends toward the direction away from the socket, it also shifts toward the second segment (10) away from the second groove (8).
5. The door lock according to claim 1, characterized in that, The first groove (5) has an opening at one end away from the socket (2) of the base (1).
6. The door lock according to claim 1, characterized in that, There are two extension arms (6), which are symmetrically connected to both sides of the cam (3).
7. The door lock according to any one of claims 1-6, characterized in that, Also includes: A contact switch (14) is installed on the base (1). One end of the limiting rod (7) extends out of the base (1). The limiting rod (7) contacts the contact switch (14) during the sliding process of the second section (10) of the second slide groove (8). The limiting rod (7) contacts the contact switch (14) during the sliding process of the first section (9) of the second slide groove (8).
8. An electrical appliance, characterized in that, The door lock includes any one of claims 1-7.