CN115263096A

CN115263096A - Door lock for household appliance

Info

Publication number: CN115263096A
Application number: CN202210822609.1A
Authority: CN
Inventors: 王霖铁; 任少江; 张艳
Original assignee: Hanle Electronic Machinery Nanjing Co ltd
Current assignee: Hanle Electronic Machinery Nanjing Co ltd
Priority date: 2022-07-13
Filing date: 2022-07-13
Publication date: 2022-11-01
Anticipated expiration: 2042-07-13
Also published as: CN115263096B

Abstract

The invention discloses a door lock for a household appliance, which comprises a bottom shell, a latch arm, a conversion block, a locking block, a second elastic element and a third elastic element. One end of the latch arm is a head end of the latch arm, and the other end of the latch arm is a tail end of the latch arm. The conversion block is arranged on the bottom shell through a shaft, one end of the conversion block is provided with a first convex surface, and the other end of the conversion block is provided with a second convex surface; the tail end of the latch arm is provided with a guide inclined plane, and the first convex surface is contacted with the guide inclined plane under the pressure of the second elastic element; the locking mechanism comprises a locking block and a third elastic element, a locking protrusion is arranged on the locking block, and when the second convex surface contacts with the upper surface of the locking protrusion, the door lock achieves a locking function. The door lock disclosed by the invention has the advantages of simple structure and high reliability, can realize strong door opening under the condition of locking the door lock, cannot damage the door lock, and can be locked again when needed. Can be widely applied to household appliances such as dish washers, washing machines, refrigerators and the like.

Description

Door lock for household appliance

Technical Field

The invention belongs to the technical field of household appliance door locks, and particularly relates to a door lock for a household appliance.

Background

In the working process of household appliances such as dish washing machines, washing machines and the like, door closing and locking are generally realized by adopting a mode of matching a door latch and a door lock. The door catch and the door lock are respectively installed on the door and the main body of the household appliance. The door lock has a latch arm, and during the door opening process, the latch arm is overcome the elasticity that receives, makes its and the hasp separation, and the door is opened. In the door closing process, the latch arm and the door catch move relatively, and finally the door catch is pressed under the action of the elastic force, so that the door closing effect is achieved. A locking mechanism is also typically employed to achieve the locking effect.

With the continuous improvement of living standard, the requirement of users on the door lock function of the household appliance is higher and higher. For example, sometimes, a user needs to forcibly open the door lock without destroying the structure of the door lock and to be able to normally close the door. However, the purpose of locking is to prevent the door from being opened by an external force when locked, which is contrary to the above-mentioned demand, and the door lock for the household appliance at present does not meet the above-mentioned demand of the user.

Disclosure of Invention

The invention aims to provide a door lock for household appliances, which can be used for forcibly opening the door lock without damaging the structure of the door lock and normally closing the door.

In order to realize the purpose of the invention, the invention adopts the following technical scheme:

a door lock for a home appliance includes a bottom case, a latch arm, and a locking mechanism; one end of the latch arm, which is used for being matched with the door catch, is a head end of the latch arm, and the other end of the latch arm is a tail end of the latch arm. The locking mechanism comprises a conversion block, a locking block, a second elastic element and a third elastic element; the conversion block is installed on the bottom shell through a shaft, one end of the conversion block is provided with a first convex surface, and the other end of the conversion block is provided with a second convex surface. The tail end of the latch arm is provided with a guide inclined surface, and the first convex surface is contacted with the guide inclined surface under the pressure of the second elastic element. The locking block is provided with a locking protrusion, and when the second convex surface contacts with the upper surface of the locking protrusion, the door lock for the household appliance realizes the locking function. A door lock for a home appliance is provided,

when the lock is regular, when the user forcefully opens the lock, first latch arm head end and second latch arm head end deviate from, first latch arm tail end and second latch arm tail end are close to mutually, the guide inclined plane extrusion first convex surface, first convex surface lifting, the second convex surface pushes down the locking is protruding, the locking piece moves to the outside, and compresses third elastic element, the second convex surface is followed the protruding outline downstream of locking, with the protruding lower surface contact of locking, third elastic element no longer is compressed by the locking piece, and the lock is opened this moment to because third elastic element has elasticity, the forcefully opened door can not cause the harm to the lock.

Further, the latch arm comprises a first latch arm and a second latch arm, and the first latch arm and the second latch arm are symmetrically hinged on the bottom shell. The first latch arm and the second latch arm are used for being respectively a first latch arm head end and a second latch arm head end with one end matched with a door buckle, the other ends of the first latch arm and the second latch arm are respectively a first latch arm tail end and a second latch arm tail end, and the first latch arm head end and the second latch arm head end are connected through the first elastic element. The first latch arm tail end and/or the second latch arm tail end is/are provided with a guide inclined surface, and the first convex surface is in contact with the guide inclined surface under the pressure of the second elastic element.

Furthermore, the locking mechanism further comprises a stop block, the stop block is located on the outer side of the locking block, and the stop block is connected with the third elastic element.

Further, the stopper includes a baffle plate and a connecting portion, the baffle plate contacting the locking block; one end of the third elastic element is fixed on the bottom shell, and the other end of the third elastic element is located in the connecting part.

Still further, the connecting portion is provided with a limiting protrusion, the bottom shell is provided with a sliding groove and a limiting groove, the connecting portion slides in the sliding groove, and the limiting protrusion slides in the limiting groove.

Further, the locking mechanism further comprises a driving mechanism, and the locking block moves along a direction perpendicular to the symmetry axes of the first latch arm and the second latch arm or a direction forming a certain angle with the symmetry axes of the first latch arm and the second latch arm under the driving of the driving element.

Furthermore, the locking mechanism further comprises a position switch, a positioning protrusion is arranged on the locking block, and the position switch is used for detecting the position of the positioning protrusion.

In another improvement, the first elastic element is a spring, and comprises a torsion spring, a tension spring or a compression spring.

Further, the second elastic element is a spring, and comprises a pressure spring, a torsion spring and a tension spring; the conversion block is provided with a spring mounting structure, and the spring is mounted in the spring mounting structure.

Furthermore, the third elastic element is a spring, and comprises a pressure spring, a tension spring or a torsion spring. By changing the pressure value of the spring, the force value for the user to forcibly open the door lock can be set.

The invention discloses a door lock for household appliances, which can realize strong door opening under the condition of locking the door lock; after the door is opened by a strong force, the door can be normally opened and closed, the requirement of a customer for opening the door by a strong force in the process of using the household appliance is met, meanwhile, the door lock cannot be damaged, and the door can be locked again when needed. The door lock for the household appliance has the advantages of simple structure and high reliability, improves the use experience of users, and can be widely applied to household appliances such as dish washing machines, refrigerators and the like.

Drawings

Fig. 1 is a schematic view of an overall structure of a door lock for a home appliance according to the present invention;

FIG. 2 is a schematic illustration of the latch arm construction of the present invention;

FIG. 3 is a perspective view of the latch arm shown in FIG. 2;

FIG. 4 is a schematic diagram of a conversion block of the present invention;

FIG. 5 is a right side view of the transition block of FIG. 4;

FIG. 6 is a perspective view of the transition block shown in FIG. 4;

FIG. 7 is a perspective view of the latch block construction of the present invention;

FIG. 8 is a partial plan view of the latch block of FIG. 7;

FIG. 9 is a perspective view of the stop of the present invention;

FIG. 10 is a schematic view illustrating a door lock for a home appliance in an unlocked state according to an embodiment of the present invention;

FIG. 11 is a side view of the state shown in FIG. 10;

FIG. 12 is a schematic view illustrating an unlocked state of a door lock for a home appliance according to an embodiment of the present invention;

FIG. 13 is a side view of the state shown in FIG. 12;

FIG. 14 is a schematic diagram illustrating a door locked and unlocked state of a door lock for a household appliance according to an embodiment of the present invention;

FIG. 15 is a side view of the state shown in FIG. 14;

FIG. 16 is a schematic diagram illustrating a door lock for a household appliance in a locked and forced state according to an embodiment of the present invention;

FIG. 17 is a side view of the state shown in FIG. 16;

FIG. 18 is a schematic view of the change in position of the shift block relative to the lockout block during the hard pull of FIG. 16.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings. In the description of the present invention, it is to be understood that the terms "left side", "right side", "upper", "lower", "bottom", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, "first", "second", etc., do not represent an important degree of the component parts, and thus are not to be construed as limiting the present invention. The specific dimensions and values used in the present embodiment are only for illustrating the technical solutions, and do not limit the protection scope of the present invention. The following embodiments are all exemplified by using the safety door lock of the present invention in a dishwasher, but it should be noted that the safety door lock of the present invention is not limited to be applied to a dishwasher.

As shown in fig. 1, a door lock for a home appliance includes a bottom case 1, a first latch arm 2, a second latch arm 4, a first elastic member 5, a second elastic member 14, and a locking mechanism including a conversion block 13. The first latch arm 2 and the second latch arm 4 are symmetrically hinged on the bottom case 1, as shown in fig. 2, one end of the first latch arm 2 and the other end of the second latch arm 4 for cooperating with the door latch are a first latch arm head end 21 and a second latch arm head end 41 respectively, the other end is a first latch arm tail end 22 and a second latch arm tail end 42 respectively, and the first latch arm head end 21 and the second latch arm head end 41 are connected through a first elastic element 5. The conversion block 13 is mounted on the bottom case 1 through the shaft 6, and as shown in fig. 4 to 6, the conversion block 13 has a first convex surface 131 at one end and a second convex surface 132 at the other end. As shown in fig. 2 and 3, the first latch arm tail end 22 or the second latch arm tail end 42 has the guiding inclined surface 15, the first convex surface 131 contacts with the guiding inclined surface 15 under the pressure of the second elastic element 14, and the first latch arm tail end 22 and the second latch arm tail end 42 both have the guiding inclined surface 15, which improves the stability of the door lock and the strong door opening effect. The locking mechanism further comprises a locking block 8, as shown in fig. 7 and 8, on which a locking protrusion 81 is provided, and a third elastic element 10, and an upper surface 811 of the locking protrusion 81 contacts the second convex surface 132 under the elastic force of the third elastic element 10. Generally, the surfaces of the first convex surface 131 and the second convex surface 132 have a certain curvature, the guiding inclined surface 15 may be a plane or a curve, and the first convex surface 131 and the guiding inclined surface may be in surface contact or line contact, or in extreme cases, in point contact. The surface of the locking projection 81 is generally a smoothly transitioning curved surface, and in particular, the upper surface 811 is a continuous smoothly curved surface.

As shown in fig. 10 and 11, when the door lock is in the unlocked state with the door opened, the first latch arm 2 and the second latch arm 4 are not caught by the door catch 3. At this time, the lock block 8 is not in contact with the conversion block 13. As shown in fig. 12 and 13, when the door lock is in the closed but unlocked state, the first latch arm 2 and the second latch arm 4 are latched to the door latch 3, and the lock block 8 is not in contact with the switching block 13. As shown in fig. 14 and 15, when the door lock is closed and about to be locked, the first latch arm 2 and the second latch arm 4 are buckled on the door catch 3, and at this time, the locking block 8 is positioned to contact with the conversion block under the action of the driving mechanism 7, the locking block 8 limits the rotation of the conversion block 13, the conversion block 13 limits the rotation of the first latch arm 2 and the second latch arm 4, and the user cannot open the door by using normal force.

As shown in fig. 16 to 18, when the user forcibly opens the door lock in the locked state of the door lock, the first latch arm head 21 and the second latch arm head 41 are separated from each other, the first latch arm tail end 22 and the second latch arm tail end 42 are close to each other, the guide slope 15 presses the first convex surface 131, the first convex surface is raised 131, and the second convex surface 132 presses the locking protrusion 81. Under the interaction of the second convex surface 132 and the locking protrusion upper surface 811, the locking block 8 and the stopper 9 are forced to move outwards and compress the third elastic element 10, the second convex surface 132 moves downwards along the outer contour of the locking protrusion 81 and contacts with the locking protrusion lower surface 812, at this time, the third elastic element 10 is no longer compressed by the locking block 8 and returns the stopper 9 to the initial position, at this time, the door lock is opened, and because the third elastic element 10 has elasticity, the strong door opening cannot damage the door lock. After the door lock is opened strongly, the second convex surface 132 is located at the lower surface 812 of the locking protrusion and is limited by the locking protrusion 81, the conversion block 13 cannot return to the original position, at this time, although the locking block 8 of the door lock is in the locking position, the conversion block 13 does not move synchronously with the opening and the departing of the first latch arm 2 and the second latch arm 4, and the conversion block 13 is always in a position not contacting with the first latch arm 2 and the second latch arm 4. The first latch arm and the second latch arm are not limited by the conversion block, and the door can still be normally opened and closed.

Preferably, as shown in fig. 1, the locking mechanism further comprises a stopper 9, and the stopper 9 is positioned outside the locking block. As shown in fig. 9, the stopper 9 includes a shutter 91 and a connecting portion 92, the shutter 91 being in contact with the lock block 8; as shown in fig. 1, one end of the third elastic element 10 is fixed on the bottom case 1, and the other end is located in the connecting portion 92.

As shown in fig. 1, the connecting portion 92 is provided with a limiting protrusion 93, the bottom case 1 is provided with a sliding groove 11 and a limiting groove 12, the connecting portion 92 slides in the sliding groove 11, and the limiting protrusion 93 slides in the limiting groove 12.

The locking mechanism further comprises a drive mechanism 7, and the locking block 8 is moved by the drive mechanism 7 in a direction perpendicular or at an angle to the axis of symmetry of the first and second latch arms 2, 4. The locking mechanism also comprises a locking switch, and the existing household appliances with doors are generally provided with the locking switch, and can be in an automatic mode or a manual mode. The locking switch is used for sending a driving signal to the driving mechanism, and the driving mechanism 7 can act and change the position of the locking block 8 after receiving the signal. As shown in fig. 1, the locking mechanism further includes a position switch; as shown in fig. 7, the locking block 8 is provided with a positioning protrusion 82, and the position switch is used to detect the position of the positioning protrusion, so as to determine whether the door lock is in a locked state.

In this embodiment, the first elastic element is generally a tension spring or a compression spring, and may also be a torsion spring, which can achieve the effect of pulling the first latch arm and the second latch arm closer. The second elastic element adopts a torsion spring, and can also adopt a tension spring or a pressure spring, so that the conversion block is pressed on the latch arm; in this embodiment, a torsion spring groove 133 is formed at the mounting hole of the conversion block, and the torsion spring is mounted in the torsion spring groove 133. The third elastic element has a better effect of adopting a pressure spring, and can also adopt a torsion spring or a tension spring, and the magnitude of force for forcefully opening the door lock can be limited by setting the elasticity of the pressure spring.

Based on the description of the preferred embodiments of the present invention, it should be clear that the invention as defined by the appended claims is not limited to the specific details set forth in the above description, but that many obvious modifications thereof are possible without departing from the spirit or scope thereof.

Claims

1. A door lock for a home appliance includes a bottom case, a latch arm, and a locking mechanism; one end of the latch arm, which is used for being matched with the door catch, is a head end of the latch arm, and the other end of the latch arm is a tail end of the latch arm; the locking mechanism is characterized by comprising a conversion block, a locking block, a second elastic element and a third elastic element; the conversion block is arranged on the bottom shell through a shaft, one end of the conversion block is provided with a first convex surface, and the other end of the conversion block is provided with a second convex surface; the tail end of the latch arm is provided with a guide inclined surface, and the first convex surface is contacted with the guide inclined surface under the pressure of a second elastic element; the locking block is provided with a locking protrusion, and when the second convex surface contacts with the upper surface of the locking protrusion, the door lock for the household appliance realizes a locking function.

2. The door lock for electric household appliances according to claim 1, characterized in that the latch arm comprises a first latch arm and a second latch arm, symmetrically hinged on the bottom shell; one ends of the first latch arm and the second latch arm, which are used for being matched with the door buckle, are respectively a first latch arm head end and a second latch arm head end, the other ends of the first latch arm and the second latch arm are respectively a first latch arm tail end and a second latch arm tail end, and the first latch arm head end and the second latch arm head end are connected through the first elastic element; the first latch arm tail end and/or the second latch arm tail end is/are provided with a guide inclined surface, and the first convex surface is in contact with the guide inclined surface under the pressure of the second elastic element.

3. The door lock for electric household appliances according to claim 1, characterized in that the locking mechanism further comprises a stopper located outside the locking block, the stopper being connected with the third elastic element.

4. The door lock for electric home appliances according to claim 3, wherein the stopper includes a blocking plate and a connection portion, the blocking plate being in contact with the locking block; one end of the third elastic element is fixed on the bottom shell, and the other end of the third elastic element is located in the connecting part.

5. The door lock for home appliances according to claim 4, wherein the connecting part is provided with a limit projection, the bottom case is provided with a sliding groove and a limit groove, the connecting part slides in the sliding groove, and the limit projection slides in the limit groove.

6. The door lock for electric home appliances according to claim 1, wherein the locking mechanism further comprises a driving mechanism, and the locking block is moved in a direction perpendicular to the symmetry axes of the first and second latch arms or in a direction at an angle to the symmetry axes of the first and second latch arms by the driving element.

7. The door lock for home appliances according to claim 6, wherein the locking mechanism further comprises a position switch, a positioning protrusion is provided on the locking block, and the position switch is used for detecting the position of the positioning protrusion.

8. The door lock for home appliances according to any one of claims 1 to 7, wherein the first elastic member employs a spring, including a torsion spring, a tension spring, or a compression spring.

9. The door lock for home appliances according to any one of claims 1 to 7, wherein the second elastic member is a spring including a compression spring, a torsion spring, a tension spring; the conversion block is provided with a spring mounting structure, and the spring is mounted in the spring mounting structure.

10. The door lock for electric home appliances according to any one of claims 1 to 7, wherein the third elastic member is a spring, includes a compression spring, a tension spring, or a torsion spring.