A door opening and closing device with child lock function

Abstract

A child-locking door opening and closing device includes a main body and a trigger hinged thereon. The main body has a receiving groove, within which a pull rod is installed. The pull rod is hinged to the trigger. A tension spring is also provided in the receiving groove and connected to the pull rod. The device is characterized by a spring-loaded guide wheel frame within the main body. One end of the guide wheel frame has a guide wheel that contacts the outer contour of the trigger. An electric mechanism drives the guide wheel frame to move via the spring. The advantages of this invention are: the trigger has an inwardly recessed locking groove on its outer contour. After the door is closed, the electric mechanism, via the spring, pushes the guide wheel into the locking groove, locking the trigger and preventing children from accidentally opening the door and causing burns. Furthermore, the electric mechanism can meet the locking force requirements of other products, improving product safety and highlighting automation and powerful performance.

Description

Technical Field

[0001] This invention relates to a hardware accessory, specifically a door opening and closing device with a child lock function. Background Technology

[0002] With rapid social development, people's quality of life has continuously improved, especially their attention to food. Making meals at home has become a habit for many, leading to the proliferation of various appliances such as ovens and microwaves. The doors of these appliances are hinged to the main unit via a hinged opening and closing mechanism. As is well known, ovens and microwaves generate a large amount of heat during operation, requiring a tight seal on the door. Otherwise, heat leakage will occur, resulting in low thermal efficiency and wasted resources. Furthermore, because these door mechanisms lack a locking function when closed, children could accidentally open the door during operation, posing a safety hazard due to hot steam. The current spring-loaded locking mechanism has shortcomings and therefore requires further improvement. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a door opening and closing device with a child lock function that is simple in structure, easy to use, and capable of double automatic locking after being closed.

[0004] The objective of this invention is achieved in the following manner: a child lock door opening and closing device, comprising a main body and a trigger hinged thereon, a receiving groove provided in the main body, a pull rod installed in the receiving groove, the pull rod being hinged to the trigger, a tension spring also provided in the receiving groove, the tension spring being connected to the pull rod, and a guide wheel frame with a spring also provided in the main body, one end of the guide wheel frame being fitted with a guide wheel that contacts the outer contour of the trigger, and an electric mechanism driving the guide wheel frame to move via the spring.

[0005] The trigger has an inwardly recessed locking groove on its outer contour, and the electric mechanism pushes the guide wheel into the locking groove by a spring.

[0006] The electric mechanism includes a screw driven by a geared motor. The screw is screwed to a nut on a pressure plate. The guide hole is provided on the pressure plate. When the screw rotates, it pushes the pressure plate, forcing the spring to compress and causing the guide wheel frame to move relative to the plate.

[0007] The spring is fitted onto the surface of the guide wheel frame, with one end pressing against the pressure plate and the other end pressing against the guide wheel seat of the guide wheel frame.

[0008] A connecting plate is also fixedly installed inside the receiving groove, and the electric mechanism is fixed inside the connecting plate.

[0009] The guide wheel is mounted on the guide wheel seat via a guide wheel shaft, and the two ends of the guide wheel shaft extend outward and slide into the guide wheel groove on the main body.

[0010] The pressure plate end face is provided with a guide hole, and one end of the guide wheel frame is placed in the guide hole.

[0011] The beneficial effects of this invention are: 1. Simple structure, low production cost, and improved market competitiveness. 2. The outer contour of the trigger is provided with an inwardly recessed locking groove. After the door closing device is closed, the electric mechanism pushes the guide wheel through the spring to lock it in the locking groove, thereby locking the trigger and preventing children from accidentally opening the door and causing burns. Furthermore, the electric mechanism can meet the locking force requirements of other products, improving product safety and highlighting automation and powerful performance. 3. By pushing the trigger a second time through the electric mechanism, the door is double-locked. 4. By using a guide wheel frame with a spring, multiple forces can be achieved, thereby adapting to the need to automatically adjust the force due to product manufacturing errors or other factors to improve the closing force and sealing. Attached Figure Description

[0012] Figure 1 , 2 This is a rendering of the final assembly of the invention.

[0013] Figure 3 This is an assembly diagram of the structure of the present invention.

[0014] Figure 4 In this invention Figure 3 Enlarged view of the structure of part A.

[0015] Figure 5 This is a partial cross-sectional view of the structure of the present invention.

[0016] Figure 6 This is a schematic diagram of the electric mechanism in this invention. Detailed Implementation

[0017] The invention will be further described in detail below with reference to the accompanying drawings. A child lock door opening and closing device includes a main body 1 and a trigger 2 movably hinged thereon. The main body 1 has a receiving groove 3, and a pull rod 4 is installed in the receiving groove 3. The pull rod 4 is movably hinged to the trigger 2. The receiving groove 3 also has a tension spring 7, which is connected to the pull rod 4. The main body 1 also has a guide wheel frame 8 with a spring 9. One end of the guide wheel frame 8 is equipped with a guide wheel 81 that contacts the outer contour of the trigger 2. An electric mechanism drives the guide wheel frame 8 to move through the spring 9.

[0018] The trigger 2 has an inwardly recessed locking groove 21 on its outer contour. The electric mechanism pushes the guide wheel 81 through the spring 9 and locks it into the locking groove 21.

[0019] The electric mechanism includes a screw 91 driven by a geared motor 10. The screw 91 is screwed to a nut 94 on a pressure plate 93. The guide hole 82 is provided on the pressure plate 93. When the screw 91 rotates, it pushes the pressure plate 93 to compress the spring 9, causing the guide wheel frame 8 to move relative to it.

[0020] The spring 9 is fitted onto the surface of the guide wheel frame 8, with one end pressing against the pressure plate 93 and the other end pressing against the guide wheel seat 84 of the guide wheel frame.

[0021] A connecting plate 31 is also fixedly installed inside the receiving groove 3, and the electric mechanism is fixed inside the connecting plate 31.

[0022] The guide wheel 81 is mounted on the guide wheel seat 84 via the guide wheel shaft 85, and the two ends of the guide wheel shaft 85 extend outward and slide into the guide wheel groove 86 on the main body 1.

[0023] The pressure plate 93 has a guide hole 82 on its end face, and one end of the guide wheel frame 8 is placed in the guide hole 82.

[0024] Working principle: When the door needs to be opened, the trigger rotates around the main body's pivot, thus opening and closing the door. During the opening process, the position between the trigger and the main body changes, and the trigger stretches the tension spring 7 via the pull bar and pull rod, generating a reset force. When the door needs to be closed, the tension of the tension spring 7 pulls the main body and the trigger to change the angle, thereby achieving the automatic closing and reset function.

[0025] When the closing mechanism is closed, the screw 91 driven by the geared motor 10 rotates. The screw 91 is screwed onto the nut 94 on the pressure plate 93. When the screw 91 rotates, it pushes the pressure plate 93, forcing the spring 9 to compress. This causes the guide wheel frame 8 to move relative to the spring 9, which pushes the guide wheel frame 8 towards the trigger 2. This forces the guide wheel on the guide wheel frame to engage with the locking groove on the trigger, thus locking the trigger. The spring has a certain compression stroke, which reduces the accuracy requirements of the guide wheel frame's movement stroke. This avoids poor locking effect due to insufficient motor stroke, and also avoids deformation of related components or even damage to the geared motor due to excessive motor stroke causing hard compression between the guide wheel and the locking groove. When unlocking is required, the control system controls the geared motor to rotate in the opposite direction, using the screw to pull the guide wheel frame, causing the guide wheel to disengage from the locking groove.

[0026] On the other hand, some products require a secondary locking function for the door, which can be achieved by the electric mechanism continuing to move towards the trigger a second time.

[0027] Compared with traditional technologies, the door closing device in this case can automatically lock when the door is closed, thus effectively ensuring the airtightness of the door when used with products that require doors, such as ovens, microwave ovens, and refrigerators. It also prevents children and other users from accidentally opening the door, ensuring the safety of the equipment. It can adapt to the requirements of different products (including dimensional errors in the product parts) and highlights automation, so it can be widely promoted and used.

[0028] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A child lock door opening and closing device, comprising a main body (1) and a trigger (2) movably hinged thereon, wherein a receiving groove (3) is provided in the main body (1), a pull rod (4) is installed in the receiving groove (3), the pull rod (4) is movably hinged to the trigger (2), and a tension spring (7) is also provided in the receiving groove (3), the tension spring (7) being connected to the pull rod (4), characterized in that: The main body (1) is also provided with a guide wheel frame (8) with a spring (9). One end of the guide wheel frame (8) is equipped with a guide wheel (81) that contacts the outer contour of the trigger (2). The electric mechanism drives the guide wheel frame (8) to move through the spring (9). The trigger (2) has an inwardly recessed locking groove (21) on its outer contour. The electric mechanism pushes the guide wheel (81) to be locked in the locking groove (21) by the spring (9). The electric mechanism includes a screw (91) driven by a geared motor (10), and the screw (91) is screwed to a nut (94) on a pressure plate (93); The pressure plate (93) has a guide hole (82) on its end face. One end of the guide wheel frame (8) is placed in the guide hole (82). When the screw (91) rotates, it pushes the pressure plate (93) to compress the spring (9), causing the guide wheel frame (8) to move relative to the spring. The spring (9) is fitted onto the surface of the guide wheel frame (8), with one end pressing against the pressure plate (93) and the other end pressing against the guide wheel seat (84) of the guide wheel frame; A connecting plate (31) is also fixedly installed inside the receiving groove (3), and the electric mechanism is fixed inside the connecting plate (31); The guide wheel (81) is mounted on the guide wheel seat (84) via the guide wheel shaft (85), and the two ends of the guide wheel shaft (85) extend outward and slide in the guide wheel groove (86) on the main body (1).

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