A single-leaf door hinge

Abstract

A single-leaf door hinge includes a main body installed on a cabinet door and a hinge arm movably hinged to the front end thereof. The hinge arm is snap-fixed to the cabinet body. A pull arm is also hingedly installed on the hinge arm. A sliding arm is also installed in the main body in a front-back sliding manner. The front end of the sliding arm is slidably fixed in a first chute on the main body through a first pin shaft, and the rear end of the sliding arm is slidably fixed in a second chute on the main body through a second pin shaft. A tension spring is arranged between the tail end of the pull arm and the second pin shaft. A guide wheel is installed at the front end of the sliding arm. The guide wheel abuts against the outer edge of the hinge arm and can slide on its surface. A locking groove is also arranged on the hinge arm. When the hinge is in a closed state, the guide wheel falls into the locking groove for fixation. The beneficial effects of the present invention are as follows: Only one spring can be used to achieve the automatic reset closing or door-opening hovering of the hinge and the locking function after closing the door, greatly simplifying the mechanical structure and improving the production and processing efficiency.

Description

Technical Field

[0001] The present invention relates to an oven accessory, specifically a single - spring door hinge. Background Art

[0002] Currently, among all box - type electrical appliances with doors, such as electric ovens and microwave ovens, they have become one of the commonly used household appliances. Electric ovens are convenient and fast to use and are deeply loved by the general public. For example, the Chinese Patent Office announced an invention named: Electric Oven, with a patent number of 00260107.9. Its structure is described as follows: including a box body and a box door. There are at least two guide posts on both end faces of the box body. The groove cross - section of the box door is arc - shaped, with flanges extending radially at both ends. There is a sliding groove on the inner wall of the flange, and there are at least two notches on the sliding groove corresponding to the guide posts of the box body. However, there are two deficiencies: 1. The box door cannot reset itself and depends entirely on manual operation to open or close the box door. 2. The traditional oven has poor sealing performance, so that the oven door cannot tightly press the sealing ring of the oven inner liner. As a result, the heat inside the oven is easily dissipated during operation. While affecting the thermal efficiency of the oven, users are also easily scalded by the leaked hot air, steam, etc., thus failing to achieve the functions of environmental protection and energy conservation well. Therefore, it is necessary to further improve the existing oven hinge structure. Therefore, the applicant proposed a single - spring door hinge in the patent number 201520063356.X. In this patent, a guide wheel supported by a spring is further provided inside the main body. The guide wheel presses against the outer edge of the hinge arm and can slide on its surface. A locking groove is also provided on the hinge arm. When the hinge is in the closed state, the guide wheel falls into the locking groove for fixation. This solved the technical problem of easy leakage after the oven is closed. However, during the later use process, the applicant found that the spring supporting the guide wheel in this structure has a complex structure, is troublesome to install, and has a high production cost. Therefore, it is necessary to further improve it. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies of the existing technology and provide a single - spring door hinge with a simple structure, convenient assembly, and low production cost.

[0004] The object of the present invention is achieved in the following way: A single-leaf door hinge, which includes a main body installed on the cabinet door and a hinge arm movably hinged at its front end. The hinge arm is snap-fixed on the cabinet body. A pull arm is also hingedly installed on the hinge arm. A sliding arm is also installed in the main body in a front-back sliding manner. The front end of the sliding arm is slidably fixed in a first chute on the main body through a first pin shaft, and the rear end of the sliding arm is slidably fixed in a second chute on the main body through a second pin shaft. A tension spring is arranged between the rear end of the pull arm and the second pin shaft. A guide wheel is installed at the front end of the sliding arm, and the guide wheel presses against the outer edge of the hinge arm and can slide on its surface. A locking groove is also arranged on the hinge arm. When the hinge is in the closed state, the guide wheel falls into the locking groove and is fixed.

[0005] The cross-section of the locking groove is in a "V" shape.

[0006] The cross-section of the locking groove is in a trapezoidal shape with a larger upper part and a smaller lower part.

[0007] The guide wheel is rotatably fixed at the front end of the sliding arm through a first pin shaft.

[0008] A third pin shaft is arranged at the rear end of the pull arm. After passing through the pull arm, the third pin shaft is slidably installed in a third chute on the main body, and the front end of the tension spring is hooked on the third pin shaft.

[0009] The main body, the pull arm and the sliding arm are arranged in an open groove shape, and the pull arm and the sliding arm are installed in the open groove of the main body.

[0010] The beneficial effects of the present invention are: 1. The structure is simple, the assembly is convenient, the production cost is low, and the market competitiveness is improved. 2. Only one spring is needed to realize the automatic reset closing of the hinge or the hovering of the door opening, and the locking function after closing the door, which greatly simplifies the mechanical structure and improves the production and processing efficiency. Description of the Drawings

[0011] Figure 1 、 2 It is the overall assembly effect diagram of the present invention.

[0012] Figure 3 、 4 It is the structural assembly drawing of the present invention.

[0013] Figure 5 、 6 It is the structural cross-sectional view of the present invention. Detailed Embodiment

[0014] The present invention will be further described in detail below with reference to the accompanying drawings. A single - leaf door hinge includes a main body 1 installed on the cabinet door and a hinge arm 2 movably hinged at its front end. The hinge arm 2 is snap - fixed to the cabinet body. A pull arm 3 is also hingedly installed on the hinge arm 2. A sliding arm 4 is slidably installed back - and - forth in the main body 1. The front end of the sliding arm 4 is slidably fixed in a first sliding groove 6 on the main body 1 through a first pin shaft 5, and the rear end of the sliding arm 4 is slidably fixed in a second sliding groove 8 on the main body 1 through a second pin shaft 7. A tension spring 9 is arranged between the tail end of the pull arm 3 and the second pin shaft 7. A guide wheel 10 is installed at the front end of the sliding arm 4. The guide wheel 10 presses against the outer edge of the hinge arm 2 and can slide on its surface. A locking groove 11 is also arranged on the hinge arm 2. When the hinge is in the closed state, the guide wheel 10 falls into the locking groove 11 and is fixed.

[0015] The cross - section of the locking groove 11 is in a "V" shape.

[0016] The cross - section of the locking groove 11 is in a trapezoidal shape with the upper part larger and the lower part smaller.

[0017] The guide wheel 10 is rotatably fixed at the front end of the sliding arm 4 through the first pin shaft 5.

[0018] A third pin shaft 12 is arranged at the rear end of the pull arm 3. After passing through the pull arm 3, the third pin shaft 12 is slidably installed in a third sliding groove 13 on the main body 1. The front end of the tension spring 9 is hooked on the third pin shaft 12.

[0019] The main body 1, the pull arm 3 and the sliding arm 4 are arranged in an open - groove shape, and the pull arm 3 and the sliding arm 4 are installed in the open - groove of the main body 1.

[0020] Working principle: When assembling this hinge, the main - body part is fixed on the cabinet door of the oven, and the hinge - arm part is installed on the cabinet body. When the cabinet door is opened and closed, the main - body part rotates around its hinge point with the hinge arm, and the hinge arm pulls the pull arm and the tension spring to move. When the hinge is closed, the restoring force generated by the tension spring enables the hinge to drive the cabinet door to close automatically or hover.

[0021] Among them, during the opening and closing process of the hinge, the pulling force generated by the tension spring reversely pulls the sliding arm 4 forward through the second pin shaft 7, so as to use the sliding arm 4 to push the guide wheel forward, making it elastically press and slide on the surface of the hinge arm. During the opening and closing process of the hinge, the guide wheel and the hinge arm are mutually extruded, and the guide wheel reversely pushes the sliding arm to make a back - and - forth sliding movement. The first sliding groove and the second sliding groove arranged on the main body can play a role in restricting its front - and - back displacement and guiding, making the movement of the sliding arm stable and smooth.

[0022] It should be noted that in order to prevent heat leakage from the oven door after it is closed, resulting in heat energy loss or safety accidents such as users being scalded. In this case, a locking groove is provided on the hinge arm, and the cross-section of the locking groove is in a "V" shape or a trapezoidal shape with a larger upper part and a smaller lower part. When the hinge is in the closed state, the guide wheel just inserts into the locking groove, playing a role in resisting the opening of the cabinet door, so as to avoid heat leakage caused by the expansion of the steam inside the oven during the use of the oven. In addition, the locking groove can play a guiding role by virtue of its special cross-sectional shape, so that after the guide wheel is stuck in it, a thrust force for closing the cabinet door can be generated, so that the oven door always has a certain pressure pressing on the cabinet body, thereby generating a pre-tightening force for closing the cabinet door and making the oven door always in the best sealing state.

[0023] Compared with the traditional technology, the structure in this case only requires one spring, and this spring can provide the automatic reset force for closing the hinge and the locking force for pushing the guide wheel towards the hinge arm. Therefore, it can greatly simplify the mechanical structure, reduce the production cost while improving the production efficiency, and enhance the market competitiveness. At the same time, the power of the guide wheel is provided by a larger spring. Compared with the traditional small spring, its mechanical performance is better, thus effectively extending its service life, so it can be widely promoted and used.

[0024] The above shows and describes 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 by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, such as the setting position of the locking groove and its cross-sectional shape. These changes and improvements all fall within the scope of the present invention claimed.

Claims

1. A single-leaf door hinge, characterized in that: It includes a main body (1) installed on the cabinet door and a hinge arm (2) movably hinged to the front end thereof. The hinge arm (2) is snap-fixed to the cabinet body. A pulling arm (3) is also hingedly installed on the hinge arm (2). A sliding arm (4) is also installed in the main body (1) in a front-back sliding manner. The front end of the sliding arm (4) is slidably fixed in a first sliding groove (6) on the main body (1) through a first pin shaft (5), and the rear end of the sliding arm (4) is slidably fixed in a second sliding groove (8) on the main body (1) through a second pin shaft (7). A tension spring (9) is arranged between the tail end of the pulling arm (3) and the second pin shaft (7). A guide wheel (10) is installed at the front end of the sliding arm (4). The guide wheel (10) abuts against the outer edge of the hinge arm (2) and can slide on its surface. A locking groove (11) is also arranged on the hinge arm (2). When the hinge is in the closed state, the guide wheel (10) falls into the locking groove (11) for fixation; The guide wheel (10) is rotatably fixed to the front end of the sliding arm (4) through the first pin shaft (5); A third pin shaft (12) is arranged at the rear end of the pulling arm (3). After passing through the pulling arm (3), the third pin shaft (12) is slidably installed in a third sliding groove (13) on the main body (1). The front end of the tension spring (9) is hooked on the third pin shaft (12).

2. The single-leaf door hinge according to claim 1, characterized in that: The cross section of the locking groove (11) is in a "V" shape.

3. The single-leaf door hinge according to claim 1, characterized in that: The cross section of the locking groove (11) is in a trapezoidal shape with a larger upper part and a smaller lower part.

4. The single-leaf door hinge according to claim 1, characterized in that: The main body (1), the pulling arm (3) and the sliding arm (4) are arranged in an open groove shape, and the pulling arm (3) and the sliding arm (4) are installed in the open groove of the main body (1).

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