Automatic door opening and closing mechanism

Abstract

This invention proposes an automatic door opening and closing mechanism, solving the problem in existing technologies where revolving doors cannot stop at a fixed angle or position during opening and closing. The mechanism includes a lower cam with a vertical rotation limiting shaft at the center of its upper surface. Multiple planar grooves extend outward from the rotation limiting shaft, all at the same horizontal height and evenly distributed circumferentially. A planar boss is also provided between adjacent grooves, all extending outward from the rotation limiting shaft, with a transition arc surface between adjacent bosses and grooves. An upper cam has a rotation limiting hole at the center of its lower surface that mates with the rotation limiting shaft, and the lower surface of the upper cam fits tightly with the lower cam. Overall, this invention's automatic door opening and closing mechanism is simple in structure, easy to use, and can stop the revolving door at multiple specific positions or angles, improving the user experience and demonstrating excellent practicality.

Description

Technical Field

[0001] This utility model relates to the field of revolving door technology, and in particular to a component that is simple in structure, easy to use, and capable of automatically opening and closing doors at a specific angle. Background Technology

[0002] Floor springs and door closers are commonly used automatic door closing devices in the current market. Their core components are the upper and lower cams, arranged vertically. The automatic closing of the revolving door is achieved through the cooperation of these cams. The upper cam is fixedly mounted on the door hinge and rotates synchronously with it. When a person pushes or pulls the revolving door, applying force, the door hinge drives the upper cam to rotate synchronously. During the rotation of the upper cam, the lower cam experiences a vertical force from it, causing it to descend vertically and compress the sealed space below, increasing the pressure within that space. Once the force applied to the upper cam disappears, the pressure in the sealed space below causes the lower cam to exert a counterforce on the upper cam, thus causing the upper cam to return the door hinge to its original position, achieving the automatic opening and closing effect of the revolving door. However, existing door closers can only achieve automatic opening and closing of revolving doors. They cannot meet the needs of scenarios where the revolving door needs to stop at a fixed angle or position. Therefore, there is an urgent need for a mechanism that can allow a revolving door to stop at a fixed angle or position during the opening and closing process. Summary of the Invention

[0003] This invention proposes an automatic door opening and closing mechanism, which solves the problem in the prior art that revolving doors cannot stay at a fixed angle or position during the opening and closing process.

[0004] The technical solution of this utility model is implemented as follows: an automatic door opening and closing mechanism, comprising:

[0005] The lower cam is cylindrical, with a vertical rotation limiting shaft in the middle of its upper surface. Multiple planar grooves extend outward from the rotation limiting shaft as the center, and all the grooves are located at the same horizontal height and are evenly arranged in the circumferential direction.

[0006] A planar boss is provided between two adjacent grooves. All bosses extend outward with the rotation limiting shaft as the center. All bosses are located at the same horizontal height and are evenly arranged in the circumferential direction. The horizontal height of the bosses is higher than that of the grooves. A transition arc surface is provided between adjacent bosses and grooves.

[0007] The upper cam is cylindrical and located above the lower cam. A rotation limiting hole that mates with the rotation limiting shaft is provided in the middle of the lower surface. The lower surface of the upper cam is in close contact with the lower cam.

[0008] In a preferred embodiment, there are four grooves and four bosses, and the central angle between adjacent grooves and bosses is 45°.

[0009] In a preferred embodiment, the width of the groove remains consistent along its extension direction, and the width of the boss gradually increases from the inside to the outside along its extension direction. Both the groove and the boss extend from the inside to the outer edge of the lower cam.

[0010] In a preferred embodiment, the horizontal height of the upper surface of the rotary limiting shaft is higher than the horizontal height of the boss, so as to ensure that the rotary limiting shaft is fully embedded in the rotary limiting hole;

[0011] The upper end face of the rotary limiting shaft is chamfered.

[0012] In a preferred embodiment, the lower surface of the lower cam is a horizontal surface, and multiple limiting grooves extending vertically are formed on the outer peripheral surface of the lower cam. Vertically extending slide rails are embedded in the limiting grooves to ensure that the lower cam can only perform vertical reciprocating motion.

[0013] The outer peripheral surface of the upper cam is a circular outer surface, and a vertically extending connecting shaft is fixed on the upper surface of the upper cam. A keyway is machined on the connecting shaft to be fixedly connected with the door hinge.

[0014] After adopting the above technical solution, the beneficial effects of this utility model are as follows: The automatic door opening and closing mechanism of this utility model sets multiple grooves and protrusions on the tightly fitted surfaces of the lower cam and the upper cam, and these grooves and protrusions are evenly distributed with the rotation limiting shaft and rotation limiting hole at the center position as the center, so that the upper cam, which is fixedly connected to the door shaft, can stay at multiple fixed angles and positions, improving the user experience. Therefore, the number of grooves and protrusions can be reasonably set according to different usage scenarios. In the process of the upper cam and the lower cam cooperating, the transition arc surface set between the protrusion and the groove can ensure that the two parts are always in a tightly fitted state, and no jamming will occur during the rotation of the revolving door.

[0015] With four grooves and four bosses, and a central angle of 45° between adjacent grooves and bosses, this structure allows the revolving door to stop at positions of 0°, 45°, 90°, 135°, 180°, 225°, 270°, 315°, and 360°. At these positions, the bosses fit perfectly into the corresponding grooves. When a pushing force is applied to the revolving door, the upper and lower cams rotate relative to each other, and the bosses and grooves no longer contact each other. Under the action of the transition arc surface, the revolving door can automatically rotate to the next fixed angle and position.

[0016] Setting the width of the groove to be consistent along its extension direction and the width of the boss to gradually increase along its extension direction ensures smooth insertion of the boss into the groove and prevents jerking. Furthermore, both the groove and the boss extend from the inside out to the outer edge of the lower cam, ensuring a tight fit between the boss and the groove. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1-3 This is a structural schematic diagram of an embodiment of the present invention from different angles;

[0019] Figure 4-7 This is a schematic diagram of the split structure of this embodiment;

[0020] In the figure: 1-lower cam; 11-rotational limiting shaft; 12-groove; 13-bore; 14-transition arc surface; 15-limiting groove; 16-chamfer; 2-upper cam; 21-rotational limiting hole; 22-connecting shaft; 23-keyway. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Example:

[0023] like Figures 1 to 7 The diagram shown illustrates different states of an embodiment of the automatic door opening and closing mechanism of this utility model patent. Figure 1-3 This is a diagram illustrating the combined states. Figure 4-7 As shown in the schematic diagram of the split structure, the automatic door opening and closing mechanism of this embodiment mainly includes two parts: lower cam 1 and upper cam 2. When installed and used, lower cam 1 is at the bottom and upper cam 2 is at the top. Lower cam 1 can only perform reciprocating linear motion in the vertical direction, and upper cam 2 can only perform rotational motion in the horizontal plane. No matter what state or position the two move to, their contact surfaces are always tightly fitted.

[0024] The lower cam 1 and upper cam 2 are generally cylindrical. To achieve the vertical reciprocating motion of the lower cam 1, multiple vertically extending limiting grooves 15 are formed on the outer circumference of the lower cam 1. Vertically extending slide rails (not shown in the figure) are embedded in these limiting grooves 15. The slide rails cooperate with the limiting grooves 15, and under the limiting effect of the slide rails, the lower cam 1 can only perform vertical reciprocating motion. In addition, the lower surface of the lower cam 1 is a horizontal surface. When it moves vertically downward, it will compress the space below, forming a high-pressure environment, thus providing conditions for subsequent automatic reset. To achieve the rotational motion of the upper cam 2, a vertically extending connecting shaft 22 is fixed on the upper surface of the upper cam 2. A keyway 23 is machined on the connecting shaft 22 to be fixedly connected to the door hinge (not shown in the figure). When people push the revolving door, the door hinge of the revolving door can drive the connecting shaft 22 to rotate through the keyway 23, that is, drive the entire upper cam 2 to rotate.

[0025] To achieve a tight fit between the lower cam 1 and the upper cam 2, the contact surface structure between them is crucial. In this embodiment, a vertical rotation limiting shaft 11 is provided at the middle of the upper surface of the lower cam 1. Multiple planar grooves 12 (four shown in the figure) extend outward from this rotation limiting shaft 11 as the center. All grooves 12 are located at the same horizontal height and are evenly arranged in the circumferential direction. Therefore, these four grooves 12 are perpendicular to each other, and the included angle between the centers of adjacent grooves 12 is 90°. Planar bosses 13 are also provided between adjacent grooves 12, meaning there are also four bosses 13. All bosses 13 extend outward from the rotation limiting shaft 11 as the center, are located at the same horizontal height and are evenly arranged in the circumferential direction, and the horizontal height of the bosses 13 is higher than that of the grooves 12. A transition arc surface 14 is provided between adjacent bosses 13 and grooves 12. With this structural design, the central angle between adjacent grooves 12 and protrusions 13 is 45°. This structure allows the revolving door to stop at positions of 0°, 45°, 90°, 135°, 180°, 225°, 270°, 315°, and 360°. At these specific angles, the protrusions 13 are precisely matched with the corresponding grooves 12, and the revolving door can automatically stop without external force. However, once a pushing force is applied to the revolving door, the upper cam 2 and the lower cam 1 rotate relative to each other, and the protrusions 13 and grooves 12 no longer contact each other. At this time, under the action of the transition arc surface 14, the revolving door can automatically rotate to the next fixed angle or position.

[0026] The upper cam 2 is also cylindrical, with a rotation limiting hole 21 in the middle of its lower surface to facilitate the tight fit of the rotation limiting shaft 11. At the same time, the lower surface of the upper cam 2 is also provided with grooves and bosses corresponding to the lower cam 1 to achieve a tight fit between the two components.

[0027] To ensure a tight fit between the lower cam 1 and the upper cam 2, this embodiment sets the groove 12 to have a consistent width along its extension direction, while the width of the boss 13 gradually increases from the inside to the outside along its extension direction. This ensures that the boss 13 is smoothly inserted into the groove 12, preventing any jerking. Both the groove 12 and the boss 13 extend from the inside to the outer edge of the lower cam 1, ensuring a tight fit between the boss 13 and the groove 12.

[0028] Finally, the horizontal height of the upper surface of the rotary limiting shaft 11 is higher than that of the boss 13 to ensure that the rotary limiting shaft 11 is fully embedded in the rotary limiting hole 21. Moreover, the upper end face of the rotary limiting shaft 11 is provided with a chamfer 16 to further ensure the tight fit between the lower cam 1 and the upper cam 2.

[0029] Overall, the automatic door opening and closing mechanism of this utility model has a simple structure and is easy to use. It can make the revolving door stop at multiple specific positions or angles, improve the user experience, and has good practicality.

[0030] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An automatic door opening mechanism characterized by, include: The lower cam (1) is cylindrical, with a vertical rotating limiting shaft (11) in the middle of its upper surface. Multiple planar grooves (12) extend outward from the rotating limiting shaft (11) as the center. All the grooves (12) are located at the same horizontal height and are evenly arranged in the circumferential direction. A planar boss (13) is provided between two adjacent grooves (12). All bosses (13) extend outward with the rotation limiting shaft (11) as the center. All bosses (13) are located at the same horizontal height and are evenly arranged in the circumferential direction. The horizontal height of the boss (13) is higher than that of the groove (12). A transition arc surface (14) is provided between adjacent bosses (13) and grooves (12). The upper cam (2) is cylindrical and located above the lower cam (1). A rotation limiting hole (21) that cooperates with the rotation limiting shaft (11) is provided in the middle of the lower surface. The lower surface of the upper cam (2) is in close contact with the lower cam (1).

2. The automatic door operator of claim 1, wherein: The number of grooves (12) and bosses (13) is four each, and the central angle between adjacent grooves (12) and bosses (13) is 45°.

3. The automatic door operator of claim 1, wherein: The width of the groove (12) remains consistent along its extension direction, and the width of the boss (13) gradually increases from the inside to the outside along its extension direction. Both the groove (12) and the boss (13) extend from the inside to the outside to the outer edge of the lower cam (1).

4. An automatic door opening mechanism according to any one of claims 1 to 3, wherein: The horizontal height of the upper surface of the rotating limiting shaft (11) is higher than the horizontal height of the boss (13) to ensure that the rotating limiting shaft (11) is fully embedded in the rotating limiting hole (21); The upper end face of the rotation limiting shaft (11) is chamfered (16).

5. The automatic door opening and closing mechanism as described in claim 1, characterized in that: The lower surface of the lower cam (1) is a horizontal surface. Multiple limiting grooves (15) extending vertically are opened on the outer peripheral surface of the lower cam (1). Vertically extending slide rails are embedded in the limiting grooves (15) to ensure that the lower cam (1) can only perform vertical reciprocating motion. The outer peripheral surface of the upper cam (2) is a circular outer surface. A vertically extending connecting shaft (22) is fixed on the upper surface of the upper cam (2). A keyway (23) is machined on the connecting shaft (22) to be fixedly connected to the door shaft.

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