Cam transmission structure of manual-automatic integrated door closer

Abstract

The cam transmission structure of the manual-automatic integrated door closer comprises a pull piece, a plurality of first positioning pins are fixedly arranged at the upper end, close to the left side, of the pull piece in a penetrating mode, two second positioning pins are fixedly arranged at the upper end, close to the right side, of the pull piece in a penetrating mode, a bearing seat is arranged below the pull piece, and the two second positioning pins are fixedly connected with the bearing seat. An output shaft vertically and rotatably penetrates through the upper end, close to the second positioning pin, of the pull piece. When the output shaft is stressed to rotate, the output shaft drives the transmission cam to rotate, so that the transmission cam is matched with the guide roller to drive the rotating rod to rotate, and the rotating rod is matched with the bearing seat to drive the pull piece to horizontally move, so that the pull piece is matched with the first positioning pins to drive the pull rod to move, and acting force is prevented from being directly fed back to the pull rod; and meanwhile, the stress of high load is conducted to the pulling piece, so that the service life of the output shaft is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of door closer technology, and in particular to a cam transmission structure for a manual / automatic door closer. Background Technology

[0002] The working principle of a door closer is that when the door is opened, the door body drives the linkage to move, which in turn causes the transmission gear to rotate, driving the rack plunger to move to the right. During the rightward movement of the plunger, the spring is compressed. When the door opening process is completed, the elastic potential energy stored in the spring during the opening process is released, pushing the plunger to the left, which drives the transmission gear and the door closer linkage to rotate, thus closing the door. Door closers can be divided into hydraulic door closers and electric door closers, etc.

[0003] In actual use, when the output shaft of an existing door closer is subjected to force and rotates, the force is directly fed back to the pull rod, which can easily damage the pull rod. Furthermore, under high load conditions, the service life of the output shaft will also be affected. To address these issues, a cam transmission structure for a manual / automatic door closer is proposed. Utility Model Content

[0004] To address the shortcomings and defects in existing technologies, this utility model proposes a cam transmission structure for a manual / automatic door closer. This structure solves the technical problem in the prior art where, during actual use, the output shaft of the existing door closer is subjected to force, and the force is directly fed back to the pull rod, which easily damages the pull rod and affects the service life of the output shaft under high load.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A cam transmission structure for a manual / automatic door closer includes a pull plate. Several first positioning pins are fixedly inserted through the upper left side of the pull plate, and two second positioning pins are fixedly inserted through the upper right side of the pull plate. A bearing seat is located below the pull plate, and the two second positioning pins are fixedly connected to the bearing seat. An output shaft is vertically rotatably inserted through the upper end of the pull plate near the second positioning pins. A transmission assembly is coaxially fixedly connected to the output shaft. A rotating rod is rotatably connected to the upper end of the bearing seat, and the rotating rod is vertically rotatably inserted through the pull plate. The transmission assembly is drively connected to the rotating rod.

[0007] Preferably, the first positioning pin and the second positioning pin are the same size.

[0008] Preferably, the transmission assembly includes a transmission gear and a transmission cam coaxially fixedly connected to the output shaft. The transmission gear is located below the pull plate, and the transmission cam is located above the pull plate. The transmission cam is connected to the rotating rod in a transmission manner.

[0009] Preferably, a guide roller is coaxially fixedly connected to the rotating rod, the guide roller and the transmission cam are on the same horizontal plane, and the annular sidewall of the guide roller is closely attached to the arc-shaped sidewall of the transmission cam.

[0010] Preferably, a limit stop is coaxially fixedly connected to the output shaft, and the limit stop is located directly above the transmission cam.

[0011] Preferably, the cross-section of the limiting block is arranged in the shape of a racetrack.

[0012] Compared with the prior art, the advantages of this utility model are as follows:

[0013] When the output shaft is rotated under force, it drives the transmission cam to rotate, which in turn drives the rotating rod to rotate in conjunction with the guide roller. The rotating rod, in conjunction with the bearing seat, drives the pull plate to move horizontally. This causes the pull plate, in conjunction with several first positioning pins, to drive the pull rod to move, preventing the force from being directly fed back to the pull rod and avoiding damage to it. At the same time, it transmits the high load force to the pull plate, extending the service life of the output shaft. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the cam transmission structure of a manual / automatic door closer proposed in this utility model.

[0015] Figure 2 This is a top view schematic diagram of the cam transmission structure of a manual / automatic door closer proposed in this utility model.

[0016] Figure 3 This is a front view schematic diagram of the cam transmission structure of a manual / automatic door closer proposed in this utility model.

[0017] In the diagram: 1. Pull tab, 2. First positioning pin, 3. Second positioning pin, 4. Bearing seat, 5. Output shaft, 6. Rotating rod, 7. Transmission gear, 8. Transmission cam, 9. Guide roller, 10. Limit stop. Detailed Implementation

[0018] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and 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 this utility model.

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0020] Reference Figure 1-3 A cam drive structure for a manual / automatic door closer includes a pull plate 1. Several first positioning pins 2 are fixedly inserted through the upper end of the pull plate 1 near the left side. The first positioning pins 2 are used to position and fix a pull rod connecting seat (not shown in the figure) on the pull plate 1. The pull rod connecting seat (not shown in the figure) is used for installing and fixing the pull rod. Two second positioning pins 3 are fixedly inserted through the upper end of the pull plate 1 near the right side. A bearing seat 4 is provided below the pull plate 1. The two second positioning pins 3 are fixedly connected to the bearing seat 4. The two second positioning pins 3 are used to position and fix the bearing seat 4 on the pull plate 1. The first positioning pins 2 and the second positioning pins 3 are of the same size.

[0021] A vertically rotating output shaft 5 is installed near the upper end of the pull tab 1, close to the second positioning pin 3. A transmission assembly is coaxially fixedly connected to the output shaft 5. A rotating rod 6 is rotatably connected to the upper end of the bearing seat 4. The rotating rod 6 is vertically rotating and passes through the pull tab 1. The transmission assembly is connected to the rotating rod 6. The transmission assembly includes a transmission gear 7 and a transmission cam 8 coaxially fixedly connected to the output shaft 5. The transmission gear 7 is located below the pull tab 1, and the transmission cam 8 is located above the pull tab 1. The transmission cam 8 is connected to the rotating rod 6. A guide roller 9 is coaxially fixedly connected to the rotating rod 6. The guide roller 9 and the transmission cam 8 are on the same horizontal plane, and the annular sidewall of the guide roller 9 is tightly attached to the arc-shaped sidewall of the transmission cam 8. The output shaft 5 is subjected to force and rotates, causing the output shaft 5 to drive the coaxially connected transmission cam 8 to rotate, and the rotation of the transmission cam 8, in turn, drives the guide roller 9 to rotate. The lever 6 rotates, and the rotating lever 6, in conjunction with the bearing seat 4, drives the pull plate 1 to move horizontally. This causes the pull plate 1, in conjunction with several first positioning pins 2, to drive the pull rod connecting seat (not shown in the figure) to move, preventing the force from being directly fed back to the pull rod of the pull rod connecting seat (not shown in the figure), thus avoiding damage to the pull rod (not shown in the figure). At the same time, the high load force is transmitted to the pull plate 1, extending the service life of the output shaft 5. A limit stop 10 is coaxially fixedly connected to the output shaft 5. The limit stop 10 is located directly above the transmission cam 8. The cross-section of the limit stop 10 is racetrack shaped. The rotation of the output shaft 5 drives the limit stop 10 to rotate simultaneously until the limit stop 10 comes into contact with the rotating lever 6, thereby limiting the rotation angle of the output shaft 5 and avoiding damage to the pull rod (not shown in the figure) and the return spring (not shown in the figure) inside the door closer.

[0022] When the door is opened or closed, the output shaft 5 is subjected to force and rotates, causing the output shaft 5 to drive the coaxially connected transmission cam 8 to rotate. The rotation of the transmission cam 8, in conjunction with the guide roller 9, drives the rotating rod 6 to rotate. The rotation of the rotating rod 6, in conjunction with the bearing seat 4, drives the pull piece 1 to move horizontally. This causes the pull piece 1, in conjunction with several first positioning pins 2, to drive the pull rod connecting seat (not shown in the figure) to move, preventing the force from being directly fed back to the pull rod of the pull rod connecting seat (not shown in the figure), thus avoiding damage to the pull rod (not shown in the figure). At the same time, the high load force is transmitted to the pull piece 1, extending the service life of the output shaft 5.

[0023] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A cam transmission structure of a hand-automatic door closer, comprising a pull tab (1), characterized in that, The upper end of the pull tab (1) near the left side is fixedly provided with several first positioning pins (2), and the upper end of the pull tab (1) near the right side is fixedly provided with two second positioning pins (3). A bearing seat (4) is provided below the pull tab (1), and the two second positioning pins (3) are fixedly connected to the bearing seat (4). An output shaft (5) is vertically rotatably provided at the upper end of the pull tab (1) near the second positioning pins (3). A transmission component is coaxially fixedly connected to the output shaft (5). A rotating rod (6) is rotatably connected at the upper end of the bearing seat (4). The rotating rod (6) is vertically rotatably provided through the pull tab (1), and the transmission component is rotatably connected to the rotating rod (6).

2. A cam drive structure of a manual-automatic door closer according to claim 1, wherein The first positioning pin (2) and the second positioning pin (3) are the same size.

3. The cam drive structure of a kind of hand self-closing door closer according to claim 1, characterized in that, The transmission assembly includes a transmission gear (7) and a transmission cam (8) coaxially fixedly connected to the output shaft (5). The transmission gear (7) is located below the pull plate (1), and the transmission cam (8) is located above the pull plate (1). The transmission cam (8) is connected to the rotating rod (6) in a transmission manner.

4. A cam drive structure of a manual-automatic door closer according to claim 3, wherein A guide roller (9) is coaxially fixedly connected to the rotating rod (6). The guide roller (9) and the transmission cam (8) are on the same horizontal plane, and the annular sidewall of the guide roller (9) is closely attached to the arc-shaped sidewall of the transmission cam (8).

5. The cam drive structure of a manual-automatic door closer according to claim 3, wherein A limit stop (10) is coaxially fixedly connected to the output shaft (5), and the limit stop (10) is located directly above the transmission cam (8).

6. The cam transmission structure of a manual / automatic door closer according to claim 5, characterized in that, The cross-section of the limiting block (10) is set in the shape of a racetrack.

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