Improvements in door closers

Abstract

The utility model relates to door closer technology field especially relates to a door closer improved structure, it mainly solved the problem of poor safety in use of door closer in the prior art, including outer tube and inner tube, the end of outer tube is equipped with first buffer device, is equipped with first spring in the inner tube, and the front end of inner tube is equipped with second buffer device, and second buffer device includes end cover, movable element and support assembly, movable element has screw thread area and buffer area, and support assembly includes piston and protective sleeve, and the central axis of piston is equipped with screw hole, and the upper end of elastic member is located on movable element and leans to the lower surface of piston, so that the lower end of screw thread area is in contact with the upper end of screw hole, when movable element rotates too much inwards, the both ends of first spring are connected with first buffer device and support assembly respectively, so that the upper end of screw thread area is in contact with the lower end of screw hole.

Description

Technical Field

[0001] This utility model relates to the field of door closer technology, and in particular to an improved structure of a door closer. Background Technology

[0002] On February 15, 2022, the applicant filed a utility model patent application (authorization announcement number CN217205978U) entitled "A Novel Horizontal Door Closer," which specifically discloses: an outer tube and an inner tube that can slide relative to each other; a first buffer device at the end of the outer tube for adjusting the total air intake and exhaust of the outer tube; a compression spring inside the inner tube; and a second buffer device at the front end of the inner tube for adjusting the compression stroke of the compression spring. The second buffer device includes a movable component located at the front end of the inner tube and rotating relative to the inner tube. A support assembly is provided inside the inner tube in cooperation with the movable component. The support assembly moves along the axial direction of the inner tube by rotating the movable component. The outer wall of the support assembly is tightly connected to the inner wall of the inner tube. The two ends of the compression spring are connected to the first buffer device and the support assembly, respectively. By setting the first buffer device to control the total air intake and exhaust of the outer tube and the second buffer device to control the compression stroke of the compression spring, dual adjustment is achieved, thereby improving the buffer adjustment range of the horizontal door closer.

[0003] However, in actual use, it was found that the external threads on the moving part completely cover the outer circumference of the moving part. This means that when the moving part is rotated too much to adjust the support assembly, it will detach from the support assembly and become difficult to reinstall, requiring it to be returned to the factory for repair. When the moving part is rotated too much inward, the end cap at the front end of the moving part is easily crushed and damaged, causing damage to the door closer and resulting in poor safety. Utility Model Content

[0004] Therefore, in view of the above problems, this utility model provides an improved door closer structure, which mainly solves the problem of poor safety in the use of existing door closers.

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

[0006] An improved door closer structure includes an outer tube and an inner tube that can slide relative to each other. The end of the outer tube is provided with a first buffer device for adjusting the total airflow into and out of the outer tube. The inner tube contains a first spring, and the front end of the inner tube is provided with a second buffer device for adjusting the compression stroke of the first spring. The second buffer device includes an end cap covering the front end of the inner tube, a movable component passing through the end cap and rotating relative to the end cap, and a support assembly threadedly connected to the movable component. The outer circumferential surface of the movable component has a threaded region distributed in the axial central region and buffer zones distributed in the axial bilateral regions. The support assembly includes a piston and a component fixed to the lower end face of the piston. The piston has a protective sleeve, and a threaded hole at its central axis that mates with the external thread of the movable part. An elastic element is located on the movable part and inside the protective sleeve. The lower end of the elastic element is fixed to the lower end of the movable part. The piston is tightly connected to the inner wall of the inner tube. The support assembly moves along the axial direction of the inner tube by rotating the movable part. When the movable part rotates outward too much, the upper end of the elastic element abuts against the lower surface of the piston, so that the lower end of the threaded area contacts the upper end of the threaded hole. When the movable part rotates inward too much, the two ends of the first spring are connected to the first buffer device and the support assembly respectively, so that the upper end of the threaded area contacts the lower end of the threaded hole.

[0007] Furthermore, the buffer zone is not provided with external threads.

[0008] Furthermore, the outer circumferential surface of the piston is provided with at least one first annular groove, and a sealing ring is embedded in the first annular groove.

[0009] Furthermore, a second annular groove is provided on the outer circumferential surface of the piston and below the first annular groove, and a notch is provided on the piston to connect with the second annular groove.

[0010] An improved door closer structure includes an outer tube and an inner tube that can slide relative to each other. The end of the outer tube is provided with a first buffer device for adjusting the total airflow into and out of the outer tube. A first spring is provided inside the inner tube. The front end of the inner tube is provided with a second buffer device for adjusting the compression stroke of the first spring. The second buffer device includes an end cap covering the front end of the inner tube, a movable member passing through the end cap and rotating relative to the end cap, and a support assembly threadedly connected to the movable member. The outer circumferential surface of the movable member has a threaded region distributed in the central axial region and buffer zones distributed in the axially opposite regions. The lower end of the movable member is provided with a limiting protrusion ring. The support assembly... The device includes a piston and a protective sleeve fixed to the lower end face of the piston. The piston has a threaded hole at its central axis that mates with the external thread of a movable part. An elastic element is fitted on the movable part and inside the protective sleeve. The piston is tightly connected to the inner wall of the inner tube. The support assembly moves along the axial direction of the inner tube by rotating the movable part. When the movable part rotates outward too much, the two ends of the elastic element abut against the limiting protrusion ring and the piston, respectively, so that the lower end of the threaded area contacts the upper end of the threaded hole. When the movable part rotates inward too much, the two ends of the first spring are connected to the first buffer device and the support assembly, respectively, so that the upper end of the threaded area contacts the lower end of the threaded hole.

[0011] Furthermore, the lower end face of the piston, located inside the protective sleeve, is recessed with a relief groove, and the elastic element is disposed within the relief groove.

[0012] Furthermore, the elastic element is a spring, a pressure sleeve, an elastic sleeve, or a silicone sleeve.

[0013] By adopting the aforementioned technical solution, the beneficial effects of this utility model are as follows: The improved structure of this door closer allows for the rotation of the movable component during use, causing the support assembly that cooperates with the movable component to move along the axial direction of the inner tube. Since the two ends of the first spring are respectively connected to the support assembly and the first buffer device, the movement of the support assembly along the axial direction of the inner tube causes a change in the compression stroke of the first spring, thereby adjusting the door opening force and the uniformity of movement during reset. Furthermore, by providing a threaded area distributed in the central axial region and buffer zones distributed on both sides of the axial region on the outer circumference of the movable component, and fixing the lower end of the elastic element to the lower end of the movable component, the support assembly includes a piston. The device includes a protective sleeve and an elastic element fitted inside the protective sleeve on the movable part. When the movable part rotates outward excessively, the upper end of the elastic element abuts against the lower surface of the piston, causing the lower end of the threaded area to contact the upper end of the threaded hole. This effectively prevents the movable part from detaching from the support assembly, allowing the consumer to easily rotate the movable part in the opposite direction to connect it to the support assembly. When the movable part rotates inward excessively, a buffer area prevents the support assembly from squeezing the end cap. The two ends of the first spring are connected to the first buffer device and the support assembly respectively, causing the upper end of the threaded area to contact the lower end of the threaded hole. This prevents the end cap at the front end of the movable part from being squeezed and damaged, improving the safety of the door closer and solving the problem of poor safety in the existing door closer technology. Attached Figure Description

[0014] Figure 1 This is a cross-sectional structural schematic diagram of the door closer according to Embodiment 1 of this utility model;

[0015] Figure 2 This is a cross-sectional view of a door closer in an embodiment of the present invention, showing the door closer in a state where the moving part has rotated outward too much.

[0016] Figure 3 yes Figure 2 A magnified view of a section at point A in the middle;

[0017] Figure 4 This is a cross-sectional view of the door closer in the state where the moving part rotates inward too much in Embodiment 1 of this utility model.

[0018] Figure 5 yes Figure 4 A magnified view of a section at point B in the middle;

[0019] Figure 6 This is a cross-sectional view of the door closer in the case of excessive outward rotation of the two moving parts in this embodiment of the present invention.

[0020] Figure 7 yes Figure 6 A magnified view of a section at point C;

[0021] Figure 8This is a cross-sectional view of the door closer in the state where the moving part rotates inward too much in Embodiment 2 of this utility model;

[0022] Figure 9 yes Figure 8 A magnified view of a section at point D;

[0023] Figure 10 This is a bottom view of the piston structure in Embodiment 2 of this utility model;

[0024] Figure 11 This is a cross-sectional structural diagram of the piston and elastic element in Embodiment 2 of this utility model. Detailed Implementation

[0025] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0026] The embodiment of this utility model is as follows:

[0027] Example 1:

[0028] refer to Figures 1 to 6 As shown, an improved door closer structure includes an outer tube 1 and an inner tube 2 that can slide relative to each other. The end of the outer tube 1 is provided with a first buffer device 3 for adjusting the total airflow into and out of the outer tube 1. The inner tube 2 contains a first spring 4, and the front end of the inner tube 2 is provided with a second buffer device 5 for adjusting the compression stroke of the first spring 4. The second buffer device 5 includes an end cap 51 covering the front end of the inner tube 2, a movable member 52 passing through the end cap 51 and rotating relative to the end cap 51, and a support assembly 53 threadedly connected to the movable member 52. The outer circumferential surface of the movable member 52 has a threaded region 501 distributed in the axial central region and buffer zones 502 distributed in the axial bilateral regions. The threaded region 501 has external threads. The support assembly 53 includes a piston 531 and a protective sleeve 5 fixed to the lower end face of the piston 531. 32. The piston 531 has a threaded hole 533 at its central axis that mates with the external thread of the movable part 52. An elastic element 6 is fitted on the movable part 52 and inside the protective sleeve 532. The lower end of the elastic element 6 is fixed to the lower end of the movable part 52. The piston 531 is tightly connected to the inner wall of the inner tube 2. The support assembly 53 moves along the axial direction of the inner tube 2 by rotating the movable part 52. When the movable part 52 rotates outward too much, the upper end of the elastic element 6 abuts against the lower surface of the piston 531, so that the lower end of the threaded area 501 contacts the upper end of the threaded hole 533. When the movable part 52 rotates inward too much, the two ends of the first spring 4 are connected to the first buffer device 3 and the support assembly 53 respectively, so that the upper end of the threaded area 501 contacts the lower end of the threaded hole 533. In this embodiment, the elastic element 6 is a spring.

[0029] This door closer features an improved structure. During use, rotating the movable part 52 causes the support assembly 53, which cooperates with the movable part 52, to move axially along the inner tube 2. Since the two ends of the first spring 4 are connected to the support assembly 53 and the first buffer device 3 respectively, the movement of the support assembly 53 along the inner tube 2 causes a change in the compression stroke of the first spring 4, thereby adjusting the door opening force and the uniformity of movement during reset. Furthermore, by providing a threaded area 501 distributed in the central axial region and buffer zones 502 distributed on both axial sides on the outer circumference of the movable part 52, and fixing the lower end of the elastic element 6 to the lower end of the movable part 52, the support assembly 53 includes a piston 531 and a protective sleeve 532. The piston 531 is located on the movable part 52 and positioned on the protective sleeve 532. An elastic element 6 is installed inside the piston 531. When the movable part 52 rotates outward too much, the upper end of the elastic element 6 abuts against the lower surface of the piston 531, so that the lower end of the threaded area 501 contacts the upper end of the threaded hole 533. This effectively prevents the movable part 52 from disengaging from the support assembly 53, making it convenient for consumers to rotate the movable part 52 in the opposite direction to connect with the support assembly 53. When the movable part 52 rotates inward too much, the buffer zone 501 prevents the support assembly 53 from squeezing the end cap 51. The two ends of the first spring 4 are connected to the first buffer device 3 and the support assembly 53 respectively, so that the upper end of the threaded area 501 contacts the lower end of the threaded hole 533. This prevents the end cap 51 at the front end of the movable part 52 from being squeezed and damaged, improving the safety of the door closer and solving the problem of poor safety of the door closer in the prior art.

[0030] Furthermore, the buffer zone 502 is not provided with external threads. During the rotation adjustment of the movable part 52, the buffer zone 502 plays a role in buffering and transition. When the movable part 52 rotates to near its limit position, the buffer zone 502 can avoid the impact force caused by the sudden contact or separation of the threads, making the rotation of the movable part 52 more stable, reducing wear, and extending the service life of the movable part 52 and the support assembly 53. At the same time, it also helps to improve the accuracy of the door closer adjustment.

[0031] Furthermore, the outer circumferential surface of the piston 531 is provided with two first annular grooves 11, and a sealing ring 12 is embedded in the first annular groove 11. The sealing ring 12 ensures the stability of the pressure inside the door closer, improves the sealing performance of the door closer, thereby ensuring that the door closer can work normally and stably, and enhances the use effect of the door closer.

[0032] In this embodiment, a second annular groove 13 is provided on the outer circumferential surface of the piston 531 and below the first annular groove 11. A notch 14 connected to the second annular groove 13 is provided on the piston 531. The design of the second annular groove 13 and the notch 14 can be used to install other auxiliary sealing elements or to discharge impurities that may enter between the piston 531 and the inner tube 2, further optimizing the sealing structure of the door closer, improving the dustproof and sealing capabilities of the door closer, and also facilitating the maintenance and upkeep of the door closer.

[0033] Example 2:

[0034] refer to Figures 6 to 11 As shown, an improved door closer structure includes an outer tube 1 and an inner tube 2 that can slide relative to each other. The end of the outer tube 1 is provided with a first buffer device 3 for adjusting the total airflow into and out of the outer tube 1. The inner tube 2 contains a first spring 4, and the front end of the inner tube 2 is provided with a second buffer device 5 for adjusting the compression stroke of the first spring 4. The second buffer device 5 includes an end cap 51 covering the front end of the inner tube 2, a movable member 52 passing through the end cap 51 and rotating relative to the end cap 51, and a support assembly 53 threadedly connected to the movable member 52. The outer circumferential surface of the movable member 52 has a threaded region 501 distributed in the axial central region and buffer zones 502 distributed in the axial bilateral regions. The threaded region 501 has external threads. The lower end of the movable member 52 is provided with a limiting protrusion ring 54. The support assembly 53 includes a piston 531... A protective sleeve 532 is fixed to the lower end face of the piston 531. The piston 531 has a threaded hole 533 at its central axis that mates with the external thread of the movable part 52. An elastic element 6 is fitted on the movable part 52 and inside the protective sleeve 532. The piston 531 is tightly connected to the inner wall of the inner tube 2. The support assembly 53 moves along the axial direction of the inner tube 2 by rotating the movable part 52. When the movable part 52 rotates outward too much, the two ends of the elastic element 6 abut against the limiting protrusion ring 54 and the piston 531 respectively, so that the lower end of the threaded area 501 contacts the upper end of the threaded hole 533. When the movable part 52 rotates inward too much, the two ends of the first spring 4 are connected to the first buffer device 3 and the support assembly 53 respectively, so that the upper end of the threaded area 501 contacts the lower end of the threaded hole 533. In this embodiment, the elastic element 6 is a spring.

[0035] This door closer features an improved structure. During use, rotating the movable part 52 causes the support assembly 53, which cooperates with the movable part 52, to move axially along the inner tube 2. Since the two ends of the first spring 4 are connected to the support assembly 53 and the first buffer device 3 respectively, the movement of the support assembly 53 along the inner tube 2 causes a change in the compression stroke of the first spring 4, thereby adjusting the door opening force and the uniformity of movement during reset. Furthermore, the movable part 52 has a threaded area 501 distributed in the central axial region and buffer zones 502 distributed on both axial sides on its outer circumferential surface. A limiting protrusion 54 is provided at the lower end of the movable part 52. The support assembly 53 includes a piston 531 and a protective sleeve 532. A piston 531 is fitted onto the movable part 52 and inside the protective sleeve 532. When the movable part 52 rotates outward excessively, the two ends of the elastic element 6 abut against the limiting protrusion ring 54 and the piston 531 respectively, so that the lower end of the threaded area 501 contacts the upper end of the threaded hole 533, effectively preventing the movable part 52 from disengaging from the support assembly 53, and facilitating the consumer to rotate the movable part 52 in the opposite direction to connect with the support assembly 53. When the movable part 52 rotates inward excessively, the buffer zone 501 prevents the support assembly 53 from squeezing the end cap 51. The two ends of the first spring 4 are connected to the first buffer device 3 and the support assembly 53 respectively, so that the upper end of the threaded area 501 contacts the lower end of the threaded hole 533, preventing the end cap 51 at the front end of the movable part 52 from being squeezed and damaged, improving the safety of the door closer and solving the problem of poor safety of the door closer in the prior art.

[0036] Furthermore, the lower end face of the piston 531, located inside the protective sleeve 532, is recessed with a relief groove 7. The elastic element 6 is disposed in the relief groove 7. The relief groove 7 provides a stable installation position for the elastic element 6, so that the elastic element 6 will not shift during compression and extension, ensuring that the elastic element 6 can accurately play a limiting role, and further enhancing the stability and reliability of the door closer structure.

[0037] In the above embodiments one and two, the elastic element 6 is a spring, or it can be a pressure sleeve, elastic sleeve, silicone sleeve, or other component with elastic recovery capability.

[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0039] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0040] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0041] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the invention without departing from the spirit and scope of the invention as defined in the appended claims, all of which shall be within the scope of protection of the invention.

Claims

1. An improved structure for a door closer, characterized in that: The device includes an outer tube and an inner tube that can slide relative to each other. The end of the outer tube is equipped with a first buffer device for adjusting the total airflow into and out of the outer tube. The inner tube contains a first spring, and the front end of the inner tube is equipped with a second buffer device for adjusting the compression stroke of the first spring. The second buffer device includes an end cap covering the front end of the inner tube, a movable component passing through the end cap and rotating relative to the end cap, and a support assembly threadedly connected to the movable component. The outer circumferential surface of the movable component has a threaded region distributed in the central axial region and buffer zones distributed on both axial sides. The support assembly includes a piston and a protective sleeve fixed to the lower end face of the piston. The piston has a threaded hole at its central axis that mates with the external thread of the movable part. An elastic element is provided on the movable part and inside the protective sleeve. The lower end of the elastic element is fixed to the lower end of the movable part. The piston is tightly connected to the inner wall of the inner tube. The support assembly moves along the axial direction of the inner tube by rotating the movable part. When the movable part rotates outward too much, the upper end of the elastic element abuts against the lower surface of the piston, so that the lower end of the threaded area contacts the upper end of the threaded hole. When the movable part rotates inward too much, the two ends of the first spring are connected to the first buffer device and the support assembly respectively, so that the upper end of the threaded area contacts the lower end of the threaded hole.

2. The improved door closer structure according to claim 1, characterized in that: The buffer zone is not provided with external threads.

3. The improved door closer structure according to claim 1 or 2, characterized in that: The piston has at least one first annular groove on its outer circumferential surface, and a sealing ring is embedded in the first annular groove.

4. The improved door closer structure according to claim 3, characterized in that: The piston has a second annular groove on its outer circumference and below the first annular groove, and the piston has a notch that connects to the second annular groove.

5. An improved structure for a door closer, characterized in that: The device includes an outer tube and an inner tube that can slide relative to each other. The end of the outer tube is equipped with a first buffer device for adjusting the total airflow into and out of the outer tube. The inner tube contains a first spring, and the front end of the inner tube is equipped with a second buffer device for adjusting the compression stroke of the first spring. The second buffer device includes an end cap covering the front end of the inner tube, a movable component passing through the end cap and rotating relative to the end cap, and a support assembly threadedly connected to the movable component. The outer circumferential surface of the movable component has a threaded region distributed in the central axial region and buffer zones distributed on both axial sides. The lower end of the movable component is equipped with a limiting protrusion ring. The support assembly includes a piston... A protective sleeve is fixed to the lower end face of the piston. The piston has a threaded hole at its central axis that mates with the external thread of the movable part. An elastic element is fitted on the movable part and inside the protective sleeve. The piston is tightly connected to the inner wall of the inner tube. The support assembly moves along the axial direction of the inner tube by rotating the movable part. When the movable part rotates outward too much, the two ends of the elastic element abut against the limiting protrusion ring and the piston, respectively, so that the lower end of the threaded area contacts the upper end of the threaded hole. When the movable part rotates inward too much, the two ends of the first spring are connected to the first buffer device and the support assembly, respectively, so that the upper end of the threaded area contacts the lower end of the threaded hole.

6. The improved door closer structure according to claim 5, characterized in that: The piston has a recessed relief groove on its lower end face and inside the protective sleeve, and the elastic element is disposed in the relief groove.

7. The improved door closer structure according to claim 1 or 5, characterized in that: The elastic element is a spring, a pressure sleeve, an elastic sleeve, or a silicone sleeve.

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