A pull-to-unlock bracket fixing and adjustment structure and a fire door closer including the same.

Abstract

This utility model discloses a pull-to-unlock bracket fixing and adjustment structure and a fire door closer including the same. The structure includes a bracket body, a slide groove, and a self-locking pull pin assembly for fixing the bracket body within the slide groove. The self-locking pull pin assembly includes a pull pin body, a pull pin spindle, a return spring, and a pulling member. The upper end of the pull pin body is a bolt rod with a hollow cavity and external threads, and the lower end is a bolt head. The bolt head has an opening at its center communicating with the hollow cavity. The pull pin spindle includes a thin rod section and a thick rod section coaxially connected. The thick rod section is located within the hollow cavity, and its lower end can extend from the lower end of the hollow cavity. The upper end of the thin rod section extends from the opening and is movably connected to the pulling member. A return spring is sleeved on the thin rod section. The lower end of the return spring abuts against the bolt head, and its upper end abuts against the thick rod section. The bracket body has a through-hole. The advantages are that this fixing and adjustment structure requires virtually no tools during installation and adjustment, is more convenient than screw locking, and allows for unlimited adjustment cycles.

Description

Technical Field

[0001] This utility model belongs to the technical field of building fire protection equipment, specifically relating to a pull-out unlocking bracket fixing and adjustment structure and a fire door closer containing the same. Background Technology

[0002] Fire door closers are mainly used on fire doors in various public or commercial settings, and the requirements for their opening and closing states vary depending on the situation. Generally, electric door closers have a bracket designed within the track, which can be adjusted within a certain range along the length of the track. During operation, the bracket needs to be securely fastened within the track. The existing method uses screws and nuts for fixing, with the nuts pre-embedded in the bracket. During installation, the screw is screwed into the nut, passing through the bracket and pressing against the top wall of the track to lock it in place. This fastening method has many drawbacks, which can seriously affect the door closer's opening and closing function: for example, if the screw is tightened too much, it can cause the top of the track to whiten, deform, or even deform the entire track; furthermore, if the screw is too tight, it can damage or deform the bracket; while if the screw is too loose, the bracket will slide. Therefore, it is necessary to design a new fixing and adjustment structure to better position the bracket within the track. Utility Model Content

[0003] This utility model provides a pull-to-unlock bracket fixing and adjustment structure and a fire door closer containing the same, aiming to avoid many problems that exist in fixing the bracket in the slide groove with screws and nuts.

[0004] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A pull-to-unlock bracket fixing and adjusting structure, which includes a bracket body, a slide groove, and a self-locking pull pin assembly for fixing the bracket body in the slide groove. The self-locking pull pin assembly includes a pull pin body, a pull pin spindle, a return spring, and a pulling member. The upper end of the pull pin body is a bolt rod with a hollow cavity and external threads, and the lower end is a bolt head. The bolt head has an opening at its center that communicates with the hollow cavity. The pull pin spindle includes a thin rod section and a thick rod section coaxially connected. The rod segment is located within the hollow cavity and its lower end can extend out from the lower end of the hollow cavity. The upper end of the thin rod segment extends from the opening and is movably connected to the pulling member. The thin rod segment is fitted with the return spring. The lower end of the return spring abuts against the bolt head, and the upper end abuts against the thick rod segment. The bracket body is provided with a through screw hole. When the bolt is tightened in the screw hole, the upper end of the thick rod segment can be positioned by the elastic force of the return spring against the top wall of the slide groove or by being inserted into the positioning hole provided on the top wall of the slide groove.

[0005] Based on the above technical solution, the present invention can be further improved as follows.

[0006] Furthermore, the pulling member is a metal pull ring, and the lower end of the thin rod section has a hole in the radial direction for the metal pull ring to pass through.

[0007] Furthermore, two support ears are symmetrically and spaced apart on both sides of the bottom surface of the bolt head. When the pull pin spindle is pulled down by the metal pull ring, the thick rod section retracts into the hollow cavity to disengage from the top wall of the slide groove or disengage from the positioning hole of the top wall of the slide groove to achieve unlocking. After the metal pull ring is pulled down and rotated 90 degrees, it can be released by being blocked and limited by the two support ears to keep the pull pin spindle in the unlocked position.

[0008] Furthermore, a plurality of positioning holes are evenly spaced along the length of the slide groove within a defined area on the top wall of the slide groove.

[0009] Furthermore, a reinforcing strip is formed by recessing the center of the top wall of the slide groove, and the reinforcing strip extends along the length of the slide groove and corresponds to the lower opening of the slide groove.

[0010] Furthermore, the positioning hole is formed on the reinforcing strip.

[0011] Furthermore, the outer side of the top wall of the chute is provided with a closed cover plate for shielding the reinforcing strip and the groove formed by its shape.

[0012] Furthermore, the bracket body is locked and fixed in the slide groove by the self-locking pull pin assembly provided at both ends. The bracket body is provided with corresponding hooks at both ends. After the bracket body is locked and fixed in the slide groove, the pull member can be hooked and retracted by the hooks.

[0013] Furthermore, the hook and the bracket body are integrally formed from rigid plastic or aluminum alloy.

[0014] This utility model also provides a fire door closer, which includes the above-mentioned bracket fixing and adjustment structure.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] The bracket body of the bracket fixing and adjusting structure provided by this utility model is fixed in the slide groove by a self-locking pull pin assembly. When the position of the bracket needs to be adjusted, the bracket body can be unlocked by pulling the pull pin core shaft through the pull member, and then the position can be adjusted. After adjustment, the pull member is released, and the elastic force of the return spring will cause the pull pin core shaft to automatically press against the inner wall of the slide groove or enter the positioning hole to achieve positioning. Installation and adjustment are basically tool-free, which is quite convenient. Compared with the screw locking method, there is no problem of stripping the screw after repeated tightening. Therefore, the opening position can be adjusted at any time and the number of adjustments is unlimited. In addition, there is no problem of over-tightening and damaging the slide groove or crushing the bracket body. Attached Figure Description

[0017] Figure 1 An isometric view of a pull-out unlocking bracket fixing and adjustment structure provided by this utility model;

[0018] Figure 2 for Figure 1 Axonometric view of one end of the slide groove of the bracket fixing and adjusting structure shown (with the reinforcing strip facing upwards);

[0019] Figure 3 for Figure 1 The diagram shows the bracket fixing and adjustment structure after being cut along the center line of the reinforcing strip.

[0020] Figure 4 for Figure 3 A magnified schematic diagram of the structure within the dashed circle of the bracket fixing and adjustment structure shown.

[0021] Figure 5 for Figure 4 A cross-sectional view of the self-locking pull pin assembly in the structure shown;

[0022] Figure 6 for Figure 5 The isometric view of the self-locking pull pin assembly in the locked state;

[0023] Figure 7 for Figure 5 The image shows an isometric view of the self-locking pull pin assembly in the unlocked state.

[0024] The attached diagram lists the components represented by each number as follows:

[0025] 1. Bracket body; 2. Slide groove; 3. Self-locking pull pin assembly; 4. Pull pin body; 5. Pull pin spindle; 6. Return spring; 7. Pulling component; 8. Support ear; 9. Positioning hole; 10. Reinforcing strip; 11. Hook. Detailed Implementation

[0026] The technical solution provided by this utility model will be clearly and completely described below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0027] In the description of this utility model, if terms such as "upper", "lower", "left", "right", "top", "bottom", "inner", and "outer" are used to indicate the orientation or positional relationship, the orientation or positional relationship indicated is 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.

[0028] like Figures 1 to 7 As shown, this utility model provides a pull-to-unlock bracket fixing and adjustment structure, which includes a bracket body 1, a slide groove 2, and a self-locking pull pin assembly 3 for fixing the bracket body 1 in the slide groove 2. The self-locking pull pin assembly 3 includes a pull pin body 4, a pull pin spindle 5, a return spring 6, and a pulling member 7. The upper end of the pull pin body 4 is a bolt rod with a hollow cavity and external threads, and the lower end is a bolt head. The bolt head has an opening at its center that communicates with the hollow cavity. The pull pin spindle 5 includes a thin rod section and a thick rod section coaxially connected. The thick rod section is located at... The thin rod section extends from the opening and is movably connected to the pull member 7. The thin rod section is fitted with the return spring 6. The lower end of the return spring 6 is pressed against the bolt head, and the upper end is pressed against the thick rod section. The bracket body 1 is provided with a through screw hole. When the bolt is tightened in the screw hole, the upper end of the thick rod section can be positioned by the elastic force of the return spring 6 against the top wall of the slide groove 2 or inserted into the positioning hole 9 on the top wall of the slide groove 2.

[0029] It should be noted that the aforementioned bracket fixing and adjustment structure can be used for fixing and adjusting the limit bracket within the door closer's slide rail, as well as for fixing and adjusting the feedback bracket. Furthermore, besides connecting the pull pin body to the bracket body via an external thread, other common connection methods such as snap-fit ​​(clamp connection) can also be used.

[0030] In one embodiment of this utility model, such as Figure 6 As shown in Figure 7, the pulling member 7 is a metal pull ring, and the lower end of the thin rod section has a hole in the radial direction for the metal pull ring to pass through.

[0031] Understandably, the metal pull ring is preferably designed as a circular ring, but it can also be made into other common shapes. In addition to being connected directly through a hole, it can also be connected to the top of a thin rod via a rope (in which case the top can be fitted with a cap that is slightly larger than the diameter of the opening at the center of the bolt head). The pulling element can also be the pull rope itself.

[0032] In one embodiment of this utility model, such as Figure 5As shown, two support ears 8 are symmetrically and spaced apart on both sides of the bottom surface of the bolt head. When the pull ring is pulled downwards to pull the pin spindle 5, the thick rod section retracts into the hollow cavity to disengage from the top wall of the slide groove 2 or disengage from the positioning hole 9 in the top wall of the slide groove 2, thus unlocking. After the metal pull ring is pulled down and rotated 90 degrees, it can be released by being blocked and limited by the two support ears 8, thus keeping the pin spindle 5 in the unlocked position. Figure 7 As shown.

[0033] Understandably, grooves can be provided on the two support ears to facilitate the metal pull ring's 90-degree rotation and engagement. The self-locking pull pin assembly has a built-in return spring; after manual pulling, the return spring is compressed, pulling up the central pull pin spindle (as shown). Figure 7 As shown), after being released, the middle pull pin spindle automatically resets, i.e., enters the locked state (as shown). Figure 6 (As shown). When locked, the pull ring 24 is placed in the groove of the pull pin body 21. When unlocked, the pull ring 24 rotates 90 degrees and is placed on the pull pin body 21, which can achieve a temporary locking state for better adjustment.

[0034] In one embodiment of this utility model, such as Figure 3 and Figure 4 As shown, a plurality of positioning holes 9 are evenly spaced along the length of the slide 2 within a set area on the top wall of the slide 2.

[0035] It should be noted that each positioning hole corresponds to one opening and closing angle of the door closer. When self-locking pull pin assemblies are installed at both ends of the bracket body, two sets of corresponding positioning holes are also installed in the corresponding area of ​​the inner wall of the slide.

[0036] In one embodiment of this utility model, such as Figure 2 As shown, a reinforcing strip 10 is formed by a recess in the center of the top wall of the slide groove 2. The reinforcing strip 10 extends along the length of the slide groove 2 and corresponds to the lower opening of the slide groove 2. The positioning hole 9 is formed on the reinforcing strip 10. A closed cover plate is provided on the outer side of the top wall of the slide groove 2 to cover the reinforcing strip 10 and the groove formed by its shape.

[0037] It should be noted that the concave reinforcing strip not only effectively increases the strength of the slide groove, but also facilitates the setting of the positioning hole. When the pull pin spindle is inserted into the positioning hole, it can pass through the positioning hole and extend into the concave groove, which plays a good positioning role and minimizes the impact on the outside. The product will also look more beautiful, especially when the closed cover is installed, the product surface is closed, which is more aesthetically pleasing.

[0038] In one embodiment of the present invention, the bracket body 1 is locked and fixed in the slide groove 2 by the self-locking pull pin assembly 3 provided at both ends. The bracket body 1 is provided with hooks 11 at both ends. After the bracket body 1 is locked and fixed in the slide groove 2, the pull member 7 can be hooked and retracted by the hooks 11.

[0039] It should be noted that when the slide rail is designed with two sets of corresponding positioning holes, during adjustment, you can first pull up the pin spindle of one of the self-locking pin components and rotate it to temporarily fix it in the unlocked state. Then pull up the other one, and then slide the bracket body left and right to the desired position. Finally, release the pin spindle into the corresponding positioning hole to achieve positioning of the bracket body.

[0040] Understandably, the hook engages the metal pull ring or other type of pulling component to prevent the naturally drooping component from adversely affecting the slider sliding within the opening below the groove. For example... Figure 3 and 4 As shown, the hooks are located on the outer sides of both ends of the bracket body, and have a certain degree of elasticity and are designed with oblique guides to facilitate the insertion and removal of the metal pull rings.

[0041] In one embodiment of this utility model, the hook 11 and the bracket body 1 are integrally formed from rigid plastic or aluminum alloy material.

[0042] It should be noted that the unibody design not only reduces costs, but also provides better connection and durability.

[0043] This utility model also provides a fire door closer, which includes the above-mentioned bracket fixing and adjustment structure.

[0044] It should be noted that after using the bracket fixing and adjustment structure provided by this utility model, adjusting the fixing bracket is much simpler, without affecting the movement of the slider in the track or causing deformation of the track, thus affecting the internal structure. During subsequent use, the internal structure of the fire door will not move on its own due to insecure fixing, and tool assistance is generally not required when adjusting the position of the bracket body. The opening position can be adjusted at any time as needed, with no limit to the number of adjustments, without affecting the internal structure. It also has a longer lifespan than existing screw fixing methods, which are prone to stripping after repeated screw turning; the fixing and adjustment structure provided by this utility model does not have this problem.

[0045] 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. A stent fixation adjustment structure for pull-unlocking, characterized by, The bracket includes a support body (1), a slide groove (2), and a self-locking pull pin assembly (3) for fixing the support body (1) in the slide groove (2). The self-locking pull pin assembly (3) includes a pull pin body (4), a pull pin spindle (5), a return spring (6), and a pulling member (7). The upper end of the pull pin body (4) is a bolt rod with a hollow cavity and external threads, and the lower end is a bolt head. The bolt head has an opening at its center that communicates with the hollow cavity. The pull pin spindle (5) includes a thin rod section and a thick rod section coaxially connected. The thick rod section is located in the hollow cavity and is lower than the thin rod section. The end can extend from the lower end of the hollow cavity. The upper end of the thin rod section extends from the opening and is movably connected to the pull member (7). The thin rod section is fitted with the return spring (6). The lower end of the return spring (6) abuts against the bolt head, and the upper end abuts against the thick rod section. The bracket body (1) is provided with a through screw hole. When the bolt is screwed into the screw hole, the upper end of the thick rod section can be positioned by the elastic force of the return spring (6) against the top wall of the slide groove (2) or inserted into the positioning hole (9) on the top wall of the slide groove (2).

2. The stent fixation adjustment structure according to claim 1, wherein, The pulling member (7) is a metal pull ring, and the lower end of the thin rod section has a hole in the radial direction for the metal pull ring to pass through.

3. The stent fixation adjustment structure of claim 2, wherein, The bottom surface of the bolt head is symmetrically provided with two support ears (8) at intervals. When the pull pin spindle (5) is pulled down by the metal pull ring, the thick rod section retracts into the hollow cavity to disengage from the top wall of the slide groove (2) or disengage from the positioning hole (9) of the top wall of the slide groove (2) to unlock. After the metal pull ring is pulled down and rotated 90 degrees, it can be released by the two support ears (8) to keep the pull pin spindle (5) in the unlocked position.

4. The stent fixation adjustment structure of claim 1, wherein, Multiple positioning holes (9) are evenly spaced along the length of the slide (2) within a set area on the top wall of the slide (2).

5. The pull-to-unlock bracket fixation adjustment structure of claim 1, wherein, The top wall of the groove (2) is recessed to form a reinforcing strip (10), which extends along the length of the groove (2) and corresponds to the lower opening of the groove (2).

6. The pull-to-unlock bracket fixation adjustment structure of claim 5, wherein, The positioning hole (9) is formed on the reinforcing strip (10).

7. The pull-to-unlock bracket fixation adjustment structure of claim 5, wherein, The outer side of the top wall of the groove (2) is provided with a closed cover plate for covering the reinforcing strip (10) and the groove formed by its shape.

8. The pull-to-unlock bracket fixation adjustment structure according to any one of claims 1 to 7, characterized in that, The bracket body (1) is locked and fixed in the slide groove (2) by the self-locking pull pin assembly (3) provided at both ends. The bracket body (1) is provided with hooks (11) at both ends. After the bracket body (1) is locked and fixed in the slide groove (2), the pull member (7) can be hooked and retracted by the hooks (11).

9. The pull-to-unlock bracket fixation adjustment structure of claim 8, wherein, The hook (11) and the bracket body (1) are integrally formed from rigid plastic or aluminum alloy.

10. A fire door closer, characterised in that, It includes the bracket fixing and adjusting structure as described in any one of claims 1 to 9.

Images