A snap-fit plastic part which is easy to assemble

Abstract

This utility model relates to the field of plastic fastener technology, and more particularly to a snap-fit ​​plastic part that is easy to assemble. The snap-fit ​​plastic part includes an outer tube, an expansion head, a guide assembly, a trapezoidal push block, and a drive assembly. An inner tube is installed inside the outer tube, and an expansion head for easy assembly is installed at the end of the outer tube. A guide assembly is installed between the inner tube and the expansion head. The snap-fit ​​plastic part provided by this utility model significantly reduces the initial alignment difficulty through the synergistic effect of the expansion head and the guide assembly. The expansion design of the expansion head increases the inlet area of ​​the outer tube, allowing the guide rod of the inner tube to enter the guide groove under the guidance of the expansion ramp even with slight angular deviations. The smooth transition between the tapered guide groove and the slide groove achieves automatic centering of the inner tube, completing pre-positioning without precise manual adjustment, shortening the single assembly time, significantly improving assembly efficiency, and reducing labor costs.

Description

Technical Field

[0001] This utility model relates to the field of plastic fastener technology, and in particular to a snap-on plastic fastener that is easy to assemble. Background Technology

[0002] In various mechanical assembly, electronic equipment assembly, and daily necessities production, snap-fit ​​structures for plastic parts are widely used due to their advantages such as eliminating the need for additional fasteners and ease of installation. Existing plastic snap-fit ​​structures mostly rely on clips and corresponding slots or hooks on the connectors for fixation, their core principle being the use of the elastic deformation of the plastic material to achieve engagement. However, in actual assembly processes, especially for embedded connectors, traditional snap-fit ​​structures present significant operational challenges:

[0003] On the one hand, the snap-fit ​​mechanism of embedded connectors and the snap-fit ​​structure of the connected parts are often located in concealed positions or deep cavities, making it difficult to visually observe the alignment during assembly. The angle and position must be repeatedly adjusted by hand to ensure the snap-fit ​​is accurately inserted into the slot. On the other hand, the adjustment process is cumbersome. Forcing the snap-fit ​​in when it is not fully aligned may cause localized deformation or even breakage of the plastic part. Repeated insertion and removal not only prolongs assembly time but also accelerates wear on the snap-fit ​​and slot, reducing the lifespan of the connection structure. Especially in mass production scenarios, this cumbersome alignment operation significantly reduces assembly efficiency and increases labor costs.

[0004] Therefore, it is necessary to provide a new snap-fit ​​plastic part that is easy to assemble to solve the above-mentioned technical problems. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a snap-fit ​​plastic part that is easy to assemble.

[0006] The snap-fit ​​plastic part provided by this utility model includes: an outer tube, an expansion head, a guide component, a trapezoidal push block, and a drive component. An inner tube is installed inside the outer tube, and an expansion head for easy assembly is installed at the end of the outer tube. A guide component is installed between the inner tube and the expansion head. The guide component is used to quickly insert the inner tube into the inner tube. Trapezoidal push blocks are symmetrically installed inside the outer tube. A drive component is installed between the outer tube and the trapezoidal push blocks. The drive component drives the trapezoidal push blocks to move for quickly unlocking the snap-fit ​​between the outer tube and the inner tube.

[0007] Preferably, the guiding assembly includes: a guide groove, a guide rod, and a spring. The guide rod is symmetrically slidably connected inside the inner sleeve. A circular plate is fixedly connected to the outer wall of each guide rod. A mounting plate is fixedly connected inside the inner sleeve. A spring is sleeved on the outer wall of each guide rod. One end of each spring is fixedly connected to the corresponding circular plate, and the other end is fixedly connected to the mounting plate. The expansion head has symmetrically opened guide grooves inside. The outer sleeve has symmetrically opened sliding grooves corresponding to the guide grooves inside, and the end of the sliding groove near the guide groove is connected to the guide groove.

[0008] Preferably, the inner sleeve is symmetrically fixedly connected to the end of a first hook, and the outer sleeve is symmetrically fixedly connected to the inside of a second hook corresponding to the first hook, and the first hook and the second hook engage.

[0009] Preferably, the drive assembly includes: a drive plate, a second spring, and a connecting rod. The outer wall of the outer sleeve is symmetrically provided with mounting grooves. The inner wall of each mounting groove is slidably connected to a drive plate, and the opposite side of each drive plate is provided with anti-slip texture. The opposite side of each drive plate is fixedly connected to a corresponding trapezoidal push block. The second hook is fixedly connected to a connecting rod inside. In the snap-fit ​​state, the connecting rod contacts the inclined surface of the corresponding trapezoidal push block. The end of each trapezoidal push block away from the connecting rod is fixedly connected to a second spring, and the other end of each second spring is fixedly connected to the inner wall of the outer sleeve.

[0010] Preferably, both the first hook and the second hook are made of elastic plastic.

[0011] Preferably, spring one is a compression spring, spring two is a tension spring, and the elastic force of spring two is greater than the elastic force of the second hook.

[0012] Compared with related technologies, the snap-fit ​​plastic parts provided by this utility model, which are easy to assemble, have the following advantages:

[0013] The synergistic effect of the expansion head and the guide assembly significantly reduces the difficulty of initial alignment. The expansion head's expansion design increases the inlet area of ​​the outer sleeve, and even with slight angular deviations, the guide rod of the inner sleeve can enter the guide groove under the guidance of the expansion ramp. The smooth transition between the tapered guide groove and the slide groove enables automatic centering of the inner sleeve, completing the pre-positioning without the need for precise manual adjustment, shortening the assembly time per assembly, significantly improving assembly efficiency, and reducing labor costs.

[0014] The design of the drive component enables convenient and non-destructive separation: the drive board is externally mounted and has anti-slip texture, allowing for manual operation without special tools. The trapezoidal push block presses the connecting rod with an inclined surface, and the tension of the second spring drives the second hook to deform synchronously, making the hook separation process smooth and controllable, avoiding damage to components caused by the violent operation of traditional unlocking methods; the automatic reset function of the first and second springs after unlocking ensures that each component returns to its initial state, without affecting the accuracy of the next assembly, which is especially suitable for equipment that requires frequent disassembly and maintenance. Attached Figure Description

[0015] Figure 1 A schematic diagram of the structure of the snap-fit ​​plastic part that is easy to assemble according to this utility model;

[0016] Figure 2 for Figure 1 The diagram shows a cross-sectional view of the outer casing.

[0017] Figure 3 for Figure 2 The diagram shows the structure of the second hook.

[0018] Figure 4 for Figure 2 The diagram shows a cross-sectional view of the inner sleeve.

[0019] The following are the labels in the diagram: 1. Outer sleeve; 2. Inner sleeve; 3. Expansion head; 4. Trapezoidal push block; 5. Guide groove; 6. Guide rod; 7. Spring 1; 8. Circular plate; 10. Slide groove; 11. First hook; 12. Second hook; 13. Drive plate; 14. Spring 2; 15. Connecting rod; 16. Mounting groove. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0021] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0022] Please see Figures 1 to 4A snap-fit ​​plastic part for easy assembly includes: an outer sleeve 1, an expansion head 3, a guide assembly, a trapezoidal push block 4, and a drive assembly. An inner sleeve 2 is installed inside the outer sleeve 1. An expansion head 3 for easy assembly is installed at the end of the outer sleeve 1. A guide assembly is installed between the inner sleeve 2 and the expansion head 3, allowing the inner sleeve 2 to be quickly inserted into the outer sleeve 1. Trapezoidal push blocks 4 are symmetrically installed inside the outer sleeve 1. A drive assembly is installed between the outer sleeve 1 and the trapezoidal push blocks 4, driving the trapezoidal push blocks 4 to move and quickly unlock the snap-fit ​​between the outer sleeve 1 and the inner sleeve 2. The guide assembly includes: a guide groove 5, a guide rod 6, and a spring 7. The inner sleeve 2... The inner sleeve 2 has a guide rod 6 symmetrically slidably connected inside. The outer wall of the guide rod 6 is fixedly connected to a circular plate 8. The inner sleeve 2 is fixedly connected to a mounting plate. The outer wall of the guide rod 6 is fitted with a spring 7. One end of the spring 7 is fixedly connected to the corresponding circular plate 8, and the other end is fixedly connected to the mounting plate. The inner expansion head 3 has a guide groove 5 symmetrically opened inside. The outer sleeve 1 has a sliding groove 10 symmetrically opened inside, corresponding to the guide groove 5. The end of the sliding groove 10 near the guide groove 5 is connected to the guide groove 5. The end of the inner sleeve 2 is symmetrically fixedly connected to a first hook 11. The inner sleeve 1 has a second hook 12 symmetrically fixedly connected inside, corresponding to the first hook 11. The first hook 11 and the second hook 12 are engaged.

[0023] It should be noted that during assembly, the end of the inner sleeve 2 with the first hook 11 is aligned with the expansion head 3 at the end of the outer sleeve 1, and the inner sleeve 2 is pushed to move into the inner sleeve 1. The guide rod 6 slides along the inner wall of the guide groove 5. The guide rod 6 is subjected to the lateral extrusion force of the groove wall and moves closer to each other along the inner wall of the inner sleeve 2 towards the center. The circular plate 8 fixed on the outer wall of the guide rod 6 compresses the spring 7 sleeved on the rod simultaneously. When the guide rod 6 slides completely into the slide groove 10 connected to the guide groove 5, the initial axial positioning of the inner sleeve 2 and the outer sleeve 1 is achieved.

[0024] Please see Figure 2 and Figure 3 The drive assembly includes a drive plate 13, a second spring 14, and a connecting rod 15. The outer wall of the outer sleeve 1 is symmetrically provided with mounting grooves 16. The inner wall of the mounting grooves 16 is slidably connected to the drive plate 13, and the opposite side of the drive plate 13 is provided with anti-slip texture. The opposite side of the drive plate 13 is fixedly connected to the corresponding trapezoidal push block 4. The second hook 12 is fixedly connected to the connecting rod 15 inside. In the snap-fit ​​state, the connecting rod 15 contacts the inclined surface of the corresponding trapezoidal push block 4. The end of the trapezoidal push block 4 away from the connecting rod 15 is fixedly connected to the second spring 14. The other end of the second spring 14 is fixedly connected to the inner wall of the outer sleeve 1. The first hook 11 and the second hook 12 are both made of elastic plastic. The first spring 7 is a compression spring, and the second spring 14 is a tension spring. The elastic force of the second spring 14 is greater than that of the second hook 12.

[0025] It should be noted that when disassembly is required, the drive plate 13 is pushed to move towards the expansion head 3, causing the trapezoidal push block 4 fixed on the opposite side to slide synchronously along the inner wall of the outer sleeve 1. At the same time, the spring 14 connected to the other end of the trapezoidal push block 4 is stretched and stored. When the trapezoidal push block 4 moves, its inclined surface contacts the connecting rod 15 fixed inside the second hook 12 and generates compression. After the connecting rod 15 is compressed, it causes the second hook 12 to bend towards the center of the outer sleeve 1, so that the engagement of the second hook 12 and the first hook 11 gradually separates. When the deformation of the second hook 12 reaches the critical value, the first hook 11 loses its constraint and can be pulled out from the outer sleeve 1 under the action of external force.

[0026] The working principle of the snap-fit ​​plastic part that is easy to assemble provided by this utility model is as follows:

[0027] I. Initial Alignment Guidance

[0028] During assembly, align the end of the inner sleeve 2 with the first hook 11 with the expansion head 3 at the end of the outer sleeve 1; at this time, the guide rod 6, which is symmetrically slidably connected inside the inner sleeve 2, is placed at the entrance of the guide groove 5 of the expansion head 3; the expansion design of the expansion head 3 increases the entrance area and reduces the difficulty of initial alignment. Even if there is a slight angular deviation, the guide rod 6 can enter the guide groove 5 under the guidance of the expansion slope.

[0029] The pre-positioning function of the guide component:

[0030] The inner sleeve 2 is pushed into the outer sleeve 1, and the guide rod 6 slides along the inner wall of the guide groove 5. Due to the tapered design of the guide groove 5, the guide rod 6 is subjected to lateral extrusion force from the groove wall and moves closer to each other along the inner wall of the inner sleeve 2 towards the center. During this process, the circular plate 8 fixed on the outer wall of the guide rod 6 simultaneously compresses the spring 7 sleeved on the rod, causing the spring 7 to store force. When the guide rod 6 slides completely into the slide groove 10 connected to the guide groove 5, the parallel inner wall of the slide groove 10 restricts the lateral movement of the guide rod 6, achieving the initial axial positioning of the inner sleeve 2 and the outer sleeve 1, and avoiding angular displacement during the assembly process.

[0031] Final locking of the hook structure:

[0032] Continue advancing the inner sleeve 2, with the first hook 11, symmetrically fixed at its end, gradually approaching the second hook 12 inside the outer sleeve 1. When they come into contact, the inclined surfaces of the first hook 11 and the second hook 12 press against each other, utilizing the elastic deformation of the plastic to create a yielding effect. The first hook 11 bends slightly inward, and the second hook 12 bends slightly outward. Continue advancing until the first hook 11 completely passes the protrusion of the second hook 12, at which point they elastically return to their original position, and the hook heads of the first hook 11 and the second hook 12 engage with each other, forming a mechanical lock and completing the assembly. At this point, the guide rod 6, under the preload of the spring 7, presses tightly against the inner wall of the slide groove 10, further enhancing the connection stability.

[0033] II. Unlocking Phase: Rapid Decoupling of Driver Components

[0034] Triggering operation of driver board 13:

[0035] When disassembly is required, press the drive plate 13 in the mounting groove 16 on the outer wall of the outer sleeve 1. The anti-slip texture on the opposite side of the drive plate 13 can increase the friction of the hand and prevent slipping. Push the drive plate 13 to move towards the expansion head 3, which will cause the trapezoidal push block 4 fixed on the opposite side to slide synchronously along the inner wall of the outer sleeve 1. At the same time, the spring 14 connected to the other end of the trapezoidal push block 4 will be stretched and stored.

[0036] The process of separating the hook:

[0037] When the trapezoidal push block 4 moves, its inclined surface contacts and squeezes the connecting rod 15 fixed inside the second hook 12. After being squeezed, the connecting rod 15 drives the second hook 12 to bend towards the center of the outer sleeve 1, so that the engagement point of the second hook 12 and the first hook 11 gradually separates. When the deformation of the second hook 12 reaches the critical value, the first hook 11 loses its constraint and can be pulled out from the outer sleeve 1 under the action of external force.

[0038] Component reset action:

[0039] After the inner sleeve 2 is pulled out, the guide rod 6 is released from the restriction of the slide groove 10, and the spring 7 releases its compression force, pushing the circular plate 8 and the guide rod 6 to move in the opposite direction along the inner wall of the inner sleeve 2 to reset. After the drive plate 13 is released, the spring 14 releases its tension force. Since the tension of the spring 14 is greater than the elastic force of the second hook 12, it pulls the trapezoidal push block 4 and the drive plate 13 to slide in the opposite direction and return to the initial position, waiting for the next assembly operation.

[0040] All standard parts used above can be purchased from the market. Special-shaped parts can be customized according to the description in the instruction manual and the attached drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the existing technology. The machinery, parts and equipment adopt conventional models in the existing technology, which will not be described in detail here.

[0041] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A snap-fit ​​plastic part that is easy to assemble, characterized in that, include: Outer sleeve (1), and inner sleeve (2) is installed inside the outer sleeve (1); An expansion head (3) is installed at the end of the outer tube (1) for easy assembly. A guide assembly is installed between the inner sleeve (2) and the expansion head (3). The guide assembly is used to quickly insert the inner sleeve (2) into the interior of the outer sleeve (1). Trapezoidal pusher (4), trapezoidal pusher (4) is symmetrically installed inside the outer sleeve (1); A drive assembly is installed between the outer sleeve (1) and the trapezoidal push block (4). The drive assembly drives the trapezoidal push block (4) to move for quick unlocking of the snap-fit ​​between the outer sleeve (1) and the inner sleeve (2).

2. The snap-fit ​​plastic part for easy assembly according to claim 1, characterized in that, The guide assembly includes: guide groove (5), guide rod (6) and spring 1 (7). The guide rod (6) is symmetrically slidably connected inside the inner sleeve (2). The outer wall of the guide rod (6) is fixedly connected to a circular plate (8). The inner sleeve (2) is fixedly connected to a mounting plate. The outer wall of the guide rod (6) is fitted with spring 1 (7). One end of spring 1 (7) is fixedly connected to the corresponding circular plate (8), and the other end is fixedly connected to the mounting plate. The expansion head (3) is symmetrically provided with guide groove (5). The outer sleeve (1) is symmetrically provided with sliding groove (10) corresponding to the guide groove (5). The end of the sliding groove (10) close to the guide groove (5) is connected to the guide groove (5).

3. The snap-fit ​​plastic part for easy assembly according to claim 1, characterized in that, The inner sleeve (2) is symmetrically fixedly connected to the end of a first hook (11), and the outer sleeve (1) is symmetrically fixedly connected to the inside of a second hook (12) corresponding to the first hook (11), and the first hook (11) and the second hook (12) are engaged.

4. The snap-fit ​​plastic part for easy assembly according to claim 1, characterized in that, The drive assembly includes a drive plate (13), a second spring (14), and a connecting rod (15). The outer wall of the outer sleeve (1) is symmetrically provided with mounting grooves (16). The inner wall of the mounting grooves (16) is slidably connected to the drive plate (13). The opposite side of the drive plate (13) is provided with anti-slip texture. The opposite side of the drive plate (13) is fixedly connected to the corresponding trapezoidal push block (4). The second hook (12) is fixedly connected to the connecting rod (15). In the snap-fit ​​state, the connecting rod (15) contacts the inclined surface of the corresponding trapezoidal push block (4). The end of the trapezoidal push block (4) away from the connecting rod (15) is fixedly connected to the second spring (14). The other end of the second spring (14) is fixedly connected to the inner wall of the outer sleeve (1).

5. The snap-fit ​​plastic part for easy assembly according to claim 3, characterized in that, The first hook (11) and the second hook (12) are both made of elastic plastic.

6. The snap-fit ​​plastic part for easy assembly according to claim 4, characterized in that, Spring 1 (7) is a compression spring, and spring 2 (14) is a tension spring. The elastic force of spring 2 (14) is greater than that of the second hook (12).

Images