Knob anti-falling structure

Abstract

The utility model relates to the technical field of knob anti-falling, in particular to a knob anti-falling structure, which comprises a bushing fixedly connected with a rotating shaft on a rotating device in a gluing manner. And the turncap is fixedly connected to the bushing in a mechanical contact interlocking manner. The utility model provides an anti-drop structure of a knob, which has the following advantages: a) the design scheme is simple and easy to implement, and does not need complex process requirements; b) the conventional processing and manufacturing process is not changed, and the skill requirements on technicians are not improved; c) the device is suitable for fixing knobs on rotating shafts of rotating devices of various specifications without influencing the performance of the rotating devices; d) the anti-falling problem of the knob in the use process and in a vibration environment is effectively solved; and e) repeated disassembly and assembly of the turncap are not influenced.

Description

Technical Field

[0001] This utility model relates to the field of knob anti-detachment technology, specifically a knob anti-detachment structure. Background Technology

[0002] Knobs are characterized by their ease of operation and sensitive feedback. They provide a good user experience while enabling rapid information transmission to the system, representing a superior human-computer interaction mode. Knobs are widely used in various devices and facilities in daily life, such as lamp knobs, switch knobs, car center console knobs, audio control knobs, and brightness control knobs. These knobs typically consist of a knob cap and a potentiometer or encoder (hereinafter referred to as the rotating device). The rotating device is fixed to the structure, and the knob cap is fixed to the shaft of the potentiometer or encoder. In everyday life, knob caps are mostly made of plastic or metal and are generally fixed to the shaft of the rotating device by a limiting groove and a spring. Due to the relatively mild usage environment in daily life, it is rare for the knob cap to loosen or fall off, and even if it does fall off, it will not have a significant impact.

[0003] In harsh operating environments, such as industrial settings, the knob cap is typically made of metal. The knob is secured primarily with set screws and thread-locking adhesive. The rotating shaft of a rotating device is usually D-shaped, used for upper limit control in the rotation direction. The knob cap is also typically made of metal with threaded holes designed to match the shaft dimensions. Thread-locking adhesive is applied to the set screw, which is then tightened. The tightening of the set screw and the knob cap threads compresses the rotating shaft, and the preload of the screw secures the knob cap to the shaft. In special applications such as aerospace, where harsh high and low temperature cycles and alternating vibration stresses exist, the vibration and extreme temperatures weaken the preload. Multiple set screws are typically used to secure the knob cap, but this still cannot completely prevent the knob cap from loosening and falling off axially. Summary of the Invention

[0004] To solve the above-mentioned technical problems, this utility model proposes a knob anti-dislodgement structure.

[0005] The technical problem to be solved by this utility model is achieved by the following technical solution:

[0006] A knob anti-dislodgement structure includes:

[0007] The bushing is fixedly connected to the rotating shaft on the rotating device by adhesive bonding.

[0008] The nut is fixedly connected to the bushing by a mechanical contact interlocking method.

[0009] As a further improvement of this utility model, a gap for filling structural adhesive is provided at the mating point between the bushing and the rotating shaft.

[0010] As a further improvement of this utility model, the inside of the rotating cap is provided with a groove that matches the bushing, and the outside of the bushing and the inside of the groove are provided with an anti-rotation structure.

[0011] As a further improvement of this utility model, the anti-rotation structure can be any one of a D-shaped structure, an waist-shaped structure, or a square structure.

[0012] As a further improvement of this utility model, a through hole is provided on the side of the bushing, and a threaded hole is provided on the side of the screw cap. The threaded hole and the through hole are matched in position and their central axes are collinear.

[0013] As a further improvement of this utility model, a set screw coated with thread adhesive is screwed into the through hole and the threaded hole.

[0014] As a further improvement of this utility model, a circular groove is provided on the side of the bushing, and a through threaded hole is provided on the side of the screw cap. The through threaded hole and the circular groove are matched in position and their central axes are collinear.

[0015] As a further improvement of this utility model, a set screw coated with thread adhesive is screwed into the circular groove and the through threaded hole.

[0016] The beneficial effects of this utility model are:

[0017] This utility model provides a knob anti-detachment structure with the following advantages: a) The design is simple and easy to implement, requiring no complex procedures; b) It does not change the conventional processing flow and does not increase the skill requirements of the process personnel; c) It is suitable for fixing knobs on the shafts of rotating devices of various specifications without affecting the performance of the rotating devices; d) It effectively solves the problem of knob detachment during use and under vibration; e) It does not affect the repeated disassembly and assembly of the knob cap. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0019] Figure 1 This is a schematic diagram of the bushing structure in Embodiment 1 of this utility model;

[0020] Figure 2 This is a schematic diagram of the swivel cap structure in Embodiment 1 of this utility model;

[0021] Figure 3 This is a schematic diagram of the assembly structure of the bushing, nut, and shaft in Embodiment 1 of this utility model;

[0022] Figure 4 This is a schematic diagram of the bushing structure in Embodiment 2 of this utility model;

[0023] Figure 5This is a schematic diagram of the swivel cap structure in Embodiment 2 of this utility model;

[0024] Figure 6 This is a schematic diagram of the assembly structure of the bushing, nut, and shaft in Embodiment 2 of this utility model.

[0025] In the diagram: 1. Bushing; 11. Clearance; 12. Through hole; 13. Circular groove; 14. Anti-rotation structure; 2. Screw cap; 21. Hole groove; 22. Threaded hole; 23. Through-hole threaded hole; 3. Shaft; 4. Set screw; 5. Structural adhesive; 6. Thread adhesive. Detailed Implementation

[0026] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0027] A knob anti-disengagement structure mainly includes two structures: a bushing 1 and a knob cap 2. The bushing 1 is fixedly connected to the rotating shaft 3 on the rotating device by adhesive bonding. The knob cap 2 is fixedly connected to the bushing 1 by mechanical contact interlocking.

[0028] Example 1

[0029] like Figure 1 As shown, bushing 1 is a rotating structure. The rotating shaft 3 on the rotating device is typically D-shaped. The interior of bushing 1 is designed to match the shape of the rotating shaft 3 in a D-shape to limit the rotation direction. A gap 11 is provided at the mating point between bushing 1 and rotating shaft 3 for filling with structural adhesive, which can firmly bond bushing 1 and rotating shaft 3 together. One or more through holes 12 are provided on the side of bushing 1 for fixing the screw cap 2. An anti-rotation structure 14 is provided on the exterior of bushing 1. The anti-rotation structure 14 can be D-shaped, waist-shaped, or square. In this embodiment, the anti-rotation structure 14 is designed as a D-shaped structure, and the length of the anti-rotation structure 14 is the same as the axial length of bushing 1.

[0030] like Figure 2 As shown, the inside of the screw cap 2 is provided with a groove 21 that matches the shape of the bushing 1. The external dimensions of the screw cap 2 should be smaller than the inner diameter of the thread used to install and fix the rotating device. The side of the screw cap 2 is provided with threaded holes 22, the number of which matches the number of through holes 12, and the installation position is unique and the central axis is collinear.

[0031] like Figure 3As shown, during installation, bushing 1 is first installed on the rotating shaft 3 of the rotating device. Structural adhesive is filled into the gap 11. The structural adhesive is used to permanently bond bushing 1 to the rotating shaft 3 of the rotating device, making it non-removable and resistant to high and low temperatures and vibration. Then, screw cap 2 is installed on bushing 1. After installation, the threaded hole 22 corresponds to the through hole 12. The set screw 4, coated with thread-locking adhesive 6, is inserted into the threaded hole 22 of screw cap 2, passes through the through hole 12 of bushing 1, and is fastened to the rotating shaft 3 of the rotating device. Thread-locking adhesive 6 fills the space between the threads of screw cap 2 and set screw 4, making it a removable thread-locking adhesive. Then, sealing adhesive is applied to the outer end of set screw 4 to prevent it from loosening and moving backward. Due to the presence of through hole 12 on bushing 1, even if the pre-tightening force of set screw 4 disappears, the sidewall of through hole 12 on bushing 1 can prevent screw cap 2 from axially loosening and falling off.

[0032] In this embodiment, multiple anti-loosening designs are provided: a) thread-locking adhesive 6, b) sealing adhesive, and c) bushing 1 structure. Even if the thread-locking adhesive loosens and the thread preload disappears, the sealing adhesive can prevent the set screw 4 from moving backward, and the sidewall of the through hole 12 on the bushing 1 can still ensure that the cap 2 does not loosen.

[0033] Example 2

[0034] like Figure 4 As shown, bushing 1 has a rotating structure. The rotating shaft 3 on the rotating device is typically D-shaped. The interior of bushing 1 is designed to match the shape of the rotating shaft 3 in a D-shape to limit the rotation direction. A gap 11 is provided at the mating point between bushing 1 and rotating shaft 3 for filling with structural adhesive, which can firmly bond bushing 1 and rotating shaft 3 together. One or more through holes 12 are provided on the side of bushing 1 for fixing the screw cap 2. An anti-rotation structure 14 is provided on the exterior of bushing 1, which can be D-shaped, waist-shaped, or square. In this embodiment, the anti-rotation structure 14 is designed as a D-shaped structure, and the length of the anti-rotation structure 14 is smaller than the length of the bushing 1, forming an anti-rotation recess. A circular groove 13 is also provided on the side of bushing 1, and the diameter of the circular groove 13 matches the selected set screw 4.

[0035] like Figure 5 As shown, the screw cap 2 has an internal groove 21 that matches the shape of the bushing 1, which is an anti-rotation boss that matches the anti-rotation recess on the bushing 1. The external dimensions of the screw cap 2 should be smaller than the threaded inner diameter of the rotating device. The screw cap 2 has threaded holes 22 on its side, the number of which matches the number of through holes 12, and the installation position is unique and the central axis is collinear. The screw cap 2 also has a through threaded hole 23 on its side, the axis of which is collinear with the circular groove 13 on the bushing 1, and the diameter matches the selected set screw 4.

[0036] like Figure 6As shown, during installation, first install the bushing 1 onto the rotating shaft 3 of the rotating device, and fill the gap 11 with structural adhesive. The structural adhesive is used to permanently bond the bushing 1 to the rotating shaft 3 of the rotating device, making it non-removable and resistant to high and low temperatures and vibration. Then, install the screw cap 2 onto the bushing 1. After installation, the threaded hole 22 corresponds to the through hole 12. Insert the set screw 4 coated with thread-locking adhesive 6 into the threaded hole 22 of the screw cap 2, pass through the through hole 12 of the bushing 1, and fasten it onto the rotating shaft 3 of the rotating device. The thread-locking adhesive 6 fills the space between the threads of the screw cap 2 and the set screw 4, making it a removable thread-locking adhesive. Then, apply sealing adhesive to the outer end of the set screw 4 to prevent it from loosening and moving backward. Insert the set screw 4 coated with thread-locking adhesive 6 into the through threaded hole 23 on the screw cap and pass through the circular groove 13 on the bushing 1. Then, apply sealing adhesive to both ends of the through threaded hole 23.

[0037] In this embodiment, the axial loosening of the cap 2 is restricted by the set screw 4 at the through threaded hole 23 on the cap 2, and it is secured by the set screw 4 at the through hole 12 on the bushing 1. At the same time, thread-locking adhesive 6 is applied to prevent loosening, and sealing adhesive is applied to prevent detachment.

[0038] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A knob anti-disengagement structure characterized by: include: Bushing (1), bushing (1) is fixedly connected to the rotating shaft (3) on the rotating device by adhesive bonding; The nut (2) is fixedly connected to the bushing (1) by means of mechanical contact interlock.

2. The knob anti-disengagement structure according to claim 1, characterized in that: A gap (11) for filling structural adhesive is provided at the mating point between the bushing (1) and the rotating shaft (3).

3. The knob anti-disengagement structure according to claim 2, characterized in that: The inside of the swivel cap (2) is provided with a groove (21) that matches the bushing (1), and the outside of the bushing (1) and the inside of the groove (21) are provided with an anti-rotation structure (14).

4. The knob anti-disengagement structure according to claim 3, characterized in that: The anti-rotation structure (14) can be any one of the following: D-shaped structure, waist-shaped structure, or square structure.

5. The knob anti-disengagement structure according to claim 3, characterized in that: The bushing (1) has a through hole (12) on its side and the nut (2) has a threaded hole (22) on its side. The threaded hole (22) and the through hole (12) are matched in position and their central axes are collinear.

6. The knob anti-disengagement structure according to claim 5, characterized in that: Set screws (4) coated with threaded adhesive (6) are screwed into the through hole (12) and the threaded hole (22).

7. The knob anti-disengagement structure according to claim 3, characterized in that: A circular groove (13) is provided on the side of the bushing (1), and a through threaded hole (23) is provided on the side of the nut (2). The through threaded hole (23) and the circular groove (13) are matched in position and their central axes are collinear.

8. The knob anti-disengagement structure according to claim 7, characterized in that: A set screw (4) coated with thread-locking adhesive (6) is screwed into the circular groove (13) and the through threaded hole (23).

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