Positioning plastic knob

Abstract

The utility model relates to a positioning type plastic knob in the field of knob, including base, screw cap and adjusting device, the inside of screw cap is provided with the synchronous sleeve coaxial with the rotation bar, and the rotation bar extends to the inside synchronous sleeve, the inside of synchronous sleeve is provided with synchronous gear ring, the surface of rotation bar is connected with synchronous gear, and synchronous gear ring can engage with synchronous gear, and the base is provided with the annular groove coaxial with the rotation bar, and the annular groove is provided with the elastic reset member and the connecting ring of installation, the inner wall of screw cap is provided with the connecting sleeve, the connecting ring is connected with annular groove slidingly, the connecting ring can rotate in annular groove along the inner wall relative to the base, the connecting sleeve extends to annular groove and is connected with the elastic reset member, and the elastic reset member sets up at the one end of connecting ring away from the connecting sleeve, screw cap can move up and down relative to the base, screw cap must be pressed downward along the axial direction, make synchronous gear ring in the synchronous sleeve and synchronous gear on the rotation bar engage, and only then rotation operation can be transmitted to adjusting device.

Description

Technical Field

[0001] This utility model relates to the field of knobs, and in particular to a positioning plastic knob. Background Technology

[0002] Knobs, as common human-machine interface components, are widely used in home appliances, instruments, and industrial control to achieve operations such as parameter adjustment and function switching. Traditional positioning plastic knobs typically consist of a base, a rotatable cap, and an internal adjustment mechanism (such as an encoder or potentiometer). Users directly drive the lever of the adjustment mechanism by rotating the cap, thereby changing the output signal or mechanical position. This type of knob has become the mainstream design due to its simple structure and low cost.

[0003] The caps of existing knobs are often exposed and directly linked to the adjustment device. During transportation, equipment movement, or accidental collisions, they are easily touched by external forces, resulting in unintended rotation, or "accidental touch." Such accidental touches can lead to unexpected changes in equipment parameters, affecting user experience at best, and causing equipment malfunctions or even safety accidents at worst. This is especially problematic in scenarios requiring high adjustment precision or prevention of accidental operation, such as medical equipment and precision instruments. Utility Model Content

[0004] In order to overcome the shortcomings of existing technical solutions, this utility model provides a positioning plastic knob, which can effectively solve the technical problem of easy accidental activation.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] A positioning plastic knob includes a base, a knob cap, and an adjustment device. The adjustment device is fixedly installed inside the base. The pins and rod of the adjustment device extend to the outside of the base. The knob cap can be connected to the rod of the adjustment device. The knob cap is rotatably connected to the base. A synchronous sleeve coaxial with the rod is provided inside the knob cap. The rod extends into the synchronous sleeve. A synchronous gear ring is provided inside the synchronous sleeve. A synchronous gear is connected to the surface of the rod. The synchronous gear ring can mesh with the synchronous gear. The base is provided with an annular groove coaxial with the rod. An elastic reset member and a connecting ring are installed in the annular groove. A connecting sleeve is provided on the inner wall of the knob cap. The connecting ring is slidably connected to the annular groove. The connecting ring can rotate relative to the base along the inner wall of the annular groove. The connecting sleeve extends into the annular groove and is connected to the elastic reset member. The elastic reset member is provided at the end of the connecting ring away from the connecting sleeve. The knob cap can move up and down relative to the base.

[0007] Furthermore, the side wall of the synchronizing sleeve is provided with a positioning gear, and the inner wall of the base is provided with a positioning toothed ring. The positioning toothed ring can engage with the positioning gear, and the positioning gear and the synchronizing toothed ring are at the same height. The positioning toothed ring is located above the synchronizing gear.

[0008] Furthermore, the connecting ring is magnetically connected to the connecting sleeve.

[0009] Furthermore, a limiting cover is installed on the surface of the base to cover the opening of the annular groove. The limiting cover only covers the outer side of the opening of the annular groove, and a clearance opening is provided in the center of the limiting cover. The connecting sleeve extends through the clearance opening into the annular groove.

[0010] Furthermore, the base is provided with a downward-facing mounting cavity, the adjustment device is fixedly installed in the mounting cavity, and a positioning cover is provided at the bottom of the base, with the pins of the adjustment device passing through the positioning cover to the bottom of the base.

[0011] Furthermore, the side wall of the base is provided with a connecting base plate for fixing the knob, and the surface of the connecting base plate is provided with mounting holes.

[0012] Compared with existing technologies, the advantages of this invention are as follows: the nut must be pressed downwards axially to engage the synchronous gear ring inside the synchronous sleeve with the synchronous gear on the rotary rod before rotational operation can be transmitted to the adjustment device. Under normal conditions, the elastic reset element forces the nut upwards, keeping the synchronous gear ring and synchronous gear separated, forming a physical isolation. This design completely solves the problem of accidental activation caused by the direct linkage of the exposed nut in traditional knobs. Through the cooperation of the elastic reset element in the ring groove with the connecting ring and connecting sleeve, the nut automatically resets to the gear separation position after being released. This reset process requires no additional operation, and the separation state is stable and reliable, ensuring that the risk of accidental activation is absolutely avoided during non-operational periods. Attached Figure Description

[0013] Figure 1 This is the front view of the present invention;

[0014] Figure 2 This is a schematic diagram of the structure of this utility model;

[0015] The following are the labels in the diagram: 1-Base, 2-Swivel cap, 3-Adjusting device, 301-Swivel rod, 302-Pin, 4-Synchronous sleeve, 5-Synchronous gear ring, 6-Synchronous gear, 7-Connecting sleeve, 8-Ring groove, 9-Connecting ring, 10-Elastic reset component, 11-Limit cover, 12-Connecting base plate, 13-Positioning gear, 14-Positioning gear ring. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] The following is combined with Figures 1-2 A detailed description of a positioning plastic knob of this utility model is provided:

[0018] A positioning plastic knob includes a base 1, a knob cap 2, and an adjusting device 3. The adjusting device 3 is fixedly installed inside the base 1. The pin 302 and the rotating rod 301 of the adjusting device 3 extend to the outside of the base 1. The knob cap 2 can be connected to the rotating rod 301 of the adjusting device 3. The knob cap 2 is rotatably connected to the base 1. A synchronization sleeve 4, coaxial with the rotating rod 301, is provided inside the knob cap 2. The rotating rod 301 extends into the synchronization sleeve 4. A synchronization gear ring 5 is provided inside the synchronization sleeve 4. A synchronization gear 6 is connected to the surface of the rotating rod 301. Ring 5 can mesh with synchronous gear 6. Base 1 is provided with an annular groove 8 coaxial with rotating rod 301. An annular groove 8 is provided with an elastic reset member 10 and a connecting ring 9. The inner wall of the rotating cap 2 is provided with a connecting sleeve 7. The connecting ring 9 is slidably connected to the annular groove 8. The connecting ring 9 can rotate relative to base 1 along the inner wall of the annular groove 8. The connecting sleeve 7 extends into the annular groove 8 and connects with the elastic reset member 10. The elastic reset member 10 is provided at the end of the connecting ring 9 away from the connecting sleeve 7. The rotating cap 2 can move up and down relative to base 1. The elastic reset member 10 is a spring.

[0019] The nut 2 must be pressed downwards axially to engage the synchronous gear ring 5 inside the synchronous sleeve 4 with the synchronous gear 6 on the rotary rod 301 before rotational operation can be transmitted to the adjustment device 3. Under normal conditions, the elastic reset element 10 forces the nut 2 upwards, keeping the synchronous gear ring 5 and synchronous gear 6 separated, forming a physical isolation. This design completely solves the problem of accidental activation caused by the direct linkage of the exposed nut 2 in traditional knobs. Through the cooperation of the elastic reset element 10 in the annular groove 8 with the connecting ring 9 and the connecting sleeve 7, the nut 2 automatically resets to the gear separation position after being released. This reset process requires no additional operation, and the separation state is stable and reliable, ensuring that the risk of accidental activation is absolutely avoided during non-operational periods.

[0020] The side wall of the synchronous sleeve 4 is provided with a positioning gear 13, and the inner wall of the base 1 is provided with a positioning gear ring 14. The positioning gear ring 14 can engage with the positioning gear 13. The positioning gear 13 and the synchronous gear ring 5 are at the same height. The positioning gear ring 14 is located above the synchronous gear 6. After the positioning gear ring 14 engages with the positioning gear 13, the nut 2 cannot rotate. Under normal conditions, the engagement of the positioning gear 13 and the positioning gear ring 14 forms a circumferential mechanical lock, completely eliminating the possibility of the nut 2 rotating accidentally due to external force. When separated from the gear, it provides "axial + circumferential" double protection against accidental contact. During the pressing operation, the positioning gear 13 and the positioning gear ring 14 disengage synchronously, ensuring that the rotation command is transmitted without delay and the smoothness of operation is not affected.

[0021] The connecting ring 9 and the connecting sleeve 7 are magnetically connected. The magnetic attraction achieves non-rigid coupling between the connecting ring 9 and the connecting sleeve 7. The screw cap 2 can be quickly disassembled and assembled by hand, which is convenient for replacement or maintenance. The magnetic connection maintains the reliability of force transmission when axially pressed, does not affect the reset function, and avoids the failure risk caused by easy wear of traditional buckle structures.

[0022] A limiting cover 11 is installed on the surface of the base 1 to cover the opening of the annular groove 8. The limiting cover 11 is threaded to the base 1. The limiting cover 11 only covers the outside of the opening of the annular groove 8. A clearance opening is provided in the center of the limiting cover 11. The connecting sleeve 7 extends into the annular groove 8 through the clearance opening. The limiting cover 11 prevents the connecting ring 9 from separating from the annular groove 8. The limiting cover 11 partially covers the opening of the annular groove 8, effectively preventing the connecting ring 9 from coming out of the annular groove 8 during repeated axial movement, thereby improving the durability of the mechanism.

[0023] The base 1 has a downward-facing mounting cavity. The adjustment device 3 is located in the mounting cavity. A positioning cover is provided at the bottom of the base 1. The positioning cover is threadedly connected to the base 1. The pin 302 of the adjustment device 3 passes through the positioning cover to the bottom of the base 1. The positioning cover fixes the adjustment device 3 in the mounting cavity. The adjustment device 3 achieves top-loading assembly through the downward-facing mounting cavity. It forms a closed and fixed structure with the bottom positioning cover, which significantly improves production assembly efficiency. The structure of the pin 302 extending through the positioning cover is compatible with standard circuit board insertion technology and does not require changes to the original interface design of the equipment.

[0024] The base 1 has a connecting base plate 12 for fixing the knob on its side wall. The surface of the connecting base plate 12 has mounting holes. The connecting base plate 12 provides multi-directional fixing points through the mounting holes, supports various installation methods such as screws and buckles, and is suitable for different equipment panel thicknesses and materials. The force on the base 1 is distributed to the connecting base plate 12, which reduces the mechanical stress on the adjustment device 3 caused by the knob operation and extends the overall service life.

[0025] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A positioning plastic knob, comprising a base, a knob cap, and an adjusting device, wherein the adjusting device is fixedly installed inside the base, the pins and the rotating rod of the adjusting device extend to the outside of the base, the knob cap can be connected to the rotating rod of the adjusting device, and the knob cap is rotatably connected to the base, characterized in that: The inner side of the rotating cap is provided with a synchronous sleeve coaxial with the rotating rod. The rotating rod extends into the synchronous sleeve, and a synchronous gear ring is provided inside the synchronous sleeve. A synchronous gear is connected to the surface of the rotating rod, and the synchronous gear ring can mesh with the synchronous gear. The base is provided with an annular groove coaxial with the rotating rod. The annular groove is provided with an elastic reset member and a connecting ring. The inner wall of the rotating cap is provided with a connecting sleeve. The connecting ring is slidably connected to the annular groove. The connecting ring can rotate relative to the base along the inner wall of the annular groove. The connecting sleeve extends into the annular groove and connects with the elastic reset member. The elastic reset member is provided at the end of the connecting ring away from the connecting sleeve. The rotating cap can move up and down relative to the base.

2. The positioning plastic knob according to claim 1, characterized in that: The side wall of the synchronizing sleeve is provided with a positioning gear, and the inner wall of the base is provided with a positioning toothed ring. The positioning toothed ring can engage with the positioning gear. The positioning gear and the synchronizing toothed ring are at the same height, and the positioning toothed ring is located above the synchronizing gear.

3. A positioning plastic knob according to claim 1, characterized in that: The connecting ring is magnetically connected to the connecting sleeve.

4. A positioning plastic knob according to claim 1, characterized in that: The base is fitted with a limiting cover that covers the opening of the annular groove. The limiting cover only covers the outside of the opening of the annular groove. A clearance opening is provided in the center of the limiting cover, and the connecting sleeve extends through the clearance opening into the annular groove.

5. A positioning plastic knob according to any one of claims 1-4, characterized in that: The base has a downward-facing mounting cavity, and the adjustment device is fixedly installed in the mounting cavity. The bottom of the base has a positioning cover, and the pins of the adjustment device pass through the positioning cover to the bottom of the base.

6. A positioning plastic knob according to any one of claims 1-4, characterized in that: The base has a connecting plate on its side wall for fixing the knob, and the surface of the connecting plate has mounting holes.

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