Operation device of knob switch

Abstract

The utility model relates to an operating device of a knob switch, which comprises a knob head and a middle seat, the knob head is detachably mounted on the middle seat, the knob head comprises a cylindrical shell, a hollow cam shaft inserted in the cylindrical shell and a knob arranged in an upper port of the cylindrical shell, a cam part is arranged at the lower end of the hollow cam shaft, and the upper end of the hollow cam shaft is fixedly connected with the knob. A hollow cam shaft is formed at the upper end of the cylinder shell, a plug head extending into the upper end opening of the cylinder shell is formed at the upper end of the hollow cam shaft, a buckle structure is arranged on the plug head, a plug part is formed at the bottom of the knob, a buckle matching structure matched with the buckle structure in a buckled mode is arranged on the plug part, and the plug part of the knob is connected to the plug head of the hollow cam shaft in an inserted mode. The knob is convenient to install.

Description

Technical Field

[0001] The utility model relates to the field of switches, in particular to a knob switch, and more precisely to an operating device on the knob switch. Background Art

[0002] A rotary knob switch typically includes a switch body, a center base, and a knob head. The center base is provided with a mounting hole and a lock catch corresponding to the mounting hole. The knob head comprises a cylindrical shell, a knob, and a hollow camshaft. The hollow camshaft is mounted within the cylindrical shell. The lower end of the hollow camshaft forms a cam portion for pressing a switch button on the switch body. The upper end of the hollow shaft is fixedly connected to the knob. The lower end of the cylindrical shell of the knob head is mounted in the mounting hole of the center base and is locked and unlocked by the lock catch. The center base is snap-fastened to the switch body. However, in existing rotary knob switches, the knob and hollow camshaft are connected using bolts (such as the push button switch structure disclosed in application number 201620484120.8). Specifically, a screw hole is provided in the knob, and a connecting hole is provided at the top end of the hollow camshaft. A bolt passes through the connecting hole and connects to the screw hole. With this structural design, the knob needs to be secured to the camshaft by tightening a screw through the bottom end of the hollow camshaft using a tool, making assembly extremely inconvenient and reducing product assembly efficiency. Furthermore, this structural design makes it difficult to arrange lighting within the hollow camshaft due to the obstruction of the screw, and the knob also presents the drawback of inconveniently designing the indicator light. Summary of the Invention

[0003] The purpose of the invention of the utility model is to overcome the defects of the prior art and provide an operating device for a knob switch with an easy-to-install knob.

[0004] To achieve the above objectives, the present invention provides the following technical solutions:

[0005] A rotary switch operating device comprises a button head and a middle seat, wherein the button head is detachably mounted on the middle seat, the button head comprises a cylindrical shell, a hollow camshaft inserted in the cylindrical shell, and a knob arranged in the upper end of the cylindrical shell, the lower end of the hollow camshaft is provided with a cam portion, and the upper end of the hollow camshaft is fixedly connected to the knob, characterized in that: the upper end of the hollow camshaft is formed with a plug portion extending into the upper end of the cylindrical shell, the plug portion is provided with a snap structure, the bottom of the knob is formed with a plug portion, the plug portion is provided with a snap-fit structure that snaps with the snap structure, and the plug portion of the knob is plugged into the plug portion of the hollow camshaft.

[0006] Preferably, the plug connector is hollow, the plug connection portion is sleeve-shaped, and the plug connector is inserted into the sleeve cavity of the plug connection portion.

[0007] Preferably, the knob is provided with a light-transmitting hole connected to the sleeve cavity of the plug-in part, the outer end of the light-transmitting hole is provided with a light-transmitting cover, and the top end of the plug part has a light-transmitting part, which corresponds to the light-transmitting hole.

[0008] Preferably, an indicator light module is spliced at the bottom of the middle seat, and the indicator light module includes a lamp holder installed on the middle seat, and an indicator light assembly is provided on the lamp holder. The indicator light assembly includes a lamp board and wiring terminals connected to the lamp board, and the lamp beads on the lamp board are inserted into the hollow cavity of the hollow cam shaft. A switch touch rod is positioned and slidably provided on the lamp holder, and the top end of the switch touch rod corresponds to the cam part, and the lower end of the switch touch rod is the switch touch end. An avoidance hole corresponding to the position of the switch touch end is provided at the bottom of the lamp holder.

[0009] Preferably, the lamp holder is provided with a lamp bead protection sleeve, the lamp bead protection sleeve is inserted into the hollow cavity of the hollow camshaft, and the lamp bead pins on the lamp board are placed in the lamp bead protection sleeve.

[0010] Preferably, the outer wall of the plug connector has a positioning plane, the snap-fit structure is a clamping head formed on the positioning plane, the inner wall of the sleeve cavity of the plug connector is provided with a positioning mating surface that is positioned and matched with the positioning plane, and the snap-fit structure is a clamping hole provided on the positioning mating surface.

[0011] Preferably, two relatively arranged positioning planes are provided on the plug part, and the inner wall of the sleeve cavity of the corresponding plug part has two positioning matching surfaces that respectively correspond to the positioning planes. The positioning planes are stepped, and the plane at the upper end of the positioning planes is lower than the plane at the lower end. The head end of the plug part forms a small end, and the corresponding positioning matching surfaces are stepped to match the positioning planes. The surface of the positioning matching surfaces corresponding to the sleeve cavity mouth of the plug part is lower than the surface located on the inner side of the sleeve cavity, and the sleeve cavity mouth of the plug part forms a flared opening.

[0012] Preferably, an annular stainless steel sheet is provided inside the upper port of the cylindrical shell, and the knob is supported on the stainless steel sheet.

[0013] By adopting the above technical solution, the knob can be directly plugged into and installed on the hollow camshaft along the upper end of the barrel shell. After being plugged into place, the knob is securely fixed to the top of the hollow camshaft through the snap-fit structure and the snap-fit structure. This changes the traditional assembly method of the knob and the hollow camshaft, not only changing the direction of the assembly operation of the knob and the hollow camshaft, but also eliminating the need for tools to perform the assembly operation, making assembly more convenient, improving assembly efficiency, and ensuring that the knob and the hollow camshaft are firmly and reliably installed. In addition, the elimination of screw installation reduces costs. On the other hand, this design also eliminates the problem of screw obstruction, allowing for a light-transmitting design, making it easier to install indicator lights.

[0014] The present invention will be further described below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural diagram of a knob switch according to a first embodiment of the present invention;

[0016] Figure 2 This is a schematic diagram of the structure of the button head of the utility model;

[0017] Figure 3 for Figure 2 Sectional view along AA;

[0018] Figure 4 This is an exploded view of the button head of the utility model;

[0019] Figure 5 This is a schematic structural diagram of the hollow camshaft of the utility model;

[0020] Figure 6 This is a schematic diagram of the structure of the knob of the utility model;

[0021] Figure 7 This is a structural diagram of a knob switch according to a second embodiment of the present invention;

[0022] Figure 8 This is a structural diagram of the operating device of the knob switch in the second embodiment of the present utility model;

[0023] Figure 9 for Figure 8 Cross-sectional view taken along BB. DETAILED DESCRIPTION Example 1

[0024] See attached Figures 1 to 6The present invention discloses a rotary switch, comprising a switch body 1 at the bottom, an operating device assembled on the top of the switch body 1, the operating device comprising a middle seat 3 and a button head 2, the middle seat 3 being mounted on the switch body 1, the button head 2 being detachably mounted on the middle seat 3, the button head 2 comprising a cylindrical shell 21, a hollow cam shaft 22 inserted in the cylindrical shell 21, and a knob 23 disposed in the upper end of the cylindrical shell 1, the lower end of the hollow cam shaft 22 being provided with a cam portion 221, the cam portion 221 being used to touch and press the switch body 1 The switch button and the upper end of the hollow camshaft 22 are fixedly connected to the knob 23. The upper end of the hollow camshaft 22 is formed with a plug portion 222 that extends into the upper end of the cylinder shell 21. The plug portion 222 is provided with a snap-fit structure. The bottom of the knob 23 is formed with a plug portion 231. The plug portion 231 is provided with a snap-fit structure that snaps with the snap-fit structure. The plug portion 21 of the knob 23 is plugged into the plug portion 222 of the hollow camshaft 22 and then locked by the snap-fit structure and the snap-fit structure. The knob is directly plugged into and installed on the hollow camshaft along the upper end of the cylinder shell. After being plugged into place, the knob is securely fixed to the top end of the hollow camshaft through the snap-fit structure and the snap-fit structure. This changes the traditional assembly method of the knob and hollow camshaft, not only changing the direction of the knob and hollow camshaft assembly operation, but also eliminating the need for tools to achieve assembly, making assembly more convenient and improving assembly efficiency. In addition, screw installation is eliminated, reducing costs. The upper end of the cylindrical shell 21 is padded with an annular stainless steel sheet 24, and the knob 23 is supported on the stainless steel sheet 24. The stainless steel sheet 24 supports the knob 23, making the knob rotate more smoothly, preventing excessive wear caused by contact between the plastic parts between the knob and the cylindrical shell 21, and improving the service life.

[0025] The plug connector 222 is hollow, and the plug connector 231 is sleeve-shaped. The plug connector 222 is inserted into the sleeve cavity of the plug connector 231, which facilitates the molding of the plug connector and the plug connector.

[0026] In addition, the outer wall of the plug portion 222 has a positioning flat surface 2221. Two opposing positioning flat surfaces 2221 are provided on the plug portion 222. The snap-fit structure is a snap head 2222 formed on the positioning flat surfaces 2221. The inner wall of the sleeve cavity of the plug portion 231 is provided with a positioning mating surface 2311 that mates with the positioning flat surface 2221. The snap-fit structure is a snap hole 2312 provided on the positioning mating surface 2311. This allows for simple and reliable positioning and connection of the knob to the hollow camshaft, while ensuring synchronous rotation of the knob and the hollow camshaft. The structure is simple and easy to manufacture. At the same time, the positioning plane 2221 is in a stepped shape, and the plane 2221a at the upper end of the positioning plane 2221 is lower than the plane 2221b at the lower end, so that the head end of the plug part 222 is formed in a smaller size, and the corresponding positioning matching surface 2311 is in a stepped shape adapted to the positioning plane. The positioning matching surface 2311 corresponds to the surface 2311a of the sleeve cavity mouth of the plug-in part 231, which is lower than the surface 2311b located on the inner side of the sleeve cavity, so that the sleeve cavity mouth of the plug-in part is expanded, which further makes it easier to socket the knob and the hollow camshaft.

[0027] The hollow design of the connector facilitates light transmission. Specifically, the knob 23 is provided with a light-transmitting cavity 230 connected to the sleeve cavity of the plug portion 231. The outer end of the light-transmitting cavity 230 is provided with a light-transmitting cover 232, which is snap-fastened to the knob 23. The light-transmitting cover 232 can be selected in a desired color. The top of the connector 222 has a light-transmitting portion 2223, which mates with the light-transmitting cavity 230. In this embodiment, the top of the connector is closed, and the hollow camshaft is made of a transparent material, thereby making the top of the connector transparent, allowing light to pass through. Of course, the light-transmitting portion 2223 can also be a through-hole. Specific embodiment 2

[0028] like Figures 2 to 9 The knob switch of this embodiment differs from the knob switch of the first embodiment only in that, on the basis of the hollow cam shaft and the knob having a light-transmitting structure design, an additional indicator light module (see Figure 1 and Figure 7), thereby realizing a knob switch with an indicator light; in order to better illustrate this specific embodiment, the same structural design as that in the specific embodiment 2 and the specific embodiment 1 will not be described in detail; the structure of the processed indicator light is as follows: an indicator light module 4 is spliced at the bottom of the middle seat 3, and the indicator light module 4 includes a lamp holder 41 mounted on the middle seat 3. The lamp holder 41 is provided with an indicator light assembly, and the indicator light assembly includes a lamp board 42 and a terminal 40 connected to the lamp board 42. The lamp bead 421 on the lamp board 42 is inserted into the hollow cavity of the hollow cam shaft 22. After the lamp holder is added, in order to achieve the key matching between the hollow cam shaft 22 and the switch body, a switch touch rod 43 is positioned and slidably provided on the lamp holder 41. The top end of the switch touch rod 43 corresponds to the cam portion 221, and the lower end of the switch touch rod 43 is a switch touch end 431. The bottom of the lamp holder 41 is provided with an avoidance hole 411 corresponding to the position of the switch touch end 431, so that the hollow cam shaft presses the button of the switch body through the switch touch rod.

[0029] Furthermore, the lamp holder 41 is provided with a lamp bead protection sleeve 412, which is inserted into the hollow cavity of the hollow camshaft 21, and the lamp bead pins 422 on the lamp board are placed in the lamp bead protection sleeve 412. This protects the lamp bead and facilitates the installation of the indicator light module on the middle seat.

Claims

1. A rotary switch operating device comprising a knob head and a center seat, wherein the knob head is detachably mounted on the center seat, the knob head comprising a cylindrical shell, a hollow cam shaft inserted into the cylindrical shell, and a knob disposed in an upper end of the cylindrical shell, wherein the lower end of the hollow cam shaft is provided with a cam portion, and the upper end of the hollow cam shaft is fixedly connected to the knob, characterized in that: The upper end of the hollow camshaft is formed with a plug connector that extends into the upper port of the cylinder shell, and the plug connector is provided with a snap structure. The bottom of the knob is formed with a plug-in portion, and the plug-in portion is provided with a snap-fitting structure that snaps with the snap-fitting structure. The plug-in portion of the knob is plugged into the plug connector of the hollow camshaft.

2. The operating device of the knob switch according to claim 1, characterized in that: The plug connector is hollow, the plug connection portion is in the shape of a sleeve, and the plug connector is inserted into the sleeve cavity of the plug connection portion.

3. The operating device of the rotary switch according to claim 2, characterized in that: The knob is provided with a light-transmitting hole connected to the sleeve cavity of the plug part, the outer end of the light-transmitting hole is provided with a light-transmitting cover, the top of the plug part has a light-transmitting part, and the light-transmitting part corresponds to the light-transmitting hole.

4. The operating device of the rotary switch according to claim 3, characterized in that: An indicator light module is spliced onto the bottom of the middle seat. The indicator light module includes a lamp holder mounted on the middle seat. The lamp holder is provided with an indicator light assembly. The indicator light assembly includes a lamp board and wiring terminals connected to the lamp board. The lamp beads on the lamp board are inserted into the hollow cavity of the hollow cam shaft. A switch touch rod is positioned and slidably provided on the lamp holder. The top end of the switch touch rod corresponds to the cam portion. The lower end of the switch touch rod is the switch touch end. An avoidance hole corresponding to the position of the switch touch end is provided at the bottom of the lamp holder.

5. The operating device of the rotary switch according to claim 4, characterized in that: The lamp holder is provided with a lamp bead protection sleeve, which is inserted into the hollow cavity of the hollow cam shaft, and the lamp bead pins on the lamp board are placed in the lamp bead protection sleeve.

6. The operating device of the rotary switch according to claim 2, characterized in that: The outer wall of the plug connector has a positioning plane, the snap-fit structure is a clamping head formed on the positioning plane, the inner wall of the sleeve cavity of the plug connector is provided with a positioning matching surface that is positioned and matched with the positioning plane, and the snap-fit structure is a clamping hole provided on the positioning matching surface.

7. The operating device of the rotary switch according to claim 6, characterized in that: Two relatively arranged positioning planes are provided on the plug part, and the inner wall of the sleeve cavity of the corresponding plug part has two positioning matching surfaces that correspond to the positioning planes one by one. The positioning planes are stepped, and the plane at the upper end of the positioning planes is lower than the plane at the lower end. The head end of the plug part forms a small end, and the corresponding positioning matching surfaces are stepped to match the positioning planes. The surface of the positioning matching surface corresponding to the sleeve cavity mouth of the plug part is lower than the surface located on the inner side of the sleeve cavity, and the sleeve cavity mouth of the plug part forms a flared opening.

8. The operating device of the knob switch according to claim 1, characterized in that: An annular stainless steel sheet is provided in the upper port of the cylindrical shell, and the knob is supported on the stainless steel sheet.

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