Inductance type key

Abstract

The utility model discloses an inductance type key, which is used for triggering an inductance element to generate a switching signal and comprises a bottom plate, a key seat, a reset spring and a pressing handle capable of moving up and down in the key seat, the inductance element is arranged on the bottom plate, a metal conductor is arranged at the bottom of the pressing handle, and the inductance element is of a hollow cylinder structure with the length larger than the pressed stroke of the pressing handle; when the pressing handle is pressed, the pressing handle overcomes the tension of the reset spring to move downwards, so that the metal conductor approaches and is inserted into the inductance element to move, and the inductance value of the inductance element is changed to generate a signal. An independent and separable inductance element is installed on a bottom plate, precise switch control is achieved through interaction of a metal conductor and the inductance element, arrangement of an inductance coil is changed, a three-dimensional coil is adopted, and the metal conductor is higher in induction efficiency and sensitive in response; in addition, the structure is convenient to install, the machining efficiency can be improved, the structure is stable and reliable, and safety is high.

Description

Technical Field

[0001] The utility model relates to the field of key switches, in particular to an inductive key. Background Art

[0002] Inductive buttons are non-contact buttons that work based on the principle of electromagnetic induction. An inductive button contains an inductor coil (or sensor coil). When a metal object approaches this coil, eddy currents are generated inside the metal object. This eddy current in turn affects the magnetic field of the inductor coil, causing the inductance of the coil to change. Inductive buttons determine the proximity of metal objects by detecting the change in inductance and trigger the switch action accordingly.

[0003] Patent No. "202323025276.9" proposes a push switch assembly, in which an inductive element is arranged on a PCB board, and a through-hole is opened on the PCB board for the magnetic core to pass through, and the inductive element is arranged around the through-hole. In this arrangement, the inductive element needs to be precisely arranged around the through-hole, which increases the complexity and difficulty of PCB design. In addition, the inductive element will generate heat when working. If the heat dissipation is not good, the temperature may rise, affecting the performance and stability of the element. Utility Model Content

[0004] In view of the above problems, the utility model aims to provide an inductive key which is easy to install and can generate an inductive signal more stably and sensitively.

[0005] To achieve the technical purpose, the solution of the utility model is: an inductive key, used to trigger an inductive element to generate a switch signal, including a base plate, a key seat, a reset spring and a handle that can move up and down in the key seat, the inductive element is installed on the base plate, and a metal conductor is provided at the bottom of the handle. The inductive element is a hollow cylindrical structure with a length greater than the stroke of the handle being pressed; when the handle is pressed, the handle overcomes the tension of the reset spring and moves downward, causing the metal conductor to approach and insert into the inductive element and move, thereby causing the inductance value of the inductive element to change and generate a signal.

[0006] Preferably, the inductor element comprises a fixing part and an inductor coil sleeved outside the fixing part, the base plate is provided with a through hole for inserting the inductor coil, the top of the fixing part is provided with a mounting convex ring, the lower part of the inductor element passes through the through hole and is fixed to the base plate by the mounting convex ring.

[0007] Preferably, the inductive key further includes an independent T-shaped trigger shaft, which is a metal conductor as a whole. The trigger shaft consists of a shaft top and a shaft body, and the trigger shaft abuts against the bottom center position of the handle with the shaft top; a guide cavity is provided on the key base, and the shaft body can be assembled in the guide cavity so as to move up and down; the reset spring is sleeved outside the shaft body, one end of the reset spring abuts against the key base, and the other end abuts against the bottom of the shaft top.

[0008] Preferably, the inductive key further includes an independent T-shaped trigger shaft, the metal conductor is fixed on the trigger shaft, the trigger shaft consists of a shaft top and a shaft body, and the trigger shaft abuts against the bottom center position of the handle with the shaft top; a guide cavity is provided on the key base, and the shaft body can be assembled in the guide cavity so as to move up and down; the reset spring is sleeved outside the shaft body, one end of the reset spring abuts against the key base, and the other end abuts against the bottom of the shaft top.

[0009] Preferably, the trigger shaft is made of non-metallic material, and has a groove in it. The metal conductor is installed in the groove, and the length of the metal conductor is greater than the stroke of the handle being pressed.

[0010] Preferably, the inner wall of the key base and the outer wall of the button handle are provided with mutually matching guide structures, and the button handle moves stably up and down along the inner wall of the key base through the guide structure.

[0011] Preferably, a pair of anti-detachment hooks are provided on the outer wall of the push handle, and hook grooves are provided in the key base corresponding to the positions of the anti-detachment hooks. When the push handle is reset, the anti-detachment hooks are stopped by the hook grooves and cannot continue to move upward.

[0012] Preferably, limiting grooves are respectively provided on the inner corners of the key base, and the outer corners of the handle match the limiting grooves.

[0013] Preferably, it further comprises an upper cover, which is sleeved on the key base to limit the upward movement of the button handle.

[0014] The beneficial effects of the present invention are: an independent and separable inductor element is installed on the base plate, precise switch control is achieved through the interaction between the metal conductor and the inductor element, the layout of the inductor coil is changed, and a three-dimensional coil is adopted, and the metal conductor has higher induction efficiency and sensitive response; in addition, the structure of the present application is easy to install, which is beneficial to improving processing efficiency, and the structure is stable and reliable with high safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the utility model;

[0016] Figure 2 It is an exploded view of a specific embodiment 1 of the utility model;

[0017] Figure 3It is a cross-sectional view of a specific embodiment 1 of the utility model in a pressed state;

[0018] Figure 4 It is a cross-sectional view of a specific embodiment 1 of the utility model in a non-pressed state;

[0019] Figure 5 It is an exploded view of the second specific embodiment of the utility model;

[0020] Figure 6 It is a cross-sectional view of the second specific embodiment of the utility model;

[0021] Figure 7 The position relationship between the trigger shaft and the inductor element in the utility model is Figure 1 ;

[0022] Figure 8 The position relationship between the trigger shaft and the inductor element in the utility model is Figure 2 ;

[0023] Fig. 9 It is a schematic diagram of the assembly of the inductor element in the utility model.

[0024] In the figure: 1. push handle; 101. anti-unhooking; 2. trigger shaft; 201. shaft top; 202. shaft body; 3. metal conductor; 4. reset spring; 5. key base; 501. hook groove; 6. inductor element; 601. fixing piece; 602. mounting convex ring; 603. inductor coil; 7. bottom plate; 701. through hole; 8. upper cover. DETAILED DESCRIPTION

[0025] The utility model is further described in detail below in conjunction with the accompanying drawings and specific embodiments. In order to clearly and completely describe the technical solution, the following embodiments are selected for illustration; the following embodiments are part of the embodiments of the utility model; based on this application, other embodiments obtained without creative work are all within the scope of protection of the utility model.

[0026] In the following embodiments, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", "top / bottom" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of clearly describing the present embodiment, rather than indicating or implying that the device or element referred to must have a specific direction, and therefore cannot be understood as a limitation on the present application. At the same time, "first" and "second" in the embodiments are only used for distinguishing description purposes, and do not represent or imply relative importance.

[0027] like Figure 1-9As shown, the specific embodiment of the utility model is an inductive key, which is used to trigger the inductive element 6 to generate a switch signal, including a bottom plate 7, a key base 5, a reset spring 4 and a handle 1 that can move up and down in the key base 5. The inductive element 6 is installed on the bottom plate 7. In order to increase the stability of the key, it also includes an independent T-shaped trigger shaft 2, which is composed of a shaft top 201 and a shaft body 202. The trigger shaft 2 is abutted against the bottom center position of the handle 1 with the shaft top 201; a guide cavity is provided on the key base 5, and the shaft body 202 can be assembled in the guide cavity so as to move up and down;

[0028] The reset spring 4 is sleeved outside the shaft body 202, one end of the reset spring 4 abuts on the key seat 5, and the other end abuts on the bottom of the shaft top 201; the trigger shaft 2 has a section of metal conductor 3, and the length of the inductance element 6 is greater than the stroke of the handle 1 being pressed; when the handle 1 is pressed, the handle 1 drives the trigger shaft 2 to overcome the tension of the reset spring 4 and move downward, so that the metal conductor 3 approaches and inserts into the inductance element 6 to move, thereby changing the inductance value of the inductance element 6 to generate a signal. The inductance element 6 is a hollow cylindrical structure with a length greater than the stroke of the handle 1 being pressed, and the full movement of the metal conductor 3 in the inductance element 6 can change the inductance value of the inductance element 6.

[0029] The inductor element 6 includes a fixing part 601 and an inductor coil 603 sleeved outside the fixing part 601. A through hole 701 is provided on the bottom plate 7 for inserting the inductor coil 603. A mounting convex ring 602 is provided on the top of the fixing part 601 to ensure the stable installation of the inductor element 6. The outer diameter of the mounting convex ring 602 is larger than the diameter of the through hole 701. The lower part of the inductor element 6 passes through the through hole 701 and is fixed to the bottom plate 7 by the mounting convex ring 602. The outer wall of the mounting convex ring 602 is also provided with an abutment portion that can abut on the bottom plate 7. The abutment portion is fixedly installed on the bottom plate by welding or bolt connection, so that the inductor element is stably maintained on the bottom plate without shaking. The inductor coil 603 is cylindrical and can produce a three-dimensional induction effect, making the induction efficiency higher and the induction more sensitive.

[0030] In the present application, the inner wall of the key base 5 and the outer wall of the button handle 1 are provided with mutually matching guiding structures, and the button handle 1 moves stably up and down along the inner wall of the key base 5 through the guiding structure.

[0031] like Figure 2-4As shown, as a specific embodiment 1 of the present application, the button is a button without an upper cover 8. In order to reset and limit the push handle 1, a pair of anti-disconnection hooks 101 are provided on the outer wall of the push handle 1, and a hook groove 501 is provided in the key base 5 at a position corresponding to the anti-disconnection hook 101. When the push handle 1 is reset, the anti-disconnection hook 101 is stopped by the hook groove 501 and cannot continue to move upward. This design ensures that the push handle 1 can return to the initial position when reset. This design prevents the push handle 1 from shaking or shifting during the reset process, and ensures the stability of the trigger signal. Furthermore, in order to enable the push handle 1 to maintain stable and smooth up and down movement, the guide structure in this specific embodiment is as follows: limit grooves are respectively provided on the inner corners of the key base 5, and the outer corners of the push handle 1 match the limit groove 604 to provide precise guidance for the button.

[0032] like Figure 5-6 As shown in the figure, as the second specific embodiment of the present application, it also includes an upper cover 8, which is sleeved on the key base 5 to limit the upward movement of the push handle 1. The guide structure in this specific embodiment includes a guide groove and a guide rail. A stabilizing frame is constructed on the key base 5, and the guide rail is arranged on the stabilizing frame. The stabilizing frame is arranged in two opposite positions on the left and right sides; the guide groove is arranged on the left and right sides of the push handle 1, and the guide groove corresponds to the guide rail on the stabilizing frame one by one, forming a stable sliding system, which can keep the position of the trigger shaft 2 unchanged even when an external force or shaking occurs.

[0033] The metal conductor in the present application can be arranged in two forms, wherein the metal conductor 3 in the present application can be the whole of the trigger shaft 2, such as the trigger shaft 2 is made of the metal conductor 3, and the length of the trigger shaft 2 is greater than the stroke of the handle 1 being pressed. The metal conductor 3 in the present application can also be fixed on the trigger shaft 2, the trigger shaft 2 is made of non-metallic material, the trigger shaft 2 has a groove, the metal conductor 3 is installed in the groove, and the length of the metal conductor 3 is greater than the stroke of the handle 1 being pressed.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any minor modifications, equivalent substitutions and improvements made to the above embodiments based on the technical essence of the present invention should be included in the protection scope of the technical solution of the present invention.

Claims

1. An inductive key, used to trigger an inductive element to generate a switch signal, comprising a base plate, a key seat, a return spring, and a handle that can move up and down in the key seat, wherein the inductive element is mounted on the base plate, and characterized in that: A metal conductor is provided at the bottom of the button handle, and the inductance element is a hollow cylindrical structure with a length greater than the stroke of the button handle being pressed; when the button handle is pressed, the button handle overcomes the tension of the return spring and moves downward, causing the metal conductor to approach and insert into the inductance element and move, thereby causing the inductance value of the inductance element to change and generate a signal.

2. The inductive key according to claim 1, characterized in that: The inductor element comprises a fixing part and an inductor coil sleeved outside the fixing part. A through hole for inserting the inductor coil is provided on the bottom plate. A mounting convex ring is formed on the top of the fixing part. The lower part of the inductor element passes through the through hole and is fixed to the bottom plate by the mounting convex ring.

3. The inductive key according to claim 2, characterized in that: The inductive key also includes an independent T-shaped trigger shaft, which is a metal conductor as a whole. The trigger shaft consists of a shaft top and a shaft body, and the trigger shaft abuts against the bottom center position of the handle with the shaft top; a guide cavity is provided on the key base, and the shaft body can be assembled in the guide cavity so as to move up and down; the reset spring is sleeved outside the shaft body, one end of the reset spring abuts against the key base, and the other end abuts against the bottom of the shaft top.

4. The inductive key according to claim 2, characterized in that: The inductive key also includes an independent T-shaped trigger shaft, the metal conductor is fixed on the trigger shaft, the trigger shaft is composed of a shaft top and a shaft body, and the trigger shaft abuts against the bottom center position of the handle with the shaft top; a guide cavity is provided on the key base, and the shaft body can be assembled in the guide cavity so as to move up and down; the reset spring is sleeved outside the shaft body, one end of the reset spring abuts against the key base, and the other end abuts against the bottom of the shaft top.

5. The inductive key according to claim 4, characterized in that: The trigger shaft is made of non-metallic material and has a groove in it. The metal conductor is installed in the groove. The length of the metal conductor is greater than the stroke of the handle being pressed.

6. The inductive key according to any one of claims 1 to 5, characterized in that: The inner wall of the key base and the outer wall of the push handle are provided with mutually matching guide structures, and the push handle moves up and down stably along the inner wall of the key base through the guide structure.

7. The inductive key according to claim 6, characterized in that: A pair of anti-detachment hooks are arranged on the outer wall of the push handle, and hook grooves are arranged in the key base at positions corresponding to the anti-detachment hooks. When the push handle is reset, the anti-detachment hooks are stopped by the hook grooves and cannot continue to move upward.

8. The inductive key according to claim 7, characterized in that: Limiting grooves are respectively arranged on the inner corners of the key base, and the outer corners of the button handle match the limiting grooves.

9. The inductive key according to claim 6, characterized in that: It also includes an upper cover, which is sleeved on the key base to limit the upward movement of the button handle.

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