Key structure and foot switch device

Abstract

The invention belongs to the technical field of medical equipment, and relates to a key structure and a foot switch device, the key structure comprises a first shell, a button assembly and a circuit assembly; the first shell is provided with a first through hole; the button assembly comprises an elastic pressing piece, the circuit assembly comprises an elastic conductive piece, and the elastic pressing piece and the elastic conductive piece are arranged on the two sides of the first shell respectively and right face the first through hole. The elastic coefficient of the elastic pressing piece is larger than that of the elastic conductive piece, the elastic pressing piece extrudes the elastic conductive piece when being stressed, and the elastic pressing piece rebounds or tends to rebound when the elastic conductive piece deforms to the limiting position. When the elastic pressing piece extrudes the elastic conductive piece, under the condition that the elastic conductive piece deforms to a limit position due to overlarge stress, the elastic pressing piece rebounds or forms a rebounding trend to absorb redundant external force, and the situation that overlarge pressure is continuously applied to the circuit assembly is avoided, so that the risk that the circuit assembly is damaged is reduced, and the circuit assembly is effectively protected.

Description

Technical Field

[0001] The present invention relates to the technical field of medical equipment, and more specifically, to a key structure and a foot switch device. Background Art

[0002] In order to facilitate the doctor's operation, medical equipment is usually equipped with a wireless foot pedal with a key switch inside. During the operation, the doctor triggers the key switch by stepping on the foot pedal to control the program. When the foot pedal is stepped on, the key switch is pressed, and the conductive particles on it contact the circuit on the circuit board to form a closed path. When the foot pedal is released, the key switch rebounds, and the conductive particles on it are separated from the circuit on the circuit board to form an open circuit, thereby realizing the function of the foot switch button.

[0003] The prior art uses a micro switch to control the signal. The layout on the circuit board is relatively complex, and the travel of the key switch is controlled by stepping on the button. The size and direction of the stepping force in this way are uncontrollable. Since the key switch is in direct contact with the circuit board, excessive stepping force can easily cause damage or fall off of components on the circuit board, resulting in pedal failure. Summary of the invention

[0004] The technical problem to be solved by the embodiments of the present invention is that the key structure in the prior art is prone to damage the circuit board.

[0005] In order to solve the above technical problems, an embodiment of the present invention provides a key structure, including a first housing, a button assembly and a circuit assembly;

[0006] The first shell is provided with a first through hole;

[0007] The button assembly includes an elastic pressing member, and the circuit assembly includes an elastic conductive member, wherein the elastic pressing member and the elastic conductive member are respectively arranged on two sides of the first housing and are both arranged facing the first through hole;

[0008] The elastic coefficient of the elastic pressing member is greater than the elastic coefficient of the elastic conductive member. The elastic pressing member squeezes the elastic conductive member when subjected to force, and rebounds or forms a rebound tendency when the elastic conductive member is deformed to an extreme position.

[0009] Furthermore, the elastic conductive member and the elastic pressing member are pre-pressed, and the elastic conductive member is deformed in the pre-pressed state, and the deformation amount is smaller than the deformation amount at the limit position.

[0010] Furthermore, the key structure further comprises a second shell connected to the first shell, and the second shell is provided with a second through hole;

[0011] The button assembly also includes a button and a reset member;

[0012] One end of the button is connected to the elastic pressing member, and the other end passes through the second through hole and extends out of the second shell. Two ends of the reset member abut against the button and the first shell respectively.

[0013] Furthermore, a central guide column is provided on one side of the button facing the first housing;

[0014] The elastic pressing piece is provided with a top ring, one end of the elastic pressing piece is inserted into the central guide column, and the top ring abuts against the end surface of the central guide column;

[0015] One end of the reset member is sleeved on the central guide column.

[0016] Furthermore, the first shell has a limiting portion arranged around or partially around the first through hole, and the other end of the reset member is sleeved on the limiting portion.

[0017] Furthermore, the circuit assembly further comprises a circuit board, and the first housing, the elastic conductive member and the circuit board are connected in sequence;

[0018] The elastic conductive member has a concave portion on one side facing the circuit board, and the concave portion forms a deformation space for the elastic conductive member.

[0019] Furthermore, in the longitudinal section of the recessed portion, an angle between a wall surface of the recessed portion and an extension line of an end surface is 15° to 25°.

[0020] Furthermore, the elastic conductive member has a sealing portion on a side facing the first housing and / or a side facing the circuit board;

[0021] When the first shell, the elastic conductive member and the circuit board are fixedly connected in sequence, the sealing portion is compressed and deformed.

[0022] Furthermore, the elastic pressing member is a spring plunger, and the elastic conductive member is a conductive silicone sheet.

[0023] An embodiment of the present invention further provides a foot switch device, comprising at least one of the above-mentioned button structures.

[0024] Compared with the prior art, the embodiments of the present invention mainly have the following beneficial effects:

[0025] The elastic pressing member in the key structure of the present invention will move toward the elastic conductive member after being subjected to external force to squeeze the elastic conductive member in the circuit component. Since the elastic coefficient of the elastic pressing member is greater than the elastic coefficient of the elastic conductive member, the elastic conductive member will undergo elastic deformation before the elastic pressing member when being squeezed. When the elastic conductive member is deformed to the extreme position, the movement of the elastic pressing member toward the elastic conductive member will be hindered when the force is too large, and the elastic pressing member will rebound or form a rebound trend to absorb excess external force, thereby avoiding excessive pressure from being applied to the circuit component instantaneously or continuously through the elastic conductive member, thereby reducing the risk of damage to the circuit component and effectively protecting the circuit component. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the solutions in the present invention or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 is an exploded schematic diagram of a key structure according to an embodiment of the present invention;

[0028] Figure 2 is an exploded schematic diagram of a key structure according to another embodiment of the present invention;

[0029] Figure 3 yes Figure 1 Schematic diagram of the cross section of the elastic conductive member;

[0030] Figure 4 The embodiment of the present invention adopts Figure 1 A top view of the foot switch device of the key structure shown;

[0031] Figure 5 yes Figure 4 A cross-sectional view along AA in FIG.

[0032] Figure 6 yes Figure 5 The enlarged schematic diagram of point B in FIG.

[0033] Figure 7 It is a schematic diagram of the three-dimensional structure of the foot switch device according to an embodiment of the present invention.

[0034] Reference numerals:

[0035] 100-button structure; 111-first shell; 111a-first through hole; 111b-limiting part; 112-second shell; 112a-second through hole; 121-elastic pressing member; 121a-top ring; 121b-rebound part; 122-button; 122a-center guide column; 123-reset member; 131-elastic conductive member; 131a-recessed part; 131b sealing part; 132-circuit board; 200-pedal. DETAILED DESCRIPTION

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs; the terms used in the specification of the invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of the present invention or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0037] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0038] Please refer to Figure 1 An embodiment of the present invention provides a key structure 100, including a first shell 111, a button assembly and a circuit assembly; the first shell 111 is provided with a first through hole 111a; the button assembly includes an elastic pressing member 121, and the circuit assembly includes an elastic conductive member 131, the elastic pressing member 121 and the elastic conductive member 131 are respectively arranged on both sides of the first shell 111, and are both arranged opposite to the first through hole 111a; the elastic coefficient of the elastic pressing member 121 is greater than the elastic coefficient of the elastic conductive member 131, and the elastic pressing member 121 will squeeze the elastic conductive member 131 through the first through hole 111a when subjected to force, and when the external force is continuously applied, the elastic pressing member 121 will rebound or form a rebound trend when the elastic conductive member 131 is deformed to the extreme position.

[0039] In this embodiment, the button structure 100 is applied to a foot switch device. Generally speaking, the force applied to the elastic pressing member 121 is divided into an instantaneous force and a continuous force. The instantaneous force occurs when the elastic pressing member 121 is subjected to a foot impact force. The instantaneous force causes the elastic pressing member 121 to instantly squeeze the elastic conductive member 131 to reach the limit position. In the process before reaching the limit position, since the elastic coefficient of the elastic pressing member 121 is greater than the elastic coefficient of the elastic conductive member 131, the elastic pressing member 121 will not deform, which is equivalent to a rigid push rod. When the elastic conductive member 131 reaches the limit position, at this time, when the instantaneous force on the elastic pressing member 121 reaches a specific value, the elastic conductive member 131 is pressed against the elastic pressing member 121. The pressing piece 121 will rebound, or have a tendency to rebound, to absorb the impact of the instantaneous force. When the rebound maintains balance, the instantaneous force is converted into a continuous force, which is continuously transmitted to the elastic conductive piece 131 through the elastic pressing piece 121, and then continuously acts on the circuit component. Since the elastic pressing piece 121 is continuously in a rebound state, more recovery space is provided for the elastic conductive piece 131, thereby preventing excessive load from squeezing the circuit component and causing damage to the components. Therefore, whether it is an instantaneous force or a continuous force, the elastic pressing piece 121 can absorb excess external force, thereby preventing excessive pressure from being applied to the circuit component instantaneously or continuously through the elastic conductive piece 131, thereby reducing the risk of damage to the circuit component and effectively protecting the circuit component.

[0040] In one embodiment, Figure 2 and Figure 3 As shown, the key structure 100 also includes a second shell 112 connected to the first shell 111, the button assembly also includes a button 122 and a reset member 123, and the circuit assembly also includes a circuit board 132; the second shell 112 is provided with a second through hole 112a, one end of the button 122 is connected to the elastic pressing member 121, and the other end passes through the second through hole 112a and extends out of the second shell 112, and the two ends of the reset member 123 respectively abut against the button 122 and the first shell 111; the first shell 111, the elastic conductive member 131 and the circuit board 132 are connected in sequence, and the elastic conductive member 131 has a recessed portion 131a on a side facing the circuit board 132, and the recessed portion 131a forms a deformation space for the elastic conductive member 131, and when the elastic pressing member 121 applies pressure to the elastic conductive member 131 through the first through hole 111a, the space of the recessed portion 131a will be squeezed until the elastic conductive member 131 contacts the circuit board 132 to form a passage.

[0041] In this embodiment, when the reset member 123 is provided, when the elastic pressing member 121 is subjected to an instantaneous force reaching a specific value and rebounds, the elastic pressing member 121 will detach from the elastic pressing member 121 in a short time, so that a gap is briefly formed between the elastic pressing member 121 and the elastic conductive member 131, and the elastic conductive member 131 then rebounds. When the elastic pressing member 121 overcomes the reset force of the reset member 123, the elastic pressing member 121 after rebounding is pressed on the elastic conductive member 131 as a whole again, avoiding excessive deformation of the elastic conductive member 131, thereby playing a buffering role when the pedal generates excessive instantaneous force to impact the circuit board 132, avoiding damage to components on the circuit board 132, and protecting the circuit board 132 while achieving precise pressing.

[0042] In one embodiment, referring back to Figure 1 The first shell 111 has a limiting portion 111b arranged around or partially around the first through hole 111a, and the other end of the reset member 123 is sleeved on the limiting portion 111b; the limiting portion 111b can realize radial limitation of the reset member 123, and at the same time, the reset member 123 can be axially guided to a certain extent, which is conducive to the elastic pressing member 121 to transmit pressure more evenly.

[0043] In one embodiment, referring back to Figure 3 In the longitudinal section of the recessed portion 131a, the angle α between the wall surface of the recessed portion 131a and the extension line of the end surface is in the range of 15° to 25°. By setting the angle α to an angle within this range, the extrusion deformation process of the elastic conductive member 131 and the reset process after the pressure is released can be smoother.

[0044] In one embodiment, referring back to Figure 3 The elastic conductive member 131 has a sealing portion 131b on one side facing the first housing 111 and / or on one side facing the circuit board 132; when the first housing 111, the elastic conductive member 131 and the circuit board 132 are fixedly connected in sequence, the sealing portion 131b is deformed under pressure. The sealing portion 131b is specifically a sealing ring protruding outward from the surface of the elastic conductive member 131, and the diameter of the sealing ring is larger than the diameter of the first through hole 111a. The sealing is performed by using the sealing portion 131b of the elastic conductive member 131 itself, which has a simple structure and is easy to assemble, and can effectively improve the waterproof performance of the key structure 100.

[0045] In one embodiment, Figures 4 to 6As shown, the elastic conductive member 131 and the elastic pressing member 121 are pre-tightened, and the elastic conductive member 131 is deformed in the pre-tightened state, and the deformation amount is smaller than the deformation amount at the limit position. Since the elastic conductive member 131 and the elastic pressing member 121 are pre-tightened, the key function can be accurately triggered regardless of the size or direction of the external force.

[0046] In this embodiment, when the elastic pressing member 121 is in the initial assembly state, that is, when the button 122 is not stepped on, the elastic conductive member 131 has already come into contact with the surface of the elastic pressing member 121 and is compressed to have a certain deformation amount. The elastic conductive member 131 continues to maintain a compressed state, which can avoid a gap between the elastic pressing member 121 and the elastic conductive member 131 due to manufacturing errors or assembly errors of the device, which is beneficial to ensuring the rebound effect of the elastic conductive member 131. When the elastic pressing member 121 rebounds, the elastic conductive member 131 can follow the initial deformation amount and follow the rebound for a certain stroke to always maintain contact with the elastic pressing member 121. While ensuring the assembly accuracy, the switch function can be realized the moment the button 122 is pressed. While the switching accuracy is high, the circuit board 132 can be protected by the buffering rebound of the elastic pressing member 121.

[0047] In one embodiment, referring back to Figure 2 and Figure 6 A center guide column 122a is provided on the side of the button 122 facing the first shell 111, and the center guide column 122a is used to install the elastic pressing member 121. In this embodiment, the center guide column 122a is coaxially arranged with the first through hole 111a, and accordingly, the elastic pressing member 121 will be coaxial with the first through hole 111a. Similarly, the elastic conductive member 131 is also coaxially arranged with the first through hole 111a, so that the elastic pressing member 121 can evenly apply force to the elastic conductive member 131 to avoid damage to the circuit components.

[0048] In one embodiment, referring back to Figure 2 and Figure 6 The elastic pressing member 121 has a top ring 121a, one end of the elastic pressing member 121 is inserted into the central guide column 122a, and the top ring 121a abuts against the end surface of the central guide column 122a; one end of the reset member 123 is sleeved on the central guide column 122a; through the abutment between the top ring 121a and the central guide column 122a, the external force exerted on the button 122 can be effectively transmitted to the elastic pressing member 121.

[0049] In other embodiments, the elastic pressing member 121 can be coaxially connected to the central guide column 122a in other ways, such as the central guide column 122a is inserted into the elastic pressing member 121, or fixedly connected by glue, or connected by snaps, screws, etc.

[0050] In one embodiment, referring back to Figure 2 and Figure 6 The elastic pressing member 121 includes a rebound portion 121b, and the rebound portion 121b is arranged inside the elastic pressing member 121 through a spring. When the pressure reaches a certain value, the rebound portion 121b will retract into the elastic pressing member 121, converting the external pressure into the elastic force of the spring to achieve buffering, thereby preventing instantaneous impact force from causing damage to components in the circuit board 132.

[0051] In a specific embodiment, the elastic pressing member 121 is cylindrical, and may be a spring plunger.

[0052] In a specific embodiment, the elastic conductive member 131 is a conductive silicone sheet.

[0053] In a specific embodiment, the reset member 123 is a spring.

[0054] The present invention also provides a foot switch device, such as Figure 7 As shown, it includes a key structure 100 and a pedal 200, and the number of the key structure 100 is at least one, such as Figure 7 There are three button structures 100 arranged side by side, and these three button structures 100 can control different working programs respectively. In a specific embodiment, multiple button structures 100 can share the same circuit board 132. When the foot switch device in this embodiment works, the pedal 200 is first stepped on, and then the program control of the target end is realized by operating the buttons of the button structure 100. Since the button structure 100 can absorb the instantaneous impact force, the damage of the components of the circuit board 132 can be effectively avoided.

[0055] The embodiments of the present invention are described in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present invention.

[0056] Obviously, the embodiments described above are only some embodiments of the present invention, rather than all embodiments. The preferred embodiments of the present invention are given in the accompanying drawings, but they do not limit the patent scope of the present invention. The present invention can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive. Although the present invention has been described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific embodiments, or to perform equivalent replacements for some of the technical features therein. Any equivalent structure made using the contents of the specification and drawings of the present invention, directly or indirectly used in other related technical fields, is also within the scope of patent protection of the present invention.

[0057] Although embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, combinations, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A key structure, characterized in that: It includes a first housing, a button assembly and a circuit assembly; The first shell is provided with a first through hole; The button assembly includes an elastic pressing member, and the circuit assembly includes an elastic conductive member, wherein the elastic pressing member and the elastic conductive member are respectively arranged on two sides of the first housing and are both arranged facing the first through hole; The elastic coefficient of the elastic pressing member is greater than the elastic coefficient of the elastic conductive member. The elastic pressing member squeezes the elastic conductive member when subjected to force, and rebounds or forms a rebound tendency when the elastic conductive member is deformed to an extreme position.

2. The key structure according to claim 1, characterized in that: The elastic conductive member and the elastic pressing member are pre-pressed, and the elastic conductive member is deformed in the pre-pressed state, and the deformation amount is smaller than the deformation amount at the limit position.

3. The key structure according to claim 1 or 2, characterized in that: The key structure further includes a second shell connected to the first shell, and the second shell is provided with a second through hole; The button assembly also includes a button and a reset member; One end of the button is connected to the elastic pressing member, and the other end passes through the second through hole and extends out of the second shell. Two ends of the reset member abut against the button and the first shell respectively.

4. The key structure according to claim 3, characterized in that: A central guide column is provided on one side of the button facing the first housing; The elastic pressing piece is provided with a top ring, one end of the elastic pressing piece is inserted into the central guide column, and the top ring abuts against the end surface of the central guide column; One end of the reset member is sleeved on the central guide column.

5. The key structure according to claim 4, characterized in that: The first shell has a limiting portion arranged around or partially around the first through hole, and the other end of the reset member is sleeved on the limiting portion.

6. The key structure according to claim 1 or 2, characterized in that: The circuit assembly further includes a circuit board, and the first housing, the elastic conductive member and the circuit board are connected in sequence; The elastic conductive member has a concave portion on one side facing the circuit board, and the concave portion forms a deformation space for the elastic conductive member.

7. The key structure according to claim 6, characterized in that: In the longitudinal section of the recessed portion, an angle between the wall surface of the recessed portion and an extension line of the end surface is 15° to 25°.

8. The key structure according to claim 7, characterized in that: The elastic conductive member has a sealing portion on one side facing the first housing and / or on one side facing the circuit board; When the first shell, the elastic conductive member and the circuit board are fixedly connected in sequence, the sealing portion is compressed and deformed.

9. The key structure according to claim 1 or 2, characterized in that: The elastic pressing piece is a spring plunger, and the elastic conductive piece is a conductive silicone sheet.

10. A foot switch device, characterized in that: The invention comprises at least one key structure according to any one of claims 1 to 9.

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