Balance arm locking system and dental chair

Abstract

The invention relates to the technical field of medical instruments, in particular to a balance arm locking system and a dental chair, the balance arm locking system is characterized in that a seat body is provided with a cavity and is connected with a second connecting rod, a brake part is arranged in the cavity, and when the pressure in the cavity is increased, the brake part can be driven to slide in the direction close to a first connecting rod; the brake component is abutted against the first connecting rod; the first matching piece and the second matching piece are mounted in the cavity; when no pressure exists in the cavity, the braking part is driven to slide in the direction away from the first connecting rod through magnetic attraction of the first matching part and the second matching part. The brake part abuts against the first connecting rod by increasing the pressure in the cavity, relative sliding of the first connecting rod and the second connecting rod is locked, when no pressure exists in the cavity, the brake part is driven to slide in the direction away from the first connecting rod through magnetic adsorption, and therefore power for retracting the base body can be provided for the brake part during unlocking, and the safety of unlocking is improved. And the situation that the brake piece is adhered or kept in an abutting state is avoided, and adjustment is convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a balancing arm locking system and a dental chair. Background Art

[0002] The dental chair's balance arm supports the tool tray. Due to its lever action, the arm must provide a force several times greater than the weight of the tool tray to lift it. During use, the arm must be moved up and down to adjust the tool tray's position, and then locked in place. This requires limiting the rotating components within the arm to lock the arm.

[0003] Existing locking mechanisms often use an air lock, which is fixed to a connecting rod in the balancing arm. Once the air lock is deployed, it uses friction to lock the other connecting rod in the balancing arm, locking the balancing arm. However, due to the limited friction of the friction lock, the load capacity of the tool tray is limited. However, doctors need to place various instruments on the tool tray during treatment, especially heavier implant systems. This often results in excessive weight, which can easily cause the balancing arm to shift over time, making the locking unreliable.

[0004] Currently, materials with a higher friction coefficient are used to increase friction, such as flexible silicone, which has an adsorption effect and a larger friction coefficient. However, this conflicts with the air lock structure when unlocking. Due to the limited internal space of the balance arm and the need to ensure timely locking, the air lock has a very short stroke. When silicone material is used for contact, it is easy to cause a certain adhesion between the air lock and the silicone after the air is cut off, resulting in a certain resistance when adjusting the unlocked balance arm, and even the situation of being unable to unlock. Summary of the Invention

[0005] In view of this, the purpose of this application is to provide a balance arm locking system and a dental chair to solve the problem that the existing balance arm locking system uses materials with a higher friction coefficient to increase the friction force during locking to ensure the locking effect, but is prone to adhesion during unlocking, resulting in a certain resistance when adjusting the balance arm after unlocking, inconvenience in use, and even failure to adjust and unlock.

[0006] A first aspect of the present invention provides a balancing arm locking system, comprising:

[0007] First connecting rod;

[0008] a second connecting rod, sliding relative to the first connecting rod;

[0009] a locking assembly mounted on the second connecting rod, the locking assembly comprising a seat body and a brake member, the seat body being connected to the second connecting rod, and a cavity being formed inside the seat body, the brake member being disposed in the cavity, and capable of driving the brake member to slide toward the first connecting rod when the pressure in the cavity increases, so as to lock the relative sliding of the first and second connecting rods when the brake member abuts the first connecting rod;

[0010] A magnetic attraction component is installed in the cavity; the magnetic attraction component includes a first mating part arranged on the base body and a second mating part arranged on the brake part; when there is no pressure in the cavity, the brake part is driven to slide in a direction away from the first connecting rod through the magnetic attraction of the first mating part and the second mating part.

[0011] Preferably, the locking assembly further comprises:

[0012] The sealing member is formed into an annular structure surrounding the sliding direction of the braking member, and the sealing member is sandwiched between the cavity wall of the cavity and the circumferential side wall of the braking member.

[0013] Preferably, it also includes:

[0014] a first friction member, mounted on a side of the first connecting rod facing the brake member;

[0015] The second friction member is mounted on a side of the brake member facing the first friction member. When the first connecting rod and the second connecting rod are locked, the first friction member abuts against the second friction member.

[0016] Preferably, the first friction member and / or the second friction member is a flexible member.

[0017] Preferably, the first friction member and / or the second friction member is a rigid member;

[0018] A plurality of first locking protrusions are formed on a side of the first friction member facing the second friction member, and adjacent first locking protrusions form a first locking groove;

[0019] A plurality of second locking protrusions are formed on a side of the second friction member facing the first friction member, and adjacent second locking protrusions form a second locking groove;

[0020] When the first friction member and the second friction member are in contact with each other, the first latching protrusion extends into the second latching groove and the second latching protrusion extends into the first latching groove.

[0021] Preferably, at least one of the first matching member and the second matching member is a permanent magnet. When one of the first matching member and the second matching member is a permanent magnet, the other of the first matching member and the second matching member is a ferromagnetic member capable of being attracted by the permanent magnet.

[0022] Alternatively, the first fitting member is an electromagnet, and a first switch for controlling the magnetic force of the first fitting member is communicatively connected to a second switch for controlling the pressure in the cavity.

[0023] Preferably, the first friction member is a metal member, and a strip groove is formed on a side of the first friction member facing the second friction member. The strip groove extends along the relative sliding direction of the first connecting rod and the second connecting rod, and the strip groove divides the first friction member into a first friction portion and a second friction portion. The first friction portion is provided with a first boss, and a coil is wound around a circumferential side wall of the first boss to form an electromagnetic module.

[0024] A blocking groove is provided on the end surface of the brake member facing the first friction member. The blocking groove and the strip groove are arranged opposite to each other and extend in the same direction. The blocking groove divides the end surface into two protrusions. When locked, the two protrusions are respectively fitted with the first friction member and the second friction member, so that the brake member and the first friction member form a closed ring.

[0025] Preferably, the second friction member is a flexible member, and a recessed mounting groove is provided on the end surface. The second friction member is installed in the mounting groove, and a portion of the second friction member protrudes from the end surface.

[0026] Preferably, a second boss is provided on the second friction portion; when locked, the second boss abuts against one of the two protrusions;

[0027] The first boss and the second boss are made of magnetic conductive material.

[0028] A second aspect of the present invention provides a dental chair comprising the balance arm locking system described in any one of the above technical solutions.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] The balancing arm locking system of the present invention includes a first connecting rod and a second connecting rod that can slide relative to each other; a locking assembly is installed on the second connecting rod, and the locking assembly includes a base body and a brake member. The base body is connected to the second connecting rod and a cavity is formed inside. The brake member is arranged in the cavity. When the pressure in the cavity increases, the brake member can be driven to slide in a direction close to the first connecting rod, so that the brake member extends out of the base body, so as to lock the relative sliding of the first connecting rod and the second connecting rod when the brake member abuts against the first connecting rod, thereby fixing the balancing arm at the position and height required by the doctor; a magnetic attraction assembly is installed in the cavity, and the magnetic attraction assembly includes a first matching member arranged on the base body and a second matching member arranged on the brake member; when there is no pressure in the cavity, the brake member is driven to slide in a direction away from the first connecting rod through magnetic attraction of the first matching member and the second matching member, so that when the balancing arm is unlocked, the brake member can be provided with power to retract the base body to avoid the brake member from sticking or remaining in an abutting state, which is convenient for the doctor to adjust, so that the balancing arm locking system can be locked and unlocked in a timely and effective manner, meeting the doctor's needs for using the dental chair.

[0031] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific 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.

[0033] Figure 1 A schematic structural diagram of a balance arm locking system provided by an embodiment of the present invention;

[0034] Figure 2 An exploded diagram of the structure of a balance arm locking system provided by an embodiment of the present invention;

[0035] Figure 3 A cross-sectional view of the structure of a balance arm locking system provided by an embodiment of the present invention;

[0036] Figure 4 for Figure 3 Schematic diagram of the enlarged structure at A in the middle;

[0037] Figure 5 An exploded view of the structure of the locking assembly in the balance arm locking system provided by an embodiment of the present invention;

[0038] Figure 6A schematic structural diagram of a first friction member having a first locking protrusion and a first locking groove in a balancing arm locking system provided by an embodiment of the present invention;

[0039] Figure 7 An exploded view of the structure of a brake member and a second friction member having a second protrusion and a second groove in a balance arm locking system provided by an embodiment of the present invention;

[0040] Figure 8 An exploded view of the structure of a second friction member and a brake member with a protrusion in a balancing arm locking system provided by an embodiment of the present invention;

[0041] Figure 9 A cross-sectional view of a structure of a brake member having a protrusion and a first friction member having a first boss and a second boss in a balancing arm locking system provided by an embodiment of the present invention when locked;

[0042] Figure 10 A structural cross-sectional view of a brake member having a protrusion and a first friction member having a first boss and a second boss in a balance arm locking system provided by an embodiment of the present invention, when locked, from another perspective.

[0043] Icon: 1-support arm; 2-adjusting arm; 3-supporting arm; 100-first connecting rod; 200-second connecting rod; 11-base; 111-cavity; 12-brake member; 121-blocking groove; 122-mounting groove; 120-protrusion; 13-sealing member; 21-first mating member; 22-second mating member; 31-first friction member; 311-first cam; 312-first slot; 301-strip groove; 310-first friction part; 3101-first boss; 300-coil; 320-second friction part; 3201-second boss; 32-second friction member; 321-second cam; 322-second slot. DETAILED DESCRIPTION

[0044] The following detailed description is provided to help the reader gain a comprehensive understanding of the methods, devices, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, devices, and / or systems described herein will be apparent upon understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein. Rather, except for operations that must occur in a particular order, changes may be made that will be apparent upon understanding the disclosure of this application. Furthermore, descriptions of features known in the art may be omitted for clarity and brevity.

[0045] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many possible ways to implement the methods, devices, and / or systems described herein that will be apparent upon understanding the disclosure of this application.

[0046] Throughout the specification, when an element (such as a layer, region, or substrate) is described as being “on,” “connected to,” “coupled to,” “over,” or “overlaying” another element, it may be directly “on,” “connected to,” “coupled to,” “over,” or “overlaying” another element, or one or more other elements may be present between them. In contrast, when an element is described as being “directly on,” “directly connected to,” “directly coupled to,” “directly over,” or “directly covering” another element, there may be no other elements intervening therebetween.

[0047] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0048] Although terms such as "first," "second," and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions are not limited by these terms. Rather, these terms are used only to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Thus, a first member, component, region, layer, or portion in the examples described herein may also be referred to as a second member, component, region, layer, or portion without departing from the teachings of the examples.

[0049] For ease of description, spatial relational terms such as "above," "upper," "below," and "lower" may be used herein to describe the relationship of one element to another element as shown in the accompanying drawings. Such spatial relational terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, an element described as being "above" or "upper" relative to another element would subsequently be "below" or "lower" relative to the other element. Thus, the term "above" includes both the orientations "above" and "below," depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relational terms used herein will be interpreted accordingly.

[0050] The terms used herein are intended only to describe various examples and are not intended to limit the present disclosure. Unless the context clearly indicates otherwise, the singular is intended to include the plural. The terms "comprise," "include," and "have" list the presence of stated features, quantities, operations, components, elements, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0051] Due to manufacturing techniques and / or tolerances, variations in the shapes shown in the drawings may occur. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include changes in shapes that occur during manufacturing.

[0052] The features of the examples described herein can be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application.

[0053] According to a first aspect of the present invention, a balancing arm locking system is provided, which includes a first connecting rod 100, a second connecting rod 200, a locking assembly, and a magnetic attraction assembly.

[0054] Hereinafter, the specific structures of the above components of the balance arm locking system according to the present embodiment will be described.

[0055] like Figure 1 As shown, along the length direction of the balancing arm, the balancing arm includes a support arm 1, an adjusting arm 2 and a supporting arm 3 connected in sequence, wherein the adjusting arm 2 is arranged in the middle and its two ends in the length direction are rotatably connected to the support arm 1 and the supporting arm 3 respectively, and the tool disk is arranged at the end of the supporting arm 3 away from the adjusting arm 2. In this embodiment, the first connecting rod 100, the second connecting rod 200, the locking assembly and the magnetic attraction assembly are all arranged on the adjusting arm 2.

[0056] In this embodiment, if Figure 1 and Figure 2 As shown, the first link 100 is formed as a bar-shaped rod-like structure and extends along the length direction of the adjusting arm 2, the second link 200 is formed as a partial shell of the adjusting arm 2, the first link 100 is arranged inside the second link 200, the first link 100 and the second link 200 are hinged to the support arm 1 and the supporting arm 3 respectively, so that the first link 100 and the support arm 1 and the supporting arm 3 and the two hinges, and the second link 200 and the support arm 1 and the supporting arm 3 form a parallelogram, and driving the first link 100 and the second link 200 to slide relative to each other can change the area of ​​the parallelogram to adjust the position of the tool disk.

[0057] In this embodiment, if Figure 2 and Figure 3 As shown, two second connecting rods 200 are provided, and the two second connecting rods 200 are spaced apart along the radial direction of the adjustment arm 2 to achieve driving balance.

[0058] In this embodiment, if Figures 1 to 5 As shown, the locking assembly is installed on the second connecting rod 200. Specifically, the locking assembly includes a base body 11 and a brake member 12. The base body 11 is formed into a block structure and is connected to the second connecting rod 200, so that the locking assembly is fixedly installed on the second connecting rod 200 via the base body 11. A cavity 111 is formed inside the base body 11. Preferably, the opening of the cavity 111 is set toward the first connecting rod 100.

[0059] More specifically, in this embodiment, if Figures 3 to 5 As shown, the brake member 12 is formed as a slider structure and is arranged in the cavity 111, so that the brake member 12 is slidably connected to the base body 11, and the brake member 12 closes the opening of the cavity 111 so that the cavity 111 surrounded by the base body 11 and the brake member 12 forms a closed space, and the fluid supply device is connected to the closed cavity 111, and the fluid is input into the cavity 111 to increase the pressure in the cavity 111. When the pressure in the cavity 111 increases, the volume of the cavity 111 increases accordingly to drive the brake member 12 to slide toward the direction close to the first connecting rod 100, so that the brake member 12 extends out of the base body 11, so as to lock the relative sliding of the first connecting rod 100 and the second connecting rod 200 when the brake member 12 abuts against the first connecting rod 100, thereby utilizing friction to lock the balance arm.

[0060] It should be noted that there is no limit on the path of the brake member 12 extending away from the seat body 11, so when the pressure in the cavity 111 increases, the brake member 12 will stop moving only when it encounters an obstacle (such as the first connecting rod 100 or the first friction member 31 described below).

[0061] In this embodiment, the fluid introduced into the cavity 111 is preferably gas, which has the advantages of rapid control, simple maintenance, and low cost; optionally, the fluid introduced into the cavity 111 may be liquid.

[0062] Preferably, if Figure 3 As shown, a plurality of brake members 12 are provided on the base body 11 to improve the reliability of the balance arm when locked; preferably, at least two brake members 12 extend out of the base body 11 in opposite directions, so that the brake members 12 can abut against two opposite side walls on the first connecting rod 100 to further improve the reliability of locking.

[0063] In other optional embodiments, the base 11 of the locking assembly can also be installed on the first link 100, and the brake member 12 can slide toward the direction close to the second link 200 to lock the relative sliding of the first link 100 and the second link 200 when the brake member 12 abuts against the second link 200.

[0064] In this embodiment, if Figures 3 to 5 As shown, the magnetic attraction component is installed in the cavity 111. Specifically, the magnetic attraction component includes a first fitting part 21 arranged on the base body 11 and a second fitting part 22 arranged on the brake part 12. Under the action of magnetic force, the first fitting part 21 and the second fitting part 22 can attract each other, so that the second fitting part 22 can move in the direction close to the first fitting part 21. The first fitting part and the second fitting part 22 can be fixed by fasteners such as screws, which is convenient for assembly and the assembly is firm and reliable. When there is no pressure in the cavity 111, the brake part 12 is driven to slide in the direction away from the first connecting rod 100 through the magnetic attraction of the first fitting part 21 and the second fitting part 22. In this way, when the balance arm is unlocked, the brake part 12 can be provided with power to retract the base body 11, avoiding the brake part 12 from sticking or maintaining an abutment state, which is convenient for the doctor to adjust, so that the balance arm locking system can be locked and unlocked in a timely and effective manner to meet the doctor's needs.

[0065] In an optional embodiment, at least one of the first fitting part 21 and the second fitting part 22 is a permanent magnet, which can be a magnet. Specifically, when one of the first fitting part 21 and the second fitting part 22 is a permanent magnet, the other of the first fitting part 21 and the second fitting part 22 is a ferromagnetic part that can be adsorbed by the permanent magnet, which can be a block structure made of iron, cobalt or nickel that can be adsorbed by the magnet; when the first fitting part 21 and the second fitting part 22 are both permanent magnets, the polarities of the opposite sides of the first fitting part 21 and the second fitting part 22 are opposite to each other to ensure that the first fitting part 21 and the second fitting part 22 can attract each other.

[0066] In other optional embodiments, the first matching member 21 is an electromagnet, and the second matching member 22 can be a permanent magnet or a ferromagnetic member. When the second matching member 22 is a permanent magnet, the polarities of the opposite sides of the electromagnet and the second matching member 22 are opposite. Preferably, the first switch for controlling the magnetic force of the first fitting 21 is communicatively connected to the second switch for controlling the pressure in the cavity 111, so that when the first fitting 21 is an electromagnet and the second fitting 22 is a ferromagnetic part, the first switch is closed when the second switch is turned on, so that when pressurization is applied to the cavity 111, the magnetic adsorption of the first fitting 21 and the second fitting 22 is reduced, so that the external force of the brake part 12 is relatively increased; when the first fitting 21 is an electromagnet and the second fitting 22 is a permanent magnet, when it is necessary to apply pressure to the cavity 111, the second switch is turned on and the polarity of the electromagnet is adjusted through the first switch, so that the polarity of the opposite sides of the first fitting 21 and the second fitting 22 is the same, thereby increasing the external force of the brake part 12 under the dual action of magnetic force and pressure, thereby improving the locking effect of the brake part 12.

[0067] In a preferred embodiment, a protective member is provided between the first and second mating members 21, 22. The protective member can be a soft cushion to prevent the first and second mating members 21, 22 from colliding and making noise when they attract each other. In other optional embodiments, a limiting structure is provided between the first and second mating members 21, 22. This limiting structure can be a bump provided on the brake member 12 or on the wall of the cavity 111. This prevents the first and second mating members 21, 22 from contacting each other when they attract each other. This allows the first and second mating members 21, 22 to be spaced apart when the brake member 12 is retracted into the seat 11, thereby preventing the first and second mating members 21, 22 from having difficulty separating when pressure is applied to the cavity 111, thereby improving the locking reaction speed of the brake member 12.

[0068] In this embodiment, the magnetic components and the brake members 12 are arranged in a one-to-one correspondence, so that each brake member 12 can be retracted into the seat body 11 in time when unlocking. Figure 4 As shown, the first fitting part 21 is installed on the cavity wall of the cavity 111 away from the opening side and the second fitting part 22 is installed on the end of the brake part 12 away from the first connecting rod 100, so that the first fitting part 21 and the second fitting part 22 are arranged relative to each other in the sliding direction of the brake part 12, thereby improving the reliability of the second fitting part 22 moving toward the direction close to the first fitting part 21, so that in the unlocked state, the brake part 12 can retract in time to separate the first connecting rod 100 and the second connecting rod 200.

[0069] In a preferred embodiment, in the unlocked state, the brake member 12 can be fully retracted into the cavity 111, thereby avoiding interference when adjusting the balance arm.

[0070] In this embodiment, if Figure 4 As shown, the locking assembly further includes a seal 13, which is formed as an annular structure surrounding the sliding direction of the brake member 12. That is, the axis of the annular seal 13 is parallel to the sliding direction of the brake member 12. The seal 13 can be a sealing ring. The seal 13 is sandwiched between the cavity wall of the cavity 111 and the circumferential sidewall of the brake member 12 to prevent the fluid in the cavity 111 from leaking out, improve the sealing performance of the cavity 111, and ensure that the brake member 12 can slide smoothly outward. In this embodiment, the circumferential sidewall of the brake member 12 is provided with an annular groove, and a portion of the seal 13 is embedded in the annular groove to achieve axial fixation of the seal 13.

[0071] Furthermore, in a preferred embodiment, Figure 4 As shown, a groove is provided on the side of the seal 13 facing the cavity 111, so that the axial cross-section of the seal 13 is formed into two symmetrically arranged V-shaped structures. In this way, when the pressure in the cavity 111 increases, the fluid can enter the groove of the V-shaped structure, so that the two side walls of the V-shaped structure respectively abut against the cavity wall of the cavity 111 and the side wall of the brake member 12, further improving the sealing effect.

[0072] In this embodiment, if Figures 2 to 10 As shown, the balance arm locking system also includes a first friction member 31 and a second friction member 32, which are used to increase friction during locking and improve locking reliability. Specifically, the first friction member 31 is mounted on the side of the first connecting rod 100 facing the brake member 12; the second friction member 32 is mounted on the side of the brake member 12 facing the first friction member 31. When the first connecting rod 100 and the second connecting rod 200 are locked, the first friction member 31 abuts the second friction member 32. In this embodiment, a recessed mounting groove 122 is formed on the end surface of the brake member 12 facing the first connecting rod 100. The second friction member 32 is disposed in the mounting groove 122, and a portion of the second friction member 32 extends out of the mounting groove 122 to protrude above the end surface of the brake member 12, allowing the first friction member 31 to abut the second friction member 32.

[0073] In a first embodiment, if Figure 3 and Figure 4As shown, the first friction member 31 and / or the second friction member 32 are flexible members, which may be made of polyurethane (PU) to increase the friction coefficient of the first friction member 31 and / or the second friction member 32, so that the first friction member 31 and the second friction member 32 squeeze each other when in contact, thereby achieving a tighter fit. Since the magnetic assembly can drive the brake member 12 toward the direction of retracting the seat 11 when there is no pressure in the cavity 111, this prevents the first friction member 31 and the second friction member 32 from being too close together, thereby increasing the resistance between the first connecting rod 100 and the second connecting rod 200 or preventing separation. In this embodiment, the first friction member 31 and / or the second friction member 32 may also be made of a material with a high friction coefficient, such as silicone or rubber.

[0074] In a second embodiment, if Figure 6 and Figure 7 As shown, the first friction member 31 and / or the second friction member 32 are rigid members, which may be made of metal. A plurality of first latching protrusions 311 are formed on the side of the first friction member 31 facing the second friction member 32, and adjacent first latching protrusions 311 form a first latching groove 312. A plurality of second latching protrusions 321 are formed on the side of the second friction member 32 facing the first friction member 31, and adjacent second latching protrusions 321 form a second latching groove 322. When the first friction member 31 and the second friction member 32 abut against each other, the first latching protrusion 311 extends into the second latching groove 322 and the second latching protrusion 321 extends into the first latching groove 312, so that the first friction member 31 and the second friction member 32 can fit together when abutting against each other, thereby hindering the relative sliding between the first friction member 31 and the second friction member 32, thereby achieving locking.

[0075] Furthermore, in this embodiment, Figure 6 and Figure 7 As shown, the first latching protrusion 311 and the second latching protrusion 321 are both formed into a strip structure, and multiple first latching protrusions 311 and multiple second latching protrusions 321 are respectively arranged at intervals along the width direction of their own strip structures. The length direction of the strip structure is set at an angle to the relative sliding direction of the first connecting rod 100 and the second connecting rod 200, and is preferably set vertically. In this way, the locking force when the first friction member 31 and the second friction member 32 are engaged with each other is increased, relative sliding of the first connecting rod 100 and the second connecting rod 200 is avoided, and the locking reliability is improved.

[0076] In a third embodiment, as Figures 8 to 10As shown, the first friction member 31 is a metal member. A strip groove 301 is provided on the side of the first friction member 31 facing the second friction member 32. The strip groove 301 preferably extends along the relative sliding direction of the first connecting rod 100 and the second connecting rod 200, and the two ends of the strip groove 301 in the length direction respectively pass through the edge of the first friction member 31. The strip groove 301 divides the first friction member 31 into a first friction portion 310 and a second friction portion 320. The first friction portion 310 is provided with a first boss 3101. The first boss 3101 can be formed by the first friction member 31. The surface facing the second friction member 32 is formed by protruding outward, or an annular groove may be formed on the surface of the first friction member 31 facing the second friction member 32, and the protruding part in the middle of the annular groove forms a first boss 3101, and the circumferential side wall of the first boss 3101 is wound with a coil 300, so that when the coil 300 is energized, the first boss 3101 and the coil 300 together form an electromagnetic module, which is equivalent to an electromagnet, and the end of the coil 300 away from the first boss 3101 is embedded in the strip groove 301 to realize the wiring arrangement of the electromagnetic module.

[0077] In this embodiment, if Figure 8 and Figure 9 As shown, the brake member 12 is a metal member, and a blocking groove 121 is provided on the end surface of the brake member 12 facing the first friction member 31. The blocking groove 121 is formed into a strip structure and the two ends of the blocking groove 121 in the length direction respectively pass through the edge of the end surface of the brake member 12 facing the first friction member 31, so that the blocking groove 121 divides the end surface into two protrusions 120. The blocking groove 121 and the strip groove 301 are arranged opposite to each other and extend in the same direction. When locked, the two protrusions 120 are respectively fitted with the first friction portion 310 and the second friction portion 320, so that the brake member 12 and the first friction member 31 form a closed ring, so that the magnetic permeability is greatly increased, and the magnetic field formed by the electromagnetic module can be relatively concentrated in the area surrounded by the ring, so that the fitting force between the first friction member 31 and the brake member 12 is stronger, thereby improving the locking reliability.

[0078] Furthermore, in this embodiment, Figure 8 and Figure 9 As shown, the second friction member 32 is a flexible member, such as PU material, and a recessed mounting groove 122 is provided on the end face of the brake member 12 facing the first friction member 31. The second friction member 32 is installed in the mounting groove 122 and part of the second friction member 32 protrudes from the end face. This prevents the electromagnetic module from having excessive impact force when the first friction member 31 and the brake member 12 are attracted when power is turned on, causing abnormal noise. Therefore, buffering is first achieved by the second friction member 32, and then the first friction member 31 and the brake member 12 are fitted together, which also makes the second friction member 32 subject to greater extrusion pressure, thereby providing greater friction.

[0079] Preferably, if Figure 10 As shown, a plurality of first bosses 3101 are provided, and the coils 300 are provided in a one-to-one correspondence with the first bosses 3101. The plurality of first bosses 3101 are arranged along the extension direction of the strip groove 301. In this way, when the balance arm is unlocked, that is, when the brake member 12 and the first friction member 31 are not in a mating relationship, the brake member 12 can move along the extension direction of the strip groove 301 under the action of the relative movement of the first connecting rod 100 and the second connecting rod 200. Therefore, no matter how the brake member 12 moves, the distance between the brake member 12 and the upper surface of the first friction member 31 remains unchanged, that is, the distance between the two planes does not change. (Even if the brake member 12 moves with the balance arm, since the direction of movement is perpendicular to the direction of movement during magnetic attraction, no matter how the brake member 12 moves with the balance arm, as long as it is affected by the magnetic force, the distance between the two is unchanged); when it is necessary to lock the balance arm, the pressure in the cavity 111 is increased and the coil 300 is energized. Under the action of the pressure in the cavity 111 and the magnetic attraction, the second friction member 32 is squeezed to contact the first friction member 31. At the same time, the brake member 12 and the first friction member 31 are tightly attached to prevent the first connecting rod 100 and the second connecting rod 200 from sliding relative to each other.

[0080] It should be noted that, in this embodiment, when the balance arm is adjusted, the brake member 12 moves infinitely and may be retained at any position, but the protrusion on the brake member 12 is ensured to abut against at least one boss no matter where the brake member 12 is.

[0081] In this embodiment, if Figure 10 As shown, a second boss 3201 is provided on the second friction part 320. The second boss 3201 can be formed by the surface of the first friction member 31 facing the second friction member 32 protruding outward, or an annular groove can be formed on the surface of the first friction member 31 facing the second friction member 32, and the protruding part in the middle of the annular groove forms the second boss 3201. The second boss 3201 can have the same structure as the first boss 3101, or the size of the second boss 3201 is smaller than the first boss 3101 and multiple second bosses 3201 are arranged more densely to increase the contact area; when locked, the second boss 3201 abuts against one of the two protrusions 120 to increase the friction force.

[0082] In this embodiment, the first and second bosses 3101, 3201 are made of a magnetically conductive material. The first and second bosses 3101, 3201 function to better guide the magnetic field and concentrate the magnetic field, forming a closed loop within the magnetically conductive material. It should be noted that the remaining portions of the first friction member 31, excluding the first and second bosses 3101, 3201, may be made of a non-magnetic material, such as plastic.

[0083] According to the present invention, the balancing arm locking system includes a first link and a second link that can slide relative to each other; a locking assembly is installed on the second link, and the locking assembly includes a base body and a brake member. The base body is connected to the second link and a cavity is formed inside. The brake member is arranged in the cavity. When the pressure in the cavity increases, the brake member can be driven to slide in a direction close to the first link, so that the brake member extends out of the base body, so as to lock the relative sliding of the first link and the second link when the brake member abuts against the first link, thereby fixing the balancing arm at the position and height required by the doctor; a magnetic attraction assembly is installed in the cavity, and the magnetic attraction assembly includes a first mating member arranged on the base body and a second mating member arranged on the brake member; when there is no pressure in the cavity, the brake member is driven to slide in a direction away from the first link by magnetic attraction of the first mating member and the second mating member, so that when the balancing arm is unlocked, the brake member can be provided with power to retract the base body to avoid the brake member from sticking or remaining in an abutting state, which is convenient for the doctor to adjust, so that the balancing arm locking system can be locked and unlocked in a timely and effective manner to meet the doctor's usage needs.

[0084] A dental chair provided according to the second aspect of the present invention includes the above-mentioned balancing arm locking system, and thus has all the beneficial effects of the balancing arm locking system, which will not be described in detail here.

[0085] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The scope of protection of the present application is not limited thereto. Although the present application has been described in detail with reference to the above-described embodiments, those skilled in the art should understand that any person skilled in the art can modify or easily conceive of changes to the technical solutions described in the above-described embodiments within the technical scope disclosed in the present application, or perform equivalent replacements for some of the technical features thereof. These modifications, changes, or replacements do not deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application shall be subject to the scope of protection of the claims.

Claims

1. A balancing arm locking system, characterized in that: include: First connecting rod; a second connecting rod, sliding relative to the first connecting rod; a locking assembly mounted on the second connecting rod, the locking assembly comprising a seat body and a brake member, the seat body being connected to the second connecting rod, and a cavity being formed inside the seat body, the brake member being disposed in the cavity, and being able to drive the brake member to slide toward the direction close to the first connecting rod when the pressure in the cavity increases, so as to achieve locking of the relative sliding of the first connecting rod and the second connecting rod when the brake member abuts against the first connecting rod; A magnetic attraction component is installed in the cavity; the magnetic attraction component includes a first matching piece arranged on the seat body and a second matching piece arranged on the brake piece; when there is no pressure in the cavity, the brake piece is driven to slide in a direction away from the first connecting rod through the magnetic attraction of the first matching piece and the second matching piece.

2. The balance arm locking system according to claim 1, characterized in that: The locking assembly also includes: The sealing member is formed into an annular structure surrounding the sliding direction of the braking member, and the sealing member is sandwiched between the cavity wall of the cavity and the circumferential side wall of the braking member.

3. The balance arm locking system according to claim 1, characterized in that: Also includes: A first friction member, mounted on a side of the first connecting rod facing the brake member; The second friction member is installed on a side of the brake member facing the first friction member, and when the first connecting rod and the second connecting rod are locked, the first friction member abuts against the second friction member.

4. The balancing arm locking system according to claim 3, characterized in that: The first friction member and / or the second friction member is a flexible member.

5. The balancing arm locking system according to claim 3, characterized in that: The first friction member and / or the second friction member is a rigid member; A plurality of first locking protrusions arranged at intervals are formed on a side of the first friction member facing the second friction member, and adjacent first locking protrusions form a first locking groove; A plurality of second locking protrusions arranged at intervals are formed on a side of the second friction member facing the first friction member, and adjacent second locking protrusions form a second locking groove; When the first friction member and the second friction member are in contact with each other, the first latching protrusion extends into the second latching groove and the second latching protrusion extends into the first latching groove.

6. The balance arm locking system according to claim 1, characterized in that: At least one of the first matching piece and the second matching piece is a permanent magnet. When one of the first matching piece and the second matching piece is a permanent magnet, the other of the first matching piece and the second matching piece is a ferromagnetic piece that can be attracted by the permanent magnet. Alternatively, the first matching member is an electromagnet, and a first switch for controlling the magnetic force of the first matching member is communicatively connected with a second switch for controlling the pressure in the cavity.

7. The balance arm locking system according to claim 3, characterized in that: The first friction member is a metal member, a strip groove is provided on a side of the first friction member facing the second friction member, the strip groove extends along the relative sliding direction of the first connecting rod and the second connecting rod, the strip groove divides the first friction member into a first friction portion and a second friction portion, the first friction portion is provided with a first boss, and a circumferential side wall of the first boss is wound with a coil to form an electromagnetic module; A blocking groove is provided on the end surface of the brake member facing the first friction member. The blocking groove and the strip groove are arranged opposite to each other and extend in the same direction. The blocking groove divides the end surface into two protrusions. When locked, the two protrusions are respectively arranged to fit the first friction member and the second friction member, so that the brake member and the first friction member form a closed ring.

8. The balancing arm locking system according to claim 7, characterized in that: The second friction member is a flexible member, and a recessed mounting groove is arranged on the end surface. The second friction member is installed in the mounting groove and a portion of the second friction member protrudes from the end surface.

9. The balancing arm locking system according to claim 7, characterized in that: The second friction part is provided with a second boss; when locked, the second boss abuts against one of the two protrusions; The first boss and the second boss are made of magnetic conductive material.

10. A dental chair, characterized in that: A balance arm locking system comprising the balance arm locking system according to any one of claims 1 to 9.

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