Rotary locking mechanism and its application to dental chairs

Abstract

The utility model relates to a rotary locking mechanism technical field, specifically is a rotary locking mechanism and dental chair of application thereof, rotary locking mechanism includes bottom plate, gear pivot, swing arm, spacing piece, extruding piece, first spring, second spring, moving part and drive mechanism, gear pivot, swing arm all with bottom plate rotatable connection, the inside of swing arm is equipped with tooth and is towards gear pivot, the outside is opposite with spacing piece and is equipped with extruding groove, first spring connects swing arm and can drive swing arm to rotate towards spacing piece, extruding piece connects moving part through second spring, drive mechanism can drive moving part reciprocating movement, and then drive extruding piece inserts or leaves extruding groove, the side surface of extruding piece, extruding groove is equipped with inclined plane to make extruding piece insert extruding groove when can drive swing arm to rotate to with gear pivot meshing, the application can switch rotation and locking state fast, and can lock in 360 degree range arbitrary position, has good security, practicality and high efficiency.

Description

Technical Field

[0001] This utility model relates to the field of rotary locking mechanism technology, specifically a rotary locking mechanism and its application in dental chairs. Background Technology

[0002] Most multi-functional chairs and beds (such as dental chairs and office chairs) currently require a rotating function. Once rotated, a locking mechanism is needed to prevent further rotation, facilitating operation by doctors and users. Existing rotating locking mechanisms have the following main problems:

[0003] 1. Cumbersome locking / unlocking operations and poor user experience: Common mechanical locking mechanisms (such as pin-type and slot-type) require users to perform multiple steps such as "aligning the position," "inserting the pin," or "moving the pawl" to complete the locking process. Unlocking also requires the reverse operation. This process is time-consuming and laborious, and cannot achieve quick one-click switching. Especially in situations where frequent adjustments are required, it greatly affects work efficiency and user experience.

[0004] 2. Fixed locking position, lack of flexibility: Due to the reliance on preset pin holes or slots, this type of device can only lock at a limited number of fixed angles (such as every 90 degrees or 45 degrees), which severely limits the scope of use of the device and cannot meet the need for precise positioning at any angle within a 360-degree range.

[0005] 3. The electric rotation solution has inherent defects: Although the fully electric rotation mechanism can achieve positioning at any angle and remote control operation, it has problems such as high cost, complex structure and difficult maintenance. More importantly, electric rotation is not flexible, the forward and reverse switching is slow, the rotation speed is slow, and an additional button or operation is required to stop in the middle. Utility Model Content

[0006] This utility model aims to solve the above problems by providing a rotary locking mechanism and its application in a dental chair. It can quickly switch between rotation and locking states and can lock at any position within a 360-degree range. This overcomes the shortcomings of existing mechanical locking mechanisms, such as cumbersome operation and fixed position, as well as the high cost and poor safety of electric rotary mechanisms, and further improves safety, practicality and efficiency.

[0007] One of the objectives of this utility model is achieved through the following technical solution:

[0008] A rotary locking mechanism includes a base plate, a gear shaft, a swing arm, a limiting member, a pressing member, a first spring, a second spring, a moving member, and a drive mechanism. The gear shaft is rotatably connected to the base plate. The swing arm is hinged to the base plate and located on one side of the gear shaft. The inner side of the swing arm has teeth facing the gear shaft, and the outer side is opposite to the limiting member, with at least one of them having a pressing groove. The first spring connects to the swing arm and can drive the swing arm to rotate toward the limiting member in its natural state. The pressing member is directly opposite the entrance of the pressing groove and is connected to the moving member through the second spring. The drive mechanism is connected to the moving member and can drive it to reciprocate. The second spring then drives the pressing member to insert into or retract from the pressing groove. The sides of the pressing member and / or the pressing groove have inclined surfaces so that when the pressing member is inserted into the pressing groove, it can press the swing arm to overcome the elastic force of the first spring and rotate toward the gear shaft until the teeth of the swing arm mesh with the gear shaft, thereby locking the gear shaft.

[0009] As a preferred technical solution, the driving mechanism includes a bracket fixedly connected to the base plate, a motor mounted on the bracket, and a lead screw driven by the motor. The moving part is a lead screw nut sleeve that is threadedly connected to the lead screw, so that it can reciprocate along the lead screw by the motor drive.

[0010] As a preferred technical solution, the extrusion component is a conical sleeve with a smaller diameter at one end facing the extrusion groove, and the second spring is a compression spring sleeved on the outside of the lead screw, with the end of the lead screw passing through the central hole of the conical sleeve and slidingly engaging with it.

[0011] As a preferred technical solution, the bracket is further provided with a guide block for guiding the reciprocating movement of the moving part.

[0012] As a preferred technical solution, the guide block also has two tactile switches, namely a progress tactile switch and a return tactile switch, which are located on opposite sides of the moving member. The opposite ends of the opposite sides of the moving member are also provided with limiting slopes for triggering the two tactile switches. When the driving mechanism drives the moving member to the front stop or the rear stop, the limiting slopes on the corresponding sides can squeeze the elastic contact of the corresponding tactile switch, thereby controlling the driving mechanism to stop.

[0013] As a preferred technical solution, the outer side of the swing arm and the opposite side of the limiting member are provided with the extrusion groove, and the sides of the two extrusion grooves are provided with inclined surfaces to form a conical groove with an inlet diameter larger than the interior diameter.

[0014] As a preferred technical solution, the first spring is a torsion spring disposed at the hinge pin of the swing arm.

[0015] As a preferred technical solution, the limiting member is fixedly connected to the base plate.

[0016] The second objective of this utility model is achieved through the following technical solution:

[0017] A dental chair includes a dental chair seat and a base, the dental chair seat and the base being rotatably connected, and the rotatable connection between the dental chair seat and the base is further provided with the aforementioned rotary locking mechanism.

[0018] Compared with the prior art, the rotary locking mechanism provided by this utility model has the following advantages:

[0019] (1) During operation, the moving part is driven to move back and forth by the drive mechanism, which drives the extruder to insert into or retract from the extrusion groove. When the extruder is inserted into the extrusion groove, it can extrude the swing arm to overcome the elastic force of the first spring and rotate towards the gear shaft until the teeth of the swing arm mesh with the gear shaft to lock the gear shaft. When the extruder retracts from the extrusion groove, the swing arm can disengage from the gear shaft under the elastic force of the first spring to release the lock on the gear shaft. Thus, the rotation and locking states can be switched quickly, and the lock can be locked at any position within a 360-degree range. This overcomes the shortcomings of the existing mechanical locking mechanism, such as cumbersome operation, fixed position, high cost and poor safety of the electric rotating mechanism, and further improves safety, practicality and efficiency.

[0020] (2) By providing an inclined surface on the side of the extruder and / or the extrusion groove, the extruder can be inserted into the extrusion groove to extrude the swing arm to rotate. This makes the direction of the force of the drive mechanism different from the direction of the reaction force of the gear shaft on the swing arm. Moreover, the lead screw and the tapered sleeve adopt a clearance sliding fit. Therefore, the reaction force of the gear on the swing arm will not act on the drive mechanism, but will act on the limiting part through the extruder. This can greatly increase the service life of the drive mechanism. In addition, the driving force of the drive rod mechanism is not used to directly drive the swing arm and the gear shaft to mesh. Therefore, the drive mechanism does not need to provide a large driving force, and the requirements of the drive mechanism are low, which can effectively reduce the cost. Moreover, this application locks the gear shaft by gear meshing and uses the limiting part to abut the swing arm to prevent it from loosening. Compared with the limited locking force of friction and magnetic attraction schemes, this scheme can withstand a large torque and there is no slippage or inability to lock.

[0021] (3) By setting a second spring, the moving part drives the extruder to insert into the extrusion groove through the second spring. When the driving mechanism drives the moving part to the front stop, the second spring can maintain a certain amount of compression. In this way, when there is a gap between the swing arm and the gear shaft, or between the swing arm and the extruder due to processing or wear, the elastic force of the second spring can be used to press down the extruder to eliminate the gap, effectively reducing the amount of shaking of the rotating mechanism and increasing stability.

[0022] The following description, in conjunction with the accompanying drawings, will further explain the concept, specific structure, and effects of this utility model, so as to fully understand the purpose, features, and effects of this utility model. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the rotary locking mechanism in Embodiment 1;

[0024] Figure 2 yes Figure 1 A schematic diagram of the decomposed structure;

[0025] Figure 3 It is a schematic diagram of the mating structure of the gear shaft, rocker arm, extrusion component and limiting component;

[0026] Figure 4 This is a schematic diagram of the rotary locking mechanism in Embodiment 1 from a side view.

[0027] Figure 5 This is a schematic diagram of the dental chair in Example 2.

[0028] Among them, 1-gear shaft; 2-first spring; 3-shaft sleeve; 4-limiting component; 5-swing arm; 51-extrusion groove; 6-hinge shaft; 7-extrusion component; 8-second spring; 9-moving component; 91-progress limiting inclined plane; 92-return limiting inclined plane; 10-tact switch; 101-progress tactile switch; 102-return tactile switch; 11-lead screw; 12-bracket; 13-guide block; 14-motor; 15-base plate; 16-tooth chair seat; 17-rotation locking mechanism. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for explaining the present utility model and are not intended to limit the present utility model. Furthermore, it should be understood that the terms "first," "second," and similar terms used in this application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components; the terms "a" or "one," etc., do not indicate a quantity limitation, but rather indicate the presence of at least one; the terms "several," "multiple," etc., indicate two or more. Unless otherwise indicated, the terms "front," "rear," "lower," "upper," etc., are merely for ease of explanation and are not limited to a single location or spatial orientation. The terms "installation," "connection," "pivot," etc., should be interpreted broadly, referring to direct connection or indirect connection through intermediate elements. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0030] Example:

[0031] like Figure 1-4As shown, this embodiment provides a rotary locking mechanism, including a base plate 15, a gear shaft 1, a swing arm 5, a limiting member 4, a pressing member 7, a first spring 2, a second spring 8, a moving member 9, and a driving mechanism. The gear shaft 1 is rotatably connected to the base plate 15. The swing arm 5 is hinged to the base plate 15 via a hinge pin 6 and is located on one side of the gear shaft 1. The inner side of the swing arm 5 has teeth facing the gear shaft 1, and the outer side is opposite to the limiting member 4, with at least one of them having a pressing groove 51. The first spring 2 connects to the swing arm 5 and can drive the swing arm 5 to rotate toward the limiting member 4 in its natural state. The pressing member 7 is positioned opposite the entrance of the pressing groove 51 and connected to the moving member 9 via the second spring 8. The driving mechanism drives the moving member 9 to reciprocate, thereby causing the pressing member 7 to insert into or retract from the pressing groove 51 via the second spring 8. The pressing member 7 and / or the pressing groove 51 have inclined surfaces (which can be straight or concave) on their sides, so that when the pressing member 7 is inserted into the pressing groove 51, it can press the swing arm 5 to overcome the elastic force of the first spring 2 and rotate it toward the gear shaft 1 until the teeth of the swing arm 5 mesh with the gear shaft 1, thereby locking the gear shaft 1. In this design, the first spring 2 is preferably a torsion spring, the hinge shaft 6 is sleeved with a bushing 3, the torsion spring is sleeved outside the bushing 3, and the limiting member 4 is a block structure fixedly connected to the base plate 15.

[0032] The working principle and process of the rotary locking mechanism provided in this embodiment are as follows: When it is necessary to lock the rotary mechanism, the driving mechanism drives the moving part 9 to move forward, causing the pressing part 7 to insert into the pressing groove 51. By utilizing the inclined surface of the pressing part 7 and the pressing groove 51, the rocker arm 5 can be pressed to overcome the elastic force of the first spring 2 and rotate towards the gear shaft 1 until the teeth of the rocker arm 5 mesh with the gear shaft 1, thereby quickly locking the gear shaft 1. Moreover, since the circumferential direction of the gear shaft 1 is a gear structure, it can be locked at any position within a 360-degree range. At this time, the gear shaft 1 is in a locked state and cannot rotate. When it is necessary to unlock, the driving mechanism drives the moving part 9 to move backward, causing the pressing part 7 to retract from the pressing groove 51 (retraction here does not necessarily mean that the pressing part is completely removed from the pressing groove, but can also be partially removed). The rocker arm 5 can then disengage from the gear shaft 1 under the elastic force of the first spring 2 to release the lock on the gear shaft 1. At this time, the gear shaft 1 is in a freely rotatable state.

[0033] In summary, the rotary locking mechanism provided in this application has the following advantages compared with the rotary locking mechanisms in the prior art:

[0034] (1) It can quickly switch between rotation and locking states and lock at any position within a 360-degree range, thus overcoming the shortcomings of existing mechanical locking mechanisms, such as cumbersome operation, fixed position, high cost and poor safety of electric rotating mechanisms, and further improving safety, practicality and efficiency.

[0035] (2) By providing an inclined surface on the side of the extrusion member 7 and / or the extrusion groove 51, the extrusion member 7 can be inserted into the extrusion groove 51 to extrude the swing arm 5 to rotate, so that the direction of the force of the driving mechanism is different from the direction of the reaction force of the gear shaft 1 on the swing arm 5. Therefore, the reaction force of the gear on the swing arm 5 will not act on the driving mechanism, but will act on the limiting member 4 through the extrusion member 7. This can greatly increase the service life of the driving mechanism. Moreover, the driving force of the driving rod mechanism is not used to directly drive the swing arm 5 to mesh with the gear shaft 1. Therefore, the driving mechanism does not need to provide a large driving force, and the requirements of the driving mechanism are low, which can effectively reduce the cost. In addition, this application locks the gear shaft by gear meshing and uses the limiting member to abut the swing arm to prevent it from loosening. Compared with the limited locking force of friction and magnetic attraction schemes, this scheme can withstand a large torque and there is no slippage or inability to lock.

[0036] (3) By setting the second spring 8, the moving part 9 drives the extruder 7 to insert into the extrusion groove 51 through the second spring 8. When the driving mechanism drives the moving part 9 to the front stop, the second spring 8 can maintain a certain amount of compression. In this way, when there is a gap between the swing arm 5 and the gear shaft 1, or between the swing arm 5 and the extruder 7 due to processing or wear, the elastic force of the second spring 8 can be used to press down the extruder 7 to eliminate the gap, effectively reduce the shaking of the rotating mechanism and increase stability.

[0037] In a preferred embodiment, the drive mechanism includes a bracket 12 fixedly connected to the base plate 15, a motor 14 mounted on the bracket 12, and a lead screw 11 driven by the motor 14. The moving part 9 is a lead screw nut sleeve threadedly connected to the lead screw 11, thereby enabling it to reciprocate along the lead screw 11 driven by the motor 14. In this embodiment, the drive mechanism uses a motor 14 and a lead screw 11 to drive the moving part 9 to reciprocate along the lead screw 11, resulting in a simple structure, convenient operation, and stable operation. In other embodiments, the drive mechanism can also employ existing pneumatic, hydraulic, or electromagnet-driven mechanisms.

[0038] In a preferred embodiment, the extrusion member 7 is a tapered sleeve with a smaller diameter at the end facing the extrusion groove 51. The second spring 8 is a compression spring sleeved on the outside of the lead screw 11, with the end of the lead screw 11 passing through the central hole of the tapered sleeve and slidingly engaging with it. In this embodiment, the lead screw 11 and the tapered sleeve are in a sliding engagement with a clearance, so the reaction force of the gear on the rocker arm 5 will not act on the lead screw 11 through the tapered sleeve, but will act on the limiting member 4 through the tapered sleeve. Therefore, it can effectively prevent the lead screw 11 from bearing lateral pressure and affecting its service life.

[0039] As a preferred embodiment, the bracket 12 is further provided with a guide block 13 for guiding the reciprocating movement of the moving member 9. The guide block 13 is also provided with two tactile switches 10, namely a progress tactile switch 101 and a return tactile switch 102, which are located on opposite sides of the moving member 9. At opposite ends of opposite sides of the moving member 9, limiting slopes for triggering the two tactile switches are respectively provided, namely a progress limiting slope 91 and a return limiting slope 92. When the driving mechanism drives the moving member 9 to move to the front stop or the rear stop, the elastic contact of the corresponding tactile switch can be squeezed by the limiting slope on the corresponding side, thereby controlling the driving mechanism to stop. This can achieve progress and return limiting of the moving member 9. Moreover, the two tactile switches are triggered by setting limiting slopes at opposite ends of opposite sides of the limiting member 4, which makes the triggering of the tactile switches more convenient and the space design of the tactile switches and the moving member 9 more compact. Furthermore, the ends of the elastic contacts of the two tactile switches are provided with rollers for rolling on the limiting slope, which makes the relative movement of the moving part 9 and the tactile switches smoother and quieter.

[0040] In a preferred embodiment, the outer side of the swing arm 5 and the opposite side of the limiting member 4 are both provided with extrusion grooves 51, and the sides of both extrusion grooves 51 are provided with inclined surfaces to form a conical groove with an inlet diameter larger than the inner diameter, thereby facilitating the guidance and limiting of the extrusion member 7 during insertion into the extrusion groove 51. In a preferred technical solution, the inclined surface angle of the extrusion member 7 is greater than the inclined surface angle of the extrusion groove 51, so as to more easily drive the swing arm 5 to swing when the extrusion member 7 is inserted into the extrusion groove 51.

[0041] Example 2:

[0042] like Figure 5 As shown, this embodiment provides a dental chair, including a dental chair seat 16 and a base. The dental chair seat 16 and the base are rotatably connected, and the rotatable connection between the dental chair seat 16 and the base is also provided with the rotation locking mechanism 17 described in Embodiment 1.

[0043] The dental chair provided in this embodiment is equipped with a rotation locking mechanism 17 as described in Embodiment 1 at the rotation connection between the dental chair seat 16 and the base. This allows dentists to quickly switch between the rotation and locking states of the chair and lock it at any position within a 360-degree range. This overcomes the shortcomings of existing mechanical locking mechanisms, such as cumbersome operation and fixed position, as well as the high cost and poor safety of electric rotation mechanisms. It further improves safety, practicality, and efficiency, and has a longer service life, lower cost, and is less prone to shaking and has good stability when locked.

[0044] It should be noted that the rotation locking mechanism in Embodiment 1 of this application can be used not only for the rotation and locking of dental chairs, but also in other embodiments for devices that require rotation and positioning, such as beauty beds, office chairs, and industrial turntables.

[0045] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the utility model involved in this application is not limited to the specific combinations of the above-described technical features, but should also cover other implementations formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, implementations formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A rotary locking mechanism, characterized in that, The device includes a base plate, a gear shaft, a swing arm, a limiting member, a pressing member, a first spring, a second spring, a moving member, and a drive mechanism. The gear shaft is rotatably connected to the base plate. The swing arm is hinged to the base plate and located on one side of the gear shaft. The inner side of the swing arm has teeth facing the gear shaft, and the outer side is opposite to the limiting member, with at least one of them having a pressing groove. The first spring connects to the swing arm and can drive the swing arm to rotate toward the limiting member in its natural state. The pressing member is directly opposite the entrance of the pressing groove and is connected to the moving member through the second spring. The drive mechanism is connected to the moving member and can drive it to reciprocate. The second spring then drives the pressing member to insert into or retract from the pressing groove. The sides of the pressing member and / or the pressing groove have inclined surfaces so that when the pressing member is inserted into the pressing groove, it can press the swing arm to overcome the elastic force of the first spring and rotate toward the gear shaft until the teeth of the swing arm mesh with the gear shaft, thereby locking the gear shaft.

2. The rotary locking mechanism according to claim 1, characterized in that, The driving mechanism includes a bracket fixedly connected to the base plate, a motor mounted on the bracket, and a lead screw driven by the motor. The moving part is a lead screw nut sleeve that is threadedly connected to the lead screw, so that it can reciprocate along the lead screw driven by the motor.

3. The rotary locking mechanism according to claim 2, characterized in that, The extrusion component is a conical sleeve with a smaller diameter at one end facing the extrusion groove. The second spring is a compression spring sleeved on the outside of the lead screw, with the end of the lead screw passing through the central hole of the conical sleeve and slidingly engaging with it.

4. The rotary locking mechanism according to claim 2, characterized in that, The bracket is also provided with a guide block for guiding the reciprocating movement of the moving part.

5. The rotary locking mechanism according to claim 4, characterized in that, The guide block also has two tactile switches, namely a progress tactile switch and a return tactile switch, which are located on opposite sides of the moving part. The opposite ends of the opposite sides of the moving part are also provided with limiting slopes for triggering the two tactile switches. When the driving mechanism drives the moving part to the front stop or the rear stop, the limiting slopes on the corresponding sides can squeeze the elastic contact of the corresponding tactile switch, thereby controlling the driving mechanism to stop.

6. The rotary locking mechanism according to claim 1, characterized in that, The outer side of the swing arm and the opposite side of the limiting member are both provided with the extrusion groove, and the sides of the two extrusion grooves are both provided with inclined surfaces to form a conical groove with an inlet diameter larger than the interior diameter.

7. The rotary locking mechanism according to claim 1, characterized in that, The first spring is a torsion spring located at the hinge of the swing arm.

8. The rotary locking mechanism according to claim 1, characterized in that, The limiting component is fixedly connected to the base plate.

9. A dental chair, comprising a dental chair seat and a base, wherein the dental chair seat and the base are rotatably connected, characterized in that, The rotating connection between the dental chair seat and the base is further provided with a rotating locking mechanism as described in any one of claims 1-8.

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