Rotary locking mechanism and dental chair applying same

Abstract

The invention relates to the technical field of rotary locking mechanisms, in particular to a rotary locking mechanism and a dental chair with the rotary locking mechanism thereof.The rotary locking mechanism comprises a bottom plate, a gear rotating shaft, a swing arm, a limiting piece, an extrusion piece, a first spring, a second spring, a moving piece and a driving mechanism, and the gear rotating shaft and the swing arm are both rotationally connected with the bottom plate; the inner side of the swing arm is provided with teeth and faces the gear rotating shaft, the outer side of the swing arm is opposite to the limiting piece and is provided with an extrusion groove, the first spring is connected with the swing arm and can drive the swing arm to rotate towards the limiting piece, the extrusion piece is connected with the moving piece through the second spring, and the driving mechanism can drive the moving piece to reciprocate and then drive the extrusion piece to be inserted into or retreat from the extrusion groove. The side face of the extrusion groove is provided with an inclined face so that the extrusion piece can drive the swing arm to rotate to be meshed with the gear rotating shaft when inserted into the extrusion groove. The rotating state and the locking state can be rapidly switched, locking can be conducted at any position within the 360-degree range, and good safety, practicability and high efficiency are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rotary locking mechanisms, in particular to a rotary locking mechanism and a dental chair using the same. BACKGROUND

[0002] Most multifunctional bed chairs (such as dental chairs and office chairs) currently require the bed chair to have a rotating function. After rotation is completed, a locking mechanism is used to keep the bed chair from rotating, which is convenient for doctors and users to operate. The existing rotary locking mechanisms mainly have the following problems:

[0003] 1. Complicated locking / unlocking operation and poor user experience: Common mechanical locking mechanisms (such as pin type and slot type) require the user to perform multiple steps such as "aligning the position", "inserting the pin shaft", or "pulling the pawl" to complete the locking. The reverse operation is also required for unlocking. This process is time-consuming and laborious, and cannot achieve quick one-key switching, especially in situations that require frequent adjustment, which greatly affects work efficiency and user experience.

[0004] 2. Fixed locking position and insufficient flexibility: Due to the dependence on pre-set pin holes or slots, such devices can only be locked at a limited number of fixed angles (such as every 90 degrees or 45 degrees), which severely limits the use of the device and cannot meet the demand for precise positioning at any angle within a 360-degree range.

[0005] 3. Inherent defects of electric rotary scheme: Although the full electric rotary mechanism can achieve arbitrary angle positioning and remote control operation, it has problems such as high cost, complex structure, and difficult maintenance. More importantly, the electric rotary is not flexible, the forward and reverse switching is slow, the rotation speed is slow, and additional keys or operations are required for intermediate stop. SUMMARY

[0006] The present application aims to solve the above problems and provide a rotary locking mechanism and a dental chair using the same, which can quickly switch between rotating and locking states and can lock at any position within a 360-degree range. This overcomes the defects of existing mechanical locking mechanisms, such as complicated operation, fixed position, and electric rotary mechanisms, such as high cost and poor safety. It further improves safety, practicality, and efficiency.

[0007] One of the tasks of the present application is achieved by the following technical solution:

[0008] The utility model provides a kind of rotation locking mechanism, including bottom plate, gear rotation axis, swing arm, limiting piece, extrusion piece, first spring, second spring, moving part and drive mechanism, gear rotation axis is rotatably connected with bottom plate, swing arm is hinged to bottom plate and located gear rotation axis side, the inside of swing arm is equipped with tooth and towards gear rotation axis, outside is oppositely arranged with limiting piece and at least one of two is equipped with extrusion slot, the first spring is connected swing arm and can drive swing arm to rotate towards limiting piece in natural state, the extrusion piece is opposite the entrance of extrusion slot and is connected the moving part by second spring, drive mechanism is transmission connection moving part and can drive its reciprocating movement, in turn, by second spring drive extrusion piece inserts or retreats from extrusion slot, the side of extrusion piece and / or extrusion slot is equipped with inclined plane, to enable extrusion piece to insert extrusion slot can extrude swing arm overcome the elastic force of first spring and rotate towards gear rotation axis to the tooth of swing arm is engaged with gear rotation axis and realizes the locking of gear rotation axis.

[0009] As a preferred technical solution, the drive mechanism includes a bracket fixedly connected to the bottom plate, a motor mounted on the bracket, and a lead screw driven by the motor.

[0010] As a preferred technical solution, the extrusion piece is a taper sleeve, one end of the taper sleeve towards the extrusion slot has a smaller diameter, and the second spring is a compression spring sleeved outside the lead screw, and the end of the lead screw passes through the middle hole of the taper sleeve and is in sliding fit with the taper sleeve.

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

[0012] As a preferred technical solution, the guide block further has two touch switches, which are a forward touch switch and a return touch switch respectively, and are located on opposite sides of the moving part respectively, and the opposite ends of the opposite sides of the moving part are further respectively provided with a limiting inclined surface for triggering the two touch switches, when the drive mechanism drives the moving part to move to the front dead point or the rear dead point, the corresponding touch switch can be pressed by the limiting inclined surface on the corresponding side, thereby controlling the drive mechanism to stop.

[0013] As a preferred technical solution, the opposite sides of the swing arm and the limiting piece are both provided with the extrusion slot, and the side surfaces of the two extrusion slots are both provided with inclined surfaces to form a tapered slot with an entrance larger than the inside.

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

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

[0016] The second task of the present application is achieved by the following technical scheme:

[0017] A dental chair comprises a dental chair seat and a base, the dental chair seat and the base are rotatably connected, and the rotatable connection of the dental chair seat and the base is further provided with the rotation locking mechanism described above.

[0018] Compared with the prior art, the rotation locking mechanism provided by the present application mainly has the following beneficial effects:

[0019] (1) During operation, the moving part is driven to reciprocate by the driving mechanism, thereby driving the extrusion part to insert or retreat from the extrusion groove; the extrusion part can extrude the swing arm to overcome the elastic force of the first spring and rotate the swing arm towards the gear shaft to achieve the locking of the gear shaft when the extrusion part is inserted into the extrusion groove; when the extrusion part retreats from the extrusion groove, the swing arm can be separated from the gear shaft under the elastic force of the first spring to release the locking of the gear shaft, so that the rotation and locking states can be quickly switched, and the gear shaft can be locked at any position within a range of 360 degrees, thereby overcoming the defects of the existing mechanical locking mechanism, such as complicated operation, fixed position, high cost of the electric rotation mechanism, and poor safety, and further improving the safety, practicality and efficiency.

[0020] (2) The side surface of the extrusion part and / or the extrusion groove is provided with a slope, so that the extrusion part can extrude the swing arm to rotate when the extrusion part is inserted into the extrusion groove, the direction of the acting force of the driving mechanism is different from the direction of the reaction force of the gear shaft on the swing arm, and the screw rod and the taper sleeve are in clearance sliding fit, so that the reaction force of the gear on the swing arm does not act on the driving mechanism, but acts on the limiting part through the extrusion part, the service life of the driving mechanism can be greatly increased, the driving force of the driving rod mechanism is not used to directly drive the engagement of the swing arm and the gear shaft, so that the driving mechanism does not need to provide a large driving force, the requirement for the driving mechanism is low, and the cost can be effectively reduced; moreover, the gear shaft is locked by the gear engagement, and the swing arm is prevented from loosening by the limiting part, compared with the friction and magnetic attraction locking schemes, the locking force is limited, the scheme can withstand a large torque, and there is no sliding and locking failure.

[0021] (3) The second spring is arranged, the extrusion part is driven to insert into the extrusion groove by the second spring, when the moving part is driven to the front dead point by the driving mechanism, the second spring can maintain a certain compression amount, so that when there is a cooperation gap between the swing arm and the gear shaft or between the swing arm and the extrusion part due to machining or wear, the extrusion part can be pressed down by the elastic force of the second spring to eliminate the cooperation gap, the swing of the rotation mechanism is effectively reduced, and the stability is increased.

[0022] The concept, specific structure and effects of the present application will be further described below in combination with the drawings to fully understand the purpose, features and effects of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a structural schematic diagram of the rotating locking mechanism in Example 1;

[0024] Figure 2 is a structural schematic diagram of the rotating locking mechanism in Example 1; Figure 1

[0025] Figure 3 is a structural schematic diagram of the cooperation of the gear rotating shaft, the swing arm, the extrusion piece and the limiting piece;

[0026] Figure 4 is a structural schematic diagram of the rotating locking mechanism in Example 1 from a side view;

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

[0028] Wherein, 1-gear rotating shaft; 2-first spring; 3-shaft sleeve; 4-limiting piece; 5-swing arm; 51-extrusion groove; 6-hinge shaft; 7-extrusion piece; 8-second spring; 9-moving piece; 91-advance limiting inclined surface; 92-return limiting inclined surface; 10- micro switch; 101-advance micro switch; 102-return micro switch; 11-screw rod; 12-bracket; 13-guiding block; 14-motor; 15-bottom plate; 16-dental chair seat; 17-rotating locking mechanism. DETAILED DESCRIPTION

[0029] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application. In addition, it should be understood that the use of "first", "second" and similar words in the present application and the claims does not indicate any order, quantity or importance, but is only used to distinguish different components; "one" or "a" and similar words do not indicate a quantity limit, but indicate the existence of at least one; "several", "multiple" and similar words indicate two or more. Unless otherwise indicated, "front", "back", "down", "up" and similar words are only for convenience of description, and are not limited to a position or a spatial orientation. "Mounting", "connecting", "pivoting" and similar words should be understood broadly, which can be directly connected or indirectly connected through intermediate elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0030] Example:

[0031] As Figures 1-4 ​As 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 setting a slope on the side of the extrusion piece 7 and / or the extrusion groove 51, the extrusion piece 7 can be inserted into the extrusion groove 51 to extrude the swing arm 5 to rotate, so that the force direction of the driving mechanism is different from the reaction force direction of the gear shaft 1 on the swing arm 5, and thus the reaction force of the gear on the swing arm 5 will not act on the driving mechanism, but will act on the limiting piece 4 through the extrusion piece 7, which can greatly increase the service life of the driving mechanism, and the driving force of the driving rod mechanism is not used to directly drive the engagement of the swing arm 5 and the gear shaft 1, so a larger driving force is not required for the driving mechanism, and the requirements for the driving mechanism are lower, which can effectively reduce the cost; moreover, the gear shaft is locked by gear engagement, and the limiting piece is used to resist the swing arm to prevent it from loosening, and the locking force of the friction and magnetic attraction schemes is limited, and this scheme can withstand a large torque and does not exist the situation of sliding and being unable to lock.

[0036] (3) By setting the second spring 8, the moving piece 9 drives the extrusion piece 7 to be inserted into the extrusion groove 51 through the second spring 8, and when the driving mechanism drives the moving piece 9 to the front dead point, the second spring 8 can maintain a certain compression amount, so that when there is a fitting gap between the swing arm 5 and the gear shaft 1 or between the swing arm 5 and the extrusion piece 7 due to machining or wear, the second spring 8 can be used to press down the extrusion piece 7 to eliminate the fitting gap, effectively reducing the shaking amount of the rotating mechanism and increasing the stability.

[0037] As a preferred scheme of the present embodiment, the driving mechanism includes a support 12 fixedly connected to the bottom plate 15, a motor 14 mounted on the support 12, and a lead screw 11 driven by the motor 14, and the moving piece 9 is a lead screw nut sleeve threadedly connected with the lead screw 11, so as to be driven by the motor 14 to reciprocate along the lead screw 11. In this scheme, the driving mechanism adopts the motor 14 and the lead screw 11 to drive the moving piece 9 to reciprocate along the lead screw 11, which is simple in structure, convenient to control and stable in work. In other embodiments, the driving mechanism can also adopt the driving mechanisms of the existing technologies such as pneumatic, hydraulic and electromagnetic drive.

[0038] As a preferred scheme of the present embodiment, the extrusion piece 7 is a taper sleeve, one end of the taper sleeve towards the extrusion groove 51 has a smaller diameter, and the second spring 8 is a compression spring sleeved outside the lead screw 11, and the end of the lead screw 11 passes through the middle hole of the taper sleeve and is in sliding fit therebetween. In this scheme, the lead screw 11 and the taper sleeve are in gap sliding fit, so that the reaction force of the gear on the swing arm 5 will not act on the lead screw 11 through the taper sleeve, but will act on the limiting piece 4, and thus the transverse pressure on the lead screw 11 can be effectively avoided to affect the 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 rotating locking mechanism in the embodiment 1 of the present application can be used for rotating and locking the dental chair, and can also be used for the beauty bed, office chair, industrial rotary table and other devices requiring rotation and positioning in other embodiments.

[0045] The above description is merely preferred embodiments of the present application and a description of the technical principles of the application. It should be understood by those skilled in the art that the scope of the application disclosed in the present application is not limited to the above-mentioned embodiments formed by the specific combination of the technical features, and also covers other embodiments formed by any combination of the above-mentioned technical features or equivalent features without departing from the inventive concept. For example, the above-mentioned features are replaced with each other to form embodiments having similar functions disclosed in the present application (but not limited to).

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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