Armrest

Abstract

The utility model relates to the technical field of dental instruments and equipment, in particular to a handrail which comprises a support, a handle, a locking piece used for locking a fixing part of the handle, an elastic piece arranged between the support and the locking piece, a limiting piece and a pressing piece used for unlocking the locking piece. And the fixed part of the handle is provided with a clamping position matched with the locking piece. The side, away from the clamping position, of the fixing part is matched with the limiting piece to limit the rotating amplitude of the handle. A push rod is arranged on the locking piece, and one end of the push rod sequentially penetrates through the fixing part and the limiting piece to be fixedly connected to the pressing piece. When the handle needs to be used, the pressing piece is pressed to drive the locking piece to be separated from the clamping position, and the handle swings downwards under the acting force of self weight, rotates by a set amplitude under the limiting effect of the limiting piece and is fixed. When the handle is lifted upwards, the locking piece is automatically clamped into the clamping position under the restoring acting force of the elastic piece so as to fix the handle. The handle can realize accurate angle rotation positioning and locking, the use is very convenient, the structure is simple, the layout is compact, and the cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of dental instruments and equipment, in particular to an armrest. Background Art

[0002] Oral health is an important part of overall health. Various oral diseases not only reduce people's quality of life, but are also closely related to various systemic diseases throughout the body. With the improvement of people's living standards and oral health awareness, the frequency of people receiving oral treatment has gradually increased. Dental chairs are essential medical equipment for oral treatment, which are used by dentists to diagnose and treat patients and provide a comfortable medical environment for oral patients. Conventional armrests are adjusted by pressing or lifting the armrests, which is inconvenient to use. Or the armrest support frame and armrest handle are driven by a locking motor to swing, which is costly and occupies a large space. Utility Model Content

[0003] In order to solve the technical defects mentioned in the above background technology, the purpose of the utility model is to provide a handrail.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] An armrest, comprising a bracket mounted on a dental chair, a handle, a lock for locking a fixed portion of the handle, an elastic member arranged between the bracket and the lock, a limiter for limiting the rotation range of the handle, and a pressing member for unlocking the lock; the fixed portion of the handle is provided with a clamping position cooperating with the lock; a side of the fixed portion away from the clamping position cooperates with the limiter to limit the rotation range of the handle; a push rod is provided on the lock, one end of which passes through the fixed portion and the limiter in sequence and is fixedly connected to the pressing member; a gap is provided between the end surface of the pressing member and the end surface of the limiter;

[0006] When the pressing member is subjected to an external force, the gap is reduced, the locking member is separated from the locking position of the fixing portion, the elastic member is compressed, and the handle is rotated to a set amplitude under the action of its own weight; when resetting, the handle is manually rotated in the opposite direction so that the locking member is locked in the locking position under the restoring force of the elastic member, and the pressing member returns to its initial state under the action of the push rod.

[0007] By adopting the above technical solution, the handle is fixed in the initial position by the locking part and the fixing part. When the handle needs to be used, the pressing part is pressed to drive the locking part out of the locking position, and the handle swings downward under the force of its own weight, and rotates to a set amplitude and is fixed under the limiting action of the limiter. When the handle needs to be restored to the initial state, the handle is lifted and rotated, and the locking part automatically snaps into the locking position under the restoring force of the elastic part to fix the handle. The handle can achieve precise angle rotation positioning and locking, is very convenient to use, has a simple structure, is compactly arranged, and reduces costs.

[0008] Furthermore, a limiting column is provided on the side of the fixing portion away from the clamping position, and an arc-shaped limiting groove is provided on the side of the limiting member facing the fixing portion. The limiting column is slidably arranged in the limiting groove, and the length of the limiting groove is used to limit the swing amplitude of the handle, which can improve the control accuracy and make it more convenient to use.

[0009] Furthermore, the fixing portion is provided with two said clamping positions at intervals, and two positioning posts are correspondingly provided on the locking element, and one said positioning post is clamped in each clamping position, so as to improve the stability of the clamping connection.

[0010] Furthermore, the fixing portion is provided with a mounting groove, and the bottom of the mounting groove is provided with the clamping position and the inner hole for installing the push rod. The handrail also includes a flange, and the flange includes a flange seat and a connecting shaft. The flange seat is fixed in the mounting groove, one end of the connecting shaft is fixedly connected to the flange seat, and the other end of the connecting shaft passes through the inner hole, and the limiter is threadedly connected with a nut to fix the flange seat and the limiter. A through slot is provided inside the flange seat and the connecting shaft, and the push rod passes through the through slot and is connected to the pressing member; a movable slot is provided on the side of the flange away from the connecting shaft, and the ends of the elastic member and the locking member are located in the movable slot, which has a compact structure and saves space and cost. The flange is provided with a through hole corresponding to the positioning column, and the positioning column passes through the through hole. The inner side of the outermost pressing member will not contact the surface of the handle, and can be ejected together with the push rod, making it more convenient to press.

[0011] Furthermore, a gasket is provided inside the side of the limiting member facing away from the limiting groove, and the gasket is provided between the nut and the limiting member, which can increase the force-bearing area and improve the stability of the fixing of the limiting member.

[0012] Furthermore, a rubber ring is sleeved on the outer circumference of the connecting shaft, and the rubber ring is interference-connected in the inner hole. The rubber ring can rub against the inner cavity of the inner hole to play a damping role, so that the handrail falls slowly, preventing accidental injury to personnel and improving safety performance.

[0013] Furthermore, an iron ring is provided at the bottom of the installation groove of the fixing portion, and the side surface of the iron ring abuts against the side surface of the flange seat, which can extend the service life.

[0014] Furthermore, the pressing member is configured as a cover-shaped structure, a fixing hole is provided at the center of the pressing member, and the end of the push rod is clamped in the fixing hole, so that installation and disassembly are convenient.

[0015] Furthermore, the push rod is hollow inside, and the pressing member is fixedly connected to the push rod by a countersunk screw. One end of the countersunk screw is clamped on the outside of the fixing hole, and the other end of the countersunk screw passes through the fixing hole and is threadedly connected to the inside of the push rod, so that the connection is more stable and the linkage efficiency of the pressing is improved.

[0016] Furthermore, the elastic member is configured as a tower-shaped spring structure, and the end of the elastic member with a larger end surface area is connected to the bracket, so that the pressure-bearing area can be increased to concentrate the elastic deformation force on the lock member, thereby improving the efficiency of resetting.

[0017] In summary, the beneficial effects of the utility model are:

[0018] The handle in the utility model is fixed in the initial position by the locking part and the fixing part. When the handle needs to be used, the pressing part is pressed to drive the locking part out of the locking position, and the handle swings downward under the action of its own weight, and rotates to a set amplitude and is fixed under the limiting action of the limiter. When the handle needs to be restored to the initial state, the handle is lifted and rotated, and the locking part automatically snaps into the locking position under the restoring force of the elastic part to fix the handle. The handle can achieve precise angle rotation positioning and locking, is very convenient to use, has a simple structure, is compactly arranged, and reduces costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the handrail of the utility model.

[0020] Figure 2 It is a schematic diagram of the exploded structure of the handrail of the utility model.

[0021] Figure 3 It is a schematic cross-sectional structure diagram of the armrest of the utility model in a locked state.

[0022] Figure 4 It is a structural schematic diagram of a handle of an armrest of the utility model.

[0023] Figure 5 It is a structural schematic diagram of a position limiting member of an armrest of the utility model.

[0024] Description of reference numerals in the figures:

[0025] 1. Armrest; 2. Bracket; 3. Handle; 31. Fixing part; 311. Inner hole; 32. Iron ring; 33. Limiting column; 34. Positioning; 4. Locking piece; 41. Push rod; 42. Positioning column; 5. Elastic piece; 6. Flange; 61. Flange seat; 62. Connecting shaft; 63. Rubber ring; 64. Nut; 7. Limiting piece; 71. Limiting groove; 72. Gasket; 8. Pressing piece; 81. Fixing hole; 82. Countersunk screw. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the utility model.

[0027] Those skilled in the art should understand that, in the disclosure of the present invention, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0028] In the description of the utility model, if there is a word description such as "several", it means one or more, and the meaning of "more" is two or more. Greater than, less than, and more than are understood to exclude the number itself, and above, below, and within are understood to include the number itself. If there is a description of the first, second, and third, it is only used to distinguish the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0029] The following is combined with Figure 1-5 , the embodiments of the utility model are further described in detail.

[0030] A handrail 1, such as Figure 1 , Figure 2 , Figure 3As shown, it includes a bracket 2 mounted on a dental chair, a handle 3, a lock 4 for locking a fixed portion 31 of the handle 3, an elastic member 5 arranged between the bracket 2 and the lock 4, a limiter 7 for limiting the rotation range of the handle 3, and a pressing member 8 for unlocking the lock 4. The fixed portion 31 of the handle 3 is provided with a clamping position 34 that cooperates with the lock 4. The side of the fixed portion 31 away from the clamping position 34 cooperates with the limiter 7 to limit the rotation range of the handle 3. A push rod 41 is provided on the lock 4, and one end of the push rod 41 passes through the fixed portion 31 and the limiter 7 in sequence and is fixedly connected to the press 8. A gap is provided between the end surface of the press 8 and the end surface of the limiter 7 to facilitate the movement of the press 8.

[0031] When the pressing member 8 is acted upon by an external force, the gap is reduced, the locking member 4 is separated from the locking position 34 of the fixing portion 31, the elastic member 5 is compressed, and the handle 3 rotates by a set amplitude under the action of its own weight. When resetting, the handle 3 is manually rotated in the opposite direction so that the locking member 4 is locked in the locking position 34 under the restoring force of the elastic member 5, and the pressing member 8 returns to the initial state under the action of the push rod 41.

[0032] The handle 3 is fixed in the initial position by the locking member 4 and the locking position 34 of the fixing part 31. When the handle 3 needs to be used, the pressing member 8 is pressed to drive the locking member 4 out of the locking position 34, and the handle 3 swings downward under the force of its own weight, and rotates to a set amplitude and is fixed under the limiting action of the limiting member 7. When the handle 3 needs to be restored to the initial state, the handle 3 is lifted and rotated, and the locking member 4 is automatically locked into the locking position 34 under the restoring force of the elastic member 5 to fix the handle 3. The handle 3 can realize precise angle rotation positioning and locking, is very convenient to use, has a simple structure, is compactly arranged, and reduces costs.

[0033] In this embodiment, please refer to Figure 2 , Figure 4 A limiting column 33 is provided on the side of the fixing portion 31 away from the locking position 34, and an arc-shaped limiting groove 71 is provided on the side of the limiting member 7 facing the fixing portion 31. The limiting column 33 is slidably arranged in the limiting groove 71, and the length of the limiting groove 71 is used to limit the swing amplitude of the handle 3, which can improve the control accuracy and make it more convenient to use. Among them, the limiting member 7 is set to a plastic structure to save costs.

[0034] The fixing portion 31 is provided with two latching positions 34 at intervals, and the locking member 4 is provided with two positioning posts 42 correspondingly. A positioning post 42 is clamped in each latching position 34 to improve the stability of the clamping connection.

[0035] In this embodiment, the fixing portion 31 is provided with a mounting groove, and the bottom of the mounting groove is provided with a clamping position 34 and an inner hole 311 for installing the push rod 41. Specifically, the bottom of the mounting groove of the fixing portion 31 is also provided with an iron ring 32, and the side of the iron ring 32 abuts against the side of the flange seat 61. When rotating, the side of the iron ring 32 rubs against the side of the flange seat 61 and the end face of the positioning column 42, which can reduce the loss and thus extend the service life. Among them, the iron ring 32 and the fixing portion 31 are injection molded. Among them, the iron ring 32 and the fixing portion 31 are jointly provided with two clamping positions 34, and the two clamping positions 34 are set as a hole-type structure.

[0036] The handrail 1 also includes a flange 6, which includes a flange seat 61 and a connecting shaft 62. The flange seat 61 is fixed in the installation groove, one end of the connecting shaft 62 is fixedly connected to the flange seat 61, and the other end of the connecting shaft 62 passes through the inner hole 311, and the stopper 7 is threadedly connected to the nut 64 to fix the flange seat 61 and the stopper 7. A through slot is provided inside the flange seat 61 and the connecting shaft 62, and the push rod 41 passes through the through slot and is connected to the pressing member 8. A movable slot is provided on the side of the flange 6 away from the connecting shaft 62, and the ends of the elastic member 5 and the locking member 4 are located in the movable slot, which has a compact structure and saves space and cost. The bracket 2 is screwed to the flange seat 61 to fix the entire handrail 1. A through hole is provided in the flange 6 corresponding to the positioning column 42, and the positioning column 42 passes through the through hole to facilitate the fixing of the handle 3. The inner side of the outermost pressing member 8 will not contact the surface of the handle 3, and can be ejected together with the push rod 41, making it more convenient to press.

[0037] For details, please refer to Figure 2 , Figure 3 , Figure 5 The limiting member 7 is set as a cylindrical structure, and a gasket 72 is arranged inside the limiting member 7 on the side away from the limiting groove 71. The pressing member 8 is movably arranged in the limiting member 7, and the end surface area of ​​the gasket 72 is smaller than the end surface area of ​​the pressing member 8, providing more sufficient space for the movement of the pressing member 8.

[0038] A gasket 72 is disposed inside the limiting member 7 on one side away from the limiting groove 71. The gasket 72 is disposed between the nut 64 and the limiting member 7 to increase the force bearing area and improve the stability of the fixing of the limiting member 7. The gasket 72 can increase the force bearing area of ​​the limiting member 7 to facilitate the movement of the push rod 41 and the lock member 4.

[0039] The outer peripheral side of the connecting shaft 62 is sleeved with a rubber ring 63, which is interference-connected in the inner hole 311. The rubber ring 63 can rub against the inner cavity of the inner hole 311 to play a damping role, so that the handrail 1 falls slowly, prevents accidental injury to personnel, and improves safety performance.

[0040] In this embodiment, the pressing member 8 is configured as a cover-shaped structure, a fixing hole 81 is provided at the center of the pressing member 8, and the end of the push rod 41 is clamped in the fixing hole 81, so that installation and removal are convenient.

[0041] In order to improve the stability of the connection between the push rod 41 and the pressing member 8, the push rod 41 is hollow inside, and the pressing member 8 is fixedly connected to the push rod 41 by a countersunk screw 82. One end of the countersunk screw 82 is clamped on the outside of the fixing hole 81, and the other end of the countersunk screw 82 passes through the fixing hole 81 and is threadedly connected to the inside of the push rod 41, so that the connection is more stable and the linkage efficiency of the pressing is improved. Of course, the other end of the countersunk screw 82 can also be directly fixed to the inside of the push rod 41 by interference fit.

[0042] The elastic member 5 is configured as a tower-shaped spring structure, and the end of the elastic member 5 with a larger end surface area is connected to the bracket 2. The pressure-bearing area can be increased so that the elastic deformation force is concentrated on the lock member 4, thereby improving the efficiency of resetting. Of course, other elastic structures can also be configured, and a spring structure is preferred in this solution.

[0043] When in use, the armrest 1 is put down. The positioning column 42 of the lock 4 is stuck in the two positions 34 of the iron ring 32 of the fixed part 31 (the iron ring 32 is embedded to prevent the plastic of the fixed part 31 from being worn). When the hand pushes the pressing part 8, the lock 4 is pushed at the same time, and the elastic part 5 (reset function) is squeezed. When the positioning columns 42 on both sides of the lock 4 completely withdraw from the two positions 34 on the iron ring 32, the handle 3 automatically rotates downward due to its own gravity. The rotation range of the handle 3 is limited by the limiting member 7. The limiting groove 71 is designed, and the fixing part 31 is provided with a limiting column 33. The rotation range of the handle 3 is limited by the length of the limiting groove 71, so as to achieve the purpose of putting down the armrest 1. The rubber ring 63 is installed on the connecting shaft 62. The rubber ring 63 rubs against the inner cavity of the inner hole 311 to play a damping role, so that the handle 3 falls slowly to prevent accidental injury to people.

[0044] Reset the armrest 1: Lift the handle 3 directly by hand and turn it counterclockwise. When the two positioning columns 42 of the lock 4 encounter the two locking positions 34 of the handle 3, it will be reset under the action of the elastic member 5. The two positioning columns 42 will immediately lock into the corresponding locking positions 34, and immediately lock the handle 3 to achieve a fixing effect.

[0045] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A handrail (1), characterized in that: The dental chair comprises a bracket (2) mounted on the dental chair, a handle (3), a lock (4) for locking a fixed portion (31) of the handle (3), an elastic member (5) arranged between the bracket (2) and the lock (4), a limiter (7) for limiting the rotation range of the handle (3), and a pressing member (8) for unlocking the lock (4); the fixed portion (31) of the handle (3) is provided with a clamping position (34) cooperating with the lock (4); a side of the fixed portion (31) away from the clamping position (34) cooperates with the limiter (7) to limit the rotation range of the handle (3); a push rod (41) is provided on the lock (4), one end of the push rod (41) passes through the fixed portion (31) and the limiter (7) in sequence and is fixedly connected to the press (8); a gap is provided between the end surface of the press (8) and the end surface of the limiter (7); When the pressing member (8) is subjected to an external force, the gap is reduced, the locking member (4) is separated from the locking position (34) of the fixing portion (31), the elastic member (5) is compressed, and the handle (3) is rotated to a set amplitude under the action of its own weight; when resetting, the handle (3) is manually rotated in the opposite direction so that the locking member (4) is locked in the locking position (34) under the restoring force of the elastic member (5), and the pressing member (8) returns to its initial state under the action of the push rod (41).

2. The handrail (1) according to claim 1, characterized in that: A limiting column (33) is arranged on the side of the fixing portion (31) facing away from the locking position (34), and an arc-shaped limiting groove (71) is arranged on the side of the limiting member (7) facing the fixing portion (31). The limiting column (33) is slidably arranged in the limiting groove (71), and the length of the limiting groove (71) is used to limit the swing amplitude of the handle (3).

3. The handrail (1) according to claim 2, characterized in that: The fixing portion (31) is provided with two latching positions (34) at intervals, and the locking element (4) is provided with two positioning posts (42) correspondingly, and each latching position (34) is provided with one positioning post (42).

4. The handrail (1) according to claim 3, characterized in that: The fixing portion (31) is provided with a mounting groove, the bottom of the mounting groove is provided with the clamping position (34) and an inner hole (311) for mounting the push rod (41); the handrail (1) also includes a flange (6), the flange (6) includes a flange seat (61) and a connecting shaft (62), the flange seat (61) is fixed in the mounting groove, one end of the connecting shaft (62) is fixedly connected to the flange seat (61), and the other end of the connecting shaft (62) passes through the inner hole (311), the limiting member (7) and the nut (6 4) threaded connection to fix the flange seat (61) and the limit member (7); a through slot is provided inside the flange seat (61) and the connecting shaft (62), and the push rod (41) passes through the through slot to be connected to the pressing member (8); a movable slot is provided on the side of the flange (6) away from the connecting shaft (62), and the ends of the elastic member (5) and the locking member (4) are located in the movable slot; a through hole is provided on the flange (6) corresponding to the positioning column (42), and the positioning column (42) passes through the through hole.

5. The handrail (1) according to claim 4, characterized in that: A gasket (72) is provided inside the limiting member (7) at a side facing away from the limiting groove (71), and the gasket (72) is provided between the nut (64) and the limiting member (7).

6. The handrail (1) according to claim 4, characterized in that A rubber ring (63) is sleeved on the outer circumference of the connecting shaft (62), and the rubber ring (63) is interference-connected in the inner hole (311).

7. The handrail (1) according to claim 4, characterized in that An iron ring (32) is also provided at the bottom of the installation groove of the fixing portion (31), and the side surface of the iron ring (32) abuts against the side surface of the flange seat (61).

8. The handrail (1) according to claim 1, characterized in that The pressing piece (8) is configured as a cover-shaped structure, a fixing hole (81) is provided at the center of the pressing piece (8), and an end of the push rod (41) is clamped in the fixing hole (81).

9. The handrail (1) according to claim 8, characterized in that The interior of the push rod (41) is hollow, and the pressing member (8) is fixedly connected to the push rod (41) by a countersunk screw (82); one end of the countersunk screw (82) is clamped on the outside of the fixing hole (81), and the other end of the countersunk screw (82) passes through the fixing hole (81) and is threadedly connected to the interior of the push rod (41).

10. The handrail (1) according to claim 1, characterized in that The elastic member (5) is configured as a tower-shaped spring structure, and the end of the elastic member (5) with a larger end surface area is connected to the bracket (2).

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