Handrail rotation adjusting mechanism

Abstract

The utility model discloses a handrail rotation adjusting mechanism which comprises a supporting base and a rotating base used for being connected with a handrail body, and the rotating base is rotationally connected to the supporting base. A locking structure is arranged between the supporting seat and the rotating seat, the locking structure comprises a locking hole formed in the rotating seat and a plurality of gear holes uniformly distributed in the supporting seat in the circumferential direction, and an elastically telescopic locking pin is arranged in each gear hole; a button is further arranged on the rotating seat and comprises a pushing and abutting part located in the locking hole. The locking pin in the corresponding gear hole is controlled to be clamped into or separated from the locking hole through the button, so that the rotating seat is switched between a locking state and an unlocking state; the whole mechanism is simple in structure and low in cost, meanwhile, the locking structure matched with the hole and the pin can form bidirectional locking, and the handrail bearing effect and the use experience feeling are improved.

Description

Technical Field

[0001] This utility model relates to the field of seating, and in particular to an armrest rotation adjustment mechanism. Background Technology

[0002] Common office chairs are equipped with armrests on both sides. The armrest assembly includes a mounting base that connects to the chair body, an armrest support rod connected to the mounting base, and an armrest body that is rotatably connected to the top of the armrest support rod. When the armrest is needed, the armrest body can rotate up and down to the corresponding angle to adapt to the user's sitting posture and support their arms.

[0003] For example, in the handrail patent with publication number CN222171709, the handrail includes a rotating seat, a fixed seat, and an angle adjustment device. The rotating seat is rotatably mounted on the fixed seat, which is connected to a fixed plate. The rotating seat is connected to a first rotating plate, and a stepping rotation structure is provided between the first rotating plate and the fixed plate. The stepping rotation structure includes a compression spring, a transmission protrusion, and a transmission groove. Multiple transmission grooves are equidistantly arranged on the fixed plate along its circumference. The transmission protrusion is located on the first rotating plate and is similar to a ratchet structure. Therefore, the first rotating plate has a unidirectional rotation adjustment function. When the handrail is used to support the arm, the first rotating plate will not rotate. When the angle of the handrail needs to be adjusted, the user can simply pull the handrail upwards to adjust it. However, this design has the following shortcomings:

[0004] The angle adjustment device has many components and a relatively complex design. Applying this angle adjustment device to the handrail will increase the cost of the handrail.

[0005] The step-rotation structure is a one-way adjustment mechanism, meaning that once the armrest is adjusted to the correct position, it will not rotate downwards. However, the armrest can rotate upwards under external force. If the user leans back against the armrest, the armrest is likely to tilt upwards, affecting the armrest's support effect and user experience. Summary of the Invention

[0006] This utility model provides a handrail rotation adjustment mechanism. By controlling the locking pin in the corresponding gear hole with a button, the rotating seat can switch between the locked and unlocked states. The entire mechanism has a simple structure and low cost. At the same time, the locking structure with the hole and pin can form a two-way locking, which improves the handrail support effect and user experience.

[0007] The technical solution of this utility model is implemented as follows:

[0008] A handrail rotation adjustment mechanism includes a support base and a rotating base for connecting to the handrail body, the rotating base being rotatably connected to the support base; a locking structure is provided between the support base and the rotating base, the locking structure including a locking hole provided on the rotating base and a plurality of stop holes evenly distributed circumferentially on the support base, each stop hole being provided with a locking pin that can be elastically extended and retracted; the rotating base is also provided with a button, the button including a push part located in the locking hole;

[0009] The handrail rotation adjustment mechanism has a locked state and an unlocked state. In the locked state, the locking hole is aligned with one of the gear holes, and the corresponding locking pin extends out of the gear hole and engages with the locking hole. When the button is pressed, the pushing part acts to retract the locking pin and disengage it from the locking hole. At this time, the rotating seat rotates freely, and the handrail rotation adjustment mechanism switches to the unlocked state. When the rotating seat rotates and aligns the next gear hole with the locking hole, the next locking pin extends out of the corresponding gear hole and engages with the locking hole, causing the handrail rotation adjustment mechanism to switch back to the locked state.

[0010] Preferably, the gear shift hole is provided with an elastic element, which acts on the locking pin and makes the locking pin always tend to extend out of the gear shift hole elastically.

[0011] Preferably, the elastic element is a compression spring acting on the locking pin.

[0012] Preferably, the number of gear holes is two.

[0013] Preferably, when the armrest rotation adjustment mechanism switches from the unlocked state to the locked state, the next locking pin extends elastically and engages with the locking hole, while the pushing part moves in the opposite direction and resets to the initial position, causing the button to automatically reset.

[0014] Preferably, a limiting structure is provided between the button and the rotating base. The limiting structure includes a limiting surface provided on the rotating base and a limiting part provided on the button corresponding to the limiting surface. When the armrest rotation adjustment mechanism is in the locked state, the limiting part abuts against the limiting surface. When the armrest rotation adjustment mechanism is switched to the unlocked state, the limiting part separates from the limiting surface. The limiting structure can prevent the button from detaching from the rotating base after reset.

[0015] Preferably, the rotating seat includes two supports, with a connecting area between the two supports for accommodating the support seat, and a locking hole is provided through the end face of one of the supports, and the multiple position holes are evenly distributed on the end face of the support seat facing the corresponding support.

[0016] Preferably, the outer end face of the support with the locking hole is also provided with a receiving groove, and the locking hole communicates with the receiving groove; the button also includes a pressing cover that matches the receiving groove, the pushing part is connected to the inner end face of the pressing cover, and the pressing cover seals the opening of the receiving groove to ensure the sealing of the receiving groove.

[0017] Preferably, the angular interval between every two gear holes is in the range of 20°-40°.

[0018] Preferably, the angular interval between every two gear holes is 25°-35°.

[0019] The beneficial effects of this utility model, which adopts the above technical solution, are as follows:

[0020] This invention uses buttons to control the locking pins in multiple gear holes to engage or disengage, thereby achieving the rotation adjustment and positioning of the handrail. The entire structure is simple and efficient, with fewer parts and low support cost. Compared to the ratchet structure's one-way positioning of the handrail, the pin hole engagement creates a two-way lock between the rotating seat and the handrail body. Even if the user leans back on the handrail after it is positioned, the handrail will not tilt upwards, improving the handrail's support effect and user experience. Attached Figure Description

[0021] Figure 1 This is a structural diagram of the handrail device;

[0022] Figure 2 This is an exploded view of the handrail assembly.

[0023] Figure 3 This is an enlarged view of the positions of the rotating seat and connecting seat in the exploded view of the handrail device;

[0024] Figure 4 A sectional view showing the position of the rotating seat;

[0025] Figure 5 This is a schematic diagram showing the handrail rotating upwards and stopping at a predetermined position.

[0026] Figure 6 This is a sectional view showing the location of the connector.

[0027] Figure 7 This is a schematic diagram showing the handrail rotating upwards and stopping at a predetermined position.

[0028] Figure 8 This is a structural diagram of a push-button switch;

[0029] Figure 9 This is a structural diagram of the push-button switch in Example 2;

[0030] The reference numerals in the attached drawings are as follows: 1-mounting base, 2-handrail support rod, 3-rotating base, 4-handrail body, 5-button, 6-cover, 7-body, 11-support part, 12-locking element, 13-locking groove, 14-stop cover, 15-positioning component, 21-connecting base, 22-support base, 51-pushing part, 52-limiting part, 53-locking pin, 54-compression spring, 71-elastic part, 71a-starting elastic part, 72-pressing end, 72a-end elastic part, 73-locking part, 74-deformation space, 111-hemispherical groove, 211-rotating shaft hole, 212-guide groove, 213-recessed hole, 221-positioning hole, 311-locking hole, 321-limiting surface. Detailed Implementation

[0031] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0032] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0033] This utility model has multiple embodiments, and the specific implementation methods are as follows:

[0034] Example 1: As Figure 1-8 As shown, this embodiment provides an armrest device, which includes an armrest control mechanism and an armrest rotation adjustment mechanism. The armrest device includes a mounting base 1 and an armrest support rod 2. The mounting base 1 is used to connect with the chair body. The bottom end of the armrest support rod 2 is rotatably connected to the mounting base 1. The armrest rotation adjustment mechanism includes a support seat 22 at the top of the armrest support rod 2 and a rotating seat 3 for connecting with the armrest body 4. The rotating seat 3 is rotatably connected to the support seat 22. A locking structure is provided between the support seat 22 and the rotating seat 3. The locking structure includes a locking hole 311 provided on the rotating seat 3 and a plurality of stop holes 221 evenly distributed circumferentially on the support seat 22. Each stop hole 221 is provided with a locking pin 53 that can be elastically extended and retracted. The rotating seat 3 is also provided with a button 5. The button 5 includes a pushing part 51 located in the locking hole 311. The pushing part 51 is a rod-shaped structure.

[0035] The handrail rotation adjustment mechanism has a locked state and an unlocked state. In the locked state, the locking hole 311 is aligned with one of the gear holes 221, and the corresponding locking pin 53 extends out of the gear hole 221 and engages with the locking hole 311. When the button 5 is pressed, the pushing part 51 actuates the locking pin 53, which retracts and disengages from the locking hole 311. At this time, the rotating seat 3 rotates freely, and the handrail rotation adjustment mechanism switches to the unlocked state. When the rotating seat 3 rotates and aligns the next gear hole 221 with the locking hole 311, the next locking pin 53 extends out of the corresponding gear hole 221 and engages with the locking hole 311, causing the handrail rotation adjustment mechanism to switch back to the locked state.

[0036] Furthermore, in order to ensure that the locking pin 53 always has the tendency to extend outward elastically, an elastic element is provided in the gear hole 221 in this embodiment. The elastic element is a compression spring 54 acting on the locking pin 53. When the locking hole 311 is aligned with one of the gear holes 221, the compression spring 54 in the gear hole 221 corresponding to the position of the locking hole 311 is in the reset state, and the compression springs 54 in the other gear holes 221 are in the compressed state. When the pushing part 51 acts on the locking pin 53 to disengage from the locking hole 311, the corresponding compression spring 54 is compressed to store the elastic force that causes the locking pin 53 to extend outward elastically.

[0037] Furthermore, in this embodiment, the number of shift holes 221 is preferably two. The angle positions of these two shift holes 211 correspond to the horizontal support state and the inclined support state of the armrest body 4, respectively. For example, when the locking pin 53 in the clockwise shift hole 221 is engaged in the locking hole 311, the armrest body 4 remains in the horizontal support position. When the armrest body 4 is subjected to force and drives the rotating seat 3 to rotate counterclockwise to the counterclockwise shift hole 221, the locking pin 53 inside the counterclockwise shift hole 221 pops out and engages in the locking hole, so that the armrest body 4 remains in the inclined support state.

[0038] Furthermore, the reset of button 5 is also achieved by compression spring 54. When the armrest rotation adjustment mechanism switches from the unlocked state to the locked state, the next locking pin 53 extends elastically and engages with the locking hole 311, while the pushing part 51 moves in the opposite direction and resets to the initial position. There is no need to set a separate reset part between button 5 and rotating seat 3, so the button can be automatically reset.

[0039] Furthermore, to prevent button 5 from disengaging from rotating base 3, a limiting structure is provided between button 5 and rotating base 3. The limiting structure includes a limiting surface 321 provided on rotating base 3, and a limiting part 52 on button 5 corresponding to the limiting surface 321. The limiting part 52 is a protruding buckle structure. When the armrest rotation adjustment mechanism is in the locked state, the limiting part 52 abuts against the limiting surface 321. When the armrest rotation adjustment mechanism is switched to the unlocked state, the limiting part 52 separates from the limiting surface 321. In addition, while limiting button 5 from disengaging from rotating base 3, the limiting structure also limits the pushing part 51 from leaving the locking hole 311. Therefore, after locking pin 53 is inserted into locking hole 311, pushing part 51 can also limit locking pin 53 from disengaging from gear hole 221, so that locking pin 53 is stably maintained between locking hole 311 and gear hole 211.

[0040] Furthermore, the structure of the rotating seat 3 and the support seat 2 is as follows: The rotating seat 3 includes two supports 31, and a connection area for accommodating the support seat 22 is formed between the two supports 31. A locking hole 311 is provided through the end face of one of the supports 31. The support seat 22 has a plurality of position holes 221 evenly distributed on the end face facing the corresponding support 31. The outer end face of the support 31 with the locking hole 311 is also provided with an accommodating groove, and the locking hole 311 communicates with the accommodating groove. The outer end of the other support also has a groove, and a cover 6 is detachably connected to the groove. The button 5 also includes a pressing cover that matches the accommodating groove. A pushing part 51 is connected to the inner end face of the pressing cover, and the pressing cover seals the opening of the accommodating groove to ensure the sealing of the accommodating groove and to make it look more aesthetically pleasing.

[0041] Furthermore, the angular interval between every two gear holes 221 needs to be within a reasonable range. The angular interval refers to the included angle formed between the two lines connecting the center of every two adjacent gear holes 211 and the rotation center point. If the angular interval between two gear holes 221 is too close, it will make the two gear holes 221 too tightly packed, making the structural layout of the rotating seat 3 too crowded. If the angular interval between two gear holes 221 is too far, it will make it difficult for the armrest body 4 to stay in the position required by the user. Therefore, in this embodiment, the angular interval between every two gear holes 221 is between 20° and 40°, and the angular interval between every two gear holes 221 is particularly preferably between 25° and 35°.

[0042] Furthermore, the armrest control mechanism in this embodiment is mainly used to control the forward and backward rotation angle of the armrest support rod 2, so as to ensure that when the chair with the armrest device is installed needs to be stored under the table, the armrest body 4 will not interfere with the table. The armrest control mechanism includes a push switch, a mounting base 1, and an armrest support rod 2. The mounting base 1 and the armrest support rod 2 constitute an armrest assembly. The lower end of the armrest support rod 2 is provided with a connecting part 21, and the mounting base 1 is provided with a corresponding support part 11. The connecting part 21 is provided with a through pivot hole 211. The support part 11 is inserted into the pivot hole 211, so that the connecting part 21 is rotatably connected to the support part 11. The outer end of the support part 11 is connected with a locking member 12, and the locking member 12 is provided with a locking groove 1. 3; The push-button switch is located between the support part 11 and the connecting part 21. The push-button switch includes a body 7, and a locking part 73 is provided on the body 7. One end of the body 7 is a pressing end 72, and the other end of the body 7 has an elastic body that extends outward integrally. When the handrail support rod 2 is in the locked state, the locking part 73 is in the locking groove 13. When an external force is applied to the pressing end 72, the elastic body deforms elastically, and the locking part 73 disengages from the locking groove 13. At this time, the handrail support rod 2 switches to the unlocked state where it can rotate freely. The elastic body is integrally formed with the body 7, so there is no need to install a spring on the body 7 again. After the push-button switch is subjected to force, the elastic body can deform to provide a reset force, eliminating the spring assembly step and improving assembly efficiency.

[0043] Furthermore, in this embodiment, the elastic body includes multiple elastic portions 71 that gradually move away from the body 7. To facilitate elastic deformation, the elastic portions 71 are sheet structures, and the cross-sectional shape formed between each two adjacent elastic portions 71 is V-shaped. The thickness of the elastic body is less than the thickness of the body 7. Each two adjacent elastic portions 71 are integrally formed and a deformation space 74 is formed. The multiple elastic portions 71 include an initial elastic portion 71a that is directly and integrally connected to the body 7. The initial elastic portion 71a extends outward at an angle and also forms a deformation space 74 with the body 7. When the switch is pressed, the elastic portion 71 deforms within the formed space 71 to provide an elastic force that resets the body 7.

[0044] Furthermore, having too many elastic parts 71 would make the push-button switch too long and take up too much space, making it difficult to have only two elastic parts 71.

[0045] Furthermore, in order to increase the contact area between the end elastic portion 71b and the support portion 11 at the end of the elastomer, so that the elastic portion 71 can generate elastic deformation better, the end elastic portion 71b extends in a direction parallel to the end face of the body 7 to form a flat contact surface. The user only needs to press the pressing end 72 lightly, and the elastic portion 71 can generate elastic deformation.

[0046] Furthermore, in order to restrict the direction of movement of the main body 7, the outer end of the connecting part 21 is provided with a pressing guide groove 212 extending along the length direction of the pressing switch. The main body 7 of the pressing switch is slidably connected in the guide groove 212 to ensure that the main body 7 moves along its own length direction without shifting its position after being subjected to external force.

[0047] Furthermore, in order to meet the user's storage needs, the rotation angle of the handrail support rod 2 needs to be relatively large. However, if the rotation angle of the handrail support rod 2 is too large, the handrail body 4 is likely to come into contact with the ground. Therefore, in order to balance both, in this embodiment, when the handrail support rod 2 is switched to the unlocked state, the rotation angle range of the handrail support rod 2 is 80°-110°.

[0048] Furthermore, the locking member 12 is an end cap connected to the outer end of the support part 11. To facilitate the installation of the locking member 12, the outer end of the connecting part 21 is open and has an opening. A cover 14 is installed at the opening. After the locking member 12 is installed, the cover 14 is detachably connected to the end cap. The detachable connection is usually a snap-fit ​​connection.

[0049] Furthermore, the connecting part 21 and the mounting base 1 also have a positioning structure to position the handrail support rod 2 after it has rotated backward into place; wherein the inner end face of the connecting part 21 is in close contact with the outer end face of the mounting base 1, and the positioning structure includes a recess 213 opened on the inner end face of the connecting part 21, and a positioning component 15 is provided in the recess 213. The positioning component 15 is an existing component, including a hollow base and a limiting ball in the base. The limiting ball is elastically extended and retracted by a spring in the base, and the hemispherical surface of the limiting ball protrudes outside the base; a plurality of hemispherical grooves 111 are arranged circumferentially on the outer end face of the mounting base 1. The limiting ball elastically extends and retracts and is inserted into the corresponding hemispherical grooves 111, so that the handrail support rod 2 after rotating backward to the predetermined position is held in the corresponding position.

[0050] Example 2: Figure 9 As shown, in this embodiment, the elastic body is a single body and is a sheet. The cross-sectional shape formed between the elastic body and the body 7 is also V-shaped. The single elastic body occupies less space and is easier to place between the locking member 12 and the connecting part 21, thus achieving the same effect as in the above embodiment.

[0051] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A handrail rotation adjustment mechanism, characterized by, The device includes a support base (22) and a rotating base (3) for connecting to the handrail body (4). The rotating base (3) is rotatably connected to the support base (22). A locking structure is provided between the support base (22) and the rotating base (3). The locking structure includes a locking hole (311) provided on the rotating base (3) and multiple stop holes (221) evenly distributed circumferentially on the support base (22). Each stop hole (221) is provided with a locking pin (53) that can be elastically extended and retracted. The rotating base (3) is also provided with a button (5). The button (5) includes a push part (51) located in the locking hole (311). The handrail rotation adjustment mechanism has a locked state and an unlocked state. In the locked state, the locking hole (311) is aligned with one of the gear holes (221), and the corresponding locking pin (53) extends out of the gear hole (221) and is engaged in the locking hole (311). When the button (5) is pressed, the pushing part (51) acts to retract the locking pin (53) and disengage it from the locking hole (311). At this time, the rotating seat (3) rotates freely, and the handrail rotation adjustment mechanism switches to the unlocked state. When the rotating seat (3) rotates and aligns the next gear hole (221) with the locking hole (311), the next locking pin (53) extends out of the corresponding gear hole (221) and is engaged in the locking hole (311), so that the handrail rotation adjustment mechanism switches back to the locked state.

2. A handrail rotation adjustment mechanism according to claim 1, wherein: The gear hole (221) is provided with an elastic element, which acts on the locking pin (53) and makes the locking pin (53) always tend to extend out of the gear hole (221).

3. A handrail rotation adjustment mechanism according to claim 2, wherein: The elastic element is a compression spring (54) acting on the locking pin (53).

4. A handrail rotation adjustment mechanism according to claim 1, wherein: There are two gear shift holes (221).

5. A handrail rotation adjustment mechanism according to claim 1, wherein: When the armrest rotation adjustment mechanism switches from the unlocked state to the locked state, the next locking pin (53) extends elastically and engages with the locking hole (311) at the same time acting to push the part (51) in the opposite direction and reset to the initial position.

6. A handrail rotation adjustment mechanism according to claim 1, wherein: A limiting structure is provided between the button (5) and the rotating seat (3). The limiting structure includes a limiting surface (321) provided on the rotating seat (3). The button (5) is provided with a limiting part (52) corresponding to the limiting surface (321). When the armrest rotation adjustment mechanism is in the locked state, the limiting part (52) abuts against the limiting surface (321). When the armrest rotation adjustment mechanism is switched to the unlocked state, the limiting part (52) separates from the limiting surface (321).

7. A handrail rotation adjustment mechanism according to claim 1, wherein: The rotating seat (3) includes two supports (31), and a connection area for accommodating the support seat (22) is formed between the two supports (31). A locking hole (311) is provided through the end face of one of the supports (31), and the support seat (22) has a plurality of stop holes (221) evenly distributed on the end face of the support seat (22) facing the corresponding support (31).

8. A handrail rotation adjustment mechanism according to claim 7, wherein: The support (31) with a locking hole (311) is also provided with a receiving groove on the outer end face, and the locking hole (311) is connected to the receiving groove; the button (5) also includes a pressing cover that matches the receiving groove, the pushing part (51) is connected to the inner end face of the pressing cover, and the pressing cover seals the opening of the receiving groove.

9. A handrail rotation adjustment mechanism according to claim 1, wherein: The angular interval between every two gear holes (221) is 20°-40°.

10. A handrail rotation adjustment mechanism according to claim 9, wherein: The angular interval between each two gear holes (221) ranges from 25° to 35°.

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