Stepless adjustment chair back controlled by handle

Abstract

The utility model discloses a stepless adjusting chair back controlled by a handle, which comprises a support and a backrest which are matched with each other in a rotating manner, and a stepless adjusting mechanism and a handle component are arranged between the support and the backrest. The stepless adjusting mechanism comprises a sleeve, a telescopic piece, a spring bolt, a rack and a gear, the sleeve is rotationally matched with the backrest, the telescopic piece is rotationally matched with the support, the rack is fixed in the mounting cavity and connected with the sleeve, the gear is rotationally connected with the two sides of the mounting cavity and meshed with the rack, and the spring bolt is slidably arranged in the mounting cavity. The handle assembly is connected with the spring bolt and can drive the spring bolt to be close to or away from the gear, and unlocking and locking are achieved. By means of the design, linear stepless adjustment of the chair back can be achieved, compared with traditional multi-gear adjustment, a user can conveniently and accurately adjust the gradient of the chair back by operating a handle, and the comfort level and adaptability of the chair are greatly improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to chair technical field, specifically to a handle control's stepless adjustment chair back. BACKGROUND

[0002] In modern seat design, the adjustability of the chair back plays a key role in the comfort experience of the user. At present, a large number of seat products on the market adopt the chair back adjustment mode of multiple gears. This mode mainly sets multiple predetermined clamping grooves, hole positions and the like on the support or backrest, cooperates with these preset positions by means of a locking device such as a latch, and realizes the fixation of the backrest at a specific angle.

[0003] However, the multiple-gear adjustment mode has many obvious disadvantages. On the one hand, the limited number of gears makes the user only be able to choose from a few predetermined angles, and it is difficult to accurately adjust the chair back to the most suitable slope according to the individual unique physical conditions, sitting habits and real-time comfort needs. This results in different users being difficult to find the best angle that completely fits their body curves when using the seat, greatly limiting the universality and comfort of the seat.

[0004] With the continuous improvement of people's requirements for the comfort of the seat, the chair back mechanism capable of realizing linear stepless adjustment gradually becomes an urgent demand of the market. The present application proposes a handle-controlled stepless adjustment chair, which aims to conveniently control the locking and unlocking actions through the handle assembly, realize the stepless adjustment of the chair back, effectively solve the deficiencies of the traditional multiple-gear adjustment mode, bring the user a more flexible, accurate and comfortable chair back adjustment experience, and improve the overall performance of the seat and the user satisfaction. SUMMARY

[0005] The utility model provides a handle control's stepless adjustment chair back in view of the deficiency in the background art.

[0006] The utility model adopts the technical scheme that a handle control's stepless adjustment chair back, including support and backrest, the one end of support and the one end of backrest are between rotation cooperation, support and backrest are provided with stepless adjustment mechanism and handle assembly for controlling stepless adjustment mechanism between, stepless adjustment mechanism includes sleeve, telescopic piece, lock tongue, rack and pinion,

[0007] The sleeve one end is with backrest rotation cooperation, and the other end is provided with sleeve hole,

[0008] Telescopic piece one end and support rotation cooperation, the other end is provided with telescopic cooperation telescopic part of above-mentioned sleeve hole, and the middle part of telescopic part is provided with installation cavity,

[0009] The rack is arranged in the installation cavity and is fixedly connected with the sleeve,

[0010] The gear is rotatably connected to both sides of the mounting cavity, and the gear and the rack are engaged with each other.

[0011] The lock tongue is slidably arranged in the mounting cavity.

[0012] The handle assembly is connected with the lock tongue and is used for driving the lock tongue to move close to or away from the gear, when the lock tongue moves close to the gear and the head of the lock tongue is clamped into the gear teeth, the locking action is completed, and when the lock tongue moves away from the gear and is separated from the gear, the unlocking action is completed.

[0013] Further, the handle assembly comprises a driving shaft, a pushing block, a pushing torsional spring and a switch blocking ring, the driving shaft is rotatably connected with the telescopic piece, the pushing block is fixed on the driving shaft, the pushing block is provided with a gear boss I, the switch blocking ring has an elastic ring structure and is provided with a gear boss II, the pushing torsional spring is fixed on the pushing block, and one end of the pushing torsional spring is connected with a torsional spring step hole on the pushing block, and the other end is connected with a lock tongue hole on the lock tongue.

[0014] Further, the telescopic piece is provided with a communication hole communicated with the mounting cavity, the lock tongue has a handle portion inserted into the communication hole, and the lock tongue hole is arranged on the handle portion.

[0015] Further, the telescopic piece is provided with a rotating shaft step, the rotating shaft step is provided with a shaft hole, a rotating sleeve is rotatably connected in the shaft hole, and the driving shaft is connected with the rotating sleeve.

[0016] Further, the driving shaft is in an equilateral hexagonal structure, and the rotating sleeve and the pushing block are provided with hexagonal holes matched with the driving shaft.

[0017] Further, the two ends of the driving shaft are connected with driving handles.

[0018] Further, the lock tongue spring is connected with the bottom wall of the mounting cavity at one end and connected with a spring hole on the lock tongue at the other end.

[0019] Further, the long bolt and the damping spring are arranged, the sleeve and the telescopic piece are provided with connecting holes connected with the long bolt, the damping spring is sleeved on the long bolt, and the two ends of the damping spring are abutted against spring damping steps on the connecting holes.

[0020] Further, the sleeve is provided with hole columns on the two sides, the connecting holes are arranged on the hole columns, and a plurality of protruding teeth are arranged on the end hole walls of the connecting holes.

[0021] The utility model discloses the beneficial effect is:

[0022] Firstly, in terms of adjustment convenience, the handle assembly provides an intuitive and easy-to-operate control mode for the user. Compared with the traditional multi-gear adjustment which requires cumbersome plug-in or finding the appropriate slot, the user only needs to simply operate the handle to easily drive the lock tongue to achieve unlocking and locking, and then smoothly adjust the chair back angle, greatly simplifying the adjustment process.

[0023] Secondly, from the perspective of adjustment accuracy, the stepless adjustment mechanism breaks free from the shackles of fixed gears. The user can adjust the angle within the adjustment range of the chair back in a nearly linear manner to achieve precise control of the chair back slope.

[0024] In addition, in terms of comfort improvement, linear stepless adjustment combined with handle operation allows the user to continuously and smoothly change the chair back angle, gradually finding the position that best fits their body curve and maximally relieves back pressure and fatigue. In the process of long-term use of the seat, the user can also adjust the chair back at any time through the handle to adapt to changes in body state, effectively preventing physical discomfort caused by improper posture and creating a more comfortable and healthy use experience for the user.

[0025] In addition to the purposes, features and advantages described above, the present application has other purposes, features and advantages. The present application will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the present application.

[0027] Figure 2 It is a structural schematic diagram of the handle assembly of the control stepless adjustment mechanism.

[0028] Figure 3 It is Figure 2 A sectional view of B-B.

[0029] Figure 4 It is Figure 2 A sectional view of A-A.

[0030] Figure 5 It is a partial exploded schematic diagram of the handle assembly of the control stepless adjustment mechanism.

[0031] Figure 6 It is an exploded schematic diagram of the handle assembly of the control stepless adjustment mechanism with the sleeve hidden.

[0032] Figure 7 It is a structural schematic diagram of the sleeve.

[0033] Figure 8 It is a switch stop ring of the actuating block.

[0034] Figure 9The switch blocking ring is a switch blocking ring. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.

[0036] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings). If the specific posture changes, the directional indications also change accordingly.

[0037] The utility model provides a handle control's endless adjusting chair back.

[0038] In the embodiment, with reference to Figures 1-9 The handle control's endless adjusting chair back, including support 1 and backrest 2, the one end of support and the one end of backrest are between the rotary cooperation, be provided with endless adjusting mechanism and handle assembly 3 for controlling endless adjusting mechanism between support and backrest, endless adjusting mechanism includes sleeve 4, telescopic piece 5, lock tongue 6, rack 7 and gear 8;

[0039] One end of sleeve and backrest are rotary cooperation, and the other end is provided with sleeve hole 9;

[0040] One end of telescopic piece 5 and support are rotary cooperation, and the other end is provided with telescopic part 10 of telescopic cooperation with above-mentioned sleeve hole, and the middle part of telescopic part 10 is provided with installation cavity 11;

[0041] Rack is arranged in installation cavity 11 and is fixedly connected with sleeve;

[0042] Gear and installation cavity both sides are rotary connection, and gear and rack are intermeshed;

[0043] Lock tongue is slidably arranged in installation cavity;

[0044] Handle assembly is connected with lock tongue, for driving lock tongue to move close to or away from gear, when lock tongue moves close to gear and makes lock tongue head to be clamped into the tooth of gear, completes locking action, when lock tongue moves away from gear and is separated from gear, completes unlocking action.

[0045] In actual production, the rotating fit of the present application can be realized by using the conventional rotating fit of shaft and hole, so that the two components can rotate relative to each other, such as the rotating fit between the support and the backrest, the rotating fit between the telescopic member and the support, etc.

[0046] The sleeve hole at the other end of the sleeve is in clearance fit with the telescopic part on the telescopic member, so that the telescopic part can smoothly extend and retract in the sleeve hole. The rack is firmly installed in the installation cavity in the middle of the telescopic member and is fixedly connected with the sleeve, which can be fixed by welding, bolt connection, limiting structure, etc. The gear is connected with the two sides of the installation cavity through bearings, rotating shafts and other rotating connecting members, so as to ensure that the gear can rotate flexibly and be accurately meshed with the rack. The handle assembly is used to drive the lock tongue to move close to or away from the gear, which is convenient for users to operate.

[0047] When in use, the lock tongue is moved away from the gear by operating the handle assembly, so as to complete unlocking. At this time, the gear moves relative to the rack, so as to adjust the included angle between the support and the backrest. After adjusting to the appropriate angle, the lock tongue is moved close to the gear again by operating the handle assembly, so that the head part of the lock tongue is clamped into the teeth of the gear, the lock tongue is clamped into the gap between the teeth of the gear, the gear is clamped, and the locking is completed. At this time, the support and the backrest cannot rotate relative to each other.

[0048] The above endless adjustment mechanism cooperates with the handle assembly, so that the user can adjust the angle of the backrest at any time without being limited by fixed gears. The cooperation of the sleeve and the telescopic member and the meshing of the rack and the gear ensure the stability and accuracy of the adjustment process, and provide the user with a flexible and reliable adjustment experience.

[0049] Specifically, the handle assembly includes a driving shaft 12, a shifting block 13, a shifting torsional spring 14 and a switch blocking ring 15. The driving shaft is rotatably connected with the telescopic member. The shifting block is fixed on the driving shaft and is provided with a gear position boss 16. The switch blocking ring has a resilient annular structure and is provided with a gear position boss 17. The shifting torsional spring is fixed on the shifting block and is connected with a torsional spring step hole 18 on the shifting block at one end and with a lock tongue hole 19 on the lock tongue at the other end.

[0050] In the embodiment, the driving shaft is rotatably connected with the telescopic member to ensure smooth rotation. The shifting block is firmly fixed on the driving shaft by key connection or interference fit, etc. to ensure synchronous rotation. The gear position boss one is machined on the shifting block. The switch blocking ring is made of a metal or plastic material with elasticity and has an annular structure and a gear position boss two. One end of the shifting torsional spring is tightly inserted into the torsional spring step hole on the shifting block, and the other end is connected with the lock tongue hole on the lock tongue, which also ensures firm connection.

[0051] After the above is pressed, when the user rotates the driving shaft, the driving block rotates, and through the cooperation of the gear boss one and the gear boss two of the switch ring, when rotating, the locking tongue is raised or lowered by the driving spring, and the positioning of the upper and lower positions is realized, that is, the locking and unlocking states are realized.

[0052] Specifically, the telescopic part is provided with a communication hole 20 communicating with the installation cavity, and the locking tongue has a handle 21 extending into the communication hole.

[0053] In this embodiment, the communication hole communicating with the installation cavity is made on the telescopic part by drilling, milling or other machining processes. The locking tongue is designed with a handle extending into the communication hole, and a locking hole is machined on the handle to connect with the driving spring.

[0054] The arrangement of the communication hole and the handle of the locking tongue provides a reasonable structural layout for the installation and operation of the locking tongue, allowing smooth sliding of the locking tongue in the installation cavity and facilitating connection with the handle assembly, ensuring the continuity and reliability of the operation of the entire adjusting mechanism.

[0055] Specifically, the telescopic part is provided with a rotating shaft step 22, the rotating shaft step 22 is provided with a shaft hole 23, the shaft hole is rotatably connected with a rotating sleeve 24, and the driving shaft is connected with the rotating sleeve 24.

[0056] In this embodiment, the rotating shaft step is made on the telescopic part by machining, and the shaft hole is drilled on the rotating shaft step. A rotating sleeve of appropriate size is selected, installed in the shaft hole and ensured to rotate flexibly relative to the shaft hole.

[0057] Specifically, the driving shaft is in an equilateral hexagonal structure, and the rotating sleeve and the driving block are both provided with a hexagonal hole 25 adapted for connection with the driving shaft.

[0058] In this embodiment, the cooperation of the equilateral hexagonal driving shaft and the hexagonal hole ensures accurate and reliable torque transmission between the driving shaft and the rotating sleeve and the driving block, prevents slipping during adjustment, and improves the accuracy and stability of the handle assembly control.

[0059] Specifically, the driving shaft is connected with a driving handle 26 at both ends.

[0060] In this embodiment, the driving handles are arranged at both ends of the driving shaft, providing a more convenient operation mode for the user. The user can choose to operate the handle from the left or right side of the seat according to their own habits, improving the convenience and comfort of use.

[0061] Specifically, it also includes a locking spring 27, one end of which is connected with the bottom wall of the installation cavity, and the other end is connected with a spring hole 28 on the locking tongue.

[0062] In the embodiment, the lock tongue spring provides additional reset force for the lock tongue, and when the handle assembly releases the control of the lock tongue, the lock tongue can be quickly reset under the action of the lock tongue spring, and the lock tongue is engaged with the gear to achieve locking, thereby improving the response speed and reliability of the adjusting mechanism.

[0063] Specifically, the sleeve and the telescopic part are provided with connecting holes 31 for connecting the long bolt, and the shock-absorbing spring is sleeved on the long bolt, and the two ends of the shock-absorbing spring abut against the spring shock-absorbing steps 32 on the connecting holes.

[0064] In the embodiment, the connecting holes are manufactured on the two sides of the sleeve and the telescopic part by drilling or other processing methods, and the coaxiality of the connecting holes on the two sides is ensured. The long bolt of a proper specification is selected and passes through the connecting holes on the two sides of the sleeve and the telescopic part. The shock-absorbing spring is sleeved on the long bolt, and the two ends of the shock-absorbing spring abut against the spring shock-absorbing steps in the connecting holes. The pre-tightening force of the shock-absorbing spring can be controlled by adjusting the nut of the long bolt.

[0065] The long bolt and the shock-absorbing spring enhance the stability of the connection between the sleeve and the telescopic part. The shock-absorbing spring can buffer the impact force generated in the adjusting process, reduce the wear between the components, and reduce the noise. In the non-locking state, the shock-absorbing spring can realize automatic elastic adjustment and realize the function of automatic forward and backward swinging.

[0066] Specifically, the two sides of the sleeve have hole columns 33, the connecting holes 34 are arranged on the hole columns 33, and a plurality of protrusions are arranged in the hole wall at the end of the connecting holes.

[0067] In the embodiment, the hole columns are manufactured on the two sides of the sleeve by machining, and the connecting holes are drilled on the hole columns. A plurality of protrusions are manufactured in the hole wall at the end of the connecting holes by special processing technology (such as knurling). When the long bolt is installed, the protrusions generate a certain friction force with the surface of the long bolt, thereby enhancing the firmness of the connection.

[0068] The arrangement of the protrusions at the end of the connecting holes on the hole columns further improves the reliability of the connection between the sleeve and the long bolt. The friction force between the protrusions and the long bolt can effectively prevent the long bolt from loosening during use, ensure the structural stability of the entire adjusting mechanism during long-term use, and improve the safety and reliability of the seat.

[0069] Note for all technical personnel: Although the utility model has been described according to the above specific embodiments, the utility model idea is not limited to the utility model, and any modification using the utility model idea will be included in the patent protection range.

Claims

1. A handle controlled infinitely adjustable chair back comprising a bracket and a backrest, the bracket being rotatably coupled between one end of the backrest, characterised in that: The support and the backrest are provided with a stepless adjusting mechanism and a handle assembly for controlling the stepless adjusting mechanism, the stepless adjusting mechanism comprises a sleeve, an extension piece, a lock tongue, a rack and a gear; One end of the sleeve is rotationally connected with the backrest, and the other end is provided with a sleeve hole; One end of the extension piece is rotationally connected with the support, and the other end is provided with an extension part which is telescopically connected with the sleeve hole; The rack is arranged in the mounting cavity and fixedly connected with the sleeve; The gear is rotationally connected with both sides of the mounting cavity, and the gear and the rack are intermeshed; The lock tongue is slidingly arranged in the mounting cavity; The handle assembly is connected with the lock tongue and used for driving the lock tongue to move close to or away from the gear, when the lock tongue moves close to the gear and the head of the lock tongue is clamped into the gear teeth, the locking action is completed, and when the lock tongue moves away from the gear and is separated from the gear, the unlocking action is completed.

2. A handle controlled endless adjustment chair back according to claim 1 characterised in that: The handle assembly comprises a driving shaft, a shifting block, a shifting torsional spring and a switch blocking ring, the driving shaft is rotationally connected with the extension piece, the shifting block is fixed on the driving shaft, the shifting block is provided with a gear position boss one, the switch blocking ring has an elastic ring structure and is provided with a gear position boss two, the shifting torsional spring is fixed on the shifting block, one end of the shifting torsional spring is connected with a torsional spring step hole on the shifting block, and the other end is connected with a lock tongue hole on the lock tongue.

3. A handle controlled endless adjustment chair back according to claim 2, characterised in that: The extension piece is provided with a communication hole which is in communication with the mounting cavity, the lock tongue has a handle part which extends into the communication hole, and the lock tongue hole is arranged on the handle part.

4. A handle-controlled infinitely adjustable chair back according to claim 2, characterized in that: The extension piece is provided with a rotating shaft step, the rotating shaft step is provided with a shaft hole, a rotating sleeve is rotationally connected in the shaft hole, and the driving shaft is connected with the rotating sleeve.

5. A handle controlled endless adjustment chair back according to claim 4, characterised in that: The driving shaft is in the shape of an equilateral hexagon, and the rotating sleeve and the shifting block are both provided with a hexagonal hole which is adapted to be connected with the driving shaft.

6. A handle controlled endless adjustment chair back according to claim 5, characterised in that: Both ends of the driving shaft are connected with driving handles.

7. A handle-controlled infinitely adjustable chair back according to claim 1, characterized in that: A lock tongue spring is further arranged, one end of the lock tongue spring is connected with a bottom wall of the mounting cavity, and the other end is connected with a spring hole on the lock tongue.

8. A handle-controlled infinitely adjustable chair back according to claim 7, characterized in that: A long bolt and a damping spring are further arranged, both sides of the sleeve and the extension piece are provided with connecting holes which are adapted to be connected with the long bolt, the damping spring is sleeved on the long bolt, and both ends of the damping spring are abutted against spring damping steps on the connecting holes.

9. A handle-controlled endless-adjust chair back according to claim 8, characterized in that: Both sides of the sleeve are provided with hole columns, the connecting holes are arranged on the hole columns, and a plurality of protruding teeth are arranged in end hole walls of the connecting holes.

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