Semi-automatic adjusting device for vehicle seat armrest

Abstract

The present invention discloses a semi-automatic adjusting device for a vehicle seat armrest, which comprises an armrest inner frame, a stepless adjusting mechanism, a mounting base frame and a force-bearing fixing component. The rear end of the armrest inner frame is pivotally connected to the force-bearing fixing component, and the stepless adjusting mechanism is fixed in the armrest inner frame. The stepless adjusting mechanism comprises an adjusting base frame and an adjusting top piece. One side of the adjusting base frame is provided with a top piece sliding groove and more than one one-way locking groove. The adjusting top piece is movably arranged in the top piece sliding groove. The height of the rear end of the one-way locking groove is higher than that of the front end, presenting a shape that is smaller at the front and larger at the rear. A one-way locking piece is movably arranged in the one-way locking groove; the lower side of the one-way locking piece contacts the upper side of the adjusting top piece; a self-locking spring is arranged between the rear end of the one-way locking groove and the rear end of the one-way locking piece. The force-bearing fixing component comprises a fixed sleeve shaft and a blocking piece. The advantages of the present invention are as follows: the structure is simple and reasonable, the manufacturing and installation are convenient, and there is no noise; the relative angle can be adjusted steplessly, and it can also be completely folded up; it has better practicability.

Description

Technical Field

[0001] The present invention relates to a seat armrest, and in particular to an adjustment of the angle of a vehicle seat armrest, a semi-automatic adjustment device that can withstand large pressures, is stepless, noiseless, has a simple structure and stable functions. Background Art

[0002] With the development of the automobile manufacturing industry, the technical requirements for the field of automobile parts have also rapidly increased. Seat armrests are also essential, and the adjustment of the height of the armrest is important for comfort.

[0003] In the existing adjustment technology of seat armrests, generally, the friction generated when a snap ring holds a rotating shaft is used to position the armrest. Although this technology is simple, there will be a situation where the snap ring cannot hold tightly and fails after wear; there is also a technical solution of ratchet adjustment, but noise will be generated during adjustment.

[0004] For example, the armrest assembly for a motor vehicle seat disclosed in the application publication number CN108778830A and the armrest device for a motor vehicle disclosed in the application publication number CN110626238A both adopt similar technical solutions. They use the cooperation between the adjusting element based on the rotation and telescopic principle of a screw rod and the bracket structure to implement the adjustment of the armrest. Although this technical solution can make the armrest have a greater bearing capacity and can also achieve stepless adjustment, the stability of the screw rod during compression is insufficient and the structure is too complex, which will increase the incidence of failures.

[0005] In view of this, the present invention application attempts to develop a semi-automatic adjustment device for a vehicle seat armrest that is simple and convenient in structure, manufacturing, and installation, has a large bearing capacity, is safe to use, and can achieve stepless adjustment and noiseless operation. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a semi-automatic adjustment device for a vehicle seat armrest that can withstand large pressures, has a simple structure, stable functions, stepless adjustment, and noiseless operation.

[0007] A semi-automatic adjustment device for a vehicle seat armrest includes an armrest inner frame, a stepless adjustment mechanism, an installation base frame, and a force-bearing fixing component. The rear end of the armrest inner frame is pivotally connected to the force-bearing fixing component. The stepless adjustment mechanism is fixedly installed in the armrest inner frame. It is characterized in that the stepless adjustment mechanism includes an adjustment base frame and an adjustment top piece. A top piece sliding groove and more than one one-way locking groove are provided on one side of the adjustment base frame. The adjustment top piece is movably arranged in the top piece sliding groove. The height of the rear end of the one-way locking groove is higher than that of the front end, forming a shape that is smaller in the front and larger in the rear. A one-way locking piece is movably arranged in the one-way locking groove. The front-rear length of the one-way locking piece is smaller than the front-rear length of the one-way locking groove;

[0008] The lower side of the one-way locking member contacts the upper side of the adjusting top member;

[0009] A self-locking spring hole is provided at the rear end of the one-way locking groove. A self-locking spring is arranged between the rear end of the one-way locking member and the self-locking spring hole. The self-locking spring always pops the one-way locking member forward, so that the one-way locking member is stuck between the upper side of the adjusting top member and the upper side of the one-way locking groove, making the adjusting top member unable to retract forward;

[0010] The force-bearing fixing assembly includes a fixed sleeve shaft and a blocking member fixed to the lower side of the fixed sleeve shaft. The rear end of the adjusting top member abuts against the front side of the blocking member.

[0011] A further preferred solution of the present invention is that: an extension spring hole is provided at the front end of the adjusting top member. An extension spring mounting member is provided on the front side of the top member sliding groove. An adjusting extension spring is arranged between the extension spring mounting member and the extension spring hole. The extension force of the adjusting extension spring is greater than the extension force of the self-locking spring. Without the action of external force, the adjusting top member can push open the forward locking of the one-way locking member under the action of the adjusting extension spring and freely extend backward.

[0012] A further preferred solution of the present invention is that: a lower side limit strip is provided on the outer side of the top member sliding groove, and a distance limit groove is provided on the upper side of the lower side limit strip;

[0013] A distance limit pin is fixedly arranged at the position corresponding to the same side of the adjusting top member and the distance limit groove. The adjusting top member can move back and forth within the distance of the distance limit groove.

[0014] A further preferred solution of the present invention is that: a locking connection strip is fixedly arranged on the outer sides of the two one-way locking members, and a one-way unlocking buckle is fixedly arranged on the inner side of the rear of the locking connection strip;

[0015] A locking sliding groove is provided on the adjusting base frame corresponding to the one-way unlocking buckle. An unlocking fixed buckle is provided at the rear end of the locking sliding groove. The rear side of the one-way unlocking buckle and the front side of the unlocking fixed buckle are inclined planes;

[0016] An upper side limiting member is fixed on the outer side of the one-way locking groove on one side of the adjusting base frame.

[0017] A further preferred scheme of the present invention is: an unlocking push piece is fixedly provided on the front outer side of the adjusting top piece, and the distance between the unlocking push piece and the front end of the locking connecting strip is smaller than the distance between the distance limiting pin and the rear end of the distance limiting groove. Under the action of the adjusting extension spring, the adjusting top piece links the unlocking push piece to move backward a relative distance, thereby contacting and continuing to push the locking connecting strip and the one-way locking piece to move backward, so that the one-way unlocking buckle provided in the locking connecting strip is buckled on the rear side of the unlocking fixing buckle, so that the one-way locking piece unlocks the adjusting top piece. At this time, the adjusting top piece can freely retract forward under the action of external force.

[0018] A further preferred scheme of the present invention is: an unlocking piece is fixedly provided on one side of the blocking piece at a position corresponding to the rear end of the locking connecting strip, and the front outer side of the unlocking piece is an inclined surface. During the downward adjustment process of the front end of the stepless adjustment mechanism, the rear end of the locking connecting strip is pushed outward under the action of the inclined surface of the unlocking piece, so that the one-way unlocking buckle is separated from the restriction of the unlocking fixing buckle. Under the action of the self-locking spring and the inclined surface, the one-way locking piece and the locking connecting strip move forward to restore the one-way locking effect on the adjusting top piece.

[0019] A further preferred solution of the present invention is: a damping mounting piece is fixedly provided on the outer side of the lower limit strip, a damper is provided on the damping mounting piece, and a damping rack is provided at a position of the adjusting top piece corresponding to the damper and meshed with each other.

[0020] A further preferred embodiment of the present invention is: a manual switch is movably provided on the front lower side of the armrest inner frame, a second locking connecting strip is fixedly provided on the outer sides of the two one-way locking members, and a switch connecting rod is movably connected between the upper side of the manual switch and the front end of the second locking connecting strip.

[0021] A further preferred solution of the present invention is: the armrest inner frame comprises connecting pieces on left and right sides and inner frame connecting strips for fixing the connecting pieces on both sides, and the rear ends of the connecting pieces on the left and right sides are provided with shaft connection holes that match the fixing sleeve shaft;

[0022] A sleeve shaft limiting member is arranged on the fixed sleeve shaft, and a friction member is arranged between the sleeve shaft limiting member and the connecting member;

[0023] An armrest cover frame is provided on the outer cover of the armrest inner frame, and a movable hole for fixing a sleeve shaft is provided on one side of the armrest cover frame.

[0024] A further preferred solution of the present invention is as follows: The installation base frame includes a fixed square shaft. The installation base frame is fixedly installed on one side of the seat back. An installation fixing hole that matches the fixed square shaft is provided in the fixed sleeve shaft, and the fixed sleeve shaft is sleeved on the fixed square shaft.

[0025] The present invention designs two different technical solutions, and its advantages are as follows: The structure is simple, reasonable, easy to manufacture and install, and there is no noise; it can be steplessly adjusted within a relative angle and can also be completely folded up; when the armrest is adjusted downward, it can be adjusted at any time with a manual switch, or it can be pulled up to a relative angle and then automatically unlocked, and adjusted from bottom to top; it has better practicability. Brief Description of the Drawings

[0026] Figure 1 It is a sectional perspective structure diagram of one side of the armrest of the present invention;

[0027] Figure 2 It is a sectional perspective adjustment diagram of the armrest of the present invention;

[0028] Figure 3 It is a sectional perspective diagram of the armrest of the present invention being folded up upward;

[0029] Figure 4 It is a sectional perspective exploded diagram of the present invention;

[0030] Figure 5 It is a partial perspective structure diagram of the present invention when the front end of the armrest is adjusted to the lowest position;

[0031] Figure 6 It is a partial perspective exploded diagram of the present invention;

[0032] Figure 7 It is an exploded perspective diagram of the stepless adjustment mechanism of the present invention;

[0033] Figure 8 It is a side top-down perspective diagram of the unlocking process of the unlocking part when the stepless adjustment mechanism of the present invention is lowered;

[0034] Figure 9 It is a top-down perspective structure diagram of the present invention;

[0035] Figure 10 It is an exploded perspective diagram of the armrest and the installation base frame of the present invention and a 90-degree rotation perspective diagram of the two;

[0036] Figure 11 It is a schematic diagram of the present invention;

[0037] Figure 12 It is a schematic diagram of the armrest of the present invention being folded up upward;

[0038] Figure 13 It is a partial perspective structure diagram of the present invention;

[0039] Figure 14 Stereogram of the cross-section of the stepless adjustment mechanism of the present invention;

[0040] Figure 15 Stereogram of the manual switch of the side cross-section of the armrest of the present invention;

[0041] Figure 16 Exploded stereogram of the manual switch of the present invention. Specific embodiments

[0042] The present invention will be further described in detail below in conjunction with the embodiments of the drawings. However, those skilled in the art will appreciate that these drawings are only drawn for the purpose of explaining the preferred embodiments and should not be construed as limiting the scope of the present invention. In addition, the drawings are only intended to conceptually represent the composition or structure of the described object, and may include exaggerated displays, and the drawings are not necessarily drawn to scale. These descriptions are only descriptive and exemplary and should not be construed as limiting the scope of protection of the present invention.

[0043] It should also be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "inner", "outer", "left", "right", clockwise, counterclockwise, etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

[0044] As shown in the figure: A is the front end, B is the rear end, C is the horizontal line, E is the upper, and F is the lower;

[0045] 1. Inner frame of the armrest, 2. Stepless adjustment mechanism, 4. Installation base frame, 5. Armrest glove frame, 6. Manual switch, 7. Switch connecting rod;

[0046] 11. Inner frame connecting strip, 12. Adjustment base frame, 13. Top part sliding groove, 14. One-way locking groove, 15. Self-locking spring hole, 16. Extension spring hole, 17. Extension spring installation part, 18. Adjustment extension spring, 19. Self-locking spring;

[0047] 21. Adjustment top part, 22. One-way locking part, 23. Locking sliding groove, 25. Unlock fixing buckle (fixed at the rear end of the locking part sliding groove), 26. Locking connecting strip, 27. One-way unlocking buckle (fixed at the lower rear side of the locking connecting strip 26), 28. Upper side limiting strip, 261. Second locking connecting strip;

[0048] 31. Lower side limiting strip, 32. Distance limiting groove, 33. Distance limiting pin, 35. Unlock pushing part, 36. Damping rack, 37. Damper, 38. Damper installation part;

[0049] 41. Fixed sleeve shaft, 42. Blocking member, 43. Unlocking member, 44. Axial connection hole, 45. Mounting and fixing hole, 46. Sleeve shaft limiting member, 47. Friction member, 48. Mounting and fixing square shaft.

[0050] As Figures 1 to 9 As shown in Figures 14: A semi-automatic adjustment device for a vehicle seat armrest, including an armrest inner frame 1, a stepless adjustment mechanism 2, a mounting base frame 4, and a force-bearing fixing assembly. The rear end of the armrest inner frame 1 is axially connected to the force-bearing fixing assembly. The stepless adjustment mechanism 2 is fixedly installed in the armrest inner frame 1. The stepless adjustment mechanism 2 includes an adjustment base frame 12 and an adjustment top member 21. One side of the adjustment base frame 12 is provided with a top member sliding groove 13 and more than one one-way locking groove 14. The adjustment top member 21 is movably arranged in the top member sliding groove 13. The height of the rear end of the one-way locking groove 14 is higher than that of the front end, showing a shape with a smaller front and a larger rear. A one-way locking member 22 is movably arranged in the one-way locking groove 14. The front and rear length of the one-way locking member 22 is less than the front and rear length of the one-way locking groove 14;

[0051] The lower side of the one-way locking member 22 contacts the upper side of the adjustment top member 21;

[0052] A self-locking spring hole 15 is provided at the rear end of the one-way locking groove 14. A self-locking spring 19 is arranged between the rear end of the one-way locking member 22 and the self-locking spring hole 15. The self-locking spring 19 always pops the one-way locking member 22 forward, so that the one-way locking member 22 is stuck between the upper side of the adjustment top member 21 and the upper side of the one-way locking groove 14, making the adjustment top member 21 unable to retract forward;

[0053] The force-bearing fixing assembly includes a fixed sleeve shaft 41 and a blocking member 42 fixed to the lower side of the fixed sleeve shaft 41. The rear end of the adjustment top member 21 abuts against the front side of the blocking member 42.

[0054] An extension spring hole 16 is provided at the front end of the adjustment top member 21. An extension spring mounting member 17 is provided on the front side of the top member sliding groove 13. An adjustment extension spring 18 is arranged between the extension spring mounting member 17 and the extension spring hole 16. The extension force of the adjustment extension spring 18 is greater than the extension force of the self-locking spring 19. Without the action of an external force, under the action of the adjustment extension spring 18, the adjustment top member 21 can push open the forward locking of the one-way locking member 22 and freely extend backward.

[0055] A lower side limiting strip 31 is provided on the outside of the top member sliding groove 13. A distance limiting groove 32 is provided on the upper side of the lower side limiting strip 31;

[0056] A distance limiting pin 33 is fixedly arranged at the position corresponding to the same side of the adjustment top member 21 as the distance limiting groove 32. The adjustment top member 21 can move back and forth within the distance of the distance limiting groove 32.

[0057] The distance that the adjusting top piece 21 extends backward under the restriction of the distance limiting groove 32 should be greater than or equal to the distance between the unlocking push piece 35 and the front end of the locking piece connecting bar 26 plus the distance that the one-way unlocking buckle 27 is buckled on the rear side of the unlocking fixing buckle 25, that is: when the armrest is folded upward, the rear end of the adjusting top piece 21 is separated from the blocking piece 42. At this time, under the action of the adjusting extension spring 18, the adjusting top piece 21 and the unlocking push piece 35 gradually move backward, and then push the locking connecting bar 26 backward until the one-way unlocking buckle 27 on the rear side of the locking piece connecting bar 26 is buckled on the rear side of the unlocking fixing buckle 25; and at this time, the one-way locking piece 22 is in an unlocked state for the adjusting top piece 21, as Figure 8 shown.

[0058] There is a locking connecting bar 26 fixedly arranged on the outer sides of the two one-way locking pieces 22, and a one-way unlocking buckle 27 is fixedly arranged on the rear inner side of the locking connecting bar 26;

[0059] There is a locking sliding groove 23 arranged on the adjusting base frame 12 corresponding to the one-way unlocking buckle 27. There is an unlocking fixing buckle 25 arranged at the rear end of the locking sliding groove 23. The rear side of the one-way unlocking buckle 27 and the front side of the unlocking fixing buckle 25 are inclined planes;

[0060] There is an upper side limiting piece 28 fixedly arranged on the outer side of the one-way locking groove 14 on one side of the adjusting base frame 12. The upper side limiting piece 28 can limit the one-way locking piece 22 from moving outward.

[0061] There is an unlocking push piece 35 fixedly arranged on the front outer side of the adjusting top piece 21. The distance between the unlocking push piece 35 and the front end of the locking connecting bar 26 is less than the distance between the distance limiting pin 33 and the rear end of the distance limiting groove 32. Under the action of the adjusting extension spring 18, when the adjusting top piece 21 drives the unlocking push piece 35 to move backward relative to the distance, it touches and continues to push the locking connecting bar 26 and the one-way locking piece 22 backward, so that the one-way unlocking buckle 27 arranged in the locking connecting bar 26 is buckled on the rear side of the unlocking fixing buckle 25, and the one-way locking piece 22 unlocks the adjusting top piece 21. At this time, the adjusting top piece 21 can freely retract forward under the action of an external force.

[0062] As Figures 1 to 5 shown in FIGS. 8 and 13: There is an unlocking piece 43 fixedly arranged at the position corresponding to the rear end of the locking connecting bar 26 on one side of the blocking piece 42. The front outer side of the unlocking piece 43 is an inclined plane. During the downward adjustment process of the front end of the stepless adjustment mechanism 2, when the rear end of the locking connecting bar 26 touches the inclined plane of the unlocking piece 43, it is pushed outward under the action of the inclined plane, so that the one-way unlocking buckle 27 is separated from the restriction of the unlocking fixing buckle 25. Under the action of the self-locking spring 19 and the inclined plane, the one-way locking piece 22 and the locking connecting bar 26 move forward to restore the one-way locking effect on the adjusting top piece 21.

[0063] The top piece sliding groove 13 and the one-way locking groove 14 are vertically connected. After installing the upper adjusting top piece 21 in the top piece sliding groove 13, the lower side of the one-way locking piece 22 contacts the upper side of the adjusting top piece 21. The one-way locking piece 22 has a front end height less than the rear end height and fits with the middle section of the one-way locking groove 14, forming a plug shape. The one-way locking piece 22 is installed in the one-way locking groove 14 with relative spaces left at both the front and rear ends. When the one-way locking piece 22 moves forward under the action of the self-locking spring 19, it can brake and lock the adjusting top piece 21 from retracting forward; that is, the armrest can only be adjusted upward and cannot be rotated downward.

[0064] The extension force of the self-locking spring 19 can be very small, while the extension force of the adjusting extension spring 18 can be relatively large. Since the inner frame 1 of the armrest is connected to the fixed sleeve shaft 41, there is relative friction between them, that is, relative pulling force or pressure is required to adjust the armrest when turning it by hand; therefore: the extension force of the adjusting extension spring 18 only needs not to automatically lift the armrest.

[0065] The adjustment range of the armrest is generally within 20 degrees, and the extension distance of the adjusting top piece 21 only needs to be about 12 millimeters. When the armrest needs to be fully folded upward, the rear end of the adjusting top piece 21 leaves the blocking piece 42, as Figure 3 、 12 shown.

[0066] When the armrest is pulled upward beyond the relative angle, such as 20 degrees, the adjusting top piece 21 will leave the blocking piece 42. At this time, the one-way locking piece 22 has been unlocked, that is, the one-way unlocking buckle 27 in the locking connection bar 26 has been buckled behind the unlocking fixed buckle 25. When the armrest is pressed downward for adjustment, the adjusting top piece 21 retracts forward under the block of the blocking piece 42.

[0067] When the armrest is adjusted downward to the lowest position, the rear end of the locking connection bar 26 is pushed outward under the action of the inclined plane after contacting the inclined plane of the unlocking piece 43, so that the one-way unlocking buckle 27 is released from the restriction of the unlocking fixed buckle 25. Under the action of the self-locking spring 19 and the inclined plane, the one-way locking piece 22 and the locking connection bar 26 move forward, automatically restoring the one-way jamming effect on the adjusting top piece 21.

[0068] As Figure 6 、 7 、8、14 shown: A damping installation piece 38 is fixedly arranged on the outer side of the lower side limiting bar 31. A damper 37 is arranged on the damping installation piece 38. A damping rack 36 is arranged at the corresponding position of the adjusting top piece 21 and meshes with it.

[0069] The setting of the damper 37 can make the adjustment of the adjusting top piece 21 more smooth. The damper 37 is an existing technology and will not be elaborated too much in the present invention.

[0070] As Figure 15 、16 As shown in the figure: A manual switch 6 is movably arranged at the front lower side of the inner armrest frame 1. A second locking connection bar 261 is fixedly arranged on the outer sides of two one-way locking members 22. A switch connecting rod 7 is movably connected between the upper side of the manual switch 6 and the front end of the second locking connection bar 261.

[0071] The setting of the manual switch 6 enables manual control of the one-way locking of the adjusting top member 21 by the one-way locking member 22. The manual switch is L-shaped. That is, when the manual switch 6 is pressed upward by hand at the front lower side of the armrest, the rear upper side of the manual switch 6 pushes the locking connection bar 261 to move backward, and then drives the one-way locking member 22 to move backward to unlock the adjusting top member 21. As long as the manual switch 6 is pressed by hand, the armrest can be adjusted downward at any time. When the armrest is adjusted upward or pulled up, the manual switch 6 does not need to be pressed.

[0072] As Figure 1 、 2 As shown in Figures 4, 9, 11, and 12: The inner armrest frame 1 includes connecting members on the left and right sides and an inner frame connecting bar 11 for fixing the two connecting members. Axial connection holes 44 that match the fixed sleeve shaft 41 are provided at the rear ends of the connecting members on the left and right sides;

[0073] A sleeve shaft limiting member 46 is arranged on the fixed sleeve shaft 41, and a friction member 47 is arranged between the sleeve shaft limiting member 46 and the connecting member;

[0074] An armrest glove rack 5 is sleeved outside the inner armrest frame 1, and a fixed sleeve shaft moving hole is provided on one side of the armrest glove rack 5.

[0075] The force-bearing fixing assembly and the installation base frame 4 are fixedly sleeved. The inner armrest frame 1 is movably axially connected to the fixed sleeve shaft 41 through the axial connection holes 44 on the connecting members on the left and right sides. Therefore, the inner armrest frame 1 can adjust the height comfort of the armrest by the telescopic movement of the adjusting top member 21 in the stepless adjustment mechanism 2.

[0076] As Figures 9 to 12 As shown in the figure: The installation base frame 4 includes a fixed square shaft 48. The installation base frame 4 is fixedly installed on one side of the seat back. An installation fixing hole 45 that matches the fixed square shaft 48 is provided in the fixed sleeve shaft 41, and the fixed sleeve shaft 41 is sleeved on the fixed square shaft 48.

[0077] The setting of the friction member 47 enables the armrest to require relative manual pulling force or pressure when being adjusted up and down, which makes the armrest more stable during manual adjustment and no noise will be generated when the vehicle is driving.

[0078] The above detailed introduction to the present invention uses specific examples to elaborate on the principles and implementation manners of the present invention. The description of the above embodiments is only used to help understand the core idea of the present invention. For ordinary technicians in the technical field, without departing from the principles of the present invention, several improvements can still be made to the present invention, and these improvements also fall within the protection scope of the claims of the present invention.

Claims

1. A semi-automatic adjustment device for a vehicle seat armrest, comprising an armrest inner frame, a stepless adjustment mechanism, a mounting base frame and a force-bearing fixing assembly. The rear end of the armrest inner frame is pivotally connected to the force-bearing fixing assembly, and the stepless adjustment mechanism is fixedly installed in the armrest inner frame, characterized in that The stepless adjustment mechanism includes an adjustment base frame and an adjustment top piece. One side of the adjustment base frame is provided with a top piece sliding groove and more than one one-way locking groove. The adjustment top piece is movably arranged in the top piece sliding groove. The height of the rear end of the one-way locking groove is higher than that of the front end, presenting a shape that is smaller in the front and larger in the rear. A one-way locking piece is movably arranged in the one-way locking groove, and the front-back length of the one-way locking piece is smaller than the front-back length of the one-way locking groove; The lower side of the one-way locking piece contacts the upper side of the adjustment top piece; A self-locking spring hole is provided at the rear end of the one-way locking groove. A self-locking spring is arranged between the rear end of the one-way locking piece and the self-locking spring hole. The self-locking spring always pops the one-way locking piece forward, so that the one-way locking piece is stuck between the upper side of the adjustment top piece and the upper side of the one-way locking groove, making the adjustment top piece unable to retract forward; The force-bearing fixing assembly includes a fixed sleeve shaft and a blocking piece fixed to the lower side of the fixed sleeve shaft. The rear end of the adjustment top piece abuts against the front side of the blocking piece; A stretching spring hole is provided at the front end of the adjustment top piece. A stretching spring mounting piece is provided on the front side of the top piece sliding groove. An adjustment stretching spring is arranged between the stretching spring mounting piece and the stretching spring hole. The stretching force of the adjustment stretching spring is greater than the stretching force of the self-locking spring. Without the action of external force, under the action of the adjustment stretching spring, the adjustment top piece can push open the forward locking of the one-way locking piece and freely stretch backward; The inner armrest frame includes connecting pieces on the left and right sides and an inner frame connecting bar for fixing the two connecting pieces. Shaft connecting holes that match the fixed sleeve shaft are provided at the rear ends of the connecting pieces on the left and right sides; A sleeve shaft limiting piece is arranged on the fixed sleeve shaft. A friction piece is arranged between the sleeve shaft limiting piece and the connecting piece; An armrest glove frame is sleeved outside the inner armrest frame, and a fixed sleeve shaft moving hole is provided on one side of the armrest glove frame.

2. The semi-automatic adjusting device for a vehicle seat armrest according to claim 1, characterized in that A lower side limiting strip is provided outside the top piece sliding groove, and a distance limiting groove is provided on the upper side of the lower side limiting strip; A distance limiting pin is fixedly arranged at the position corresponding to the distance limiting groove on the same side of the adjustment top piece. The adjustment top piece can move back and forth within the distance of the distance limiting groove.

3. The semi-automatic adjusting device for a vehicle seat armrest according to claim 2, characterized in that Locking connection bars are fixedly arranged on the outer sides of the two one-way locking pieces, and a one-way unlocking buckle is fixedly arranged on the rear inner side of the locking connection bars; A locking sliding groove is provided on the adjustment base frame corresponding to the one-way unlocking buckle. An unlocking fixed buckle is provided at the rear end of the locking sliding groove. The rear side of the one-way unlocking buckle and the front side of the unlocking fixed buckle are inclined planes; An upper side limiting piece is fixed outside the one-way locking groove on one side of the adjustment base frame.

4. The semi-automatic adjusting device for a vehicle seat armrest according to claim 3, characterized in that An unlocking push member is fixedly arranged on the front outer side of the adjusting top member. The distance between the unlocking push member and the front end of the locking connection bar is less than the distance between the distance limit pin and the rear end of the distance limit groove. Under the action of the adjusting extension spring, when the adjusting top member drives the unlocking push member to move backward relative to the distance, it touches and continues to push the locking connection bar and the one-way locking member backward, so that the one-way unlocking buckle arranged in the locking connection bar is buckled behind the unlocking fixed buckle, and the one-way locking member unlocks the adjusting top member. At this time, the adjusting top member can freely retract forward under the action of an external force.

5. The semi-automatic adjustment device for a vehicle seat armrest according to claim 4, characterized in that An unlocking member is fixedly arranged at a position corresponding to the rear end of the locking connection bar on one side of the blocking member. The front outer side of the unlocking member is beveled. During the downward adjustment of the front end of the stepless adjustment mechanism, the rear end of the locking connection bar is pushed outwards under the action of the bevel of the unlocking member, so that the one-way unlocking buckle is released from the restriction of the unlocking fixed buckle. Under the action of the self-locking spring and the bevel, the one-way locking member and the locking connection bar move forward to restore the one-way locking effect on the adjusting top member.

6. The semi-automatic adjusting device for a vehicle seat armrest according to claim 2, characterized in that A damping mounting member is fixedly arranged on the outer side of the lower side limit bar. A damper is arranged on the damping mounting member. A damping rack is arranged at a position corresponding to the damper on the adjusting top member and is meshed with the damper.

7. The semi-automatic adjusting device for a vehicle seat armrest according to claim 1, wherein A manual switch is movably arranged at the front lower side of the inner frame of the armrest. A second locking connection bar is fixedly arranged on the outer sides of the two one-way locking members. A switch connecting rod is movably connected between the upper side of the manual switch and the front end of the second locking connection bar.

8. The semi-automatic adjustment device for a vehicle seat armrest according to claim 1, characterized in that The mounting base frame includes a fixed square shaft. The mounting base frame is fixedly installed on one side of the seat back. An installation fixing hole matching the fixed square shaft is arranged in the fixed sleeve shaft, and the fixed sleeve shaft is sleeved on the fixed square shaft.

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