CN210672706U

CN210672706U - Adjustable backrest linkage mechanism

Info

Publication number: CN210672706U
Application number: CN201921767207.6U
Authority: CN
Inventors: 刘文超; 李勇兵; 亓飞
Original assignee: Shanghai Bekrypton Ruobao Health Technology Co Ltd
Current assignee: Shanghai Bekrypton Ruobao Health Technology Co Ltd
Priority date: 2019-10-21
Filing date: 2019-10-21
Publication date: 2020-06-05
Anticipated expiration: 2029-10-21

Abstract

The utility model relates to a seat technical field's an adjustable back link gear, including the cushion support of installing the cushion, further include: the cushion fixed frame, the swing connecting rod group, the chair back and the chair back bracket; the seat back bracket is rotationally connected with the seat cushion fixed frame, the seat cushion bracket is rotationally connected with the seat back bracket, and the seat cushion bracket is movably connected with the seat cushion fixed frame in a forward and backward swinging manner through the swinging connecting rod group, so that the seat cushion bracket and the swinging connecting rod group swing forwards together when the seat back bracket tilts backwards; the upper end of the chair back can be connected with the upper end of the chair back bracket in a way of turning up and down. When the chair back support is inclined backwards under the pressure of the back of a human body, the cushion support can synchronously swing forwards through transmission to adjust the position of the cushion, and meanwhile, the front and back positions of the chair back relative to the chair back support can be adjusted to be tightly attached to the waist.

Description

Adjustable backrest linkage mechanism

Technical Field

The utility model relates to a seat technical field particularly, is adjustable seat.

Background

Massage chairs have become more and more popular in everyday life, and the comfort level of the massage chair can greatly improve the quality of life of users. Office massage armchair in the existing market mostly adopts general standardized chassis, and general chassis can incline in certain angle and face upward, but the in-process of facing upward that inclines, user's shank can be lifted on, and user's shank can be extruded to the cushion bottom. The cushion inclines and faces upward simultaneously, the gravity center moves backwards, the extrusion of the whole human body to the lumbar vertebra and the legs becomes stronger, and the spine of the user is stressed more. Meanwhile, as the relationship between the seat cushion and the chair back can not be adjusted, the waist can be in a suspended state in the process of inclining upwards, and more irreversible damage is brought to the waist of a user.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an adjustable back link gear, when the back of the chair leaned on the seat and is leaned on the back by human back pressure and incline backward, the cushion support can be through the transmission forward swing in step to adjust the position of cushion, also can adjust the back of the chair for back of the chair support front and back position simultaneously, in order closely to laminate the waist.

The purpose of the utility model is realized like this: an adjustable backrest linkage mechanism, comprising a cushion bracket (2) mounted with a cushion (1), further comprising: a cushion fixed frame (7), a swing connecting rod group, a chair back (10) and a chair back bracket (8); the seat back support (8) is rotatably connected with the seat cushion fixed frame (7), the seat cushion support (2) is rotatably connected with the seat back support (8), and the seat cushion support (2) is movably connected with the seat cushion fixed frame (7) in a front-back swinging manner through the swinging connecting rod group, so that the seat cushion support (2) and the swinging connecting rod group swing forwards together when the seat back support (8) tilts backwards; the upper end of the chair back (10) can be connected with the upper end of the chair back bracket (8) in a vertically-overturning manner.

Further, a locking assembly (12) for locking the relative angle between the chair back (10) and the chair back bracket (8) is also included.

Further, the swing linkage group at least comprises a pair of front swing rods (3) which are respectively arranged at the left side and the right side of the cushion support (2), the lower ends of the front swing rods (3) are rotatably connected with the cushion fixing frame (7), and the upper ends of the front swing rods (3) are rotatably connected with the cushion support (2).

Furthermore, the rotation axis of the lower end of the front swing rod (3) is horizontally arranged, the upper end of the front swing rod (3) is rotatably connected with the front side of the cushion support (2), and the rear side of the cushion support (2) is rotatably connected with the chair back support (8).

Further, be equipped with a pair of cushion spring (4) that can make cushion support (2) reset between cushion support (2) and cushion surely frame (7), two cushion springs (4) branch are located cushion support (2) left and right sides, cushion spring (4) both ends are connected with cushion support (2), cushion surely frame (7) respectively, cushion spring (4) are along the flexible setting of the swing direction of cushion support (2).

Furthermore, the swing connecting rod group is provided with a swing angle limiting component in a matching way so as to limit the range of the front swing rod (3) swinging back and forth.

Further, the number of the swing angle limiting components is equal to that of the front swing rods (3) and corresponds to one.

Furthermore, the swing angle limiting assembly comprises a limiting protrusion (5) and a supporting protrusion (6), the limiting protrusion (5) and the supporting protrusion (6) are fixed on the cushion fixing frame (7), and the limiting protrusion (5) and the supporting protrusion (6) are respectively arranged at the front position and the rear position of the front swing rod (3).

Further, when the cushion bracket (2) is in a reset state, the front swing rod (3) leans against the support protrusion (6).

Further, back of the chair support (8) upper end is equipped with a pair of upper rotating support (9) of arranging about, back of the chair (10) upper end rotates from top to bottom and connects two upper rotating support (9), locking subassembly (12) are installed on cushion fixed frame (7), and under the locking state locking subassembly (12) are joined in marriage with the downside lock of back of the chair (10).

Further, the chair back (10) is provided with an adjusting strip (11) extending backwards, and the locking assembly (12) is matched with the adjusting strip (11) and used for locking the position of the adjusting strip (11).

Furthermore, adjusting strip (11), locking subassembly (12) all are equipped with two, and control and arrange, adjusting strip (11), locking subassembly (12) match one by one.

Further, locking subassembly (12) are including telescopic shaft (12b), locking pinion rack (12c) and control the subassembly, telescopic shaft (12b) level wears dress cushion fixed frame (7), telescopic shaft (12b) one end fixed mounting locking pinion rack (12c), telescopic shaft (12b) other end exposes and installs the subassembly of controlling that drives telescopic shaft (12b) axial activity, locking pinion rack (12c) and regulation strip (11) are arranged relatively, the opposite side of locking pinion rack (12c), regulation strip (11) is the flank of tooth structure, the flank of tooth of locking pinion rack (12c) and the flank of tooth meshing of regulation strip (11) under the locking state.

Further, be equipped with back of the chair spring (13) between back of the chair (10) and back of the chair support (8), back of the chair (10), back of the chair support (8) are connected respectively to back of the chair spring (13) both ends, back of the chair spring (13) are along the flexible setting of the upset direction of back of the chair (10) and are pushed up back of the chair (10) forward all the time.

The beneficial effects of the utility model reside in that:

1) there are two important degrees of freedom of adjustment: firstly, when the chair back and the chair back support are inclined backwards under the pressure of the back of a human body, the cushion support can synchronously swing forwards through transmission so as to adjust the position of the cushion; secondly, the upper side of the chair back can turn over forwards and backwards by taking the upper side of the chair back bracket as a reference, then the turning angle of the chair back is locked by the locking assembly, the front and back positions of the chair back relative to the chair back bracket can be finely adjusted, so that the waist is tightly attached, the waist load is reduced, and the resetting of the cushion bracket is facilitated due to the arrangement of the cushion spring;

2) when the flip angle of the back of the chair is adjusted, the forerunner makes the telescopic shaft slide outward, thereby making the locking toothed plate loose from the tooth surface of the adjusting strip, driving the back of the chair to overturn forward under the elastic force action of the back of the chair spring, driving the telescopic shaft to slide inward when the back of the chair overturns to a proper angle, driving the locking toothed plate to engage the tooth surface of the adjusting strip, thereby completing the adjustment and locking the back of the chair at a proper angle, and the locking mode is simple and easy to operate.

Drawings

Fig. 1 is an assembly view of the present invention.

Fig. 2 is a schematic view showing the mounting relationship of the seat back and the seat back bracket.

Fig. 3 is a schematic view of the adjustment principle of the chair back.

Fig. 4 is a perspective view of the chair back and the chair back bracket.

Fig. 5 is a schematic view of the construction details of the seat back and swing linkage.

Fig. 6 is a schematic view of the relationship of the seat back bracket, the seat cushion bracket, and the swing linkage.

Fig. 7 is a schematic side positional relationship of the seatback bracket, the seat cushion bracket, and the swing link group.

FIG. 8 is a schematic view of the locking assembly and the locking manner of the adjustment bar.

In the figure, 1 cushion, 2 cushion supports, 3 preceding swing rods, 4 cushion springs, 5 spacing protrusions, 6 support protrusions, 7 cushion fixed supports, 7a back support protrusions, 8 back support supports, 9 upper rotating supports, 10 back of the chair, 11 adjusting strips, 12 locking assemblies, 12a adjusting knobs, 12b telescopic shafts, 12c locking toothed plates, 12d adjusting studs, 13 back of the chair springs and 14 rotating supporting shafts.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1, 6 and 7, an adjustable backrest linkage mechanism includes a seat cushion bracket 2 mounted with a seat cushion 1, and further includes: a cushion fixed frame 7, a swing connecting rod group, a chair back 10 and a chair back bracket 8; the seat back bracket 8 is rotationally connected with the seat cushion fixed frame 7, the seat cushion bracket 2 is rotationally connected with the seat back bracket 8, and the seat cushion bracket 2 is movably connected with the seat cushion fixed frame 7 in a front-back swinging manner through a swinging connecting rod group, so that the seat cushion bracket 2 and the swinging connecting rod group swing forwards together when the seat back bracket 8 tilts backwards; the upper end of the chair back 10 can be connected with the upper end of the chair back bracket 8 in a vertically-overturning manner, and in the embodiment, the leaning side curve of the chair back 10 is matched with the curve of the back of a human body so as to ensure the comfort of leaning on the back.

When the chair is taken, the seat cushion support 2 can synchronously swing forwards through transmission to adjust the position of the seat cushion 1 while the chair back 10 and the chair back support 8 are inclined backwards under the pressure of the back of a human body.

The swing connecting rod group comprises a pair of front swing rods 3 which are respectively positioned at the left side and the right side of the cushion bracket 2, the lower ends of the front swing rods 3 are rotatably connected with the cushion fixed frame 7, and the upper ends of the front swing rods 3 are rotatably connected with the cushion bracket 2.

The rotation axis of the lower end of the front swing rod 3 is horizontally arranged, the upper end of the front swing rod 3 is rotatably connected with the front side of the cushion bracket 2, and the rear side of the cushion bracket 2 is rotatably connected with the chair back bracket 8.

A pair of cushion springs 4 capable of enabling the cushion support 2 to reset are arranged between the cushion support 2 and the cushion fixed frame 7, the two cushion springs 4 are respectively arranged on the left side and the right side of the cushion support 2, two ends of each cushion spring 4 are respectively connected with the cushion support 2 and the cushion fixed frame 7, and the cushion springs 4 are arranged in a telescopic mode along the swinging direction of the cushion support 2. When the user does not need to lean, the pressure on the seat back 10 and the seat back bracket 8 is released, the seat cushion bracket 2 is driven to swing backwards under the action of the resilience force of the seat cushion spring 4, and meanwhile, the seat back 10 and the seat back bracket 8 swing forwards, so that the user can sit upright normally.

As shown in fig. 6 and 7, the swing link assembly is provided with a swing angle limiting component to limit the range of forward and backward swing of the front swing rod 3; the number of the swing angle limiting components is equal to that of the front swing rods 3 and corresponds to that of the front swing rods one by one; the swing angle limiting assembly comprises a limiting bulge 5 and a supporting bulge 6, the limiting bulge 5 and the supporting bulge 6 are both fixed on a cushion fixing frame 7, and the limiting bulge 5 and the supporting bulge 6 are respectively positioned at the front and back positions of the front swing rod 3, so that the swing angle range of the front swing rod 3 is 20-30 degrees, and the swing angle range of the swing connecting rod group is 20-30 degrees; the front swing rod 3 leans against the support protrusion 6 when the seat cushion frame 2 is in the reset state. The swing angle of the front swing rod 3 is small, the problem of center of gravity shift in the tilting process is solved, and meanwhile, the situation that the leg of a user is extruded by the cushion 1 after the user tilts up is avoided.

As shown in fig. 1-4, the present embodiment further includes a locking assembly 12 for locking the relative angle between the seat back 10 and the seat back bracket 8.

The upper end of the chair back support 8 is provided with a pair of upper rotating supports 9 which are arranged left and right, the upper end of the chair back 10 is connected with the two upper rotating supports 9 in an up-and-down rotating mode, the locking assembly 12 is installed on the cushion fixing frame 7, and the locking assembly 12 is matched with the lower side of the chair back 10 in a locking mode.

The backrest 10 is provided with a rearwardly extending adjustment bar 11, and a locking assembly 12 is associated with the adjustment bar 11 and is used to lock the position of the adjustment bar 11.

Above-mentioned regulation strip 11, locking subassembly 12 all are equipped with two, and control and arrange, and regulation strip 11, locking subassembly 12 match one by one.

The locking assembly 12 comprises a telescopic shaft 12b, a locking toothed plate 12c and an operation and control assembly, the cushion fixing frame 7 is horizontally arranged on the telescopic shaft 12b in a penetrating mode, the locking toothed plate 12c is fixedly installed at one end of the telescopic shaft 12b, the operation and control assembly for driving the telescopic shaft 12b to move axially is installed at the other end of the telescopic shaft 12b in an exposed mode, the locking toothed plate 12c and the adjusting strip 11 are arranged oppositely, opposite sides of the locking toothed plate 12c and the adjusting strip 11 are both of a toothed surface structure, and the toothed surface of the locking toothed plate 12c is meshed with the toothed surface of the adjusting strip 11 in a locking state.

A chair back spring 13 is arranged between the chair back 10 and the chair back bracket 8, two ends of the chair back spring 13 are respectively connected with the chair back 10 and the chair back bracket 8, and the chair back spring 13 is arranged in a telescopic way along the turning direction of the chair back 10 and pushes the chair back 10 forwards all the time.

As shown in fig. 5 and 8, the rear side of the seat cushion frame 7 is provided with a rear supporting protrusion 7a extending upward, and the rotating support shaft 14 is fixed on the rear supporting protrusion 7a, in this embodiment, there are two rotating support shafts 14, which are arranged symmetrically left and right, and correspond to two locking assemblies 12 one by one, the seat back frame 8 is vertically and rotatably supported on the rear supporting protrusion 7a of the seat cushion frame 7 through the rotating support shaft 14, and the locking assemblies 12 pass through the rotating support shaft 14 of the seat back frame 8 to lock the adjusting bar 11. In the present embodiment, the pivotal connection point of the seat cushion bracket 2 and the seatback bracket 8 is located below the pivot support shaft 14.

The adjusting bar 11 is of a rack structure, the telescopic shaft 12b axially slidably penetrates through the rotating support shaft 14 and is coaxial with the rotating support shaft 14, one end of the telescopic shaft 12b is located on one shaft side of the rotating support shaft 14 and is fixed with a locking toothed plate 12c capable of being meshed with the toothed surface of the adjusting bar 11, the other end of the telescopic shaft 12b is located on the other shaft side of the rotating support shaft 14 and is provided with an adjusting stud 12d extending outwards, an adjusting knob 12a is coaxially sleeved on the adjusting stud 12d and is in threaded connection with the adjusting knob 12a, and the adjusting knob 12a is coaxially and rotatably connected with the rotating support shaft 14.

When adjusting the flip angle of back of the chair 10, twist earlier and move adjusting knob 12a, adjusting knob 12a and adjusting stud 12d screw-thread fit, the rotary motion who turns into adjusting knob 12a is the linear motion of telescopic shaft 12b, make telescopic shaft 12b outwards slide, thereby make locking pinion rack 12c loosen the flank of tooth from adjusting strip 11, order about back of the chair 10 forward upset under back of the chair spring 13's elasticity effect, when back of the chair 10 overturns to suitable angle, twist adjusting knob 12a once more, make telescopic shaft 12b inwards slide through screw-thread fit's mode, make locking pinion rack 12c mesh adjusting strip 11's flank of tooth, thereby accomplish the regulation and lock back of the chair 10 in suitable angle.

The above are preferred embodiments of the present invention, and those skilled in the art can make various changes or improvements on the above embodiments without departing from the general concept of the present invention, and such changes or improvements should fall within the protection scope of the present invention.

Claims

1. The utility model provides an adjustable back link gear, is including installing cushion support (2) of cushion (1), its characterized in that further includes: a cushion fixed frame (7), a swing connecting rod group, a chair back (10) and a chair back bracket (8); the seat back support (8) is rotatably connected with the seat cushion fixed frame (7), the seat cushion support (2) is rotatably connected with the seat back support (8), and the seat cushion support (2) is movably connected with the seat cushion fixed frame (7) in a front-back swinging manner through the swinging connecting rod group, so that the seat cushion support (2) and the swinging connecting rod group swing forwards together when the seat back support (8) tilts backwards; the upper end of the chair back (10) can be connected with the upper end of the chair back bracket (8) in a vertically-overturning manner.

2. An adjustable backrest linkage mechanism according to claim 1, wherein: and the chair also comprises a locking assembly (12) for locking the relative angle between the chair back (10) and the chair back bracket (8).

3. An adjustable backrest linkage mechanism according to claim 1, wherein: the swing connecting rod group at least comprises a pair of front swing rods (3) which are respectively arranged at the left side and the right side of the cushion support (2), the lower ends of the front swing rods (3) are rotatably connected with the cushion fixing frame (7), and the upper ends of the front swing rods (3) are rotatably connected with the cushion support (2).

4. An adjustable backrest linkage according to claim 3, wherein: the rotation axis of the lower end of the front swing rod (3) is horizontally arranged, the upper end of the front swing rod (3) is rotatably connected with the front side of the cushion support (2), and the rear side of the cushion support (2) is rotatably connected with the chair back support (8).

5. An adjustable backrest linkage according to claim 3, wherein: be equipped with a pair of cushion spring (4) that can make cushion support (2) reset between cushion support (2) and cushion surely frame (7), two cushion spring (4) branch departments cushion support (2) the left and right sides, cushion spring (4) both ends are connected with cushion support (2), cushion surely frame (7) respectively, the flexible setting of swing direction along cushion support (2) is decided in cushion spring (4).

6. An adjustable backrest linkage according to claim 3, wherein: the swing connecting rod group is provided with a swing angle limiting component in a matching way so as to limit the range of the front swing rod (3) swinging back and forth.

7. An adjustable backrest linkage according to claim 6, wherein: the number of the swing angle limiting components is equal to that of the front swing rods (3) and corresponds to that of the front swing rods one to one.

8. An adjustable backrest linkage according to claim 6, wherein: the swing angle limiting assembly comprises a limiting protrusion (5) and a supporting protrusion (6), wherein the limiting protrusion (5) and the supporting protrusion (6) are fixed on the cushion fixing frame (7), and the limiting protrusion (5) and the supporting protrusion (6) are respectively arranged at the front and the back of the swing rod (3).

9. An adjustable backrest linkage according to claim 8, wherein: when the cushion bracket (2) is in a reset state, the front swing rod (3) leans against the support protrusion (6) obliquely.

10. An adjustable backrest linkage according to claim 2, wherein: the utility model discloses a seat back of chair, including back of chair support (8), back of chair support (8) upper end is equipped with a pair of upper rotating support (9) of arranging about, back of chair (10) upper end rotates from top to bottom and connects two upper rotating support (9), locking subassembly (12) are installed on cushion fixed frame (7), and under the lock-out state locking subassembly (12) are joined in marriage with the downside lock of back of chair (10).

11. An adjustable backrest linkage according to claim 10, wherein: the chair back (10) is provided with an adjusting strip (11) extending backwards, and the locking assembly (12) is matched with the adjusting strip (11) and used for locking the position of the adjusting strip (11).

12. An adjustable backrest linkage according to claim 11, wherein: the adjusting strip (11) and the locking assembly (12) are arranged in a left-right mode, and the adjusting strip (11) and the locking assembly (12) are matched one by one.

13. An adjustable backrest linkage according to claim 11, wherein: the locking subassembly (12) include telescopic shaft (12b), locking pinion rack (12c) and control the subassembly, telescopic shaft (12b) level is worn to adorn cushion fixed bolster (7), telescopic shaft (12b) one end fixed mounting locking pinion rack (12c), telescopic shaft (12b) other end exposes and installs the subassembly of controlling that drives telescopic shaft (12b) axial activity, locking pinion rack (12c) and regulation strip (11) mutual disposition, the opposite side of locking pinion rack (12c), regulation strip (11) is the flank of tooth structure, the flank of tooth of locking pinion rack (12c) and the flank of tooth meshing of regulation strip (11) under the locking state.

14. An adjustable backrest linkage according to claim 11, wherein: be equipped with back of the chair spring (13) between back of the chair (10) and back of the chair support (8), back of the chair (10), back of the chair support (8) are connected respectively to back of the chair spring (13) both ends, back of the chair spring (13) are along the flexible setting of the upset direction of back of the chair (10) and are pushed up back of the chair (10) forward all the time.