CN206462690U - Curvature adjustment device for backrest - Google Patents

Abstract

A device for adjusting the curvature of a chair back comprises a flexible chair back, a back frame, a pull rope and a driving mechanism, wherein the chair back has a fixed end and a movable end, the fixed end is connected to the back frame and is immovable, and the movable end is connected to the pull rope; the pull rope has a connecting end and a driving end, the connecting end is connected to the movable end of the chair back, and the driving end is connected to the driving mechanism, and the driving mechanism is connected to the back frame; by controlling the path of the pull rope by the driving mechanism, the curvature of the chair back can be changed to make it more close-fitting to the back.

Description

Curvature adjustment device for backrest

technical field

The utility model relates to a seat for providing people with a comfortable ride, in particular to a seat device that can adjust the curvature of the back of the seat according to the needs of use, so as to make it more suitable for the back.

Background technique

In order to increase the comfort of riding, the back fit of the seat back is absolutely one of the indispensable factors. Especially in the lumbar part, if the long-term sitting posture is not properly supported, not only will you feel back pain, but it may even cause permanent damage such as spinal deformation.

In the existing technical literature, there are patents including China Taiwan Announcement No. I327901 "Cushion Body Adjustment System" and No. I373317 "Chair Pad Body Structure Improvement" and other patents that discuss this issue. Among them, the No. I327901 patent uses a complex air bag circuit to inflate the back of the seat to change its curvature, so that the occupant's waist and back can be supported. Although it can achieve a certain effect, the cost is expensive, and these inflatable components It must be buried in the back of the chair, and it will be difficult to repair and maintain if it breaks down or produces a wrong action.

As for the No. I373317 patent, a plurality of elastic pads are installed in front of the back of the chair, and the elastic pads are deformed to support the back of the human body through the traction of the pull cord. Although the structure is relatively simple, these elastic pads are still covered in If there is a fault or wrong action in the foam, the foam must be removed and separated from the back of the chair during maintenance. Support, and the deformation of the seat back is limited, it is difficult to meet the needs of the occupants.

Utility model content

The common problems in the previous technologies are: the mechanism for adjusting the curvature of the chair back is buried between the back of the chair and the foam, which causes difficulties in overhaul and maintenance, and is easy to cause damage to the back of the chair during disassembly; and the design of the mechanism Complicated and costly to manufacture.

The utility model provides a more novel and progressive design of "the device for adjusting the curvature of the chair back", which includes a flexible chair back, a back frame, a pull cord and a driving mechanism, wherein the chair back has A fixed end and a movable end, the fixed end is connected to the back frame, and the movable end is connected to the pull cord; the pull cord has a connecting end and a driving end, the connecting end is connected with the movable end of the chair back, and the driving end It is then connected to the driving mechanism, which is connected to the back frame.

The purpose of the utility model is: by controlling the path of the pull rope through the driving mechanism, the curvature of the back of the chair can be changed to have a more back-fitting property. Not only is it easy to assemble or disassemble, but besides the drawstring, other mechanisms are outside the back frame, which is more convenient for inspection and maintenance.

Further, the back frame has at least one positioning portion, and the drawstring is looped around the back frame through the positioning portion.

Further, the position of the positioning part is relatively higher than that of the driving mechanism.

Further, the driving mechanism has a driving shaft, an operating unit, a slider, and a limiting unit; the operating unit is arranged at one end of the driving shaft to drive the driving shaft in rotation, and the surface of the driving shaft is provided with threads Screwed with the slide block, the slide block is connected with the driving end of the pull cord, the slide block is contained by the limit unit and is constrained by rotation, and the limit unit has a passage for providing the moving position of the slide block.

Further, a shaft is sheathed on the movable end of the chair back, and the connecting end of the pull cord is connected to the shaft.

Further, the support shaft has a first through hole for the connection end of the pull cord to pass through, and a stopper for preventing the support shaft from falling off is provided on the connection end.

Further, two opposite sides of the back frame are respectively provided with a long guide hole for the two ends of the support shaft to pass through.

Further, a sleeve is sheathed on the outside of the pull cord.

Further, the other end of the fulcrum is provided with a second through hole through which the pull cord passes.

Further, a sleeve is sheathed on the outside of the pull cord, and the sleeve has a breaking point of escape near the second through hole, so that the fulcrum can pass through the sleeve to avoid interference.

As for other detailed structures of the present utility model and the effects produced, please refer to the following implementation manners for detailed description.

Description of drawings

Fig. 1 is a perspective view of the utility model.

Fig. 2 is an exploded view of the chair back and the back frame of the present invention.

Fig. 3 is an exploded view of the back frame of the present invention.

Fig. 4 is an enlarged view of the driving mechanism of the present invention.

Fig. 5 is the relative initial state of the chair back of the present invention, mainly showing the corresponding relationship between the driving mechanism and the pull cord.

Fig. 6 is in conjunction with Fig. 5, showing the relative initial state of the seat back from a side view.

Fig. 7 is a schematic diagram of the operation of the utility model, through the operation of the driving mechanism, it shows the changes produced by the pull rope driving the fulcrum.

FIG. 8 is in conjunction with FIG. 7 , showing the use state after the curvature of the chair back is adjusted from a side view.

Explanation of reference signs:

1 chair back

10 fixed end

11 Active side

12 Support shaft

120 First piercing

121 Second piercing

2 back frame

20 Positioning Department

21 Guide hole

3 drawstring

30 connection end

300 block

31 Drive end

32 Casing

320 breakpoint

4 drive mechanism

40 drive shaft

400 thread

41 Operating unit

42 slider

43 Limiting unit

430 channels.

detailed description

As shown in Figures 1 to 4, the utility model includes a flexible chair back 1, a back frame 2, a pull cord 3 and a driving mechanism 4, wherein the chair back 1 has a fixed end 10 and a The movable end 11, the fixed end 10 is fixedly connected with the back frame 2, and the movable end 11 is connected to the pull rope 3; 30 is connected to the movable end 11 of the chair back 1, and the driving end 31 is connected to the driving mechanism 4, which is connected to the back frame 2; the path of the pull rope 3 can be controlled by the driving mechanism 4, so that the movement of the chair back 1 The curvature changes for a more snug fit.

3 and 4, the drive mechanism 4 has a drive shaft 40, an operating unit 41, a slider 42, and a limit unit 43; the operating unit 41 is located at one end of the drive shaft 40 to rotate The driving shaft 40 is driven by the driving shaft 40. The surface of the driving shaft 40 is provided with a screw thread 400 and the slider 42 is screwed. The restraint, and the limit unit 43 has a channel 430 for providing the moving position of the slider 42 . During operation, force is applied to the operating unit 41 to drive the drive shaft 40 to rotate, and the slider 42 screwed on the drive shaft 40 cannot rotate due to the restraint of the limit unit 43, and can only be driven by the thread 400 in the channel 430. To shift, and at the same time pull the pull cord 3 to change the relative position of the movable end 11 of the chair back 1.

Preferably, there is at least one positioning part 20 on the back frame 2, and the position of the positioning part 20 is relatively higher than that of the driving mechanism 4, so as to provide positioning when the pull cord 3 wraps around the chair back 1, and also serves as the pull cord 3 in the traction chair. The movable end 11 of the back 1 is the fulcrum for applying force; the outer sleeve of the pull rope 3 is provided with a sleeve 32 to protect the pull rope 3 and reduce the loss caused by friction. In addition, a shaft 12 is sheathed on the movable end 11 of the chair back 1, and the connecting end 30 of the pull cord 3 is connected to the supporting shaft 12; As shown, the support shaft 12 has a first through hole 120 for the connection end 30 of the stay cord 3 to pass through, and a stopper 300 is provided on the join end 30 to prevent the support shaft 12 from falling off. The connection method of the movable end 11 of the back 1 allows the support shaft 12 to be replaced without causing damage to the chair back 1 . In addition, on the other end of the support shaft 12, there is also a second through hole 121 through which the stay rope 3 passes, so that the support shaft 12 can move freely in the stay cord 3; There is an escape break point 320 at the position, so that the fulcrum 12 can pass through the sleeve 32 to avoid interference.

In order to maintain the stability of the movable end 11 of the chair back 1, a long guide hole 21 is provided on two opposite sides of the back frame 2 to allow the two ends of the support shaft 12 to pass through, and then the support shaft 12 is sleeved on the chair. on the movable end 11 of the seat back 1, so that the path and stroke of the movable end 11 of the chair back 1 are restricted; such a design can avoid arbitrary deviation of the movable end 11 of the seat back 1 during actuation, and the guide hole 21 The length also limits the stroke of the movable end 11 so that the chair back 1 will not be deformed excessively.

Please refer to Figure 5 to Figure 8 at the same time. In the initial state, as shown in Figure 5 and Figure 6, the movable end 11 of the chair back 1 is at a lower position relative to the back frame 2, and the two ends of the support shaft 12 respectively fall into the guide holes 21 on both sides of the back frame 2; , rotate the operating unit 41 to rotate the drive shaft 40, and the thread 400 on the drive shaft 40 drives the slider 42 to run in the channel 430 of the limit unit 43. As mentioned above, the limit unit 43 restricts the slider 42 from rotating However, it can only be displaced axially in the channel 430, as shown in Figure 7, the slider 42 moves from the left side of the drawing to the right side, and at the same time it also pulls the pull cord 3 to drive its connecting end 30 .

The connecting end 30 of the stay rope 3 is connected to the supporting shaft 12, and the stay rope 3 is surrounded by the positioning part 20 around the back frame 2, so the supporting shaft 12 moves from the relatively low position of the guide hole 21 to a high position, which of course also drives the The movable end 11 of the chair back 1 connected to the support shaft 12, as shown in Figure 8, since the chair back 1 is flexible, when the fixed end 10 is fixed on the back frame 2, the position change of the movable end 11 will be The chair back 1 is forced to deform to change its original curvature, and the adjustment of this curvature can be changed along with the position of the driving slider 42, and is fixed immediately when the driving shaft 40 stops rotating. The curvature of the chair back 1 can be adjusted, which can better meet the user's requirements for backrest or lumbar support when riding, and is more practical.

The above-mentioned embodiments are only preferred embodiments for fully illustrating the utility model, and the protection scope of the utility model is not limited thereto. Equivalent substitutions or transformations made by those skilled in the art on the basis of the present utility model are all within the protection scope of the present utility model. For example: In addition to the above-mentioned embodiments, the pull cord 3 of the present utility model may not wrap around the back frame 2, as shown in Figure 8, if the initial state of the chair back 1 is a state with a large curvature, the driving mechanism 4 The pulling rope 3 can directly pull down the movable end 11 of the chair back 1 to adjust the curvature of the chair back 1 as shown in Figure 6 ; to recover, just operate the driving mechanism 4 in the opposite direction.

Claims (10)

1. A device for adjusting the curvature of a chair back, comprising a flexible chair back, a back frame, a stay cord and a driving mechanism, characterized in that the chair back has a fixed end and a movable end, the The fixed end is connected to the back frame, and the movable end is connected to the pull cord. The pull cord has a connecting end and a driving end. The connecting end is connected to the movable end of the chair back, and the driving end is connected to the driving mechanism; Controlling the path of the pull cord can change the curvature of the chair back. 2 . The device for adjusting the curvature of the chair back according to claim 1 , wherein the back frame has at least one positioning portion, and the pull cord is looped around the back frame through the positioning portion. 3 . 3 . The device for adjusting the curvature of the chair back according to claim 2 , wherein the position of the positioning portion is relatively higher than that of the driving mechanism. 4 . 4. The curvature adjusting device of the chair back according to claim 1, 2 or 3, wherein the drive mechanism has a drive shaft, an operating unit, a slider, and a limit unit; the operating unit It is located at one end of the drive shaft and drives the drive shaft in a rotating manner. The surface of the drive shaft is threaded and connected to the slider. The slider is connected to the driving end of the pull rope. The slider is contained by the limit unit and is rotated. The restraint, and there is a channel in the limit unit to provide the moving position of the slider. 5. The device for adjusting the curvature of the chair back according to claim 1, 2 or 3, wherein a shaft is sleeved on the movable end of the chair back, and the connecting end of the pull cord is connected to the shaft . 6. The device for adjusting the curvature of the chair back according to claim 5, wherein the fulcrum has a first through hole for the connecting end of the stay cord to pass through, and the connecting end is provided with a preventive fulcrum Fragmented pieces. 7 . The device for adjusting the curvature of the chair back according to claim 5 , wherein two opposite sides of the back frame are respectively provided with a long guide hole through which two ends of the fulcrum pass. 8 . 8 . The device for adjusting the curvature of the chair back according to claim 1 , 2 or 3 , wherein a sleeve is sheathed on the outside of the pull cord. 9 . The device for adjusting the curvature of the chair back according to claim 6 , wherein the other end of the fulcrum is provided with a second hole through which the pull cord passes. 10 . 10. The device for adjusting the curvature of the chair back according to claim 9, characterized in that a sleeve is sheathed on the outside of the stay cord, and the sleeve has a breaking point for avoiding a position close to the second perforation, so that the support The shaft can pass through this sleeve avoiding interference.