Seat back system and wheelchair

Abstract

The present application relates to a kind of seat backrest systems, including backrest body and rotating adjustment system, backrest body includes two fixed rods, left backrest piece, right backrest piece and binding system, two fixed rods are respectively left fixed rod, right fixed rod, the left side of left backrest piece is fixed on left fixed rod, the right side of right backrest piece is fixed on right fixed rod, the right side of left backrest piece and the left side of right backrest piece are connected by binding system, rotating adjustment system is connected with two fixed rods respectively, for making two fixed rods rotate displacement in the same plane, rotation angle is acute angle.After loosening binding system, the inclination of left fixed rod and right fixed rod can be adjusted by rotating adjustment system, so that backrest body is skewed, and more matched with the back of user, after adjusting inclination, binding system can be pulled again.Two fixed rods are connected by rotating adjustment system, for making two fixed rods rotate displacement in the same plane, rotation angle is acute angle.The present application also relates to a kind of wheelchair comprising the seat backrest system.

Description

TECHNICAL FIELD

[0001] The present application relates to a seat back system. BACKGROUND

[0002] The seat back of the current wheelchair is in the middle, and the structure is symmetrical left and right, which cannot be adjusted to be inclined to the left or right. It can provide better support for the user with a central back posture, but for the user with a skewed back posture, the middle line of the back and the middle line of the seat back are crossed when the user sits on the wheelchair, and the seat back cannot exert appropriate support on the user's back, affecting the user's riding experience. SUMMARY

[0003] The technical problem to be solved by the present application is to provide a seat back system which can be used in a wheelchair to provide appropriate support for users with skewed backs.

[0004] To solve the above technical problems, the present application provides a seat back system, which comprises a back body and a rotation adjustment system, the back body comprises two fixed rods, a left back piece, a right back piece and a binding system, the two fixed rods are respectively a left fixed rod and a right fixed rod, the left side of the left back piece is fixed on the left fixed rod, the right side of the right back piece is fixed on the right fixed rod, the right side of the left back piece and the left side of the right back piece are connected through the binding system, the rotation adjustment system is connected with the two fixed rods respectively, and is used for rotating and displacing the two fixed rods in the same plane, and the rotation angle is an acute angle.

[0005] After loosening the binding system, the inclination of the left fixed rod and the right fixed rod can be adjusted through the rotation adjustment system, so that the back body is skewed and more matched with the user's back, and the inclination is adjusted and then the binding system is tightened.

[0006] The present application also provides a wheelchair comprising the above seat back system. BRIEF DESCRIPTION OF DRAWINGS

[0007] ATTACHMENT Figures 1 to 9 The seat back system of the first embodiment of the present application is comprehensively displayed, wherein:

[0008] Figure 1 is a perspective view of the wheelchair;

[0009] Figure 2 is an exploded view of the seat back system;

[0010] Figure 3 is an exploded view of the back body;

[0011] Figure 4 is an exploded view of the upper left support, the upper right support and the upper horizontal rod;

[0012] Figure 5and 6 are perspective and front views of the seat back system with the back body centered, respectively;

[0013] Figure 7 and 8 are perspective and front views of the seat back system with the back body tilted to the right, respectively;

[0014] Figure 9 is a front view of the seat back system with the left back piece tilted to the right and the right back piece tilted to the left. DETAILED DESCRIPTION

[0015] The present application provides a seat back system whose back body can be adjusted to tilt to the left and to the right (as shown in Figure 8 , if necessary, the back body can also be adjusted to a trapezoidal structure (as shown in Figure 9 ). The seat back is designed to solve the back support problem of wheelchair users with a tilted back, but can also be used in other seat products.

[0016] The present application will be further described in conjunction with the drawings and specific embodiments of the present application. Embodiment One

[0017] This embodiment provides a seat back system, which is installed on a wheelchair, as shown in Figure 1 . The seat back system mainly consists of a back body and a rotating adjustment system, the back body mainly consists of a left fixed rod 1L, a right fixed rod 1R, a left back piece 2L, a right back piece 2R and a strap system 3, the two fixed rods (referring to the left fixed rod 1L and the right fixed rod 1R) are mirror-symmetric structures, which are aluminum profiles, as shown in Figure 3 , the fixed rods are not solid rod bodies, the front part has a special-shaped through slot for installing the back pieces (referring to the left back piece 2L and the right back piece 2R), and the rear part has a C-shaped through slot X for installing a fixed block X1.

[0018] The left back piece 2L and the right back piece 2R are cloth, the strap system 3 includes a plurality of straps 31 and corresponding fixed buckles 32, the straps 31 are arranged along the width direction w of the back body, and the plurality of straps 31 are arranged at intervals along the height direction h of the back body, the fixed end of the strap 31 is sewn to the rear side of the right back piece 2R, and the fixed buckle 32 is fixed to the rear side of the left back piece 2L through the cloth belt sewn on the left back piece 2L. Figure 2 , 3 , 5, 7, the strap 31 does not pass through the fixed buckle 32. In Figure 1 , 6 , 8, 9, the strap 31 passes through the fixed buckle 32, and the strap 31 is clamped and fixed by the fixed buckle 32 after being straightened.

[0019] The rotation adjustment system mainly comprises four supports, an upper cross bar 41, a lower cross bar 42, four screw sets and two locking mechanisms. The four supports are an upper left support 43L, an upper right support 43R, a lower left support 44L and a lower right support 44R. The upper left support 43L and the lower left support 44L are each fixedly connected to the fixing block X1 in the left fixing rod 1L through a screw set. The upper right support 43R and the lower right support 44R are each fixedly connected to the fixing block X1 in the right fixing rod 1R through a screw set. The fixing block X1 is an iron piece, which is provided with a plurality of threaded holes. The supports are plastic pieces. When the screw sets are locked, the fixing block X1 and the corresponding support clamp the side wall of the corresponding fixing rod, so that the friction between the inner side of the fixing rod and the fixing block X1 and the friction between the outer side of the fixing rod and the support are increased, and the fixing between the support and the corresponding fixing rod is realized. The reason for designing the fixing block X1 and the C-shaped through slot X is that the cost of aluminum profile with light weight and high hardness is high. Therefore, the fixing rod is made of aluminum profile with light weight and moderate hardness, which is not suitable for being provided with threaded holes. Therefore, the fixing between the support and the fixing rod cannot be realized by directly screwing the screw set with the fixing rod. The fixing block X1 is provided, which is made of iron and has low cost and high strength, so as to ensure the locking strength of the screw set. Meanwhile, the fixing block X1 has a larger contact area with the fixing rod. When the screw set locks the fixing block X1 on the inner side wall of the fixing rod, the stable connection between the corresponding support and the fixing rod can be ensured.

[0020] The screw set comprises two first screws (US1 / DS1) and one second screw (US2 / DS2). The second screw (US2 / DS2) is located between the two first screws (US1 / DS1). The fixing rod is provided with a positioning insertion hole P corresponding to the second screw (US2 / DS2). The second screw (US2 / DS2) is inserted into the positioning insertion hole P. The positioning insertion hole P is a light hole. Referring to Figure 3 , the fixing block X1 can move along the fixing rod under the guidance of the C-shaped through slot X. The positioning insertion hole P serves to assist in determining the installation position of the fixing block X1 and the support along the fixing rod when the fixing block X1 and the support are installed.

[0021] Corresponding to the upper left bracket 43L and the upper right bracket 43R are the first screw US1 and the second screw US2, and the upper left bracket 43L and the upper right bracket 43R are respectively provided with an arc-shaped hole UH1 and a circular hole UH2 corresponding to the first screw US1 and the second screw US2, the size of the arc-shaped hole UH1 is greater than the first screw US1, and the size of the circular hole UH2 is greater than the second screw US2, so that after the fixing of the screw group is released, the upper left bracket 43L can move along the left fixed rod 1L, and the upper right bracket 43R can move along the right fixed rod 1R. Corresponding to the lower left bracket 44L and the lower right bracket 44R are the first screw DS1 and the second screw DS2, and the lower left bracket 44L and the lower right bracket 44R are respectively provided with an arc-shaped hole DH1 and a circular hole DH2 corresponding to the first screw DS1 and the second screw DS2. The two arc-shaped holes (UH1 / DH1) on the bracket are mirror-symmetric about the circular hole (UH2 / DH2), and the second screw (US2 / DS2) is the rotation axis when the bracket rotates relative to the corresponding fixed rod.

[0022] After the fixing of the screw group is released, the upper left bracket 43L and the lower left bracket 44L can rotate relative to the left fixed rod 1L, the upper right bracket 43R and the lower right bracket 44R can rotate relative to the right fixed rod 1R, the upper left bracket 43L can move along the left fixed rod 1L, and the upper right bracket 43R can move along the right fixed rod 1R.

[0023] The upper transverse rod 41 is arranged along the width direction w of the back body, the upper left bracket 43L and the upper right bracket 43R are respectively fixedly connected with the upper transverse rod 41 through a locking mechanism, and after the locking mechanism is unlocked, the upper left bracket 43L and the upper right bracket 43R can move along the upper transverse rod 41. Referring to Figure 4 The upper left bracket 43L includes a first bracket block A and a second bracket block B, the first bracket block A is connected with the corresponding fixed rod through a screw group, and the upper transverse rod 41 is clamped between the first bracket block A and the second bracket block B. The locking mechanism includes two long screws C, the long screws C pass through the first bracket block A and are threadedly connected with the second bracket block B, so that the first bracket block A and the second bracket block B clamp the upper transverse rod 41, and the fixing between the upper left bracket 43L and the upper transverse rod 41 is realized. The upper right bracket 43R is mirror-symmetric with the upper left bracket 43L in structure. The lower transverse rod 42 is parallel to the upper transverse rod 41, and the lower left bracket 44L and the lower right bracket 44R are mirror-symmetric in structure and are respectively fixedly connected with the lower transverse rod 42.

[0024] The adjustment process of the back body will be described below. Figures 5 to 9 The adjustment process of the back body will be described below.

[0025] Figure 5 And 6 In the two fixed rods are located in the central position, and the rotation angle α is 0°. Figure 7 And 8 In the two fixed rods are located in the central position, and the rotation angle α is 0°.Figure 9 In the embodiment, the two fixed rods rotate about the corresponding second screw DS2, the left fixed rod 1L rotates to the right, and the rotation angle a is 4°; the right fixed rod 1R rotates to the left, and the rotation angle a is 4°. When the fixed rods rotate to the left or right from the central position, the positions of the lower left support 44L, the lower right support 44R, the lower cross rod 42, and the upper cross rod 41 remain unchanged; the upper right support 43R and the upper left support 43L move relative to the upper cross rod 41 in the left-right direction; the fixed rods rotate about the corresponding second screw DS2, causing the fixed block X1 at the upper part of the fixed rod to move downward relative to the corresponding upper support (referring to the upper right support 43R and the upper left support 43L), and the fixed rod rotates about the second screw US2 relative to the corresponding upper support.

[0026] The upper cross rod 41 is provided with a scale 411. Before rotating the fixed rods, loosen the binding system 3, and then loosen the corresponding screw set and the long screw C. Moving the upper support along the upper cross rod 41 can make the corresponding fixed rod rotate. According to the scale 411 on the upper cross rod 41, the adjustment amount can be grasped. After adjusting to the appropriate position, lock the screw set and the long screw C, and tighten the binding system 3. Embodiment Two

[0027] This embodiment provides a wheelchair, the structure of the wheelchair is as shown in Figure 1 The seat back system provided in Embodiment One is also included, as well as conventional mechanisms such as wheels and headrests.

[0028] Those skilled in the art can make modifications to the above embodiments without departing from the inventive concept of the present application, and the modified schemes should still fall within the protection scope of the present application. Modifications that can be made by those skilled in the art include but are not limited to:

[0029] (1) Change the structure of the rotation adjustment system. For example, remove the second nut and the corresponding circular hole; for example, the positioning hole P; for example, directly set a threaded hole on the fixed rod without the fixed block X1, and the screw set is directly locked to the fixed rod; for example, the rotation adjustment system includes four universal ball heads and corresponding locking mechanisms, and the universal ball heads are ball-jointed with the fixed rods. As long as the rotation adjustment system meets the following characteristics, it should be considered to fall within the protection scope of the present application: the rotation adjustment system is connected with the two fixed rods respectively, used to make the two fixed rods rotate and displace in the same plane, and the rotation angle a is an acute angle.

[0030] (2) Change the structure of the binding system. For example, use the binding system in patent document CN205073152U.

[0031] (3) Remove the lower cross rod, and the two lower supports (referring to the lower left support 44L and the lower right support 44R) are directly fixed to the wheelchair frame.

Claims

1. A seat back system, characterized by: The backrest body comprises two fixed rods, a left backrest sheet (2L), a right backrest sheet (2R) and a belt system (3), the two fixed rods are a left fixed rod (1L) and a right fixed rod (1R), the left side of the left backrest sheet (2L) is fixed on the left fixed rod (1L), the right side of the right backrest sheet (2R) is fixed on the right fixed rod (1R), the right side of the left backrest sheet (2L) and the left side of the right backrest sheet (2R) are connected through the belt system (3), the rotating adjusting system is connected with the two fixed rods respectively, and is used for rotating and shifting the two fixed rods in the same plane, and the rotating angle (α) is an acute angle; the rotating adjusting system comprises an upper horizontal rod (41), four supports, four screw groups and two locking mechanisms, the four supports are an upper left support (43L), an upper right support (43R), a lower left support (44L) and a lower right support (44R), the upper left support (43L) and the lower left support (44L) are fixedly connected with the left fixed rod (1L) through a screw group respectively, and the upper right support (43R) and the lower right support (44R) are fixedly connected with the right fixed rod (1R) through a screw group respectively; after the fixation of the screw group is released, the upper left support (43L) and the lower left support (44L) can rotate relative to the left fixed rod (1L), the upper right support (43R) and the lower right support (44R) can rotate relative to the right fixed rod (1R), the upper left support (43L) can move along the left fixed rod (1L), and the upper right support (43R) can move along the right fixed rod (1R); the upper horizontal rod (41) is arranged along the width direction (w) of the backrest body, the upper left support (43L) and the upper right support (43R) are fixedly connected with the upper horizontal rod (41) through a locking mechanism respectively, and the upper left support (43L) and the upper right support (43R) can move along the upper horizontal rod (41) after the locking mechanism is unlocked.

2. The seatback system of claim 1, wherein: The screw group comprises two first screws (US1 / DS1), each of the two first screws (US1 / DS1) is provided with two arc-shaped holes (UH1 / DH1) arranged oppositely on the corresponding support, the two first screws (US1 / DS1) are relatively displaced in the two arc-shaped holes (UH1 / DH1), the screw group passes through the arc-shaped holes (UH1 / DH1) of the support in sequence and is screwed to the fixed rod, and when the fixation of the screw group is released, the upper left support (43L) can move along the left fixed rod (1L), and the upper right support (43R) can move along the right fixed rod (1R).

3. The seatback system of claim 1, wherein: The fixed rod has a C-shaped through slot (X), and a fixed block (X1) is arranged in the C-shaped through slot (X). Two screw holes are arranged on each fixed block (X1) along the length direction. The screw set includes two first screws (US1 / DS1). Two arc-shaped holes (UH1 / DH1) are arranged on each support corresponding to the two first screws (US1 / DS1) in opposite positions. The two first screws (US1 / DS1) are relatively displaced in the two arc-shaped holes (UH1 / DH1). Four fixed blocks (X1) are connected with four screw sets respectively. The locking screw set increases the friction between the inner side of the fixed rod and the fixed block (X1) and the friction between the outer side of the fixed rod and the support, so that the support is fixedly connected with the corresponding fixed rod.

4. The seatback system of claim 3, wherein: The screw set further includes a second screw (US2 / DS2) located between the two first screws (US1 / DS1). A circular hole (UH2 / DH2) is arranged on the support corresponding to the second screw (US2 / DS2). The size of the circular hole (UH2) on the upper left support (43L) and the upper right support (43R) is greater than that of the corresponding second screw (US2). A screw hole is additionally arranged on the fixed block (X1) corresponding to the second screw (US2 / DS2), so that, after the fixing of the screw set is released, the upper left support (43L) can move along the left fixed rod (1L), and the upper right support (43R) can move along the right fixed rod (1R). A positioning insertion hole (P) is arranged on the groove bottom of the C-shaped through slot (X) corresponding to the middle screw hole of the fixed block (X1). The corresponding second screw (US2 / DS2) is inserted into the positioning insertion hole (P) after passing through the fixed block (X1), so as to realize the positioning of the corresponding fixed block (X1).

5. The seatback system of claim 1, wherein: The upper left support (43L) includes a first support block (A) and a second support block (B). The first support block (A) is connected with the corresponding fixed rod through the screw set. The upper cross rod (41) is clamped between the first support block (A) and the second support block (B). The locking mechanism includes two long screws (C). The long screws (C) pass through the first support block (A) and are threadedly connected with the second support block (B), so as to clamp the first support block (A) and the second support block (B) to the upper cross rod (41), thereby realizing the fixing between the upper left support (43L) and the upper cross rod (41). The upper right support (43R) is mirror-symmetrically arranged with the upper left support (43L).

6. The seatback system of claim 1, wherein: A scale (411) is arranged on the upper cross rod (41).

7. The seatback system of claim 1, wherein: The rotating adjustment system further includes a lower cross rod (42), a lower left support (44L) and a lower right support (44R) fixedly connected with the lower cross rod (42).

8. The seatback system of any one of claims 1 to 7, wherein: The binding belt system (3) includes a plurality of binding belts (31) and corresponding fixing buckles (32). The binding belts (31) are arranged along the width direction (w) of the back body. The plurality of binding belts (31) are arranged in the height direction (h) of the back body. The fixed ends of the binding belts (31) are fixed on the rear side of the right / left back piece. The fixing buckles (32) are correspondingly fixed on the rear side of the left / right back piece. The free ends of the binding belts (31) pass through the fixing buckles (32), and the fixing buckles (32) clamp and fix the binding belts (31).

9. A wheelchair characterized by: A seat back system as claimed in any one of claims 1 to 8. A seat back system as claimed in any one of claims 1 to 8.

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