Seat backrest system and wheelchair

Abstract

The invention relates to a seat backrest system which comprises a backrest body and a rotation adjusting system, the backrest body comprises two fixing rods, a left backrest piece, a right backrest piece and a bandage system, the two fixing rods are the left fixing rod and the right fixing rod respectively, the left side of the left backrest piece is fixed to the left fixing rod, and the right side of the right backrest piece is fixed to the right fixing rod; the right side of the left backrest piece and the left side of the right backrest piece are connected through the bandage system, the rotation adjusting system is connected with the two fixing rods respectively and used for enabling the two fixing rods to rotate and shift in the same plane, and the rotation angle is an acute angle. And after the bandage system is loosened, the inclination of the left fixing rod and the right fixing rod can be adjusted by rotating the adjusting system, so that the backrest main body is inclined and is better matched with the back of the user, and the bandage system is tensioned after the inclination is adjusted. The invention also relates to a wheelchair comprising the seat back system.

Description

Technical Field

[0001] The present invention relates to a seat back system. The present invention also relates to a wheelchair. Background Art

[0002] The current wheelchair seat backs are all centered, with a symmetrical structure, and cannot be adjusted to tilt left or right. For users with centered backs, it can provide better support, but for users with crooked backs that cannot be centered, when the user sits in the wheelchair, the center line of the back intersects with the center line of the seat back, and the seat back cannot provide proper support for the user's back, affecting the user's riding experience. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a seat back system which can be used in a wheelchair to provide suitable support for a user with a crooked back.

[0004] In order to solve the above technical problems, the present invention provides a seat back system, including a backrest main body and a rotation adjustment system, the backrest main body includes two fixed rods, a left backrest piece, a right backrest piece and a strap system, the two fixed rods are a left fixed rod and a right fixed rod respectively, the left side of the left backrest piece is fixed on the left fixed rod, the right side of the right backrest piece is fixed on the right fixed rod, the right side of the left backrest piece and the left side of the right backrest piece are connected by the strap system, and the rotation adjustment system is connected to the two fixed rods respectively, and is used to make the two fixed rods rotate and displace in the same plane, and the rotation angle is an acute angle.

[0005] After loosening the strap system, you can adjust the inclination of the left and right fixed rods by rotating the adjustment system to tilt the backrest body to better match the user's back. After adjusting the inclination, tighten the strap system.

[0006] The present invention also provides a wheelchair, which comprises the seat back system. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Attached Figures 1 to 9 The seat back system of the first embodiment of the present invention is fully demonstrated, wherein: Figure 1 A three-dimensional view of a wheelchair; Figure 2 This is an exploded view of the seat back system; Figure 3 This is an exploded view of the backrest body; Figure 4 The exploded view of the upper left bracket, the upper right bracket and the upper crossbar; Figure 5 and 6 They are respectively a three-dimensional view and a front view of the seat back system when the backrest body is centered; Figure 7and 8 They are respectively a stereoscopic view and a front view of the seat back system when the backrest body is tilted to the right; Fig. 9 It is a front view of the seat back system when the left backrest piece is tilted to the right and the right backrest piece is tilted to the left. DETAILED DESCRIPTION

[0008] The present invention provides a backrest body that can be adjusted to tilt to the left or to tilt to the right ( Figure 8 ) seat back system, if necessary, the backrest body can also be adjusted to a trapezoidal structure ( Fig. 9 ). The seat back is designed to solve the back support problems of wheelchair users with crooked backs, but it can also be used in other seating products.

[0009] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments of the present invention. Embodiment 1

[0010] This embodiment provides a seat back system, which is installed on a wheelchair. Figure 1 The seat backrest system is mainly composed of a backrest body and a rotation adjustment system. The backrest body is mainly composed of a left fixed rod 1L, a right fixed rod 1R, a left backrest sheet 2L, a right backrest sheet 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-symmetrical in structure and are made of aluminum profiles. Figure 3 The fixing rod is not a solid rod body, and has a special-shaped through groove for mounting the backrest pieces (referring to the left backrest piece 2L and the right backrest piece 2R) at the front, and a C-shaped through groove X for mounting the fixing block X1 at the rear.

[0011] The left backrest sheet 2L and the right backrest sheet 2R are made of cloth, and the strap system 3 includes a plurality of straps 31 and corresponding fixing buckles 32. The straps 31 are arranged along the width direction w of the backrest body, and the plurality of straps 31 are arranged at intervals along the height direction h of the backrest body. The fixed ends of the straps 31 are sewn and fixed to the rear side of the right backrest sheet 2R, and the fixing buckles 32 are correspondingly fixed to the rear side of the left backrest sheet 2L through the cloth tape sewn on the left backrest sheet 2L. Figure 2 , 3 In , 5, and 7, the strap 31 does not pass through the fixing buckle 32. Figure 1 , 6 In , 8 and 9, the strap 31 passes through the fixing buckle 32, and after the strap 31 is straightened, the fixing buckle 32 is used to clamp and fix the strap 31.

[0012] The rotation adjustment system mainly includes four brackets, an upper crossbar 41, a lower crossbar 42, four screw groups and two locking mechanisms. The four brackets are respectively an upper left bracket 43L, an upper right bracket 43R, a lower left bracket 44L and a lower right bracket 44R. The upper left bracket 43L and the lower left bracket 44L are each fixedly connected to the fixed block X1 in the left fixed rod 1L through a screw group, and the upper right bracket 43R and the lower right bracket 44R are each fixedly connected to the fixed block X1 in the right fixed rod 1R through a screw group. The fixed block X1 is an iron piece with a plurality of screw holes. The bracket is a plastic piece. When the screw group is locked, the fixed block X1 and the corresponding bracket clamp the side wall of the corresponding fixed rod, so that 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 bracket are increased, so as to achieve the fixation between the bracket and the corresponding fixed rod. The reason for designing the fixing block X1 and the C-shaped through slot X is that the cost of aluminum profiles with light weight and high hardness is high, so the fixing rod is made of aluminum profiles with light weight and moderate hardness, which is not suitable for opening threaded holes, so it is impossible to fix the bracket and the fixing rod by directly threading the screw group with the fixing rod. By setting the fixing block X1, which is made of iron, has low cost and high strength, it can ensure the locking strength of the screw group screwed thereto. At the same time, there is a larger contact area between the fixing block X1 and the fixing rod. When the screw group locks the fixing block X1 on the inner wall of the fixing rod, it can ensure a stable connection between the corresponding bracket and the fixing rod.

[0013] The screw assembly includes two first screws (US1 / DS1) and one second screw (US2 / DS2), and the second screw (US2 / DS2) is located between the two first screws (US1 / DS1). A positioning hole P is provided on the fixing rod corresponding to the second screw (US2 / DS2), and the second screw (US2 / DS2) is inserted into the positioning hole P, and the positioning hole P is a light hole. Figure 3 The fixing block X1 can move along the fixing rod under the guidance of the C-shaped through slot X. The positioning socket P is used to assist in determining the installation position of the fixing block X1 and the bracket along the fixing rod when installing the fixing block X1 and the bracket.

[0014] The first screw US1 and the second screw US2 correspond to the upper left bracket 43L and the upper right bracket 43R. The upper left bracket 43L and the upper right bracket 43R are provided with an arc hole UH1 and a circular hole UH2 respectively corresponding to the first screw US1 and the second screw US2. The size of the arc hole UH1 is larger than the first screw US1, and the size of the circular hole UH2 is larger than the second screw US2, so that after 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. The first screw DS1 and the second screw DS2 correspond to the lower left bracket 44L and the lower right bracket 44R. The arc hole DH1 and the circular hole DH2 are provided respectively corresponding to the first screw DS1 and the second screw DS2 on the lower left bracket 44L and the lower right bracket 44R. The two arc holes (UH1 / DH1) on the bracket are mirror-symmetrical 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.

[0015] After releasing the screw group, 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.

[0016] The upper cross bar 41 is arranged along the width direction w of the backrest body, and the upper left bracket 43L and the upper right bracket 43R are fixedly connected to the upper cross bar 41 through a locking mechanism. After the locking mechanism is unlocked, the upper left bracket 43L and the upper right bracket 43R can move along the upper cross bar 41. 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 to the corresponding fixing rod through a screw group, and the upper cross bar 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 to the second bracket block B, so that the first bracket block A and the second bracket block B clamp the upper cross bar 41 to achieve the fixation between the upper left bracket 43L and the upper cross bar 41. The upper right bracket 43R is mirror-symmetrical with the upper left bracket 43L. The lower cross bar 42 is parallel to the upper cross bar 41, and the lower left bracket 44L and the lower right bracket 44R are mirror-symmetrical in structure and are fixedly connected to the lower cross bar 42 respectively.

[0017] Combine the following Figures 5 to 9 The adjustment process of the backrest body is described.

[0018] Figure 5 and 6 In the figure, both fixed rods are located in the center position and the rotation angle α is 0°. Figure 7 and 8 In the figure, the two fixing rods are tilted and rotated to the right with the corresponding second screws DS2 as axes, and the rotation angle α is 4°. Fig. 9 In the figure, the two fixing rods use the corresponding second screw DS2 as the axis, and the left fixing rod 1L tilts and rotates to the right, with a rotation angle α of 4°, and the right fixing rod 1R tilts and rotates to the left, with a rotation angle α of 4°. When the fixing rod tilts and rotates to the left or right from the center position, the positions of the lower left bracket 44L, the lower right bracket 44R, the lower cross bar 42, and the upper cross bar 41 remain unchanged; the upper right bracket 43R and the upper left bracket 43L move in the left-right direction relative to the upper cross bar 41; the fixing rod rotates with the corresponding second screw DS2 as the axis, causing the fixing block X1 on the upper part of the fixing rod to move downward relative to the corresponding upper bracket (referring to the upper right bracket 43R and the upper left bracket 43L), and the fixing rod rotates with the second screw US2 as the axis relative to the corresponding upper bracket.

[0019] The upper crossbar 41 is provided with a scale 411. Before rotating the fixed rod, first loosen the strap system 3, and then loosen the corresponding screw group and the long screw C. The upper bracket can be moved along the upper crossbar 41 to rotate the corresponding fixed rod. The adjustment amount can be mastered according to the scale 411 on the upper crossbar 41. After adjusting to a suitable position, the screw group and the long screw C are locked to tighten the strap system 3. Embodiment 2

[0020] This embodiment provides a wheelchair, the structure of which is as follows Figure 1 As shown, it includes the seat back system provided in the first embodiment, and also includes conventional mechanisms such as wheels and headrests.

[0021] Those skilled in the art may make changes to the above embodiments without departing from the inventive concept of the present invention, and the modified solutions shall still fall within the protection scope of the present invention. The changes that may be made by those skilled in the art include but are not limited to: (1) Change the structure of the rotation adjustment system. For example, the second nut and the corresponding circular hole are eliminated; for example, the positioning socket P; for example, a threaded hole is directly set on the fixed rod, and the fixing block X1 is not set, and the screw group is directly locked on 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-hinged with the fixed rods. As long as the rotation adjustment system meets the following characteristics, it should be considered to fall within the scope of protection of the present invention: the rotation adjustment system is connected to the two fixed rods respectively, and is used to make the two fixed rods rotate and displace in the same plane, and the rotation angle α is an acute angle.

[0022] (2) Changing the structure of the strap system. For example, adopting the strap system in patent document CN205073152U.

[0023] (3) The lower cross bar is removed, and the two lower brackets (referring to the lower left bracket 44L and the lower right bracket 44R) are directly fixed to the wheelchair frame.

Claims

1. A seat back system, characterized in that: The invention comprises a backrest body and a rotation adjustment system. The backrest body comprises two fixed rods, a left backrest piece (2L), a right backrest piece (2R) and a strap system (3). The two fixed rods are respectively a left fixed rod (1L) and a right fixed rod (1R). The left side of the left backrest piece (2L) is fixed to the left fixed rod (1L), and the right side of the right backrest piece (2R) is fixed to the right fixed rod (1R). The right side of the left backrest piece (2L) and the left side of the right backrest piece (2R) are connected via the strap system (3). The rotation adjustment system is respectively connected to the two fixed rods and is used to rotate and displace the two fixed rods in the same plane. The rotation angle (α) is an acute angle.

2. The seat back system according to claim 1, characterized in that: The rotation adjustment system comprises an upper crossbar (41), four brackets, four screw groups and two locking mechanisms. The four brackets are an upper left bracket (43L), an upper right bracket (43R), a lower left bracket (44L) and a lower right bracket (44R). The upper left bracket (43L) and the lower left bracket (44L) are each fixedly connected to a left fixed rod (1L) via a screw group, and the upper right bracket (43R) and the lower right bracket (44R) are each fixedly connected to a right fixed rod (1R) via a screw group. After the screw groups are released, the upper left bracket (43L) and the lower left bracket (44L) can be rotated. The upper right bracket (43R) and the lower right bracket (44R) can rotate relative to the left fixed rod (1L), 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); the upper cross bar (41) is arranged along the width direction (w) of the backrest body, the upper left bracket (43L) and the upper right bracket (43R) are each fixedly connected to the upper cross bar (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 cross bar (41).

3. The seat back system according to claim 2, characterized in that: The screw group comprises two first screws (US1 / DS1), and each bracket is provided with two arc-shaped holes (UH1 / DH1) arranged opposite to each other corresponding to the two first screws (US1 / DS1). The two first screws (US1 / DS1) are relatively displaced relative to the two arc-shaped holes (UH1 / DH1). The screw group passes through the arc-shaped holes (UH1 / DH1) of the bracket in sequence and is screwed to the fixing rod. When the fixing of the screw group is released, the upper left bracket (43L) can move along the left fixing rod (1L), and the upper right bracket (43R) can move along the right fixing rod (1R).

4. The seat back system according to claim 2, wherein: The fixing rod has a C-shaped through slot (X), a fixing block (X1) is arranged in the C-shaped through slot (X), and each fixing block (X1) is provided with two screw holes along the length direction; the screw group includes two first screws (US1 / DS1), and each bracket is provided with two arc holes (UH1 / DH1) arranged oppositely corresponding to the two first screws (US1 / DS1), and the two first screws (US1 / DS1) are relatively displaced relative to the two arc holes (UH1 / DH1); the four fixing blocks (X1) are respectively connected to the four screw groups, and 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 bracket are increased by locking the screw groups, so that the bracket is fixedly connected to the corresponding fixing rod.

5. The seat back system according to claim 4, characterized in that: The screw group also includes a second screw (US2 / DS2), and the second screw (US2 / DS2) is located between the two first screws (US1 / DS1); a circular hole (UH2 / DH2) is provided on the bracket corresponding to the second screw (US2 / DS2); the size of the circular hole (UH2) on the upper left bracket (43L) and the upper right bracket (43R) is larger than the corresponding second screw (US2); the fixing block (X1) is further provided with a screw connection hole on the second screw (US2 / DS2), so that after the fixing of the screw group is released, the upper left bracket (43L) can move along the left fixing rod (1L), and the upper right bracket (43R) can move along the right fixing rod (1R); a positioning hole (P) is provided at the bottom of the C-shaped through groove (X) corresponding to the position of the middle screw connection hole of a fixing block (X1), and the corresponding second screw (US2 / DS2) is inserted into the positioning hole (P) after passing through the fixing block (X1), so as to realize the positioning of the corresponding fixing block (X1).

6. The seat back system according to claim 2, wherein: The upper left bracket (43L) comprises a first bracket block (A) and a second bracket block (B), the first bracket block (A) is connected to a corresponding fixing rod via a screw group, and an upper cross bar (41) is clamped between the first bracket block (A) and the second bracket block (B); a locking mechanism comprises two long screws (C), the long screws (C) pass through the first bracket block (A) and are threadedly connected to the second bracket block (B), so that the first bracket block (A) and the second bracket block (B) clamp the upper cross bar (41), thereby achieving fixation between the upper left bracket (43L) and the upper cross bar (41); the upper right bracket (43R) and the upper left bracket (43L) are mirror-symmetrical in structure.

7. The seat back system of claim 2, wherein: The upper cross bar (41) is provided with a scale (411).

8. The seat back system of claim 2, wherein: The rotation adjustment system also includes a lower crossbar (42), and a lower left bracket (44L) and a lower right bracket (44R) are respectively fixedly connected to the lower crossbar (42).

9. The seat back system according to any one of claims 1 to 8, characterized in that: The strap system (3) comprises a plurality of straps (31) and corresponding fixing buckles (32); the straps (31) are arranged along the width direction (w) of the backrest body, and the plurality of straps (31) are arranged at intervals along the height direction (h) of the backrest body; the fixed end of the strap (31) is fixed to the rear side of the right / left backrest sheet, and the fixing buckle (32) is correspondingly fixed to the rear side of the left / right backrest sheet; the free end of the strap (31) passes through the fixing buckle (32), and the fixing buckle (32) clamps and fixes the strap (31).

10. A wheelchair, characterized in that: Comprising a seat back system as claimed in any one of claims 1 to 9.

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