Adjustable hard backrest for wheelchair

Abstract

The utility model aims to provide an adjustable hard backrest for a wheelchair, which comprises a universal headrest, a wheelchair supporting backrest body, a wheelchair back fixing and adjusting adapter and a wheelchair back cushion, the wheelchair supporting backrest body comprises two vertical adjusting vertical rods, and the adjusting vertical rods are connected with the universal headrest. The adjusting vertical rods are connected with a wheelchair backrest plate through wheelchair back fixing and adjusting adapters, each adjusting vertical rod is provided with two wheelchair back fixing and adjusting adapters, each wheelchair back fixing and adjusting adapter comprises a fixing buckle and a rotating buckle, the fixing buckles are connected with a fixing column, a cavity is formed in the center of the fixing column, and the rotating buckles are connected with the fixing column. A central cavity of the fixing column is internally provided with a threaded groove, a rotating thread is arranged in the threaded groove, a threaded rod is arranged in the threaded groove, and the other end of the threaded rod is provided with a threaded rod head protrusion. When a user moves or the wheelchair is subjected to external force, the wheelchair can be kept stable, and the toppling risk is reduced.

Description

Technical Field

[0001] This utility model relates to the field of wheelchair technology, and in particular to an adjustable hard backrest for wheelchairs. Background Technology

[0002] Wheelchairs are tools to help the elderly and disabled move and exercise. The production and manufacturing of wheelchairs have become increasingly mature and modular. The backrest is an important component of a wheelchair, which provides back support for the user, making it easier for the disabled and elderly to use their spine and achieve the goal of comfortable use.

[0003] Traditional wheelchair backrests use a fixed structure, which cannot be adapted to the installation of different manual and electric wheelchairs. In practical work, since disabled people have different heights, weights, and spinal positions, the wheelchair backrests need to be adjusted according to different people. To address this, our company has developed a backrest assembly. Our patented product can be adapted to more than 95% of the wheelchairs currently on the market. It achieves modular production of wheelchair backrests, and this wheelchair uses an adjustable hard backrest, which can achieve a tilt angle of up to 15°. Furthermore, by adjusting the thread length of the fixing column of the backrest assembly itself, it can be adapted to different wheelchair widths. This patented product has higher strength and a wider range of adjustment applications. Utility Model Content

[0004] This utility model provides an adjustable hard backrest for wheelchairs, with the backrest adjustable for forward and backward movement by 0-50mm and the tilt angle adjustable for forward and backward movement by 1-15°.

[0005] The adjustable hard backrest for a wheelchair comprises four components: a universal headrest, a wheelchair support backrest body, a wheelchair backrest fixing and adjustment adapter, and a wheelchair backrest cushion.

[0006] The versatile headrest has a two-layer structure: an inner rigid frame and an outer PU foam or sponge structure.

[0007] The universal headrest includes a headrest body, with a fixed base at the bottom. The fixed base is fixedly connected to the wheelchair backrest by screws. The upper part of the fixed base is a base support, and the upper part of the base support is connected to a universal adjustment component structure. The universal adjustment component structure includes a fixed crescent plate A and a fixed crescent plate B. Handles are respectively provided on fixed crescent plate A and fixed crescent plate B. Fixed crescent plate A is connected to the support column by fixing screws, and fixed crescent plate B is connected to the fixed seat on the headrest by fixing screws. There are a total of three fixing points. The three fixing points are locked and positioned by locking screws. Loosening the locking screws moves the three joints. The universal structure allows the joints on the headrest to be adjusted to any suitable position in terms of front-back, back-to-back, up-down and down angles.

[0008] The headrest is connected to the fixed crescent plate B via a fixed end. The headrest has an ergonomic and humanized design with a concave center and protrusions on both sides to fix the head in the middle. People of different body types can adjust the joint structure of the universal adjustable headrest to find a suitable headrest position.

[0009] The wheelchair support backrest body includes two vertical adjustment rods, which are connected to the wheelchair backrest panel via wheelchair backrest fixing adjustment adapters. The outer layer of the wheelchair backrest panel is covered with a rubber layer. There are four wheelchair backrest fixing adjustment adapters, with two adapters on each adjustment rod. The wheelchair backrest panel is made of aluminum alloy or engineering plastic material, and a strip-shaped hollow limiting groove is provided on the wheelchair backrest panel.

[0010] The hollow limiting slot is the invention feature of this utility model for an adjustable hard backrest for wheelchairs. The hollow limiting slot has an elliptical structure and adopts two modes: one is a horizontal long row of holes, and the other is a vertical long row of holes. The fixing buckle is set on the adjustment rod. By adjusting the position of the fixing buckle, the height of the wheelchair backrest can be adjusted. Alternatively, the height of the adjustable hard backrest can be adjusted by adjusting the wheelchair backrest fixing adjustment adapter.

[0011] The wheelchair backrest is also equipped with headrest adjustment holes. The universal headrest can be fixed by bolts passing through the headrest adjustment holes and the screw holes of the fixing base. The height of the universal headrest can be adjusted by adjusting the position of the universal headrest in the headrest adjustment holes.

[0012] The wheelchair backrest fixing and adjusting adapter includes a fixing buckle and a rotating buckle. The fixing buckle is connected to a fixing column. A cavity is provided at the center of the fixing column. A threaded groove is provided in the cavity at the center of the fixing column. A rotating thread is provided in the threaded groove. A threaded rod is provided in the threaded groove. A threaded rod head protrusion is provided at the other end of the threaded rod. The threaded rod head protrusion is connected to the fixing column connecting plate. The fixing column connecting plate has a fixing column connecting plate cavity. The threaded rod head protrusion is placed in the fixing column connecting plate cavity.

[0013] A slotted plate is provided on the fixed column connecting plate, and the fixed column connecting plate and the slotted plate make the threaded rod clamped.

[0014] The wheelchair backrest is equipped with a locking and fixing panel. Both the slot plate and the locking and fixing panel are fixed to the wheelchair backrest and locked by bolts, so that the locking and fixing panel makes the wheelchair backrest and the adjustment rod a whole.

[0015] The wheelchair backrest cushion is made of wear-resistant, high-resilience fabric or PU flame-retardant leather. The wheelchair backrest cushion is fixedly connected to the front of the wheelchair backrest panel, and the interior of the wheelchair backrest cushion has ventilation holes.

[0016] This utility model discloses a wheelchair backrest that uses a wheelchair backrest fixing and adjustment adapter to firmly connect the backrest panel and support frame to the support base plate. This ensures stability even when the user moves or the wheelchair is subjected to external forces, reducing the risk of tipping over. This utility model has a wide range of applications, adapting to wheelchair backrest widths of 380mm-520mm and backrest heights of 300mm-900mm. At the same time, the backrest fixing and adjustment adapter is easy to install and remove, realizing modular production and assembly of wheelchair backrests. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of an adjustable hard backrest for a wheelchair according to the present invention. Figure One ;

[0018] Figure 2 This is a schematic diagram of the overall structure of an adjustable hard backrest for a wheelchair according to the present invention. Figure Two ;

[0019] Figure 3 This is a schematic diagram of the headrest's main structure;

[0020] Figure 4 This is a schematic diagram of the wheelchair backrest fixing and adjusting adapter of this utility model;

[0021] Figure 5 This is a side view of an adjustable hard backrest for a wheelchair according to the present invention;

[0022] Figure 6 This is an enlarged view of the chair backrest adjustment adapter;

[0023] Figure 7 This is a schematic diagram of the threaded rod structure of the chair back fixing and adjusting adapter;

[0024] Figure 8 This is a schematic diagram showing the positions of the adjusting pole and the wheelchair backrest fixing adjustment adapter;

[0025] Figure 9 This is a schematic diagram of the vertical movement adjustment structure of the limit slot;

[0026] Figure 10 This is a schematic diagram of the lateral movement adjustment structure of the limit slot;

[0027] Figure 11 Schematic diagram of the connection structure between the fixed column and the threaded rod;

[0028] Figure 12 This is a schematic diagram of the connection structure between the threaded rod and the wheelchair backrest.

[0029] Figure 13 This is a schematic diagram of the locking and fixing panel and the connecting plate slot position structure. Figure One ;

[0030] Figure 14 This is a schematic diagram of the locking and fixing panel and the connecting plate slot position structure. Figure Two ;

[0031] Figure 15 This is a schematic diagram of the structure of the slot position of the fixed column connecting plate;

[0032] Figure 16 This is a schematic diagram of the threaded rod head protrusion locking position.

[0033] Explanation of key symbols:

[0034] 1_1 is the headrest body, 1_2 is the fixed base, 1_3 is the base support, 1_4 is the fixed crescent plate A, 1_5 is the fixed crescent plate B, 1_6 is the handle, 1_7 is the stop bolt, 1_8 is the headrest support plate, and 1_9 is the headrest adjustment hole.

[0035] 2_2 Adjustable upright, 2_3 Wheelchair backrest, 2_4 Limiting slot, 2_5 Rubber layer;

[0036] 3_1 Fixed buckle, 3_2 Rotary buckle, 3_3 Fixed post, 3_4 Threaded rod, 3_5 Locking fixed panel, 3_6 Fixed post connecting plate, 3_7 Connecting plate bolt hole, 3_8 Threaded groove, 3_9 Slot plate, 3_10 Fixed post connecting plate cavity;

[0037] 4_1 is the wheelchair backrest cushion, and 4_2 is the ventilation hole. Detailed Implementation

[0038] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0039] Example:

[0040] The adjustable hard backrest for a wheelchair comprises four components: a universal headrest, a wheelchair support backrest body, a wheelchair backrest fixing and adjustment adapter, and a wheelchair backrest cushion.

[0041] The versatile headrest has a two-layer structure: an inner rigid frame and an outer PU foam or sponge structure.

[0042] The universal headrest includes a headrest body 1_1, with a fixed base 1_2 at the bottom. The fixed base 1_2 is fixedly connected to the wheelchair backrest 2_3 by screws. The upper part of the fixed base is a base support, and the upper part of the base support is connected to a universal adjustment component structure. The universal adjustment component structure includes a fixed crescent plate A and a fixed crescent plate B. Handles are respectively provided on the fixed crescent plate A and the fixed crescent plate B. The fixed crescent plate A is connected to the support column by fixing screws, and the fixed crescent plate B is connected to the fixed seat on the headrest by fixing screws. There are a total of three fixing points. The three fixing points are locked and positioned by locking screws. The three joints can be moved by loosening the locking screws. The universal structure allows the joints on the headrest to be adjusted to any suitable position in terms of front-back, back-up, and down angles.

[0043] The headrest is connected to the fixed crescent plate B via a fixed end. The headrest has an ergonomic and humanized design with a concave center and protrusions on both sides to fix the head in the middle. People of different body types can adjust the joint structure of the universal adjustable headrest to find a suitable headrest position.

[0044] The wheelchair support backrest body includes two vertical adjustment rods 2_2. The adjustment rods 2_2 are connected to the wheelchair backrest panel via wheelchair backrest fixing adjustment adapters. The outer layer of the wheelchair backrest panel is covered with a rubber layer. There are four wheelchair backrest fixing adjustment adapters, with two wheelchair backrest fixing adjustment adapters on each adjustment rod 2_2. The wheelchair backrest panel is made of aluminum alloy or engineering plastic material, and a strip-shaped hollow limiting groove is provided on the wheelchair backrest panel.

[0045] The hollow limiting slot is the invention feature of this utility model for an adjustable hard backrest for wheelchairs. The hollow limiting slot has an elliptical structure and adopts two modes: one is a horizontal long row of holes, and the other is a vertical long row of holes. The fixing buckle is set on the adjustment rod. By adjusting the position of the fixing buckle, the height of the wheelchair backrest can be adjusted. Alternatively, the height of the adjustable hard backrest can be adjusted by adjusting the wheelchair backrest fixing adjustment adapter.

[0046] The wheelchair backrest is also equipped with headrest adjustment holes. The universal headrest can be fixed by bolts passing through the headrest adjustment holes and the screw holes of the fixing base. The height of the universal headrest can be adjusted by adjusting the position of the universal headrest in the headrest adjustment holes.

[0047] The wheelchair backrest fixing and adjusting adapter includes a fixing buckle 3_1 and a rotating buckle 3_2. The fixing buckle 3_1 is connected to a fixing post 3_3. A cavity is provided at the center of the fixing post 3_3. A threaded groove 3_8 is provided in the cavity at the center of the fixing post 3_3. A rotating thread is provided in the threaded groove 3_8. A threaded rod 3_4 is provided in the threaded groove. A threaded rod head protrusion is provided at the other end of the threaded rod 3_4. The threaded rod head protrusion is connected to the fixing post connecting plate. The fixing post connecting plate has a fixing post connecting plate cavity. The threaded rod head protrusion is placed in the fixing post connecting plate cavity.

[0048] A slotted plate 3_9 is provided on the fixed column connecting plate, and the fixed column connecting plate and the slotted plate 3_9 make the threaded rod clamped.

[0049] A locking and fixing panel 3_5 is provided on the wheelchair backrest 2_3. Both the slot plate and the locking and fixing panel 3_5 are fixed to the wheelchair backrest and locked by bolt structure, so that the locking and fixing panel 3_5 makes the wheelchair backrest and the adjustment rod a whole.

[0050] The wheelchair backrest cushion structure uses a wear-resistant, high-resilience fabric cover or a PU flame-retardant leather cover. The wheelchair backrest cushion 4_1 is fixedly connected to the front of the wheelchair backrest panel, and the interior of the wheelchair backrest cushion has ventilation holes 4_2.

[0051] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. An adjustable hard backrest for a wheelchair, characterized in that, The system comprises four components: a universal headrest, a wheelchair support backrest body, a wheelchair backrest fixing and adjustment adapter, and a wheelchair backrest cushion. The universal headrest has a two-layer structure: an inner rigid frame and an outer PU foam or sponge structure. The wheelchair support backrest body includes two vertical adjustment rods connected to the wheelchair backrest panel via the wheelchair backrest fixing and adjustment adapter. The outer layer of the wheelchair backrest panel is covered with a rubber layer. There are four wheelchair backrest fixing and adjustment adapters, with two adapters on each adjustment rod. The wheelchair backrest panel is made of aluminum alloy or engineering plastic material and features a strip-shaped hollow limiting groove. The wheelchair backrest cushion is made of wear-resistant, high-resilience fabric or PU flame-retardant leather fabric. The wheelchair backrest cushion is fixedly connected to the front of the wheelchair backrest panel, and the interior of the wheelchair backrest cushion has ventilation holes.

2. The adjustable hard backrest for a wheelchair according to claim 1, characterized in that: The universal headrest includes a headrest body, with a fixed base at the bottom. The fixed base is fixedly connected to the wheelchair backrest by screws. The upper part of the fixed base is a base support, and the upper part of the base support is connected to a universal adjustment component structure. The universal adjustment component structure includes a fixed crescent plate A and a fixed crescent plate B. Handles are respectively provided on the fixed crescent plate A and the fixed crescent plate B. The fixed crescent plate A is connected to the support column by fixing screws, and the fixed crescent plate B is connected to the fixed seat on the headrest by fixing screws, for a total of three fixing points. The headrest is fixed and positioned by locking screws at the three fixing points. The headrest is connected to the fixed crescent plate B through the fixed end. The middle part of the headrest is a concave part, and the two sides of the headrest are provided with headrest protrusions.

3. The adjustable hard backrest for a wheelchair according to claim 1, characterized in that: The hollow limiting slot has an elliptical structure and adopts two modes: one is a horizontal long row of holes, and the other is a vertical long row of holes. The fixing buckle is set on the adjusting rod.

4. The adjustable hard backrest for a wheelchair according to claim 1, characterized in that: The wheelchair backrest is also equipped with headrest adjustment holes. The universal headrest can be fixed by passing bolts through the headrest adjustment holes and the screw holes of the fixing base.

5. An adjustable hard backrest for a wheelchair according to claim 1, characterized in that, The wheelchair backrest fixing and adjusting adapter includes a fixing buckle and a rotating buckle. The fixing buckle is connected to a fixing column. A cavity is provided at the center of the fixing column. A threaded groove is provided in the cavity at the center of the fixing column. A rotating thread is provided in the threaded groove. A threaded rod is provided in the threaded groove. A threaded rod head protrusion is provided at the other end of the threaded rod. The threaded rod head protrusion is connected to the fixing column connecting plate. The fixing column connecting plate has a fixing column connecting plate cavity. The threaded rod head protrusion is placed in the fixing column connecting plate cavity.

6. An adjustable hard backrest for a wheelchair according to claim 5, characterized in that, A slotted plate is provided on the fixed column connecting plate, and the fixed column connecting plate and the slotted plate make the threaded rod clamped.

7. An adjustable hard backrest for a wheelchair according to claim 6, characterized in that, The wheelchair backrest is equipped with a locking and fixing panel. Both the slot plate and the locking and fixing panel are fixed to the wheelchair backrest and locked by bolts, so that the locking and fixing panel makes the wheelchair backrest and the adjustment rod a whole.

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