A backrest turnover adjusting and limiting structure of a wheelchair

Abstract

The utility model discloses a kind of turnover adjustment limiting structure of wheelchair backrest, the front wall of the first backrest seat of the product has protrusion extending forward;Second backrest seat rear wall is provided with the long opening of axial open type, long opening gradually expands radially from inside to outside;Protrusion is inserted in long opening, there is the spacing gap of limiting space that can let second backrest seat can be relative to protrusion front and rear movable turnover between protrusion and the upper and lower wall in long opening, protrusion and the bottom wall in long opening are provided with movable connection anti-drop device;The structure of the product can let first backrest seat, second backrest seat movable connection anti-drop, also can let second backrest seat relative to first backrest seat front and rear turnover movable, still can limit the front and rear turnover angle of second backrest seat by protrusion and long opening cooperation;The protrusion of first backrest seat, the long opening wall body structure of second backrest seat is thick, limiting structure is firm, cannot burst;The specific connecting structure of movable connection anti-drop device is hidden in long opening, not exposed, beautiful etc.

Description

Technical Field

[0001] This utility model relates to wheelchair components, and more particularly to a tilting and adjusting limiting structure for a wheelchair backrest. Background Technology

[0002] Chinese Patent Publication No. CN221308638U discloses a wheelchair backrest tilting adjustment device, including a wheelchair backrest cushion, a backrest cushion fixing connector, a backrest frame fixing connector, and a wheelchair backrest frame. The rear middle of the wheelchair backrest cushion is fixedly connected to the backrest cushion fixing connector, and the wheelchair backrest cushion and the backrest cushion fixing connector move together. The backrest frame fixing connector is fixedly connected to the middle of the wheelchair backrest frame. The backrest cushion fixing connector and the backrest frame fixing connector are hinged together. The backrest cushion fixing connector tilts back and forth relative to the backrest frame fixing connector, thereby causing the wheelchair backrest cushion to tilt back and forth. A backrest cushion tilting limiting device is fixed on the backrest cushion fixing connector and / or the backrest frame fixing connector. The wheelchair backrest cushion tilts back and forth within the limited movement space of the backrest cushion tilting limiting device. The tilting adjustment angle of the wheelchair backrest cushion is 0 degrees to 60 degrees. The backrest cushion fixing connector includes a backrest cushion connecting plate and an upper rear bend assembly. The backrest cushion connecting plate and the upper rear bend assembly are integrally formed, and the upper rear bend assembly has a transverse rear axle through hole. The rear middle of the wheelchair backrest cushion is fixedly connected to the backrest cushion connecting plate with screws. The backrest frame fixing connector includes a backrest frame connector and an upper front bend assembly. The backrest frame connector and the upper front bend assembly are integrally formed, and the upper front bend assembly has a transverse front axle through hole. The backrest frame connector is fixedly connected to the middle of the wheelchair backrest frame. A shaft core is transversely passed through the rear axle through hole and the front axle through hole, so that the upper rear bend assembly and the upper front bend assembly are hinged together through the shaft core. The backrest cushion fixing connector flips based on the shaft core. A backrest cushion forward and backward flipping limiting device is fixed on the upper rear bend assembly and / or the upper front bend assembly. The upper rear bend assembly includes a left convex rear bend and a right convex rear bend, with a notch between them; both the left and right convex rear bends have a transverse rear axle through hole; the upper front bend assembly includes a left front limiting convex edge body, a right front limiting convex edge body, and a middle front convex bend, with the left and right sides of the middle front convex bend having a left front limiting convex edge body and a right front limiting convex edge body extending outwards; the middle front convex bend has a transverse front axle through hole; the middle front convex bend is embedded in the notch.The backrest cushion's forward and backward flipping limiting device includes an upper left protruding limiting stop, an upper right protruding limiting stop, a lower left protruding limiting stop, and a lower right protruding limiting stop; the upper left and upper right protruding limiting stops are integrally formed with their corresponding left and right protruding rear bends at the top front; the lower left and lower right protruding limiting stops are integrally formed with their corresponding left and right protruding rear bends at the bottom front; a left front limiting protrusion is disposed between the upper left and lower left protruding limiting stops, providing a left front limit between the upper left and lower left protruding limiting stops. The right front limiting protruding edge body has a movable space between the upper right protruding limiting stop and the lower right protruding limiting stop. The upper right protruding limiting stop and the lower right protruding limiting stop provide a movable space for the right front limiting protruding edge body. The upper left protruding limiting stop and the upper right protruding limiting stop abut against the top of the corresponding left front limiting protruding edge body and the right front limiting protruding edge body, which is the backrest cushion fixing connector and then flips off. The lower left protruding limiting stop and the lower right protruding limiting stop abut against the bottom of the corresponding left front limiting protruding edge body and the right front limiting protruding edge body, which is the backrest cushion fixing connector and then flips off.

[0003] The backrest cushion fixing connector and backrest frame fixing connector of the above product structure have corresponding rear axle through holes and front axle through holes. A shaft core is passed through the rear axle through holes and front axle through holes to form a hinge connection. An upper rear bend assembly and an upper front bend assembly are provided to fix the backrest cushion forward and backward flipping limit device. The exposed structure of the upper left protruding limit stop, upper right protruding limit stop, lower left protruding limit stop, and lower right protruding limit stop is not aesthetically pleasing. Furthermore, the upper left protruding limit stop, upper right protruding limit stop, lower left protruding limit stop, and lower right protruding limit stop are strip-shaped, not thick enough, and have poor stability and firmness. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a wheelchair backrest flip-adjustment and limiting structure with a reasonable structural design that facilitates flip-adjustment and limiting.

[0005] The solution to the above technical problem is as follows:

[0006] A wheelchair backrest tilting and adjusting limiting structure includes a first backrest seat and a second backrest seat. The front wall of the first backrest seat has a protrusion extending forward. The rear wall of the second backrest seat has an axially open long opening, which is also horizontally arranged and gradually expands radially from the inside to the outside. The protrusion is inserted into the long opening. A limiting space gap is reserved between the protrusion and the upper and lower walls of the long opening to allow the second backrest seat to tilt and move back and forth relative to the protrusion. A movable connection anti-detachment device is provided between the protrusion and the bottom wall of the long opening.

[0007] The beneficial effects of this utility model's wheelchair backrest tilting and adjusting limiting structure are as follows: This product structure allows the first and second backrest seats to be movably connected and prevent detachment, while also allowing the second backrest seat to tilt back and forth relative to the first backrest seat. Furthermore, the tilting angle of the second backrest seat is limited by the cooperation of the protrusion and the long opening. The protrusion of the first backrest seat and the wall structure of the long opening of the second backrest seat are thick, and the limiting structure is robust and will not burst. The specific connection structure of the movable connection anti-detachment device is hidden inside the long opening, not exposed, and aesthetically pleasing. This product structure is rationally designed, easy to assemble, and flexible in use. Attached Figure Description

[0008] Figure 1 , Figure 2 , Figure 3 This is a perspective view of the flip-adjustable limiting structure of this utility model applied to a wheelchair frame;

[0009] Figure 4 , Figure 5 This is a perspective view of the flip-adjustable limiting structure of the product of this utility model;

[0010] Figure 6 , Figure 7 , Figure 8 This is an exploded view of the flip-adjustable limiting structure of the present invention.

[0011] Figure 9 This is a side view of the flip-adjustable limiting structure of the present invention.

[0012] Figures 10-12 This is a perspective view of the flip-adjustable limiting structure of the product of this utility model;

[0013] Figures 13-15 This is an exploded view of the flip-adjustable limiting structure of the present invention.

[0014] First backrest seat 1, protrusion 11, horizontal long plate 11A, anti-slip arc long horizontal column 12, through hole 13, backrest rod 14, wheelchair backrest pad frame 15, second backrest seat 2, long opening 21, anti-slip arc long groove 22, limiting space gap 23, installation flat surface 24, elastic reset device 3, pressure spring 3A, spring shaft 31, torsion spring 32, movable connection anti-slip device 4, protrusion inside opening 401, horizontal bar 402, rod hole one 403, rod hole two 404, notch 405, anti-slip arc long horizontal column 41, anti-slip arc long groove 42, narrowing opening 43, spring hole one 101, spring hole two 201. Detailed Implementation

[0015] like Figures 1-15 As shown:

[0016] A wheelchair backrest tilting and adjustment limiting structure includes a first backrest seat 1 and a first backrest seat 2. The main technical improvement of this product is that: a protrusion 11 extends forward from the front wall of the first backrest seat 1; the rear wall of the first backrest seat 2 has an axially open elongated opening 21, which is also horizontally arranged and gradually expands radially from the inside to the outside; the protrusion 11 is inserted into the elongated opening 21, and a space is reserved between the protrusion 11 and the upper and lower walls of the elongated opening 21 to allow the first backrest seat 2 to tilt relative to the protrusion 11. The first backrest seat 1 and the second backrest seat 2 have a front-to-back tilting limit space gap 23. This gap 23 is a pre-reserved space between the upper and lower inner walls of the elongated opening 21 and the protrusion 11. The front-to-back tilting angle of the second backrest seat 2 is limited by the height of the gap 23. A movable connection anti-detachment device 4 is provided between the protrusion 11 and the inner bottom wall of the elongated opening 21. The first backrest seat 1 and the first backrest seat 2 are connected by this movable connection anti-detachment device 4, achieving both anti-detachment and movable connection. This product structure allows for the movable connection and anti-detachment of the first and second backrest seats, as well as the front-to-back tilting motion of the second backrest seat relative to the first backrest seat. The protrusion and the elongated opening limit the front-to-back tilting angle of the second backrest seat. The protrusion of the first backrest seat and the wall structure of the elongated opening of the second backrest seat are thick, and the limiting structure is robust and will not burst. This product has a reasonable structure, is easy to assemble, and is flexible in use. The movable connection anti-detachment device 4 is hidden inside the elongated opening 21 and will not pinch or injure the user's hand.

[0017] Preferably, the movable connection anti-detachment device 4 includes an inner protrusion 401, a crossbar 402, a first rod hole 403, a second rod hole 404, and a notch 405. The inner bottom wall of the long opening 21 extends and protrudes to connect the inner protrusion 401. The inner protrusion 401 is arranged horizontally and inserted into the notch 405. The inner protrusion 401 has a first rod hole 403 horizontally. The front end of the protrusion 11 has a second rod hole 404 horizontally. The first rod hole 403 and the second rod hole 404 are horizontally connected. The first rod hole 403 and the second rod hole 404 are connected together to the crossbar 402 for anti-detachment. The crossbar 402 is a screw assembly. The specific connection structure of the movable connection anti-detachment device 4 is hidden inside the long opening 21. This structure has a stable hinged connection, a firm connection, and a simple structure.

[0018] Preferably, the inner bottom wall of the elongated opening 21 extends and protrudes to connect with an inner protrusion 401; there are two protrusions 11, with a notch 405 formed between the two protrusions 11, and the inner protrusion 401 is sandwiched between the two protrusions 11. The width of the notch 405 is approximately the same as the width of the inner protrusion 401; the above structure provides a more stable and tighter connection, without being too loose.

[0019] Preferably, the inner protrusion 401 of the opening is cylindrical; the inner bottom wall of the long opening 21 is arc-shaped; and the front end of the protrusion 11 is arc-shaped. This makes the flipping movement smoother.

[0020] Further: In another structure, the movable connection anti-detachment device 4 includes an anti-detachment arc-shaped long horizontal column 41, an anti-detachment arc-shaped long groove 42, and a narrowing opening 43; the front end of the protrusion 11 extends with the anti-detachment arc-shaped long horizontal column 41; the inner bottom of the long opening 21 is axially provided with an anti-detachment arc-shaped long groove 42; the height of the narrowing opening 43 is less than the diameter of the anti-detachment arc-shaped long horizontal column 41 for anti-detachment connection; the anti-detachment arc-shaped long horizontal column 41 is embedded in the anti-detachment arc-shaped long groove 42, and the two fit perfectly; the end of the protrusion 11 is located at the narrowing opening 43; at least a limiting space gap 23 is reserved between the protrusion 11 and the inner wall of the long opening 21 to allow the second backrest seat to rotate back and forth relative to the first backrest seat; the back and forth rotation angle of the second backrest seat 2 is limited by the limiting space gap 23. The above structure is easy to set up and assemble, has good anti-detachment ability, simple structure, and low cost.

[0021] Furthermore: The protrusion 11 is a horizontal long plate 11A, which mainly increases the connection area and makes it more stable to use; a limiting space gap 23 is formed between the plate surface of the horizontal long plate 11A and the wall surface of the long opening 21, and the upper top surface and lower bottom surface of the horizontal long plate 11A abut against the upper top wall and lower bottom wall of the corresponding long opening 21 to form a pulling limit, which limits the front and rear flipping angle of the second backrest 2.

[0022] When the second backrest seat 2 is flipped backward relative to the first backrest seat 1, the upper top wall of the long opening 21 and the upper top surface of the horizontal plate 11A press against each other to limit the backward flipping angle of the second backrest seat 2; when the second backrest seat 2 is flipped forward relative to the first backrest seat 1, the lower bottom wall of the long opening 21 and the lower bottom surface of the horizontal plate 11A press against each other to limit the forward turning angle of the second backrest seat 2. Thus, the forward and backward flipping angle of the second backrest seat 2 can be adjusted and the flipping angle can be limited. The above structure increases the contact area between the second backrest seat 2 and the first backrest seat 1, improves the stability of the movable connection, ensures stable flipping, provides good limiting effect, is not easily damaged, and has a robust structure.

[0023] Further: The front and rear flip angle is between 0 degrees and 45 degrees, and the second backrest 2 can rotate relative to the first backrest 1 between 0 degrees and 45 degrees; a suitable flip angle range for the second backrest 2 is set; preferably: the front and rear flip angle is between 0 degrees and 30 degrees, which is suitable for most uses and has better stability.

[0024] Furthermore: the space of the long opening 21 is trapezoidal; the horizontal plate 11A is trapezoidal, with a suitable shape and a solid structure.

[0025] Furthermore: The first backrest seat 1 has a vertical through hole 13 for threading and mounting the backrest rod 14 of the wheelchair; the first backrest seat 1 is integrally injection molded, which is easy and efficient to produce; the front wall of the second backrest seat 2 has a mounting flat surface 24 for connecting with the back of the wheelchair backrest pad frame 15 and for easy screw tightening, increasing the connection area; the second backrest seat 2 is integrally injection molded, which is easy and efficient to produce.

[0026] Furthermore, an elastic reset device 3 connects the first backrest seat 1 and the second backrest seat 2. The second backrest seat 2 automatically resets relative to the first backrest seat 1 via the elastic reset device 3. When the person is not leaning against the wheelchair backrest cushion frame 15, the elastic reset device 3 always returns the second backrest seat 2 and the wheelchair backrest cushion frame 15 to their initial state, resulting in a neat and aesthetically pleasing appearance. The wheelchair backrest cushion frame 15 is used to install the backrest cushion.

[0027] Furthermore: The elastic reset device 3 is a pressure spring 3A. The pressure spring 3A is pressed and connected between the first backrest 1 and the second backrest 2. One end of the pressure spring 3A is fixedly connected to the rear wall of the second backrest 2 with a screw, and the other end is fixedly connected to the front wall of the first backrest 1 with a screw. Choosing a suitable elastic reset structure results in low cost and good reset effect.

[0028] Preferably, a spring hole 101 is provided at the bottom of the front wall of the first backrest seat 1, and a spring hole 201 is provided at the bottom of the rear wall of the second backrest seat 2. A pressure spring 3A is installed and fixed between the spring hole 101 and the spring hole 201.

[0029] Further: The elastic reset device 3 includes a spring shaft 31 and a torsion spring 32. The spring shaft 31 is horizontally and fixedly connected to the anti-detachment arc-shaped long horizontal column 41. The spring shaft 31 and the anti-detachment arc-shaped long horizontal column 41 are integrally injection molded or fixed by a threaded structure. The outer end of the spring shaft 31 is fixedly connected to the torsion spring 32. One end of the torsion spring 32 is elastically pressed and fixedly connected to the rear wall of the second backrest seat 2, and the other end is elastically pressed and fixedly connected to the root of the protrusion 11. At the same time, the first backrest seat 1 and the second backrest seat 2 are fixedly connected by the torsion spring 32 to prevent detachment. Choosing a suitable reset structure results in low cost and good reset effect.

[0030] The second backrest 2 is prevented from slipping out to the left or right by the spring shaft 31 and torsion spring 32 structure, thus improving the anti-slip capability.

Claims

1. A tilting and adjusting limiting structure for a wheelchair backrest, comprising a first backrest seat and a second backrest seat, characterized in that: The first backrest has a protrusion extending forward from its front wall; the second backrest has an axially open long opening on its rear wall, which is also horizontally oriented and gradually expands radially from the inside out; the protrusion is inserted into the long opening, and a limiting space gap is reserved between the protrusion and the upper and lower walls of the long opening to allow the second backrest to move and rotate relative to the protrusion; a movable connection anti-detachment device is provided between the protrusion and the bottom wall of the long opening.

2. The wheelchair backrest tilting and adjusting limiting structure according to claim 1, characterized in that: The movable connection anti-detachment device includes an inner protrusion, a crossbar, a first rod hole, a second rod hole, and a notch. The inner bottom wall of the long opening extends and protrudes to connect with the inner protrusion. The inner protrusion is inserted into the notch. The inner protrusion has a first rod hole opened laterally, and the front end of the protrusion has a second rod hole opened laterally. The first rod hole and the second rod hole are horizontally connected. The first rod hole and the second rod hole are connected together to the crossbar for anti-detachment.

3. The wheelchair backrest tilting and adjusting limiting structure according to claim 2, characterized in that: The inner bottom wall of the long opening extends and protrudes to connect with an inner protrusion; there are two protrusions, and a notch is formed between the two protrusions, with the inner protrusion sandwiched between the two protrusions.

4. The wheelchair backrest tilting and adjusting limiting structure according to claim 3, characterized in that: The inner protrusion of the opening is cylindrical; the inner bottom wall of the long opening is arc-shaped; the front end of the protrusion is arc-shaped.

5. The wheelchair backrest tilting and adjusting limiting structure according to claim 1, characterized in that: The movable connection anti-detachment device includes an anti-detachment arc-shaped long horizontal column, an anti-detachment arc-shaped long groove, and a narrowing opening; the front end of the protrusion extends with an anti-detachment arc-shaped long horizontal column; the inner bottom of the long opening is axially provided with an anti-detachment arc-shaped long groove; the height of the narrowing opening is less than the diameter of the anti-detachment arc-shaped long horizontal column; the anti-detachment arc-shaped long horizontal column is embedded in the anti-detachment arc-shaped long groove, the end of the protrusion is located at the narrowing opening, and at least a limiting space gap is reserved between the protrusion and the inner wall of the long opening to allow the second backrest seat to rotate back and forth relative to the first backrest seat, and the back and forth rotation angle of the second backrest seat is limited by the limiting space gap.

6. The wheelchair backrest tilting and adjusting limiting structure according to claim 5, characterized in that: The protrusion is a horizontal plate. A limiting space gap is formed between the plate surface and the wall surface of the long opening. The top and bottom surfaces of the horizontal plate abut against the top and bottom walls of the corresponding long opening to form a pulling limit, which limits the front and rear flip angle of the second backrest.

7. The wheelchair backrest tilting and adjusting limiting structure according to claim 6, characterized in that: The long opening has a trapezoidal shape; the horizontal plate has a trapezoidal shape.

8. A wheelchair backrest tilting and adjusting limiting structure according to claims 1 to 7, characterized in that: An elastic reset device is connected between the first backrest and the second backrest, and the second backrest automatically resets relative to the first backrest through the elastic reset device.

9. The wheelchair backrest tilting and adjusting limiting structure according to claim 8, characterized in that: The elastic reset device is a pressure spring. A pressure spring is connected between the first backrest and the second backrest. One end of the pressure spring is fixedly connected to the rear wall of the second backrest and the other end is fixedly connected to the front wall of the first backrest.

10. A wheelchair backrest tilting and adjusting limiting structure according to claims 1 to 7, characterized in that: The forward and backward flipping angle is between 0 degrees and 45 degrees.

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