Left and right folding wheelchair backrest adjusting structure

Abstract

The utility model discloses left and right folding wheelchair backrest adjusting structure, including frame and backrest frame, the top both ends of frame all are provided with the clamping tooth disc, the bottom both ends of backrest frame all are provided with the clamping assembly of rotation connection with clamping tooth disc, be provided with the clamping tooth engagement disc of cooperation with clamping tooth disc in the clamping assembly, be provided with the adjusting spring between clamping tooth engagement disc and clamping tooth disc, be provided with the unlocking support of swing joint with backrest frame between clamping tooth engagement disc and clamping assembly, the outside of backrest frame is provided with the sliding sleeve of swing joint with unlocking support, is used for the spacing adjustment of backrest different angle, clamping tooth disc and clamping assembly coaxial arrangement, one end of unlocking support near backrest frame is provided with connecting shaft, is seted up on backrest frame and is slid with the sliding slot of connecting shaft, and connecting shaft and backrest frame are through. This backrest adjusting structure has angle adjusting structure, can be used to the spacing of backrest different angle.

Description

Technical Field

[0001] This utility model relates to a wheelchair backrest structure, and in particular to a left-right folding wheelchair backrest adjustment structure. Background Technology

[0002] In modern life, wheelchairs are an important mobility aid for people with mobility impairments, and their design rationality and functionality have a crucial impact on the user's quality of life. To facilitate use in different scenarios, wheelchairs are designed with a left-right folding structure. Through the use of hinges, linkages, and other mechanical structures on both sides of the wheelchair, it folds inward, effectively reducing the overall footprint of the wheelchair. This makes it easy to store and carry, allowing it to be easily placed in a car trunk or other confined spaces. Without compromising the overall strength and stability of the wheelchair, this design ensures ease of operation for the user during the folding and unfolding process.

[0003] Currently, the backrest structure of left-right folding wheelchairs uses a connecting shaft on the support frame in the backrest area to facilitate folding. This shaft connects to the backrest frame, allowing the backrest to rotate backward and fold away. However, this type of backrest structure lacks adjustable angle settings, making it difficult for users to find the most comfortable posture. Therefore, it is necessary to design a backrest adjustment structure with adjustable angle settings. Utility Model Content

[0004] In view of the above-mentioned problems in the existing technology, the purpose of this utility model is to provide a left-right folding wheelchair backrest adjustment structure, which realizes that the backrest adjustment structure has an angle adjustment structure and can be used for different angle limit applications.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] The left-right folding wheelchair backrest adjustment structure includes a frame and a backrest frame. Both ends of the top of the frame are provided with a toothed disc, and both ends of the bottom of the backrest frame are provided with a locking assembly that is rotatably connected to the toothed disc.

[0007] The snap-fit ​​assembly includes a snap-fit ​​engagement disc that works in conjunction with the snap-fit ​​disc. An adjusting spring is provided between the snap-fit ​​engagement disc and the snap-fit ​​disc. An unlocking bracket that is movably connected to the backrest frame is provided between the snap-fit ​​engagement disc and the snap-fit ​​assembly. A sliding sleeve that is movably connected to the unlocking bracket is fitted on the outside of the backrest frame for limiting and adjusting the backrest at different angles.

[0008] Preferably, the toothed disc and the locking assembly are coaxially arranged, the locking assembly is fixedly connected to the backrest frame, and the backrest frame rotates around the toothed disc.

[0009] Preferably, the toothed engagement disc has several tooth blocks on one side near the toothed disc, and the adjusting spring is located inside the several tooth blocks. The several tooth blocks are separated from the toothed disc by lifting the unlocking bracket, which is used for adjusting the angle of the backrest frame.

[0010] Preferably, the toothed engagement disc has a protrusion on the side near the engagement assembly, and the unlocking bracket has a protrusion at the end near the toothed engagement disc. The protrusion cooperates with the protrusion for limiting and adjusting the angle of the backrest frame.

[0011] Preferably, the locking assembly has a connecting shaft in the middle that passes through the adjusting spring and the locking tooth engagement disc, and multiple slots are provided on the outer side of the connecting shaft. The locking tooth engagement disc has a number of locking blocks in the middle that are the same as the number of slots. The locking tooth engagement disc is slidably locked with the connecting shaft through the locking blocks.

[0012] Preferably, the unlocking bracket has a through shaft at one end near the backrest frame, and the backrest frame has a sliding groove for the through shaft to slide into, and the through shaft passes through the backrest frame.

[0013] Preferably, a connecting spring is sleeved on the outside of the backrest frame, with both ends of the connecting spring connected to the snap-fit ​​assembly and the sliding sleeve respectively, and the connecting spring is spirally sleeved on the outside of the backrest frame.

[0014] Preferably, the sliding sleeve is provided with a spring buckle, and the backrest frame is provided with a slot. The spring buckle passes through the slot and is connected to the backrest frame for the sliding sleeve to return to its original position.

[0015] Compared with existing technologies, the backrest adjustment structure provided by this utility model has an angle adjustment structure to meet diverse usage needs. Specifically, the toothed disc on the frame and the locking assembly on the backrest frame allow the toothed disc to connect with the teeth of the toothed engagement disc in the locking assembly. Furthermore, the elastic connection between the toothed engagement discs facilitates tight engagement between the toothed engagement disc and the toothed engagement disc when the unlocking bracket presses against it, thus locking the backrest frame at different angles and allowing for convenient use of the backrest structure at different angles.

[0016] Furthermore, when the backrest angle needs to be adjusted, the sliding sleeve drives the unlocking bracket to slide upward, which allows the unlocking bracket to release the protrusion. The adjusting spring then resets, causing the locking tooth engagement plate to separate from the locking tooth plate, making it convenient for the backrest frame to rotate around the connecting shaft. This allows for flexible adjustment of the backrest angle, increasing the user's comfort when sitting, which is very beneficial for users sitting for long periods of time.

[0017] It should be understood that the general descriptions and details herein are exemplary and illustrative only and are not intended to limit this disclosure.

[0018] This application provides an overview of various implementations or exemplary embodiments of the technology described in this disclosure, and is not a full disclosure of the entire scope or all features of the disclosed technology. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the backrest adjustment structure of this utility model;

[0020] Figure 2 This is an exploded view of the toothed disc and locking assembly in the backrest adjustment structure of this utility model.

[0021] Figure 3 This is a partial structural cross-sectional view of the toothed disc and the locking assembly in the backrest adjustment structure of this utility model.

[0022] Figure 4 This is a partial structural diagram of the toothed disc and the toothed engagement disc in the backrest adjustment structure of this utility model.

[0023] Figure 5 This is a schematic diagram of the locking tooth engagement disc and unlocking bracket in the backrest adjustment structure of this utility model;

[0024] Figure 6 This is a partial structural cross-sectional view of the snap-fit ​​component and the snap-fit ​​tooth engagement disc in the backrest adjustment structure of this utility model.

[0025] Key reference numerals:

[0026] 1. Frame; 2. Backrest frame; 3. Gear plate; 4. Snap-fit ​​assembly; 6. Connecting shaft; 7. Adjusting spring; 8. Slot; 9. Gear engagement plate; 10. Locking block; 11. Protrusion; 12. Unlocking bracket; 13. Raised part; 14. Through shaft; 15. Sliding sleeve; 16. Connecting spring; 17. Gear block; 18. Sliding groove; 19. Spring buckle. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the embodiments of this disclosure will be described in more detail below with reference to the accompanying drawings. Note: The described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0028] As attached Figure 1 To be continued Figure 6 As shown, the backrest adjustment structure provided in the embodiment of this utility model is a backrest structure currently used in wheelchairs, including a frame 1 and a backrest frame 2. The frame 1 and the backrest frame 2 are connected to each other to form the backrest of the wheelchair, providing support for the back of the passenger. To facilitate the use of the backrest structure at different angles, locking discs 3 can be installed at both ends of the top of the frame 1, and locking components 4 can be installed at both ends of the bottom of the backrest frame 2. The locking components 4 are positioned opposite to the locking discs 3 and are rotatably connected to them. Through the locking engagement discs 9 provided in the locking components 4, the locking engagement discs 9 can engage with the locking discs 3 to limit the use angle of the backrest frame 2. An adjusting spring 7 is then installed between the locking engagement discs 9 and 3 to elastically connect the locking discs 3 and 9. When the adjusting spring 7 compresses the locking discs 3, it can engage the locking discs 9 and 3, locking the use angle of the locking discs 9. When the compression force is released, the adjusting spring 7 can drive the locking discs. The engagement disc 9 and the toothed disc 3 are released, facilitating the angle adjustment of the engagement disc 9 and the backrest frame 2. Next, an unlocking bracket 12 can be set between the engagement disc 9 and the locking assembly 4. The unlocking bracket 12 can be limited and unlocked by sliding up and down, pressing, or rotating. In some embodiments, the up and down sliding unlocking method is used. The unlocking bracket 12 can be movably connected to the backrest frame 2. A sliding sleeve 15 is movably fitted on the outside of the backrest frame 2 and connected to the unlocking bracket 12. This allows the user to slide the unlocking bracket 12 upward by sliding the sliding sleeve 15, thereby unlocking the engagement disc 9 and the toothed disc 3. This provides favorable conditions for the user to limit and adjust the backrest structure at different angles.

[0029] like Figure 2 As shown, the toothed disc 3 and the snap-fit ​​assembly 4 can be coaxially arranged, and the snap-fit ​​assembly 4 can be fixedly connected to the backrest frame 2. The same bolt is inserted through the center of the toothed disc 3 and the snap-fit ​​assembly 4, and then a nut is inserted into the outside of the bolt and tightened to limit the connection between the toothed disc 3 and the snap-fit ​​assembly 4. The snap-fit ​​assembly 4 can rotate at an angle, so that the backrest frame 2 can rotate around the toothed disc 3, which provides favorable conditions for the angle adjustment of the backrest structure.

[0030] Secondly, to facilitate use of the backrest at different angles, such as Figure 3 and 4As shown, in some embodiments, a plurality of tooth blocks 17 can be arranged on the side of the tooth engagement disc 9 near the tooth disc 3. The plurality of tooth blocks 17 are distributed opposite to the tooth disc 3. The adjusting spring 7 is located inside the plurality of tooth blocks 17. When the backrest structure is adjusted at an angle, the sliding sleeve 15 can be used to slide upward, thereby lifting the unlocking bracket 12 upward and releasing the tooth engagement disc 9. The plurality of tooth blocks 17 are separated from the tooth disc 3 by the adjusting spring 7 for the angle adjustment of the backrest frame 2.

[0031] Next, as Figure 3 and 5 As shown, in order to achieve the backrest structure's support function at different angles, in some embodiments, a limiting structure can be set between the toothed engagement disc 9 and the toothed disc 3. By setting a protrusion 11 on the side of the toothed engagement disc 9 near the engagement component 4, and setting a protrusion 13 on the end of the unlocking bracket 12 near the toothed engagement disc 9, the protrusion 13 can be used in conjunction with the protrusion 11. The protrusion 13 is located outside the protrusion 11. When the backrest is limited, the protrusion 13 on the unlocking bracket 12 can press against the protrusion 11, squeezing the toothed engagement disc 9 against the toothed disc 3. Several toothed blocks 17 engage with the toothed disc 3, realizing the limiting and angle adjustment of the backrest frame 2, and increasing the convenience of backrest angle adjustment.

[0032] It is worth noting that, in order to enable the rotation of the locking assembly 4 and the toothed disc 3, in addition, such as Figure 5 and 6 As shown, in some embodiments, a connecting shaft 6 can be provided in the middle of the snap-fit ​​assembly 4, and the connecting shaft 6 can pass through the adjusting spring 7 and the snap-fit ​​tooth engagement disc 9. Then, multiple slots 8 are opened on the outside of the connecting shaft 6, and the snap-fit ​​tooth engagement disc 9 is provided in the middle with the same number of snap blocks 10 as the slots 8. This makes it convenient for the snap-fit ​​tooth engagement disc 9 to use multiple snap blocks 10 to first snap onto the outside of the connecting shaft 6, and then the adjusting spring 7 pulls the snap-fit ​​tooth engagement disc 9 to connect with the snap-fit ​​assembly 4, so that the snap-fit ​​tooth engagement disc 9 can slide on the connecting shaft 6. Through the connection between the snap-fit ​​tooth engagement disc 9 and the snap-fit ​​assembly 4, the snap-fit ​​accuracy between the snap-fit ​​tooth engagement disc 9 and the snap-fit ​​tooth disc 3 is increased.

[0033] Furthermore, such as Figure 5 As shown, in order to facilitate the connection between the unlocking bracket 12 and the backrest frame 2, in some embodiments, a through shaft 14 can be provided at one end of the unlocking bracket 12 near the backrest frame 2, and a sliding groove 18 is provided on the backrest frame 2 for the through shaft 14 to slide. The unlocking bracket 12 passes through the backrest frame 2 via the through shaft 14, which facilitates the sliding connection between the unlocking bracket 12 and the backrest frame 2 and provides favorable conditions for unlocking the backrest structure.

[0034] Next, a connecting spring 16 can be fitted onto the outside of the backrest frame 2. The two ends of the connecting spring 16 are connected to the snap-fit ​​assembly 4 and the sliding sleeve 15, respectively. The sliding sleeve 15 can be made of plastic material and is elastically set on the backrest frame 2. The connecting spring 16 is spirally fitted onto the outside of the backrest frame 2 to limit the sliding range of the sliding sleeve 15, increase the connection stability between the sliding sleeve 15 and the backrest frame 2, and increase the ease of unlocking the backrest structure.

[0035] Furthermore, such as Figure 2 As shown, in some embodiments, a spring buckle 19 can be provided on the outside of the sliding sleeve 15. The spring buckle 19 elastically presses against the backrest frame 2, and then a slot is opened on the backrest frame 2. When the sliding sleeve 15 is in contact with the snap-fit ​​assembly 4, the spring buckle 19 can pass through the slot and connect with the backrest frame 2. By pulling the sliding sleeve 15 upward, the spring buckle 19 can be squeezed to separate from the slot, and the sliding sleeve 15 can be moved, providing favorable conditions for the angle rotation of the backrest frame 2 and facilitating the return of the sliding sleeve 15.

[0036] Of course, the above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications are also considered to be within the protection scope of this utility model.

Claims

1. A left-right folding wheelchair backrest adjustment structure, comprising a frame (1) and a backrest frame (2), characterized in that: Both ends of the top of the frame (1) are provided with toothed discs (3), and both ends of the bottom of the backrest frame (2) are provided with snap-fit ​​components (4) that are rotatably connected to the toothed discs (3). The snap-fit ​​assembly (4) is provided with a snap-fit ​​engagement disc (9) that works with the snap-fit ​​disc (3). An adjusting spring (7) is provided between the snap-fit ​​engagement disc (9) and the snap-fit ​​disc (3). An unlocking bracket (12) that is movably connected to the backrest frame (2) is provided between the snap-fit ​​engagement disc (9) and the snap-fit ​​assembly (4). A sliding sleeve (15) that is movably connected to the unlocking bracket (12) is provided on the outside of the backrest frame (2) for limiting and adjusting the backrest at different angles.

2. The backrest adjustment structure as described in claim 1, characterized in that, The toothed disc (3) and the snap-fit ​​assembly (4) are coaxially arranged. The snap-fit ​​assembly (4) is fixedly connected to the backrest frame (2). The backrest frame (2) rotates around the toothed disc (3).

3. The backrest adjustment structure as described in claim 1, characterized in that, The toothed engagement disc (9) has several tooth blocks (17) on one side near the toothed disc (3). The adjusting spring (7) is located inside the several tooth blocks (17). The several tooth blocks (17) are separated from the toothed disc (3) by the lifting of the unlocking bracket (12) for the angle adjustment of the backrest frame (2).

4. The backrest adjustment structure as described in claim 3, characterized in that, The tooth engagement disc (9) has a protrusion (11) on one side near the engagement assembly (4), and the unlocking bracket (12) has a protrusion (13) at one end near the tooth engagement disc (9). The protrusion (13) cooperates with the protrusion (11) for limiting and adjusting the angle of the backrest frame (2).

5. The backrest adjustment structure as described in claim 3, characterized in that, The middle part of the snap-fit ​​assembly (4) is provided with a connecting shaft (6) that passes through the adjusting spring (7) and the snap-fit ​​disc (9). Multiple slots (8) are provided on the outer side of the connecting shaft (6). The middle part of the snap-fit ​​disc (9) is provided with a number of snap blocks (10) equal to the number of slots (8). The snap-fit ​​disc (9) is slidably snapped with the connecting shaft (6) through the snap blocks (10).

6. The backrest adjustment structure as described in claim 1, characterized in that, The unlocking bracket (12) has a through shaft (14) at one end near the backrest frame (2). The backrest frame (2) has a sliding groove (18) for the through shaft (14) to slide through, and the through shaft (14) passes through the backrest frame (2).

7. The backrest adjustment structure as described in claim 1, characterized in that, The backrest frame (2) is fitted with a connecting spring (16) on its outside. The two ends of the connecting spring (16) are connected to the snap-fit ​​assembly (4) and the sliding sleeve (15) respectively, and the connecting spring (16) is spirally fitted on the outside of the backrest frame (2).

8. The backrest adjustment structure as described in claim 7, characterized in that, The sliding sleeve (15) is provided with a spring buckle (19), and the backrest frame (2) is provided with a slot. The spring buckle (19) passes through the slot and is connected to the backrest frame (2) for the return of the sliding sleeve (15).

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