Adjustable backrest belt of four-wheel cart

Abstract

Connecting seats are arranged at the two ends of a belt-shaped main body, the inner ends of the connecting seats are connected with the outer end of the belt-shaped main body, the outer ends of the connecting seats are connected with the side of a support of the four-wheel cart, each connecting seat comprises an inner connector, an extension body, an outer connector and a positioning assembly, and an inserting hole is formed in each outer connector from the inner end to the inside. The outer end of the extension body extends into the insertion hole, at least two positioning holes are formed in the extension body in the length direction, the positioning assembly penetrates through the outer connector and one positioning hole in the extension body for positioning, the inner end of the extension body is fixed to the outer end of the inner connector, and the inner end of the inner connector is connected with the outer end of the strip-shaped body. The position of the adjustable backrest belt relative to the depth of a seat cushion is changed through the extension body, the backward leaning space of the upper body is large in the sitting posture, the sitting posture is comfortable, the safety is good, pushing is not affected, the occupied space is small in the storage process, the adjustable structure is convenient to operate, the overall length of the extension body can be designed in combination with the outer connector, and the whole backrest belt has the large adjustable length range.

Description

Technical Field

[0001] This utility model relates to a four-wheeled stroller for assisting walking, and in particular to a backrest strap for a four-wheeled stroller. Background Technology

[0002] A four-wheeled walking trolley is a type of trolley primarily designed for users with mobility impairments to move around, providing support and assistance for their walking. Compared to wheelchairs and crutches, a four-wheeled walking trolley allows users to push it themselves, making it convenient for practice and exercise. It also offers good stability, high safety, and a seat cushion for resting.

[0003] To take advantage of the small overall size of the four-wheeled stroller and its ease of movement, its seat depth is almost half that of a wheelchair seat. The backrest straps above the seat also match the seat depth. However, this limits the seating space, as the depth of space that can accommodate the body is small, making it uncomfortable to sit in. Utility Model Content

[0004] Purpose of the utility model: The purpose of this utility model is to provide a backrest strap for a four-wheeled stroller. When the seat cushion depth is small, the length of the backrest strap can be increased by adjusting the backrest strap to provide a larger sitting space above the seat cushion.

[0005] Technical Solution: An adjustable backrest strap for a four-wheeled trolley includes a strip-shaped main body. Connecting seats are provided at both ends of the strip-shaped main body. The inner end of the connecting seat is connected to the outer end of the strip-shaped main body, and the outer end of the connecting seat is laterally connected to a four-wheeled trolley bracket. The connecting seat includes an inner connector, an extension body, an outer connector, and a positioning component. The outer connector has an insertion hole extending from its inner end inwards. The outer end of the extension body extends into the insertion hole. The extension body has at least two positioning holes along its length. The positioning component positions the outer connector and one of the positioning holes on the extension body. The inner end of the extension body is fixed to the outer end of the inner connector, and the inner end of the inner connector is connected to the outer end of the strip-shaped main body.

[0006] Furthermore, a connecting groove is formed on the surface of the extension body, which connects each of the positioning holes sequentially. When switching positioning holes, the connecting groove guides the movement of the positioning post and its entry into the new positioning hole, facilitating adjustment and avoiding difficulties in finding and inserting the hole.

[0007] Ideally, the depth of the connecting groove is less than the depth of the positioning hole, so that during adjustment, one can sense whether the hole is in position or the adjustment is in progress by feeling the depth.

[0008] Furthermore, the positioning component includes a pressing plate, a spring, a pivot pin, and a positioning post. The pressing plate is in the same direction as the external connector in terms of length. The middle part of the pressing plate is connected to the inner end of the external connector (excluding the insertion hole area) by the pivot pin. The pressing plate is swayable by the pivot pin. The outer end of the pressing plate is connected to the surface of the external connector by the spring. The positioning post is disposed at the inner end of the pressing plate and faces the positioning hole.

[0009] Ideally, a receiving chamber extends outward from the inner end surface of the external connector. This receiving chamber has an opening, and the pressing plate is placed within it through this opening. The middle portion of the pressing plate is connected to the wall of the receiving chamber via a pin. A through hole is formed on the bottom surface of the receiving chamber, and the positioning pin extends from this through hole towards the positioning hole. By placing the positioning component outside the external connector through the receiving chamber, operation of the positioning component is facilitated. The pressing plate is connected to the wall of the receiving chamber via a pin, and the pin connection point is in an area on the external connector where no insertion hole is provided, thus avoiding interference with the extension body within its insertion hole.

[0010] Furthermore, the extension body is plate-shaped, and it is configured and connected to the strip-shaped main body in the same width direction. This makes the backrest strap as a whole flat in the thickness direction.

[0011] Furthermore, the outer end of the external connector is a U-shaped bayonet, which can be directly engaged with the vertical rod on the side of the four-wheeled trolley bracket.

[0012] Beneficial effects: The advantages of this utility model are: the adjustable backrest strap changes its position relative to the seat cushion depth by extending the body, providing more space for the upper body to lean back when sitting, resulting in a comfortable and safe sitting posture. It does not affect pushing or storing and occupies little space. The adjustable structure is easy to operate, and when switching positioning holes, it avoids the inconvenience of finding the hole or difficulty in inserting it. The overall length of the extension body can be designed together with the external connector, so that the backrest strap has a large adjustable length range. Attached Figure Description

[0013] Figure 1 This is the main view of this application, with the extended body in the pulled-out state;

[0014] Figure 2 The connector is in the folded state;

[0015] Figure 3 for Figure 2 Schematic diagram of the connection between the inner and outer connectors and the extension body;

[0016] Figure 4 for Figure 3 Top view;

[0017] Figure 5 for Figure 3 AA section view;

[0018] Figure 6 for Figure 3 A schematic diagram showing the connection of the extended body in the pulled-out state;

[0019] Figure 7 for Figure 6 BB section view;

[0020] Figure 8 This is a schematic diagram of the installation of this application on a four-wheeled cart. Detailed Implementation

[0021] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments.

[0022] A four-wheeled stroller with an adjustable backrest, as shown in the attached image. Figure 8 As shown, the backrest strap is located above the seat cushion of the four-wheeled stroller, and both ends of the backrest strap are connected and installed to the sides of the four-wheeled stroller bracket.

[0023] The structure of the adjustable backrest straps is shown in the attached figure. Figure 1 , 8 As shown, it includes a strip-shaped main body 1 and a connecting seat 2. One connecting seat 2 is provided at each end of the strip-shaped main body 1. The inner end of the connecting seat 2 is connected to the outer end of the strip-shaped main body 1, and the outer end of the connecting seat 2 is connected and installed to the side of the four-wheeled trolley bracket.

[0024] Combined with appendix Figures 1-7 As shown, the connector 2 includes an inner connector 21, an extension 22, an outer connector 23, and a positioning component 24. The strip-shaped body 1 is generally a flat surface with a certain thickness, and its width direction is vertical. The connector 2 is also flat in the thickness direction, and its width direction is vertical. The extension 22 is plate-shaped, and its width direction is vertical. It is set and connected with the strip-shaped body 1 in the same width direction. The outer connector 23 has an insertion hole 231 from its inner end inward. The outer end of the extension 22 extends into the insertion hole 231. The inner end of the extension 22 is fixed to the outer end of the inner connector 21. The inner end of the inner connector 21 is fixed to the outer end of the strip-shaped body 1. The two ends of the inner connector 21 can be fixed by riveting or other methods.

[0025] At least two positioning holes 221 are provided on the extension body 22 along its length. A connecting groove 222 is provided on the surface of the extension body 22, which connects the positioning holes 221 in sequence. The depth of the connecting groove 222 is less than the depth of the positioning holes 221.

[0026] Adjusting the insertion length of the extension body 22 within the insertion hole 231 changes the overall length of the backrest strap. The positioning component 24 passes through and positions the external connector 23 and a positioning hole 221 on the extension body 22, fixing the length of the backrest strap. Positioning the positioning component 24 outside the external connector 23 facilitates its operation. For this purpose, a receiving chamber 232 extends outward from the inner surface of the external connector 23, with an opening 233. The positioning component 24 is installed by being placed into the receiving chamber 232 through the opening 233. Positioning assembly 24 includes a pressing plate 241, a spring 242, a pivot pin 243, and a positioning post 244. The pressing plate 241 is aligned with the outer connector 23 and the extension body 22 in the same length direction. The middle part of the pressing plate 241 is connected to the wall of the receiving chamber 232 by the pivot pin 243. The pressing plate 241 can swing by the pivot pin 243. The connection point of the pivot pin 243 is the area on the outer connector 23 where there is no insertion hole 231, and it is not connected to the extension body 22 within the insertion hole 231. Interference occurs, and the outer end of the pressing plate 241 is connected to the bottom surface of the accommodating chamber 232 (i.e., the surface of the outer connector 23) by a spring 242. This end is the pressing end of the pressing plate. The positioning post 244 is set at the inner end of the pressing plate 241 and faces downward toward the positioning hole 221. A through hole corresponding to the positioning post 244 is opened on the bottom surface of the accommodating chamber 232. The positioning post 244 moves from the through hole toward the positioning hole 221 and is locked into the positioning hole 221 for positioning. This end is the positioning end of the pressing plate.

[0027] The outer end of the external connector 23 is a U-shaped bayonet 234, which can be directly engaged with the vertical rod on the side of the four-wheeled trolley bracket, and then the opening of the U-shaped bayonet is closed by fasteners.

[0028] The adjustable backrest strap of this application has an extension section to adjust the overall length of the backrest strap. When the extension section is folded down, the backrest strap matches the seat cushion depth, resulting in a smaller overall size for the four-wheeled trolley, making it easier to push and store without taking up much space. When the extension section is extended, it increases the depth space above the seat cushion to accommodate the body, allowing for more room to lean back even with a shallow seat cushion and less contact with the buttocks, resulting in a comfortable and safe sitting posture. The adjustable structure of the backrest strap is easy to operate. The pressing end of the pressing plate is operated by a spring press, which allows the positioning post on the pressing plate to engage or disengage with the positioning hole on the extension section. The locking is reliable during positioning. Multiple positioning holes on the extension section can provide different length adjustment needs. When switching positioning holes, the connecting groove guides the movement of the positioning post and its entry into the new positioning hole, facilitating the adjustment operation and avoiding inconvenience in finding or inserting the hole. The overall length of the extension section can be designed in conjunction with the external connector to give the backrest strap a large adjustable length range.

Claims

1. An adjustable backrest strap for a four-wheeled stroller, characterized in that: The device includes a strip-shaped body (1), with connecting seats (2) at both ends. The inner end of the connecting seat (2) is connected to the outer end of the strip-shaped body (1), and the outer end of the connecting seat (2) is connected to the side of a four-wheeled trolley bracket. The connecting seat (2) includes an inner connector (21), an extension body (22), an outer connector (23), and a positioning component (24). The outer connector (23) has an insertion hole (231) from its inner end inward. The outer end of the extension body (22) extends into the insertion hole (231). The extension body (22) has at least two positioning holes (221) in the length direction. The positioning component (24) positions the outer connector (23) through one of the positioning holes (221) on the extension body (22). The inner end of the extension body (22) is fixed to the outer end of the inner connector (21), and the inner end of the inner connector (21) is connected to the outer end of the strip-shaped body (1).

2. The adjustable backrest strap of the four-wheeled stroller according to claim 1, characterized in that: A connecting groove (222) is formed on the surface of the extension body (22), and the connecting groove (222) connects each of the positioning holes (221) in sequence.

3. The adjustable backrest strap of the four-wheeled trolley according to claim 2, characterized in that: The depth of the connecting groove (222) is less than the depth of the positioning hole (221).

4. The adjustable backrest strap of the four-wheeled trolley according to claim 1, characterized in that: The positioning component (24) includes a pressing plate (241), a spring (242), a pin (243), and a positioning post (244). The pressing plate (241) is in the same direction as the outer connector (23) in length. The middle part of the pressing plate (241) is connected to the inner end of the outer connector (23) in the area other than the insertion hole (231) by the pin (243). The pressing plate (241) can swing by the pin (243). The outer end of the pressing plate (241) is connected to the surface of the outer connector (23) by the spring (242). The positioning post (244) is disposed at the inner end of the pressing plate (241) and faces the positioning hole (221).

5. The adjustable backrest strap of the four-wheeled trolley according to claim 4, characterized in that: An accommodating chamber (232) extends outward from the inner end surface of the external connector (23). The accommodating chamber (232) has an opening (233). The pressing plate (241) is placed in the accommodating chamber (232) through the opening (233). The middle part of the pressing plate (241) is connected to the wall of the accommodating chamber (232) by the shaft pin (243). A through hole is opened on the bottom surface of the accommodating chamber (232). The positioning pin (244) extends from the through hole toward the positioning hole (221).

6. The adjustable backrest strap of the four-wheeled stroller according to claim 1, characterized in that: The extension body (22) is plate-shaped, and the extension body (22) and the strip-shaped main body (1) are set and connected in the same width direction.

7. The adjustable backrest strap of the four-wheeled stroller according to claim 1, characterized in that: The outer end of the external connector (23) is a U-shaped bayonet (234).

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