Backrest adjusting mechanism

Abstract

The utility model discloses a backrest adjusting mechanism which comprises a backrest framework, a seat frame, a backrest lower support and a controllable linear telescopic piece. The controllable linear telescopic piece is transversely arranged below the seat frame, the front end of the controllable linear telescopic piece is hinged to the backrest framework, and the rear end of the controllable linear telescopic piece is hinged to the backrest lower support. The backrest lower support is located below the backrest framework and hinged to the backrest framework and the seat frame. The hinged point of the backrest framework and the backrest lower support is located on the rear quarter section of the length of the whole seat and is higher than the seat frame. The backrest adjusting mechanism provided by the utility model is suitable for a folding wheelchair or a seat, provides back support adjustment for a human body, and solves the problems that an adjustable backrest mechanism of a current wheelchair is uncomfortable when being rubbed with the back of the human body when lying down or getting up, and is not attractive enough.

Description

Technical Field

[0001] The utility model relates to a backrest adjustment mechanism and belongs to the technical field of elderly-assisting equipment. Background Art

[0002] Traveling by wheelchair has become the main mode of transportation for many elderly and disabled people. The demand for short rests in wheelchairs is also increasing, and whether the backrest adjustment is comfortable has a great impact on the reputation of the product. Through research on the backrest-adjustable wheelchairs currently on the market, it is found that the backrest hinge point is usually set above the seat surface and above the lower bracket of the backrest. When the backrest angle is adjusted backward, the backrest hinge point will interfere with the waist, and the soft cushion on the backrest will rub against the back of the body, which will cause wrinkles on clothes after lying down, causing discomfort to the back and requiring further adjustment of clothes. In addition, the mechanism for driving the backrest adjustment in the prior art is usually set upright behind the backrest frame and the cushion, and cannot be hidden, affecting the appearance. Utility Model Content

[0003] The utility model aims to overcome the deficiencies in the prior art and to provide a backrest adjustment mechanism to solve the problems of the current adjustable backrest mechanism of the wheelchair, such as the hinge point of the backrest interfering with the waist when lying down or standing up, the uncomfortable friction between the backrest cushion and the back of the body, and the problem of poor aesthetics.

[0004] In order to achieve the above purpose, the utility model is implemented by adopting the following technical solutions:

[0005] The utility model provides a backrest adjustment mechanism, comprising a backrest frame, a seat frame, a backrest lower bracket and a controllable linear telescopic member;

[0006] The controllable linear telescopic member is disposed transversely below the seat frame, with its front end hinged to the backrest frame and its rear end hinged to the backrest lower bracket;

[0007] The backrest lower bracket is located below the backrest frame and is hinged to the backrest frame and the seat frame respectively;

[0008] The hinge point between the backrest frame and the lower backrest bracket is located at the rear quarter of the entire seat length and is higher than the seat frame.

[0009] Furthermore, an adjustable lifting backrest frame is provided above the backrest frame, and the length of the backrest frame can be adjusted to adjust the height of the entire backrest so as to be suitable for people with a wider range of heights.

[0010] Furthermore, a soft cushion is provided on the surface of the backrest frame, and a soft seat cushion is provided above the seat frame, which respectively provide protection for the back and buttocks.

[0011] Furthermore, the controllable linear telescopic component is a controllable gas spring or an electrically controlled telescopic component.

[0012] Furthermore, when the controllable linear telescopic member is a controllable gas spring, the controllable gas spring is connected to the handle by a steel wire rope, and the handle controls the expansion and contraction of the controllable gas spring, thereby achieving the angle adjustment of the backrest; the controller of the handle or the electric telescopic member can be set on the side or armrest of the seat. The structure and working principle of the controllable gas spring or the electric telescopic member can be set with reference to the prior art, and the utility model will not be repeated.

[0013] Furthermore, the vertical distance between the hinge point of the backrest frame and the lower backrest bracket and the seat frame is between 20 mm and 100 mm, and the position of the hinge point is more precisely defined so that the deviation between the hinge point and the rotation point of the body hip is smaller.

[0014] Furthermore, a seat armrest is installed at the hinge point between the backrest frame and the lower backrest bracket, which is more conducive to the user supporting the body.

[0015] Furthermore, a hinge point with other seat components is also provided at the bottom of the lower backrest bracket, for example, a hinge point with a motor mount of an intelligent control seat or a wheelchair.

[0016] Furthermore, two pairs of front and rear hinge points are provided below the seat frame to be hinged to other seat components, so as to facilitate folding of the entire seat.

[0017] When the backrest adjustment mechanism of the utility model is in use: when the controllable linear telescopic part is controlled to contract, the backrest frame rotates around the hinge point between it and the lower bracket of the backrest, and the backrest is adjusted backward to a lying position. Since the hinge point is located directly below the rotation point of the hips, the sliding friction between the back of the body and the backrest is ensured to be very small; when the controllable linear telescopic part is controlled to extend, the backrest frame rotates around the hinge point between it and the lower bracket of the backrest, and the backrest is restored forward to a sitting position.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] The backrest adjustment mechanism of the utility model is suitable for a folding wheelchair or seat, and provides back support adjustment for a human body; the backrest frame and the lower backrest bracket are hinged by a controllable linear telescopic member, and the backrest frame is rotated backward or forward by adjusting the controllable linear telescopic member, and the hinge point of the backrest frame and the lower backrest bracket is located directly below the hip rotation point, thereby ensuring that the sliding friction between the back of the body and the backrest is very small; the controllable linear telescopic member is horizontally arranged below the seat frame and is not exposed to the seat surface, which also solves the problem that the current wheelchair backrest adjustment mechanism is not aesthetically pleasing. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a first-view structural schematic diagram of a backrest adjustment mechanism provided by an embodiment of the present invention;

[0021] Figure 2 is a second perspective structural schematic diagram of a backrest adjustment mechanism provided by an embodiment of the present invention;

[0022] Figure 3 is a schematic structural diagram of a backrest frame according to an embodiment;

[0023] Figure 4 is a schematic structural diagram of a seat frame according to an embodiment;

[0024] Figure 5 is a schematic structural diagram of the lower backrest bracket described in the embodiment;

[0025] Figure 6 is the positional relationship between the hinge point J13 and the seat frame described in the embodiment;

[0026] Figure 7 is a diagram showing the position of the hinge points between the backrest adjustment mechanism and other components of the wheelchair described in the embodiment;

[0027] Figure 8 It is a schematic diagram of the state of the backrest and the back of the body during the backrest adjustment process described in the embodiment.

[0028] In the figure: 1. Backrest frame; 11. Adjustable lifting backrest frame; 2. Seat frame; 3. Backrest lower bracket; 4. Controllable linear telescopic part; 41. Handle. DETAILED DESCRIPTION

[0029] The utility model is further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and cannot be used to limit the protection scope of the utility model.

[0030] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0032] like Figure 1 and Figure 2 As shown, the utility model provides a backrest adjustment mechanism for a foldable intelligent control wheelchair, comprising a backrest frame 1, a seat frame 2, a backrest lower bracket 3 and a controllable linear telescopic member 4; the controllable linear telescopic member 4 is laterally arranged below the seat frame 2, with its front end hinged to the backrest frame 1, and its rear end hinged to the backrest lower bracket 3; the backrest lower bracket 3 is located below the backrest frame 1, and is hinged to the backrest frame 1 and the seat frame 2, respectively.

[0033] In this embodiment, the controllable linear telescopic member 4 is a controllable gas spring, which is connected to the handle 41 by a steel wire rope. The handle 41 controls the expansion and contraction of the controllable gas spring to rotate the backrest frame 1, thereby achieving angle adjustment of the backrest; the handle 41 can be set on the side of the seat or on the armrest.

[0034] like Figure 1 and Figure 2 As shown, J13 is the hinge point between the backrest frame 1 and the lower backrest bracket 3, J14 is the hinge point between the backrest frame and the controllable linear telescopic member, J23 is the hinge point between the seat frame 2 and the lower backrest bracket 3, and J34 is the hinge point between the lower backrest bracket 3 and the controllable linear telescopic member 4.

[0035] like Figure 3 As shown, in this embodiment, an adjustable lifting backrest frame 11 is provided above the backrest frame 1, and the length can be adjusted to adjust the height of the entire backrest to be suitable for people with a wider range of heights. The J14 hinge point is set in the middle of the bottom of the backrest frame 1; the J13 hinge point is located above and in front of the J14 hinge point, and is symmetrically arranged on the left and right. In this embodiment, a soft cushion (not shown in the figure) is provided on the surface of the backrest frame 1 to provide protection for the back.

[0036] like Figure 4 As shown, in this embodiment, J23 is arranged at the rear of the seat frame 2; the seat frame 2 is also provided with two pairs of front and rear hinge points, K1 and K2, which are hinged to other parts of the wheelchair, and the hinge relationship is as follows: Figure 7 As shown, it is convenient for the folding of the whole seat. In the present embodiment, a soft seat cushion (not shown) is provided above the seat frame 2 to provide protection for the buttocks.

[0037] like Figure 5 As shown, in this embodiment, J13 and J23 are arranged above the lower backrest bracket 3, and J34 is arranged in front of the lower backrest bracket 3; the bottom of the lower backrest bracket 3 is also provided with a hinge point K3 that is hinged to the motor mount of the wheelchair, and the hinge relationship is as follows: Figure 7 shown.

[0038] like Figure 6 As shown, in this embodiment, the vertical distance L1 between the J13 hinge point and the seat frame 2 is between 20 mm and 100 mm, and the J13 hinge point is located at the rear quarter of the entire wheelchair length; the hinge point is located just below the hip rotation point, thereby ensuring that the sliding friction between the back of the body and the backrest is very small.

[0039] In this embodiment, a wheelchair armrest is installed at the J13 hinge point, which is more conducive to the user's body support.

[0040] The backrest adjustment mechanism of this embodiment is used as follows: Figure 8 As shown, when the controllable linear telescopic member 4 is contracted, the backrest frame 1 rotates around the J13 hinge point, and the backrest is adjusted backward to a lying position. Since the hinge point is located directly below the hip rotation point, the sliding friction between the back of the body and the backrest is ensured to be very small; when the controllable linear telescopic member 4 is extended, the backrest frame 1 rotates around the J13 hinge point, and the backrest is restored forward to a sitting position.

[0041] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A backrest adjustment mechanism, characterized in that: It comprises a backrest frame (1), a seat frame (2), a backrest lower bracket (3) and a controllable linear telescopic member (4); The controllable linear telescopic member (4) is laterally arranged below the seat frame (2), with its front end hinged to the backrest frame (1) and its rear end hinged to the backrest lower bracket (3); The backrest lower bracket (3) is located below the backrest frame (1) and is hinged to the backrest frame (1) and the seat frame (2) respectively; The hinge point between the backrest frame (1) and the lower backrest bracket (3) is located at the rear quarter of the entire seat length and is higher than the seat frame (2).

2. The backrest adjustment mechanism according to claim 1, characterized in that: An adjustable lifting backrest frame (11) is provided above the backrest frame (1).

3. The backrest adjustment mechanism according to claim 1, characterized in that: A soft cushion is provided on the surface of the backrest frame (1); and a soft seat cushion is provided above the seat frame (2).

4. The backrest adjustment mechanism according to claim 1, characterized in that: The controllable linear telescopic component (4) is a controllable gas spring or an electrically controlled telescopic component.

5. The backrest adjustment mechanism according to claim 4, characterized in that: The controllable gas spring is connected to a handle, and the extension and retraction of the controllable gas spring is controlled by the handle.

6. The backrest adjustment mechanism according to claim 1, characterized in that: The vertical distance between the hinge point of the backrest frame (1) and the lower backrest bracket (3) and the seat frame (2) is between 20 mm and 100 mm.

7. The backrest adjustment mechanism according to claim 1, characterized in that: A seat armrest is installed at the hinge point between the backrest frame (1) and the lower backrest bracket (3).

8. The backrest adjustment mechanism according to claim 1, characterized in that: The bottom of the backrest lower bracket (3) is also provided with a hinge point with other seat components.

9. The backrest adjustment mechanism according to claim 1, characterized in that: Two pairs of front and rear hinge points are also provided below the seat frame (2) for hinge connection with other seat components.

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