Adjustable backrest

Abstract

According to the adjustable backrest provided by the utility model, through the simple operation of rotating the air valve body 11, the connection states of the inflation assembly 2 and the deflation assembly 3 to the first air bag 4 or the second air bag 5 are switched, so that the two air bags can be independently inflated and deflated, and the angle, the bulging height and the deformation degree of the inflatable backrest can be adjusted; and meanwhile, through the structural design, the sealing performance and the operation hand feeling are good.

Description

TECHNICAL FIELD

[0001] The utility model relates to a backrest, especially an adjustable backrest. BACKGROUND

[0002] The adjustable inflatable backrest on the market adopts a single air valve to control the inflation and deflation of the whole air bag, cannot realize independent control of the upper and lower air bags, limits the flexibility and comfort of the backrest use, and cannot satisfy the individualized demand of users for different supporting forces; the traditional air valve device is often complex in structure, has many components, leads to large overall volume, increases the manufacturing cost, and limits its application in small or portable inflatable equipment; poor sealing; some air valve devices are prone to air leakage after long time use due to aging of the sealing material or unreasonable structure design, which affects the use effect and service life of the adjustable backrest; inconvenient operation: some air valve devices need to be operated or adjusted by the user multiple times during the inflation and deflation process, which is tedious and reduces the user experience. In addition, the traditional air valve structure is often large in volume and complex to install, which is not convenient for application in small or portable inflatable equipment. Therefore, it is particularly important to develop an adjustable backrest which is simple in structure and comprehensive in function. SUMMARY

[0003] Therefore, the utility model provides a kind of adjustable backrest of convenient inflation and deflation to solve above-mentioned problems.

[0004] To achieve the above-mentioned purposes, the technical solutions provided by the utility model are as follows:

[0005] An adjustable backrest comprises a backrest shell, an air valve assembly (1), an inflation assembly (2), a deflation assembly (3), a first air bag (4) and a second air bag (5). The air valve assembly (1) comprises an air valve body (11) and an air valve shell (12) containing the air valve body (11). The air valve body (11) is rotatably arranged in the air valve shell (12). The air valve shell (12) has three air pipe interfaces (13) corresponding to the inflation assembly (2), the first air bag (4) and the second air bag (5) respectively. The air valve body (11) has two air valve holes (14) spaced apart from each other. The air valve holes (14) are connected by an air passage (15) inside the air valve body (11).

[0006] When the air valve body (11) is rotated to a first position, the two air valve holes (14) and the air passage (15) are connected to the inflation assembly (2) and the first air bag (4). When the air valve body (11) is rotated to a second position, the two air valve holes (14) and the air passage (15) are connected to the inflation assembly (2) and the second air bag (5), so that the inflation assembly (2) is connected to the first air bag (4) or the second air bag (5) to inflate them.

[0007] The air vent pipe (15) inside the air valve body (11) has a deflation outlet (16), the deflation assembly (3) is arranged in the air valve shell (12) and connected with the deflation outlet (16), and the deflation assembly (3) is in a closed state when being inflated; when the deflation assembly (3) is opened, air flows out from the deflation outlet (16) through the deflation assembly (3).

[0008] Through the technical scheme provided by the utility model, the following beneficial effects are achieved: through the simple operation of rotating the air valve body 11, the connection state of the inflation assembly 2 and the deflation assembly 3 to the first air bag 4 or the second air bag 5 is switched, that is, independent inflation and deflation of the two air bags can be realized, the angle, the inflated height and the deformability of the adjustable backrest are adjusted, and the structure design makes the adjustable backrest have good sealing performance and operation feeling. BRIEF DESCRIPTION OF DRAWINGS

[0009] Figure 1 Fig. 4 is a perspective exploded view of the air valve assembly, the inflation assembly, the deflation assembly and the air valve connecting piece in the embodiment;

[0010] Figure 2 Fig. 4 is a perspective exploded view of the air valve assembly, the inflation assembly, the deflation assembly and the air valve connecting piece in the embodiment;

[0011] Figure 3 Fig. 4 is a perspective exploded view of the air valve assembly, the inflation assembly, the deflation assembly and the air valve connecting piece in the embodiment;

[0012] Figure 4 Fig. 4 is a perspective exploded view of the air valve assembly, the inflation assembly, the deflation assembly and the air valve connecting piece in the embodiment;

[0013] Figure 5 Fig. 4 is a perspective exploded view of the air valve assembly, the inflation assembly, the deflation assembly and the air valve connecting piece in the embodiment;

[0014] Figure 6 Fig. 4 is a perspective exploded view of the air valve assembly, the inflation assembly, the deflation assembly and the air valve connecting piece in the embodiment;

[0015] Figure 7 Fig. 4 is a perspective exploded view of the air valve assembly, the inflation assembly, the deflation assembly and the air valve connecting piece in the embodiment;

[0016] Figure 8 Fig. 4 is a perspective exploded view of the air valve assembly, the inflation assembly, the deflation assembly and the air valve connecting piece in the embodiment; DETAILED DESCRIPTION

[0017] To further illustrate the embodiments, the present application provides the accompanying drawings. These drawings are part of the disclosure of the present application, which are mainly used to illustrate the embodiments, and can be used to explain the operating principle of the embodiments in conjunction with the related description of the specification. With reference to these contents, those skilled in the art should be able to understand other possible implementations and the advantages of the present application. The components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0018] In the description of the present application, the terms "upper", "lower", "left", "right", "front", "back" and other orientation or position relationships are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, therefore cannot be understood as a limitation on the present application.

[0019] The present application will be further described in conjunction with the drawings and specific embodiments.

[0020] Referring to Figures 1 to 8 The adjustable backrest provided by the present embodiment includes a backrest shell, a gas valve assembly 1, an inflation assembly 2, a deflation assembly 3, a first air bag 4 and a second air bag 5, characterized in that the gas valve assembly 1 includes a gas valve body 11 and a gas valve housing 12 accommodating the gas valve body 11, the gas valve body 11 is rotatably arranged in the gas valve housing 12, the gas valve housing 12 has three gas pipe interfaces 13 corresponding to the inflation assembly 2, the first air bag 4 and the second air bag 5 respectively, the gas valve body 11 has two mutually spaced gas valve holes 14 thereon, and the gas valve holes 14 are connected by an air passage 15 inside the gas valve body 11.

[0021] When the gas valve body 11 is rotated to a first position, the two gas valve holes 14 and the air passage 15 can be connected to the inflation assembly 2 and the first air bag 4, at this time, opening the deflation assembly 3 only deflates the first air bag 4; when the gas valve body 11 is rotated to a second position, the two gas valve holes 14 and the air passage 15 can be connected to the inflation assembly 2 and the second air bag 5, at this time, opening the deflation assembly 3 only deflates the second air bag 5; the inflation assembly 2 is connected to the first air bag 4 or the second air bag 5 to inflate it, and the deflation assembly 3 is connected to the first air bag 4 or the second air bag 5 to deflate it;

[0022] The air valve body 11 has a venting pipe 15 inside, which has a venting outlet 16, and the venting assembly 3 is arranged in the air valve shell 12 and connected with the venting outlet 16. When the air is filled, the venting assembly 3 is in a closed state. When the venting assembly 3 is opened, the air flows out from the venting outlet 16 through the venting assembly 3. By independently filling and discharging the two air bags, the angle, the bulging height and the deformability of the adjustable backrest can be adjusted.

[0023] In the embodiment, the air valve body 11 is cylindrical, the venting outlet 16 is located at the central position of the air valve body 11, and the included angle of the two air valve holes 14 relative to the line connecting the central position is 90 degrees in perpendicular relationship. The lines connecting the three air pipe interfaces 13 relative to the central position of the air valve shell 12 are respectively perpendicular or coincident.

[0024] The structure design of the air valve body 11 and the air valve shell 12 described above is one of the more preferred embodiments in the present scheme. Of course, in other embodiments, the structure design is not limited thereto. For example, the perpendicular angle relationship is changed to a 100-degree angle. When the air valve body 11 is rotated, the connection state of the air filling assembly 2 and the venting assembly 3 to the first air bag 4 or the second air bag 5 can also be switched.

[0025] Further, the air valve body has two transversely arranged sealing ring strips 81 on the outer side wall. The two sealing ring strips 81 are respectively located above and below the air valve hole 14. The air valve hole 14 has two vertically arranged sealing vertical strips 82 on both sides. The two ends of the sealing vertical strips 82 are connected with the sealing ring strips 81. The sealing ring strips 81 and the sealing vertical strips 82 are in abutting and sealing cooperation with the inner side wall of the air valve shell 12, so as to maintain the sealing cooperation between the air valve hole 14 and the air pipe interface 13 after the air valve body 11 is rotated.

[0026] Further, there are a first air pipe 6 and a second air pipe 7. The air pipe interface 13 of the air valve shell 12 is connected with the first air bag 4 or the second air bag 5 through the first air pipe 6 or the second air pipe 7. The distance between the air valve shell 12 and the first air bag 4 or the second air bag 5 is extended through the first air pipe 6 and the second air pipe 7, which facilitates the arrangement of the components of the air valve device.

[0027] Further, the air valve assembly 1 further comprises an air valve connector 9 connected with the air valve body 11, the inner side wall of the air valve shell 12 is provided with at least two damping holes 121, the outer side wall of the air valve connector 9 is provided with at least one elastic protrusion 91 corresponding to the damping holes 121; rotating the air valve connector 9 drives the air valve body 11, when the inflation assembly 2 is connected with the first air tube 6 or the second air tube 7, the elastic protrusion 91 is clamped into the damping hole 121, so as to improve the operation feeling when rotating the air valve body 11 to the designated position.

[0028] Further, at least one connecting column 92 is arranged below the air valve connector 9, and at least one connecting blind hole 111 is arranged above the air valve body 11, the connecting column 92 is inserted into the connecting blind hole 111, so that the air valve connector 9 is connected and drives the air valve body 11 to move.

[0029] Further, the inflation assembly 2 is provided with an inflation ball 21 and a one-way inflation valve 22 which are both made of elastic material, the one-way inflation valve 22 is connected with the air tube interface 13 and the inflation ball 21, the inner wall of the one-way inflation valve 22 is provided with a slit 23, when inflating, the slit 23 is expanded under pressure to allow air to pass through, and when stopping inflation, the slit 23 is closed to prevent air backflow; the inflation ball 21 is provided with a one-way air inlet structure 24, which can adopt the existing technology, so as to realize the one-way air suction of the inflation ball 21 from the outside, such as a one-way opening elastic valve; when the inflation ball 21 is squeezed, air enters the air valve body 11 through the one-way inflation valve 22 and the air tube interface 13.

[0030] Further, the air valve shell 12 is internally provided with an air valve shell support plate 17, the air valve body 11 and the deflation assembly 3 are respectively sealed and installed on both sides of the air valve shell support plate 17, the air valve shell support plate 17 is provided with a support plate deflation hole 171 corresponding to the deflation outlet 16, the deflation assembly 3 is connected with the support plate deflation hole 171 and is provided with a spring 31, a deflation button 32 and a deflation assembly mounting seat 33, the deflation assembly mounting seat 33 is sealed and matched with the air valve shell 12 and is provided with a mounting seat deflation hole 34, the spring 31 is installed between the air valve shell support plate 17 and the deflation button 32, and the deflation button 32 blocks the mounting seat deflation hole 34; when the deflation button 32 is pressed inward, the spring 31 is compressed and contracted, air flows out through the deflation outlet 16, the support plate deflation hole 171 and the mounting seat deflation hole 34. In the embodiment, the deflation outlet 16 is located at the central position of the air valve body 11, therefore, when the air valve body 11 is rotated, the deflation outlet 16 always corresponds to the support plate deflation hole 171.

[0031] Further, a bottom sealing strip 83 is arranged around the air outlet 16 below the air valve body 11, and rotatably abuts with the air valve shell support plate 17 to keep the air outlet 16 in sealing cooperation with the support plate air outlet hole 171 when the air valve body 11 is rotated.

[0032] Further, the air release button 32 has an abutting portion 321 abutting with the air release assembly mounting seat 33, and a stud portion 322 penetrating through the mounting seat air release hole 34; the abutting portion 321 is provided with a sealing ring 323 around the mounting seat air release hole 34 to ensure the sealing abutting of the abutting portion 321 to the mounting seat air release hole 34; the abutting portion 321 blocks the mounting seat air release hole 34, and the stud portion 322 is connected with the abutting portion 321 and extends out of the mounting seat air release hole 34 to be pressed by the user; in this embodiment, there is a gap between the stud portion 322 and the mounting seat air release hole 34 for air flow.

[0033] Although the utility model is specifically shown and introduced in combination with the preferred embodiments, it should be understood by those skilled in the art that various changes can be made in form and details without departing from the spirit and scope of the utility model defined in the appended claims, and all the changes are within the protection scope of the utility model.

Claims

1. An adjustable backrest comprising a backrest housing, a gas valve assembly (1), an inflation assembly (2), a deflation assembly (3), a first airbag (4) and a second airbag (5), characterized in that, The gas valve assembly (1) comprises a gas valve body (11) and a gas valve shell (12) containing the gas valve body (11), the gas valve body (11) is rotatably arranged in the gas valve shell (12), the gas valve shell (12) has three gas pipe interfaces (13) and corresponds to the inflation assembly (2), the first air bag (4) and the second air bag (5) respectively, the gas valve body (11) has two gas valve holes (14) spaced apart from each other, and the gas valve holes (14) are connected by a gas pipeline (15) in the gas valve body (11). When the gas valve body (11) is rotated to a first position, the two gas valve holes (14) and the gas pipeline (15) can be connected with the inflation assembly (2) and the first air bag (4); when the gas valve body (11) is rotated to a second position, the two gas valve holes (14) and the gas pipeline (15) can be connected with the inflation assembly (2) and the second air bag (5), so that the inflation assembly (2) is connected with the first air bag (4) or the second air bag (5) to inflate them. The gas pipeline (15) in the gas valve body (11) has a gas leakage outlet (16), the gas leakage assembly (3) is arranged in the gas valve shell (12) and connected with the gas leakage outlet (16), and the gas leakage assembly (3) is in a closed state during inflation; when the gas leakage assembly (3) is opened, air flows out from the gas leakage outlet (16) through the gas leakage assembly (3).

2. An adjustable backrest according to claim 1, characterized in that The outer side wall of the gas valve body (11) has two transversely arranged sealing ring strips (81), the two sealing ring strips (81) are located above and below the gas valve hole (14) respectively, the two sides of the gas valve hole (14) have two vertically arranged sealing vertical strips (82), the two ends of the sealing vertical strips (82) are connected with the sealing ring strips (81), and the sealing ring strips (81) and the sealing vertical strips (82) are in abutting sealing cooperation with the inner side wall of the gas valve shell (12).

3. The adjustable backrest of claim 1, wherein, It also has a first gas pipe (6) and a second gas pipe (7), and the gas pipe interface (13) of the gas valve shell (12) is connected with the first air bag (4) or the second air bag (5) through the first gas pipe (6) or the second gas pipe (7).

4. An adjustable backrest according to claim 3, characterised in that, The gas valve assembly (1) further comprises a gas valve connecting piece (9) connected with the gas valve body (11), the inner side wall of the gas valve shell (12) is provided with at least two damping holes (121), the outer side wall of the gas valve connecting piece (9) has at least one elastic protrusion (91) and is provided correspondingly with the damping holes (121); when the gas valve connecting piece (9) drives the gas valve body (11), the inflation assembly (2) is connected with the first gas pipe (6) or the second gas pipe (7), and the elastic protrusion (91) is clamped into the damping hole (121).

5. An adjustable backrest according to claim 4, characterised in that, The air valve connecting piece (9) is provided below with at least one connecting column (92), and the air valve body (11) is provided above with at least one connecting blind hole (111), the connecting column (92) is inserted into the connecting blind hole (111), so that the air valve connecting piece (9) is connected and drives the air valve body (11) to move.

6. The adjustable backrest of claim 1, wherein, The inflating assembly (2) is provided with an inflating ball (21) and a one-way inflating valve (22) which are both made of elastic material, the one-way inflating valve (22) is connected with the air tube interface (13) and the inflating ball (21), the one-way inflating valve (22) is provided with a slit (23) on the inner wall, the slit (23) is opened to allow air to pass when inflating, and the slit (23) is closed to prevent air backflow when stopping inflating; the inflating ball (21) is provided with a one-way air inlet structure (24); when the inflating ball (21) is squeezed, air enters the air valve body (11) through the one-way inflating valve (22) and the air tube interface (13).

7. The adjustable backrest of claim 1, wherein, The air valve shell (12) is internally provided with an air valve shell support plate (17), the air valve body (11) and the deflating assembly (3) are respectively and sealingly installed on two sides of the air valve shell support plate (17), the air valve shell support plate (17) is provided with a support plate deflation hole (171) corresponding to the deflation outlet (16), the deflating assembly (3) is connected with the support plate deflation hole (171) and is provided with a spring (31), a deflation button (32) and a deflating assembly mounting seat (33), the deflating assembly mounting seat (33) is sealingly matched with the air valve shell (12) and is provided with a mounting seat deflation hole (34), the spring (31) is installed between the air valve shell support plate (17) and the deflation button (32), and the deflation button (32) blocks the mounting seat deflation hole (34); when the deflation button (32) is pressed, the spring (31) is compressed and contracted, and air flows out through the deflation outlet (16), the support plate deflation hole (171) and the mounting seat deflation hole (34).

8. An adjustable backrest according to claim 7, characterised in that, The air valve body (11) is provided below the deflation outlet (16) with a bottom sealing strip (83) which is rotatably matched with the air valve shell support plate (17).

9. The adjustable backrest of claim 7, wherein, The deflation button (32) is provided with an abutting portion (321) which is matched with the deflating assembly mounting seat (33) and a stud portion (322) which passes through the mounting seat deflation hole (34); the abutting portion (321) is provided around the mounting seat deflation hole (34) with a sealing ring (323) corresponding to the mounting seat deflation hole (34); the abutting portion (321) blocks the mounting seat deflation hole (34), and the stud portion (322) is connected with the abutting portion (321) and extends out of the mounting seat deflation hole (34) to be pressed by a user.

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