A new double-layer airbag

Abstract

The utility model relates to a novel double-layer air bag relates to the electronic product class and the like product such as detection instrument of health, medical treatment, health field uses micro air bag. Including the upper air bag and lower air bag of upper and lower superposed and air bag inner chamber intercommunication, the upper air bag is formed by upper air bag upper sheet material and upper air bag lower sheet material, the lower air bag is formed by lower air bag upper sheet material and lower air bag lower sheet material, the upper air bag lower sheet material has the middle fusion area A of closed perimeter, the lower air bag upper sheet material has the middle fusion area B of closed perimeter, the middle fusion area A and middle fusion area B butt joint fusion, the upper air bag upper sheet material is preset with the convex surface that protrudes outward in the upper air bag upper sheet material periphery fusion area, forms the convex hull, and the convex hull is a cavity with volume. The utility model technical scheme can make the air bag shape change distance change big before and after inflation, and simultaneously still can make one air bag of double-layer air bag make into the double-layer air bag of four fusion edges all hiding in the cavity.

Description

Technical Field

[0001] This utility model relates to a novel double-layer airbag and its manufacturing method, specifically to a plastic airbag, particularly a miniature airbag used in electronic products and similar products such as testing instruments in the fields of health care, medical treatment, and hygiene. Background Technology

[0002] Existing two-piece micro-airbags are formed by hot-pressing or bonding upper and lower sheets together. Before welding, both sheets are flat and flat. When fully inflated, the airbag's cross-section is typically circular or elliptical. Therefore, the maximum distance the airbag can deform before and after inflation is the diameter of its circular cross-section. To increase this deformation distance, two or more micro-airbags are sometimes stacked together, generally referred to as double-layer or multi-layer airbags.

[0003] With increasingly stringent usage requirements, airbags need to be manufactured without welded edges. Current technology for producing welded-edge airbags typically involves hot-pressing and welding three edges of an upper and lower sheet to create a preliminary airbag blank, similar to a cloth bag. This blank is then turned inside out, so the inside becomes the outside, and vice versa, allowing the welded edges formed by the three hot-pressing processes to be incorporated into the airbag cavity. Finally, the opening of the cloth bag is hot-pressed and welded to form a sealed airbag. In this method, a single airbag actually has three welded edges concealed within the airbag, while one welded edge is exposed. It is impossible to achieve a design where all four welded edges are concealed within the airbag cavity.

[0004] For double-layer or multi-layer airbags, since the airbags need to be connected and fixed together, the method of flipping a single airbag to create a double-layer airbag is not feasible. Therefore, no double-layer or multi-layer airbags with hidden welded edges have been found in the existing technology; the welded edges are always exposed. This makes it difficult to meet market needs. Summary of the Invention

[0005] The purpose of this invention is to provide a novel double-layer airbag and its manufacturing method, overcoming the shortcomings of existing technologies. This invention not only increases the deformation distance of the airbag before and after inflation, but also allows one of the airbags in the double-layer airbag to be manufactured with all four welded edges hidden within the airbag cavity.

[0006] The present invention provides a novel double-layer airbag, comprising an upper airbag and a lower airbag stacked vertically and connected in their internal cavities. The upper airbag is formed by welding an upper sheet and a lower sheet of the upper airbag together through a periphery welding area. The lower airbag is formed by welding an upper sheet and a lower sheet of the lower airbag together through a periphery welding area. The lower sheet of the upper airbag has a circumferentially closed central welding area A, and the corresponding upper sheet of the lower airbag has a circumferentially closed central welding area B. The central welding areas A and B are welded together to form the stacked upper and lower airbags. The upper sheet of the upper airbag has a protruding convex surface within its periphery welding area, forming a bulge, which contains a cavity with a volume.

[0007] The aforementioned novel double-layer airbag has an elongated through-hole A in the central welding area A, and a corresponding elongated through-hole B in the central welding area B.

[0008] In the aforementioned novel double-layer airbag, the long side of the lower airbag sheet is longer than the long side of the upper airbag sheet in the length direction, and the periphery welding area of ​​the upper airbag sheet is smaller than the periphery welding area of ​​the lower airbag sheet. After the upper airbag sheet is tensioned, the periphery welding area of ​​the upper airbag sheet and the periphery welding area of ​​the lower airbag sheet are aligned and welded together to form the lower airbag.

[0009] Compared to existing technologies, this invention pre-fabricates the upper or lower sheet of the airbag with an outwardly protruding convex surface, resulting in a larger deformation range before and after inflation. The double-layer airbag of this invention uses elongated through-holes in the middle welding area A of the lower sheet of the upper airbag and the middle welding area B of the upper sheet of the lower airbag. This allows the upper airbag to be flipped over through these elongated through-holes, thus concealing all four welding edges of the upper airbag within its cavity. This truly achieves complete concealment of the welding edges of the double-layer airbag. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of an embodiment of a novel double-layer airbag of this utility model when it is not inflated.

[0011] Figure 2 This is a schematic diagram of the inflation process of a novel double-layer airbag according to Embodiment 1 of this utility model.

[0012] Figure 3 for Figure 2 The AA section view is shown.

[0013] Figure 4 for Figure 2 The BB section view is shown.

[0014] Figure 5 This is a front view of the upper sheet of a novel double-layer airbag according to the present invention.

[0015] Figure 6 for Figure 5 The image shown is a bottom view.

[0016] Figure 7 This is a front view of the upper airbag and the lower sheet of the novel double-layer airbag according to the present invention.

[0017] Figure 8 for Figure 7 The image shown is a bottom view.

[0018] Figure 9 This is a front view of the upper sheet of the lower airbag of a novel double-layer airbag according to the present invention.

[0019] Figure 10 for Figure 9 The image shown is a bottom view.

[0020] Figure 11 This is a schematic diagram of a second embodiment of the novel double-layer airbag of this utility model when it is not inflated. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the embodiments and accompanying drawings. (Refer to...) Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 The illustration shows a novel double-layer airbag embodiment of this utility model. It includes an upper airbag 1 and a lower airbag 2 stacked vertically and connected in their internal cavities. The upper airbag 1 is formed by an upper airbag sheet 11 and a lower airbag sheet 12, fixed together by a welding area 111 around the upper airbag sheet and a welding area 121 around the lower airbag sheet. The lower airbag 2 is formed by an upper airbag sheet 21 and a lower airbag sheet 22, fixed together by a welding area 211 around the lower airbag sheet and a welding area 221 around the lower airbag sheet. The lower sheet 12 of the upper airbag has a circumferentially closed central welding area A122, and the upper sheet 21 of the corresponding lower airbag has a circumferentially closed central welding area B212 corresponding to the central welding area A122. The central welding areas A122 and B212 are joined and welded together to form an upper airbag 1 and a lower airbag 2 stacked together. The upper sheet 11 of the upper airbag has a pre-set outwardly protruding convex surface within the peripheral welding area 111, forming a convex bulge. The convex bulge contains a cavity with a volume, such as... Figure 5 , Figure 6As shown, before manufacturing the upper airbag 1, the upper airbag sheet 11 is pre-pressed into a convex shape using a mold, with the portion within the welding area 111 around the upper airbag sheet forming an outwardly protruding convex surface. Thus, the upper airbag 1 already has a certain preset expansion amount before inflation, resulting in a greater expansion deformation after inflation, making it superior to airbags in the prior art.

[0022] A more prominent and superior structural feature of this embodiment is that the central welding area A122 has an elongated through-hole A123, and correspondingly, the central welding area B212 has an elongated through-hole B213. The lower sheet 12 of the upper airbag and the upper sheet 21 of the lower airbag are joined together along the central welding area A122 and the central welding area B212, and the central welding area A122 and the central welding area B212 are hot-pressed together to form a central welding edge. At this time, the through-hole A123 and the through-hole B213 are relatively connected. The four welding edges formed by the hot-pressing of the peripheral welding area 111 of the upper airbag 1 and the peripheral welding area 121 of the lower airbag 1 are all located inside the airbag cavity of the upper airbag 1 and are not exposed to the outside, truly achieving complete concealment of the welding edges of the double-layer airbag. This completely eliminates the possibility of hard welded edges formed during the airbag manufacturing process affecting user comfort or even damaging the skin when they come into contact with it.

[0023] Reference Figure 11 , Figure 7 , Figure 8 The illustration shows a second embodiment of a novel double-layer airbag according to this utility model. Unlike embodiment one, the long side of the lower airbag sheet 22 is longer than the long side of the upper airbag sheet 21. The periphery welding area 211 of the upper airbag sheet is smaller than the periphery welding area 221 of the lower airbag sheet. This allows the upper airbag sheet 21 to be tensioned through the tensioning holes 23 at both ends, resulting in the lower airbag being fused and fixed with its periphery welding area 211 and the lower airbag sheet 221. Because the upper and lower airbag sheets 21 and 22 are of different lengths, the lower airbag naturally forms an arc shape, commonly referred to as an arc-shaped airbag. This arc-shaped airbag is more suitable for use in arc-shaped testing equipment such as watch straps.

[0024] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, and these all fall within the protection scope of the present invention.

Claims

1. A new type of double-layer air bag, comprising an upper air bag and a lower air bag stacked one above the other and having their air bag cavities connected; the upper air bag is formed by an upper air bag upper sheet and an upper air bag lower sheet being fixed by the periphery fusion bonding area of the upper air bag upper sheet and the periphery fusion bonding area of the upper air bag lower sheet; the lower air bag is formed by a lower air bag upper sheet and a lower air bag lower sheet being fixed by the periphery fusion bonding area of the lower air bag upper sheet and the periphery fusion bonding area of the lower air bag lower sheet; the upper air bag lower sheet has a middle fusion bonding area A with a closed periphery, and the lower air bag upper sheet has a middle fusion bonding area B with a closed periphery corresponding to the middle fusion bonding area A; the middle fusion bonding area A and the middle fusion bonding area B are fusion bonded to form the upper air bag and the lower air bag stacked one above the other, characterized in that The upper air bag upper sheet has a convex outwardly protruding from the upper air bag upper sheet peripheral welding area to form a convexity, and the convexity has a cavity with a volume.

2. A novel dual chamber airbag according to claim 1, characterized in that The middle welding area A has a long strip-shaped through hole A, and the middle welding area B has a long strip-shaped through hole B corresponding to the through hole A.

3. A new type of double-layer airbag according to claim 1 or 2, characterized in that The length of the long side of the lower air bag lower sheet is longer than that of the long side of the lower air bag upper sheet, the lower air bag upper sheet peripheral welding area is smaller than the lower air bag lower sheet peripheral welding area, and the lower air bag upper sheet peripheral welding area and the lower air bag lower sheet peripheral welding area are connected and welded to form the lower air bag after the lower air bag upper sheet is tensioned.

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