JPH02224706A - Structure of water bag for water mattress - Google Patents

Abstract

PURPOSE: To reduce material fracture by forming around a water bag a reinforced seamless structural edge portion that has two sheets at which the top and bottom of the water bag, and the bonded edge portion is in touch with a top face portion of a mattress base. CONSTITUTION: A water bag of a water mattress has flat top portion 1a and bottom portion 1b bending downward formed thereon. The water bag is brought into contact with a recess 3 within mattress base 2, with the periphery of top portion 2a positioned around the wall of recess 3. Application of load P results in subjecting top portion 1a of the water bag to undergo generation of not only wrinkles starting from its edge portion to the exterior but also oblique folds. In the case of waving, the water bag encounters repeated movements, whereby it will experience material fracture and subsequent water leakage. To reduce the occurrence of folds, the water bag 1 is provided with reinforced frame-like edge portion 4, which is formed by welding top sheet 1a to bottom sheet 1b. Top sheet 1a is made flat while bottom sheet 1b is bent downward, with a configuration corresponding to the recess 3 of mattress base 2 thus formed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a structure of a water bag for a water pine tress and a method of manufacturing the same.

[Conventional technology and problems]

The waterbed and waterpine tress are assembled together with a waterbag seated on a support and surrounded by a flexible or rigid frame.

Large water level and small water level water bags are used. Water bags with a small water level are used in so-called lightweight water pine tresses.

In the case of this type of water bag, which has a small water level and is placed in a recess provided at the top of a mattress base made of foamed plastic or foamed rubber, when a load is applied to the top of the water bag, the head side of the water bag Folding and wrinkles are likely to occur at the edges of both ends on the foot side. This is due to the fact that the edges of the water bag do not have a washing load and therefore a large volume of water that forces the bag into frictional contact with the top surface portion of the mattress base around the recess. In this way, the edges of the water bag are pulled down into the water bag immediately upon loading, resulting in the wrinkle formation described above. For such loads, diagonal folding occurs from the edges of the waterbag at the foot and head ends, and the folding continues to bend the waterbag material with the rippling of the water within the waterbag during use of the bag. . This repeated flexing associated with tensile loads on the water bag results in material failure and water leakage.

[Object and structure of the invention]

It is an object of the invention to provide a water bag in which the above-mentioned disadvantages are substantially reduced or eliminated, and this object is characterized by the features of the invention set out in the characterizing part of the independent claim 1 below as well as the dependent claims below. This is achieved by

Furthermore, the invention also relates to a method for making such a water bag, which method is further achieved by the features set out in the independent method claim below as well as in the dependent claims that follow.

According to the present invention, wrinkles and
The reduction in folding style is achieved by making the top and bottom of the water bag consist of two sheets interconnected by welding or gluing along the lateral edges; The sheet forms a reinforced frame-like edge around the water bag,
This edge portion is configured to maintain contact with the top surface portion of the mattress base around the depression of the mattress base. In this way, a welded frame-like edge portion is formed around the side edges of the water bag, thereby reinforcing the side edges of the water bag (towards the recess and the top surface of the mattress base). As a result, the formation of creases and folds at the top of the water bag is reduced and the risk of material breakage is reduced.

Such welding around the edge of the top of the waterbag may be done, for example, in the case of current systems made from sleeve-shaped material with a longitudinal weld and two transverse welds at the head and foot ends of the waterbag. It can be carried out on water bags. In constructing a new water bag, the bag is made from two sheets welded together as described above and in claim 1 below. A flexible, waterproof, and more preferably weldable sheet material is assembled around the entire side edge, such as by downward welding. The top sheet may be planar, whereas the bottom sheet may be planar or may be in deep drawn form by preliminary vacuum forming to form the downwardly curved bottom as described above, or the bottom sheet may be provided with the desired concave shape to obtain the bottom sheet. Add shape by cutting corners.

To achieve a better grip between the mattress base and the frame edge surrounding the water bag, the frame edge is designed to be wider so that it hangs down along the side of the mattress base when in use. The frame portions may be welded together such that all of the frame portions together form an enclosure surrounding the sides of the mattress base. To achieve a further improved grip between the mattress base and the frame portion of the bag, the frame portion is folded under the mattress base and converged by welding the corners to hold the water bag in position on the mattress base. It is possible to lengthen the frame portion further to significantly reduce folding of the top when the water bag is loaded.

As mentioned above, the top and bottom sheets are used in the fabrication of the water bag, and the top and bottom sheets are joined together by upward welding and/or lap welding at their opposite longitudinal sides and at the head and foot ends. Welded to form a reinforced frame-like edge. By using either a top sheet or a bottom sheet that extends beyond the other sheets, said wide frame portion is folded and welded further below the mattress base to form said frame enclosure surrounding the sides of the mattress base. It is possible to provide and obtain a convergence form.

Next, embodiments of the present invention will be described below with reference to the drawings.

〔Example〕

As shown in FIG. 1, a water bag for a water pine tress is formed with a flat top part 1a and finally a bottom part 1b which is curved downward. The water bag is placed in the recess 3 in the mattress base 2 as shown in Figure 2.
The top portion 2a is placed in contact with the recess 3, and the bottom and side portions 1c are arranged in the illustrated positions.

As shown in FIG. 1, when a load P is applied, the top of the water bag has wrinkles that extend outward from the edge of the water bag at both ends of the head when the bag 1 is placed on the mattress base 2. and diagonal folds are formed. In the case of underwater ripples, the top 1a and edge 1c of the water bag as well as partially adjacent parts of the bottom 1b are subjected to repetitive movements, which together with tensile loads on the material cause material breakage and water leakage.

To reduce the risk of this folding occurring, the water bag 1 is formed with a slightly rigid frame-like edge 4 around the top sheet la' as shown in FIG.
is obtained when welded to the bottom sheet 1b', the top and bottom sheets 1a1b' forming the above-mentioned stronger frame 4 in the weld area. This formed frame-like edge 4 is shown in FIG. The top sheet 1a' is preferably flat, whereas the bottom sheet 1b' is bent longitudinally and laterally downwards to obtain a shape corresponding to the depression 3 of the mattress base 2. This bottom sheet 1
The design of b' can be achieved by deep drawing in the case of vacuum forming, or the above shape can be applied to the bottom sheet 1b'.
A corner cut 1c is provided to form a corner cut 1c. If, for example, the corner cut 1c at the leg end of the water bag or the corner cut 1c at the head end of the water bag
With only a small distance between c and c, non-parallel side edges are achieved, as shown in FIG. Such a water bag design, together with the anti-centric design of the recesses 3 of the mattress base 2, reduces the volume of the water bag 1 and thus results in a lighter water mattress.

The frame-like edges 4 of the water bag 1 are formed by opposing frame portions 4 at the head and leg ends of the water bag, as shown in FIG.
The widths of a and 4b may be extended, and if necessary, both sides may be extended in the longitudinal direction as shown in FIG. 7, or the entire edges may be extended as shown in FIGS. 8 and 9. The width may be extended as shown in FIG.

If, for example, the wide frame parts 4a, 4bs, if necessary 4c, 4d, or the whole wide frame part are folded between the mattress base and the frame in the bed in which the mattress base 2 is installed, the frame parts It is tightly clamped between the mattress base and the bed frame, which provides good stability on the mattress base and reduced folding at the lateral edges of the water bag.

By closing the gaps between the frame portions 4a to 4d in FIGS. 8 and 9 in the folding process and joining the frame portions by welding as shown in FIG. 10, the frame enclosure 5 covers the side surface 2b of the mattress base 2. formed to surround. The flap A formed during welding is removed during the welding process. A good form fit for the water bag 1 on the mattress base 2 as well as a good grip between the mattress base and the water bag is thus achieved. Particularly if the water pine tress has to be used in the head without side frame pieces, and in order to further achieve stability of the water bag on the mattress base 2, the frame casing 5 continues to be fitted with the water pine tress as shown in FIG. It goes down below 2. In this way, the lower part 4a' of the frame casing 5
4d' are folded inward by 90° and welded together at the corners to form a converging portion 5a forming a frame along the lower edge area of the mattress base 2. When the water pine tress is in use, the weight of the water pine tress, including the water bag filled with water, the mattress base and the user's weight, forces the lower part, i.e. the converging portion 5a of the frame casing, towards the foundation, which causes Frame casing 5 and therefore frame-shaped edge 4 of the water bag
and the water bag 1 itself is held in place within the recess 3 of the mattress base 2.

Top sheet la' and bottom sheet 1 of water bag 1
The joining of b' can be carried out in many different ways and by various welding. Different properties are achieved by selecting different weld points between the top and bottom sheets.

In FIG. 12, a top sheet 1a' is shown which is wider than the bottom sheet 1b'. In this example, bottom sheet 1
b' is welded to the underside of the top sheet 1a' by downward welding. In FIG. 12b, the bottom sheet 1b' is wider than the top sheet la'. Here the top sheet is welded to the bottom sheet by a lap weld 7. This means that the longitudinal edges of the water bag 1 must be welded before the transverse welds are made at the ends of the head and legs of the water bag.

Figure 12c is the same as Figure 12a, but the bottom sheet 1b'
This shows that the top part 1a' can be welded to the top part 1a' by lap welding 7.

Figure 12d shows the same lap weld 7 as in Figure 12b moved further down to the bottom of the water bag to accommodate a mattress base with generally vertical recessed sides.

[Brief explanation of the drawing]

Figure 1 shows a loaded water bag with the above-described creases and creases formed on the top surface and edges; Figure 2 shows a mattress base for use with the water bag; and Figure 3 shows the top surface of the water bag. FIG. 4 shows the water bag of the present invention before the seat and bottom sheet are welded together, FIG. 4 is a side view of the same bag in the welded state, and FIG. 5 shows the water bag having non-parallel longitudinal edges. Figure 6 is a perspective view of a water bag with extending parts at both ends of the head and legs; Figure 7 shows a water bag with extended frame parts on two opposite edges; 8 and 9 are perspective views of a water bag having a wide enclosing frame-like edge portion and FIG. 9 a bendable lateral edge; FIG. 10 is a perspective view of a water bag having a wide frame portion; FIG. FIG. 11 is a perspective view of a water bag formed by folding in the frame, cutting the corners into a torch shape, and removing a portion of the corner flaps; FIG. FIG. 12 is a perspective view from below of a water bag that can be used to accommodate various embodiments of connections between the top and bottom sheets of the water bag. DESCRIPTION OF SYMBOLS 1... Water bag, 2... Mattress base, 3... Hollow, 1a... Flat top part, 1b... Bottom part, 1c... Edge part, 2a... Top surface part, la / , 1 b/ ...2 sheets, 4.
... Reinforced frame-like edge portions, 4a, 4b; 4c, 4d-' one opposing frame portion, 5... Frame casing, 2b... Side surfaces, 4a'-4d'... Lower portions of frame casing, 5a... convergence part.

Claims (12)

[Claims] (1) The structure of a water bag for a water mattress has a mattress base (2) made of a flexible material such as foamed plastic or foamed rubber, and the mattress base has a top surface, at least in a full state, downwardly. A recess (3) is provided for receiving a water bag (1) designed with a curved bottom (1b) and a flat top (1a), and an edge portion (1c) of said water bag is provided.
) is in contact with the top part (2a) of the mattress base (2) around the recess (3). Two sheets (1a', 1b') joined by welding or gluing along the edges
around the water bag (1), the reinforcing frame-like edge portion (4) having a reinforced frame-shaped edge portion (4) having A structure of a water bag (1) for a water mattress, characterized in that it is formed as follows. (2) said frame-like edge portion (4) is connected to both sheets (1);
a', 1b')
Structure according to claim 1, characterized in that it is reinforced by two flexible layers. (3) A structure according to claim 1 or 2, in which the frame-like edge portion (4) extends to the side edges of the mattress base (2). (4) Structure according to one of claims 1 to 3, characterized in that the inner corners of the frame-like edge portion (4) are rounded. (5) at least two opposing frame portions (4a, 4b; 4c, 4d) of said frame-like portion (4) extend beyond the side edges of the mattress base (2), and in the position for use the mattress base Side (2b) of (2)
5. A structure according to claim 3 or 4, characterized in that the structure depends along. (6) that the depending frame parts (4a to 4d) of said frame-like edge part (4) are joined at the side edges of said parts to form a frame casing (5) for the sides of the mattress base (2); Structure according to claim 5 characterized. (7) according to claim 6, characterized in that the depending frame parts (4a-4d), i.e. the frame casing (5), are longer than the thickness of the mattress base (2) to be folded under the mattress base (2); structure. (8) Lower part of frame casing (5) (4a'~
4d') is folded 90 degrees and the frame casing (
5) are joined at the corners of the mattress base (2) in use.
The focusing part (
Claim 7, characterized in that it forms 5a)
Structure by terms. (9) A method for manufacturing a water bag according to any one of claims 1 to 8, comprising the top and bottom sheets (1a', 1b') of the water bag (1).
) are joined by welding along their opposite longitudinal side edge parts, and at the head and legs are joined and reinforced by flat and/or lap welding and if necessary by glue gluing. ) A method for producing a water bag, characterized by forming a water bag. (10) The hanging frame parts (4a to 4d) overlap at the side edges, and the frame casing (5)
All extra flaps (A) that occur to form the
10. A method according to claim 9, characterized in that the downward welding is carried out simultaneously with the removal of the . (11) Lower part (4a') of frame casing (5)
~4d') are folded inwards by 90° and welded at the corners to form a convergence (5a) of the frame casing (5), said frame casing extending inwardly below the bottom of the mattress base in the position of use. , water bag (
11. A method according to claim 10, characterized in that 1) is firmly held in place in the recess (3) of the mattress base (2). (12) Two sheets are used, one larger than the other, which are joined by welding such that the larger sheet extends outwardly beyond the smaller sheet, and the larger sheet (1a', 1b') frame part (4a to 4d)
is characterized in that the frame casing (5) can be folded in to form its convergence (5a) if necessary and extend outwardly beyond the welded frame-like edge part (4) to be welded. A method according to any one of claims 9 to 11.