WO1991010387A1 - Pocket-spring mattress - Google Patents

Abstract

In a pocket-spring mattress with a plurality of connected, encapsulated helical springs (1), each helical spring is arranged in a sealed pocket (4) made of nonwoven, woven fabric, plastic (5) or the like. The sealed pockets are arranged in strip form one behind the other in one direction and interconnected by parallel tapes at right angles to this direction. To obtain strip-shaped fastening of the adjacent rows so that the adjacent pockets are connected to each other not only at separate points but in at least strip or ribbon-shaped regions, without using strip- or ribbon-shaped elements of plastic or foam material, the mutually parallel tapes of the adjacent rows (2) are interconnected by curable PUR foam material (6) which is applied in the form of a strip with or without breaks lengthwise along the rows of pockets.

Description

 Pocket spring mattress

The invention relates to a pocket spring core mattress with a plurality of coherent, encapsulated coil springs, each coil spring being arranged in a closed pocket made of nonwoven fabric, fabric, plastic or the like, the closed pockets being arranged in a belt-like manner in a direction and connected to one another transversely thereto with bands arranged in parallel are.

The invention further relates to a method for producing such a mattress.

The encapsulated coil springs can have different shapes, for example they can be designed as cylinder springs, barrel springs or also as waist springs. Such pocket spring mattresses are coherent construction elements from encapsulated coil springs, which are used as a component for a complete mattress, which is correspondingly completed by cushion pads and covers. A pocket spring mattress is known for example from EP 0 154 076 A2.

Ribbons or rows are formed from closed pockets, a coil spring being accommodated in each pocket. The individual departments are / each formed by a seam parallel to the longitudinal central axis of the coil spring next to the coil springs. The upper and lower ends are also formed by corresponding seams running in the longitudinal direction of the row. Non-woven material, fabric, plastic or the like can be considered as the starting material for the pocket material.

Here, the tapes or rows are connected to each other transversely to the tape or row direction in that an adhesive is applied to a tangential line of the pocket of a row and the bags of the adjacent row are pressed against it, so that an adhesive connection between the individual rows is produced . In this way, a pocket spring mattress can be produced, in which the individual springs are arranged in rows and columns running at right angles to one another. In any case, the adjacent rows must be pressed on until the adhesive has set. The connection areas (adhesive connection points) are spatially very small areas, in particular when barrel springs are used instead of cylinder springs.

Another pocket spring core mattress is known from DE 37 28 148 C2, in which a connecting wall made of elastic material is arranged between two adjacent bands in order to simplify the manufacture and to eliminate the disadvantages which are caused by the shape of the respective coil springs. which is glued to the fabric that forms the pockets. In this case, however, it is first necessary to produce connecting walls made of foam and then to glue them to the one row of pockets by means of adhesive and to glue the parallel row of another pocket arrangement by means of a further adhesive connection.

Another pocket spring mattress is known from DE 37 38 272 A1, in which a strip part extending in the longitudinal direction of the rows is provided between each adjacent row of the bag, to which the two rows of bags are fastened. The strip part can be made of plastic and attached to the pockets by gluing.

Here, too, a strip part must first be manufactured and, in the subsequent manufacture of the pocket spring mattress, first glued to one row, after which the other row, which is parallel to it, can be glued to this strip.

Proceeding from this prior art, the object of the invention is to create a pocket spring mattress which, without a strip-shaped or band-shaped plastic or foam element, nevertheless enables strip-like fastening of the rows of a pocket spring mattress adjacent to one another, not only individual ones Points, but at least strip or band-shaped areas of the adjacent pockets are connected to one another.

To solve this problem it is proposed that the mutually parallel bands of the adjacent rows are connected to one another by curable PUR foam material which is applied in the form of a strip with or without interruptions over the length of the row of pockets. This design combines the advantages which are achieved in the prior art by the direct bonding of the rows to one another or by the indirect bonding by means of material strips arranged in between. The production is namely very simple in that it does not require the production of an additional strip or band-shaped part, because the foam material can be applied before it is cured and the connection is produced by curing the foam material itself. This arrangement also ensures that a connection between the adjacent rows is not made in a point-like manner in a few tangential areas, but rather over the entire course of the foam strip, with slight interruptions, in addition, due to the foaming material existing after application between the adjacent rows Cavities are at least approximately filled.

Depending on the setting of the foam material, use with coarse fabrics or fine nonwovens is possible, the viscosity of the foam material ensuring that the foam material does not enter the space delimited by the pocket, which may result in surface damage to the inside spring in the pocket. A preferred further development is seen in the fact that a one-component foam is used as the PUR foam material.

In particular, the use of pre-reacted

One-component foam is advantageous because it reacts and cures extremely quickly, so that the adjacent rows can be joined very quickly to form a firm bond.

A possible variant is that conventional foam is used as the PUR foam material.

Such assembly foams are known in the prior art when using buildings.

Alternatively, it is also possible that a two-component foam is used as the PUR foam material.

However, if possible, this two-component foam must be set so that it reacts very quickly, so that there are no long waiting times until the connection between the adjacent rows is established. A particularly preferred embodiment is seen in the fact that the PUR foam material is arranged in a strip-like manner between the adjacent rows, and the space between the adjacent rows in the area of the strip is filling.

On the one hand, this arrangement is conducive to the use of the mattress on both sides, since the strip-like arrangement of the PUR foam material, in particular in the middle of the height of the rows of springs, promotes freedom of movement and the point elasticity of the spring core mattress.

In addition, this training is particularly beneficial when transporting such pocket spring mattresses in the form of rolls, since the connection in the form of the PUR foam material is only insignificantly stressed when the pocket spring mattress is rolled up. This rolling up usually takes place in such a way that the pocket spring core mattress is guided through a roller-like feed means, by means of which the pocket spring core mattress is pressed flat and then rolled up into a roll, so that it can be transported in a space-saving manner.

The noise that may still arise when using the mattress can be adjusted by setting the PUR foam material accordingly, i.e. can be positively influenced by adding plasticizers and / or stabilizers.

An additional advantage that results from the teaching according to the invention is that the user, before finally completing the mattress with covering material and the like, can compensate for any imperfections in the area of the adjacent rows fastened by using a Spray can or similar PUR foam material is added at appropriate points, whereby the possibly incomplete connection can be subsequently completed and repaired.

It is also possible to produce not only basic rectangular mattress shapes, but also any shapes, for example round or S-shaped shapes. In addition, the arrangement of the rows of springs with rows and columns arranged at right angles to one another or also nested, ie offset arrangement of the springs, with respect to one another is possible. The PUR foam material is characterized by the fact that it has almost no ability to absorb moisture, which is conducive to use. In addition, a certain stiffening effect is achieved in particular when the PUR foam material is arranged in strips and in the middle of the relative height of the mattress between the adjacent rows. When the spring core mattress is loaded, an elastic deformation of the spring above and below the foam strip can take place, corresponding to the spring constant, and when the mattress is subjected to very high loads, the foam material develops an additional stiffening effect, so that the spring resistance was overall is initially linear over height and then progressively increases.

A preferred method for producing a pocket spring mattress of the type described above is that applied to the bag material along a row of PUR foam in statu nascendi, the following row is pressed against the PUR foam layer and held in a pressure position until the PUR foam has hardened .

It is particularly preferred that the rows with horizontally oriented spring center axes are fed to one another and pressed vertically onto one another.

This arrangement ensures that the foam material, which is initially applied in a viscous form, cannot flow away from the desired locations, but rather remains in them according to the position of the rows. Appropriate quantity measurement of the foam material to be dispensed also ensures that when the adjacent rows are pressed together, the cavities in the course of the foam strip between the adjacent rows are largely or almost completely filled.

The invention is explained in more detail below using an exemplary embodiment. It shows:

1 shows a pocket spring mattress in cross section;

2 likewise shows a top view in two embodiments. The pocket spring mattress consists of a plurality of coil springs 1, in the embodiment example cylindrical springs, which are combined in rows 2 and columns 3. A mattress part formed in this way is completed in the later complete construction of the mattress by an edging as well as protective and covering materials. The individual springs 1 are each inserted in pockets 4, the pockets being able to be made of non-woven fabric 5, for example. The

In principle, pockets are formed by two strips of fabric which run parallel to one another and which have vertical connection points in the form of seams or the like at regular intervals, with loss prevention for the

Springs 1 the pockets can still be sewn on the top and bottom. The connection can also be made by gluing, welding or other suitable connecting means. The adjacent rows 2 of a plurality of pockets are then connected to one another. For this purpose, a layer of curing PUR foam material 6 is applied to a row 2, namely in viscous or liquid form.

The foam material 6 can have the shape of a continuous strip, as can be seen in particular from FIG. 1, but it is also possible to provide a plurality of points in line form to form a connecting strip. The foam material, which is applied in statu nascendi, then begins to foam up and harden, the next row 2 being pressed as immediately as possible against the first row covered with foam, so that the connection between the adjacent strips 2 is produced by the foam material 6. If the foam material 6 is appropriately dimensioned, the result is that the cavities remaining between the adjacent rows 2 are completely or almost completely filled. This creates an intimate connection between the adjacent rows, but is only seen in the central area with respect to the height of the strips 2.

As can be seen in particular from FIG. 2, the arrangement of the adjacent strips 2 axially parallel (drawing figure 2 on the left) or also nested (drawing figure 2 on the right) is possible. The design according to the invention simplifies production on the one hand and the end product has been improved, with both the transportability and the usability of the pocket spring mattress being improved.

The invention is not limited to the exemplary embodiment, but is variable in many ways within the scope of the disclosure.

Claims

Claims 1. Pocket spring mattress with a plurality of coherent, encapsulated helical springs, each helical spring being arranged in a closed pocket made of nonwoven, fabric, plastic or the like, the closed pockets arranged in a band-like manner in a direction and connected to one another transversely therewith with bands arranged in parallel are characterized in that the mutually parallel bands of the adjacent rows (2) are connected to one another by hardenable PUR foam material (6) which is applied in the form of a strip with or without interruptions over the length of the pocket row. 2. pocket spring mattress according to claim 1, characterized in that a one-component foam is used as the PUR foam material (6). 3. pocket spring mattress according to claim 2, characterized in that the usual foam is used as PUR foam material (6). Pocket spring mattress according to claim 1, characterized in that a two-component foam is used as the PUR foam material (6). 5. pocket spring mattress according to one of claims 1 to 4, characterized in that the PUR foam material (6) strip-like between the adjacent rows (2), the space between the adjacent rows (2) is arranged filling in the region of the strip. 6. A method for producing a pocket spring core mattress according to one of claims 1 to 5, characterized in that on the pocket material applied along a row of PUR foam in statu nascendi, the following row is pressed onto the PUR foam layer and held in a pressure position until the PUR foam has hardened. A process for producing a pocket spring core mattress according to claim 6, characterized in that the rows with horizontally oriented spring center axes are fed to one another and are pressed vertically onto one another.