DK142192B - FOOD MADRAS - Google Patents

Description

(11) PUBLICATION MANUAL 142192 DENMARK «"> in *, α. " A 47 C 27/20 '(21) Note 5855/75 (22) Filed on 26 Aug 1975 (24) Lives day 26 Aug 1975 (44) The application submitted and the writ published on 22 ββρ.19o0 DIRECTORATE OF .... ^.

PATENT AND TRADEMARKET (3 ° 5 F

Sep 5 1974, 2442528, DE

(71) METZELER SCHAUM GMBH, Donaustrasse 51, 8940 Memmingen, DE.

(72) Inventor: Herbert Ruf, Ludwigs fes 26, D-7550 Rastatt, DE.

(74) Plenipotentiary in the proceedings:

Office for Industrial Excellence v. Svend Schønnlng.

(54) Madras 8f foam plastic.

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a foam plastic mattress comprising a foam body which forms the mattress contour and provided with several recessed or cut parallel grooves, the depth of which forms a substantial portion of the foam body thickness, which grooves are separated from each other by connecting members, and has spring elements which are inserted close to each other in the grooves.

Mattresses, mattresses and foamed mattress parts are known in many different embodiments, strengths, material hardnesses and materials, such as foamed rubber, foamed polyether material and similar materials.

It is also known to provide foam mattresses with a so-called spring core. In these mattresses, the foam plastic on at least the upper and lower sides as well as on at least two opposite abutment surfaces forms a closed housing, in which in one known mattress of this type is inserted a braid of endless springs, which ensure sufficient stability in the longitudinal and transverse direction of the mattress is interconnected by coil spring threads. In other known mattresses there is arranged a so-called cylinder springs of a few adjacent cylinder springs which are covered on the upper and lower side by means of a woven material on which a foam layer is arranged.

In this case, however, the spring core must be surrounded by a frame, e.g. of band steel, and within this framework measures must be taken to prevent the individual cylinder springs from folding to the side. There are known cores with so-called waist springs, which are double-conical, springs connected via coil springs, and which, at relatively large mattress thickness, give a good spring effect, while the spring force of the springs is greatly reduced at smaller construction height. All of these mattress types are also known with various extra covers of needled horsehair, needle or woven sheep's wool and similar covers.

From usa. U.S. Patent No. 3,251,078 discloses a mattress made of two similar foamed adhesive bodies with furrow-like internal recesses in which are interconnected spring elements, each wrapped in a fabric sheath. The cavities inside the mattress formed by the recesses are surrounded by foam plastic on all sides. This mattress is relatively difficult and expensive to manufacture, as well as the closed cavities can give rise to moisture formation which can destroy the spring materials.

It is also known to use pure foam plastic bodies for mattresses, in which recesses or sac-shaped bores are distributed, spaced apart at the same distance across the mattress surface, having a diameter of several centimeters and in each of which a cylindrical spring element. After insertion of the springs, a cover plate has been adhered, preferably of the same foam plastic as the actual mattress body. In spite of the advantageous spring effect, this mattress type has also gained little recognition, as the manufacturing costs are very high and there are problems with so-called sweat formation in the mattress cavities and on the interfaces.

The mattress of the present invention is characterized in that the grooves extend over the entire width or length of the foam body and have a width approximately equal to the width of the connecting members, that the top of the foam body is covered by a foam cover plate adhered to the foam body within the region of the connecting members and peripheral regions, that the spring elements inserted into the grooves are wound as endless wire springs of a coherent spring wire piece in such a way that, together under a negligible small bias, they abut against the bottom of the furrow and the cover plate of the cover plate and are supported against lateral avoidance by the connecting parts. This results in a durable mattress which is relatively inexpensive to manufacture and which at the same time exhibits excellent lying and optimal suspension properties. This is mainly because the grooves extend over the entire width or length of the foam body and have a width approximately equal to the width of the connecting parts, whereby a single foam plate or, if applicable, of an endless foam web, can be very quickly and with the aid of simple cutting devices. manufacture two foam bodies without any material waste. The excellent reclining and optimal spring properties are due to the mattress combining the advantages of the modern foam plastic mattress with the extremely good spring properties of older mattresses built solely by springs. Due to the fact that the grooves are continuous, effective ventilation of these is ensured, so that the spring elements are protected against corrosion, while avoiding sweat formation and thus unpleasant odor formation. The special shape of the spring elements and the manufacture of endless wire springs also contribute significantly to the cheapness of the mattress. The depth of the grooves can take up a substantial part of the thickness of the foam body. For example, the foam body is 15 cm thick, the depth of the furrows can be approx. 9 to 12 cm. The width of the furrows may be about the same size as their depth, but may also be smaller or larger.

The exact complementary design of the grooves and connecting parts has, as mentioned, a decisive advantage. If a foam board of e.g. The thickness of 16 cm, it is possible to produce exactly two foam sub-bodies by means of a known cutting device, such as an electrically heated wire, by cutting the foam plate into two parts longitudinally along the lateral surfaces and over the whole width, following the contour of they wanted furrows. The foam bodies which are separated from each other by means of such sectioning are exactly complementary to each other. The sectioning can be carried out so that the uncoated bottom layer has a thickness of approx. 4 cm, while the depth of fire in the two sub-bodies becomes approx. 8 cm. In order to obtain a fully closed lying surface on the upper and lower sides, the furrowed sides of the foam bodies are covered by the foam cover plate, which may have a thickness, e.g. corresponds to the distance between the bottom of the grooves and the underside of the foam sub-body.

At the same time, the foam connection members prevent deflection of the spring elements and therefore act as further reinforcement of the good spring properties of the springs. The mattress is at the same time very flexible and in this respect is the previously known spring core mattress with foam plastic cover, but also the pure foam mattress. This high flexibility is especially important for beds with adjustable head and foot sections and is due to the fact that, in the longitudinal direction of the mattress, the spring elements do not extend across a wire connection from one spring to the next.

In particular, according to the invention, the spring elements may be coil springs and these may advantageously be double-conical.

Finally, according to the invention, at least the side surfaces of the mattress may be covered by an air-permeable cover, whereby the furrows orifices are uncovered in a simple manner without loss of ventilation ability.

The invention is explained below with reference to the drawing, in which fig. 1 shows a longitudinal section through a mattress according to the present invention; and FIG. 2 shows the mattress of FIG. 1, viewed from above with the cover plate partially removed.

The mattress shown in the drawing comprises a foam body provided with reference numeral 1 and may be made of a so-called hot foam such as polyether or of a cold foam such as polyurethane. This foam body 1 comprises several Darallelt adjacent grooves 2 which extend in the transverse direction of the mattress, the depth of which extends over a substantial part of the thickness of the foam body 1. If the height of the foam body e.g. is 12 cm, the depth of the furrow can be approx. 8 cm. The furrows 2 are separated from each other via connecting parts 3, the width of which in a preferred embodiment of the invention corresponds exactly to the width of the furrows.

Such a foam body 1 is manufactured together with an exact complementary foam sheet part, which is also useful as such a foam body, during the same cutting process of a closed foam sheet having a thickness of e.g. 16 cm. The cutting guide parallel to the longitudinal direction of the foam plate accurately follows the contour of the successively alternating connecting parts and grooves. This results in virtually no material waste. The front and rear parts 4 and 5 of the foam material can, in principle, be made wider than shown in the drawing, since within this part, which later becomes the main and foot area of the mattress, only foam material is sufficient to obtain a good overall spring effect.

The sides of the grooves and the connecting parts, respectively, can be formed slightly tapered from the top of the respective connecting part to the bottom of the corresponding groove, whereby the sectioning is somewhat simplified and the two foam bodies made during one and the same operation are more easily taken apart.

In the foam body thus produced, endless wire spring elements 6 according to the invention are now inserted, the manufacture of which is well known and requires no further illumination. These endless wire spring elements extend substantially over the entire length of the respective grooves. The individual springs lie under low bias partly against the bottom of the grooves and partly against an adhered cover plate 7. This cover plate 7 is preferably of the same foam plastic as the foam body. The way in which the adhesive takes place is known from other areas where plastic bodies are manufactured.

The single springs of the cohesive wire spring elements may take the form of cylinder springs, but also of tapered or double conical so-called waist springs.