ES2688358T3 - Spring string - Google Patents

Abstract

A string of helical springs (12, 13, 14) housed parallel to each other in individual retaining bags (6) formed between two skirts folded one on top of the other of an elongated flexible fabric band (8) and delimited by tie lines (9, 10) that support the two skirts with each other and that comprise transverse lines of linkage (9) parallel to the longitudinal axes of the coil springs (2) and a longitudinal line of linkage (10) opposite and substantially parallel to the longitudinal fold zone (11) of the two skirts, according to which each bag (6) contains a helical spring (2) constituted from two spring parts (12, 13) connected in series with each other by at least one Spiral of smaller diameter (14), each transverse line of linkage (9) is divided, in an area between two adjacent bags (6) and in correspondence with each spiral of smaller diameter (14), in two parts interrelated by two lines. Link lines (17) spaced apart from each other to define a closed and elongated contour parallel to the transverse line of linkage (9) and, between the two link lines (17), is formed, by removal of fabric material, a emptying (18) in the form of an elongated window parallel to the transverse line of linkage (9).

Description

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DESCRIPTION

Spring string

The present invention relates to a string of helical springs housed in individual retaining bags and which is intended for the preparation of pocket spring suspensions for bed mattresses.

Figure 1 depicts a known suspension 1 of pocket springs 2 for bed mattress constituted from a plurality of parallel strings 3, 4, 5 of springs 2 respectively housed in individual bags 6. A string 3, 4, 5 of springs in bags are attached to each adjacent string by lines of adhesive 7 extended on the external tangential surfaces and arched in mutual contact of the bags 6. As shown in Figure 2, which shows an elevation view of a part of a string 3 of pocket springs, the adhesive lines 7 which allow a bag 6 of the string 3 to be attached to an adjacent bag 6 of the adjacent string 4 may be constituted by two parallel adhesive bands located at a certain distance from the other and extended over the arched outer face of the bag 6 perpendicular to the longitudinal direction of the spring 2 housed in that bag.

The individual bags 6 of a string 3, 4, 5 within each of which a spring 2 is housed are formed between two skirts folded on top of each other by an elongated and heat-weldable flexible web and are delimited by heat welding lines 9 transverse to the band 8, located between the adjacent springs 2 and parallel to the longitudinal direction of each spring, and a longitudinal heat weld line 10 opposite and substantially parallel to the longitudinal fold zone 11 of the two skirts of the band 8.

In this way, the successive transverse welding lines 9 run straight across the entire width of the string of the string 3, 4, 5 and are located at a certain distance from each other in order to define the width of each housing bag 6 of a spring 2 and the longitudinal welding line 10 defines the height of each bag.

FR 2861270 in the name of the applicant firm describes a suspension of pocket springs for bed mattresses comprising a plurality of coil spring strings in bags, assembled to each other as described above. According to this known suspension, each bag of a string contains two coiled coil springs interrelated in series by one or several central turns of smaller diameter.

However, this known suspension has the disadvantages that, when a load is applied on the pairs of crowded helical springs respectively housed in the holding bags of the strings, each pair of springs is not effectively held within the corresponding bag when the two This couple's springs work vertically to compression or expansion under this load. Thus, each pair of series springs housed in a bag can be disposed obliquely inside the bag and hooked with another pair of series springs housed in an adjacent bag until causing the suspension to sink and / or generate an unpleasant suspension noise , then detrimental to the comfort of the mattress that includes such a suspension.

The present invention aims to alleviate the aforementioned drawbacks of known suspensions.

For this purpose, the invention rests on a string of helical springs housed parallel to each other in individual retaining bags formed between two skirts folded one on top of the other of an elongated flexible web and delimited by tie lines that support one with the other two skirts and comprising transverse link lines parallel to the longitudinal axes of the coil springs and a longitudinal line of opposite link and substantially parallel to the longitudinal fold zone of the two skirts, string according to which each bag contains a spring helical constituted from two spring parts connected in series with each other by at least one spiral of smaller diameter, each transverse line of linkage is divided, in an area between two adjacent bags and in correspondence with each spiral of smaller diameter, in two parts interrelated by two spaced link lines a on the other, in order to define a closed and elongated contour parallel to the transverse line of linkage and, between the two lines of linkage, a window-shaped hollow is formed by withdrawal of fabric material parallel to the transverse line of linkage.

Preferably, the two tie lines are substantially arched and of opposite convexities, and the emptying is approximately oval.

According to an embodiment of the invention, each transverse link line is divided towards the longitudinal link line into two oblique lines of linkage that define an open V-shape in the opposite direction to the fold zone of the two skirts, a V-shaped cut is made by removing material from the fabric part located between the two branches of the V-shape of the two oblique lines to give the portions of ends of the bags a substantially conical shape of housing parts of smaller diameter ends of the spring parts located on the same side in relation to the smaller diameter turns of the

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springs in bags.

Preferably, according to this embodiment, the said parts of springs located on the same side in relation to the turns of smaller diameter are crammed and the parts of springs located on the opposite side in relation to the turns of smaller diameter are frustoconical whose major bases are supported in the fold zone of the two skirts.

According to another embodiment of the invention, each transverse link line is divided in opposition to the longitudinal link line into two oblique link lines that define an open V-shape towards the fold zone of the two skirts, and a V-shaped cut is made by removing material from the fabric part located between the two branches of the V-shape of the two oblique lines to give the portions of ends of the bags a substantially conical shape of housing parts of smaller diameter ends of the parts of springs located on the same opposite side in relation to the smaller diameter turns of the springs in bags.

According to this variant embodiment, the parts of springs located on the two opposite sides in relation to the turns of smaller diameter are crammed.

In accordance with yet another variant embodiment of the invention, the transverse link lines located on both sides of the closed contour link lines are parallel to each other to give the end portions of the bags a substantially cylindrical shape, and because each spring housed in a bag is noticeably diabolic.

In accordance with yet another embodiment of the invention, the transverse link lines located on both sides of the closed contour link lines are parallel to each other to give the end portions of the bags a substantially cylindrical shape, and Because each spring housed in a bag is noticeably shaped like an hourglass.

Preferably, each turn of smaller diameter is a central turn and each emptying is located halfway between two adjacent bags.

As a variant, each spiral of smaller diameter is offset between the two spring parts of a bag.

Preferably, the web of fabric is made of a heat-weldable material and the transverse and longitudinal lines of linkage are discontinuous or continuous heat-weld lines.

The invention also concerns a suspension of pocket springs for a bed mattress, comprising several interconnected parallel strings of springs in bags and which is characterized in that each string of springs in bags is as described above.

Finally, the invention concerns a bed mattress intended to be placed on a bed base and comprising an internal suspension of pocket springs that includes several interrelated strings of springs in bags and which is characterized in that each string is one of those according to which the bags from the string they comprise truncated conical springs in the lower part of the mattress intended to rest on the bed base by means of their major bases and, in the upper part, crammed springs.

The invention will be better understood and other purposes, characteristics, details and advantages thereof will be more clearly revealed in the course of the subsequent explanatory description made with reference to the accompanying drawings which, given by way of example only, illustrate two embodiments of the invention, and in which:

Figure 1 is an elevation view of several parallel strings of pocket springs, attached to each other to determine a bed mattress suspension according to the prior art;

Figure 2 is an elevation view according to arrow II of Figure 1 of a string with bags that respectively enclose crowded springs;

Figure 3 is an elevational view of a part of a pocket spring string according to a first embodiment of the invention;

Figure 4 is an elevational view of a pocket string in bags according to a second embodiment of the invention;

Figure 5 is a perspective view showing two strings of springs in bags, attached to each other, each string being identical to the string of Figure 4;

Figure 6 is an elevational view of a pocket spring in bags according to a third embodiment of the invention; Y

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Figure 7 is an elevational view of a pocket string in bags according to a fourth embodiment of the invention.

The different components or elements of the strings of Figures 3 to 5 identical or similar to those of Figures 1 and 2 bear the same references.

Referring first to Figure 3, the string 3 of bagged springs 2 is manufactured by the known method consisting, first, of inserting the axially compressed springs 2 between two overlapping skirts of an elongated web of heat sealable fabric in positions or locations spaced longitudinally on the band and then thermally weld the two skirts to each other according to the weld lines 9 transverse to the band 8 and arranged between successive compressed springs 2 and a heat weld line 10 running substantially parallel to the area of longitudinal fold 11 of the skirts, in order to form a retention bag 6 of each spring. After the conformation of these bags, the springs 2 are rotated inside the bags so that they expand so that their longitudinal axes are transverse to the longitudinal fold zone 11 and, consequently, parallel to the transverse heat welding lines 9 .

The nonwoven fabric material of the band 8 is flexible and the heat welding lines 9, 10 are obtained by ultrasound.

Adjacent springs of springs 2 in bags are interrelated by dashed adhesive lines 7 as described at the beginning of the description or continuous according to the longitudinal direction of the springs, to determine a suspension of pocket springs of a bed mattress.

According to the preferred embodiment of the invention represented in Figure 3, each bag 6 of a string 3 encloses a helical compression spring 2 comprising two spring parts 12, 13 connected in series with one another by one or more central windings of smaller diameter 14 and respectively constituted by a part of a cramped upper spring 12 and a part of a lower conical spring 13 arranged on both sides of the spiral of smaller diameter 14.

The parts of crammed springs 12 are called superiors because they have to be located substantially in the upper half of a mattress, with the end turns of smaller diameter of these parts arranged under the mattress rest area. The parts of truncated conical springs 13 are called lower because they have to be located substantially in the lower half of the mattress, with their extreme turns forming the major bases of these parts of springs supported in the fold zone 11 and intended for rest on the upper face of a box spring S.

In fact, pocket springs in bags that have the configuration shown in Figure 3 are intended for making mattresses of relatively large thickness and are not intended to be turned around by their user, that is, they have no more than a resting face, the one under which the crowded docks 12 are located.

The two parts of springs 12, 13 of a double spring 2 housed in the same bag 6 can have the same stiffness, although they can have different stiffnesses if it is intended to create different comfort combinations between different mattress locations. This difference in stiffness can be obtained by increasing or decreasing the number of turns or windings of one and / or other of the two parts of series springs 12, 13 of each bag 6.

Figure 3 also shows that each transverse weld line 9 is divided towards the longitudinal line 10 into two oblique heat weld lines 15 defining an open V-shape in the opposite direction to the fold zone 11 or to the line 10, in order to reduce the width of each retaining bag 6 of a cramped upper spring part 12 in the area of this bag where the upper end part of smaller diameter of the turns of the crammed spring part 12 is housed.

The two oblique heat welding lines 15 located on both sides of a crowded spring part 12 have an inclination and a height from their rectilinear cross-welding line 9 such that they form a part of the upper bags in an approximately truncated conical shape that allows enclose, with virtually no play, the approximately concave upper end portion of smaller diameter of the crammed spring part 12.

Figure 3 also shows that the string 3 of pocket springs is provided with cuts 16 made by removing material from the band 8 between the branches of the different pairs of oblique lines 15 to configure each cut 16 substantially V-shaped embedded in the V-conjugated shape defined by two oblique heat welding lines 15 associated with a transverse heat welding line 9.

Two successive cuts 16 of the band 8 define an approximately truncated conical portion of each other that allows axial compression or a sinking of at least the corresponding part of the cramped spring 12 without causing a collapse of the portions of neighboring crammed springs 12 due to the absence of fabric between two

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portions of adjacent frustoconical bags. Thus, the cuts 16 provide the springs 2 of the string 3 with more independence than those of a traditional string.

Figure 3 shows, finally, that each transverse line 9 is divided or split, in an area located halfway between two adjacent bags 6 and in correspondence with one or several central turns 14, in two interrelated parts by two heat welding lines substantially arches 17 mutually facing each other and of opposite convexities perpendicular to the transverse line 9 to define an approximately oval contour. A recess 18 is formed between the two substantially arcuate tie lines, by removal of fabric material, so that this recess has approximately an elongated oval shape parallel to the transverse line 9. The remaining and rectilinear bottom of each transverse line 9 located under the corresponding emptying 18 runs to the fold zone 11. Thus, each emptying 18 is located halfway between two adjacent bags 6.

The presence of the arcuate link lines 17 and the emptyings 18 at medium height between the adjacent bags 6 and in correspondence with one or several central turns 14 allows, on the one hand, to effectively maintain the spring parts 12, 13 of the springs 2 within their respective bags so that they can work vertically under compression when a load is applied to them and prevent the spring parts 12, 13 from being engaged by engaging with the other neighboring spring parts 12, 13 causing, either a sinking of the string, or noise and, on the other hand, increase the criterion of independence of rest of a mattress provided with strings conforming to that of Figure 3, with respect to a mattress provided with traditional strings of packed pocket springs.

The voids 18 between the adjacent bags 6 of a string may be made by any known means, for example by ultrasound, by a cutting and punching machine or with a die cutter.

A mattress made from a suspension of strings, according to each of them to the string of figure 3, provides better comfort due to greater elasticity with respect to the previous mattresses, and also provides greater firmness of the base of the mattress resting on the bed base, due to the presence of the parts of the conical lower spring springs, and this due to the greater durability of the mattress.

According to the second embodiment of the invention represented in Figures 4 and 5, each double spring 2 housed in a bag 6 of the pocket 3, 4 of pocket springs comprises respectively, on both sides of one or several central turns of smaller diameter 14, a top spring part 12 crammed and a bottom spring part 13 also crammed, the two parts of crowded springs 12, 13 being identical.

As with the first embodiment, each string 2, 3 of a suspension includes a succession of pairs of oblique heat welding lines 15 and of cuts 16 formed between the pairs of heat welding lines 16 so that the upper end portions of the bags 6 have an approximately truncated conical shape that allows each of them to receive the approximately truncated conical upper end part of a corresponding part of the cramped spring 12. Additionally, each string 3, 4 also includes some drains 18 between adjacent pouches approximately oval and made between pairs of arcuate welding lines 17. Figure 5 shows that each recess 18 can resemble a rhombus shape comparable to an approximately oval shape, for example in a rugby ball.

Additionally, each lower transverse heat weld line 9 is divided in opposition to the longitudinal link line 10, as opposed to the upper heat transverse line 9 of two oblique upper link lines 15, into two other oblique lines of link 15 which define a V-shape open towards the fold zone 11 of the two skirts of the band 8, and a V-shaped bottom cut 16 is made, by removing material from the fabric part located between the two branches of the shape in V of the two lower oblique lines 15, to confer to each end portion of a bag 6 a substantially conical form of accommodation of an end portion of the smaller diameter turns of the crowded lower spring part 13.

According to another variant not shown, the recess 18 can be formed between two parallel lines of link 17 spaced from each other perpendicular to the corresponding transverse line of link 9 to constitute a rectangular window elongated parallel to line 9 and of the same internal contour that the external contour defined by the two lines 17. Of course, each pair of link lines 17 can define any other form of oval or rectangular contour, from the moment they present a closed and elongated contour in a direction parallel to the line transverse of link 9, the two link lines 17 being symmetrical in relation to this direction.

According to a variant embodiment not shown, each turn of smaller diameter 14, instead of being located between means of the two parts of springs 12, 13, may be offset or offset between these two parts. For example, for the two embodiments of Figures 3, 4, each turn of smaller diameter may be offset upwards with respect to these figures, being further away from the fold zone 11, that is, each upper spring part 12 will be shorter than the lower spring part 13 in an uncompressed position of the spring 2. This offset or offset configuration is also applicable in case of more than one smaller diameter loop 14 linking the two parts 12, 13 of each spring 2.

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In this way, a mattress made from an internal suspension of pocket springs in bags each of which was identical to the strings in Figures 4 and 5 will have the same advantageous characteristics as those of the mattress equipped with spring strings in bags, each identical to the string of figure 3, with the only difference that the mattress base that rests on a bed base will not have such a strong firmness, because the lower springs 13 are crowded instead of being conical trunk In fact, the spring strings in bags identical to that of Figure 4 are intended for mattresses that can be turned over.

In fact, the mattress made according to figure 3 will benefit from a relatively flexible receiving part by the upper spring parts 12 and a relatively firm supporting part by the lower spring parts 13, while the mattress in figure 4 you will benefit from identical and balanced reception and support parts by identical upper and lower 13 spring parts.

Each string of Figure 4 allows to keep effectively a double crammed spring inside each bag without the risk of being disposed through when a load is applied vertically and, also, allows to increase the independence of rest of a mattress equipped with such strings, with respect to strings whose bags contain two crowded springs.

In accordance with another variant of embodiment not shown, it is also possible to obtain a mattress of greater or lesser elasticity according to the qualities of interest by arranging within the mattress several strings identical to that of Figure 3 and several other strings identical to that of the figure 4.

According to the embodiment shown in Figure 6, the transverse link lines 9 located on both sides of the closed contour link lines 17 are straight and parallel to each other to confer to the end portions of the bags 6 a substantially cylindrical shape, so that each bag 6 can accommodate a spring 2 substantially in the shape of a diameter.

In accordance with the embodiment shown in Figure 7, as in Figure 6, the transverse link lines 9 located on both sides of the closed contour link lines 17 are rectilinear and parallel to each other for confer a substantially cylindrical shape to the end portions of the bags 6. According to this embodiment, each spring 2 housed in a bag 6 is substantially in the form of an hourglass, that is, the two spring parts 12, 13 located on both sides of the third central part of the smaller diameter spring 14 are cylindrical.

Of course, each turn of smaller diameter 14 of a spring 2, instead of being located between the two spring parts 12, 13 as shown in Figures 6 and 7, may be offset or offset between these two parts, as It is described with reference to the other preceding embodiments.

In addition, each string of Figure 6 or 7 allows a spring in diabolo or hourglass to be effectively maintained within each bag without the risk of being disposed through when a load is applied vertically, while meeting the criteria of independence.

Although the invention has been described with reference to strings whose bags are formed from transverse and longitudinal lines of heat welding, it is assumed that this is applicable in strips whose transverse and longitudinal lines are made by sewing.

Claims (13)

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String of helical springs (12, 13, 14) housed parallel to each other in individual retaining bags (6) formed between two skirts folded one on top of the other of an elongated flexible fabric band (8) and delimited by lines of linkage (9, 10) that support the two skirts with one another and that comprise transverse lines of linkage (9) parallel to the longitudinal axes of the coil springs (2) and a longitudinal line of linkage (10) opposite and substantially parallel to the longitudinal fold zone (11) of the two skirts, according to which each bag (6) contains a helical spring (2) constituted from two spring parts (12, 13) connected in series with each other by means of the minus one spiral of smaller diameter (14), each transverse line of linkage (9) is divided, in an area located between two adjacent bags (6) and in correspondence with each spiral of smaller diameter (14), in two parts interrelated by two Link lines (17) spaced apart from one another to define a closed and elongated contour parallel to the transverse line of link (9) and, between the two link lines (17), is formed, by removal of fabric material, a emptying (18) in the form of an elongated window parallel to the transverse line of linkage (9). 2. String according to claim 1, characterized in that the two link lines (17) are substantially arcuate and have opposite convexities, and the emptying (18) is approximately oval. 3. String according to claim 1 or 2, characterized in that each transverse line of linkage (9) is divided towards the longitudinal line of linkage (10) into two oblique lines of linkage (15) defining a V-shaped shape open in the direction opposite the fold zone (11) of the two skirts, a V-shaped cut (16) is made by removing material from the fabric part located between the two branches of the V-shape of the two oblique lines ( 15) to confer on the end portions of the bags (6) a substantially conical form of housing of smaller diameter end portions of the spring parts (12) located on the same side relative to the smaller diameter turns ( 14) of the springs in bags. 4. String according to claim 3, characterized in that the said parts of springs (12) located on the same side in relation to the turns of smaller diameter (14) are crammed and the parts of springs (13) located on the opposite side in relation to the turns of smaller diameter (14) they are frustoconical, whose major bases are supported in the zone of crease (11) of the two skirts. 5. String according to one of claims 1 to 3, characterized in that each transverse line of linkage (9) is divided in opposition to the longitudinal line of linkage (10) into two oblique lines of linkage (17) defining a shape in V open towards the fold zone (11) of the two skirts, and a V-shaped cut (16) is made by removing material from the fabric part located between the two branches of the V-shape of the two lines oblique (17) to confer to the end portions of the bags (6) a substantially conical form of housing parts of smaller diameter ends of the spring parts (13) located on the same opposite side relative to the turns of smaller diameter (14) of the springs in bags (2). 6. String according to claim 5, characterized in that the parts of springs (12, 13) located on the two opposite sides relative to the turns of smaller diameter (14) are crammed. 7. String according to claim 1 or 2, characterized in that the transverse link lines (9) located on both sides of the closed contour link lines (17) are parallel to each other to confer to the end portions of the bags (6) a substantially cylindrical shape, and by which each spring (2) housed in a bag (6) is substantially in the form of a diameter. 8. String according to claim 1 or 2, characterized in that the transverse link lines (9) located on both sides of the closed contour link lines (17) are parallel to each other to confer to the end portions of the bags (6) a substantially cylindrical shape, and because each spring (2) housed in a bag (6) is substantially hourglass shaped. 9. String according to one of the preceding claims, characterized in that each turn of smaller diameter (14) is a central turn and each drain (18) is located halfway between two adjacent bags (6). 10. String according to one of claims 1 to 9, characterized in that each turn of smaller diameter (14) is offset between the two parts of springs (12, 13) of a bag (6). 11. String according to one of the preceding claims, characterized in that the web of fabric (8) is made of a heat-weldable material and the transverse lines (9) and longitudinal lines (10) of the bond are discontinuous or continuous heat-welding lines. 12. Suspension of pocket springs for bed mattress, comprising several interconnected parallel strings (3, 4, 5) of springs in bags, characterized in that each string (3, 4, 5) of springs in bags is in accordance with any one of claims 1 to 11. 13. Bed mattress intended to sit on a bed base and comprising an internal suspension of pocket springs that includes several interconnected strings (3, 4, 5) of springs in bags, characterized in that each string (3, 4, 5) is according to claim 4 so that the truncated conical springs (13) constitute the lower part of the mattress intended to rest on the bed base (S) by means of the major bases of the 5 truncated conical springs (13).