MXPA95003428A - Method and apparatus for conditioning the springs in spiral embolsa - Google Patents

Abstract

A method and apparatus for manufacturing mattresses, comprising the steps for forming a coiled spring with wire, conditioning said spring in a spiral and reducing the stresses that are formed, placing said spring in spiral inside the bags to create elongated chains of coiled springs, joining the aforementioned elongated chains to create intern spring structures

Description

IN SPIRAL EMBOLSADOS.

Field of the Invention This invention relates in general to beds, namely mattresses and box springs. Above all, this invention relates to the stress-relieving treatment of spiral springs for placing them in bagging material and subsequently using them in mattresses and box springs.

Description of the related art It is known how to make individual coil springs with wire and to combine said coil springs in a single unit of internal springs, which can be used as a mattress or box spring.

It is also known how to provide individual "bagged" turns and assemble said individual turns in internal spring structures, to later upholster them and convert them into mattresses or box springs.

An example of a method and apparatus for mounting said coil springs is shown in U.S. Patent No. 4,439,977 to Stumpf, which is included herein by reference. Methods and apparatuses for combining bundles of bundled loops in a chain or series of turns, to be installed in internal spring units within a mattress assembly, as illustrated in U.S. Patent Nos. 4,578,834 and 4,986,518, are also included. in the present as a reference.

Although the mentioned systems have several advantages over previous structures, there is still a need to improve them. For example, when the loops are compressed to be bagged, as exhibited in U.S. Patent No. 4,439,977, the loops may tend to "deform," resulting in a disadvantageous permanent loss of height or weight. There are also disadvantages because the wire tends to suffer certain stresses during formation, which can cause residual failures in the coil springs.

Accordingly, the industry recognized the need to provide springs that do not exhibit stress-induced problems, including disadvantageous "deformation" conditions.

The general treatment of heat in spiral springs is known. For example, the art is known to provide internal "compression" spring structures, and then to place said internal "compression" spring structures in an oven to release the tension. However, in the case of the internal spring structures of bagged turns, said structures do not lend themselves to being heated in the furnace, since, for example, the fabric of the bag or the glue joining the coiled springs will be degraded if subjected at high temperatures, as will happen with oven heating.

Accordingly, the need was recognized to provide a method and apparatus for perfecting the bagged turns and the internal spring structures made with them and the products made therewith. SUMMARY OF THE INVENTION The present invention provides bagged loops and internal spring structures made with the former, wherein coiled springs of spring loaded metal wire are heat treated or otherwise conditioned prior to placing them in cloth bags, so that the inherent residual stresses of the spring wire are reduced, so that the durability and elasticity of the spiral springs are maintained for a long time. Above all, the present invention relates to the methods and apparatus for heat treating wire-wound coil springs, and the subsequent insertion of said coil springs into bagging fabric, as do mattresses produced with these and springs. spiral made with this method.

With respect to the requirements and transformation of materials to reduce or totally eliminate the inconvenient residual stresses of the wire of a compression spiral spring, it is to be noted that said residual stresses of the wire of the compression spiral spring are generally two types, i.e. , residual stresses due to stretching the wire and residual stresses due to the formation of the wire. Both types of stress are due to the cold working of the metal in the spring wire.

With respect to the residual stresses when stretching the wire, when carbon steel wire is made to be applied in a bagged spiral spring, it is cold drawn, for example, from a 1070 high-carbon steel rod, hot-rolled, of 7/32"(0.21875") or 1/4 (0.25") in diameter, these rods are normally reduced in diameter reduction matrices, until reaching a margin of 0.068" to 0.094"in diameter. The cross section due to this cold working tension (deformation) of the wire produces accumulation and retention of different types of residual stress configuration, including longitudinal stresses (parallel to the wire axis, extendable on the wire surface and compressive in the wire axis), radial tensions (essentially perpendicular to the axis of the wire and compressive on the shaft), and tangential stresses (which follow the same configuration as the longitudinal stresses) .

With respect to the residual stresses due to the formation of turns, when a compression spiral spring is formed with the wire, some additional residual stresses are added and it is believed that they alter the residual stresses that are already present in the wire due to the stretching of the wire. wire. These additional stresses due to the formation of turns, which are due to the additional cold work, produce differential plastic strain (deformation), additional wire and the accumulation and retention resulting from other types of residual tension configurations in the wire, which includes stresses compressive residuals (in the material of the wire that is inside the mean diameter of the loop), tensile stresses (in the material of the wire that is outside the mean diameter of the loop), and torsional stresses, as the wire contained in the active turns of the spring it contains some levels of torsional residual stresses, which are due to the twisting of the wire when the helical turns of the spiral compression wire were formed.

It has been known that the combination of the stretching of the wire and the residual stresses due to the formation of turns, mentioned above, present problems with respect to the performance of compression spiral springs, free-space retention, load transport, resistance to deformation and resistance to fatigue. Therefore, it is necessary to release these inconvenient tensions.

In order to achieve the release of the tension of the spiral compression springs in the bagged turn products, the mechanical plastic deformation can be selectively applied to offer stress balance. However, preferably, the heat is applied selectively to achieve the stress balance. These cooling processes can be followed, to allow the secure insertion of the spiral compression spring into the fabric bag.

The reduction of the residual stress to the total release of the inconvenient stresses, inclusive, can be achieved by several methods, including, but not limited to, the selective cold mechanical work of the wire in the spring (such as blasting), treatment with ultrasound, laser heating, heating in a resistance furnace, induction heating, heating by electric resistance, heating by hot air blast, or radiant heat heating. However, regardless of the method used, methods that involve the application of heat are preferable to other alternatives. In addition, no matter what method is used, a specific temperature and time of heating must be applied to the spring that it experiences. release of tension and, subsequently, cooling must be performed at a specific temperature so that the spiral spring can be inserted into a cloth bag, without damaging the bag and fabric of the bag.

Now we will deal with a preferred process to release the tension in spiral springs, and it should be noted that time is established in intervals, and in the case described, a single time interval is equal to 700 or 800 milliseconds. In the preferred process, the spring temperature rises in the range of 420 ° F to 1333 ° F; but it is preferable that it is closer to a narrower margin of 500-700oF. All within a single time interval is not sufficient to complete the penetration of heat and, therefore, to complete the release of undue stresses, then, a sufficient number of additional time intervals is needed. In this case, the means to achieve the function of the process is to use 2, 3, 4, 5 ... N time intervals. In order for each time interval to be carried out without slowing down the production rate of the machine, additional conditioning chambers and the adequate amount of space in line to accommodate these chambers will simply be needed.

Potential methods to achieve the cooling function include, but are not limited to, cooling by recirculating oil bath, cooling by recirculating water, cooling by combined air / water mist, cooling by vortexes of compressed air, cooling by air cooled under pressure, and cooling by air under pressure at room temperature. Air-pressure cooling is the preferred method of cooling. However, no matter what cooling method is used, a specific and determined cooling temperature and time must be applied to the spring that has experienced stress release, and the cooling of the spring must be carried out below a specific temperature, so that You can insert the spiral spring into a cloth bag without damaging the bag and the fabric of the bag.

A preferred time / temperature for the cooling process would be to reduce the spring to a temperature in the range of a single time interval of 0-73OoF. If a time interval is not sufficient to achieve cooling to the desired temperature, then a sufficient number of additional time intervals may be required. In this case, the means to achieve this function of the process is to use 2, 3, 4, 5 ... N time intervals. In order for each time interval to be carried out without slowing the production rate of the machine, additional conditioning chambers and the adequate amount of row space to accommodate these chambers will simply be required.

As it is possible to understand, it is necessary to follow the processes detailed above, inserting the spring released from tensions and cooled in the cloth bag.

Accordingly, one of the purposes of the present invention is to provide an improved structure of bags turns for use in internal spring structures.

Another purpose of the present invention is to provide an improved structure of internal springs for use in mattresses and box springs.

Another purpose of the present invention is to provide an improved method and apparatus for providing bagged spiral springs, wherein the coil springs are conditioned to release the stresses, before being placed in the bags.

Another purpose of the present invention is to provide an improved method and apparatus for manufacturing bagged spiral springs, whose operation, construction and maintenance are economical.

These and other objects, features and advantages of the present invention will become apparent upon reading the following detailed description of the preferred embodiments of the invention, together with the drawings and appended claims.

BRIEF DESCRIPTION OF THE DRAWINGS Figures 1A-1C are general views of the apparatus embodying the present invention for use in the processes of the present invention; Figure IA is a plan view of the inventive apparatus. Figure IB is a front elevational view of the apparatus of Figure IA, and Figure IC is a side elevational view of the apparatus.

Figures 2A-2C are views of the apparatus of the present invention, Figures 1A-1C further include a heat-inducing station used to heat the coiled spring, in accordance with this invention.

Figures 3A-3C are views of the apparatus of the present invention. said Figures 1A-1C further include a radiant heat heating station which is used to heat the spiral spring, in accordance with this invention.

Figure 4 is a cross-sectional view of a radiant heat heating assembly for use in the heating station illustrated in Figure 3.

Figures 5A-5C are views of the apparatus of the present invention, as illustrated in Figures 1A-1C, which further include an electrical resistance heating station for heating the spiral spring, in accordance with this invention.

Figures 6A-6C are views of the apparatus of this invention as illustrated in Figures 1A-1C, which further include a pressurized air heating station, which is used to heat a spiral spring according to this invention.

Figure 7 is an isolated view of an apparatus for adjusting and welding the bagged turns, which is used in the present invention.

Figure 8 is a pictorial view illustrating the operation of the forming tube, used according to the method of the present invention.

Figure 9 is a side elevation view illustrating the operation of the guide rods, in accordance with the present invention.

Fig. 10 is a schematic view illustrating the coil springs of the present invention, inserted in a defined bag of fabric, forming part of an elongated chain of said coil springs bagged for use in the production of the internal springs structure .

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS.

With respect to the figures, in which like numbers correspond to identical articles in the different views, figures 1A-1C illustrating the apparatus 10 according to the present invention, including a bag material feeding station 22, which feeds the material for bags 13 of a roll 24 of synthetic or natural fabric along a path 25, around the floating rollers 26, to a turnaround carousel 40 (the cover is not shown in Figures 1A-1C) that is assembled so that it has a rotating movement and includes 39 cavities inside it. The carousel 40 is positioned to accept coil springs 12 in the insertion position of the cavity 41, of a reel head 50. These spiral springs 12 are then conditioned, as described later in this application, and the springs in FIG. Conditioned spirals 12 are removed from the carousel 40 and deposited in the position of exit from the cavity 42 in a station to form bags 30. A chain of spirally wound bags 55 is then formed from these springs 12 deposited, conditioned. A computer 11 is used to control the operation of this process.

It will be understood that the turnaround carousel 40 rotates periodically intermittently, and the carousel 40 is adjusted periodically in each cycle of the machine. In the carousel 40 illustrated in FIGS. 1A-1C, eight cavities 39 are present, so that the carousel is adjusted eight times or "cycles" for each revolution of the carousel. In the carousels 40 shown in Figures 2A-2C 3A-3C, 5A-5C and 6A-6C, there are twelve cavities, so that these carousels are adjusted twelve times or "cycles" for each complete revolution of the carousel. The cavities 39 of the conditioning carousel 40 can be lined with thermal insulation material, if desired.

Now, with reference to FIGS. 2A-2C, there is illustrated an apparatus 60 for conditioning coil springs, which includes devices for the thermal induction conditioning of spiral springs 12.

As in figure 1, conditioned coil springs 12 of a winder head 50 are provided. In the course 25 of the winder head to the spinning carousel 40, as illustrated in FIGS. 2A-2C, each spiral spring 12 is stopped during one cycle, at least, in an induction heating station or chamber 61. Within each heating station 61 there is an induction heating coil. The induction coil 43 comes with high frequency current from a separate power source 62. The high frequency current from the heating coil 43 produces a fluctuating magnetic field, which induces the current flow in each spiral spring 12 to the to be transported by station 61. The induced current provides rapid heating to each coiled spring 12, within the appropriate temperature range of about 500oF to about 700oF; it is preferable about 6OO0F.

After they are heated by induction, the coil springs 12 are sequentially placed in the conditioning carousel 40, which in the figures 2A-2C appears with a cover. A cooling duct 63 is provided to channel the inlet and outlet air of the cooling station 64. As described below in detail, the duct 63 allows the cooling air to be directed through one or more cavities 39 in the carousel 40, so that when a spiral spring 12 in particular is adjusted together with the carousel 40, the spiral spring 12 is cooled for at least one cycle. If more than one cavity is cooled as shown in Figures 2A-2C, the direction of cooling air alternates for each cavity 39, by virtue of the looping or backward configuration of piping 63, which is best illustrated in Figures 2C, 3C and 5C.

In each induction heating station 61, the coil springs 12 are passed axially through a path that passes essentially through the center of the induction coil 43. The induction coil 43 is configured to allow the coil springs 12 to pass through. its center without interference. In a preferred configuration of the induction coil 43 as best illustrated in FIG. 2A, the induction coil 43 has a throat dimension of about 5"within the diameter, has a length of about 8", and has an inside diameter of about 2". and 6 turns.

One method for placing coil springs 12 within the induction heating station 61 is using non-conducting guide rods 71 (see FIGS. 4 and 9), which hold the coil springs 12 in place during the heating process. The guide rods 71 offer a radial guidance of the coil springs as they travel along a longitudinal axis through the induction coil 43 and the station 61. As in the case of the radiant heat heating which will be described later, the springs in FIG. The spiral 12 can be transferred during its travel through the station 61 by means of an air jet provided by the blower element 91.

Now, with respect to Figures 3A-3C, there is illustrated an apparatus 70 for conditioning spiral springs 12, which uses radiant heat to condition the spiral springs 12.

In the path 25 of the furling head 40 to the winding carousel 40, the spiral springs 12 enter at least one radiant heat heating chamber 74, which includes radiant heat ceramic heaters 72 powered by electric power ( see also figure 4). The heaters 72 convert the electrical energy into radiant energy, at a frequency that produces effective heat transfer to the coil springs 12. One or more radiant chambers 74 can be used in line to achieve the desired production rate, by heating the spring 12 from about 500oF to about 700oF, preferably around 6OOOF.

As illustrated in Figure 4, the coil springs 12 are conditioned by the radiant heat treatment, using the radiant heaters 72. As can be seen, three heaters 72 each include ceramic, radiant and elongate heating elements 73 , which look towards the axis A, which is preferably the longitudinal axis of a spiral spring 12 which is heating. The length of the element 73 is preferably approximate to the equivalent of the longest spring that is contemplated in the process. Sylvania sells the appropriate heaters 72 for use here as model No. 06612.

In a manner similar to that described above with respect to the induction heat of the coil springs 12, insulating guide rods as shown in Figs. 4 and 9 can be used to move the coil springs 12 through the heating chamber 74. Furthermore, if desired, the aforementioned air jet transfer, which provides the blower member 91, can be used.

After the spiral springs 12 are heated, they are directed inside the conditioning carousel to reheat them, cool them and then place them in the bagging cloth 13.

In figures 5A-5C, there is illustrated an apparatus 80 for conditioning the coil springs 12, which uses copper or other material contact plates 83, between which the coil springs 12 can be placed for heat conditioning the springs in spiral 12.

In the path of the furling head 50 to the winding carousel 40, each spiral spring 12 is stopped within a resistance heating chamber 81, and the contact plates 83 are pressed to contact the opposite ends of each coiled spring 12. The plates 83 connect the coil springs 12 in an output circuit of a high-current, low-voltage power transformer 82. When the contact is fully established, the power supply is activated for a short time time, usually 200 milliseconds or less. Then, the high stream will flow directly through each spiral spring 12 and heat the spiral spring 12 from about 500oF to 700oF, preferably at about 600oF.

As stated above, the conditioned coil springs 12 are now sent to the carousel 40 and then placed in the bagging material 13.

Now, with respect to Figures 6A-6C, there is also illustrated an apparatus 90 for conditioning coil springs, which includes the use of heated air for heat conditioning the coil springs 12.

In an embodiment of the present invention, after the coil springs 12 exit the head of the reel 50, the ambient air of a blower 86 is heated to at least 700 ° F with a heater 85, such as a resistance heater electrical, in a closed air stream. The coil springs 12 are then transported inside the conditioning carousel 40. In the structure illustrated, the heat channel 84 guides the heated air of the air heater 85 to the undercuts of at least one cavity 39 of the carousel 40, so as to heat of about 500oF and 700oF, preferably about 6OO0F, the spiral springs that are there.

In a preferred embodiment of this invention, the "reheating" of the coil springs is achieved while the freshly heated coil springs are in the carousel, but are not cooling. The term "reheat" is used to describe the transfer of heat from the outer skin of the wire to the center of the wire, i.e., the range of the temperature gradients to be reduced across the cross section of the wire fibers. In general, in the preferred embodiments, it is made by allowing the coil springs to rest within a particular cavity without the heat being transferred by external means to the cavity or the cavity. For example, in the configuration of Figures 2A-2C, the coil springs 12 can be reheated up to 6 cycles before they are cooled.

In accordance with the present invention, it is preferable that after heating a spiral spring 12 to the appropriate temperature, which may range from about 400 ° F to about 20 ° F, but will normally be in the range of 500 to 700 ° F, using the preferred techniques, as illustrated in Figures 2-6 of the present, and as described in accordance with the detailed description of the invention, the spiral spring 12 is cooled to a temperature that allows the spiral spring 12 to be placed in the material of bagged 13, without causing damage to the structure of the fabric. Therefore, in the preferred embodiments of this invention where natural fabrics are used as bagging material 13, the coil springs 12 must be cooled to a temperature not exceeding about 15 ° F, before they are put into the bagging material 13. For some synthetic fabrics, the cooling temperatures of the spiral spring can be considerably higher than those of natural fabrics and can range up to a temperature of 700oF.

The cooling of coil springs 12 can be carried out using a variety of cooling techniques, including the use of pressurized air circulation, oil bath recirculation, water recirculation, combined air / water mist, cooling by vortexes of compressed air, cooling by pressurized air and the like.

For example, the cooling of the coil springs 12 can be conveniently achieved using pressurized ambient air, for example, at a water column pressure of 10 inches and then funneled through a series of chambers in the turnaround carousel 40. At high speed, the high volume air that is directed through the wires of the coiled springs and by virtue of the relatively low mass (usually 30 grams) of the coil springs 12, cooling can be achieved in four or fewer cameras. In the configuration shown in Fig. 2A-2C, the air is directed through four individual cavities 39, and the air flow is redirected in the opposite direction of each successive cavity.

Now we will talk about figures 7 and 8 to understand the apparatus and process for inserting spiral springs 12 into bags defined by the bagging material 13. In general, it should be understood that the process includes the steps of forming an elongated cloth tube 107 , inserting a spiral spring 12 into the tube, and forming a bag 123 around a spiral spring 12, for example, joining, with ultrasonic welding, two seams 108 transverse to the longitudinal axis of the tube 108 - a seam 108 on each side of the spiral spring 12 - for inserting the spiral spring 12 into the fabric bag 123. By using two pairs of jaws 102, 103, 104 and 105, respectively, serving to keep the coil springs 12 and the fabric 13 in place its place during the welding process, and that serve to remove from the road the coiled and finished spiral springs 124, so that the process is repeated.

As shown in figures 7 and 8, the cloth 13 is passed over a separating roller 27 (see also figure IB), essentially flat. Then, the fabric is "gathered" around the outside of a forming tube 110 suspended by two rods 111, and including a front mouth clamp or forming ring 109. The fabric 13 is pulled through a tube 110, to create a cloth tube 107 in the outlet or rear mouth of the forming tube 110, and the free ends of the fabric overlap in a flat seam in the 108.

The clamp or forming ring 109 is attached to the front mouth of the forming tube and gently guides the fabric 13. The fabric 13 can be "picked up" to be fused by guide rollers (not shown), and may be of the spike-like type. or deformable as is known in the art.

As seen above, the coil springs 12 are cooled in the conditioning carousel 40. At the end of each adjusted rotation of the carousel 40, a conditioned spiral spring 12 will be released, as if falling under the influence of gravity, by the outlet hole 120 in the cover of the carousel 40. The spiral spring 12 of metal lands on the magnet 121, which holds it in place, while a pair of lateral compression ears, synchronized 114 (only one is shown in the figure 8) come together to compress and center the loop, while it is on top of the magnet. An alternative thrust member 112, actuated by means known in the art, pushes the spring out of the bearing shaped magnet and into the neck of the cloth tube 107, which is in the neck of the forming tube 110.

The coil springs 12 are retained within the forming tubes 110 by friction between the ends of the coil springs 12 and the fabric 13. The fabric 13 is in frictional contact with the vertical, inwardly oriented side surfaces 113, of the tube 110. The pusher 112 pushes a specific spiral spring 12 into place, just after a tension force pulled or adjusted down a spiral spring 12 in the cloth tube 107. As will be seen later, this tension force is due to a gripping action of the jaws 102-105, placed on the back of the forming tube.

There are two sets of jaws 102-105, a front set and a back set, which work in synchronized form. The front jaw set includes a front upper jaw 102 and a lower front jaw 103, which operate in a synchronized manner. The rear jaw set is composed of a rear upper jaw 104 and a lower rear jaw 105, which operate in a synchronized manner.

The front set of jaws 102, 103, is combined to grip a particular spiral spring 12, and the rear set of jaws 104, 105 is combined to grip another spiral spring 12 between several coil springs downstream (three in the embodiment illustrated).

The jaws are similar, each having the members of the right and left side wall mounted on opposite sides of a central "half pipe". When two jaws of a set come together as shown in figure 7, the two "half tubes" come together to, in effect, put "as with a bucket of jaws" a spring inside the fabric. This has an advantageous alignment effect. The set of rear jaws provides additional tension force during adjustment.

After the jaws grip a pair of coil springs 12 in the positions shown in Figure 7, the ultrasonic welding block 100, which comprises a peak 99, moves upwards, so that the overlapping tube of the fabric of bagging 13 is "pinched" between the spout 99 and the anvil bar 101 rigidly attached to the front lip of the upper front jaw 102. The anvil bar 101 is "slotted" so as to provide an intermittent transverse weld. The peak 99 is then activated by ultrasound, so that the peak 99 and the rod 101 combine to form a transverse, intermittent thermal weld which, when repeated, forms pockets 123 into which the coil springs 12 are inserted, for forming the spirally wound bagged products 124 with the coil springs 12 in the bags 123, formed of the bag material 13, as illustrated in Figure 10.

After the welding process, the block 100 is removed to its retracted position, as shown in Figure 7. An alternative support (not shown), which holds the front and rear jaws 102, 103, 104 and 105, is adjust by the appropriate means, such as a pneumatic cylinder, so that it pulls the entire chain of springs 55 close to a diameter of a distance loop. In order to repeat the process, the jaws 102-105 return to grasp the next available spiral spring.

According to a preferred embodiment, the steps of a) grip, b) welding, c) adjustment, d) release and e) return, are performed in that order and in a single global adaptation cycle.

Although static welding is described above, it should be understood that the welding could be performed alternately "on the fly" by mounting the arm 99 on the alternative support holding the jaws 102-105, which are mounted rotatably on the support, the turning points as the "P" of figure 7.

Although this invention was described with specific details with respect to the disclosed embodiments, it will be understood that many variations and modifications may be made within the spirit and scope of the invention, as described in the appended claims.

Claims (56)

CLAIMS The following claims are made:

1. - A method for producing bagged spiral springs, for use in internal spring structures, comprising: form coil spring springs for springs at a first temperature; said spring wire has inherent residual stresses; conditioning said coil springs to a second temperature, sufficient to substantially reduce said residual stresses inherent in the spring wire of said coil springs; adjusting the temperature of coiled springs conditioned to a third temperature, sufficient to allow the insertion of said spiral springs conditioned in a cloth bag, and to spiral said springs in a cloth bag.

2. - The method of claim 1, wherein said conditioning of said spiral springs is carried out using a heating technique selected from a group, consisting of induction heating, radiant heat heating, resistance heating and heating by air under presure.

3. - The method of claim 1, wherein said second temperature, at which the heat conditioning is carried out, is within the range of about 500oF to about 700oF.

4. - The method of claim 3, wherein the second temperature is about 6OOOF.

5. - The method of claim 1, wherein said second temperature is greater than said first temperature, and said third temperature is intermediate between said first and second temperatures.

6. - The method of claim 1, wherein said coil springs can be reheated after said conditioning and before said adjustment of said third temperature.

7. - The method of claim 1, wherein said method is continuous.

8. - The method of claim 7, wherein said third temperature is adjusted essentially instantaneously with the completion of the conditioning of said spiral springs.

9. - A method for manufacturing continuous chains of coiled springs, bagged for use in internal spring structures, which includes the following steps: a) forming a coiled spring with wire, so that a part of said spiral spring is at the first temperature; b) raising the temperature of said spiral spring, so that said portion of said spiral spring is at a second temperature higher than the first temperature, to reduce the formation of stresses that are created in that part of said spiral spring during step "a"; c) reducing the temperature of said spiral spring, so that said portion of said spiral spring is at a third temperature lower than said second temperature, but higher than said first temperature; d) placing said spiral spring inside a bag defined with fabric, to create elongated chains of coiled spiral springs; Y e) joining said elongated springs to create said internal spring structures.

10. - The method as claimed in claim 9, wherein in step "b" said spiral springs are heated by passing them through an induction coil activated with electricity.

11. - The method as claimed in claim 10, wherein during step "d", said spiral springs are bagged by spiraling the said springs into a cloth tube, and making said bag with two transverse thermal welds through the tube, on each side of each of said spiral springs; said thermal welds must be essentially parallel to the longitudinal axis of said spiral spring.

The method as claimed in claim 9, wherein during step "b", said spiral springs are heated by passing them along at least one radiant heat element.

13. - The method as claimed in claim 12, wherein during step "b", said coil springs are heated by passing them axially along an essentially straight path, which is approximately the focal center of three elements of heating placed around and intended for that route.

14. - The method as claimed in claim 13, wherein during step "d", said coil springs are bagged by inserting said spiral springs into a cloth tube and making said bag with two transverse thermal welds through the tube, on each side of each of said spiral springs; said thermal solders are essentially parallel to the longitudinal axis of said spiral spring.

15. - The method as claimed in claim 9, wherein during step "b", said spiral springs are heated by air under pressure to a temperature higher than said second temperature for said spiral springs.

16. - The method as claimed in claim 15, wherein during step "d", said coil springs are bagged by placing said spiral springs into a cloth tube and making said bag with two welds transversely through of the tube on each side of each of said spiral springs; said thermal solders are essentially parallel to the longitudinal axis of said spiral spring.

17. - The method as claimed in claim 9, wherein during step "b", said coil springs are heated by selectively passing an electric current through them.

18. - The method as claimed in claim 9, wherein during step "b", said coil springs are heated by selectively contacting the ends of each of said coil springs with a contact plate and passing an electric current through the spiral springs.

19. - The method as claimed in claim 15, wherein during step "d", said coiled springs are bagged by spiraling the said springs into a cloth tube, and making a bag with two thermal welds in shape crosswise through the tube, on each side of each of the mentioned coil springs; said thermal welds are essentially parallel to the longitudinal axis of said spiral spring.

20. - The method as claimed in claim 9, wherein during step "d", said coil springs are bagged by putting said spiral springs into a cloth tube, and making the said bag with two thermal welds in transverse shape through the tube, on each side of each of said spiral springs; said thermal welds are essentially parallel to the longitudinal axis of said spiral spring.

21. - The method as claimed in claim 9, wherein during step "d", said coil springs are bagged by spiraling said springs into an elongated layer of fabric, folded essentially at half its length, and creating and providing individual transverse welds through the coated cloth, and a longitudinal weld along said coated cloth.

22. - A method for manufacturing continuous chains of bagged springs for use in internal spring structures, comprising the following steps: a) forming a coiled spring with wire, so that a portion of said spiral spring is at a first temperature; b) raising the temperature of said spiral spring, so that said portion of said spiral spring is at a second temperature higher than said first temperature, to reduce the formation of stresses that are created in that portion of said spring during the step "a"; c) inserting said spiral spring into a conditioning carousel, having at least one cavity that accepts turns, so that said spiral spring is placed inside said cavity; d) reducing the temperature of said spring while it is inside said cavity, so that said portion of said spiral spring is at a third temperature lower than said second temperature, but higher than said first temperature; e) removing said spring from said cavity; f) placing said spiral spring inside a cloth bag to create elongated chains of spiral springs bagged in cloth; Y g) joining said elongated chains to create the mentioned structures of internal springs.

23. - The method as claimed in claim 22, wherein during step "d", the air at a temperature lower than said second temperature, exits under pressure to cool said coil springs.

24. The method as claimed in claim 23, wherein during step "b", said spiral springs are heated by selectively passing an electric current through them.

25. The method as claimed in claim 23, wherein during step "b", said spiral springs are heated by passing them through an induction coil activated with electricity.

26. - The method as claimed in claim 23, wherein during step "b", said spiral springs are heated by passing them along at least one radiant heat element.

27. - The method as claimed in the claim. 22, wherein during step "b", said spiral springs are heated by selectively passing an electric current therethrough.

28. - The method as claimed in claim 22, wherein during step "b", said spiral springs are heated by passing them through an induction coil activated with electricity.

29. - The method as claimed in claim 22, wherein during step "b", said coiled springs are heated by passing them together with at least one radiant heat element.

30. - A method for manufacturing continuous chains of bagged turns to use internal spring structures, comprising the following steps: a) forming a coiled spring with wire, so that a portion of said spiral wire is at a first temperature; b) raising the temperature of said spiral spring, so that said portion of said spiral spring is at a second temperature higher than the first mentioned temperature, to reduce the formation of stresses that are created in that part of said spring during step "a". c) inserting said spiral spring into a conditioning carousel having at least one cavity that accepts a spring, so that said spiral spring is placed inside said cavity; d) reducing the temperature of said spiral spring while it is inside said cavity, so that said portion of said spiral spring is at a third temperature lower than said second temperature, but higher than said first temperature; e) removing said spring from said cavity; f) placing said spiral spring inside the cloth bags, to create elongated chains of coiled springs in cloth bags. g) join the aforementioned chains to create the aforementioned internal springs structures.

31. - A method for manufacturing continuous chains of bagged springs for use in internal spring structures comprising the following cyclic steps: a) Form with wire at a rate of one per cycle, a spiral spring, so that a part of said spiral spring is at a first temperature. b) inserting, at a rate of one per cycle, said spiral spring in a conditioning carousel having at least one cavity that accepts turns, so that the said spiral spring is placed inside said cavity; c) raising the temperature of said spiral spring while it is in said cavity, so that said portion of said spiral spring is at a second temperature higher than said first temperature, to reduce the formation of stresses that are created in said portion of said spring during step "a". d) closing said cavity and allowing said coiled spring to remain inside said cavity and to overheat for at least one cycle; e) opening said cavity and allowing the said spiraling spring while it is inside the cavity, so that said portion of said spiral spring is at a third temperature lower than said second temperature but higher than that mentioned. first temperature; f) extracting said spiral spring from said cavity at a rate of one per cycle; g) placing said spring spirally inside cloth bags, to create elongated chains of spiral springs bagged in cloth; Y h) joining said elongated chains to create the aforementioned internal spring structures.

32. - The method as claimed in claim 31, wherein said spiral spring is cooled with pressurized air in step "e".

33. - The method as claimed in claim 31, wherein said spiral spring is heated with compressed air in step "c".

34. - A method for manufacturing continuous chains of bagged turns for use in internal spring structures, comprising the following cyclic steps: a) forming, at the rate of one per cycle, a wire spiral spring, so that a portion of said spiral spring is at the first temperature; b) raising the temperature of said spiral spring while it is inside the cavity, so that the portion of said spiral spring is at a second temperature higher than said first temperature, to reduce the formation of stresses created in said portion of said spring during step "a"; c) inserting, at the rate of one per cycle, said spiral spring in a conditioning carousel having at least one cavity that accepts springs, so that the said spiral spring is placed inside said cavity; d) closing said cavity and allowing said coiled spring to remain inside said cavity and to overheat for less during a cycle; e) opening the said cavity and lowering the temperature of said spiral spring while it is inside the cavity, so that the portion of said spiral spring is at a third temperature lower than said second temperature, but higher than the cited first temperature. f) removing said spiral spring from said cavity at a rate of one per cycle; g) placing said spiral spring inside cloth bags, to create elongated chains of spiral springs bagged in cloth; Y h) joining said elongated chains to create the mentioned constructions of internal springs.

35. - The method as claimed in claim 34, wherein said spiral spring is cooled with pressurized air in step "e".

36. - The method as claimed in claim 34, wherein said spiral spring is heated with pressurized air in step "b".

37. - A method for creating a chain of spirally wound springs, comprising the following steps: a) forming a cloth tube; b) inserting a spiral spring into said tube; c) grasping said spiral spring and said fabric with a jaw member; d) welding a transverse seam through that fabric tube to partially form a bag in said fabric and containing said spiral spring; e) adjusting said jaws - to adjust in the same way said spring and fabric; and f) releasing said jaws from said spring and fabric.

38. - The method as claimed in claim 37, wherein during step "d" said welding is made by grasping said fabric between an ultrasonic spout and an anvil attached to said jaw, and activating said ultrasonic spike to create a welded seam thermally in the aforementioned fabric.

39. - The method as claimed in claim 38, wherein during step "d", said welding terminates a bag around said spiral spring.

40. - The method as claimed in claim 37, wherein during step "d", said welding terminates a bag around said spiral spring.

41. - A method for creating a chain of spirally wound springs, comprising the following steps: a) forming a flexible cloth tube within an essentially rigid forming tube; b) inserting a first spiral spring into said cloth tube and into said forming tube, at a fixed point with respect to said forming tube, so that each of the opposite ends of said first spiral spring is biased against a layer of fabric that, in turn, is biased against the corresponding wall of said. forming tube; c) pulling and adjusting said fabric downstream of said first spiral spring, so that said spiral spring and said fabric, fit together inside said tube; Y d) inserting a second spiral spring into said fabric tube and into said forming tube, so that each of the opposite ends of said second spiral spring is biased against a layer of fabric which, in turn, is biased against the corresponding wall of said forming tube.

42. - A method for creating a chain of spirally wound springs comprising the following steps: a) forming a cloth tube; b) inserting a spiral spring into said tube; c) welding a first transverse seam to one side of said spring; d) adjusting said tube to its full length, pulling its rear end; Y e) welding a second transverse seam on the opposite side of said spiral spring.

43. An apparatus for forming coiled springs for use in internal spring structures, comprising: means for forming spring coils of springs wire, at a first temperature; that said spring wire has inherent residual stresses; means for conditioning said spiral springs at a second temperature, sufficient to reduce essentially said residual stresses inherent in the spring wire of said spiral springs; means for adjusting the temperature of coiled springs conditioned to a third temperature, sufficient to allow said coiled springs to be placed in a cloth bag; Y means for putting said springs in a spiral in a cloth bag.

44. - The apparatus of claim 43, wherein said means for conditioning said coiled springs comprises a heating device for heating said coiled springs, by a process selected from the group, consisting of induction heating, heating by radiant heat, heating by resistance and heating by air under pressure.

45. - The apparatus of claim 43, wherein said means for conditioning said springs comprises a heating device by heating the said spiral springs to said second temperature, and said second temperature being in the range of about 500oF to about 700oF. .

46. - The apparatus of claim 44, wherein said means for adjusting the temperature of the conditioned coil springs, at a third temperature, comprises a cooling device.

47. - The apparatus of claim 45, wherein said means for adjusting the temperature of the conditioned coil springs, at a third temperature, comprises a cooling device.

48. - The apparatus of claim 43, including the means for reheating the aforementioned spiral springs, after said conditioning of said spiral springs, and before adjusting said temperature to said third temperature.

49. - The apparatus of claim 43, wherein said means for adjusting the temperature of coiled springs conditioned to said third temperature, is a structured device to allow essentially instantaneous adjustment of said third temperature, finishing the conditioning of said springs spiral.

50. - Coiled spiral springs for use in internal spring structures comprising spiral springs formed with spring wire at a first temperature; said spring wire contains inherent residual stresses. The mentioned coil springs are conditioned at a second temperature, sufficient to reduce. substantially said residual stress inherent in the spring wire of said coil springs; the temperature of the conditioned spiral springs is adjusted to a third temperature, sufficient to allow said coil springs to be put into a cloth bag; and the spiral springs are put in a cloth bag.

51. - The coil springs of claim 50, wherein said spiral springs are conditioned by a heating technique selected from a group, consisting of induction heating, radiant heat heating, resistance heating and pressurized air heating .

52. - The bagged spiral springs of claim 50, wherein said temperature of said second temperature, to which said coil springs are conditioned, is in the range of about 500oF to about 700oF.

53. - The bagged spiral springs of claim 51, wherein said temperature of said spiral springs is adjusted to a third temperature with a cooling device.

54. - The bagged spiral springs of claim 51, wherein said temperature of said spiral springs is adjusted to a third temperature with a cooling device.

55. - The bagged spiral springs of claim 50, wherein said second temperature is higher than the first mentioned temperature, and said third temperature is intermediate between the first and second temperatures.

56. - The bagged spiral springs of claim 50, wherein said third temperature is adjusted essentially instantaneously, with the completion of the conditioning of the aforementioned coil springs.