Patent Application
20200199797
The present invention relates to a quilt, that is to say a covering made of insulation enclosed between layers, or webs of fabric, with the insulation being kept in place by lines of stitching, usually known as seams. Typically a quilt may be employed on a bed as a cover for sleeping under and, when configured in a manner that enables it to be enclosed within a removable and washable sleeve, also goes by the name of a duvet. Quilts may also be configured to lie on top of more traditional sheets and blankets and to create sleeping bags and other similar items.
The primary purpose of a quilt is to provide insulation and warmth and, thereby to help its user to maintain a suitable sleeping temperature at which they are comfortable. The degree of insulation provided by a quilt is expressed in terms of a “tog” value or rating. The tog is effectively as a consumer friendly' unit of thermal insulance per unit area developed by the Shirley Institute. 1 tog=0.1 m2K/W (K is Kelvin and W is Watts). Lightweight summer quilts typically have a tog value of 3.0-4.5; spring/autumn quilts a tog value of 7.5-10.5; and winter quilts a tog value of 12.0-13.5.
Although users can select the tog value of their quilt to suit their needs, it is a common complaint that, when two people share a duvet, they have different warmth preferences. For example, typically, a woman's comfortable sleeping temperature has been found to be greater than a man's with the consequence that women tend to want to be warmer when sleeping than men. Self-evidently, these preferences directly affect the choice of optimum tog value so that where one duvet is to be used simultaneously by two people with different warmth preferences, the outcome will inevitably be a compromise in which neither person has the optimum insulation. This can typically present a problem when a man and a woman use the same duvet and each has a different warmth preference.
Individual duvets are known in Which each has a different tog rating, with the duvets being fastenable to each other by a zip fastener or Velcro®. US2016/0270565 shows a duvet cover comprised of a base sheet and a top sheet interconnected by a peripheral stitched seam and between which a down feather sheet is retained. The loft of the down feathers in their sections is modified by applying design stitch seam patterns formed by stitching. The quilt has a central transverse section which has a design pattern having close stitch lines to compress the down feathers and thereby reducing the loft of the down and the air trapped therein to provide compressed zones of less thermal insulating efficiency. GB2558636 provides a cover for sleeping comprising two portions having different tog ratings from one another. GB2548898 also discloses a sectionalised duvet.
According to an embodiment of the present invention, there is provided a method of manufacturing a quilt comprising the steps of:
In this manner, a quilt having differing tog values in different areas may be produced using a conventional manufacturing machine and at a speed and cost which is very similar to that of a conventional quilt having only a single tog value throughout.
The first region and the second region may be formed by a multi-needle stitching machine. The multi-needle stitching machine may be arranged to form more seams, or ‘stitch lines’ in the first region than in the second region.
The method may further comprise folding and packing the quilt.
The insulating material may be carded prior to being fed between the mutually opposing faces of the webs of fabric.
The filling material may be a synthetic filling material.
The filling material may be a polyester filling material. The filling material may be at least 95% polyester, at least 90% polyester, at least 80% polyester, at least 70% polyester, at least 60% polyester, or at least 50% polyester.
The webs of fabric may each be dispensed from a roll and more preferably different webs are dispensed from distinct rolls. Preferably, the webs of fabric have the same width, with the webs being wider than the insulating material between them. The rolls are preferably offset from each other in a heightwise direction (which is transverse to both the lengthwise and widthwise directions).
The quilt may comprise or consist of an insulating or ‘filling’ material of a synthetic material. The synthetic filling material may be polyester, or at least substantially polyester. The synthetic filling material may be at least 90% polyester, at least 80% polyester, at least 70% polyester, at least 60% polyester, or at least 50% polyester. The synthetic filling material may be carded. The filling material may itself be a pre-formed quilt (preferably containing synthetic insulating material). It follows that, in such cases, the seams created during the present method may cross over, or run parallel to, existing seams in the insulating material.
Each seam compresses the filling material located directly between the first and second webs of fabric along the stitching line. The filling material is also compressed, albeit to a lesser extent, in regions immediately adjacent to each line of stitching. The compressed filling material results in less air being trapped within the filling material which decreases the insulating ability of the filling material (lower tog rating) thus keeping a user cooler. Consequently, the greater concentration of seams in the first region causes a reduction in the loft of the insulating material in that region and, thereby, reduces the tog value of that region by comparison to that of the second region. This is so even though the concentration of insulating material is uniform across both regions of the quilt (meaning that the first and second regions contain same quantity of insulating material).
It should be noted that, whereas natural filling materials, such as feather or down feather, have a tendency to displace within the quilt when used as a filling material, synthetic filling materials, such as polyester, do not display this tendency, or at least do not display it to the same degree. The inventors have appreciated that as a consequence of the lower displacement tendency of synthetic materials, the effect in terms of reduction of tog rating in the sections of higher seam density is believed to be more pronounced when the tilling material is synthetic due to the introduction of additional sewing lines (cold spots that would register a lower tog value for the same fibre filling GSM with the tog testing unit).
The tog rating of the first region may be lower than the tog rating of the second region. The quilt may comprise a 1-tog, 2-tog, 3-tog or greater variance between the tog values of the first and second regions.
The first and second regions are preferably equal in size.
Where the present invention relates to a duvet, the filling material may be of any size, including but not limited to sizes suitable for a double or twin duvet, kingsize duvet and super kingsize duvet.
Where the present invention is formed as a sleeping bag, the sleeping bag may be a double sleeping bag.
The second region of the quilt, may also comprise at least one seam, provided that the number of seams in the first region is greater than the number of seams in the second region. The seams formed in the second region may be formed in the same way, or in a different way, as the seams formed in the first region.
The first region and the second region may be substantially equal in size. It follows that it is typical that two people sharing a quilt will each make use of half of the quilt. As such, the first region may comprise about half of the total area of the quilt, and the second region may comprise about half of the total area of the quilt.
The seams may be parallel to each other.
Where the first region and/or the second region comprise multiple seams, a channel, filled with filling material, is formed between each pair of seams. A channel is also formed between the edge of the quilt and the first seam formed inwardly from such edge. There may be more channels in the first region than the second region.
The seams may be orientated equidistant apart such that the width of each channel is equal, or substantially equal.
The seams may be longitudinal relative to the length of the quilt. The seams may additionally be transverse relative to the length of the quilt. The quilt may comprise longitudinal seams and transverse seams relative to the length of the quilt.
The seams may extend from one edge of the quilt to an opposite edge of the quilt.
The quilt, may comprise a combination of lengthwise and widthwise seams, having the same or different length, relative to the length of the duvet. The quilt, may comprise seams orientated in any manner such that the seams are aesthetically pleasing for a user. The quilt, may comprise a seam orientated in a lengthwise direction and positioned centrally relative to the area of the quilt. Such a seam may be a central, longitudinal seam. Such a seam effectively defines two halves of the quilt one half being the first region and the other being the second region.
Where the present invention is formed as a duvet, the duvet may be of any size, including but not limited to, double or twin, kingsize and super kingsize.
Where the present invention is formed as a sleeping bag, the sleeping bag may be of any size, including but not limited to, standard size, standard women's size, standard men's size, extra-large women's size, extra-large men's size and double sleeping bag.
The number of seams in the first region may adhere to the formula X+1, X+2, X+3, X+4, X+5, X+6, X+7, X+8, X+9 or X+10, where X is the number of seams in the second region. The width of each channel formed by the seams may be between about 5% and 10% of the total width of the quilt; between about 10% and 15% of the total width of the quilt; between 0% and about 30% of the total width of the quilt; between about 5% and 25% of the total width of the quilt; between about 10% and 20% of the total width of the quilt; between about 12% and 18% of the total width of the quilt; or between about 14% and 16% of the total width of the quilt.
The seams may be orientated such that the channels formed each have different widths, relative to the total width of the quilt.
The seams may have the same or different stitching and therefore the same or different numbers of stitches per unit length of seam.
A further embodiment of the present invention includes an apparatus for manufacturing a quilt, comprising:
The multi-needle stitching machine may be arranged to provide a central, longitudinal seam.
The multi-needle stitching machine may he arranged to provide a greater number of seams on one side of the central, longitudinal seam than the other side of the central, longitudinal seam.
The apparatus may comprise a first roll of fabric to provide the first fabric web and a second roll of fabric to provide the second fabric web.
A further embodiment of the present invention includes a quilt comprising mutually opposing webs of fabric and a layer of insulation substantially uniformly distributed between the webs, the webs being stitched into a quilt by seams extending lengthwise, wherein the quilt has first and second regions which are spaced from each other widthwise, and the first region has a higher number of lengthwise seams than the second region.
The insulating material may be a man made material.
The insulating material may be a polyester insulating material. The insulating material may be at least 9.5% polyester, at least 90% polyester, at least 80% polyester, at least 70% polyester, at least 60% polyester, or at least 50% polyester.
The insulating material may comprise carded polyester.
There may be a 1-tog, 2-tog, 3-tog, or greater variance between the tog values of the first and second regions.
In order that the invention may be more clearly understood one or more embodiments thereof will now be described, by way of example only, with reference to the accompanying drawings, of which:
With reference to the figures, there is shown an embodiment of a method of manufacturing a quilt of the present invention for use as a duvet and two embodiments of quilts again for use as duvets, of the present invention. More particularly in one embodiment of the present invention an example will be illustrated of the manufacture of a duvet suitable for two people, in which one side of the duvet has a lower tog value than the other. Various of the embodiments will be described in conjunction with modifications, alternatives or variations thereto. It is to be understood that modifications and variations disclosed herein are not limited in their application to the embodiments in connection with which they are first described and, unless stated otherwise, any modification, alternative or variation to an embodiment can be employed with any embodiment disclosed.
Referring now to
After the webs 10, 12 have been drawn off the rolls 20, 22, an insulating material (also known as a filling material) 18 is fed in between them from a conveyor belt 24. In a preferred embodiment the insulating material 18 is inserted uniformly between the webs 10, 12. Uniform distribution is, however, not essential. For example, one alternative embodiment provides a non-uniform but regular, periodic distribution of the insulating material. Such a distribution of insulating material, being regular can, across an area which is large by comparison to the periodicity provide the same, or a very similar insulating effect to a uniform distribution. In the present embodiment uniformity is achieved in the widthwise direction by the uniform distribution of insulating material as it is fed between the webs 10, 12. Uniformity in the lengthwise direction is provided by feeding the insulating material 18 onto the conveyor belt 24 at a substantially constant rate so that the insulating material 18 is correspondingly delivered between the webs 10, 12 at a substantially constant rate.
According to the present embodiment, the insulating material comprises a carded polyester filling material which is formed of 100% polyester.
Once the Polyester fibre is inserted between the webs 10, 12 the resulting layered composite 9 created by the lamination of the two webs 10, 12 and the interstitial insulating material 18 is fed into a multi-needle quilt stitching machine 30. The stitching machine 30 stitches a plurality of seams 60 into the two webs 10, 12 thereby to fasten them together and, in so doing, to retain the insulating material 18 between them to create a quilt. In the present embodiment at least some of the seams extend lengthwise, such as for example, the seam created by the central, longitudinal seam 11. The use of lengthwise seams 60 is particularly efficient since they can be created by the use of needles (one of which 200 is illustrated in
Although the distribution of insulating material 18 is substantially uniform, it is nonetheless desired to create a duvet having two regions which each have a different tog value. In the present embodiment, the first region 40 (lower tog value) and second region 50 (higher tog value), are spaced apart widthwise and it is desired to reduce the tog value of the first region 40 relative to that of the second region 50. According to a preferred embodiment of the present invention, the tog value of the first region 40 is reduced by using additional seams in the first region 40 to compress the insulating material and, thereby, to reduce its loft and consequently introducing additional ‘cold spots’. As a result of the compression and consequent loss of loft, even though the first region contains the same amount of insulating material as the second, the tog value provided by the insulating material in the first region 40 is reduced by comparison to that in the second region 50.
In a preferred embodiment, it is desired that smaller areas within the first region 40 all have, as far as practically possible, the same tog value and that this tog value is the same as the tog value of the first region 40 as a whole. Consequently, in a preferred embodiment, the additional seams provided in the first region are evenly distributed with the result that the first region 40 has a higher number of seams per unit area across its whole area than the second region 50. In the present embodiment, this is achieved by the provision of additional lengthwise seams 60, with the result firstly that the number of seams extending lengthwise in the first region 40, per unit distance measured widthwise is greater in the first region 40 than the second region 50; and secondly that the lengthwise seams 60 in the first region 40 are evenly distributed widthwise. In the present embodiment, the greater concentration of lengthwise seams is created by the use of a correspondingly greater number of stitching needles 200 on the stitching machine 30 through which the first region of the composite 9 is fed. The additional needles 200, evenly spaced widthwise within the machine 30 above the side of the composite which will form the first region 40, create the lengthwise seams 60 as the layered composite 9 is fed through the stitching machine.
6× extra sewing channels on first region 40 on a double sized duvet with a gross weight of 1818 grams resulted in the second region 50 achieving 8.9 tog and the first region 50 achieving 6.7 tog (equivalent to a 2.2 tog reduction in the first region).
2× extra sewing channels on first region 40 on a double sized duvet with a gross weight of 1890 grams resulted in the second region 50 achieving 8.4 tog and the first region 40 achieving 7.3 tog (equivalent to a 1.1 tog reduction in the second region).
The now-quilted layered composite 9 is fed into a cutting and hemming unit 70. This automatically side overlocks the composite 9 trimming off excess width waste fabric and fibre.
The side overlocked layered composite 9 is then automatically cut and hemmed by the machine 70, which cuts the quilt in a widthwise direction and forms overlocking seams on both widthwise edges.
The fully sewn quilt is then fed into an automatic folding and packing machine 80 in order to fold and pack the quilt.
As shown in
As shown in
One or more embodiments are described above by way of example only. Many variations are possible without departing from the scope of protection afforded by the appended claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 1820886.8 | Dec 2018 | GB | national |
