Patent Publication Number: US-2022225692-A1

Title: Seamless trousers

Description:
SUBJECT OF THE INVENTION 
     The invention relates to the production of seamless trousers. The invention relates in particular to a method for joining each leg portion of the trousers with only one seam, and for producing the trousers which are seamless on the outside in the desired model. The invention, of course, relates to the trousers which are obtained by this method, especially from denim and gabardine fabric, and the outer edges thereof are seamless. 
     PRESENT TECHNICAL FIELD 
     The trousers are the indispensable ready-made garments both in men&#39;s wear and women&#39;s wear. With the development of the textile and fashion sector, the production of the trousers has experienced significant improvements in terms of materials, models, and production techniques. However, the main feature of the production of the trousers is that with at least one seam on the inside and outside of a leg, there are at least four seams in total. Especially in the trousers made of denim, gabardine, and normal cotton-polyester fabrics, it is almost necessary to have at least four seams, one on the inside and one on the outside in each leg. Although the materials such as sweatpants or tights are excluded, four seams in the trousers bring advantages in terms of model and usage, but also increase the production costs with increasing mass production. Moreover, the drawbacks to be mentioned below, such as the seams that are separated and appear during use and the leg deflection, occur as a different disadvantage. 
     In the state of the art, especially in the denim and gabardine trousers, two seams are used on the inside and outside of a leg. In these trousers, the fabric pieces are turned into the trousers by using four seams. The main reason for this method applied in almost all trousers is the need for a non-linear joining on the top of the trousers to the legs on both sides, in order for the trousers to be sewn in a pattern suitable for the human body. Four fabric pieces which are cut according to a pattern for the trousers are joined by sewing on the inside and outside on the legs. These joints are formed so that the upper parts are wide, and the lower parts are narrow, especially the hip part is of the wider diameter. This allows the desired trousers model to be formed. However, especially in the mass production systems in which even the minutes are particularly important, this increases the production time as well as the costs. This increase in the costs covers the production time, as well as the costs of the mold and defective product and the labor costs. 
     Although in the production of the trousers in the state of the art, the seams on the inside and outside of the legs offer the desired model flexibility, there is the problem of the seam slippage in later use in the production of the trousers. Especially the outer seam and especially the seams made of the polyester thread slip in time. It is seen that the outer edge seams slip especially if the wearer of the trousers pulls them, buckles, or wears narrower trousers. This spoils the appearance of the trousers. 
     In the production of the trousers in the state of the art, sewing four fabric pieces inside and outside, which are cut according to the a particular pattern, causes a kind of production defect which is called the leg deflection during or after the production. 
     In the state of the art, it is seen that the seamless trousers are described in the Chinese patent no. CN200959834. When the patent is examined in detail, it is seen that this patent relates to a kind of trousers, such as sweatpants, which is designed for the bicycle users. 
     In the state of the art, it is seen that an embodiment of a seamless cloth is described in the Turkish patent no. 2011/01366. When the patent is examined in detail, it is seen that this patent relates to a ready-made garment designed mostly for the clothes such as bathrobes or women&#39;s dresses. 
     In the state of the art, it is seen that the seamless trousers are described in the South Korean patent no. KR20180069615. However, when the patent is examined in detail, it is seen that unlike the patent subject to the invention, a structure is described, which has the different leg diameters or body diameters and is made of the different fabric types. 
     Another patent in the state of the art is the U.S. Pat. No. 4,371,989. Although said patent describes a seamless structure, it is seen that it includes a trousers design that is used as the dancer or sportsman trousers and which contains a flexible fat structure. 
     Another patent in the state of the art is the U.S. Pat. No. 5,081,718. It is seen that the said patent describes a waterproof trousers embodiment that is mostly used for the business purposes. 
     OBJECT AND DESCRIPTION OF THE INVENTION 
     The aim of the invention is to develop a method for producing the trousers that can be used in daily life and made of a single-piece fabric, without seams on the outside of the legs, and the trousers obtained with this production method. 
     The trousers of the invention is a trousers embodiment which is directed to men&#39;s wear or women&#39;s wear, can be used in all areas, mostly made of denim or gabardine fabrics, but which can also be made of all fabrics, and in which the outer edges of two legs are seamless, and the fabrics are only joined on the inside. Here, it is referred to as “seamless trousers” since there is no seam on the outer edge. Said seamless trousers can be produced in every model, conforming with the human body. 
     An advantage of the seamless trousers of the invention is to increase the production rate especially for the mass productions. 
     Another advantage of the seamless trousers of the invention is to achieve a reduction in labor and material costs. 
     Another advantage of the seamless trousers of the invention is that the trousers can be produced in the desired model thanks to the construction of the pattern and fabric pieces. 
     Another advantage of the seamless trousers of the invention is that the problems encountered in the prior art do not occur, such as the seam slippage at the outer edge and the appearance of the threads. 
     Another advantage of the seamless trousers of the invention is that they allow a more precise measure to be achieved in manufacturing. There is little or no possibility for the sewing workshop to cut and disrupt the hip portion during the overlock seam and side seam. 
     Another advantage of the seamless trousers of the invention is that the front and back yoke cuts are single piece, thus reducing the number of materials to be cut. This increases the production rate as well as decreases the labor. 
     Another advantage of the seamless trousers of the invention is that the material to be cut in the cloth spreading is reduced by at least 20-30%, so the labelling process decreases at similar rates. Thus, the number of the labelling elements and the use of materials are also reduced. However, when the number of pieces decreases, the risk of the labelling confusion during sewing in the workshop is reduced. The production quality increases. 
     Another advantage of the seamless trousers of the invention is that the quality of the seams in the back yoke and crotch are also improved. 
     The figures will be referred to for a better understanding of the device of the invention. 
    
    
     
       DESCRIPTION OF THE FIGURES 
         FIG. 1  is a drawing of a trouser showing the seams of the trousers of the state of the art prior to the seamless trousers of the invention. 
         FIG. 2  is a schematic drawing showing the fabric pieces used to form the trousers of the state of the art prior to the seamless trousers of the invention. 
         FIG. 3  schematically shows the fabric pieces used to produce the seamless trousers of the invention. 
         FIG. 4  shows an exemplary conceptual design drawing of the seamless trousers of the invention. 
     
    
    
     REFERENCE NUMBERS OF PARTS, SECTIONS AND STEPS FOR THE PRODUCTION METHOD TO HELP EXPLAIN THE INVENTION 
     
         
         
           
               1 —Trousers
             1   a —First piece     1   b —Second piece     1   c —Third piece     1   d —Fourth piece     1   e —Curved edge cut     1   h —Dart     1   k —Joining region     1   m —First edge     1   n —Second edge   
         
               2 —Trousers leg 
               3 —inner edge seam 
               4 —Outer edge seam 
               100 —Cutting the fabrics according to the seamless trousers pattern 
               110 —Bringing the fabrics together on the joining region 
               120 —Joining the fabrics by sewing on the joining region 
               130 —Sewing the dart regions 
           
         
       
    
     DETAILED DESCRIPTION OF THE INVENTION 
     The seamless trousers of the invention are primarily designed for the fabrics made of the cotton-based threads, such as denim or gabardine. However, it can be applied not only for the cotton-based threads, but also for all types of trousers woven from the polyester or other artificial threads, woven from other types of threads, knitted, or made of non-woven fabrics. 
     In order to understand the seamless trousers of the invention, it is useful to look at the drawings showing the classic trousers and trousers main parts in the state of the art shown in  FIG. 1  and  FIG. 2 . In the state of the art, a pair of trouser ( 1 ) consists of a combination of four parts, comprising the first part ( 1   a ), the second part ( 1   b ), the third part ( 1   c ) and the fourth part ( 1   d ). The combination of the first piece ( 1   a ) and the third piece ( 1   c ) or the second piece ( 1   b ) and the fourth piece ( 1   d ) form the trousers leg ( 2 ), that is, the parts receiving the human leg. Of course, the suitable patterns are prepared to form these four parts and these patterns are used for sewing. The patterns in the state of the art need not be shown here. In the classic trousers ( 1 ) in the state of the art, the four-piece components are joined with the inner edge seam ( 3 ) on the inside and the outer edge seam ( 4 ) on the outside. These trousers ( 1 ) include a curved edge cut ( 1   e ) especially in the outer edge (if desired, in the inner edge) for the adaptation to the human body. By joining this curved edge cut ( 1   e ) with the outer edge seam ( 4 ), the trousers of suitable model can be produced. However, the above drawbacks or disadvantages arise in the production of these classic trousers. 
     The seamless trousers of the invention are referred to as “seamless” especially since there is no seam on the outer edge as mentioned above. Since the seamless trousers of the invention are basically the same type of the ready-made garment, here they are also referred to as the trousers ( 1 ) and given the same number. However, the details are different. The parts of the seamless trousers ( 1 ) of the invention and the sewn final shape thereof are shown in  FIG. 3  and  FIG. 4  as the conceptual designs. It is not necessary to show the patterns of this trousers. 
     The seamless trousers ( 1 ) of the invention have basically a structure comprising a first edge ( 1   m ) without any joining seams thereon, a second edge ( 1   n ) without any joining seams thereon, at least one dart gap ( 1   h ) corresponding to the outer upper edge in the upper part of said first edge ( 1   m ) and said second edge ( 1   n ), and the joining region ( 1   k ) joining said first edge ( 1   m ) and said second edge ( 1   n ) on the inside, and the outer edges of the trousers are seamless. 
     The seamless trousers ( 1 ) of the invention form the trousers legs ( 2 ) when the first edge ( 1   m ) and the second edge ( 1   n ) are joined on the joining region ( 1   k ). The joining region ( 1   k ) is the fabric portions in which the first edge ( 1   m ) and the second edge ( 1   n ) are joined by sewing. The seam shape is where the first edge ( 1   m ) and the second edge ( 1   n ) are brought together and joined. With this shape of the trousers ( 1 ), there is no need to be joined at the outer edge. However, in order to adapt to the human body, the part called “dart ( 1   h )” in the sector is located on the outer edge of the trousers ( 1 ) as a result of joining the first edge ( 1   m ) and the second edge ( 1   n ) so that said dart ( 1   h ) is located on the first edge ( 1   m ) and the second edge ( 1   n ) in the middle upper part. The dart ( 1   h ) may particularly not be on the flexible fabrics, if desired. 
     For the production of the seamless trousers ( 1 ) of the invention, the following basic steps will be sufficient: 
     Cutting the Fabrics According to the Seamless Trousers Pattern ( 110 ) 
     The fabrics to be sewn for the trousers are cut to be the first edge ( 1   m ) and the second edge ( 1   n ) according to the pattern. 
       110 —Bringing the Fabrics Together on the Joining Region 
     The first edge ( 1   m ) and the second edge ( 1   n ) cut for the trousers are brought together to be sewn on the joining region ( 1   k ). 
       120 —Joining the Fabrics by Sewing on the Joining Region 
     The first edge ( 1   m ) and the second edge ( 1   n ) for the trousers are joined by sewing the joining region ( 1   k ) of the parts of the first edge ( 1   m ) and the second edge ( 1   n ). 
       130 —Sewing the Dart Regions 
     The dart ( 1   h ) gaps in the first edge ( 1   m ) and the second edge ( 1   n ) are sewn by bringing them together. If desired, the dart ( 1   h ) gaps can be sewn before bringing the fabrics together. If desired, the dart ( 1   h ) is not formed and sewn based on the fabric and pattern shape. 
     By seaming the seamless trousers of the invention on the joining region ( 1   k ) on the inside, the trousers can be produced in the desired shape and in the desired model. 
     APPLICABILITY OF THE INVENTION TO THE INDUSTRY 
     Although the seamless trousers of the invention are preferred for the denim and gabardine type of fabric and trousers, they can be used in all types of daily use trousers, suits, work clothes and even sportswear.