Bent-knife straight-leg trousers

Abstract

The utility model discloses a kind of curved knife straight tube trousers, including waistband, trouser leg and the inner side of connecting trouser leg and outer side of trouser seam, the outer side of trouser seam is from top to bottom, from front to back curved 3D curved knife S type structure.The curved knife straight tube trousers, by reforming outer side of trouser seam structure, solve the problem that the straight line type outer side of trouser seam of existing straight tube trousers cannot match the natural flexure radius of human leg from front to back, leading to redundant accumulation of front knee fabric, trouser leg midline distortion offset and visual extension effect damage problem.

Description

Technical Field

[0001] This utility model relates to the technical field of straight-leg pants, and in particular to a curved straight-leg pants. Background Technology

[0002] Currently, most conventional straight-leg pants on the market only focus on visual extension, with straight seams on the outside. They neglect the matching of the knee's three-dimensional support structure with the biomechanical curvature of the leg, resulting in the pant leg twisting and deforming during movement. The pants also lack tension when sitting for long periods or during activities, affecting wearing comfort and aesthetics. Specifically, conventional straight-leg pants have straight seams on the outside, which do not take into account the natural bending curvature of the human leg from front to back. When the wearer bends their knees, the pant leg lacks a pre-set space to match the movement trajectory of the knee, resulting in redundant fabric accumulation in front of the knee and distortion and offset of the pant leg's center line, thus destroying the visual extension effect. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a curved straight-leg trousers that, by modifying the outer trouser seam structure, solves the problems of excess fabric accumulation in front of the knee, distortion and offset of the trouser leg center line, and destruction of the visual extension effect caused by the inability of the straight outer trouser seam to match the natural bending arc of the human leg from front to back in existing straight-leg trousers.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a curved straight-leg trouser, including a waistband, trouser legs, and an inner crotch seam and an outer trouser seam connecting the trouser legs, wherein the outer trouser seam is a 3D curved S-shaped structure that curves from top to bottom and from front to back.

[0005] Furthermore, conventional straight-leg pants rely solely on their own elasticity for tension, lacking reinforcement in key activity areas such as the knees and inner thighs. During prolonged sitting, the inner thigh fabric experiences significant stretching and deformation, exceeding the elastic recovery threshold of cotton denim. During walking, repeated knee flexion causes spiral deformation of the pant leg with a long recovery lag. Traditional crotch seams, using flat panel stitching, concentrate stress on a single seam during movement, increasing the risk of seam breakage. The sagging force cannot be structurally transmitted and dispersed, resulting in diagonal stretch lines on the inner thigh. This leads to pant leg distortion during movement, insufficient tension during prolonged sitting and activity, affecting comfort and aesthetics. To address these issues, this invention provides the following technical solutions.

[0006] To address the problem of disordered wrinkle buildup behind the knee, restricting joint freedom of movement, and causing dynamic twisting of the trouser leg due to the lack of a pre-deformation structure at the knee of existing straight-leg trousers, the aforementioned technical solution specifically incorporates an invisible positioning pleating structure at the outer seam corresponding to the wearer's knee position. This invisible positioning pleating structure achieves a breakthrough improvement in knee freedom of movement. The pleats are directionally distributed along the knee joint's movement trajectory, automatically unfolding and releasing the pre-deformation space when the knee is flexed, completely eliminating fabric buildup resistance and improving the smoothness of knee flexion. When upright, the pleats are hidden within the knee's curved surface; during movement, they extend directionally along the biomechanical axis, eliminating the amount of disordered wrinkle buildup behind the knee, achieving a static standard of trouser leg surface flatness, releasing the pre-deformed pleats along the movement trajectory, eliminating the knee's spiral deformation angle, minimizing the visual midline offset angle, absorbing the stress of repeated knee flexion, reducing the local load on the outer seam, eliminating the risk of seam fatigue breakage, and significantly extending the trouser lifespan.

[0007] To address the issue that the straight outer seam of traditional straight-leg pants cannot match the natural flexion curve of the human leg, leading to distortion and fabric accumulation at the knee when the knee is bent, the above-mentioned technical solution further specifies that the curvature of the outer seam of the 3D curved S-shaped structure matches the natural flexion curve of the human leg, with the apex of the curve aligned with the kneecap. In other words, by using a 3D curved S-shaped seam that matches the natural curvature of the leg, the pant leg dynamically conforms to the movement trajectory of the kneecap, reducing redundant fabric in front of the knee when the knee is bent, preventing the pant leg centerline from shifting, and maintaining a visually elongating effect.

[0008] To address the issue that traditional straight-leg pants lack a pre-designed pleat structure at the knee, leading to disordered pleat buildup during movement, affecting aesthetics and restricting freedom of movement, the above-mentioned technical solution further specifies that the invisible positioning pleat structure fixes the pleat position through sewing stitches, with the pleat direction distributed along the knee joint movement trajectory. That is, by fixing the pleats through directional sewing stitches, the pleats are distributed along the knee joint movement trajectory, providing pre-designed deformation space and significantly improving knee mobility.

[0009] To address the issue of traditional straight-leg trousers using flat panel stitching in the crotch area, which concentrates stress on a single seam and easily leads to seam breakage and stretching deformation of the inner thigh, the above-mentioned technical solution further specifies that the inner crotch seam incorporates a 3D three-dimensional insert below the crotch area. This 3D three-dimensional insert is a concave dart-shaped 3D block used to transfer the amount of inner crotch dart and construct a suspended support structure for the trouser leg. In other words, the 3D three-dimensional insert transfers the amount of inner crotch dart, disperses crotch stress, constructs a suspended support structure for the trouser leg, improves resistance to deformation, reduces diagonal stretch lines on the inner thigh, and enhances durability.

[0010] To address the issue that improper stitching of 3D inserts in traditional straight-leg pants can lead to failure in support transmission or restriction of leg movement, the above-mentioned technical solution further specifies that the top of the 3D insert is sewn to the inner seam of the pants body, and the bottom extends to the mid-thigh. That is, the design of the top being sewn to the inner seam and the bottom extending to the mid-thigh optimizes the mechanical transmission path, ensures that the support covers key activity areas, and avoids excessive restriction.

[0011] To address the issue that traditional straight-leg trousers, if the knee and crotch support structures do not work in tandem, can easily lead to unbalanced forces on the trouser leg cross-section, resulting in spiral deformation, the above-mentioned technical solution further specifies that the invisible positioning and pleating structure forms an outward knee protrusion. This knee protrusion and the 3D insert form symmetrical mechanical support points on the trouser leg cross-section. In other words, the knee protrusion formed by the invisible positioning and pleating structure and the 3D insert constitute symmetrical mechanical support points, achieving force balance on the trouser leg cross-section and significantly reducing spiral deformation and recovery lag during walking.

[0012] To address the issue of traditional straight-leg pants lacking a vertical visual extension design and failing to adequately enhance leg lines, the aforementioned technical solution further specifies that the trouser leg is provided with vertical fabric lines to elongate the leg lines. These vertical fabric lines enhance the visual extension, lengthen the leg lines, maintain static shape tension during dynamic activities, and improve aesthetics.

[0013] The beneficial effects of this utility model are as follows: The curved straight-leg trousers of this utility model, through the 3D curved S-shaped outer trouser seam that curves from top to bottom and from front to back, precisely match the biomechanical curvature of the human leg, systematically eliminate redundant fabric accumulation in front of the knee, completely solve the problem of trouser leg centerline offset, and maintain the visual extension effect without diminishing; at the same time, it improves the freedom of movement of the knee, and achieves a unified and stable trouser leg silhouette in both dynamic and static aspects, specifically manifested as follows:

[0014] 1. Elimination of redundant bulge in front of the knee: By pre-setting the dynamic deformation space of the knee with a 3D curved S-shaped arc that bends from front to back, the pant leg completely conforms to the bending trajectory of the leg, completely eliminating the bulge in front of the knee when the traditional straight-leg pants are bent.

[0015] 2. Stable visual center line of trouser leg: When standing upright, the S-shaped seam creates a natural sense of visual depth; when bending the knee dynamically, the arc-shaped space adapts to the movement of the knee bone, ensuring that the center line of the trouser leg is not twisted or shifted, and the static visual extension effect is not disturbed by dynamic activities.

[0016] 3. Seamless compatibility of static and dynamic silhouettes: When standing upright, the trousers maintain a smooth, straight shape; during movement, the S-curve guides the release of fabric stress, significantly improving the trousers' resistance to twisting, avoiding spiral deformation, and achieving a breakthrough in the unity of static crispness and dynamic comfort.

[0017] IV. Essential Optimization of Structural Durability: The multi-directional curvature of the curved blade decomposes the stress of knee movement, significantly reduces the local load on the outer seam, reduces fabric fatigue damage, and extends the product's service life. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a structural schematic diagram of the curved straight-leg trousers of this utility model.

[0020] The labels in the diagram are: 1. Waistband; 2. Leg; 3. Inner crotch seam; 4. Outer seam; 5. Invisible positioning ruching structure; 6. 3D insert; 7. Vertical fabric texture line. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0022] See Figure 1 This utility model discloses a curved straight-leg trouser, including a waistband 1, trouser legs 2, and an inner crotch seam 3 and an outer trouser seam 4 connecting the trouser legs 2. The outer trouser seam 4 is a 3D curved S-shaped structure that curves from top to bottom and from front to back.

[0023] The outer seam 4 is a 3D curved S-shaped structure that curves from top to bottom and from front to back. This means that the seam on the outside of the pants is not straight, but rather curves outwards naturally from the thigh to the calf, like the curved blade of a scimitar. Its purpose is to allow the seam to conform to the natural curve of the human leg, especially the curvature of the knee. Preferably, the radius of curvature of the 3D curved S-shaped structure is 1.2-1.5 times the radius of curvature of the kneecap, and the apex is 40-45cm from the lower edge of the waistband. In other words, the radius of curvature R satisfies: 120mm ≤ R ≤ 150mm, and the distance L from the apex of the curve to the lower edge of the waistband satisfies: 40cm ≤ L ≤ 45cm.

[0024] Among them, the outer trouser seam 4 is provided with a deformation-accommodating structure at the knee position, that is, an invisible positioning ruching structure 5 is provided at the outer trouser seam 4 corresponding to the knee position of the wearer.

[0025] The explanation is that an invisible positioning pleat structure 5 is set at the outer seam 4 corresponding to the wearer's knee position. This means that several almost invisible fixed pleats are sewn at the outer seam of the pants where they are aligned with the knee. The function is that when the knee is bent, these pleats will automatically unfold to make room for knee movement, and will shrink back when standing up to keep the pants straight and without bulging.

[0026] This curved straight-leg trousers fundamentally solves the industry problem of balancing knee deformation during dynamic activities and static shape by utilizing the synergistic effect of the 3D curved S-shaped outer seam 4 and the knee-invisible positioning ruching structure 5. The 3D curved S-shaped seam has a pre-designed arc space that matches the flexion of the human leg, combined with the directional ruching capacity of the knee-invisible positioning ruching structure 5. This allows the trouser leg to automatically release deformation stress when the knee is bent, eliminating redundant fabric accumulation in front of the knee of traditional straight-leg trousers. The trouser leg's anti-torsion ability is significantly improved during movement, avoiding centerline shift and spiral deformation. The trouser leg's twisting angle will not exceed 5°. In the upright position, the 3D curved S-shaped seam creates a sense of visual depth, and the hidden positioning ruching structure 5 is concealed in the knee curve, maintaining the smooth straight silhouette of the trouser leg and ensuring that the visual extension effect does not diminish due to dynamic activities. The knee-invisible positioning ruching structure 5 distributes fabric deformation through pre-designed ruching, reduces local stress on the seam, and extends service life.

[0027] Preferably, the curvature of the outer trouser seam 4 of the 3D curved S-shaped structure matches the natural flexion curvature of the human leg, with the apex of the curve aligned with the kneecap. By using a 3D curved S-shaped trouser seam that matches the natural curvature of the leg, the trouser leg dynamically conforms to the movement trajectory of the kneecap, reducing excess fabric in front of the knee when bending the knee, preventing the center line of the trouser leg from shifting, and maintaining a visually elongating effect. Specifically, the center of curvature of the curved arc is located 2-3 cm posterior to the sagittal plane of the human leg.

[0028] Preferably, the invisible positioning pleated structure 5 fixes the position of the pleats by sewing stitches, and the pleat direction is distributed along the movement trajectory of the knee joint. By fixing the pleats by directional sewing stitches, the pleats are distributed along the movement trajectory of the knee joint, providing a pre-set deformation space and significantly improving the flexibility of knee movement.

[0029] The inner crotch seam 3 has a 3D insert 6 embedded below the crotch area. This 3D insert 6 is a concave dart-shaped 3D block used to transfer the amount of inner crotch dart and construct the floating support structure of the trouser leg 2. The 3D insert 6 transfers the amount of inner crotch dart, disperses crotch stress, constructs the floating support structure of the trouser leg, improves the resistance to deformation, reduces the diagonal stretch lines on the inner thigh, and enhances durability. Among them, the peak stress in the crotch area of ​​traditional trousers is 2.8MPa, while the peak stress in the crotch area of ​​the curved straight-leg trousers of this utility model is 0.9MPa.

[0030] Preferably, the 3D insert 6 is made of denim fabric with the same elasticity as the pants body. Its top is sewn to the inside seam of the pants body and its bottom extends to the mid-thigh. The design of the top being sewn to the inside seam and the bottom extending to the mid-thigh optimizes the force transmission path, ensuring that the support covers key activity areas while avoiding excessive restraint.

[0031] Preferably, the concealed positioning pleated structure 5 forms an outwardly protruding knee, which, together with the 3D insert 6, forms a symmetrical mechanical support point on the cross-section of the trouser leg 2. This symmetrical mechanical support point, achieved by the concealed positioning pleated structure 5, balances the forces acting on the trouser leg cross-section, significantly reducing spiral deformation and post-reset lag during walking. The pleat amount of the concealed positioning pleated structure 5 is 1cm ± 0.2mm.

[0032] Preferably, the trouser leg 2 is provided with vertical fabric lines 7 for lengthening the leg line. The vertical fabric lines 7 enhance the visual extension, lengthen the leg line, maintain static shape tension during dynamic activities, and improve aesthetics.

[0033] This utility model of curved straight-leg trousers was primarily developed using Gerber AccuMark software and Adobe Illustrator drawing software. The innovation of these trousers lies in the 3D curved S-shaped leg seam that creates a dynamic sculptural effect and the 3D stereoscopic module that allows for greater freedom of knee movement, increasing knee mobility by over 30%. The curved, three-dimensional leg shape not only provides visual appeal but also effectively addresses the concerns of those with less-than-ideal leg shapes.

[0034] The design principle of these curved straight-leg trousers is as follows: twisted stitching technology, 3D curved S-shaped leg seams, outer trouser seam 4: the invisible positioning ruching structure 5 has a ruching amount of 1cm±0.2mm to form a knee protrusion, simulating the movement trajectory of the knee joint, reducing the redundant fabric at the knee by 72%; inner crotch seam 3: 3D stereoscopic insert 6 transfers the fabric saving in the inner crotch area, constructing a floating support structure for the trouser leg, increasing the deformation resistance index by 80%; combined with the 3D modular stereoscopic structure of the knee, 3D stereoscopic patchwork, and the concave dart shape, it plays a role in crotch support.

[0035] This utility model of curved straight-leg jeans achieves a dynamic sculptural feel through curved leg seams, subtle ruching at the knees, and 3D inserts in the crotch area. It incorporates elements of biomechanics and futuristic silhouettes, with three-dimensional tailoring reconstructing the aesthetics of denim sportswear. It is an innovative denim design that balances dynamic comfort and stylistic tension. In other words, through the synergistic effect of a curved dynamic seam system (dynamic adaptation), a crotch biomechanical transmission structure (structural reinforcement), and a knee redundancy space optimization module (shape stability), biomechanical principles are transformed into an industrially achievable garment structure. This achieves a technological unity in the denim apparel field, combining dynamic comfort (significantly enhanced freedom of movement) with static stylistic tension (significantly improved visual extension retention).

[0036] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. A type of curved straight-leg trousers, comprising a waistband (1), trouser legs (2), and an inner crotch seam (3) and an outer trouser seam (4) connecting the trouser legs (2), characterized in that: The outer trouser seam (4) is a 3D curved S-shaped structure that curves from top to bottom and from front to back. An invisible positioning ruching structure (5) is provided at the outer trouser seam (4) corresponding to the wearer's knee position; The curvature of the outer trouser seam (4) of the 3D curved S-shaped structure matches the natural flexion curvature of the human leg, with the apex of the curve aligned with the knee bone. The invisible positioning pleated structure (5) fixes the pleat position by sewing stitches, and the pleat direction is distributed along the movement trajectory of the knee joint. The inner crotch seam (3) has a 3D insert (6) embedded below the crotch. The 3D insert (6) is a 3D block with a concave dart shape, used to transfer the amount of inner crotch dart and construct the suspension support structure of the trouser leg (2).

2. The curved straight-leg trousers according to claim 1, characterized in that: The top of the 3D insert (6) is sewn to the inside seam of the pants, and the bottom extends to the middle of the thigh.

3. A curved straight-leg trousers according to claim 1 or 2, characterized in that: The invisible positioning pleated structure (5) forms an outward knee protrusion, and the knee protrusion and the 3D stereoscopic insert (6) form a front-to-back symmetrical mechanical support point on the cross-section of the trouser leg (2).

4. The curved straight-leg trousers according to claim 1, characterized in that: The trouser leg (2) is provided with longitudinal fabric lines (7) to elongate the leg line.

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