Belt with failure indication part and safety device comprising same

Abstract

The invention relates to a belt with a failure indication part and a safety device comprising the same. The belt comprises a main body structure formed by weaving; and one or more second yarns, the second yarns are straightly integrated into the main body structure along the length direction of the main body structure over the whole length of the main body structure and are at least partially fixed to the main body structure, and the main body structure and the second yarns are selected to stretch and not break under the action of a preset amount of tensile force. And after the tensile force is released, the main body structure retracts, so that the at least one second yarn at least partially protrudes out of the plane of the main body structure to form a failure indication ring. The safety device according to the present invention comprises a member comprising the belt having the failure indication part. The invention also relates to a method of manufacturing a belt having a failure indicator.

Description

Technical Field

[0001] The present invention relates to a belt with a failure indication part and a safety device comprising the belt, such as a safety helmet including a safety harness, a safety rope, and a suspension system composed of the belt and the safety device. Background Art

[0002] Safety devices available on the market, such as helmets, have intelligent damage indicators that can intuitively indicate age / wear / damage using sensors and additional circuits or batteries and lights. For example, US20070056081A1 discloses a helmet, wherein, in order to allow the occurrence of impact to be monitored, the helmet is provided with an impact sensor in the form of a material layer 18 that is sensitive to impact, wherein the layer 18 has a property that the resistance changes with the change of the mechanical load applied thereto. Under normal circumstances, the resistance of the layer 18 is very high. However, in the case of an impact caused by, for example, the wearer's head hitting the road surface or another hard object due to a road traffic accident, the impact force will temporarily squeeze or compress the layer 18, thereby causing the resistance of the layer 18 to be temporarily reduced. Correspondingly, a unit 22 including an internal power supply and a memory in the form of, for example, a battery is provided to monitor the resistance of the layer 18, and a warning device 24 such as an LED is issued in the event of a collision. Obviously, in the case of using a warning light, there is a risk that no warning signal will be generated if the battery is exhausted. Moreover, the use of electronic devices increases the cost of the helmet.

[0003] Therefore, there is a need for an improved solution that does not use batteries or electronics and that can reliably indicate whether damage has occurred. Summary of the invention

[0004] The present invention is made in view of the above problems existing in the prior art.

[0005] One of the purposes of the present invention is to provide a belt with a failure indicator so as to be able to indicate whether stretching, impact or damage has occurred. The belt comprises: a main structure formed by weaving; and one or more second yarns, the second yarns are straightly integrated into the main structure along the length direction of the main structure over the entire length of the main structure and at least partially fixed to the main structure, wherein the main structure and the second yarns are selected to stretch and not break under a predetermined amount of tensile force, and after the tensile force is released, the main structure retracts so that at least one second yarn at least partially protrudes from the plane of the main structure to form a failure indicator ring.

[0006] Preferably, under the action of a predetermined amount of tensile force, the elongation of the main structure is greater than the elongation of the second yarn, so that the second yarn is detached from the fixation to the main structure and can slide in the main structure (i.e., relative to the main structure); when the tensile force is released, the main structure retracts, and the second yarn does not retract due to plastic deformation, so that the length of the main structure is shorter than the length of at least one sliding second yarn, so that the at least one second yarn at least partially protrudes from the plane of the main structure.

[0007] Further preferably, the belt has a compensating portion, which can compensate for the difference in elongation between the main structure and the second yarn under a predetermined amount of tensile force, that is, the compensating portion can be used to limit the elongation of the main structure. Preferably, the compensating portion is formed by setting the second yarn to be longer than the main structure; more preferably, the portion longer than the main structure is folded along the width direction of the main structure and fixed to the main structure by, for example, hot melt adhesive. Still preferably, the compensating portion is formed by folding the end of the main structure.

[0008] Preferably, the main structure is formed by weaving a first yarn different from the second yarn in a plain weave, double-sided weave, jacquard weave, etc., so that the maximum tensile force of a single main structure is in the range of 800-2000N, and the elongation is about 15%-35%. Preferably, the material of the first yarn can be selected from elastically retractable materials, such as polyester low-elastic yarn, polyester high-elastic yarn, spandex core-spun materials, etc.; the material of the first yarn can also be selected from materials that cannot retract after stretching, such as polyester, polyamide, natural fibers (cotton, linen, silk and wool), other man-made fibers, such as viscose, acrylic, acetate, etc. Preferably, after the tensile force is released, the main structure retracts to its original length, and the first yarn can be made of materials such as polyester low-elastic yarn, polyester high-elastic yarn, spandex core-spun materials, etc. The retraction performance of the coil woven by the first yarn after stretching mainly depends on the performance of the coil structure itself and the material of the first yarn itself. If the elastic retraction of the material of the first yarn itself is very small or non-existent, the belt itself can also retract by relying on the coil structure.

[0009] Preferably, the tensile strength of the second yarn material is about 2.0N / Tex or more, and the elongation at break is about 2-5%. The second material can be selected from the following: ultra-high molecular weight polyethylene (UHMWP), liquid crystal polymer (LCP), para-aramid or any appropriate material.

[0010] Preferably, under the action of a predetermined amount of tensile force, the second yarn deforms synchronously with the main structure, and after the tensile force is released, the length of the main structure after retraction is shorter than the length of at least one second yarn that has undergone plastic deformation, so that the at least one second yarn at least partially protrudes from the plane of the main structure to form a failure indicator ring. Preferably, the elongation of the main structure is caused by the orientation deformation and arc straightening of the braided coils of the main structure and can be fully recovered, and the elongation of the second yarn is caused by plastic deformation. Preferably, the material of the second yarn can be MDPE or HDPE yarn or PE yarn, for example, PE yarn has a strength of 2.6-4.2g / D and an elongation at break of up to 65%.

[0011] Preferably, the second yarn is integrated straightly in the main structure by: a plurality of second yarns are straightly embedded in the knitting loops of the main structure, or a plurality of second yarns are straightly knitted into the knitting loops of the main structure in a flat stitch manner. Preferably, the plurality of second yarns are formed by a single second yarn that is arranged in a serpentine shape and turns at the end of the main structure. Preferably, the second yarns are arranged symmetrically with respect to the longitudinal center axis of the main structure.

[0012] Preferably, the second yarn is fixed to the main body by: the at least one second yarn is wound with a hot melt at a twist of 6 to 10 turns / cm and fixed in the main structure by heat treatment; or by using an adhesive. The second yarn can be twisted to increase strength or untwisted.

[0013] Another object of the present invention is to provide a safety device comprising a component consisting of the above-mentioned belt with a failure indication portion, so as to facilitate judgment as to whether the safety device has been damaged.

[0014] Preferably, the safety device is a helmet and the component is a suspension system. The suspension system is arranged in the body of the helmet and the cushion of the suspension system is spaced apart from the body, the suspension system comprises a plurality of straps symmetrically connected to the cushion, at least one of the plurality of straps being formed by a strap with a failure indication portion as described above. Preferably, the total length of the compensation portion is selected not to exceed the vertical spacing between the cushion and the body. Preferably, the plurality of straps may be 2 straps fixed in the body at 4 or 8 points, or 3 straps fixed in the body at 6 or 8 or 12 points. If there are 3 straps, at least one strap has a different length or structure from the other straps.

[0015] Preferably, the safety device may be a safety harness or a safety rope worn on a person.

[0016] Yet another object of the present invention is to provide a method for manufacturing a belt having a failure indicator, comprising:

[0017] a) providing a first yarn;

[0018] b) providing a second yarn;

[0019] c) weaving the first yarn to form a main structure and making the second yarn integrated straight into the main structure and extending the entire length of the main structure, and

[0020] d) at least partially securing a second yarn to the body structure;

[0021] Wherein, the main structure and the second yarn are selected to stretch without breaking under a predetermined amount of tensile force, and after the tensile force is released, the main structure retracts so that at least one second yarn can at least partially protrude from the plane of the main structure to form a failure indicator circle.

[0022] Preferably, in step c, the first yarn is woven in a plain weave, double-sided weave, jacquard weave or the like manner to form a main structure, so that the elongation of the main structure under a predetermined amount of tensile force is basically caused by the orientation deformation of the woven coils and the straightening of the arcs.

[0023] Preferably, the method further comprises: in step b, winding a hot melt wire on the second yarn, further preferably, the twist of the hot melt wire is 6 to 10 turns / cm, and in step d, heating the tape to melt the hot melt wire to fix the second yarn to the main structure. The melting point of the hot melt wire is 80 to 130°C, so heating the tape is performed by applying a temperature higher than the melting point of the hot melt wire to the tape.

[0024] Further areas of applicability of the present disclosure will become apparent from the detailed description, claims and accompanying drawings.The detailed description and specific examples are intended for purposes of illustration only and are not intended to limit the scope of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The preferred embodiments of the present invention are explained in more detail below in conjunction with the accompanying drawings to better understand the features and advantages of the present invention. Embodiments of the present invention will now be further described with reference to the accompanying drawings, in which:

[0026] Figure 1A Schematically shows a first belt with a failure indicator according to a first embodiment of the present invention;

[0027] Figure 1B Schematically shows Figure 1A A partial enlarged view of the belt;

[0028] Figure 2A Schematically shows the Figure 1AA first belt structure made of a belt, wherein each end of the belt undergoes two folds and is fixed together by stitching, and the belt is not subjected to any stretching force;

[0029] Figure 2B Schematically shows Figure 2A The first belt structure in the state after being subjected to a tensile force;

[0030] Figure 3 Schematically shows a second belt with a failure indicator according to a second embodiment of the present invention;

[0031] Figure 4A Schematically shows the Figure 3 a second belt structure made of a belt, wherein each end of the belt undergoes a fold and is secured together by stitching, and the belt is not subjected to any stretching force;

[0032] Figure 4B Schematically shows Figure 4A The second belt structure in the state after being subjected to a tensile force;

[0033] Figure 5A Schematically shows a part of a third belt having a failure indication portion according to a third embodiment of the present invention, wherein the belt is not subjected to any tensile force;

[0034] Figure 5B Schematically shows Figure 5A The belt in the middle is in a state after being subjected to a tensile force;

[0035] Figure 6 schematically shows an example arrangement of a failure indicator in a belt according to the invention; and

[0036] Figure 7 The weaving process of a belt according to the invention is schematically shown.

[0037] In the drawings, unless otherwise specified, functionally identical elements have the same or similar reference numerals. It will be understood that the drawings are not drawn to scale and are only intended to best illustrate the structures schematically. DETAILED DESCRIPTION

[0038] The present invention will be described in more detail below with reference to exemplary embodiments. The following examples are intended to illustrate the present invention by way of example only, and it should be clear to those skilled in the art that the present invention is not limited to these examples or experimental data. It will be understood that equivalent functions and structures can be achieved by different embodiments, and these different embodiments are also intended to be included in the spirit and scope of the present disclosure.

[0039] Figure 1AA belt with a failure indicator according to a first embodiment of the present invention is shown. The belt has a length of 340±5 mm, a width of about 20±2 mm, a 100 mm reinforcement portion substantially centrally arranged along the length direction, and a thickness of the belt of 1.5±0.2 mm at the unreinforced portion and 2.2±0.2 mm at the reinforced portion, wherein the reinforcement portion of the belt is realized by weaving into a double layer. Alternatively, the reinforcement portion can also be implemented by other means known to those skilled in the art, and the length, width and thickness of the belt and the reinforcement portion can be selected according to actual needs to provide a better cushioning effect.

[0040] Figure 1B Schematically shows Figure 1A A partial enlarged view of the A portion of the woven structure of the belt. The woven structure includes a main structure 10 and three second yarns 12 straightly embedded in the main structure along the length direction of the main structure over the entire length of the main structure, and the second yarns 12 are at least partially releasably fixed to the main structure, for example at the end area of ​​the belt. The main structure 10 is plain woven from a first yarn 11 and includes a plurality of intermeshing coils 13 formed by the first yarn 11, and the plurality of intermeshing coils 13 define a plurality of horizontal rows and vertical longitudinal rows. The second yarns 12 are straightly arranged in spaced-apart rows and alternate in the respective rows between being located (i) behind the coils 13a formed by the first yarn 11 and (ii) in front of the coils 13b formed by the first yarn 11. Figure 1A In the belt shown, six second yarns are included, arranged symmetrically in groups of three along the longitudinal center axis of the belt to promote uniform force distribution. Preferably, while the first yarn 11 forms each of the rows in this configuration, additional yarns of different materials may form one or more of the rows or may form part of one or more of the rows in the rows, for example to provide a reinforcement portion.

[0041] The fixing of the second yarn 12 to the main structure can be achieved as follows: a hot melt with a twist of about 6 to 10 turns / cm is wound locally or along the entire length of the second yarn 12 and the hot melt is melted by heating, thereby fixing the second yarn and the overlapping part of the coil 13 together. If the twist of the hot melt is too small, a firm fixation cannot be achieved, and if the twist is too large (i.e., too much winding), the webbing will feel hard, and it may also cause the second yarn to be unable to slide and stretch under instantaneous load because it cannot be separated from the combination with the main structure due to too tight bonding, thus losing the indication function. The hot melt can be a low-melting point hot melt, for example, a nylon hot melt with a specification of 100D (D: denier), 150D, and 180D sold by Fujian Yiming Wire Industry. Alternatively, in the case where the hot melt is not wound, the releasable fixation of the second yarn 12 to the main structure can be achieved by any suitable means, such as by an adhesive.

[0042] exist Figure 1A In the belt, the first yarn 11 is a polyester fiber core-spun spandex yarn, the main structure is plain woven from the yarn and can achieve an elongation of 25% to 30%; the second yarn 12 used as a failure indicator is made of original color 1000D LCP, with a tensile strength of 2.1N / dtex and an elongation at break of approximately 3.4%; the melted hot melt wire (not shown) is a transparent 150D nylon hot melt wire, which is wound on the second yarn along the length of the second yarn with a twist of approximately 8 turns / cm. Figure 1A When the belt is subjected to a predetermined amount of tensile force, both the main structure and the LCP yarn can be extended without failure, but due to the short elongation of the LCP yarn, during the stretching process of the belt, the LCP yarn at least partially fixed to the main structure of the belt will be separated from the main structure and slide inside the main structure, so that after the tensile force is released, the main structure retracts to a substantially original length while the second yarn does not retract, so that the second yarn at least partially protrudes from the plane of the main structure due to friction to form a failure indicator ring. The second yarn can be a different color from the main structure, so that the protruding indicator ring is very obvious, whereby the second yarn can be easily used as an indicator to indicate whether the belt has been stretched.

[0043] In another embodiment, the second yarn is set to be longer than the main structure, and the part longer than the main structure is folded along the width direction of the main structure (if it is much longer, it may need to be folded multiple times) or folded in the length direction and fixed to the main structure at several points by, for example, hot melt adhesive. In this way, under the action of a predetermined amount of tensile force, the second yarn has a different strain rate from the main structure, so the second yarn completely breaks away from the fixation with the main structure by getting rid of the fixing force of the hot melt, so that it can slide relative to the main structure during the elongation of the main structure. After the predetermined amount of tensile force is released, the main structure retracts, making the second yarn longer than the main structure, so it will protrude from the plane of the main structure to form a failure indicator circle.

[0044] The belt was mechanically tested using an INSTRON 5967 testing machine in accordance with ISO 13934 standard, wherein the standard distance was 220 mm, the reinforcement portion of the belt was centered, the tensile rate was 100 mm / min, the test temperature was 26±3° C., and the humidity was 85%. As a result, the maximum tensile load of the belt was not less than 800 N, and the belt extended 62±5 mm at the maximum tensile load, i.e., the elongation was about 28%.

[0045] Figure 2A Schematically shows the Figure 1AThe first belt structure made of a belt is in a state before being subjected to any tensile force. The belt structure can be used for the suspension system of a helmet, etc., wherein the second yarn is firmly fixed at the end of the main structure. The first belt structure includes a first section 14 and a first bending portion 16 and a second bending portion (hereinafter referred to as a compensation portion 17) formed in sequence at each end of the first section, wherein the first bending portion and the compensation portion are formed by folding each end of the belt twice in opposite directions to form a two-layer structure directly connected to the first section, namely the first bending portion, and a two-layer structure directly connected to the first bending portion, namely the compensation portion 17, respectively, and the main part of the end of the belt is fixed to the main structure of the first bending portion and the adjacent first bending portion of the first section by, for example, a suture 15, and the fixation does not affect the sliding of the subsequent second yarn. The suture 15 is the boundary between the first section and the first bending portion, and is also the boundary between the first bending portion and the compensation portion. The length L of the first belt structure is about 280 mm, and the compensation portions 17 are each about 20 mm long when unfolded, that is, the total unfolded length is 40 mm.

[0046] In order to determine the indicating effect of the belt, a top impact test can be performed on a helmet having a suspension system composed of the belt according to the DIN EN 397 standard, the ANSI Z89.1 type 1 & type II standard or the EN 12492:2012 standard. For example, the DIN EN 397 standard or the EN 12492:2012 standard mainly includes wearing the helmet on the head mold, allowing a 5kg, 50mm diameter semi-spherical metal hammer to fall freely from a height of 1 meter or 2 meters to hit the center of the top of the helmet (this will cause a predetermined amount of tensile force), and the test process is completed within 1 minute. The ANSI Z89.1 standard uses a 3.6kg hammer to fall freely from a height of 1.5 meters to hit the center of the top of the helmet. It will be understood that the predetermined amount of tensile force can also be a specific value selected according to other appropriate standards or other actual needs. The following is only explained by taking EN 12492:2012 as an example.

[0047] like Figure 2B As shown, after being subjected to an impact load according to the EN 12492:2012 standard, the entire first belt structure retracts to its original length, and at the same time, the second yarn 12 partially protrudes from the plane of the main structure to form a failure indication loop. Due to the color difference between the second yarn and the main structure, the protruding loops are particularly obvious, making it possible to visually inspect these protruding loops to determine that the belt and therefore the helmet have been subjected to an impact and can no longer be used. In addition, the compensation portion 17 is curled together to present a significantly thick portion, which also indicates that the belt has been stretched.

[0048] The reason why the second yarn 12 can be used as a failure indicator is specifically explained as follows:

[0049] Under the action of a predetermined amount of tensile force (as mentioned above, the tensile force generated by a 5kg, 50mm diameter hemispherical metal hammer falling freely from a height of 2 meters and hitting the center of the top of the hat), the main structure woven from core-spun spandex yarn and the 1000D LCP yarn straightly embedded in the main structure can both extend without failure, thereby achieving the effect of alleviating instantaneous impact force. In this process, the main structure is elongated due to the orientation deformation of its braided coils and the straightening of the arcs, so after the tensile force is released, the main structure can easily return to its original length. In contrast, since the second yarn has a different strain rate from the main structure, the multiple second yarns are completely detached from the main structure except at the ends of the band by getting rid of the fixing force of the hot melt, so that they can slide relative to the main structure during the elongation of the main structure. In this case, since the extension of the second yarn is less than that of the main structure, the difference in elongation with the main structure is compensated by tightening the second yarn at the compensation portion 17 (i.e., sliding toward the first bend and the first section relative to the main structure of the compensation portion 17), thereby causing the compensation portion 17 to curl together. After the tensile force is released, the second yarn undergoes plastic deformation and cannot retract, so that the length of the final main structure will be shorter than the length of at least one second yarn 12. Therefore, the second yarn 12 at least partially protrudes from the plane of the main structure to form a failure indicator ring. At the same time, the curled compensation portion 17 cannot be unfolded for the most part because the second yarn has not retracted, so it can also serve as a failure indicator. It is worth noting that during the stretching process, most of the high-strength and low-elongation second yarn at the compensation portion 17 is tightened to the first bend and the first section, thereby compensating for the difference in elongation between the second yarn and the main structure. As shown in this embodiment, the maximum elongation that can be compensated is about 40 mm. Considering that the elongation of the second yarn is very small, it can be said that the elongation of the main structure can be limited to about 40 mm by the compensation portion. Accordingly, the length of the compensation portion can be designed as required, for example to ensure that the buffer pad of the suspension system of the helmet does not contact the helmet body under impact, thereby improving the safety of the helmet.

[0050] Figure 3A second tape according to a second embodiment of the invention is schematically shown, which is constructed in a similar manner to the first embodiment, except that the second yarn therein is formed by a single second yarn 22 arranged in a serpentine arrangement. In the serpentine arrangement, starting at the right end of the main structure 20 of the second tape, a first embedded portion of the single second yarn extends the entire length of the main structure and changes direction at the left end of the main structure to form a second embedded portion extending the entire length of the main structure, which in turn changes direction at the right end of the main structure to form a third embedded portion and so on until 6 embedded portions are formed. The second yarn is at least partially fixed to the main structure by glue or hot melt adhesive. It will be understood that more or fewer straight embedded portions can be presented by a single second yarn, such as 8, 10, 12, etc.

[0051] Similar to Figure 2A , Figure 4A Schematically shows the Figure 3 The second belt structure is a state before being subjected to any tensile force. The first yarn 21 of the second belt structure is a non-elastic yarn, for example, a 600D polyester dyed steel gray, and its tensile strength is 3.52cN / dtex. The main structure is plain woven from the yarn and can reach an elongation of 25% to 30%, and the second yarn 22 is formed by LCP. The second belt structure includes a first section 24 and a first bending portion 26 and a compensation portion 27 at both ends thereof. The first bending portion 26 and the compensation portion 27 are fixed by sutures 25 and serve as the boundary between the two. The length L of the second belt structure is 255±5mm, the width is 20±2mm and it has a double-layer reinforcement portion of 100mm arranged substantially in the center along the length direction, and the thickness is 1.5±0.2mm in the unreinforced portion and 2.2±0.2mm in the reinforced portion.

[0052] like Figure 4BAs shown, after being subjected to tensile force according to the EN 12492:2012 standard, the length of the second belt structure is about 275mm±5mm, and the second belt structure retracts but does not retract to its initial length, presenting an elongated state. This is because the first yarn 21 is a non-elastic yarn, so it also undergoes plastic deformation during the stretching process, so that after releasing a predetermined amount of tensile force, the main structure undergoes retraction (caused by the coil returning to its original state) and still has a certain deformation and elongation. At the same time, during the stretching process, the second yarn 22 is completely separated from the fixation to the main structure due to the mismatch with the elongation rate of the main structure, so that it can slide in the main structure. Since the single second yarn 21 is arranged in a serpentine shape, the sliding of the part of the second yarn at the compensation portion 27 toward the first bending portion and the first section 24 (i.e., tightening at the compensation portion) causes the compensation portion to curl. After the tensile force is released, the second yarn that cannot retract will at least partially protrude from the plane of the partially retracted main structure to form a coil, indicating that the belt structure has been stretched. At the same time, the curled compensation portion 17 cannot be largely unfolded due to the non-retraction of the second yarn, which can also indicate that the belt structure has undergone stretching.

[0053] Alternatively, the main structure can be obtained by weaving the first yarn in a double-sided weaving, jacquard weaving, etc. Preferably, in each of the aforementioned embodiments, the first material used for the first yarn can be an elastic yarn to allow the main structure to retract to its original length after a predetermined amount of tensile force is released, and can be selected from the following materials: polyester low-elastic yarn, polyester high-elastic yarn, spandex core-spun material, etc. In addition, the first material can also be a non-elastic yarn, that is, a material that cannot retract after stretching, such as polyester, polyamide, natural fibers (cotton, linen, silk and wool), other man-made fibers, such as viscose, acrylic, acetate, etc. Due to the plastic elongation of the yarns of these materials, the main structure woven therefrom still has a certain deformation elongation after retraction (caused by the coil returning to its original state).

[0054] Correspondingly, compared to the main structure, the second yarns 12, 22 embedded in the main structure have a tensile strength higher than 2N / tex and a low elongation at break between 2 and 5%. The second material used for the second yarns 12, 22 is ultra-high molecular weight polyethylene (UHMWP), liquid crystal polymer (LCP) or any suitable material. For example, 1000D LCP yarn has a tensile strength of about 2.1N / tex and an elongation at break of about 3.4%. For example, UHMWP yarn has a tensile strength of about 3.3N / tex and an elongation at break of about 4%. For example, Para-aramid yarn has a tensile strength of 2.08N / tex and an elongation at break of about 2.4%.

[0055] Figure 5A and Figure 5BSchematically shows the state of the third belt according to the present invention before being subjected to any tensile force and after being subjected to tensile force according to the EN 12492:2012 standard. Figure 5A As shown, similar to the first embodiment, the main structure 30 of the third belt is woven from the first yarn, so the specific weaving method is not shown; a plurality of second yarns 32 are woven straight to the main structure in a flat stitch manner, so that the second yarn 32 is flush with the main structure and at least partially fixed to the main structure. In the process of experiencing the tensile force, the main structure and the second yarn are deformed synchronously, that is, the elongation is the same, wherein the deformation of the main structure is mainly caused by the orientation deformation of its woven coils and the elongation caused by the straightening of the coils and possibly the deformation elongation caused by the deformation of the first yarn, and in contrast, the straight second yarn is plastically deformed by its own extension. Therefore, after the tensile force is released, the main structure can easily recover to its original length or only elongate due to the deformation elongation caused by the deformation of the first yarn, while the second yarn cannot recover to its original length, thereby becoming longer than the main structure, and can protrude from the plane of the main structure to form a failure indicator ring, so as to judge the availability of the belt, such as Figure 5B As shown schematically in FIG.

[0056] Preferably, the material of the first yarn of the main structure 30 can be the same as the material that can be used for the first yarn of the aforementioned embodiments. The difference is that since the second yarn 32 can be deformed synchronously with the main structure 30, the material of the second yarn 32 will be different from the second yarns 12 and 22 in the first and second embodiments, but will have high strength and high elongation at break, such as an elongation at break that is at least higher than the elongation of the main structure under a predetermined tensile force, such as not less than 30%, 45%, or 50%. In this embodiment, the material of the second yarn can be medium density polyethylene (MDPE) or high density polyethylene (HDPE) yarn or polyethylene (PE) yarn, for example, PE yarn has a strength of 2.6-4.2g / D and an elongation at break of up to 65%.

[0057] Figure 6 The schematic diagram shows an exemplary symmetrical arrangement of the failure indicator according to the present invention in the main structure of the belt, which can obtain different tensile strengths and maximum impact peak forces of the belt. For example, a second yarn is straightly embedded in each of the alternating rows of woven coils of the main structure (see Figure 6 left side); two second yarns are embedded straightly in each row of knitting loops of the main structure (see Figure 6 or two second yarns are respectively embedded straightly in the alternating rows of knitted loops of the main structure (see Figure 6 Right side). Similarly, the second yarn is stitched in a flat stitch, according to Figure 6In the arrangement shown, the second yarn is woven straight into the corresponding row of woven loops of the main structure. In addition, it is also possible to use each single second yarn to form a plurality of straight yarn portions embedded in the main structure by a serpentine arrangement or a zigzag arrangement, for example, instead of Figure 3 The single second yarn in the belt is arranged symmetrically on both sides of the longitudinal center axis of the main structure of the belt, and each second yarn is arranged Figure 3 The serpentine arrangement shown in forms three straight embedded parts. Alternatively, a plurality of second yarns without twist or with twist are integrated into the main structure in a weft insertion manner and fixed to the main structure in this state. As will be understood by those skilled in the art, the number of second yarns embedded or woven into the main structure and their arrangement can be selected as required.

[0058] In a further preferred embodiment of the present invention, the second yarn 12, 22, 32 may be scaled or different colors may be set in different sections. For example, in the case where such a belt is applied to a suspension system of a helmet, after the tensile force is released, the stress condition, such as the strength of the force, can be evaluated according to the change in the scale or the change in the length of different sections. It will be understood that more and / or larger protruding loops indicate a greater tensile force, thereby being able to reflect the impact level experienced.

[0059] Preferably, the color of the second yarn is different from the first yarn so as to distinguish the two. For example, the first yarn is black, white, etc., and the second yarn is yellow, red, etc., and vice versa.

[0060] According to another embodiment of the present invention, there is provided a safety helmet, which includes a cap body and a suspension system attached to the inside of the cap body, wherein the suspension system includes a plurality of straps connected with a cushion to form a structure covering the head, wherein at least one of the plurality of straps is formed by a strap with a failure indicator according to the present invention, such as the first, second and third straps mentioned above, so that the suspension system can not only play a buffering role when subjected to tensile force, but also indicate whether the suspension system has experienced an impact. Preferably, the plurality of straps are all formed by straps with a failure indicator and are symmetrically arranged in the cap body. Preferably, the length of at least one pair of the plurality of straps is different from that of the other straps, and the at least one pair of straps has a second yarn arrangement different from that of the other straps. Typically, the vertical spacing between the cushion and the cap body is 25 to 50 mm, so preferably, the elongation of the strap can be designed to ensure that the cushion of the suspension system does not contact the cap body. For example, for Figure 2A In the belt structure, since the deformation of the second yarn is very small, the elongation of the belt can be limited by designing the total length of the compensation portion 17 (i.e. the total length of the second yarn in this portion). In other words, the elongation of the belt is controlled by designing the length of the second yarn.

[0061] Those skilled in the art will appreciate that other safety devices can also be constructed from a belt with a failure indicator to indicate whether the safety device has experienced an impact. For example, the safety device can be a safety harness worn on a person, which is connected to a high anchor point to protect the person from falling from a height by preventing the person from falling. The safety harness is composed of a plurality of belts connected together, at least one of which is formed by a belt with a failure indicator. For another example, the safety device can be a safety rope, which is formed by a belt with a failure indicator.

[0062] The present invention also provides a method for manufacturing a belt having a failure indicator, comprising:

[0063] a) providing a first yarn;

[0064] b) providing a second yarn;

[0065] c) weaving the first yarn to form the main structure of the belt and making the second yarn integrated straight into the main structure and extending the entire length of the main structure, and

[0066] d) at least partially securing a second yarn to the body structure;

[0067] Wherein, the main structure and the second yarn are selected to stretch without breaking under a predetermined amount of tensile force, and after the tensile force is released, the main structure retracts so that at least one second yarn can at least partially protrude from the plane of the main structure to form a failure indicator circle.

[0068] The weaving of the belt adopts a fully automatic double needle bed flat knitting machine. The process is as follows: Figure 7 As shown:

[0069] In the non-reinforced structure, a row of single-sided coils and a row of double-sided coils are used to weave the first yarn in one cycle, and the second yarn is interspersed in each row or alternate rows of double-sided coils. In the reinforced structure, all double-sided coils are used, and the second yarn is interspersed in each row or alternate rows of double-sided coils.

[0070] Preferably, in step c, the first yarn is woven in a plain weave, double-sided weave, jacquard weave or the like manner to form a main structure, so that the elongation of the main structure under a predetermined amount of tensile force is basically caused by the orientation deformation of the woven coils and the straightening of the arcs.

[0071] Preferably, the method further comprises: in step b, winding a hot melt wire on the second yarn, preferably, the twist thereof is 6 to 10 turns / cm, and in step d, heating the tape to melt the hot melt wire to fix the second yarn to the main structure. The hot melt wire is a low melting point hot melt wire with a melting point of 80 to 130°C, such as a nylon hot melt wire. Therefore, the step of heating the tape is performed by applying a temperature of 80 to 130°C to the tape, and the temperature application can be achieved by steaming ironing or heat setting. In addition, other methods can be used to fix the second yarn to the main structure, for example, fixing the second yarn to the main structure by an adhesive.

[0072] Preferably, the method further comprises: after step d, folding each end of the strip and fixing it in the middle with stitches to form a first bending portion and a compensation portion.

[0073] The present invention realizes a simple, non-electronic, cost-effective and reliable solution, which can easily visually determine whether the belt and the safety device including it have been subjected to an impact through the second yarn. In addition, since the second yarn is embedded in the main structure of the belt, it can avoid breakage due to wear. Furthermore, the elongation of the belt can be controlled by designing the compensation part (i.e. the length of the second yarn in this part) to achieve better protection.

[0074] The foregoing description is merely illustrative in nature and is not intended to limit the present disclosure, its application or use in any way. The broad teaching of the present disclosure can be implemented in various forms. Further, although each of the embodiments is described as having certain features above, any one or more of those features described with respect to any embodiment of the present disclosure can be implemented in the features of any one of the other embodiments and / or implemented in combination with it, even if the combination is not explicitly described. In other words, the described embodiments are not mutually exclusive, and one or more embodiments and the arrangement of each other are still within the scope of the present disclosure. Therefore, although the present disclosure includes specific examples, the true scope of the present disclosure should not be so limited. Those skilled in the art can make various modifications based on the teachings of the present invention without departing from the scope and spirit of the present invention.

Claims

1. A belt having a failure indicator, comprising: The main structure formed by weaving; and one or more second yarns, which are integrated into the main structure straightly along the length direction of the main structure over the entire length of the main structure and are at least partially fixed to the main structure, Wherein, the main structure and the second yarn are selected to stretch without breaking under a predetermined amount of tensile force, and after the tensile force is released, the main structure retracts so that at least one second yarn at least partially protrudes from the plane of the main structure to form a failure indicator circle.

2. The belt according to claim 1, wherein Under the action of a predetermined amount of tensile force, the elongation of the main structure is greater than the elongation of the second yarn, so that the second yarn is detached from the fixation to the main structure and can slide in the main structure; when the tensile force is released, the main structure retracts, and the second yarn does not retract due to plastic deformation, so that the length of the main structure is shorter than the length of at least one sliding second yarn, so that the at least one second yarn at least partially protrudes from the plane of the main structure.

3. The belt according to claim 1, wherein Under the action of a predetermined amount of tensile force, the second yarn deforms synchronously with the main structure, and after the tensile force is released, the length of the main structure after retraction is shorter than the length of at least one second yarn that undergoes plastic deformation, so that the at least one second yarn protrudes at least partially from the plane of the main structure.

4. The belt according to any one of claims 1 to 3, wherein The material of the first yarn forming the main structure can be selected from any of the following: polyester fiber, polyester low-elastic yarn, polyester high-elastic yarn, spandex core-spun material, polyester, polyamide, natural fiber, viscose, acrylic fiber and acetate fiber, and can be different in color from the second yarn.

5. The belt according to claim 1 or 2, wherein: The tensile strength of the second yarn is above 2.0N / Tex, and the elongation at break is in the range of 2-5%. The maximum tensile force of the main structure is not less than 800N, and the elongation is in the range of 15%-35%.

6. The belt according to claim 3, wherein The material of the second yarn may be medium-density polyethylene, high-density polyethylene yarn, or polyethylene.

7. The belt according to claim 1 or 2, wherein: The belt has a compensating portion capable of compensating for a difference in elongation between the main structure and the second yarn under a predetermined amount of tensile force.

8. The belt according to claim 7, wherein The compensation portion is formed by forming a bent portion at the end of the main structure.

9. The belt according to any one of claims 1 to 3, wherein The one or more second yarns are formed from a single yarn that is arranged in a serpentine manner and turns at the end of the main structure.

10. The belt according to any one of claims 1 to 3, wherein The fixing of the second yarn to the main body portion is achieved by at least partially wrapping the second yarn with a twist of 6 to 10 turns / cm using a hot melt or by using an adhesive.

11. A safety device comprising a component consisting of a belt having a failure indicator according to any one of claims 1 to 10, so as to facilitate judging whether the safety device has been damaged.

12. A safety helmet comprising a helmet body and a suspension system attached to the interior of the helmet body, the suspension system comprising a plurality of straps connected with a cushion to form a structure covering the head, wherein: At least one of the plurality of straps is formed by a strap according to any one of claims 1 to 10, so that the suspension system can not only play a buffering role when subjected to tensile forces, but also indicate whether the suspension system has experienced an impact.

13. A method of making a belt having a failure indicator, comprising: a) providing a first yarn; b) providing a second yarn; c) weaving the first yarn to form a main structure and making the second yarn integrated straight into the main structure and extending the entire length of the main structure, and d) at least partially securing a second yarn to the body structure; Wherein, the main structure and the second yarn are selected to stretch without breaking under a predetermined amount of tensile force, and after the tensile force is released, the main structure retracts so that at least one second yarn can at least partially protrude from the plane of the main structure to form a failure indicator circle.

14. The method according to claim 13, wherein: In step c, the first yarn is woven in a plain weave, a double weave, or a jacquard weave manner to form a main structure.

15. The method according to claim 13, further comprising: In step b, a thermal fuse is wrapped around at least a portion of the length of the second yarn, and in step d, the tape is heated to melt the thermal fuse to at least partially secure the second yarn to the main structure.

16. The method according to claim 15, wherein: The melting point of the thermal fuse is 80-130° C. and the twist is 6-10 turns / cm.

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