Fastening unit from woven force strip and woven force strip for manufacturing of fastening units

FIELD: textile fabrics; paper.

SUBSTANCE: group of invention relates to fastening units made of woven strips. Fastening unit made of woven force strip is implemented from aramid fibers and forms fastening element in the form of loop or joint of two strips, broached lengthwise strip by sewing stitches. Sections for sewing stitches of such strip allows higher density by basis, and section without sewing stitches - lower, herewith by sewing stitches there are broached sections of strip, allowing higher density by basis. Woven force strip for manufacturing of fastening units is implemented from aramid fibers, herewith strip allows at least two, located lengthwise strip and symmetrical relative to its longitudinal axis, tightened sections for sewing stitches.

EFFECT: invention provides creation of such fastening unit made from woven force strip, in which it is taken into account interconnection between kind of fibers and density parametres of woven strip at definition of parametres of sewing stitches, fastening parts of force strip, forming fastening unit, with keeping of linear dimensions of strip (width and thickness), not requiring changing of dimensions of fixed on strip fittings used in equipment, and also creation of corresponding woven strip, providing manufacturing of fastening unit, agreeable to the mentioned conditions.

2 cl, 6 dwg, 1 tbl

 

Group of inventions relates to fastening the knots woven tapes for special purposes, perceiving in the operation of the longitudinal force load, and also woven to the power strip for the manufacture of fixing nodes.

Known suspension system of a parachute containing the main circular strap with adjustable buckles, back-shoulder girth buckles, breast jumper and foot girth, United in a waist lock, with the main circular strap is made of upper and lower parts, the upper part is provided with an additional tape along the back and the mud on the buckle back-shoulder girth, additional bracket located in the region of the chest, and two unregulated buckles, on which she closed and the lower part is equipped with one fixed buckle, with its lower end closed by unregulated buckle, and the upper pass through window non-adjustable buckles at the top of the circular strap and snap to its adjustable buckles, in addition, through the open bottom unregulated buckles are also foot girths, one ends of which are closed by adjustable buckles, and others - in belt lock, which is locked chest jumper passed through an additional bracket on the main circular strap.

This pendant parachute system the mA is made of woven power strips, forming fasteners by stitching folded double tape with loops under the buckle. The width of the woven power strips and the width of the buckles related condition for passing the belt through the buckle with the exception of the possibility of Curling ribbon in the buckle. The structure of the woven tape is not disclosed and forms of sewing stitches not shown, that allows to judge about the use in hanging parachute system model of woven strips of synthetic fibres used in the manufacture of parachutes, Pat. Of the Russian Federation No. 2175299, IPC B64D 17/30, 2001

Such power woven tape, forming fasteners used in automotive seat belts, Pat. U.S. No. 6517154, IPC B60N 2/28, 2002, U.S. Pat. Germany No. 4005563, IPC AV 35/04, 1991

Known fastening site of the woven power belt and parachute sling attachment site of the woven power strip which is folded in half with the formation of the end loops and stitched sewing stitches. Power strip goes into the strap chute and can be a part of in the case of manufacturing lines as a continuation of the fixing site of the same woven tape. This system parachute suspension is designed to airdrop of cargo and is not intended for use as a harness of a parachute for a person in the absence of buckles and the possibility of fitting the parachute straps for a specific man is ka, pilot or paratrooper, Pat. U.S. No. 5472155, 1995

There are other types of fastening sites of power textile braided ropes, but this type of connection is not used in parachute suspension systems, U.S. Pat. U.S. No. 5062344, IPC D04C 1/12, 1991, U.S. Pat. U.S. No. 4974488, IPC D04C 1/12, 1990

There are also other various suspension system of parachutes that use the power of woven tape, forming fasteners, publ. application U.S. No. 2005/0269457, IPC B64D 17/00, 2005, U.S. Pat. China No. 2666811, IPC B64D 17/24, 2004

The closest in purpose and design, and chosen as the prototype is the attachment site of the woven power tape, and woven power strip as disclosed in U.S. Pat. U.S. No. 4684082, IPC B64D 17/02, 1987, Known parachute sling is used in the suspension of the parachute intended for a man, made of woven power tape, which forms at the expense of sewing stitches fastening the node for the connection with elements of the parachute suspension. Woven power strip can be attached to the parachute suspension, also made of woven, using sewing threads, forming various shapes of the joining node: T-shaped, U-shaped, and others. Sewing the stitches in the known mounting site located along the tape around the edges of the definitions woven power tape, it has a warp and weft, and in the description noted that the Eastern Sayan MTS is woven tape made of materials having the trade name DACRON or KEVLAR.

The material under the trade name DACRON is a polyester fiber, and the material under the trade name KEVLAR is polyparaphenylene with high tensile strength.

In Russia the thread of similar materials produced under the symbol - string CBM (aramid yarn), for example thread technical SVM-N neutral on THE 2272-018-51605609-2000, date of introduction 2001

Peculiarities of structural and density characteristics of the power strip, including the endless belt power belt during the formation of the fixing unit, which is not considered in the known sources of information and not the task of preserving the integrity of the work when changing the material of the filaments of the tape while maintaining the linear dimensions of the power tape.

The objective of the invention is the creation of such a mounting site of the woven power tape, which takes into account the interdependence between the form of threads and parameters density woven tape when sewing stitches fastening part of the power of the tape forming the mounting site, while maintaining linear tape dimensions (width and thickness), does not require changes of the sizes used in the equipment hardware (clasps, locks, clasps and the like)mounted on the tape, and woven ribbon allows you to produce the holding node, meet the above conditions.

It is known that the strength of the sewing connection in all the tapes in the manufacture of fastening loops or when joining two strips or dock ribbon and fabric may not be equal to the strength of spliced tape and is 85-90% of the strength of spliced tape. This is due to many factors:

- the destruction of the textile yarn woven ribbon sewing needle;

- the impossibility of perception sewing connection stitches tensile loads evenly with abutting parts of the tape;

- shifting and slippage sewing thread in the body of the tape when a change in the structure of the tape due to tensile loads.

Russian industry produces high-strength aramid textile yarn RAS thickness of 14.3-58.8 Tex and strength 170-190 CN/Tex, which produce a wide range of tapes for parachute systems.

Currently mastered the production of aramid yarn under the trade name Rusar, which at the same thickness of the thread, and that thread SVM has a breaking elongation is almost equal to the thread RAS, and the strength is much higher, up to 240 CN/Tex, for example thread Rusar neutral in THE 2272-023-51605609-2001, date of introduction 2001

Replacement power strips thread synthetic thread Rusar reduces the mass of the tape by 15-25%, while retaining the breaking load at the level of the tape from the threads RAS that POS is s significantly reduce the mass of parachute systems and the amount of their placement in a Packed parachute.

Replacement thread synthetic thread Rusar should be done without changing the widths of the tapes, not to change the hardware parachute suspension, such as buckles, used for adjusting the suspension to a specific person, docking locks, hooks for hanging accessories and other fastening elements.

Thus, the main task consists in the following:

no significant changes in the design of the fastening knots woven tapes, used and implemented including aviation, in particular in systems parachute suspension, but to ensure the transition from the thread synthetic thread Rusar in woven tapes used for the manufacture of products for special technical purposes.

Weight belts when using threads Rusar the same thickness as the threads of the RAS, is by reducing the number of warp threads. Reducing the number of warp threads (15-25%) while maintaining the width of the ribbon leads to a significant change in the structure of the tape, the decrease in the density of the tape on the basis that, in turn, inevitably leads to a decrease in strength sewing seam by 20-25% compared with the strength of spliced tape. Comparative characteristics of the films are presented in table 1.

Table 1
Changing the strength of the sewing seam, depending on the density on the basis of joined woven power tapes
Name tapesThe breaking load of the tape, kgfThe density of the tape base, n/1 cmThe breaking load of the tape, kgf
Ltssm - 48-600072001506500
Ltros - 48-600074001285700

Ltssm - 48-6000 tape technical a width of 48 mm and a breaking load of not less than 6000 kg;

Ltros - 48-6000 tape technical under the trade name Rusar a width of 48 mm and a breaking load of not less than 6000 kg.

The technical result, which is aimed invention is to preserve the strength of the tape when reducing the number of warp and maintaining the width of the tape, strength sewing seam at the level of 85-90% on the strength of spliced tape when using threads Rusar and obtaining thus possible not to change the structural components (locks, hooks, etc), including the parachute harness or other systems that use the power of woven tape.

EIT is the location of the sewing lines across the width of the tape, as the joints in fastening the knots are made on sewing machines and, therefore, in exact locations across the width of the tape, where it passes sewing stitches to keep the density on the basis of the same as in strips of yarn RAS.

The essence of invention is as follows.

The mounting site of the woven power tapes are made of aramid yarns and forms a fastening element in the form of a loop or junction of two ribbons sewn along the ribbon sewing stitches, and as aramid yarns used thread Rusar linear density of 14.3-58.8 Tex and having the strength 230-240 CN/Tex, the areas under the sewing lines woven tapes have a density on the basis of from 10 to 25% greater than the density on the basis of plots without sewing stitches while sewing stitches stitched areas of the tape that has a higher density on the canvas.

Woven power strip for the manufacture of fastening knots made of aramid filaments, the aramid yarns used thread Rusar linear density of 14.3-58.8 Tex and having the strength 230-240 CN/Tex, the tape has at least two points along the tape and symmetrically relative to its longitudinal axis compacted area under garment line, having a density on the basis of from 10 to 25% greater areas of the tape located on the sides of the compacted plots, on the basis of.

the essence of the invention is illustrated by drawings, where:

figure 1 shows the mounting site of the woven power tape, forming a retaining loop by bending the ribbon and stitching parts of three sewing stitches;

figure 2 shows the mounting site of the woven power tape, forming a mounting site by joining the ends of two tapes made three sewing stitches;

figure 3 shows part of the parachute straps with mounting site of the woven power ribbon, sewn on three sewing stitches to the woven tape included in the harness of a parachute (the latter in full not shown in the figure, but it has a traditional design, as, for example, in the above analogs in U.S. Pat. Of the Russian Federation No. 2175299 or Pat. U.S. No. 4684082;

figure 4 (a, b) depicts a cross-sectional view of the fastening element in the case of the connection of figure 1 with the seal on the basis of the calculation of the three threads (position a) and from the calculation of the seals on the four warp threads (position b).

figure 5 shows a top view and section a-a along the warp threads of the fastener, sewn five sewing stitches connecting joints, tapes and transferring to the unjoined parcels tapes. This arrangement sewing stitches forms a strong connection tape in the joints. Adopted to manufacture the product from the belt width of 501 mm and at the junction length 360 mm, the length of the sections of the ribbons, sewn neck stitches after joint sostavljaet mm

The number of sewing stitches can be different and depends on the initially set load parameters. Preferred is the location of the stitches (sewing stitches) along the edges of the tape, and if they increase the symmetrical arrangement of additional stitches on the two extreme or relative to the Central sewing stitch.

Specific type of sewing stitch (zigzag - figa or direct - figb) is determined from the condition of obtaining reliable sewing connection having a smaller degree of dissolution when thread breakage and is selected depending on the purpose (for use as a power tape on land use in the form of traction belts or for use in parachute systems for which reliability is much higher).

The mounting site of the woven power tape 1 made of aramid yarns and is a fastening element in the form of a loop 2 or junction of two tapes 1 and 3, sewn along the ribbon sewing stitches 4.

As aramid yarns used thread Rusar a linear density of

14,3-58.8 Tex and having the strength 230-240 CN/Tex.

Sections 5 passing sewing lines woven tape 1 have a density on the basis of from 10 to 25% greater than the parts 6 without sewing stitches while sewing stitches 4 stitched areas of the tape that has a higher density on the Nova.

The mounting site for 3 parachute straps has a fastening element, which is sewn to the woven tape 6 of the harness of a parachute three sewing stitches 4, each of which is stitched only the corresponding plot of the power tape 1 fixing node.

In figure 4, the warp threads are indicated by position 7, and the weft yarn - item 8.

Example comparative zastrocky joints (figure 5) tapes Ltssm-50-7000 (ribbon from technical fibres RAS width of 50 mm and a breaking load of not less than 7000 kgf) and tape Ltros-50-7000 (ribbon from technical fibres Rusar width of 50 mm and a breaking load of not less than 7000 kgs):

1. Frequency steps zigzag lines on 100 mm - 24.

2. Raskida lines - 5 mm

3. Sewing thread RAS-118 I.

Tape Ltssm-50-7000 has a weave broken twill 3/1,1/3; in the ribbon 804 main thread 58.8 Tex-bound six for one, the density on the basis of 160 n/cm with uniform probike main threads in the reed No. 40 (probike 22 tooth); the breaking load tape 7900 kg, tensile load joint tape 7100 kgs.

Tape Ltros-50-7000 has a weave broken twill 3/1,1/3; in the ribbon 696 main thread-bound six per; variable density on the basis of obtained due to non-uniform probosci main threads in the reed No. 40 (probike 22 tooth): 1 tooth 3 galeva, 1 tooth 4 galeva; 2 tooth 7 heddles; 2 tooth 4 galeva; 2 tooth 7 heddles; 2 tooth 4 galeva; 2 tooth po heddles; 2 tooth 4 galeva; 2 tooth 7 heddles; 2 tooth 4 galeva; 2 tooth 7 heddles; 1 tooth 4 galeva, 1 tooth 3 galeva, the density on the basis of the five areas probosci 7 heddles in the tooth - 160 n/cm (under the sewing lines), and the other parts of the tape - 138 n/cm; tensile load tape 7980 kg, tensile load joint tape 7200 kgs.

The mounting site of the woven power tape can be manufactured in different versions, with one loop, two loops may be coupled between a combination of belt loops.

Woven power strip allows the manufacture of fasteners and parachute straps and other flexible traction device used for towing vehicles.

1. The mounting site of the woven power belt made of aramid yarns and forming a fastening element in the form of a loop or junction of two ribbons sewn along the ribbon sewing stitches, characterized in that as aramid yarns used a filament linear density of from 14,3 to 58.8 Tex and having a strength of from 230 to 240 CN/Tex, the areas under the sewing lines woven tapes have a density on the basis of from 10 to 25% greater than the density on the basis of plots without sewing stitches while sewing stitches stitched areas of the tape that has a higher density on the canvas.

2. Woven power strip for the manufacture of fastening units, made from aramid n the TEI, characterized in that as aramid yarns used a filament linear density of from 14,3 to 58.8 Tex and having a strength of from 230 to 240 CN/Tex, the tape has at least two points along the tape and symmetrically relative to its longitudinal axis, compacted area under garment line, having a density on the basis of from 10 to 25% greater than other parts of the tapes that are located laterally compacted plots.



 

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