CA1059959A - Seat belt webbing construction - Google Patents
Seat belt webbing constructionInfo
- Publication number
- CA1059959A CA1059959A CA257,827A CA257827A CA1059959A CA 1059959 A CA1059959 A CA 1059959A CA 257827 A CA257827 A CA 257827A CA 1059959 A CA1059959 A CA 1059959A
- Authority
- CA
- Canada
- Prior art keywords
- shoulder
- waist
- section
- warps
- belt
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R22/00—Safety belts or body harnesses in vehicles
- B60R22/12—Construction of belts or harnesses
- B60R22/16—Construction of belts or harnesses using belts which become permanently deformed, i.e. one time use
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D1/00—Woven fabrics designed to make specified articles
- D03D1/0005—Woven fabrics for safety belts
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Mechanical Engineering (AREA)
- Woven Fabrics (AREA)
- Emergency Lowering Means (AREA)
- Automotive Seat Belt Assembly (AREA)
Abstract
SEAT BELT WEBBING CONSTRUCTION
ABSTRACT OF THE DISCLOSURE
A seamless combined vehicle safety shoulder and waist belt has a shoulder section which is plastically elongatable and of high energy absorption, and a waist section of high tensile strength. The shoulder section is thinner than the waist section, the shoulder section including weft interwoven warps and linear core warps enclosed between the opposite faces of the shoulder section, and the waist section includes all of the shoulder section warps and additional warps, all the waist section warps being interwoven with wefts. In producing the belt, it is continuously woven with successive alternate waist and shoulder sections, the warps which form the waist sections and not in the shoulder sections floating in the shoulder sections and being thereafter severed proximate the areas of junction.
ABSTRACT OF THE DISCLOSURE
A seamless combined vehicle safety shoulder and waist belt has a shoulder section which is plastically elongatable and of high energy absorption, and a waist section of high tensile strength. The shoulder section is thinner than the waist section, the shoulder section including weft interwoven warps and linear core warps enclosed between the opposite faces of the shoulder section, and the waist section includes all of the shoulder section warps and additional warps, all the waist section warps being interwoven with wefts. In producing the belt, it is continuously woven with successive alternate waist and shoulder sections, the warps which form the waist sections and not in the shoulder sections floating in the shoulder sections and being thereafter severed proximate the areas of junction.
Description
BACKGROUND OF T~E INVENTION
The present invention is concerned with a novel seat belt assembly for use in vehicles, having rich energy absorbing property and by which the retracting amount by the retractor is increased, thereby promoting use of the retractor.
The seat belts have generally been employed to mitigate mechanical shocks to the passengers of vehicles such as automobiles and air craft resulting to provide safety performance. The seat belts of this sort were so far studied from various aspects and angles, and many proposals were so far presented.
In the early days, the belts were manufactured in two-point type to hold only the waist, but to attain more reliable safety ~059959 performance, the belts were made in three-point type having an additional belt to hold the shoulder. In recent days there has been proposed the belts of the type in which the waist belt and the shoulder belt are made in a continuous form. The belt system of the aforesaid continuous type has an advantage that they need just only less retractor units than retractor units required by the aforesaid three-point type belt system. The modern trend, however, has been placing increasing demand for the belts to provide moxe energy absorption, which has resulted in the use of shoulder belts having large absorption of energy. However, the belts of the aforesaid continuous type have to be made by joining together an ordinary belt and a belt having high energy absorption. Hence the joined place gives an uncomfortable touch feeling to the human body, and comes into contact with the guide members of the retractor when the belt is ~ being taken up along smooth retracting movement. It is~ thexefore, desired to make the belt with a single woven fabric without seams to improve the aforementioned defects. At present, however, to make such a belt is technically difficult and no satisfactory solution has been found.
In recent years, increased concern with regard to the improve-ment of retractors has resulted in the manufacture of retractors of various types. Such retractors, however, have all been design based on a prerequisite that the thickness of the belt is equal along the lengthwise direction, thereby imposing a limit to the amount of taking up the belt. To increase the take-up amount, the retractor must have increased volume~ losing economy in spac~ particularly when it is used for the vehicles having narrow room. This is a fatal defect of the belt of the aforementioned continuous webbing type, losing the balance of whole parts of the vehicle. From such view-g point, it is an important assignment to increase the take-up space just with using a retractor of an ordinary size.
SUMMARY OF THE INVENTION
The inventor of the present invention has conducted extensive study in an effort to solve the aforementioned defects by giving attention to the aforesaid various points, and has found an effective means by which the belts can be formed continuously as a single unit based on the characters required for the shoulder belt and the waist belt, It is known, in general, that the shoulder belt requLres less tensile strength than the waist belt. For example, the waist belt requires a tensile strength of more than 2700 kg, whereas the shoulder belt requires only tensile strength of up to 1800 kg.
Particularly, it was confirmed by experiments conducted by the U.S.National Highway Transport Safety Agency (NHTSA) that where a belt having property to absorb energy is used for the shoulder belt, the tensile strength needs not necessarily be 1800 kg, but may be sufficient if the belt has a tensile strength of 500 kg. It is, therefore, recognized that the shoulder belt may have less thickness than that of the waist belt and may have less strength to sufficiently attain the desired object.
10S995~
The seat belt of the present invention was designed under the above said situations and comprises a seamless and continuous webbing having a belt to hold the waist and a belt to hold the shoulder, characterized in that ~he belt portion of holding the shoulder of said webbing is thinner and has less strength than the waist portion of the belt, and further has an extension property that does not restore to the initial state under a certain load condition that substantially causes the belt to extend by a certain length.
The present invention provides a combined vehicle safety belt shoulder and waist section structure in which the shoulder and waist sections are woven of warps and wefts and possess different strength and elongation properties. The shoulder section is thinner than the waist section, and the shoulder and waist sections possess a plurality of common continuous warps some of these continuous warps having high energy-absorbing pro-perties and possessing a greater weave crimp in the waist section than in the shoulder section and the waist section possessing a greater number of warps than the shoulder section.
There is also provided a method of producing this combined safety belt comprising weaving a continuous band inclu-- ding successive alternate shoulder and waist sections in which a plurality of warps interwoven in the waist section float in the shoulder section, severing the floating warps and severing the band at alternate junctions of the waist and shoulder sections.
In a further embodiment, the present invention provides a seat belt for vehicles comprising a seamless and continuous webbing, wherein a belt which holds the waist and a belt which holds the shoulder is formed of a seamless and continuous webbing, characterized in that the shoulder portion (1) of the webbing is thinner in thickness than the waist portion (2) of the same webbing and has an extension property that does not restore to the initial f` ~ -4-~059959 state under a certain load condition that substantially causes the belt to extend a certain length, and the waist portion (2) of the webbing has a greater number of warps than the shoulder portion whereby the waist portion has larger strength than the shoulder portion (1~.
The invention is illustrated below with reference to a concrete embodiment shown in the accompanying drawingsO But it should be noted that the present invention is not restricted to the below mentioned embodiment only but permits various design modifications without departing from the objects of the present inventionO
BRIEF DESCRIPTION OF THE DRAWINGS
Figo 1 is a perspective view showing an example of using the seat belt of the present invention.
Figo 2 is a partially omitted perspective view showing the appearance of the seat belt of the present invention.
Figo 3 is a diagram showing an example of the texture of the waist belt of the seat belt of the present inventionO
Figo 4 is a diagram to show an example of the texture of a selvage of the seat belt of the present invention.
Fig. 5 is a vertical cross-sectional view showing the texture of Fig, 3 of the waist belt of the seat belt of the pre-sent inventionO
'. J
Fig. 6 is a diagram showing an example of the texture of the shoulder belt o~ the seat belt of the present invention.
Fig. 7 is a vertical cross-sectional view showing the texture of Fig. 6 of the same seat belt.
Fig. 8 is a vertical cross-sectional view showing the texture at the boundary part of the waist belt and the shoulder belt of the seat belt of the present invention, and Fig. 9 is a diagram showing curves of load and extension of the waist belt and the shoulder belt of the seat belt of the present invention.
DESCRIPTION OF THE PREFERRED E~ODIMENTS
Fig. 1 shows a diagram to illustrate an example in which a seat belt of the present invention is employed, in which the reference numeral 1 stands for a shoulder belt~ and the re~erence numeral 2 represents a waist belt. These two belts 1 and 2 form a belt made of a single continuous webbing via a boundary part 3 as shown in Fig. 2. The shoulder belt 1 is thinner than the waist belt 2. The belt composed of these shoulder belt l and waist belt 2 will usually have a retractor 4 and a fastening fitting 5. The belt is passed through a slidable tongue piece 6 locating as a middle suspending matter; the slidable tongue piece 6 will be en-gaged with a buckle 7 which is suspended to an anchorage hole 8 selected within the vehicle inside. The reference numeral 9 is a member to guide and direct the shoulder belt position 1 that was pulled out from the retractor 4 fixed on some place of the :1059959 side wall. The member 9 is not necessary if the retractor is provided here at this position. Also, the reference numer~llO
represents a seat in the vehicle.
Figs. 3 to 5 are diagrams to show an example of weaving waist belt 2, Fig. 6 and 7 are diagrams to show an example of a woven texture of the shoulder belt 1, and Fig. 8 shows an embodiment of a texture at the boundary part 3 between portion belt 1 and 2. In the drawings~ the reference numerals 11, 12, 13, 14, 15 and 16 are warps in a complete texture. The above warps are arrayed in many number in parallel, and to both sides thereof are added warps 21, 22, 23 and 24 having selvage shown in Fig. 4 to determine the belt width of the present invention. The reference numerals 31 and 32 are warps having smaller elongation than the warps 11 to 16. Further, the reference numerals 41, 42, 43, 44, 45 and 46 are wefts in the waist belt 2, and the reference numerals 51, 52, 53, S4, 55, 56, 57 and 5~ are weftsin the shoulder belt 1.
In Figs.3 to 5, the aforesaid warps 11 to 16 and 31, 32 are crossed and interlinked by the wefts 41 to 46 by way of triple weaving shown in Fig. 3 to form the waist belt 2. In this case, the selvage texture shown in Fig. 4 is added to both sides of fabrics in Fig. 3O In Figs.6 and 7, the warps 11, 12, 14 and 15 among the warps 11 to 16 and 31, 32 in the aforesaid waist belt 2 are crossed and interlin~ed together with the wefts 51 to 58 and double weaving of wefts diagramatized in Fig. 6 and further the warps 13 and 16 are fioated, without being woven and arrayed in parallel, lOS9gS9 outside of the aforesaid crossed and bonded texture. The warps 31, 32 are crossed and interlinked with the wefts in the afore-said waist belt 2, and are running as core yarns being retained inside of the texture composed of warps 11, 12, 14, 15 and S wefts 51 to 58, as seen in Fig, 7; the warps 31, 32 are not exposed outside of the texture. As mentioned above, the fabric of the shoulder belt l of the present invention is formed by the interrelated fu~ tion among the warps 11, 16, 31, 32 and wefts 51 to 58.
The aforesaid selvage texture diagramatized in Fig.4 is also added to both sides of the shoulder belt 1. Here the aforesaid waist belt 2 and the shoulder belt 1 are constituted as a single continuous webbing without seam. In this texture, the boundary part 3 between the two belts l and 2 is shown in Fig. 8. That is, the warps 11, 12, 14, 15, 31 and 32 forming the waist belt 2 are taken over by the fabric of the shoulder belt 1. The floating warps 13 and 16 are cut away at a part A where they appear out of the fabric. The cut-away part is then removed appropriately, and the position A at the end is then dyed and transferred to the position B of Fig. 8, and then buried and retained in the texture of the waist belt 2. In this wayt a continuous seamless webbing isformed with the waist belt 2 and the shoulder belt 1 together. In the foregoing description9 the warps are preferably cut away in an amount within the range of 10 to 40~/O in relation to the thickness and strength of the belt, so that the thickness is reduced into appropriately favorable value relative to the thickness of the waist belt 2.
Although the foregoing description has dealt with the transfer from the waist belt 2 toward the shoulder belt 1, it should be noted that the webbing of the present invention is made for manufacturing a long ~xture in which the waist belt 2 and the shoulder belt 1 are repeated alternately; the same structure is rep eated from the shoulder belt 1 toward the waist belt 2.
However, here, as for the order of wefts, the weft 41 in place of we ft 46 in the waist belt 2 is woven next of the weft 58 of the shoulder belt 1. Materials of wefts and warps for use in the webbing texture of the present invention may be thermoplastic synthetic fibers such as nylon, vinylon, polyester, polyprene esters, and various fibers such as viscose rayon, cott on,-hemp,etc.
Among the above thermoplastic synthetic fibers, particularly preferred examples are nylon and polyester fibers. These fibers may often be employed by being mixed t ogether. The warps 31 and 32 that serve as core yarns may be made of a polyester fiber, vinylon, metallic fiber and glass fiber. Particularly preferred example may be a reformed fiber that is known as fiber B having less elongation. The core yarns, however, are selected best by comparison with the warps constituting the fabric.
The webbing by which the waist belt 2 and the shoulder belt 1 are connecte~ for a single unit, is terminated to the aforesaid retractor 4 and to the fastening fitting 5, and is used for a seat 1~59959 belt as shown in Fig. l. Also, in this case, the mounting positions of the retractor 4, fastening fitting 5, buckle 7 and indoor member 9 cannot be limited to the positions shown in Fig. l but may be mounted at any appropriate positions. In the present invention, in particular, the shoulder belt l is thin and is allowable to be mounted directly on the seat lO, - which possibility is an advantage of the belt of the present invention.
When mechanical impact is applied to the aforementioned seat belt, the waist belt 2 havir.g large strength and thickness securely holds the human body, and the shoulder belt l which is made thin and has smaller strength undergoes stretch easily when the impact is applied, whereby the core yarns are broken step by step in order, and then the determined load is reached and further acting point exten~ to a set point P shown in Fig. 9 to absorb the energy exerted on the human body. Fig. 9 shows this state, wherein the load and extending elongation degree exerted on the waist belt 2 as measured under the Standard, isdiagramatized in . .
diagram (a). The diagram (a) shows less degree of elongation and less work done. However, if the elongation of the shoulder l is set at 30%, for example, under a determined load of 300 kg, -the core yarns will be broken down step by step at around 300 kg loadèd, so that the flat portion such as in the diagram (b) may continue from an extension degree about 4 to 8% started to a set point P of about 30% indicated there. Furtherl if the loading is increased lOS9959 up to 1130 kg speci~ied value under the Spec. MVSS, the extension reaches about 45%, at which the belt does not restore to the initial state (length) even after the load o~ 1130 kg is removed;
the amount of work done is very large as compared to that of the waist belt 2. From the abovementioned fact, even a single continuous seamless webbing has the performance being comparable to a conventional three-point type seat belt employing energy-absorbing belt ~or a shoulder belt. The fact proves that the seat belt by the present invention has excellent performance.
Here the aforementioned predetermined load and set point will be selected depending upon the waist belt 2 and the shoulder belt 1 of the belt over the range of 150 to 1000 kg and from 20~/. to 40% of the point P.
As mentioned above, the seat belt of the present invention is made of a continuous and seamless webbing including the waist portion 2 and the shoulder portion 1, contributing to reduce the number of retractorsthat will have to be installed in the vehicle room.
Moreover, since the webbing of shoulder portion 1 can be made thin and can be taken up by the retractor, it is allowed to make the retractor in small size or to have both the shoulder portion 1 and the waist portion 2 contained in a conventional retractor case.
Therefore, in addition to reducing the number of retractors to be used, reasonable use of the retractor can be promoted and the seat belts can be attached to the vehicle room properly. In addition, the seat belt by the present invention, which is made of a single seamless and continuous belt, exhibits excellent performance to absorb energy which is comparabl to conventional three-point type energy-absorbing belts. Besides, the belt by the present ~ in~vention without seams permits the slidable tongue piece to slide smoothly, so that said slidable tongue piece can be retained at any proper and balanced positions to fasten the belts.
In case of collision, the impact due to the collision is dispersed between the waist belt and the shoulder belt owing to free sliding of the slidable tongue piece to secure the safety of the human body.
The slidable tongue piece also gives improved contact feelin~ to the human body. As mentioned in the foregoing, the seat belt by the present Lnvention possesses various e~cellent effects exhibiting rich energy-absorbing performance and meets the demand required by modern vehicles.
While there have been described and illustrated preferred embodiments of the present invention it is apparent that numerous alterations, insertions and additions may be made without departing from the spirit thereof.
The present invention is concerned with a novel seat belt assembly for use in vehicles, having rich energy absorbing property and by which the retracting amount by the retractor is increased, thereby promoting use of the retractor.
The seat belts have generally been employed to mitigate mechanical shocks to the passengers of vehicles such as automobiles and air craft resulting to provide safety performance. The seat belts of this sort were so far studied from various aspects and angles, and many proposals were so far presented.
In the early days, the belts were manufactured in two-point type to hold only the waist, but to attain more reliable safety ~059959 performance, the belts were made in three-point type having an additional belt to hold the shoulder. In recent days there has been proposed the belts of the type in which the waist belt and the shoulder belt are made in a continuous form. The belt system of the aforesaid continuous type has an advantage that they need just only less retractor units than retractor units required by the aforesaid three-point type belt system. The modern trend, however, has been placing increasing demand for the belts to provide moxe energy absorption, which has resulted in the use of shoulder belts having large absorption of energy. However, the belts of the aforesaid continuous type have to be made by joining together an ordinary belt and a belt having high energy absorption. Hence the joined place gives an uncomfortable touch feeling to the human body, and comes into contact with the guide members of the retractor when the belt is ~ being taken up along smooth retracting movement. It is~ thexefore, desired to make the belt with a single woven fabric without seams to improve the aforementioned defects. At present, however, to make such a belt is technically difficult and no satisfactory solution has been found.
In recent years, increased concern with regard to the improve-ment of retractors has resulted in the manufacture of retractors of various types. Such retractors, however, have all been design based on a prerequisite that the thickness of the belt is equal along the lengthwise direction, thereby imposing a limit to the amount of taking up the belt. To increase the take-up amount, the retractor must have increased volume~ losing economy in spac~ particularly when it is used for the vehicles having narrow room. This is a fatal defect of the belt of the aforementioned continuous webbing type, losing the balance of whole parts of the vehicle. From such view-g point, it is an important assignment to increase the take-up space just with using a retractor of an ordinary size.
SUMMARY OF THE INVENTION
The inventor of the present invention has conducted extensive study in an effort to solve the aforementioned defects by giving attention to the aforesaid various points, and has found an effective means by which the belts can be formed continuously as a single unit based on the characters required for the shoulder belt and the waist belt, It is known, in general, that the shoulder belt requLres less tensile strength than the waist belt. For example, the waist belt requires a tensile strength of more than 2700 kg, whereas the shoulder belt requires only tensile strength of up to 1800 kg.
Particularly, it was confirmed by experiments conducted by the U.S.National Highway Transport Safety Agency (NHTSA) that where a belt having property to absorb energy is used for the shoulder belt, the tensile strength needs not necessarily be 1800 kg, but may be sufficient if the belt has a tensile strength of 500 kg. It is, therefore, recognized that the shoulder belt may have less thickness than that of the waist belt and may have less strength to sufficiently attain the desired object.
10S995~
The seat belt of the present invention was designed under the above said situations and comprises a seamless and continuous webbing having a belt to hold the waist and a belt to hold the shoulder, characterized in that ~he belt portion of holding the shoulder of said webbing is thinner and has less strength than the waist portion of the belt, and further has an extension property that does not restore to the initial state under a certain load condition that substantially causes the belt to extend by a certain length.
The present invention provides a combined vehicle safety belt shoulder and waist section structure in which the shoulder and waist sections are woven of warps and wefts and possess different strength and elongation properties. The shoulder section is thinner than the waist section, and the shoulder and waist sections possess a plurality of common continuous warps some of these continuous warps having high energy-absorbing pro-perties and possessing a greater weave crimp in the waist section than in the shoulder section and the waist section possessing a greater number of warps than the shoulder section.
There is also provided a method of producing this combined safety belt comprising weaving a continuous band inclu-- ding successive alternate shoulder and waist sections in which a plurality of warps interwoven in the waist section float in the shoulder section, severing the floating warps and severing the band at alternate junctions of the waist and shoulder sections.
In a further embodiment, the present invention provides a seat belt for vehicles comprising a seamless and continuous webbing, wherein a belt which holds the waist and a belt which holds the shoulder is formed of a seamless and continuous webbing, characterized in that the shoulder portion (1) of the webbing is thinner in thickness than the waist portion (2) of the same webbing and has an extension property that does not restore to the initial f` ~ -4-~059959 state under a certain load condition that substantially causes the belt to extend a certain length, and the waist portion (2) of the webbing has a greater number of warps than the shoulder portion whereby the waist portion has larger strength than the shoulder portion (1~.
The invention is illustrated below with reference to a concrete embodiment shown in the accompanying drawingsO But it should be noted that the present invention is not restricted to the below mentioned embodiment only but permits various design modifications without departing from the objects of the present inventionO
BRIEF DESCRIPTION OF THE DRAWINGS
Figo 1 is a perspective view showing an example of using the seat belt of the present invention.
Figo 2 is a partially omitted perspective view showing the appearance of the seat belt of the present invention.
Figo 3 is a diagram showing an example of the texture of the waist belt of the seat belt of the present inventionO
Figo 4 is a diagram to show an example of the texture of a selvage of the seat belt of the present invention.
Fig. 5 is a vertical cross-sectional view showing the texture of Fig, 3 of the waist belt of the seat belt of the pre-sent inventionO
'. J
Fig. 6 is a diagram showing an example of the texture of the shoulder belt o~ the seat belt of the present invention.
Fig. 7 is a vertical cross-sectional view showing the texture of Fig. 6 of the same seat belt.
Fig. 8 is a vertical cross-sectional view showing the texture at the boundary part of the waist belt and the shoulder belt of the seat belt of the present invention, and Fig. 9 is a diagram showing curves of load and extension of the waist belt and the shoulder belt of the seat belt of the present invention.
DESCRIPTION OF THE PREFERRED E~ODIMENTS
Fig. 1 shows a diagram to illustrate an example in which a seat belt of the present invention is employed, in which the reference numeral 1 stands for a shoulder belt~ and the re~erence numeral 2 represents a waist belt. These two belts 1 and 2 form a belt made of a single continuous webbing via a boundary part 3 as shown in Fig. 2. The shoulder belt 1 is thinner than the waist belt 2. The belt composed of these shoulder belt l and waist belt 2 will usually have a retractor 4 and a fastening fitting 5. The belt is passed through a slidable tongue piece 6 locating as a middle suspending matter; the slidable tongue piece 6 will be en-gaged with a buckle 7 which is suspended to an anchorage hole 8 selected within the vehicle inside. The reference numeral 9 is a member to guide and direct the shoulder belt position 1 that was pulled out from the retractor 4 fixed on some place of the :1059959 side wall. The member 9 is not necessary if the retractor is provided here at this position. Also, the reference numer~llO
represents a seat in the vehicle.
Figs. 3 to 5 are diagrams to show an example of weaving waist belt 2, Fig. 6 and 7 are diagrams to show an example of a woven texture of the shoulder belt 1, and Fig. 8 shows an embodiment of a texture at the boundary part 3 between portion belt 1 and 2. In the drawings~ the reference numerals 11, 12, 13, 14, 15 and 16 are warps in a complete texture. The above warps are arrayed in many number in parallel, and to both sides thereof are added warps 21, 22, 23 and 24 having selvage shown in Fig. 4 to determine the belt width of the present invention. The reference numerals 31 and 32 are warps having smaller elongation than the warps 11 to 16. Further, the reference numerals 41, 42, 43, 44, 45 and 46 are wefts in the waist belt 2, and the reference numerals 51, 52, 53, S4, 55, 56, 57 and 5~ are weftsin the shoulder belt 1.
In Figs.3 to 5, the aforesaid warps 11 to 16 and 31, 32 are crossed and interlinked by the wefts 41 to 46 by way of triple weaving shown in Fig. 3 to form the waist belt 2. In this case, the selvage texture shown in Fig. 4 is added to both sides of fabrics in Fig. 3O In Figs.6 and 7, the warps 11, 12, 14 and 15 among the warps 11 to 16 and 31, 32 in the aforesaid waist belt 2 are crossed and interlin~ed together with the wefts 51 to 58 and double weaving of wefts diagramatized in Fig. 6 and further the warps 13 and 16 are fioated, without being woven and arrayed in parallel, lOS9gS9 outside of the aforesaid crossed and bonded texture. The warps 31, 32 are crossed and interlinked with the wefts in the afore-said waist belt 2, and are running as core yarns being retained inside of the texture composed of warps 11, 12, 14, 15 and S wefts 51 to 58, as seen in Fig, 7; the warps 31, 32 are not exposed outside of the texture. As mentioned above, the fabric of the shoulder belt l of the present invention is formed by the interrelated fu~ tion among the warps 11, 16, 31, 32 and wefts 51 to 58.
The aforesaid selvage texture diagramatized in Fig.4 is also added to both sides of the shoulder belt 1. Here the aforesaid waist belt 2 and the shoulder belt 1 are constituted as a single continuous webbing without seam. In this texture, the boundary part 3 between the two belts l and 2 is shown in Fig. 8. That is, the warps 11, 12, 14, 15, 31 and 32 forming the waist belt 2 are taken over by the fabric of the shoulder belt 1. The floating warps 13 and 16 are cut away at a part A where they appear out of the fabric. The cut-away part is then removed appropriately, and the position A at the end is then dyed and transferred to the position B of Fig. 8, and then buried and retained in the texture of the waist belt 2. In this wayt a continuous seamless webbing isformed with the waist belt 2 and the shoulder belt 1 together. In the foregoing description9 the warps are preferably cut away in an amount within the range of 10 to 40~/O in relation to the thickness and strength of the belt, so that the thickness is reduced into appropriately favorable value relative to the thickness of the waist belt 2.
Although the foregoing description has dealt with the transfer from the waist belt 2 toward the shoulder belt 1, it should be noted that the webbing of the present invention is made for manufacturing a long ~xture in which the waist belt 2 and the shoulder belt 1 are repeated alternately; the same structure is rep eated from the shoulder belt 1 toward the waist belt 2.
However, here, as for the order of wefts, the weft 41 in place of we ft 46 in the waist belt 2 is woven next of the weft 58 of the shoulder belt 1. Materials of wefts and warps for use in the webbing texture of the present invention may be thermoplastic synthetic fibers such as nylon, vinylon, polyester, polyprene esters, and various fibers such as viscose rayon, cott on,-hemp,etc.
Among the above thermoplastic synthetic fibers, particularly preferred examples are nylon and polyester fibers. These fibers may often be employed by being mixed t ogether. The warps 31 and 32 that serve as core yarns may be made of a polyester fiber, vinylon, metallic fiber and glass fiber. Particularly preferred example may be a reformed fiber that is known as fiber B having less elongation. The core yarns, however, are selected best by comparison with the warps constituting the fabric.
The webbing by which the waist belt 2 and the shoulder belt 1 are connecte~ for a single unit, is terminated to the aforesaid retractor 4 and to the fastening fitting 5, and is used for a seat 1~59959 belt as shown in Fig. l. Also, in this case, the mounting positions of the retractor 4, fastening fitting 5, buckle 7 and indoor member 9 cannot be limited to the positions shown in Fig. l but may be mounted at any appropriate positions. In the present invention, in particular, the shoulder belt l is thin and is allowable to be mounted directly on the seat lO, - which possibility is an advantage of the belt of the present invention.
When mechanical impact is applied to the aforementioned seat belt, the waist belt 2 havir.g large strength and thickness securely holds the human body, and the shoulder belt l which is made thin and has smaller strength undergoes stretch easily when the impact is applied, whereby the core yarns are broken step by step in order, and then the determined load is reached and further acting point exten~ to a set point P shown in Fig. 9 to absorb the energy exerted on the human body. Fig. 9 shows this state, wherein the load and extending elongation degree exerted on the waist belt 2 as measured under the Standard, isdiagramatized in . .
diagram (a). The diagram (a) shows less degree of elongation and less work done. However, if the elongation of the shoulder l is set at 30%, for example, under a determined load of 300 kg, -the core yarns will be broken down step by step at around 300 kg loadèd, so that the flat portion such as in the diagram (b) may continue from an extension degree about 4 to 8% started to a set point P of about 30% indicated there. Furtherl if the loading is increased lOS9959 up to 1130 kg speci~ied value under the Spec. MVSS, the extension reaches about 45%, at which the belt does not restore to the initial state (length) even after the load o~ 1130 kg is removed;
the amount of work done is very large as compared to that of the waist belt 2. From the abovementioned fact, even a single continuous seamless webbing has the performance being comparable to a conventional three-point type seat belt employing energy-absorbing belt ~or a shoulder belt. The fact proves that the seat belt by the present invention has excellent performance.
Here the aforementioned predetermined load and set point will be selected depending upon the waist belt 2 and the shoulder belt 1 of the belt over the range of 150 to 1000 kg and from 20~/. to 40% of the point P.
As mentioned above, the seat belt of the present invention is made of a continuous and seamless webbing including the waist portion 2 and the shoulder portion 1, contributing to reduce the number of retractorsthat will have to be installed in the vehicle room.
Moreover, since the webbing of shoulder portion 1 can be made thin and can be taken up by the retractor, it is allowed to make the retractor in small size or to have both the shoulder portion 1 and the waist portion 2 contained in a conventional retractor case.
Therefore, in addition to reducing the number of retractors to be used, reasonable use of the retractor can be promoted and the seat belts can be attached to the vehicle room properly. In addition, the seat belt by the present invention, which is made of a single seamless and continuous belt, exhibits excellent performance to absorb energy which is comparabl to conventional three-point type energy-absorbing belts. Besides, the belt by the present ~ in~vention without seams permits the slidable tongue piece to slide smoothly, so that said slidable tongue piece can be retained at any proper and balanced positions to fasten the belts.
In case of collision, the impact due to the collision is dispersed between the waist belt and the shoulder belt owing to free sliding of the slidable tongue piece to secure the safety of the human body.
The slidable tongue piece also gives improved contact feelin~ to the human body. As mentioned in the foregoing, the seat belt by the present Lnvention possesses various e~cellent effects exhibiting rich energy-absorbing performance and meets the demand required by modern vehicles.
While there have been described and illustrated preferred embodiments of the present invention it is apparent that numerous alterations, insertions and additions may be made without departing from the spirit thereof.
Claims (8)
1. A combined vehicle safety belt shoulder and waist section structure in which said shoulder and waist sections are woven of warps and wefts and possess different strength and elon-gation properties characterized in that said shoulder section is thinner than said waist section, and said shoulder and waist sec-tions possess a plurality of common continuous warps some of said continuous warps having high energy-absorbing properties and pos-sessing a greater weave crimp in said waist section than in said shoulder section and said waist section possessing a greater num-ber of warps than said shoulder section.
2. The structure of claim 1 wherein at least some of the said warps in said waist section interwoven with wefts therein extend through said shoulder section as core yarns unwoven with wefts in said shoulder section.
3. The structure of claim 2 wherein said core yarns possess high elongation and high energy-absorbing properties.
4. The structure of claim 1 wherein all the warps in said waist section are interwoven with the wefts therein.
5. The structure of claim 1 wherein some of said warps in said waist section extend through said shoulder section in an unwoven state as core yarns.
6. The structure of claim 1 wherein said waist section includes interwoven layers of greater number than those in said shoulder section.
7. The method of producing the structure of claim 1 comprising weaving a continuous band including seccessive alter-nate shoulder and waist sections in which a plurality of warps interwoven in said waist section float in said shoulder section, severing said floating warps and severing said band at alternate junctions of said waist and shoulder sections.
8. A seat belt for vehicles comprising a seamless and continuous webbing, wherein a belt which holds the waist and belt which holds the shoulder is formed of a seamless and conti-nuous webbing, characterized in that the shoulder portion (1) of said webbing is thinner in thickness than the waist portion (2) of the same webbing and has an extension property that does not restore to the initial state under a certain load condition that substantially causes the belt to extend a certain length, and the waist portion (2) of the webbing has a greater number of warps than the shoulder portion whereby the waist portion has larger strehgth than the shoulder portion (1).
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP50091606A JPS5216736A (en) | 1975-07-29 | 1975-07-29 | Safety seat belt for car |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1059959A true CA1059959A (en) | 1979-08-07 |
Family
ID=14031215
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA257,827A Expired CA1059959A (en) | 1975-07-29 | 1976-07-27 | Seat belt webbing construction |
Country Status (8)
| Country | Link |
|---|---|
| JP (1) | JPS5216736A (en) |
| AU (1) | AU506481B2 (en) |
| CA (1) | CA1059959A (en) |
| DE (1) | DE2633886A1 (en) |
| FR (1) | FR2319388A1 (en) |
| GB (1) | GB1548574A (en) |
| NL (1) | NL7608369A (en) |
| SE (1) | SE429103B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS558908A (en) * | 1978-06-29 | 1980-01-22 | Takata Kk | Butting device for absorbing impact energy |
| GB2174728A (en) * | 1985-05-09 | 1986-11-12 | Frank Burton Davis | Animal blanket and material |
| US6378465B1 (en) | 1999-10-15 | 2002-04-30 | Protecta International, Inc. | Full-body safety harness |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2325215A (en) * | 1941-12-11 | 1943-07-27 | Louis J A Amyot | Fabric |
| US2558336A (en) * | 1949-06-11 | 1951-06-26 | Dominion Corset Co Ltd | Elastic webbing |
| GB1124995A (en) * | 1965-10-22 | 1968-08-21 | Industrifjaedrar Ab | Improvements in or relating to safety seat belts |
| US3464459A (en) * | 1968-01-17 | 1969-09-02 | Burlington Industries Inc | Webbings for safety restraint systems |
| GB1388484A (en) * | 1972-03-17 | 1975-03-26 | Toyota Jidosha Kogyo Kk Tokai | Webbing and belting for use in seat belts |
| JPS4931027A (en) * | 1972-07-22 | 1974-03-20 |
-
1975
- 1975-07-29 JP JP50091606A patent/JPS5216736A/en active Granted
-
1976
- 1976-07-27 CA CA257,827A patent/CA1059959A/en not_active Expired
- 1976-07-28 SE SE7608540A patent/SE429103B/en unknown
- 1976-07-28 DE DE19762633886 patent/DE2633886A1/en not_active Ceased
- 1976-07-28 AU AU16350/76A patent/AU506481B2/en not_active Expired
- 1976-07-28 NL NL7608369A patent/NL7608369A/en not_active Application Discontinuation
- 1976-07-29 FR FR7623280A patent/FR2319388A1/en active Granted
- 1976-07-29 GB GB31555/76A patent/GB1548574A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5216736A (en) | 1977-02-08 |
| AU1635076A (en) | 1978-03-02 |
| GB1548574A (en) | 1979-07-18 |
| SE429103B (en) | 1983-08-15 |
| NL7608369A (en) | 1977-02-01 |
| JPS564272B2 (en) | 1981-01-29 |
| SE7608540L (en) | 1977-01-30 |
| FR2319388B1 (en) | 1981-10-23 |
| FR2319388A1 (en) | 1977-02-25 |
| AU506481B2 (en) | 1980-01-03 |
| DE2633886A1 (en) | 1977-02-17 |
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