In a collision the 3point belt spreads out the energy of the moving body over the chest. In our study, the mortality rate was significantly. In this reference from georgia state physics dept the stretching seat belt reduces the deceleration from 30g to 20g compared to a non stretching belt. The idea of a pretensioner is to tighten up any slack in the belt webbing in the event of a crash. This system comprises of sensor, micro controller and locking mechanism in wheel and seat belt. If you have ever had a stuck seat belt retractor, this video will show you how to unlock the retractor to get the belt moving again. The seat belt force limiter is also designed to work with a. Extend and retract how seatbelts work howstuffworks. But in many states, fines for violating seat belt laws are so small that they dont motivate people to wear their seat belt.
The mass is supported by a stalk having a part spherical upper end 15 carried in a vertical tubular guide 14. Cat seat belt reminder system throughout your fleet. Most people who are going to get on a plane have been in a car they probably rode in one to the airport, so familiarity with automotivestyle seatbelts can generally be assumed. A threepoint seat belt is a y shaped belt that is the combination of a lap belt and a sash belt. Because previous work showed that the dring location had minimal effect on lap belt fit across a range of lap belt angles, the effects of dring location and lap belt angle were examined separately, each at 3 levels. The most important part of a seat belt is the spools locking mechanisma device that makes the belt hold tight in the unfortunate event of a crash. In this system vehicle propels only when seat belt. But in a collision, the belt will suddenly tighten up and hold you in place. The biomechanics and pathogenesis of seat belt syndrome. Us7036878b2 vehicle seat with integral seat belt mechanism. The seat belt contains a pretensioner inside the retractor that activates only once when the car has been in accident or has come to an abrupt stop. Still, only 33 states, including california, have standard seat belt laws. A moderate amount of stretch in a seatbelt harness can extend the stopping distance and reduce the average impact force on the driver compared to a nonstretching harness.
This technology may be used as an alternative to other expensive technologies like air bag. Seat belt useoverall results, january 2020 pdf, 610 kb seat belt usestates and territories, june 2019 pdf,3. So, in this project we have proposed better seat belt system than the present ones. Seat belt height adjustment etd in installation position if the seat belt is also equipped with a seat belt force limiter, the limiter, when activated, helps to reduce the peak force exerted by the seat belt on the occupant. Short video i took while repairing stuck seatbelt to show how this mechanism works. A seat belt that fails to lock, wont move or wont adjust is an indication of a failed mechanism.
A sensing unit mounted above the housing includes a circular pendular mass 17. Seat belt pretensioner retracts the seat belt immediately to restrain the body of front seat passengers in an event of a frontal collision. Engaging a seat belt also requires little care or thought, partly because the devices precision requirements are achieved automatically when it is used. The usage rate for drivers and other occupants in the west, midwest, and south were 87% compared to the northeast at 71%. Each belt is good at something different, and each belt has its own set of drawbacks. How effective are seat belts and seat belt regulations. Consider adding a top of cab beacon for each machine a beacon is an addon option for the cat seat belt reminder system. Your integra has seat belts in all five seating positions. Motor vehicle crashes are a leading cause of death among those aged 154 in the u. The use of seat belt has obviously reduced the mortality rate from road traffic collisions all over the world 1, 21.
Whereas the conventional locking mechanism in a retractor keeps the belt from extending any farther, the pretensioner actually pulls in on the belt. The seat belt mechanism b has a seat belt c, a retractor d disposed in a vehicle door pillar, a tip anchor e engaged with a tip end of the seat belt c, a tongue plate f attached at the midpoint of the seat belt c and a tongue anchor g with which the tongue plate f is detachably engaged. The relative risk taken by an occupant without a seatbelt is 70% higher than that of a belted occupant. The front seats have automatic shoulder belts with separate lap belts. Seat belt pretensioner automotive systems laboratory, inc.
Wellenforced seat belt laws work because most people would rather buckle up than possibly pay a fine. This extra controlled travel in the seat belt gives the human body a few more milliseconds to decelerate ie a little more slowly, so that the impact of the actual belts against the body does much less damage. Buckling up helps keep you safe and secure inside your vehicle, whereas not buckling up can result in being totally ejected from the vehicle in a crash, which is almost always deadly. The inadequate seat pan antisubmarining feature in association with lack of seatbelt loadlimiter and pretensioner reduces the level of occupant protection offered by the seat belt system in the. Aug 10, 2015 if you have ever had a stuck seat belt retractor, this video will show you how to unlock the retractor to get the belt moving again. The seat belt pretensioner of claim 1 wherein said pinion gear is of varying diameter so as to vary the rate of rotation thereof in relation to advancement of said piston 9 and rack. A seat belt for a vehicle passes over a roller 1 rotatably mounted within a housing which swivels on vehicle structure such as a door post. Car seatbelts have the ability to extend and retract you can lean forward easily while the belt stays fairly taut.
The central element in the retractor is a spool, which is attached to one end of the webbing. In order to understand the function of the release button, and how it contributes to the various system failures, it is necessary to first understand how the seat belt receptacle mechanism works. A shoulder or sash belt goes diagonally over the occupants chest and shoulder. In a typical seatbelt system, the belt webbing is connected to a retractor mechanism. The range of fatality reduction for front seat passengers was broad, from 20% to 55%, as was the range of major injury, from 25% to 60%. Manufacturers build modern cars with seat belt safety reminder alerts for the front occupants to put on their seat belt. The beacon activates whenever an operator is unbuckled during machine operationgiving site supervisors the ability to see which of their operators is not properly secured. Bransons joining process has been proven by a number of automotive manufacturers and is now the industry standard for assembling seat belt buckles. Failure of automobile seat belts caused by polymer. About seatbelts, seatbelt components, how to wear seatbelts. An analysis conducted in the united states in 1984 compared a variety of seat belt types alone and in combination with air bags.
It is very important that the user should inspect seat belts before each and every use. For adults and older children who are big enough for seat belts to fit properly, seat belt use is one of the most effective ways to save lives and reduce injuries in crashes. This works to rotate the spool so it winds up any loose webbing. In 2016 safety belt use in states governed by secondary belt use laws rose 7%. A typical takata seat belt receptacle of the affected design is shown in fig. These belts hold you tightly against the seat at all times, which is very safe but not particularly comfortable. It is the mechanism along with load limiters that allow the seat belt to progressively decelerate the vehicle passenger, rather than abruptly decelerate them which would cause greater bodily injury. Seat belt safety features using sensors to protect occupant. This repair was of course just a temporary solution.
During a crash, the seat belt keeps the body in the seat, allowing time for the body to come to a halt. Cmv driver and occupant safety belt usage stands at 84% for females and 86% for males, which is a slight increase from 20. A schematic of the seat belt latching mechanism is shown in fig. Inertia reel seat belts have almost entirely replaced the use of static seat belts whereby, by design, automatic belt adjustment occurs, further speeding up driver changeover. When the seat belt is unspooled and is across the persons body, the webbed fabric ends in a metal tab, called the tongue. The cost of car seat safety mechanism is very less as compared to other technologies. When using the seat belt, remember to keep the lap portion as low as possible see page 7. This force helps move the passenger into the optimum crash position in his or her seat. Either a stretching or nonstretching seat belt reduces the impact force compared to no seatbelt. Depending on the type of motor vehicle and its purpose, the vehicle may include any of several different seat belt types. For information about the seat belts in canadian models, see page 20. Front sub sensor detects the impact in an event of a frontal collision and outputs a deceleration signal to the control module.
Therefore seatbelts, properly installed and properly worn, offers the best protection for the automotive occupant during impact. The seat belt force limiter is also designed to work with a deploying front air bag by providing more. When the seat belt is unhooked, that same spiraling spring will automatically respool. This plan must be backed up by data, as described in module 2. Seat belts are still the single most effective injury prevention mechanism in a vehicle today. The seat belt system and how it works advice for pregnant women protecting the mother is the best way to protect her unborn child. Some of the most common types of seat belts include lap belts, sash belts, automatic seat belts, threepoint belts, beltinseat bis, fivepoint harnesses, and sixpoint. Important notice seat belt webbing is designed to stretch up to 20% of its total length to help absorb impact.
Further, that is why you should discard the seat belts every time they have been used in a large impact. Seat belts should always be used as a complete set lap belt, shoulder harness and crotch strap. How to fix seat belt buckle in the most convenient way. Inside the retractor, a spring applies a rotation force, or torque, to the spool. We also used the pubmed advanced search tool looking for the mechanism of seat belt syndromes results.
The automotive style pushbutton belt is very familiar to infrequent flyers. For this reason we ask you to understand, that at any given time, changes regarding shape, equipment and technique may take place on the car delivered. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. Mar 14, 1995 a retraction mechanism for the seat belt driven by said pinion gear. Therefore, a pregnant woman should wear a properlypositioned seat belt whenever she drives or rides in a car. The seat belt unspools from the spiraling spring that allows the vehicle occupant to pull the seat belt out.
461 1061 741 275 13 330 1183 1487 978 110 335 825 400 1015 1224 779 1296 395 152 352 1138 1470 1415 370 1342 1440 1122 224 210 473 1162 353 181 804 943 583 615 88 1158 227 1455 14 1459 817 1191 1158