SE453585B - CUSHION FOR VEHICLE SEATS, SPECIAL FOR PERSONS WITH LESS BODY WEIGHT, LIKE CHILDREN - Google Patents

Description

'15 20 25 30 35 453 585 2 The well-known seat belt cushion has proven to be good for children, as it not only provides greater safety for people with smaller body sizes, especially children between three and twelve years, but the upper front edge of the cushion, which lies on the vehicle seat, is closer to the backrest and thus adapts to the shorter thighs of children and the like. With suitable materials, the belt manufacturers can in this way be given a new opportunity to offer safety equipment in different sizes, even in cases where the people sitting in the back seat have not been restrained. The seat belt cushion achieves a better transfer of the kinetic energy, which can be derived by, for example, friction and by the pressing pressure in the cushion. Due to the larger surface area, the seat is exposed to a smaller local pressure load and safety is increased.

The cushion can be applied to the seat in many different ways, for example by riveting on a support frame arranged on the vehicle seat or by clamping a stable cover with the aid of the belt strap. It is also possible to mount the cushion on the seat by means of a cover upholstery or the like. in any case extends to clamped persons of smaller body size, who do not sit directly in the seat but on the attached cushion, the hip strap from the lower, laterally behind the seat existing attachment point obliquely upwards and forwards and past the joint between seat and backrest to lie around the person's hip.

In order to further increase the safety of the person sitting on the cushion, it has in some cases already been proposed to provide the cushion with handlebars on the sides at the rear right and left, through which the seat belt straps are passed: In the area of the handlebar, from the side a jerk in the hip ligament _ pulling. With the handlebars, a steep hip strap guide should be achieved at the person's hip ridges. In the event of an accident, you can then hold down the hip strap and prevent the dangerous undercutting described above. However, the lateral guide brackets on the cushion are rigid and practically impossible to deform, since they are made of hard steel for reasons of strength.

The object underlying the invention is to provide a seat belt cushion of the type stated in the introduction with which the user's safety can also be increased by ensuring a power limitation, so that the user enjoys even greater protection in the event of an accident.

This object is solved according to the invention in that each guide bracket projects from the respective side surface of the cushion, is flexurally soft and on the surface parallel to the seat surface can be bent upwards a defined deformation path. The side brackets for guiding the hip strap together with the cushion practically form a flexible joint, so that the desired deformation path when bending the handlebar straps in the event of an accident is technically easy for the manufacturer to control and thus faultlessly defined.

Due to the bending and deformation of the guide stirrups arranged on the sides, a type of spring force is exerted in the event of a spring-soft spring transverse to the longitudinal direction of the belt belt, so that a desired force-limiting effect occurs. As is well known, strapped persons are thrown forward in the event of an accident, as a result of which the hip strap is exposed to load. If one looks at the belt pulling from the side and in normal use the jerk described above, this starts due to the load acting in the belt and the flexural flexibility of the deformable guide constructions - this way the desired force limiting effect is obtained. to straighten out. According to the invention, it is particularly advantageous if the guide brackets are connected to each other with a plate of sheet metal or plastic extending through the cushion and if the deformation path is in the centimeter range, preferably in the range approx. 25-45 mm. The guide stirrups arranged externally on the sides are in this way connected to each other with a more or less rigid, wood-like part extending through the cushion, the material properties of which allow a defined deformation path at maximum loading of the belt.

In this case, it is especially suitable if the plastic is an ABS, PA, PC or PP plastic and the guide brackets are elastically deformable. The force limitation described above can of course also be achieved by a plastic deformation of the guide stirrups. However, elastic deformability is preferred, which in practice has proved particularly suitable when using plastic. The above-mentioned abbreviations ABS, PA, PC and PP are abbreviations of the plastic families copolymers of acrylonitrile and styrene butadiene, polyamide, polycarbonate and polypropylene. If you prefer a plastic, ie permanent deformability, you can use a metal plate for the plate instead of a plastic.

Due to the deformation of the handlebars in the event of an accident, the desired force limiting effect also arises in the area of the diagonal band. This is highly desirable for children and adults, as the normal seat belt is designed for larger and heavier people. The impact of the hip belt on the diagonal belt takes place via the belt belt penetration on the locking tongue, when the seat belt is loaded to the maximum in the event of an accident and the defined deformation path is passed. The explanation lies in the fact that the belt strap is usually not attached to the locking tongue, but there is a fluid transition between the hip and diagonal straps. When the hip strap is extended by the suspension of the guide straps, a piece of strap can move from the area of the hip strap and via the locking tongue acting as a sliding fitting to the area of the diagonal strap. This extension of the diagonal band provides a force-limiting effect.

In this case, it is particularly suitable for the diagonal band to be extended with exactly the force that the guide brackets at the bottom of the cushion allow in the hip band.

In a further preferred embodiment of the invention, the guide stirrups are hook-shaped and, like the guide stirrups connecting the plate, extend substantially in the surface parallel to the seating surface. Preferably, the cushion is built up in several layers or layers, which are arranged approximately in the surface parallel to the seating surface. the handlebars are located in this surface. If one normally starts from a horizontal surface in order to have a simpler viewing model, these guide stirrups can also be considered to extend horizontally, whereby in the event of an accident they can be bent upwards from this surface a defined distance. Due to the hook-shaped design of the guide stirrups, an aesthetically pleasing appearance is obtained for increased safety, since the hooks are suitably arranged so that their free ends end in the direction of the side surfaces of the cushion. the opening for the passage of the belt strap is thus located between the hook of the respective guide bar and the adjacent side surface of the cushion.

According to the invention, it is further arranged that a plate is formed as a layer of the cushion built up of layers and foam plastic and extends substantially over the entire seating surface and that the guide brackets are formed in one piece on the plate. A practical manufacturing method is punching the guide stirrups from the plate material.

Due to the large surface of the plate and because the guide brackets are formed in one piece with this plate, a good bending stiffness is obtained in the cushion in the transverse direction, ie in the direction transverse to the seating surface. In use, the user sits _ in the middle of the plate and presses down the plate with his seat-knuckles. This has a beneficial effect on the stabilization of the handlebar brackets, which can bend upwards next to and past the user's buttocks. In the event of elastic deformation, the stirrups return to their original position after the load, so that the cushion regains its original shape.

The invention is described in more detail below with reference to the accompanying drawings, which show preferred embodiments. Fig. 1 shows diagrammatically from the side 'a rear seat intended for a motor vehicle with a seat belt cushion mounted thereon and a person sitting thereon. Pig 2 shows the cushion schematically from the front with a direct gaze towards the handlebars, whereby the front parts, presented in front of the viewer, have been omitted for the sake of clarity. Fig. 3 10 15 20 25 30 35 453 585 6 shows in perspective a plate with guide brackets formed thereon. Fig. 4 schematically shows the right half of the plate according to Fig. 3. Fig. 5 shows the seat belt cushion in perspective with its hook-shaped guide barrel located on the rear sides Fig. 6 shows a part of the cushion according to Fig. 5 from the front from the left front corner towards the right rear.

Fig. 7 shows the right half of the pillow according to Fig. 5.

In Fig. 1, a person, for example an eight-year-old child, is sitting on a seat belt cushion 1, the handlebars 2 designed on the sides of which are screwed on for clarity. The cushion 1 is arranged on the seat surface 3 of the vehicle seat 4 and the child leans against the backrest 5.

A belt strap 7 is passed through the guide brackets 2 and thus prevents the cushion 1 and the child from moving forward.

The strap 7 comes from an attachment point 8 located at the rear and at the bottom of the vehicle floor and extends at a relatively flat angle of, for example, 200 to the horizontal plane through the space between the seat 4 and the backrest 5 obliquely forwards and upwards. there is, so to speak, a jerk in the strap seen from the side in Fig. 1, since the hip strap extends significantly steeper upwards from the guide brackets 2, for example at an angle of 600, to the child's hip ridges.

In the event of an accident, the child is thrown forward, so that the hip strap is exposed to a load. The traction force 1 of the hip strap 7 then tries to displace the jerks upwards to the left in the area of the guide bracket in such a way that the strap tension is straightened.

This straightening is counteracted by the fixing of the handlebar brackets.

The guide brackets 2 are flexurally soft and defined in a deformable manner in the manner described above.

Fig. 2 shows through the schematic representation of the cushion 1 laterally externally the guide brackets 2, which are connected to each other with a plate 9 extending through the cushion 1, which is indicated by two parallel, dashed lines. In the event of an accident, the guide stirrups 2 bend upwards along the dotted line, the plastic plate 9 deflecting slightly in a manner not shown when the guide stirrups 2 'made in one piece with the plate bend upwards.

The plate made of plastic, for example, is shown in perspective and horizontal projection in Figures 3 and 4, respectively.

In this preferred embodiment, the guide brackets 2 belong to the plate 9 themselves. They are hook-like designed as part of the plate and, by special manufacture, punched out of a larger plate.

Pig S shows the pillow in perspective. Of course, you can no longer see the plate, as it is located under a layer of foam plastic, over which an attractive cover is also drawn. The pillow according to Fig. 5 can be manufactured in different ways. Preferably, the pillow consists of a number of different layers, one of which is the plate. It is, so to speak, layered in the overall structure and fastened by gluing, so that the laterally located guide brackets 2 in the form of ears form a flexible connection with the middle part of the cushion 1. In the event of an accident, this allows a defined deflection of the guide stirrups 2 when depressing the seating surface in the middle of the plate 9, the deformation path a in Fig. 2 suitably being in the range 25-45 mm. In this way the desired force-limiting effect is obtained, namely by the suspension of the ear-shaped guide brackets 2. 7 In Fig. 6 some details are seen in the preferred embodiment of the cushion 1, the left half of which is shown.

The leading edge 10 located below the user's knee crease is clearly higher than the trailing edge 11, which only due to the shape of the cushion can be shown as a clear geometric line. The lateral guide stirrups 2 lie deeper and extend in the form of a hook, the free end of which is directed forwards and inwards towards the adjacent side surface 12. Fig. 1 finally shows diagrammatically the right half of the cushion 1 from above. The right hook-shaped guide bracket 2 is recognized, the downwardly facing free end 13 of which faces the side surface 12 and thus defines an opening 14 through which the belt 7 shown in Fig. 1 is passed.

Claims (4)

10 15 20 25 30 455 585 PATENT REQUIREMENTS ° Cushion for vehicle seat, especially for persons of smaller body size, such as children, for mounting on the seat surface (3) of the vehicle seat (4), in which cushion from the person seen it at the rear end are on the right and left side projecting guide brackets (2 , 2 '), extending through the cushion (1) and extending which are connected to each other by means of a surface substantially parallel to said seat surface and through which a seat belt strap is movable, characterized in that the part (9) 9) connecting the guide brackets (2, 2 ') to each other is a plate which also extends substantially in the surface parallel to the seat surface and consists of sheet metal or plastic, and that the guide brackets, made in one piece with the plate, are flexible and bendable upwards a defined deformation path (a) from the surface parallel to the seat surface. 2. -2. Cushion according to claim 1, characterized in that the deformation path (a) is in the centimeter range, preferably in the range about 25-45 mm. Pillow according to claim 1 or 2, characterized in that the plastic is an ABS, PA, PC or PP plastic and that the guide bracket (2) is elastic or plastically deformable. k ä n - Cushion according to one of the preceding claims, characterized in that the guide brackets (2) are hook-shaped. k ä nfa IS. Cushion according to any one of the preceding claims, characterized in that the plate (9) is designed as a layer of the cushion (1) made up of layers of foam plastic and extends substantially over the entire IN seating surface.