Static structures (e.g. – buildings) – Machine or implement
Patent
1983-09-21
1986-07-15
Perham, Alfred C.
Static structures (e.g., buildings)
Machine or implement
49501, 52731, E04C 332, E04C 304, E06B 300
Patent
active
045998434
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a bar, in particular a safety bar for use in vehicles in case of collisions and similar situations. The bar is in the first place intended to be installed in doors for cars, in particular automobiles, in order to absorb forces, e.g., in case of lateral collision between cars and other vehicles.
2. The Prior Art
Hitherto known safety bars in car doors are of tubular design and of circular cross-section. Since in general it is very important to be able to keep down vehicle weights, one tends to design all load-bearing details in cars in such a way as to achieve an optimal relationship between the weight and load-bearing capacity of the component. However, if a collision with a car occurs, it is not only the load-bearing capacity of the component in its initial shape which is of interest but also its load-bearing capacity in the deformed state. The hitherto known circular safety bars have been shown not to offer an optimal ratio between weight and load-bearing capacity. It has also been shown that they gradually lose their load-bearing capacity in step with the deformation of their cross-section, in as much as during this process an indentation is brought about on the load-bearing side of the bar. With an indentation in this side, the bar's capacity to absorb compressive forces in its longitudinal direction is reduced, as a result of which the bar collapses.
SUMMARY OF THE INVENTION
The object of the present invention consists in creating a bar free from the disadvantages characterizing the safety bars hitherto known. This object has been achieved by means of a bar of thin-walled, closed and trapezoidal cross-section, comprising two parallel flanges and two webs inclined in relation thereto. The invention is characterized in that at least one of the flanges is designed with projecting corners which extend along the bar and project from the plane through the flange and away from the bar.
It is certainly generally known how to design, e.g., load-bearing roof plates of so-called trapezoidal section, where the plate ridges are trapezoidal. By comparison with bars in accordance with the invnetion, a bar consisting of a single ridge is, however, open along the wide one of the two parallel sides of the trapeze. If such a bar is loaded at a right angle in respect of its narrow flange, lateral forces occur which form the two inclined webs of the bar. With a bar in accordance with the present invention, the lateral forces are, in the corresponding loading case, balanced, thus bringing about a more advantageous weight/load ratio. The open bar is, in addition, considerably less torsionally rigid than the closed bar.
However, a bar of trapezoidal cross-section has the same disadvantages as, e.g., a bar of circular cross-section, since it buckles on the side on which it is loaded. The load-bearing capacity of the trapezoidal bar is greatest on the side with the narrow flange, but this capacity almost ceases if the narrow flange is buckled inwardly and is accordingly no longer capable of absorbing compressive stresses. A safety bar in, e.g., a car is highly likely to buckle in case of a collision, as a result of which its load-bearing capacity largely ceases. With the present invention, however, at least the narrow flange is therefore designed with projecting corners which extend along the bar and project from the plane through the flange and away from the bar. Owing to these projecting corners the bar is protected against buckling, e.g., in case of a violent collision, in as much as the corners absorb most of the energy which would have buckled the flange of a bar without projecting corners. Thus the corners act as a deformation zone, protecting the flanges of the bar in the same way as, e.g., the front of the car constitutes a deformation zone protecting its passenger compartment. Another advantage of providing the narrow flange with projecting corners consists in that it is possible to ensure thereby that the same amount of materia
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Dobel AB
Perham Alfred C.
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