| Title of Invention | "A TORSION BAR FOR APPLICATION IN BELT WINDERS FOR SAFETY BELTS" |
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| Abstract | A torsion bar for application in belt winders for safety belts, provided on end sections thereof with drive and/or locking elements for positive connection to respective devices, the torsion bar (1) including the drive and/or locking elements (2, 3) embodied at the ends thereof, is produced in one piece in a cold forming process and without machining from a non-ferrous metal which latter comprises a low temperature function. |
| Full Text | iocKing elements, fulfilling the requirements according to the low temperature function and additionally being produced without any metal cutting manufacturing. This is attained according to the invention in that the torsion bar including the drive and/or lodcing elements embodied at its end for achieving various torques at constant sizes of drive and/or locking elements and various diameter of the torsion har is produced in one piece in a cold forming processes from a non-ferrous metal using venous impact extrusions. By these measures according to the invention, die problems in pressing technology can be solved easily because the adjustment af the oiwnotcrs of drive and/or locking elements and torsion bars is possible using the different extrusion behaviors of various materials. Therefore, m adjustment baa been possible to the extent mat the final product can be produced without any metal cutting manufacturing. Further advantages result from essential weight savings being possible, perhaps. Furthermore, no protection from corrosion it required. Depending on the non-ferrous metal to be used, the tool life can be improved considerably in the cold forming process used for the production of torsion bars. With regard to the drive and/or locking elemeate, predetermined dimensions are given. The adjustment of the diameter of the torsion bar by means of pressing technology has been achieved by the use of non-ferrous metals. Here, it is not simply an exchange of material, but & number of inventive slept ware necessary, in order to achieve the possibility in cold forming processes allowing the diameter ratios to be adjusted to one another and in order to even find a material that can be cold formed in such dimensions, which additionally provides the required torques in the area of the torsion bar and also in the area of the drive and/or locking elements. Further, it is provided that at the drive and/or locking elements formed at the ends have cncterior dimension equal or larger man the torsion bar itself! By the material used accordng to the invention a very small difference in diameters is possible, too, so that the cold forming production can be used optimally. A particularly beneficial embodiment is provided when the torsion bar, produced in a cold forming process* is mode from aluminum. Aluminum has approximately the same extrusion behavior as unanncaled steel. However, a strength behavior under torsion can be achieved, here, wbich is possible in steel at very small diameters only. Then the extrusion behavior of steel is a hindrance for using a cold forming process. Namely, metal cutting manufacturing must be performed thereafter. This can be avoided entirely with aluminum because the differences in diameters between the torsion bar and the drive and/or looking elements can be kept small. The optimum plasticity for the production of a torsion bar is provided when pure aluminum is used up to 99,5 % by Vol. purity. The extrusion behavior of almost pure aluminum is particularly suitable for the production of a torsion bar in a cold forming process. Due to the good defbnnabUity and me extruMon behavior of non-ferrous metals, here;, in particular aluminum or copper, for example,- it has also become possible in a simple manner for the torsion bar to be provided cylindrical'or prismatic. By the optimum production possibilities using the particularly adjusted material it is even easier to create different constructive variants of the torsion bar and the drive end/or locking elements as well. Therefore, it can be provided for the drive and/or the locking elements to be provided as toothed wheels or to be provided with catch elements having flattenings. In mis context it has also become possible for a transfer between die drive and/or the locking elements and the torsion bar to be provided in the form of & conical section or a flute. Therefore, by the use of a non-ferrous meted and, in particular, a light metal such as aluminum, ideal constructive embodiments with optimum torsion behavior as well as optimum transfer of force can be achieved in me drive and/or locking elements. m the following description, additional features and particular advantages of the invention are explained in greater detail using the drawing: Figure 1 shows an example o f a torsion bar provided With drive and/or locking elements embodied at the ends thereof. The tonion bar 1 shown serves for ute in belt winders for safety belts. At its end sections, drive and/or locking elements 2 and/or 3 are'provided, which can be coupled with respective device* in order to allow a tingle or multiple rotations of the tonion bar under particular stress of the safety belt and thus to act as a type of shock absorber. The torsion bar 1 including tike drive and/or locking elements '1 and/or 3 embodied at the ends thereof are produced in one piece from a non-ferrous metal in a cold forming process using various impact extrusions in order to achieve variou; torques with constant sizes of the drive and/or blocking elements and various diameters of the torsion bar. The drive and/or locking elements 2 and/or 3 located at the ends are provided with equal or larger exterior dimensions than the torsion bar I itself. According to the prevent invention, the tana non-ferrous metal* essentially define* light metals and copper or copper alloys. Among the non-ferrous metals, copper, for example is a suitable material. Among ihe light metals, in particular aluminum is advantageous for producing a torsion bar in « cold forming processes. Here, it is advantageous when aluminum is used with up to 99.5 % by Vol. purity. With respect to construction, considerable improvements have become possible by the newly used materials. The torsion bar 1 can be constructed, for example, cylindrical or prismatic. The drive and/or locking elements 2 and/or 3 can be provided aa toothed wheels or as catching elements provided with flattening*. A transfer 4 in the form of a conical section or a flute can be provided between the drive and/or the locking elements 2 and/or 3 and the torsion bar 1. Within the scope of the invention additional wnbodimems are possible, of course, which result fiom the use of non-ferrous metals, ancl her* particularly aluminum, for the production of torsion bars in a cold fotming process. Therefore, the requirements of the automobile construction tor low temperature behavior of the torsion bar material can be fulfilled in an optimum dEuiner. We Claim: 1. A torsion bar for application in belt winders for safety belts, provided on end sections thereof with drive and/or locking elements for positive connection to respective devices, the torsion bar (1) including the drive and/or locking elements (2, 3) embodied at the ends thereof, is produced in one piece in a cold forming process and without machining from a non-ferrous metal which latter comprises a low temperature function. 2. A torsion bar as claimed in claim 1, wherein the drive and/or locking elements (2, 3) embodied at the ends thereof have equal or larger exterior dimensions than the torsion bar (1) itself. 3. A torsion bar as claimed in claim 1 or 2, wherein the torsion bar (1) is made from aluminum in a cold forming process. 4. A torsion bar as claimed in claim 1. wherein aluminum is used with up to 99,5 % by Vol. purity. 5. A torsion bar as claimed in any one of the claims 1 to 4, wherein the torsion bar (1) is constructed cylindrical or prismatic. 6. A torsion bar as claimed in any one of the claims 1 to 5, wherein the drive and/or locking elements (2, 3) are provided as toothed wheels or as catching elements provided with flattenings. 7. A torsion bar as claimed in any one of the claims 1 to 6, wherein a transfer section (4) is provided in the form of a conical section or a flute between the drive and/or locking elements (2, 3). |
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1908-DELNP-2006-Abstract-(16-08-2010).pdf
1908-DELNP-2006-Claims-(16-08-2010).pdf
1908-DELNP-2006-Correspondence-Others-(16-08-2010).pdf
1908-delnp-2006-correspondence-others-1.pdf
1908-delnp-2006-correspondence-others.pdf
1908-DELNP-2006-Description (Complete)-(16-08-2010).pdf
1908-delnp-2006-description (complete).pdf
1908-DELNP-2006-Drawings-(16-08-2010).pdf
1908-DELNP-2006-Form-1-(16-08-2010).pdf
1908-DELNP-2006-Form-2-(16-08-2010).pdf
1908-DELNP-2006-Form-3-(16-08-2010).pdf
1908-DELNP-2006-GPA-(16-08-2010).pdf
1908-DELNP-2006-Petition 137-(16-08-2010).pdf
| Patent Number | 247004 | |||||||||
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| Indian Patent Application Number | 1908/DELNP/2006 | |||||||||
| PG Journal Number | 13/2011 | |||||||||
| Publication Date | 01-Apr-2011 | |||||||||
| Grant Date | 24-Mar-2011 | |||||||||
| Date of Filing | 07-Apr-2006 | |||||||||
| Name of Patentee | SFS INTEC HOLDING AG., | |||||||||
| Applicant Address | NEFENSTRASSE 30, CH-9435 HEERBRUGG, SWITZERLAND. | |||||||||
Inventors:
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| PCT International Classification Number | B60R 22/28 | |||||||||
| PCT International Application Number | PCT/EP2004/053276 | |||||||||
| PCT International Filing date | 2004-12-06 | |||||||||
PCT Conventions:
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