Tensioning device for a seat belt component

Abstract

A seat belt tensioning device with a gas generator for generating a compressed gas, a piston driven by the compressed gas, a tension cable which is connected to the piston and is connectable to a seat belt component to be set into a tensioning movement, a tensioner tube for receiving and guiding the piston, and a guide block that forms a cable guide and in which a receptacle receiving the gas generator and a pressure chamber connected in terms of flow to the receptacle are formed, wherein the guide block is connected to the tensioner tube, and the tension cable runs rectilinearly in a piston movement direction from the tensioner tube through the pressure chamber, wherein the guide block forms a linear guide adjoining the pressure chamber such that the tension cable can be led out of the guide block on the side opposite the tensioner tube.

Claims

1. A tensioning device for a seat belt component, comprising; a gas generator for generating a compressed gas, a piston that can be driven by the compressed gas, a tension cable that is connected to the piston and is connectable to the seat belt component to be set into a tensioning movement, a tensioner tube for receiving and guiding the piston, and a guide block that forms a cable guide, and forms a receptacle receiving the gas generator, and further forms a pressure chamber connected in terms of flow of the compressed gas to the receptacle, wherein the guide block is connected to the tensioner tube, and the tension cable runs rectilinearly in a piston movement direction from the tensioner tube through the pressure chamber, wherein the guide block forms a linear guide that adjoins the pressure chamber and is configured in such a manner that the tension cable is led out of the guide block parallel to the piston movement direction on a side opposite the tensioner tube wherein, in the linear guide, at least one resistance element is arranged, which counteracts an unintentional movement of the tension cable, wherein the at least one resistance element is formed by a component inserted into the linear guide, the component is made of plastic, and the at least one resistance element formed by the component has projections which are reduced in height at the beginning of a tensioning process due to friction.

2. A tensioning device for a seat belt component, comprising; a gas generator for generating a compressed gas, a piston that can be driven by the compressed gas, a tension cable that is connected to the piston and is connectable to the seat belt component to be set into a tensioning movement, a tensioner tube for receiving and guiding the piston, and a guide block that forms a cable guide, and forms a receptacle receiving the gas generator, and further forms and a pressure chamber connected in terms of flow of the compressed gas to the receptacle, wherein the guide block is connected to the tensioner tube, and the tension cable runs rectilinearly in a piston movement direction from the tensioner tube through the pressure chamber, wherein the guide block forms a guide that adjoins the pressure chamber and is configured in such a manner that the tension cable is led out of the guide block parallel to the piston movement direction on a side opposite the tensioner tube wherein, in the guide, at least one resistance element is arranged, which counteracts an unintentional movement of the tension cable, wherein the at least one resistance element is in the form of an S-shaped guide of the tension cable and provides a parallel offset of the tension cable.

3. A tensioning device for a seat belt component, comprising; a gas generator for generating a compressed gas, a piston that can be driven by the compressed gas, a tension cable that is connected to the piston and is connectable to the seat belt component to be set into a tensioning movement, a tensioner tube for receiving and guiding the piston, and a guide block that forms a cable guide, and forms a receptacle receiving the gas generator and, further forms a pressure chamber connected in terms of flow of the compressed gas to the receptacle, wherein the guide block is connected to the tensioner tube, and the tension cable runs rectilinearly in a piston movement direction from the tensioner tube through the pressure chamber, wherein a deflection guide is formed in the guide block, which is configured such that the tension cable can be led out of the guide block obliquely to the piston movement direction, the deflection guide adjoins the pressure chamber and is configured in such a manner that the tension cable is led out of the guide block on a side opposite the tensioner tube wherein, in the deflection guide, at least one resistance element is arranged, which counteracts an unintentional movement of the tension cable, wherein the at least one resistance element is formed by a component inserted into the deflection guide, the inserted component is made of plastic, and the at least one resistance element is formed by the component has projections which are reduced in height at the beginning of a tensioning process due to friction.

4. The tensioning device according to claim 3, wherein the component forming the at least one resistance element is arranged both in the guide block and in the deflection guide.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The invention and the technical environment are explained below by way of example with reference to the figures. The following are shown schematically:

(2) FIG. 1 shows a tensioning device,

(3) FIG. 2 shows an independent component for forming a resistance element of the tensioning device according to FIG. 1, and

(4) FIG. 3 shows a detailed illustration of an additional embodiment of a tensioning device.

DETAILED DESCRIPTION

(5) The tensioning devices shown in FIGS. 1 and 3 in each case comprise a guide block 1 in which a receptacle 2 for a gas generator (not shown) is formed. The receptacle 2 is connected in terms of flow to a pressure chamber 3 formed in the guide block 1.

(6) A tension cable 4 is guided rectilinearly through the pressure chamber 3 and into a tensioner tube 5. Within the tensioner tube 5, the tension cable 4 is connected to a piston (not shown). The arrangement of the piston on the tension cable and in the tensioner tube is already mentioned in DE 10 2015 111 083 B4 mentioned in the introduction, to which reference is made in this regard. However, the arrangement of the piston is also not important for the present invention.

(7) When triggered, the gas generator generates a compressed gas that is guided through the pressure chamber 3 into the tensioner tube 5 and there drives the piston, and thus also the tension cable 4, in a piston movement direction 6.

(8) On the side facing away from the tensioner tube 5, the guide block 1 is formed such that the tension cable 4 is guided in parallel alignment with (FIG. 1) or with a parallel offset (FIG. 3) out of the guide block 1. Thus, the guide block 1 has a linear guide 7. In addition, the guide block 1 also has a deflection guide 10, so that the tension cable 4 could also be guided out of the guide block 1 transversely to the piston movement direction 6 (not shown in the figures).

(9) In order to prevent the tension cable 4 and thus the piston from being unintentionally moved prior to a tensioning process, a resistance element 8 is provided.

(10) According to the embodiment of FIGS. 1 and 2, the resistance element 8 is formed by projections on an independent component 9. The independent component 9 is shaped such that it is arranged with a holding section in the deflection guide 10, and with the section having the resistance element 8 in the linear guide 7. At the beginning of a tensioning process triggered by the gas generator, the projections on the individual component 9 are reduced in height due to the friction with the tension cable 4, so that the friction or the resistance also decreases.

(11) According to the embodiment of FIG. 3, the resistance element 8 is formed by a type of chicane, so that the tension cable 4 is deflected in an S-shaped manner, thereby providing resistance

(12) While the above description constitutes the preferred embodiment of the present invention, it will be appreciated that the invention is susceptible to modification, variation and change without departing from the proper scope and fair meaning of the accompanying claims.