Device for tightening a safety belt of a motor vehicle
First Claim
Patent Images
1. A drive mechanism comprises a guide pipe, a piston which is guided inside the guide pipe and can be driven by means of a propellant that is generated by a gas generator and a traction mechanism which connects the piston with a part to be driven and with a pressure chamber that is formed in the guide pipe whereby the propellant which is generated in the interior of the piston is discharged from the pressure chamber via at least one outlet opening in the piston, wherein:
- the traction mechanism (15) comprises a traction cable and is rigidly connected with the piston (2) via a cable pressing (17) which has a larger diameter than the traction cable,the gas generator (1) which is arranged in the piston (2) has a propellant outlet side (3) which is directed towards an interior space (4) of the piston and opened by propellant ignited in the gas generator,the interior space (4) of the piston is constructed as a combustion chamber for the propellant which is discharged from the gas generator and is provided with at least one outlet opening (5), andthe interior space (4) of the piston simultaneously serves for accommodating the cable pressing (17), said cable pressing (17) comprising a support ring which is rigidly braced on a base of the piston in the interior space of the piston.
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Abstract
A drive mechanism has a guide pipe, a piston which is guided in the guide pipe and is driven by a propellant that is generated by a gas generator, and a traction mechanism which connects the piston to the component to be driven.
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Citations
21 Claims
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1. A drive mechanism comprises a guide pipe, a piston which is guided inside the guide pipe and can be driven by means of a propellant that is generated by a gas generator and a traction mechanism which connects the piston with a part to be driven and with a pressure chamber that is formed in the guide pipe whereby the propellant which is generated in the interior of the piston is discharged from the pressure chamber via at least one outlet opening in the piston, wherein:
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the traction mechanism (15) comprises a traction cable and is rigidly connected with the piston (2) via a cable pressing (17) which has a larger diameter than the traction cable, the gas generator (1) which is arranged in the piston (2) has a propellant outlet side (3) which is directed towards an interior space (4) of the piston and opened by propellant ignited in the gas generator, the interior space (4) of the piston is constructed as a combustion chamber for the propellant which is discharged from the gas generator and is provided with at least one outlet opening (5), and the interior space (4) of the piston simultaneously serves for accommodating the cable pressing (17), said cable pressing (17) comprising a support ring which is rigidly braced on a base of the piston in the interior space of the piston. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A drive mechanism comprises a guide pipe, a piston which is guided inside the guide pipe and can be driven by means of a propellant that is generated by a gas generator and a traction mechanism which connects the piston with a part to be driven and with a pressure chamber that is formed in the guide pipe, whereby the propellant which is generated in the interior of the piston is discharged from the pressure chamber via at least one outlet opening in the piston, wherein:
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the gas generator (1) which is arranged in the piston (2) has a propellant outlet side (3) which is directed towards an interior space (4) of the piston and opened by propellant ignited in the gas generator, the interior space (4) of the piston is constructed as a combustion chamber for the propellant which is discharged from the gas generator and is provided with at least one outlet opening (5), a return lock (9) is provided with at least one locking element (10,27) which can be moved radially with respect to the axis of the guide pipe (7), the at least one locking element being guided on a conical projection (11) of the piston (2) wherein the at least one locking element (10,27) can be moved freely on the inner wall of the guide pipe (7) in the driving direction, and wherein the at least one locking element can, if the piston moves opposite to the driving direction, be moved by the conical projection (11) to engage with the inner wall of the guide pipe (7) and lock in the movement of the piston, and the conical projection (11) is hollow and comprises the at least one outlet opening (5). - View Dependent Claims (18, 19, 20)
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21. A drive mechanism comprises a guide pipe, a piston which is guided inside the guide pipe and can be driven by means of a propellant that is generated by a gas generator and a traction mechanism which connects the piston with a part to be driven and with a pressure chamber that is formed in the guide pipe, whereby the propellant which is generated in the interior of the piston is discharged from the pressure chamber via at least one outlet opening in the piston, wherein:
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the gas generator (1) which is arranged in the piston (2) has a propellant outlet side (3) which is directed towards an interior space (4) of the piston and opened by propellant ignite in the gas generator, the interior space (4) of the piston is constructed as a combustion chamber for the propellant which is discharged from the gas generator and is provided with at least one outlet opening (5), the traction mechanism (15) comprises a traction cable and is rigidly connected with the piston (2) via a cable pressing (17) which has a larger diameter than the traction cable, and the at least one outlet opening (5) is formed by a recess between a support ring (19) that is arranged on the cable pressing (17) and the inner wall of the piston, whereby said support ring is rigidly braced on a base of the piston in the interior space of the piston.
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Specification