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US 4,006,644 AGranted
Apparatus for tensioning a safety belt
AssigneeVolkswagenwerk Aktiengesellschaft
InventorEdmar Beier
Life of this patent
Estimating the term…
Abstract
An apparatus for tensioning a safety belt in response to applied gas pressure makes use of hollow winding roller attached to the safety belt and having a selected contour on its inner surface. A piston in a working cylinder is located coaxially adjacent to the roller. When the piston is displaced by the application of gas pressure it projects into the roller and engages the contouring on the inside surface of the roller to cause the roller to rotate in the direction of belt tightening.
Claims5
Apparatus for tensioning a safety belt in response to applied gas pressure, comprising:
- a hollow winding roller attached to said safety belt and having helical arial grooves on its inner surface;
- a cylinder, coaxially adjacent to said roller;
- a piston, arranged in said cylinder and displaceable in response to said gas pressure and having a piston rod with a soft metal sheathing to project into said roller, and burrow into said grooves, and to cause rotation of said roller in a safety belt tensioning direction.
Dependencies are inferred from the claim text.