# US 4,392,619 A · Automatic roll-up device for a safety belt > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,392,619 A - Document ID: US4392619A - Status: Granted - Kind: A - Application number: 06/242,179 - Filed: 1981-03-10 - Granted: 1983-07-12 - Earliest claimed: 1980-03-13 - Assignees: Repa Feinstanzwerk GmbH - Inventors: Artur Fohl - Web page: https://patentgrep.com/patent/US4392619A ## CPC - B60R 22/405: responsive to belt movement and vehicle movement - B60R 22/42: having means for acting directly upon the belt, e.g. by clamping or friction {(not combined with the retractor B60R22/185)} - B60R: VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR ## Abstract Automatic roll-up device for retarding movement of a safety belt when a predetermined acceleration or deceleration is exceeded, combined with a braking- or clamping device in which the retarded belt is arrested. The roll-up device has a retarding mechanism which blocks a control disc causing braking of the belt roller. This causes a change in movement of the belt which activates the braking- or clamping device. The latter immediately arrests movement of the belt and absorbs any pulling forces which would have been exerted against the retarding mechanism. The roll-up device can be of light-weight construction. ## Claims ### Claim 1 Automatic roll-up device and belt arresting device for retarding movement of a safety belt of a vehicle and for arresting movement of the safety belt, which comprises a housing for the roll-up device, a rotatable belt roller shaft mounted in the housing, a belt roller on which the belt is wound mounted on the belt roller shaft, a retarding mechanism for retarding unwinding of the belt comprising a control disc with control teeth at its periphery freely rotatable relative to the belt roller shaft, a vehicle sensitive actuating sensor which is actuated when the vehicle exceeds a permissible acceleration or deceleration for impeding rotation of the control disc by contact with said control teeth, a spring supported by the control disc, driver means rotatable with the belt roller shaft which, after rotation of said control disc is impeded, rotates against the force of said spring around a predetermined angular path to retard movement of the belt while permitting withdrawal of the belt, outer teeth affixed to the housing around the control disc, and a belt sensitive actuating sensor in the form of an inertial mass carried by the control disc for impeding rotation of the control disc by contact with said outer teeth, a belt arresting device through which the belt from said roll-up device passes, and arresting means in said belt arresting device to arrest the belt upon change in movement of the belt therethrough due to retarding the belt by the retarding mechanism. ### Claim 2 (depends on 1) Automatic roll-up device according to claim 1, wherein said driver means is a driver disc, adjacent to the control disc, which driver disc is in fixed connection with the belt roller shaft, and wherein the control disc has a concentric cut-out of annular shape with said spring therein, and wherein said driver means comprises a driver pin which engages in the concentric cut-out of annular shape which retains the spring. ### Claim 3 (depends on 2) Automatic roll-up device according to claim 2, wherein said driver pin extends through a passage opening in the driver disc into the cut-out, and wherein the drive pin is prevented from being shifted axially outward by the blockage of said passage opening by a tension washer, which is provided for applying axial pressure at the control disc and driver disc with respect to the belt roller shaft. ### Claim 4 (depends on 1) Automatic roll-up device according to claim 1, wherein the control disc is coupled with the belt roller through a slip-clutch. ### Claim 5 (depends on 1) Automatic roll-up device according to claim 1, wherein said slip clutch is formed by a drive disc which is fixedly connected to the belt roller shaft with respect to rotation and bears on the control disc, said driver disc acting as said driver means and also acting as said spring by rotating against the force of the drive disc bearing on the control disc. ### Claim 6 (depends on 1) Automatic roll-up device according to claim 1, wherein the vehicle-sensitive activating sensor has a locking lever which can engage with the outer teeth of the control disc, and wherein a spring urges the belt-sensitive inertia mass to normal non-activating position spaced from the inner teeth, and wherein the inertia mass can swing against the force of said spring, and can lock in position with the set of inner teeth which are fixedly arranged around and spaced from the control disc. ### Claim 7 (depends on 1) Automatic roll-up device according to claim 1, wherein a support collar is fixedly mounted with respect to rotation on the belt-roller shaft, and wherein the control disc is supported on the collar so that the control disc can rotate relative to the collar, and wherein the collar is coupled with the belt roller by coupling claws or coupling teeth. ### Claim 8 (depends on 1) Automatic roll-up device according to claim 1, wherein the retarding mechanism, belt roller and the housing of the automatic belt roll-up device are made of aluminum. ### Claim 9 (depends on 1) Automatic roll-up device according to claim 1, wherein the retarding mechanism, belt roller and the housing of the automatic belt roll-up device are made of plastic. ### Claim 10 (depends on 1) Automatic roll-up device according to claim 1, wherein the retarding mechanism, belt roller and activating sensors, and also the belt arresting device are combined within a single structural unit. ### Claim 11 (depends on 1) Automatic roll-up device and belt arresting device according to claim 1, wherein the belt arresting device comprises a stationary clamping bar fastened to the housing and disposed behind one surface of the belt passing from the automatic roll-up device, a braking roller slidably supported in slots in the housing around which the belt is partly wrapped, said braking roller having a smooth, non-skid surface of high friction, and has, at both sides of the smooth roll surface, locking teeth, a locking pawl hingeably supported in the housing, said locking pawl having locking teeth spaced a short distance from the locking teeth of the braking roller, a clamping roller slideably supported in slots in the housing disposed adjacent the belt surface opposite the clamping bar to effect clamping of the belt when the clamping roller moves toward the belt, said clamping roller disposed between said belt surface and the locking pawl whereby when the belt movement is retarded, the braking roller with its locking teeth press into the locking teeth of the pawl which bears onto the clamping roller causing clamping of the belt and arresting it thereby.