DE2313348A1 - ROLLER DEVICE FOR SEAT BELTS, IN PARTICULAR FOR MOTOR VEHICLES - Google Patents

Description

(0221) 825- Z / DR - 2 Sp Uk

Patent application Retractor for seat belts, in particular for motor vehicles

The invention relates to a retractor for safety belts, especially for motor vehicles, with a spring-loaded roll-on spindle that rolls up the belt when not in use and below when in use holds light tension against the occupant and wherein a blocking device as a function of a belt acceleration and / or a vehicle deceleration the roll-up spindle connects to the roll-up housing via a deformation element.

Roll-up devices of the type mentioned are available in a large number of embodiments known. So it was already proposed to use a sheet metal strip as a deformation element, which as soon as the Belt tension exceeds a predetermined value, with energy consumption is deflected and rolled up.

The object of the invention is to provide a retractor of the type mentioned at the beginning To create a way in which another deformation element is used, which can be placed on constant energy consumption.

GB-118 / March 8, 1973 - 2 -

309842/0804

Seat of the company: Cologne - Regielergericht Köln, HHB 84 - Chairman of the supervisory board: Max Ueber Management board: Hans-Adolf Barthelmeh. Chairman Franz J. Bohr - WaJdemar Ebers - John G. H. Hirsch - Wilhelm Inden - Alfred Langer - Hans Schaberger Stef representative: Klaus-Dieter Banzhaf ■ Horst Bergemam - Paul A Guckel - Hans-Joachim Lehmann

According to the invention, this object is achieved by the blocking device the winding spindle is supported against a metal sleeve via a thread-nut arrangement, which can be axially crushed against a housing wall, as soon as the belt tension exceeds a predetermined value.

The thread-nut arrangement consists of a thread on the Roll-up spindle and a nut that is non-rotatably connected to the roll-up spindle via a shear pin.

The metal sleeve can be corrugated radially.

The metal sleeve is arranged coaxially to the roll on spindle.

The metal sleeve is preferably part of the inertial member of the blocking device.

The roll-up device according to the invention enables in the event of a collision, in which the belt tension exceeds a predetermined value, a further slackening of the belt with energy consumption and thus a decrease the deceleration values stressing the occupant.

The invention is illustrated by means of one in the accompanying drawing Embodiment explained in more detail.

The figure shows a vertical section through a roll-up device according to FIG the invention.

A retractor according to the invention has a housing 10 which is shown in a motor vehicle in a fastening point for a seat belt can be attached.

GB-118 / March 8, 1973 - 3 -

309842/0804

A winding spindle 11 is rotatably mounted in the housing 10 and is via a Coil spring (not shown) accommodated at one end 12 of the housing 10 is loaded in the direction of rolling up the belt.

On the other side of the housing 10, the roll-up spindle 11 extends through a bearing 13 in a cylindrical portion 14 of the housing 10. The end 15 of the roll-on spindle 11, which is in section 14, is with a Thread 16 provided. A nut 17 is provided with a corresponding internal thread and arranged on the roll-on spindle 11. A relative However, rotation of the nut 17 and the roll-on spindle 11 is controlled by a shear pin 18, which extends radially through the nut 17 and the winding spindle 11. The outer surface of the nut 17 is with a Provided coarser thread on which an inertia member 19 provided with a corresponding internal thread is arranged. A radially corrugated one Metal sleeve 20 is arranged coaxially to the reeling spindle 11 and is at one end with the inertia member 19 and at its other end with a Coupling member 21 connected. A weak coil spring 22 normally holds the coupling member 21 out of engagement with coupling teeth 23 in the housing 10. The inertia β member 19 is therefore in contact with the shoulder 24 held on the nut 17. A cover 25 closes the cylindrical section 14 of the housing 10 and carries a bearing washer 26 for the nut 17.

If the belt is slowly pulled out, the roll on spindle 11 and rotates the coil spring is tensioned, but the coupling member 21 does not engage.

However, if the belt is pulled out suddenly, 'e.g. by a sudden movement of the occupant with respect to the vehicle, as occurs in the event of a collision of the vehicle, the inertia member 19 decelerates a rotation compared to the suddenly accelerated on roll spindle 11 and caused thereby a relative movement between inertia member 19 and nut 17,

GB-118/8. March 1973 - 4 -

309842/0804

whereby the resulting axial movement dag coupling member 21 in the Coupling teeth 23 snaps into place. This will stop any further rotation of the rewind spindle 11 prevents until the belt tension exceeds a predetermined value and the shear pin 18 tears off. As soon as the shear bolt 18 breaks, Can the roll on spindle 11 relative to the nut 17 continue to rotate. This relative rotation of roll on spindle 11 and nut 17 results in an axial movement the nut 17 through which the metal sleeve 20 is crumpled. Since 20 energy is required to crumple the metal can, the belt can only be pulled out further with energy consumption, causing high delay loads of the occupant can be avoided.

The corrugated metal sleeve 20 is designed so that it is under as possible constant energy consumption is crushable. The one when the metal can crumple 20 occurring reaction force at the end 15 of the roll-on spindle 11 is absorbed by the cover 25. The here between the end of 15 the Aufr oll spindle 11 and the cover 15 occurring friction continues to decrease the abrupt delay of the occupant.

GB-118 / March 8, 1973

309842/0804

Claims (5)

S 7313348 Claims / 1. J Roll-up device for seat belts, especially for motor vehicles, with a spring-loaded roll-up spindle, which rolls up the belt when not in use and holds it under slight tension against the occupant when in use and with a blocking device depending on a belt acceleration and / or a vehicle deceleration, the rewind spindle via a deforma- connecting element with the roll-up housing, characterized by that the blocking device (19/23) the winding spindle (11) via a thread-nut arrangement (16/17) against a Metal sleeve (20) is supported, which is axially crumple against a housing wall as soon as the belt tension exceeds a predetermined value. 2. Roll-up device according to claim 1, characterized in that the thread-nut arrangement consists of a thread (16) on the Roll-up spindle (11) and a nut (17), which is rotatably connected to the roll-up spindle (U) via a shear pin (18). 3. Roll-up device according to claims 1 and 2, characterized in that that the metal sleeve (20) is radially corrugated. 4. Roll-up device according to claims 1 to 3, characterized in that that the metal sleeve (20) is arranged coaxially to the roll-up spindle (11). 5. Roll-up device according to claims 1 to 4, characterized in that that the metal sleeve (20) is a part of the inertia member (19) of the blocking device (19/23). GB-118 / March 8, 1973 3 09842/0804 Blank page