WO2007000290A2

WO2007000290A2 - Safety belt comprising a winding and locking device for a belt provided with a thickened part

Info

Publication number: WO2007000290A2
Application number: PCT/EP2006/006081
Authority: WO
Inventors: Thomas Magnusson; Dan Brase
Original assignee: Autoliv Development Ab
Priority date: 2005-06-29
Filing date: 2006-06-23
Publication date: 2007-01-04
Also published as: DE102005030704A1; WO2007000290A3

Abstract

The invention relates to a safety belt comprising a winding device (5) for a belt strap (1) and a locking device for locking the belt strap (1) winding and unwinding according to inertia. The belt strap is provided with a thickened part (2). At least one contact element (3) is associated with the belt strap (1), is arranged upstream of the winding device (5) and interacts with the thickened part (2) when the belt strap (1) is wound and brakes it.

Description

safety belt

The invention relates to a safety belt with a retractor for a webbing and a locking device that locks the rolling and rolling of the webbing dependent on inertia. Such a seat belt is provided in particular in motor vehicles.

In so-called automatic belts mobility of the belt is locked when a certain acceleration acts on the webbing. In this case, a flywheel inertia is scanned over a Gurtbandabtastung so that the webbing can be locked against rolling or peeling by acceleration instead of speed. This inertial scanning operates independently of the direction of a reeling drum and thus independent of the direction of movement of the webbing. Therefore, locking is generally initiated when the acceleration of the webbing is greater than a sample, both during unwinding and when rolling up. If the webbing suddenly stops during retraction and further movement is inhibited, a high negative acceleration is sensed and the locking mechanism is triggered. Thus, there is a risk that the retractor locks when almost the entire webbing is rolled up on the drum, so that the webbing can not be unrolled and a solution of the lock by further rolling is not possible because the remaining Aufrollweg is too short ..

In order to prevent such a locking situation in the rolled up state, a belt brake is proposed in DE 37 05 455 A1, which is coupled to a retractable frame and having a pivotable brake member with a finger which runs over the outer periphery of the safety belt on the drum. The brake part has a portion which, when the drum with the Webbing fills so inclined that it comes into frictional engagement with a surface of the seat belt and retards the pull-in speed so that it does not come to an abrupt negative acceleration. This device, in which the braking effect is increased with increasing drum circumference, is relatively complex.

Object of the present invention is to provide a safety belt with a retractor, with the effective locking of the seat belt in the rolled state can be easily avoided.

According to the invention the object is achieved by a safety belt with the features of claim 1. Advantageous embodiments and further developments of the invention are described in the dependent claims.

The safety belt according to the invention with a retractor for a webbing and a locking device, the inertia locks the rolling and rolling of the webbing provides that the webbing has a thickening and the webbing at least one contact element is assigned, which is upstream of the retractor and with curling the thickening interacts and decelerates the webbing. Instead of a spring-loaded braking device which applies a braking force to the webbing as a function of the circumference of a belt drum is prevented in a simple manner by a webbing arranged on the thickening, which interacts with a contact element, that only shortly before the complete Rolling the webbing on the retractor a well negative acceleration is detected and accordingly a lock is activated. For this purpose, it is provided that the thickening and the contact element come into contact before a complete reeling of the webbing on the retractor and either brake the webbing so, that no blocking effect occurs or that so much webbing is to be rolled up that after unlocking the locking device can be done.

A development of the invention provides that the contact element is designed in the form of a gap guide, in which the webbing is guided. In the applied state, the webbing runs with a simple material thickness through the gap guide, wherein the single-layer webbing is guided with a small clearance within the gap guide. The game is designed so that upon impact of the thickening on the contact element, the webbing or the thickening is pressed against the wall of the gap guide, so that a gentle deceleration of the webbing occurs. The contact element can thereby be resiliently mounted and designed as a spring arm, for example, as a separate spring arm, regardless of the scope of the retractor upon contact with the thickening on the webbing causes a braking effect to prevent locking of the retractor in the rolled state.

The contact element may be arranged in a belt guide or designed as such, wherein for supporting a gentle braking, the contact element has an inlet slope in the direction of the retractor. By such an inlet slope, it is possible to slowly initiate the braking process and to avoid a sudden deceleration. Alternatively or additionally, the thickening may also have an inlet slope.

The thickening may be formed as a knob inserted in the webbing, a fabric reinforcement or doubling, a partial broadening or as another form-fitting element which is arranged on or in the webbing and causes a thickening in an extension of the webbing perpendicular to the reeling direction. As a thickening and a broadening is considered. The thickening is designed so that it interacts with the contact element in a manner that the thickening is clamped or the webbing is deflected perpendicular to Gurtbewegungsrichtung. The pinching or the deflection reduces the Gurteinzugsgeschwindigkeit and prevents inertia-dependent locking of the retractor.

A further development of the invention provides that the contact element has a first contact surface which is associated with the thickening and which initially comes into contact with the thickening when the webbing is rolled up. In the retraction direction behind the first contact surface, an insertion region is arranged, which adjoins the first contact surface into which the thickening can be introduced. As a result, a first deceleration is performed by the first contact surface and, moreover, a path is provided up to a stop at the end of an insertion area, which allows the belt to track and thereby the locking of the retractor is released.

Embodiments of the invention will be explained in more detail with reference to the accompanying figures. Show it:

Figure 1 is a side sectional view of a first

Feeder brake;

Figure 2 - a variant of Figure 1;

Figure 3 - a retraction brake with a chicane;

Figure 4 - a retraction brake with a first contact surface and an insertion region; such as

Figure 5 - a variant of the retraction brake.

Figure 1 shows a part of a safety belt with a webbing 1 on which a thickening 2 is arranged in the form of an attached button or a bar. This webbing 1 can be rolled up and unrolled by a retractor, not shown. This Aufrolleinrichtung locks when large accelerations occur, for example in the event of an accident, the rolling, so that a seat occupant is effectively retained by the locked seat belt. During slow movements, for example, in a post-Vome-bending or during normal driving, the locking device does not trigger, so that a comfortable movement within the vehicle is possible. If the webbing 1 is rolled up, it moves in the direction of the arrow in the direction of the belt guide 4, on which a contact element 3 in the form of a gap guide is formed. When rolling up, the webbing 1 passes through the gap guide 3 of the belt guide 4 until the thickening 2 comes into contact with the contact element 3. The webbing 1 is braked and enters a narrow slot, which the contact element 3 is formed. The slot is formed by elastic arms of the contact element 3. If the webbing 1 is rolled up so that the thickening 2 comes into contact with the contact elements 3, give the elastic arms, which due to the one-sided storage on the side facing away from the contact point, the friction between the thickening 2, for example a plastic button, and the elastic arms increasingly increased. As a result, the webbing 1 is braked slowly to a standstill, so that an unwanted locking when rolling up the webbing 1 does not occur.

In FIG. 2, the seatbelt is shown with a webbing and a retractor 5, in which a locking mechanism is simultaneously arranged, which blocks a rolling up or unrolling of the webbing 1 when a predetermined acceleration value is exceeded. Again, the webbing 1 passes through a formed as a gap guide contact element 3, wherein the contact element 3 is integrated in the belt guide 4. If the thickening passes through the gap of the contact element 3, the friction between the contact element 3 and the webbing 1 is increased, whereby the winding speed is gently braked and locking is prevented.

FIG. 4 shows in plan view a webbing 1 with a plastic button 2 fastened thereon as a thickening. The webbing 1 passes through a webbing guide 4, in which a baffle is formed as a contact element 3. If the Ver-thickening 2 is passed through the webbing guide 4, it comes into contact with a deflection or guide surface, so that a perpendicular to the direction of deflection takes place. By the lateral displacement of the button 2, the resistance to rolling increases, because the plastic button is displaced laterally together with the webbing 1. As a result, the webbing 1 is braked. If a lock occurs, this can be solved by the Belt 1 is retracted further, causing the lock releases. In the unlocked position, the knob 2 takes the upper position.

FIG. 4 shows a further variant of the safety belt with the retraction brake, in which a first contact surface 6 is arranged on a resilient arm. The contact surface 6 is associated with a thickening 2 in the form of a plastic strip or a plastic button and part of a belt guide 4. If the webbing 1 is withdrawn, the thickening 2 comes into contact with the first contact surface 6, which is obliquely aligned and forms an inlet slope. Depending on the Aufrollgeschwindigkeit and inclination angle of the first contact surface, a lock may occur or a gentle deceleration occur. By further retraction of the webbing 1 in the direction of the arrow, the button 2 or the thickening passes into an insertion space 7, since the arm on which the first contact surface 6 is arranged elastically springs downwards. This allows the webbing to travel a sufficient distance, e.g. 10 to 15 mm, give way in the winding direction, so that any lock that has occurred is released. When the safety belt is applied, the thickening 2 can be easily pulled out of the insertion area 7 due to the elastic configuration of the support arm on which the first contact surface 6 is arranged.

FIG. 5 shows a variant of the invention in which the strap 1 has a thickening 2, which is designed as a broadening. If the webbing 1 runs through the belt guide 4, the widening 2 strikes the contact element 3 aligned parallel to the reeling direction. The webbing 1 then bears against the contact element 3 and is compressed. The friction between the webbing 1 and the contact element 3 increases and the webbing 1 is gradually delayed shortly before the complete rolling, whereby a locking of the locking mechanism, not shown, can be prevented.

Claims

claims

1. Safety belt with a retractor (5) for a webbing (1) and a locking device that locks the rolling and rolling of the webbing (1) dependent on inertia, characterized in that the webbing (1) has a thickening (2) and the Belt web (1) is associated with at least one contact element (3), which is upstream of the roll on device (5) and when rolling the webbing (1) with the thickening (2) interacts and the webbing (1) decelerates.

2. Safety belt according to claim 1, characterized in that the contact element (3) is a gap guide, in which the webbing (1) is guided.

3. Safety belt according to claim 1, characterized in that the contact element (3) is designed as a spring arm.

4. Safety belt according to one of the preceding claims, characterized in that the contact element (3) in a belt guide (4) is arranged.

5. Safety belt according to one of the preceding claims, characterized in that the contact element (3) has an inlet slope in

Direction to the retractor (5).

6. Safety belt according to one of the preceding claims, characterized in that the thickening (2) is designed as a button, fabric reinforcement, double layer, widening or positive locking element.

7. Safety belt according to one of the preceding claims, characterized in that the thickening (2) in such a way interacts with the contact element (3) that the thickening (2) is clamped or the webbing (1) is deflected perpendicular to Gurtbewegungsrichtung.

8. Safety belt according to one of the preceding claims, characterized in that the contact element (3) has a first contact surface (6) which is associated with the thickening (2), and in the winding direction an insertion region (7) connects, in the thickening

(2) is insertable.