DD200605A1 - AUTOMATIC LOCKING DEVICE FOR A SAFETY ROLLER BELT - Google Patents

Abstract

A safety belt combines all advantages, in addition to the securing effect for the person has a retractor mechanism as a belt storage and automatic response. The invention describes a solution for such an automatic response. It builds on the combination of conventional principles of action. Caused by an unwanted acceleration or deceleration of the motor vehicle, an electrical pulse is generated by means of a mechanical-electrical converter - mercury switch tube, accelerometer or initiator - which is used to lock the retractor. An electromagnet is in each case the mechanism triggering the lock. Above all, this solution combines the following advantages over known solutions: high durability and availability, insensitive to wear and dirt; Controllability of several safety roller belts by means of a pulse converter; Any position arrangement of the rolling belt in the vehicle and uncomplicated functional control even with simple sensitivity.

Description

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Automatic locking device for a safety belt

Field of application of the invention

Seat belts have become the norm for operating vehicles through national legislation · The trend towards safety seat belts can be traced back to its special features:

- Elimination of the cumbersome Einsteilens on appropriate body measurements and

- Freedom of movement in the belted state due.

The safety 8-belt then combines all its advantages, if he holds only by an automatic-acting locking the person to be secured, if there is a risk of injury threatens.

Characteristic of known technical solutions

The previously known versions of automatic sling belts operate predominantly by utilizing the inertia of mass-laden bodies in a purely mechanical way. Only these functional principles appear functional and are practically implemented in known solutions. It will continue between

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the so-called simple and double sensitivity distinguished.

With simple sensitivity, at a defined minimum acceleration or deceleration of the vehicle, the inertia of a body bearing a body (ball, pendulum) is used to trigger a mechanically acting locking mechanism. "As a rule, the lock is made by positive engagement, e.g. by two toothed machine elements, the intervention of which is caused by the release mechanism. The twofold sensitivity additionally acts when exceeding a defined belt deceleration speed or acceleration; their mechanism is determined by centrifugal or inertial forces.

In many embodiments, both sensitivities are structurally combined so that they have the same functional parts.

The described embodiments have disadvantages. Many of the mechanisms are subject to constant relative movement, so that wear of the individual parts is to be expected · In addition, the influence of dirt and the influence of temperature affect the sensitivity and safety of the system. The relative position of the vehicle itself to the trigger mechanism determines the function. Thus, the automatically working roller belt can not be mounted anywhere in the car at any or even variable location. This proves to be particularly disadvantageous in the attachment of roller belts for the rear seats.

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Safety belts with single sensitivity also do not allow a functional test by the user without significantly accelerating or decelerating the vehicle. This fact is a major reason for the production of dual speed webbing harnesses. The trend is for each vehicle occupant to put on a seatbelt prescribe · The existing solutions are designed in such a way that each individual belt needs its own complete automatic retractor and thus a mechanical impulse converter »

Object of the invention

The invention is based on the objective to develop a retractor that does not have the aforementioned disadvantages and can be fed from an economic point of practical use.

Features and features of the invention

The following circumstances and conditions characterize the features of the invention:

As a mechanical-electrical transducer, mercury-stop tubes, piezoelectric, inductive or capacitive accelerometers or initiators can be used.

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The switching pulse is caused by the action of inertia and acts as an electrical pulse to trigger the locking mechanism.

The triggering mechanism, a mechanical-electrical pulse converter, can be used simultaneously for a plurality of safety belts and can be located anywhere in the vehicle.

The universality and sensitivity of the automatic is by appropriate shaping and attachment of the pulse transformer and u. U · possible by damping ·

An adaptation is provided only by the locking mechanism - electromagnet - since the triggering of the lock takes place electromagnetically in each case ·

For the structural design of the roller belt mechanism with lock proven existing solutions can be used.

The automatic retractor is to be adapted to the conditions of the vehicle (installation location, on-board voltage etc.).

A functional check of the blocking device is possible in a simple manner by switching off the ignition voltage.

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Embodiment of the invention

1 shows a possible arrangement of the mechanical-electrical converter 1, the belt drum 2, an electromagnet 3 and the locking device 4, which in the example builds on a spur toothing. In the normal state, the electromagnet acts the spring so counter that the end-toothed discs 4 do not interlock. With appropriate acceleration of the electromagnet is switched off via the converter, the spring causes the intermeshing of the teeth. Further unwinding of the belt drum is prevented. The teeth are self-locking run, so that only with completely relaxed belt the lock is released. The connection between electromagnet 3 and transducer 1 is made by means of electric cables over unlimited lengths, i. the converter 1 \ can be accommodated in the motor vehicle at any point and you can control with a converter as many safety harnesses.

A mechanical-electrical transducer can be built on the basis of various principles of action - mercury stop tube, piezoelectric, inductive or capacitive acceleration sensor and inductive initiator - They are suitable for the application in question, taking into account certain characteristics ·

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Figure 2 identifies as an example the construction of a mercury stop tube consisting of mercury 1, switching contacts 2 and glass housing 3. When undesired accelerations or delays of a motor vehicle occur, the mercury changes its position in such a way that it causes the electrical connection of the contacts 2, due to the own conductivity, interrupts and thus makes the electromagnet de-energized ·

The principle according to Figure 3 builds on an initiator 1, which generates a switching pulse upon deflection of the ball 2 via an inductance change. The ball deflection in the calotte 3 is caused by the acceleration or deceleration of the motor vehicle and is dependent on the design of the calotte.

Claims (6)

232347 O R e r sa tion sa nsjarüchg 1 »Safety belt for motor vehicles, characterized in that in automatic belt locking devices, a pulse transformer is associated with one or more locking devices« 2. Safety belt for motor vehicles according to item 1, characterized in that the pulse converter is a controlled via the acceleration of the motor vehicle mechanical-electrical converter. 3 · Safety belt for motor vehicles according to item 2, characterized in that the mechanical-electrical converter is a mercury stop tube. 4. Safety belt for motor vehicles according to item 2, characterized in that the mechanical-electrical converter is a piezoelectric, inductive or capacitive acceleration sensor. 232347 O 5. Safety belt for motor vehicle according to item 2, characterized in that the mechanical-electrical converter iet an inductive initiator. 6. Safety belt for motor vehicles according to item 2, characterized in that an electrical lock for the commissioning of the motor vehicle is mounted, which excludes a use in non-applied safety belt (driver). For this a page drawings