DE202007008624U1 - Switch for a belt lock of a retaining system in vehicles comprises a contact piece formed as a contact spring having a trapezoidal or arc-shaped operating region which protrudes into a channel arranged laterally to a housing inner chamber - Google Patents

Abstract

Switch comprises a contact piece formed as a contact spring (7) having a trapezoidal or arc-shaped operating region (9) which protrudes into a channel (3) arranged laterally to a housing inner chamber. The contacts are connected by moving a slide (4) in the channel. Preferred Features: The trapezoidal or arc-shaped operating region starts close to the contact region of the contact spring and ends hanging in the direction of a tensioning site (10) or lies on the housing in the lower part of the channel.

Description

The The present invention relates to a switch operating in a buckle of restraint systems is used in motor vehicles and the proper locking the plugged into the buckle Tongue of the seat belt indicates.

Is known from the DE 43 38 485 A1 a set for fail-safe query seat belt buckle with micro-switch, wherein the microswitch is coupled with two locking parts of the lock independently involved functional parts such that the microswitch only at the two simultaneously standing in the locking position of the closure functions its closed and for the Triggering of further functional elements of the safety device established position occupies.

Farther is known by the company Eduard Hartmann GmbH a switch, the in buckles is used. This switch is a double contact switch, the contact springs or tongues in the unloaded state to the contact points contact each other and establish contact. One of the two Tongues is designed as a double contact tongue to the switching security increase. The switch is designed so that it is arranged laterally in the buckle housing is in such a way that the Inserting the tongue a slider made of an insulating material between the contact tongues is pushed. This slider remains behind the engagement of the belt tongue between the contact tongues of the switch and thus separates the contact. Thus, it is indicated that the seat belt put on and properly locked in the lock is.

There the switch has an open-topped housing to move the slide of an insulating material between the contact tongues to enable can from the outside through the opening of the buckle housing foreign matter, such as liquids or solid particles, penetrate. This can cause the safety function impaired This is because a break in contact incorrectly causes a proper interlock the belt tongue in the lock signals.

The Contact tongues are designed to bend outwards in the upper area an introduction of the Slider between the contact zones easier. This results in the upper area an approximate V-shape. Penetrating foreign matter is deposited in this area and then through the slider directly into the contact area brought.

Furthermore This switch is an automated assembly during production not possible, because the contact tongues are connected with appropriate cables have to, before getting into the switch housing be used and the tabs are designed such that she after installation, be under a certain preload. Together with the cables connected the contact tongues largely inserted by hand in the switch housing become.

Is known from the DE 202 04 318 U1 a switch for a buckle of restraint systems of motor vehicles to indicate that the belt tongue is inserted into the buckle and properly locked, with two contact plates, wherein a contact plate is formed after its contact-making end as a double contact tongue and these are arranged within the buckle, said contact areas of the contact plates are provided in a protected from foreign material upper housing interior of the switch housing, the switch housing is disposed within the buckle and a contact plate is formed as a contact spring with a hammer-shaped area at the contact end and a central arcuate area and the arcuate portion of the contact spring in a laterally disposed from the housing interior channel protrudes and the contact by moving a slider in the channel is switchable.

By the arcuate Design in the middle region of the contact part is the contact force at the contact point according to the leverage ratios to the clamping point low and the risk that at full operation of the Slider (due to its low height) an undesirable switch back (Shut down) of the contact takes place (Overtravel effect).

Of the Invention is therefore based on the object, a switch for a buckle of safety belt systems in motor vehicles in such a way that reaches the highest possible contact force and a switchback at more complete End position of the slider is prevented, with the switching contacts in a largely protected from penetrating dirt space inside the switch housing are arranged.

According to the invention the object is achieved in that the serving to indicate the proper locking of the belt tongue in the buckle switch is provided with two arranged in a protected from foreign material upper housing interior of the switch housing contact plates, wherein a contact plate is formed as a contact spring with a trapezoidal or arc-like actuating portion and this actuator of the contact spring arranged in a laterally from the housing interior protrudes th channel, which when switching a slider in the channel, the switching is effected.

The Trapezoidal or arcuate shape of the actuator begins near the contact area the contact spring and ends in the direction of clamping point floating or is in the lower part of the channel frictionally resiliently on the housing.

The Trapezoidal or arched shape can reach down to the lower edge be formed of the channel.

to increase The stiffness can be in the trapezoidal or bow-like area a bead be incorporated or the actuator has at the bottom of a (counter-shaped) bearing surface.

Of the Switch can be opener or closer formed be. When as an opener designed switch penetrate the contact plates each other, wherein the contact by the action of a slider on a contact spring is separable. When designed as normally open Switches do not penetrate the contact plates, in which case the Contact can be closed by the action of a slide on a contact spring.

The not operated by the slider Contact plate is designed as a fixed contact, due to the Clamping force of the slider operated Contact plate, which is designed as a contact spring, in the unactuated state the two tongues independently be bent elastically. The space required for this is in the housing interior intended. As a result of the deflection of the contact tongues arises at the touch points both When opening as well as when closing the contact a contact friction. This leads to a certain self-cleaning in the contact area, which is beneficial to the switching reliability of the switch. The opening or close the contact is made by the action of the slider on the contact spring. This is done in such a way that the trapezoidal or arcuate actuators in a side of the housing interior arranged channel protrudes.

Opening or Shut down the contact is made by the slide by this when plugging the belt tongue is moved into the belt buckle. The slider hits the actuator the contact spring. Moving further, the actuator will move in the direction moved the contact space and caused the switching.

Reference to an embodiment, the invention will be explained in more detail. The Associated 1 shows the switch according to the invention. The 2 shows a three-dimensional representation of the contact elements of the switch.

The switch, which is designed as an opener, consists of the switch housing 1 , by means of a lid, not shown here above the terminal compartment 5 is closed.

The switch has a largely closed housing interior 2a on, in which the contact is made. In the lower part of the switch is a terminal compartment 5 intended. In this end the connections 11 of the fixed contact 6 and the contact spring 7 , These can be connected to the connection lines here. The connection room 5 is open on both sides.

The contact spring 7 has an actuator 9 up, down to the canal 3 protrudes and penetrates the normally closed contact at the normally closed switch 6 , This is the fixed contact 6 in the upper area in two contact tongues 12 divided up. The contact spring 7 is about the clamping point 10 in their position to the fixed contact 6 fixed.

The tongues 12 of the fixed contact 6 are in the contacted state under a bending stress and are therefore elastically bent. They move when the contact spring is actuated 7 back to the unbent state. This creates a contact friction in the contact area. This also occurs when closing the contact, when during the upward movement of the slider 4 the contact spring 7 springs back into the unactuated state.

The operation of the switch takes place when inserting the belt tongue in the buckle, by the lower part of the belt tongue on the slide 4 interacts and this within the channel 3 shifts. The lower edge of the slider 4 presses on the actuator 9 and the contact spring 7 becomes with its rectangular area of the fixed contact plate 6 lifted. The contact is disconnected and the switch signals the proper locking of the belt tongue in the buckle.

1

switch housing

2

Housing interior

2a

upper Housing interior

3

channel

4

pusher

5

connecting space

6

Fixed contact element

7

contact spring

8th

contact surface

9

Actuator with trapezoidal or bow-type operating area

10

clamping

11

connections

12

contact tongues

13

contact area

Claims (5)

Switch for a buckle of restraint systems in motor vehicles to indicate that the belt tongue is inserted into the buckle and properly locked, with two contact plates, wherein the contact areas of the contact plates in a protected from foreign material upper housing interior ( 2a ) of the switch housing ( 1 ) are provided, characterized in that a contact plate as a contact spring ( 7 ) with a trapezoidal or bow-type actuating area ( 9 ) is formed and this actuator of the contact spring ( 7 ) in a side of the housing interior ( 2 ) channel ( 3 ) and the contacts by moving a slider ( 4 ) are switchable in the channel. Switch according to Claim 1, characterized in that the trapezoidal or arcuate actuating region ( 9 ) near the contact area of the contact spring ( 7 ) begins and in the direction of clamping point ( 10 ) or in the lower part of the channel ( 3 ) rests resiliently against the housing. Switch according to Claims 1 and 2, characterized in that the actuator ( 9 ) to the lower edge of the channel ( 3 ) is trained. Switch according to Claims 1 to 3, characterized in that in order to increase the rigidity of the actuating region ( 9 ) a bead is incorporated. Switch according to Claims 1 to 3, characterized in that at the lower end of the actuator ( 9 ) A support surface is arranged.