Vehicle-sensitive sensor for a self-locking belt retractor

Abstract

The present invention relates to a vehicle-sensitive sensor for a self-locking belt retractor, comprising: a support part, a sensor mass which is disposed vertically on a contact surface of the support part and can tilt relative to the support part and a locking lever which is coupled to the sensor mass and has an engagement tip, wherein the locking lever has at least two rotation elements for forming an axis of rotation for the locking lever, and wherein each rotation element rests on an associated contact point of the support part.

Claims

1. A vehicle-sensitive sensor for a self-locking belt retractor, comprising: a support part, a sensor mass which is disposed vertically on a contact surface of the support part and can tilt relative to the support part and a locking lever which is coupled to the sensor mass and has an engagement tip, wherein the locking lever has at least two rotation elements for forming an axis of rotation for the locking lever, and wherein each rotation element rests on an associated contact point of the support part, wherein the support part has a recess for each rotation element with each recess having a front opening by means of which the rotation element can be introduced into the recess, and wherein a base of the recess forms a contact point, wherein the base is covered by a cover of the respective recess and each opening narrows towards the base of the recess.

2. The sensor according to claim 1, wherein the cover of the recess has a downwardly projecting projection which limits a rotational movement of the rotation element.

3. The sensor according to claim 1, wherein the narrowing of the opening towards the base of the recess comprises a tapering of the opening to the bottom of the base, such that a transition from the tapering opening to the bottom of the recess is disposed behind the projection in an introduction direction of the rotation element.

4. The sensor according to claim 1, wherein a forwardly projecting stop element is assigned to each recess which limits a rotational movement of the locking lever.

5. The sensor according to claim 4, wherein the locking lever has protrusions which are assigned to the stop elements in connection sections between the rotation elements and the engagement tip.

6. The sensor according to claim 1, wherein each rotation element has an asymmetric curvature on its underside starting from a minimum defined by a normal position.

7. The sensor according to claim 1, wherein the rotation elements have an oval outer circumferential shape.

8. A belt retractor having the sensor according to claim 1.

Description

(1) The invention and the technical environment are explained below by way of example with reference to the figures. The following are shown schematically:

(2) FIG. 1: a perspective view of a vehicle-sensitive sensor,

(3) FIG. 2: an exploded view of the sensor,

(4) FIG. 3: a side view of a support part of the sensor,

(5) FIG. 4: a side view of a locking lever of the sensor,

(6) FIG. 5 a side view of the sensor in a normal position,

(7) FIG. 6: the side view with a rotated locking lever,

(8) FIG. 7: a sectional view through the support part and the locking lever in the rotated state,

(9) FIG. 8: a detail view of FIG. 7,

(10) FIG. 9: a detail view of the side view of the sensor in the normal position, and

(11) FIG. 10: the detail view according to FIG. 9 with a rotated locking lever.

(12) The vehicle-sensitive sensor shown in the figures comprises a support part 1, a sensor mass 2 and a locking lever 3.

(13) The support part 1 comprises a contact surface 1.1 (see FIG. 2) on which the sensor mass 2 stands and to which the sensor mass 2 is arranged to tilt.

(14) The locking lever 3 comprises an engagement tip 3.1 and a section on the side opposite the engagement tip 3.1, which section extends through the sensor mass 2 (see FIG. 1) in the assembled state. At its lateral edges, the locking lever 3 comprises rotation elements 3.2a and 3.2b. In addition, the locking lever comprises protrusions 3.3a and 3.3b on its underside adjacent to the rotation elements 3.2a and 3.2b.

(15) The support part 1 has recesses 1.3a and 1.3b in its lateral regions, each of which forms a contact point 1.2a and 1.2b for the rotation elements 3.2a and 3.2b of the locking lever 3 with their base. As can be seen in particular from FIG. 3, the recess 1.3a has, in addition to the base 1.3a.i, a cover 1.3a.ii which covers the base 1.3a.i. The recess 1.3a also has an opening 1.3a.iii in its front side. The opening 1.3a.iii is designed such that it tapers from the front side to the recess 1.3a. In addition, the recess 1.3a has a downwardly projecting projection 1.3a.iv on its cover 1.3a.ii.

(16) Two stop elements 1.4 a and 1.4b are also disposed on the front side of the support part 1 and are disposed on the front side offset inward with respect to the recesses 1.3a and 1.3b.

(17) The opening 1.3a.iii and the projection 1.3a.iv are designed such that the associated rotation element 3.2a of the locking lever 3 can only be inserted into the recess 1.3 in a certain orientation. The locking lever 3 is then oriented such that it is located in the normal position shown in FIG. 5. It can also be seen from FIG. 5 that the locking lever 3 cannot pass out of the recess 1.3a by a simple linear movement to the front side (i.e., to the right in FIG. 5), since it would abut against the projection 1.3a.iv.

(18) The normal position is also shown in detail in FIG. 9. It can be seen here that the base 1.3a.i of the recess 1.3a is covered by the cover 1.3a.ii and that the projection 1.3a.iv projects downwards enough for it overlap with the rotation element 3.2a that is not circular in its outer circumferential design.

(19) FIGS. 6 and 10 show the locking lever 3 in a rotated position. It can be seen that the rotation element 3.2a comes into contact with the projection 1.3a.iv by an upper section, whereby the rotational movement of the locking lever 3 is limited. It can also be seen in FIGS. 9 and 10 that the curvature of the rotation element 3.2a in its lower section, by which the rotation element 3.2a rests on the base 1.3a.i, is asymmetrical with respect to the contact point.

(20) It is also apparent from the cross-sectional views shown in FIGS. 7 and 8 that, in the rotated position of the locking lever 3, the locking lever 3 rests by the protrusion 3.3b against the stop element 1.4b formed on the support part 1, as a result of which the rotational movement of the locking lever 3 is likewise limited.

LIST OF REFERENCE SIGNS

(21) 1 Support part 1.1 Contact surface 1.2a Support point 1.2b Support point 1.3a Recess 1.3b Recess 1.3a.i Base 1.3a.ii Cover 1.3a.iii Opening 1.3a.iv Projection 1.4a Stop element 1.4b Stop element 2 Sensor mass 3 Locking lever 3.1 Engagement tip 3.2a Rotational element 3.2b Rotational element 3.3a Protrusion 3.3b Protrusion