WO2015132288A1

WO2015132288A1 - Spring-secured fastening device for a safety belt fitting

Info

Publication number: WO2015132288A1
Application number: PCT/EP2015/054475
Authority: WO
Inventors: Topoc BOGDAN
Original assignee: Autoliv Development Ab
Priority date: 2014-03-04
Filing date: 2015-03-04
Publication date: 2015-09-11
Also published as: DE102014102856B3

Abstract

A fastening device for a safety belt fitting (20 ) with a bolt(11) arranged on the vehicle side and having a widened bolt head (12) sitting on a bolt shaft (13), and with a keyhole- shaped fitting opening (22) formed on the safety belt fitting (20), which opening, on assembly, is able to be placed with a larger cross-sectional area (23) over the bolt head (12), so that with a subsequent moving of the safety belt fitting (20) into its fastening position, the bolt shaft (13) enters into an oblong hole-like cross-sectional area (24) of the keyhole shaped fitting opening (22) is characterized in that the otherwise round bolt shaft (13) of the bolt (11) is provided on one side of its cross-section with a chord-like flattening (29), and that the oblong hole-like cross-sectional area (23) of the keyhole-shaped fitting opening (22) has a partial section (35) with a width corresponding to the cross- sectional area of the bolt shaft (13) and a receiving opening (32), adjoining the oblong hole-like cross-sectional area (24) for the round remaining cross-section of the bolt shaft (13) whereas the safety belt fitting (20), which position in its mounting position is rotated with respect to the fastening position, is able to be guided through the oblong hole-like cross-sectional area (24) and is able, after entry of the bolt (11) into the receiving opening (32), to be rotated into the fastening position.

Description

SPRING-SECURED FASTENING DEVICE FOR A SAFETY BELT FITTING

DESCRIPTION

The invention relates to a fastening device for a safety belt fitting with a bolt arranged on the vehicle side and having a widened bolt head sitting on a bolt shaft, and with a keyhole-shaped fitting opening formed on the safety belt fitting, which opening, on assembly, is able to be placed with a larger cross-sectional area over the bolt head, so that with a subsequent moving of the safety belt fitting into its fastening position, the bolt shaft enters into an oblong hole-like cross-sectional area of the keyhole-shaped fitting opening, wherein on the safety belt fitting a spring plate is fastened, overlapping the respectively greatest part both of the larger cross- sectional area and also of the oblong hole-like cross- sectional area of the fitting opening, which spring plate, with a locking nose arranged on its underside and projecting with respect to the fitting, secures in the oblong hole-like cross-sectional area the bolt head which is displaced from the larger cross-sectional area onto the end of the oblong hole-like cross-sectional area.

A fastening device having the above-mentioned features is described in DE 199 58 745 C1. The assembly of the known fastening device takes place such that the safety belt fitting provided with the keyhole-shaped fitting opening is mounted with the larger cross-sectional area of its fitting opening onto the bolt head of the bolt, wherein the bolt head can enter into a space arranged between the spring plate and the fitting via a step formed in this region on the spring plate, so that during the mounting a spring effect of the spring plate with respect to the bolt does not occur. For further assembly, the safety belt fitting is moved in its plane with respect to the bolt such that the bolt shaft of the bolt enters into the oblong hole-like cross-sectional area of the fitting opening. On this movement, the bolt head raises the locking nose situated on the spring plate until the fastening position of the bolt shaft is reached at the end of the oblong hole-like cross- sectional area, in which position the locking nose snaps behind the bolt head and thus prevents a movement of the bolt shaft back in the direction of the larger cross- sectional area of the fitting opening.

Such a fastening device in addition involves the disadvantage that with a corresponding application of force in the direction of movement of the fastening fitting on the bolt a bending or breaking of the locking nose, formed out from the spring plate, and hence a loosening of the safety belt fitting from the bolt can not be completely ruled out.

The invention is therefore based on the problem of improving a fastening arrangement of the generic type named in the introduction, such that with the safety belt fitting mounted on the bolt in the fastening position, a movement of the safety belt fitting back with respect to the bolt is also ruled out in the case of a greater application of force.

The solution to this problem, including advantageous embodiments and further developments of the invention will emerge from the content of the claims which follow this description.

For this, the invention provides in detail a fastening device of the type named in the introduction, in which the otherwise round bolt shaft of the bolt is provided on one side of its cross-section with a chord-like flattening, and wherein the oblong hole-like cross-sectional area of the keyhole-shaped fitting opening has a partial section with a width corresponding at least to the distance, formed on the bolt shaft, between the flattening and the opposite peripheral surface, and a receiving opening, adjoining at its end lying opposite the larger cross-sectional area onto the oblong hole-like cross-sectional area, embodied with a radius, for the round remaining cross-section of the bolt shaft, and the width of the partial section is smaller than the diameter of the receiving opening, such that the bolt shaft, in a mounting position of the safety belt fitting, which position is rotated with respect to the fastening position, is able to be guided through the partial section of the oblong hole-like cross-sectional area of the fitting opening, and the safety belt fitting, after entry of the bolt into the receiving opening, is able to be rotated into the fastening position.

Owing to the configuration of the bolt shaft according to the invention on the one hand, and the fitting opening formed on the safety belt fitting on the other hand, the safety belt fitting is to be brought, for assembly, into an assembly position which is rotated with respect to its fastening position, in which assembly position the flattening, which is formed on the bolt shaft, is aligned approximately parallel to one of the outer walls situated in a partial region of the oblong hole-like cross-sectional area of the fitting opening, so that in this assembly position the safety belt fitting can be moved on the bolt. When at the end of the displacement path the bolt has entered into the receiving opening which is formed at the end of the oblong hole-like cross-sectional area of the fitting opening, then the safety belt fitting can be rotated back with its receiving opening into its fastening position, wherein the peripheral area of the receiving opening, provided with a corresponding radius, surrounds the peripheral area of the bolt shaft outside its flattening. As the width of the oblong hole-like cross- sectional area is smaller than the diameter of the receiving opening, the bolt shaft rests in the transition region of its round peripheral area to the flattening at the transition of the receiving opening to the narrower partial section of the oblong hole-like cross-sectional area, so that at this point a complete transmission is possible of the forces occurring in the course direction of the keyhole-like fitting opening. In so far as, furthermore, a movement of the safety belt fitting back in the displacement direction is ruled out by the locking nose which is formed on the spring plate, a secure and load- bearing fixing is present of the safety belt fitting on the bolt.

According to an example embodiment of the invention, provision can be made that an L-shaped washer, having an L- arm projecting freely in the direction of the safety belt fitting which is to be placed onto the bolt, is secured in a form-fitting manner on the bolt shaft, which washer serves as anti-twist protection for the safety belt fitting which is situated on the bolt in the fastening position.

In the drawings an example embodiment of the invention is presented, which is described below. There are shown:

Fig. 1: a part, fixed to the vehicle, with bolt mounted thereon for fastening a safety belt fitting.

Fig. 2: the safety belt fitting belonging to Fig. 1 in a front view.

Fig. 3: the safety belt fitting according to Fig. 2 in side view.

Fig. 4: the bolt, situated on the part fixed to the vehicle, in a perspective illustration.

Fig. 5: the safety belt fitting with bolt in the assembly position at the start of the assembly. Fig. 6 : the subject matter of Fig. 5 in an advanced assembly position.

Fig. 7 : the subject matter of Fig. 5 or respectively 6 at the end of the assembly,

Fig. 8: the safety belt fitting situated on the bolt, in its fastening position.

As can be seen firstly from Fig. 1, a bolt 11 , for fastening a safety belt fitting, which is not yet illustrated in Fig. 1, is securely anchored on a part 10 , fixed to the vehicle, of a motor vehicle which is not illustrated further. The bolt 11 has a widened bolt head 12 sitting on a bolt shaft 13 . In addition, a washer 14 with an L-arm 15 projecting freely therefrom is arranged on the bolt, which L-arm in turn has an elbow 16 extending approximately parallel to the bolt shaft 13 .

The safety belt fitting 20, to be secured on the bolt 11 of the part 10 which is fixed to the vehicle can be seen from Fig. 2 and 3 . This safety belt fitting 20 has at its associated end a belt guide slot 21 for the guiding through of a safety belt webbing which is not further illustrated. For its fastening on the bolt 11 , the safety belt fitting 20 has a keyhole-shaped fitting opening 22 , which has a larger, preferably round, cross-sectional area 23 and an oblong hole-like cross-sectional area 24 proceeding therefrom. On the safety belt fitting 10 , a spring plate

25 , aligned substantially parallel to its plane, is fastened, in the present case by means of fastening rivets

26 , which are arranged in the region of the safety belt fitting 20 between the belt guide slot 21 and the larger cross-sectional area 23 of the fitting opening 22 . As can be seen from Fig. 3 in this respect, the spring plate 25 is provided, adjoining its fastening section, with an offset step 27 , so that in the region of the spring plate 25 overlapping the larger cross-sectional area 23 of the fitting opening 22 a space is arranged with respect to the safety belt fitting 20, the dimension of which corresponds approximately to the height of the bolt head 12 of the bolt 11. In the region of the offset step 27 a hole 40 is arranged within the spring plate 25, the characteristics of the spring plate 25 being improved thereby. The recesses 41 formed adjacent to a (lower) edge only form a production- related "Poka Yoke"-feature in order to avoid a mistake of the parts during production.

The spring plate 25 lies with a leg against the safety belt fitting 20 in the area overlapping the oblong hole-like cross-sectional area 24 of the fitting opening 22, wherein in this region a locking nose 28, projecting in the direction of the safety belt fitting 20, is bent out by punching, so that a punched cutout 37 is produced in the region of the spring plate 25 with respect hereto.

The structure in this respect, in particular of the safety belt fitting 20, is known from the generic DE 199 58 745 CI, the disclosure of which is referred to in full.

As can be seen from Fig. 4, the bolt shaft 13 of the bolt 11, which is otherwise round, is provided on one side of its cross-section with a chord-like flattening 29. Lying opposite this flattening 29 is a peripheral surface 30 adjoining the bolt head 12. With an identical configuration, a bearing region 31 to receive the washer 14 is formed adjoining the peripheral surface 30 in the axial direction.

As can be seen from Fig. 5 to 8, which show the sequence of the assembly of the safety belt fitting 20 on the bolt 11, the oblong hole-like cross-sectional area 24 of the keyhole-shaped fitting opening 22 has a partial section 35, adjoining the larger cross-sectional area 23 of the fitting opening 22, the width of which partial section, formed between its opposite walls 34, corresponds to the distance, formed on the bolt shaft 13 of the bolt 11, between its flattening 29 and the opposite peripheral surface 30. Adjoining said partial section 35, lying opposite the larger cross-sectional area 23 of the fitting opening 22, is a receiving opening 32 embodied with a radius, wherein the width of the partial section 35 is smaller than the diameter of the receiving opening 32, so that transitions 33 are produced respectively between the wall of the receiving opening 32 and the walls 34 of the partial section 35.

As can be seen firstly from Fig. 5, in a first assembly step the safety belt fitting 20 is pushed with the larger cross-sectional area 23 of its keyhole-shaped fitting opening over the bolt head 12, wherein in Fig. 5 to 8 respectively only the position of the bolt shaft 13 in relation to the fitting opening 22 is indicated. In this respect, in the first assembly step illustrated in Fig. 5, the bolt shaft 13 lies with its imaginary centre point in the centre point of the larger cross-sectional area 23 of the fitting opening 22. Here, the safety belt fitting 20 is pushed in such a position over the bolt 11 with bolt head 12 that the flattening 29, formed on the bolt 11, is aligned parallel to the upper wall 34, in the illustrated example embodiment, of the partial section 35, in this respect, of the oblong hole-like cross-sectional area 24 of the fitting opening 22.

As can be seen furthermore from Fig. 6 and 7, in this alignment of the safety belt fitting 20 movement is carried out on the bolt shaft 13 such that the bolt shaft 13 is firstly guided through the partial section 35 of the oblong hole-like cross-sectional area 24, until the bolt shaft 13 has entered into the receiving opening 32 adjoining the partial section 35 (Fig. 7). In this position, the fastening fitting 20 is pivoted anticlockwise on the bolt shaft 13 approximately through 90 degrees, so that the receiving opening 32, embodied with a radius, surrounds the round remaining cross-section of the bolt shaft 13. In this position, the transitions between the peripheral surface 30 and the flattening 29 of the bolt shaft 13 rest on the transitions 33 between the receiving opening 32 and the partial section 35 of the oblong hole- like cross-sectional area 24, so that hereby in addition to the locking nose 28 of the spring plate 25, a movement back of the safety belt fitting 20 with respect to the bolt 11 is also prevented in that the transitions formed on the bolt 11 between flattening 29 and peripheral surface 30 rest in a load-transmitting manner on the transitions 33 formed between receiving opening 32 and partial section 35. In this respect, the locking nose 28 formed on the spring plate 25 has an additional securing function, in particular when the safety belt fitting 20 is rotated back into its assembly position (Fig. 5 to 7) .

The features disclosed in the preceding description, in the claims, the abstract and the drawings, of the subject matter of these documents can be essential individually and also in any desired combinations with one another for the realization of the invention in its various embodiments.

Claims

CLAIMS 1. A fastening device for a safety belt fitting (20) with a bolt (11) arranged on the vehicle side and having a widened bolt head (12) sitting on a bolt shaft (13), and with a keyhole-shaped fitting opening (22) formed on the safety belt fitting (20), which opening, on assembly, is able to be placed with a larger cross- sectional area (23) over the bolt head (12), so that with a equent moving of the safety belt fitting (20) into its fastening position, the bolt shaft (13) enters into an oblong hole-like cross-sectional area

(24) of the keyhole-shaped fitting opening (22) , wherein on the safety belt fitting (20) a spring plate

(25) is fastened, overlapping the respectively greatest part both of the larger cross-sectional area (23) and also of the oblong hole-like cross-sectional area (24) of the fitting opening (22), which spring plate, with a locking nose (28) arranged on its underside and projecting with respect to the fitting (20) , secures in the oblong hole-like cross-sectional area (24) the bolt head (12) which is displaced from the larger cross-sectional area (23) onto the end of the oblong hole-like cross-sectional area (24), characterized in that the otherwise round bolt shaft (13) of the bolt (11) is provided on one side of its cross-section with a chord-like flattening (29) , and that the oblong hole-like cross-sectional area (23) of the keyhole-shaped fitting opening (22) has a partial section (35) with a width corresponding at least to the distance, formed on the bolt shaft (13), between the flattening (29) and the opposite peripheral surface (30) , and a receiving opening (32) , adjoining at its end lying opposite the larger cross-sectional area (23) onto the oblong hole-like cross-sectional area (24), embodied with a radius, for the round remaining cross-section of the bolt shaft (13), and the width of the partial section (35) is smaller than the diameter of the receiving opening (32), such that the bolt shaft (13), in a mounting position, of the safety belt fitting (20), which position is rotated with respect to the fastening position, is able- to be guided through the partial section (35) of the oblong hole-like cross-sectional area (24) of the fitting opening (22) , and the safety belt fitting (20) , after- entry of the bolt (11) into the receiving opening (32) is able to be rotated into the fastening position.

2. The fastening arrangement according to Claim 1, characterized in that an L-shaped washer (14) , having an L-arm (15) projecting freely in the direction of the safety belt fitting (20) which is to be placed onto the bolt (11) , is secured in a form-fitting manner on the bolt shaft (13), which washer serves as anti-twist protection for the safety belt fitting (20) which is situated on the bolt (11) in the fastening position.