Belt buckle for a vehicle safety belt

Abstract

A belt buckle for a vehicle safety belt, comprising a housing (3) which is formed by at least two housing shells (1,2) joined together and in which a locking mechanism (4) is arranged, and a pushbutton (22), provided on said housing, for operating the locking mechanism (4), wherein at least two housing shells (1,2) are joined together at their shell rims and that elongated cover strips (8,9) made of solid material and covering the mutually abutting rims (17,18) of the housing shells (1,2) are fixed to the joined housing shells (1,2).

Claims

1. A belt buckle for a vehicle safety belt, comprising: a housing (3) which is formed by at least two housing shells (1,2) joined together, a locking mechanism (4) arranged in said housing, and a pushbutton (22) provided on said housing for operating the locking mechanism (4), wherein the at least two housing shells (1,2) are joined together at mutually abutting shell rims, and wherein elongated cover strips (8,9) are fixed to the joined housing shells (1,2), said elongated cover strips are formed of solid material and cover the mutually abutting shell rims (17,18) of the housing shells (1,2).

2. The belt buckle according to claim 1, wherein the elongated cover strips (8,9) are adapted to secure the housing shells (1,2) to each other.

3. The belt buckle according to claim 1, wherein said engaging members (6,7) overlap in their engaged position, and wherein said engaging members (6,7) are adapted for a predefined movement which is substantially parallel to the mutually abutting shell rims (17,18) of the housing shells (1,2), in order to join the housing shells (1,2) to each other.

4. The belt buckle according to claim 1, wherein said engaging members (6,7) comprise stop faces (10,11), wherein said stop faces prevent a sliding movement transverse to said predefined movement during joining said at least two housing shells (1,2) to each other.

5. The belt buckle according to claim 1 comprising at least one first securing member (12) provided on an inner surface of the respective cover strips (8,9) which faces the joined housing shells, and wherein said first securing member is in engagement with at least one corresponding second securing member (13) formed on said joined housing shells (1,2).

6. The belt buckle according to claim 1, wherein said elongated cover strips (8,9) are fixed to a ring (14) which is arranged about said housing shells (1,2) joined to each other.

7. The belt buckle according to claim 6, wherein said ring (14) and said cover strips (8,9) are formed of a one-piece construction.

8. The belt buckle according to claim 1, wherein said cover strips (8,9) are formed as clamp members.

9. The belt buckle according to claim 1, wherein the cover strips (8,9) are formed of metal or plastic material.

10. The belt buckle according to claim 1 wherein said at least two housing shells (1,2) each comprise a surface covering (15,16), wherein edges of said surface coverings (15,16) are covered by said cover strips (8,9).

11. The belt buckle according to claim 10, wherein said surface coverings (15,16) are made of a material, which is different from that of the housing shells.

12. The belt buckle according to claim 11, wherein the material said surface coverings are made of is at least one of the group of materials comprising: leather, imitation leather, plastic, textile fabric, carbon fibre fabric, metal.

13. The belt buckle according to claim 10, wherein said surface coverings (15,16) are in the form of a coating.

14. The belt buckle according to claim 10, wherein said surface coverings (15,16) are in the form of second cover shells (19,20).

15. The belt buckle according to claim 10, wherein said surface coverings (15,16) consist of a sound-absorbing material.

16. The belt buckle according to claim 10, wherein a sound-absorbing structured surface is provided on an outer surface of at least one of said surface coverings (15,16).

17. The belt buckle according to claim 1, wherein said pushbutton (22) has a surface covering (38) made of a material, which is different from that of the housing shells, is selected from the group of materials comprising: leather, imitation leather, plastic, textile fabric, carbon fibre fabric, metal, sound-absorbing material; or comprise a sound-absorbing structured surface.

18. The belt buckle according to claim 1, wherein a portion of said pushbutton which is located adjacent to an insertion opening (24) for a belt tongue (26) attached to a safety belt (25), has a harder surface than a surface covering (38) which is disposed on a portion of said pushbutton onto which pressure can be manually applied.

19. The belt buckle according to claim 18, wherein said harder surface of said portion of said pushbutton having said harder surface is formed by post-curing the material of the surface covering (38).

20. The belt buckle according to claim 18, wherein said harder surface is formed by applying a hardening coating to the surface covering (38).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The invention shall now be described with reference to embodiments shown in the attached Figures, in which:

(2) FIG. 1 shows a perspective view of a belt buckle;

(3) FIG. 2 shows a plan view of the embodiment shown in FIG. 1;

(4) FIG. 3(A-C) shows, in perspective views, various embodiments for a pushbutton that can be used in the belt buckle of FIG. 1;

(5) FIG. 4 shows, in a perspective exploded view, components that may be used to form the housing of the belt buckle;

(6) FIG. 5 shows, in a perspective view, another embodiment for two housing shells forming the housing of the belt buckle;

(7) FIG. 6 shows, in a cutaway view, engaging members that engage each other to join two housing shells together;

(8) FIG. 7 shows, in a cutaway view, the edges of the two housing shells in FIG. 5 that are slid over each other;

(9) FIG. 8 shows a cross-sectional view through the pushbutton of the belt buckle shown in FIG. 1, along line A-A;

(10) FIG. 9 shows a cross-sectional view along line B-B in FIG. 1;

(11) FIG. 10 shows a cross-sectional view along line C-C in FIG. 1;

(12) FIG. 11 shows a partially cutaway view of an embodiment of cover strips provided on a ring;

(13) FIG. 12 shows, in a partially cutaway view, a housing of the belt buckle with an illumination device arranged inside the housing;

(14) FIG. 13 shows an electrical circuit diagram for the power supply of the illumination device arranged inside the housing;

(15) FIGS. 14A, B shows a plan view of the pushbutton, with a border around the housing with illumination switched on and off

DETAILED DESCRIPTION

(16) The embodiments of a belt buckle for a vehicle safety belt, as shown in the Figures, include a housing 3 in which a locking mechanism 4 (FIG. 12) is arranged. A pushbutton 22 provided on housing 3 is used to operate locking mechanism 4. By means of locking mechanism 4, it is possible to lock in place a belt tongue 26 which is connected to a safety belt 25 and which can be inserted into an insertion opening 24. The belt tongue is locked automatically into place when it is inserted into locking mechanism 4. To release the lock, pressure is applied externally and manually to pushbutton 22. After being released from the locked state, belt tongue 26 is then ejected from the locking mechanism.

(17) In the embodiments shown, housing 3 may be formed by two housing shells 1 and 2. At their shell rims 5, housing shells 1 and 2 have engaging members 6 and 7 which can be brought into engagement with each other by sliding them against each other when rims 17, 18 of the housing shells abut each other. In the embodiments shown, this sliding movement is performed parallel to abutting rims 17 and 18.

(18) Engaging members 6 and 7 may be embodied in such a way that they overlap in their engaged position, as shown in FIG. 6. The mutually engaging members 6, 7 may have stop faces 10, 11 abutting each other, which prevent a sliding movement transverse to the connecting movement. As shown in FIG. 5, engaging members 6 and 7 may extend substantially along the entire abutting rims of housing shells 1 and 2. However, it is also possible that engaging members 6 and 7 extend only partly along the length of abutting rims 17 and 18 of housing shells 1 and 2, as shown in FIG. 4.

(19) The two housing shells 1 and 2 are joined to each other by engagement of engaging members 6 and 7, preferably in an overlapping arrangement as shown in FIG. 6. To prevent the joined housing shells 1 and 2 from being disconnected, elongated cover strips 8 and 9 made of solid material are provided which cover the mutually abutting rims 17 and 18 of housing shells 1 and 2. These elongated cover strips 8 and 9 may have securing members 12 disposed on their respective inner surfaces facing the joined housing shells 1 and 2, which engage in corresponding securing members 13 formed on the joined housing shells 1 and 2.

(20) In the embodiment shown in FIG. 4, inwardly extending projections forming securing members 12 are provided on cover strips 8 and 9. Corresponding recesses are provided in the region of rims 17 and 18 on the abutting housing shells 1 and 2 and form the corresponding securing members 13 into which the projections provided on the cover strips extend. This ensures that when housing shells 1 and 2 are in the assembled state, they can no longer move relative to each other, so a secure join is produced to form housing 3.

(21) This secure join can also be achieved by embodying cover strips 8 and 9 as clamp members. Their free ends may be embodied as clamp ends 36, as shown in FIG. 11, which prevent any disconnecting movement of the joined housing shells 1 and 2. For that purpose, clamp ends 36 of cover strips 8 and 9 are placed around the joined housing shells 1 and 2, as illustrated in FIG. 11. The joined housing shells 1 and 2 are gripped in the region where their rims abut, in particular in the region of their inwardly facing rim portions 37, as shown in FIG. 4.

(22) Such securing of the joined housing shells 1 and 2 against any disconnecting movement is preferably used in housing shells 1 and 2, as shown in FIG. 7. In this embodiment, engaging members 6 and 7 extend substantially along the entire abutting rims.

(23) As can be seen from FIG. 4, however, it is also possible to provide both kinds of securing, namely clamp ends 36, and the securing members 12 which are provided on the inner surface of cover strips 8 and 9 and which engage corresponding securing members 13 of the joined housing shells 1 and 2.

(24) In order to secure the elongated cover strips 8 and 9 in place, they may be attached to a ring 14. Ring 14 and cover strips 8 and 9 are preferably of one-piece construction. Cover strips 8 and 9 may be provided on ring 14 so that clamp ends 36 come into springy engagement with the inwardly facing rim portions 37 of housing shells 1 and 2. The other ends of cover strips 8 and 9 are preferably joined integrally to ring 14. Ring 14 and cover strips 8 and 9 are preferably of metal. However, they may also consist of a suitable plastic, for example a fibre-reinforced plastic. Attachment to the joined housing shells 1 and 2 is achieved by ring 14 being pushed with a close fit over the housing portion adjacent to pushbutton 22, as can be seen from FIG. 1. Clamp ends 36 grip around the inwardly facing rim portions 37 of joined housing shells 1 and 2 with springy and/or clamping engagement. FIG. 7 shows in cross-section how the rims 43 and 44 of housing shells 1 and 2 in FIG. 5 are slid over each other.

(25) The two housing shells 1 and 2 may have a surface covering (15, 16). These surface coverings 15, 16 are preferably in the form of shaped bodies, in particular in the form of cover shells 19, 20, as shown in FIG. 4. However, surface coverings 15, 16 may also be embodied in the form of coating, an overlay, or the like. Surface coverings 15 and 16 consist of a different material from that of the housing shells, in particular of a decorative material. Suitable decorative materials include, for example, natural leather, imitation leather, textile fabrics, or fabrics made of plastic fibres, carbon fibres, metal fibres and the like.

(26) Surface coverings 15 and 16 consisting of a sound-absorbing material are preferably used. Suitable such materials include leather, imitation leather, textile fabrics and other fabrics. Sound-absorbing embossments (not shown in further detail) may preferably be provided on the outer side of surface coverings 15, 16. With these embossments, the outer sides of surface coverings 15, 16 lie against vehicle components such as seat components or the centre console.

(27) As can be seen from FIG. 10, the abutting rims 17, 18 of the two joined housing shells 1 and 2, and the rims of surface coverings 15 and 16 are covered by cover strips 8 and 9. As FIG. 4 shows, ring 14 covers the upper rim of the shorter housing shell (bottom housing shell) 1 and the upper rim of surface coverings 15 and 16. Ring 14 also surrounds the ring-shaped upper portion of upper housing shell 2 in which a recess is formed. Pushbutton 22 is disposed in the latter recess. The two housing shells 1 and 2 are joined fixedly to each other by that means also.

(28) Pushbutton 22 may also have a surface covering 38. This surface covering may likewise consist of a decorative material. This decorative material may be the same as the material of surface coverings 15 and 16 for housing shells 1 and 2. However, it may also be a material different from the latter. Examples of materials used for surface covering 38 include leather, imitation leather, or a plastic material that feels on the surface like leather. If substantially the entire surface of pushbutton 22 is fitted with surface covering 38, it is advantageous to provide a pushbutton portion 23 which is adjacent to insertion opening 24 and also, more particularly, to provide a slanting pushbutton portion 42 opposite the remaining pushbutton portion with a hardened surface. That portion of surface covering 38 may be treated by post-curing to achieve that purpose. A hardening overlay of plastic, for example, or a coating of paint or varnish, or a hardening impregnation of the material of surface covering 38 are suitable in this regard.

(29) However, it is also possible to provide surface covering 38 in a recess in the pushbutton surface (FIG. 8), if necessary, in the portion to which pressure is manually applied when the pushbutton is operated. The remainder of the pushbutton, in particular the pushbutton portion 23 adjacent to insertion opening 24 (FIGS. 3A and B) and if necessary the sloping pushbutton portion 42 (FIG. 3C), then has the plastic material of which the pushbutton consists.

(30) FIG. 12 shows an embodiment of a belt buckle, in which an illumination device in the form of at least one luminous element 27 is provided inside the housing. The illumination device 29 inside the housing, in particular the at least one luminous element 27, is adapted to illuminate at least one interior portion 32 immediately adjacent to pushbutton 22 (the underside of the pushbutton) inside housing 3. A translucent gap 30 is formed between the opaque pushbutton 22 and the opaque rim 31 surrounding the housing recess in which pushbutton 22 is disposed. As can be seen from FIGS. 4 and 12, the ring-shaped rim portion 31 is integrally joined to housing shell 2, which together with the other housing shell 1 encloses the inside of the housing. As already mentioned, the ring-shaped rim portion 31 surrounds pushbutton 22 and consists, like the entire housing 3, of opaque material.

(31) The light emitted from the inside of the housing escapes to the outside through the gap 30 formed between pushbutton 22 and the ring-shaped rim portion 31. In this way, the surface of the pushbutton and in particular its lateral borders are made visually discernible, thus allowing the position of the pushbutton in the vehicle to be seen even when visibility inside the vehicle is poor. More particularly, the translucent gap 30 is present at the pushbutton edges forming a pushbutton portion 34 to which pressure is manually applied (FIG. 2).

(32) Illumination device 29, in particular the at least one luminous element 27, may also be adapted and arranged in such a way that the insertion opening 24 is likewise illuminated when the belt tongue 26 has been removed from the belt buckle. A perimeter region 35 of insertion opening 24 may be illuminated by a fibre optic (not shown), for example.

(33) The at least one luminous element 27 is preferably integrated in a sensor device 28 or switch for detecting the lock state of locking mechanism 4. Luminous element 27 is disposed, more particularly, in the housing of said sensor device 28. Such a sensor device is known from Such an airbag arrangement is known from U.S. Pat. No. 5,960,523, for example.

(34) The at least one luminous element 27 is preferably switched on by a switch 41 (FIG. 13) being closed when at least one of the vehicle doors is opened and before the vehicle engine is started. However, the at least one luminous element 27 may also be switched on by a switching function that is performed between the latter two actions.

(35) It is preferable that the at least one luminous element also remains switched on when belt tongue 26 is locked in place in locking mechanism 4. In this way, the position of pushbutton 22 and in particular the opaque portion of the pushbutton portion 34 to which pressure is manually applied in order to operate the pushbutton is made visually discernible.

(36) FIG. 13 shows a circuit for supplying power to the luminous element 27 embodied as an LED. Luminous element 27 is supplied with power from a power supply source 39 via a series resistor 40 when switch 41 is closed. As already explained, switch 41 is closed when at least one vehicle door is opened, but it can also be closed by some other switching function between the door being opened and the engine of the vehicle being started. The power is supplied via a cable 45 (FIG. 12).

(37) FIG. 14 shows, in a plan view onto the belt buckle, the states in which belt tongue 26 has been removed from the belt buckle (FIG. 14A) and in which belt tongue 26 has been inserted into insertion slot 24 and locked into locking mechanism 4 (FIG. 14B). The illumination for indicating insertion slot 24 and gap 30 is switched between these two states. When the belt tongue has been removed (FIG. 14A), a perimeter region 46, which may be triangular in shape with a point pointing towards insertion slot 24, is illuminated. This may be achieved by a respective luminous element, for example an LED, illuminating perimeter region 46 via a fibre optic. When belt tongue 26 has been inserted into insertion slot 24 and locked into locking mechanism 4 (FIG. 14B), the gap 30 between rim 31 on the housing and pushbutton 22 is illuminated. This may be achieved by switching on a luminous element assigned to gap 30, in particular an LED, in order to illuminate the gap.

(38) With the aid of a luminous element, for example luminous element 27, which works together with a fibre optic coupler (not shown in further detail), it is also possible to switch on the illumination of perimeter region 46 when the belt tongue has been removed and the illumination of gap 30 when belt tongue 26 has been locked into the belt buckle. Such illumination is possible with the aid of the fibre optic coupler, which has a respective switching function. The illuminated states are shown by hatching in views (A) and (B) in FIG. 14.

(39) However, it is also possible to illuminate the perimeter region 46 and gap 30 simultaneously with the aid of illumination device 29, such that gap 30 is also illuminated when belt tongue 26 has been removed from the belt buckle. When belt tongue 26 is inserted in the belt buckle, the illuminated perimeter region 46 is then covered by belt tongue 26 and by safety belt 25 attached thereto.

(40) When fibre optics are used, they may preferably be moulded or injected or clipped into one or into both housing shells 1,2. A suitable plastic material, for example polymethylmetacrylate or polycarbonate, may be used for the fibre optics.

LIST OF REFERENCE SIGNS

(41) 1,2 Housing shells 3 Housing 4 Locking mechanism 5 Shell perimeters 6,7 Engaging members 8,9 Cover strips 10,11 Stop faces 12,13 Securing members 14 Ring 15,16 Surface coverings 17,18 Rims 19,20 Cover shells 21 Embossments 22 Pushbutton 23 Pushbutton portion 24 Insertion opening 25 Safety belt 26 Belt tongue 27 Luminous element 28 Sensor device 29 Illumination device 30 Gap 31 Rim 32 Interior portion 33 Switching device 34 Pushbutton portion 35 Perimeter region 36 Clamp ends 37 Inwardly facing rim portions 38 Surface covering 39 Power supply source 40 Series resistor 41 Switch 42 Sloping pushbutton portion 43,44 Edges 45 Cable 46 Illuminable perimeter region