GB2492814A - Seatbelt assembly - Google Patents

Abstract

Seatbelt buckle assembly 307 comprises a cover or flap (350, Fig. 4) or bristles 370 arranged to keep foreign objects out of the interior of the buckle; particularly the area where a latch engages with the seatbelt tongue (200, Fig. 1) to retain the tongue. The flap or bristles may be rotatable outwardly to expel foreign objects accumulated thereon. The movement of the flap or bristles may be actuated by a press button (360, Fig. 4) or press panel 380 incorporated into the buckle assembly. The flap or bristles is/are mounted adjacent to an outer tongue insertion area (320, Fig. 3), which is adjacent to a tongue release button 310.

Description

SEATBELT BUCKLE ASSEMBLY

Field of the invention.

The invention is concerned with seatbelt assemblies for a seatbelt type restraint device for a passenger or commercial vehicle. Aspects of the invention relate to a seatbelt assembly, to a vehicle seatbelt system, and to a vehicle.

BackQround of the invention.

Most modern vehicles, such as passenger cars, intended for use on public roads are fitted with seatbelts, arranged to restrain a seated occupant during sudden changes in vehicle movement such as heavy braking; or in the event of a vehicle collision. These devices are intended to manage the movement of the occupant within the vehicle during such an event, mitigating the risk of occupant injury.

Typically, a seatbelt system comprises a length of webbing, a tongue secured to the webbing and a buckle arranged for releasable engagement with the tongue.

The two ends of the length of webbing are secured to the vehicle orto the vehicle seat, with one end rigidly secured via a mounting bracket to the vehicle body or seat and the other end commonly secured to the vehicle or seat via a spring-biased spool known as a retractor. The seatbelt buckle is typically located adjacent the pelvis of the seated occupant, on the opposite side of the occupant to the retractor and mounting bracket; and is mounted to the vehicle floor or seat by an anchor.

In use, the seated occupant pulls the tongue fixed to the webbing across their body, causing the retractor to pay out a portion of webbing stored thereon, sufficient to allow the occupant to insert the tongue into the buckle and to engage it therewith.

The result of this action causes a portion of the seatbelt webbing to lie across the lap of the occupant, and another portion of the webbing to lie diagonally across their chest. The mounting bracket, retractor and buckle provide three points of anchorage for the occupant to the vehicle and, with the webbing secured across their body, will restrain the occupant within the vehicle until the tongue is disengaged or unlatched from the buckle.

The integrity of the seatbelt system in use depends on the tongue being latched securely within the buckle. As the buckle is necessarily located adjacent to the junction between the backrest and the cushion of the seat, it is unfortunately in a position where it may collect foreign objects such as shirt buttons, loose threads from clothing, small coins, and dust particles. Although seat belt buckles are often designed with internal pathways allowing such debris to fall out of the bottom of the buckle, the tongue may be prevented from engaging with the buckle until the debris has found its way out. This situation can be irritating for the vehicle user, especially if they are prevented from using their vehicle in a safe condition. It may often be feasible for a technician to clear the blockage in a matter of moments; but this is scant consolation to the vehicle user, who has to wait for a technician to arrive and to clear a blockage in the buckle before they can start their previously planned journey.

Clearly, in the matter of seatbelt buckle blockage, prevention is better than cure. If it is possible to prevent entry of debris into the buckle, this could potentially avoid considerable inconvenience for the vehicle user.

Previous mechanisms intended to deter entry of debris into seatbelt buckles comprise doors or a slider which close the slot where the tongue enters the buckle.

However, this slot is necessarily inset into the buckle, so that any debris sitting on the door or slider may not be easily cleared before inserting the tongue into the buckle. Unfortunately in this context, the inset of the tongue insertion slot into the buckle is an essential feature for user convenience. As users often do not look at the buckle when they are fastening the seat belt, it is helpful to the user to have a tapered entry to the buckle, so that the seatbelt tongue does not have to be precisely aligned with the slot before insertion.

It is against this background that the present invention has been conceived. It is an aim of the present invention to collect any debris which may aggregate in the area of the seatbelt tongue entry into the buckle. A further aim of the invention is to provide a means whereby such debris may be removed from the buckle before the tongue is inserted into the buckle. This approach greatly reduces inconvenience caused by difficulties in fastening seatbelt tongues to buckles, with a minimal increase in complexity of the buckle assembly. Other aims and advantages of the invention will become apparent from the following description, claims and drawings.

Summary of the invention.

According to an aspect of the present invention, there is provided a seatbelt assembly comprising a length of webbing, a tongue and a buckle; said tongue comprising a webbing loop portion comprising a webbing slot, and a buckle insertion portion; said buckle comprising a tongue release button having an accessible operating face and a concealed body; an outer tongue insertion area adjacent to said release button operating face, said outer area having a width and/or height substantially greater than the corresponding dimensions of the buckle insertion portion of the tongue; an inner tongue insertion area inset from said outer tongue insertion area, said inner area having width and height similar to the corresponding dimensions of the buckle insertion portion of the tongue; a tapered passage between said outer and inner tongue insertion areas; and a barrier arranged to deter ingress of foreign objects, said barrier being mounted to said buckle adjacent to said outer tongue insertion area.

Advantageously, the present invention provides a barrier to ingress of foreign objects at the outer end of the tapered passage in the top of the buckle. This barrier collects foreign objects before they enter the main body of the buckle, and facilitates easier removal of foreign objects before buckling up the seatbelt.

In an example, the barrier substantially covers the outer tongue insertion area.

In an example, the tongue webbing loop portion webbing slot has a width greater than the width of the seatbelt webbing, and the buckle insertion portion of the tongue is narrower than the tongue webbing loop portion webbing slot.

In a further example, the barrier comprises a flap.

In an alternative example, the barrier comprises a set of bristles.

In an example, the barrier is arranged to deter ingress of foreign objects into a latching area inside said buckle, the latching area containing a latch arranged to retain said tongue when it is inserted into said buckle.

In an example, said barrier is rotatable outwardly of said buckle.

Advantageously, this feature allows a user to eject foreign objects from the area of the seatbelt buckle before fastening the seatbelt.

In a further example, the rotation of said barrier is actuated by a press button incorporated into said buckle.

In an alternative example, the rotation of said barrier is actuated by a press panel incorporated into said buckle.

According to another aspect of the present invention for which protection is sought, there is provided a vehicle seatbelt system comprising a seatbelt assembly according to any of the preceding paragraphs.

According to a yet further aspect of the present invention for which protection is sought, there is provided a vehicle comprising a vehicle seatbelt system according to the preceding paragraph.

Within the scope of this application it is envisaged that the various aspects, embodiments, examples, features and alternatives set out in the preceding paragraphs, in the claims and/or in the following description and drawings may be taken independently or in any combination thereof, except where there is an incompatibility of features.

While the examples given for suitable applications for the present invention relate to seatbelt buckle assemblies for passenger vehicles, it will be appreciated by one skilled in the art that there are potentially other uses for the present invention in both vehicle and non-vehicle applications; for example, in seatbelts for use in aircraft.

Brief Descriøtion of the Drawings The present invention will now be described, by way of example only, with reference to the accompanying drawings in which: Figure 1 shows a schematic perspective view of the webbing, tongue, and buckle of a known seatbelt assembly; Figure 2 shows a perspective view of the known seatbelt tongue of Figure 1; is Figure 3 shows a perspective view of a known seatbelt buckle assembly; Figure 4 shows a perspective view of a first embodiment of a seatbelt buckle assembly according to the invention; Figure 5 shows a perspective view of a second embodiment of a seatbelt buckle assembly according to the invention; and Figure 6 shows a partial cross-sectional view of the seatbelt buckle of Figure 4 along line il-Ijof Figure 4.

In the Figures described below, like parts are denoted by like reference numerals for ease of understanding.

Figure 1 shows parts of a known seatbelt assembly 500, comprising a length of webbing 100, a tongue 200, and a buckle 300. The seat belt assembly shown is suitable for a right-hand front vehicle seat, and is seen from a viewpoint approximately corresponding to a left-hand windscreen pillar of a vehicle to which said seatbelt assembly is fitted. The seatbelt assembly is shown as if a user (not shown) were about to buckle up, by inserting tongue 200 into buckle 300. The upper end 100U of webbing length 100 would in practice run through an upper mounting (not shown) to a retractor reel, while lower end 100L would run across a user's lap and around the vehicle seat to a floor mounting (not shown). Similarly, buckle 300 is conventionally mounted to the vehicle by a short length of webbing or cable (not shown). However, these terminations do not form part of the invention as claimed, and will therefore not be described further.

Figure 2 shows a known seatbelt tongue 200. This tongue comprises a webbing loop portion 220 enclosing a webbing slot 240, and a buckle insertion portion 260 comprising a hole 280, the purpose of which will be explained later. This Figure is also used to define the three orthogonal dimensional axes of the parts of the seatbelt tongue and buckle -length L, width W, and height H. It can be seen from this Figure that the width W260 of buckle insertion portion 260 is conventionally less than the width W240 of the webbing slot 240.

Figure 3 shows a known seatbelt buckle 300. A tongue release button 310 has an accessible operating face 314 and a concealed body 318 (schematically shown in dashed outline). When tongue 200 is inserted into buckle 300, it first passes through an outer tongue insertion area 320 adjacent to button 310, then down through a tapered passage 330 to an inner tongue insertion area 340, which is smaller (narrower and lower, with reference to the axes shown in Figure 2) than outer area 320. Tapered passage 330 allows tongue 200 to "self centre" as it is pushed into buckle 300, which helps the user to align tongue and buckle quickly and easily. (The hidden details of passage 330 and area 340 are shown in chain-dotted line to distinguish them from concealed button body 318) When tongue 200 has passed through area 340, it passes into the inner workings (not shown) of buckle 300. Hole 280 (Figure 2) engages with a latch (not shown) to secure the tongue 200 within buckle 300. Some prior art buckles have a door or slider closing inner tongue insertion area 340. This will keep foreign objects out of the inner workings of buckle 300 until tongue 200 is inserted into the buckle; but unfortunately, when the door or slider is opened, the foreign objects may fall into the buckle.

Figure 4 shows a first embodiment 305 of a buckle according to the invention. This is similar in general layout to buckle 300, but has a cover 350 over outer tongue insertion area 320 and adjacent to tongue release button 310, the operation of which is not affected. Cover 350 is shown with a hinge comprising ridge moulding 354 and pivot pins 352 engaging projections 356 from the body of buckle 305.

However, a hard cover 350 could be subject to accidental damage if a tongue is pushed into it by a forgetful user. An alternative solution (not shown) would be to have at least one soft and flexible flap 350 which could be pushed down into tapered portion 330 (Figure 3). By careful dimensional control, this flap could open the top of the buckle when pushed down; but still allow tongue 200 to pass into buckle 300, and to be locked in place. The flap would return to its closed position on release of the seat belt tongue by dint of its inherent elasticity, assisted by the outward passage of the tongue under spring pressure from the tongue release mechanism (not shown). Numeral 360 represents an optional press button, the purpose of which will be explained later.

Figure 5 shows a second embodiment 307 of a buckle according to the invention.

This is similar to buckle 305 of Figure 4, but instead of cover or flap 350, a foreign object guard is provided by a set of bristles 370. Numeral 372 represents a pivot pin, while 374 represents a spine member on which bristles 370 are mounted.

Numeral 380 represents an optional press panel, similar to press button 360 in Figure 4, the purpose of which will be explained below.

If a user wants to fasten a seat belt, but notices one or more foreign object(s) retained on the cover, flap, or bristles, the user can manually clear said foreign matter from the buckle before inserting the seatbelt tongue. However, this process may be tedious, and relies on the user looking before buckling up. Hence, Figure 6 shows a further development 308 of the first embodiment 305 of the buckle according to the invention. This further development is intended to allow quick, easy, and efficient clearance of foreign objects; and could also be applied to the bristles 370 of the Figure 5 embodiment. Press button 360 is seen in Figure 6 to be part of a larger moulding 361, comprising a lower mounting 362, a leg 364, a lever 366, and an over-centre latch 368. Lower mounting 362 is shown as a vertical pin, but other mounting techniques may be preferred to facilitate moulding of the buckle housing. Leg 364 is arranged to be flexible, so that when press button 360 is operated, the majority of moulding 361 moves towards tongue release button 310.

(In this Figure, to avoid confusion due to the multiplicity of sectioned parts, a space 316 for insertion of release button 310 is shown instead of the actual button). As moulding 361 moves, lever 366 presses against a projection 358 which depends from cover or flap 350. This in turn causes cover or flap 350 to hinge upwards around pin 352.

This mechanism is preferably designed to flick cover or flap 350 upwards rapidly from a substantially horizontal orientation to a substantially vertical orientation. This ensures not only a rapid and effective clearance of foreign objects lying on the cover or flap, but also ensures that said cover or flap does not obstruct the passage of tongue 200 into buckle 308. As many users grasp the seatbelt buckle with one hand while they insert the tongue into the buckle with the other hand, they may find it simple to operate press button 360 (Figure 4) or press panel 380 (Figure 5) with a thumb, while their fingers grasp the other side of the buckle. A thumb grip (385, Fig. 5) is located centrally on press panel 380, to make it easy to find panel 380 without looking. Numeral 368 represents an over-centre catch, which gives tactile feedback to the user that the cover has flipped up without the user having to look. Numeral 335 represents an upstanding section of the buckle body adjacent to leg 364. Should leg 364 not provide sufficient spring force to return press button 360 to its inoperative location as shown, a coil spring (not shown) could be assembled into the buckle assembly between leg 364 and upstanding section 335.

The "flip up" mechanism of Figure 6 may also be applied to the bristles 370 of Figure 5.

Other advantages will be apparent to one skilled in the art, and the present examples and embodiments are to be considered illustrative and not restrictive.

The invention is not to be limited to the details given herein, but may be modified within the scope and equivalence of the appended claims.

Claims (1)

1. <claim-text>CLAIMS1. A seatbelt assembly comprising a length of webbing, a tongue and a buckle; said tongue comprising: a webbing loop portion comprising a webbing slot; and a buckle insertion portion; said buckle comprising: a tongue release button having an accessible operating face and a concealed body; an outer tongue insertion area adjacent to said release button operating face, said outer area having a width and/or a height substantially greater than the corresponding dimensions of the buckle insertion portion of the tongue; an inner tongue insertion area inset from said outer tongue insertion area, said inner area having width and height similar to the corresponding dimensions of the buckle insertion portion of the tongue; a tapered passage between said outer and inner tongue insertion areas; and a barrier arranged to deter ingress of foreign objects, said barrier being mounted to said buckle adjacent to said outer tongue insertion area.</claim-text> <claim-text>2. A seatbelt assembly according to claim 1, wherein the barrier substantially covers the outer tongue insertion area.</claim-text> <claim-text>3. A seatbelt assembly according to claim 1 or claim 2, wherein the webbing loop portion webbing slot of the tongue has a width greater than the width of the seatbelt webbing, and the buckle insertion portion of the tongue is narrower than the webbing loop portion webbing slot of the tongue.</claim-text> <claim-text>4. A seatbelt assembly according to any preceding claim, wherein the barrier comprises a flap.</claim-text> <claim-text>5. A seatbelt assembly according to any one of claims 1 to 3, wherein the barrier comprises a set of bristles.</claim-text> <claim-text>6. A seatbelt assembly according to any preceding claim, wherein the barrier is arranged to deter ingress of foreign objects into a latching area inside said buckle, the latching area containing a latch arranged to retain said tongue when it is inserted into said buckle.</claim-text> <claim-text>7. A seatbelt assembly according to any preceding claim, wherein said barrier is rotatable outwardly of said buckle.</claim-text> <claim-text>8. A seatbelt assembly according to claim 7, wherein the rotation of said barrier is actuated by a press button incorporated into said buckle.is 9. A seatbelt assembly according to claim 7, wherein the rotation of said barrier is actuated by a press panel incorporated into said buckle.10. A seatbelt assembly as herein described and as illustrated in any one or more of Figures 4 to 6.11. A vehicle seatbelt system comprising a seatbelt assembly according to any of claims ito 10.12. A vehicle comprising a vehicle seatbelt system according to claim 11.</claim-text>