Door stop for vehicles

Abstract: Vehicle door check device comprising: a longitudinal tie (14) provided on its outer surface with at least one retention seat (16), a holder (12) with a passage (28) through which the tie (14) can slide, a plurality of retention bodies (40) supported by the holder and engaging in the said one or more retention seats so as to define at least one stable retention position, and elastic means (34) acting between the said retention bodies (40) and the said holder (12) so as to push the retention bodies (40) against the tie (14). The tie (14) has a circular cross section and the retention bodies (40) act along radial directions with respect to the axis of the tie (14).

Description: The present invention relates to a vehicle door check device of the type comprising: a longitudinal tie provided on its outer surface with at least one retention seat, a holder with a passage in which the tie can slide, a plurality of retention bodies supported by the holder and engaging in the said one or more retention seats so as to define at least one stable retention position, and elastic means acting between the said retention bodies and the said holder so as to push the retention bodies against the tie. Retention devices of the type indicated above are known from documents EP-A-0525268, FR-A-1414880, US-A-2321409, DE3515883 and FR1143995. In the above known solutions, the tie consists of a rectangular-section bar with two major faces on which the retention bodies act as they are pushed elastically against the tie. One of the problems with the known solutions is that the tie can compensate to only a very limited extent for errors of planarity between the hinge plane of the door and the post. Experience shows that these errors of planarity can be large. DE-U-9001979 discloses a vehicle door check device having the features contained in the preamble of claim 1. In the solution disclosed in this document, the tie rod has a circular cross section and the retention bodies are balls or rollers radially pressed against the outer surface of the tie rod. The balls or rollers cooperate with wedge shaped elements having the funtion of transmitting to the balls or rollers the force of compression springs acting in a direction parallel to the axis of the tie rod. Although the solution according to DE-U-9001979 is an improvement with respect to the compenstion of planarity errors between the door and the post, this solution is still affected by many disadvantages, in particular from the point of view. of the costs and of the noise during operation. Accordingly, the object of the present invention is to provide a door check device of the type specified above that is simple and reliable and can compensate for even large errors of planarity. According to the present invention, this object is achieved with a door check device having the characteristics that form the subject of the main claim. The invention will now be described in detail with reference to the accompanying drawings, which are given purely by way of non-restrictive example, in which: Figure 1 is a partly sectioned perspective view of a door check device according to the present invention, Figure 2 is a perspective view from a different angle of the holder indicated by arrow II in Figure 1, Figure 3 is an exploded perspective view of the holder of Figure 2, and Figure 4 is a partly sectioned schematic illustrating the door check device according to the invention mounted on a vehicle. Referring to the figures, the number 10 indicates a vehicle door check device comprising a holder 12 designed to be mounted on a door P of a vehicle, and a longitudinal tie 14 designed to be hinged to a post M of the vehicle about an axis parallel to the hinge axis of the door P. The tie 14 is circular in cross section and has one or more locating seats. In the example illustrated in the figures the tie 14 has two locating seats 16 each in the form of an annular groove formed on the outer surface of the tie. The tie 14 has a hinge hole 18 at one end, and a protuberance 20 at the other to which a stop piece 22 is fixed (Figure 4). The tie 14 is made of metal and may be provided with a layer of plastic material co-moulded onto its outer surface. The holder 12 is made of stamped metal and exhibits a chamber 24 of circular shape with a bottom wall 26 in which a passage 28 is formed through which the tie 14 can slide. The holder 12 also has a flange 30 with a pair of holes 32 for fixing the holder 12 to the door P with screws (not shown). The chamber 24 of the holder 12 houses a plurality of elastic pieces 34, of which there are three in the example illustrated in the figures. The elastic pieces 34 are preferably blocks of elastomeric material in the form of sectors of an annulus of square cross section. Each of the elastic pieces 34 is preferably provided, on its face turned towards the centre of the chamber 24, with a half-cylindrical seat 36 and with two holes 38. The door check device according to the invention also includes a plurality of retention bodies 40 of which there are three in the example illustrated in the figures. Each retention body 40 is of arcuate shape with an outward side resting against the inward face of its particular elastic piece 34. On the outward face of each retention body 40 are a pair of dowel projections 42 that insert into the holes 38 of its particular elastic piece 34. In addition, each retention body 40 possesses a half-cylindrical projection 44 that fits into the half-cylindrical seat 36 of the corresponding elastic piece 34. On the inward face, each retention body 40 has a projection 46 of spherical or cylindrical form designed to engage in the outer surface of the tie 14. The retention bodies 40 may be made of sintered metallic material or rigid plastic material. When the tie 14 is not inserted in the holder 12 the elastic pieces 34 are in a condition of rest. In this condition a circle tangential to the innermost points of the projections 46 of the retention bodies 40 has a diameter less than the smallest diameter of the tie 14. This means that when the tie 14 is inserted into the holder 12, the retention bodies 40 are pushed radially out and radially compress the elastic pieces 34. The retention bodies 40 are therefore pushed elastically radially against the outer surface of the tie 14 by the elastic pieces 34. The mutually interlocking surfaces 44 and 36 of the retention bodies 40 and of the elastic pieces 34, respectively enable the retention bodies 40 to be orientated parallel with the longitudinal axis of the tie 14. The area of contact between each retention body 40 and the outer surface of the tie 14 is essentially point-like. The tie 14 will therefore be free to assume different angles of inclination with respect to the holder 12 without particular constraints or impediments. A closing plate 48 (Figures 1 and 4) is fixed to the holder 12 to close the open side of the chamber 24 and prevent the escape of the retention bodies 40 and of the elastic pieces 34. The closing plate 48 contains a hole 50 (Figure 4) through which the tie 14 can slide. As illustrated in Figure 1, the closing plate 48 is preferably fixed to the holder 12 by four tabs 52 which are bent over against the holder 12. Referring to Figure 4, during the opening and closing of the door P the tie 14 slides in the direction of its own longitudinal axis relative to the holder 12. When one of the locating seats 16 of the tie 14 coincides with the retention bodies 40 inside the holder 12, the projections 46 of the retention bodies 40 drop into the retention seat 16 and produce a retention force on the tie 14. To release the tie 14 from the retention pieces 40 a force greater than a predetermined value must be applied to the door P. The cylindrical geometry of the tie 14 and of the holder 12 allows the device according to the present invention to compensate automatically for misalignments between the hinge axis of the tie 14 at the post M and the plane to which the holder 12 is fixed. The retention bodies 40 adapt automatically to any variation in the axis of the tie 14 without any appreciable deterioration in its operation.

Claims: Vehicle door check device comprising: a longitudinal tie (14) with a circular cross section, provided on its outer surface with at least one retention seat (16), a holder (12) having a chamber (24) with a cylindrical surface and a passage (28) through which the tie (14) can slide, a plurality of retention bodies (40) supported by the holder (12) and engaging in said at least one retention seat (16) so as to define at least one stable retention position, and elastic means (34) acting so as to push the retention bodies (40) against the tie (14) along radial directions with respect to the axis of the tie (14) characterized in that : said elastic means comprise a plurality of blocks of elastic material (34), each of which is in the shape of a sector of an annulus, with an outward side resting against said cylindrical surface of said chamber (24) and an inward side, each of said retention bodies (40) is arcuate with a convex outward side resting against said inward surface of a respective block of elastic material (34) and an arcuate inward surface having a projection (46) capable of establishing an essentially point-like area of contact with the outer surface of the tie (14), said retention bodies (40) and said blocks (34) including mutually-interlocking locating surfaces (44, 36) that enable orientation of the retention bodies (40) along a direction essentially parallel to the axis of the tie (14). Device according to claim 1, characterised in that said mutually-interlocking locating surfaces (44, 36) comprise a half-cylindrical seat (36) on said inward side of each block (34) and a half cylindrical projection (44) on the outward side of each retention body that fits into said half-cylindrical seat (36) of the respective block (34).

Inventors: AUDISIO VITTORIO, AUDISIO, VITTORIO
Applicants: GAMMASTAMP SPA, GAMMASTAMP S.P.A.
Application year: 2000
Main classification: E05C17
IPC codes: E05C17