Patent Application
20090015038
This document relates to an automotive sunshade panel and guide track system therefor and, more particularly, to an automotive sunshade panel and guide track system for use in conjunction with a sunroof.
Automobiles are often provided with a sunroof that is fixed or positionable within a ceiling portion of a vehicle body to enhance passenger comfort. A rigid, glass or plastic panel is used to close-off the opening in the roof, as desired. To reduce the sun load within the vehicle, a sunshade is typically provided that forms part of the headliner. The sunshade can be selectively closed to block off the opening to reduce or eliminate sunlight coming in through the sunroof panel.
Purchasers of today's automobiles demand an ever increasing level of quality, particularly in the area of fit and finish. Those buyers who purchase an optional sunroof demand an easy to operate device that includes a sunshade having a look and feel of quality. The sunshade must be smoothly positionable and remain in whatever position it is placed, despite sudden movements of the vehicle. To achieve these ends, a certain amount of friction should occur between the lateral edges of the sunshade and the guide tracks.
In one sunshade assembly design, the lateral edges of the sunshade are provided with slide shoes that are slideably mounted within the guide tracks. A problem with this assembly design is that small dimensional variations in the slide shoes may yield large variations in the frictional force required to open and close the sunshade.
U.S. Pat. No. 3,691,686 proposes a window shade assembly including a curved shade frame and shroud in which a resilient shade having a curvature differing from that of the frame is installed. The shade has frictional means along the edges thereof to engage the frame and to enable restricted sliding motion therebetween.
U.S. Pat. No. 5,845,959 proposes a slide tilt roof apparatus wherein a rise/fall retaining portion is provided on a member which is longitudinally movable following the movement of the corresponding lifter so that the engagement portion at the rear end of the rising/falling link can be guided when the rising/falling link forwardly tilt pivots and also when the link pivots to erect, whereby the posture of the rising/falling link can be changed by a single member. A substantially flat sunshade is proposed as part of the apparatus, which is slideably positioned within a sunshade guide groove. The edges of the sunshade are provided with three tabs spaced along each edge and slideably mounted within the guide groove. Slide shoes are not used in the proposed design.
U.S. Pat. No. 6,729,074 proposes an assembly having two opposing parallel guides and a panel having two opposite parallel lateral edges said to cooperate with the guides for a frictional sliding movement of the panel relative to the guides. The edges of the panel are curved and provided with three tabs spaced along the edges, such that three contact points are provided between each edge and the corresponding guide. As proposed, each contact point engages only one of the guide surfaces of the corresponding guide. As proposed, two contact points are provided near the ends of each edge and there is also provided an intermediate contact point. The assembly is said to have utility in an open roof assembly for a vehicle.
It may be noted that the assembly proposed in U.S. Pat. No. 6,729,074, by providing contact points that only minimally engage one of the two guide surfaces of each corresponding guide, may yield an assembly that has an ever decreasing frictional force over the life of the vehicle.
As such, despite the advances in the art, there remains a need for an improved automotive sunshade panel and guide track system therefor.
In one aspect, provided is a sunshade assembly. The sunshade assembly includes a frame, the frame having a pair of opposing guide tracks, each guide track having a pair of spaced parallel guide surfaces, a sunshade panel having a forward portion, a rearward portion and a pair of curved lateral edges, and a plurality of guide tabs extending outwardly from each of the pair of curved lateral edges and positioned along a radius of curvature for placement within the pair of opposing guide tracks, at least one of the guide tabs of each curved lateral edge positioned within the forward portion of the sunshade panel and at least one of the guide tabs of each curved lateral edge positioned within the rearward portion of the sunshade panel, wherein the at least one guide tab positioned within the forward portion of the sunshade panel and the at least one guide tab positioned within the rearward portion of the sunshade panel are each of a length sufficient to contact each parallel guide surface of the pair of spaced parallel guide surfaces to provide a frictional slideable fit within the pair of opposing guide tracks.
In another aspect, provided is a sunshade panel for use in an assembly having a pair of opposing guide tracks, each guide track having a pair of spaced parallel guide surfaces. The sunshade panel includes a forward portion, a rearward portion and a pair of curved lateral edges, and a plurality of guide tabs extending outwardly from each of the pair of curved lateral edges and positioned along a radius of curvature for placement within the pair of opposing guide tracks, at least one of the guide tabs of each curved lateral edge positioned within the forward portion of the sunshade panel and at least one of the guide tabs of each curved lateral edge positioned within the rearward portion of the sunshade panel, wherein the at least one guide tab positioned within the forward portion of the sunshade panel and the at least one guide tab positioned within the rearward portion of the sunshade panel are each of a length sufficient to contact each parallel guide surface of the pair of spaced parallel guide surfaces to provide a frictional slideable fit within the pair of opposing guide tracks.
In one form, the plurality of guide tabs of each curved lateral edge includes a third guide tab positioned along a radius of curvature. The third guide tab may be positioned between the at least one guide tab positioned within the forward portion of the sunshade panel and the at least one guide tab positioned within the rearward portion of the sunshade panel.
In another form, the third guide tab of the plurality of guide tabs of each curved lateral edge is of a thickness sufficient to contact each parallel guide surface of the pair of spaced parallel guide surfaces to provide a frictional slideable fit within the pair of opposing guide tracks. This provides a further enhancement in the frictional sliding movement of the sunshade panel relative to the guide tracks.
In yet another form, to further enhance resiliency and the frictional sliding movement of the sunshade panel relative to the guide tracks, relief cuts are provided within the at least one guide tab positioned within the forward portion of the sunshade panel and the at least one guide tab positioned within the rearward portion of the sunshade panel along portions of the curved lateral edge.
In still yet another form, only the respective edges of the sunshade panel are curved, although it is also contemplated that the sunshade panel is curved.
The sunshade assemblies disclosed herein can be used in conjunction with a sunroof assembly for a vehicle having a roof opening defined in the fixed roof of the vehicle.
In a further form, a sunshade panel is provided having a substrate manufactured from a glass-reinforced composite material with a foam layer covered on one side by a cloth.
In a still further form, the sunshade panel is manufactured from a composite material such as glass-filled polypropylene.
These and other features will be apparent from the detailed description taken with reference to the accompanying drawings.
Further explanation may be achieved by reference to the description that follows and the drawings illustrating, by way of non-limiting examples, various forms, wherein:
Various aspects will now be described with reference to specific forms selected for purposes of illustration. It will be appreciated that the spirit and scope of the assemblies disclosed herein are not limited to the selected forms. Moreover, it is to be noted that the figures provided herein are not drawn to any particular proportion or scale, and that many variations can be made to the illustrated forms. Reference is now made to
Referring to
The panel 20 may be formed of a transparent or colored glass or plastic, a metal plate or the like, and is fixedly attached with a metal frame (not shown) on a marginal portion of the inner face thereof and with a weather strip 24 on the outer periphery thereof. Lifters 22 projecting downward are mounted to each of the right and left sides of a frame 26.
Frame 26 is secured below the roof 16 and is substantially U-shaped in plan having right and left side portions and a front portion. A connection plate 24 is secured to a longitudinally intermediate portion of the frame 26. The space enclosed by the connection plate 28 and the front portion of the frame 26 forms an inner opening portion 30.
A drip rail 32 may also be provided, the opposite ends of which are connected to support members 34, respectively. Each of these support members 34 is longitudinally slidably supported by a shoe guide (not shown) and is operatively connected to the lifters 22, thereby permitting vertical movements of the lifters 22.
A deflector 36 may also be provided that is capable of projecting upward from the opening portion 30 when the panel 20 is opened. Other details of the operation of sunroof assembly 10 may be found in U.S. Pat. No. 5,845,959, the contents of which are hereby incorporated by reference for these details.
Still referring to
Referring also to
As may be best seen by reference to
In another form, the plurality of guide tabs 54(a-c) of each curved lateral edge 52 includes a third guide tab 54b, which may also be positioned along radius of curvature R, as may be seen in
As may be seen in
As may be appreciated by those skilled in the art, the plurality of guide tabs 54(a-c) can be formed in any of several ways. For example, the guide tabs 54(a-c) can comprise extensions of or projections from the respective curved lateral edges 52 of sunshade panel 46, attached thereto in any appropriate manner, or the guide tabs 54(a-c) may be the result of the provision of recesses in the respective curved lateral edges 52.
As shown in
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Referring now to
While in the illustrated forms, sunshade panel 46 is curved in its entirety, it also envisioned and within the scope of this disclosure that sunshade panel 26 may be substantially flat. In this form, nevertheless, a pair of curved lateral edges 52 is provided together with a plurality of guide tabs 54(a-c) extending outwardly from each of the pair of curved lateral edges 52. The plurality of guide tabs 54(a-c) are positioned along a radius of curvature R for placement within the pair of opposing guide tracks 42, at least one of the guide tabs 54a of each curved lateral edge 52 positioned within the forward portion 48 of the sunshade panel 46 and at least one of the guide tabs 54c of each curved lateral edge 52 positioned within the rearward portion 50 of the sunshade panel 46.
In the production of sunshade panel 46, a panel substrate may be first manufactured from a suitable thermoplastic material. To the panel substrate, a foam layer (not shown) and a cloth layer (not shown) can be applied to the surface that will face the interior of the vehicle, as is conventional. Sunshade panel 46 may be produced by conventional thermoforming or compression molding, as desired.
A broad range of thermoplastic resins, whether crystalline or amorphous, can be utilized. Examples of crystalline polymers include polyolefins, polyamides, polyesters, polyaryletherketones, polyoxymethylene polymers, etc. Examples of amorphous polymers include polycarbonates, acrylics, polystyrenes, etc. Copolymers such as styrene-acrylonitriles and terpolymers such as acrylonitrile-styrene-acrylic and acrylonitrile-butadiene-styrene can also be used. Also, alloys and blends of various thermoplastics described above can be used herein.
Thermoplastic resins utilized herein should have good flow properties for ease of processing and structural integrity. To obtain higher stiffness and higher heat distortion temperature, the thermoplastic material may be reinforced with one or more reinforcing agents. Common reinforcing agents include fibrous materials such as glass fibers, polymeric fibers and natural fibers such as jute, and minerals such as mica and talc. One reinforcing agent having utility herein is glass fiber with a 10-20 micron diameter and a 3-4 mm length. Longer glass fibers of about 12 mm in length can also be used to further improve the properties of the thermoplastic material. In one form, the composite material is a high performance thermoplastic material such as glass-filled polypropylene.
In another form, the composite material is a high performance thermoplastic material such as AZDEL®, available from AZDEL, Inc. of Forest, Va. These materials come in two forms, AZDEL SuperLite®, a low pressure, thermoformable composite of polypropylene and long chopped fiber combined with outer layers as needed. It is available as a sheet product that may be thermoformed into shape and is used in applications where a high stiffness-to-weight ratio is required. It is available in densities from 600 grams per square meter (gsm) to 2000 gsm. The other form is AZDEL Laminate® GMT. AZDEL Laminate is a five layer composite of glass fiber and thermoplastic resin and is usually compression molded, although it may also be thermoformed using several industry standard methods of production.
The sunshade panels and assemblies disclosed herein produce frictional forces and slide forces that do not vary significantly with varying dimensions. Moreover, variations in the shape of the sunshade panel or its edges do not have a large influence on the resulting frictional forces. Thus, an assembly is provided in which the sunshade panel experiences a rather consistent slide force, leading to reproducible results.
All patents, test procedures, and other documents cited herein, including priority documents, are fully incorporated by reference to the extent such disclosure is not inconsistent with this disclosure and for all jurisdictions in which such incorporation is permitted.
While the illustrative embodiments disclosed herein have been described with particularity, it will be understood that various other modifications will be apparent to and can be readily made by those skilled in the art without departing from the spirit and scope of the disclosure. Accordingly, it is not intended that the scope of the claims appended hereto be limited to the examples and descriptions set forth herein but rather that the claims be construed as encompassing all the features of patentable novelty which reside herein, including all features which would be treated as equivalents thereof by those skilled in the art to which the disclosure pertains.
