Adjustable auxiliary vehicle light
BACKGROUND OF ART 
     This invention relates to vehicle signal lights and more particularly to vehicle signal lights adapted to be attached to the vehicle inside the vehicle window. 
     Vehicle signal lights are necessary safety devices which allow a vehicle driver to alert the drivers of other vehicles. It is particularly important for the driver to warn the drivers of trailing vehicles when the driver is decelerating or stopping. Conventionally, this warning is made through the use of brake lights mounted to the vehicle and visible from behind the vehicle. Some early automobile designs employed rear signal lights that were mounted near the passenger compartment of the vehicle and relatively high off the roadway. Sometimes these lights were mounted within the vehicle and were viewable through the vehicle&#39;s rear window. Modern automobiles typically have engine or baggage compartments situated between the passenger area and the signal lights. These compartments are located below the level of the rear window to provide the vehicle occupants with an unobstructed view. Signal lights are typically mounted to the rear end of these compartments and consequently at a relatively low elevation. The effectiveness of these low level signal lights can be diminished in situations where traffic is closely packed such that the signal lights pass out of the usual span of vision of a trailing vehicle&#39;s operator. Recently, this problem has been solved on new automobiles by providing additional signal lights, particularly brake lights, at higher elevations on the rear of the automobile, such as on the luggage compartment, on the roof, or inside the rear window. Still, most of the vehicles on the road today lack elevated rear signal lights. These vehicles would most likely continue on the road without auxiliary brake signals until signal devices are designed to fit and conveniently install on the various shapes of existing conventional vehicles. 
     SUMMARY OF THE INVENTION 
     The auxiliary signal light of this invention is designed to adhere to the inside of a vehicle window and may thus be used to provide an additional elevated brake light on conventional automobiles. The signal light disclosed has a housing which adjusts within a bracket to allow the user to vary the lens angle and to effectively use the light with many of the variously sloped windows seen in vehicle design. Preferably, the signal light may be conveniently connected to auto wiring either above or below the position of the light. The disclosed light may be conveniently assembled, repaired and adjusted by snapping together its interlocking parts and may be made inexpensively by molding resilient plastic materials. Other objects, advantages and features of the present invention will be apparent from the following specification when taken in conjunction with the accompanying drawings. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a perspective view through the window of a vehicle equipped with an auxiliary signal or brake light constructed in accordance with this invention. 
     FIG. 2 is a more detailed perspective view of the preferred brake light of FIG. 1. 
     FIG. 3 is an exploded perspective view of the brake light of FIG. 1. 
     FIG. 4 is an end view of the light housing of the brake light of FIG. 1. 
     FIG. 5 is a partial section view taken along section 5--5 of FIG. 4 showing the profile of the housing cup used for retaining the brake light housing in a selected position. 
     FIG. 6 is a section view taken through section 6--6 of FIG. 3 showing the interior of a bracket side fin. 
     FIG. 7 is a partial top view of the bracket side fin and tab shown in FIG. 6 used to secure the brake light housing in a selected position. 
     FIG. 8 is an elevation view of the housing of the brake light of FIG. 1, showing a heat sink mounted on the peripheral arcuate wall of the housing. 
     FIG. 9 is a section view of a brake light taken along section 9--9 of FIG. 1 constructed in accordance with this invention and adhered to the rear window of a conventional vehicle with the wiring connected from below the brake light. 
     FIG. 10 is a section view of a brake light taken along a section analogous to section 9--9 constructed in accordance with this invention adhered to the rear window of a hatchback automobile with the wiring connected from above the brake light. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENT 
     An auxiliary adjustable signal and brake light constructed in accordance with this invention is shown generally at 12 in FIG. 1 with its face 13 adhesively attached to the inside surface of the rear window 14 of a vehicle 15 and its body 16 extending into the passenger area of the vehicle. As best shown in FIG. 3, the adjustable signal light 12 includes a lamp 18 having a holder 19 and a bulb 20. The lamp 18 is designed to mount within the lamp chamber 21 of a housing 22. The housing 22 is molded from plastic and has opposed parallel side walls 24 and 25. A peripheral arcuate wall member 26 extends between the side walls 24 and 25 to define with them the lamp chamber 21. The lamp chamber 21 is open in a direction perpendicular to the side walls 24 and 25 to allow exit of light emitted by the bulb 20. 
     In the preferred embodiment, the arcuate wall member 26 has an opening 30 within which may be mounted an electrical circuit board with logic circuit. The board 31 is not required if the auxiliary brake light is to be installed in vehicles wherein separate bulbs and circuits are utilized for each vehicle brake light and turn signal light. However, if the auxiliary brake light is to be installed in vehicles which utilize a single bulb for a brake light and turn signal light (and four-way flasher light) a logic circuit is required to distinguish the electrical signals for the brake lights and four-way flashers (which must actuate the auxiliary brake light) from signals for the right or left turn signals (which should not actuate the auxiliary brake light). Conventional auxiliary brake lights do not usually enclose such logic circuits within their light housings because such circuits may be adversely affected by heat from the circuit and the lamp 18 if closely confined with the lamp 18. Accordingly, such circuits are usually mounted at some distance from the auxiliary brake light within the baggage compartment or elsewhere. In the preferred embodiment, as best shown in FIG. 8, an aluminum heat sink 33 is mounted within the opening 30 on mounting posts 26a extending outwardly from the arcuate wall member 26. The heat sink 33 substantially closes the opening 30 but provides a thermally conductive path for dissipating heat generated within the housing by silicon rectifiers and other heat producing components of the logic circuit, as well as by the lamp 18. If required, the circuit board 31 is preferably mounted on the heat sink 33 by mounting screw 33a threadedly engaged through the heat sink 33, as indicated in FIG. 3. The heat producing components of the logic circuit (not shown) may preferably be thermally connected to the heat sink 33 by direct contact or by other conventional means. 
     Wiring 34 is adapted to connect the lamp 18 to the electrical system of the vehicle 15 and passes out of the lamp chamber 21 to the electrical system through a hole 35 in the arcuate wall member 26. If the auxiliary brake light is equipped with a circuit board 31 and logic circuit, the wiring 34 will connect the circuit board 31 to the lamp 18 in a conventional manner. A lamp mount 40 is provided in the lamp chamber 21 to secure the lamp 18 in place. A translucent lens 42 is secured near the face of the housing 22 to substantially enclose the lamp 18 within the lamp chamber 21. Preferably, the lens 42 has resilient clips 43 adapted to reversibly engage slots 44 on the housing side walls 24 and 25 so that the lamp 18 may be accessed for maintenance. 
     As shown in FIG. 3 and FIG. 4, a receptacle 50 is affixed on the exterior surface of each side wall 24 and 25. The receptacles 50 each preferably include a generally planar base 51 with a center opening 52 and a plurality of teeth 54 exteriorally raised above the base and radially spaced about the center. The teeth 54 preferably have a triangular cross-section with the inclined sides of the adjacent teeth intersecting to form channels 56 between the teeth. The receptacle bases 51 are generally parallel to the side walls and the centers 52 of the two receptacles 50 are axially aligned such that the bases are generally perpendicular to a straight line passing through the two centers. The receptacles 50 of the preferred embodiment have peripheral rims 58 which surround the bases 51 and, as shown in FIG. 5, extend exteriorally therefrom a selected distance beyond the outermost extremity of the teeth 54. As previously indicated, the housing 22 is preferably a unitary piece of molded plastic, and the receptacles 50 are molded therein. 
     A bracket 45 is provided for adjustably mounting the housing 22 in position on the window 14. The bracket 45 includes a frame 46 with a frame opening 47 through which the lens 42 is visible from the face 13 of the adjustable signal light 12, and two opposed generally parallel side fins 48 and 49 which extend from the frame 46 on opposite sides of the frame opening 47. The side fins 48 and 49 are spaced apart sufficiently to allow the housing 22 to be positioned between them with the exteriors of the side walls 24 and 25 respectively adjacent to the interiors of the fins 48 and 49. Moreover, the side fins 48 and 49 are resilient such that they may be forced laterally away from the side walls 24 and 25, and they will snap back toward the side walls upon release. 
     A plate 60 is affixed or molded on the interior surface of each of the side fins 48 and 49. As shown in FIG. 6, each plate 60 has a central point 61 which is adapted to be aligned axially with the receptacle center openings 52 when the housing 22 is mounted within the bracket 45, and a plurality of tabs 62 of triangular cross-section which radiate from the central point 61 and are sized such that they are snugly received within radial channels 56 on the receptacles 50 of the adjacent side walls 24 and 25 when the housing 22 is engaged between the side fins 48 and 49, thereby holding the housing 22 in a first selected position within the bracket 45. The channels 56 and tabs 62 of this invention are sized such that when the fins 48 and 49 are laterally forced away from the side walls 24 and 25, the housing 22 may be selectively rotated about the common axis of the center openings 52. Upon release of the fins, the tabs will be received within adjacent aligned channels 56 with the housing held in another selected position within the bracket 45. Preferably, the receptacle bases 51 are circular; the channels 56 are of uniform dimensions and radially oriented about the base center openings 52; and the tabs 62 have dimensions generally corresponding to the dimensions of the channels to permit full engagement of the tabs within the channels. As best shown in FIG. 7, the plates 60 of the preferred embodiment have a recessed surface 64 extending between the tabs 62 and designed to fit within the rims 58 exteriorly from the teeth 54. The fit of the plates 60 within the receptacles 50 is improved in the preferred embodiment by sloping both the inside surface 59 of the rim 58, as shown in FIG. 5, and the peripheral edge 66 of the plates 60, as shown in FIG. 7. 
     The tabs 62 and the channels 56 which receive the tabs in multiple positions function together as a means for adjustably mounting the housing within the bracket such that the lens orientation may be adjusted. This adjustable mounting means is important for adapting the adjustable auxiliary vehicle light of this invention to the various vehicle models with which it might be used. This design also allows the housing 22 to be removeably mounted by conveniently snapping the side walls in and out of the bracket fins. Moreover, the user of the adjustable signal light 12 may adjust the orientation of the lens 42 by varying the particular channels in which the tabs 62 are positioned. The preferred channel and tab design used to achieve lens adjustability has been described above. However, other mating structural elements within the scope of this invention will be evident to those skilled in the art. Of course, the adjustment means need not include the preferred interlocking male and female members, but might utilize frictional contact, ball and detent, removeable locking pins or other equivalent means for selectively adjusting and securing the members in desired position. 
     Adhesive means are provided for adhesively securing the face frame 46 to the window 14. As shown in FIG. 3, the preferred adhesive means includes an adhesive member 68 which is secured to the face of the frame 46 and, as illustrated in FIGS. 9 and 10, is adapted to adhesively bond to the window 14. 
     The preferred embodiment also includes a casing 70 which is positioned around the housing 22 so as to enclose and protect the housing against accidental readjustment. As shown in FIGS. 3 and 6, the bracket frame 46 has a top ledge 74 and a bottom ledge 76. FIG. 3 illustrates that the casing 70 has a top ridge 80 shaped to snugly engage the bracket top ledge 74; bottom fingers 82 shaped to snugly engage the bracket bottom ledge 76, and resilient bottom loops 78 adapted to removeably engage lugs 79 on the underside of the bottom ledge 76. Thus, the casing may be removeably locked snugly in position around the housing 22. The casing 70 preferably also has side flanges 83 adapted to engage the bracket side fins 48 and 49, thereby locking the side fins in engagement with the housing side walls 24 and 25 and substantially preventing the side fins from flexing outwardly and releasing the housing side walls when the cover 70 is fully engaged on the bracket 45. The casing has bottom holes 84 spaced between the fingers 82 through which the wires 34 may pass when the auxiliary adjustable signal light 12 is mounted above the rear deck of a conventional vehicle as shown in FIG. 9. Moreover, the bottom holes 84, together with the vents 86, provide for air circulation around the housing arcuate wall member 26. Alternately, a hole 88 may be provided or drilled through the top of the casing 70 for passage of the wires 34. This design is particularly useful for mounting the auxiliary adjustable signal light 12 to the window 14 of a hatchback vehicle as shown in FIG. 10, wherein the wires 34 may most suitably exit the top of the casing toward the roof of the vehicle. 
     The housing 22, the bracket 47 and the casing 70 may all be conveniently molded of resilient synthetic plastic material such as polycarbonate and the lens 42 may be made of translucent plastic such as polycarbonate. In particular polycarbonate marketed by General Electric under the trademark LEXAN is well suited for the molded plastic components of the brake light. The lens preferably includes multiple prism structures (not shown) on the lens inside surface which each refract light from the bulb filament and collectively project a bright light from the lens without need of a reflective surface around the lamp. If desired, reflective material may be mounted on or near the inside surface of the housing arcuate wall member 26, in parabolic fashion, to enhance the brightness of the light transmitted through the lens. 
     As disclosed above, all structural parts of the preferred embodiment may be removeably snapped together during construction and use. Even after the bracket 45 is adhesively bound to the vehicle window 14, the parts containing substantially all the electronic components of the preferred adjustable signal light 12 may be assembled, disassembled for repair, and reassembled with convenience at a location outside of the vehicle 15, and may then be snapped into place and mounted on the bracket. 
     While the particular materials, parts and methods of assembly disclosed are those of the preferred embodiment, it will be apparent that other materials, parts and modes of assembly are possible. It is understood that the present invention is not limited to the particular materials of construction and arrangement of parts illustrated and disclosed above. Instead, it embraces all such modified forms thereof as come within the scope of the following claims.