Light mount assembly having raised and lowered positions
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     This invention relates to assemblies for mounting lights on a vehicle and more particularly to such an assembly which mounts on the top of a vehicle and has a vehicle mounting bar that can alternatively be set in either a raised or lowered position. 
     2. Description of the Prior Art 
     Various mounting assemblies are available in the prior art for use in mounting lights across the top of a vehicle. Such assemblies generally include a pair of mounting brackets which are attached to the opposite sides of the vehicle between which a mounting bar for the lights is supported. There is a problem with the mounting of lights in this fashion in that the effective height of the vehicle is increased so as to make it impossible to bring the vehicle into certain areas having limited height clearances, such as garages. 
     SUMMARY OF THE INVENTION 
     The present invention solves this problem by providing an assembly in which the effective height presented by the vehicle can be lowered by rotating the mounting bar supporting the lights to bring such lights to a horizontal position. This end result is achieved both simply and rapidly. At the same time firm support of the lights in both the raised and lowered positions is provided. 
     The assembly of the invention includes a pair of brackets which are mounted on opposite sides of the vehicle and a support bar which runs across the top of the vehicle between the brackets. The lights are mounted on the support bar and are in a normally upright position when the bar is in its raised position. The bar is mounted on the brackets for limited pivotal adjustment of ninety degrees in either direction from the upright position. Locking means is provided to alternatively lock the bar in either the &#34;raised&#34; or &#34;lowered&#34; positions. To facilitate the setting of position, a cutout is provided in the opposite ends of the bar, this cutout having a projection therein and into which cutout a stop member which protrudes from each of the brackets is respectively fitted. Thus, the bar is normally locked in the raised position to hold the lights upright, but when it is necessary to enter a low clearance area such as a garage, the locking means is released and the bar rotated ninety degrees in either direction until the stop members of the brackets abut against the corresponding projections of the bar to bring the lights to the lowered position. The locking means is then adjusted to lock the bar to the brackets. 
     It is therefore an object of this invention to provide a mounting assembly for mounting lights across the top of a vehicle with which the lights can be rotated to a lowered position to provide clearance for the vehicle. 
     Other objects of the invention as the description proceeds in connection with the accompanying drawings, of which: 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a front perspective view of a preferred embodiment of the invention; 
     FIG. 2 is a side elevational view of the bracket of the embodiment of FIG. 1; 
     FIG. 3 is a cross sectional view taken along the plane indicated by 3--3 in FIG. 2; 
     FIG. 4 is a cross sectional view taken along the plane indicated by 4--4 in FIG. 3; and 
     FIG. 5 is a perspective exploded view illustrating the rotation stop mechanism of the preferred embodiment. 
    
    
     Referring now to the FIGURES, a preferred embodiment of the invention is illustrated. A plurality of lights 11 are fixedly mounted on support bar 12 which is supported between a pair of similar brackets 13a and 13b. The brackets are attached to opposite sides of vehicle 15 with bar 12 extending over the top of such vehicle. Bar 12 has end plates 12a which are attached to the opposite ends thereof by means of bolts 17 and nuts 18, these end plates having arcuate upright portions 19. Each of upright portions 19 has an arcuate cutout 19a formed therein and a projection 19b which extends into the cutout. 
     Each of brackets 13a and 13b has an end plate 21 attached to the end thereof by means of a bolt 22 and nut 23. Each bracket has an upright portion 21a with a flat surface which abuts against an opposing surface of the upright portion 19 of the end plate 12a of bar 12. A stop member 21b extends from upright portion 19, this stop member having opposite surfaces 21c which engage opposing surfaces 19c of end plate 19 when the bar is rotated in either direction. The combined widths of stop member 21b and projection 19b are preferably made so as to allow 90 degrees of rotation from the &#34;raised&#34; position in either direction. 
     Bar 12 is held firmly to brackets 13a and 13b in either the raised or lowered positions of lights 11 by means of bolts 30 operating in conjunction with nuts 33, washers 34 and apertured mounting plates 31 which have nuts 32 fixedly attached thereto as, for example, by welding. Thus, bolts 30 are tightened to firmly clamp the bar 12 to the brackets 13a and 13b to maintain lights 11 in the raised or upright position, as shown in FIGS. 1-4. When it is necessary to place the lights in a lowered position to provide clearance for the vehicle, bolts 30 are loosened to permit the clockwise or counterclockwise rotation of bar 12 (and the lights 11 mounted thereon) until the stop plates 21b abut against projections 19b, thereby bringing the lights to the lowered position, whereat bolts 30 are tightened to retain the bar and the lights in this position. In view of the fact that plates 31 are prevented from rotating by the walls of end plates 12a, the bolts 30 can readily be tightened and loosened by means of an appropriate screw driver or wrench inserted through apertures 35 formed in brackets 13a and 13b. 
     While the invention has been described and illustrated in detail, it is clearly to be understood that this is intended by way of illustration and example only and not to be taken by way of limitation, the scope of the invention being limited only by the terms of the following claims.