Abstract:
An LED road light has a heat sink embedded with an LED module, a base and a light pole holder assembly. The base, the heat sink and the light pole holder assembly are assembled by slidably and respectively mounting ribs into slots. Accordingly, the contact area of such engagement is relatively larger than that using screws, thereby enhancing combined strength and extending the life duration of the LED road light. Besides, the engagement mechanism using ribs and slots also provide workers a convenient and time-saving assembling process.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to an LED road light, and more particularly to an LED road light assembled by engagements between ribs and slots formed on parts of the LED road light. 
     2. Description of the Related Art 
     With low power consumption and bright luminance, LED road lights have gradually become the mainstream road lights. Despite power-saving, the high heat issue is still a problem of the LED lights. Currently, a large heat dissipation board additionally mounted to an LED road light is a main technical measure to tackle the issue, but it also gives rise to assembling problems. 
     With reference to  FIG. 6 , a conventional LED road light has a top cover  50 , a bottom cover  60  and an LED module  70 . 
     The top cover  50  has a lamp pole sleeve  51  and two upper wings  52 . The lamp pole sleeve  51  is formed on and protrudes from a rear end of the top cover  50 . The two upper wings  52  are respectively formed on and protrude downwardly from two sides of the top cover  50 . Each upper wing  52  has multiple through holes formed through the upper wing  52 . 
     The bottom cover  60  has two lower wings  61 , multiple light holes  612  and multiple screw holes  613 . The two lower wings  61  are respectively formed on and protrude upwardly from two sides of the bottom cover  60 . Each lower wing  61  has multiple through holes  611  formed through the lower wing  61 . When the top cover  50  is mounted on the bottom cover  60  and the through holes  521  of the upper wings  52  respectively align with the through holes  611  of the lower wings  61 , multiple bolts  80  are respectively mounted through the through holes  521 ,  621  to combine the top cover  50  and the bottom cover  60  together. The light holes  612  are formed through the bottom cover  60 . The screw holes  613  are formed through the bottom cover  60  and are adjacent to the light holes  612 . 
     The LED module  70  is mounted between the top cover  50  and the bottom cover  60  and has multiple LED strips  71 . The LED strips  71  are parallel with each other and each LED strip  71  has a hollow metal bar  711  and multiple LED elements  712 . The LED elements  712  are mounted in a bottom of the metal bar  711  and align with and respectively illuminate through the light holes  612 . Each LED element  712  aligns with at least one of the screw holes  613  and is fastened on the bottom cover  60  by screwing multiple screws  713  into the LED element  712  through the screw holes  613 . 
     As the LED module  70  of the conventional LED road light is combined with the bottom cover  60  with screws and the top cover is also fastened on the bottom cover by a screwing means, the conventional LED road light may be loosened and come off after a period of outdoor operation. Besides frequent maintenance, the risk of jeopardizing public safety is also high and the assembly of the conventional LED road light consumes labor-hours. 
     SUMMARY OF THE INVENTION 
     An objective of the present invention is to provide an LED road light assembled by using ribs and slots formed on parts of the LED road light and mounting ribs into corresponding slots to provide higher combined strength thereof and more convenient assembly process. 
     To achieve the foregoing objective, the LED road light a heat sink, an LED module, a base and a light pole holder assembly. 
     The heat sink has a top, a bottom, a light opening and multiple first sliding slots. The light opening is centrally formed through the heat sink. The first sliding slots are formed in the top of the heat sink. 
     The LED module is mounted to the light opening of the heat sink to illuminate downwardly through the light opening. 
     The base has a top, a bottom, multiple first sliding ribs and multiple second sliding slots. The first sliding ribs are formed on and protrude downwardly from the bottom of the base, and respectively align with and are slidably mounted in the first sliding slots on the top of the heat sink. The second sliding slots are formed in the top of the base. 
     The light pole holder assembly has a bottom and multiple second sliding ribs. The second sliding ribs are formed on and protrude downwardly from the bottom of the light pole holder assembly, and respectively align with and are slidably mounted in the second sliding slots on the top of the base. 
     The LED road light of the present invention employs ribs and slots formed on the base, the heat sink and the light pole holder to assembly those parts by slidably mounting the ribs into the corresponding sliding slots. Due to larger contact area of the engagement, the combined strength of the LED road light is relatively higher and thus results in more stable structure. Moreover, sliding mounting ribs into corresponding slots is convenient and time-saving for workers to assembly the LED road light. 
     Other objectives, advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is an exploded perspective view of a first embodiment of an LED road light in accordance with the present invention; 
         FIG. 2  another exploded perspective view of the LED road light in  FIG. 1 ; 
         FIG. 3  is a perspective view of the LED road light in  FIG. 1 ; 
         FIG. 4A  is a side view of the LED road light in  FIG. 1 ; 
         FIG. 4B  is a side view of a second embodiment of an LED road light in accordance with the present invention; 
         FIG. 5  is a cross-sectional side view of the LED road light in  FIG. 1 ; and 
         FIG. 6  is a partially exploded perspective view of a conventional LED road light. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     With reference to  FIGS. 1 to 3 , a first embodiment of an LED road light in accordance with the present invention has a heat sink  10 , an LED module  20 , a base  30  and a light pole holder assembly  40 . 
     The heat sink  10  has a concave profile and has a light opening  101 , multiple first sliding slots  11 ,  11   a , two first flanges  12  and multiple fins  102 . The light opening  101  is rectangular and centrally formed through the heat sink  10 . The first sliding slots  11 ,  11   a  are parallelly formed in a top of the heat sink  10 . The two first flanges  12  are respectively formed on and protrude horizontally from two opposite sides of the heat sink  10 . Each first flange  12  has multiple first through holes  121  formed therethrough. The fins  102  are formed on and protrude downwardly from a bottom of the heat sink  10 . Each first sliding slot  11 ,  11   a  may have a cross section in a shape of a part of a circle, a point angle, a square or a maple leaf as shown in  FIG. 4B . 
     The LED module  20  is mounted to the light opening  101  of the heat sink  10  to illuminate downwardly through the light opening  101 . The LED module  20  has two support brackets  21 , a lamp shade  22 , a fixing plate  23  and multiple LED elements  24 . The two support brackets  21  are respectively mounted on two opposite sidewalls of the rectangular light opening  101 . In the present embodiment, the two opposite sidewalls of the light opening  101  are slanted. Each support bracket  21  has a fixing bevel portion  211  and an L-shaped support portion  212 . The fixing bevel portion  211  is mounted on one of the slanted sidewalls. The L-shaped support portion  212  is formed on and protrudes downwardly from a bottom of the fixing bevel portion  211  to mount through the light opening  101 . The lamp shade  22  is mounted on the two support brackets  21 , is curved and made of a glass material and has two lamp flanges  221  respectively formed on and protruding horizontally from two opposite sides of the lamp shade  22 . Each lamp flange  221  is mounted on the L-shaped support portion  212  of one of the support brackets  21 . The fixing plate  23  is mounted on a bottom of the base  30 . The LED elements  24  are mounted on a bottom of the fixing plate  23 . 
     The base  30  has a concave profile and has multiple first sliding ribs  31 ,  31   a , multiple second sliding slots  32  and two second flanges  33 . The first sliding ribs  31 ,  31   a  are parallelly formed on and protrude downwardly from the bottom of the base  30  and are slidably and respectively mounted in the first sliding slots  11 ,  11   a . The second sliding slots  32  are formed in a top of the base  30 . Each first sliding rib  31 ,  31   a  may have a cross section in a shape of a part of a circle, a point angle, a square or a maple leaf as shown in  FIG. 4B . Each second sliding slot  32  may have a cross section in a shape of a part of a circle. The two second flanges  33  are respectively formed on and protrude horizontally from two opposite sides of the base  30 . Each second flange  33  has multiple second through holes  331  corresponding respectively to the first through holes  121  in a corresponding one of the first flanges  12  of the heat sink  10 . When the first sliding ribs  31 ,  31   a  are slidably mounted in the first sliding slots  11 ,  11   a  of the heat sink  10 , the base  30  and the heat sink  10  are combined together. At this time, the second flanges  33  are respectively stacked on the first flanges  12 . When each first through hole  121  aligns with one of the second through holes  331 , a screw is mounted through the first through hole  121  and is screwed into the second through hole  331 . 
     The light pole holder assembly  40  has a first sleeve  42 , a second sleeve  43  and a waterproof gasket  44 . The first sleeve  42  has multiple second sliding ribs  41  and two locking plates  421 . The second sliding ribs  41  are formed on and protrude downwardly from a bottom of the first sleeve  42  and slidably and respectively mounted in the second sliding slots  32  of the base  30 . The locking plates  421  are respectively formed on and protrude outwardly and obliquely from two sides of the bottom of the first sleeve  42  and are securely mounted on the top of the base  30 . One end of the second sleeve  43  is mounted around one end of the first sleeve  42  and serves to mount and fasten a light pole in the second sleeve  43 . The second sleeve  43  has multiple second sliding ribs  41  and two locking plates  431 . The second sliding ribs  41  are formed on and protrude downwardly from a bottom of the second sleeve  43  and slidably and respectively mounted in the second sliding slots  32  of the base  30 . The two locking plates  431  are respectively formed on and protrude outwardly and obliquely from two sides of the bottom of the second sleeve  43  and are securely mounted on the top of the base  30 . The waterproof gasket  44  is mounted and squeezed between the first sleeve  42  and the second sleeve  43 . 
     An assembling process of the rib insertion type LED road light in accordance with the present invention is described as follows. 
     The lamp shade  22  and the support brackets  21  of the LED module  20  are firstly inserted into the light opening  101  of the heat sink  10 . The first sliding ribs  31  on the bottom of the base  30  are respectively aligned with and inserted into the first sliding slots  11  on the top of the heat sink  10  to combine the base  30  with the heat sink  10 . Multiple screws are respectively mounted through the first through holes  121  of the first flange  12  and screwed into the second through holes  331  of the second flange  33  to further fasten the heat sink  10  with the base  30 . The second sliding ribs  41  on the bottoms of the first sleeve  42  and the second sleeve  43  are then respectively aligned with and inserted into the second sliding slots  32  on the top of the base  30  to combine the light pole holder assembly  40  with the base  30 . The locking plates  421 ,  431  on the top of the base  30  and the second sleeve  43  are screwed together to provide a stable combined strength between the base  30  and the light pole holder assembly  40 . 
     The assembly of the base  30 , the heat sink  10  and the light pole holder assembly  40  employs ribs  31 ,  31   a ,  41  and slots  11 ,  11   a ,  32  and mounts the ribs  31 ,  31   a ,  41  into the corresponding sliding slots  11 ,  11   a ,  32 . The contact area of such engagement is relatively larger than that by using screws, thereby enhancing the combined strength of the LED road light. Moreover, such assembly process of the rib  31 ,  31   a ,  41  and slot  11 ,  11   a ,  32  is convenient and time-saving to assemble the LED road light. 
     Even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and function of the invention, the disclosure is illustrative only. Changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.