Abstract:
An outdoor lighting device having an upper cover, a lower cover and lighting tubes installed in the lower cover is disclosed. The upper cover has three wave-like raised section formed with a multiple slits for ventilation. Each lighting tube has two end spindles formed with teeth and the lower cover has a fence built and surrounded inside to form a drainage trench and the fence has a plurality of semi-cylindrical seats with racks on two opposite sides matching with said teeth so that the projecting angle of the lighting tube can be adjusted against the racks. The lighting tubes attached with heat dissipation fins on their back side, and the plane normal of heat dissipation fins in parallel with the two end of the lighting tube.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    1. Field of the Invention 
         [0002]    The present invention relates to a lighting device, particularly one designed to be used as street lamps or outdoor LED (Light Emitting Diodes) lighting devices. 
         [0003]    2. Description of the Prior Art 
         [0004]    Conventional street lamps are mostly either halogen or mercury lamps attached on the bent end of a lamp post. The lamp apparatus usually contains one or more than one halogen lamp or light emitting component, along with a reflector shield to reflect light emitted therefrom in order to achieve the desired illumination. 
         [0005]    The conventional lamps, in general, consume more energy and expect shorter service life than LED lamps do. 
         [0006]    The light beams of LEDs are known to have more condensed than do conventional light sources. But until recently, the luminosity of LEDs has been pretty limited, thus confining their use to such devices as signal lights, tail lights of vehicles, decorative lights, etc., which requires relatively low brightness. fortunately, with the invention of blue light LED, and prices of LED steep depreciation, both of them prompt the development of the high brightness white light LED and their related applications. Particularly in the nowadays, when reducing energy consumption and carbon emission has become a major world issues. Governments around the world are encouraging people to replace their incandescent lighting with LED lighting, which is expected to become the mainstream of the market in the foreseeable future. Also called cold-cathode, LEDs are so different from conventional incandescent lights. They consume less energy and, longer service life e.g. several tens of thousands of hours if they get adequate heat dissipation during lighting. By contrast, incandescent light bulbs usually last only about one thousand hour, while compact fluorescent bulbs, although lasting a bit longer, can only last up to a few thousand hours. 
         [0007]    Unfortunately, the power of a single LED, even a so called high-power or high-brightness one, is usually a few watts only; the lighting generated is thus far from being adequate for most illumination needs. As a result, LED lighting devices often have tens of LEDs crowed in an rectangular array or a circular array mounted on predetermined curved board at in several light tube (light bars) side by side and with each light tube usually consisting of ten or more LED chips in several rows 
         [0008]    One can easily imagine that, with tens of LED chips crowded in a closed space, the LEDS will soon suffer from overheating and even premature degradation. To avoid that, larger plane area or space to position the LED chips than that of conventional lighting devices is usually required. Besides, most LED lighting devices are designed for indoor use only. They do not take such natural ambient factors as rain, storms, snows, sands, gusts, etc., into consideration. By contrast, outdoor lighting devices such as street lamps, road lights, traffic signal lights, etc., all have to be able to withstand gust, heavy-rain, sandstorms, blizzards, and earthquakes . . . etc., 
         [0009]    Furthermore, outdoor lighting devices are not for lighting only, it can be an ornament thus has to take visual aesthetics of the whole street into consideration. 
         [0010]    As is depicted above, an objective of the present invention is to provide a LED street lighting device that can: withstand windstorm, heavy-rain, sandstorm, blizzards, snowstorms and earthquakes etc., and allows easy adjustment of its light projecting angle in accordance with the requirements of its environment, and easy to maintain. Hence, to achieve the above aims, the street lighting device must be robust enough to resist the aforementioned elements, with adequate heat dissipation capability to prevent the LEDs&#39; from light degradation, and with such modulized structure design as to provide for easy maintenance. Also, the lighting capacity of the LED street light must be able to conform to the road safety standards set by governments. 
       SUMMARY OF THE INVENTION 
       [0011]    The present invention disclosed an outdoor lighting device having an upper cover, a lower cover and lighting tubes installed in the lower cover is disclosed. The upper cover has three wave-like raised section formed with a multiple slits for ventilation. Each lighting tube has two end spindles formed with teeth and the lower cover has a fence built and surrounded inside to form a drainage trench having two drain holes formed therein and the fence has a plurality of semi-cylindrical seats with racks on two opposite sides matching with the teeth so that the projecting angle of the lighting tube can be adjusted against the seat. The lighting tubes attached with heat dissipation fins on their back side, and the plane normal of heat dissipation fins in parallel with the two end of the lighting tube. 
         [0012]    Atop two lighting tubes at the central portion, there is a bridge for supporting a power supply so that the power supply does not occupy the plane area of the lighting device. 
         [0013]    The lower cover further comprises a sleeve outside of the lower cover housing with two curved jaws. The outdoor lighting device can be fixed on one end of lamp post by the curved jaws. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0014]    The foregoing aspects and many of the attendant advantages of this invention will become more readily appreciated as the same becomes better understood by reference to the following detailed description, when taken in conjunction with the accompanying drawings, wherein: 
           [0015]      FIG. 1A  is the explosive view of lighting device of the present invention; 
           [0016]      FIG. 1B  shows the detailed feature of the light tube support according to the present invention; 
           [0017]      FIG. 2  is the three dimensional view of the light tube module according to the present invention; 
           [0018]      FIG. 3  shows the structure of the light tube module according to the present invention; 
           [0019]      FIG. 4  is the cross-sectional structural viewing from the sleeve according to the present invention. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0020]    The present invention provides an innovative outdoor lighting device able to withstand windstorms, blizzards, rainstorms, sandstorms, earthquakes etc., and easily to adjust its light distribution so as to meet the needs of the surroundings. 
         [0021]      FIG. 1  shows an exploded diagram of the LED light device  100  in accordance with the present invention. In  FIG. 1 , the LED light device  100  comprises an upper cover  102 , a plurality of lighting tubes  10 , and a lower cover  103 . The function of the upper cover  102  is to prevent dust, rain, snow, etc., from directly contacting the lighting tubes  10 . As the upper cover will somewhat reduce the heat dissipation capability. The upper cover  102  is made with three raised-up wave-like sections on which multiple slits patterns are formed therein and on all sides, as is shown on  1021 ,  1022 ,  1023 ,  1024  of  FIG. 1A , to facilitate the heat dissipation of the LEDs. The surface of the section in the middle is particularly raised up to form a hollow to house a power supply  70 . These multiple slits patterns allow the night wind to get into the housing and take away the heat of the heat dissipation fins of the light tubes, effectively cooling down the tubes. Both the multiple slits patterns on the surfaces of the upper cover and the raised contours of the three surface sections serve to enhance air convection capability, with the raised contours being instrumental in improving the rigidity of the cover, preventing the much hollowed out area from weakening its surface structure. Conventional lighting devices usually have to put their power supply sources in front or behind, thus limiting the length of their lighting tubes. This is not the case with the present invention, which can put its power supply on a bridge over the light tubs but inside the lower cover, as is shown in  FIG. 1A . 
         [0022]    Another advantage of the extra-raised middle section of the upper cover is that winds from any direction can go into the housing without any obstruction, which is tantamount to creating a windward slope. 
         [0023]    Of course, with outdoor LED lighting devices, the more ventilation the better the heat dissipation. But the openings created by these multiple slits patterns also allow rain and dust to come through, affecting the quality and service life of the light tubes. Thus such LED devices must have the capability to protect its LED components against water, prevent dust from gathering, which will affect heat dissipation capability of the LED lighting device, and even resist corrosion. 
         [0024]    To address the above problem, the present invention adopts a unique structure. Please refer to  FIG. 1 , there are a plurality of light tubes that are long in shape with heat dissipation fins like bat-wings. Please also note that the orientation of the slits on the upper cover&#39;s hollow-out surface is parallel to the orientation of the heat dissipation fins  40  (that is, perpendicular to the plane normal of the heat dissipation fins  40 ). 
         [0025]    Please also refer to  FIG. 2 , the three dimensional view of the light tubes. A plurality of heat dissipation fins  40  are set on the hulls of the light tubes perpendicular to the axle line of the tubes (i.e, the axle line is parallel to the surface normal of the heat dissipation fins  40 ). The advantage of such a design is that the drainage routes for dust or even bird excrement are shorter than that of heat dissipation fins in parallel with axle line of the light tubes.&#39; 
         [0026]    On the flat surface of the hull inside light tube, a LED aluminum base module is installed and fastened with a plurality of screws  16 . The LED module comprises a piece of PC board, a plurality of LED chips and with lens atop them. 
         [0027]    Meanwhile, on both ends of the light tubes  10  there are adjustment spindles  25 , by means of a plurality of teeth  20  facing the ground, as show in  FIG. 2 . 
         [0028]    Please turn back to  FIG. 1 . At the front end of the lower cover  102  there is a sleeve  110  formed thereon for LED device fixed on the post. An inner wall of fence inside the periphery of the lower cover  102  has support/seats  23  for light tubes. The supports/seats  23  are shaped like upward curves and featured with racks on the bottom to match with the teeth of the adjustment spindle  23  so that the light tubes  10  can be adjusted as needed. Once the adjustment of the position angle of the light tubes  10  is done, the adjustment spindle  25  will be fixed with fastener sets  12  and fastened with screws  13 . The locker  12   a  of the fastening set  12  will lock the spindle  25  tightly in place. 
         [0029]    On the outer periphery of the lower cover  102 , a ring of drainage trench  128  is structured to direct residual rainwater to drain out through sleeve  110 .  FIG. 3  shows the bottom view of the present invention, after the light tubes  10  are installed on the lower cover, wherein near the rear end of the aforesaid sleeve  110  there are two water draining openings  136 , through which residual rainwater collected by the drainage trench  128  can be drained out. There are also gaps (corresponding to the aforementioned multiple slits patterns  1021 - 1024 ) between each and every of the light tubes  10  to make room for rain, dust, and air convection 
         [0030]    The pattern on the pan-handle part of the device, on the other hand, makes room for the light tubes  10 , preventing surfaces of the lights from directly contacts working table during the assembling process 
         [0031]    As shown in  FIG. 1A  and  FIG. 4 , the sleeve  110  is fastened on the bent end of the lamp post via the two vise jaws inside it: the upper jaw  120  and the lower jaw  130 . There is one drainage opening  134  in the area the lower jaw  130  touches the sleeve  110 , whereas inside the lower jaw  130  there is another drainage opening  135 . Residual rainwater collected by the drainage grooves  128  can be drained out through the openings  136 ,  134 , and  135 . Besides, there are also uneven grooves on both the upper jaw and lower jaw to direct water to flow from high to low (in relation to the ground after the present invention is mounted on a lamp post) and to eventually drain out. 
         [0032]    A bridge  65  is structured above the heat dissipation fins  40  of the two light tubes  10 , whereas power supply  70  is positioned upon the bridge  65 . Both the bridge  65  and the power supply  70  are placed in the hollow of the raised middle section of the upper cover. As the power supply is situated in a central position, wiring can be shortened. 
         [0033]    The present invention has the following features and advantages: 
         [0034]    1. The bottom of the lower case is a flat surface, not a curved one. However, each of the light tubes of the device can be adjusted for light shedding angle to ensue no grey area between too lamp post. 
         [0035]    2. After each LED tube is fine-tune adjusted, it is locked tight in position, unless unfastened to re-adjust the light shedding angle, enabling it to withstand even the fiercest strong winds. 
         [0036]    3. The light tubes are long in shape and have a plurality of fins like bat-wings. The plane normal of the heat dissipation fins is in parallel rather than perpendicular to the axle line of the tubes so that the drainage routes are shorter. 
         [0037]    4. Outside the lower cover a sleeve which is an integrated part of it, and it housing two curved jaws to fasten the light device on an end of the lamp post. The upper cover comes with three raised surfaces with hollowed out patterns. Thus the whole unit not only allows the night wind to get into the housing and take away its heat, but can also withstand strong winds. 
         [0038]    5. The extra-raised middle section of the upper cover not only provide sufficient housing space for the power supply, allowing more room for laying out light tubes than do conventional lighting devices. Also, this raised section with multiple slits patterns invites winds from all directions, which is helpful to the heat dissipation of the light tubes, tantamount to creating a windward slope. 
         [0039]    As is understood by a person skilled in the art, the foregoing preferred embodiment of the present invention is an illustration, rather than a limiting description, of the present invention. It is intended to cover various modifications and similar arrangements included within the spirit and scope of the appended claims, the scope of which should be accorded the broadest interpretation so as to encompass all such modifications and similar structures.