Abstract:
An LED lamp assembly includes an LED lamp and a supporting member supporting the LED lamp. The LED lamp includes a plurality of LED modules and a heat sink supporting and cooling the LED modules. The supporting member includes a pair of supporting arms supporting the LED lamp and pivotably engaging with the heat sink of the LED lamp. The heat sink is rotatable relative to the supporting arms of the supporting member to vary an illumination angle of the LED lamp assembly.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to an LED lamp assembly, and more particularly to an LED lamp assembly having an LED lamp which is rotatable to assume various angles of illumination. 
     2. Description of Related Art 
     The technology of light emitting diodes has rapidly developed in recent years from indicators to illumination applications. With the features of long-term reliability, environment friendliness and low power consumption, the LED is viewed as a promising alternative for future lighting products. 
     A conventional LED lamp comprises a heat sink and a plurality of LED modules having LEDs attached to an outer surface of the heat sink to dissipate heat generated by the LEDs. The outer surface of the heat sink generally is a plane and the LEDs are arranged close to each other. When the LED lamp works, the LEDs mounted on the planar outer surface of the heat sink only form a flat light source. However, once the LED lamp is fixed under a determined circumstance, a direction of a light emitted by the LED lamp cannot be changed to meet different requirements. Generally, when it is necessary to change the illumination direction, the LED lamp must be remounted or redesigned, which is unduly time-consuming and raises production costs. 
     Thus, it is desired to devise a new LED lamp assembly having an LED lamp whose illumination angle is adjustable to meet different requirements. 
     SUMMARY OF THE INVENTION 
     An LED lamp assembly includes an LED lamp and a supporting member supporting the LED lamp. The LED lamp includes a plurality of LED modules and a heat sink supporting and cooling the LED modules. The supporting member includes a pair of supporting arms supporting the LED lamp and pivotably engaging with the heat sink of the LED lamp. The heat sink is rotatable relative to the supporting arms of the supporting member to vary an illumination angle of the LED lamp assembly. 
     Other advantages and novel features will become more apparent from the following detailed description of preferred embodiments when taken in conjunction with the accompanying drawings, in which: 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Many aspects of the present embodiments can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present embodiments. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views. 
         FIG. 1  is an assembled view of an LED lamp assembly with an LED lamp in accordance with a preferred embodiment of the present invention; 
         FIG. 2  is similar to  FIG. 1 , wherein the LED lamp rotates to a specifically determined angle; 
         FIG. 3  is an exploded view of  FIG. 1 ; and 
         FIG. 4  is similar to  FIG. 3 , but viewed from a different aspect. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Referring to  FIGS. 1-2 , an LED lamp assembly in accordance with a preferred embodiment of the present invention comprises an LED lamp  10 , a supporting member  30  supporting the LED lamp  10  and a fixture  50 . The supporting member  30  is mounted on the fixture  50 . A driving circuit module (not shown) is received in the fixture  50  to electronically connect with the LED lamp  10 . In addition, a supporting post (not shown) is connected to the fixture  50  to support the LED lamp assembly at a desired position. 
     Referring to  FIGS. 3-4  also, the LED lamp  10  comprises a plurality of LED modules  12 , a heat sink  11  supporting and cooling the LED modules  12 , a reflector  13  mounted on the heat sink  11  and spanning the LED modules  12 , a transparent envelope  15  attached to the heat sink  11  and covering the reflector  13  and the LED modules  12  and a ring  14  pressing the envelope  15  toward the heat sink  11 . 
     The heat sink  11  is supported by the supporting member  30 . The heat sink  11  has a disc-shaped configuration, and is integrally made of aluminum. The heat sink  11  comprises a base  110  and a heat dissipating member  112  enclosing the base  110 . The base  110  has a planar bottom surface (not labeled) for mounting the LED modules  12  and a top surface (not labeled) opposite to the bottom surface. The heat dissipating member  112  comprises a pair of arc-shaped sidewalls (not labeled) extending downwardly from opposite edges of the base  110 . A pair of trapeziform mounting members  114  are located at opposite sides of the heat dissipating member  112  and connect with the sidewalls of the heat dissipating member  112 . A thickness of each mounting member  114  is larger than that of the sidewall of the heat dissipating member  112 . A plurality of fins  1121  is radiately mounted on the top surface of the base  110  and extends outwardly from the sidewalls of the heat dissipating member  112  to dissipate heat generated by the LED modules  12 . 
     Each LED module  12  comprises an elongated printed circuit board  120  and a plurality of spaced LEDs  122  evenly mounted on a side of the printed circuit board  120 . The LEDs  122  of each LED module  12  are arranged along a longitudinal direction of the printed circuit board  120 . The LED modules  12  are equidistantly mounted on the bottom surface of the base  110  of the heat sink  11 . 
     The reflector  13  is used to reflect light emitted by the LEDs  122  of the LED modules  12 . The reflector  13  is an oval plate and defines a plurality of through holes  130  at a centre thereof. The LEDs  122  are received in the through holes  130 . A plurality of screws (not shown) extends through the reflector  13  and engages with the base  110  of the heat sink  11  to mount the reflector  13  on the heat sink  11 . 
     The envelope  15  is made of transparent glass or plastic. The envelope  15  comprises an oval transparent plate  152  and a mounting portion  150  extending from the plate  152 . The ring  14  presses the envelope  15 . A plurality of screws extends through the ring  14  and the mounting portion  150  of the envelope  15  to threadedly engage in the sidewalls and the mounting members  114  of the heat sink  11  to thereby mount the envelope  15  on the heat sink  11 . 
     The supporting member  30  has a V-shaped configuration. The supporting member  30  is formed by a pair of V-shaped supporting portions  31 . Each supporting portion  31  comprises a hollow, semi-circular connecting portion  310  and a pair of arc-shaped extending portions  312  extending slantwise and upwardly from opposite sides of the connecting portion  310 . Each extending portion  312  defines a groove (not shown) at a centre thereof to receive wires (not shown) extending from the driving circuit module. The connecting portions  310  of the supporting portions  31  are oriented towards each other and mounted on the fixture  50 . A plurality of screws (not labeled) extends through the extending portions  312  of the supporting portions  31  to assemble the extending portions  312  together; thus, a pair of supporting arms  33  are formed. The supporting arms  33  are symmetrical to each other relative to a central axis of the supporting member  30 . The LED lamp  10  is supported by the supporting arms  33  of the supporting member  30 . One of the supporting arms  33  defines a through hole  32  at a top thereof. The through hole  32  communicates with grooves of the extending portion  312 . Wires of the driving circuit module extend in the supporting arm  33  and leave therefrom via the through hole  32  to enter the LED lamp  10  to electronically connect with the LED modules  12 . 
     A pair of fasteners  60  extend through the supporting arms  33  of the supporting member  30  and the mounting members  114  of the heat sink  11  to assemble the LED lamp  10  and the supporting member  30  together. The fastener  60  comprises a head  61  and an elongated shaft  63  perpendicularly extending from the head  61 . The shaft  63  terminates with a screwed end (not shown). When assembled, the screwed end of each of the shafts  63  screws into a corresponding mounting member  114  in a manner that the LED lamp  10  can be rotated relative to the supporting member  30  to change the illumination angle of the LED lamp  10 . Once the illumination angle is determined, the fasteners  60  are further rotated to firmly engage with the mounting members  114  to make the LED lamp  10  be securely mounted on the supporting member  30 . Thus, the LED lamp assembly is assembled together and the LED lamp  10  is oriented at the required direction. 
     It is believed that the present embodiments and their advantages will be understood from the foregoing description, and it will be apparent that various changes may be made thereto without departing from the spirit and scope of the invention or sacrificing all of its material advantages, the examples hereinbefore described merely being preferred or exemplary embodiments of the invention.