Patent Publication Number: US-6043593-A

Title: Insulated structure of a light bulb assembly

Description:
BACKGROUND OF THE INVENTION 
     In prior art, a light bulb assembly of a light string, when it is used outdoors, must be waterproof to prevent from infiltrating water or moisture. The known structure of the light bulb assembly including a bulb holder with a bulb and a housing is not effective for obtaining a perfect sealed connection. The water or moisture would be infiltrated in the housing and contacts with two conductive wires at the same time that becomes a short circuit and damages the light bulb assembly. It is a main drawback to be overcome. 
     OBJECT OF THE INVENTION 
     The main object of the present invention is to provide an improved insulated structure of a light bulb assembly, which includes an improved bulb holder with a connecting beam and a related designed housing for receiving the holder to obtain a perfect insulation. 
     The detailed structure, features, and other advantages of this invention will become apparent from the following detailed description of a preferred embodiment when read with reference to the accompanying drawings. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a perspective view of a light bulb assembly according to the present invention. 
     FIG. 2 is an exploded perspective view of a light bulb assembly according to the present invention. 
     FIG. 3 is a top plan view of FIG. 1. 
     FIG. 4 is a top plan view of the bulb holder connected with the bulb according to the present invention. 
     FIG. 5 is a cross sectional view of FIG. 1. 
     FIG. 6 is a partly cross perspective view of the housing according to the present invention. 
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENT 
     Please refer to FIGS. 1 to 2, a bulb (3) is engaged within a bulb holder (1) and received in a housing (2), as a prior art. The holder (1) is provided with a connecting beam (11) being received in the housing (2). It is a characteristic of the present invention that the designed configuration of the connecting beam (11). Referring to FIG. 4, there are two lower steps (12) provided on two sides of the beam (11). Two sides above the steps (12) of the beam (11) are continual zigzag surfaces (111) while the other two sides are arched surfaces (112). The lower step (12) has a configuration that the outer width is larger than the inner width. As shown in FIGS. 3-6, the housing (2) has an inner hole (21) being similar to the configuration of the bulb holder (1) with the beam (11) and the steps (12). 
     After the engagement of the holder (1) and the housing (2), there will be a perfect sealed connection between the holder (1) and the housing (2). In use, the rain or water will never be infiltrated into the housing (2) because of the connection between the continual zigzag surfaces (111) and the inner surfaces of the inner hole (21) of the housing (2). Even if the moisture is infiltrated, it will be insulated from the other side of the connecting beam (11). It will be understood that the connecting beam (11) and the steps (12) of the present invention can provide a complete insulation that the water or moisture will never be infiltrated to another side of the beam and that promises a secure use of the light bulb assembly.