1. Field of the Invention
The present invention relates to a lamp, and in particular to a lamp holder for connecting a bulb.
2. Description of Prior Art
Taiwan Patent Publication No. M258232 discloses a conventional lamp holder, which includes an outer connecting piece, an inner connecting piece and an insulating ring. The outer connecting piece is made of a metallic material such as copper and partially covers the outer surface of the insulating ring. The outer peripheral surface of the outer connecting piece is formed with an outer thread. The inner connecting piece and the outer connecting piece are separated from each other and are connected to the center of the top of the insulating ring. With the inner connecting piece and the outer connecting piece being welded with an inner filament and an outer filament of the bulb respectively, the assembly of the bulb and the lamp holder can be achieved.
However, in practice, the above-mentioned conventional lamp holder still has some problems as follows. Since the outer thread of the outer connecting piece is connected to the inner thread (not shown) of the lamp socket via full circles of rotation, the wear caused by the friction between the outer thread and the inner thread is so large that the contact therebetween may become poor after several times of rotation. Furthermore, there is a number of constituent components, so that the manufacture cost and material cost of those components are increased. Also, a large amount of labor hours should be spent to assemble the conventional lamp holder. On the other hand, the inner connecting piece and the outer connecting piece cannot withstand high temperature very well. Therefore, after operating continuously for a long time, the inner connecting piece and the outer connecting piece may be overheated to suffer damage, which lowers the lifetime thereof.
Therefore, it is an important issue to overcome the above-mentioned problems in prior art.
The present invention is to provide a ceramic lamp holder, in which a conductive terminal is received in a trough of a cylinder. In this way, when the cylinder is rotated into a lamp socket, the wear caused by the friction between the conductive terminal and the lamp socket can be reduced, thereby increasing the contact effect and lifetime.
The present invention is to provide a ceramic lamp holder for connecting a bulb and communicating with a filament of the bulb, which includes a cylinder and a conductive terminal. The cylinder is made of a ceramic material with its one side formed into a closed end. The closed end is provided with a through hole for allowing one end of the filament to pass through. The outer surface of the cylinder is formed with an outer thread and a trough recessed into the surface of the outer thread. The conductive terminal is fixedly received in the trough to be partially exposed to the outer surface of the outer thread. One end of the conductive terminal is connected to the other end of the filament.
The present invention is to provide a ceramic lamp holder, in which the cylinder is made of a ceramic material that can withstand a higher temperature and dissipate the heat of the filament or bulb quickly, thereby increasing the lifetime of the bulb.
The present invention is to provide a ceramic lamp holder, which is simple in structure and can be assembled easily. Furthermore, the present invention can reduce the material cost and the manufacture cost substantially.
The detailed description and technical contents of the present invention will be explained with reference to the accompanying drawings. However, the drawings are illustrative only, but not used to limit the present invention.
Please refer to
The cylinder 10 is made of a ceramic material and is formed into a circular shape. Both sides of the cylinder 10 are formed into a conical closed end 11 and an open end 12. The center of the closed end 11 is provided with a through hole 13 (
The conductive terminal 20 is made of a metallic material having good electric conductivity (such as copper). The conductive terminal 20 is constituted by an upright conducting section 21 and two fixing sections 22, 23 extending vertically respectively from both ends of the conducting section 21. The lower portion of the conducting section 21 protrudes to form a conducting point 24. The distal end of each fixing section 22, 23 is bent inwardly to form a hook 25, 26 respectively. The conductive terminal 20 is received in the trough 16 with the fixing sections 22, 23 penetrating into the fixing holes 17, 18 respectively. In this way, the hooks 25, 26 are fixed to the inner wall of the cylinder 10 respectively while the conducting point 24 is exposed to the outer peripheral surface of the outer thread 15.
According to the above, the ceramic lamp holder of the present invention already has industrial applicability, novelty and inventive steps. Furthermore, the structure of the present invention has not been seen in products of the same kind or put into public use. Therefore, the present invention conforms to the requirements for a utility model patent.
Number | Date | Country | Kind |
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096215478 | Sep 2007 | TW | national |