US3795887A

US3795887A - Base for annular lamp

Info

Publication number: US3795887A
Application number: US00290582A
Authority: US
Inventors: N Higuchi
Original assignee: Matsushita Electronics Corp
Current assignee: Panasonic Holdings Corp
Priority date: 1971-09-20
Filing date: 1972-09-20
Publication date: 1974-03-05
Anticipated expiration: 1991-03-05
Also published as: DE2245365B2; NL151550B; NL7212665A; DE2245365C3; CA961544A; GB1371836A; DE2245365A1; JPS4842373U; FR2154113A5

Abstract

A base for an annular lamp comprising a pair of semicylindrical members and base pins upstanding from one of these members. Each base pin is provided with an axial slit for holding therein an external lead of a glass bulb.

Description

llnite Ti States atent Higuchi Mar. 5, 1974 BASE FOR ANNULAR LAMP [56] References Cited [75] Inventor: Noriyasu Higuclhi, Takatsuki, Japan UN ED STATES PATENTS Assigneec Matsushita Electronics Corporation, Gilbert, Jl" Kadoma-shi, Osaka, Japan 7 Primary Examiner-James W. Lawrence Filedl p 1972 Assistant Examiner-Wm. H. Punter [21] APP] No: 290,582 Attorney Agent, or Firm-Ladas, Parry, VonGehr Goldsmith & Deschamps Sept. 20, 1971 Japan 46-86166 A base for an annular p Comprising a p of Semi cylindrical members and base pins upstanding from 2% 8 g k one of these members. Eachbase pin is provided with E 5 i 4 7 an axial slit for holding therein an external lead of a glass bulb.

2 Claims, 3 Drawing Figures BASE FOR ANNULAR LAMP This invention relates to improvements in the structure of bases for annular lamps.

The structure of prior art bases for annular lamps has been such that leads are passed through hollow metal pins erected on the base and are led outwardly to be connected at their external portion to the hollow metal pins by means such as soldering or electric welding. Because of such a structure, very troublesome work has been required for mounting the base on the glass bulb and this has been a hindrance to improvements in the efficiency of assembling the annular lamp.

With a view to obviate the prior art defect above described, it is a primary object of the present invention to eliminate the step of connection between hollow metal pins and leads by soldering, electric welding or like means in the prior art bases for annular lamps and to provide an improved base for an annular lamp which can be assembled by remarkably simplified steps.

The above and other objects, features and advantages of the present invention will be apparent from the following description of a preferred embodiment thereof taken in conjunction with the accompanying drawing, in which:

FIG. I is a perspective view of one of a pair of semicylindrical members constituting a base for an annular lamp embodying the present invention;

FIG. 2 is a sectional view of the base in the state in which it is mounted on an annular lamp; and

FIG. 3 is a section taken on the line II II in FIG. 3.

Referring to FIG. 1, a metal ring 2 is provided at each end of a glass bulb 1 of an annular lamp. A base according to the present invention includes a pair of first semicylindrical member 3 and a second semicylindrical member 7 of material such as synthetic resin.

Four metal rods 4 of material such as brass or nickelplated brass are fixed at one end of the inner wall of the first semicylindrical member 3 although only two of them are shown in FIG. 1. The metal rods 4 are circular in cross section and extend externally to the lamp to be inserted at the other end thereof in a socket (not shown) for the supply of current to the lamp therethrough. An axial slit 5 extends from the top to a portion adjacent to the lower end of each metal rod 4 as seen in FIG. 1. External leads 6 are connected electrically to filament coils (not shown) and are held at the end portion thereof in the respective slits 5 of the metal rods 4. Referring to FIGS. 2 and 3, the second semicylindrical member 7 is provided at its upper portion with four spaced perforations 8 whose diameter is substantially equal to the outer diameter of the metal rods 4. Therefore, when the first semicylindrical member 3 is assembled with the second semicylindrical member 7 at the gap between the opposite ends of the bulb l, the four metal rods 4 upstanding from the inner wall of the first semicylindrical member 3 fit in and extend through the four perforations 8 respectively of the second semicylindrical member 7 and these perforations 8 act to apply fastening pressure to the metal rods 4 provided with the slits 5. The first and second

semicylindrical members

3 and 7 may then be secured to each other as by screws.

With such a structure, the base comprising the first and second

semicylindrical members

3 and 7 and the metal rods 4 is mounted on the glass bulb l in the manner described below. At first, the leads 6 are fitted in the respective slits 5 of the metal rods 4 upstanding from the inner wall of the first semicylindrical member 3, and then the second semicylindrical member 7 is mounted on the first semicylindrical member 3 while allowing the free ends of the metal rods 4 on the first semicylindrical member 3 to extend through the perfo rations 8 of the second semicylindrical member 7. When the base is mounted on the glass bulb l in this manner, the leads 6 fitted in the slits 5 of the metal rods 4 are fastened by the fastening force of the metal rods 4 due to the resiliency thereof, and the slits 5 of the metal rods 4 are narrowed by the fastening effect of the perforations 8 of the second semicylindrical member 7 to prevent escapement of the leads 6 from the slits 5 of the metal rods 4.

One may consider that the base according to the present invention may include a problem of ma]- contact since the electrical contact between the leads 6 and the metal rods 4 is attained merely by fitting the leads 6 in the slits 5 of the metal rods 4. By making the space of the slits 5 slightly smaller in width than the diameter of the leads 6, said leads 6 are suitably supported in said slits 5 by means of the resiliency of the metal rods 4. However, the perforations 8 in the second semicylindrical member 7 may make smaller in diameter than the outer diameter of the metal rods 4 so as to impart the fastening pressure to the metal rod 4 after assembling of the base, so that the leads 6 are secured to the metal rods 4 since the space of the slits are narrowed. The inventor manufactured many bases according to the present invention and mounted these bases on glass bulbs to complete annular lamps. The results of a life test carried on the annular lamps proved that the lamps are entirely free from any mal-contact.

It will be understood from the foregoing description that the present invention can remarkably simplify the assembling of annular lamps due to the fact that no connection step between the leads and the metal pins as by soldering or electric welding as in the prior art process is required after the assembling of the first and second cylindrical members.

Further, due to the fact that the metal rods projecting outwardly from the base are provided with the slits, the metal rods can be easily inserted into a socket by the resiliency and a good electrical contact can also be ensured.

What is claimed is:

l. A split base for an annular lamp bulb comprising a first semicylindrical member and a second semicylindrical member adapted to hold the opposite ends of an annular bulb by bridging across the gap between such ends, and a plurality of metal rods fixed at one end thereof to the inner wall of said first semicylindrical member, said metal rods being adapted to be received through perforations formed in the side wall of said second semicylindrical member, and each said metal rod being provided with an axial slit for holding therein an external lead of said bulb.

2. A base as claimed in claim 1, wherein the perforations formed in the side wall of the second semicylindrical member are sized so as to impart fastening force to the metal rod thereby narrowing said slits.

Claims

1. A split base for an annular lamp bulb comprising a first semicylindrical member and a second semicylindrical member adapted to hold the opposite ends of an annular bulb by bridging across the gap between such ends, and a plurality of metal rods fixed at one end thereof to the inner wall of said first semicylindrical member, said metal rods being adapted to be received through perforations formed in the side wall of said second semicylindrical member, and each said metal rod being provided with an axial slit for holding therein an external lead of said bulb.