# US 4,396,860 A · Electric lamp with a sleeve-shaped cap

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- Number: US 4,396,860 A
- Document ID: US4396860A
- Status: Granted
- Kind: A
- Application number: 06/175,630
- Filed: 1980-08-06
- Granted: 1983-08-02
- Earliest claimed: 1979-08-11
- Assignees: U.S. Philips Corporation
- Inventors: Paul Hellwig; Werner Schlagheck
- Web page: https://patentgrep.com/patent/US4396860A

## CPC

- H01K 1/46: supported by a separate part, e.g. base, cap
- H01K: ELECTRIC INCANDESCENT LAMPS (details, apparatus or processes for manufacture applicable to both discharge devices and incandescent lamps H01J; light sources using a combination of incandescent and other types of light generation H01J61/96, H05B35/00)

## Abstract

In an electric lamp with a sleeve-shaped cap and an inner sleeve carrying the bulb, the cap has at least two lugs protruding inwards and the inner sleeve is provided with at least two slots on its cylindrical sheath, which engage the lugs.

## Claims

### Claim 1

An elongated electric lamp having an axis which comprises: a bulb, a sleeve-shaped cap, and a cylindrical inner sleeve carried in said sleeve-shaped cap, said cylindrical inner sleeve having first and second axial extremities and carrying said bulb at said first axial extremity, said sleeve-shaped cap having at least two lugs extending inwardly, said cylindrical inner sleeve having at least two slots extending in the direction of said lamp axis, said slots opening into said second axial extremity of said inner sleeve and engaging said lugs.

### Claim 2 (depends on 1)

A lamp as claimed in claim 1, wherein said lugs are formed in the shape of protrusions pushed inwards from the metal wall of the cap.

### Claim 3 (depends on 1)

A lamp as claimed in claim 1, or 2, wherein said slots are elongated and are wider at said axial extremity than elsewhere along the axial extent thereof.

### Claim 4 (depends on 1, 2)

A lamp as claimed in claim 1 or 2, wherein said slots have resilient edges which are pressed apart by said cap lugs during insertion of said cylindrical inner sleeve into said sleeve-shaped cap, and in the assembled position of said cylindrical inner sleeve are in compression behind said lugs.

### Claim 5 (depends on 4)

A lamp as claimed in claim 4, in which said resilient edges which are bent inwardly.

### Claim 6 (depends on 4)

A lamp as claimed in claim 4, wherein said slots are elongated and are wider at said second axial extremity than elsewhere along the axial extent thereof.