Method to manufacture glow plugs, particularly to secure glow el

Details Method to manufacture glow plugs, particularly to secure glow el Method to manufacture glow plugs, particularly to secure glow el

1977-01-13

1978-05-09

Larson, Lowell A.

Metal working

Method of mechanical manufacture

Electrical device making

29525, 219267, 123179H, 361266, H05B 300

Patent

active

040879046

ABSTRACT:
A thin-walled closed metal sleeve in which a heating wire is placed is attached in a socket which is formed with a bore with a carefully smoothly finished inner surface free from grooves or ridges and accurately dimensioned to a predetermined diameter; the outer diameter of the glow plug sleeve is formed to be just slightly larger and the sleeve is then press-fitted, after having been axially aligned with the bore by axially pressing it into the bore; preferably, the end portion of the bore through which the sleeve is inserted is slightly chamfered or funnel-shaped. The manufacturing step of dimensioning and finishing the bore is preferably carried out by ball calibration, that is, by pressing a hardened steel ball therethrough.

REFERENCES:
patent: 2996801 (1961-08-01), Klossika
patent: 3164748 (1965-01-01), Testerni
patent: 3749980 (1973-07-01), Baxter

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