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Capped electric lamp and low-pressure mercury-vapor discharge lamp
| Details |
Inventors: Van Duivendijk, Pieter Dirk Melis; De Bot, Frank Gerardus Cornelis; Spaapen, Antonius Johannes;
Assignee: Koninklijke Philips Electronics N.V. (Eindhoven, NL)
Primary Examiner: Vu; David
Assistant Examiner: Lee; Wilson
Attorney, Agent or Firm: Keegan; Frank
An electric lamp has a cap, which is secured to a light-transmitting lamp vessel having an electric element. The lamp cap has a projecting contact pin. An electric conductor is connected to the electric element and the contact pin. The contact pin is unilaterally deformed in an inward direction so as to form an indentation for fixing the electric conductor. The electric conductor in the contact pin does not extend substantially beyond a boundary of the indentation. The indentation has a pinch portion. The pinch portion deepens at an angle a with respect to the axis, where 25.degree..ltoreq..alpha..ltoreq.45.degree.. In addition, the indentation has a press portion for fixing the electric conductor in the contact pin. |
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DETAILED DESCRIPTION It is an object of the invention to provide a capped electric lamp of the type mentioned in the opening paragraph, wherein said drawback is obviated.
In accordance with the invention, this object is achieved in that the electric conductor in the contact pin does not extend beyond a boundary of the indentation that is furthest removed from the lamp cap.
The indentation in the contact pin is formed in the course of the manufacture of the electric lamp by an inward deformation of the contact pin.
By locally indenting the contact pin, the electric conductor is fixed in the contact pin.
As a result of said indentation, the electric conductor is weakened near the boundary of the indentation to such extent that, upon exerting a pulling force on the end portion of the electric conductor projecting from the contact pin, the electric conductor breaks off at a predetermined location.
By providing the electric conductor with a predetermined weakened portion, the electric conductor breaks off near the boundary of the indentation.
After breaking off the electric conductor, (the end portion of) the electric conductor no longer projects from the contact pin.
As a result, cutting and/or filing of the end portion of the electric conductor projecting from the contact pin after fixing the electric conductor has become superfluous.
It is to be noted that the exertion of a pulling force on (the end portion of) the electric conductor can alternatively be carried out, after fixing the electric conductor in the contact pin, by suitably twisting the end portion of the electric conductor projecting from the contact pin.
Experiments have further shown that upon pulling loose the end portion of the electric conductor, the fixation resulting from the indentation of the contact pin is sufficiently strong, so that the end portion of the electric conductor can be pulled loose independent of the fixation of the electric conductor.
Indenting the contact pin to weaken the electric conductor preferably takes place unilaterally
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