DE2304510A1 - SMALL GLASS LAMP WITH LATERAL CONTACT LAMPS - Google Patents

Description

Company ¥. Albrecht KG .. 8600 Bamberg. Kirschäckerstraße 9

"Small incandescent lamp with lateral contact lamellas"

The invention relates to a miniature incandescent lamp with lateral, electrically contacting with the power supply wires of the lamp connected contact lamellas and a plastic base.

Such miniature incandescent lamps are already known, for example the so-called "telephone lamp", in which two contact blades are glued to the side of the cylindrical glass body which are usually held together below the lamp by a plastic part, with those in the lamp glass body Fused power supply wires are soldered to the contact lamellae.

This lamp has the disadvantage that as a result of the plastic base provided below the lamp for combining the contact blades the total length of the capped miniature incandescent lamp is greater than that of a capless lamp glass body.

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23Q451Q - ζ -

In particular when using miniature incandescent lamps as miniature indicator lamps, however, it is often required that the The total length of the capped miniature incandescent lamp must not exceed that of a capless lamp glass body, as for these applications often a certain, very small, installation depth must not be exceeded, the diameter is not critical.

The invention is based on the object of providing a miniature incandescent lamp with lateral contact blades and a plastic base create, the length of which is not greater than that of the lamp body without a base.

To solve this problem, it is provided in a miniature incandescent lamp of the type mentioned according to the invention that the Base a the lower part of the lamp body receiving Plastic sleeve with mutually opposite longitudinal grooves with window recesses for the insertion of essentially straight ones Contact lamellas each have a U-shaped outwardly bent central section, the ends of which are clamped to the bent back The connecting wires of the lamp are in contact and protrude with their bent middle section into the window recesses.

The lower end of the lamp body can thus lie exactly in one plane with the lower edge of the plastic sleeve, so that the capped miniature incandescent lamp has exactly the same length as the actual lamp body. As a result of the special

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formation of the contact lamellas, the soldering of the connecting wires to the contact lamellae can be dispensed with, since a sufficient electrical Contact is given solely due to the clamping contact of the ends of the lamellas. Those in the window recesses in the area of the longitudinal grooves protruding middle sections of the contact lamellae are when inserting a miniature incandescent lamp according to the invention into a corresponding lamp socket at their counter contacts.

Advantageously, the cylindrical wall of the plastic sleeve can be pressed outward in the form of a web to form the longitudinal grooves, so that the outwardly protruding webs act as guide ribs when inserting such a miniature incandescent lamp into a lamp socket can serve.

In a further development of the invention, the plastic sleeve can prevent the lamp body from being pushed through the sleeve Have stops that can be arranged, for example, that they then into the lower arch of the lamp body intervene laterally, 'when the melted connector is in a plane with the lower end face of the plastic sleeve.

It can be much more simply and independently of the respective shape and length of the fused connection piece of the lamp body the stop limiting the insertion of the lamp body, according to the invention, also as a thin-walled base of the plastic sleeve form. It is true that the length of the miniature incandescent lamp

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with base increased by the thickness of the base compared to the length of the lamp body, but this slight increase occurs no role, especially since the thickness of the bottom can be chosen to be extremely small, since it is only used as a limit stop serves and does not need to take on any supporting function.

The longitudinal grooves of the plastic sleeve, which are essentially Extend over the length of the cylindrical central part of the lamp body, since in this area the pressing of the bent back Connecting wires to the lamp body can advantageously open out at the upper end edge of the plastic sleeve, so that the shape of the longitudinal grooves on the inside Web can be done in a simple manner in the injection molding of the plastic sleeve according to the invention.

In a further development of the invention it can be provided that the two ends of each contact blade, which is advantageously one for Have guidance of the bent back connecting wires serving longitudinal corrugation and transversely to the longitudinal direction according to the Circumferential curvature of the lamp body can be bent, enclose an obtuse angle close to 180 °, so that they Apply resiliently to the connecting wires and thereby also compensate for tolerances between the inner diameter of the plastic sleeve and the always slightly fluctuating outside diameter of the lamp body is given.

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Finally, it is within the scope of the invention that the middle sections of the contact blades protruding into the window recesses protrude with a curvature over the outer wall of the plastic sleeve so that they .können spring in the radial direction, and so that resilient contacts in the socket can be dispensed with.

Further advantages, features and details of the invention emerge from the following description of some exemplary embodiments as well as based on the drawing. Show:

/ ··,
Fig. 1 is a perspective exploded view of the individual

parts of a miniature incandescent lamp according to the invention;

FIG. 2 shows a longitudinal section through the assembled lamp according to FIG. 1;

3 shows a section through the lamp transversely to the longitudinal direction and

4 shows a longitudinal section through a lamp with differently shaped contact blades.

The base according to the invention for a miniature incandescent lamp consists of a substantially cylindrical sleeve 1 with one another opposite longitudinal grooves 2, which protrude as webs 3 over the cylinder circumference of the sleeve 1. These webs 3 serve as Guide ribs when inserted into a socket. In the grooves 2 window openings 4 are provided, in which U-shaped outwardly bent middle sections 5 of essentially straight ones

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Contact lamellas 6, which are inserted into the grooves 2
will.

When the lamp body 7 is then inserted with the connecting wires 8 bent back, the connecting wires 8 are of the
ends 10 of the contact lamellas provided with a longitudinal riffing 9 are pressed against the outer wall of the lamp body in a clamping manner,
which, in addition to making contact, also provides a clamp bracket for the
Lamp body 7 is achieved. The lamp body 7 can also be glued into the plastic sleeve.

The in the illustrated embodiments corresponding to the tapering of the lamp body frustoconically downwards
tapering plastic sleeves have a thin base 11, which acts as a limit stop when the lamp body 7 is inserted
serves.

The protruding into the lensterausnehmungen 4 of the plastic sleeve middle sections 5, the length of which is as close as possible to the height of the
Window recesses 4 corresponds to, are after insertion
a miniature incandescent lamp according to the invention in a socket on associated opposite side contacts of the
Version on.

According to the arrangement according to FIG. 4, the central sections 5 provided with a curved section 12, so

the contact lamellas themselves form resilient in the radial direction

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Contacts and thus resilient contacts in the socket surrounding the lamp can be dispensed with.

The invention is not limited to the illustrated embodiments. So could be in addition to another training of the Insertion limit stop of the plastic sleeve 1 - instead of the illustrated bottom 11 - also be provided that the Lamp body 7 does not bear directly on the inner wall of the plastic sleeve 1 but on tolerance compensation ribs.

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Claims (10)

Patent claims: (1. Small incandescent lamp with lateral, with the power supply wires the lamp with electrically connected contact lamellae and a plastic base, characterized in that, that the base has a plastic sleeve (1) receiving the lower part of the lamp body with opposite one another Longitudinal grooves (2) with window recesses (4), for inserting essentially straight contact blades (6) each with a U-shaped outwardly bent central section (5) which is clamped with its ends (10) to the The bent-back connecting wires (8) of the lamp are in contact with their bent-out central section (5) in the window recesses (4) protrude. 2. Small incandescent lamp according to claim 1, characterized in that the cylindrical wall of the to form the longitudinal grooves (2) Plastic sleeve (1) is pressed outward in the shape of a web. 3. Small incandescent lamp according to claim 1 or 2, characterized in that that the plastic sleeve (1) has a thin-walled base serving as a stop when the lamp body (7) is inserted (11). 4. Small incandescent lamp according to one of claims 1 to 3> characterized in that the longitudinal grooves (2) of the plastic sleeve (1) extends essentially the length of the cylindrical A09832 / 0A86 23CM510 Extend middle part of the lamp body (7). 5. Small incandescent lamp according to one of claims 1 to 4, characterized in that the longitudinal grooves (2) on the upper end edge the plastic sleeve (1) open out. 6. Small incandescent lamp according to one of claims 1 to 5, characterized in that the ends (10) of each contact blade (6) enclose an obtuse angle close to 180 ° with one another. 7. Small incandescent lamp according to one of claims 1 to 6, characterized in that the ends (10) of each contact blade (6) have a longitudinal rib (9) serving to guide the bent-back connecting wires (8). 8. Small incandescent lamp according to one of claims 1 to 7, characterized in that the ends (10) transversely to the longitudinal direction the contact blades (6) are bent according to the circumferential curvature of the lamp body (7). 9. Small incandescent lamp according to one of claims 1 to 8, characterized in that the protruding into the window recesses (4) Central sections (5) of the contact lamellas (6) protrude with a curvature over the outer wall of the plastic sleeve (1). 4 09832/0486 230-510 - ίο - 10. Small incandescent lamp according to one of claims 1 to 9, characterized characterized in that the lamp body (7) is glued into the plastic sleeve (1). 409832/0486 Blank page