FR2743687A1 - ELECTRICAL COMPONENT HAVING FEET-CONNECTING WIRES - Google Patents

Abstract

To mount stably in a horizontal position on a printed circuit board, an electrical component comprising connecting wires (24, 25), such as a gas-filled surge arrester, the free ends (26, 27, 29) of the wires ( 24, 25, 28) of connection are bent so as to form feet. For a three-electrode surge protector, the two front connecting wires (24, 25) and the lateral connecting wire (28) are bent in planes parallel to each other so that the flattened feet form the vertices of a triangle (D).

Description

ELECTRICAL COMPONENT HAVING CONNECTION WIRES

FEET SHAPE

  The invention relates to the field of assembly of printed circuits comprising electrical components and can be used for the embodiment necessary for this purpose of components which have a cylindrical shape and which are provided with at least two wires. connection; corresponding components can be for example resistors,

  gas-filled capacitors and surge protectors.

  When equipping printed circuit boards, it has recently been dispensed with putting the connection wires of the electrical components to be soldered to the conductive tracks of a printed circuit board in holes in the conductive tracks, but the components fitted are fitted appropriate fittings on the blank conductor tracks. In order to be able to mount stably by as simple means as possible also cylindrical components comprising two connection wires axially projecting from a printed circuit board, it is already known to bend the connection wires 180 in the direction of the component in a common plane in such a way that, when the component is used in a layer circuit, the weight vector of the component passes through the center of the

  plane defined by the ends of the connecting wires (DE 25 08 702 A).

  For relatively long cylindrical components, the sections of the connecting wires which each form a foot also have a length

relatively large.

  There are specially embodiments for gas surge arresters in which there is provided, in addition to the two electrodes mounted on the front sides, another electrode mounted in the center and which consequently comprise two connection wires mounted on the front sides and a

  connecting wire mounted on the side surface.

  From a cylindrical electrical component comprising two metallic connecting wires mounted on the front sides and a metallic connecting wire mounted on the lateral surface, each of the wires consisting of a metallic wire of circular cross section, the invention aims to allow simply a stable mounting of such a component. This is achieved, according to the invention, by the fact that the metallic connection wires are bent parallel to the front faces of the component so that their free ends form feet whose arrangement in space is chosen, so that the component is placed stably horizontally, so that they form the vertices of a triangle, the free ends being flattened and having a bearing surface

from about 1 to 10 mm2.

  By giving this kind of shape to the connection wires, the cylindrical component can be mounted horizontally in a stable manner, the flattening of the free ends of the connection wires usually of circular cross section, which can be obtained for example by subjecting them to crushing. , used to enlarge the contact surface and to improve the mechanical resistance of the desired solder junction between the wires

  connection and printed circuit board.

  An exemplary embodiment of the new component is shown in Figures 1 to 3. In the drawing: Figures 1 and 2 are two views of a three-electrode surge suppressor having ceramic insulators, and Figure 3 shows part of a wire of connection, per se of

  circular cross section, flattened in the foot area.

  Figures 1 and 2 show a three-electrode surge suppressor which consists of a central electrode 23, two ceramic insulators 33 and 34 and two end electrodes 21 and 22, as well as connecting wires 24, and 28. The two connecting wires 24 and 25 are welded axially to the end electrodes 21 and 22, while the connecting wire 28 is welded tangentially to the outer periphery of the central electrode 23. The connecting wires 24 and 25 are bent so that the free ends each extend in a plane parallel to the front faces of the cylindrical surge arrester. They thus form two legs which are provided at their free ends with a foot 26, respectively 27. A third leg is formed by the connecting wire 28 which is bent radially outward and which is also provided at its free end with 'a foot 29. The bending of the connecting wires and the arrangement of the feet are chosen so that the three feet 26, 27 and 29 according to Figure 2 form the vertices of a triangle D, in the present case of a isosceles triangle; when the surge protector thus produced is mounted on a plate, the center of gravity of the surge protector is inside the triangle D,

  which provides great stability.

  According to FIG. 3, each connecting wire is provided at its free end 31 with a flattening 32, in order to ensure a sufficiently large soldering surface when it is placed on a conductive track of the wafer 30. This flattening 32 and the length of the feet 26, 27 and 29 are to be chosen so that the support surface is at least 1 mm2,

preferably around 4 mm2.

Claims (1)

CLAIM   1. Cylindrical electric component (20) comprising two connection wires mounted on the front sides and a connection wire mounted on the lateral surface, each of the wires consisting of a wire of circular cross section, characterized in that the wires (24, 25, 28) of connection are bent parallel to the front faces of the component so that their free ends form o feet (26, 27, 28) whose arrangement in space is chosen, so that the component (20) is stably positioned horizontally so that they form the vertices of a triangle (D), the free ends (31) being flattened   (32) and having a bearing surface of approximately 1 to 10 mm2.