JPH0451955B2 - - Google Patents

Abstract

A plurality of daughter printed circuit boards (12) are detachably mounted on a backplane (14) and electrically connected to a bus bar (16, 17) on the same side of the backplane via contacts (18) on the daughter boards that mate with contact portions (20) of the bus bar. A plurality of parallel contacts (28) provide increased current carrying capacity. <IMAGE>

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to an apparatus for releasably attaching a plurality of daughter printed wiring boards (PCBs) to a support plate.

BACKGROUND OF THE INVENTION A support plate is a printed circuit board or a metal plate with a vertical line on its upper side for easy removal and replacement while the circuit is still receiving current. A “child” PCB is detachably attached. Connect a child wiring board to another child wiring board,
One method of electrically connecting to the support plate and to another circuit section is to provide a metallized surface near the edge of the daughter board and attach it to the fork-shaped electrical connector that is secured to the support plate. It is inserted between the teeth.
Another method of making electrical connections to daughter boards is with post and box connectors. Connectors fixed to support plates often include connector posts extending from the underside of the support plate for receiving wires connecting selected pairs of posts, and for distributing voltage to multiple posts. Bus bars are often connected to a row of connector posts below the support plate. These connections to daughter boards are generally designed to carry small currents, so if large currents are required, a large number of contacts are connected in parallel.

SUMMARY OF THE INVENTION By attaching the bus bar to the same side of the support plate as the slave wiring board and providing the slave wiring board with contacts that directly engage with the contact portions of the bus bar, space can be saved and the slave wiring can be separated. A better electrical connection can be provided between the components on the board and the bus bar, thus reducing current resistance and increasing reliability. In the configuration adopted, the busbar contact portion includes a male portion extending along the length of the busbar and across the support plate, and the daughter board contact is adapted to engage this male portion. It has fork-shaped teeth that can
The daughter board also has two or more fork-like contacts for engaging one bus bar to increase current carrying capacity. In one configuration, the bus bar is connected to the support plate through an insulator housing, and in another configuration, the bus bar has a connector post extending through a hole in the support plate.

Description of Adopted Configuration Example The structure and operation of the adopted configuration example of the present invention will be explained next.

1 and 2, there is shown a daughter wiring board mounting device 10 including a daughter wiring board 12 mounted on a support plate 14, and this daughter wiring board is attached to a bus bar 1.
Female contact 18 engaging male contact portion 20 of 6, 17
It is electrically connected to bus bars 16 and 17 via. Although not completely shown in FIGS. 1 and 2, each child wiring board 12 has a plurality of female contacts 18, which are connected to bus bars 16, 17 and other bus bars not shown. It is designed to make electrical connections. In parts of the daughter board 12 that are not shown, there are further contacts for making electrical connections between components of other daughter boards, for example via connector posts with wires wrapped around them. .

Busbars 16, 17 are made of copper and, in the present configuration, have a base 22 approximately 3.56 mm (0.140") high and approximately 3.81 mm wide below the vertically extending male portion 20.
(0.150"), and the male portion 20 is approximately 0.635 mm (0.025") thick in this configuration. Bus bar 16,
17 is connected to the support plate 14 by the insulator housing 24.
attached to and electrically isolated from. Capacitor 30 is connected directly between bus bars 16,17. The bus bar 17 is connected to the lead 3 by a screw 34 that can be screwed into a screw hole 36.
A connector 38 is attached to the bus bar 16 for receiving a lead 37, which is held in place by a set screw 39. The bus bar used for grounding is mounted higher than other voltage distribution bus bars, so that when connected, the daughter board 12 must first ensure electrical contact with the ground bus bar. conduct.

The female contacts 18 are well known tuning fork contacts that meet military specifications MIL-C-28754 and are capable of drawing 5(+) amps each. The female contacts are soldered to the metallization of the daughter circuit board 12 and embedded in an insulator 26 which is positioned above the housing 24 when the fork-like teeth 28 are slid onto the male part 20. It is shaped to fit snugly within the extension. The portions of the female contacts 18 attached to the slave wiring board 12 are arranged in vertical alignment and are electrically connected in parallel, so that the space is not used up along the width of the slave wiring board 12. Current capacity increases.

Operation In operation, the daughter board 12 can be easily mounted and electrically connected to the support plate 14 by lowering it into engagement with the bus bars and other connectors on the support plate. Since the ground bus bar is higher than the other bus bars, the daughter board first makes contact with the ground to prevent component damage.
The bus bar is on the same side of the support plate as the daughter board and is directly connected to the daughter board, which saves space and provides good electrical connection between the components on the daughter board and the bus bar. Continuity exists. Since the bus bar is placed on the same side as the child wiring board, there is a space between the bus bars where the capacitor can be easily installed, and there is also a problem of contact between the wires wound around the connector pillar and the bus bar. can be avoided.

Other Configuration Examples Other configuration examples of the present invention are within the scope of the claims. For example, as shown in FIG. 3, a bus bar 40 with a connector post 42 for making an electrical connection with the conductive portion of a support plate 44 can be used. Besides copper, other hard conductive materials can also be used for the bus bar, such as phosphor bronze and brass.

[Brief explanation of the drawing]

FIG. 1 is a partially cut away elevational view of an apparatus for releasably mounting a plurality of child printed wiring boards on a support plate. FIG. 2 is a partially removed perspective view of the device of FIG. 1, showing the daughter wiring board separated from the support plate. FIG. 3 is a partially cut-away perspective view showing an alternative busbar construction for use in the above-described apparatus. In these drawings, 10 is a slave wiring board mounting device, 12 is a slave wiring board, 14 is a support plate, 16, 1
7 is a bus bar, 18 is a female contact, 20 is a contact part, 2
2 is a base, 24 is an insulator housing, 30 is a capacitor, 26 is an insulator, 28 is a fork-shaped tooth,
40 is a bus bar, 42 is a connector column, and 44 is a support plate.

Claims (1)

[Claims] 1. A device for separably mounting a plurality of sub-printed circuit boards on a support plate, the device comprising: electrical connection between components on different sub-print circuit boards mounted on the support plate; a support plate containing conductors for making connections; and at least one busbar mounted on one side of said support plate, extending along one axis and for providing voltage or ground to a plurality of child printed circuit boards. a bus bar made of a conductive material in sufficient quantity to distribute a plurality of child printed circuit boards to the support plate and having a plurality of contact portions along the axis, the contact portion comprising a brake; a plurality of child printed circuit boards having a bottom end along one surface of the support plate and mounted on the support plate, each of the child printed circuit boards having a bottom end along one surface of the support plate; placed in different planes perpendicular to the support plate and across the axis of the bus bar, each of the child printed circuit boards holding a plurality of electrical components, each of the child printed circuit boards being in contact with the contact portion; a female contact having at least one daughter contact configured to engage, said daughter contact having fork-like teeth spaced apart to engage a blade therebetween; each of the plurality of child printed circuit boards has an insulating member surrounding the child contact and has an aperture in the bottom for electrically engaging the blade with the fork-shaped teeth; and other contacts electrically connected to the conductors of the support plate, thereby providing electrical connections between components on different circuit boards of the plurality of child printed circuit boards; Apparatus in which good direct electrical contact is maintained between a circuit board, the bus bar, and the support plate. 2. said contact portion comprises a male portion extending across said support plate along the length of said generatrix bar, said child contacts having fork-like teeth engaging opposite sides of said male portion; 2. The device of claim 1, which is a female contact. 3. A plurality of female contacts are provided on the child printed circuit board, connectable to a common bus bar, the female contacts being arranged in a row along an axis transverse to both the bus bar and the support plate. 3. The device of claim 2, which is attached to a daughter circuit board. 4. The apparatus of claim 2, wherein the bus bar is attached to the support plate by an insulator housing. 5. The device of claim 4, wherein the bus bar has a wider portion below the male portion than the male portion. 6. The apparatus of claim 2, wherein the bus bar includes a connector post passing through the support plate. 7. The device according to claim 2, wherein two bus bars are provided, one bus bar being higher than the other bus bar. 8. The device of claim 1, wherein the bus bar is made of copper, phosphor bronze, or brass. 9. The device of claim 2, wherein the male portion is approximately 0.022 inches thick. 10. The apparatus of claim 2, 3, or 9, wherein each of the child contacts has a current capacity sufficient to carry a current of at least 5 amps. 11. The apparatus of claim 1, wherein said bus bar is made from a single piece of metal.