Abstract:
A composite support for fabricating a prototype electrical circuit has a rectangular planar board with a plurality of rows and columns of double sided annular toroidal connection eyelets. The planar board is mounted on a rectangular support tray having a well. The connection eyelets of the planar board have a diameter of from 1.30 mm to 1.80 mm. A high temperature sheet material adhered to the entire undersurface of the planar board, which is pierced by leads of electrical components inserted into the connection eyelets. A spongy retainer block or a breadboard may also be located in the support tray well.
Abstract:
A circuit board threadplate for connection of a component to a circuit board is provided wherein such threadplate may be mechanically mounted to a circuit board without the use of manual labor. Specifically, the threadplate is compatible with present Surface Mount Technology robotic placement machines. Such circuit board threadplate comprises a hollow substantially cylindrical member forming an extruded neck having an elongated section and a substantially flat surface at a first end of the elongated section and a flange extending from a second end of the elongated section. The flange provides a substantially flat surface suitable for soldering onto a surface of a circuit board. Additionally, the threadplate comprises a cylindrical cavity positioned inside the substantially cylindrical member, extending in a direction aligned with the substantially cylindrical member. The cylindrical cavity may have a thread pattern suitable for receiving a screw-type fastener. Finally, the threadplate comprises an opening providing access to the cylindrical cavity.
Abstract:
A method of, and device (10) for, connecting a plurality of flexible printed circuits (12) each comprising a layer (14) of electrically insulating material and a layer (16) of electrically conducting material. The method including the steps of forming a hole (18) through each flexible printed circuit; positioning first and second substantially rigid plates (20,22) of electrically insulating material on either side of the flexible printed circuits with the holes in the flexible printed circuits aligned with a corresponding hole (26,28) in each plate; extending a rivet (24) of electrically conducting material through the aligned holes to electrically connect with the layers of electrically conducting material on the flexible printed circuits; and enlarging the ends (30,32) of the rivet to secure the flexible printed circuits between the plates. Provides an improved electrical and mechanical connection between FPCs.
Abstract:
A machine for setting eyelets and the like in printed circuit boards includes a generally U-shaped frame having a pair of spaced-apart support arms defining a workpiece receiving zone therebetween, a first tool movably mounted in one of the support arms, and a second tool fixedly mounted in the other support arm and axially aligned with the first tool. An adjustable torque screw is connected to the first tool for moving the first tool into aligned contact with the second tool at a pre-determined eyelet setting pressure. The adjustable torque screw insures that the eyelet setting pressure does not exceed the pre-determined eyelet setting pressure despite continued rotation of the adjustable torque screw.
Abstract:
In a printed circuit board wherein chip components are mounted in aligned holes provided through two printed substrates stacked over one another, spacer members are interposed between the printed substrates so as to define spaces therebetween around the holes. Since the printed substrates and chip components are movable relative one another due to such spaces, thermal stresses in the joints between the chip components and the printed substrates can be relieved.
Abstract:
A multi-wire electrical interconnecting circuit member having a multi-wire matrix of insulated wires mechanically terminated on the multi-wire electrical interconnecting member. Wire retaining members positioned on the multi-wire electrical interconnecting member terminate the wires and establish a gas-tight electrical connection therewith. Each of the wire retaining members includes means for engaging a wire with sufficient force to penetrate any insulation thereon and establish and maintain a gas-tight electrical connection with the conductive core of the wire.
Abstract:
A circuit board eyelet is provided for flexibly interconnecting conductive patterns on opposite surfaces of a circuit board. The eyelet comprises a flanged end, an annular body and a plurality of staking legs. The annular body is double walled and has an annular solder flow channel between the walls. The solder flow channel communicates between the staking legs and the flanged end. A solder resist layer or an elastomeric plug in the interior of the body prevents the eyelet from filling with solder, and an annulet in the walls of the annular body provides for flexing of the eyelet connecting conductive patterns through a hole in the circuit board.
Abstract:
A method of making a multilayered circuit assembly from a plurality of flat, flexible circuit elements, wherein each circuit element includes a substrate having conductive means to define an electrical path of travel which is formed between a base layer made of insulation material and a cover layer made of insulation material. Each circuit element has a connecting station associated with the conductive means. The method generally includes the steps of forming the conductive means on the base layer of each circuit element, punching a first opening through the conductive means and base layer at a connecting station of each circuit element, soldering the connecting station of each circuit element so that a solid solder pad fills the first opening whereby the solder electrically contacts the conductive means, punching a second opening through the cover layer of each circuit element, securing the cover layer of each circuit element over the base layer and conductive means so that the first opening is generally concentric with the second opening, punching a third opening in each circuit element through the solder pad, stacking a plurality of punched and soldered circuit elements on top of one another so that the third openings are generally concentric, inserting a terminal into the third openings of the stacked circuit elements so that a portion thereof contacts the solder, and staking the terminal so that the other surface thereof forms a cold weld interference fit against the solder.
Abstract:
Loose piece eyelets are wiped back and forth across the top of a tilted transfer plate having eyelet receiving holes therein. An air flow is maintained through the holes in the transfer plate to seat the eyelets in the holes. A circuit board is positioned in a press on top of an anvil plate and the loaded transfer plate is mounted on top of the circuit board. Closing of the press moves a punch plate toward the transfer plate to force the eyelets from the transfer plate into holes in the circuit board and bring the lead ends of the eyelets into engagement with anvils on the anvil plate to stake the eyelets to the circuit board. Eyelets can be staked to the circuit board in holes off center with respect to the staking tooling.
Abstract:
Component mounting system for metallic printed circuit boards having insulating coatings on their surfaces is disclosed in which the drilled hole in the metallic board is lined with a thin walled liner of plastic tubing. A metallic receptacle is positioned in the liner so that the liner electrically insulates the receptacle from the metallic portion of the printed circuit board. The lead wire from the component is inserted into the receptacle and the board is solder-dipped to electrically connect the lead wire to a connecting path on the board. The heat from the soldering operation causes the liner to radially expand so that it achieves a tight fit in the hole. The board acts as a heat sink for the components mounted thereon but the board is electrically isolated from the components excepting where it is used as a grounding plane.