Browse Prior Art Database

Fold Switch

IP.com Disclosure Number: IPCOM000087755D
Original Publication Date: 1977-Mar-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 48K

Publishing Venue

IBM

Related People

Harris, RH: AUTHOR

Abstract

Fig. 1 shows the structure of a simple switch that can be mounted between two machine members that move relative to one another so that the switch will close when the members come together. The moving crosshead on a lathe, a moving push button on a keyboard and a variety of other devices illustrate mechanisms in which one portion moves relative to another and may come into contact with a switch of this type.

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Fold Switch

Fig. 1 shows the structure of a simple switch that can be mounted between two machine members that move relative to one another so that the switch will close when the members come together. The moving crosshead on a lathe, a moving push button on a keyboard and a variety of other devices illustrate mechanisms in which one portion moves relative to another and may come into contact with a switch of this type.

Fig. 1 shows a single sheet of copper clad flexible plastic insulator that has an etched circuit pattern 2 having contact areas 3 formed therewith, all being tightly bonded to the flexible plastic substrate. The pattern of the circuit 2 is such that, when it is folded back upon itself about an axis 4, the two contact areas 3 overlie one another in a vertical plane. The natural resiliency of the fold 4 and metal strips 2 serves to hold the fold apart in the area of contacts 3 in order to produce an open circuit between the contacts 3 when no force is applied. A laminated covering 5 holds the folded section partly closed and protects the contacts 3 from accidental shorting by other methods.

Fig. 2 shows the artwork of a circuit pattern 2 with contacts 3 on a substrate 1 together with the position of the desired fold line 4. The switch is manufactured by etching the desired circuit layout on a copper clad flexible substrate 1 or on other suitable flexible circuitry. The parts are then folded sharply on the fold line 4, and covered with the laminated...