Keyboard assembly with overlapped flexible printed circuit cable switch

A keyboard assembly comprising:

• a. a flat flexible cable with a portion thereof folded back over on itself and having contacts deposited on both facing surfaces, contacts on one surface being directly across from contacts on the other surface;
• b. means for connecting the contacts into electrical circuits;
• c. a layer of insulating material positioned between the two contact-carrying surfaces and having holes therethrough, said holes being in registration with opposing contacts;
• d. a spring plate, overlying the folded over cable and containing a plurality of resilient first spring members, said members being formed from and integral with the plate, each member comprising a horizontal arm with a vertical arm extending obliquely upwardly and with a pair of spaced, semispherical heads on either side projecting downwardly and positioned adjacent an outside surface of the folded over portion of the cable with each head being in direct alignment with a contact located on the inside surface;
• and
• e. means for depressing the first spring members such that the horizontal arm rotates about its point of attachment with the plate and the semi-spherical heads push on the cable forcing the aligned contacts through the holes in the insulating material and into electrical engagement with the contacts on the facing surface.