Keyboard

A keyboard comprising a support having in its upper surface a plurality of recesses therein arranged as a matrix and having apertures therein which extend through said support, a plurality of keys having upper portions adapted to fit in said recesses and rod portions which extend through said apertures, contact elements arranged as a matrix in the lower portion of said support comprising a first set of parallelly arranged conducting strips and a second set of parallelly arranged conducting strips generally perpendicular to said first set, a conducting strip of said first set and a conducting strip of said second set crossing each other below and laterally to one side of said rod portion of each said key, said conducting strip of said second set having a flexible arcuate portion which engages the lower end of the rod of a key and normally biases said key to its upper position and a second arcuate portion contiguous with said flexible arcuate portion, the juncture between the arcuate portions having a first position which is spaced apart from a conducting strip and a second position which is in contact with the last mentioned conducting strip, said flexible arcuate portion moving downwardly when said key is depressed thereby causing said juncture to move downwardly from one of its aforementioned positions to the other, and means for maintaining said keys in their recesses.