Mannesmann Kienzle Gmbh

Oskar Zumkeller

Werner Schneider

Hans Grieser

Hugo Fesenmeieir

Hugo Fesenmeier

A push button for a keyboard wherein a detent, provided at the keyboard base on the side opposite to that of a guidance sleeve, is designed centrally to the passage aperture of the guidance sleeve, a lug is molded on the side of the keyboard base carrying the detent, the shaft on the push-button head is slotted and a nose or dog is radially molded on at least one of the resulting resilient shaft, this nose or dog coacting with a stop face formed on the keyboard base, a finger is formed on the push-button head parallel to the shaft and a guidance aperture for engaging the finger is formed in the lug molded on the keyboard base.

Push button for a value input keyboard

A push button for an inductive value input keyboard having a push-button socket, a push-button head guided in the push-button socket, a compression spring which acts between the push-button socket and the push-button head, a stop which limits the stroke of the push button in the non-actuated state, and a rod-shaped iron core fastened to the push-button head for interaction with an induction coil formed by conductor paths upon a printed circuit board on which the push button is arranged. A sleeve is molded at the push-button head and has a non-cylindrical aperture therethrough and is elastically deformable transverse to its axis within which the iron core is clamped.

Growing community of inventors

Villingen-Schwenningen, Germany

Oskar Zumkeller