Importance

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Abstract

A keypad for telephones includes a case composed of two parts. One part has slots for mounting and guiding keys. The keys are arranged such that each causes the closure of two contacts which are fitted onto a substrate mounted inside the case. The contacts are installed with the assistance of a number of modular supports, each of which consists of two independent elements that are fastened together and, when joined define a means for positioning the contacts pertaining to the adjacent modular support. Means provided on the keys to cause two simultaneous closures includes two identical protuberances which are integral with the keys and protrude from diametrically opposite points of the respective bases. The keys have a positioning mechanism to restore them to their idle position, including pushing elements with an elastic action which react against the substrate where the contacts are fitted. The two component parts of the case of the assembly are coupled together in a dust-proof manner, even at the fastening points.

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First Claim