Multiple push-button switch arrangement

摘要

A plurality of switch elements are disposed within a casing made of synthetic resin. Each of the switch elements is changeable between a normally-open state and a closed state. A plurality of movable stems are made of synthetic resin. At least parts of the stems extend in the casing and engage the respective switch element. The switch elements are changed between the open and closed states in accordance with movements of the stems respectively. The switch elements can be locked in the closed states. Any one of the switch elements can be unlocked and moved from the closed state when another switch element is changed from the open state to the closed state. At least two of the switch elements are prevented from being simultaneously locked in the closed positions. A mechanism allowing the locking process and unlocking process includes a plate made of synthetic resin and extending within the casing. A mechanism allowing the simultaneously lock preventing process includes a plate made of synthetic resin and extending within the casing. The plates extend in parallel.