Abstract: A trigger switch for use in coin operated devices and particularly in telephone paystations consisting of a plurality of parallel channels each including one or more openings through which a light beam passes. Deposit of coins in the appropriate channels blocks one or more light beams passing through the openings causing detection of the light blockage by associated light detectors to operate to give an indication of the quantity and value of coins deposited through the coin channels. A common trigger mechanism is also included and operates in response to deposit of any coins through the trigger switch, to provide operation of an associated coin relay.

Abstract: A special door is added to the coin receiving mechanism of a pay telephone or other vending machine to discourage the practice of stuffing the mechanism with paper or other foreign matter to trap deposited coins. A slot in the door is normally aligned with the regular slot for coin deposit. If stuffing occurs, the door slides over, misaligning the two slots and preventing deposit of any further coins.