Lock having maid lockout and deadbolt protector

Abstract From the Canadian patent

This look, which may be coded-keycard operated has a set-, table device on the inside of the door by which the maid for, instance, can be locked out. The lookout setting device is preferably in the form of a pushbutton or deadbolt turnpiece which manipulates a switch in the code-receiving circuitry. The lockout setting is automatically cancelled when the latch is retracted. When the setting device comprises a deadbolt turnpiece the deadbolt is biased toward retracted position and the setting device holds the deadbolt extended. When the latch is retracted in the latter version, the retraction cancels the lockout setting and permits the deadbolt to retract under the power or the deadbolt …