An alarm system for detecting and recording the time of arrival home of a young person who has a definite curfew for his or her return. The system allows the parents of the young person to reture for the evening with the assurance that they will be awakened if their son or daughter does not return on time, but will not be disturbed if he or she arrives home on or before the appointed time.
A programmable timing device adapted to be programmed to produce a signal after expiration of one or a multiple of timing periods. Each actuation of a programming switch representing one such timing period. And a lockout circuit effective to limit the time within which the programming switch is effective to program the device.
In a display terminal coupled to a computer and including a plurality of user interrupt devices for interactive communication with the computer, an apparatus for signalling to the user when the computer responds to a user interrupt comprises a counter arranged to measure a specified period of time by counting down to zero from an initial count value loaded from a register, a sensor triggered by the generation of an interrupt to cause the counter to begin measurement of the said specified period of time, and a further sensr coupled to an alarm via a logic gate to provide an audible signal only when the period of time between the generation of the interrupt and the computer response exceeds the specified period of time measured by the counter.
A time delay and alarm system is provided to ensure safe operation of periodically activated apparatus having potentially dangerous moving parts. The system preferably employs a 555 type integrated timer circuit, a horn, and a pulse generator which causes the horn to produce a cyclical sound.
An alert system for alerting a supervisor when an employee has worked beyond a predetermined time limit. The alert system comprises a time collection device that is interfaced with at least one alarm device. The time collection device is selectably operable to detect the input time when the employee clocks in and to generate an alert message when the employee works beyond the predetermined time limit. The predetermined time limit is set to a predetermined amount of time before a potential labor control violation, such as a violation of child labor laws or a violation of wage and hour laws, is about to occur. The time collection device comprises an input device interfaced with a controller which has the predetermined time limit stored in memory. The time collection device also includes a timer that is interfaced with the controller. The timer records the time that the employee clocks in and monitors the elapsed time after the input time. The alert system is operative to detect when the elapsed time exceeds the predetermined time limit and to send an alert signal from the controller to a selected alarm device.
