Hair styling iron with timer

摘要

A hair styling iron includes a handle to which a barrel is mounted, a heating element in the barrel, a rotary drive including a motor that rotates the barrel, a control circuit including a timer, and a momentary drive switch which is user actuable and connected to the control circuit for control of the motor. Actuation of the drive switch must be maintained to operate the rotary drive. The control circuit monitors at least one change of state of the drive switch to determine a starting time, and actuates an alarm after an elapsed time measured from the starting time. The elapsed time is calculated by the control circuit in direct proportion to an angle of rotation of the barrel relative to the handle that occurs between a first actuation of the drive switch and release of the drive switch immediately following the first actuation of the drive switch.

主权项

1. A hair styling iron comprising:
a handle to which a barrel is mounted; a heating element in the barrel; a rotary drive including motorised means that rotates the barrel relative to the handle; a momentary drive switch actuable by a user of the hair styling iron, wherein actuation of the momentary drive switch must be maintained by the user to operate the rotary drive; and a control circuit connected to the momentary drive switch for control of the motorized means and including a timer, wherein the control circuit monitors a switch-operating time defined as a continuous time period between actuation and release of the momentary drive switch and calculates an elapsed time which is in direct proportion to an angle of rotation of the barrel relative to the handle that occurs during the switch-operating time, and the release defines a starting time of the timer, wherein the control circuit includes an alarm which provides an alarm signal upon expiration of the elapsed time, measured by the timer from the starting time.