Electric heating – Heating devices – Combined with pressure application means
Patent
1993-07-12
1995-01-10
Paschall, Mark H.
Electric heating
Heating devices
Combined with pressure application means
219251, 219501, 219481, 219507, 340562, 340573, H03K 17955, H03K 1796, H05B 102
Patent
active
053809831
ABSTRACT:
An electrical appliance, such as a pressing iron (10), includes a user proximity sensor for removing electrical power from the appliance after a period of non-use. When a user's hand is in close proximity to, or is in a grasping relationship with, a handle (28) of the pressing iron, an antenna (44) that is disposed within the handle is capacitively coupled to the user through a dielectric material that forms the handle wall. When so coupled to the user, a displacement current having a frequency equal to the AC line electrical power frequency signal (50 Hz or 60 Hz) is capacitively coupled between the user's body and the antenna. The displacement current is detected and amplified by circuitry (60) that is connected to the antenna by a conductor (46). This circuitry outputs a signal that indicates the proximity of the user to the handle of the pressing iron. The output signal is in turn employed to disable the operation of a time-out circuit (70). When the user is not in proximity to the handle of the pressing iron, the output signal is not generated and, after a predetermined time-out period, electrical power is automatically removed from a heating element (86) of the pressing iron.
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Carley Joseph
Cavada Luis O.
Hohlfeld Peter R.
Horey Leonard I.
Black & Decker Inc.
Deutsch Barry E.
Paschall Mark H.
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