Handle and supporting structure for an electric pressing iron having electronic temperature control

• US 4,347,428 A
• Filed: 08/15/1980
• Issued: 08/31/1982
• Est. Priority Date: 08/27/1979
• Status: Expired due to Term

• Current Assignee: Rowenta-Werke GmbH
• Original Assignee: Rowenta-Werke GmbH
• Inventors: Seifert, Hubert, Conrad, Rainer
• Primary Examiner(s): Bartis, A.
• Application Number:
  US06/178,407
• Time in Patent Office: 746 Days
• Field of Search: 219/245-259, 219/241, 219/242, 219/533, 219/501, 219/496-498, 219/506, 38/74-92, 174/135, 174/46
• US Class Current: 219/251
• CPC Class Codes: D06F 75/26 Temperature control or indicating arrangements
• CPC Class Codes: G05D 23/1913 delivering a series of pulses
• CPC Class Codes: G05D 23/24 the sensing element having a resistance varying with temperature, e.g. a thermistor

Abstract

An electronic temperature control circuit for regulating the soleplate temperature of an electrically heated pressing iron is located in the handle and supporting structure of the iron. The electronic circuit includes a thyristor controlling energization of the soleplate heater and tending to emit heat. The thyristor is mounted to a heat dissipating cooling plate located within a leakproof cavity in the supporting structure remotely from the other electronic components of the control circuit tending to be adversely affected by heat. The cooling plate and thyristor are mounted on a detachable wall closing the cavity and shaped to provide a resting stand which allows the iron to be rested flatly on a horizontal surface without the soleplate contacting the surface.

Claims

1. In a pressing iron comprising a soleplate, an electric heater arranged to heat the soleplate when the electric heater is energized, a supporting structure mounted to the soleplate, a handle supported by the supporting structure and spaced from the soleplate and the electric heater, an electronic temperature control including a temperature sensor responsive to the temperature of the soleplate, a thyristor controlling energization of the electric heater and tending to emit heat, other electronic components tending to be affected adversely by heat, and a cooling plate mounted to the thyristor so as to dissipate heat from the thyristor, the supporting structure having a cavity containing the thyristor and the cooling plate, and the electronic components tending to be affected adversely by heat being located in the supporting structure but outside the cavity at a location remote therefrom, so as to be remote from the thyristor and the cooling plate, as well as from the soleplate and the electric heater, an improvement wherein the cooling plate is mounted to a detachable wall of the supporting structure, wherein the detachable wall is detachable for replacement of the thyristor without separation of other parts of the supporting structure from the soleplate, and wherein the detachable wall is shaped so as to provide a resting stand, which allows the pressing iron to be rested flatly upon a horizontal surface without contact between the soleplate and the horizontal surface.

2. The improvement of claim 1 wherein the detachable wall is shaped so as to close the cavity, which is leakproof when closed by the detachable wall, and wherein a metal plate, which is larger than the cooling plate, is mounted between the cooling plate and the detachable wall in heat exchange relationship with the cooling plate so as to dissipate heat from the cooling plate, and so as to reduce risk of scorching of the horizontal surface by heat emitted from the thyristor to the detachable wall.

3. The improvement of claim 2 wherein the detachable wall has an outer surface, on which the pressing iron can be rested, and which is contoured so as to provide parallel cooling ribs.

4. The improvement of claim 2 wherein the detachable wall has an inner surface, which faces the leakproof cavity, and an outer surface, on which the pressing iron can be rested, and which is larger than the inner surface.

5. The improvement of claim 4 wherein the outer surface is contoured so as to provide parallel cooling ribs.

6. The improvement of any one of claims 1 through 5 wherein the cavity is enclosed by a fixed wall of the supporting structure, a rearwardly extending portion of the supporting structure, and the detachable wall, and wherein the rearwardly extending portion of the supporting structure is shaped so as to provide a storage reel, about which an electric cord for the iron can be wound between outer marginal portions of the detachable wall and outer marginal portions of the fixed wall, and within which the leakproof cavity is located.