US4097718A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for heat treating hair on the human head, and the like hair curling device having self-regulating PTC heater
Assignee: Braun GmbH
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Filing: 1976-01-14
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Granted: 1978-06-27
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Expires: 1996-01-14
Abstract
Abstract A hair curler includes an apertured cylindrical shell about which hair to be curled is wound. Mounted within the shell are two semicylindrical mounting components which donfine between themselves a plurality of spaced apart pill-shaped PTC resistor bodies. The engaging surfaces of the pill-shaped resistor bodies and of the semicylindrical mounting components are complementary and cylindrical, to establish good electrical and thermal contact between the engaging surface portions. Voltage is applied across the two semicylindrical mounting components, causing the generation of heat within the PTC resistor bodies. The PTC action of the latter causes an automatic limiting of temperature, preventing damage to hair. The generated heat is transmitted to a heating plate in contact with a wick extending into a water container. Water evaporates from the wick and steam passes into the interior of the apertured cylindrical shell, out through the apertures thereof, and into contact with the hair wound around the curler.
Inventors
- 👤 Hans Joachim Weise
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:03
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/10; H05B3/12; H05B3/14; H05B3/141; A; A45; A45D; A45D1/00; A45D1/02; A45D1/04; A45D1/28; H01; H01C; H01C7/00; H01C7/02; H01C7/022; A45D2001/008
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
193 words
A heat-treating device, particularly for treating hair, comprising in combination, an outer hair-engaging structure about which hair to be curled or waved can be wound, the hair-engaging structure including holding means for holding hair in position on the hair-engaging structure; a combined heating and temperature regulating means within a cylindrical bore in the hair-engaging structure and including mounting means comprising a pair of mounting components made of thermally and electrically conductive material and defining an intermediate gap, and a plurality of cylindrical PTC resistor bodies located in the gap confined between the pair of mounting components in electrically conductive and thermally conductive engagement with the holding components, said PTC resistor bodies being spaced apart from one another within said gap; and means for applying a voltage across the pair of mounting components to establish a flow of heating current through the PTC resistor bodies, the mounting components being elongated generally semi-cylindrical components electrically connecting the cylindrical PTC resistor bodies in parallel, and the contacting surface portions of the mounting components and of the cylindrical PTC resistor bodies being cylindrical and complementary, thereby establishing good thermal and electrical contact between said contacting surface portions.
Claim 2
Dependent Claim
193 words
A heat-treating device, particularly for treating hair, comprising in combination, an outer hair-engaging structure about which hair to be curled or waved can be wound, the hair-engaging structure including holding means for holding hair in position on the hair-engaging structure; a combined heating and temperature regulating means within a cylindrical bore in the hair-engaging structure and including mounting means comprising a pair of mounting components made of thermally and electrically conductive material and defining an intermediate gap, and a plurality of cylindrical PTC resistor bodies located in the gap confined between the pair of mounting components in electrically conductive and thermally conductive engagement with the holding components, said PTC resistor bodies being spaced apart from one another within said gap; and means for applying a voltage across the pair of mounting components to establish a flow of heating current through the PTC resistor bodies, the mounting components being elongated generally semi-cylindrical components electrically connecting the cylindrical PTC resistor bodies in parallel, and the contacting surface portions of the mounting components and of the cylindrical PTC resistor bodies being cylindrical and complementary, thereby establishing good thermal and electrical contact between said contacting surface portions.
Claim 3
Dependent Claim
21 words
A hair-treating device as defined in claim 1, wherein the material of the PTC resistor bodies is a ceramic semiconductor material.
Claim 4
Dependent Claim
49 words
A hair-treating device as defined in claim 1, wherein the positive temperature coefficient of the material of the pill-shaped PTC resistor bodies is so high that above a certain temperature temperature increases produce corresponding heating current decreases counteracting such temperature increases so fully as to afford a thermostatic regulation.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-26 | 1981-12-26 | 1982-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-26 | 1985-12-26 | 1986-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-26 | 1989-12-26 | 1990-06-27 | $7700.00 | Window Closed / Lapsed |