US3488471A - Electrically heatable hair curler - Google Patents

Electrically heatable hair curler Download PDF

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Publication number
US3488471A
US3488471A US739236A US73923668A US3488471A US 3488471 A US3488471 A US 3488471A US 739236 A US739236 A US 739236A US 73923668 A US73923668 A US 73923668A US 3488471 A US3488471 A US 3488471A
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US
United States
Prior art keywords
core
strip
curler
shaft
contact
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US739236A
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English (en)
Inventor
Robert Gstalder
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Individual
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Individual
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Publication date
Priority claimed from MC702A external-priority patent/MC663A1/fr
Application filed by Individual filed Critical Individual
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Publication of US3488471A publication Critical patent/US3488471A/en
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Expired - Lifetime legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A45—HAND OR TRAVELLING ARTICLES
    • A45D—HAIRDRESSING OR SHAVING EQUIPMENT; EQUIPMENT FOR COSMETICS OR COSMETIC TREATMENTS, e.g. FOR MANICURING OR PEDICURING
    • A45D4/00—Separate devices designed for heating hair curlers or hair-wavers
    • A45D4/16—Independent devices characterised by heating the hair-curling or hair-waving means before use
    • A—HUMAN NECESSITIES
    • A45—HAND OR TRAVELLING ARTICLES
    • A45D—HAIRDRESSING OR SHAVING EQUIPMENT; EQUIPMENT FOR COSMETICS OR COSMETIC TREATMENTS, e.g. FOR MANICURING OR PEDICURING
    • A45D2/00—Hair-curling or hair-waving appliances ; Appliances for hair dressing treatment not otherwise provided for
    • A45D2/36—Hair curlers or hair winders with incorporated heating or drying means, e.g. electric, using chemical reaction
    • A45D2/367—Hair curlers or hair winders with incorporated heating or drying means, e.g. electric, using chemical reaction with electrical heating means

Definitions

  • the hair curler o-f this invention is totally independent of any wiring or other apparatus, except for an electric plug to which it may be attached without requiring constant supervision, overheating being automatically prevented by a thermostatic control system or device which disconnects the electric heating coil from its electric current supply circuit when the desired temperature of the curler has been attained.
  • Heatable hair curlers of this type comprise a tubular sheath which constitutes the curling roller and a core heated lby an electric resistance element, ywhich core is mounted in the axial bore of the sheath.
  • the thermostatic control device is incorporated in the core.
  • the core includes a hollow cylindrical member of an insulating plastic material over the ⁇ major part of whose length is wound a metallic wire forming a heating coil.
  • An insulating support base held in one end of the bore of the cylindrical core member carries a metallic shaft extending axially into this bore.
  • One of the ends of the heating coil and metallic shaft are connected to the terminals of an electric plug for supplying electric current thereto while their opposite ends are in electric contact with a folded-over, flexible metal strip arranged diametrically transversely of the core member.
  • This strip serves as a thermostatic control when the maximum temperature desired for the hair curler has been attained.
  • the core member When the heating coil is in circuit with the electric supply line and increasingly heats the plastic core member, the core member expands more rapidly than the metallic shaft. As the expansion elon gates the core member axially, it moves the shaft fixed to one of its ends with it. At a given moment in the shaft movement, its point moves out of contact with the metal strip, thus interrupting the circuit supplying the heating c-oil with electric current, and thus ending the heating of the curler.
  • thermocei static device loses its effectiveness and no longer stops the heating of the curler at the desired temperature.
  • thermostatic device which causes a sudden rupture of the circuit between the metallic shaft and the heating coil at one of their ends.
  • This thermostatic device includes a flexible metallic strip of the type of spring steel or the like into which are cut two blade portions on either side of a central axial hole.
  • the peripheral part of the strip around the two like blade portions constitutes a stiifening frame for the strip, and the diameter of the axial hole is slightly smaller than that of a constricted portion of a groove at one end of the central metallic shaft adjacent the point of the shaft.
  • the metallic shaft strip whose two blade portions pivotally engage the metallic shaft groove is arranged in a transverse opening in the heated plastic core member.
  • This transverse opening is at the end opposite to the electric current supply terminals for the shaft and the heating coil, i.e. at the head of the core member, and provides sufficient clearance for the exing of the strip between its concave-and convex end positions.
  • a male plug with two contact pins is provided for supplying electric current to the hair curler when the latter is attached thereto.
  • the plug is detachable from the curler and its terminals are protected by a surrounding collar fixed to,V
  • the collar has flattened upper portions conforming to flat wall portions in a recess of the curler sheath, which conforming portions produce a friction fit and force each plug terminal to be in contact and exact superposition with a corresponding spring contact of the electric supply circuit for the heating coil of the hair curler.
  • FIG. 1 is a side View of a heatable hair curler carrying a detachable male plug, showing the exterior of the curler;
  • FIG. 2 is a longitudinal section of the curler of FIG. 1 along its axis;
  • FIGS. 3a, 3b and 3c show the thermostatic device of the invention, on an enlarged scale, in three stages of the deformation of its flexible contact strip between the positions of being in and out of contact with the heating circuit;
  • FIG. 4 is a bottom view of the flexible contact strip, taken along line C-C of FIG. 3b;
  • FIG. 5 is a horizontal section along line A-A of FIG. 2;
  • FIG. 6 is a horizontal section along line B-B of FIG. 2.
  • the heatable hair curler or curling roller of the present invention is shown to comprise -a hollow cylinder 1 of a suitable plastic material, such as high temperature nylon.
  • the cylinder is formed with ribs or gills 2 for holding the hair in place thereon.
  • the cylinder 1 forms the sheath or outer envelope of the curler, and a hollow cylindrical core 3, also of a plastic material, which may be the same as that of sheath 1, is inserted in the axial bore 11 of the cylinder 1 and held therein by a friction fit.
  • One end 4 of the core projects beyond the sheath and forms the head of the curler which takes up the hair while its other end defines a recess 5 extending transversely of the longitudinal bore 6 of the core and holding the support base 7 of central shaft 8 by a force fit.
  • the shaft may be brass.
  • the core 3 has a peripheral portion of smaller diameter than that of the longitudinal bore in sheath 1 and of slightly shorter length so as to define an annular cavity 9 between the sheath and core, and the two shoulders of the core which form a friction fit with the sheath.
  • An electric resistance 10 is wound about the core in this annular cavity out of contact with the wall of the bore 11 of the sheath.
  • the core Adjacent the projecting head 4 of core 3 and inwardly of, but adjacent, the corresponding end of the sheath 1, the core defines a diametrically extending opening 12 forming a housing for transversely arranged flexible strip 13 of a thermostatic device designed for rapid circuit interruption.
  • the strip 13 may be of chrysocale carrying a silver contact.
  • the strip has a central orifice 26 engaging an annular groove 14 at an end of central shaft 8 remote from its support base 7 and below its point 16, and the housing 12 permits the strip to be flexed into its extreme concave and convex positions shown in FIGS. 3a and 3c, respectively.
  • the central shaft 8 has a screw-threaded end 15 which is mounted for longitudinal adjustment in a screw-threaded axial bore of base support 7 so that the shaft may be longitudinally pre-set for the desired curler temperature.
  • the base support carries two spring contacts 17, 18 one of whose ends are mounted for contact with respective terminals 19, 20 of bi-phase electric plug 21 held by a friction fit in recess 5 of core 3.
  • the spring contact 18 has its other end in contact with the central shaft 8 while the other end of spring contact 17 is connected to heating coil end 21.
  • the other end 23 of heating coil 10 is connected to a contact 23 which is fixedly mounted at the base of opening 12 and engaged by one side of the flexible strip 13 when the curler is assembled (see FIG. 3a).
  • the electric supply circuit for the heating coil 10 is constituted by the following elements: a leaf spring 17, the electric resistance wire forming the coil 10, a fixed contact 23, a flexible strip 13, the metallic central shaft 8, and the other leaf spring 18.
  • This device is constituted by a flexible metallic strip of the type of spring steel or the like, somewhat like a razor blade, which has two like blade portions 24, 25 cut into it at respective sides of central hole 26.
  • the peripheral part of the strip 13 around the two blade portions constitutes a stiffening frame for the strip, and the diameter of hole 26 of the strip is slightly smaller than that of the constricted portion of the groove 14 in central shaft 8.
  • the strip when the strip is mounted on the shaft, its blades 24 and 2S take on a convex (FIG. 3a) or concave (FIG. 3c) shape because they cannot remain in the plane of the sfiffening frame due t0 the flexing power of these blades engaging the constricted portion of groove 14.
  • thermostatic device When the curler is mounted on plug 21, the two spring contacts 17, 18 engage the terminals 19, 20, thus causing the electrical resistance wire 10 to be in circuit and to be supplied with electric current to heat the core 3 and simultaneously the sheath 1 of the curler while the central shaft 8 receives only heat radiated through the wall of core 3, i.e. very little.
  • the shaft will be progressively moved longitudinally by the elongation of the core to which it is attached, as the heating of the core causes such elongation.
  • This will push the strip 13 from its convex position shown in FIG. 3a to a more or less planar position perpendicular to shaft 8, as shown in FIG. 3b.
  • the strip can remain engaged with the shaft only in a concave or convex position of its blades. Therefore, the continued elongation of the core 3 will at one point suddenly force the strip into its concave position shown in FIG. 3c, causing the sudden interruption of the electric supply circuit for the heating coil 10, the spring having been moved away from contact 23. At this point, the curling roller is at the desired temperature for use.
  • the core and sheath progressively return to their original lengths, i.e. their lengths at ambient temperature, the strip is returned to its convex position and the circuit is suddenly closed in the same manner as it was suddenly opened.
  • the plug comprises a cylindrical socket 26 having an axially extending projecting portion 27 insulating the terminals 19 and 20 from each other.
  • the terminals are connected to contact pins 19', 20 of the plug.
  • the socket and projecting portion of the plug are molded in one piece about the electrically conductive terminals and contact pins of a suitable insulating material,
  • a flanged collar 28 is fixed to the socket 26 and extends axially slightly below the socket portion 27 but above the ends of terminals 19, 2f).
  • cylindrical collar 28 has flattened upper portions 29, 30 for frictional engagement with recess 5 of the curler core 3, which has conforming flat wall portions to assure that the spring contacts 17 and 18 come into proper contact with terminals 19, 20 of the plug when the curler is mounted thereon.
  • An electrically heatable hair curler comprising (l) an outer sheath of plastic material having an inner wall defining a longitudinal bore,
  • an electric resistance wire helically wound about the outer wall of the core out of contact with the inner wall of the sheath, said wire forming a heating coil in said annular cavity having one end adjacent the one end of the core and another end adjacent the other core end,
  • an electric current supply circuit being constituted by said terminals, spring contacts, heating coil, metallic strip and central shaft for heating the coil when the curler is mounted on the plug and the plug is connected to a source of electric current
  • the plastic material of the core having a larger coefficient of heat expansion than the metal of the central shaft whereby, upon heating of the core by the heating coil, the plastic core will progressively expand more rapidly than the central shaft, thus moving the shaft longitudinally and taking along the metallic strip which is in pivotal contact therewith until the one blade is out of contact with the one heating coil end and the electric current supply circuit is interrupted to discontinue heating.
  • the hair curler of claim 1 further comprising a plurality of gills on the outer sheath for holding hair in place thereon.
  • the hair curler of claim 1 further comprising anv end of the core projecting outwardly of the sheath beyond the one core end and forming the head of the curler for taking up the hair.
  • the metallic strip has two like blade portions cut thereinto at respective sides of a central hole, a peripheral part of the strip around the two blade portions constituting a stiffening frame for the strip, the other shaft end defines a groove having a constricted portion, the diameter of the central hole being slightly smaller than that of the constricted groove portion and the blade portions pivotally engaging the constricted groove portion of the shaft with the central hole, the flexible blade portions being thus forced out of the plane of the stiffening frame of the strip into a convex or concave end position, and the diametrically extending opening in the core permitting the displacement of the strip with the longitudinal movement of the shaft, a contact in connection with the one heating coil end mounted in said opening and ya mating contact on the metallic strip, said contacts being in circuit in the convex end position and out of circuit in the concave end position.
  • the male electric plug is detachably mounted in the recess and comprises a cylindrical socket having an axially extending projecting portion insulating the terminals from each other, and a anged collar xed to the socket and extending axially slightly below the socket portion but above the ends of the terminals, the collar having a pair of attened upper portions for frictional engagement with conforming flat wall portions of the recess in the core.

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  • Hair Curling (AREA)
US739236A 1967-06-23 1968-06-24 Electrically heatable hair curler Expired - Lifetime US3488471A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
MC702A MC663A1 (fr) 1967-06-23 1967-06-23 Bigoudi chauffant électrique à accumulation de chaleur réglable par thermostat
MC702K MC149A7 (fr) 1967-06-23 1968-05-16 Bigoudi chauffant electrique a accumulation de chaleur reglable par thermostat

Publications (1)

Publication Number Publication Date
US3488471A true US3488471A (en) 1970-01-06

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ID=26640499

Family Applications (1)

Application Number Title Priority Date Filing Date
US739236A Expired - Lifetime US3488471A (en) 1967-06-23 1968-06-24 Electrically heatable hair curler

Country Status (4)

Country Link
US (1) US3488471A (fr)
BE (1) BE716721A (fr)
FR (1) FR1585060A (fr)
MC (1) MC149A7 (fr)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3563251A (en) * 1969-04-11 1971-02-16 Niels Christian Jorgensen Hair curler
US3922521A (en) * 1974-02-25 1975-11-25 Dennis L Viegut Electric hair curling iron
DE2526637A1 (de) * 1975-06-14 1976-12-23 Gress Haarbuerste
US4100397A (en) * 1976-07-08 1978-07-11 The Gillette Company Thermostatically controlled electrical heater assembly
US4109667A (en) * 1976-11-08 1978-08-29 Stackpole Carbon Company Hair setting roller
US4284877A (en) * 1977-08-27 1981-08-18 Matsushita Electric Works, Ltd. Electrically heated hair curler
DE3032983A1 (de) * 1980-09-02 1982-04-15 Braun Ag, 6000 Frankfurt Haarpflege- und frisiersatz
US4477716A (en) * 1982-07-12 1984-10-16 Windmere Corporation Flocked curling iron
US4581519A (en) * 1982-07-12 1986-04-08 Windmere Corporation Flocked curling iron
US4756320A (en) * 1984-04-13 1988-07-12 Outboard Marine Corporation Hair curling appliance with a heating element comprising a heating wire wound around an inner core
US5808275A (en) * 1995-02-01 1998-09-15 Dalal Kana Fani Hibri Hair shaping apparatus with electrically heated rollers
US6310322B1 (en) * 2000-05-05 2001-10-30 Raymond Industrial Limited Heated roller and heated roller assembly
US20180343996A1 (en) * 2017-06-05 2018-12-06 Chin-Chun Yu Curling Iron

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1884232A (en) * 1928-11-24 1932-10-25 Bosch Robert Electrical heating device for curling tongs
US2475376A (en) * 1946-02-28 1949-07-05 A P Drayton Soldering iron
GB651924A (en) * 1948-07-16 1951-04-11 Patrick Francis Aloysius Grein Improvements in or relating to electric permanent hair waving appliances
GB663214A (en) * 1949-01-13 1951-12-19 H M Postmaster General Improvements in or relating to soldering irons

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1884232A (en) * 1928-11-24 1932-10-25 Bosch Robert Electrical heating device for curling tongs
US2475376A (en) * 1946-02-28 1949-07-05 A P Drayton Soldering iron
GB651924A (en) * 1948-07-16 1951-04-11 Patrick Francis Aloysius Grein Improvements in or relating to electric permanent hair waving appliances
GB663214A (en) * 1949-01-13 1951-12-19 H M Postmaster General Improvements in or relating to soldering irons

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3563251A (en) * 1969-04-11 1971-02-16 Niels Christian Jorgensen Hair curler
US3922521A (en) * 1974-02-25 1975-11-25 Dennis L Viegut Electric hair curling iron
DE2526637A1 (de) * 1975-06-14 1976-12-23 Gress Haarbuerste
US4100397A (en) * 1976-07-08 1978-07-11 The Gillette Company Thermostatically controlled electrical heater assembly
US4109667A (en) * 1976-11-08 1978-08-29 Stackpole Carbon Company Hair setting roller
US4284877A (en) * 1977-08-27 1981-08-18 Matsushita Electric Works, Ltd. Electrically heated hair curler
DE3032983A1 (de) * 1980-09-02 1982-04-15 Braun Ag, 6000 Frankfurt Haarpflege- und frisiersatz
US4477716A (en) * 1982-07-12 1984-10-16 Windmere Corporation Flocked curling iron
US4581519A (en) * 1982-07-12 1986-04-08 Windmere Corporation Flocked curling iron
US4756320A (en) * 1984-04-13 1988-07-12 Outboard Marine Corporation Hair curling appliance with a heating element comprising a heating wire wound around an inner core
US5808275A (en) * 1995-02-01 1998-09-15 Dalal Kana Fani Hibri Hair shaping apparatus with electrically heated rollers
US6310322B1 (en) * 2000-05-05 2001-10-30 Raymond Industrial Limited Heated roller and heated roller assembly
US20180343996A1 (en) * 2017-06-05 2018-12-06 Chin-Chun Yu Curling Iron
US10624435B2 (en) * 2017-06-05 2020-04-21 Chin-Chun Yu Curling iron

Also Published As

Publication number Publication date
BE716721A (fr) 1968-12-02
MC149A7 (fr) 1969-05-20
FR1585060A (fr) 1970-01-09

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