US 3581056 A
Description (OCR text may contain errors)
United States Patent  Inventor Richard Djenner Holte, Denmark  Appl. No. 817,006  Filed Aprt 17, 1969  Patented May 25, 1971  Assignee Olaf Bendik Elmer Copenhagen, Denmark  Priority Apr. 19, 1968  Denmark  1740/68  HAIR CURLER HAVING A HIGH HEAT STORAGE CORE TELESCOPICALLY MOUNTED THEREIN 4 Claims, 2 Drawing Figs.  11.8. CI 219/222, 132/33, 132/117  Int. Cl A45d 2/24  Field of Search 219/222- 226, 242; 132/33, 38, 39,117  References Cited UNITED STATES PATENTS 1,040,167 10/1912 DeMond 132/117 Primary Examiner-R. F. Staubly Attorney-Raymond A. Robic ABSTRACT: Hair curler including a cylindrical wall made of plastic material and a guide tube provided with stop means adjacent each end thereof and mounted within such cylindrical wall so as to form an air space between the cylindrical wall and the guide tube. A central core having substantially the same length as the curler itself and made of a material having a large specific heat is adapted for axial displacement within the guide tube between a first position in which it is completely inserted into the curler and a second position in which one end of the core is projecting from the curler. The core has means cooperating with the above end stops for stopping the core at the above mentioned first and second positions. Pressure means are associated with the core and the guide tube for providing sufficient friction against displacement of the core' with respect to the tube.
PATENTED was I971 3581. 056
INVENTOR Richard DJENNER ATTORNEY The core is heated up to several hundred degrees and must therefore be provided'with an isolated finger knob, so that the operator will not burn herself. It takes a lot of time and work to remove the cores from a large number of curlers, heat them and replace them in the curlers.
The object of the invention is to create a novel hair curler which is considerably easier to use so that both time and work is saved.
This is according to the invention obtained by the fact that the core is adapted for axial displacement between a position, in which it is completely'inserted in the curler, and another position, in which one end of the core is projecting from the curler.
- When the core is projecting from one end of the curler, the curler may be placed in a vertical position on a hot plate, a flatiron or the like, whereby the core is heated to the desired temperature. Thus, the curler wall which is ordinarily made of plastic will have such distance from the heat source that it cannot be damaged. After the heating of the core, the operator grasps thecurler wall and shakes'the core axially into the inserted position. These operations can be carried out much quicker and easier than a removal of the cores from the curlers with subsequent heating and reinsertion. The insulated finger knobs On the cores can also be dispensed with.
According to the invention, the projectable end of the core may have an endportion with increased thickness, whereby the heat transmission from the hot plate to the core is improved, so that the heating time is reduced.
A practical embodiment of the invention is characterized in that the core is slidable in a guide tube being provided with two end stops corresponding to the inserted and projecting position of the core. Thereby, the two end positions of the core are determined, and the core is centralized in the curler.
In order to prevent the core from being pushed out from the curler at the wrong moment, whereby the user could burn her fingers, the structure may be such that a radial bore in the core contains a spring loaded part being pressed by the spring means against. the inner side of the guide tube. Thereby, a suitable friction against the displacement of the core in the curler may be obtained. Thus, it is only possible to push the core into and out of the curler by shaking the curler strongly, almost as by operating a clinical thermometer.
According to the invention the core may be axially prolonged by a central spindle projecting from one end face of the core and being slidably guided by suitable bearing means in the interior of the curler. Thereby, it is possible to slide the core completely out of the curler, so that the whole of the core 7 may be heated quickly in a suitable pocket in a heating apwhich one end of the core is projecting from the comb.
The invention will now be disclosed with reference to an embodiment of a hair curler according to the invention, and to the accompanying drawings in which:
FIG. I shows the hair curler in a broken longitudinal section, and
FIG. 2 the same, seen from the outside with a projecting core.
The hair curler has a cylindrical curler wall I of plastics. At the ends of the curler are transverse walls 2 of insulating material having holes for receiving a guide tube 5, in which a core 4 of solid metal is axially slidable. The guide tube 5 has an axial slot 6 in which a pin 7 screwed onto the core 4 is slidable. The slot 6 forms an end stop for the core 4 in the inserted position of the core as shown in FIG. I, and in the projecting position of the core as shown in FIG. 2. In a radical bore in the core 4 is received a pressure spring urging a ball 8 out against the inner side of the guide tube 5, whereby a sufficient friction against the displacement of the core 4 is obtained, so that the core is not pushed out from the curler at the wrong moment.
The outer side of the guide tube 5 is chromium plated, so that the heat radiation is kept as low as possible, whereby an exaggerated steam generation in the hair is avoided. Between the guide tube 5 and the curler wall I is left an air space 9 insulating the hot core 4 from the curler wall I.
The curler wall 1' has a number of cutouts 3 through which heat radiation for drying the hair can pass.
When the core 4 is projecting from the guide tube as shown in FIG. 2, the thickened end thereof is placed on a hot plate, a flatiron turned upside down, 'or the like, whereby the core 4 may be heated up to several hundred degrees C.). Thereafter the core 4 is shaken into its inserted position shown in FIG. 1.
The core 4 may also consist of a tube containing a liquid having a large specific heat.
1. Hair curler comprising:
a. a cylindrical curler wall made of plastic material;
b. a guide tube provided with end stops adjacent each end thereof. and mounted within said wall so as to form an air space between said wall and said guide tube;
. a central core having substantially the same length as the curler itself and made of a material having a large specific heat, said core being adapted for axial displacement within said guide tube between a first position in which it is completely inserted into the curler and a second position in which one end of the core is projecting from the curler, said core being provided with means cooperating with said end stops for stopping the core at said first and second positions corresponding to the inserted and projecting positions of the core; and
d. pressure means associated with said core and said guide tube for providing sufficient friction against displacement of said core into said guide tube.
2. Hair curler as claimed in claim 1, characterized in that the projectable end of the core has an end portion with increased thickness.
3. Hair curler as claimed in claim 1, characterized in that said pressure means includes a spring loaded part located in a radial bore of said core and urged against the inner side of the guide tube.
4. Hair curler as claimed in claim 1, characterized in that the core is axially prolonged by a central spindle projecting from one end face of the core and being slidably guided by suitable bearing means in the interior of the curler.