US1551048A - ohlenbusch - Google Patents

Description

Aug; 25, 1925' J. M. OHLENBUSCH ELECTRIC HEATER FOR HAIR WAVING Filed April 4. 1 924 ATTOR V v I WITNESSES Patented Aug. 25, 1925.

UNITED STATES F ICE.

PATENT OF JOHN M. OHLENBUSGH, OF NEW YORK, N. Y.

Application filed. April 4,

To all whom it may concern:

Be it known that I, JOHN M. OHLEN- BUSGH, a citizen of the United States, and a resident of the city, county, and State of New York, have invented certain new and useful Improvements in Electric Heaters for Hair Waving, of which the following is a specification.

In hair waving apparatus now generally in use for efiecting so-called permanent waves in the hair while on the human head, a plurality of electric heaters for the hair are employed, sometimes as many as forty, each of which is independently supported by a cord carrying a counter weight or balance for the heater at the other end. The heaters are hollow or tubular, and each is adapted to receive in its bore a portion of the hair which has been tightly wound on a core or curler and suitably covered.

The present invention relates to electric heaters of the type just described. One object is to provide a heater, which will be neat in appearance, simple and inexpensive to manufacture, and which will at the same time be thoroughly durable. Another object is to provide a heater so formed and arranged as to reduce to a minimum the transfer of heat from the tubular heating portion to the handle of the device. Other and further objects and features of the invention will appear hereinafter in the specification and will be more particularly pointed out in the annexed claims.

The invention will now be described, by way of example, with reference to the accompanying drawings, in which two embodiments thereof are illustrated, and in which like reference numerals in the several figures designate like parts.

In said drawings Fig. 1 is a perspective view showing a complete electrical heater according to the invention;

Fig. 2 is a central longitudinal section through the device;

Fig. 3 is a sectional view through the shank and the shank engaging portion of the handle, taken along the line 33 of Fig. 2;

Fig. 4 is a view partly in section and partly in elevation, taken along the line 4c-t of Fig. 3;

Fig. 5 is a section taken along line 55 of Fig. 3;

Fig. 6 is a section, corresponding to the ELECTRIC HEATER FOR HAIR WAVING.

1924. Serial No. 704,161.

view in Fig. 3, illustrating a modification in dwhich the shank is made in two parts; an

Fig. 7 is a view, similar to that of Fig. 4, of the modification of Fig. 6.

Referring more specifically to the drawings, the heater may be said to be composed of three principal parts, namely the shank 10, the handle 11, and the tubular heating portion 12.

The shank 10 is preferably made of a heat insulating material, and for this purpose I have found asbestos highly satisfactory, not only because it is heat insulating, but also because it is an electrical insulator, and because it can be moulded into the form required.

In the embodiment of the invention illustrated in Figs. 1 to 5 inclusive, the shank 10 is shown as formed of a single piece of moulded asbestos, and provided with the lateral extension 13 at one end which will be referred to as the outer end. A passage 14: (Fig. 3) passes through the center of the main body of the shank and leads into an oblong recess 15 provided in the face of the shank at the outer end. Two other passages or circular recesses 16 and 17 run part way through the shank, parallel with the passage 1 1. These passages or recesses 16 and 17 continue on to the recess 15 through smaller communicating holes or passage-s which are just large enough to accommodate the shanks of screw bolts 18 and 19, but are not large enough for the heads of these screw bolts to pass through. The heads therefore abut against the bottoms of the recesses or passages 16 and 17 as shown.

The screw bolts 18 and 19 serve as terminals for the electric lead in wires 20 and 21 and also for the ends 22 and 23 of the electric heating wire which extend from within the tubular heating portion 12. Just how the ends of this electric heating wire are lead in to the terminals 18 and 19 will be described later. 20 and 21 are brought in through the passage 14, and are then secured in the usual way to the terminals 18 and 19 by screwing down the nuts 18 and 19 The recess 15 provided in the face of the outer end of the shank adjacent the tubular heating portion 12, is preferably of sufficient size to fully accommodate the lead in wires and the terminals 18 and 19, so that they will not project beyond the line of the outer face The electric lead in wires of the shank. After the electrical connections are made the flat plate or cover 24 is placed over the outer face of the shank, and is secured thereto by means of a screw 25. The plate is also held in position by the engagement of the ends of the legs of the U-shaped handle 11 therewith at each side, and by the conformity of its lower edge to the contour of the tubular heating port-ion 12. It may be found desirable to groove the under surface of the plate 24 somewhat, between the recess 15 and the tubular heating portion 12, so that the plate as a whole will lie fiat against the face of the shank but will at the same time allow space for the ends of the heating wire running from the tubular heating portion to the terminals in the recess.

The U-shaped handle 11 is preferably made of metal having a certain amount of spring to it, so that the legs thereof may be sprung into position along the sides of the shank 10. The inside surfaces of the ends of the legs are corrugated as shown, so that the shank is engaged only by the ridges 26 of said corrugated surface. The purpose of this construction is not only to secure a good grip on the surface of the shank 10, but more particularly to prevent as far as possible the conduction of heat from the shank to the handle. Although asbestos is a good heat insulator, the heating portion 12 is kept at such a high temperature for such a length of time that as a rule a certain amount of heat does pass into the shank 10. It is therefore desirable to reduce as much as possible the transfer of this heat into the handle 11, and it is for this purpose that the shank engaging surfaces of the handle are corrugated. The handle 11 is further secured to the shank 10 by means of the screws 27. The holes 26' through the shank are air holes to assist in cooling the shank and to reduce heat conduction therethrough.

The tubular heating portion is formed of the two concentrically arranged metal tubes 29 and 30, together with two layers 81 and 32 of coiled electric heating wire interposed between the two tubes and insulated therefrom by layers of mica or other suitable insulating material 33, 34, and 35. In constructing the device a layer 33 of insulating material is placed around the inner tube 29. Then a single wire of suitable length and electric re sistance is wound or coiled around said tube from a point near the inner end outward to form coiled layer 31. After the wire has been coiled out to a point adjacent the end, a layer 34 of insulating material is placed around the tube over the coiled layer 81, and the wire is then coiled back over insulating this layer 34. An insulating layer 35 is then placed over the coiled layer 32. After this has been done the outer tube 30 is placed over the whole. The outer tube, as shown,

is shorter than the inner tube by an amount substantially equal to the thickness of the lateral extension 18, and the outer ends of the tubes are brought substantially into alinement, so that the inner end of tube 30 is short of the inner end of tube 29 by the difference in their lengths. The inner end of tube 29 is passed through the aperture provided therefor in the lateral extension 13, and is then expanded or flared outward at its end as indicated at 86 to seat it snugly in the aperture and so that it cannot pass through the aperture in an outward (left hand) direction. Before being placed over the inner tube 29, the outer tube 30 is flared slightly as indicated at 37, and is cut away to a slight extent at 38 so as to permit the ends 22 and 23 of the heating wire to be led therefrom between the tube and lateral extension 13. After inner tube 29 has been seated, the outer end thereof is expanded or flared outwardly as indicated at 39 so as to engage the outer end of tube to close off the space between tubes 29 and 30 and to hold the inner end of tube 30 flush against extension 13. By this construction, it will be noted that the tubular heating portion is firmly secured to the lateral extension of the shank in a very simple manner, and that the outer edge of the two tubes, or in other words the outer edge of the tubular heating portion, is closed off, so that the heating coil is not exposed.

As the two ends 22 and 23 of the heating coil or wire emerge from the tubular heating portion (see Fig. 1) they run laterally along the face of the shank and extension until they reach the edge of the recess 15 when they drop down and are secured to the terminals 18 and 19. In securing the ends to the terminals it is a good plan to twist them around the lead in wires 20 and 21. In order to prevent the two lines of wire as they extend along the face of the shank and its extension, from coming into contact with each other, a piece of mica 4:0 is slit and placed over the wires, as shown, so that it lies over most of one exposed line and extends under the other exposed line.

In the modification of the invention shown in Figs. 6 and 7. the shank and its lateral extension are formed in two pieces. The one piece 1O includes the extension, and is of practically uniform thickness throughout. In this construction of the device the two lead in wires are connected to the terminals at a point between the two parts of the shank. The terminal bolts, however, pass through the two parts of the shank, and thus not only serve as terminals, but also serve as bolts for binding the two parts of the shank together. The shank part 10 is provided with two small passages 41 and42 through which the two ends of the heating wire pass in order to reach the terminals.

In this particular modification of the inven tion, the outer face of the shank is not recessed as in the case of the modification shown in Figs. 1 to 5 inclusive, although two circular recesses are provided there for the nuts on and the ends of the two terminal bolts. A recess 4L3 is provided, however, on the inner part to accommodate the lead in wires and the heating wire.

While I have described in detail the construction of two embodiments of my invention, it will be understood of course, that minor modifications of the construction shown may be made without departing from the spirit of my invention.

I claim 1. In an electric heater for hair waving, a tubular heating portion, an asbestos shank carrying said portion, and a handle secured to said shank.

2. In an electric heater for hair waving, a tubular heating portion, a moulded asbestos shank carrying said portion, and a handle secured to said shank.

3. In an electric heater for hair waving, a tubular heating portion, a heat insulating shank carrying said portion,and a U-shaped handle having its legs secured to the sides of said shank.

4. In an electric heater for hair waving, a tubular heating portion, a heat insulating shank carrying said portion, and a handle provided with corrugated surfaces and engaging and secured to said shank only along the teeth of said corrugated surface.

5. In an electric heater for hair waving, a tubular heating portion, a heat insulating shank carrying said portion, and a U-shaped handle having corrugations upon its inside surface adjacent the ends of its legs and engaging and secured to said shank only along the teeth of said corrugated surface.

6. In an electric heater for hair waving, a tubular heating portion, a heat insulating shank having a lateral extension carrying said portion, and a U-shaped handle having its legs secured to opposite sides of the main body of said shank, the handle and the tubular heating portion extending in parallel and opposite directions from said shank.

7. In an electric heater for hair waving, an electrical insulating shank having a lateral extension, a handle secured to the main body of said shank, a tubular heating portion having an end seated in said lateral extension, a passage for lead in wires in said shank, spaced terminals for said lead in wires in said shank, and an electric heating wire in said heating portion and having its ends extending from said portion and connected to said terminals.

8. In an electric heater for hair waving, an electrical insulating shank having a lateral extension, a handle secured to the main body of said shank, a tubular heating portion having an end seated in said lateral extension, a passage for lead in wires in said shank, spaced terminals for said lead in wires in said shank, an electric heating wire in said heating portion and having its ends extending from said portion and connected to said terminals and passing over said extension from said tubular heating portion to said terminals, and a sheet of insulating material lying over one exposed line of said heating wire and extending under the other exposed line of said heating wire to keep the two exposed lines from coming into contact with each other.

9. In an electric heater for hair waving, a shank having a lateral extension, a handle secured to the main body of said shank, and a tubular heating portion carried by said lateral extension, said tubular heating portion comprising two substantially concentric tubes and an electric heating wire interposed therebetween and insulated therefrom, the inner tube extending out beyond the outer tube at one end and passing through and spread into a seat in an aperture in said extension and the outer tube abutting against the extension.

10. In an electric heater for hair waving, a shank having a lateral extension, a handle secured to the main body of said shank, and a tubular heating portion carried by said lateral extension; said tubular heating portion comprising two substantially concentrically arranged tubes, the inner tube projecting beyond the outer tube at one end and being substantially in alinement and in rigid engagement therewith at the other end, and the projecting end of the inner tube passing through and seated in an aperture in said extension and expanded to engage the boundary surface of said aperture at one side of said extension, and the adjacent end of the outer tube abutting against the opposite side of said extension, whereby the tubular heating portion is rigidly secured in and to said shank extension.

JOHN M. OI-ILENBUSCH.

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