JPS5852643B2 - hair curler - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a metal tube in which a heating element 3 is sandwiched between bottomed cylindrical metal tubes 2a and 2b having resin flow holes 1a and 1b, and a metal tube in which the heating element 3 is sandwiched. 2a and 2b are enclosed in a hair wrap side 4 made of synthetic resin.

This hair curler is characterized in that the outer circumferential wall of 2b is used as a winding trunk, and its purpose is to provide a hair curler in which the resin flows smoothly when the bottom shape is formed, and there is no risk of deformation of the metal tube. is to provide.

The present invention will be explained in detail below with reference to Examples.

The heating element is a self-humidity control heating element such as a thermistor with a positive temperature coefficient, and is disposed between two metal cylinders 2a and 2b, each of which has a bottom, and is made of a highly conductive metal.

As shown in FIGS. 2 and 3, a long resin flow hole 1a is bored in the side wall of one of the metal cylinders 2a, and a resin flow hole 1a is formed in the bottom side of the side wall of the other metal cylinder 2b. Hole 1b is drilled.

The resin flow holes 1a may be staggered small holes as shown in FIG. 4, or may be a group of small holes as shown in FIG.

The terminal body 5 is formed by providing a tubular second terminal 8 on the outer periphery of a rod-shaped first terminal 6 via an insulator 7, and the first terminal is connected between the bottoms of the metal tubes 2a and 2b with the heating element 3 interposed. The pair of metal tubes 2a, 2b and the heating element 3 are integrated by inserting the base of the first terminal 6 and screwing the nut 10 onto the male screw portion 9 at the base end of the first terminal 6. 6. Current flows through one metal tube 2a, the heating element 3, the other metal tube 2b, and the second terminal 8.

A pair of metal tubes 2 a t 2 b assembled in this way
is inserted into the hair wrap side 4 made of synthetic resin such as thermoplastic polyester elastomer, and a large number of protrusions 11 are protruded from the outer periphery of the hair wrap side 4.

A nut covering protrusion 13 is protruded from the upper web 12 in the hair wrapping side 4, and a temperature indicating tape 14 whose color changes depending on the temperature is attached to the top surface of the nut covering protrusion 13.

Furthermore, 15 in the figure is a lower web.

Next, the bottom shape of the hair curling side 4 of the hair curler formed as described above will be explained.

The metal tube 2 a t 2 b sandwiching the heating element 3 is inserted into the injection mold, and the gate position 1 on the center line of the hair wrapping side 4 is inserted.
The tip of the gate is positioned at 6 and the synthetic resin is injected into the injection mold.

Then, as shown by the arrow, the resin flows from the inside 17 of the metal tube 2a to the outside 18 of the metal tube 2a through the resin flow hole 1a, and the metal tube 2
It flows to the outside 19 of b and flows to the inside of the metal tube 2b from the resin flow hole 1b.

The resin flows in this way, but if there are no resin flow holes 1a and 1b, the resin that has flowed into the gate position 16 will flow from the inside 1T of the metal cylinder 2a to the outside 18 over the upper end of the metal cylinder 2a.
The resin flows to the outer side 19 of the metal tube 2b, and the resin flow length becomes longer as a whole, and the inner side 17 and the outer side 18 of the metal tube 2a become longer.
A pressure difference is generated between the metal cylinder 2a and the side wall of the metal cylinder 2a is deformed outward.

Further, the lower web 15 is not filled with resin.

However, by providing the resin flow holes 1a and 1b, the resin flowing from the gate position 16 flows to the inner side 17 through the inner bottom surface of the metal cylinder 2a, and is divided into the inner side 17 and the outer side 18 at the resin flow hole 1a, and flows to the inner side. The pressure difference between 17 and the outside 18 is alleviated, preventing deformation of the side wall of the tag metal cylinder 2a, and shortening the resin flow length.

Furthermore, by providing the resin flow holes 1b, the lower web 15 is also filled with resin.

In addition, in the resin flow holes 1a and lb, the hole edges of the holes are arranged on the inclined surface 2.
If it is set to 2, the resin will flow even more smoothly and filling will be carried out more accurately.

Further, when there is a gate at the gate position 16 on the center line, the metal tube 2a is inserted.

The resin flow to the metal tube 2b becomes uniform, making it possible to perform well-balanced molding as a whole.

The resin having the highest injection pressure does not flow into the weakest part of the end surface 21 of the metal cylinder 2a.

Deformation of 2b can be prevented.

Furthermore, the operation of the hair curler configured as described above will be explained.

When the terminal body 5 is inserted into a socket and the heating element 3 is energized, the heat of the heating element 3 is transmitted to the metal tubes 2 a and 2 b, and the hair curl side 4 is heated.

When the temperature of the heating element 3 approaches a predetermined temperature, the resistance value increases, and it becomes difficult for current to flow through the heating element 3, so that the winding drum is not heated above the predetermined temperature.

Further, when the heating element 3 reaches a predetermined temperature, the color of the temperature indicating tape 14 changes to indicate that the hair wrap side 4 has reached the predetermined temperature.

When the hair wrapping side 4 reaches a predetermined temperature in this way, the terminal body 5 is pulled out from the socket and the hair is wrapped around the hair wrapping side 4 to curl it.

As shown in FIG. 4, by making the resin flow holes 1a staggered, the temperature drop point caused by the resin flow holes 1a to the hair curling side 4 will not be concentrated in a certain direction, and the curling time will be uniform. , you can expect uniform curls throughout your hair.

As described above, the present invention has resin flow holes in the metal cylinder, so
When injection molding the hair wrap side, resin can be introduced from the gate position approximately in the center in the longitudinal direction, and the injected resin flows onto the inner surface of the metal tube and directly onto the outer surface of the metal tube through the resin flow hole. The flow length of the resin from the gate position to the end is short, and even if there is a metal tube as an insert, the resin flows smoothly to the end, forming a uniform resin coating, allowing for high-quality molding and effective molding. The inner surface of the bottom metal tube and the heating element can also be coated with resin, and the pressure difference between the inside and outside of the metal tube can be equalized to prevent deformation of the metal tube, so the resin coating on the hair wrap side can be formed uniformly on the inner and outer surfaces of the metal cylinder, and this has the advantage that when using the hair curler, the body is heated to a uniform temperature and beautiful curls can be created.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a perspective view of the same metal tube as above, FIG. 3 is a side view of FIG. 2, FIG.
FIG. 5 is a side view of another embodiment of the metal tube same as above,
1a and 1b are resin flow elements, 2a and 2b are metal cylinders, 3 is a heating element, and 4 is a hair curling side.

Claims (1)

[Claims] 1 A heating element is sandwiched at the bottom of a bottomed cylindrical metal tube, and a plurality of resin flow holes are formed in the outer peripheral wall of the metal tube, and the metal tube with the heating element sandwiched is inserted into a hair wrapping body made of synthetic resin. A hair curler characterized in that the outer circumferential wall of a metal tube enclosed within the hair curler is used as a winding body.