Heated hair styling device

A hair styling device includes an elongated first leg having a top surface, a bottom surface, a styling end and a handle end, and an elongated second leg pivotally secured to the first leg between an open and a closed position. The second leg has a top surface, a bottom surface, a styling end and a handle end. A plurality of teeth are disposed on at least one of the top surface of the first leg and the bottom surface of the second leg. Respective styling ends of the first and second legs are configured to nest together in the closed position to define a space on the styling end configured such that hair can flow freely through the space as the device is passed through a subject's hair.

FIELD OF THE INVENTION 
The present invention relates generally to heated hair styling devices 
similar to hair curling irons or curling brushes, and more particularly, 
to multi-functional hair curling/straightening devices with brushing 
ability having first and second legs. 
BACKGROUND OF THE INVENTION 
Hair curling irons and curling brushes are well known in the prior art. 
Most conventional curling irons utilize a smooth, elongated tubular barrel 
secured to a handle, with a heating element inside the tube. An unheated 
clamp extends along a portion of the barrel for the purpose of clamping or 
holding sections of hair against the round barrel. Heat that is 
transferred from the heating element to the barrel causes hair which is 
wrapped around the barrel to retain a curl after the hair is removed from 
the curling iron. This type of device is used primarily to create "flat" 
or spiral curls which mimic the effect of a roller set. However, the curls 
are somewhat flat and ribbon-like. Also, the clamp on the curling iron 
tends to crimp hair at its edges, which is an undesired look. Flat hair 
styling irons are also known which are used to straighten hair with no 
curvature. A known drawback of these devices is that only flat, pressed 
hair is obtained, which looks unnatural. 
Heated hair curling brushes use a barrel that has elongated teeth to catch 
and comb the hair while the hair is being curled. Since they usually do 
not have a clamp, curling brushes do not produce the sharp ribbon-like 
curls of a curling iron, and tend to make soft curls or styles. The teeth 
on the barrel reduce clumping by separating the hair strands, and because 
of the absence of the clamp, the crimping effect of curling irons is 
alleviated. One drawback of a curling brush is the inability to press 
naturally curly hair for straightening purposes. 
While conventional curling irons provide virtually complete control over 
the styled hair, as far as providing the stylist the desired results, 
curling brushes do not provide such control. In fact, the stylist has no 
control as to exactly how the hair will look after being styled with a 
curling brush. 
Another conventional hair styling device is known as a crimper and is used 
for straightening curly hair. Crimpers include a pair of opposed, flat, 
heated surfaces which are pressed together with a section of hair in 
between to be straightened. A disadvantage of crimpers is that they 
provide an unnatural "pressed" look to the hair. 
Thus, there is a need for a hair styling device which allows the user or 
stylist to selectively introduce natural-type soft curls, or to press 
curly hair for straightening or subsequent styling of the hair. 
Accordingly, one object of the present invention is to provide a new and 
improved hair styling device which provides the stylist with more control 
over the styled hair. 
Another object is to provide a new and improved hair styling device which 
provides the natural soft curl a curling brush provides, while also having 
the ability to either curl or straighten the hair as the user desires, and 
to provide a natural looking heat-treated hairstyle. 
SUMMARY OF THE INVENTION 
These and other objects are met or exceeded by the present hair styling 
device. An important feature of the present device is that it combines the 
positive aspects of both curling irons and styling brushes while avoiding 
their drawbacks. 
In keeping with one aspect of the invention, a heated hair styling device 
includes two legs which are pivotally connected to each other and biased 
in an open position. When the two legs are moved into the closed position, 
a plurality of ridges define a space between the two legs. This space 
allows most of the hair to move freely through the space when the styling 
device is pulled over the hair, creating a more natural looking curl than 
that provided by a conventional curling iron. Specially configured ridges 
allow the user to apply a selective braking force on some of the hair 
which controls the amount of heat applied. The first leg may include a 
smooth bottom surface which can be rubbed over curly hair, effectively 
straightening it. Also, the ends of the first leg and second leg may be 
releasably locked together by a latching mechanism. The user or stylist 
may then use the device as a conventional curling brush, or to press curly 
hair upon a relatively smooth heated surface of the device for styling or 
straightening. 
More specifically, the present invention provides a hair styling device 
which includes an elongated first leg having a top surface, a bottom 
surface, a styling end and a handle end, and an elongated second leg 
pivotally secured to the first leg between an open and a closed position. 
The second leg has a top surface, a bottom surface, a styling end and a 
handle end. A plurality of teeth are located on at least one of the top 
surface of the first leg and the bottom surface of the second leg. 
Respective styling ends of the first and second legs being configured to 
nest together in the closed position to define a space on the styling end 
such that most of the hair can flow freely through the space as the device 
is passed through a subject's hair. 
The first leg and the second leg of the hair styling device are attached to 
each other at a pivot point. The second leg is nestably engaged with at 
least the top of the first leg, allowing the first leg and the second leg 
to be brought together and rotated axially as a unit. When the first leg 
and the second leg are brought within proximity of each other, a space is 
created between the first leg and the second leg, allowing most of the 
hair to flow freely between the first leg and the second leg in a 
controlled manner. To aid in the controlled flowing of the hair, teeth are 
provided in rows at least in the space. Additional teeth are optionally 
arranged on other surfaces of the device. 
At least one heating element is provided in at least one of the first leg 
and the second leg. In the preferred embodiment, separate heating elements 
are provided in both the first leg and the second leg. By providing a 
plurality of heating elements in both the second leg and the first leg, 
the hair is heated more effectively and evenly. 
In all, the present styling device provides the user with many different 
styling tools in one unit, with each providing, to varying degrees, a more 
natural looking curl than a conventional curling iron.

DETAILED DESCRIPTION OF THE INVENTION 
Referring to FIG. 1, a hair styling device, generally designated 10, is 
shown in an open position and includes an elongated, generally tubular 
first leg 12 and an elongated generally tubular second leg 14. The first 
leg 12 has a top surface 16, a handle end 17, a bottom surface 18 and a 
styling end 19. The second leg 14 has a top surface 20, a handle end 21, a 
bottom surface 22 and a styling end 23. In the preferred embodiment, the 
first and second legs 12, 14 are pivotally joined to each other at the 
respective handle ends, 17, 21, and are movable between the open position 
and the closed position (best seen in FIG. 3). 
On the top surface 20 of the second leg 14, a plurality of teeth 24, 26 are 
arranged at the styling end 23 to separate and brush the hair as it flows 
over the hair styling device 10. The first leg 12 has a plurality of teeth 
25, 27 and a plurality of ridges 28 on the first leg top surface 16. While 
the ridges 28 are preferably disposed on the first leg top surface 16, it 
is also contemplated that the ridges 28 could also be located on the 
second leg bottom surface 22, or on both surfaces 16, 22. It is also 
preferred that the ridges 28, and the top surface 16 are made of a heat 
conductive material, preferably metal. 
In the preferred embodiment, each of the ridges 28 has a length which spans 
the entire width of the top surface 16 at the styling end 19. Other 
lengths are contemplated depending on the application. Preferably, the 
ridges 28 extend radially outward from the first leg 12 by a height 
ranging from 0.145 inches to 0.185 inches. Also, in the preferred 
embodiment there are four ridges 28, each separated from the next by equal 
intervals. However, it is also contemplated that the number and spacing of 
the ridges 28 may vary to suit the application. Each of the ridges 28 has 
a gently rounded crown 29 to provide a braking force on strands of hair 
caught between the ridges 28 and the opposed leg surface without 
unnecessarily impeding the progress of the device 10 through the hair. 
Preferably located at generally equal intervals, the ridges 28 allow the 
stylist to selectively increase the residence time of hair at the styling 
ends 19, 23, at least one of which is heated. Increased heat usually 
results in the hair being more responsive to styling. While defining a 
space 52 between adjacent ridges 28, the ridges 28 act as brakes when the 
user squeezes the first leg 12 against the second leg 14. Since they are 
dimensioned to contact the second leg bottom surface 22 when the legs 12, 
14 are in the closed position, the ridges 28 press some of the strands of 
hair against the bottom surface 22 of the second leg 14. As the stylist 
moves the device 10 through the hair, grasping the legs 12, 14 together, 
the stylist can keep the hair taut. The combination of the ridges 28 and 
teeth 27 provide a more structured curl than a conventional curling brush, 
but also make a more natural looking curl than a conventional curling 
iron, thus combining the advantages of both devices, while eliminating 
many of their inherent problems. 
An important feature of the styling device 10 is the space 52 (best seen in 
FIG. 3) that is created between the first leg 12 and the second leg 14 
when the first and second legs 12, 14 are clasped together by the stylist, 
which keeps most of the hair generally flowing freely through the device 
10 as it pulls the hair through it, with the exception of the hair clamped 
by the ridges 28. Since at least one of the styling ends 19, 23 is heated, 
the hair is more gently manipulated than by conventional curling irons and 
brushes, thus creating a more natural looking curl. 
Referring again to FIG. 1, in one embodiment, the first leg 12 and the 
second leg 14 both respectively include a heat insulated plastic piece 30, 
32 on the end of the styling ends 19, 23. The end pieces 30, 32 allow the 
user to grasp the end of the styling device 10 during use. The handle ends 
17, 21 also do not conduct heat well, and are similar to handles found on 
conventional curling irons and brushes. These pieces allow the user to 
maintain better control over the device 10, therefore more effectively 
styling the hair. In conventional curling irons and brushes, the styling 
ends must be long with respect to the handle length to work effectively. 
As seen in FIG. 1, the length of the handle ends 17, 21 are roughly twice 
as long as the length of the styling ends 19, 23 of the first leg 12 and 
the second leg 14. This enhances the ability of the stylist to access and 
selectively style and manipulate certain portions of a subject's hair. 
Another feature of the device 10 is a latching mechanism 38. This mechanism 
38, preferably located on the handle end 21 of the second leg 14, includes 
an actuator button 38a and a lug 38b configured to interact with a 
counterpart receptacle 40 on the first leg handle end 17 (shown in FIG. 
2), to releasably lock the first leg 12 and the second leg 14 together. 
With the latching mechanism 38, 40 the user may easily lock the first and 
second legs 12, 14 together for ease of handling when the user is only 
using the top surface 20 of the second leg 14 or the bottom surface 18 of 
the first leg 12. It is also contemplated that the lug 38b and the 
receptacle 40 may be reversed in position on the respective legs 12, 14. 
Referring now to FIG. 2, the second leg 14 is pivotally connected to the 
first leg 12 at a pivot point 42. Although the second leg 14 and the first 
leg 12 are connected at the handle ends 17, 21 in the preferred 
embodiment, it is contemplated that they could be pivotally connected at 
other points along the first leg 12 and the second leg 14. In the 
preferred embodiment, the styling device 10 is biased in an open position 
by use of a coil spring 43 located at the pivot point 42. Thus, the user 
must overcome the biasing force of the spring 43 to place the legs 12, 14 
in the closed position. 
The styling device 10 includes at least one heating element 44 (FIG. 3), 
which is energized by electrical power in the preferred embodiment. The 
heating element 44 is connected to an electrical swivel cord 46. 
Preferably, there are two heating elements 44, one in each of the first 
leg 12 and the second leg 14. This increases the versatility of the device 
10 by providing the user or stylist with a plurality of styling surfaces. 
Also, multiple heating elements 44 heat the hair more effectively by 
surrounding the hair with heat. 
The heating element 44 is turned off and on by a switch 47 which may be 
included on either of the handle ends 17, 21. Also included as a part of 
the heating element 44 is a sliding temperature control gauge 48 that 
regulates the temperature of the styling device 10. By being able to 
change temperatures, the user controls the curl of the hair better than in 
a conventional curling iron that is only turned on and off. A hotter 
temperature provides more structure to the curl, whereas a lower 
temperature creates a looser curl or a wave. Preferably, the temperature 
control gauge 48 is included on the first leg handle end 17, although 
other placement is contemplated. 
Also shown in FIG. 2 are the teeth 24, 26 on the styling end 23 of the 
second leg 14. The teeth 24, 26 are arranged in a plurality of spaced rows 
50 that are generally parallel to a longitudinal axis A. The teeth 24, 26 
in each row 50 are arranged so that they are staggered axially from the 
teeth 24, 26 in the adjacent row 50. By providing staggered rows of teeth 
24, 26, the styling device 10 more effectively separates the hair and 
creates a more natural looking curl than a conventional curling iron. 
Referring now to FIGS. 3 and 4, the teeth 24, 26 of the second leg 14 are 
shown in the preferred format. A plurality of teeth 24 in one row 50a are 
taller than the teeth 26 in an adjacent row 50b. Preferably, the taller 
teeth 24 are made of plastic, while the shorter teeth 26 are made of 
metal. By utilizing metal in the shorter teeth 26, the styling device 10 
can conduct heat more effectively to the hair. However, the nonconductive 
plastic taller teeth 24 allow the user to wrap the styling device 10 
around the hair all the way up to the hair root, without worry of burning 
the scalp. This is important because the hair near the scalp, or the 
roots, cannot be easily curled with a conventional iron because of the 
risk of burning the scalp. In some conventional curling brushes, the teeth 
are made of plastic to combat this problem. However, this does not allow 
the heat to travel through the teeth to the hair, and less heat transfer 
reduces the curling and/or straightening power of the brush. Also 
contemplated are rows 50 of plastic teeth 25 that alternate with shorter 
metal rows 50 of teeth 27 on the styling end 19 of the first leg 12 (best 
seen in FIG. 4). 
Also shown in FIG. 4 is the arrangement of the teeth 25, 27 in the second 
preferred embodiment. In this embodiment, the shorter, metal teeth 27 
alternate with the taller plastic teeth 25 within the same row 50. This 
arrangement of teeth 25, 27 may be used on the first leg 12 as well as the 
second leg 14, and is done for the same reason as alternating the material 
of the teeth 25, 27 in the first embodiment. The range in height of the 
teeth 25, 27 can be the same for both embodiments. 
Although other dimensions are contemplated, the range of height for the 
shorter teeth 26 is preferably 0.140 inches to 0.210 inches. The height of 
the taller teeth 24 is preferably 0.230 inches to 0.270 inches. This is 
the same range for the taller teeth 25 on the first leg 12. Preferably, 
the height of the shorter teeth 27 range from 0.100 inches to 0.150 
inches. 
Referring again to FIG.3, it is preferable that at least the styling end 19 
of the first leg 12 has an oval cross section, defining an arc which is 
part of a circle with radius r1, and at least the styling end 23 of the 
second leg 14 has a crescent-shaped cross section and is configured so 
that in the closed position, at least the styling end 23 of the second leg 
14 nestably engages with the styling end 19 of the first leg 12. When the 
first leg 12 and second leg 14 are in the closed position, a generally 
circular cross section is created with a radius R, such that R is less 
than r1. 
Referring now again to FIG. 4, a cross section of the first leg 12 is 
shown. In the preferred embodiment, the teeth 27 are made of metal for 
maximum heat conduction, although as discussed earlier, teeth 25 made of 
plastic are also contemplated. The teeth 27 of the first leg 12 are 
separated by the ridges 28 that are arranged generally transversely to the 
longitudinal axis A, thus defining the space 52 (shown in FIG. 2). 
Referring now to FIG. 5, an alternate embodiment of the device 10 is 
designated 10a, wherein like features of the device 10 are provided with 
identical reference numbers. In the device 10a, the second leg 14 includes 
teeth 24a on the bottom surface 22 as well as teeth 24, 26 on the top 
surface 20. This provides more brushing control when hair is captured 
between the first leg 12 and the second leg 14. This embodiment also 
contemplates both short teeth 26 and taller teeth 24 as discussed above. 
Turning now to FIG. 7, the various types of curls created by the present 
styling device 10 will be described. Due to the different shapes of the 
first leg 12 and the second leg 14, an edge 58 of the first leg 12 has a 
different curvature from an edge 60 of the second leg 14. The edge 58 of 
the first leg 12 is relatively sharper, while the edge 60 of the second 
leg 14 is relatively more gently curved than the edge 58 of the first leg 
12. The different shaping allows the user to manipulate the styling device 
10 to create a variety of stylized looks. This advantage allows the user 
to create a range of hair styles with a single device that in the past may 
have required numerous conventional curling irons and/or curling brushes. 
Hair strand A, which represents a larger group of hair strands of the type 
manipulated by a stylist at a time, shows the curl in a first use of the 
styling device 10. The user positions the unlatched styling device 10 with 
the second leg 14 pointing towards the scalp 54. The hair strand A is 
placed between the first and second legs 12, 14, which are then gripped 
together in the closed position, to achieve the desired amount of braking. 
Taking the unlatched styling device 10 near the scalp 54, the user pulls 
the device 10 towards the tip 62 of the hair strand A and away from the 
scalp 54, rotating the styling device 10 in a clockwise direction towards 
the head 56. 
As the device is moved toward the tip 62, the hair strand A not engaged by 
the ridges 28, flows through the space 52 between the first leg 12 and the 
second leg 14. Best results are achieved if the user begins with the 
device 10 close to the scalp 54. During this operation of the styling 
device, the hair strand A is being continuously combed by the teeth 25, 27 
on the first leg 12 as it flows between the first and second legs 12, 14. 
This prevents clumping and unnatural crimping of the hair strand A, 
allowing it to be curled in a natural looking way. 
The rotating motion of the device 10 forces the hair strand A against the 
uppermost rounded edge 60 of the second leg 14, bending the hair strand A. 
As a result, a small, tight curl 64 that still looks natural and soft is 
created. Also, by rotating the styling device 10 clockwise, the hair 
strand A is curled under towards the head 56. 
The user may also further manipulate the type of curl created by clamping 
and releasing the first and second legs 12, 14. As discussed earlier, when 
the first and second legs 12, 14 are brought together, the ridges 28 act 
as brakes on the hair strand A, keeping the hair strand A taut as it flows 
through the space 52. This provides better control of the hair strand A 
and allows the user to further change the types of curl created. 
Hair strand B, the second strand of hair depicted in FIG. 7, depicts 
another type of curl that can be created by the styling device 10. To 
create the second look, the user places the hair strand B between the 
first leg 12 and the second leg 14, keeping the styling device 10 
unlatched. As in creating the first look, results are best if the user 
starts close to the scalp 54. In this method, however, the first leg 12 is 
located towards the head 56. The user manipulates the styling device 10 in 
much the same way as done in the first method, pulling the device down 
towards the tip 62 of the hair strand B, while rotating clockwise towards 
the head 56. On hair strand B, the device 10 is shown in "normal" (upper) 
and "rotated" (lower) orientations. Also, the user my further manipulate 
the curl, as done with hair strand A, by more fully closing the first and 
second legs 12, 14, causing the ridges 28 to act as brakes on the hair 
strand B. 
This time, however, a much different curl is created than before. The hair 
strand B is bent over the edge 58 of the first leg 12. Since the edge 58 
of the first leg 12 is relatively sharper in shape than the edge 60 of the 
second leg 14, the curl created is a looser, larger curl. As in the first 
method, the hair strand B is being continuously combed by the teeth 25, 27 
on the first leg 12 as it flows in the space 52 between the two legs 12, 
14, which helps keep the curl looking soft and natural. 
These two types of curls demonstrate the versatility of the present styling 
device 10. By merely changing which leg the hair bends against, a user may 
create curls of different sizes with a single appliance. 
The third hair strand depicted, hair strand C, demonstrates another 
advantage of the styling device 10. Here, instead of using the device 10 
to curl the hair, the user is using the device 10 to straighten curly 
hair. After latching the device 10 in a closed position, the user takes 
the hair strand C, near the scalp 54 and holds it taut with a free hand. 
While holding the hair taught, the user rotates the device 10 slightly 
clockwise and presses the edges 58, 60 of the first and second legs 12, 14 
against the hair strand C and rubs the edges 58, 60 along the length of 
the hair strand C. The edges 58, 60 acts like an iron, effectively 
straightening the formerly curly hair strand C and illustrating another 
advantage of the styling device 10. Another advantage is that unlike most 
styling devices which are made specifically to either straighten or curl 
the hair, the present device performs both operations. This feature is 
especially advantageous for a professional stylist who often needs to use 
straighteners and curlers on customers' hair. With the present device 10, 
the amount of required styling equipment is significantly reduced. 
Hair strand D illustrates another way for the user to straighten curly 
hair. The user takes the hair strand D, near the scalp and holds it taut 
with a free hand. While holding the hair taut, the user presses the bottom 
surface 18 of the first leg 12 against the hair strand D and rubs the 
bottom surface 18 along the length of the hair strand D. The smoothness of 
the bottom surface 18 acts like an iron, again effectively straightening 
the formerly curly hair D. This is another way for the user to straighten 
curly hair. 
Finally, hair strand E depicts another use of the styling device. As in the 
hair strand B, the user places the hair strand E between the unlatched 
first and second legs 12, 14, at a point near the scalp 54 with the first 
leg 12 located near the scalp 54. The user then pulls the styling device 
10 down over the length of the hair strand E, this time rotating the 
styling device 10 counterclockwise. By rotating the styling device 10 
counterclockwise, curls 66 are created that turn away from the head 56 in 
a flip style. While the styling device 10 is being rotated, the hair 
strand E is being bent over the rounded edge 60 of the second leg 14. As 
discussed earlier, the hair strand E may be further manipulated by closing 
the first leg 12 and the second leg 14, so that the ridges 28 act as 
brakes on the hair. 
As in the case of the hair strand A, the edge 60 of the second leg 14 is 
more rounded than the edge 58 of the first leg 12. This creates a tight, 
small curl in the direction away from the head 56. Also, as was the case 
with the unlatched styling device 10 with hair strands A and B, the hair 
strand E would be continuously combed by the teeth 25, 27 located on the 
top surface 16 of the first leg 12. This helps to separate the hair strand 
E and keep it flowing smoothly and naturally between the first leg 12 and 
the second leg 14. 
This latter method can be practiced with the positions of the first and 
second legs 12, 14 reversed, so that the second leg 14 is located near the 
scalp 54 (not shown). In that situation, the hair strand E would be forced 
against the edge 58 of the first leg 12, as was the case with the hair 
strand B. Like the hair strand B, looser, larger curls would be created by 
using this method, except this time, the curls would be turned away from 
the head 56. 
Consequently, the present invention provides a styling device that curls or 
straightens hair in a natural looking way by utilizing a first leg and a 
second leg. Both the first leg and the second leg have a top surface and a 
bottom surface, preferably with rows of teeth located between opposing 
surfaces of the first leg and the second leg. When pressed together in a 
closed position, the first and second legs are separated by a space which 
allows most of the hair to flow freely through the styling device. Ridges 
are also provided between the opposing surfaces to act as brakes on some 
of the hair to enhance the residence time of the hair in the heated 
styling end. The teeth on the top side of the second leg have the 
advantages of a conventional curling brush, e.g., the natural looking 
curl, separated hair, while the ridges provide more structure to the curl. 
By heating the first leg and the second leg with separate heating 
elements, maximum heat conduction to the hair is achieved. 
While various embodiments of the present heated hair styling device have 
been shown and described, it should be understood that other 
modifications, substitutions and alternatives are apparent to one of 
ordinary skill in the art. Such modifications, substitutions and 
alternatives can be made without departing from the spirit and scope of 
the invention, which should be determined from the appended claims.