referring to fig1 , there is disclosed an embodiment of device 100 according to the present invention . the device is useful in preventing and correcting pseudofolliculitis barbae , pseudofolliculitis pubis , and pseudofolliculitis nuchae by extricating ingrown hair from the hair follicle and dislodging imbedded hair from the underneath of the epidermal layer of the skin . the invention comprises a rasp , an insert , a handle , and a cap . fig1 shows a perspective view of a preferred embodiment of the device in a closed position wherein only the handle 30 and the cap 40 are observed ; the rasp 10 and insert 20 is enclosed by the cap 40 . while fig2 shows the device in an open ( working ) position where the bottom of the insert 20 is fused into the handle 30 ; the rasp 10 is mounted onto the insert 20 , and the cap 40 is taken off from the rasp / insert 10 / 20 . an exploded view of the preferred embodiment of the device was disclosed in fig3 where the cap 40 is taken off from the insert 20 and rasp 10 ; the insert 20 is not fused into the handle 30 and the rasp 10 is removed from the insert 20 . referring to fig4 , there is disclosed a preferred embodiment of the rasp 10 according to the present invention . the rasp 10 is the primary component of the present invention . the rasp 10 extricates ingrown hair from hair follicles ; dislodges imbedded hair from underneath the epidermal layer of the skin . the rasp 10 also prevents extrafollicular and transfollicular penetration . it accomplishes this by dislodging and displacing hair away from the hair follicle and uncurling the hair to prevent the hair from imbedding itself underneath the epidermal layer of the skin . the rasp 10 is ergonomically designed to match the curvature of the hairy regions of human face , neck , and pelvic region . fig4 a and 4b illustrate the front view and the side view of the rasp , respectively . in general , the rasp is a piece of a curved elongated metal sheet having a concave outer surface 11 and an inner surface 12 as well as a top edge 13 , a bottom edge 14 , a first side edge 15 and a second side edge 16 . rasp has a plurality of protrusions 17 on the concave outer surface . along each of the two side edges on the inner surface , the rasp has a projection 18 to be snapped onto the insert 20 . it can be removed for cleaning and sanitizing . the protrusions 17 are evenly distributed over the entire rasp 10 except the four border region 19 along the four edges . in addition to the semi - circle shape , the rasp 10 may be of other different shapes . besides having only one curvature , the rasp 10 may have two different curvatures on the metal sheet . fig4 a , fig4 c , and fig4 d disclose the preferred embodiment with detailed dimensions . fig4 a shows the front view of the rasp , fig4 c shows a top view of the rasp ; and fig4 d shows an expanded view of a partial rasp of fig4 a . the preferred embodiment of the rasp is a piece of elongated curved metal sheet having 2 inches in height , 0 . 442 inch in width , 0 . 236 inch in radius , and 0 . 006 inch in thickness ; the border region is within about 0 . 16 inch of each edge ; all the protrusions 17 are of the same size with a diameter of 0 . 025 inch ; the projection 18 rectangular prism is 0 . 083 × 0 . 083 × 2 inches in width , length and height . the rasp including all components may vary in size , and curvature . the rasp 10 is made of stainless steel or another hard and moldable non - ferrous metal that can be fabricated into a rasp 10 . the protrusion 17 may be of different shapes and dimensions . referring to fig5 , there is disclosed an embodiment of the insert 20 according to the present invention . the insert 20 has a bottom member 21 , which is fused into the top of the handle 30 , and a body member 22 , which has a dimension adapted to match the rasp 10 in order to provide the base and platform on which the rasp 10 is mounted . the insert 20 is made of injection molded plastic . the handle 30 disclosed in fig6 is ergonomically designed to fit the human hand . the handle 30 has two sides ; the round side 31 being on the same side of the concave surface 11 of the rasp 10 , the flat side 32 being opposite to the concave surface 11 of the rasp 10 . the round side 31 and the flat side 32 connect with each other along the longitudinal edges 33 to form a hollow half round d - shaped elongated member . the top 34 of the handle 30 is open for receiving the bottom 21 of the insert 20 . the bottom 21 of the insert 20 is fused into the top 34 of the handle 30 . the bottom 35 of the handle 30 is closed . the d - shaped configuration of the handle 30 facilitates the user by providing grip and control of the device . in the preferred embodiment , the height of the handle 30 is about 3 . 375 inch . the largest width of the cross section of the top opening 34 is about 0 . 491 inch . the angle between the round side 31 and the flat side 32 is approximately 89 . 5 degrees . the thickness of the handle 30 is about 0 . 031 inch . around the lower end , the handle 30 gradually forms a dome at the bottom tip 35 . the handle 30 may vary in size and curvature . the handle 30 can be made of injection molded plastic . besides a d - shape configuration , the handle 30 may be of other shapes . referring to fig7 a and 7 b , there is disclosed a preferred embodiment of the cap 40 according to the present invention . the cap 40 is made of injection molded plastic and is used to cover the rasp and the insert of the device . the cap 40 has two sides ; the round side 41 being on the same side of the concave surface 11 of the rasp 10 , the flat side 42 being opposite to the concave surface 11 of the rasp 10 . the round side 41 and the flat side 42 connect with each other along the longitudinal edges 43 to form a hollow half round d - shaped elongated member . the bottom entrance 44 of the cap 40 is open for receiving the rasp 10 and insert 20 . the top 45 of the cap 40 is closed . the d - shaped configuration of the top 40 is to conform and complement the symmetry of the handle 30 . the cap has a clip 46 on the flat side 42 which adds a visual aesthetic and facilitates in ease of transport and access to the instrument . the clip 46 may contain a magnet or be made of a magnetic material so that it can be attached to a metal piece for easy storage or access . the clip 46 may be used to hang on a pocket for easy access . in the preferred embodiment , the height of the cap 40 is about 2 . 500 inch ; the largest width is about 0 . 494 inch ; the thickness is about 0 . 031 inch . the length of clip 46 is about 1 . 600 inch . the cap 40 gradually slopped upwards and inwards and close at the top . the cap 40 may vary in size and curvature . the cap 40 can be made of injection molded plastic . in addition to the d - shape configuration , the cap 40 may be of other shapes . while there have been shown and described and pointed out the fundamental novel features of the invention as applied to the preferred embodiments , it will be understood that the foregoing is considered as illustrative only of the principles of the invention and not intended to be exhaustive or to limit the invention to the precise forms disclosed . obvious modifications or variations are possible in light of the above teachings . the embodiments discussed were chosen and described to provide the best illustration of the principles of the invention and its practical application to enable one of ordinary skill in the art to utilize the invention in various embodiments and with various modifications as are suited to the particular use contemplated all such modifications and variations are within the scope of the invention as determined by the appended claims when interpreted in accordance with the breadth to which they are entitled .
the present invention discloses a device for physically dislodging , extricating , and manipulating ingrown body and facial hair so as to prevent and correct pseudofolliculitis barbae , pseudofolliculitis pubis , and pseudofolliculitis nuchae . the device comprises a rasp , an insert , a handle , and a cap . the rasp is the primary component of the device . the rasp extricates ingrown hair from hair follicles ; dislodges imbedded hair from underneath the epidermal layer of the skin thereby allowing the hair to fully emerge from the follicle . the rasp also prevents extrafollicular and transfollicular penetration of the follicle wall .