Patent Publication Number: US-11382408-B2

Title: Hair brush structure

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The invention relates to improvements of a hair brush structure and more particularly to a hair brush utilizing a simple structure and a rotational or push-pull operation to quickly changing a diameter of a brush head and appearance thereof. 
     2. Description of Related Art 
     A conventional hair brush capable of adjusting a diameter of its brush head is shown in  FIGS. 14A and 14B . It mainly utilizes a plurality of cams of different diameters arranged in different relative positions so that the brush head has different appearances (e.g., conic appearance or spherical appearance) by having different combinations of the cams. However, for changing the appearance of the brush head, it is required to detach the brush head, remove the cams from the brush head, change the positions of combinations of the cams, and assemble these components again. Its operation is very inconvenient. 
     Thus, the need for improvement still exists. 
     SUMMARY OF THE INVENTION 
     It is one object of the invention to provide an improvement of hair brush structure and more particularly to a hair brush utilizing a simple combination of component to quick change a diameter of a brush head and appearance thereof. 
     According to an embodiment of the present invention, wherein the hollow cylinder of the internal locking device includes an flat connection member at one end, and a positioning cavity at one end of each guide groove adjacent to the flat connection member; and wherein the rotation of the adjustment device causes the guide rods to enter the positioning cavities, thereby locking the guide rods in the positioning cavities with movement being not allowed. 
     According to an embodiment of the present invention, wherein the internal locking device and the support shaft are fitted together, the internal locking device and the support shaft are inserted into the adjustment device, the brush head includes a bending body having a plurality of holes at one end, and the internal locking device includes an outward extending flat connection member at one end of the hollow cylinder and a plurality of corresponding projections adapted to complimentarily fasten in the holes so as to fasten the brush head. 
     According to an embodiment of the present invention, wherein the adjustment device includes the inner channel having the threads, an outer member having a bottom formed with one end of the outer member, and an annular gap between open other ends of the inner channel and the outer member so that the projections are adapted to pass through the holes into the annular gap to fasten a bottom of the brush head in the annular gap. 
     According to an embodiment of the present invention, wherein the other end of the internal locking device is disposed in a receptacle of the handle so that the adjustment device is disposed between the brush head and the handle. 
     Another aspect of the present invention is a hair brush structure, comprising: a brush head; a handle; and an adjustment device interconnected to the brush head and the handle; wherein the brush head has one end attached to an internal locking device, the internal locking device is disposed in the adjustment device and includes a hollow cylinder with a support shaft disposed therein, the support shaft is inserted into the brush head and secured to a top of the brush head, the internal locking device and the support shaft are fitted together, the internal locking device further comprises an outward extending flat connection member at one end of the hollow cylinder, the flat cylinder, the central hole having two opposite recesses and two opposite extending grooves adjacent to the recesses respectively, the support shaft includes two guide rods corresponding to the recesses respectively, and in response to moving the adjustment device by moving the internal locking device and by utilizing the flat connection member, the guide rods of the support shaft pass through the recesses of the central hole to enter the extending grooves, thereby changing an appearance of the hair brush. 
     According to an embodiment of the present invention, further comprising a positioning cavity at one end of each extending groove wherein in response to moving the internal locking device by rotating the adjustment device, the guide rods enter the positioning cavities communicating with the extending grooves, thereby locking the guide rods in the positioning cavities with movement being not allowed. 
     According to an embodiment of the present invention, wherein the internal locking device is disposed in the adjustment device, the brush head includes a bending body having a plurality of holes at one end, and the flat connection member further comprises a plurality of corresponding projections adapted to complimentarily insert through the holes of the brush head, thereby fastening the brush head. 
     According to an embodiment of the present invention, wherein the adjustment device includes an inner channel, an outer member having a bottom formed with one end of the outer member, and an annular gap between open ends of the inner channel and the outer member so that the projections are adapted to pass through the holes into the annular gap to fasten a bottom of the brush head in the annular gap. 
     According to an embodiment of the present invention, wherein the support shaft further comprises an enlarged lower member fastened in a receptacle of the handle. 
     According to an embodiment of the present invention, wherein the brush head further comprises a through hole at the other end, further comprising a rod-shaped fastener adapted to pass through the through hole of the brush head to insert into one end of the support shaft, thereby securing the top of the brush head to the end of the support shaft. 
     The invention has the following advantageous effects: It utilizes the adjustment member to change an appearance of the hair brush structure from sphere to oval or vice versa. Thus, the user may have one of many different styles on the hair. 
     The above and other objects, features and advantages of the invention will become apparent from the following detailed description taken with the accompanying drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view of a hair brush according to a first preferred embodiment of the invention; 
         FIG. 2  is an exploded view of the hair brush; 
         FIG. 3  is another exploded view of the hair brush; 
         FIG. 4  is a longitudinal sectional view of the hair brush; 
         FIG. 4A  is a longitudinal sectional view of the adjustment member of the hair brush; 
         FIG. 5A  schematically depicts a unlocked state of the hair brush; 
         FIG. 5B  is a sectional view of  FIG. 5A ; 
         FIG. 6A  schematically depicts a locked state of the hair brush; 
         FIG. 6B  is a sectional view of  FIG. 6A ; 
         FIG. 7  schematically depicts an operation of the hair brush; 
         FIG. 8  is another perspective view of the hair brush showing the different appearance; 
         FIG. 9  is a perspective view of a hair brush according to a second preferred embodiment of the invention; 
         FIG. 10  is an exploded view of the hair brush of the second embodiment; 
         FIG. 10A  is a longitudinal sectional view of the internal locking member of hair brush of the second embodiment; 
         FIG. 11  is a longitudinal sectional view of the hair brush of the second embodiment; 
         FIG. 12  schematically depicts an operation of the hair brush of the second embodiment; 
         FIG. 13  is a longitudinal sectional view of  FIG. 12 ; 
         FIG. 14A  is an exploded view of a conventional hair brush; and 
         FIG. 14B  is a longitudinal sectional view of the conventional hair brush. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Referring to  FIGS. 1 to 8 , a hair brush  1  in accordance with a first embodiment of the invention comprises a brush head  10 , a handle  20 , and an adjustment device  30  interconnected to the brush head  10  and the handle  20  as discussed in detail below. 
     As shown in  FIGS. 2 and 3 , the brush head  10  includes a bending body having a plurality of holes  11  at one end for attaching to an internal locking device  40 . The internal locking device  40  includes a hollow cylinder  401 , an outward extending flat connection member  41  at one end of the hollow cylinder  401  and a central hole  410  communicating with inside of the hollow cylinder  401 . When the brush head  10  is bent, a plurality of corresponding projections  411  adapted to complimentarily fasten in the holes  11  and a bottom of the brush head  10  is secured to the internal locking device  40 . 
     The internal locking device  40  further comprise two opposite guide grooves  42  on the hollow cylinder  401 , and a positioning cavity  421  at one end of the guide groove  42  adjacent to the flat connection member  41 . The guide groove  42  and the positioning cavity  421  contact together are shaped as an “L” (see  FIGS. 5B and 6B ). 
     The hair brush  1  further comprises a support shaft  50  including two opposite guide rods  51  proximate at one end, the guide rods  51  being moveably disposed in the guide grooves  42  of the internal locking device  40  so as one end of the support shaft  50  can be inserted into the hollow cylinder  401  by moving the guide rods  51  along the guide grooves  42 . Thus the other end of the support shaft  50  can be disposed in the brush head  10  by passing through the central hole  410 . After the brush head  10  has been bent, the brush head  10  has a through hole  12  at the top end, and a rod-shaped fastener  60  can pass through the through hole  12  to insert into the top end of the support shaft  50 . Thus, the top of the brush head  10  and the top end of the support shaft  50  are fastened together. 
     One end of the internal locking device  40  is connected to the brush head  10  and is fitted together with the support shaft  50 . Thereafter, the internal locking device  40  and the support shaft  50  are inserted into the adjustment device  30 . As shown in  FIG. 4 , the other end of the internal locking device  40  is disposed in a receptacle  21  of the handle  20 , and the adjustment device  30  is mounted between the brush head  10  and the handle  20 . 
     As shown in  FIG. 4A , the adjustment device  30  includes an inner channel  31  having threads  311 , and an outer member  32 . The bottom end of the inner channel  31  formed with one end of the outer member  32 . The other end of the outer member  32  is communicated to external and the inner channel  31  is surrounded by the outer member  32 . As shown in  FIG. 2 , the adjustment device  30  includes an annular gap  301  between the top ends of the inner channel  31  and the outer member  32 , to enable the projections  411  of the flat connection member  41  of the internal locking device  40  pass through the holes  11  to fasten in the annular gap  301  of the adjustment device  30 , as shown in  FIG. 4 . At the same time, the bottom of the bent brush head  10  is fastened in the annular gap  301  and the internal locking device  40  is fastened in the adjustment device  30 . 
     In assembly, the guide rods  51  of the support shaft  50  nested into the guide grooves  42  of the hollow cylinder  401  to dispose the support shaft  50  in the internal locking device  40 . As shown in  FIGS. 5A and 5B  in conjunction with  FIGS. 6 and 6B , in use for keeping the hair brush  1  as the structure of  FIG. 4 , the adjustment device  30  can be rotated to turn the threads  311  of the inner channel  31  to guide the guide rods  51  move to enter into the positioning cavities  421  at the ends of the guide grooves  42 . The guide rods  51  are locked in the positioning cavities  421  with movement not allowed. As a result, the brush head  10  can be kept for use as the oval shape of  FIG. 4 . 
     Moreover, the hair brush  1  may be shaped as the sphere structure for use of  FIG. 7 . In detail, the adjustment device  30  is rotated repeatedly to cause the threads  311  of the inner channel  31  to move the guide rods  51 . Thus, a use state of the hair brush  1  is changed by moving the guide rods  51  along the guide grooves  42  and the threads  311  in desired direction. If the adjustment device  30  is rotated counterclockwise, as shown in  FIG. 7 , the guide rods  51  move downwardly. And in turn, the support shaft  50  moves to a blind bottom of the receptacle  21  relative to the hollow cylinder  401 . 
     The rod-shaped fastener  60  is used to fasten the brush head  10  and the support shaft  50  together. When a downward movement of the support shaft  50 , the top of the brush head  10  also move downwardly. As the bottom of the brush head  10  is secured to the adjustment device  30 , the downward movement of the support shaft  50  presses the brush head  10 , and the shape of the brush head  10  is changed as a sphere for use (see  FIG. 8 ). 
     In addition, regarding, a rotation of the adjustment device  30  may move the guide rods  51  to the guide grooves  42 . To rotate the adjustment device  30  in an opposite direction to change the brush head  10  of the hair brush  1  from the sphere state as shown in  FIG. 7  to the original states as  FIGS. 1 and 4 . As one end, the user may use the hair brush  1  to curl the hair into one of many different styles. 
     Referring to  FIGS. 9 to 13 , a hair brush  1 A in accordance with a second preferred embodiment of the invention is shown. The same components are labeled with the same reference characters and its description is omitted herein for the sake of brevity. 
     The characteristics of the second embodiment are substantially the same as that of the first preferred embodiment except the following: the hair brush  1 A includes an adjustment device  30 A which is interconnected to the brush head  10  and the handle  20 . The adjustment device  30 A includes an outer member  32  and an inner channel  31 A which does not have internal threads  311  of the first embodiment. 
     The bottom of the brush head  10  is secured to an internal locking device  40 A of the hair brush  1 A. The internal locking device  40 A has a hollow cylinder  401 A, an flat connection member  41  at one end of the hollow cylinder  401 A and having a central hole  410  communicating with inside of the hollow cylinder  401 A, the central hole  410  having two opposite recesses  412 A. As shown in  FIG. 10A , under the flat connection member  41 , the hollow cylinder  401 A includes two opposite extending grooves  43 A directly below the corresponding recesses  412 A respectively. One end of the extending groove  43 A is provided with a positioning cavity  431 A. 
     A support shaft  50 A of the hair brush  1 A includes an enlarged lower member  52 A fastened in the receptacle  21  of the handle  20 . Two opposite guide rods  53 A are formed on an upper portion of the support shaft  50 A above the enlarged lower member  52 A. The guide rods  53 A of the support shaft  50 A correspond to the opposite recesses  412 A of the central hole  410  respectively so that the guide rods  53 A of the support shaft  50 A may pass through the opposite recesses  412 A. 
     The hair brush  1 A of the second embodiment may be in an oval use state of  FIG. 11  or a sphere use state of  FIGS. 12 and 13 . As shown in  FIG. 13 , the adjustment device  30 A is secured onto the internal locking device  40 A. Thus, an upward movement of the adjustment device  30 A may also move the internal locking device  40 A upward. As shown in  FIG. 13 , by utilizing the flat connection member  41 , the guide rods  53 A of the support shaft  50 A may pass through the opposite recesses  412 A of the central hole  410  of the flat connection member  41  to enter the lower extending grooves  43 A. 
     In use, for keeping the hair brush  1 A in the structure of  FIG. 13 , the adjustment device  30 A can be rotated to move the internal locking device  40 A so that the lower member  52 A can be locked by the positioning cavities  431 A communicating with the extending groove  43 A. Thus, the guide rods  53 A are not allowed to move upward or downward. As a result, the brush head  10  can be kept as the spherical shape of  FIG. 12  for use. 
     Moreover, regarding the hair brush  1 A, a rotation of the adjustment device  30 A may move the guide rods  53 A into the extending grooves  43 A. A reverse downward movement of the adjustment device  30 A returns the brush head  10  from the sphere state of  FIG. 12  to the oval state of  FIG. 9 . 
     While the invention has been described in terms of preferred embodiments, those skilled in the art will recognize that the invention can be practiced with modifications within the spirit and scope of the appended claims.