Patent Publication Number: US-2012038192-A1

Title: Car seat head rest with built-in screen

Description:
CROSS REFERENCE OF RELATED APPLICATION 
     This is a Divisional application that claims the benefit of priority under 35U.S.C. §119 to a non-provisional application, application Ser. No. 12/288,952, filed Oct. 24, 2008, which is a Continuation-In-Part application of a non-provisional application, application Ser. No. 11/591,197 and a filing date of Oct. 31, 2006. 
    
    
     BACKGROUND OF THE PRESENT INVENTION 
     1. Field of Invention 
     The present invention relates to car seat head rest, and more particularly to a car seat head rest with built-in screen which is adapted for fitting into any type of car seat to provide an added entertainment system for the car. 
     2. Description of Related Arts 
     Every car nowadays has a car seat head rest installed on its car seat. A conventional head rest for car seat comprises a head pillow and two parallel supporting rods downwardly extended from the head pillow to slidably engage with two retention slots of the car seat. Accordingly, as different car models have different sizes of car seat, a specific dimensioned head rest might be tailor-made for the specific car seat. In other words, the distance between the two supporting rods of the head rest must match with a distance between the two retention slots of the car seat. Therefore, the driver cannot selectively switch the head rest from one car to another car. 
     In addition, most cars are modified to build a LCD screen at the rear side of the head rest for entertainment. However, the LCD screen must be incorporated with the original manufactured head rest. Since the original manufactured head rest is mainly made for supporting the head of the driver, the LCD screen does not provide any rigid frame structure to support LCD screen. In other words, such head rest which has the LCD screen often has problem with the LCD screen damaging from vibration and external shocks as the vehicle experience obstacles along the road. It is because the supporting frame which holds the LCD screen provides a lot of freedom for the LCD screen to move around inside the head rest and thus damaging the electronic components of the LCD screen. 
     SUMMARY OF THE PRESENT INVENTION 
     A main object of the present invention is to provide a car seat head rest with built-in screen which allows the head rest to be installed in any type of car seat. 
     Another object of the present invention is to provide a car seat head rest with built-in screen, wherein two parallel supporting arms are adjustable with a distance therebetween to match with two retention slots of the car seat, such that the car seat head rest is adapted to be self-adjusted to fittedly incorporating with any size or type of car seat. 
     Another object of the present invention is to provide a car seat head rest which the mounting mechanism is highly resistant to vibration and external impacts thus ensuring the head rest can be firmly mounted onto the car seat. 
     Another object of the present invention is to provide a car seat head rest with built-in screen to provide entertainment to passengers without alternating the original structure of the car seat. 
     Another object of the present invention is to provide a car seat head rest with built-in screen which is stably installed within the head rest to protect its electronic components from vibration and external impacts. 
     Another object of the present invention is to provide a car seat head rest, wherein two sliding panels are coupled with the supporting arms to enhance the support of the supporting frame so as to substantially and securely retain the display screen in position. 
     Another object of the present invention is to provide a car seat head rest, wherein the sliding panels even distribute the applying force to the head pillow so as to extend the life-span of the car seat head rest. 
     Another object of the present invention is to provide a car seat head rest, wherein the supporting arms are moving in a synchronized manner via the sliding panels so as to provide a smooth and stabilize way to adjust the distance between two sliding arms. 
     Accordingly, in order to accomplish the above objects, the present invention provides an adjustable car seat head rest adapted for mounting on a car seat having two spaced apart retention slots, comprising a head pillow having a rear side, a bottom side and an interior cavity, a display screen supported at the rear side of the head pillow, and an adjustable mounting arrangement. 
     The adjustable mounting arrangement comprises: 
     a length-adjustable sliding guider longitudinally supported within the interior cavity of the head pillow; 
     a supporting frame, which is coupled with the sliding guider, comprising two overlapped sliding panels supported in the interior cavity of the head pillow in a slidably movable manner and two supporting arms downwardly and parallelly extended from the sliding panels respectively through the bottom side of the head pillow to define an engaging distance between the two supporting arms; and 
     an adjuster provided at the sliding guider to control a length of the sliding guider so as to selectively adjust the engaging distance of the supporting arms, wherein when the engaging distance of the supporting arms is adjusted corresponding to a distance between the two retention slots of the car seat, the two supporting arms are adapted for slidably engaging with the two retention slots respectively so as to securely support the head pillow on the car seat. 
     These and other objectives, features, and advantages of the present invention will become apparent from the following detailed description, the accompanying drawings, and the appended claims. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is an exploded perspective view of a car seat head rest for mounting on a car seat with the display screen according to a preferred embodiment of the present invention. 
         FIG. 2  is an exploded perspective view of the car seat head rest according to the preferred embodiment of the present invention. 
         FIG. 3  is a perspective view of the adjustable mounting arrangement illustrating a rotation of the manual tuner that minimizes the engaging distance according to the preferred embodiment of the present invention. 
         FIG. 4  is a perspective view of the adjustable mounting arrangement illustrating a rotation of the manual tuner that maximizes the engaging distance according to the preferred embodiment of the present invention. 
         FIG. 5  is a perspective view of the control sleeves illustrating the two inner thread portions. 
         FIG. 6  is a perspective view of the U-shaped reinforcing brackets. 
         FIG. 7  is a perspective view of the supporting frame and the base housing illustrating the mounting arrangement of the reinforcing brackets. 
         FIG. 8  is a perspective view of the car seat head illustrating the mounting arrangement onto the car seat. 
         FIG. 9  is an exploded perspective view of a car seat head rest for mounting on a car seat with the display screen according to a second preferred embodiment of the present invention. 
         FIG. 10  is sectional view of the car seat head rest according to the second preferred embodiment of the present invention. 
         FIG. 11  is a perspective view of the sliding enhancing unit according to the second preferred embodiment of the present invention. 
         FIG. 12  is an exploded perspective view of a car seat head rest for mounting on a car seat with the display screen according to a third preferred embodiment of the present invention. 
         FIG. 13  is a perspective view of the car seat head rest according to the above third preferred embodiment of the present invention. 
         FIG. 14  is a perspective view of the angle hinge according to the above third preferred embodiment of the present invention 
         FIG. 15  is a side view of the angle hinge according to the above third preferred embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     According to the preferred embodiment of the present invention as shown in  FIGS. 1 and 8  of the drawings, a car seat head rest for mounting on a car seat having two spaced apart retention slot  2  comprises a head pillow  5  having a rear side, a bottom side, and an interior cavity. The car seat headrest further comprises an adjustable mounting arrangement having a length-adjustable sliding guider  3  longitudinally supported within the interior cavity of the head pillow  5  as shown in  FIGS. 3 and 4  of the drawings and two supporting arms  31 ,  32  downwardly and parallelly extended from the sliding guider  3  respectively through the bottom side of the head pillow  5  to define an engaging distance between the two supporting arms  31 ,  32 . The two supporting arms  31 ,  32  are usually made of stainless steel so that they are strong; highly corrosion resisted, and can withstand any shocks and vibration from the moving vehicles when they are mounted on the car seat through the retention slots  2 . 
     According to  FIG. 2  of the drawings, the car seat head rest further comprises an adjuster  12  provided at the sliding guider  3  to control a length of the sliding guider  3  so as to selectively adjust the engaging distance of the supporting arms  31 ,  32 . When the engaging distance of the supporting arms  31 ,  32  is adjusted corresponding to a distance between the two retention slots  2  of the car seat, the two supporting arms  31 ,  32  are adapted for slidably engaging with the two retention slots  2  of the car seat respectively so as to securely support the head pillow  5  on the car seat. The supporting arms  31 ,  32  further has a plurality of slot  33  installed along thereon to couple with the two retention slot  2   s    2  such that the height of the car seat head rest can be adjusted. 
     The car seat head further comprises a display screen  34  built-in at the rear side of the head pillow  5 . The adjustable mounting arrangement further comprises a supporting frame  4  upwardly extended from the sliding guider  3  within the interior cavity of the head pillow  5  to support the display screen  34  at the rear side of the head pillow  5  so as to substantially retain the display screen  34  in position. The display screen  34  provides entertainment to the passengers behind the car seat head rest such as playing a DVD movie or TV. 
     The two supporting arms  31 ,  32  are two hollow arms respectively that a communication cable of the display screen  34  is extended through one of the supporting arms  31 ,  32  so as to protectively conceal the communication cable within the respective supporting arm  31 ,  32 . Therefore, the communication cable can provide signals and power required for the display screen  34  and is hidden inside the two supporting arms  31 ,  32  so as to keep an aesthetic appearance. 
     According to  FIG. 2-5  of the drawings, the adjuster  12  further comprises a control sleeve  10 ,  11  having two side opening ends  16 ,  17 . The sliding guider  3  comprises two sliding shafts  18 ,  19  engaging with the control sleeve  10 ,  11  at a position that inner ends of the sliding shafts  18 ,  19  are coaxially and slidably engaging with the side opening ends  16 ,  17  of the control sleeve respectively. While outer ends of the sliding shafts  18 ,  19  are securely attached to the supporting arms  31 ,  32  in such a manner that when the inner ends of the two sliding shafts  18 ,  19  are coaxially slid within side opening ends  16 ,  17  of the control sleeve  10 ,  11  respectively in a synchronized manner, the supporting arms  31 ,  32  are correspondingly moved to control the engaging distance between the two supporting arms  31 ,  32 . 
     The control sleeve  10 ,  11  has two inner thread portions  23 ,  24  provided at the two opening ends  16 ,  17  respectively. Each of the sliding shafts  18 ,  19  has an outer threaded  30   a ,  30   b  portion slidably engaging with the corresponding inner thread portion  23 ,  24  of the control sleeve  10 ,  11 . When the control sleeve  10 ,  11  is driven to rotate, the sliding shafts  18 ,  19  are slid correspondingly to control the engaging distance between the two supporting arms  31 ,  32 . 
     The two inner thread portions  23 ,  24  of the control sleeve  10 ,  11  are extended in opposite spiral direction such that when the control sleeve  10 ,  11  is rotated at a clockwise direction, the sliding shafts  18 ,  19  are synchronically slid towards each other to minimize the engaging distance between the two supporting arms  31 ,  32 . When the control sleeve  10 ,  11  is rotated at a counter clockwise direction, the sliding shafts  18 ,  19  are synchronically slid away from each other to maximize the engaging distance between the two supporting arms  31 ,  32 . 
     The adjuster  12  further comprises a manual turner  13 , which is coaxially mounted to the control sleeve  10 ,  11 , having a manipulating portion extending out of the interior cavity of the head pillow  5  through the bottom side thereof to drive the control sleeve  10 ,  11  to rotate. A manipulating tool is used to rotate the manual tuner  13  to turn the adjuster  12  such that the control sleeve  10 ,  11  can be rotated in the clockwise or counter clockwise depending on which way the adjuster is rotated so as to adjust the engaging distance between the two supporting arms  31 ,  32 .  FIG. 3  displays the rotation of the adjuster  12  to minimize the engaging distance between the two supporting arms  31 ,  32 .  FIG. 4  displays the rotation of the adjuster  12  to maximize the engaging distance between the two supporting arms  31 ,  32 . 
     The supporting frame  4  comprises a supporting panel supported within the interior cavity of the head pillow  5  to rigidly support the display screen  34  and a base housing  26  pivotally coupling with the sliding guider  3  in such a manner that the head pillow  5  is pivotally moved for adjusting a head-supporting angle of the head pillow  5  with respect to the car seat when the supporting arms  31 ,  32  are slidably inserted into the retention slots  2  of the car seat respectively. 
     According to  FIGS. 2 and 6  of the drawings of the preferred embodiment, the base housing  26  further comprises two U-shaped reinforcing brackets  21 ,  22 . Each of the U-shaped reinforcing brackets  21 ,  22  has a reinforcing slot  27 , mounted at two sidewalls of the head pillow  5  respectively at a position that the two supporting arms  31 ,  32  are extended from the sliding guider  3  through the reinforcing slots  27  of the reinforcing brackets  21 ,  22  respectively. The reinforcing brackets  21 ,  22  not only reinforce the head pillow  5  but also limit the head-supporting angle of the head pillow  5  by a width of each of the reinforcing slots  27 . The reinforcing brackets  21 ,  22  are firmly mounted onto the base housing  26  through a plurality of reinforcing hole  20   a ,  20   b ,  25   a ,  25   b  by use of simple bolts and screws. 
     The car seat head set comprising a bottom enclosing cover  28  mounted at the bottom side of the head pillow  5  to enclose the interior cavity thereof. The enclosing cover has a tuner opening  29  for the manipulating portion of the manual turner  13  protruding therefrom such that the manual turner  13  can be easily rotated by the user. The enclosing cover  28  further has two elongated arm openings  35 ,  36  for the supporting arms  31 ,  32  extending out of the bottom side of the head pillow  5  through the arm opening  35 ,  36  respectively. The enclosing cover  28  provides a better protection for the display screen  34  and the adjustable mounting arrangement against dirt and impact. 
     Referring to  FIG. 9 , car seat head rest of a second embodiment illustrates an alternative mode of the first embodiment of the present invention, wherein the car seat head rest comprises a head pillow  10 ′ having a rear side  11 ′, a bottom side  12 ′ and an interior cavity  13 ′, and a display screen  20 ′ supported at the rear side  11 ′ of the head pillow  10 ′. 
     The car seat head rest further comprises an adjustable mounting arrangement which comprises a length-adjustable sliding guider  30 ′ longitudinally supported within the interior cavity  13 ′ of the head pillow  10 ′, a supporting frame  40 ′ coupled with the sliding guider  30 ′, and an adjuster  50 ′ provided at the sliding guider  30 ′. 
     The supporting frame  40 ′ comprises two overlapped sliding panels  41 ′,  42 ′ supported in the interior cavity  13 ′ of the head pillow  10 ′ in a slidably movable manner and two supporting arms  43 ′,  44 ′ downwardly and parallelly extended from the sliding panels  41 ′,  42 ′ respectively through the bottom side  12 ′ of the head pillow  10 ′ to define an engaging distance between the two supporting arms  43 ′,  44 ′. 
     The adjuster  50 ′ is provided at the sliding guider  30 ′ to control a length of the sliding guider  30 ′ so as to selectively adjust the engaging distance of the supporting arms  43 ′,  44 ′, wherein when the engaging distance of the supporting arms  43 ′,  44 ′ is adjusted corresponding to a distance between the two retention slots  2  of the car seat, the two supporting arms  43 ′,  44 ′ are adapted for slidably engaging with the two retention slots  2  respectively so as to securely support the head pillow  10 ′ on the car seat. 
     According to the preferred embodiment, the sliding guider  30 ′ comprises a control sleeve  31 ′ having two side opening ends  310 ′ and two sliding shafts  32 ′ slidably engaging with the control sleeve  310 ′ at a position that inner ends of the sliding shafts  32 ′ are coaxially and slidably engaging with the side opening ends  310 ′ of the control sleeve  31 ′ respectively while outer ends of the sliding shafts  32 ′ are coupled with the supporting arms  43 ′,  44 ′ respectively in such a manner that when the inner ends of the two sliding shafts  32 ′ are coaxially slid within side opening ends  310 ′ of the control sleeve  31 ′ respectively, the supporting arms  43 ′,  44 ′ are correspondingly moved to control the engaging distance between the two supporting arms  43 ′,  44 ′. 
     As shown in  FIGS. 9 and 10 , the control sleeve  31 ′ has two inner thread portions provided at the two opening ends  310 ′ respectively, wherein each of the sliding shafts  32 ′ has an outer threaded portion slidably and rotatably engaging with the corresponding inner thread portion of the control sleeve  31 ′, such that when the control sleeve  31 ′ is driven to rotate via the adjuster  50 ′, the sliding shafts  32 ′ are slid correspondingly in a synchronized manner to control the engaging distance between the two supporting arms  43 ′,  44 ′. 
     The two inner thread portions of the control sleeve  31 ′ are extended in opposite spiral direction such that when the control sleeve  31 ′ is rotated at a clockwise direction, the sliding shafts  32 ′ are synchronically slid towards each other to minimize the engaging distance between the two supporting arms  43 ′,  44 ′. When the control sleeve  31 ′ is rotated at a counter clockwise direction, the sliding shafts  32 ′ are synchronically slid away from each other to maximize the engaging distance between the two supporting arms  43 ′,  44 ′. 
     The two supporting arms  43 ′,  44 ′ are two hollow arms respectively that a communication cable of the display screen  20 ′ is extended through one of the supporting arms  43 ′,  44 ′ so as to protectively conceal the communication cable within the respective supporting arm  43 ′,  44 ′. Therefore, the communication cable can provide signals and power required for the display screen  20 ′ and is hidden inside the two supporting arms  43 ′,  44 ′ so as to keep an aesthetic appearance. 
     Accordingly, the upper end portions of the supporting arms  43 ′,  44 ′ are affixed to the sliding panels  41 ′,  42 ′ respectively. The outer ends of the sliding shafts  32 ′ are coupled with the mid-portions of the supporting arms  43 ′,  44 ′ respectively such that when the sliding shafts  32 ′ are slid correspondingly in a synchronized manner to control the engaging distance between the two supporting arms  43 ′,  44 ′, the sliding panels  41 ′,  42 ′ are correspondingly slid with each other to ensure the two supporting arms  43 ′,  44 ′ being slid parallel to each other. 
     In order to couple the outer ends of the sliding shafts  32 ′ are coupled with the mid-portions of the supporting arms  43 ′,  44 ′ respectively, the outer ends of the sliding shafts  32 ′ are formed as two tubular sleeves  321 ′ to coaxially couple with the supporting arms  43 ′  44 ′ respectively. In other words, the supporting arms  43 ′,  44 ′ are coaxially slid through the tubular sleeves  321 ′ to be driven when the sliding shafts  32 ′ are rotated in responsive to the control sleeve  31 ′. 
     The adjuster  50 ′ comprises a manual turner, which is coaxially mounted to the control sleeve  31 ′, having a manipulating portion  51 ′ extending out of the interior cavity  13 ′ of the head pillow  10 ′ through the bottom side  12 ′ thereof to drive the control sleeve  31 ′ to rotate. The manipulating portion  51 ′ of the adjuster  50 ′ is arranged to be rotated to turn the control sleeve  31 ′ such that the control sleeve  31 ′ can be rotated in the clockwise or counter clockwise depending on which way the adjuster  50 ′ is rotated so as to adjust the engaging distance between the two supporting arms  43 ′  44 ′. 
     Preferably, the sliding panels  41 ′,  42 ′ are partially overlapped with each other wherein two outer edges of the sliding panels  41 ′,  42 ′ are affixed to the upper portions of the supporting arms  43 ′,  44 ′ respectively. Accordingly, when the sliding panels  41 ′,  42 ′ are slid with each other, the supporting arms  43 ′,  44 ′ are moved correspondingly. The sliding panels  31 ′,  32 ′ are preferably two metal panels that the sliding panels  41 ′,  42 ′ are supported within the interior cavity  13 ′ of the head pillow  10 ′ to rigidly support the display screen  20 ′ and the head pillow  10 ′. It is worth to mention that the sliding panels  41 ′,  42 ″ not only rigidly support the head pillow  10 ′ but also provide a stable sliding movement of each of the supporting arms  43 ′,  44 ′ in a synchronized manner. Therefore, the sliding panels  41 ′,  42 ′ enhance the support of the head pillow  10 ′ to substantially and securely retain the display screen  20 ′ in position and evenly distribute the applying force to the adjuster  50 ′ to drive the supporting arms  43 ′,  44 ′ to move in a synchronized manner. 
     The supporting frame  40 ′ further comprises a sliding enhancement unit  45 ′ for enhancing a sliding movement between the two sliding panels  41 ′,  42 ′, wherein the sliding enhancement unit  45 ′ contains two sliding slots  451 ′,  452 ′ provided at the sliding panels  41 ′,  42 ′ to align with each other and comprises a driving gear  453 ′ rotatably engaging with the sliding slots  451 ′,  452 ′ to enhance the sliding movement between the sliding panels  41 ′,  42 ′ in a synchronized manner. 
     As shown in  FIGS. 10 and 11 , one of the sliding slots  451 ′ has a bottom teething edge  4511 ′ engaging with a portion of a teething circumferential edge of the driving gear  453 ′ while another sliding slot  452 ′ has a top teething edge  4521 ′ engaging with an opposed portion of the teething circumferential edge of the driving gear  453 ′ such that the sliding panels  41 ′,  42 ′ are correspondingly slid with each other in a synchronized manner. 
     The thickness of the driving gear  453 ′ should be larger than an overall thickness of the sliding panels  41 ′,  42  such that when the sliding panels  41 ′,  42 ′ are overlapped, the driving gear  453 ′ is rotatably engaged with the sliding slots  451 ′,  452 ′ of the sliding panels  41 ′,  42 ′. 
     Accordingly, the bottom portion of the teething circumferential edge of the driving gear  453 ′ is tangently engaged with the bottom teething edge  4511 ′ of the sliding slot  451 ′ while the top portion of the teething circumferential edge of the driving gear  453 ′ is tangently engaged with the top teething edge  4521 ′ of another sliding slot  452 ′. In other words, when the sliding panels  41 ′,  42 ′ are overlappedly slid with each other, the driving gear  453 ′ is driven to rotate to synchronize the sliding movement of each of the sliding panels  41 ′,  42 ′. 
     The supporting frame  40 ′ comprises a base housing  46 ′ supported within the interior cavity  13 ′ of the head pillow  10 ′ to rigidly support the display screen  20 ′ at the rear side  11 ′ of the head pillow  10 ′, wherein the sliding panels  41 ′,  42 ′ are supported between a base wall of the base housing  46 ′ and the display screen  20 ′. 
     As shown in  FIG. 9 , the car seat head set further comprises a bottom enclosing cover  60 ′ mounted at the bottom side  12 ′ of the head pillow  10 ′ to enclose the interior cavity  13 ′ thereof. The enclosing cover  60 ′ has a tuner opening  61 ′ for the manipulating portion  51 ′ of the adjuster  50 ′ protruding therefrom such that the adjuster  50 ′ can be easily rotated by the user. The enclosing cover  60 ′ further has two elongated arm openings  62 ′,  63 ′ for the supporting arms  43 ′,  44 ′ extending out of the bottom side  12 ′ of the head pillow  10 ′ through the arm opening  62 ′,  63 ′ respectively. The enclosing cover  60 ′ provides a better protection for the display screen  20 ′ and the adjustable mounting arrangement against dirt and impact. 
     Referring to  FIG. 12 , a car seat head rest of a third embodiment illustrates an alternative mode of the second embodiment of the present invention. The car seat head rest comprises a head pillow  10 ″ having a rear side  11 ″, a bottom side  12 ″ and an interior cavity  13 ″, and a display screen  20 ″ supported at the rear side  11 ″ of the head pillow  10 ″. 
     The car seat head rest further comprises an adjustable mounting arrangement which comprises a length-adjustable sliding guider  30 ″ longitudinally supported within the interior cavity  13 ″ of the head pillow  10 ″, a supporting frame  40 ″ coupled with the sliding guider  30 ″, and an adjuster  50 ″ provided at the sliding guider  30 ″. 
     As shown in  FIG. 13 , the supporting frame  40 ″ comprises two overlapped sliding panels  41 ″,  42 ″ supported in the interior cavity  13 ″ of the head pillow  10 ″ in a slidably movable manner and two supporting arms  43 ″,  44 ″ downwardly and parallelly extended from the sliding panels  41 ″,  42 ″ respectively through the bottom side  12 ″ of the head pillow  10 ″ to define an engaging distance between the two supporting arms  43 ″,  44 ″. 
     The adjuster  50 ″ is provided at the sliding guider  30 ″ to control a length of the sliding guider  30 ″ so as to selectively adjust the engaging distance of the supporting arms  43 ″,  44 ″, wherein when the engaging distance of the supporting arms  43 ″,  44 ″ is adjusted corresponding to a distance between the two retention slots  2  of the car seat, the two supporting arms  43 ″,  44 ″ are adapted for slidably engaging with the two retention slots  2  respectively so as to securely support the head pillow  10 ′ on the car seat. 
     According to the third embodiment, the sliding guider  30 ″ comprises a control sleeve  31 ″ having two side opening ends  310 ″ and two sliding shafts  32 ″ slidably engaging with the control sleeve  310 ″ at a position that inner ends of the sliding shafts  32 ″ are coaxially and slidably engaging with the side opening ends  310 ″ of the control sleeve  31 ′ respectively while outer ends of the sliding shafts  32 ′ are coupled with the sliding panels  41 ″,  42 ″ respectively in such a manner that when the inner ends of the two sliding shafts  32 ″ are coaxially slid within side opening ends  310 ″ of the control sleeve  31 ″ respectively to drive the sliding panels  41 ″,  42 ″ to slide with each other, the supporting arms  43 ″,  44 ″ are correspondingly moved through the sliding panels  41 ″,  42 ″ to control the engaging distance between the two supporting arms  43 ″,  44 ″. 
     As shown in  FIG. 13 , the control sleeve  31 ″ has two inner thread portions provided at the two opening ends  310 ″ respectively, wherein each of the sliding shafts  32 ″ has an outer threaded portion slidably and rotatably engaging with the corresponding inner thread portion of the control sleeve  31 ″, such that when the control sleeve  31 ″ is driven to rotate via the adjuster  50 ″, the sliding shafts  32 ″ are slid correspondingly in a synchronized manner to control the engaging distance between the two supporting arms  43 ″,  44 ″. 
     The two inner thread portions of the control sleeve  31 ″ are extended in opposite spiral direction such that when the control sleeve  31 ″ is rotated at a clockwise direction, the sliding shafts  32 ″ are synchronically slid towards each other to minimize the engaging distance between the two supporting arms  43 ″,  44 ″. When the control sleeve  31 ″ is rotated at a counter clockwise direction, the sliding shafts  32 ″ are synchronically slid away from each other to maximize the engaging distance between the two supporting arms  43 ″,  44 ″. 
     Accordingly, the upper end portions of the supporting arms  43 ″,  44 ″ are pivotally coupled with the sliding panels  41 ″,  42 ″ respectively. The outer ends of the sliding shafts  32 ″ are coupled with two outer sides of the sliding panels  41 ″,  42 ″ respectively such that when the sliding shafts  32 ″ are slid correspondingly in a synchronized manner, the sliding panels  41 ″,  42 ″ are correspondingly driven to overlappedly slide with each other to control the engaging distance between the two supporting arms  43 ″,  44 ″ so as to ensure the two supporting arms  43 ″,  44 ″ being slid parallel to each other. It is worth to mention that the upper end portions of the supporting arms  43 ″,  44 ″ are pivotally coupling with the sliding panels  41 ″,  42 ″ at two outer sides thereof respectively to selectively adjust a tilt angle of the head pillow  10 ″ with respect to the car seat. 
     As shown in  FIGS. 13 to 15 , the car seat head rest further comprises an angle hinge  70 ″ for retaining the head pillow  10 ″ at the tilt angle. The angle hinge  70 ″ comprises a hinge base  71 ″, having a first teething portion  711 ″, coupling with one of the sliding panels  41 ″, a folding arm  72 ″ movably coupling with the corresponding sliding panel  41 ″ and having a second teething portion  721 ′ detachably engaging with the first teething portion  711 ″ of the hinge base  71 ″ to retain the sliding panels  41 ″,  42 ″ at the tilt angle, and a resilient element  73 ″ coaxially mounted to the hinge base  71 ″ for applying an urging force against the folding arm  72 ″ such that when the second teething portion  721 ″ of the folding arm  72 ″ is disengaged with the first teething portion  711 ″ of the hinge base  71 ″, the resilient element  73 ″ applies the urging force to push the head pillow  10 ″ back to an upright position with respect to the car seat. 
     Accordingly, the first and second teething portions  711 ″,  721 ″ are configured at one direction such that when the second teething portion  721 ′ is detachably engaged with the first teething portion  711 ″ of the hinge base  71 ″ to lock up the folding arm  72 ″ in position, the head pillow  10 ″ is retained at the tilt angle. It is worth to mention that when the head pillow  10 ″ is pivotally folded to its maximum tilt angle, the second teething portion  721 ″ of the folding arm  72 ″ will be disengaged with the first teething portion  711 ″ of the hinge base  71 ″ to allow the head pillow  10 ″ being returned back to its upright position. 
     The adjuster  50 ″ comprises a manual turner, which is coaxially mounted to the control sleeve  31 ″, having a manipulating portion  51 ″ extending out of the interior cavity  13 ″ of the head pillow  10 ″ through the bottom side  12 ″ thereof to drive the control sleeve  31 ″ to rotate. The manipulating portion  51 ″ of the adjuster  50 ″ is arranged to be rotated to turn the control sleeve  31 ″ such that the control sleeve  31 ″ can be rotated in the clockwise or counter clockwise depending on which way the adjuster is rotated so as to adjust the engaging distance between the two supporting arms  43 ″  44 ″. 
     The car seat head set further comprises a bottom enclosing cover  60 ″ mounted at the bottom side  12 ″ of the head pillow  10 ″ to enclose the interior cavity  13 ″ thereof. The enclosing cover  60 ″ has a tuner opening  61 ″ for the manipulating portion  51 ″ of the adjuster  50 ″ protruding therefrom such that the adjuster  50 ″ can be easily rotated by the user. The enclosing cover  60 ″ further has two elongated arm openings  62 ″,  63 ″ for the supporting arms  43 ″,  44 ″ extending out of the bottom side  12 ″ of the head pillow  10 ″ through the arm opening  62 ″,  63 ″ respectively. The enclosing cover  60 ″ provides a better protection for the display screen  20 ″ and the adjustable mounting arrangement against dirt and impact. 
     Preferably, the sliding panels  41 ″,  42 ″ are partially overlapped with each other wherein two outer edges of the sliding panels  41 ′,  42 ′ are pivotally coupled with the upper portions of the supporting arms  43 ″,  44 ″ respectively. Accordingly, when the sliding panels  41 ″,  42 ″ are slid with each other, the supporting arms  43 ″,  44 ″ are moved correspondingly. The sliding panels  31 ″,  32 ″ are preferably two metal panels that the sliding panels  41 ″,  42 ″ are supported within the interior cavity  13 ″ of the head pillow  10 ″ to rigidly support the display screen  20 ″ and the head pillow  10 ″. 
     The supporting frame  40 ″ further comprises a supporting bracket  45 ″ supported in the interior cavity  13 ″ of the head pillow  10 ″ to receive the sliding panels  41 ″,  42 ″ in the supporting bracket  45 ″, and a holding bracket  46 ″ affixed to the supporting bracket  45 ″ to support the display screen  20 ″ at the rear side  11 ″ of the head pillow  10 ″. Accordingly, the supporting bracket  45 ″ not only reinforces the structure of the head pillow  10 ″ but also supports the sliding panels  41 ″,  42 ″ in a sliding manner. 
     According to the third embodiment, the car seat head rest further comprises an entertainment unit  21 ″ detachably received with the holding bracket  46 ″, wherein the entertainment unit  21 ″ comprises a disc-media reader  22 ″ electrically linked to the display screen  20 ″ to form a portable media player to detachably supported by the holding bracket  46 ″ at a position that the display screen  20 ″ is supported at the rear side  11 ″ of the head pillow  10 ″. 
     Accordingly, the entertainment unit  21 ″ forms the portable media player to detachably mount to the head pillow  10 ″. The entertainment unit  21 ″ further comprises a battery that when the entertainment unit  21 ″ is mounted to the head pillow  10 ″, the passenger sitting at the back seat is able to watch movie or TV through the display screen  20 ″ at the rear side  11 ″ of the head pillow  10 ″ by inserting a disc into the entertainment unit  21 ″. Likewise, when the entertainment unit  21 ″ is detached from the head pillow  10 ″, the user is able to carry the entertainment unit  21 ″ from places to places. It is worth to mention that since the head pillow  10 ″ can be mounted to any car seat via the adjustable mounting arrangement, the user is able to fittingly mount the head pillow  10 ″ with the entertainment unit  21 ″ from one vehicle to another vehicle in tool-less manner. In addition, no power cable is required for electrically connecting the entertainment unit  21 ″ with the power source of the vehicle because the entertainment unit  21 ″ is built-in with battery. 
     One skilled in the art will understand that the embodiment of the present invention as shown in the drawings and described above is exemplary only and not intended to be limiting. 
     It will thus be seen that the objects of the present invention have been fully and effectively accomplished. The embodiments have been shown and described for the purposes of illustrating the functional and structural principles of the present invention and is subject to change without departure from such principles. Therefore, this invention includes all modifications encompassed within the spirit and scope of the following claims.