Abstract:
Apparatus, devices, systems, and methods for clamping a length adjustable hook on a portable headrest with chin support to a top or side of a seat back, which is both adjustable and foldable to be portable for ease in transport. The horizontal chin rest pivotally attached to the bottom of a vertical member allows a sitting person&#39;s head to be supported in an upright position, while restricting movement both forward and side to side. The headrest can have telescoping vertical members which are length adjustable for different sized users. The chin support can have a cushion that is rotatable at different increments for comfort. The cushion can be slotted to allow the vertical member to be placed inside the slotted portion.

Description:
[0001]    This application is a Continuation-In-Part of U.S. patent application Ser. No. 14/154,290 filed Jan. 14, 2014, which is incorporated by reference in its&#39; entirety. 
     
    
     FIELD OF INVENTION 
       [0002]    This invention relates to attachable and detachable head supports, and in particular to apparatus, devices, systems, and methods for clamping a portable headrest with chin support on top a back of a seat, that is both adjustable and foldable for portability. 
       BACKGROUND AND PRIOR ART 
       [0003]    Passengers and travelers that travel over long distances with or without stop-over&#39;s typically have difficulty relaxing and falling asleep while sitting in upright positions. Most seats on aircraft, busses, trains and the like, have limited capability of allowing the seat to be fully reclined to a horizontal position. Most seats cannot fully recline since a reclined seat would hit against a passenger sitting behind. As such, the passenger/traveler has to try to relax and sleep in a generally upright position. 
         [0004]    A problem with sitting upright is that the head of the seated passenger/traveler will tend to fall sideways and foreword over time. Using one&#39;s hand to support one&#39;s head is difficult since there is nothing for the bent elbow to rest on, and is also uncomfortable. 
         [0005]    Seat belt harnesses and cross-chest straps may keep the passenger/traveler in a vertical position, but do not prevent their head from bending side to side or bending forward. 
         [0006]    A popular type of travel aid is the ergonomic pillow generally formed from foam with a side cut-out so that the pillow can wrap about one&#39;s neck. See for example, U.S. Des. D444,980 to Mowat et al. However, these types of pillows are best used by persons in generally horizontal sleeping positions, which do not have the problem of the passenger/traveler being in an upright sitting position where they can tend to fall forward. Additionally, these types of foam pillows can be quite bulky and are not easily collapsible. 
         [0007]    Attempts have been made of the years to attach headrests on seats. See for example, U.S. Pat. No. 42,084 to Hambujer; U.S. Pat. No. 104,473 to Lyon et al.; U.S. Pat. No. 162,784 to White; U.S. Pat. No. 221,752 to Taylor; U.S. Pat. No. 379,987 to Ryan; U.S. Pat. No. 426,069 to Rogers; U.S. Pat. No. 2,55,814 to Pulsifer; and U.S. Pat. No. 7,393,057 to Fraser. 
         [0008]    However, these headrest supports are generally limited to single pads, curved bars, which rest against the side or back of the head, and do not prevent the passenger/traveler from falling forward. Additionally, these devices are generally bulky, and do not fold up when not being used. 
         [0009]    Thus, the need exists for solutions to the above problems with the prior art. 
       SUMMARY OF THE INVENTION 
       [0010]    A primary objective of the present invention is to provide apparatus, devices, systems, and methods for clamping a portable headrest with chin support to a top or side of a seat back, with a clamp portion being adjustable for different size seat backs. 
         [0011]    A secondary objective of the present invention is to provide apparatus, devices, systems, and methods for clamping a portable headrest with chin support to a top or side of a seat back, having an adjustable chin support for supporting one&#39;s head at different heights depending on the size of the seated passenger. 
         [0012]    A third objective of the present invention is to provide apparatus, devices, systems, and methods for clamping a portable headrest with chin support to a top or side of a seat back, having a height adjustable chin support for supporting a seated passenger&#39;s head at different heights depending on the size of the seated passenger. 
         [0013]    A fourth objective of the present invention is to provide apparatus, devices, systems, and methods for clamping a portable headrest with chin support to a top or side of a seat back, having a padded chin support for comfortably supporting the chin of the seated passenger. 
         [0014]    A fifth objective of the present invention is to provide apparatus, devices, systems, and methods for clamping a portable headrest with chin support to a top or side of a seat back, that is foldable for ease in transport, when not being used. 
         [0015]    A sixth objective of the present invention is to provide apparatus, devices, systems, and methods for clamping a portable headrest with chin support to a top or side of a seat back having a vertical member that is length adjustable. 
         [0016]    A seventh objective of the present invention is to provide apparatus, devices, systems, and methods for clamping a portable headrest with chin support to a top or side of a seat back, having a clamp that is length adjustable. 
         [0017]    An eighth objective of the present invention is to provide apparatus, devices, systems, and methods for clamping a portable headrest with chin support to a top or side of a seat back, with a cushion on the chin support that is rotatable in different increments. 
         [0018]    Further objects and advantages of this invention will be apparent from the following detailed description of the presently preferred embodiments which are illustrated schematically in the accompanying drawings. 
     
    
     
       BRIEF DESCRIPTION OF THE FIGURES 
         [0019]      FIG. 1  is a rear top perspective view of the novel headrest in a deployed position. 
           [0020]      FIG. 2  is a front bottom perspective view of the headrest of  FIG. 1 . 
           [0021]      FIG. 3  is a rear bottom perspective view of the headrest of  FIG. 1 . 
           [0022]      FIG. 4  is another view of the headrest of  FIG. 3  folded for storage. 
           [0023]      FIG. 5  is a rear view of the headrest of  FIG. 1 . 
           [0024]      FIG. 6  is a left side view of the headrest of  FIG. 1 . 
           [0025]      FIG. 7  is a front view of the headrest of  FIG. 1 . 
           [0026]      FIG. 8  is a right side view of the headrest of  FIG. 1 . 
           [0027]      FIG. 9  is a top view of the headrest of  FIG. 1 . 
           [0028]      FIG. 10  is a bottom view of the headrest of  FIG. 1 . 
           [0029]      FIG. 11  is a rear view of the folded headrest of  FIG. 4 . 
           [0030]      FIG. 12  is a left side view of the folded headrest of  FIG. 4 . 
           [0031]      FIG. 13  is a front view of the folded headrest of  FIG. 4 . 
           [0032]      FIG. 14  is a right side view of the folded headrest of  FIG. 4 . 
           [0033]      FIG. 15  is a top view of the folded headrest of  FIG. 4 . 
           [0034]      FIG. 16  is a bottom view of the folded headrest of  FIG. 4 . 
           [0035]      FIG. 17  is an exploded perspective view of the headrest of the preceding figures. 
           [0036]      FIG. 18  is an enlarged view of the hook base and hook slide of the headrest of the preceding figures. 
           [0037]      FIG. 19A  is a cross-sectional view of the hook base and slide of the headrest of  FIG. 18  along arrows  19 X showing the release button and lock screw/bolt with the lock screw/bolt nested under spring pressure by spring into one of several detents in the base(a locked clamp position). 
           [0038]      FIG. 19B  is another cross-sectional view of the hook base and hook slide of  FIG. 18  along arrows  19 X with the release button being pressed and the lock screw/bolt released from the detent in the base(an unlocked clamp position). 
           [0039]      FIG. 20  is a partial cut-away detail of the clamp base of the headrest showing the head of the lock screw/bolt nested in the first base detent. 
           [0040]      FIG. 21  is another view of  FIG. 20  showing the head of the lock screw/bolt pushed out of the detent(the release button  40  on the opposite of the view is being pressed). 
           [0041]      FIG. 22  is another view of  FIG. 21  showing the hook slide adjusted and lock screw/bolt head nested in another detent. 
           [0042]      FIG. 23  is a side view of the headrest of the preceding figures clamped to a seat back. 
           [0043]      FIG. 24  is a perspective view of the headrest of the preceding figures showing chin rest being rotatable about the bottom tube for best location. 
           [0044]      FIG. 25  is a perspective view of the headrest of  FIG. 24  showing that the top and bottom tubes telescoping with one another and locked to a different overall length with the spring pin. 
           [0045]      FIG. 26  is a perspective view of the headrest of the preceding figures showing a person resting their chin on an installed and adjusted headrest. 
           [0046]      FIG. 27  is a top front perspective view of another version of the headrest with telescoping tubes retracted and chin rest folded up. 
           [0047]      FIG. 28  is another view of the headrest of  FIG. 27  with the chin rest half folded down showing motion arrows depicting the radial and linear adjustment possible in this configuration. 
           [0048]      FIG. 29A  is another view of the head rest of  FIG. 27  with the telescoping tubes fully extended and the chin rest fully deployed. 
           [0049]      FIG. 29B  is a view of the chin rest of  FIG. 29A  with an optional foam pad for the chin rest. 
           [0050]      FIG. 30  is a left side view of the headrest of  FIG. 27 . 
           [0051]      FIG. 31  is a right side view of the headrest of  FIG. 27 . 
           [0052]      FIG. 32  is a back view of the headrest of  FIG. 27 . 
           [0053]      FIG. 33  is a front view of the headrest of  FIG. 27 . 
           [0054]      FIG. 34  is a bottom view of the headrest of  FIG. 27 . 
           [0055]      FIG. 35  is a top view of the headrest of  FIG. 27 . 
           [0056]      FIG. 36  is a top front exploded perspective view of the head rest of  FIG. 27 . 
           [0057]      FIG. 37  is a side view of the headrest of  FIG. 27  with the chin rest folded fully up and the bottom telescoping tube about half extended. 
           [0058]      FIG. 38  is an enlarged cross-sectional view of the  FIG. 27  tube lock assembly along arrows  38 X. 
           [0059]      FIG. 39  is an enlarged detailed view of the cam follower and tube cam lock from  FIG. 37 . 
           [0060]      FIG. 40  is another side view of the head rest of  FIG. 37  with the chin rest starting to fold down (motion arrow). 
           [0061]      FIG. 41  is an enlarged detailed section view of tube lock assembly  250  of  FIG. 40  along arrows  41 X. 
           [0062]      FIG. 42  is an enlarged detailed view of the cam mechanism from  FIG. 40 . 
           [0063]      FIG. 43  is another side view of the head rest of  FIG. 37  with the chin rest fully folded down. 
           [0064]      FIG. 44  is an enlarged detailed cross-sectional view of the tube lock mechanism from  FIG. 43 . The expander flange can be seen fully compressing the O-ring locking the tubes together. 
           [0065]      FIG. 45  is an enlarged cross sectional view of the cam mechanism of  FIG. 43 . 
           [0066]      FIG. 46  is a top perspective view of another version of the headrest with a sliding metal hook assembly that uses a cam lock lever to set the hook extension. 
           [0067]      FIG. 47  is another view of the headrest of  FIG. 46  showing the cam lock lever oriented away from the upper tube indicating that the hook is unlocked. 
           [0068]      FIG. 48  is a cross-sectional view of the hook section of the headrest of  FIG. 46  along arrows  48 X. 
           [0069]      FIG. 49  is another cross-sectional view of  FIG. 47  along arrows  49 X showing cam locking surface out of contact with the hook leg top unlocking the assembly. 
           [0070]      FIG. 50  is an exploded view of the metal hook assembly of  FIG. 46 . 
           [0071]      FIG. 51  is a front perspective view of another version of the headrest with an adjustable, rotating chin rest. 
           [0072]      FIG. 52  is a rear perspective view of headrest of  FIG. 51 . 
           [0073]      FIG. 53  is a top perspective view of  FIG. 51  showing the chin rest, with the plastic hex core molded in, pulled off of the chin rest hex shaft. 
           [0074]      FIG. 54  is a perspective view of the chin rest of  FIG. 52  with the hex core removed. 
           [0075]      FIG. 55  is an enlarged view of the chin rest cavity (for the hex core), the hex core of  FIG. 53 , and the end of the chin rest hex shaft. 
           [0076]      FIG. 56  is an end view of the headrest of the preceding Figures showing the extent of the chin rest cushion adjustment. 
           [0077]      FIG. 57  is a side view of the headrest of  FIG. 56 . 
           [0078]      FIG. 58  is a cross sectional view of the chin rest of  FIG. 57  along arrows  58 X showing the hex shape of the interlocking parts. 
           [0079]      FIG. 59  is a top perspective view of the headrest of the preceding Figures with the adjustable chin rest. The chin rest is adjusted to its maximum height. 
           [0080]      FIG. 60  is another top perspective view of the headrest of  FIG. 59  with the chin rest adjusted 45 degrees from its maximum height. 
           [0081]      FIG. 61  is another top perspective view of the headrest of  FIG. 59  with the chin rest adjusted 90 degrees from its maximum height. 
           [0082]      FIG. 62  is another top perspective view of the headrest of  FIG. 59  with the chin rest adjusted 135 degrees from its maximum height. 
           [0083]      FIG. 63  is another top perspective view of the headrest of  FIG. 59  with the chin rest adjusted 180 degrees from its maximum height. 
           [0084]      FIG. 64  is another top perspective view of the headrest of  FIG. 63  with the chin rest folded up. 
           [0085]      FIG. 65  is a perspective view of the chin rest of the preceding Figures hooked over the side of a seat back with the user resting the side of their head against the cushion. 
           [0086]      FIG. 66  is a rear perspective view of the chin rest with a slotted chin rest pad. Chin rest shown folded down. 
           [0087]      FIG. 67  shows the chin rest pad folded up showing the top tube nesting into the chin rest pad slot. 
       
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0088]    Before explaining the disclosed embodiments of the present invention in detail it is to be understood that the invention is not limited in its applications to the details of the particular arrangements shown since the invention is capable of other embodiments. Also, the terminology used herein is for the purpose of description and not of limitation. 
         [0089]    In the Summary above and in the Detailed Description of Preferred Embodiments and in the accompanying drawings, reference is made to particular features (including method steps) of the invention. It is to be understood that the disclosure of the invention in this specification includes all possible combinations of such particular features. For example, where a particular feature is disclosed in the context of a particular aspect or embodiment of the invention, that feature can also be used, to the extent possible, in combination with and/or in the context of other particular aspects and embodiments of the invention, and in the invention generally. 
         [0090]    In this section, some embodiments of the invention will be described more fully with reference to the accompanying drawings, in which preferred embodiments of the invention are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will convey the scope of the invention to those skilled in the art. Like numbers refer to like elements throughout, and prime notation is used to indicate similar elements in alternative embodiments. 
         [0091]    A list of components will now be described.
     10  Portable seat back headrest.     20  Hook base.     30  Hook slide.     40  Hook release button.     50  Hook lock screw/bolt with enlarged head.     60  Lock screw slot in base.     70  Lock detents in base.     80  Release spring.     90  Top tube.     100  Holes in top tube for length adjustment.     110  Spring pin in bottom tube for length adjustment.     120  Bottom tube.     130  Rotating chin rest hinge allows chin rest to rotate about bottom tube.     140  Chin rest hinge pin.     150  Bottom tube cap.     160  Chin rest.     170  Chin rest foam cushion tube fits over chin rest.     180  Seat back.     190  Chin rest user.     200  second headrest.     210  second headrest top tube.     220  second headrest bottom tube.     240  second headrest optional chin rest cushion.     250  Tube lock assembly.     260  Tube lock adjustment nut.     270  Tube lock adjustment washer.     280  Tube lock O-ring expander flange.     290  Tube lock fixed flange.     300  Tube lock spring.     310  Tube lock spring washer.     320  Spring adjustment spacer.     330  Tube lock O-ring (uncompressed).     335  Tube lock O-ring (compressed).     340  Tube lock shaft.     350  Cam follower.     360  Top tube bushing.     370  Chin rest mounting flange.     380  second headrest chin rest with integrated tube lock cam.     390  Tube lock cam.     400  Linear motion arrow of telescoping tube length.     410  Radial motion arrow of chin rest rotation.     420  Curve motion arrow of chin rest folding down.     430  Linear motion of tube lock shaft pulling expander flange down as a result of tube lock cam rotation.     440  Headrest with metal cam lock hook.     450  hook.     455 . right opening     460  hook leg.     470  Cam lock bracket.     480  Cam lock lever.     485  Locking cam surface of cam lock lever.     490  Cam lock pin.     500  Cam stop bracket.     510  Cam stop pin.     520  Hook mount finial.     530  Finial base.     540  Finial mount screw.     550  Adjustable, rotating chin rest.     560  Chin rest cushion.     565  Cavity in chin rest cushion contains chin rest hex core.     570  Cushion hex core is molded or sewn into cushion.     580  Folding chin rest with hex shaft.     590  Chin rest hex shaft.     600  pad     610  slot   
 
         [0156]      FIG. 1  is a rear top perspective view of the novel headrest  10  in a deployed position.  FIG. 2  is a front bottom perspective view of the headrest  10  of  FIG. 1 .  FIG. 3  is a rear bottom perspective view of the headrest  10  of  FIG. 1 . 
         [0157]      FIG. 4  is another view of the headrest of  FIG. 3  folded for storage. 
         [0158]      FIG. 5  is a rear view of the headrest  10  of  FIG. 1 .  FIG. 6  is a left side view of the headrest  10  of  FIG. 1 .  FIG. 7  is a front view of the headrest  10  of  FIG. 1 .  FIG. 8  is a right side view of the headrest  10  of  FIG. 1 .  FIG. 9  is a top view of the headrest  10  of  FIG. 1 .  FIG. 10  is a bottom view of the headrest  10  of  FIG. 1 . 
         [0159]    Referring to  FIGS. 1-3  and  5 - 10 , the novel head rest  10  includes a hook base  20  attached to the upper end of a top tube  90 . A hook slide  30  with hook release button  40  can slide relative to a lock screw slot  60  in base  20  having lock detents  70  in the base  20 . The top tube  90  can telescopingly slide about a bottom tube  120 . An outwardly extending spring biased pin  110  in bottom tube  120  can pop in and out of through holes  100  in the top tube  90  that allow for different height adjustment of the top tube  90  relative to bottom tube  120 . 
         [0160]    A rotating chin rest hinge  130  held in place by bottom tube cap  150  allows for horizontally attached chin rest  160  to pivot horizontally relative to the lower end of the bottom tube  120 . A chin rest hinge pin  140  attached to the rest hinge  130  and the horizontal chin rest  160 , allows for the chin rest  160  to pivot up relative to the pivot pin  140 . A cushion sleeve  170  such as a foam sleeve can wrap about the chin rest  160 . 
         [0161]      FIG. 11  is a rear view of the folded headrest  10  of  FIG. 4 .  FIG. 12  is a left side view of the folded headrest  10  of  FIG. 4 .  FIG. 13  is a front view of the folded headrest  10  of  FIG. 4 .  FIG. 14  is a right side view of the folded headrest  10  of  FIG. 4 .  FIG. 15  is a top view of the folded headrest  10  of  FIG. 4 .  FIG. 16  is a bottom view of the folded headrest  10  of  FIG. 4 . 
         [0162]    Referring to FIGS.  4  and  11 - 16 , the novel headrest  10  can collapsed into a folded position with the hook slide  30  slid inwardly along lock screw slot  60  of the hook base. The top tube  90  can be slid down over bottom tube  120  to be substantially concentric and overlying with one another. The chin rest  160  can be pivoted about chin rest hinge pin  140 , and folded upward by hinge pin  140 , so that the chin rest  160  is parallel to overlying tubes  90 ,  120 , and hook base  20  is parallel to rest hinge  130 . 
         [0163]    The folded headrest  10  can be sized in order to fit in a user&#39;s pocket, a backpack, a briefcase, handbag, and the like. Additionally, the headrest can be made from lightweight materials, and the like. 
         [0164]      FIG. 17  is an exploded perspective view of the headrest  10  of the preceding figures. The detail of the hook lock screw  50  with release spring  80  which can overlay the threaded end of the screw  50  and a hook release button  40 . 
         [0165]      FIG. 18  is an enlarged view of the hook base  20  and hook slide  30  of the headrest  10  of the preceding figures. 
         [0166]      FIG. 19A  is a cross-sectional view of the hook base  20  and slide  30  of the headrest  10  of  FIG. 18  along arrows  19 X showing the release button  40  and lock screw/bolt  50  with the lock screw/bolt  50  nested under spring pressure by spring  80  into one of several detents  70  in the base  20 . In this view, the hook slide  30  (clamp) is locked in a fixed horizontal position. 
         [0167]      FIG. 19B  is another cross-sectional view of the hook base  20  and hook slide  30  of  FIG. 18  along arrows  19 X with the release button  40  being pressed and the lock screw/bolt  50  released from the detent  70  in the base  20 . In this view, the hook slide  30 (clamp) is unlocked and is adjustable for different thickness widths of the back of the seat. 
         [0168]      FIG. 20  is a partial cut-away detail of the clamp base  20  of the headrest showing the head of the lock screw/bolt  50  nested in the first base detent  70 . 
         [0169]      FIG. 21  is another view of  FIG. 20  showing the head of the lock screw/bolt  50  pushed out of the detent  70  (the release button  40  on the opposite of the view is being pressed). The hook slide  30  can then be adjusted slide relative to the hook base  20 . 
         [0170]      FIG. 22  is another view of  FIG. 21  showing the hook slide  30  adjusted and the lock screw/bolt  50  head nested in an alternate detent  70 . 
         [0171]      FIG. 23  is a side view of the headrest  10  of the preceding figures with the hook slide  30  having an outer hook end clamped to a rear surface edges of the seat back  160 , with the top tube  90  on the front side of seat back  160   
         [0172]      FIG. 24  is a perspective view of the headrest  10  of the preceding figures showing chin rest  160  with cushion sleeve  170  being rotatable in a horizontal direction about the bottom vertical tube  190  for best location. 
         [0173]      FIG. 25  is a perspective view of the headrest  10  of  FIG. 24  showing that the top tube  90  and bottom tube  120  telescoping with one another and locked to a different overall length by the outwardly spring biased pin  110 . 
         [0174]      FIG. 26  is a perspective view of the headrest  10  of the preceding figures showing a person  190  resting their chin on the chin rest  160  with cushioned sleeve  170  of the installed and adjusted headrest  10 . 
         [0175]    The novel headrest  10  can be made from components, such as but not limited to metal, such as aluminum, galvanized metal, and the like, or plastic, or combinations thereof. 
         [0176]    Another alternative version of the headrest is to have the clamp member, vertical member, and chin rest, to be formed from a pliable material. For example, another headrest can have a possible Z shape formed from a one piece of pliable material, such as aluminum, with a cushion overlayer. The pliable under support can be bent into shape, so that the clamp portion can bend about the top of a backrest, and the chin rest bent into a desired configuration. The pliable material can have a memory when manipulated into a selected shape. Additionally, parts of the headrest can have pliable parts, such as the chin rest, and/or the vertical member and/or the clamp member. 
         [0177]    Although the preferred embodiment shows the chin rest portion having a cushion thereon, the novel headrest can also have a cushion about the vertical member. Additionally, the clamp member(s) can also have a cushion. 
         [0178]    The invention can have additional shapes as needed. For example, the vertical member can have a pad or blinder shape, having a cushion surface with sufficient space for resting a user&#39;s face against. The pad and/or blinder can also be bendable. For example, there can be an underlying material, such as but not limited to aluminum, with a cushion face, with the underlying material having a memory when bent into a selected configuration. 
         [0179]    The novel headrest  10  can be configured so that the vertical member is on the left side of the user&#39;s face or on the right side of their face. Additionally, two headrests  10  can be used so that the vertical members are on both the left side and right side of the user&#39;s face. Still another version can be headrest having both a left vertical member and a right vertical member. 
         [0180]      FIG. 27  is a top front perspective view of another version of the headrest  200  with telescoping tubes  210 ,  220  retracted and chin rest folded up in the up direction of arrow  400 . The top tube  210  and bottom tube  220  are not locked together in this configuration. 
         [0181]      FIG. 28  is another view of the headrest  200  of  FIG. 27  with the chin rest  380  half folded down showing motion arrows  410  depicting the radial and linear adjustment possible in this configuration. The telescoping tube length of tubes  210 ,  220  can be adjusted along with the rotation of the chin rest  380  relative to the hook base  20  and hook slide  30 . 
         [0182]      FIG. 29A  is another view of the headrest  200  of  FIG. 27  with the telescoping tubes  210 ,  220  fully extended and the chin rest fully deployed. The top and bottom tubes  210 ,  220  are locked together in this configuration which will be shown and described later. Folding the chin rest  380  down fully locks the tubes  210 ,  220  together. 
         [0183]      FIG. 29B  is a view of the chin rest  380  of  FIG. 29A  with an optional foam pad  240  for the chin rest  380 . 
         [0184]      FIG. 30  is a left side view of the headrest  200  of  FIG. 27 .  FIG. 31  is a right side view of version of the headrest  200  of  FIG. 27 .  FIG. 32  is a back view of the headrest  200  of  FIG. 30 .  FIG. 33  is a front view of the headrest  200  of  FIG. 27 .  FIG. 34  is a bottom view of the headrest  200  of  FIG. 27 .  FIG. 35  is a top view of the headrest  200  of  FIG. 27 . 
         [0185]      FIG. 36  is a top front exploded perspective view of the headrest  200  of  FIG. 27 . Here, the top tube  210 , bottom tube  220 , and tube lock shaft  340  have been truncated to in order to show all of the components. 
         [0186]      FIG. 37  is a side view of the headrest of  FIG. 27  with the chin rest  380  folded fully up and the bottom telescoping tube  220  about half extended. The top and bottom tubes  210 ,  220  are ghosted to view the tube lock assembly  250 . A top tube bushing  360  is frictionally fit into the hollow bottom end of the upper tube  210  with the upper end of the lower tube  220  fitting inside the top tube bushing  360 . The chin rest mount flange  370  is sectioned to view the tube cam lock  390 . 
         [0187]      FIG. 38  is an enlarged cross-sectional view of the  FIG. 27  tube lock assembly  250  along arrows  38 X. Space can be seen between the O-ring and the inside wall of the top tube indicating that the tubes are not locked together. 
         [0188]      FIG. 39  is an enlarged detailed view of the cam follower  350  and tube cam lock  390  from  FIG. 37 . 
         [0189]    Referring to  FIGS. 36-39  uncompressed O-ring  330  is not jammed against inner wall of upper tube  210  and the bottom edges of tube lock O-ring  280  is raised out of the circumferential cavity in the upper surface of tube lock fixed flange  290 . This allows for bottom tube  220  to move up and down relative to top tube  210  to adjust the overall telescoping length of top tube  210  and bottom tube  220 . Once the user finds a selected length, the chin rest  380  is rotated downward along arrow  420 (shown in  FIG. 45 ). 
         [0190]      FIG. 40  is another side view of the head rest  200  of  FIG. 37  with the chin rest  380  starting to fold down along motion arrow  420 . The cam follower  350  is riding on the tube lock cam  390  (part of the chin rest) which allows the attached shaft  340  to drop under pressure from the spring. 300 . As the shaft  340  drops in the direction of arrow  430 , it pulls down the expander flange  280  which begins to expand the O-ring  330 . The tubes  210 ,  220  are not locked together in this configuration. The arrow  430  shows the linear motion of the tube lock shaft  340  pulling expander flange  280  down as a result of the tube lock cam  390  rotation along arrow  420 . The expander flange  280  stretches the O-ring  330  outward  330 / 335  and jam it between the inside wall of the top tube  210  and the fixed flange  290 . This locks the tubes  210 ,  220  together when the chin rest  380  is completely folded down. 
         [0191]    As shown in  FIG. 40 , a tube lock adjustment nut  260  rotated about exterior threads of tube lock shaft  340  fixes the location of tube lock adjustment washer  270  and tube lock O-ring expander flange  280 . Tube lock fixed flange  290  can have a lower end with shoulder portions that rest on tube lock spring  300  which presses against tube lock spring washer  310  and spring adjustment washer  320   
         [0192]      FIG. 41  is an enlarged detailed section view of tube lock assembly  250  of  FIG. 40  along arrows  41 X. The expander flange  280  can be seen dropping causing the O-ring  330 / 335  to expand outward toward the inside wall of the upper tube  210 . No space can be seen between the O-ring  330 / 335  and the inside wall of the upper tube  210 . 
         [0193]      FIG. 42  is an enlarged detailed view of the tube lock cam  390  and cam follower  350  from  FIG. 40 . 
         [0194]      FIG. 43  is another side view of the headrest  200  of  FIG. 37  with the chin rest  380  fully folded down along arrow  420 . The cam follower  350  has dropped to the cams low point on tube cam lock  390  allowing the expander flange  280  to fully compress the O-ring  335  between the fixed flange  290  and the inner wall of the upper tube  210 . The tubes  210 ,  220  are locked together in this configuration. 
         [0195]      FIG. 44  is an enlarged detailed cross-sectional view of the tube lock assembly  250  of  FIG. 43  along arrows  44 X. The expander flange  280  can be seen fully compressing the O-ring  335  locking the tubes  210 ,  220  together.  FIG. 45  is an enlarged cross sectional view of the tube cam lock  390  and cam follower  350  of  FIG. 43 . 
         [0196]    Referring to  FIGS. 40-45  compressed O-ring  335  is shown as generally jammed against inner wall of upper tube  210  and the bottom edges of tube lock O-ring  280  are generally fit into the circumferential cavity in the upper surface of tube lock fixed flange  290 . This allows for bottom tube  220  to be in a locked position relative to top tube  210 . In the locked position, the user can rest their chin on the folded down chin rest  380 . Once the user is finished the chin rest  380  can be rotated upward in an opposite direction to arrow  420 , which allows the bottom tube  220  to move telescoping downward relative to the top tube  210 . 
         [0197]      FIG. 46  is a top perspective view of another version of the headrest  440  with a sliding metal hook assembly that uses a cam lock lever  480  to set the hook extension position of the hook end (metal hook)  450 . This view shows the cam lock lever  480  oriented toward the upper tube  210  indicating that the hook  450  is locked in a length position. 
         [0198]      FIG. 47  is another view of the headrest  440  of  FIG. 46  showing the cam lock lever  480  oriented away from the upper tube  210  indicating that the hook  480  is unlocked. 
         [0199]      FIG. 48  is a cross-sectional view of the hook section of the headrest of  FIG. 46  along arrows  48 X. The cam locking surface  485  puts pressure on the top of the hook leg  460  locking the hook leg  460  and the metal hook end  450  together and setting the hook extension  450  at a fixed extension. 
         [0200]      FIG. 49  is another cross-sectional view of  FIG. 47  along arrows  49 X showing the cam locking surface  485  out of contact with the top of the hook leg  460  unlocking the assembly.  FIG. 50  is an exploded view of the metal hook assembly components of  FIG. 46 . 
         [0201]    Referring to  FIGS. 46-50 , a final base  530  frictionally fit into the hollow upper end of top tube  210  can have a mount screw  540  screwed into an opening in the right end of hook leg  460  an into the threaded opening in the bottom of hook mount finial  520 . A cam stop bracket  500  can be generally fixed to a left end of the hook leg  460  by a cam stop pin  510 . A cam lock bracket  470  can be generally fixed to the right end of bent hook end  450  by raised dimple(in the bottom of cam lock bracket that fits into the right hole  455  of the bent hook end  450 . A rotatable cam lock lever is pivotally attached to opening(s) in the raised side flanges of the cam lock bracket  470  by a cam lock pin  490 . 
         [0202]      FIG. 51  is a front perspective view of another version of the headrest  440  with an adjustable, rotating chin rest  550 . 
         [0203]      FIG. 52  is a rear perspective view of headrest  440  of  FIG. 51 . 
         [0204]      FIG. 53  is a top perspective view of  FIG. 51  showing the chin rest  550 , with the plastic hex core  570  molded in, pulled off of the chin rest hex shaft  590 . The hex core  570  and the chin rest hex shaft  590  can have an octagonal shape that locks them together radially but allows for them to be oriented in 45 degree increments to each other. This enables the chin rest cushion  560  to be raised or lowered to meet the needs of taller or shorter users. 
         [0205]      FIG. 54  is a perspective view of the chin rest  550  of  FIG. 52  with the hex core  570  removed. 
         [0206]      FIG. 55  is an enlarged view of the chin rest cavity  565  for the hex core  570  of  FIG. 53 , and the end of the chin rest hex shaft  590 . 
         [0207]      FIG. 56  is an end view of the headrest  550  of the preceding Figures showing the extent of the chin rest cushion  560  adjustment. 
         [0208]      FIG. 57  is a side view of the headrest  550  of  FIG. 56 . 
         [0209]      FIG. 58  is a cross sectional view of the chin rest of  FIG. 57  along arrows  58 X showing the hex shape of the interlocking parts. 
         [0210]    Referring to  FIGS. 51-58 , the chin rest  550  can pivot from a folded position adjacent tubes  210 ,  220  to a perpendicular extended position by rotating relative to chin rest hinge pin  140 . The chin rest  550  can rotate in 45 degree increments about chin rest hex shaft  590 . The hex core  570  inside the cushion  560  fits over hex shaft  590  and indexes radially  580  to facilitate adjustment of the cushion  560  in approximately 45 degree increments. 
         [0211]      FIG. 59  is a top perspective view of the headrest  440  of the preceding Figures with the adjustable chin rest  550 . The chin rest  550  is adjusted to its maximum height. 
         [0212]      FIG. 60  is another top perspective view of the headrest  440  of  FIG. 59  with the chin rest  550  adjusted 45 degrees from its maximum height. 
         [0213]      FIG. 61  is another top perspective view of the headrest  440  of  FIG. 59  with the chin rest  550  adjusted 90 degrees from its maximum height. 
         [0214]      FIG. 62  is another top perspective view of the headrest  440  of  FIG. 59  with the chin rest  550  adjusted 135 degrees from its maximum height. 
         [0215]      FIG. 63  is another top perspective view of the headrest  440  of  FIG. 59  with the chin rest  550  adjusted 180 degrees from its maximum height. This is the chin rests minimum height. Rotational adjustment can be up to approximately 225 degrees, approximately 270 degrees, and approximately 315 degrees. 
         [0216]      FIG. 64  is another top perspective view of the headrest  440  of  FIG. 63  with the chin rest  550  folded up against tube  210 . 
         [0217]      FIG. 65  is a perspective view of the chin rest  440  of the preceding Figures hooked over the side of a seat back  180  with the user  190  resting the side of their head against the chin rest cushion  560 .  FIG. 66  shows an alternate use to the original configuration of hooking the chin rest  440  over the top of the seat back  180  and resting your chin on the rest as shown in previous Figures. 
         [0218]      FIG. 66  is a rear perspective view of the headrest  440  with a chin rest pad  600  and slotted portion  610 , with the chin rest  600  shown folded down. 
         [0219]      FIG. 67  shows the chin rest pad  600  folded up with the top tube  210  nesting into the chin rest pad slot  610 . 
         [0220]    With the pad slot  610 , the top tube  210  can rest inside the pad  600  reducing the space needed for storage of the headrest  440 . Also, in the configuration shown in  FIG. 67 , the headrest  440 , the hook  450  with hook leg  460  can be wrapped over the top of a seat back so that the user can also rest their head against the rear surface of the chin rest pad  600 . 
         [0221]    While some embodiments show cushions on the chin rests, the invention can be alternatively used with cushions wrapped about the vertical members, or having separate cushions about the chin rest and about the vertical members. 
         [0222]    The invention can be used with a pillow also positioned on the chin rest that has no cushion or includes a cushion. 
         [0223]    While a preferred embodiment of the invention uses the novel headrest on airplane passenger seats, the novel headrests can be used on other types of seats, such as but not limited to bus passenger seats, train passenger seats, automobile seats, truck seats, van seats, and the like. 
         [0224]    Although some components have been described as being made of metal, the components can be made of different types of materials, such as but not limited to plastic, or vice versa, combinations of metal and plastic, and the like. 
         [0225]    While the invention has been described, disclosed, illustrated and shown in various terms of certain embodiments or modifications which it has presumed in practice, the scope of the invention is not intended to be, nor should it be deemed to be, limited thereby and such other modifications or embodiments as may be suggested by the teachings herein are particularly reserved especially as they fall within the breadth and scope of the claims here appended.