Abstract:
A head mount lamp seat comprises a pivotal unit, a movable unit and a rotary unit; wherein the movable unit is rotatably connected to one end of the pivotal unit; and another end of the pivotal unit is rotatably connected to the rotary unit; and a lamp is installed to the rotary unit. The rotary unit is rotatable horizontally with respect to the another end of the movable unit.

Description:
FIELD OF THE INVENTION 
   The present invention relates to lamps, and in particular to a head mount lamp seat comprises a pivotal unit, a movable unit and a rotary unit; wherein the movable unit is rotatably connected to one end of the pivotal unit; and another end of the pivotal unit is rotatably connected to the rotary unit. A lamp is installed to the rotary unit. The rotary unit is rotatable horizontally with respect to another end of the movable unit. 
   BACKGROUND OF THE INVENTION 
   Referring to  FIG. 9 , a conventional head mount lamp seat is illustrated. The prior art has a pivotal unit  81  and a retaining strip  14 . A lamp  82  is fixed to a cap  91 . The cap  91  is worn by people. In the prior art, the lamp  82  is only adjustable within a small range to a fourth position P 4 . It cannot be adjusted rightwards or leftwards or rearwards. Thereby the use of the prior art head mount lamp seat is limited. 
   SUMMARY OF THE INVENTION 
   Accordingly, the primary object of the present invention is to provide a head mount lamp seat which comprises a pivotal unit, a movable unit and a rotary unit; wherein the movable unit is rotatably connected to one end of the pivotal unit; and another end of the pivotal unit is rotatably connected to the rotary unit; a lamp is installed to the rotary unit; the rotary unit is rotatable horizontally with respect to the another end of the movable unit. 
   The various objects and advantages of the present invention will be more readily understood from the following detailed description when read in conjunction with the appended drawing. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIG. 1  is an exploded perspective view of the present invention. 
       FIG. 2  is a schematic view about the first embodiment of the present invention. 
       FIG. 3  is a schematic view about the second embodiment of the present invention. 
       FIG. 4  is a first schematic view showing the operation of  FIG. 2 . 
       FIG. 5  is a second schematic view about the operation of  FIG. 2 . 
       FIG. 6  is a third schematic view about the operation of  FIG. 2 . 
       FIG. 7  is a fourth schematic view about the operation of  FIG. 2 . 
       FIG. 8  is a schematic view of the third embodiment of the present invention. 
       FIG. 9  is a schematic view of a prior art structure. 
   

   DETAILED DESCRIPTION OF THE INVENTION 
   In order that those skilled in the art can further understand the present invention, a description will be described in the following in details. However, these descriptions and the appended drawings are only used to cause those skilled in the art to understand the objects, features, and characteristics of the present invention, but not to be used to confine the scope and spirit of the present invention defined in the appended claims. 
   With reference to  FIGS. 1 ,  2  and  3 , the head mount lamp seat of the present invention is illustrated. The present invention has the following elements. 
   A pivotal unit  10  has the following elements.
         A pivotal element  11  is included. In this the present invention, preferably, the pivotal unit  10  is a pair of pivotal ear portion.   A connecting seat  12  serves for fixing the pivotal element  11  and for connecting a cap  91  or a head mount  92  (referring to  FIG. 8 ). The connecting seat  12  is formed with a pair of connecting ears  13 . A retaining strip  14  passes through the connecting ears  13  so that the pivotal unit  10  can retain the cap  91  or the head mount  92  rapidly.       

   A movable unit  20  includes the following element:
         A connecting sheet  21  has two ends.   A first movably portion  22  is installed at one end of the rod  21 .       

   The first movably portion  22  has an approximate round shape. The first movably portion  22  is pivotally installed to the pivotal element  11  so that the movable unit  20  is pivoted to the pivotal unit  10  by the pivotal element  11 .
         A first retaining unit  40  is installed to the first movably portion  22 . The first retaining unit  40  has the following elements.
           A spring  41  is included.   Two first teeth disks  42  are installed to two ends of the spring  41 . Each first teeth disk  42  has a first teeth portion  421  facing toward the spring  41 .   Two second teeth disks  43  are installed at outer sides of the two first teeth disks  43 . Each second teeth disk  43  has a second teeth portion  431  facing toward the first teeth disk  42 .   A stud  44  passes through the pivotal element  11 , the spring  41 , the two first teeth disks  42  and the two second teeth disks  43 . A nut  45  screws with the stud  44  so as to compress the pivotal element  11 , spring  41 , two first teeth disks  43  and two second teeth disks  43 . Thereby the first teeth disks  42  are engaged to the second teeth disks  43 .   
           A second movable portion  23  is installed at another end of the connecting sheet  21 . The second movable portion  23  has an approximate round shape. A second retaining unit  40  is installed to the second movable portion  23 . The structure of second retaining unit  40  is identical to the first retaining unit  40 .       

   A rotary unit  30  is included. The second movable portion  23  serves to make the movable unit  20  to swing along the rotary unit  30 . The rotary unit  30  has the following elements. 
   A body is included. 
   A pivotal portion  31  is included. In this embodiment, the pivotal portion is a pair of pivotal ears. Thereby the rotary unit  30  can be installed to the second movable portion  23 . 
   A rotary teeth surface  32  protrudes from the body and has an axial hole  321 . 
   A sliding path  33  is a concave path in the body and arranged approximately around the rotary teeth surface  32 . 
   A retaining seat  34  serves for connecting a lamp  94 . 
   A fixed teeth surface  35  is corresponding to the rotary teeth surface  32 . The fixed teeth surface  35  is installed below the retaining seat  34  and around the axial hole  321 . Thereby the retaining seat  34  is rotatable continuously or step by step with respect to the rotary teeth surface  32 . 
   An auxiliary unit  36  is installed below the retaining seat  34  with respect to the sliding path  33 . 
   Referring to  FIG. 4 , the movable unit  20  swings to a first position P 1  around the pivotal element  11  of the pivotal unit  10  by the first movably portion  22  thereof. The pivotal portion  31  of the rotary unit  30  is rotatable around 360 degrees around the second movable portion  23  of the movable unit  20 . The headlight  94  at the first position can illuminate from the front end to the rear end (the rotation range can be greater than that illustrated in the drawings). 
   Referring to  FIG. 5 , the movable unit  20  swings to a second position P 2  from the first position P 1 , the pivotal portion  31  of the rotary unit  30  is rotatable around 360 degrees around the second movable portion  23  of the movable unit  20 . Thereby by adjusting the movable unit  20 , the headlight  94  can move forwards so as to illuminate farther places. In the second position P 2 , the headlight  94  can illuminate from the front end to the rear end (the rotation range can be greater than that illustrated in the drawings). 
   Referring to  FIG. 6 , when the movable unit  20  swings to a third position P 3  from the second position P 2 , the pivotal portion  31  of the rotary unit  30  is rotatable through 360 degrees around the second movable portion  23  of the movable unit  20 . In the third position P 3 , the headlight  94  is placed at a near place. In the second position P 3 , the headlight  94  can illuminate from the front end to the rear end (the rotation range can be greater than that illustrated in the drawings). 
   Referring to  FIG. 7 , when the movable unit  20  swings to any position around the first movably portion  22  on the pivotal element  11  of the pivotal unit  10 , the fixed teeth surface  35  and the auxiliary unit  36  are rotatable horizontally. The headlamp  94  is driven to rotate horizontally through 360 degrees on the pivotal unit  10 . The illumination range is from left to right, from near side to far side. 
   Thereby as shown in  FIGS. 3 and 8 , the rotary seat  34  is transversally fixed to the cap  91 , which can be adjusted to have will illumination range as a ball surface. 
   The present invention is thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the present invention, and all such modifications as would be obvious to one skilled in the art are intended to be included within the scope of the following claims.