Patent Publication Number: US-2003230328-A1

Title: Self-positioning structure with adjustable frame body

Description:
BACKGROUND OF THE INVENTION  
       [0001] (a) Field of the Invention  
       [0002] The present invention relates to structure of a self-positioning structure, and in particular to a structure where the frame body can be conveniently positioned.  
       [0003] (b) Description of the Prior Art  
       [0004] Conventional self-positioning structure is shown in FIGS. 1 and 2. In operation, a wrench  16  has to be turned upward so that the teethed block  25  is disengaged with the teethed-face  15 , and the rotating frame  20  can be adjusted. When the rotating frame  20  has rotated to the desired angle, the wrench  16  has to be placed downward, and the teethed block  25  and the teethed-face  15  are in engagement again, so as to achieve the adjustment of the rotating frame body.  
       [0005] However, the conventional structure has the following drawbacks: (a) Inconvenient in Operation: In this operation both hands of the user have to be employed and it is not convenient for injured person or sick person where one of the hands may not be conveniently used, (b) The angle of adjustment is not accurate: When the user has adjusted the rotating frame body to an appropriate angle, the wrench  16  has to be operated in order to position the structure, and a careless movement of the hand will cause the angle of adjustment being inaccurate, (c) The angle of rotating is small. Due to the thickness of blocks  121 ,  122 , the angle of adjustment for the rotating frame body is about 90 only. Accordingly, it is an object of the present invention to provide a self-positioning structure with adjustable frame which mitigates the above drawbacks.  
       SUMMARY OF THE INVENTION  
       [0006] Accordingly, it is an object of the present invention to provide a self-positioning structure with adjustable frame body comprising a main frame body and a rotating body pivotally mounted to each other, characterized in that a pivotal sleeve is mounted to the main frame body and the upper section of the interior of the pivotal sleeve is a pivotal shaft for pivoting the rotating frame body, and the bottom end of the pivotal sleeve is mounted with a teethed sleeve inserted to the interior thereof, one end of the rotating body is downwardly formed into an extension section for inserting into the pivotal shaft, and the extension section is inserted beyond one end of the pivotal shaft and is mounted with a teethed block, a compression spring is supported by the teethed block and the bottom end of the pivotal shaft, and the teethed block is in engagement with the teethed sleeve, thereby a self-positioning structure with accurate angle of positioning angle is obtained.  
       [0007] Another object of the present invention is to a self-positioning structure with adjustable frame body, wherein a user can use a single hand to lift up the rotating frame body to adjust the angle, and when the hand is released, the rotating frame is self-positioned. Accordingly, the operation of positioning is conveniently achieved and the angle of positioning is accurate, and at the same time, the adjusted angle of the rotating frame is improved.  
       [0008] Other objects, advantages, and novel features of the invention will become more apparent from the following description when taken in conjunction with the accompanying drawings.  
     
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
     [0009]FIG. 1 is a perspective exploded view of a conventional self-positioning structure, showing the components and the relative position.  
     [0010]FIG. 2 is a schematic view of the conventional self-positioning frame showing the rotating body on the adjusting knot of the structure.  
     [0011] FIGS.  3  is a perspective exploded view of a self-positioning structure, showing the components and the relative position, in accordance with the present invention.  
     [0012]FIG. 4 is a sectional view of the self-positioning structure accordance with the present invention.  
     [0013]FIG. 5 is a schematic sectional view of the self-positioning structure, showing the relative position of the components in the course of adjusting movement in accordance with the present invention.  
     [0014]FIG. 6 is perspective view of the self-positioning structure when in use accordance with the present invention.  
    
    
     DETAILED DESCRIPTION OF THE PRESENT INVENTION  
     [0015] Referring to FIG. 3, there is shown a self-positioning structure with adjustable frame body comprising a main frame body  50  and a rotating frame body  60  pivotally mounted with each other. The main frame body  50  is extended downwardly for the mounting of a fixing rod  51 . The rotating frame body  60  is rotatable or positioned with respect to the main frame body  50 .  
     [0016] Referring to FIGS. 3 and 4, the main frame  50  corresponding to one lateral side of the rotating body  60  is provided with a hollow pivotal sleeve  52 . The upper section of the interior of the pivotal sleeve  52  is mounted with a pivotal shaft  55  with a bolt  53 . The top end of the pivotal shaft  55  is protruded with a resisting edge  56  which can resist the top edge of the pivotal sleeve  52 . The bottom end of the pivotal sleeve  52  makes use of a bolt  54  to mount a teethed sleeve  57  which has been inserted into the interior thereof. The bottom face of the teethed sleeve  57  is formed into a cavity  58  and the bottom end of the teethed sleeve  57  is provided with a seal  59  having a size smaller than that of the cavity  58  for the mounting of the rotating frame  60 . In accordance with the present invention, one end of the rotating body  60  is downwardly formed into an upright, extension section  61  for inserting into the pivotal shaft  55 , and the extension section  61  is inserted beyond one end of the pivotal shaft  55  and is mounted with a teethed block  64 . A compression spring  63  is supported by the teethed block  64  and the bottom end of the pivotal shaft  55 , and the teethed block  64  is in engagement with the teethed sleeve  57 . The other end of the rotating frame body  60  employs a connector  650  to mount an upward-extended elbow tube  65 , and a protruded block  66  is mounted to the elbow tube  65  after the tube  65  passes the seal  59 , and the top edge of the protruded block  66  is a lip edge  660  which urges the top face of the seal  59 . Accordingly, a self-positioning structure with accurate angle of positioning angle is obtained.  
     [0017] When in use, referring to FIGS. 4, 5, and  6 , one hand of the user holds the main frame  50  and the other hand lift up the main frame  60 , the teethed block  64  presses against the compression spring  63  and the teethed block  64  disengaged from the teethed sleeve  57  of the pivotal sleeve  52 , and the lip edge  660  is also away from the seal  59 . Thus the user can adjust the angle of the rotating frame  60  and when the rotating frame  60  is at an appropriate angle, the user then puts down the rotating frame body  60  and the teethed block  64  is again in engagement with the teethed sleeve  57 . At the same time, the lip edge  660  urges the top face of the seal  59  and the user can thus adjust the angle of the rotating body  60  with a single hand.  
     [0018] The advantages of the present invention are as follows:  
     [0019] (a) Convenient in Operation: The compression spring  63  allows the self-positioning of the rotating frame  60  and the operation can be achieved with a single hand. The operation is easy and convenient and rapid.  
     [0020] (b) Angle of positioning is accurate. As the rotating frame  60  is self-restoration to it position thereof, after the angle has been determined, the user can single handed release the rotating frame  60  and the positioning of the rotating frame  60  is at the most accurate position.  
     [0021] (c) Wide angle of adjustment: As there is no restriction by blocking parts, the angle of adjustment is at about 300 degree.  
     [0022] While the invention has been described with respect to a preferred embodiment, it will be clear to those skilled in the art that modifications and improvements may be made to the invention without departing from the spirit and scope of the invention. Therefore, the invention is not to be limited by the specific illustrative embodiment, but only by the scope of the appended claims