Abstract:
A hinge includes first and second holders, which are fixedly inserted in a doorframe and a door plank respectively, and a hinge pivoting the holders together; the hinge includes several first and second bent arms, which have first and second holes on two tail ends, and an intermediate hole; a pivotal pin is passed through the intermediate holes; another pin is passed through the first holes of the first arms to pivot the first arms to the first holder; yet another pin is passed through the first holes of the second arms to pivot the second arms to the second holder; a sliding pin is passed through the second holes of the first arms and passed into opposing upper and lower slots of the second holder; a second sliding pin is passed through the second holes of the second arms and passed into opposing slots of the first holder.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    1. Field of the Invention 
         [0002]    The present invention relates to a hidden type of hinge structure, more particularly one, which can be accurately installed with ease, and which will move smoothly when the door plank is being pivoted. 
         [0003]    2. Brief Description of the Prior Art 
         [0004]    A door plank is coupled to a doorframe with hinges so as to swing between an open position and a close one. Referring to  FIG. 6 , a currently existing hinge structure includes two hinges  91 . Each of the hinges  91  comprises a pivotal part  912 , and two connecting plates  911 , which are joined to the pivotal part  912  so as to pivot relative to each other, and are securely joined to a doorframe  93 , and a door plank  92  respectively; one of the hinges  91  is disposed near to a lower end of the door plank  92 , and the other near to an upper end in order to increase stableness of the door plank  92 . 
         [0005]    In installation, both the hinges  91  have to be positioned in such a manner that the pivotal parts  912  are aligned on a vertical line-otherwise the door plank  92  will be subjected too much friction when pivoting to/away from the shut position, and it can even be hindered from pivoting to/away from the shut position by the doorframe  93  Furthermore, the edges of the door plank  92  won&#39;t be able to be closely in touch with the doorframe  93  after the door plank  92  is shut. However, it takes relatively much labor and time to make the pivotal parts  912  of the hinges  91  accurately aligned on a vertical line in installation, and it will be relatively difficult for a person to adjust the hinges  91  if he fails to place the hinges in a proper position. 
       SUMMARY OF THE INVENTION 
       [0006]    It is a main object of the present invention to provide an improvement on a hinge structure to overcome the above problems. 
         [0007]    A hinge structure according to an embodiment of the present invention includes first and second holding members, which are inserted in and secured to a doorframe and a door plank respectively, and a hinge pivoting the holding members together. The hinge includes several first and second swinging bent arms, which have first and second holes on two tail ends, and an intermediate hole. A connecting pin is passed through the intermediate holes so as to pivot the arms together. A first pivotal pin is passed through the first holes of the first arms to pivot the first arms to the first holding member while a second pivotal pin is passed through the first holes of the second arms to pivot the second arms to the second holding member. A first sliding pin is passed through the second holes of the first arms and passed into opposing upper and lower slots of the second holding member while a second sliding pin is passed through the second holes of the second arms and passed into opposing slots of the first holding member; thus, the door plank can be pivoted on the doorframe between a closed position and an opened one with the first arms pivoting on the first pivotal pin, the second arms pivoting on the second pivotal pin, and with the sliding pins moving on the corresponding slots. Furthermore, the hinge will be hidden within the door plank and the doorframe after the door plank is closed. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0008]    The present invention will be better understood by referring to the accompanying drawings, wherein: 
           [0009]      FIG. 1  is a fragmentary exploded perspective view of the hinge of the present invention, 
           [0010]      FIG. 2  is a front sectional view of the present invention, 
           [0011]      FIG. 3  is a front view of the present invention, 
           [0012]      FIG. 4  is a horizontal sectional view, taken after the hinge is fitted on a door plank and a doorframe, and the door plank is opened, 
           [0013]      FIG. 5  is a horizontal sectional view, taken after the hinge is fitted on a door plank and a doorframe, and the door plank is closed, and 
           [0014]      FIG. 6  is a front view of the prior art. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0015]    Shown in  FIGS. 1 ,  2 , and  3  is a preferred embodiment of a hidden type of hinge structure of the present invention, which is used to pivot a door plank  2  to a doorframe  1 . The hidden hinge structure includes: 
         [0016]    (a) a first holding member  3  joined to the doorframe  1 , the first holding member  3  comprises a connecting panel  31  secured on the doorframe  1 , and several hollow holding portions  32 , which are arranged one on top of another next to one side of the connecting panel  31 , and which are inserted in a space in the doorframe  1 ; each of the hollow holding portions  32  has a receiving room  33  therein; the connecting panel  31  has several holes  36  thereon, which are faced and in open communication with the receiving rooms  33  of the hollow holding portions  32  respectively; each of the hollow holding portions  32  has two slots  34 , which are formed on a top and a bottom of the hollow holding portion  32  respectively so as to face each other, and which are faced and in open communication with a corresponding said receiving room  33 ; the first holding member  3  further comprises connecting plate members  35 , which are arranged on the top and the bottom of each of the hollow holding portions  32 ; 
         [0017]    (b) a second holding member  4  joined to the door plank  2 , the second holding member  4  has the same shape as the first one  3 , comprising a connecting panel  41  secured on the door plank  2 , and several hollow holding portions  42 , which are arranged one on top of another next to one side of the connecting panel  41 , and which are inserted in a space in the door plank  2 ; each of the hollow holding portions  42  has a receiving room  43  therein; the connecting panel  41  has several holes  46  thereon, which are faced and in open communication with the receiving rooms  43  of the hollow holding portions  42  respectively; each of the hollow holding portions  42  has a slot  44  on each of a top and a bottom thereof, which is faced and in open communication with a corresponding said receiving room  43 ; the second holding member  4  further comprises connecting plate members  45 , which are arranged on the top and the bottom of each of the hollow holding portions  42 ; and 
         [0018]    (c) several hinges  5  pivoting the first and the second holding members  3  and  4  together; the hinges  5  are each partly received in one of the hollow holding portions  32 , and partly received in one of the hollow holding portions  42 ; each of the hinges  5  includes: 
         [0019]    several first swinging bent arms  51 ; each of the first swinging bent arms  51  has a short section  511 , a long section  512 , a first receiving hole  514  on a tail end of the short section  511 , and a second receiving hole  515  on a tail end of the long section  512  thereof; 
         [0020]    several second swinging bent arms  52 ; each of the second swinging bent arms  52  has a short section  521 , a long section  522 , a third receiving hole  524  on a tail end of the short section  521 , and a fourth receiving hole  525  on a tail end of the long section  522 ; in addition, each of the first and the second swinging bent arms  51 ,  52  has a connecting hole  513 ,  523 , which is formed on a joint between the short section  511 ,  521  and the long section  512 ,  522 ; 
         [0021]    the first swinging bent arms  51  are overlapped with and intersect the second swinging bent arms  52  such that all of the connecting holes  513  and  523  are on a straight line; in addition, the first swinging bent arms  51  are arranged such that every two close ones of the connecting holes  513  of the first swinging bent arms  51 , which are close to each other, have one said connecting hole  523  intervening between them; furthermore, the first receiving holes  514  of the first swinging bent arms  51  are on a straight line, the second receiving holes  515  are on a straight line, the third receiving holes  524  of the second swinging bent arms  52  are on a straight line, and the fourth receiving holes  525  are on a straight line; 
         [0022]    a connecting pin  53  passed through the connecting holes  513  and  523  of the first and the second swinging bent arms  51  and  52  to pivot the first and the second swinging bent arms  51  and  52  together; the connecting pin  53  is securely joined to threaded elements  532  at two ends thereof; there are several first ringed pads  531  positioned around the connecting pin  53 , which are each interposed between two said connecting holes  513 ,  523  of the first and the second swinging bent arms  51  and  52 , and passed into one of the corresponding connecting holes  513  and  523  at a small-diameter section thereof; 
         [0023]    a first pivotal pin  54  pivoting the first swinging bent arms  51  to the first holding member  3 ; the first pivotal pin  54  is passed through the first receiving holes  514  of the first swinging bent arms  51 , and securely joined at two ends thereof to the top and the bottom of one said hollow holding portion  32  of the first holding member  3  by means of threaded elements  542 ; there are several second ringed pads  541  positioned around the first pivotal pin  54 , which are each interposed between two adjacent ones of the first receiving holes  514  of the first swinging bent arms  51 , and passed into one of said corresponding first receiving holes  514  at a small-diameter section thereof; 
         [0024]    a first sliding pin  55 , the first sliding pin  55  is passed at two ends thereof into the slots  44  of the top and the bottom of one corresponding said hollow holding portion  42  of the second holding member  4 , and passed through the second receiving holes  515  of the first swinging bent arms  51  so as to serve as a pivot of the first swinging bent arms  51 ; there are several third ringed pads  551  positioned around the first sliding pin  55 , which are each interposed between two adjacent ones of the second receiving holes  515  of the first swinging bent arms  51 , and passed into one of said corresponding second receiving holes  515  at a small-diameter section thereof; furthermore, there are two sliding sleeves  552  provided to the present structure, which are positioned around two ends of the first sliding pin  55  respectively, and received in the slots  44  in a movable manner in order for allowing the long sections  512  of the first swinging bent arms  51  to be moved on the slots  44  together with the first sliding pin  55 ; 
         [0025]    a second pivotal pin  56  pivoting the second swinging bent arms  52  to the second holding member  4 ; the second pivotal pin  56  is passed through the third receiving holes  524  of the second swinging bent arms  52 , and securely joined at two ends thereof to the top and the bottom of a corresponding said hollow holding portion  42  of the second holding member  4  by means of threaded elements  562 ; there are several fourth ringed pads  561  positioned around the second pivotal pin  56 , which are each interposed between two adjacent ones of the third receiving holes  524 , and passed into one of said corresponding third receiving holes  524  at a small-diameter section thereof; 
         [0026]    a second sliding pin  57 , the second sliding pin  57  is passed at two ends thereof into the slots  34  of the top and the bottom of one corresponding said hollow holding portion  32  of the first holding member  3 , and passed through the fourth receiving holes  525  of the second swinging bent arms  52  so as to serve as a pivot of the second swinging bent arms  52 ; there are several fifth ringed pads  571  positioned around the second sliding pin  57 , which are each interposed between two adjacent ones of the fourth receiving holes  525 , and passed into one of said corresponding fourth receiving holes  525  at a small-diameter section thereof; in addition, two sliding sleeves  572  are provided, which are positioned around two ends of the second sliding pin  57  respectively, and received in the slots  34  in a movable manner in order for allowing the long sections  522  of the second swinging bent arms  52  to be moved on the slots  34  together with the second sliding pin  57 . 
         [0027]    Therefore, the door plank  2  is allowed to pivot between an opened position and a closed one, with the first and the second sliding pins  55  and  57  moving on the slots  34  and  44  respectively; shown in  FIG. 4  is a horizontal section of the door plank  2  in an opened position, wherein the first sliding pin  55  is located in front ends of the slots  34  of the corresponding hollow holding portion  32  of the first holding member  3 , which are nearer to the corresponding hole  36  of the connecting panel  31  than rear ends of the slots  34 , and the second sliding pin  57  is located in front ends of the slots  44  of the corresponding hollow holding portion  42  of the second holding member  4 , which are nearer to the corresponding hole  46  of the connecting panel  41  than rear ends of the slots  44 . And, shown in  FIG. 5  is a horizontal section of the door plank  2  in a closed position, wherein the first sliding pin  55  is located in the rear ends of the slots  34 , and the second sliding pin  57  is located in the rear ends of the slots  44  instead; thus, the hinges  5  are hidden within the door plank  2  and the doorframe  1 . 
         [0028]    From the above description, it can be seen that the present invention has the following advantages: 
         [0029]    1. The first and the second pivotal pins are parallel with upright edges of the connecting panels of the first and the second holding members therefore the hinges will be in the correct position for use as soon as the first and the second holding members are inserted in the doorframe and the door plank respectively from the hollow holding portions thereof. In other words, it takes less time and labor to accurately install the hidden type of hinge of the present invention than it does to install the prior art. 
         [0030]    2. The hinge structure is equipped with the ringed pads, which are positioned around the connecting pin, the sliding pins, and the pivotal pins to interpose between the swinging bent arms so as to reduce friction between the swinging bent arms. Therefore, the swinging bent arms of the hinge structure will move relatively smoothly when the door plank is being opened/closed.