Patent Publication Number: US-7219394-B2

Title: Door push bar structure

Description:
FIELD OF THE INVENTION 
   The present invention relates to a door push bar structure, and more particularly to a door push bar structure that could be firmly mounted on a door. 
   BACKGROUND OF THE INVENTION 
     FIG. 1  shows a conventional door push bar structure that is mounted on a door  5  by extending a mounting bolt  4  through a predetermined position on the door  5 , so that an expanded head portion  41  of the mounting bolt  4  is pressed against an outer side of the door  5 ; and connecting two push bars  51 ,  52  to two opposite ends of the mounting bolt  4 . The push bar  51  that is connected to the expanded head portion  41  of the mounting bolt  4  is provided with a stop element  53 , so that the push bars  51 ,  52  are attached to the door  5  at desired positions. A user may then apply a force on the push bar  51  or  52  to open or close the door  5 . 
   However, since the push bars  51 ,  52  are installed on the door  5  simply by screwing the mounting bolt  4  through the door  5  into an end of the other push bar  52 , frequent pull or push of the push bars  51 ,  52  would cause loosening of the push bars  51 ,  52 , particularly the push bar  52 , from the door  5  to result in unstable connection of the push bars  51 ,  52  to the door  5 . Moreover, there doors  5  with different thickness. For a thicker door  5 , a longer mounting bolt  4  is needed to secure firm connection of the push bar  52  to the door  5 . Reversely, for a thinner door  5 , a shorter mounting bolt  4  is sufficient for use. Therefore, many differently sized mounting bolts  4  have to be prepared for mounting the push bars  51 ,  52  on doors  5  with different thickness. This would inevitably result in increased material cost for the mounting bolts  4  as well as inconveniences and confusions to the workers mounting the push bars. 
   SUMMARY OF THE INVENTION 
   A primary object of the present invention is to provide a door push bar structure that could be firmly installed on a door with a mounting mechanism. 
   To achieve the above and other objects, the door push bar structure according to the present invention includes a mounting mechanism having a locking element with a stopper, a sleeve screwed at an end to an end of the locking element, and a locating element pressed against an opposite end of the sleeve, the stopper and the end of the locking element screwed to the sleeve being located in a through hole on a door, and the opposite end of the sleeve being pressed against an outer side of the through hole of the door; and a pair of door push bars consisting of a first and a second push bar, the first push bar being provided at each end surface with a hole for fixedly connecting with an opposite end of the locking element, and the second push bar being provided at each end surface with a horizontal hole for receiving the opposite end of the sleeve therein, and a vertical hole communicating with the horizontal hole for the locating element to extend thereinto to firmly press against the opposite end of the sleeve. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The structure and the technical means adopted by the present invention to achieve the above and other objects can be best understood by referring to the following detailed description of the preferred embodiments and the accompanying drawings, wherein 
       FIG. 1  is a sectional view schematically shows the installation of a conventional door push bar structure on a door; 
       FIG. 2  is a fragmentary, exploded perspective view of a door push bar structure according to the present invention; 
       FIGS. 3 to 7  are fragmentary, sectional views schematically show the installation of the door push bar structure of the present invention on a door having a first thickness; and 
       FIG. 8  shows the installation of the present invention on a different door having a second thickness. 
   

   DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
   Please refer to  FIG. 2  that is a fragmentary, exploded perspective view of a door push bar structure according to the present invention for mounting on a door  1 . As shown, the door push bar structure of the present invention includes a mounting mechanism  2  and a pair of push bars  3  firmly installed on the door  1  via the mounting mechanism  2 . 
   The mounting mechanism  2  is located in a through hole  11  provided on the door  1 , and includes a locking element  21 , a sleeve  22 , and a locating element  23 . The locking element  21  includes a stopper  211 , a first externally threaded section  212  located at one side of the stopper  211 , and a second externally threaded section  213  located at the other side of the stopper  211  opposite to the first threaded section  212 . The sleeve  22  includes an axially extended and internally threaded bore  221  adapted to screw to the first threaded section  212  of the locking element  21 . An end of the sleeve  22  opposite to an open end of the threaded bore  221  forms a tightening head  222  having an outer diameter larger than a diameter of the through hole  11  on the door  1 . The locating element  23  is perpendicularly pressed against one side of the tightening head  222  of the sleeve  22 , so that the first threaded section  212  and the stopper  211  of the locking element  21  and the threaded bore  221  of the sleeve  22  are held in the through hole  11  of the door  1  with the tightening head  222  of the sleeve  22  pressed against an outer side of the through hole  11 . 
   The pair of push bars  3  includes a first and a second push bar  31 ,  32  oppositely installed at two sides of the door  1 . The first push bar  31  is provided at each end with an internally threaded hole  311  adapted to screw to the second threaded section  213  of the locking element  21 . The second push bar  32  is provided at each end with a horizontal hole  321  adapted to receive the tightening head  222  of the sleeve  22  therein. A vertical hole  322  is further provided on the second push bar  32  to communicate with each horizontal hole  321 . The locating element  23  is upward extended into the vertical hole  322  to press against the tightening head  222  of the sleeve  22 . 
     FIGS. 3 to 7  illustrates the manner of installing the door push bar structure of the present invention on the door  1 . Since the two push bars  31 ,  32  are connected at respective upper and lower ends to the door  1  via two sets of the mounting mechanism  2  in the same manner, only the connection of the upper ends of these two push bars  31 ,  32  to the door  1  is described herein. To mount the door push bar structure of the present invention on the door  1 , first screw the second threaded section  213  of the locking element  21  of the mounting mechanism  2  into the internally threaded hole  311  on the upper end of the first push bar  31  until the stopper  211  of the locking element  21  is firmly pressed against an outer side of the threaded hole  311 , as shown in  FIG. 3 . As can be seen from the drawings, the stopper  211  has an outer diameter smaller than the through hole  11  and larger than the internally threaded hole  311 , and can therefore be located in the through hole  11 . Then, extend the first threaded section  212  of the locking element  21  into the through hole  11  via one side of the door  1 , and extend the end of the sleeve  22  with the threaded bore  221  into the through hole  11  via the other side of the door  1  to engage the threaded bore  221  of the sleeve  22  with the first threaded section  212  of the locking element  21  until the diametrically larger tightening head  222  of the sleeve  22  is pressed against an outer side of the through hole  11 , as shown in  FIGS. 4 and 5 . Thereafter, align and connect the horizontal hole  321  on the second push bar  32  with the tightening head  222  of the sleeve  22 , and screw the locating element  23  into the horizontal hole  321  via the vertical hole  322  to press against the tightening head  222  of the sleeve  22  received in the horizontal hole  321 , as shown in  FIGS. 6 and 7 . By doing so, the pair of push bars  3  is firmly connected to the door  1  via the mounting mechanism  2 . 
   It is noted the mounting mechanism  2  may be used with doors of different materials and thickness.  FIG. 8  shows the door push bar structure of the present invention is installed on a door  1   a  having a thickness smaller than that of the door  1  shown in  FIG. 3 to 7 . To mount the door push bar structure  3  on a thinner door  1   a , a user needs only to adjust a travel by which the internally threaded bore  221  of the sleeve  22  is screwed to the first threaded section  212  of the locking element  21 . That is, the screwing travel is shorter for the door  1  that has a larger thickness, and longer for the door  1   a  that has a smaller thickness. 
   The invention being 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 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.