Patent Abstract:
The present invention relates to an exercise bar mounted on a door frame, and to an exercise bar mounted on a door frame capable of preventing a user&#39;s face or head from hitting an edge part of an upper end of the door frame when a user bends her or his arms to pull her or his upper body upward and hang her or his chin on a horizontal rod during an exercise such as a chin-up, and in which a height of a pipe member installed at the door frame can be adjusted according to a height of the user.

Full Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims priority to and the benefit of Korean Patent Application No. 2014-0164558, filed on Nov. 24, 2014, the disclosure of which is incorporated herein by reference in its entirety. 
     BACKGROUND 
     1. Field of the Invention 
     The present invention relates to a sports apparatus, and more specifically, to an exercise bar mounted on a door frame that is installed between opposite sides of the door frame in a transverse direction allowing a user to stretch her or his full body and strengthen her or his upper-body muscles. 
     2. Discussion of Related Art 
     Generally, an exercise bar mounted on a door frame which is transversely fixed between opposite sides of the door frame to facilitate indoor chin-ups is known. 
     Such an exercise bar mounted on a door frame may be used for exercises such as chin-ups, and used as a rod for installing a punching bag, a swing for an infant and the like indoors. 
       FIG. 1  is a cross-sectional view of an exercise bar mounted on a door frame according to a conventional technique. As illustrated, the exercise bar mounted on the door frame includes: a hollow pipe member  1 ; a screw member  2  installed in the pipe member  1  in a direction in which the pipe member  1  extends; and length adjusting members  5  connected to both ends of the pipe member  1  through the screw member  2 . Also, the exercise bar mounted on the door frame further includes end caps  6  fixed to the door frame, and the end caps  6  are inserted into opposite end parts of the length adjusting member  5 , thereby preventing a horizontal bar from slipping from the door frame. 
     However, since the exercise bar mounted on the door frame according to the conventional technique is installed inside the door frame, a user may hit an edge part of the upper end of the door frame during a chin-up, and thus there has been a problem of high possibility of injury to a user&#39;s face or head. 
     Also, since a door frame of a typical home at which an exercise bar mounted on a door frame is installed does not have a height at which users who have various physical conditions, especially various heights, can freely exercise, when the exercise bar is installed at a high position for tall users, it is difficult for small users to do chin-ups, and thus there has been a problem in that many users who have various heights cannot control the height of the exercise bar to fit to their height to do chin-ups. 
     (Patent Document 1) Korean Laid-open Patent Application No. 1341253 (Published on Dec. 6, 2013) 
     SUMMARY OF THE INVENTION 
     To solve this problem the present invention provides an exercise bar mounted on a door frame capable of preventing a user&#39;s face or head from hitting an edge part of an upper end of the door frame even when the user pulls her or his upper body upward by bending her or his arms and hangs her or his chin on a horizontal bar during an exercise such as a chin-up. 
     Also, another object of the present invention is to provide an exercise bar mounted on a door frame in which a height of a pipe member installed on a door frame can be adjusted depending on a height of a user. 
     According to an aspect of the present invention, there is provided an exercise bar mounted on a door frame according to a first embodiment of the present invention including hinge members fixed to the door frame, support brackets rotatably installed on the hinge members, and a first pipe fixed between the support brackets in a transverse direction and installed to be supported at a front of the door frame. 
     According to another aspect of the present invention, there is provided an exercise bar mounted on a door frame according to a second embodiment of the present invention including hinge members fixed to the door frame; support brackets rotatably installed on the hinge members; a first pipe fixed between the support brackets in a transverse direction; and a second pipe fixed between the support brackets in a transverse direction and installed to be supported at a front of the door frame. 
     According to still another aspect of the present invention, there is provided an exercise bar mounted on a door frame according to a third embodiment of the present invention including hinge members fixed to the door frame; support brackets rotatably installed on the hinge members and including a plurality of height-adjusting holes; a first pipe fixed between the support brackets in a transverse direction; and a second pipe selectively inserted into the height-adjusting holes and installed to be supported at a front of the door frame. 
     The hinge member may include a circular plate fixed to the door frame; and a support plate provided at a side surface of the circular plate, having a larger diameter than the circular hole of the support bracket into which the circular plate is inserted, and preventing the support bracket from escaping. 
     The support bracket may include a circular hole provided at one side thereof and into which the circular plate of the hinge member is rotatably inserted; and a first pipe fixing hole provided at the other side thereof and into which the first pipe is inserted. 
     The support bracket may include a circular hole provided at one side thereof and into which the circular plate of the hinge member is rotatably inserted; a first pipe fixing hole provided at the other side thereof and into which the first pipe is inserted; and a second pipe fixing hole provided at a lower part between the circular hole and the first pipe fixing hole and into which the second pipe is inserted. 
     The support bracket may include a circular hole provided at one side thereof and into which the circular plate of the hinge member is rotatably inserted; a first pipe fixing hole provided at the other side thereof and into which the first pipe is inserted; and a plurality of height-adjusting holes provided at a lower part between the circular hole and the first pipe fixing hole. 
     A width of the support bracket may be relatively smaller than a width of the circular plate so that the support bracket can be easily rotated with respect to the circular plate without interference from the support plate. 
     The hinge member may be fastened with a fastening member of the support plate at a position at which the fastening member of the support plate does not interfere with the fastening member of the circular plate and the circular plate and the support bracket may be attached to each other by the support plate and are fixed to the door frame. 
     The first pipe fixing hole may include a key groove formed on one side thereof into which a fixing key is inserted and fixed, and the fixing key may have one side surface for insertion in which a flat surface and a slope surface are continuously and repeatedly formed to be inclined upward. 
     According to the exercise bar mounted on the door frame according to the present invention of the above-described configuration, a user can do chin-ups in safety and with correct posture by using the exercise bar mounted on the door frame protruding outward from the door frame. 
     Also, a user can do chin-ups under optimal exercise conditions by adjusting a height of a pipe member depending on a height of the user. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above and other objects, features and advantages of the present invention will become more apparent to those of ordinary skill in the art by describing in detail exemplary embodiments thereof with reference to the accompanying drawings, in which: 
         FIG. 1  is an view illustrating an exercise bar for mount in a door frame according to a conventional technique; 
         FIG. 2  is an exploded perspective view illustrating an exercise bar mounted on a door frame according to a first embodiment of the present invention; 
         FIG. 3  is a cross-sectional view illustrating a hinge member of the exercise bar mounted on the door frame according to first and third embodiments of the present invention; 
         FIG. 4  is an view illustrating the exercise bar mounted on the door frame according to the third embodiment of the present invention; 
         FIG. 5  is an exploded perspective view on an end side of the exercise bar mounted on the door frame according to the third embodiment of the present invention; 
         FIG. 6  is a perspective view illustrating a fixing key for fixing a first pipe of the exercise bar mounted on the door frame according to the first to third embodiments of the present invention to a support bracket; and 
         FIGS. 7 and 8  are operation views illustrating a height control state of the exercise bar mounted on the door frame according to the third embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS 
     Hereafter, embodiments of the present invention will be described in detail with reference to  FIGS. 2 to 8 . 
       FIG. 2  is an exploded perspective view illustrating an exercise bar mounted on a door frame according to a first embodiment of the present invention. 
     The exercise bar mounted on the door frame according to the first embodiment of the present invention, which is fixedly installed to correspond to opposite surfaces of the door frame, includes hinge members  100  fixed to the door frame DF, support brackets  200  rotatably installed on the hinge members  100 , and a first pipe  300  fixed between the support brackets  200  in a transverse direction and installed to be supported at a front of the door frame DF. 
     It is preferable that the first pipe  300  be manufactured to be light-weight and have a minimized circumferential thickness. Further, even if the first pipe  300  is made of a light-weight material, it is possible to have a sufficient strength. 
       FIG. 3  is a cross-sectional view illustrating the hinge member  100  of the exercise bar mounted on the door frame according to the present invention. The hinge member  100  includes a circular plate  110  and a support plate  120 . The circular plate  110  is fixed to the door frame DF through a circular plate fastener  112  such as a screw, and the support plate  120  is provided at a side surface of the circular plate. The support plate  120  is fixed to a side surface of the circular plate  110  through a support plate fastner  122  such as a screw and supports the support bracket  200  to rotate without escaping from the door frame DF. 
     The support bracket  200  includes a circular hole  220  formed on one side thereof and into which the circular plate  110  of the hinge member  100  is inserted, and a first pipe fixing hole  230  formed on the other side thereof and into which the first pipe  300  is inserted. The support bracket  200  is supported on the circular plate  100  to be rotatable. 
     A width of the support bracket  200  is relatively smaller than the width of the circular plate  110  so that the support bracket  200  is easily rotated without interference from the support plate  120  at the time of rotation with respect to the circular plate  110 , and it is preferable that a diameter of the support plate  120  be larger than the diameter of the circular plate  110  and the diameter of the circular hole  220  formed on the support bracket  200 . Therefore, the support bracket  200  is rotatably supported on the hinge member  100  and prevented from escaping from the hinge member  100 . 
     The support plate fastener  122  for the support plate  120  is fastened at a position at which the support plate fastener  122  for the support plate  120  does not interfere with the circular plate fastener  112  for the circular plate  110  so that the circular plate  110  and the support bracket  200  can be attached to each other by the support plate  120  and fixed to the door frame DF, and the support plate  120  includes a head fixing hole  121  into which a head part of the circular plate fastener  112  that is fastened to the circular plate  110  and protrudes outward is inserted. 
     A support plate cover  130  with a cup shape is provided at the outside of the support plate  120  to improve the appearance of the hinge member  100 . 
     The hinge member  100  may be applied to the first to third embodiments of the present invention. 
     According to the exercise bar mounted on the door frame according to the first embodiment of the present invention, the first pipe  300  is inserted into the first pipe fixing holes  230  to be supported at the front of the door frame DF, and thus the first pipe  300  may act as a horizontal bar even with one pipe member. 
     Also, since only the first pipe  300  is installed, installation is easily performed and manufacturing costs and processes are reduced. 
     Hereinafter, as second and third embodiments of the exercise bar mounted on the door frame according to the present invention are described, components having the same configuration and function as in the first embodiment of the present invention will be denoted by the same reference numerals, and the detailed description will be omitted to avoid repeated elements. 
     The exercise bar mounted on the door frame according to the second embodiment of the present invention, which is fixedly installed to correspond to opposite surfaces of the door frame, includes hinge members  100  fixed to the door frame DF, support brackets  200  rotatably installed on the hinge members  100 , a first pipe  300  fixed between the support brackets  200  in a transverse direction, and a second pipe  400  fixed between the support brackets  200  in the transverse direction to be supported at the front of door frame DF. 
     According to the second embodiment of the present invention, when a user grips the first pipe  300  to do chin-ups, the user can do chin-ups in safety and with correct posture by using the exercise bar mounted on the door frame protruding outward from the door frame DF. The exercise bar mounted on the door frame according to the second embodiment of the present invention is configured with a simple structure similar to that of the first embodiment, thereby reducing manufacturing costs and processes. 
     The exercise bar mounted on the door frame according to the third embodiment of the present invention, which is fixedly installed to correspond to opposite surfaces of the door frame, includes hinge members  100  fixed to the door frame DF, support brackets  200  rotatably installed on the hinge members  100  and having a plurality of height-adjusting holes  210 , a first pipe  300  fixed between the support brackets  200  in a transverse direction, and a second pipe  400  selectively inserted into the height-adjusting holes  210  and installed to be supported at a front of the door frame DF. 
     The support bracket  200  includes a plurality of height-adjusting holes  210  formed at a lower part between the circular hole  220  and the first pipe fixing hole  230 . 
     The number of height-adjusting holes  210  may be at least two so that users can exercise under optimal exercise conditions according to their different heights, and may be selectively increased depending on free space of a connection unit  240 . 
     According to the third embodiment of the present invention, when a position of the second pipe  400  inserted into the height-adjusting holes  210  to be fixed is adjusted, a height of the first pipe  300  from the ground is relatively increased or decreased, and thus the height of the pipe member may be adjusted according to the height of the user. 
     Particularly, when a user desires to use the exercise bar mounted on the door frame at a further decreased height of the first pipe  300 , the height may be adjusted to a minimum height in which the first pipe  300  supports the door frame DF, so even a small user may sufficiently use the exercise bar mounted on the door frame. 
       FIG. 6  is a perspective view illustrating a fixing key for fixing the first pipe  300  of the exercise bar mounted on the door frame according to the present invention to the support bracket  200 . A key groove  231  is formed on one side of the first pipe fixing hole  230 . A fixing key  232  is inserted and fixed into the key groove  231  for the first pipe  300  not to be freely rotated in the first pipe fixing hole  230 . The first pipe fixing hole  230  is in the form of an ellipse, one side of which is a little longer than the external diameter of the first pipe  300 . When the first pipe  300  are inserted in the first fixing holes  230  and the fixing keys  232  are inserted and fixed into the key grooves  231 , the outer surface of the first pipe  300  is pressurized by the fixing keys  232 , so the rotation of the first pipe  300  can be prevented. 
     Here, the fixing key  232  has a bar shape having one side on which a grip  232   a  is formed and has one side surface for insertion in which a flat surface and a sloped surface are continuously and repeatedly formed to be inclined upward, thereby improving fastening of the first pipe  300  to the first pipe fixing holes  230  while the fixing key  232  is inserted into the key groove  231 . 
     When the fixing key  232  is fixed to the key groove  231  in a forcible manner while the first pipe  300  is inserted into the first pipe fixing holes  230 , free rotation of the first pipe  300  in the first pipe fixing holes  230  is prevented. 
     Therefore, when the user grips the first pipe  300 , the first pipe  300  is not freely rotated in the first pipe fixing holes  230 , and thus the user can comfortably do chin-ups. 
     The configuration of the key groove  231  and the fixing key  232  may be applied to all of the first to third embodiments of the present invention. 
     Meanwhile, as the operation of the exercise bar mounted on the door frame of the first to third embodiments of the present invention is described, when the exercise bar mounted on the door frame in which a height can be adjusted is installed, firstly, the circular plates  110  of the hinge members  100  are fixed to both sides of the door frame DF, and then the support plates  120  are strongly fixed from the outside of the support brackets  200  while the circular holes  220  of the support brackets  200  corresponding to the circular plates  110  correspond to each other. 
     While the support brackets  200  are fixed to the hinge members  100 , according to the first embodiment, the user strongly fixes the first pipe  300  by inserting the first pipe  300  into the first pipe fixing holes  230  according to her or his height, and inserting the fixing key  232  into the key groove  231 . 
     Next, the first pipe  300  is supported on the front of the door frame DF, and the user does chin-up while gripping the first pipe  300 . 
     In the second embodiment of the present invention, while the circular plates  110  of the hinge members  100  are fixed to opposite sides of the door frame DF and the circular holes  220  of the support brackets  200  corresponding to the circular plates  110  correspond to each other, the support plate  120  is strongly fixed from the outside of the support bracket  200 . 
     While the support brackets  200  are fixed to the hinge members  100 , according to the second embodiment, the first pipe  300  is inserted into the first pipe fixing holes  230 , the fixing key  232  is inserted into the key groove  231  to be strongly fixed, and the second pipe  400  is inserted into a second pipe fixing hole (not shown) to be fixed. 
     Next, the second pipe  400  is supported on the front of the door frame DF, and the user does chin-ups while gripping the first pipe  300 . 
     In the third embodiment of the present invention, while the circular plates  110  are fixed to the hinge members  100  on both sides of the door frame DF and the circular holes  220  of the support brackets  200  corresponding to the circular plates  110  correspond to each other, the support plates  120  are strongly fixed from the outside of the support bracket  200 . 
     While the support brackets  200  are fixed to the hinge members  100 , according to the third embodiment, the user inserts the first pipe  300  into the first pipe fixing holes  230  and inserts the fixing key  232  into the key groove  231  to be strongly fixed, thereby fixing the second pipe  400  to the height-adjusting hole  210  according to the height of the user. Next, the second pipe  400  is supported at the front of the door frame DF, and the user does chin-ups while gripping the first pipe  300 . 
     Next, the second pipe  400  is supported on the front of the door frame DF, and the user does chin-ups while gripping the first pipe  300 . 
       FIGS. 7 and 8  are operation views illustrating a height control state of the exercise bar mounted on the door frame according to the third embodiment of the present invention. When the second pipe  400  inserted and fixed into the height-adjusting hole  210  according to the height of the user is fixed to be adjacent to the first pipe  300 , a relatively small user may use the exercise bar mounted on the door frame ( FIG. 7 ). On the other hand, when the second pipe  400  is fixed to be relatively further from the position of the first pipe  300 , a relatively tall user may use the exercise bar mounted on the door frame ( FIG. 8 ). 
     Therefore, the exercise bar mounted on the door frame can allow the user to do chin-ups under optimal exercise conditions according to her or his height. 
     While exemplary embodiments of the present invention have been described above, the invention is not limited to the aforementioned specific exemplary embodiments. Those skilled in the art may variously modify the invention without departing from the gist of the invention claimed by the appended claims and the modifications are within the protective scope of the claims. 
     DESCRIPTION OF SYMBOL 
       100 : HINGE MEMBER 
       110 : CIRCULAR PLATE 
       120 : SUPPORT PLATE 
       121 : HEAD FIXING HOLE 
       130 : SUPPORT PLATE COVER 
       200 : SUPPORT BRACKET 
       210 : HEIGHT-ADJUSTING HOLE 
       220 : CIRCULAR HOLE 
       230 : FIRST PIPE FIXING HOLE 
       231 : KEY GROOVE 
       232 : FIXING KEY 
       240 : CONNECTION UNIT 
       300 : FIRST PIPE 
       400 : SECOND PIPE

Technology Classification (CPC): 0