Description DOOR HINGE

Technical Field

[1] The present invention relates to a door hinge, and more particularly, to a door hinge having a high coupling intensity with respect to a door and doorframe.

[2] A Hinge is an essential component of fireproof doors as well as general doors, and various designs of hinges are being developed in consideration of configurations and functions of such doors. Background Art

[3] As one example of the prior art, Korean Paten Publication No. 292540 discloses a hinge including: a U-shaped steel-made doorframe piece to be installed to a doorframe; a steel-made door piece to be installed to a door, the door piece being configured to be inserted into an opening of the U-shaped doorframe piece; cylindrical shaft connecting portions formed at facing ends of the door and doorframe pieces and pivotally rotatably connected with each other by means of a shaft pin inserted therethrough; a plurality of screw holes perforated in the door and doorframe coupling pieces; positioning protrusions provided at upper and lower positions of the door and doorframe coupling pieces adjacent to the shaft connecting portions thereof and configured to be caught by outer surfaces of the door and door frame; and hinge caps press-fitted into the upper and lower shaft connecting portions of the doorframe piece.

[4] Also, as another example of the prior art, Korean Utility Model Application No.

2005-0018169 discloses a door hinge having a stopper to limit the opening degree of a door. In the door hinge disclosed in the above Application, stopper protrusions for limiting the opening degree of a door are formed at outer circumferences of first and second bushings, which are fitted around a shaft pin and located between upper and lower shaft bores of a doorframe bracket and upper and lower ends of a shaft bore of a door bracket. The disclosed door hinge has the effect of preventing a door knob from colliding with a wall.

[5] Although the disclosed conventional hinge has an advantageous configuration capable of limiting the opening degree of a door, it does not achieve a sufficient structural integrity to withstand a heavy door and generates noise when the door is opened or closed.

[6] Furthermore, to install the conventional hinge, it is necessary to form hinge mounting recesses in a door and doorframe by cutting or other machining operations. Also, the hinge mounting recesses of the door and doorframe may cause a decline in the material strength of the door and doorframe since they are easily damaged or worn.

Disclosure of Invention

Technical Problem

[7] Therefore, the present invention has been made in view of the above problems, and it is an object of the present invention to provide a door hinge featuring a convenient installation operation.

[8] It is another object of the present invention to provide a door hinge capable of enabling easy opening and closing operations of a heavy door.

[9] It is a further object of the present invention to provide a door hinge, which does not require hinge mounting recesses in a door and doorframe, and, in particular, has a three-part configuration capable of supporting a heavy door. Technical Solution

[10] In accordance with the present invention, the above and other objects can be accomplished by the provision of a door hinge comprising: a first doorframe bracket having an opening perforated therein; a door bracket configured to be inserted into the opening of the first doorframe bracket, the door bracket having an opening perforated therein; and a second doorframe bracket configured to be inserted into the opening of the door bracket, wherein the door bracket and first and second doorframe brackets are installed to a door and doorframe, respectively, after being coupled with one another by fitting a shaft pin and ring-shaped bushings through shaft connecting portions of the brackets, to form a linear door hinge configuration.

[11] Preferably, the door hinge has an angled configuration formed with a central angled portion.

[12] Preferably, the first doorframe bracket and the door bracket are formed at their distal end portions with a dented seating portion and an extended seating portion, respectively, such that the extended seating portion and the dented seating portion overlap each other.

[13] Preferably, the door bracket and first and second doorframe brackets are axially provided with reinforcing poles.

[14] Preferably, the door bracket and first and second doorframe brackets have a plurality of fastening holes perforated therein, and each fastening hole is formed with spikes or a protruding pin along an edge thereof that will come into close contact with the door or doorframe, to enhance a coupling force of the door hinge with respect to the door and doorframe.

[15] Preferably, each of the door bracket and first doorframe bracket has triangular protruding pins arranged at a distal end thereof, to enhance a coupling force of the door hinge with respect to the door and doorframe.

Advantageous Effects

[16] As apparent from the above description, the present invention provides a door hinge having the following effects.

[17] Firstly, the door hinge according to the present invention has a three-part configuration consisting of a door bracket and first and second doorframe brackets. The door bracket and first and second doorframe brackets are coupled with each other to achieve a compact overall configuration sufficient to be received in a gap between a door and a doorframe.

[18] Secondly, according to the present invention, the three-part type door hinge is provided with reinforcing poles at particular positions thereof which will come into contact with a door and doorframe when the door hinge is installed to the door and doorframe. With this configuration, the door hinge can achieve the effects of simplified and convenient mounting thereof and an aesthetically pleasing external appearance by concealing junctions thereof in relation to the door and door frame from view.

[19] Thirdly, with the provision of triangular protruding pins and spikes, which are formed at the brackets of the door hinge so as to be embedded into the door and doorframe when the door hinge is installed to the door and doorframe, the door hinge according to the present invention can achieve an enhanced supporting intensity with respect to the door and doorframe. In conclusion, the present invention is of utmost utility in the construction industry. Brief Description of the Drawings

[20] he above and other objects, features and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:

[21] FIG. 1 is a perspective view illustrating a door hinge according to a preferred embodiment of the present invention;

[22] FIG. 2 is a perspective view illustrating three-part configuration of the door hinge according to the present invention;

[23] FIG. 3 is a perspective view illustrating an overlapped configuration of the door hinge according to the present invention;

[24] FIG. 4 is a sectional view of the door hinge shown in FIG. 1 installed to a door and doorframe;

[25] FIG. 5 is a perspective view illustrating a door hinge having an angled configuration according to another embodiment of the present invention;

[26] FIGS. 6 A and 6B are perspective views illustrating operation of the door hinge shown in FIG. 5;

[27] FIG. 7 is a sectional view of the door hinge shown in FIG. 5 installed to a door and doorframe;

[28] FIG. 8 is a perspective view illustrating a door hinge according to a further embodiment of the present invention;

[29] FIG. 9 is a perspective view of the door hinge shown in FIG. 8;

[30] FIG. 10 is a front view illustrating a door hinge having reinforcing poles according to a still further embodiment of the present invention; [31] FIG. 11 is a front view of the door hinge shown in FIG. 10;

[32] FIG. 12 is a perspective view illustrating a door hinge having an angled overlapping configuration and reinforcing poles according to a still further embodiment of the present invention;

[33] FIG. 13 is a perspective view of the door hinge shown in FIG. 12;

[34] FIG. 14 is a perspective view illustrating a punched door hinge according to a still further embodiment of the present invention;

[35] FIG. 15 is a perspective view of the door hinge shown in FIG. 14;

[36] FIG. 16 is a perspective view illustrating a door hinge using fitting pins according to a still further embodiment of the present invention; [37] FIG. 17 is a perspective view illustrating a door hinge using detachable reinforcing poles according to a still further embodiment of the present invention; [38] FIG. 18 is a perspective view illustrating a door hinge having triangular pins formed at brackets according to a still further embodiment of the present invention; [39] FIG. 19 is a perspective view of the door hinge shown in FIG. 18;

[40] FIG. 20 is a perspective view illustrating a door hinge having spikes formed at each fastening hole according to a still further embodiment of the present invention; [41] FIG. 21 is a perspective view illustrating a door hinge having a ring-shaped protruding pin formed at each fastening hole according to a still further embodiment of the present invention; [42] FIG. 22 is a sectional view illustrating a door hinge having reinforcing pads according to a still further embodiment of the present invention; [43] FIG. 23 is a sectional view illustrating an alternative angled configuration of the door hinge shown in FIG. 22; [44] FIG. 24 is a perspective view illustrating a door hinge using ring bearings provided at a shaft fitting portion according to a still further embodiment of the present invention; [45] FIG. 25 is a perspective view of the door hinge shown in FIG. 24;

[46] FIG. 26 is a perspective view illustrating a door hinge having a reinforcing pole attached to a doorframe bracket according to a still further embodiment of the present invention;

[47] FIG. 27 is a perspective view of the door hinge shown in FIG. 26;

[48]

Best Mode for Carrying Out the Invention

[49] Now, a door hinge according to preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[50] As shown in FIGS. 1 to 4, the door hinge according to the present invention, which is designated by reference numeral 180, is configured in such a manner that three parts are assembled with one another by means of a shaft 40, shaft pin and ring-shaped bus hings to have a linear configuration. Here, the three parts include a first doorframe bracket 50 having an opening 10, a door bracket 70 configured to be inserted into the opening 10 of the first doorframe bracket 50, the door bracket 70 having an opening 30, and a second doorframe bracket 60 configured to be inserted into the opening 30 of the door bracket 70.

[51] The above-described door hinge 180 according to the present invention features the first and second doorframe brackets 50 and 60, which are partially subjected to rolling to define a cylindrical space for fitting of the shaft 40. Of course, the door bracket 70 is also partially subjected to rolling such that the shaft is fitted through the rolled end portion of the door bracket 70.

[52] The door bracket 70 is seated in the opening 10 of the first doorframe bracket 50 and, in turn, the second doorframe bracket 60 is seated in the opening 30 of the door bracket 70.

[53] Referring to FIG. 4, the door hinge 180 is installed to a door 200 and a doorframe

190 as fasteners 100 are inserted through fastening holes 20 perforated in the door bracket 70 and first and second doorframe brackets 50 and 60. As compared to a conventional door hinge 230 shown in FIG. 30 which requires hinge mounting recesses 220 formed in the door 200 and doorframe 190, the door hinge 180 having the above- described configuration according to the present invention can be installed, in a simplified manner, to the door 200 and doorframe 190 without the hinge mounting recesses. Moreover, the door hinge 180 according to the present invention can be sufficiently interposed in a gap 210 between the door 200 and the doorframe 190.

[54] With the above-described three-part configuration of the door hinge according to the present invention, the outermost first doorframe bracket 50, the middle door bracket 70, and the innermost second doorframe bracket 60 are engaged with one another such that the door bracket 70 installed to the door 190 is interposed between the first and second doorframe brackets 50 and 60 installed to the doorframe 190. This engagement configuration has the effect of greatly reducing the risk of unwanted separation between the brackets 50, 60, and 70.

[55] FIGS. 5, 6A, and 6B illustrate a door hinge having an angled configuration according to another embodiment of the present invention. The door hinge of the present

embodiment is devised to be used with a door and doorframe having an angled portion.

[56] In the present embodiment, the first doorframe bracket 50 has an angled portion

50-1, and the door bracket 70 has an angled portion 70-1, such that the angled portions 50- 1 and 70- 1 are mounted at corresponding angled portions of the door 200 and doorframe 190. In this case, the second doorframe bracket 50 may have a linear configuration to be mounted at a corner surface of the doorframe 190, or may have an angled configuration if necessary.

[57] Referring to FIGS. 8 and 9 illustrating a door hinge according to a further embodiment of the present invention, the door bracket 70 is larger than the opening 10 of the first doorframe bracket 50 so as to achieve an enlarged coupling area with respect to the door. For this, the door bracket 70 has an extended seating portion 140-1.

[58] Also, the first doorframe bracket 50 has a dented seating portion 140 to receive the extended seating portion 140-1 of the door bracket 70.

[59] Referring to FIGS. 10 to 13 illustrating a still further embodiment of the present invention, the first doorframe bracket 50 is formed with a reinforcing pole 90, and the door bracket 70 is formed with a reinforcing pole 80.

[60] Specifically, each of the first doorframe bracket 50 and door bracket 70 is first subjected to cutting for forming the reinforcing pole 90 or 80, and then, subjected to rolling for forming a cylindrical shaft fitting space for fitting of the shaft 40. The reinforcing pole 90 or 80 is located at a distal end of the rolled end portion of the first doorframe bracket 50 or door bracket 70, and will comes into close contact with a corner surface of the door 200 or doorframe 190 so as to conceal a coupling junction with respect to the door 200 or doorframe 190 from view. In particular, when the first doorframe bracket 50 and door bracket 70 have an angled configuration, as shown in FIG. 7 in sectional view, the resulting door hinge, which generally has a linear configuration, can be installed to angled portions of the door and doorframe.

[61] The dented seating portion 140 and the extended seating portion 140-1 can be employed together with the reinforcing poles 90 and 80.

[62] FIGS. 14 and 15 illustrate a door hinge according to a still further embodiment of the present invention, which has protrusions 130. The protrusions 130 are used to allow a user to easily recognize particular surfaces of the door bracket 70 and first and second doorframe brackets 50 and 60 which will come into contact with the door and doorframe, thereby contributing to easy installation of the door hinge. The protrusions are formed, by punching, throughout the first and second doorframe brackets 50 and 60 and door bracket 70.

[63] Referring to FIG. 16, as another means for representing the surfaces of the door bracket 70 and first and second doorframe brackets 50 and 60 which will come into contact with the door and doorframe, the door bracket 70 and first and second

doorframe brackets 50 and 60 are formed with fitting recesses 110 such that fitting pins 120 are inserted into the respective fitting recesses 110.

[64] Referring to FIG. 17 illustrating a still further embodiment of the present invention, to detachably couple reinforcing pole 150 to the door bracket and first and second doorframe brackets, each reinforcing pole 150 is formed with protrusions 140, and the door bracket and first and second doorframe brackets are formed with fitting recesses 160.

[65] With the above-described configurations, the door hinge can assure not only convenient assembly thereof, but also easy modification in shape and size.

[66] FIGS. 18 and 19 illustrate a door hinge having triangular protruding pins according to a still further embodiment of the present invention.

[67] The first doorframe bracket 50 is formed at a surface thereof with triangular protruding pins 170 by punching, such that the triangular protruding pins 170 are embedded into the doorframe. Also, the door bracket 70 is formed with triangular protruding pins 170 such that the triangular protruding pins 170 are embedded into the door.

[68] Referring to FIG. 20, the door bracket 70 and first and second doorframe brackets 50 and 60 are perforated with fastening holes, and each fastening hole is formed, along an edge thereof that will come into contact with the door or doorframe, with spikes 240. As the spikes 240 are embedded into the door and doorframe, the resulting door hinge has the effect of being more easily installed to the door and doorframe and eliminating the risk of unintentional separation from the door and doorframe.

[69] The above-described triangular protruding pins 170 and spikes 240, which will be embedded into the door and doorframe, also can serve to increase fastening force of the door hinge obtained by fasteners, thereby allowing the door bracket 70 and first and second doorframe brackets 50 and 60 to be more stably and strongly installed to the door and doorframe.

[70] Referring to FIG. 21, the door bracket 70 and first and second doorframe brackets 50 and 60 are formed, around each of the fastening holes, with a ring-shaped protruding pin 240-1, to increase a fastening force of the door hinge with respect to the door and doorframe.

[71] As a plurality of ring-shaped protruding pins 240- 1 are embedded into the door and doorframe, they can efficiently increase fastening force obtained by fasteners, thereby allowing the door bracket 70 and first and second doorframe brackets 50 and 60 to be more stably and strongly installed to the door and doorframe.

[72] FIGS. 22 and 23 illustrate reinforcing pads 250 provided at the door hinge, to increase a coupling intensity of the door hinge with respect to the door and doorframe. The use of the reinforcing pads 250 is effective when the door hinge is used with an

iron structure. To attach the reinforcing pads 250 to the door hinge, the fasteners 100 are fitted through the reinforcing pads 250 and brackets of the door hinge.

[73] FIGS. 24 and 25 illustrate ring bearings 40-1, which are interposed between the respective adjacent shaft connecting portions of the brackets. The ring bearings 40-1 provided between the shaft connecting portions of the brackets have the effect of reducing wear of the resulting frictional contact areas of the brackets and assuring smooth operation of the door hinge.

[74] FIGS. 26 and 27 illustrate an alternative embodiment of the above-described reinforcing bar 90. In the present embodiment, the reinforcing bar 90 has protrusions 90- 1 arranged by a predetermined interval. Although not shown, the first doorframe bracket 50 is formed with corresponding fitting recesses for fitting of the reinforcing bar 90. The reinforcing bar 90 is fitted into and fixed to the first doorframe bracket 50 before the first doorframe bracket 50 is subjected to rolling to define the shaft fitting space.

[75] Similarly, the door bracket 70 is formed with fitting recesses 80-2 such that the reinforcing pole 80 having protrusions 80-1 is fitted into and fixed to the door bracket 70 before the door bracket 70 is subjected to rolling to define the shaft fitting space.

[76] With the above-described coupling manner, a desired size and shape of the reinforcing pole can be assembled to the door hinge in a more simplified manner.

[77] Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, these embodiments are merely provided by way of examples, and the present invention is applicable to linear or angled door hinges, and those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.