Description DOOR HINGE

Technical Field

[1] The present invention relates to a door hinge having an angled configuration, and more particularly, to a door hinge having an angled configuration suitable for use with a variety of door and doorframe designs intended to achieve satisfactory soundproofing and fireproofing effects, the door hinge having a feature of preventing generation of noise when a door is opened or closed. Background Art

[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.

[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.

[7] Meanwhile, in the case where a door and doorframe have a double-angled coupling structure, the number of hinge mounting recesses in the door and doorframe should be increased. This has many problems of causing an unpleasant external appearance and increasing manufacturing costs of the hinge caused by cutting and machining of the mounting recesses. Disclosure of Invention Technical Problem

[8] 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 having an angled configuration suitable for use with soundproof and fireproof doors having angled portions.

[9] It is another object of the present invention to provide a door hinge having an angled configuration for use with a variety of doorframe and door designs intended to achieve satisfactory soundproofing and fireproof ing effects, the door hinge being capable of preventing generation of noise when a door is opened or closed.

[10] It is a further object of the present invention to provide a door hinge having an angled configuration, which can achieve a sufficient structural integrity to support even a heavy door while preventing generation of noise when a door is opened or closed.

[11] It is a still another object of the present invention to provide a door hinge having an angled configuration, which can achieve a large mounting area in relation to a door and/or door frame. Technical Solution

[12] In accordance with the present invention, the above and other objects can be accomplished by the provision of a door hinge having an angled configuration comprising: an inner door bracket having a center angled portion, and a positioning pole integrally formed at an end thereof with a spacer; and an outer door bracket having a center angled portion, a receiving opening to allow the inner door bracket to be inserted therein, and a reinforcing pole having a rotation-allowance opening, wherein the inner and outer door brackets are installed to a door and doorframe, respectively, after being coupled with each other via fitting of a shaft pin and ring- shaped bushings.

[13] Preferably, the inner and outer door brackets have a plurality of fastening holes perforated therein, and each fastening hole is formed with spikes along an edge thereof that will come into close contact with the door or doorframe. As a result, the door hinge does not require separate hinge mounting recesses in the door and doorframe.

[14] Preferably, the positioning pole has an approximately L-shaped form, and is disposed on a corner surface of the door or doorframe.

Advantageous Effects

[15] The present invention provides a door hinge, which can be easily installed to a door and doorframe without separate mounting recesses in the door and doorframe. The door hinge of the present invention is applicable to all kinds of doors including fireproof and soundproof doors, wooden and metallic doors, and general room and office doors. In particular, when being used in special doors such as fireproof and soundproof doors or other doors and doorframes having an angled configuration, the door hinge of the present invention can achieve an outstanding mounting efficiency.

[16] In addition, according to the present invention, as a result of allowing a positioning hole and reinforcing hole provided at inner and outer door brackets of the door hinge to come into close contact with corner surfaces of a door and doorframe so as to conceal junctions with respect to shaft pin connecting portions of the inner and outer door brackets from view, the door hinge can achieve an aesthetically pleasing external appearance. In conclusion, the present invention is of utmost utility in the construction industry. Brief Description of the Drawings

[17] The 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:

[18] FIG. 1 is a perspective view illustrating a door hinge having an angled configuration according to a preferred embodiment of the present invention;

[19] FIG. 2 is an exploded perspective view of the door hinge shown in FIG. 1;

[20] FIG. 3 is a sectional view illustrating a state wherein the door hinge shown in FIG.

1 is installed to a door and door frame;

[21] FIG. 4 is a perspective view illustrating a door hinge having an angled configuration according to another embodiment of the present invention;

[22] FIG. 5 is a sectional view illustrating a state wherein the door hinge shown in FIG.

4 is installed to a door and door frame;

[23] FIG. 6 is a sectional view of the door hinge shown in FIG. 4;

[24] FIG. 7 is a perspective view illustrating a folded state of a door hinge having an angled configuration according to a still another embodiment of the present invention;

[25] FIG. 8 is a perspective view illustrating a spread state of the door hinge shown in

FIG. 7; and

[26] FIG. 9 is a sectional view of the door hinge shown in FIG. 7.

Best Mode for Carrying Out the Invention

[27] Now, a door hinge according to preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The door hinge according to the present invention has a feature of not requiring hinge mounting recesses in a door and doorframe.

[28] As shown in FIGS. 1 to 9, the door hinge according to the present invention includes a door bracket and a doorframe bracket, which are integrally coupled with each other to achieve a strength sufficient to withstand the weight of a door upon opening and closing operations of the door. Hereinafter, the door bracket is referred to as an inner door bracket, and the doorframe bracket is referred to as an outer door bracket. The door hinge according to the present invention can be installed to a door and doorframe without requiring hinge mounting recesses in the door and doorframe, and in particular, be efficiently used in soundproof and fireproof doors.

[29] Referring to FIGS. 1 to 3 illustrating an embodiment of the present invention, the door hinge of the present embodiment includes the inner door bracket 90 and the outer door bracket 100, which are installed to a door and doorframe. For this, a shaft pin 20, caps 10, and ring-shaped bushings 10-1 are assembled with the inner and outer door brackets 90 and 100. The inner door bracket 90 has a center angled portion 70, and a positioning pole 30 integrally formed at an end thereof with a spacer 30-1 and having an approximately L-shaped form. The outer door bracket 100 has a center angled portion 80, a receiving opening 40 to allow the inner door bracket 90 to be inserted therein, and a reinforcing pole 60 having a rotation-allowance opening 60-1.

[30] The inner and outer door brackets 90 and 100 also have cylindrical shaft pin connecting portions, through which the shaft pin 20 is closely inserted. Also, the center angled portions 70 and 80 are intended to be engaged with angled portions of the door and doorframe, respectively.

[31] To assemble the inner and outer door brackets 90 and 100, a shaft pin 20, and ring- shaped bushings 10-1 with one another, the shaft pin 20 is inserted through the shaft pin connecting portions of the inner and outer door brackets 90 and 100 such that the ring-shaped bushings 10-1 are interposed between the shaft pin connecting portion of the inner door bracket 90 and the upper and lower shaft pin connecting portions of the outer door bracket 100.

[32] As a result of coupling the inner and outer door brackets 90 and 100 with each other about the shaft pin 20 by interposing the ring-shaped bushings 10-1 at junctions between the inner and outer door brackets 90 and 100, the above described configuration has an effect of attenuating the generation of frictional force and consequently, the risk of abrasion.

[33] The positioning pole 30 of the inner door bracket 90 is configured in such a manner that the positioning pole 30 has the same length as the shaft pin 20 and upper and

lower portions of the positioning pole 30, protruding upward and downward from the remaining portion of the inner door bracket 90, come into contact with the outer door bracket 100 after the inner and outer door brackets 90 and 100 are completely coupled with each other. Once the door hinge of the present invention is installed to the door and doorframe, the positioning pole 30 comes into close contact with a corner surface of the door. As a result, the inner door bracket 90 can be installed to come into close contact with the door without a separate mounting position setting operation. Also, the angled portion 70 can be located at a corresponding angled portion of the door.

[34] The present invention is based on the assumption that the door and doorframe for use with the door hinge according to the present invention have angled portions to increase soundproofing and fireproofing effects thereof to the maximum extent.

[35] With the above-described configuration according to the present invention, the inner and outer door brackets 90 and 100 of the door hinge can be easily installed to the door and doorframe as the positioning pole 30 of the inner door bracket 90 comes into close contact with the corner surface of the door without any difficulty related to precisely setting bracket installation positions and determining the protruding degree of the shaft pin.

[36] Accordingly, the door hinge, having the above-described configuration according to the present invention, can achieve not only an aesthetically pleasing external appearance of an installation portion thereof, but also a firm and stable coupling surface as a result of concealing a support of the shaft pin from view. In addition, the door hinge can enhance a structural integrity by virtue of an enlarged supporting area between the inner door bracket 90 and the corner surface of the door.

[37] The reinforcing pole 60 of the outer door bracket 100 is configured in such a manner that the reinforcing pole 60 has the same length as the shaft pin 20 to continuously extend vertically and defines the rotation-allowance opening 60- 1 at a portion thereof in contact with the inner door bracket 90.

[38] With the above described configuration, when the outer door bracket 100 is installed to the doorframe, the reinforcing pole 60 can come into close contact with the doorframe so as to conceal the shaft pin 20 from view, thereby achieving an aesthetically pleasing external appearance.

[39] As will be understood from FIG. 2 illustrating an exploded perspective view of the door hinge which does not require mounting recesses in the door and doorframe according to the present invention, the inner door bracket 90 features that it has the spacer 30- 1 formed by cutting and the cylindrical shaft pin connecting portion for insertion of the shaft pin 20, and the outer door bracket 100 features that it has the receiving opening 40 and the rotation- allowance opening 60-1 of the reinforcing pole 60 is formed after forming the shaft pin connecting portion.

[40] Referring to FIG. 3 illustrating the door hinge installed to the door and doorframe, the door hinge according to the present invention features the positioning pole 30 and reinforcing pole 60, which come into close contact with corner surfaces of the door and doorframe when the inner and outer door brackets 90 and 100 are installed to the door and doorframe without requiring mounting recesses in the door and doorframe.

[41] Although one embodiment of the present invention has been described above, it will be understood that various alternations and modifications are possible according to various patterns and shapes of the door hinge.

[42] FIGS. 4 to 6 illustrate a door hinge according to another embodiment of the present invention, which does not require mounting recesses in a door and doorframe. The door hinge of the present embodiment features spikes 120 formed at a plurality of fastening holes 50 perforated in the inner and outer door brackets 90 and 100 along an inner periphery of each hole 50 that will come into close contact with the door or doorframe. Here, the fastening holes 50 are used to attach the door hinge to the door and doorframe as fasteners 50- 1 are inserted therethrough. In addition, additional spikes 110 are formed at distal ends of the inner and outer door brackets 90 and 100 opposite to the shaft pin connecting portions. As the spikes 120 and 110 of the inner and outer door brackets 90 and 100 are embedded into the door and doorframe, the present embodiment has the effect of allowing the door hinge to be easily installed to the door and doorframe and preventing the installed door hinge from being unintentionally separated from the door and doorframe.

[43] In the present invention, the door hinge can be manufactured in various shapes via integral extrusion or injection molding, and can also be formed of metallic or nonmetallic materials.

[44] FIGS. 7 to 9 illustrate a door hinge according to a still another embodiment of the present invention, which does not require mounting recesses in a door and doorframe. The door hinge of the present embodiment features the inner and outer door brackets thereof, which are provided with an extended portion and a dented seating portion, respectively, to enlarge an installation area of the door hinge in relation to the door.

[45] More specifically, the inner door bracket 90 has an extended portion 90-1 provided at a distal end portion thereof. As a result of providing the fastening holes 50 for insertion of the fasteners 50-1 at the extended portion 90-1, the extended portion 90-1 has the effect of increasing a distance between the fasteners 50-1 inserted through the fastening holes 50, thereby enlarging a coupling area thereof.

[46] The outer door bracket 100 has a dented seating portion 100-1 for allowing the extended portion 90- 1 of the inner door bracket 90 to be seated therein.

[47] With the above described configuration, the inner door bracket 90 can achieve an enlarged mounting area and consequently, a greatly increased coupling force, thereby

allowing the resulting door hinge to withstand even a heavy door.

[48] Although the preferred embodiment of the present invention has 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.

[49]