DOOR UNIT

TECHNICAL FIELD The present invention related to a door unit, and more particularly, to a door unit that includes a door having a reinforcing plate, thereby preventing a tool from being inserted between a door frame and the door or protecting a locking element of the door even when a tool is inserted between the door frame and the door.

BACKGROUND ART

Generally, referring to FIGS. 1 through 3, a door unit 110 includes a door 120, a locking element 130, and a door knob 140. The door 120 is hinged to a door frame 11 so as to be opened or closed. The door 120 includes an inside plate 121 facing an indoor area, an outside plate 122 facing an outdoor area, and a lateral plate 123 connecting the inside plate 121 to the outside plate 122.

The locking element 130 is installed inside the door 120 so as to lock/unlock the door 120 in the door frame 11. The locking element 130 includes a case 131 and latch elements 132 that move in and out from a side surface of the case 131.

The door knob 140 is installed on the inside plate 121 of the door 120, and is connected to the locking element 130 so as to control the latch elements 132 to move in and out. Generally, as a lever (not shown) of the door knob 140 rotates, the latch elements 132 that are mechanically connected to the lever are moved towards the door frame 11.

As illustrated in FIG. 3, in the door unit 110, an interval D exists between the door 120 and the door frame 11. In a common method to break into a house having the door

120 by using a tool (e.g., a pincer 170 or the like) used for extracting big nails is inserted between the door 120 and the door frame 11 and then the space between the door 120 and the door frame 11 is widened using the tool so that the latch elements 132 that are fixed to the door frame 11 come out from the door frame 11. As such, the latch elements 132 are separated from the door frame 11 , and a burglar can easily break into house.

The burglar can easily break down the door 120 using the pincer 170 because the interval D exists between the door 120 and the door frame 11.

In addition, when the tool, such as the pincer 170, is inserted between the door 120 and the door frame 11 , the side surface of the case 131 , with respect to which the latch

elements 132 move in and out, can be easily curved and broken by the pincer 170.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 illustrates a conventional door unit; FIG. 2 is a side view of the door unit of FIG. 1 ;

FIG. 3 illustrates a case where a tool is inserted between the door and a doorframe illustrated in FIG. 1 ;

FIG. 4 is a perspective view of a door unit according to an embodiment of the present invention; FIG. 5 is a side view of the door unit of FIG. 4;

FIG. 6 illustrates a door unit according to anther embodiment of the present invention;

FIG. 7 is a perspective view of a reinforcing plate of a door unit according to anther embodiment of the present invention; and FIG. 8 is a perspective view of a door unit including a reinforcing plate, according to another embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL PROBLEM

To solve the above and/or other problems, the present invention provides a door unit which can prevent a tool such as a pincer, etc., from being inserted between a door and a door frame and can also prevent a side surface of a case from being easily curved or destroyed even when a tool is inserted between the door and door frame.

TECHNICAL SOLUTION

According to an aspect of the present invention, there is provided a door unit comprising a door which is hinged to a door frame and formed of iron, the door including an inside plate facing an indoor room, an outdoor plate facing an outdoor room and a lateral plate formed of iron and connecting the inside plate to the outside plate ; a locking element installed inside the door and including a case and latch elements that move in and out from a side surface of the case so as to lock/unlock the door in the door frame; and a door knob installed on the inside plate of the door and connected to the locking

element so as to control the latch elements to move in and out through holes in the case, and a reinforcing plate to be fixed to the door via rivets and which covers the side surface of the case and .

The reinforcing unit may be formed of a harder material than the side surface of the case.

The reinforcing plate may include an inside plate contact portion in contact with the inside plate of the door.

The door knob may have a rotation shaft connected to the latch elements, and a via hole through which the rotation shaft passes may be formed in the inside plate contact portion of the reinforcing plate.

ADVANTAGEOUS EFFECTS

According to embodiments of the present invention, a reinforcing plate is coupled to a door so that a burglar cannot open the door by using a pincer.

DESCRIPTION OF THE DRAWINGS

BEST MODE

Hereinafter, the present invention will be described in detail by explaining exemplary embodiments of the invention with reference to the attached drawings.

FIG. 4 is a perspective view of a door unit 10 according to an embodiment of the present invention. FIG. 5 is side view of the door unit 10 of FIG. 4.

A conventional door unit may be used in conjunction with the door unit 10. In particular, the door unit 10 includes a door 20, a locking element 30, a door knob 40, and a reinforcing plate 50.

The door 20 also includes an inside plate 21 facing an indoor room, an outside plate 22 facing an outdoor room, and a lateral plate 23 connecting the inside plate 21 to the outside plate 22. Overall, the door 20 is formed of iron. In addition, a separate reinforcing member for reinforcing the lateral plate 23 may be vertically installed on the inner surface of the lateral plate 23.

The locking element 30 is installed inside the door 20 so as to lock/unlock the door 20 in the doorframe 11. The locking element 30 includes a case 31 and latch elements 32 that move in and out from a side surface of the case 31.

The door knob 40 is installed on the inside plate 21 of the door 20, and is connected to the locking element 30 so as to control the latch elements 32 to move in and out. As illustrated in FIG. 4, the door knob 40 is also installed on the outside plate 22 of the door 20. However, the door knob 40 is only for illustrative purposes, and the present invention is not limited thereto. For example, the door knob 40 may be installed on the inside plate 21 of the door 20, and only a hole into which a key is inserted, instead of the door knob 40, may be formed in the outside plate 22 of the door 20.

The reinforcing plate 50 is a rectangular steel plate, and includes through holes 51 through which the latch elements 32 move in and out. The reinforcing plate 50 covers the side surface of the case 31 to be fixed to the door 20. The through holes 51 have a sufficient size so that the latch elements 32 can pass through the through holes 51. The number of the through holes 51 is the same as the number of the latch elements 32 of the locking element 30. The reinforcing plate 50 may have slightly greater vertical and horizontal lengths than those of the side surface of the case 31 so as to sufficiently cover the side surface of the case 31.

The reinforcing plate 50 may be formed of a harder material than the case 31. In particular, the reinforcing plate 50 may be formed of steel that is harder than mild steel used for forming the case 31. Since the reinforcing plate 50 is formed of steel, the reinforcing plate 50 can reinforce the case 31. Four rivet holes 52 are formed in each of upper and lower portions of the reinforcing plate 50. The number of the rivet holes 52 is not limited to four, and may be changed according to a user's need.

The reinforcing plate 50 and a side surface of the door 20 are joined by rivets 60 that are inserted into the rivet holes 52. In the current embodiment, the rivets 60 are used since the reinforcing plate 50 can be strongly coupled to the door 20 by eliminating a gap between the reinforcing plate 50 and the door 20. Of course, the reinforcing plate 50 and the door 20 may be coupled using bolts and nuts. However, a gap can be formed between the reinforcing plate 50 and the door 20 due to gaps between screw threads of the bolts. Thus, this method is disadvantageous compared to the method of using the rivets 60 in terms of the overall strength of the door 20 due to the gap.

The door unit 10 having the above-described structure has the following advantages.

First, the reinforcing plate 50 is disposed so that the latch elements 32 that move in

and out can cover the side surface of the case 31 of the locking element 30. The reinforcing plate 50 and the door 20 are fixed by inserting the rivets 60 into the rivet holes 52 that are formed in the reinforcing plate 50.

Then, after the installation is completed, an interval D between the door 20 and the door frame 11 is significantly narrowed due to the reinforcing plate 50. Accordingly, a burglar cannot insert a pincer between the door 20 and the door frame 11.

In addition, even though a burglar inserts a pincer between the door 20 and the door frame 11 , the door 20 cannot be easily opened since the reinforcing plate 50 protects the side surface of the door 20 and the side surface of the case 31 is coupled to the side surface of the door 20. In particular, the reinforcing plate 50 is strongly coupled to the door 20 by the rivets 60, thereby increasing the overall strength of the door 20. Thus, the door 20 cannot be easily destroyed. Accordingly, if the reinforcing plate 50 has high strength, or the reinforcing plate 50 is completely installed so as to eliminate the gap between the door 20 and doorframe 11 , it is impossible to destroy the door 20 by using a pincer. In addition, even though the reinforcing plate 50 is slightly weak, or the reinforcing plate 50 is not completely installed such that there is a gap between the door 20 and the door frame 11 , it takes a longer period of time to insert a pincer between the door 20 and the door frame 11 that in the conventional art. In addition, even though a pincer is inserted between the door 20 and the doorframe 11 , it takes a long period of time to open the door 20 since the overall strength of the door 20 is reinforced. That is, it takes a long period of time for a burglar to open the door 20, so that the burglar can be easily caught in the act of opening the door 20.

FIG. 6 illustrates a door unit 10 according to anther embodiment of the present invention. A reinforcing plate 50 further includes an inside plate contact portion 53 in contact with an inside plate 21 of a door 20, and thus has a " ^~ i " shape. As illustrated in FIG. 6, the inside plate contact portion 53 is fixed to the door 20 by rivets 60 that are inserted in upper and lower portion of the reinforcing plate 50. In particular, the inside plate contact portion 53 is fixed to the inside plate 21 of the door 20. When the reinforcing plate 50 is bent in a " ^~ i " shape, the door 20 cannot be easily opened even though a pincer is inserted from the outside (i.e., in an "A" direction) of the door 20 in order to open the door 20. In particular, the door unit 10 of FIG. 6 can sufficiently withstand the bending force of a pincer compared to the door unit 10 having no

bent portion, which is illustrated in FIG. 4. That is, the bent portion has a predetermined strength so as to withstand the bending force, and thus a burglar cannot easily open the door 20.

FIG. 7 and 8 each illustrate a door unit 10, according to embodiments of the present invention.

In a reinforcing plate 50, a via hole 54 is formed in an inside plate contact portion 53, and a rotation axis that is installed at the door knob 40 to be connected to the latch elements 32 passing through the via hole 54. In FIG. 5, the inside plate contact portion 53 does not extend toward the door knob 40. However, in the current embodiment, the inside plate contact portion 53 extents toward the door knob 40. Accordingly, the door unit 10 is fixed to the door 20 by rivets 60 that are inserted in upper and lower portions of the reinforcing plate 50, and is coupled to the door 20 by the door knob 40 as well.

The inside plate contact portion 53 is strongly coupled to the door 20. Thus, even though a pincer is used for opening the door 20, the reinforcing plate 50 can be sufficiently well supported, thereby preventing the door 20 from being easily opened.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made as follows.

First, in the above embodiments of the present invention, the reinforcing plate 50 is in contact with only the lateral plate 23 and inside plate 21 of the door 20. However, the reinforcing plate 50 may be in contact with both the lateral plate 23 and outside plate 22 of the door 20, or alternatively, may be coupled to the lateral plate 23, outside plate 22 and inside plate 21 of the door 20.

Second, in the above embodiments of the present invention, the reinforcing plate 50 is composed of a plate member. However, a plurality of stacked plate members may constitute the reinforcing plate 50. In this case, the stacked plate members constituting the reinforcing plate 50 may be fixed by the rivets 60, or alternatively, may be coupled using a coupling element such as a bolt or the like.