# US 8,739,367 B2 · Hidden door hinge

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- Number: US 8,739,367 B2
- Document ID: US8739367B2
- Status: Granted
- Kind: B2
- Application number: 13/636,675
- Filed: 2011-03-22
- Published: 2013-01-17
- Granted: 2014-06-03
- Earliest claimed: 2010-03-22
- Applicants: Jang-Ho Park
- Inventors: Jang-Ho Park
- Web page: https://patentgrep.com/patent/US8739367B2

## CPC

- E05D 5/06: Bent flaps
- E05D 7/0423: {Screw-and-nut mechanisms (E05D7/0407, E05D7/043 take precedence)}
- E05D 2005/067: {gooseneck shaped}
- E05Y 2600/41: Concealed
- E05Y 2900/132: Doors
- E05D: HINGES OR SUSPENSION DEVICES FOR DOORS, WINDOWS OR WINGS (pivotal connections in general F16C11/00)
- E05Y: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF

## Abstract

In accordance with the disclosure, in various door constructions, a projection of a door leaf is inserted in a hollow of a doorframe, height of the door leaf is minutely adjusted, and an interval between the door leaf and the doorframe is adjusted, which results in easy fastening of the door leaf and the doorframe and reduced construction time. In addition, the door leaf is completely fastened to the doorframe through the locking mechanism, the door leaf is prevented from being twisted in long use, thereby increasing its durability.

## Claims

### Claim 1

A hidden door hinge comprising:
a fixing piece having a ‘C’ shaped bent structure and being fixed to a hinge installation part of a doorframe;
a rotating piece comprising a hollow on one end and an axial pin connecting piece on another end, an axial pin connected to said connecting piece and serving as a rotating support axis, the rotating piece is inserted into the ‘C’ shaped bent structure and pivotally connected thereto by said axial pin of the fixing piece; and
a ‘L’ shaped door leaf connecting fastener having a connector joined to the door leaf and a projection extending therefrom and being inserted into and adjustably connected to the hollow of the rotating piece,
wherein the hollow of the rotating piece is an opening extending in a vertical direction, two first adjustors are adjustably connected to respective upper and lower ends of said hollow to engage said projection, and the vertical position of the projection relative to the hollow is adjusted by said first adjustors, such that the height of the door leaf is adjusted, wherein
the rotating piece comprises a first bent portion, which is a short bent portion in which the axial pin is located, and a second bent portion, which is a long bent portion in which the hollow is formed, and wherein
a through hole is formed in which the axial pin is inserted in the connecting piece, and a threaded through hole is formed in the middle of a sidewall of the second bent portion, and a bolt is threadably engaged with said threaded through hole for fastening the projection inserted in the hollow.

### Claim 2 (depends on 1)

The hidden door hinge of claim 1, wherein the first adjustors comprise first screw holes formed in respective upper wall and a lower wall of said second bent section, a bolt is threadably engaged with each screw hole to engage the projection for adjusting the vertical position of the projection.

### Claim 3 (depends on 2)

The hidden door hinge of claim 2, wherein the projection vertically extends from a first side of the connector, and grooves are formed in the projection to receive the bolts.

### Claim 4 (depends on 3)

The hidden door hinge of claim 3, further comprising:
a second adjustor located in a rear wall of said second bent portion opposite to the opening of the hollow, the second adjustor being provided to adjust horizontal movement of the door leaf by adjusting horizontal movement of the projection.

### Claim 5 (depends on 4)

The hidden door hinge of claim 4, wherein the second adjustor comprises:
a second screw hole formed in the rear wall of the second bent portion; and
a second bolt connected to the second screw hole to adjust the horizontal movement of the door leaf.

### Claim 6 (depends on 2)

The hidden door hinge of claim 2, wherein each of the bolts comprises a polygonal shaped groove formed at a top surface thereof and has a base.

### Claim 7 (depends on 2)

The hidden door hinge of claim 2, wherein the bolts are wrench-typed polygonal bolts having a base.

### Claim 8 (depends on 1)

The hidden door hinge of claim 1, wherein a top end and a bottom end of the C-shaped bent structure of the fixing piece comprise a flange, and an edge of each flange diagonally opposing the axial pin is beveled.