US 12,116,826 B2
Door hinge with damping function
June Young Lee, Busan (KR); and Dong Wook Kim, Busan (KR)
Assigned to SEO WON KOREA CO., LTD., (KR)
Filed by SEO WON KOREA CO., LTD, Gimhae-si (KR)
Filed on May 30, 2023, as Appl. No. 18/203,194.
Application 18/203,194 is a continuation of application No. PCT/KR2022/004874, filed on Apr. 5, 2022.
Claims priority of application No. 10-2021-0065881 (KR), filed on May 24, 2021.
Prior Publication US 2023/0295968 A1, Sep. 21, 2023
Int. Cl. E05F 3/20 (2006.01); E05D 11/08 (2006.01)
CPC E05F 3/20 (2013.01) [E05D 11/081 (2013.01); E05Y 2201/254 (2013.01); E05Y 2201/474 (2013.01); E05Y 2201/638 (2013.01)] 3 Claims
OG exemplary drawing
 
1. A door hinge for rotatably supporting a door so that the door performs an opening and closing operation, the door hinge comprising:
a housing installed on the door, the housing comprising a space with an open side and a housing cap inserted into the open side;
a main spring provided in the space of the housing;
a damper unit configured to be elastically supported by the main spring, the damper unit comprising a bottom body having a first flow path formed at a center portion thereof, a top body inserted into the bottom body and having a second flow path formed at an outer peripheral portion thereof and a third flow path formed at a center portion thereof, and a checker having a plurality of openings, provided in the bottom body to be movable between the top body and the bottom body, and configured to block the third flow path when being moved to the top body;
a shaft protruding from the side of the housing through the housing cap and configured to be rotated when the door is opened and closed; and
a cam unit provided between the shaft and the damper unit, the cam unit comprising a top cam configured to be rotated in close contact with the shaft and having a first inclined surface formed at a bottom portion thereof, and a bottom cam having a second inclined surface formed at a top portion thereof and in contact with the first inclined surface;
wherein the bottom body further comprises:
a receiving portion into which the top body is inserted;
a recess formed under the receiving portion and having the checker provided therein; and
a cross flow path formed on a bottom surface of the recess and configured to guide a movement of oil to the first flow path, and
wherein when the door is opened, the checker is pushed upward to form a space between the checker and the bottom surface of the recess, so that the oil moved to the openings of the checker is moved to the first flow path through the cross flow path.