Patent ID: 9435103
Filing Date: 2016-09-06
CPC Classification: B60J,B66C,E02F,E05D,E05F,E05Y,Y10T

Claim Text:
1. A semi-automatic door closing apparatus for a construction machine having a door openably and closably mounted on an operator's cab, the apparatus comprising: an upper hinge configured to be mounted on the door, the upper hinge having a first seating hole formed therein and a first rotation prevention member formed on an underside thereof; an upper sleeve having a second rotation prevention member formed on a top surface thereof, which is in close contact with the underside of the upper hinge to prevent idling of the upper sleeve during the opening and closing of the door, a first plane formed on an underside thereof, a first inclined surface formed on the underside thereof so as to extend directly from the first plane, and a first vertical surface to which the first inclined surface extends directly to, the first vertical surface extends from the first inclined surface to the first plane in a direction perpendicular to the first plane, the upper sleeve being penetratingly formed internally; a lower hinge configured to be mounted on the cab so as to perform a relative rotation with respect to the upper hinge, the lower hinge having a second seating hole formed therein and a third rotation prevention member formed on a top surface thereof; a lower sleeve having a fourth rotation prevention member formed on an underside thereof, which is in close contact with the top surface of the lower hinge to prevent idling of the lower sleeve during the opening and closing of the door, a second plane formed on a top surface thereof, a second inclined surface formed on the top surface thereof so as to extend directly from the second plane, and a second vertical surface to which the second inclined surface extends directly to, the second vertical surface extends from the second inclined surface to the second plane in a direction perpendicular to the second plane, the lower sleeve being penetratingly formed internally; and a guide pin having an upper end coupled to the first seating hole of the upper hinge so as to penetrate through the upper sleeve and a lower end coupled to the second seating hole of the lower hinge so as to penetrate through the lower sleeve; wherein when an external force applied to the door is removed after opening the door in a state where the lower hinge is securely fixed to the cab and the upper hinge is mounted on the door, the first inclined surface of the upper sleeve is rotated to slide along the second inclined surface of the lower sleeve by the door's own weight, so that the door is semi-automatically closed in a preset section; and wherein a width of the first plane of the upper sleeve is formed to be relatively smaller than a width of the second plane of the lower sleeve, and an inclination angle of a closed section in which the door is semi-automatically closed is variably adjusted depending on the adjustment of the width of the second plane.