Importance

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Abstract

A pivot hinge for supporting the top end of a door has a door closing device which is readily attached to, and removed from, the pivot hinge. A pivot shaft is fixed by a screw to a seat plate to be secured to a door frame and a door supporting plate is pivoted on the lower end portion of the pivot shaft. The door closing device includes a housing, an annular member contained in the housing and a coil spring contained in the housing. Opposite ends of the coil spring are connected to the housing and the annular member. In attaching the door closing device to the pivot hinge, the top end of the housing is non-rotatably connected to the door supporting plate by engagement of axial grooves and axial ridges formed on both of them, while the annular member is non-rotatably connected to the lower end portion of the pivot shaft by engagement of axial grooves and axial ridges formed on both of them, so that the coil spring is twisted by door opening to generate door closing torque. In order to prevent the door closing device from falling out automatically from the pivot hinge, a supporting disk is disposed on the door supporting plate and has radial projections which are fitted in the axial grooves of the housing. The housing has an annular groove intersecting the axial grooves with which the radial projections engage by rotation of the supporting disk.

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First Claim