Balanced door closing apparatus
AssigneeC. J. Rush A Division Of Derlan Manufacturing Inc.
InventorsHorst J. Appelmann, Edmund Dee
Life of this patent
Estimating the term…
Abstract
A door closer is shown, which is installed between a door and a door frame, in a balanced door. The door closer is installed in a header of the door frame, and includes an operative connection to a hinge shaft upon which upper and lower door support arms pivot. The operative connection includes a first gear mounted on a check shaft which engages a second gear mounted on the hinge shaft. The second gear preferably has a larger effective diameter than the first gear whereby the limited rotation of the hinge shaft results in a greater rotation of the check shaft to fully utilize the closer functions.
Claims10
A door closing apparatus for use in association with a balanced door having a door frame comprising a header, a base, and a pair of side jambs to define the door opening, one of said jambs having a hinge shaft disposed therein, and a door mounted in said door opening on an upper door pivot arm and a lower door pivot arm extending from said hinge shaft, said door having at least one guide roller guided by said frame, said door closing apparatus being mounted between the door and the frame, and comprising:
- a door closer body having an operative element extending from one end of said body;
- a first gear means having a first effective diameter connected to said operative element;
- and
- a second gear means having a second effective diameter mounted on an end of said hinge shaft;
- wherein said door closer body is mounted adjacent said hinge shaft and said first gear means engages said second gear means to operatively connect said door closer to said door.
Dependencies are inferred from the claim text.