DOOR CLOSING DEVICE WITH MULTI-RATIO RACK AND PINION
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United States of America Patent
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Issued Date -
Sep 6, 2018
app pub date -
Feb 28, 2018
filing date -
Feb 28, 2018
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Abstract
A door-closing device connectable by a linkage assembly between a door and a door frame includes a piston linearly movable between a door-open position and a door-closed position toward which the piston is biased. The piston has first and second sets of rack teeth disposed thereon. A pinion gear is mounted on a rotatable shaft coupled to the linkage assembly, the pinion gear having a first set of gear teeth along a first circumferential portion for engagement with the first set of rack teeth, and a second set of gear teeth along a second circumferential portion for engagement with the second set of rack teeth, the engagement between the first set of pinion gear teeth and the first set of rack teeth providing a first gear ratio, and the engagement of the second set of pinion gear teeth with the second set of rack teeth providing a second gear ratio.
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