Planetary gearbox system
AssigneeAlpine Overhead Doors, Inc.
InventorSebastian Magro
Life of this patent
Estimating the term…
Abstract
A fire door operator for a rolling door includes a housing defining an axis. An outer main gear in the form of an annular ring is mounted within the housing for rotation about the axis and formed with exterior gear teeth and radially inwardly spaced interior teeth. Planet gears are meshed with the interior teeth and a sun gear is meshed with the planet gears for rotation about the axis. A carrier is secured to the planetary gears and coupled to the shaft. A lock normally locks the main gear in relation to the housing. A drive selectively rotates the sun gear and the carrier to transmit rotational power to a rolling door shaft when secured to the carrier. A releasing device selectively releases the lock to allow free rotation of the main gear and the carrier to allow a rolling door to be lowered under its own weight.
Claims14
A fire door operator for a rolling door that can be raised when rolled onto a generally horizontal rotational rolling door shaft when the rotational rolling door shaft rotates in a first direction and lowered when the rotational rolling door shaft rotates in an opposing second direction, said operator comprising a stationary housing defining an axis;
- an outer main gear, wherein the outer main gear is an annular ring mounted within said housing for rotation about said axis and formed with exterior gear teeth and radially inwardly spaced interior gear teeth;
- speed control means coupled to said exterior gear teeth for controlling a rotational speed of said outer main gear;
- planetary gears meshed with said interior gear teeth;
- a sun gear comprising a first set of teeth that mesh with said planetary gears for rotation about said axis and a second set of teeth;
- a carrier secured to said planetary gears and coupled to said rotational rolling door shaft;
- locking means configured to lock said outer main gear in relation to said housing, preventing rotation of said outer main gear in the first direction and the second direction;
- a drive means coupled to said second set of teeth for selectively rotating said sun gear and said carrier to transmit rotational power to said rotational rolling door shaft;
- and releasing means for selectively releasing said locking means to allow free rotation of said outer main gear in relation to said housing to allow said rolling door to be lowered under its own weight, said outer main gear being driven directly by said planetary gears only when said locking means is released by said releasing means.
Dependencies are inferred from the claim text.