Patent ID: 7731158
Filing Date: 2010-06-08
Classification: B66D

Abstract:
1. An insert type chain hoist to enable a user to roll or unroll a rolling door manually, comprising a base, a transmission disc and a driving disc, wherein: the base disc includes a pivotal pillar extending from a central position of a lateral surface of the base disc, a driver and a clutch installed on another side of the base disc and away from the pivotal pillar, a manual device installed on the base disc, and a chain hoist drive wheel coupled with the manual device and on the same surface of the base disc wherein the transmission disc is disposed on a side of the base disc, and the transmission disc includes a primary gear disc, and the central position of the primary gear disc is pivotally coupled to the pivotal pillar of the base disc, and a first primary gear and a second primary gear are installed on both sides of the periphery of the primary gear disc respectively, and the first primary gear is driven by the driver to rotate the primary gear disc on the pivotal pillar, and the transmission disc includes a secondary gear disc coupled to the external periphery of the primary gear disc, and the secondary gear disc includes a first driven gear and a second driven gear installed on both surfaces of the periphery of the secondary gear disc respectively, such that the first driven gear and the chain hoist drive wheel are engaged with each other, and the second driven gear and the second primary gear form an interval apart, and the periphery of the secondary gear disc is positioned by the clutch to fix the secondary gear disc at the positioning portion of the base disc the driving disc is disposed on another side of the transmission disc and away from the base disc, and the driving disc includes a plurality of driving gears installed around a surface of the driving disc, and each driving gear is installed between the second driven gear and the second primary gear and engaged with the second driven gear and the second primary gear.